CN116394553A - Equipment and method for enhancing interlayer binding force of polytetrafluoroethylene microporous membrane - Google Patents
Equipment and method for enhancing interlayer binding force of polytetrafluoroethylene microporous membrane Download PDFInfo
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- CN116394553A CN116394553A CN202310104318.3A CN202310104318A CN116394553A CN 116394553 A CN116394553 A CN 116394553A CN 202310104318 A CN202310104318 A CN 202310104318A CN 116394553 A CN116394553 A CN 116394553A
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- -1 polytetrafluoroethylene Polymers 0.000 title claims abstract description 46
- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 46
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 46
- 239000011229 interlayer Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000002708 enhancing effect Effects 0.000 title claims abstract description 22
- 239000012982 microporous membrane Substances 0.000 title claims description 31
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 148
- 239000007788 liquid Substances 0.000 claims abstract description 107
- 238000010791 quenching Methods 0.000 claims abstract description 81
- 230000000171 quenching effect Effects 0.000 claims abstract description 80
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 74
- 238000010438 heat treatment Methods 0.000 claims abstract description 68
- 238000003860 storage Methods 0.000 claims abstract description 20
- 238000011084 recovery Methods 0.000 claims abstract description 19
- 238000007493 shaping process Methods 0.000 claims description 149
- 238000004891 communication Methods 0.000 claims description 26
- 238000001816 cooling Methods 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 238000009998 heat setting Methods 0.000 claims description 6
- 238000003490 calendering Methods 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 claims description 5
- 239000010687 lubricating oil Substances 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 238000013459 approach Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000012528 membrane Substances 0.000 abstract description 24
- 238000005086 pumping Methods 0.000 abstract description 10
- 238000002360 preparation method Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 description 14
- 238000007664 blowing Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 2
- 239000011265 semifinished product Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000502 dialysis Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000012229 microporous material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/02—Thermal after-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/02—Thermal after-treatment
- B29C2071/025—Quenching, i.e. rapid cooling of an object
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention relates to the field of polytetrafluoroethylene membrane preparation, in particular to equipment and a method for enhancing interlayer binding force of polytetrafluoroethylene microporous membranes, which comprise a first traction roller and a second traction roller, wherein a quenching tank is arranged between the first traction roller and the second traction roller, a first cylinder is fixed on the outer wall of a top plate of the quenching tank, a first telescopic rod of the first cylinder penetrates through the top plate and stretches into the quenching tank, a heating plate is fixed at the end part of the first telescopic rod, through grooves are formed in the left side plate and the right side plate of the quenching tank, a first air bag is fixed on the bottom surface of each through groove, a gap is reserved at the top of each first air bag from the top of each through groove, a liquid nitrogen storage tank is fixed at the bottom of the quenching tank and communicated with the quenching tank through a first communicating pipe, a first liquid pumping pump is arranged on the first communicating pipe, a liquid nitrogen recovery tank is fixed at the bottom of the quenching tank and communicated with the quenching tank through a second communicating pipe, a second liquid pumping pump is arranged on the second communicating pipe, and the interlayer binding force is greatly improved.
Description
Technical Field
The invention relates to the field of polytetrafluoroethylene membrane preparation, in particular to equipment and a method for enhancing interlayer binding force of polytetrafluoroethylene microporous membranes.
Background
The polytetrafluoroethylene microporous membrane is a porous product obtained by extruding polytetrafluoroethylene into a rod or a belt, calendaring the rod or the belt into a semi-finished product of a film, and stretching and heat setting the semi-finished product at a temperature below the melting point. A flexible elastic microporous material of polytetrafluoroethylene has high porosity, uniform pore size distribution and air and water permeability, can be used as a sterilizing filter membrane, an electrolytic membrane, a gas dialysis membrane, an ultra-clean filter membrane of various solvents and the like, and can be adhered to fabrics to be used as mountain climbing clothing, an air permeable tent, a raincoat and the like, so that the application of the polytetrafluoroethylene microporous membrane is more and more widely spread.
However, in the prior art, the preparation of the polytetrafluoroethylene microporous membrane is completed only after one heat setting, for example, the patent with the application number of CN201310484329.5 discloses a preparation process of the polytetrafluoroethylene microporous membrane, which mainly comprises the following process steps: the polytetrafluoroethylene dispersion resin and the lubricating oil are uniformly mixed, pressed into a compact, extruded, rolled, dried, longitudinally stretched, transversely stretched, heat-set treatment with a melting point higher than that and cooled to room temperature for winding, the process is just one heat-set, no post-treatment process is carried out on the membrane, the prepared polytetrafluoroethylene microporous membrane generally has unstable structure, that is, once the prepared polytetrafluoroethylene microporous membrane is subjected to external force (such as impact force of water, mechanical traction force and the like) in the use process, layering and even tearing are easy to occur, unnecessary troubles are caused in the use process, the service life of the membrane is finally greatly shortened, and in addition, equipment capable of enhancing the interlayer binding force of the polytetrafluoroethylene microporous membrane is not available in the prior art, so that the equipment for enhancing the interlayer binding force of the polytetrafluoroethylene microporous membrane and the specific process using the equipment are needed.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention aims to provide equipment and a method for enhancing the interlayer binding force of a polytetrafluoroethylene microporous membrane, which solve the problems in the prior art, the equipment for enhancing the interlayer binding force of the polytetrafluoroethylene microporous membrane is used for carrying out a membrane post-treatment process on a primary shaping membrane, and the process of heating and cooling the membrane after the primary shaping is equal to the process of carrying out secondary shaping on the membrane, so that the interlayer binding force of the polytetrafluoroethylene microporous membrane is greatly increased, the structure of the polytetrafluoroethylene microporous membrane is more stable, the impact of external force can be resisted in the using process, and the service life and the using effect of the polytetrafluoroethylene microporous membrane are greatly improved.
(II) technical scheme
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides an equipment of reinforcing polytetrafluoroethylene microporous membrane interlayer cohesion, including first traction roller and second traction roller, be equipped with the quenching case between first traction roller and the second traction roller, be fixed with first cylinder on the roof outer wall of quenching case, the first telescopic link of first cylinder passes the roof and stretches into the inside of quenching case, the tip of first telescopic link is fixed with the hot plate, logical groove has all been seted up on the left side board and the right side board of quenching case, be fixed with first gasbag on the bottom surface of logical groove, the top of first gasbag leaves the clearance apart from the top of logical groove, the bottom of quenching case is fixed with the liquid nitrogen bin, the liquid nitrogen bin is equipped with the quenching case through first communicating pipe intercommunication, be equipped with first drawing liquid pump on the first communicating pipe, the bottom of quenching case is fixed with the liquid nitrogen recovery case, the liquid nitrogen recovery case is equipped with the quenching case through the second communicating pipe intercommunication, be equipped with the second drawing liquid pump on the second communicating pipe.
Preferably, the left side plate and the right side plate are respectively fixed with a mutually symmetrical supporting plate, the end parts of the two supporting plates are respectively fixed with a second air bag, a gap is reserved between the two second air bags, a second miniature inflator pump is fixed on the supporting plate, the second miniature inflator pump is communicated with the second air bags through second inflation pipes, the second air bags are communicated with second miniature suction pumps through second suction pipes, and the second miniature suction pumps are fixed on the supporting plates.
Preferably, the left side plate and the right side plate below the through groove are hollow, the second air cylinder is fixed in the left side plate and the right side plate below the through groove, the second air cylinder is arranged on the inner side of the first air bag, the fan is fixed at the end part of the second telescopic rod of the second air cylinder, the left side plate or the right side plate below the through groove comprises a top plate, an outer side plate, an inner side plate and a bottom plate, the top plate comprises a fixing plate fixed with the first air bag and a movable plate spliced with the fixing plate, and the inner end of the movable plate is hinged with the inner side plate.
Preferably, the bottom of the heating plate is provided with a wave shape, and a plurality of communicating grooves are formed between the upper wave crest of the wave-shaped heating plate and the top of the heating plate.
Preferably, the first air bag is communicated with a first micro air pump through a first air inflation pipe, the first micro air pump is fixed on the outer wall surface of the left side plate or the right side plate, the first micro air suction pump is also fixed on the outer wall surfaces of the left side plate and the right side plate, and the first air bag is communicated with the first micro air suction pump through a first air suction pipe.
Preferably, the liquid nitrogen bin is provided with two, and it is fixed respectively in the left and right sides of quenching bottom of the case portion, is fixed with the liquid nitrogen collection box between two liquid nitrogen bins, and two liquid nitrogen bins have the quenching case through first communication pipe intercommunication respectively, and first communication pipe sets up to outside upward slope, and the inboard of its upper end opening part is fixed with the one end of baffle, and the other end of baffle is fixed with the upper end of second communicating pipe, and the lower extreme of second communicating pipe stretches into in the liquid nitrogen collection box.
Preferably, the baffle plate gradually inclines downwards from outside to inside.
Preferably, a collecting box is arranged on the outer side of the liquid nitrogen storage box, and the collecting box is communicated with the quenching box through a communication channel.
Preferably, a method for enhancing interlayer binding force of polytetrafluoroethylene microporous membrane relates to the device as claimed in any one of claims 1 to 8, and comprises the following specific steps: s1, uniformly mixing polytetrafluoroethylene dispersion resin with lubricating oil, compacting, extruding, calendaring, drying, longitudinally stretching, transversely stretching, performing heat setting treatment above a melting point, and cooling to room temperature to obtain a primary setting film A; s2, the primary shaping film A is pulled into a quenching box through a first pull roll and a second pull roll; s3, starting a second micro inflator pump to enable the second air bags to be inflated and expanded, and further clamping the primary shaping film A between the two second air bags; s4, a first air cylinder and a heating plate are started simultaneously, wherein a first telescopic rod of the first air cylinder stretches to drive the heating plate to move downwards until the heating plate approaches to a primary shaping film A in a quenching box, at the moment, the first air cylinder stops running, the heating plate starts to heat the primary shaping film A below the heating plate to a preset time, a fan and a first micro suction pump are started while heating the primary shaping film A, the fan blows air to the primary shaping film A above the fan, and the first micro suction pump sucks air from the first air bag, so that the first air bag is slowly contracted; s5, after heating is finished, the first air cylinder is restarted, the telescopic rod of the first air cylinder contracts to drive the heating plate to move upwards and far away from the primary shaping film A, the first air cylinder stops running until the heating plate is driven to an original position, the first air cylinder is started while the first liquid pump, the second air cylinder and the first micro air pump are started simultaneously, the first liquid pump pumps liquid nitrogen stored in the liquid nitrogen storage box into the first communication pipe, then the liquid nitrogen enters a gap between the baffle and the primary shaping film A, the primary shaping film A is rapidly cooled, the second liquid pump is started, liquid nitrogen between the baffle and the primary shaping film A is pumped into the liquid nitrogen recovery box to be recovered, the second air cylinder is started to enable the second telescopic rod to contract, the second telescopic rod contracts to drive the fan to enter the left side plate or the right side plate downwards, meanwhile, the movable plate is closed, the first micro air pump is started, and the first air pump is inflated into the first air bag until the top of the first air bag is completely propped against the top of the through groove; s6, after the primary shaping film A is cooled, the first liquid suction pump stops working, the first micro air suction pump and the second micro air suction pump are started simultaneously, the first micro air suction pump pumps air from the first air bag, so that the first air bag is slowly contracted, the second micro air suction pump sucks air from the second air bag, a gap for the primary shaping film A to pass through is reserved between the two second air bags, then the first traction roller and the second traction roller are started, the processed primary shaping film A is pulled out of the quenching box, the primary shaping film A to be processed is pulled into the quenching box, and the steps are repeated in a circulating way; and S7, airing or drying the primary shaping film A treated by the quenching box.
(III) beneficial effects
1. According to the invention, the membrane subjected to primary shaping is subjected to secondary shaping through the equipment for enhancing the interlayer binding force of the polytetrafluoroethylene microporous membrane, and compared with the common primary shaping membrane, the interlayer binding force of the membrane subjected to secondary shaping is greatly improved, the membrane is stable in structure in the use process, the layering condition is avoided, the quality of the membrane is greatly improved, and the service life of the membrane is greatly prolonged;
2. according to the invention, the first air bag is arranged at the through groove, the top ends of the first traction roller and the second traction roller are lower than the top end of the first air bag, so that the section from the first traction roller or the second traction roller to the first air bag of the primary shaping film A is gradually raised, when the first air bag is deflated by air suction, the situation that the junction between the heated part and the unheated part of the primary shaping film A is stretched due to tight stretching in the heating process of the primary shaping film A is avoided, meanwhile, the first air bag also has a sealing effect, and the whole through groove can be sealed after the first air bag is inflated, so that liquid nitrogen in the quenching box can not leak outwards through the through groove;
3. according to the invention, the primary shaping film A can be well clamped by the arrangement of the support plate, the second air bag and the like, the primary shaping film A is not damaged by the air bag, the clamping effect is good, once the two ends of the primary shaping film A are clamped, the primary shaping film A is well fixed, and therefore, after the first air bag is pumped, the primary shaping film A is in a loose state and is not wound back by the first traction roller and the second traction roller;
4. according to the invention, the air blowing is carried out on the junction of the heated part and the unheated part of the primary shaping film A through the arrangement of the fan, so that the softened primary shaping film A is prevented from falling downwards, and further the fracture of the junction is prevented;
5. the bottom of the heating plate is wavy, so that more heat is transferred compared with a heating plate with a flat bottom, the heating effect and the heating efficiency are higher, part of hot air can rise upwards through the communicating grooves through the arrangement of the communicating grooves, convection can be formed, the primary shaping film A softened by heating is supported upwards, the effect of upward blowing is equivalent, and the situation that the primary shaping film A softened by heating falls down and slumps is avoided;
6. according to the invention, the liquid nitrogen storage tanks are arranged as two, the first communication pipes are arranged to incline outwards and the baffle plates are arranged, so that on one hand, the junction of the heated part and the unheated part of the primary shaping film A in the quenching tank can be cooled in advance, and the part is the weakest part, and is cooled at the first time best, so that the integrity of the quenching tank is ensured; meanwhile, the liquid nitrogen can rapidly cool the primary shaping film A through the arrangement of the baffle plate, so that the cooling efficiency is increased, the cooling effect is also increased, the interlayer binding force of the polytetrafluoroethylene microporous film is stronger as the primary shaping film A is cooled faster, the space between the baffle plate and the primary shaping film A can be narrowed through the arrangement of the baffle plate, the primary shaping film A can be cooled only by extracting a small amount of liquid nitrogen, the liquid nitrogen is saved while the cooling efficiency is high, the baffle plate is arranged to be gradually declined from outside to inside, the liquid nitrogen on two sides can flow to the middle rapidly, the good diversion effect is achieved, the primary shaping film A can be rapidly cooled, the interlayer binding force of the polytetrafluoroethylene microporous film is greatly enhanced, and meanwhile, the declined baffle plate can rapidly recycle the liquid nitrogen;
7. the invention not only completes the secondary shaping of the membrane after the primary shaping, but also well solves the problems existing in the secondary shaping, such as the problem of easy fracture at the cold-hot junction, such as the problem of clamping the primary shaping membrane, and the like, through a specific method for enhancing the interlayer binding force of the polytetrafluoroethylene microporous membrane.
Drawings
Fig. 1 is an overall cross-sectional view of the present invention.
Fig. 2 is an overall cross-sectional view of the present invention.
FIG. 3 is a schematic view of a support plate, a second bladder, a second micro inflator, a second inflation tube, a second suction tube, and a second micro aspirator according to the present invention.
Fig. 4 is a schematic view of a second cylinder, a second telescopic rod, a fan, a top plate, an outer plate, an inner plate, a bottom plate, a fixed plate and a movable plate according to the present invention.
Fig. 5 is a schematic view of a heating plate of the present invention.
Fig. 6 is an overall cross-sectional view of the present invention.
In the figure: 1-first traction roller, 2-second traction roller, 3-quenching tank, 4-top plate, 5-first cylinder, 6-first telescopic rod, 7-heating plate, 8-left side plate, 9-right side plate, 10-through groove, 11-first air bag, 12-liquid nitrogen storage tank, 13-first communication pipe, 14-first liquid pumping pump, 15-liquid nitrogen recovery tank, 16-second communication pipe, 17-second liquid pumping pump, 18-supporting plate, 19-second air bag, 20-second micro air pump, 21-second air pumping pipe, 22-second air suction pipe, 23-second micro air pumping pump, 24-second cylinder, 25-second telescopic rod, 26-fan, 27-top plate, 28-outer side plate, 29-inner side plate, 30-bottom plate, 31-fixed plate, 32-movable plate, 33-upper peak, 34-communication groove, 35-first air pumping pipe, 36-first micro air pumping pump, 37-first micro air pumping pump, 38-first air pumping pipe, 39-baffle plate, 40-collecting tank and 41-collecting channel.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 6 of the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a technical scheme that: the equipment for enhancing the interlayer binding force of the polytetrafluoroethylene microporous membrane comprises a first traction roller 1 and a second traction roller 2, wherein a quenching tank 3 is arranged between the first traction roller 1 and the second traction roller 2, a first air cylinder 5 is fixed on the outer wall of a top plate 4 of the quenching tank 3, a first telescopic rod 6 of the first air cylinder 5 penetrates through the top plate 4 to extend into the quenching tank 3, a heating plate 7 is fixed at the end part of the first telescopic rod 6, through grooves 10 are formed in a left side plate 8 and a right side plate 9 of the quenching tank 3, a first air bag 11 is fixed on the bottom surface of the through grooves 10, a gap is reserved between the top of the first air bag 11 and the top of the through grooves 10, a liquid nitrogen storage tank 12 is fixed at the bottom of the quenching tank 3, the liquid nitrogen storage tank 12 is communicated with the quenching tank 3 through a first communication pipe 13, a first liquid suction pump 14 is arranged on the first communication pipe 13, a liquid nitrogen recovery tank 15 is fixed at the bottom of the quenching tank 3, the liquid nitrogen recovery tank 15 is communicated with the quenching tank 3 through a second communicating pipe 16, a second liquid pump 17 is arranged on the second communicating pipe 16, the process of reheating and cooling the once-shaped film is performed through the arrangement of the quenching tank 3, namely, the twice-shaping is performed, so that the interlayer binding force of the polytetrafluoroethylene microporous film is enhanced, wherein the first traction roller 1 and the second traction roller 2 are used for traction of the once-shaped film A, the length, the time and the like of each traction are controlled by a control system, namely, when the once-shaped film A in the quenching tank 3 is completely drawn out of the quenching tank 3 after the twice-shaping is completed, the once-shaped film A which needs to be secondarily shaped next is equidistantly drawn into the quenching tank 3, namely, the connection can be performed, so that all the once-shaped films A can be secondarily shaped, and the like are controlled by the control system, it should be noted here that the heating plate 7 heats the primary shaping film a to a temperature close to its melting point, but not to the melting point, that is, to such an extent that the primary shaping film a is softened, and does not need to be melted; the primary shaping film A is heated by the heating plate 7, and the heating plate 7 can ascend and descend through the first air cylinder 5, so that the heating plate 7 can be close to the primary shaping film A below the primary shaping film A when the primary shaping film A is heated, the heating effect is good, the heating efficiency is high, and meanwhile, energy is saved, after the primary shaping film A is heated, the heating plate 7 is lifted by the first air cylinder 5 and is far away from the primary shaping film A, the heating plate 7 can be prevented from being soaked in the next liquid nitrogen cooling link, the heating plate 7 is damaged, and the heating plate 7 is well protected; wherein the through groove 10 is provided for the primary shaping film a to pass through the quenching box 3, the through groove 10 is provided with the first air bag 11, and it is required to say that under the normal state of the first air bag 11, a gap is left between the top of the first air bag 11 and the top of the through groove 10, the gap is a gap through which the primary shaping film a can pass, wherein the top heights of the first traction roller 1 and the second traction roller 2 are lower than the top height of the first air bag 11, so that the primary shaping film a is gradually lifted from the first traction roller 1 or the second traction roller 2 to the first air bag 11, when the first air bag 11 is deflated, the primary shaping film a is not stretched tightly in the heating process, the junction of the heated part and the unheated part of the primary shaping film a is stretched, because the primary shaping film a under the heating plate 7 is directly heated, the part outside the heating plate 7 is not directly heated, especially at the junction between the two parts, because of the suddenly changed temperature, if the junction is still in a tight state, the first air bag 11 is easily pulled and broken, the first air bag 11 is pumped to shrink the first air bag 11, the residual quantity of the first shaping film A in the original filling state of the first air bag 11 is just released in the shrinking process, the first shaping film A is not in a tight state and is in a loose state, the junction of the heated and unheated first shaping film A can be ensured not to be broken due to the difference of temperature between two sides and the difference of hardness, in addition, the first air bag 11 also has a sealing function, when the first liquid pump 14 pumps liquid nitrogen into the quenching tank 3, the first air bag 11 is re-inflated until the upper end of the first air bag 11 abuts against the top surface of the through groove 10, namely the whole through groove 10 is sealed, so that the liquid nitrogen in the quenching tank 3 cannot leak outwards through the through groove 10; the liquid nitrogen storage tank 12 stores liquid nitrogen, the stored liquid nitrogen is pumped up to the quenching tank 3 through the first liquid pump 14, then the primary shaping film A which is just heated is cooled, when the liquid level of the liquid nitrogen pumped to the quenching tank 3 reaches the position of the primary shaping film A, the primary shaping film A is cooled, the primary shaping mold A in the quenching tank 3 can be uniformly cooled in the cooling mode, because the upper liquid level of the liquid nitrogen reaches the primary shaping mold A in the quenching tank 3 at the same time, and after cooling is completed, the liquid nitrogen in the quenching tank 3 is pumped to the liquid nitrogen recovery tank 15 through the second liquid pump 17 for recovery.
The left side plate 8 and the right side plate 9 are respectively fixed with a support plate 18 which is symmetrical with each other, the end parts of the two support plates 18 are respectively fixed with a second air bag 19, a gap is reserved between the two second air bags 19, the support plates 18 are respectively fixed with a second micro air pump 20, the second micro air pumps 20 are communicated with the second air bags 19 through second air pipes 21, the second air bags 19 are communicated with second micro air pumps 23 through second air suction pipes 22, the second micro air pumps 23 are fixed on the support plates 18, the gap is reserved between the two second air bags 19, the gap is the gap through which a primary shaping film A can pass, after the primary shaping film A needing to be secondarily shaped is pulled into the quenching box 3, the second micro air pumps 20 are started, the second air bags 19 are inflated until the upper and lower second air bags 19 clamp the primary shaping film A, the primary shaping film A can be well clamped in the mode, the two ends of the shaping film A cannot be damaged in the mode through the air bags, the clamping effect is good, once the primary shaping film A is well clamped, and the primary shaping film A is well shaped after being pulled and the primary shaping film A is well coiled around the primary air bags 11, and is not pulled and is well fixed on the primary air-shaping roller 11 after the primary shaping film A is stretched and is stretched around the primary air roller.
The left side plate 8 and the right side plate 9 below the through groove 10 are hollow, the second air cylinder 24 is fixed in the two, the second air cylinder 24 is arranged on the inner side of the first air bag 11, the fan 26 is fixed at the end part of the second telescopic rod 25 of the second air cylinder 24, the left side plate 8 or the right side plate 9 below the through groove 10 comprises a top plate 27, an outer side plate 28, an inner side plate 29 and a bottom plate 30, the top plate 27 comprises a fixed plate 31 fixed with the first air bag 11 and a movable plate 32 spliced with the fixed plate 31, the inner end of the movable plate 32 is hinged with the inner side plate 29, the fan 26 is aligned with the junction of the heated part and the unheated part of the primary shaping film A in the quenching tank 3, the primary shaping film a on the inner side of the junction is softened by being heated, and the primary shaping film a on the outer side of the junction is relatively hard because the primary shaping film a is not directly heated, so that the softened primary shaping film a easily drops downwards from the junction, and the softened primary shaping film a is prevented from dropping downwards by blowing the junction through the fan 26, wherein the distance between the fan 26 and the junction and the speed of the fan 26 are adjusted to be optimal according to the actual situation, that is, the fan 26 can blow the primary shaping films a on two sides of the junction on the same horizontal plane, which is the optimal state; the fan 26 is fixed on the second telescopic rod 25 of the second air cylinder 24, and meanwhile, the fixed plate 31 and the movable plate 32 are arranged, so that the fan 26 can be lowered when the heated primary shaping film A is cooled, the fan is hidden in the left side plate 8 or the right side plate 9 below the through groove 10, and then the movable plate 32 is closed, so that the fan 26 is well protected and the service life of the fan 26 is prolonged due to the fact that the fan is prevented from being damaged by liquid nitrogen during cooling.
The bottom of hot plate 7 sets up to waved, a plurality of intercommunication grooves 34 have been seted up between the crest 33 of the upper crest of waved hot plate 7 and the top of hot plate 7, at first set up the bottom of hot plate 7 to waved, the heat that transmits is more for the flat hot plate 7 of bottom like this, the effect of heating and heating efficiency are higher, wherein can make partial steam rise through intercommunication groove 34 through the setting of intercommunication groove 34, can form the convection current like this, play the effect of upwards supporting by the primary shaping membrane A of heat softening, be equivalent to the effect of upwards blowing, avoid the circumstances that the primary shaping membrane A of heat softening falls down to collapse to appear.
The first air bag 11 is communicated with a first micro air pump 36 through a first air charging pipe 35, the first micro air pump 36 is fixed on the outer wall surface of the left side plate 8 or the right side plate 9, a first micro air suction pump 37 is also fixed on the outer wall surfaces of the left side plate 8 and the right side plate 9, and the first micro air suction pump 37 is communicated with the first air bag 11 through a first air suction pipe 38, so that how the first air bag 11 is inflated and pumped is realized.
The two liquid nitrogen storage tanks 12 are respectively fixed at the left side and the right side of the bottom of the quenching tank 3, a liquid nitrogen recovery tank 15 is fixed between the two liquid nitrogen storage tanks 12, the two liquid nitrogen storage tanks 12 are respectively communicated with the quenching tank 3 through a first communication pipe 13, the first communication pipe 13 is arranged to incline outwards and upwards, one end of a baffle 39 is fixed at the inner side of an opening at the upper end of the first communication pipe, the other end of the baffle 39 is fixed with the upper end of a second communication pipe 16, and the lower end of the second communication pipe 16 stretches into the liquid nitrogen recovery tank 15; meanwhile, the setting of the baffle 39 can enable liquid nitrogen to rapidly cool the primary shaping film A, so that the cooling efficiency is increased, the cooling effect is also increased, the faster the primary shaping film A is cooled, the stronger the interlayer binding force of the polytetrafluoroethylene microporous film is, the narrow space between the baffle 39 and the primary shaping film A can be formed by the setting of the baffle 39, and therefore, the primary shaping film A can be cooled by only extracting a small amount of liquid nitrogen, and the liquid nitrogen is also saved while the cooling efficiency is high.
Baffle 39 is gradually declined from outside to inside, wherein the baffle 39 is arranged to be gradually declined from outside to inside, so that liquid nitrogen on two sides can flow to the middle quickly, a good diversion effect is achieved, the primary shaping film A can be cooled quickly, the bonding force between polytetrafluoroethylene microporous membrane layers is further greatly enhanced, and meanwhile, the declined baffle 39 can be used for recovering liquid nitrogen quickly.
The outside of the liquid nitrogen storage box 12 is provided with a collecting box 40, the collecting box 40 is communicated with the quenching tank 3 through a communication channel 41, and liquid nitrogen entering the space between the left side plate 8 or the right side plate 9 below the through groove 10 and the first communication pipe 13 can be recovered through the arrangement of the collecting box 40.
A method for enhancing interlayer binding force of polytetrafluoroethylene microporous membrane, which relates to the device of any one of claims 1-8, and comprises the following specific steps: s1, uniformly mixing polytetrafluoroethylene dispersion resin with lubricating oil, compacting, extruding, calendaring, drying, longitudinally stretching, transversely stretching, heat setting treatment above a melting point and cooling to room temperature to obtain a primary setting film A, wherein the preparation of the primary setting film A belongs to the prior art, and the preparation process is disclosed in the patent with the application number of CN201310484329.5, so that the description is omitted herein; s2, the primary shaping film A is pulled into a quenching box 3 through a first pull roll 2 and a second pull roll 3; s3, starting a second micro inflator pump 20 to enable the second air bags 19 to be inflated, and further clamping the primary shaping film A between the two second air bags 19; s4, the first air cylinder 5 and the heating plate 7 are started at the same time, wherein a first telescopic rod 6 of the first air cylinder 5 stretches to drive the heating plate 7 to move downwards until the heating plate 7 approaches to a primary shaping film A in the quenching box 3, at the moment, the first air cylinder 5 stops running, the heating plate 7 starts to heat the primary shaping film A below the heating plate until the preset time, and the fan 26 and the first micro suction pump 37 are started while heating the primary shaping film A, wherein the fan 26 blows air to the primary shaping film A above the primary shaping film A, and the first micro suction pump 37 pumps air to the first air bag 11, so that the first air bag 11 is slowly contracted; s5, after heating is finished, the first air cylinder 5 is restarted, the telescopic rod 6 of the first air cylinder is contracted to drive the heating plate 7 to move upwards and far away from the primary shaping film A, the first air cylinder 5 stops running until the heating plate 7 is driven to an original position, the first air cylinder 5 is started and simultaneously the first liquid pump 14, the second liquid pump 17, the second air cylinder 24 and the first micro air pump 36 are started, wherein the first liquid pump 14 pumps liquid nitrogen stored in the liquid nitrogen storage tank 12 into the first communication pipe 3, then enters a gap between the baffle 39 and the primary shaping film A, rapidly cools the primary shaping film A, the second liquid pump 17 is started, liquid nitrogen between the baffle 39 and the primary shaping film A is pumped into the liquid nitrogen recovery tank 15 for recovery, the second air cylinder 24 is started to enable the second telescopic rod 25 to be contracted, the fan 26 to be driven downwards to enter the inner part of the left side plate 8 or the right side plate 9, and simultaneously the movable plate 32 is closed, the first micro air pump 36 is started, and the first air bag 11 is inflated until the top of the first air bag 11 is completely propped against the top of the through groove 10; s6, after the primary shaping film A is cooled, the first liquid suction pump 14 stops working, the first micro air suction pump 37 and the second micro air suction pump 23 are started simultaneously, the first micro air suction pump 37 pumps air from the first air bag 11 to enable the first air bag 11 to be gradually reduced, the second micro air suction pump 23 sucks air from the second air bag 19 to enable a gap for the primary shaping film A to pass through to be reserved between the two second air bags 19, then the first traction roller 1 and the second traction roller 2 are started, the processed primary shaping film A is pulled out of the quenching box 3, and the primary shaping film A to be processed is pulled into the quenching box 3, so that the primary shaping film A is circularly reciprocated; s7, the primary shaping film A processed by the quenching box 3 is dried or dried in a manner that a drying box is added on the right side of the quenching box 3, and the cooled primary shaping film A can be directly pulled into the drying box for drying.
To sum up: the primary shaping film A is equal to the secondary shaping after passing through the quenching box 3, and compared with the common primary shaping film, the interlayer binding force of the film after the secondary shaping is greatly improved, the structure is stable in the use process, layering is avoided, the quality is greatly improved, and the service life is greatly prolonged.
Working principle: the specific steps during working are as follows: s1, uniformly mixing polytetrafluoroethylene dispersion resin with lubricating oil, compacting, extruding, calendaring, drying, longitudinally stretching, transversely stretching, heat setting treatment above a melting point and cooling to room temperature to obtain a primary setting film A, wherein the preparation of the primary setting film A belongs to the prior art, and the preparation process is disclosed in the patent with the application number of CN201310484329.5, so that the description is omitted herein; s2, the primary shaping film A is pulled into a quenching box 3 through a first pull roll 2 and a second pull roll 3; s3, starting a second micro inflator pump 20 to enable the second air bags 19 to be inflated, and further clamping the primary shaping film A between the two second air bags 19; s4, the first air cylinder 5 and the heating plate 7 are started at the same time, wherein a first telescopic rod 6 of the first air cylinder 5 stretches to drive the heating plate 7 to move downwards until the heating plate 7 approaches to a primary shaping film A in the quenching box 3, at the moment, the first air cylinder 5 stops running, the heating plate 7 starts to heat the primary shaping film A below the heating plate until the preset time, and the fan 26 and the first micro suction pump 37 are started while heating the primary shaping film A, wherein the fan 26 blows air to the primary shaping film A above the primary shaping film A, and the first micro suction pump 37 pumps air to the first air bag 11, so that the first air bag 11 is slowly contracted; s5, after heating is finished, the first air cylinder 5 is restarted, the telescopic rod 6 of the first air cylinder is contracted to drive the heating plate 7 to move upwards and far away from the primary shaping film A, the first air cylinder 5 stops running until the heating plate 7 is driven to an original position, the first air cylinder 5 is started and simultaneously the first liquid pump 14, the second liquid pump 17, the second air cylinder 24 and the first micro air pump 36 are started, wherein the first liquid pump 14 pumps liquid nitrogen stored in the liquid nitrogen storage tank 12 into the first communication pipe 3, then enters a gap between the baffle 39 and the primary shaping film A, rapidly cools the primary shaping film A, the second liquid pump 17 is started, liquid nitrogen between the baffle 39 and the primary shaping film A is pumped into the liquid nitrogen recovery tank 15 for recovery, the second air cylinder 24 is started to enable the second telescopic rod 25 to be contracted, the fan 26 to be driven downwards to enter the inner part of the left side plate 8 or the right side plate 9, and simultaneously the movable plate 32 is closed, the first micro air pump 36 is started, and the first air bag 11 is inflated until the top of the first air bag 11 is completely propped against the top of the through groove 10; s6, after the primary shaping film A is cooled, the first liquid suction pump 14 stops working, the first micro air suction pump 37 and the second micro air suction pump 23 are started simultaneously, the first micro air suction pump 37 pumps air from the first air bag 11 to enable the first air bag 11 to be gradually reduced, the second micro air suction pump 23 sucks air from the second air bag 19 to enable a gap for the primary shaping film A to pass through to be reserved between the two second air bags 19, then the first traction roller 1 and the second traction roller 2 are started, the processed primary shaping film A is pulled out of the quenching box 3, and the primary shaping film A to be processed is pulled into the quenching box 3, so that the primary shaping film A is circularly reciprocated; s7, the primary shaping film A processed by the quenching box 3 is dried or dried in a manner that a drying box is added on the right side of the quenching box 3, and the cooled primary shaping film A can be directly pulled into the drying box for drying.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The equipment for enhancing the interlayer binding force of the polytetrafluoroethylene microporous membrane is characterized by comprising a first traction roller (1) and a second traction roller (2), wherein a quenching tank (3) is arranged between the first traction roller (1) and the second traction roller (2), a first air cylinder (5) is fixed on the outer wall of a top plate (4) of the quenching tank (3), a first telescopic rod (6) of the first air cylinder (5) penetrates through the top plate (4) and stretches into the quenching tank (3), a heating plate (7) is fixed at the end part of the first telescopic rod (6), through grooves (10) are formed in a left side plate (8) and a right side plate (9) of the quenching tank (3), a first air bag (11) is fixed on the bottom surface of the through grooves (10), a liquid nitrogen storage tank (12) is fixed at the bottom of the quenching tank (3), a liquid nitrogen drawing tank (12) passes through the first connecting pipe (13) and is communicated with the quenching tank (15), a liquid nitrogen recovery tank (16) is fixed at the bottom of the quenching tank (3), the second communicating pipe (16) is provided with a second liquid pump (17).
2. The equipment for enhancing interlayer binding force of polytetrafluoroethylene microporous membrane according to claim 1, wherein the left side plate (8) and the right side plate (9) are both fixed with mutually symmetrical supporting plates (18), the end parts of the two supporting plates (18) are both fixed with second air bags (19), a gap is reserved between the two second air bags (19), a second micro inflator (20) is fixed on the supporting plates (18), the second micro inflator (20) is communicated with the second air bags (19) through a second inflation tube (21), the second air bags (19) are communicated with a second micro inflator (23) through a second air suction tube (22), and the second micro inflator (23) is fixed on the supporting plates (18).
3. The equipment for enhancing the interlayer binding force of the polytetrafluoroethylene microporous membrane according to claim 1, wherein the left side plate (8) and the right side plate (9) below the through groove (10) are both hollow, a second air cylinder (24) is fixed inside the left side plate and the right side plate, the second air cylinder (24) is arranged inside the first air bag (11), a fan (26) is fixed at the end part of a second telescopic rod (25) of the second air cylinder (24), the left side plate (8) or the right side plate (9) below the through groove (10) comprises a top plate (27), an outer side plate (28), an inner side plate (29) and a bottom plate (30), the top plate (27) comprises a fixed plate (31) fixed with the first air bag (11) and a movable plate (32) spliced with the fixed plate (31), and the inner end of the movable plate (32) is hinged with the inner side plate (29).
4. The equipment for enhancing interlayer binding force of polytetrafluoroethylene microporous membrane according to claim 1, wherein the bottom of the heating plate (7) is provided with waves, and a plurality of communication grooves (34) are formed between the upper wave crest (33) of the wave-shaped heating plate (7) and the top of the heating plate (7).
5. The equipment for enhancing interlayer binding force of polytetrafluoroethylene microporous membrane according to claim 1, wherein a first micro inflator (36) is communicated with the first air bag (11) through a first inflation tube (35), the first micro inflator (36) is fixed on the outer wall surface of the left side plate (8) or the right side plate (9), a first micro aspirator (37) is also fixed on the outer wall surfaces of the left side plate (8) and the right side plate (9), and the first air bag (11) is communicated with the first micro aspirator (37) through a first aspirator (38).
6. The equipment for enhancing interlayer binding force of polytetrafluoroethylene microporous membrane according to claim 2, wherein two liquid nitrogen storage tanks (12) are arranged, are respectively fixed on the left side and the right side of the bottom of the quenching tank (3), a liquid nitrogen recovery tank (15) is fixed between the two liquid nitrogen storage tanks (12), the two liquid nitrogen storage tanks (12) are respectively communicated with the quenching tank (3) through a first communication pipe (13), the first communication pipe (13) is arranged to incline outwards and upwards, one end of a baffle (39) is fixed on the inner side of an opening at the upper end of the first communication pipe, the other end of the baffle (39) is fixed with the upper end of a second communication pipe (16), and the lower end of the second communication pipe (16) stretches into the liquid nitrogen recovery tank (15).
7. An apparatus for enhancing the interlayer bonding force of a polytetrafluoroethylene microporous membrane according to claim 6, wherein said baffle (39) is gradually declined from the outside to the inside.
8. The equipment for enhancing interlayer binding force of polytetrafluoroethylene microporous membrane according to claim 6, wherein a collecting box (40) is arranged on the outer side of the liquid nitrogen storage box (12), and the collecting box (40) is communicated with the quenching box (3) through a communicating channel (41).
9. A method for enhancing interlayer binding force of polytetrafluoroethylene microporous membrane, which is characterized by involving the device according to any one of claims 1 to 8, comprising the following specific steps:
s1, uniformly mixing polytetrafluoroethylene dispersion resin with lubricating oil, compacting, extruding, calendaring, drying, longitudinally stretching, transversely stretching, performing heat setting treatment above a melting point, and cooling to room temperature to obtain a primary setting film A;
s2, drawing the primary shaping film A into a quenching box (3) through a first drawing roller (2) and a second drawing roller (3);
s3, starting a second micro inflator pump (20) to enable the second air bags (19) to be inflated, and further clamping the primary shaping film A between the two second air bags (19);
s4, a first air cylinder (5) and a heating plate (7) are started at the same time, wherein a first telescopic rod (6) of the first air cylinder (5) stretches to drive the heating plate (7) to move downwards until the heating plate (7) approaches to a primary shaping film A in a quenching box (3), at the moment, the first air cylinder (5) stops running, the heating plate (7) starts to heat the primary shaping film A below the first air cylinder to a preset time, a fan (26) and a first micro suction pump (37) are started while the primary shaping film A is heated, the fan (26) blows air to the primary shaping film A above the fan, and the first micro suction pump (37) sucks air to the first air bag (11) to enable the first air bag (11) to shrink slowly;
s5, after heating is completed, the first air cylinder (5) is restarted, the telescopic rod (6) of the first air cylinder is contracted, the heating plate (7) is driven to move upwards and away from the primary shaping film A until the heating plate (7) is driven to an original position, then the first air cylinder (5) stops running, the first air cylinder (5) is started and simultaneously the first liquid suction pump (14), the second liquid suction pump (17), the second air cylinder (24) and the first micro air pump (36) are started, wherein the first liquid suction pump (14) pumps liquid nitrogen stored in the liquid nitrogen storage tank (12) into the first communication pipe (3), then enters a gap between the baffle plate (39) and the primary shaping film A, the primary shaping film A is rapidly cooled, the second liquid suction pump (17) is started, liquid nitrogen between the baffle plate (39) and the primary shaping film A is pumped into the liquid nitrogen recovery tank (15) to be recovered, the second air pump (24) is started, the second telescopic rod (25) is contracted and the fan (26) is driven to enter the left side plate (8) or the right side plate (9) downwards, and the top of the first air pump (11) is completely pushed against the top of the first air pump (11), and the top of the first air pump (11) is completely started;
s6, after the primary shaping film A is cooled, the first liquid suction pump (14) stops working, the first micro air suction pump (37) and the second micro air suction pump (23) are started at the same time, the first micro air suction pump (37) pumps air to the first air bag (11) so that the first air bag (11) is slowly reduced, the second micro air suction pump (23) sucks the second air bag (19) so that a gap for the primary shaping film A to pass through is reserved between the two second air bags (19), then the first traction roller (1) and the second traction roller (2) are started, the processed primary shaping film A is pulled out of the quenching box (3), and the primary shaping film A to be processed is pulled into the quenching box (3), so that the primary shaping film A is circularly reciprocated;
and S7, airing or drying the primary shaping film A treated by the quenching box (3).
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| CN202310104318.3A CN116394553B (en) | 2023-02-13 | 2023-02-13 | Equipment and method for enhancing interlayer binding force of polytetrafluoroethylene microporous membrane |
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| CN202310104318.3A CN116394553B (en) | 2023-02-13 | 2023-02-13 | Equipment and method for enhancing interlayer binding force of polytetrafluoroethylene microporous membrane |
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