CN105568750B - Para-aramid fiber mica extrusion coating paper and its production method - Google Patents
Para-aramid fiber mica extrusion coating paper and its production method Download PDFInfo
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- CN105568750B CN105568750B CN201510939617.4A CN201510939617A CN105568750B CN 105568750 B CN105568750 B CN 105568750B CN 201510939617 A CN201510939617 A CN 201510939617A CN 105568750 B CN105568750 B CN 105568750B
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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
- D21H13/44—Flakes, e.g. mica, vermiculite
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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 present invention relates to para-aramid fiber mica extrusion coating paper and its production method, including p-aramid fiber chopped strand 10~20%, p-aramid fiber fibrid 20~40% and mica sheet 40~70%, by preparing the mica sheet slurry that mass concentration is 1~6%, the p-aramid fiber fibrid slurry mixing that the p-aramid fiber chopped strand slurry and mass concentration that mass concentration is 0.01~0.05% are 0.05~0.5% is uniformly dispersed, manufactured paper with pulp shaping through wet method, after drying para-aramid fiber mica extrusion coating paper is obtained through hot pressing, gained extrusion coating paper is quantitative low, porosity is small, possesses excellent mechanical strength, and ensureing mica extrusion coating paper mechanical strength, while dielectric strength, significantly improve its heat-resistant stable, preparation process is simple.
Description
【Technical field】
The invention belongs to insulating materials field, and in particular to para-aramid fiber mica extrusion coating paper and its production method.
【Background technology】
China's mica mineral products contain abundant, but relatively low in the process utilization rate of raw ore, so as to produce and have accumulated big
The mica flake slag of amount, the mica paper being prepared using the modern paper wet method technology of manufacturing paper with pulp possesses nontoxic, tasteless, anti-corruption
Erosion, ageing-resistant and excellent insulating properties and high-temperature stability, are optimal high-temperature insulation materials in the world.Mica paper
Shaping 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, difficult
To meet use requirement and low production efficiency.
The current reinforcement used is mainly the reinforcing material using aramid fiber as mica paper.Patent《Cloud of fibers
Female paper and its production method》, publication number：CN102760513A, publication date：2012.10.31, it is fine using 6~15% aramid fiber
The mica of dimension 1313,85~94% is raw material, and the mica paper with higher dielectric strength is prepared 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, mica paper is strengthened using 3~15% chopped strands, its mica is using chemistry calcining slurrying, its Strength of Mica-paper
It is improved；Patent《A kind of method of regenerating mica paper through reinforcement of aramid precipitated fiber》, publication number CN101748647A, publication date
Phase：2010.06.23,2~20% fibrids are used, for raw material, to enhance mica paper mechanicalness with the mica through hydro-pulping
Can, improve 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, lightening direction, and the particularly equipment such as wind-powered electricity generation, nuclear power, high ferro traction electric machine requires motor
It is small volume, dielectric strength height, service life length, safe and reliable, therefore higher requirement is it is also proposed to mica paper, it is badly in need of 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 compound there is provided a kind of para-aramid fiber mica
Paper and its production method, the mechanical performance and dielectric strength of obtained para-aramid fiber mica extrusion coating paper are protruded, calorifics
Can be excellent.
In order to achieve the above object, extrusion coating paper of the present invention is adopted the following technical scheme that：
Including p-aramid fiber chopped strand 10~20%, p-aramid fiber fibrid 20~40% and mica sheet 40~
70%.
Further, the length of p-aramid fiber chopped strand is 4~12mm, fiber number 2D.
Further, the distribution of lengths of p-aramid fiber fibrid is 35~140 mesh.
Further, mica sheet is white clouds master slice or sericite piece, and thickness degree≤1.6mm.
The technical scheme of production method of the present invention is：
(1) preparation of mica sheet slurry：Mica flake is taken to carry out impurity elimination processing, then using ultrasonication by mica flake
Mica sheet is peeled off into, and the mica sheet slurry for being configured to that mass concentration is 1~6% that adds water；
(2) p-aramid fiber chopped strand is scattered：P-aramid fiber chopped strand is dispersed in water, relative raw material is added exhausted
After the polyethylene oxide solutions of dry gross mass 0.3~1.0%, fully discongest and be uniformly dispersed, obtain mass concentration for 0.01~
0.05% p-aramid fiber chopped strand slurry；
(3) mashing of p-aramid fiber fibrid：P-aramid fiber fibrid is beaten, being configured to mass concentration is
0.05~0.5% p-aramid fiber fibrid slurry；
(4) mica sheet slurry, p-aramid fiber chopped strand slurry and p-aramid fiber fibrid slurry are mixed scattered equal
Even, wherein by mass percentage, p-aramid fiber chopped strand is 10~20%, p-aramid fiber fibrid is 20~40%,
Mica sheet is 40~70%；Paper machine approach system is then fed into, mass concentration is added in the header box of paper machine approach system is
0.05~1% PAMC solution, consumption is relative raw material over dry gross mass 0.01~0.2%, is well mixed
Obtain paper pulp；
(5) paper pulp is manufactured paper with pulp shaping through wet method, and para-aramid fiber mica extrusion coating paper is obtained through hot pressing after drying；
Wherein, 100% is amounted to the p-aramid fiber chopped strand in step (4), p-aramid fiber fibrid and mica sheet
For raw material over dry gross mass benchmark.
Further, the ultrasonication condition of mica flake is in step (1)：Power is 800~3000W, and the time is 1
~10h.
Further, the mass concentration of polyethylene oxide solutions is 0.03~0.10% in step (2).
Further, the beating degree of p-aramid fiber fibrid is 40~65 ° of SR in step (3).
Further, wet method is carried out using oblique net paper machine in step (5) to manufacture paper with pulp shaping, and online concentration for 0.005~
0.02%.
Further, hot pressing is carried out using three-roller type hot press in step (5), and hot pressing technique is：Temperature is 280
DEG C~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；And after hot pressing
Para-aramid fiber mica extrusion coating paper maintains 3~10min of insulation by 280~320 DEG C of baking oven.
Compared with prior art, the present invention has following beneficial technique effect：
Para-aramid fiber mica of the present invention is combined paper material and uses p-aramid fiber chopped strand, p-aramid fiber fibrid
And mica sheet, gained extrusion coating paper is quantitative low, and porosity is small, possesses excellent mechanical strength, and ensureing mica extrusion coating paper machine
While tool intensity, dielectric strength, the tensile strength for significantly improving extrusion coating paper in its heat-resistant stable, the present invention is reachable
30.6N/cm, tearing strength is up to 1.4N, and dielectric strength is up to 21.7kV/mm, and temperature of initial decomposition is up to 545 DEG C even
550℃。
Manufactured paper with pulp in production method of the present invention by wet method, the technique such as hot-forming prepares para-aramid fiber mica and is combined
Paper, preparation process is simple；Wherein p-aramid fiber chopped strand plays main humidification as framework material；P-aramid fiber
Fibrid is a kind of new synthesis para-aramid fiber, and compared to traditional pulp fibers, it has excellent solution dispersion
Can and composite strengthening effect, and thermal property is stable, and it is as packing material, and body produces plastic deformation in hot pressing,
Mica sheet and p-aramid fiber chopped strand are firmly inlayed wherein, so as to improve into the machinery and dielectric strength of paper, solved
Conventional composite Strength of Mica-paper is low, high-temperature insulation poor performance the problem of, and effectively increase into by mica sheet the evenness of paper
And dielectric strength, provide high-quality new insulation material for electro-mechanical arts；The present invention combines para-aramid fiber and mica
The excellent specific property of two kinds of materials, thus be high using p-aramid fiber fibrid and p-aramid fiber chopped strand enhancing mica paper
The important channel of quality NEW TYPE OF COMPOSITE mica paper insulation development, with great market prospects 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.
The invention provides para-aramid fiber mica extrusion coating paper and its production method, its raw material is according to following mass ratio
Composition：P-aramid fiber chopped strand 10~20%, p-aramid fiber fibrid 20~40%, mica sheet 40~70% is amounted to
100%.
Wherein, the length of p-aramid fiber chopped strand is 4~12mm, fiber number 2D, the length point of p-aramid fiber fibrid
Cloth is 35~140 mesh, and mica sheet is white clouds master slice or sericite piece, and thickness degree≤1.6mm.
Referring to Fig. 1, the production method of para-aramid fiber mica extrusion coating paper of the present invention comprises the following steps：
(1) preparation of mica sheet slurry：Selection by winnowing mica flake, removes uncomfortable air-dried mica, scale mica, the blotchy manufactured paper with pulp
The impurity such as mica and wood chip, the impurity such as tiny silt is further removed through pressurized screen, then use power for the super of 800~3000W
1~10h of sonicated, mica sheet is peeled off into by mica flake, and mica sheet is configured to the slurry of mass concentration 1~6%；
(2) p-aramid fiber chopped strand is scattered：It is 4~12mm, fiber number 2D p-aramid fiber chopped strand point by length
It is dispersed in water, adds 0.3~1% dispersant polyethylene oxide solutions of relative raw material over dry gross mass, the polyoxy of addition
The mass concentration for changing vinyl solution is 0.03~0.10%, is fully discongested and is uniformly dispersed using trough-style pulp beater, obtains contraposition virtue
Synthetic fibre chopped strand slurry, stock quality concentration is 0.01~0.05%；
(3) mashing of p-aramid fiber fibrid：P-aramid fiber fibrid is beaten by disc mill, beating degree
For 40~65 ° of SR, the fiber of the mesh of distribution of lengths 35~140 is chosen by pulp classifier, mass concentration 0.05~0.5% is configured to
P-aramid fiber fibrid slurry；
(4) by mica sheet slurry, p-aramid fiber chopped strand slurry and p-aramid fiber fibrid slurry according to fixed matter
The mixing of amount ratio is uniformly dispersed, and fixed mass ratio is that by mass percentage, p-aramid fiber chopped strand is 10~20%, right
Position aramid fiber fibrid is 20~40%, and mica sheet is 40~70%；And paper machine approach system is sent into, in paper machine approach system
PAMC solution is added in batcher, it is well mixed to obtain paper pulp；Wherein PAMC solution
Mass concentration is 0.05~1%, and consumption is relative raw material over dry gross mass 0.01~0.2%；
(5) carry out wet method using oblique net paper machine to manufacture paper with pulp, concentration 0.005~0.02% of surfing the Net is made after squeezing, drying
Body paper；Body paper, by 280~320 DEG C of baking oven, maintains 3~10min of insulation, produces qualified contraposition after heat pressing process
Aramid fiber mica is combined paper product, is packed after rewind slitting, wherein hot pressing technique is：Temperature is 280 DEG C~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.
Wherein, the aqueous medium used in all steps is deionized water；Raw material over dry gross mass is with step (4)
P-aramid fiber chopped strand, p-aramid fiber fibrid and mica sheet amount on the basis of 100%.
Embodiment 1 prepares para-aramid fiber mica extrusion coating paper using the inventive method
Thickness degree≤1.6mm muscovite fragment is chosen, impurity is removed by selection by winnowing and pressurized screen, will using ultrasonication
Muscovite fragment peels off into mica sheet, and its power is 800W, and the time is 10h, and is configured to the slurry of mass concentration 1%；Using
Trough-style pulp beater discongests length 12mm, and fiber number 2D p-aramid fiber chopped strand adds relative over dry gross mass 0.3% before discongesting
Polyethylene glycol oxide, the mass concentrations of polyethylene oxide solutions is 0.03%, obtains p-aramid fiber chopped strand slurry, slurry matter
It is 0.01% to measure concentration；P-aramid fiber fibrid is beaten using disc mill, beating degree is 40 ° of SR, passes through pulp classifier
The p-aramid fiber fibrid of the mesh of distribution of lengths 35~140 is chosen, the p-aramid fiber precipitating for being configured to mass concentration 0.05% is fine
Tie up slurry；According to mass fraction mica sheet 70%, p-aramid fiber chopped strand 10%, the ratio of p-aramid fiber fibrid 20%
Three kinds of slurries are sufficiently mixed to scattered, the PAMC solution that addition mass concentration is 0.1%, consumption is relatively former
Expect over dry gross mass 0.01%.Wet method is carried out using oblique net paper machine to manufacture paper with pulp, concentration 0.005% of surfing the Net；After squeezing, drying,
High temperature hot pressing processing is carried out using three-roller type hot press, temperature is 280 DEG C, line pressure is 300kN/m, roller speed is 1.0m/min,
Hot pressing number of times is 3 times；Again by 280 DEG C of baking oven, packed after maintaining insulation 3min, rewind slitting.
Embodiment 2 prepares para-aramid fiber mica extrusion coating paper using the inventive method
Thickness degree≤1.6mm muscovite fragment is chosen, impurity is removed by selection by winnowing and pressurized screen, will using ultrasonication
Muscovite fragment peels off into mica sheet, and its power is 1500W, and the time is 5h, and is configured to the slurry of mass concentration 3%；Using
Trough-style pulp beater discongests length 6mm, and fiber number 2D p-aramid fiber chopped strand adds relative over dry gross mass 0.5% before discongesting
Polyethylene glycol oxide, the mass concentrations of polyethylene oxide solutions is 0.05%, obtains p-aramid fiber chopped strand slurry, slurry matter
It is 0.03% to measure concentration；P-aramid fiber fibrid is beaten using disc mill, beating degree is 50 ° of SR, passes through pulp classifier
The p-aramid fiber fibrid of the mesh of distribution of lengths 35~140 is chosen, the p-aramid fiber fibrid of mass concentration 0.2% is configured to
Slurry；According to mass fraction mica sheet 65%, p-aramid fiber chopped strand 15%, the ratio of p-aramid fiber fibrid 30% will
Three kinds of slurries are sufficiently mixed scattered, the PAMC solution that addition mass concentration is 0.05%, and consumption is relatively former
Expect over dry gross mass 0.1%.Wet method is carried out using oblique net paper machine to manufacture paper with pulp, concentration 0.01% of surfing the Net；After squeezing, drying, adopt
High temperature hot pressing processing is carried out with three-roller type hot press, temperature is 320 DEG C, line pressure is 180kN/m, roller speed is 3.0m/min, heat
It is 2 times to press number of times；Again by 300 DEG C of baking oven, packed after maintaining insulation 6min, rewind slitting.
Embodiment 3 prepares para-aramid fiber mica extrusion coating paper using the inventive method
Thickness degree≤1.6mm muscovite fragment is chosen, impurity is removed by selection by winnowing and pressurized screen, will using ultrasonication
Muscovite fragment peels off into mica sheet, and its power is 3000W, and the time is 1h, and is configured to the slurry of mass concentration 6%；Using
Trough-style pulp beater discongests length 4mm, and fiber number 2D p-aramid fiber chopped strand adds relative over dry gross mass 1.0% before discongesting
Polyethylene glycol oxide, the mass concentrations of polyethylene oxide solutions is 0.10%, obtains p-aramid fiber chopped strand slurry, slurry matter
It is 0.05% to measure concentration；P-aramid fiber fibrid is beaten using disc mill, beating degree is 65 ° of SR, passes through pulp classifier
The p-aramid fiber fibrid of the mesh of distribution of lengths 35~140 is chosen, the p-aramid fiber fibrid of mass concentration 0.5% is configured to
Slurry；According to mass fraction mica sheet 40%, p-aramid fiber chopped strand 20%, the ratio of p-aramid fiber fibrid 40% will
Three kinds of slurries are sufficiently mixed scattered, the PAMC solution that addition mass concentration is 0.1%, and consumption is relative raw material
Over dry gross mass 0.2%.Wet method is carried out using oblique net paper machine to manufacture paper with pulp, concentration 0.02% of surfing the Net；After squeezing, drying, use
Three-roller type hot press carries out high temperature hot pressing processing, and temperature is 380 DEG C, and line pressure is 100kN/m, and roller speed is 4.0m/min, hot pressing
Number of times is 1 time；Again by 320 DEG C of baking oven, packed after maintaining insulation 10min, rewind slitting.
Comparative example 1
Using step and condition same as Example 2, the only distribution of lengths of p-aramid fiber fibrid is different, test knot
It is really as shown in table 1 below.
Influence of the p-aramid fiber fibrid distribution of lengths of table 1 to mica extrusion coating paper performance
From upper table 1, the distribution of lengths of p-aramid fiber fibrid is that 35~140 mesh are that paper properties are optimal.
Comparative example 2
Preparing aramid fiber mica extrusion coating paper using meta-aramid fibers, (identical with the condition of embodiment 2, only p-aramid fiber is fine
Dimension is substituted for meta-aramid fibers).
Thickness degree≤1.6mm muscovite fragment is chosen, impurity is removed by selection by winnowing and pressurized screen, will using ultrasonication
Muscovite fragment peels off into mica sheet, and its power is 1500W, and the time is 5h, and is configured to the slurry of mass concentration 3%；Using
Trough-style pulp beater discongests length 6mm, and fiber number 2D meta-aramid chopped strand adds relative over dry gross mass 0.5% before discongesting
Polyethylene glycol oxide, the mass concentrations of polyethylene oxide solutions is 0.05%, obtains meta-aramid chopped strand slurry, slurry matter
It is 0.03% to measure concentration；Meta-aramid fibre fibrid is beaten using disc mill, beating degree is 50 ° of SR, passes through pulp classifier
The meta-aramid fibre fibrid of the mesh of distribution of lengths 35~140 is chosen, the meta-aramid fibre fibrid of mass concentration 0.2% is configured to
Slurry；According to mass fraction mica sheet 65%, meta-aramid chopped strand 15%, the ratio of meta-aramid fibre fibrid 30% will
Three kinds of slurries are sufficiently mixed scattered, the PAMC solution that addition mass concentration is 0.05%, and consumption is relatively former
Expect over dry gross mass 0.1%.Wet method is carried out using oblique net paper machine to manufacture paper with pulp, concentration 0.01% of surfing the Net；After squeezing, drying, adopt
High temperature hot pressing processing is carried out with three-roller type hot press, temperature is 320 DEG C, line pressure is 180kN/m, roller speed is 3.0m/min, heat
It is 2 times to press number of times；Again by 300 DEG C of baking oven, packed after maintaining insulation 6min, rewind slitting.
Comparative example 3
It is (identical with the condition of embodiment 2, but with calcining chemical pulping using calcining chemical pulping substitution ultrasonic wave slurrying
Replace ultrasonic wave slurrying)
Thickness degree≤1.6mm muscovite fragment is chosen, impurity is removed by selection by winnowing and pressurized screen, at hydrabeating method
Muscovite fragment is peeled off into mica sheet by reason, and is configured to the slurry of mass concentration 3%；Length is discongested using trough-style pulp beater
6mm, fiber number 2D p-aramid fiber chopped strand, add the polyethylene glycol oxide of relative over dry gross mass 0.5%, polyoxygenated before discongesting
The mass concentration of vinyl solution is 0.05%, obtains p-aramid fiber chopped strand slurry, and stock quality concentration is 0.03%；Using
Disc mill is beaten to p-aramid fiber fibrid, and beating degree is 50 ° of SR, and distribution of lengths 35~140 is chosen by pulp classifier
Purpose p-aramid fiber fibrid, is configured to the p-aramid fiber fibrid slurry of mass concentration 0.2%；According to mass fraction cloud
Three kinds of slurries are sufficiently mixed point by master slice 65%, p-aramid fiber chopped strand 15%, the ratio of p-aramid fiber fibrid 30%
Dissipate, add the PAMC solution that mass concentration is 0.05%, consumption is relative raw material over dry gross mass 0.1%.
Wet method is carried out using oblique net paper machine to manufacture paper with pulp, concentration 0.01% of surfing the Net；After squeezing, drying, carried out using three-roller type hot press
High temperature hot pressing processing, 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；Pass through again
300 DEG C of baking oven, is packed after maintaining insulation 6min, rewind slitting.
Comparative example 4
Lasting insulation (identical with the condition of embodiment 2, but paper passes through baking oven after hot pressing the step of) is not used
Thickness degree≤1.6mm muscovite fragment is chosen, impurity is removed by selection by winnowing and pressurized screen, will using ultrasonication
Muscovite fragment peels off into mica sheet, and its power is 1500W, and the time is 5h, and is configured to the slurry of mass concentration 3%；Using
Trough-style pulp beater discongests length 6mm, and fiber number 2D p-aramid fiber chopped strand adds relative over dry gross mass 0.5% before discongesting
Polyethylene glycol oxide, the mass concentrations of polyethylene oxide solutions is 0.05%, obtains p-aramid fiber chopped strand slurry, slurry matter
It is 0.03% to measure concentration；P-aramid fiber fibrid is beaten using disc mill, beating degree is 50 ° of SR, passes through pulp classifier
The p-aramid fiber fibrid of the mesh of distribution of lengths 35~140 is chosen, the p-aramid fiber fibrid of mass concentration 0.2% is configured to
Slurry；According to mass fraction mica sheet 65%, p-aramid fiber chopped strand 15%, the ratio of p-aramid fiber fibrid 30% will
Three kinds of slurries are sufficiently mixed scattered, the PAMC solution that addition mass concentration is 0.05%, and consumption is relatively former
Expect over dry gross mass 0.1%.Wet method is carried out using oblique net paper machine to manufacture paper with pulp, concentration 0.01% of surfing the Net；After squeezing, drying, adopt
High temperature hot pressing processing is carried out with three-roller type hot press, temperature is 320 DEG C, line pressure is 180kN/m, roller speed is 3.0m/min, heat
It is 2 times to press number of times, is packed after rewind slitting.
The performance indications of the embodiment 1~3 of table 2 and the aramid fiber mica paper of comparative example 2~4
Data can be seen that from table 2：The para-aramid fiber mica extrusion coating paper prepared using the inventive method compared to
Using into paper, mechanical strength and dielectric properties are obtained to be improved to a certain extent, heat-resisting obtained by meta-aramid fibers in comparative example 2
Performance is improved significantly；Compared to comparative example 3, its mechanical strength and dielectric strength are higher, illustrate that p-aramid fiber precipitating is fine
The screening process effect of dimension is obvious；Relative to comparative example 4, the overall performance after insulation into paper is improved, and illustrates to hold after hot pressing
Temp effect of continuing insurance is obvious.
Embodiment 4
Thickness degree≤1.6mm muscovite fragment is chosen, impurity is removed by selection by winnowing and pressurized screen, will using ultrasonication
Muscovite fragment peels off into mica sheet, and its power is 2000W, and the time is 6h, and is configured to the slurry of mass concentration 4%；Using
Trough-style pulp beater discongests length 8mm, and fiber number 2D p-aramid fiber chopped strand adds relative over dry gross mass 0.6% before discongesting
Polyethylene glycol oxide, the mass concentrations of polyethylene oxide solutions is 0.06%, obtains p-aramid fiber chopped strand slurry, slurry matter
It is 0.04% to measure concentration；P-aramid fiber fibrid is beaten using disc mill, beating degree is 55 ° of SR, passes through pulp classifier
The p-aramid fiber fibrid of the mesh of distribution of lengths 35~140 is chosen, the p-aramid fiber fibrid of mass concentration 0.3% is configured to
Slurry；According to mass fraction mica sheet 57%, p-aramid fiber chopped strand 18%, the ratio of p-aramid fiber fibrid 25% will
Three kinds of slurries be sufficiently mixed it is scattered, add mass concentration be 1% PAMC solution, consumption be relative raw material it is exhausted
Dry gross mass 0.15%.Wet method is carried out using oblique net paper machine to manufacture paper with pulp, concentration 0.015% of surfing the Net；After squeezing, drying, use
Three-roller type hot press carries out high temperature hot pressing processing, and temperature is 340 DEG C, and line pressure is 200kN/m, and roller speed is 2.0m/min, hot pressing
Number of times is 2 times；Again by 280 DEG C of baking oven, packed after maintaining insulation 3min, rewind slitting.
Embodiment 5
Thickness degree≤1.6mm muscovite fragment is chosen, impurity is removed by selection by winnowing and pressurized screen, will using ultrasonication
Muscovite fragment peels off into mica sheet, and its power is 2500W, and the time is 4h, and is configured to the slurry of mass concentration 2%；Using
Trough-style pulp beater discongests length 10mm, and fiber number 2D p-aramid fiber chopped strand adds relative over dry gross mass 0.8% before discongesting
Polyethylene glycol oxide, the mass concentrations of polyethylene oxide solutions is 0.08%, obtains p-aramid fiber chopped strand slurry, slurry matter
It is 0.02% to measure concentration；P-aramid fiber fibrid is beaten using disc mill, beating degree is 45 ° of SR, passes through pulp classifier
The p-aramid fiber fibrid of the mesh of distribution of lengths 35~140 is chosen, the p-aramid fiber fibrid of mass concentration 0.4% is configured to
Slurry；According to mass fraction mica sheet 52%, p-aramid fiber chopped strand 12%, the ratio of p-aramid fiber fibrid 36% will
Three kinds of slurries are sufficiently mixed scattered, the PAMC solution that addition mass concentration is 0.5%, and consumption is relative raw material
Over dry gross mass 0.05%.Wet method is carried out using oblique net paper machine to manufacture paper with pulp, concentration 0.008% of surfing the Net；After squeezing, drying, adopt
High temperature hot pressing processing is carried out with three-roller type hot press, temperature is 300 DEG C, line pressure is 260kN/m, roller speed is 3.0m/min, heat
It is 3 times to press number of times；Again by 280 DEG C of baking oven, packed after maintaining insulation 3min, rewind slitting.
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
The long fiber content of fibrid is larger, can cause that paper surface is coarse and overall structure is loose, and then causes into the machinery of paper
Intensity and dielectric properties reduction；Its fines content is larger, can cause drainage difficulty of manufacturing paper with pulp, and paper-forming evenness is relatively low.Mica sheet
It is a kind of solid material, tiny can effectively fill paper hole, improve paper-forming evenness and dielectric strength, but can reduce stretching
Intensity；Larger piece is conducive to tensile strength, but can cause dielectric strength skewness, and can damage hot press roll surface.This hair
For mica flake peeling effect substantially, the power excessive time is oversize to cause mica sheet for bright middle discovery high-power ultrasonics processing
Excessively comminuted, the power too small time is too short to influence peeling effect, and power is 800~3000W, under the conditions of the time is 1~10h
The peeling effect of mica flake and best in quality.
Find to maintain insulation to there is considerable influence to the performance of mica extrusion coating paper after hot pressing in the present invention.P-aramid fiber precipitating
Amorphous state crystalline texture is presented in fiber, and during high temperature high pressure process, its crystal formation gradually changes, and is carried into paper crystallinity
Height, and then be conducive to the increase of mechanical strength.Similar to the heat treatment process of aramid fiber, mica extrusion coating paper is led to after hot-pressing
Cross baking oven and maintain insulation so that the crystal transfer of fibrid tends to be perfect, so as to reach the enhanced purpose of paper performance.Insulation
Time is unsuitable oversize, otherwise can aggravate the degraded of aramid fiber strand, damages paper properties.Maintained at a temperature of 280~320 DEG C
3~10min is incubated, the combination property into paper is optimal.
In summary, the present invention uses p-aramid fiber chopped strand, p-aramid fiber fibrid and mica sheet for raw material, leads to
Cross ultrasonic wave and peel off that mica, wet method are manufactured paper with pulp, the technique such as hot-forming prepares the new para-aramid fiber mica extrusion coating paper of high-quality,
The quantitative low, porosity for producing obtained para-aramid fiber mica extrusion coating paper is small, tensile strength, tearing strength and dielectric
Intensity is higher, and heat resistance is with the obvious advantage, is conducive to providing high-quality new insulation material for electro-mechanical arts.
Claims (7)
1. para-aramid fiber mica extrusion coating paper, it is characterised in that：By mass percentage, including p-aramid fiber chopped strand 10
~20%, p-aramid fiber fibrid 20~40% and mica sheet 40~70%；The distribution of lengths of p-aramid fiber fibrid is
35~140 mesh.
2. para-aramid fiber mica extrusion coating paper according to claim 1, it is characterised in that：P-aramid fiber chopped strand
Length is 4~12mm, fiber number 2D.
3. para-aramid fiber mica extrusion coating paper according to claim 1, it is characterised in that：Mica sheet be white clouds master slice or
Sericite piece, and Hou Du≤1.6mm.
4. the production method of para-aramid fiber mica extrusion coating paper, it is characterised in that：Comprise the following steps：
(1) preparation of mica sheet slurry：Take mica flake to carry out impurity elimination processing, then peeled off mica flake using ultrasonication
Into mica sheet, and the mica sheet slurry for being configured to that mass concentration is 1~6% that adds water；
(2) p-aramid fiber chopped strand is scattered：P-aramid fiber chopped strand is dispersed in water, relative raw material over dry is added total
After the polyethylene oxide solutions of quality 0.3~1.0%, fully discongest and be uniformly dispersed, it is 0.01~0.05% to obtain mass concentration
P-aramid fiber chopped strand slurry；
(3) mashing of p-aramid fiber fibrid：P-aramid fiber fibrid is beaten, it is 0.05 to be configured to mass concentration
~0.5% p-aramid fiber fibrid slurry；
(4) mica sheet slurry, p-aramid fiber chopped strand slurry and p-aramid fiber fibrid slurry are mixed and are uniformly dispersed, its
In by mass percentage, p-aramid fiber chopped strand be 10~20%, p-aramid fiber fibrid be 20~40%, mica sheet
For 40~70%；Be then fed into paper machine approach system, in the header box of paper machine approach system add mass concentration be 0.05~
1% PAMC solution, the consumption of PAMC solution is relative raw material over dry gross mass 0.01
~0.2%, it is well mixed to obtain paper pulp；
(5) paper pulp carries out wet method using oblique net paper machine and manufactured paper with pulp shaping, and online concentration is 0.005~0.02%, it is dry after through heat
Pressure obtains para-aramid fiber mica extrusion coating paper；
Wherein, it is original to amount to 100% with the p-aramid fiber chopped strand in step (4), p-aramid fiber fibrid and mica sheet
Expect over dry gross mass benchmark；
Hot pressing is carried out using three-roller type hot press in step (5), and hot pressing technique is：Temperature be 280 DEG C~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；And para-aramid fiber after hot pressing
Mica extrusion coating paper maintains 3~10min of insulation by 280~320 DEG C of baking oven.
5. the production method of para-aramid fiber mica extrusion coating paper according to claim 4, it is characterised in that：Step (1)
The ultrasonication condition of middle mica flake is：Power is 800~3000W, and the time is 1~10h.
6. the production method of para-aramid fiber mica extrusion coating paper according to claim 4, it is characterised in that：Step (2)
The mass concentration of middle polyethylene oxide solutions is 0.03~0.10%.
7. the production method of para-aramid fiber mica extrusion coating paper according to claim 4, it is characterised in that：Step (3)
The beating degree of middle p-aramid fiber fibrid is 40~65 ° of SR.
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