CN1268681C - Silicane crosslinked high density polyethylene composition and its preparing method - Google Patents
Silicane crosslinked high density polyethylene composition and its preparing method Download PDFInfo
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Abstract
The present invention discloses novel silane crosslinking polyethylene composition and a preparation method thereof. Polyethylene composition is prepared by the silane crosslinking technology of a two-step method, and the composition can be used for the production, such as crosslinking polyethylene pipes, aluminum-plastic composite pipes of crosslinking polyethylene, etc. According to select compounding crosslinking agents, compounding polymerization inhibitor is increased so as to avoid the beforehand crosslinking of graft materials, and thus, the present invention solves the problem of short storage time in the prior art. The present invention uses HDPE and select suitable carrier resin so as to solve problems of low strength of materials, and the loss of liquid addition agents, such as silane, etc. The novel silane crosslinking polyethylene composition has the advantages of strong processing adaptability for prepared aluminum-plastic composite pipes and crosslinking polyethylene pipes.
Description
Technical field
The present invention relates to a kind of cross-linked polyethylene composition and preparation method thereof, belong to the polymeric composition technical field.The present invention adopts two-step approach crosslinked with silicane technology to prepare polyethylene composition, is used for the production of cross-linked polyethylene pipe, cross-linked polyethylene aluminium plastic composite pipe etc.
Background technology
Pipelines such as water service pipe (comprising hot-water line), water shoot, gas line adopt metal tube more traditionally, the multiple plastic conduit that comprises crosslinked polyethylene pipe at present more and more widely be applied to above-mentioned field.The method of industrial production crosslinked polyethylene has three kinds, is respectively radiation crosslinking, peroxide crosslinking and crosslinked with silicane.Because the radiation crosslinking apparatus expensive, its application is greatly limited, and peroxide crosslinking is wayward owing to process, and Products Quality is more difficult to get assurance, so the direction of people's research is transferred on the crosslinked with silicane technology gradually.The comparatively sophisticated organosilane crosslinked polyethylene of development has following two kinds of methods at present: a kind of is the two-step approach of U.S. Dowcorning company exploitation, is called the Sioplas method, and another kind is the single stage method of Switzerland Nokia-Maillefer company exploitation, is called the Monosil method.These two kinds of technologies respectively have characteristics: one-step method silanes crosslinked is to add in the pipe extruder together after base resin, initiator, linking agent, catalyzer and other auxiliary agents are mixed, its moulding process is simple, equipment is few, produce comparatively economical, but the forcing machine that needs specific type, and in the course of processing, can produce certain precrosslink thing, and the flowability of material is descended, bring certain difficulty to production.Two-step approach needs respectively base resin, initiator, linking agent and other auxiliary agents to be prepared into grafted material, base resin, catalyzer and other auxiliary agents are prepared into catalysing material, then grafted material and catalysing material are mixed, add moulded products in the forcing machine, though comparing with single stage method, two-step approach increased processing step, but technology is easy to control, can prevent too early generation precrosslink in moulding process, and material fluidity is better.Two-step approach and one-step method silanes crosslinked technology all are used for the suitability for industrialized production polyvinyl piping materials at present.
The research of relevant organosilane crosslinked polyethylene is very active in recent years, the visible CN 1198177A of one-step silane cross-linked polyethylene patent, CN 1245187A; The visible CN 1195673A of two-step approach organosilane crosslinked polyethylene patent, EP 0548565A1.
Two-step approach organosilane crosslinked polyethylene suitability for industrialized production remains in following problems at present:
First, the grafted material storage time is short: produce precrosslink owing to the silane in the grafting is easy to react with airborne water, thereby influence tube forming production, this has just determined its preservation period to lack (being generally about 6 months), arranges production to enterprise and brings bigger difficulty and inconvenient.
The second, crosslinked inhomogeneous and cost is higher: CN 1195673A discloses a kind of two-step approach and has prepared silane cross-linked polyethylene aluminium plastic composite material and method for making.In this method, the first step prescription silane crosslinker in the high speed kneading process is volatile and very easily stick on the kneader wall.In addition, silane unavoidably contacts with barrel and screw rod with the forcing machine hopper in the grafting granulation process, thereby causes the silane crosslinker loss, reduced the utilization ratio of expensive silane crosslinker, in addition, the loss of silane crosslinker is at random, very easily causes crosslinked inhomogeneous.
The 3rd, composition and prepared tubing intensity are lower, inaccessible product properties requires: in organosilane crosslinked polyethylene (comprising low density polyethylene, linear low density polyethylene LLDPE and high density polyethylene), reaching under the situation of same percentage of grafting, high density polyethylene(HDPE) is difficulty relatively, and its processing is also difficult relatively after the grafting, easily cause the visual appearance of goods relatively poor, so at present many with LDPE, LLDPE preparation of compositions silane cross-linked polyethylene pipe, and the intensity of this tubing, voltage endurance capability are lower.
The present invention is by the research with keen determination to each component of silanes cross-linked polyethylene composition and preparation method thereof, a kind of novel silane cross-linked polyethylene composition and preparation method thereof has been proposed, by selecting composite linking agent, thereby increase compound polymerization inhibitor and improved the grafting homogeneity, prevent that grafted material is crosslinked too early, prolonged long term storage stability, and selected the suitable carriers resin, solved the problem of auxiliary agent losses such as silane in the prior art, obtained a kind of novel silane cross-linked polyethylene composition, the al-plastics composite pipe of its preparation and cross-linked polyethylene pipe flexibility of operation are strong, excellent product performance.
Summary of the invention
One of purpose of the present invention is to provide a kind of silanes cross-linked polyethylene composition.
Two of purpose of the present invention is to provide a kind of method for preparing said composition.
The production process of two-step approach silanes cross-linked polyethylene composition: the first step adds radical initiator and unsaturated silane and other auxiliary agents in polyethylene, in list or twin-screw reactive forcing machine, carry out graft reaction, the preparation grafted material, second step added silicon alcohol condensation catalyst and other auxiliary agents in polyethylene, extruding pelletization in list or twin screw extruder, the preparation catalysing material.At last grafted material and catalysing material blend are obtained silanes cross-linked polyethylene composition.
The present invention has adopted the auxiliary agent carrier of a kind of fluffy powder shape alpha-olefin copolymer as grafted material, a kind of composite linking agent (comprising unsaturated silane and radical initiator) and a kind of composite stopper have been adopted simultaneously, thereby the degree of crosslinking that has solved the crosslinked with silicane high density polyethylene(HDPE) well is low, the quality shakiness, processing difficulties, shortcomings such as permanent stability difference, especially the use of compound polymerization inhibitor had both reduced the generation of precrosslink reaction in the grafting process, reduced the moment of torsion of forcing machine, improve the grafted material processing characteristics, solved the problem of the grafted material permanent stability difference that causes because of hydrolysis simultaneously again.
Details are as follows in the present invention:
We know that polyethylene can be divided into HDPE, LDPE and LLDPE.There is very big difference in this three quasi-polyethylene on macromolecular structure, and the additive of often selecting in building-up process is also different, and these factors can be to polyethylene-silane grafting and the bigger influence of crosslinked generation.In organosilane crosslinked polyethylene grafting process, polymkeric substance is at free-radical initiator, as superoxide, lose the H atom on the sub polyethylene Zishu carbon atom under the free radical effect that pyrolysis becomes or the two keys of C=C opened on the main chain produce free radical, this free radical and vinyl silanes-CH=CH
2Chain transfer takes place in radical reaction simultaneously, thereby has generated the polymkeric substance that contains three oxygen base estersil bases, i.e. the macromolecular degree of branching of graftomer, so polyethylene is very big to its silane grafting efficiency influence.In general, the degree of branching is big more, macromolecular chain structure is got over irregularity, its side chain is many more, thereby the tertiary carbon atom number that is contained in the macromole is many more, the macromolecular radical that produces under the effect of peroxide initiator is just many relatively more, and is just big more with the grafting number and the probability of unsaturated silane, also just says the easy more grafting of polyethylene macromole.And the macromolecular side chain of polyethylene is many more, the easy more stretching, extension of its molecule, and density reduces relatively, the corresponding reduction of degree of crystallinity, the easy more infiltration of moisture content in the warm water crosslinking process helps the hydrolysis and crosslinked the carrying out of grafts so more; Otherwise the macromolecular degree of branching of polyethylene is low more, macromole is regular more, its side chain is just few more, the tertiary carbon atom number that is contained in the macromole is just few more, therefore superoxide is difficult for dehydrogenation formation macromolecular radical on macromolecular chain, so macromole generation grafted number and probability are just few more, it is more little to show percentage of grafting.And degree of branching introductory note plays the macromolecular chain structure regularity of polyethylene to be increased, and helps the raising of density, and degree of crystallinity is risen, thereby is unfavorable for the hydrolysis of grafted polyethylene and crosslinked.We know, though LDPE, LLDPE, HDPE three's chemical ingredients is similar, its chain structure there are differences, and exist many side chains different in size in the LDPE molecule, particularly contain more long-chain branch; Polymerization single polymerization monomer-alhpa olefin of LLDPE has been introduced many short-chain branchs on its molecular chain when copolymerization, make the macromolecular degree of branching increase; The macromole of HDPE is a linear structure, and side chain is seldom arranged; So polyethylene degree of branching size order is LDPE＞LLDPE＞HDPE.Thereby the easiest grafting of LDPE, LLDPE takes second place, and HDPE is difficult for grafting most.From degree of crystallinity, different poly degree of crystallinity size orders are HDPE＞LLDPE＞LDPE, thereby grafted polyethylene hydrolysis and crosslinked difficulty or ease are HDPE＞LLDPE＞LDPE in proper order.Therefore adopt the polymer manufacture silane cross-linked polyethylene pipe composition of the LLDPE or the high degree of branching of LDPE in the prior art mostly, but tubing intensity, the voltage endurance capability of said composition preparation are lower.For solving the contradiction between percentage of grafting and the tubing intensity, the present invention selects to be to use two or more polyethylene to do base resin, has both guaranteed certain percentage of grafting, has guaranteed the intensity of material again.
The present composition comprises:
Grafted material A, content in composition: parts by weight (down together): 85-95;
Grafted material A forms: a: base resin: polyethylene, consumption are 75-90;
B: carrier: ethylene copolymer, consumption are 10-25;
C: composite linking agent: organic unsaturated silane and superoxide are certainly
By basic initiator, ratio between two is: (2-15): 1, and consumption is 1-4;
D: compound polymerization inhibitor: saturated methoxy silane and amides chemical combination
Thing, ratio between two is: (1-4): 1, consumption is 0.2-2.0;
E: oxidation inhibitor: consumption is 0.05-0.5;
Catalysing material B, content in composition: 5-15;
Catalysing material B forms: f: base resin: polyethylene, consumption are 65-90;
G: carrier: ethylene copolymer, consumption are 10-35;
H: catalyzer: organometallic compound, its consumption are 0.1-3.0;
I: oxidation inhibitor: consumption is 0.2-1.5.
Particularly:
During grafted material A forms component a be melt mass flow rate (MFR) greater than 1.0g/10min (190 ℃, the 2.16Kg counterweight, except that other have indicate down with), be preferably MFR greater than 2.0g/10min, density 〉=0.940g/cm
3High density ethylene multipolymer or different poly blend, component a consumption is 75-90; Components b is an ethylene copolymer, and is preferably bulk density less than 600kg/m
3Fluffy powder shape alpha-olefin copolymer, the components b consumption is 10-25, is lower than this consumption then the polyethylene degree of branching is low excessively among the grafted material A not reach the degree of crosslinking requirement, be higher than this consumption then among the grafted material A polyethylene degree of branching too high, reduce the density of composition, do not reached the tubing requirement of strength; The chemical general formula of the organic unsaturated silane in the amount of component b is R ' RSiY
3R is a monovalence ethylenically unsaturated hydrocarbons base in the formula, Y is hydrolyzable organic group, R ' is for being different from the monovalence alkyl or the group identical with Y of aliphatic unsaturated hydrocarbon base, and the silane in the amount of component b is selected from vinyltrimethoxy silane, vinyltriethoxysilane and composition thereof, peroxide radical initiator in the amount of component b is selected from dicumyl peroxide, di-tert-butyl peroxide etc., amount of component b is organic unsaturated silane, the compound that peroxide radical initiator is mixed in proportion, the amount of component b consumption is preferably 1.5-3.0 part, consumption is crossed the low degree of crosslinking requirement that then do not reach, consumption is too high then not only to have increased material cost, and may cause precrosslink and sizing; Component d is that saturated methoxy silane and amides are (as N, N-N,N-DIMETHYLACETAMIDE etc.) mixture, its consumption is preferably (1-4): 1, component d consumption is preferably 0.5-1.5, component d consumption is crossed to hang down and then can not be played the effect that prevents precrosslink, consumption is too high then not to reach the degree of crosslinking requirement, in silane grafting and cross-linking process, often there are a lot of side reactions to take place, these side reactions to the processing of composition and store unfavorable, so in the course of processing of composition, should reduce the generation of this class reaction as far as possible, for this reason, we have taked adding component d to solve, and add the generation that amides can reduce C-C coupling in the grafting process, improve the processing characteristics of grafted material A, add saturated methoxy silane,, can improve the stability in storage of grafted material A because the speed of the silane hydrolyzate in saturated silane and the grafting is different; One of difference of the present invention and prior art just is to have added component d, and the composite use of component d two components reaches the stability in storage of raising grafted material A and the purpose of processing characteristics; Component e oxidation inhibitor, the preferred oxidation inhibitor that uses non-free radical to capture type in grafted material A, as the oxidation inhibitor of phosphorous acid esters: three (2, the 4-di-tert-butyl-phenyl) phosphorous acid ester etc., its preferable consumption is 0.1-0.4 part.
Component f is the polyethylene of MFR≤5g/10min in the composition of catalysing material B, is preferably MFR≤3g/10min, density 〉=0.940g/cm
3HDPE, its consumption is 65-90; Component g carrier is a puffy powder alpha-olefin copolymer, can use with components b among the grafted material A, and consumption is 10-35; Component h catalyzer is an organometallic compound, is selected from dibutyl tin laurate, dibutyltin diacetate, two sad dibutyl tins etc., and component h consumption is preferably 0.5-2.0 part, and consumption is crossed low then do not reach catalytic efficiency, the too high then crosslinked instability of consumption; Component i is an oxidation inhibitor, can being selected from free radical, to capture agent be that main oxidation inhibitor is (as four [β-(3,5 di-tert-butyl-hydroxy phenyls) propionic acid] pentaerythritol ester etc.) and the oxidation inhibitor of phosphorous acid esters (as three (2, the 4-di-tert-butyl-phenyl) phosphorous acid ester etc.), both ratios are preferably (1-2): 1, and component i consumption is preferably 0.4-1 part.
The content of grafted material A is 85-95 part in silanes cross-linked polyethylene composition, the content of catalysing material B is 5-15 part, catalysing material B content is crossed low then not reaching and is promoted the crosslinked effect of composition, and the catalysing material B too high levels then gel content and the tensile property of composition reduces.
Preparation method of composition:
The preparation of grafted material A:
1. the preparation of the composite linking agent of amount of component b: join organic unsaturated silane and peroxide radical initiator in the mixing equipment in proportion, then with container sealing, in temperature≤23 ℃, take out standby under the rotating speed 50-100 rev/min condition behind mixing time 〉=0.5h;
2. the preparation of component d compound polymerization inhibitor: saturated methoxy silane and amides are joined in the mixing equipment in proportion,, in temperature≤23 ℃, take out standby under the rotating speed 50-100 rev/min condition behind mixing time 〉=0.5h then with container sealing;
3. will together join in the high speed kneader through the composite good amount of component b of above-mentioned two steps, component d and components b and component e, be lower than under 35 ℃ of conditions low speed mixing 2-5 minute in temperature, add component a more in proportion, mix discharging in 2-3 minute, mixed material is extruding pelletization on list or twin-screw reactive forcing machine, and the processing condition of granulation are: temperature range is at 130-210 ℃.The length-to-diameter ratio of screw rod is at (32-44): 1, and the rotating speed of screw rod should guarantee that the residence time of material in barrel be not less than 2 minutes, forcing machine must have the efficient vacuum gas barrier in addition.The material bar of extruding earnestly and the recirculated water cold cut all can, but must pass through hopper formula moisture eliminator drying with the grafted material after the recirculated water cold cut, its condition is: temperature is 70-80 ℃, and the time is 1-2 hour, promptly make grafted material A, with the grafted material A Aluminum-plastic composite bag vacuum packaging of preparation.
The preparation of catalysing material B:
In proportion component g, component h and component i being placed on mixes after 2-5 minute in the high speed kneader, add component f more in proportion, mix discharging in 3-10 minute, with the material granulation in list or twin screw extruder that mixes, temperature is with the temperature of grafted material A, use fervent granulation, promptly make catalysing material B, with catalysing material B Aluminum-plastic composite bag vacuum packaging.
Preparation of compositions:
When producing tubing, grafted material A and catalysing material B added to mix in the high-speed mixer in proportion promptly get silanes cross-linked polyethylene composition in 2-3 minute, join production cross-linked polyethylene aluminium plastic composite pipe or cross-linked polyethylene pipe in the pipe extruder again.
The present invention is by adding the auxiliary agent carrier of components b fluffy powder shape alpha-olefin copolymer as grafted material A, add composite linking agent of amount of component b and component d compound polymerization inhibitor simultaneously, because components b fluffy powder shape alpha-olefin copolymer has fully absorbed amount of component b and component d as carrier, thereby improved the utilization ratio of amount of component b and component d, and owing to added components b, make amount of component b and component d energy homodisperse, solved the cost problem of higher that the silane loss causes simultaneously; Adopt preparation method to prepare the amount of component b linking agent, make organic unsaturated silane and the peroxide radical initiator can homodisperse, therefore solved crosslinked uneven problem in the prior art.Reduced the generation that precrosslink is reacted in the grafting process by adding component d compound polymerization inhibitor, reduced the moment of torsion of forcing machine, improved the processing characteristics of grafted material A, because the stopper hydrolysis ability is higher than the hydrolysis ability of silane, thereby has solved the problem of grafted material A permanent stability difference in the prior art.
The present invention mainly adopts HDPE as base resin, composition density 〉=0.940g/cm
3, Zhi Bei tubing has higher degree of crosslinking simultaneously, thereby has improved the voltage endurance capability for preparing tubing with the present composition.
In sum, the silanes cross-linked polyethylene composition of the present invention's preparation compared with prior art has tangible advantage.This method can guarantee that various components mix, silane is utilized effectively, the composition properties of preparing is good, auxiliary agent rate of loss such as its silane are low, technology simple, but the steady quality longer-term stores (greater than 10 months), degree of crosslinking height, physical and mechanical properties and the processing characteristics of material are good simultaneously, and be widely used, remove and be used in the aluminum-plastic laminated tube field, can also be used for fields such as cross-linking tube and crosslinked cable.
Embodiment
With embodiment effect of the present invention is described below.Table 1 is the composition and the performance of composition, and composition all adopts preparation method's preparation of the present invention.
Starting material are:
Component a:HDPE1 density 0.954g/cm
3, MFR 1.0g/10min; HDPE2 density 0.955g/cm
3, MFR 7.0g/10min;
Components b: alpha-olefin copolymer density 0.920g/cm
3, MFR 1.9g/10min, bulk density 550kg/m
3
Amount of component b:
1 what list is the ratio of vinyltriethoxysilane and dicumyl peroxide, adopts the composite back of preparation method of the present invention to use;
2 what list is the ratio of vinyltriethoxysilane and dicumyl peroxide, uses separately, non-composite;
3 what list is the ratio of vinyltriethoxysilane and di-tert-butyl peroxide, adopts the composite back of preparation method of the present invention to use;
4 what list is the ratio of vinyltriethoxysilane and di-tert-butyl peroxide, uses separately, non-composite;
Component d: what list is the ratio of saturated silane of methyl and N,N-dimethylacetamide,
Adopt the composite back of preparation method of the present invention to use;
Component e: three (2, the 4-di-tert-butyl-phenyl) phosphorous acid ester;
Component f:HDPE density 0.954g/cm
3, MFR 1.0g/10min;
Component g: alpha-olefin copolymer density 0.922g/cm
3, MFR 2.0g/10min, bulk density 530kg/m
3
Component h: dibutyl tin laurate;
Component i: four [β-(3,5 di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester and (three (2, the 4-di-tert-butyl-phenyl) phosphorous acid ester.
The testing method explanation:
1. the penetrating quality of liquid adjuvants: the residual quantity by the high-speed mixer surface judges that liquid adjuvants comprises amount of component b, component d and component h;
2. Vicat softening point: GB/T 1633-1989, load 1Kg;
3. degree of crosslinking: ASTM D2655-1995;
4. tensile property (tensile strength, elongation at break): GB/T 1040-1992, rate of extension is 50mm/min;
5. grafted material A processing characteristics: the quality by extruded stock bar surface is judged;
6. the permanent stability of grafted material A are represented with the MFR velocity of variation, will survey MFR immediately after the grafted material A preparation
1(condition: 190 ℃, 5Kg, down together), with vacuum-packed several bags of Aluminum-plastic composite bag of grafted material A, test in every month is one bag MFR wherein
i, MFR velocity of variation=(MFR
1-MFR
I-min)/MFR
1
Wherein: i represents the order of test duration; MFR
I-minExpression MFR
iIn minimum M FR velocity of variation show that then the stability of material is good more more for a short time;
7. the grafting homogeneity of grafted material A material and stability are subjected to the influence of grafted material A material residuals content, and its testing method is:
Equipment: the TGA2950-hot weightless instrument, U.S. TA company produces,
Condition: in nitrogen, heat up, represent that with 200 ℃ thermal weight loss rate the residuals content of grafted material A, grafted material A expect that residuals content low more then material grafting homogeneity and stability are good more with 10 ℃/min.
As seen from Table 1, present composition excellent property.And Comparative Examples 1 is not owing to use vector resin in grafted material A, and the penetrating quality of liquid adjuvants is bad, and grafted material A material residuals content is higher; Comparative Examples 2 and Comparative Examples 3 are owing to amount of component b in grafted material A has been used non-composite linking agent, so the processing characteristics of grafted material A is bad, and permanent stability are bad, residuals content increases; Comparative Examples 4 is not owing to use component d in grafted material A, so the processing characteristics of grafted material A is bad, and permanent stability are bad, residuals content increases.
The present invention is not limited only to above-mentioned explanation and embodiment, needs only the said composition with principle of the invention preparation, all in the scope that the present invention relates to.
The composition of table 1. present composition and performance
| Composition is formed and performance | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | ||||
| Grafted material A | Component a | Form | HDPE1∶HDPE2 | 75∶25 | 75∶25 | 75∶25 | 75∶25 | 75∶25 | |
| Parts by weight | 90 | 85 | 75 | 85 | 85 | ||||
| The components b parts by weight | 10 | 15 | 25 | 15 | 15 | ||||
| Amount of component b | Form | 1 | 5∶1 | 5∶1 | 5∶1 | 10∶1 | 3∶1 | ||
| 2 | |||||||||
| 3 | |||||||||
| 4 | |||||||||
| Parts by weight | 2 | 2 | 2 | 2 | 2 | ||||
| Component d | Form | 2∶1 | 2∶1 | 2∶1 | 2∶1 | 2∶1 | |||
| Parts by weight | 1 | 1 | 1 | 1 | 1 | ||||
| Component e parts by weight | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | ||||
| Density g/cm 3 | 0.954 | 0.955 | 0.942 | 0.944 | 0.954 | ||||
| MFR g/10min | 0.33 | 0.56 | 0.55 | 0.67 | 0.31 | ||||
| Catalysing material B | Component f parts by weight | 65 | 65 | 65 | 65 | 65 | |||
| Component g parts by weight | 35 | 35 | 35 | 35 | 35 | ||||
| Component h parts by weight | 1 | 1 | 1 | 1 | 1 | ||||
| Component i parts by weight | 0.5 | 0.6 | 0.6 | 0.6 | 0.5 | ||||
| Composition | Grafted material A parts by weight | 95 | 95 | 95 | 95 | 95 | |||
| Catalysing material B parts by weight | 5 | 5 | 5 | 5 | 5 | ||||
| Effect and performance index | The penetrating quality of liquid adjuvants | Good | Good | Good | Good | Good | |||
| Vicat softening point ℃ | 120.0 | 122.0 | 121.0 | 120.1 | 123.0 | ||||
| Degree of crosslinking % | 67.1 | 70.3 | 68.1 | 65.6 | 73.4 | ||||
| Tensile strength MPa | 24.0 | 22.0 | 23.0 | 22.5 | 25.0 | ||||
| Elongation at break % | 430 | 450 | 460 | 440 | 460 | ||||
| Grafted material A processing characteristics | Good | Good | Good | Good | Good | ||||
| Grafted material A permanent stability % | 17.0 | 16.0 | 15.5 | 16.2 | 16.5 | ||||
| Grafted material A residuals content % | 0.030 | 0.020 | 0.020 | 0.030 | 0.035 | ||||
Continuous table 1.
| Composition is formed and performance | Embodiment 6 | Embodiment 7 | Embodiment 8 | Embodiment 9 | Embodiment 10 | ||||
| Grafted material A | Component a | Form | HDPE1∶HDPE2 | 75∶25 | 75∶25 | 75∶25 | 75∶25 | 75∶25 | |
| Parts by weight | 85 | 85 | 85 | 85 | 85 | ||||
| The components b parts by weight | 15 | 15 | 15 | 15 | 15 | ||||
| Amount of component b | Form | 1 | 5∶1 | 5∶1 | |||||
| 2 | |||||||||
| 3 | 10∶1 | 5∶1 | 3∶1 | ||||||
| 4 | |||||||||
| Parts by weight | 2 | 2 | 2 | 2 | 2 | ||||
| Component d | Form | 1.3∶1 | 2∶2 | 2∶1 | 2∶1 | 2∶1 | |||
| Parts by weight | 1 | 1 | 1 | 1 | 1 | ||||
| Component e parts by weight | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | ||||
| Density g/cm 3 | 0.954 | 0.954 | 0.942 | 0.955 | 0.955 | ||||
| MFRg/10min | 0.35 | 0.55 | 0.55 | 0.43 | 0.43 | ||||
| Catalysing material B | Component f parts by weight | 65 | 65 | 65 | 65 | 65 | |||
| Component g parts by weight | 35 | 35 | 35 | 35 | 35 | ||||
| Component h parts by weight | 1 | 1 | 1 | 1 | 1 | ||||
| Component i parts by weight | 0.5 | 0.6 | 0.6 | 0.6 | 0.6 | ||||
| Composition | Grafted material A parts by weight | 95 | 95 | 95 | 95 | 90 | |||
| Catalysing material B parts by weight | 5 | 5 | 5 | 5 | 10 | ||||
| Effect and performance indications | The penetrating quality of liquid adjuvants | Good | Good | Good | Good | Good | |||
| Vicat softening point ℃ | 122.0 | 122.5 | 121.0 | 122.4 | 123.0 | ||||
| Degree of crosslinking % | 70.5 | 69.5 | 68.1 | 67.6 | 68.0 | ||||
| Tensile strength MPa | 24.5 | 23.5 | 23.0 | 24.2 | 24.3 | ||||
| Elongation at break % | 465 | 465 | 460 | 470 | 467 | ||||
| Grafted material A processing characteristics | Good | Good | Good | Good | Good | ||||
| Grafted material A permanent stability % | 15.0 | 14.0 | 16.7 | 16.2 | 16.5 | ||||
| Grafted material A residuals content % | 0.015 | 0.010 | 0.035 | 0.031 | 0.033 | ||||
Continuous table 1.
| Composition is formed and performance | Embodiment 11 | Embodiment 12 | Embodiment 13 | Embodiment 14 | |||
| Grafted material A | Component a | Form | HDPE1∶HDPE2 | 75∶25 | 75∶25 | 80∶20 | 80∶20 |
| Parts by weight | 85 | 85 | 85 | 85 | |||
| The components b parts by weight | 15 | 15 | 15 | 15 | |||
| Amount of component b | Form | 1 | 5∶1 | 5∶1 | |||
| 2 | |||||||
| 3 | 5∶1 | 5∶1 | |||||
| 4 | |||||||
| Parts by weight | 2 | 2 | 2 | 2 | |||
| Component d | Form | 1.3∶1 | 2∶2 | 2∶1 | 2∶1 | ||
| Parts by weight | 1 | 1 | 1 | 1 | |||
| Component e parts by weight | 0.1 | 0.1 | 0.1 | 0.1 | |||
| Density g/cm 3 | 0.953 | 0.954 | 0.951 | 0.952 | |||
| MFR g/10min | 0.42 | 0.42 | 0.30 | 0.55 | |||
| Catalysing material B | Component f parts by weight | 65 | 65 | 65 | 65 | ||
| Component g parts by weight | 35 | 35 | 35 | 35 | |||
| Component h parts by weight | 1 | 1 | 1 | 1 | |||
| Component i parts by weight | 0.6 | 0.6 | 0.6 | 0.6 | |||
| Composition | Grafted material A parts by weight | 85 | 95 | 95 | 95 | ||
| Catalysing material B parts by weight | 15 | 5 | 5 | 5 | |||
| Effect and performance index | The penetrating quality of liquid adjuvants | Good | Good | Good | Good | ||
| Vicat softening point ℃ | 123.0 | 123.2 | 119.5 | 115.1 | |||
| Degree of crosslinking % | 67.0 | 66.2 | 68.6 | 67.3 | |||
| Tensile strength MPa | 23.1 | 23.5 | 23.1 | 20.1 | |||
| Elongation at break % | 470 | 467 | 478 | 565 | |||
| Grafted material A processing characteristics | Good | Good | Good | Good | |||
| Grafted material A permanent stability % | 16.1 | 16.7 | 16.3 | 15.3 | |||
| Grafted material A residuals content % | 0.030 | 0.032 | 0.023 | 0.020 | |||
Continuous table 1.
| Composition is formed and performance | Comparative Examples 1 | Comparative Examples 2 | Comparative Examples 3 | Comparative Examples 4 | ||||
| Grafted material A | Component a | Form | HDPE1∶HDPE2 | 75∶25 | 80∶20 | 85∶15 | 85∶15 | |
| Parts by weight | 100 | 85 | 85 | 85 | ||||
| The components b parts by weight | 0 | 15 | 15 | 15 | ||||
| Amount of component b | Form | 1 | 5∶1 | 5∶1 | ||||
| 2 | 5∶1 | |||||||
| 3 | ||||||||
| 4 | 5∶1 | |||||||
| Parts by weight | 2 | 2 | 2 | 2 | ||||
| Component d | Form | 2∶1 | 2∶1 | 2∶1 | ||||
| Parts by weight | 1 | 1 | 1 | 0 | ||||
| Component e parts by weight | 0.1 | 0.1 | 0.1 | 0.1 | ||||
| Density g/cm 3 | 0.954 | 0.954 | 0.954 | 0.954 | ||||
| MFRg/10min | 0.35 | 0.25 | 0.22 | 0.66 | ||||
| Catalysing material B | Component f parts by weight | 65 | 65 | 65 | 65 | |||
| Component g parts by weight | 35 | 35 | 35 | 35 | ||||
| Component h parts by weight | 1 | 1 | 1 | 1 | ||||
| Component i parts by weight | 0.6 | 0.6 | 0.6 | 0.6 | ||||
| Composition | Grafted material A parts by weight | 95 | 95 | 95 | 95 | |||
| Catalysing material B parts by weight | 5 | 5 | 5 | 5 | ||||
| Effect and performance index | The penetrating quality of liquid adjuvants | Bad | Good | Good | Good | |||
| Vicat softening point ℃ | 119.0 | 117.0 | 119.3 | 120.3 | ||||
| Degree of crosslinking % | 67.0 | 66.0 | 64.6 | 65.5 | ||||
| Tensile strength Mpa | 20.3 | 20.0 | 22.0 | 23.0 | ||||
| Elongation at break % | 350 | 350 | 456 | 465 | ||||
| Grafted material A processing characteristics | Generally | Bad | Bad | Bad | ||||
| Grafted material A permanent stability % | 16.5 | 17.8 | 17.2 | 18.9 | ||||
| Grafted material A residuals content % | 0.040 | 0.043 | 0.042 | 0.045 | ||||
Claims (8)
1. silanes cross-linked polyethylene composition comprises:
Grafted material A, content in composition: consumption is 85-95;
Grafted material A forms: a: base resin: ethylene copolymer, consumption are 75-90;
B: carrier: ethylene copolymer, consumption are 10-25;
C: composite linking agent: organic unsaturated silane and superoxide are certainly
By basic initiator, ratio between two is: (2-15): 1, and consumption is
1-4；
D: compound polymerization inhibitor: saturated methoxy silane and amides chemical combination
Thing, ratio between two is: (1-4): 1, consumption is 0.2-2.0;
E: oxidation inhibitor: consumption is 0.05-0.5;
Catalysing material B, content in composition: 5-15;
Catalysing material B forms: f: base resin: polyethylene, consumption are 65-90;
G: carrier: ethylene copolymer, consumption are 10-35;
H: catalyzer: organometallic compound, its consumption are 0.1-3.0;
I: oxidation inhibitor: consumption is 0.2-1.5;
Above consumption is parts by weight;
Wherein: component a is that MFR is greater than the 1.0g/10min polyethylene; Components b and component g are respectively bulk density less than 600kg/m
3Fluffy powder shape ethylene copolymer; The chemical general formula of the organic unsaturated silane in the amount of component b is R ' RSiY
3R is a monovalence ethylenically unsaturated hydrocarbons base in the formula, Y is hydrolyzable organic group, and R ' is for being different from the monovalence alkyl or the group identical with Y of aliphatic unsaturated hydrocarbon base, and amount of component b is organic unsaturated silane, peroxide radical initiator by than row blended compound; Component d is the compound of saturated methoxy silane and amides, and component e is the oxidation inhibitor that non-free radical is captured type; Component f is the polyethylene of MFR≤5g/10min.
2. composition according to claim 1, it is characterized in that component a be MFR greater than 2.0g/10min, density 〉=0.940g/cm
3High density polyethylene(HDPE).
3. composition according to claim 1, it is characterized in that the silane in the amount of component b is selected from vinyltrimethoxy silane, vinyltriethoxysilane and composition thereof, peroxide radical initiator is selected from dicumyl peroxide or di-tert-butyl peroxide, and consumption is 1.5-3.0 part.
4. composition according to claim 1, it is characterized in that component d is saturated methoxy silane and amides in (1-2): the compound of 1 ratio, consumption are 0.5-1.5.
5. composition according to claim 1 is characterized in that component e is the oxidation inhibitor of phosphorous acid esters, and consumption is 0.1-0.4; Component f is MFR≤3g/10min, density 〉=0.940g/cm
3HDPE; Component h is selected from two lauric acid dibutylester tin, oxalic acid dibutylester tin or two sad dibutylester tin, and consumption is 0.5-2.0.
6. composition according to claim 1 is characterized in that component e is three (2, the 4-di-tert-butyl-phenyl) phosphorous acid ester; Component i is that four [β-(3,5 di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester and three (2, the 4-di-tert-butyl-phenyl) phosphorous acid ester is pressed 1: 1 mixed thing, and component i consumption is 0.4-1.0 part.
7. preparation of compositions method according to claim 1:
The preparation of grafted material A:
The preparation of the composite linking agent of amount of component b: organic unsaturated silane and peroxide radical initiator are joined in the mixing equipment in proportion, and sealing in temperature≤23 ℃, is taken out standby behind mixing time 〉=0.5h under the rotating speed 50-100 rev/min condition;
The preparation of component d compound polymerization inhibitor: saturated methoxy silane and amides are joined in the mixing equipment in proportion, and sealing in temperature≤23 ℃, is taken out standby behind mixing time 〉=0.5h under the rotating speed 50-100 rev/min condition;
To together join in the high speed kneader through the composite good amount of component b of above-mentioned two steps, component d and components b and component e, be lower than under 35 ℃ of conditions low speed mixing 2-5 minute in temperature, add component a more in proportion, mix discharging in 2-3 minute, mixed material extruding pelletization on reactive extruder, the processing condition of granulation are: temperature range is at 130-210 ℃, the length-to-diameter ratio of screw rod is at (32-44): 1, the rotating speed of screw rod should guarantee that the residence time of material in barrel be not less than 2 minutes, and forcing machine must have the efficient vacuum gas barrier; The material bar of extruding earnestly makes grafted material A, with the grafted material A Aluminum-plastic composite bag vacuum packaging of preparation;
The preparation of catalysing material B:
In proportion component g, component h and component i being placed on mixes after 2-5 minute in the high speed kneader, add component f more in proportion, mix discharging in 3-10 minute, with the material granulation in forcing machine that mixes, temperature is with the temperature of grafted material A, use fervent granulation, make catalysing material B, with catalysing material B Aluminum-plastic composite bag vacuum packaging;
Preparation of compositions:
When producing tubing, grafted material A and catalysing material B added to mix in the high-speed mixer in proportion promptly got silanes cross-linked polyethylene composition in 2-3 minute.
8. preparation of compositions method according to claim 1:
The preparation of grafted material A:
The preparation of the composite linking agent of amount of component b: organic unsaturated silane and peroxide radical initiator are joined in the mixing equipment in proportion, and sealing in temperature≤23 ℃, is taken out standby behind mixing time 〉=0.5h under the rotating speed 50-100 rev/min condition;
The preparation of component d compound polymerization inhibitor: saturated methoxy silane and amides are joined in the mixing equipment in proportion, and sealing in temperature≤23 ℃, is taken out standby behind mixing time 〉=0.5h under the rotating speed 50-100 rev/min condition;
To together join in the high speed kneader through the composite good amount of component b of above-mentioned two steps, component d and components b and component e, be lower than under 35 ℃ of conditions low speed mixing 2-5 minute in temperature, add component a more in proportion, mix discharging in 2-3 minute, mixed material extruding pelletization on reactive extruder, the processing condition of granulation are: temperature range is at 130-210 ℃, the length-to-diameter ratio of screw rod is at (32-44): 1, the rotating speed of screw rod should guarantee that the residence time of material in barrel be not less than 2 minutes, and forcing machine must have the efficient vacuum gas barrier; The material strip adoption recirculated water cold cut granulation of extruding, with the process of the grafted material after cold cut hopper formula moisture eliminator drying, its condition is: temperature is 70-80 ℃ then, the time is 1-2 hour; Grafted material A Aluminum-plastic composite bag vacuum packaging with preparation;
The preparation of catalysing material B:
In proportion component g, component h and component i being placed on mixes after 2-5 minute in the high speed kneader, add component f more in proportion, mix discharging in 3-10 minute, with the material granulation in forcing machine that mixes, temperature is with the temperature of grafted material A, use fervent granulation, make catalysing material B, with catalysing material B Aluminum-plastic composite bag vacuum packaging;
Preparation of compositions:
When producing tubing, grafted material A and catalysing material B added to mix in the high-speed mixer in proportion promptly got silanes cross-linked polyethylene composition in 2-3 minute.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 02151548 CN1268681C (en) | 2002-12-31 | 2002-12-31 | Silicane crosslinked high density polyethylene composition and its preparing method |
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| CN102241864A (en) * | 2010-05-12 | 2011-11-16 | 黄山景江科技有限公司 | Silane-grafted high-density polyethylene room-temperature cross-linking special material and preparation method thereof |
| MX2012013630A (en) * | 2010-05-25 | 2013-04-03 | Viega Llc | Crosslinkable polyethylene composition. |
| CN105906926A (en) * | 2016-07-06 | 2016-08-31 | 吴江佳通光缆有限公司 | High-strength polyethylene tube for communication and preparation method thereof |
| CN106220969A (en) * | 2016-08-27 | 2016-12-14 | 潍坊市宏源防水材料有限公司 | A kind of silane cross-linked polyolefin waterproof roll and preparation technology thereof |
| CN106832503A (en) * | 2016-11-30 | 2017-06-13 | 陕西省石油化工研究设计院 | A kind of polyethylene crosslinking is modified the method for preparing special material for tube |
| CN112409675A (en) * | 2020-12-18 | 2021-02-26 | 威远凤凰高新材料有限责任公司 | High-pressure flexible composite pipe material and preparation method thereof |
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