CN105544286A - Preparation method of p-aramid fiber-mica paper - Google Patents
Preparation method of p-aramid fiber-mica paper Download PDFInfo
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- CN105544286A CN105544286A CN201510939494.4A CN201510939494A CN105544286A CN 105544286 A CN105544286 A CN 105544286A CN 201510939494 A CN201510939494 A CN 201510939494A CN 105544286 A CN105544286 A CN 105544286A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
- D21H15/10—Composite fibres
- D21H15/12—Composite fibres partly organic, partly inorganic
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/26—Polyamides; Polyimides
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/36—Inorganic fibres or flakes
- D21H13/38—Inorganic fibres or flakes siliceous
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
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Abstract
The invention relates to a preparation method of a p-aramid fiber-mica paper. The preparation method comprises defibering and dispersing silane coupling agent-modified p-aramid chopped fibers to obtain slurry A, carrying out screening on the p-aramid fibrids with a beating degree of 40-65 degrees SR to obtain slurry B, modifying mica plates through an ionic starch solution to obtain modified mica plates, mixing the slurry A, the slurry B and the modified mica plates to obtain uniform mixed slurry, wherein the uniform mixed slurry comprises, by mass, 10-20% of p-aramid chopped fibers, 20-40% of the p-aramid fibrids and 40-70% of the mica plates, carrying out sizing, dehydration and formation on the mixed slurry, carrying out squeezing and drying and carrying out hot press molding to obtain the p-aramid fiber-mica paper. The p-aramid fiber-mica paper obtained through fiber screening and modification, wet method paper making and hot pressing molding has good evenness, excellent mechanical strength, excellent dielectric breakdown strength and high temperature resistance stability.
Description
[technical field]
The invention belongs to paper industry and insulation industry crossing domain, be specifically related to a kind of preparation method of para-aramid fiber mica paper.
[background technology]
Along with petering out of high-quality mica resource, utilizing mica paper prepared by mica flake, possess that the fluctuation of nontoxic, tasteless, anticorrosive, ageing-resistant, dielectric strength is little, corona inception voltage is high and the feature such as stable, is optimal high-temperature insulation material in the world.Mica paper to be tiny mica sheet be main raw material manufactures paper with pulp through the modern paper wet method paper-based insulation material prepared and obtain, it is shaped and mainly relies on Van der Waals force between mica sheet and electrostatic force, thus the mechanical strength causing into paper is less, is difficult to meet instructions for use and production efficiency is low.
In order to improve the mechanical strength of mica paper, and ensure its insulating properties, the reinforcement of current employing is mainly using meta-aramid fibers as the reinforcing material of mica paper, and this is also the important directions of high-quality combined mica paper insulation development.Patent " fiber-mica paper and production method thereof ", publication number: CN102760513A, publication date: 2012.10.31, the mica adopting the aramid fiber 1313,85 ~ 94% of 6 ~ 15% is raw material, is prepared the mica paper with higher dielectric strength by cylinder mould machine; Patent " a kind of method of making mica paper by reinforcement of aramid short fiber and chemical pulping ", publication number CN101748648A, publication date: 2010.06.23, adopts 3 ~ 15% staple fibers to strengthen mica paper, its mica adopts chemistry calcining slurrying, and its Strength of Mica-paper is improved; Patent " a kind of method of regenerating mica paper through reinforcement of aramid precipitated fiber ", publication number CN101748647A, publication date: 2010.06.23, adopts 2 ~ 20% fibrids to be raw material with the mica through hydro-pulping, enhance mica paper mechanical performance, improve production efficiency.
What above-mentioned patent was all introduced is the method adopting meta-aramid fibers to strengthen mica paper, improve mechanical performance or the dielectric strength of mica paper to a certain extent, but, because the heat resistance of meta-aramid fibers body is limited, its Long-Time Service temperature is 200 DEG C, be difficult to the requirement reaching C class B insulation grade and above material, be difficult to the use meeting high-end field.Along with large-size machine develops to miniaturization, particularly the equipment such as wind-powered electricity generation, nuclear power, high ferro traction electric machine all require that motor volume is little, dielectric strength is high, long service life, safe and reliable, therefore higher requirement be it is also proposed to mica paper, be badly in need of preparing mechanical performance and the more excellent high-quality mica paper of dielectric strength.
[summary of the invention]
The object of the invention is to overcome problems of the prior art, a kind of preparation method of para-aramid fiber mica paper is provided, p-aramid fiber staple fiber, p-aramid fiber fibrid and mica sheet is adopted to be raw material, the para-aramid fiber mica paper mechanical performance prepared and dielectric strength are given prominence to, and thermal property is excellent.
In order to achieve the above object, the present invention adopts following technical scheme:
Preparation process is as follows:
(1) the p-aramid fiber staple fiber after silane coupler modified is discongested dispersion, obtain slurry A;
(2) by beating degree be 40 ~ 65 ° of SR p-aramid fiber fibrid through screening, obtain slurry B;
(3) in mica sheet, add cationic starch solution form modified micaceous slurry and carry out modification, modifiedly to rinse well, obtain modified micaceous;
(4) slurry A, slurry B and modified micaceous are mixed, obtain mixed slurry, wherein by mass percentage, the short aramid fiber of cutting of contraposition is 10 ~ 20%, and p-aramid fiber fibrid is 20 ~ 40%, and modified micaceous is 40 ~ 70%;
(5) by mixed slurry starching drainage and formation, more hot-forming after squeezing and oven dry, obtain para-aramid fiber mica paper.
Further, in step (1), the length of p-aramid fiber staple fiber is 4 ~ 12mm, fiber number 1.5D.
Further, in step (1), the mass concentration of silane coupler is 3 ~ 10%, and consumption is 0.1 ~ 1% of relative staple fiber absolute dry mass, modification time 1 ~ 10h, slurry A mass concentration 0.01 ~ 0.05%.
Further, in step (2), p-aramid fiber fibrid screens through pulp classifier, the p-aramid fiber fibrid distribution of lengths of screening at 35 ~ 140 orders, the mass concentration 0.1 ~ 0.5% of slurry B.
Further, in step (3), mica sheet is again through cationic starch solution modification after ultrasonic wave is peeled off, and the power that ultrasonic wave is peeled off is 800 ~ 3000W, and the time is 1 ~ 10h.
Further, in step (3), mica sheet chooses proportioning for≤20 orders by screening: 20 ~ 40 orders :≤40 orders=(1 ~ 3): (4 ~ 6): after the grade combination of 3, then through cationic starch solution modification.
Further, the mass concentration 0.01 ~ 0.1% of step (3) cationic starch solution, the mass concentration of modified micaceous slurry is 10 ~ 20%, modification time 10 ~ 60min.
Further, in step (5), upper net forming adopts ultralow dense inclined-wire form, and with the online of pressurized screen screening mixed slurry, online concentration is 0.005 ~ 0.02%.
Further, adopt three-roller type hot press to carry out hot-forming in step (5), and hot pressing temperature is 280 ~ 380 DEG C, linear pressure is 100 ~ 300kN/m, and roller speed is 1.0 ~ 4.0m/min, and hot pressing number of times is 1 ~ 3 time.
Further, in step (5), the p-aramid fiber mica paper after hot pressing maintains insulation 3 ~ 10min through the baking oven of 280 ~ 320 DEG C.
Compared with prior art, the present invention has following useful technique effect:
The present invention adopts p-aramid fiber staple fiber, p-aramid fiber fibrid and mica sheet to be raw material, the technique such as to be manufactured paper with pulp by fibre fractionation and modification, wet method, hot-forming prepares the para-aramid fiber mica paper of high-quality, wherein p-aramid fiber fibrid is a kind of para-aramid fiber of novel synthesis, compared to traditional PPTA-pulp fiber, it has more excellent solution dispersion performance and composite strengthening effect, and thermal property is stablized, and temperature of initial decomposition is up to 550 DEG C, the present invention adopts p-aramid fiber fibrid and p-aramid fiber staple fiber to strengthen mica paper, but because the surface inertness of p-aramid fiber fibrid and staple fiber is higher, and hot pressing is difficult to produce melting, adhesion between fiber and mica sheet is more weak, cause into paper to manufacture paper with pulp difficulty and low strength, therefore the performance of para-aramid fiber mica paper is strengthened by mica sheet and fibre modification process, combine the excellent specific property of para-aramid fiber and mica bi-material, formation of sheet is better, possesses excellent mechanical strength, dielectric breakdown strength and heat-resistant stable, tensile strength can reach 36.6N/cm, tearing strength can reach 1.7N, dielectric strength can reach 25.7kV/mm, Long-Time Service temperature reaches more than 300 DEG C.The inventive method solves that Strength of Mica-paper is low, insulating properties are poor, and the difficult resistant to elevated temperatures problem of meta-aramid fibers mica paper, and effectively improve into the evenness of paper, for electro-mechanical arts provides high-quality new insulation material, be the important channel of preparation high-quality NEW TYPE OF COMPOSITE mica insulation paper, there is great market prospects and realistic meaning.
[accompanying drawing explanation]
Fig. 1 is process chart of the present invention.
[detailed description of the invention]
Below in conjunction with accompanying drawing, the present invention is described in further details.
See Fig. 1, the preparation method of a kind of para-aramid fiber mica paper of the present invention, specifically implements according to following steps:
(1) length 4 ~ 12mm is adopted, the p-aramid fiber staple fiber of fiber number 1.5D is through silane coupler modified, the mass concentration 3 ~ 10% of silane coupler, silane coupler consumption is 0.1 ~ 1% of relative staple fiber absolute dry mass, modification time 1 ~ 10h, fully discongest dispersion, obtain slurry A, slurry A mass concentration 0.01 ~ 0.05%;
(2) be that the p-aramid fiber fibrid of 40 ~ 65 ° of SR carries out through screening instrument by beating degree, the p-aramid fiber fibrid distribution of lengths filtered out is 35 ~ 140 orders, and dilution dispersion obtains slurry B, the mass concentration 0.1 ~ 0.5% of slurry B;
(3) adopt white clouds master slice or sericite sheet to peel off through ultrasonic wave and obtain mica sheet, treatment conditions are: power is 800 ~ 3000W, time is 1 ~ 10h, mica sheet chooses suitable grade in Zhao≤20 order by pulp classifier: 20 ~ 40 order :≤40 order grain grade proportion=(1 ~ 3): (4 ~ 6): after the ratio of 3 combines, add cationic starch solution again to form modified micaceous slurry and carry out modification, the mass concentration 0.01 ~ 0.1% of cationic starch solution, the mass concentration 10 ~ 20% of modified micaceous slurry, modification time 10 ~ 60min; Modifiedly to rinse well, obtain modified micaceous;
(4) slurry A, slurry B and modified micaceous are mixed, obtain mixed slurry; Wherein, the mixing quality percentage of three kinds of materials is: contraposition is short cuts aramid fiber 10 ~ 20%, p-aramid fiber fibrid 20 ~ 40%; Modified micaceous 40 ~ 70%, add up to 100%;
(5) by mixed slurry starching drainage and formation, select ultralow dense inclined-wire form technology, screen approach flow with pressurized screen, online concentration is 0.005 ~ 0.02%; Again through squeezing with after drying, adopt three rollers hot-forming, temperature is 280 ~ 380 DEG C, linear pressure is 100 ~ 300kN/m, and roller speed is 1.0 ~ 4.0m/min, and hot pressing number of times is 1 ~ 3 time, obtain para-aramid fiber mica paper, through the baking oven of 280 ~ 320 DEG C after hot pressing, maintain insulation 3 ~ 10min, pack after rewind slitting.
Wherein, in steps in adopt aqueous medium are all deionized waters.
Embodiment 1 adopts the inventive method to prepare para-aramid fiber mica paper
Adopt ultrasonic wave process that white clouds master slice is peeled off into mica sheet, its power is 800W, time is 10h, carries out grain size grading by pulp classifier to mica sheet, in Zhao≤20 order: the ratio of 20 ~ 40 order :≤40 order grain grade proportion=1:6:3 combines, again through cationic starch modification, cationic starch mass concentration 0.01%, modification time 60min, modified micaceous slurry concentration 10%, modifiedly to rinse well, obtain modified micaceous; Adopt silane coupler to length 12mm, the p-aramid fiber staple fiber of fiber number 1.5D carries out modification, coupling agent mass concentration 3%, consumption is 0.1% of relative p-aramid fiber staple fiber absolute dry mass, modification time 10h, fully discongests dispersion, the slurry A of obtained mass concentration 0.01%; By beating degree be the p-aramid fiber fibrid of 40 ° of SR by pulp classifier, choose distribution of lengths 35 ~ 140 object fiber, the slurry B of obtained mass concentration 0.1%; According to mass fraction modified micaceous 40%, p-aramid fiber staple fiber 20%, three kinds of materials are fully mixed dispersion by the ratio of p-aramid fiber fibrid 40%; Adopt oblique net paper machine to carry out wet method to manufacture paper with pulp, online concentration 0.005%; After entering squeezing, drying and oven dry, adopt three-roller type hot press to carry out high temperature high pressure process, temperature is 280 DEG C, and linear pressure is 100kN/m, and roller speed is 1.0m/min, and hot pressing number of times is 3 times; Maintain insulation 3min through the baking oven of 280 DEG C after hot pressing, pack after rewind slitting.
Embodiment 2 adopts the inventive method to prepare para-aramid fiber mica paper
Adopt ultrasonic wave process that mica sheet is peeled off into mica sheet, its power is 1500W, time is 5h, carries out grain size grading by pulp classifier to mica sheet, in Zhao≤20 order: the ratio of 20 ~ 40 order :≤40 order grain grade proportion=2:5:3 combines, again through cationic starch modification, cationic starch mass concentration 0.05%, modification time 30min, modified micaceous slurry concentration 16%, modifiedly to rinse well, obtain modified micaceous; Adopt silane coupler to length 12mm, the p-aramid fiber staple fiber of fiber number 1.5D carries out modification, coupling agent mass concentration 5%, modification time 5h, consumption is 0.5% of relative staple fiber absolute dry mass, fully discongests dispersion, the slurry A of obtained mass concentration 0.02%; By beating degree be the aramid fiber fibrid of 50 ° of SR by pulp classifier, choose distribution of lengths 35 ~ 140 object fiber, the slurry B of obtained mass concentration 0.2%; According to mass fraction modified micaceous 65%, staple fiber 15%, three kinds of materials are fully mixed dispersion by the ratio of fibrid 30%; Adopt oblique net paper machine to carry out wet method to manufacture paper with pulp, online concentration 0.01%; After entering squeezing, drying and oven dry, adopt three-roller type hot press to carry out high temperature high pressure process, temperature is 320 DEG C, and linear pressure is 180kN/m, and roller speed is 3.0m/min, and hot pressing number of times is 2 times; Maintain insulation 6min through the baking ovens of 300 DEG C, pack after rewind slitting.
Embodiment 3 adopts the inventive method to prepare para-aramid fiber mica paper
Adopt ultrasonic wave process that mica sheet is peeled off into mica sheet, its power is 3000W, time is 1h, carries out grain size grading by pulp classifier to mica sheet, in Zhao≤20 order: the ratio of 20 ~ 40 order :≤40 order grain grade proportion=3:4:3 combines, again through cationic starch modification, cationic starch mass concentration 0.1%, modification time 10min, modified micaceous slurry concentration 20%, modifiedly to rinse well, obtain modified micaceous; Adopt silane coupler to length 12mm, the p-aramid fiber staple fiber of fiber number 1.5D carries out modification, coupling agent mass concentration 10%, modification time 1h, consumption is 1% of relative staple fiber absolute dry mass, fully discongests dispersion, the slurry A of obtained mass concentration 0.05%; By beating degree be the aramid fiber fibrid of 65 ° of SR by pulp classifier, choose distribution of lengths 35 ~ 140 object fiber, the slurry B of obtained mass concentration 0.5%; According to mass fraction modified micaceous 70%, staple fiber 10%, three kinds of materials are fully mixed dispersion by the ratio of fibrid 20%; Adopt oblique net paper machine to carry out wet method to manufacture paper with pulp, online concentration 0.02%; After entering squeezing, drying and oven dry, adopt three-roller type hot press to carry out high temperature high pressure process, temperature is 380 DEG C, and linear pressure is 300kN/m, and roller speed is 4.0m/min, and hot pressing number of times is 1 time; Maintain insulation 10min through the baking ovens of 320 DEG C, pack after rewind slitting.
Comparative example 1
By adopting the p-aramid fiber fibrid of different length distribution, other preparation condition is identical with embodiment 2.Its distribution of lengths 35 ~ 140 order of measuring is optimum range, and result is as shown in table 1.
Table 1 p-aramid fiber fibrid distribution of lengths is on the impact of mica paper performance
Comparative example 2
Do not sieve white clouds master slice grade, other condition is identical with embodiment 2.
Adopt ultrasonic wave process that mica sheet is peeled off into mica sheet, its power is 1500W, and the time is 5h, again through cationic starch modification, cationic starch mass concentration 0.05%, modification time 30min, modified micaceous slurry concentration 16%, modifiedly rinses well, obtains modified micaceous; Adopt silane coupler to length 12mm, the p-aramid fiber staple fiber of fiber number 1.5D carries out modification, coupling agent mass concentration 5%, modification time 5h, consumption is 0.5% of relative staple fiber absolute dry mass, fully discongests dispersion, the slurry A of obtained mass concentration 0.02%; By beating degree be the aramid fiber fibrid of 50 ° of SR by pulp classifier, choose distribution of lengths 35 ~ 140 object fiber, the slurry B of obtained mass concentration 0.2%; According to mass fraction modified micaceous 65%, staple fiber 15%, three kinds of materials are fully mixed dispersion by the ratio of fibrid 30%; Adopt oblique net paper machine to carry out wet method to manufacture paper with pulp, online concentration 0.01%; After entering squeezing, drying and oven dry, adopt three-roller type hot press to carry out high temperature high pressure process, temperature is 320 DEG C, and linear pressure is 180kN/m, and roller speed is 3.0m/min, and hot pressing number of times is 2 times; Maintain insulation 6min through the baking ovens of 300 DEG C, pack after rewind slitting.
Comparative example 3
Adopt muscovite and the p-aramid fiber staple fiber of not modification, other condition is identical with embodiment 2.
Adopt ultrasonic wave process that mica sheet is peeled off into mica sheet, its power is 1500W, and the time is 5h, carries out grain size grading by pulp classifier to mica sheet, in Zhao≤20 order: the ratio of 20 ~ 40 order :≤40 order grain grade proportion=2:5:3 combines, and obtains mica sheet; The p-aramid fiber staple fiber of length 12mm, fiber number 1.5D is adopted fully to discongest dispersion, the slurry A of obtained mass concentration 0.02%; By beating degree be the aramid fiber fibrid of 50 ° of SR by pulp classifier, choose distribution of lengths 35 ~ 140 object fiber, the slurry B of obtained mass concentration 0.2%; According to mass fraction modified micaceous 65%, staple fiber 15%, three kinds of materials are fully mixed dispersion by the ratio of fibrid 30%; Adopt oblique net paper machine to carry out wet method to manufacture paper with pulp, online concentration 0.01%; After entering squeezing, drying and oven dry, adopt three-roller type hot press to carry out high temperature high pressure process, temperature is 320 DEG C, and linear pressure is 180kN/m, and roller speed is 3.0m/min, and hot pressing number of times is 2 times; Maintain insulation 6min through the baking ovens of 300 DEG C, pack after rewind slitting.
The performance indications of table 2 embodiment 1 ~ 3 and comparative example 2 ~ 3 para-aramid fiber mica paper
Data as can be seen from table 2: adopt the para-aramid fiber mica paper prepared of the inventive method compared to adopting the one-tenth paper do not sieved obtained by muscovite grade in comparative example 2, its mechanical strength and dielectric properties be improved significantly; Compared to comparative example 3, mechanical strength and dielectric strength are all higher, and the enhancing of modification to mica paper performance making mica and aramid fiber clear is obvious.
Embodiment 4
Adopt ultrasonic wave process that white clouds master slice is peeled off into mica sheet, its power is 1200W, time is 3h, carries out grain size grading by pulp classifier to mica sheet, in Zhao≤20 order: the ratio of 20 ~ 40 order :≤40 order grain grade proportion=2:4:3 combines, again through cationic starch modification, cationic starch mass concentration 0.03%, modification time 20min, modified micaceous slurry concentration 12%, modifiedly to rinse well, obtain modified micaceous; Adopt silane coupler to length 4mm, the p-aramid fiber staple fiber of fiber number 1.5D carries out modification, coupling agent mass concentration 6%, consumption is 0.7% of relative p-aramid fiber staple fiber absolute dry mass, modification time 8h, fully discongests dispersion, the slurry A of obtained mass concentration 0.04%; By beating degree be the p-aramid fiber fibrid of 45 ° of SR by pulp classifier, choose distribution of lengths 35 ~ 140 object fiber, the slurry B of obtained mass concentration 0.3%; According to mass fraction modified micaceous 55%, p-aramid fiber staple fiber 20%, three kinds of materials are fully mixed dispersion by the ratio of p-aramid fiber fibrid 25%; Adopt oblique net paper machine to carry out wet method to manufacture paper with pulp, online concentration 0.015%; After entering squeezing, drying and oven dry, adopt three-roller type hot press to carry out high temperature high pressure process, temperature is 300 DEG C, and linear pressure is 200kN/m, and roller speed is 2.0m/min, and hot pressing number of times is 2 times; Maintain insulation 3min through the baking oven of 290 DEG C after hot pressing, pack after rewind slitting.
Embodiment 5
Adopt ultrasonic wave process that white clouds master slice is peeled off into mica sheet, its power is 2000W, time is 8h, carries out grain size grading by pulp classifier to mica sheet, in Zhao≤20 order: the ratio of 20 ~ 40 order :≤40 order grain grade proportion=3:5:3 combines, again through cationic starch modification, cationic starch mass concentration 0.08%, modification time 40min, modified micaceous slurry concentration 18%, modifiedly to rinse well, obtain modified micaceous; Adopt silane coupler to length 8mm, the p-aramid fiber staple fiber of fiber number 1.5D carries out modification, coupling agent mass concentration 8%, consumption is 0.3% of relative p-aramid fiber staple fiber absolute dry mass, modification time 3h, fully discongests dispersion, the slurry A of obtained mass concentration 0.03%; By beating degree be the p-aramid fiber fibrid of 55 ° of SR by pulp classifier, choose distribution of lengths 35 ~ 140 object fiber, the slurry B of obtained mass concentration 0.4%; According to mass fraction modified micaceous 50%, p-aramid fiber staple fiber 15%, three kinds of materials are fully mixed dispersion by the ratio of p-aramid fiber fibrid 35%; Adopt oblique net paper machine to carry out wet method to manufacture paper with pulp, online concentration 0.008%; After entering squeezing, drying and oven dry, adopt three-roller type hot press to carry out high temperature high pressure process, temperature is 350 DEG C, and linear pressure is 240kN/m, and roller speed is 3.0m/min, and hot pressing number of times is 1 time; Maintain insulation 3min through the baking oven of 310 DEG C after hot pressing, pack after rewind slitting.
The present invention has prepared a kind of para-aramid fiber mica paper possessing excellent mechanical strength, dielectric strength and heat-resisting quantity, for electro-mechanical arts provides high-quality new insulation material.
Mica is carried out screening purification and removes impurity by the present invention, then carries out ultrasonic wave and peels off dispersion, and selected the mica sheet of suitable grain grade proportion by pulp classifier, carry out cationic starch modification; P-aramid fiber fibrid is carried out pulling an oar and selects distribution of lengths to be 35 ~ 140 order fibers by pulp classifier; P-aramid fiber staple fiber is carried out coupling agent modified and dispersion treatment; Three kinds of raw materials are mixed in proportion and is uniformly dispersed; Adopt oblique net paper machine to carry out wet method to manufacture paper with pulp; Finally by high-temperature thermo-compression formation, obtain para-aramid fiber mica paper.
In the present invention, the overall performance of distribution of lengths to mica paper of p-aramid fiber fibrid plays conclusive effect.In mica paper structure, p-aramid fiber fibrid is as packing material, and in hot pressing, body produces plastic deformation, mica sheet and p-aramid fiber staple fiber is firmly embedded in wherein, thus improves into machinery and the dielectric strength of paper.P-aramid fiber fibrid length is too large, and it is poly-that long fiber can cause slurry to wad a quilt with cotton, and affects evenness intensity; The too little too much fiber fines of length can cause drainage difficulty, reduces paper machine efficiency.In the present invention, there is impact to the intensity of mica paper, particularly paper-forming evenness in the grain grade proportion of mica sheet.Mica sheet is a kind of solid material, can effectively fill paper hole for tiny, improves paper-forming evenness and dielectric strength, but can reduce TENSILE STRENGTH; More large stretch ofly be conducive to TENSILE STRENGTH, but dielectric strength skewness can be caused, and hot press roll surface can be damaged.Find in the present invention that high-power ultrasonics process is obvious for mica flake peeling effect, the oversize meeting of power excessive time causes mica sheet too comminuted, the power too small time is too short can affect peeling effect, power is 800 ~ 3000W, and the time is the peeling effect of mica flake under 1 ~ 10h condition and best in quality.
In the present invention, cationic starch is to mica sheet, and silane coupler obviously impact can finally become the bond strength of paper to the modification of p-aramid fiber staple fiber, but should note modifier concentration and time.Wherein cationic starch mass concentration 0.01 ~ 0.1%, modification time 10 ~ 60min; Coupling agent mass concentration 3 ~ 10%, modification time 1 ~ 10h, this is best modified condition, exceeds this scope and modified effect can be caused not good.
Find in the present invention that para-aramid fiber mica paper is after high temperature high pressure process, lower the temperature gradually again after continuing insulation, be similar to chemical fibre high-temperature hot type-approval process in textile industry, it becomes paper crystalline texture to be tending towards perfect, thus causes its mechanical strength and dielectric strength all to obtain by a relatively large margin.The too short crystallization of temperature retention time does not complete, and performance improves not enough, and temperature retention time is oversize, is lowered into paper toughness, and insulation 3 ~ 10min is optimum process condition.
In sum, according to the preparation method of a kind of para-aramid fiber mica paper of the present invention, produce with the obvious advantage in tensile strength, tearing strength, dielectric strength etc. of para-aramid fiber mica paper, be conducive to for electro-mechanical arts provides high-quality new insulation material.
Claims (10)
1. a preparation method for para-aramid fiber mica paper, is characterized in that: preparation process is as follows:
(1) the p-aramid fiber staple fiber after silane coupler modified is discongested dispersion, obtain slurry A;
(2) by beating degree be 40 ~ 65 ° of SR p-aramid fiber fibrid through screening, obtain slurry B;
(3) in mica sheet, add cationic starch solution form modified micaceous slurry and carry out modification, modifiedly to rinse well, obtain modified micaceous;
(4) slurry A, slurry B and modified micaceous are mixed, obtain mixed slurry, wherein by mass percentage, the short aramid fiber of cutting of contraposition is 10 ~ 20%, and p-aramid fiber fibrid is 20 ~ 40%, and modified micaceous is 40 ~ 70%;
(5) by mixed slurry starching drainage and formation, more hot-forming after squeezing and oven dry, obtain para-aramid fiber mica paper.
2. the preparation method of a kind of para-aramid fiber mica paper according to claim 1, is characterized in that: in step (1), the length of p-aramid fiber staple fiber is 4 ~ 12mm, fiber number 1.5D.
3. the preparation method of a kind of para-aramid fiber mica paper according to claim 1, it is characterized in that: in step (1), the mass concentration of silane coupler is 3 ~ 10%, consumption is 0.1 ~ 1% of relative staple fiber absolute dry mass, modification time 1 ~ 10h, slurry A mass concentration 0.01 ~ 0.05%.
4. the preparation method of a kind of para-aramid fiber mica paper according to claim 1, it is characterized in that: in step (2), p-aramid fiber fibrid screens through pulp classifier, screening p-aramid fiber fibrid distribution of lengths at 35 ~ 140 orders, the mass concentration 0.1 ~ 0.5% of slurry B.
5. the preparation method of a kind of para-aramid fiber mica paper according to claim 1, it is characterized in that: in step (3), mica sheet is again through cationic starch solution modification after ultrasonic wave is peeled off, and the power that ultrasonic wave is peeled off is 800 ~ 3000W, and the time is 1 ~ 10h.
6. the preparation method of a kind of para-aramid fiber mica paper according to claim 1, it is characterized in that: in step (3), mica sheet chooses proportioning for≤20 orders by screening: 20 ~ 40 orders :≤40 orders=(1 ~ 3): (4 ~ 6): after the grade combination of 3, then through cationic starch solution modification.
7. the preparation method of a kind of para-aramid fiber mica paper according to claim 1, it is characterized in that: the mass concentration 0.01 ~ 0.1% of step (3) cationic starch solution, the mass concentration of modified micaceous slurry is 10 ~ 20%, modification time 10 ~ 60min.
8. the preparation method of a kind of para-aramid fiber mica paper according to claim 1, it is characterized in that: in step (5), upper net forming adopts ultralow dense inclined-wire form, and with the online of pressurized screen screening mixed slurry, online concentration is 0.005 ~ 0.02%.
9. the preparation method of a kind of para-aramid fiber mica paper according to claim 1, it is characterized in that: in step (5), adopt three-roller type hot press to carry out hot-forming, and hot pressing temperature is 280 ~ 380 DEG C, linear pressure is 100 ~ 300kN/m, roller speed is 1.0 ~ 4.0m/min, and hot pressing number of times is 1 ~ 3 time.
10. the preparation method of a kind of para-aramid fiber mica paper according to claim 1, is characterized in that: in step (5), and the p-aramid fiber mica paper after hot pressing maintains insulation 3 ~ 10min through the baking oven of 280 ~ 320 DEG C.
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