CN106223129B - A kind of preparation method aligning meta-aramid electric insulation paper - Google Patents
A kind of preparation method aligning meta-aramid electric insulation paper Download PDFInfo
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- CN106223129B CN106223129B CN201610601986.7A CN201610601986A CN106223129B CN 106223129 B CN106223129 B CN 106223129B CN 201610601986 A CN201610601986 A CN 201610601986A CN 106223129 B CN106223129 B CN 106223129B
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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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
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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
Abstract
The invention discloses a kind of preparation methods for aligning meta-aramid electric insulation paper, specifically includes the following steps: p-aramid fiber chopped strand is pre-processed, it is spare；Meta-aramid chopped strand is pre-processed；Contraposition chopped strand after pretreatment is blended in fluffer with meta-aramid chopped strand after pretreatment and discongest for the first time；Then meta-aramid pulp fibers are added, secondary discongest is carried out；Dispersing agent is finally added, third time is carried out and discongests, obtain suspension；Obtained suspension is injected in sheet forming apparatus and carries out dehydration forming, aramid fiber electric insulation paper body paper is obtained after being squeezed, being dried；The progress of resulting aramid fiber electric insulation paper body paper is hot-forming, obtain aramid fiber electric insulation paper.The preparation method of aramid fiber electric insulation paper proposed by the present invention is matched using different p-aramid fiber chopped strands and meta-aramid chopped strand, prepares high intensity, the good aramid fiber electric insulation paper of dielectric properties.
Description
Technical field
The invention belongs to paper industries and material industry interleaving techniques field, are related to a kind of contraposition meta-aramid electric insulation
The preparation method of paper.
Background technique
Using meta-aramid (poly) pulp fibers and meta-aramid chopped strand as raw material, utilize
Modern paper wet papermaking technology is manufactured paper with pulp and hot-forming flaky composite material obtained, is a kind of high-performance synthetic fibers paper base
Material.Because it with tough mechanical performance, good dielectric properties, ideal high temperature resistance and can flexibly be designed
Property, it is extensive in special dimensions such as aerospace, traffic power, defense military to can be used as insulating materials, electronic material, structural material
Using.
The production domesticization of meta-aramid paper base material is also faced with heavy problem, have the problem of material quality, fiber dispersion and it is wet
The problem of method net-forming process and equipment, especially hot press forming technology problem.The meta-position aramid fiber paper mechanical strength properties of formation are poor,
And parchmentizing phenomenon is serious, paper dielectric properties are bad, insulation performance is poor, become restriction aramid paper and further apply structure
Material and the bottleneck in insulating materials field.
P-aramid fiber (poly(p-phenylene terephthalamide)), English abbreviation PPTA exist in para-aramid fiber main chain pair
Penylene base keeps main chain rigidly larger, and rotational energy is higher in strand, and planar rigidity extended chain conformation is presented in macromolecule.P-aramid fiber
Fiber is prepared by fiber spinning from crystalline state method, has tensile strength outstanding, stretch modulus, heat resistance, dielectric properties.With meta-aramid
Fiber is compared, and para-aramid fiber intensity is its 3~7 times, the good reputation with " synthetic steel wire ".Heat resistance is good, vitrifying
Transition temperature is 345 DEG C, and decomposition temperature is 560 DEG C.Limit oxygen index is 28~30.
Meta-aramid (poly), English abbreviation PMIA, meta-aramid pulp is by aramid fiber condensate
Solution thread is vigorously stirred by precipitating equipment high speed in precipitating agent or solidification liquid and is frozen into pulp state fine crushing, be made heavy
Fiber is analysed, pulp is also.There are hydrophilic radicals for meta-aramid pulp macromolecular chain, have good dispersibility in water, with height
Performance chopped strand, which mixes, prepares high-temperature resistance insulation paper.
Summary of the invention
The object of the present invention is to provide a kind of preparation methods for aligning meta-aramid electric insulation paper, using different contraposition virtues
Synthetic fibre chopped strand and meta-aramid chopped strand match, and prepare high intensity, the good aramid fiber electric insulation paper of dielectric properties.
The technical scheme adopted by the invention is that a kind of preparation method for aligning meta-aramid electric insulation paper, specific to wrap
Include following steps:
Step 1, p-aramid fiber chopped strand is pre-processed, it is spare；
Step 2, meta-aramid chopped strand is pre-processed；
Step 3, it will be chopped through the pretreated contraposition chopped strand of step 1 with through the pretreated meta-aramid of step 2
Fiber, which is blended in, to carry out discongesting for the first time in fluffer；Then meta-aramid pulp fibers are added, secondary discongest is carried out；Finally
Dispersing agent is added, third time is carried out and discongests, obtain suspension；
Step 4, the suspension that step 3 obtains is injected in sheet forming apparatus and carries out dehydration forming, squeezed, be dried
Aramid fiber electric insulation paper body paper is obtained afterwards；
Step 5, the resulting aramid fiber electric insulation paper body paper progress of step 4 is hot-forming, obtain aramid fiber electric insulation paper.
The features of the present invention also characterized in that
The wherein preprocessing process of step 1 are as follows:
By p-aramid fiber chopped strand molar concentration be 1.0 × 10-3Mol/L~3 × 10-3Mol/L, temperature are 40 DEG C
0.5h~1h is impregnated in~60 DEG C of neopelex solution, is then washed 3~5 times, finally at 100 DEG C~105 DEG C
Over dry is dried in vacuum oven.
The wherein preprocessing process of step 2 are as follows:
By meta-aramid chopped strand molar concentration be 1.0 × 10-3Mol/L~3 × 10-3Mol/L, temperature are 40 DEG C
0.5h~1h is impregnated in~60 DEG C of neopelex solution, is then washed 3~5 times, finally at 100 DEG C~105 DEG C
Over dry is dried in vacuum oven.
Wherein the mass ratio of p-aramid fiber chopped strand and meta-aramid chopped strand is 1:3,2:2 or 3:1 in step 3,
The meta-aramid pulp fibers quality being added when being discongested for the second time accounts for the 60% of Substance.
Wherein the dispersing agent in step 3 is polyethylene glycol oxide, and additive amount is relative to p-aramid fiber chopped strand, meta position virtue
The 0.05%~0.07% of synthetic fibre chopped strand and meta-aramid pulp fibers absolute dry mass, that discongests for the first time discongests parameter are as follows:
Fluffer discongests 15000r~25000r；That discongests for the second time discongests parameter are as follows: fluffer discongests 15000r~25000r；Third
It is secondary discongest discongest parameter are as follows: fluffer discongests 15000r~25000r.
The wherein detailed process of step 4 are as follows: by the resulting suspension injection sheet forming apparatus of step 3, prepare quantitative
For 100g/m2Then aramid paper humidity strip squeezes processing 1min~3min through hydraulic press, removes moisture extra in wet sheet, most
Afterwards will squeezing treated that wet sheet is dried in paper baker.
Wherein the pressure of hydraulic press is 0.4MPa~0.6MPa in step 4.
Wherein the drying temperature in step 4 in paper baker be 95 DEG C~105 DEG C, drying time be 5min~
8min。
The wherein detailed process of step 5 are as follows:
The aramid fiber electric insulation paper body paper that step 4 is prepared is preheated into 30s~50s on vulcanizing press first, then
Hot pressing 2~4 times on vulcanizing press are finally placed on three roller hot presses hot pressing 1~3 time again.
The wherein hot compression parameters in step 5 on vulcanizing press are as follows: hot pressing temperature is 270 DEG C~290 DEG C, hot pressing time
For 3min~5min, hot pressing pressure is 12MPa~18MPa；
The wherein hot compression parameters in step 5 on three roller hot presses are as follows: hot pressing temperature is 230 DEG C~250 DEG C, hot pressing pressure
100bar~140bar, 0.5~1.5m/min of roller speed.
The invention has the advantages that preparation method provided by the invention uses p-aramid fiber chopped strand, meta-aramid
Chopped strand and meta-aramid pulp fibers are as raw material.The composition of assorted fibre can use two kinds of forms, i.e. dissimilarity
The mixing for fiber of energy or mixing for the different geometrical size fiber of same performance.Assorted fibre may be generated different from single
The confounding effect of fiber, to play enhancing and the toughening effect of component fibre.Hot pressing temperature is controlled, makes temperature lower than the fibre that is chopped
The fusing point of dimension, so that meta-aramid pulp fibers largely melt, and certain pressure condition mentions paper density
Height, strand arrangement is more regular orderly, pulp fibers deformation and migration the result is that Inter-fiber voids is made to become smaller and tail off,
Bonded area is bigger between fiber, fiber combine it is closer, make into paper tensile index increase substantially and compressive resistance also substantially
The advantages of degree improves, para-aramid fiber enhancing meta-position aramid fiber paper is that the high-strength spy of chopped strand can be maximally utilised
Property, improve the strength character of meta-position aramid fiber paper.When p-aramid fiber is mutually compounded with meta-aramid chopped strand, generates and be different from list
The performance of one component, this can be the heat partition effect of fiber, increases substantially at paper compressive resistance.
Specific embodiment
The present invention is described in detail With reference to embodiment.
A kind of preparation method for aligning meta-aramid electric insulation paper of the present invention, specifically includes the following steps:
Step 1, p-aramid fiber chopped strand is pre-processed, it is spare；
The preprocessing process of p-aramid fiber chopped strand are as follows: by p-aramid fiber chopped strand molar concentration be 1.0 × 10- 3Mol/L~3 × 10-30.5h~1h is impregnated in mol/L, the neopelex solution that temperature is 40 DEG C~60 DEG C, then
Washing 3~5 times, is finally dried to over dry in 100 DEG C~105 DEG C vacuum ovens.
Step 2, meta-aramid chopped strand is pre-processed；
The preprocessing process of meta-aramid chopped strand are as follows: by meta-aramid chopped strand molar concentration be 1.0 × 10- 3Mol/L~3 × 10-30.5h~1h is impregnated in mol/L, the neopelex solution that temperature is 40 DEG C~60 DEG C, then
Washing 3~5 times, is finally dried to over dry in 100 DEG C~105 DEG C vacuum ovens.
It step 3, will be through the pretreated p-aramid fiber chopped strand of step 1 and through the pretreated meta-aramid of step 2
Chopped strand, which is blended in, to carry out discongesting for the first time in fluffer；Then meta-aramid pulp fibers are added, secondary discongest is carried out；
Dispersing agent is finally added, third time is carried out and discongests, obtain suspension；
The quality sum of p-aramid fiber chopped strand and (when discongesting for the first time) meta-aramid chopped strand accounts for paper in step 3
The 40% of Zhang Dingliang, (when discongesting for the second time) meta-aramid pulp fibers quality account for the 60% of Substance, and p-aramid fiber is chopped
The mass ratio of fiber and meta-aramid chopped strand is 1:3,2:2 or 3:1；
Dispersing agent in step 3 is polyethylene glycol oxide, and additive amount is relative between contraposition chopped strand, (discongesting for the first time)
The 0.05%~0.07% of position aramid short fiber and (discongesting for the second time) meta-aramid pulp fibers absolute dry mass is dredged for the first time
Solution discongests parameter are as follows: fluffer discongests 15000r~25000r, discongests concentration control in mass percent 0.3%；Second
That discongests discongests parameter are as follows: fluffer discongests 15000r~25000r, discongests concentration control in mass percent 0.3%；Third
It is secondary discongest discongest parameter are as follows: fluffer discongests 15000r~25000r, discongest concentration control in mass percent 0.3%.
Step 4, the suspension that step 3 obtains is injected in sheet forming apparatus and carries out dehydration forming, squeezed, be dried
Aramid fiber electric insulation paper body paper is obtained afterwards；
The detailed process of step 4 are as follows: by the resulting suspension injection sheet forming apparatus of step 3, prepare quantification of
100g/m2(i.e. Substance is 100g/m to aramid paper humidity strip2), processing 1min~3min then is squeezed through hydraulic press, removes l Water Paper
Extra moisture in piece, finally will squeezing treated that wet sheet is dried in paper baker.
Wherein the pressure of hydraulic press is 0.4MPa~0.6MPa, and the drying temperature in paper baker is 95 DEG C~105 DEG C,
Drying time is 5min~8min；
Step 5, the resulting aramid fiber electric insulation paper body paper progress of step 4 is hot-forming, obtain aramid fiber electric insulation paper；Step
Rapid 5 detailed process are as follows:
The aramid fiber electric insulation paper body paper that step 4 is prepared is preheated into 30s~50s on vulcanizing press first, then
Hot pressing 2~4 times on vulcanizing press are finally placed on three roller hot presses hot pressing 1~3 time again.
Hot compression parameters on vulcanizing press are as follows: hot pressing temperature be 270 DEG C~290 DEG C, hot pressing time be 3min~
5min, hot pressing pressure are 12MPa~18MPa.
Hot compression parameters on three roller hot presses are as follows: hot pressing temperature is 230 DEG C~250 DEG C, hot pressing pressure 100bar~
140bar, 0.5~1.5m/min of roller speed.
Embodiment 1
P-aramid fiber chopped strand is pre-processed, preprocessing process are as follows: by p-aramid fiber chopped strand mole dense
Degree is 1.0 × 10-30.5h is impregnated in mol/L, the neopelex solution that temperature is 40 DEG C, then washing 3 times, finally
It is dried to over dry in 100 DEG C of vacuum ovens, it is spare；Meta-aramid chopped strand is pre-processed, preprocessing process are as follows: will
Meta-aramid chopped strand is 1.0 × 10 in molar concentration-3In mol/L, the neopelex solution that temperature is 40 DEG C
0.5h is impregnated, then washes 3 times, is finally dried to over dry in 100 DEG C of vacuum ovens；Weigh the pretreated over dry of 1.27g
P-aramid fiber chopped strand and meta-aramid chopped strand, discongest 15000r in fluffer, discongest concentration control in quality hundred
Divide than 0.3% (gross mass of over dry p-aramid fiber chopped strand and meta-aramid chopped strand is 1.27g), wherein over dry aligns
The mass ratio of aramid short fiber and meta-aramid chopped strand is 1:3, then weighs 1.90g over dry meta-aramid pulp fibers
Discongested, discongest 15000r, discongest concentration control in mass percent 0.3%, be eventually adding relative to contraposition chopped strand,
(discongesting for the first time) meta-aramid chopped strand (divides with (discongesting for the second time) meta-aramid pulp fibers absolute dry mass 0.05%
Powder) polyethylene glycol oxide discongested, and 15000r is discongested, and is discongested concentration control in mass percent 0.3%, is obtained suspension, and it will
In obtained suspension injection sheet forming apparatus, quantification of 100g/m is prepared2Aramid paper humidity strip, then exists through hydraulic press
Squeezing processing 1min, removes extra moisture in wet sheet under the pressure of 0.4MPa, finally will squeezing treated that wet sheet exists
It is dried in paper baker, drying temperature is 95 DEG C, drying time 5min, obtains aramid fiber electric insulation paper body paper；Will
To aramid fiber electric insulation paper body paper 30s is first preheated on vulcanizing press, then hot pressing 2 times, hot pressing on vulcanizing press
Temperature is 270 DEG C, hot pressing time 3min, hot pressing pressure 12MPa；It is finally placed on three roller hot presses again hot pressing 1 time, hot pressing
Temperature is 230 DEG C, hot pressing pressure 100bar, and roller speed is 0.5m/min, obtains aramid fiber electric insulation paper.
Embodiment 2
P-aramid fiber chopped strand is pre-processed, preprocessing process are as follows: by p-aramid fiber chopped strand mole dense
Degree is 3.0 × 10-31h is impregnated in mol/L, the neopelex solution that temperature is 60 DEG C, then washes 5 times, finally exists
It is dried to over dry in 105 DEG C of vacuum ovens, it is spare；Meta-aramid chopped strand is pre-processed, preprocessing process are as follows: by between
Position aramid short fiber is 3.0 × 10 in molar concentration-3It is soaked in mol/L, the neopelex solution that temperature is 60 DEG C
1h is steeped, then washes 5 times, is finally dried to over dry in 105 DEG C of vacuum ovens；Weigh the pretreated over dry contraposition of 1.27g
Aramid short fiber and meta-aramid chopped strand, discongest 25000r in fluffer, discongest concentration control in mass percent
0.3% (gross mass of over dry p-aramid fiber chopped strand and meta-aramid chopped strand be 1.27g), wherein over dry p-aramid fiber
The mass ratio of chopped strand and meta-aramid chopped strand is 3:1, then weighs the progress of 1.90g over dry meta-aramid pulp fibers
It discongests, discongests 25000r, discongest concentration control in mass percent 0.3%, be eventually adding relative to contraposition chopped strand, (the
Once discongest) (the dispersion of meta-aramid chopped strand and (discongesting for the second time) meta-aramid pulp fibers absolute dry mass 0.07%
Agent) polyethylene glycol oxide discongested, and 25000r is discongested, and concentration control is discongested in mass percent 0.3%, obtains suspension, will
To suspension injection sheet forming apparatus in, prepare quantification of 100g/m2Aramid paper humidity strip, then through hydraulic press in 0.6MPa
Pressure under squeezing processing 3min, remove extra moisture in wet sheet, finally will squeezing treated that wet sheet is dried in paper
It is dried in dry device, drying temperature is 105 DEG C, drying time 8min, obtains aramid fiber electric insulation paper body paper；The virtue that will be obtained
Synthetic fibre electric insulation paper body paper first preheats 50s on vulcanizing press, and then hot pressing 4 times, hot pressing temperature are on vulcanizing press
290 DEG C, hot pressing time 5min, hot pressing pressure 18MPa；It is finally placed on three roller hot presses again hot pressing 3 times, hot pressing temperature is
240 DEG C, hot pressing pressure 140bar, roller speed is 1.5m/min, obtains aramid fiber electric insulation paper.
Embodiment 3
P-aramid fiber chopped strand is pre-processed, preprocessing process are as follows: by p-aramid fiber chopped strand mole dense
Degree is 2.0 × 10-30.75h is impregnated in mol/L, the neopelex solution that temperature is 50 DEG C, then washing 4 times, most
It is dried to over dry in 102 DEG C of vacuum ovens afterwards, it is spare；Meta-aramid chopped strand is pre-processed, preprocessing process are as follows:
By meta-aramid chopped strand molar concentration be 2.0 × 10-3Mol/L, the neopelex solution that temperature is 50 DEG C
Then middle immersion 0.75h washes 4 times, is finally dried to over dry in 102 DEG C of vacuum ovens；It is pretreated absolutely to weigh 1.27g
Dry p-aramid fiber chopped strand and meta-aramid chopped strand, discongest 20000r in fluffer, discongest concentration control in quality
(gross mass of over dry p-aramid fiber chopped strand and meta-aramid chopped strand is 1.27g) to percentage 0.3%, wherein over dry pair
The mass ratio of position aramid short fiber and meta-aramid chopped strand is 3:1, and it is fine then to weigh 1.90g over dry meta-aramid pulp
Dimension is discongested, and 20000r is discongested, and discongests concentration control in mass percent 0.3%, is eventually adding relative to the chopped fibre of contraposition
Dimension, (discongesting for the first time) meta-aramid chopped strand and (discongesting for the second time) meta-aramid pulp fibers absolute dry mass 0.06%
(dispersing agent) polyethylene glycol oxide is discongested, and 20000r is discongested, and is discongested concentration control in mass percent 0.3%, is obtained suspension,
Obtained suspension is injected in sheet forming apparatus, quantification of 100g/m is prepared2Aramid paper humidity strip, then exists through hydraulic press
Squeezing processing 2min, removes extra moisture in wet sheet under the pressure of 0.5MPa, finally will squeezing treated that wet sheet exists
It is dried in paper baker, drying temperature is 100 DEG C, drying time 6.5min, obtains aramid fiber electric insulation paper body paper；It will
Obtained aramid fiber electric insulation paper body paper first preheats 40s on vulcanizing press, then hot pressing 3 times on vulcanizing press, heat
Pressing temperature is 280 DEG C, hot pressing time 4min, hot pressing pressure 15MPa；It is finally placed on three roller hot presses again hot pressing 2 times, heat
Pressing temperature is 240 DEG C, hot pressing pressure 120bar, and roller speed is 1m/min, obtains aramid fiber electric insulation paper, gained aramid fiber electric insulation
The tensile index of paper is 152.8Nmg-1, compressive resistance 16.8kVmm-1。
Embodiment 4
P-aramid fiber chopped strand is pre-processed, preprocessing process are as follows: by p-aramid fiber chopped strand mole dense
Degree is 2.0 × 10-30.75h is impregnated in mol/L, the neopelex solution that temperature is 50 DEG C, then washing 4 times, most
It is dried to over dry in 102 DEG C of vacuum ovens afterwards, it is spare；Meta-aramid chopped strand is pre-processed, preprocessing process are as follows:
By meta-aramid chopped strand molar concentration be 2.0 × 10-3Mol/L, the neopelex solution that temperature is 50 DEG C
Then middle immersion 0.75h washes 4 times, is finally dried to over dry in 102 DEG C of vacuum ovens；It is pretreated absolutely to weigh 1.27g
Dry p-aramid fiber chopped strand and meta-aramid chopped strand, discongest 20000r in fluffer, discongest concentration control in quality
(gross mass of over dry p-aramid fiber chopped strand and meta-aramid chopped strand is 1.27g) to percentage 0.3%, wherein over dry pair
The mass ratio of position aramid short fiber and meta-aramid chopped strand is 2:2, and it is fine then to weigh 1.90g over dry meta-aramid pulp
Dimension is discongested, and 20000r is discongested, and discongests concentration control in mass percent 0.3%, is eventually adding relative to the chopped fibre of contraposition
Dimension, (discongesting for the first time) meta-aramid chopped strand and (discongesting for the second time) meta-aramid pulp fibers absolute dry mass 0.06%
(dispersing agent) polyethylene glycol oxide is discongested, and 20000r is discongested, and is discongested concentration control in mass percent 0.3%, is obtained suspension,
Obtained suspension is injected in sheet forming apparatus, quantification of 100g/m is prepared2Aramid paper humidity strip, then exists through hydraulic press
Squeezing processing 2min, removes extra moisture in wet sheet under the pressure of 0.5MPa, finally will squeezing treated that wet sheet exists
It is dried in paper baker, drying temperature is 100 DEG C, drying time 6.5min, obtains aramid fiber electric insulation paper body paper；It will
Obtained aramid fiber electric insulation paper body paper first preheats 40s on vulcanizing press, then hot pressing 3 times on vulcanizing press, heat
Pressing temperature is 280 DEG C, hot pressing time 4min, hot pressing pressure 15MPa；It is finally placed on three roller hot presses again hot pressing 2 times, heat
Pressing temperature is 240 DEG C, hot pressing pressure 120bar, and roller speed is 1m/min, obtains aramid fiber electric insulation paper, gained aramid fiber electric insulation
The tensile index of paper is 130.4Nmg-1, compressive resistance 26.0kVmm-1。
Embodiment 5
P-aramid fiber chopped strand is pre-processed, preprocessing process are as follows: by p-aramid fiber chopped strand mole dense
Degree is 2.0 × 10-30.75h is impregnated in mol/L, the neopelex solution that temperature is 50 DEG C, then washing 4 times, most
It is dried to over dry in 102 DEG C of vacuum ovens afterwards, it is spare；Meta-aramid chopped strand is pre-processed, preprocessing process are as follows:
By meta-aramid chopped strand molar concentration be 2.0 × 10-3Mol/L, the neopelex solution that temperature is 50 DEG C
Then middle immersion 0.75h washes 4 times, is finally dried to over dry in 102 DEG C of vacuum ovens；It is pretreated absolutely to weigh 1.27g
Dry p-aramid fiber chopped strand and meta-aramid chopped strand, discongest 20000r in fluffer, discongest concentration control in quality
(gross mass of over dry p-aramid fiber chopped strand and meta-aramid chopped strand is 1.27g) to percentage 0.3%, wherein over dry pair
The mass ratio of position aramid short fiber and meta-aramid chopped strand is 1:3, and it is fine then to weigh 1.90g over dry meta-aramid pulp
Dimension is discongested, and 20000r is discongested, and discongests concentration control in mass percent 0.3%, is eventually adding relative to the chopped fibre of contraposition
Dimension, (discongesting for the first time) meta-aramid chopped strand and (discongesting for the second time) meta-aramid pulp fibers absolute dry mass 0.06%
(dispersing agent) polyethylene glycol oxide is discongested, and 20000r is discongested, and is discongested concentration control in mass percent 0.3%, is obtained suspension,
Obtained suspension is injected in sheet forming apparatus, quantification of 100g/m is prepared2Aramid paper humidity strip, then exists through hydraulic press
Squeezing processing 2min, removes extra moisture in wet sheet under the pressure of 0.5MPa, finally will squeezing treated that wet sheet exists
It is dried in paper baker, drying temperature is 100 DEG C, drying time 6.5min, obtains aramid fiber electric insulation paper body paper；It will
Obtained aramid fiber electric insulation paper body paper first preheats 40s on vulcanizing press, then hot pressing 3 times on vulcanizing press, heat
Pressing temperature is 280 DEG C, hot pressing time 4min, hot pressing pressure 15MPa；It is finally placed on three roller hot presses again hot pressing 2 times, heat
Pressing temperature is 240 DEG C, hot pressing pressure 120bar, and roller speed is 1m/min, obtains aramid fiber electric insulation paper, gained aramid fiber electric insulation
The tensile index of paper is 109.7Nmg-1, compressive resistance 14.9kVmm-1。
In the preparation method of above-described embodiment 3~5, the aramid fiber that different contrapositions/meta position chopped strand matches is electrically exhausted
The strength character (tensile index) of edge paper as shown in table 1 below,
Table 1
The electric property (compressive resistance) for the aramid fiber electric insulation paper that different contrapositions/meta position chopped strand matches is as follows
Shown in table 2,
Table 2
By the physics of the aramid fiber electric insulation paper and 410 paper of Nomex prepared using the preparation method of above-described embodiment 4
Performance compares, as a result as shown in table 3 below,
Table 3
Note: self-control aramid paper is the aramid fiber electric insulation paper obtained using the preparation method of above-described embodiment 4.
It can be seen from above-described embodiment 3~5 using vulcanizing press carry out hot pressing, 280 DEG C of hot pressing temperature, preheating when
Between 40s, hot pressing pressure 15MPa, hot pressing time 4min, in conjunction with hot pressing 2 times on three roller hot presses, hot pressing temperature is 240 DEG C, hot pressing
Pressure is 120bar, and roller speed is 1m/min, when p-aramid fiber chopped strand is 2:2 with meta-aramid chopped strand proportion, virtue
Synthetic fibre electric insulation paper tensile index is better than Nomex T410 paper, and compressive resistance is close.Using vulcanizing press hot press period, aramid fiber
For electric insulation paper at temperature and pressure dual effect, hot pressing actual temperature is higher than actual setting temperature, and pulp fibers melt journey
Spend it is higher, viscosity flow enhancing, be tightly wrapped between chopped strand surface, fiber effective bonded area and become larger, chopped strand and
Pulp is intermolecular to interpenetrate fusion, and the phase interface adhesive property formed between chopped strand reinforced phase and pulp matrix phase is substantially
Degree is promoted.And p-aramid fiber chopped strand mixes with meta-aramid chopped strand, can produce different from one-component paper
Can, larger change occurs for paper tensile strength and compressive resistance.Using three roller hot press hot press periods, aramid fiber electric insulation paper
Through hot pressing light action, surface strength of paper is further promoted, and paper surface is more smooth, and evenness is promoted, and further improves paper
Open strength character.The hot pressing mode combined using vulcanizing press hot-pressing processing with three roller hot press hot-pressing processings, is prepared
Contraposition/meta-aramid electric insulation paper paper strength character is higher than Nomex T410 paper, and compressive resistance is close with Nomex T410 paper.
A kind of preparation method for aligning meta-aramid electric insulation paper of the present invention, aramid paper is in hot pressing, preheating ring
Section is a more important link, and aramid paper body paper is chopped strand and meta position pulp fibers random alignment and the interpenetrating constituted
There are a large amount of small holes in paper in network structure, aramid paper body paper is during storage, due to capillarity and virtue
Synthetic fibre fiber has certain hydrophily, therefore there are certain moisture in paper, paper is not preheated directly carry out it is hot-forming, by
It evaporates and can not effectively distribute in moisture, paper surface generates more bubble, to seriously affect the apparent state of paper and strong
Performance is spent, carries out again hot-forming after paper is preheated, water effective distributes in paper, and paper is protected before hot-forming
Drying is held, influence of the moisture to paper strength performance in paper is eliminated, to obtain ideal paper status.
Claims (7)
1. a kind of preparation method for aligning meta-aramid electric insulation paper, it is characterised in that: specifically includes the following steps:
Step 1, p-aramid fiber chopped strand is pre-processed, it is spare；
Step 2, meta-aramid chopped strand is pre-processed；
It step 3, will be through the pretreated contraposition chopped strand of step 1 and through the pretreated meta-aramid chopped strand of step 2
It is blended in and carries out discongesting for the first time in fluffer；Then meta-aramid pulp fibers are added, secondary discongest is carried out；Finally add again
Enter dispersing agent, carries out third time and discongest, obtain suspension；
Step 4, the suspension that step 3 obtains is injected in sheet forming apparatus and carries out dehydration forming, after being squeezed, being dried
Aramid fiber electric insulation paper body paper；
Step 5, the resulting aramid fiber electric insulation paper body paper progress of step 4 is hot-forming, obtain aramid fiber electric insulation paper；
The detailed process of step 5 are as follows:
The aramid fiber electric insulation paper body paper that step 4 is prepared is preheated into 30s~50s on vulcanizing press first, then flat
Hot pressing 2~4 times on plate vulcanizer are finally placed on three roller hot presses hot pressing 1~3 time again；
Hot compression parameters in the step 5 on vulcanizing press are as follows: hot pressing temperature is 270 DEG C~290 DEG C, and hot pressing time is
3min~5min, hot pressing pressure are 12MPa~18MPa；
Hot compression parameters in the step 5 on three roller hot presses are as follows: hot pressing temperature is 230 DEG C~250 DEG C, hot pressing pressure
100bar~140bar, 0.5~1.5m/min of roller speed；
The mass ratio of p-aramid fiber chopped strand and meta-aramid chopped strand is 1:3,2:2 or 3:1 in the step 3, is carried out
The meta-aramid pulp fibers quality being added when discongesting for the second time accounts for the 60% of Substance.
2. a kind of preparation method for aligning meta-aramid electric insulation paper according to claim 1, it is characterised in that: described
The preprocessing process of step 1 are as follows:
By p-aramid fiber chopped strand molar concentration be 1.0 × 10-3Mol/L~3 × 10-3Mol/L, temperature are 40 DEG C~60 DEG C
Neopelex solution in impregnate 0.5h~1h, then wash 3~5 times, it is finally dry in 100 DEG C~105 DEG C vacuum
Over dry is dried in dry case.
3. a kind of preparation method for aligning meta-aramid electric insulation paper according to claim 1, it is characterised in that: described
The preprocessing process of step 2 are as follows:
By meta-aramid chopped strand molar concentration be 1.0 × 10-3Mol/L~3 × 10-3Mol/L, temperature are 40 DEG C~60 DEG C
Neopelex solution in impregnate 0.5h~1h, then wash 3~5 times, it is finally dry in 100 DEG C~105 DEG C vacuum
Over dry is dried in dry case.
4. a kind of preparation method for aligning meta-aramid electric insulation paper according to claim 1, it is characterised in that: described
Dispersing agent in step 3 is polyethylene glycol oxide, additive amount be relative to p-aramid fiber chopped strand, meta-aramid chopped strand with
The 0.05%~0.07% of meta-aramid pulp fibers absolute dry mass, that discongests for the first time discongests parameter are as follows: fluffer is discongested
15000r~25000r；That discongests for the second time discongests parameter are as follows: fluffer discongests 15000r~25000r；What third time was discongested dredges
Solve parameter are as follows: fluffer discongests 15000r~25000r.
5. a kind of preparation method for aligning meta-aramid electric insulation paper according to claim 1, it is characterised in that: described
The detailed process of step 4 are as follows:
By in the resulting suspension injection sheet forming apparatus of step 3, quantification of 100g/m is prepared2Aramid paper humidity strip, then through oil
Press squeezing processing 1min~3min, removes extra moisture in wet sheet, finally will squeezing treated wet sheet in paper
It is dried in baker.
6. a kind of preparation method for aligning meta-aramid electric insulation paper according to claim 5, it is characterised in that: described
The pressure of hydraulic press is 0.4MPa~0.6MPa in step 4.
7. a kind of preparation method for aligning meta-aramid electric insulation paper according to claim 5, it is characterised in that: described
Drying temperature in step 4 in paper baker is 95 DEG C~105 DEG C, and drying time is 5min~8min.
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| CN107663807A (en) * | 2017-11-22 | 2018-02-06 | 西南大学 | A kind of method for lifting aramid insulating paper mechanical performance and hydrophobic oleophobic performance |
| CN109457533B (en) * | 2018-10-10 | 2021-04-23 | 华南理工大学 | Preparation method of regenerated aramid composite paper |
| JP7183073B2 (en) * | 2019-02-22 | 2022-12-05 | デュポン帝人アドバンスドペーパー株式会社 | Aramid paper manufacturing method |
| CN110528281B (en) * | 2019-09-16 | 2021-09-17 | 武汉纺织大学 | Preparation method of aramid pulp fiber |
| CN111485446A (en) * | 2020-04-14 | 2020-08-04 | 山东聚芳新材料股份有限公司 | Enhanced aramid paper and preparation method thereof |
| CN113981731B (en) * | 2021-11-03 | 2022-12-09 | 润华(江苏)新材料有限公司 | Mixed pulp and high-hydrophobicity paper |
| CN117230651A (en) * | 2023-09-28 | 2023-12-15 | 陕西科技大学 | Electric insulation paper material and preparation method and application thereof |
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Denomination of invention: A preparation method of para-positional meta aramid electrical insulating paper Effective date of registration: 20230220 Granted publication date: 20190226 Pledgee: Bank of China Limited by Share Ltd. Three Gorges Branch Pledgor: HUBEI CHENGDONG RENEWABLE RESOURCES TECHNOLOGY DEVELOPMENT CO.,LTD. Registration number: Y2023420000059 |