CN105544286B - A kind of preparation method of para-aramid fiber mica paper - Google Patents
A kind of preparation method of para-aramid fiber mica paper Download PDFInfo
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- CN105544286B CN105544286B CN201510939494.4A CN201510939494A CN105544286B CN 105544286 B CN105544286 B CN 105544286B CN 201510939494 A CN201510939494 A CN 201510939494A CN 105544286 B CN105544286 B CN 105544286B
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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
-
- 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
-
- 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
-
- 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
-
- 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
Abstract
The present invention relates to a kind of preparation method of para-aramid fiber mica paper, the p-aramid fiber chopped strand after silane coupler modified is discongested first scattered, obtain slurry A；The p-aramid fiber fibrid that beating degree is 40~65 ° of SR is passed through into screening, slurry B is obtained；It is modified through mica sheet by cationic starch solution, obtains modified micaceous；Slurry A, slurry B and modified micaceous is well mixed, mixed slurry is obtained, wherein by mass percentage, the chopped aramid fiber of contraposition is 10~20%, and p-aramid fiber fibrid is 20~40%, and mica sheet is 40~70%；It is hot-forming by mixed slurry starching drainage and formation, then after squeezing and drying, obtain para-aramid fiber mica paper.The para-aramid fiber mica paper that the present invention is manufactured paper with pulp by fibre fractionation and modification, wet method, prepared by the technique such as hot-forming, formation of sheet preferably, possesses excellent mechanical strength, dielectric breakdown strength and heat-resistant stable.
Description
【Technical field】
The invention belongs to paper industry and insulation industry crossing domain, and in particular to a kind of para-aramid fiber mica paper
Preparation method.
【Background technology】
With petering out for high-quality mica resource, the mica paper prepared using mica flake possesses nontoxic, tasteless, anti-
Burn into is ageing-resistant, dielectric strength fluctuates the features such as small, corona inception voltage is high and stable, is optimal high temperature resistant in the world
Insulating materials.Mica paper is tiny mica sheet manufactures paper with pulp the paper-based insulation material being prepared for primary raw material through modern paper wet method
Material, it is shaped mainly by the Van der Waals force and electrostatic force between mica sheet, thus it is smaller to cause into the mechanical strength of paper,
It is difficult to meet use requirement and low production efficiency.
In order to improve the mechanical strength of mica paper, and ensure its insulating properties, the reinforcement of current use is mainly
Using meta-aramid fibers as the reinforcing material of mica paper, this is also the important directions of high-quality combined mica paper insulation development.
Patent《Fiber-mica paper and its production method》, publication number：CN102760513A, publication date：2012.10.31, using 6~
The mica of 15% aramid fiber 1313,85~94% is raw material, is prepared by cylinder mould machine with higher dielectric strength
Mica paper；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, mica paper is strengthened using 3~15% chopped strands, its mica is using chemistry
Slurrying is calcined, its Strength of Mica-paper is improved；Patent《A kind of method of regenerating mica paper through reinforcement of aramid precipitated fiber》, it is open
Number CN101748647A, publication date：2010.06.23, use 2~20% fibrids with the mica through hydro-pulping for original
Material, enhances mica paper mechanical performance, improves production efficiency.
What above-mentioned patent was introduced is to strengthen the method for mica paper using meta-aramid fibers, is improved to a certain extent
The mechanical performance or dielectric strength of mica paper, however, because the heat resistance of meta-aramid fibers body is limited, it makes for a long time
It it is 200 DEG C with temperature, it is difficult to reach the requirement of C class B insulations grade and above material, it is difficult to meet the use of high-end field.With
Large-size machine develops to miniaturization, particularly the equipment such as wind-powered electricity generation, nuclear power, high ferro traction electric machine require motor volume it is small,
It is dielectric strength height, service life length, safe and reliable, therefore higher requirement is it is also proposed to mica paper, urgent need prepares machinery
Performance and the more excellent high-quality mica paper of dielectric strength.
【The content of the invention】
It is an object of the invention to overcome problems of the prior art, there is provided a kind of para-aramid fiber mica paper
Preparation method, uses p-aramid fiber chopped strand, p-aramid fiber fibrid and mica sheet for raw material, the p-aramid fiber prepared
Fiber-mica paper mechanical performance and dielectric strength are protruded, and thermal property is excellent.
In order to achieve the above object, the present invention is adopted the following technical scheme that：
Preparation process is as follows：
(1) the p-aramid fiber chopped strand after silane coupler modified is discongested scattered, obtains slurry A；
(2) the p-aramid fiber fibrid that beating degree is 40~65 ° of SR through and screening, obtain slurry B；
(3) cationic starch solution is added into mica sheet to form modified micaceous slurry and be modified, it is modified to rinse dry
Only, modified micaceous is obtained；
(4) it is slurry A, slurry B and modified micaceous is well mixed, mixed slurry is obtained, wherein by mass percentage,
The chopped aramid fiber 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, then after squeezing and drying it is hot-forming, obtain para-aramid fiber
Mica paper.
Further, the length of p-aramid fiber chopped strand is 4~12mm, fiber number 1.5D in step (1).
Further, in step (1), the mass concentration of silane coupler is 3~10%, and consumption is that relative chopped strand is exhausted
The 0.1~1% of dry mass, 1~10h of modification time, slurry A mass concentrations 0.01~0.05%.
Further, in step (2), the screened instrument screening of p-aramid fiber fibrid, the p-aramid fiber precipitating of screening is fine
Distribution of lengths is tieed up in 35~140 mesh, slurry B mass concentration 0.1~0.5%.
Further, in step (3), mica sheet is modified by cationic starch solution again after ultrasonic wave is peeled off, and is surpassed
The power that sound wave is peeled off is 800~3000W, and the time is 1~10h.
Further, mica sheet chooses proportioning for≤20 mesh by sieving in step (3)：20~40 mesh：≤ 40 mesh=(1
~3)：(4~6)：After 3 grade combination, then by cationic starch solution modification.
Further, the mass concentration 0.01~0.1% of step (3) cationic starch solution, modified micaceous slurry
Mass concentration is 10~20%, 10~60min of modification time.
Further, in step (5), upper net forming uses ultralow dense inclined-wire form, is screened with pressurized screen on mixed slurry
Net, online concentration is 0.005~0.02%.
Further, it is hot-forming using the progress of three-roller type hot press in step (5), and hot pressing temperature is 280~380
DEG C, line 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 by 280~320 DEG C of baking oven
3~10min.
Compared with prior art, the present invention has following beneficial technique effect：
The present invention uses p-aramid fiber chopped strand, p-aramid fiber fibrid and mica sheet for raw material, is sieved by fiber
Point and modified, wet method is manufactured paper with pulp, the technique such as hot-forming prepares the para-aramid fiber mica paper of high-quality, wherein p-aramid fiber sinks
It is a kind of para-aramid fiber of new synthesis to analyse fiber, and compared to traditional PPTA-pulp fiber, it has more excellent
Solution dispersion performance and composite strengthening effect, and thermal property is stable, and temperature of initial decomposition is up to 550 DEG C；The present invention is adopted
Strengthen mica paper with p-aramid fiber fibrid and p-aramid fiber chopped strand, but due to p-aramid fiber fibrid and the fibre that is chopped
The surface inertness of dimension is higher, and hot pressing is difficult to produce melting, and the adhesion between fiber and mica sheet is weaker, causes into paper
Manufacture paper with pulp difficult and low strength, therefore the property of para-aramid fiber mica paper is strengthened by mica sheet and fibre modification processing
Can, the excellent specific property of two kinds of materials of para-aramid fiber and mica is combined, formation of sheet preferably, possesses excellent machinery strong
Degree, dielectric breakdown strength and heat-resistant stable, tensile strength is up to 36.6N/cm, and tearing strength is up to 1.7N, and dielectric is strong
Degree is used for a long time temperature and reaches more than 300 DEG C up to 25.7kV/mm.The inventive method solves that Strength of Mica-paper is low, insulating properties
Can be poor, and the problem of meta-aramid fibers mica paper hard to bear high temperature, and the evenness of paper is effectively increased into, it is that electro-mechanical arts are carried
High-quality new insulation material has been supplied, has been the important channel for preparing high-quality NEW TYPE OF COMPOSITE mica insulation paper, with great city
Field prospect and realistic meaning.
【Brief description of the drawings】
Fig. 1 is the process chart of the present invention.
【Embodiment】
The present invention is described in further details below in conjunction with the accompanying drawings.
Referring to Fig. 1, a kind of preparation method of para-aramid fiber mica paper of the invention is specifically implemented according to following steps：
(1) 4~12mm of length is used, fiber number 1.5D p-aramid fiber chopped strand passes through silane coupler modified, silane
The mass concentration 3~10% of coupling agent, silane coupler consumption is the 0.1~1% of relative chopped strand absolute dry mass, when modified
Between 1~10h, fully discongest scattered, obtain slurry A, slurry A mass concentrations 0.01~0.05%；
(2) the p-aramid fiber fibrid that beating degree is 40~65 ° of SR is carried out by screening instrument, the contraposition virtue filtered out
Synthetic fibre fibrid distribution of lengths is 35~140 mesh, and dilution is scattered to obtain slurry B, slurry B mass concentration 0.1~0.5%；
(3) peeled off using white clouds master slice or sericite piece by ultrasonic wave and obtain mica sheet, treatment conditions are：Power is
800~3000W, the time is 1~10h, and mica sheet chooses suitable grade by pulp classifier, An the mesh of Zhao≤20:20~40 mesh:≧40
Mesh grain grade proportion=(1~3)：(4~6)：After 3 ratio is combined, adds cationic starch solution and form modified micaceous
Slurry is modified, the mass concentration 0.01~0.1% of cationic starch solution, and the mass concentration 10 of modified micaceous slurry~
20%, 10~60min of modification time；It is modified to rinse well, obtain modified micaceous；
(4) it is slurry A, slurry B and modified micaceous is well mixed, obtain mixed slurry；Wherein, the mixing of three kinds of materials
Mass percent is：The chopped aramid fiber 10~20% of contraposition, p-aramid fiber fibrid 20~40%；Modified micaceous 40~
70%, add up to 100%；
(5) by mixed slurry starching drainage and formation, from ultralow dense inclined-wire form technology, screened with pressurized screen on slurry
Net, online concentration is 0.005~0.02%；Hot-forming using three rollers again after squeezing and drying, temperature is 280~380
DEG C, line pressure is 100~300kN/m, and roller speed is 1.0~4.0 m/min, and hot pressing number of times is 1~3 time, obtains p-aramid fiber fine
Mica paper is tieed up, by 280~320 DEG C of baking oven after hot pressing, 3~10min of insulation is maintained, is packed after rewind slitting.
Wherein, the aqueous medium used in all steps is deionized water.
Embodiment 1 prepares para-aramid fiber mica paper using the inventive method
White clouds master slice is peeled off into by mica sheet using ultrasonication, its power is 800W, and the time is 10h, pass through screening
Instrument carries out grain size grading to mica sheet, An the mesh of Zhao≤20:20~40 mesh:≤ 40 mesh grain grade proportion=1:6:3 ratio carry out group
Close, then be modified through cationic starch, cationic starch mass concentration 0.01%, modification time 60min, modified micaceous slurry concentration
10%, it is modified to rinse well, obtain modified micaceous；Using silane coupler to length 12mm, fiber number 1.5D contraposition virtue
Synthetic fibre chopped strand is modified, coupling agent mass concentration 3%, and consumption is relative p-aramid fiber chopped strand absolute dry mass
0.1%, modification time 10h, fully discongest scattered, the slurry A of obtained mass concentration 0.01%；By pair that beating degree is 40 ° of SR
Position aramid fiber fibrid chooses the fiber of the mesh of distribution of lengths 35~140 by pulp classifier, and the slurry of mass concentration 0.1% is made
B；According to mass fraction modified micaceous 40%, p-aramid fiber chopped strand 20%, the ratio of p-aramid fiber fibrid 40%
Three kinds of materials are sufficiently mixed scattered；Wet method is carried out using oblique net paper machine to manufacture paper with pulp, concentration 0.005% of surfing the Net；Entered squeezing, drying
After drying, high temperature high pressure process is carried out using three-roller type hot press, temperature is 280 DEG C, and line pressure is 100kN/m, and roller speed is
1.0m/min, hot pressing number of times is 3 times；Packed after maintaining insulation 3min, rewind slitting by 280 DEG C of baking oven after hot pressing.
Embodiment 2 prepares para-aramid fiber mica paper using the inventive method
Mica sheet is peeled off into by mica sheet using ultrasonication, its power is 1500W, and the time is 5h, passes through pulp classifier
Grain size grading is carried out to mica sheet, An the mesh of Zhao≤20:20~40 mesh:≤ 40 mesh grain grade proportion=2:5:3 ratio is combined,
It is modified again through cationic starch, cationic starch mass concentration 0.05%, modification time 30min, modified micaceous slurry concentration
16%, it is modified to rinse well, obtain modified micaceous；Using silane coupler to length 12mm, fiber number 1.5D contraposition virtue
Synthetic fibre chopped strand is modified, coupling agent mass concentration 5%, modification time 5h, and consumption is relative chopped strand absolute dry mass
0.5%, fully discongest scattered, the slurry A of obtained mass concentration 0.02%；Beating degree is led to for 50 ° of SR aramid fiber fibrid
Pulp classifier is crossed, the fiber of the mesh of distribution of lengths 35~140 is chosen, the slurry B of mass concentration 0.2% is made；Change according to mass fraction
Property mica sheet 65%, three kinds of materials are sufficiently mixed scattered by chopped strand 15%, the ratio of fibrid 30%；Using inclined wire paper
Machine carries out wet method and manufactured paper with pulp, concentration 0.01% of surfing the Net；Entered after squeezing, drying and drying, high temperature is carried out using three-roller type hot press
HIGH PRESSURE TREATMENT, temperature is 320 DEG C, and line pressure is 180kN/m, and roller speed is 3.0m/min, and hot pressing number of times is 2 times；By 300 DEG C
Baking oven is packed after maintaining insulation 6min, rewind slitting.
Embodiment 3 prepares para-aramid fiber mica paper using the inventive method
Mica sheet is peeled off into by mica sheet using ultrasonication, its power is 3000W, and the time is 1h, passes through pulp classifier
Grain size grading is carried out to mica sheet, An the mesh of Zhao≤20:20~40 mesh:≤ 40 mesh grain grade proportion=3:4:3 ratio is combined,
It is modified again through cationic starch, cationic starch mass concentration 0.1%, modification time 10min, modified micaceous slurry concentration
20%, it is modified to rinse well, obtain modified micaceous；Using silane coupler to length 12mm, fiber number 1.5D contraposition virtue
Synthetic fibre chopped strand is modified, coupling agent mass concentration 10%, modification time 1h, and consumption is relative chopped strand absolute dry mass
1%, fully discongest scattered, the slurry A of obtained mass concentration 0.05%；Beating degree is passed through for 65 ° of SR aramid fiber fibrid
Pulp classifier, chooses the fiber of the mesh of distribution of lengths 35~140, and the slurry B of mass concentration 0.5% is made；It is modified according to mass fraction
Mica sheet 70%, three kinds of materials are sufficiently mixed scattered by chopped strand 10%, the ratio of fibrid 20%；Using oblique net paper machine
Carry out wet method to manufacture paper with pulp, concentration 0.02% of surfing the Net；Entered after squeezing, drying and drying, it is high to carry out high temperature using three-roller type hot press
Pressure processing, temperature is 380 DEG C, and line pressure is 300kN/m, and roller speed is 4.0m/min, and hot pressing number of times is 1 time；By 320 DEG C of baking
Case is packed after maintaining insulation 10min, rewind slitting.
Comparative example 1
By using the p-aramid fiber fibrid of different length distribution, other preparation conditions are same as Example 2.
Its mesh of distribution of lengths 35~140 of measuring is optimum range, as a result as shown in table 1.
Influence of the p-aramid fiber fibrid distribution of lengths of table 1 to mica paper performance
Comparative example 2
Muscovite piece grade is not sieved, and other conditions are same as Example 2.
Mica sheet is peeled off into by mica sheet using ultrasonication, its power is 1500W, and the time is 5h, then through cation
Starch conversion, cationic starch mass concentration 0.05%, modification time 30min, modified micaceous slurry concentration 16%, modified backlash
Wash clean, obtains modified micaceous；Using silane coupler to length 12mm, fiber number 1.5D p-aramid fiber chopped strand is carried out
It is modified, coupling agent mass concentration 5%, modification time 5h, consumption is the 0.5% of relative chopped strand absolute dry mass, is fully discongested
It is scattered, the slurry A of mass concentration 0.02% is made；The aramid fiber fibrid that beating degree is 50 ° of SR is passed through into pulp classifier, selection length
The fiber of degree 35~140 mesh of distribution, is made the slurry B of mass concentration 0.2%；It is short according to mass fraction modified micaceous 65%
Cut fiber 15%, three kinds of materials are sufficiently mixed scattered by the ratio of fibrid 30%；Wet method is carried out using oblique net paper machine to manufacture paper with pulp,
Online concentration 0.01%；Entered after squeezing, drying and drying, high temperature high pressure process is carried out using three-roller type hot press, temperature is
320 DEG C, line pressure is 180kN/m, and roller speed is 3.0m/min, and hot pressing number of times is 2 times；Insulation is maintained by 300 DEG C of baking ovens
Packed after 6min, rewind slitting.
Comparative example 3
Using not modified muscovite and p-aramid fiber chopped strand, other conditions are same as Example 2.
Mica sheet is peeled off into by mica sheet using ultrasonication, its power is 1500W, and the time is 5h, passes through pulp classifier
Grain size grading is carried out to mica sheet, An the mesh of Zhao≤20:20~40 mesh:≤ 40 mesh grain grade proportion=2:5:3 ratio is combined,
Obtain mica sheet；Using length 12mm, fiber number 1.5D p-aramid fiber chopped strand fully discongests scattered, obtained mass concentration
0.02% slurry A；The aramid fiber fibrid that beating degree is 50 ° of SR is passed through into pulp classifier, the selection purpose of distribution of lengths 35~140
Fiber, is made the slurry B of mass concentration 0.2%；According to mass fraction modified micaceous 65%, chopped strand 15%, precipitating is fine
Three kinds of materials are sufficiently mixed scattered by the ratio of dimension 30%；Wet method is carried out using oblique net paper machine to manufacture paper with pulp, concentration 0.01% of surfing the Net；Enter
Cross after squeezing, drying and drying, high temperature high pressure process is carried out using three-roller type hot press, temperature is 320 DEG C, and line pressure is
180kN/m, roller speed is 3.0m/min, and hot pressing number of times is 2 times；Wrapped after maintaining insulation 6min, rewind slitting by 300 DEG C of baking ovens
Dress.
The performance indications of the embodiment 1~3 of table 2 and the para-aramid fiber mica paper of comparative example 2~3
Data can be seen that from table 2：The para-aramid fiber mica paper prepared using the inventive method is compared to contrast
In example 2 using do not sieve obtained by muscovite grade into paper, its mechanical strength and dielectric properties be improved significantly；Compared to
Comparative example 3, mechanical strength and dielectric strength are higher, illustrate the modification of muscovite and aramid fiber to mica paper performance
Enhancing is obvious.
Embodiment 4
White clouds master slice is peeled off into by mica sheet using ultrasonication, its power is 1200W, and the time is 3h, pass through screening
Instrument carries out grain size grading to mica sheet, An the mesh of Zhao≤20:20~40 mesh:≤ 40 mesh grain grade proportion=2:4:3 ratio carry out group
Close, then be modified through cationic starch, cationic starch mass concentration 0.03%, modification time 20min, modified micaceous slurry concentration
12%, it is modified to rinse well, obtain modified micaceous；Using silane coupler to length 4mm, fiber number 1.5D p-aramid fiber
Chopped strand is modified, coupling agent mass concentration 6%, and consumption is the 0.7% of relative p-aramid fiber chopped strand absolute dry mass,
Modification time 8h, fully discongests scattered, the slurry A of obtained mass concentration 0.04%；Beating degree is sunk for 45 ° of SR p-aramid fiber
Fiber is analysed by pulp classifier, the fiber of the mesh of distribution of lengths 35~140 is chosen, the slurry B of mass concentration 0.3% is made；According to matter
Measure fraction modified micaceous 55%, p-aramid fiber chopped strand 20%, the ratio of p-aramid fiber fibrid 25% is by three kinds of materials
Material is sufficiently mixed scattered；Wet method is carried out using oblique net paper machine to manufacture paper with pulp, concentration 0.015% of surfing the Net；Entered squeezing, drying and drying
Afterwards, high temperature high pressure process is carried out using three-roller type hot press, temperature is 300 DEG C, line pressure is 200kN/m, roller speed is 2.0m/
Min, hot pressing number of times is 2 times；Packed after maintaining insulation 3min, rewind slitting by 290 DEG C of baking oven after hot pressing.
Embodiment 5
White clouds master slice is peeled off into by mica sheet using ultrasonication, its power is 2000W, and the time is 8h, pass through screening
Instrument carries out grain size grading to mica sheet, An the mesh of Zhao≤20:20~40 mesh:≤ 40 mesh grain grade proportion=3:5:3 ratio carry out group
Close, then be modified through cationic starch, cationic starch mass concentration 0.08%, modification time 40min, modified micaceous slurry concentration
18%, it is modified to rinse well, obtain modified micaceous；Using silane coupler to length 8mm, fiber number 1.5D p-aramid fiber
Chopped strand is modified, coupling agent mass concentration 8%, and consumption is the 0.3% of relative p-aramid fiber chopped strand absolute dry mass,
Modification time 3h, fully discongests scattered, the slurry A of obtained mass concentration 0.03%；Beating degree is sunk for 55 ° of SR p-aramid fiber
Fiber is analysed by pulp classifier, the fiber of the mesh of distribution of lengths 35~140 is chosen, the slurry B of mass concentration 0.4% is made；According to matter
Measure fraction modified micaceous 50%, p-aramid fiber chopped strand 15%, the ratio of p-aramid fiber fibrid 35% is by three kinds of materials
Material is sufficiently mixed scattered；Wet method is carried out using oblique net paper machine to manufacture paper with pulp, concentration 0.008% of surfing the Net；Entered squeezing, drying and drying
Afterwards, high temperature high pressure process is carried out using three-roller type hot press, temperature is 350 DEG C, line pressure is 240kN/m, roller speed is 3.0m/
Min, hot pressing number of times is 1 time；Packed after maintaining insulation 3min, rewind slitting by 310 DEG C of baking oven after hot pressing.
The present invention is prepared for a kind of para-aramid fiber cloud for possessing excellent mechanical strength, dielectric strength and heat-resisting quantity
Female paper, high-quality new insulation material is provided for electro-mechanical arts.
Mica is carried out screening purification and goes the removal of impurity by the present invention, and then the stripping of progress ultrasonic wave is scattered, and passes through pulp classifier
The mica sheet of suitable grain grade proportion is selected, cationic starch modification is carried out；P-aramid fiber fibrid is beaten and passed through
Pulp classifier selection distribution of lengths is 35~140 mesh fibers；P-aramid fiber chopped strand is subjected to coupling agent modified and decentralized processing；
Three kinds of raw materials are mixed in proportion and are uniformly dispersed；Wet method is carried out using oblique net paper machine to manufacture paper with pulp；Most afterwards through high-temperature thermo-compression formation, obtain
Para-aramid fiber mica paper.
In the present invention, the distribution of lengths of p-aramid fiber fibrid plays conclusive work to the overall performance of mica paper
With.In mica paper structure, p-aramid fiber fibrid is as packing material, and body produces plastic deformation in hot pressing, will
Mica sheet and p-aramid fiber chopped strand are firmly inlayed wherein, so as to improve into the machinery and dielectric strength of paper.P-aramid fiber
Fibrid length is too big, and long fibre can cause slurry wadding poly-, influence evenness intensity；The too small excessive fiber fines of length can cause
Drainage is difficult, reduces paper machine efficiency.In the present invention, the grain grade proportion of mica sheet exists on the intensity of mica paper to be influenceed, particularly
Paper-forming evenness.Mica sheet is a kind of solid material, and tiny can effectively fill paper hole, improves paper-forming evenness and dielectric is strong
Degree, but tensile strength can be reduced；Larger piece is conducive to tensile strength, but can cause dielectric strength skewness, and can damage
Hot press roll surface.Find that high-power ultrasonics processing is obvious for mica flake peeling effect in the present invention, the power excessive time
Oversize mica sheet to be caused excessively comminuted, the power too small time is too short to influence peeling effect, and power is 800~3000W, when
Between be the peeling effect of mica flake and best in quality under the conditions of 1~10h.
In the present invention, cationic starch is to mica sheet, and silane coupler can be obvious to the modified of p-aramid fiber chopped strand
The final bond strength into paper of influence, it should be noted that modifier concentration and time.Wherein cationic starch mass concentration 0.01
~0.1%, 10~60min of modification time；Coupling agent mass concentration 3~10%, 1~10h of modification time, this is optimal modified bar
Part, can cause modified effect not good beyond the scope.
Find that para-aramid fiber mica paper after high temperature high pressure process, gradually drops again after lasting insulation in the present invention
Temperature, similar to chemical fibre high temperature heat-setting process in textile industry, it tends to be perfect into paper crystalline texture, so as to cause its machine
Tool intensity and dielectric strength are obtained by a relatively large margin.The too short crystallization of soaking time is not completed, and performance improves not enough, and soaking time is too
Long then reduce into paper toughness, 3~10min of insulation is optimum process condition.
In summary, according to a kind of preparation method of para-aramid fiber mica paper of the invention, p-aramid fiber is produced fine
Tie up mica paper with the obvious advantage in terms of tensile strength, tearing strength, dielectric strength, be conducive to providing height for electro-mechanical arts
Quality new insulation material.
Claims (8)
1. a kind of preparation method of para-aramid fiber mica paper, it is characterised in that：Preparation process is as follows：
(1) the p-aramid fiber chopped strand after silane coupler modified is discongested scattered, obtains slurry A；
(2) the p-aramid fiber fibrid that beating degree is 40~65 ° of SR is screened by pulp classifier, the p-aramid fiber precipitating of screening
Fiber length distribution obtains the slurry B of mass concentration 0.1~0.5% in 35~140 mesh；
(3) cationic starch solution is added into mica sheet to form modified micaceous slurry and be modified, it is modified to rinse well, obtain
To modified micaceous；
(4) it is slurry A, slurry B and modified micaceous is well mixed, mixed slurry is obtained, wherein by mass percentage, contraposition
The aramid fiber that is chopped 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, then after squeezing and drying it is hot-forming, obtain para-aramid fiber mica
Paper；
In step (5), the p-aramid fiber mica paper after hot pressing maintains 3~10min of insulation by 280~320 DEG C of baking oven.
2. a kind of preparation method of para-aramid fiber mica paper according to claim 1, it is characterised in that：Step (1)
The length of middle p-aramid fiber chopped strand is 4~12mm, fiber number 1.5D.
3. a kind of preparation method of para-aramid fiber mica paper according to claim 1, it is characterised in that：Step (1)
In, the mass concentration of silane coupler is 3~10%, and consumption is the 0.1~1% of relative chopped strand absolute dry mass, when modified
Between 1~10h, slurry A mass concentrations 0.01~0.05%.
4. a kind of preparation method of para-aramid fiber mica paper according to claim 1, it is characterised in that：Step (3)
In, mica sheet is modified by cationic starch solution again after ultrasonic wave is peeled off, the power that ultrasonic wave is peeled off for 800~
3000W, the time is 1~10h.
5. a kind of preparation method of para-aramid fiber mica paper according to claim 1, it is characterised in that：Step (3)
Middle mica sheet chooses proportioning for≤20 mesh by sieving：20~40 mesh：≤ 40 mesh=(1~3)：(4~6)：3 grade combination
Afterwards, then by cationic starch solution it is modified.
6. a kind of preparation method of para-aramid fiber mica paper according to claim 1, it is characterised in that：Step (3)
The mass concentration 0.01~0.1% of cationic starch solution, the mass concentration of modified micaceous slurry is 10~20%, when modified
Between 10~60min.
7. a kind of preparation method of para-aramid fiber mica paper according to claim 1, it is characterised in that：Step (5)
In, upper net forming use ultralow dense inclined-wire form, with pressurized screen screening mixed slurry surf the Net, online concentration be 0.005~
0.02%.
8. a kind of preparation method of para-aramid fiber mica paper according to claim 1, it is characterised in that：Step (5)
Middle use three-roller type hot press progress is hot-forming, and hot pressing temperature is 280~380 DEG C, and line pressure is 100~300kN/m, roller
Speed is 1.0~4.0m/min, and hot pressing number of times is 1~3 time.
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| CN115341410B (en) * | 2022-09-14 | 2023-06-02 | 平江县盛盈云母工业有限公司 | Composite mica paper |
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