CN101831760A - Production method of meta-position aramid nonwoven material for electric insulation - Google Patents
Production method of meta-position aramid nonwoven material for electric insulation Download PDFInfo
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Abstract
The invention discloses a production method of a meta-position aramid nonwoven material for electric insulation. Present aramid insulating materials are mostly produced by using a single process method, and products have certain defects on properties, i.e. tensile strength or electric insulation, and the like. The production method comprises the following steps of: producing a spunlace aramid fabric by adopting a low-quantitation strong-carding less-drafting and low-tension spunlaced nonwoven process by using aramid fibers as raw materials; then carrying out prewetting treatment on the spunlace aramid fabric by using a roller transfer method or an immersion method; and then placing a prewetted fabric roll on a continuous overpressure hot mill provided with a vertical type hot roll to carry out continuous and vertical type overpressure hot rolling so as to obtain the meta-position aramid fabric. The obtained insulating material meta-position aramid fabric has small thickness, uniformity, compactness, high tensile strength and high insulation class properties and can be widely used as the insulating materials of insulation class electric equipment, such as an H-class generator, a motor, a transformer, and the like.
Description
Technical field
The present invention relates to the nonwoven material field, specifically a kind of production method of meta-position aramid nonwoven material for electric insulation.
Background technology
Aramid fiber is a kind of high temperature resistant, insulation, fire-retardant high-performance fiber, and one of its main application is the insulating materials of the motor that is used to make the high class of insulation, generator, transformer etc.The sixties in 20th century, du pont company has been invented has high-performance fiber meta-aramid (be the Nomex fiber, China claims aramid fiber 1313) high temperature resistant, flame-retarding characteristic, and has developed insulating material paper process aramid fiber and water acupuncture manipulation aramid fiber based on this.
Paper process aramid fiber insulating materials is that employing aramid fiber and Fanglun slurry cake are raw material, manufactures paper with pulp into paper, and is hot-forming then.Because paper technology can only can't use long fiber with short fiber (2-5mm), the product that obtains is a paper, and tensile strength is not high, uses and is limited to.
Water acupuncture manipulation aramid fiber cloth adopts water acupuncture manipulation nonwovens process to make, it can adopt long fiber is raw material, the product that obtains is a nonwoven fabric, its tensile strength height, but aramid fiber static is big, be difficult for combing, the outward appearance clouding of product is many, causes that product local porosity is big, the aperture is big, lack of homogeneity, and this electric insulating quality to product has brought influence.
Present aramid fiber insulating materials adopts single process production mostly, and there is certain defective in product on performances such as tensile strength or electric insulation.
Summary of the invention
Technical problem to be solved by this invention is to overcome the defective that above-mentioned prior art exists, a kind of water acupuncture manipulation nonwovens process and compound meta-aramid cloth production process of papermaking superpressure hot rolling technology of adopting is provided, makes meta-aramid cloth reach the requirement of thin thickness and even compact, high-tensile and the high class of insulation.
For this reason, the present invention adopts following technical scheme: a kind of production method of meta-position aramid nonwoven material for electric insulation, and its step is as follows:
The first step is a raw material with the aramid fiber, adopts the low water acupuncture manipulation nonwovens process production water outlet thorn aramid fiber cloth that divides comb, little drawing-off and low-tension quantitatively, by force, and the fibre web grammes per square metre of low quantitatively finger carding machine is 17-22.8 gram/m
2The strong comb that divides refers to that the main cylinder of carding machine and working roll speed ratio are 1: 10-15, little drawing-off refers to that the drafting multiple of drawing machine is 1.6-2.8 times, low-tension is realized at 1.0-1.1 by the Transmission Ratio Control between forward and backward adjacent cells machine, be that tension force between each unit machine reduces as far as possible, to reduce influence to the cloth cover uniformity, tension value is controlled at cloth and can moves forward smoothly and get final product, and described each unit machine refers to that the cylinder dryer of spun-laced machine, oven dry usefulness of drawing machine that drawing-off uses, water thorn usefulness and hot blast penetrate the lapper that dryer and rolling are used.
In second step, because good rigidly, the modulus of aramid fiber are big, high temperature resistant, the density (promptly reducing product thickness) that therefore only adopts High Temperature High Pressure to improve water thorn aramid fiber cloth misses one's aim.For this reason, by roller transfer method or infusion process (controlling moisture content) water thorn aramid fiber cloth is carried out pre-wettability treatment earlier and (preferably adopt the roller transfer method by setting-out after the immersion earlier, moisture content control is more accurate), the moisture content of product is controlled at 50-80%, and the fiber rigidity of aramid fiber is reduced; Re-use the continuous superpressure hot-rolling mill that vertical hot roll is housed and carry out continuous, vertical and the superpressure hot rolling, make aramid fiber produce deformation, thereby reach the high density and the even compact of product the yardage roll after pre-wetting.Vertical hot roll can be converted into the own wt of hot roll the linear pressure of hot rolling, thereby improves the effect of hot rolling.Normal water thorn 66g/m
2The thickness of aramid fiber material is at 0.4-0.5mm, by wetting preliminary treatment of above-mentioned material and hot rolling technology, make the thickness of product be reduced to 0.1mm, reduced by 80% than original thickness, and thickness deviation is controlled at about 0.03mm, has realized that product thickness approaches and the structure of even compact.
Because use insulating material, require the density of material very high, such as 66g/m in occasions such as motor, transformers
2Product, thickness is 0.1mm, but very high tensile strength is arranged again.For this reason, the present invention is by being optimized the non-woven combing of water acupuncture manipulation, drawing-off, water jet process, adopted low comb, little drawing-off, the low-tension water acupuncture manipulation technology of dividing quantitatively, by force, has entanglement effect to fibre with high-efficiency, three-dimensional, to almost not damage of fibre strength, solved big, the lack of homogeneity problem in aperture of existing product effectively, thereby made the electrical insulation properties of product reach the H level; Make the thin and even compact of product thickness by papermaking superpressure hot rolling technology technology again, because the used fiber of water thorn aramid fiber cloth is a long fiber, the tensile strength of insulating materials is guaranteed.The present invention reaches more than the 150N/5cm tensile strength of product, than the aramid fiber insulating paper intensity raising 38% of single paper process, than the aramid fiber nonwoven fabric intensity raising 17% of single water acupuncture manipulation.
As the further of technique scheme improved and replenish, the present invention takes following technical measures:
The process that adopts the roller transfer method to carry out pre-wettability treatment is: by impregnation in water or steel rider under water water is transferred on the water thorn aramid fiber cloth earlier, pressure and the rotating speed by the control pressure roller again is controlled at 50-80% with the moisture content of cloth.The pressure of pressure roller is the 2.5-3.5 kilogram, and rotating speed is 25-35m/min.
Described continuous superpressure hot-rolling mill comprises frame, rack-mounted unwinding device and wrap-up and the many hot rolls that are used for heating and pressurizing, unwinding device is positioned on the platform of frame top, wrap-up is positioned at the below of frame, many hot rolls stack from top to bottom and are vertical arranged vertical, cloth passes from each hot roll from top to bottom successively, there is hydraulic pulldown at the two ends of hot roll, the lumen of hot roll has steam to pass, the surface of hot roll coats waterproof paper (requirement of strength of paper is in use broken for avoid it as far as possible), and waterproof paper prevents that the water after wetting from stinging aramid fiber cloth and directly contacting with hot roll.The pressure 150-250KN/m of hot roll, temperature is the 130-150 degree, the processing number of times of hot rolling is 2-5 time.
The concrete steps of water acupuncture manipulation nonwovens process are: 1) raw material is selected aramid fiber for use, and fineness is the 1.5-2 Denier, and length is 38-51mm; 2) adopt two bale openers to send into aramid fiber and carry out preliminary shredding, described aramid fiber passes through twice shredding (thick shredding, smart shredding), the mixing of many storehouses, combing, cross lapping, drawing-off, water thorn, cylinder oven dry, hot blast successively and penetrates oven dry and rolling operation.
The combing operation with the process conditions of carding machine is: main cylinder linear velocity 900-1150m/min, main cylinder working roll speed 80-100m/min, main cylinder card stripper linear velocity 200-230m/min.
The cross lapping operation with the process conditions of lapping machine is: lapping number of plies 4-8 layer.
The process conditions of drawing machine are that drafting multiple is 1.6-2.8 times.
Spun-laced machine main technique condition is water jet quantity 5-8, and pressure is 30-150bar.
Dryer main technique condition is: cylinder dryer temperature is controlled at 150-180 ℃, and the temperature of rotary screen drier is controlled at 160-190 ℃.
2-5% according to the aramid fiber gross weight when mix in before the thick shredding, before the smart shredding or many storehouses applies the antistatic additive aqueous solution, and the quality percentage composition of antistatic additive is 2-3% in the described antistatic additive aqueous solution.
The present invention adopts low comb, little drawing-off, low-tension water acupuncture manipulation nonwovens process and wetting in advance, continuous, the vertical and superpressure paper technology of dividing quantitatively, by force, the insulating materials meta-aramid cloth that obtains has thin thickness and even compact, high-tensile and high class of insulation performance, can be widely used as the insulating materials of class of insulation electrical equipments such as H level generator, motor, transformer.
The invention will be further described below in conjunction with specification drawings and specific embodiments.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
Fig. 2 is the structural representation of the pre-wettability treatment equipment therefor of the present invention.
Fig. 3 is the part-structure schematic diagram of the continuous superpressure hot-rolling mill of the present invention.
The specific embodiment
Embodiment 1: producing thickness is the insulating materials of 0.1mm
First step spunlace non-woven technology has the following steps:
Selecting fineness for use is that 2 Denier, length are the aramid fiber of 51mm; Adopt two bale openers to send into aramid fiber respectively in proportion and carry out preliminary shredding, penetrate oven dry and rolling operation through twice shredding, the mixing of many storehouses, combing, cross lapping, drawing-off, water thorn, cylinder oven dry, hot blast successively, before shredding or mixing place of many storehouses apply the antistatic additive aqueous solution according to 4.5% of total weight of fiber, the antistatic additive aqueous solution is that the water of 2.5% antistatic additive and 97.5% is formed by the quality percentage composition, to improve the carding effect of fiber.
The capital equipment in the above-mentioned operation or the technological requirement of device are as follows:
The main technique of air pressure hopper is before the carding machine: hopper pressure 4.2mbar, fan speed 63%; The main technique of carding machine is: fibre web grammes per square metre 21.5 gram/m
2, main cylinder linear velocity 1100m/min, main cylinder working roll speed 80m/min, main cylinder card stripper linear velocity 225m/min.The lapping number of plies of cross lapping machine is 5.8 layers, and the drafting multiple of drawing machine is 1.8 times.The spun-laced machine main technique: 8 of water jet quantity, pressure are respectively 45,60,90,120,140,140,140,150bar; It is the double water needle plate of 0.12mm that water thorn plate adopts the aperture.Dryer main technique: 160 ℃ of cylinder dryer temperature, 180 ℃ of rotary screen drier temperature.Transmission Ratio Control between above-mentioned forward and backward adjacent cells machine is 1.0.
The grammes per square metre of the water thorn aramid fiber cloth that above-mentioned technology obtains is 66g/m
2
Utilize wetting in advance, continuous, vertical and superpressure technology is as follows to the step that the said goods carries out pressure rolling:
1) with the roller transfer method aramid fiber water thorn base material (being water thorn aramid fiber cloth) is carried out water-wet and handle (as shown in Figure 2): the water acupuncture manipulation aramid fiber cloth that the first step is obtained is placed on the unwinding rack, the cloth that to emit from unwinding rack behind selvage guide frame, dipping tank, fabric guide roll, enters on the cloth beam successively then.By steel rider under water water is transferred on the water thorn aramid fiber cloth, the pressure roller (under water) that is positioned at directly over the steel rider carries out roll compacting to cloth, and cloth is sandwiched between steel rider and the pressure roller, and the pressure of control pressure roller is 3.5 kilograms, the speed of a motor vehicle 30-35 rice/minute, the moisture content of cloth is 70-80%.
2) cloth that wettability treatment is crossed is placed on the unwinding device of hot-rolling mill (as shown in Figure 3), cloth passes from 12 hot rolls (6 pairs) from top to bottom successively, and carry out continuously hot rolling 4 times, hot-rolled temperature is 145 degree (temperature by control steam is controlled), the pressure of hot roll is 200KN/m (controlling by hydraulic pulldown), and speed of production is 30m/min.
Embodiment 2: producing thickness is the insulating materials of 0.05mm
First step spunlace non-woven technology has the following steps:
Selecting fineness for use is that 2 Denier, length are the aramid fiber of 51mm; Adopt two bale openers to send into aramid fiber respectively in proportion and carry out preliminary shredding, penetrate oven dry and rolling operation through twice shredding, the mixing of many storehouses, combing, cross lapping, drawing-off, water thorn, cylinder oven dry, hot blast successively, before shredding or mixing place of many storehouses apply the antistatic additive aqueous solution according to 4.5% of total weight of fiber, the antistatic additive aqueous solution is that the water of 2.5% antistatic additive and 97.5% is formed by the quality percentage composition, to improve the carding effect of fiber.
The capital equipment in the above-mentioned operation or the technological requirement of device are as follows:
The main technique of air pressure hopper is before the carding machine: hopper pressure 4.1mbar, fan speed 61%; The main technique of carding machine is: fibre web grammes per square metre 19.5 gram/m
2, main cylinder linear velocity 1080m/min, main cylinder working roll speed 90m/min, main cylinder card stripper linear velocity 210m/min.The lapping number of plies of cross lapping machine is 4.4 layers, and the drafting multiple of drawing machine is 1.7 times.The spun-laced machine main technique: 7 of water jet quantity, pressure are respectively 40,50,70,100,120,120,140bar; It is the double water needle plate of 0.12mm that water thorn plate adopts the aperture.Dryer main technique: 150 ℃ of cylinder dryer temperature, 170 ℃ of rotary screen drier temperature.Transmission Ratio Control between above-mentioned forward and backward adjacent cells machine is 1.05.
The grammes per square metre of the water thorn aramid fiber cloth that above-mentioned technology obtains is 50g/m
2
Utilize wetting in advance, continuous, vertical and superpressure technology is as follows to the step that the said goods carries out pressure rolling:
1) with the roller transfer method aramid fiber water thorn base material (being water thorn aramid fiber cloth) is carried out water-wet and handle (as shown in Figure 2): the water acupuncture manipulation aramid fiber cloth that the first step is obtained is placed on the unwinding rack, the cloth that to emit from unwinding rack behind selvage guide frame, dipping tank, fabric guide roll, enters on the cloth beam successively then.By steel rider under water water is transferred on the water thorn aramid fiber cloth, the pressure roller (under water) that is positioned at directly over the steel rider carries out roll compacting to cloth, and cloth is sandwiched between steel rider and the pressure roller, and the pressure of control pressure roller is 3.2 kilograms, the speed of a motor vehicle 30-35 rice/minute, the moisture content of cloth is 70-80%.
2) cloth that wettability treatment is crossed is placed on the unwinding device of hot-rolling mill (as shown in Figure 3), cloth passes from 12 hot rolls (6 pairs) from top to bottom successively, and carry out continuously hot rolling 3 times, hot-rolled temperature is 135 degree (temperature by control steam is controlled), the pressure of hot roll is 180KN/m (controlling by hydraulic pulldown), and speed of production is 35m/min.
Embodiment 3: the product of producing 0.035mm
The first step spunlace non-woven technology of producing the aramid fiber base material has the following steps:
Selecting fineness for use is that 1.5 Denier, length are the aramid fiber of 38mm; Adopt two bale openers to send into aramid fiber respectively in proportion and carry out preliminary shredding, penetrate the water acupuncture manipulation nonwovens process flow process of oven dry and rolling successively through twice shredding, many storehouses mixed cotton, combing, lapping, drawing-off, water thorn, cylinder oven dry, hot blast, before shredding or mixing place of many storehouses apply antistatic profit according to 4.5% of total weight of fiber, the antistatic additive mixed liquor is made up of the water of 2.5% antistatic additive and 97.5%, to improve the carding effect of fiber.
The capital equipment in the above-mentioned operation or the technological requirement of device are as follows:
The main technique of air pressure hopper is before the carding machine: hopper pressure 4.0mbar, fan speed 61%; The main technique of carding machine is: fibre web grammes per square metre 17.5 gram/m
2, main cylinder linear velocity 1000m/min, main cylinder working roll speed 80m/min, main cylinder card stripper linear velocity 200m/min.The lapping number of plies of cross lapping machine is 8 layers, and the drafting multiple of drawing machine is 2.5 times.The spun-laced machine main technique: 6 of water jet quantity, pressure are respectively 35,60,90,90,100,90bar.It is the double water needle plate of 0.1mm that water thorn plate adopts the aperture.The dryer main technique: 150 ℃ of cylinder dryer temperature, 160 ℃ of rotary screen drier temperature, the Transmission Ratio Control between above-mentioned forward and backward adjacent cells machine is 1.1.
The grammes per square metre that above-mentioned technology obtains aramid fiber water thorn base material (being water thorn aramid fiber cloth) is 35g/m
2
Utilize wetting in advance, continuous, vertical, superpressure technology that product is carried out pressure rolling, have the following steps:
1) with roller transfer method or infusion process aramid fiber water thorn base material is carried out water-wet and handle, the pressure of pressure roller is 2.5 kilograms, the control rotating speed 25-30 rice/minute, the moisture content of cloth is 50-60%.
2) cloth that wettability treatment is crossed is placed on the unwinding rack of hot-rolling mill, passes 12 hot rolls from top to bottom successively, and carries out continuously hot rolling 3 times, and hot-rolled temperature is 130 degree, and the pressure of hot roll is 160KN/m, and speed of production is 40m/min.
Claims (9)
1. the production method of a meta-position aramid nonwoven material for electric insulation, its step is as follows:
The first step is a raw material with the aramid fiber, adopts the low water acupuncture manipulation nonwovens process production water outlet thorn aramid fiber cloth that divides comb, little drawing-off and low-tension quantitatively, by force, and the fibre web grammes per square metre of low quantitatively finger carding machine is 17-22.8 gram/m
2, the strong comb that divides refers to that the main cylinder of carding machine and working roll speed ratio are 1: 10-15, and little drawing-off refers to that the drafting multiple of drawing machine is 1.6-2.8 times, low-tension is realized at 1.0-1.1 by the Transmission Ratio Control between forward and backward adjacent cells machine;
Second step, by roller transfer method or infusion process water thorn aramid fiber cloth is carried out pre-wettability treatment earlier, moisture content is controlled at 50-80%, and the rigidity of water thorn aramid fiber cloth is reduced; Then the yardage roll after pre-wetting is put into and carries out continuous, vertical and the superpressure hot rolling on the continuous superpressure hot-rolling mill that vertical hot roll is housed, obtain meta-aramid cloth.
2. the production method of meta-position aramid nonwoven material for electric insulation according to claim 1, it is characterized in that the process that adopts the roller transfer method to carry out pre-wettability treatment is: by impregnation in water or steel rider under water water is transferred on the water thorn aramid fiber cloth earlier, by the pressure and the rotating speed of control pressure roller, the moisture content of cloth is controlled at 50-80% again.
3. the production method of meta-position aramid nonwoven material for electric insulation according to claim 2, the pressure that it is characterized in that pressure roller is the 2.5-3.5 kilogram, rotating speed is 25-35m/min.
4. the production method of meta-position aramid nonwoven material for electric insulation according to claim 1 and 2, it is characterized in that described continuous superpressure hot-rolling mill comprises frame, rack-mounted unwinding device and wrap-up and the many hot rolls that are used for heating and pressurizing, unwinding device is positioned on the platform of frame top, wrap-up is positioned at the below of frame, many hot rolls stack from top to bottom and are vertical arranged vertical, cloth passes from each hot roll from top to bottom successively, there is hydraulic pulldown at the two ends of hot roll, the lumen of hot roll has steam to pass, and the surface of hot roll coats waterproof paper.
5. the production method of meta-position aramid nonwoven material for electric insulation according to claim 4, the linear pressure that it is characterized in that hot roll is 150-250KN/m, and temperature is the 130-150 degree, and the processing number of times of hot rolling is 2-5 time.
6. the production method of meta-position aramid nonwoven material for electric insulation according to claim 5, it is characterized in that the concrete steps of water acupuncture manipulation nonwovens process are: 1) raw material is selected aramid fiber for use, and fineness is that 1.5-2 Denier, length are 38-51mm; 2) adopt two bale openers to send into aramid fiber and carry out preliminary shredding, described aramid fiber penetrates oven dry and rolling operation through twice shredding, the mixing of many storehouses, combing, cross lapping, drawing-off, water thorn, cylinder oven dry, hot blast successively.
7. the production method of meta-position aramid nonwoven material for electric insulation according to claim 6, it is characterized in that the combing operation with the process conditions of carding machine is: main cylinder linear velocity 900-1150m/min, main cylinder working roll speed 80-100m/min, main cylinder card stripper linear velocity 200-230m/min.
8. the production method of meta-position aramid nonwoven material for electric insulation according to claim 6, it is characterized in that the cross lapping operation with the process conditions of lapping machine is: lapping number of plies 4-8 layer, hot blast penetrate baking operation and are controlled at 160-190 ℃ with the temperature of rotary screen drier.
9. the production method of meta-position aramid nonwoven material for electric insulation according to claim 6 is characterized in that in water acupuncture manipulation nonwovens process, and the 2-5% according to the aramid fiber gross weight when mix in before the shredding or many storehouses applies the antistatic additive aqueous solution.
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| CN103568415A (en) * | 2013-11-06 | 2014-02-12 | 嘉兴比诺克特种绝缘材料有限公司 | Production method of composite aramid fiber electrical insulation non-woven material |
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| CN109518314A (en) * | 2017-09-18 | 2019-03-26 | 上海名冠净化材料股份有限公司 | Non-woven fabrics shredding mixed cotton production equipment |
| CN108739254A (en) * | 2018-06-08 | 2018-11-06 | 中国环境科学研究院 | Non-woven cloth culture medium and preparation method thereof and the application in grouting shore bank and being repaired with plant ecological |
| CN108739254B (en) * | 2018-06-08 | 2020-06-26 | 中国环境科学研究院 | Non-woven fabric culture medium, preparation method thereof and application thereof in ecological restoration of plants in grouted shore zone |
| CN113914012A (en) * | 2021-11-05 | 2022-01-11 | 绍兴市恒睿新材料科技有限公司 | Aramid fiber non-woven paper production process |
| CN116001371A (en) * | 2022-12-29 | 2023-04-25 | 常熟市永得利水刺无纺布有限公司 | High Wen Fangwu-resistant pre-oxidized fiber heat-insulating material |
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