CN106120474A - A kind of polyester/para-position/meta-aramid is combined the preparation method of electric insulation paper - Google Patents
A kind of polyester/para-position/meta-aramid is combined the preparation method of electric insulation paper Download PDFInfo
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- CN106120474A CN106120474A CN201610600990.1A CN201610600990A CN106120474A CN 106120474 A CN106120474 A CN 106120474A CN 201610600990 A CN201610600990 A CN 201610600990A CN 106120474 A CN106120474 A CN 106120474A
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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
-
- 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
-
- 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
Abstract
The invention discloses a kind of polyester/para-position/meta-aramid and be combined the preparation method of electric insulation paper, specifically include following steps: PET chopped strand is carried out pretreatment, standby；PPTA chopped strand is carried out pretreatment；PET chopped strand after pretreatment and PPTA chopped strand after pretreatment are blended in fluffer and carry out discongesting for the first time；Then add PMIA pulp fibers, carry out secondary and discongest；Finally add dispersant, carry out third time and discongest, obtain suspension；The suspension obtained is injected in sheet forming apparatus and carries out dehydration forming, after squeezing, dried, obtain aramid fiber extrusion coating paper body paper；The aramid fiber extrusion coating paper body paper of gained is carried out hot-forming, obtains aramid fiber extrusion coating paper.The aramid fiber extrusion coating paper preparation method that the present invention proposes, can maximally utilise the high powerful feature of chopped strand, the softening temperature that polyester fiber is relatively low, improves strength character and the dielectric properties of meta-position aramid fiber paper.
Description
Technical field
The invention belongs to paper industry and material industry interleaving techniques field, relate to a kind of polyester/para-position/meta-aramid multiple
Close the preparation method of electric insulation paper.
Background technology
With meta-aramid (poly(isophthaloyl metaphenylene diamine)) pulp fibers and meta-aramid chopped strand as raw material, utilize
Modern paper wet papermaking technology is manufactured paper with pulp and hot-forming prepared flaky composite material, is a kind of high-performance synthetic fibers paper substrate
Material.Because it has tough mechanical performance, good dielectric properties, preferable resistance to elevated temperatures and can design flexibly
Property, can be extensive at special dimensions such as Aero-Space, traffic power, national defense and military as insulant, electronic material, structural material
Application.
The production domesticization of meta-aramid paper base material is also faced with a heavy difficult problem, has the problem of raw materials quality, fiber to disperse and wet
Method net-forming process and the problem of equipment, particularly hot press forming technology problem.The meta-position aramid fiber paper mechanical strength properties formed is poor,
And parchmentizing phenomenon is serious, paper insulating properties are poor.Become restriction aramid paper and further apply structural material and insulation
The bottleneck of Material Field.
Terylene (polyethylene terephthalate), English abbreviation PET, PET is a kind of thermoplastic fibre, thermostability phase
To preferably, start generation cohering softening point temperature when 205 DEG C is 238～240 DEG C, and fusing point is 255～260 DEG C, initial decomposition
Temperature more than 350 DEG C.PET also has excellent dielectric properties, elasticity, a dimensional stability, rub resistance, and resistance to daylight is the most mould
Do not eat into.PET mixes, with the synthetic fibers of electrical insulation capability and resistance to elevated temperatures, high performance insulating paper of manufacturing paper with pulp.
P-aramid fiber (PPTA), English abbreviation PPTA, it is right to exist in para-aramid fiber main chain
Penylene base makes main chain rigidity relatively big, and rotating in strand can be higher, and macromolecule presents planar rigidity extended chain conformation.P-aramid fiber
Fiber is prepared by fiber spinning from crystalline state method, has prominent hot strength, stretch modulus, thermostability, dielectric properties.With meta-aramid
Fiber is compared, and para-aramid fiber intensity is its 3～7 times, has the good reputation of " synthetic steel wire ".Heat resistance is good, vitrification
Transition temperature is 345 DEG C, and decomposition temperature is 560 DEG C.Limited oxygen index is 28～30.
Meta-aramid (poly(isophthaloyl metaphenylene diamine)), English abbreviation PMIA, meta-aramid pulp is by aramid fiber polymer
Solution thread, in precipitating agent or solidification liquid, is stirred vigorously at a high speed by precipitating equipment and is frozen into pulp state in small, broken bits, and it is heavy to prepare
Analysis fiber, is also pulp.There is hydrophilic group in meta-aramid pulp macromolecular chain, has good dispersibility in water, with height
Performance chopped strand mixes prepares high-temperature resistance insulation paper.
Summary of the invention
It is an object of the invention to provide a kind of polyester/para-position/meta-aramid and be combined the preparation method of electric insulation paper, permissible
Maximally utilise the high powerful feature of chopped strand, the softening temperature that polyester fiber is relatively low, improve meta-position aramid fiber paper
Strength character and dielectric properties.
The technical solution adopted in the present invention is, a kind of polyester/para-position/meta-aramid is combined the preparation side of electric insulation paper
Method, specifically includes following steps:
Step 1, carries out pretreatment to PET chopped strand, standby；
Step 2, carries out pretreatment to PPTA chopped strand；
Step 3, will mix with through step 2 pretreated PPTA chopped strand through step 1 pretreated PET chopped strand
It is combined in fluffer and carries out discongesting for the first time；Then add PMIA pulp fibers, carry out secondary and discongest；Finally add dispersion
Agent, carries out third time and discongests, obtain suspension；
Step 4, suspension step 3 obtained injects in sheet forming apparatus and carries out dehydration forming, through squeezing, dried
After aramid fiber extrusion coating paper body paper；
Step 5, carries out hot-forming by the aramid fiber extrusion coating paper body paper of step 4 gained, obtains aramid fiber extrusion coating paper.
The feature of the present invention also resides in,
Wherein the preprocessing process of step 1 is:
It is 1.0 × 10 by PET chopped strand in molar concentration-3Mol/L～3 × 10-3Mol/L, temperature are 40 DEG C～60 DEG C
Dodecylbenzene sodium sulfonate solution in soak 0.5h～1h, then washing 3～5 times, finally do at 100 DEG C～105 DEG C of vacuum
Dry case is dried to over dry.
Wherein the preprocessing process of step 2 is:
It is 1.0 × 10 by PPTA chopped strand in molar concentration-3Mol/L～3 × 10-3Mol/L, temperature are 40 DEG C～60
DEG C dodecylbenzene sodium sulfonate solution in soak 0.5h～1h, then washing 3～5 times, finally in 100 DEG C～105 DEG C of vacuum
Drying baker is dried to over dry.
Wherein in step 3, the mass ratio of PET chopped strand and PPTA chopped strand is 1:3,2:2 or 3:1, and PMIA pulp is fine
Dimension quality accounts for the 60% of Substance.
Wherein the dispersant in step 3 is polyethylene glycol oxide, and addition is relative to PET chopped strand, PPTA chopped fibre
Dimension and the 0.05%～0.07% of PMIA pulp fibers absolute dry mass, the parameter of discongesting discongested for the first time is: fluffer is discongested
15000r～25000r；The parameter of discongesting that second time is discongested is: 15000r～25000r discongested by fluffer；What third time was discongested dredges
Solution parameter is: 15000r～25000r discongested by fluffer.
Wherein the detailed process of step 4 is: injected in sheet forming apparatus by the suspension of step 3 gained, prepares quantitatively
For 100g/m2Aramid paper humidity strip, then processes 1min～3min through hydraulic press squeezing, removes moisture unnecessary in wet sheet,
After by squeezing process after wet sheet dry in paper baker.
Wherein in step 4, the pressure of hydraulic press is 0.4MPa～0.6MPa.
Wherein in step 4, the drying temperature in paper baker is 95 DEG C～105 DEG C, drying time be 5min～
8min。
Wherein the detailed process of step 5 is:
First aramid fiber extrusion coating paper body paper step 4 prepared preheats 30s～50s on vulcanizing press, then flat
Hot pressing 2～4 times on plate vulcanizer, be placed on three roller hot presses hot pressing 1～3 times the most again.
Wherein in step 5, the hot compression parameters on vulcanizing press is: hot pressing temperature is 260 DEG C～280 DEG C, hot pressing time
For 3min～5min, hot pressing pressure is 12MPa～18MPa；
Wherein in step 5, the hot compression parameters on three roller hot presses is: hot pressing temperature is 220 DEG C～240 DEG C, hot pressing pressure
100bar～140bar, roller speed 0.5～1.5m/min.
The invention has the beneficial effects as follows, the preparation method that the present invention provides uses fiber PPTA fiber, PET and PMIA
Pulp fibers, as raw material, controls hot pressing temperature, makes temperature be less than the fusing point of fiber and be higher than the softening temperature of PET,
PET and PMIA pulp fibers major part are occurred melted, and certain pressure condition makes paper density improve, point
Subchain arrangement is the most regular in order, and the result of pulp fibers deformation and migration is so that Inter-fiber voids diminishes and tails off, fiber
Between bonded area bigger, fiber combines tightr, makes into paper tensile index and increases substantially and compressive resistance the most significantly carries
Height, the advantage of PPTA fiber reinforcement meta-position aramid fiber paper is to maximally utilise the high powerful feature of chopped strand, improves
The strength character of meta-position aramid fiber paper.PET softening temperature is relatively low, and paper porosity declines, and compressive resistance increases substantially.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is described in detail.
A kind of polyester/para-position/meta-aramid of the present invention is combined the preparation method of electric insulation paper, specifically includes following step
Rapid:
Step 1, carries out pretreatment to PET chopped strand, standby；
The preprocessing process of PET chopped strand is: be 1.0 × 10 by PET chopped strand in molar concentration-3Mol/L～3 ×
10-3Mol/L, temperature are to soak 0.5h～1h, then washing 3～5 times in the dodecylbenzene sodium sulfonate solution of 40 DEG C～60 DEG C,
Finally in 100 DEG C～105 DEG C of vacuum drying ovens, it is dried to over dry.
Step 2, carries out pretreatment to PPTA chopped strand；
The preprocessing process of PPTA chopped strand is: be 1.0 × 10 by PPTA chopped strand in molar concentration-3Mol/L～3
×10-3Mol/L, temperature are to soak 0.5h～1h, then washing 3～5 in the dodecylbenzene sodium sulfonate solution of 40 DEG C～60 DEG C
Secondary, finally in 100 DEG C～105 DEG C of vacuum drying ovens, it is dried to over dry.
Step 3, will mix with through step 2 pretreated PPTA chopped strand through step 1 pretreated PET chopped strand
It is combined in fluffer and carries out discongesting for the first time；Then add PMIA pulp fibers, carry out secondary and discongest；Finally add dispersion
Agent, carries out third time and discongests, obtain suspension；
In step 3, PET chopped strand accounts for the 40% of Substance with the quality sum of PPTA chopped strand, and PMIA pulp is fine
Dimension quality accounts for the 60% of Substance, and PET chopped strand is 1:3,2:2 or 3:1 with the mass ratio of PPTA chopped strand；
Dispersant in step 3 is polyethylene glycol oxide, addition be relative to PET chopped strand, PPTA chopped strand with
The 0.05%～0.07% of PMIA pulp fibers absolute dry mass, the parameter of discongesting discongested for the first time is: 15000r discongested by fluffer
～25000r, discongest concentration and control in mass percent 0.3%；The parameter of discongesting that second time is discongested is: fluffer is discongested
15000r～25000r, discongests concentration and controls in mass percent 0.3%；The parameter of discongesting that third time is discongested is: fluffer is dredged
Solve 15000r～25000r, discongest concentration and control in mass percent 0.3%.
Step 4, suspension step 3 obtained injects in sheet forming apparatus and carries out dehydration forming, through squeezing, dried
After aramid fiber extrusion coating paper body paper；
The detailed process of step 4 is: is injected in sheet forming apparatus by the suspension of step 3 gained, prepares quantification of
100g/m2(i.e. Substance is 100g/m to aramid paper humidity strip2), then process 1min～3min through hydraulic press squeezing, remove l Water Paper
Moisture unnecessary in sheet, the wet sheet after finally squeezing being processed 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, carries out hot-forming by the aramid fiber extrusion coating paper body paper of step 4 gained, obtains aramid fiber extrusion coating paper；The tool of step 5
Body process is:
First aramid fiber extrusion coating paper body paper step 4 prepared preheats 30s～50s on vulcanizing press, then flat
Hot pressing 2～4 times on plate vulcanizer, be placed on three roller hot presses hot pressing 1～3 times the most again.
Hot compression parameters on vulcanizing press is: hot pressing temperature is 260 DEG C～280 DEG C, hot pressing time be 3min～
5min, hot pressing pressure is 12MPa～18MPa.
Hot compression parameters on three roller hot presses is: hot pressing temperature is 220 DEG C～240 DEG C, hot pressing pressure 100bar～
140bar, roller speed 0.5～1.5m/min.
Embodiment 1
PET chopped strand is carried out pretreatment, and preprocessing process is: by PET chopped strand molar concentration be 1.0 ×
10-3Mol/L, temperature are to soak 0.5h, then washing 3 times in the dodecylbenzene sodium sulfonate solution of 40 DEG C, finally true at 100 DEG C
Empty drying baker is dried to over dry, standby；PPTA chopped strand is carried out pretreatment, and preprocessing process is: by PPTA chopped strand
It is 1.0 × 10 in molar concentration-3Mol/L, temperature are to soak 0.5h in the dodecylbenzene sodium sulfonate solution of 40 DEG C, then wash
3 times, finally in 100 DEG C of vacuum drying ovens, it is dried to over dry；Weigh 1.27g pretreated over dry PET chopped strand and PPTA
Chopped strand, discongests 15000r in fluffer, discongest concentration control mass percent 0.3% (over dry PET chopped strand and
The gross mass of PPTA chopped strand is 1.27g), wherein over dry PET chopped strand is 1:3 with the mass ratio of PPTA chopped strand,
Then weigh 1.90g over dry meta-aramid (PMIA) pulp to discongest, discongest 15000r, discongest concentration and control at percent mass
Ratio 0.3%, is eventually adding relative to PET chopped strand, PPTA chopped strand and PMIA pulp fibers absolute dry mass
(dispersant) polyethylene glycol oxide of 0.05% is discongested, and discongests 15000r, discongests concentration and controls in mass percent 0.3%,
Obtaining suspension, the suspension that will obtain injects in sheet forming apparatus, prepares quantification of 100g/m2Aramid paper humidity strip, then warp
Hydraulic press squeezing under the pressure of 0.4MPa processes 1min, removes moisture unnecessary in wet sheet, after finally squeezing being processed
Wet sheet is dried in paper baker, and drying temperature is 95 DEG C, and drying time is 5min, obtains aramid fiber extrusion coating paper body paper；
The aramid fiber extrusion coating paper body paper obtained first is preheated on vulcanizing press 30s, then hot pressing 2 times, hot pressing on vulcanizing press
Temperature is 260 DEG C, and hot pressing time is 3min, and hot pressing pressure is 12MPa；Finally it is placed on hot pressing 1 time, hot pressing on three roller hot presses again
Temperature is 220 DEG C, and hot pressing pressure is 100bar, and roller speed is 0.5m/min, obtains aramid fiber extrusion coating paper.
Embodiment 2
PET chopped strand is carried out pretreatment, and preprocessing process is: by PET chopped strand molar concentration be 3.0 ×
10-3Mol/L, temperature are to soak 1h, then washing 5 times in the dodecylbenzene sodium sulfonate solution of 60 DEG C, finally in 105 DEG C of vacuum
Drying baker is dried to over dry, standby；PPTA chopped strand is carried out pretreatment, and preprocessing process is: existed by PPTA chopped strand
Molar concentration is 3.0 × 10-3Mol/L, temperature are to soak 1h, then washing 5 times in the dodecylbenzene sodium sulfonate solution of 60 DEG C,
Finally in 105 DEG C of vacuum drying ovens, it is dried to over dry；Weigh 1.27g pretreated over dry PET chopped strand and PPTA chopped
Fiber, discongests 25000r in fluffer, discongests concentration and controls at mass percent 0.3% (over dry PET chopped strand and PPTA
The gross mass of chopped strand is 1.27g), wherein over dry PET chopped strand is 3:1 with the mass ratio of PPTA chopped strand, then
Weigh 1.90g over dry meta-aramid (PMIA) pulp to discongest, discongest 25000r, discongest concentration and control in mass percent
0.3%, it is eventually adding relative to PET chopped strand, PPTA chopped strand and the 0.07% of PMIA pulp fibers absolute dry mass
(dispersant) polyethylene glycol oxide discongest, discongest 25000r, discongest concentration and control, in mass percent 0.3%, to obtain suspension
Liquid, injects the suspension obtained in sheet forming apparatus, prepares quantification of 100g/m2Aramid paper humidity strip, then through hydraulic press
Under the pressure of 0.6MPa, squeezing processes 3min, removes moisture unnecessary in wet sheet, the wet sheet after finally squeezing being processed
Drying in paper baker, drying temperature is 105 DEG C, and drying time is 8min, obtains aramid fiber extrusion coating paper body paper；To obtain
Aramid fiber extrusion coating paper body paper on vulcanizing press, first preheat 50s, then hot pressing 4 times on vulcanizing press, hot pressing temperature is
280 DEG C, hot pressing time is 5min, and hot pressing pressure is 18MPa；Finally being placed on hot pressing 3 times on three roller hot presses again, hot pressing temperature is
240 DEG C, hot pressing pressure is 140bar, and roller speed is 1.5m/min, obtains aramid fiber extrusion coating paper.
Embodiment 3
PET chopped strand is carried out pretreatment, and preprocessing process is: by PET chopped strand molar concentration be 2.0 ×
10-3Mol/L, temperature are to soak 0.75h, then washing 4 times in the dodecylbenzene sodium sulfonate solution of 50 DEG C, finally at 102 DEG C
Vacuum drying oven is dried to over dry, standby；PPTA chopped strand is carried out pretreatment, and preprocessing process is: PPTA chopped is fine
Dimension is 2.0 × 10 in molar concentration-3Mol/L, temperature are to soak 0.75h in the dodecylbenzene sodium sulfonate solution of 50 DEG C, then
Wash 4 times, finally in 102 DEG C of vacuum drying ovens, be dried to over dry；Weigh 1.27g pretreated over dry PET chopped strand and
PPTA chopped strand, discongests 20000r in fluffer, discongests concentration and controls at mass percent 0.3% (over dry PET chopped fibre
The gross mass of peacekeeping PPTA chopped strand is 1.27g), wherein over dry PET chopped strand with the mass ratio of PPTA chopped strand is
3:1, then weighs 1.90g over dry meta-aramid (PMIA) pulp and discongests, discongest 20000r, discongest concentration and control in quality
Percentage ratio 0.3%, is eventually adding relative to PET chopped strand, PPTA chopped strand and PMIA pulp fibers absolute dry mass
(dispersant) polyethylene glycol oxide of 0.06% is discongested, and discongests 20000r, discongests concentration and controls in mass percent 0.3%,
Obtaining suspension, the suspension that will obtain injects in sheet forming apparatus, prepares quantification of 100g/m2Aramid paper humidity strip, then warp
Hydraulic press squeezing under the pressure of 0.5MPa processes 2min, removes moisture unnecessary in wet sheet, after finally squeezing being processed
Wet sheet is dried in paper baker, and drying temperature is 100 DEG C, and drying time is 6.5min, obtains aramid fiber extrusion coating paper former
Paper；The aramid fiber extrusion coating paper body paper obtained first is preheated on vulcanizing press 40s, then hot pressing 3 times on vulcanizing press, heat
Pressure temperature is 270 DEG C, and hot pressing time is 4min, and hot pressing pressure is 15MPa；Finally it is placed on hot pressing 2 times on three roller hot presses again, heat
Pressure temperature is 230 DEG C, and hot pressing pressure is 120bar, and roller speed is 1m/min, obtains aramid fiber extrusion coating paper, the anti-tensile of gained aramid fiber extrusion coating paper
Index is 164.2N m g-1, compressive resistance is 14.4kV mm-1。
Embodiment 4
PET chopped strand is carried out pretreatment, and preprocessing process is: by PET chopped strand molar concentration be 2.0 ×
10-3Mol/L, temperature are to soak 0.75h, then washing 4 times in the dodecylbenzene sodium sulfonate solution of 50 DEG C, finally at 102 DEG C
Vacuum drying oven is dried to over dry, standby；PPTA chopped strand is carried out pretreatment, and preprocessing process is: PPTA chopped is fine
Dimension is 2.0 × 10 in molar concentration-3Mol/L, temperature are to soak 0.75h in the dodecylbenzene sodium sulfonate solution of 50 DEG C, then
Wash 4 times, finally in 102 DEG C of vacuum drying ovens, be dried to over dry；Weigh 1.27g pretreated over dry PET chopped strand and
PPTA chopped strand, discongests 20000r in fluffer, discongests concentration and controls at mass percent 0.3% (over dry PET chopped fibre
The gross mass of peacekeeping PPTA chopped strand is 1.27g), wherein over dry PET chopped strand with the mass ratio of PPTA chopped strand is
2:2, then weighs 1.90g over dry meta-aramid (PMIA) pulp and discongests, discongest 20000r, discongest concentration and control in quality
Percentage ratio 0.3%, is eventually adding relative to PET chopped strand, PPTA chopped strand and PMIA pulp fibers absolute dry mass
(dispersant) polyethylene glycol oxide of 0.06% is discongested, and discongests 20000r, discongests concentration and controls in mass percent 0.3%,
Obtaining suspension, the suspension that will obtain injects in sheet forming apparatus, prepares quantification of 100g/m2Aramid paper humidity strip, then warp
Hydraulic press squeezing under the pressure of 0.5MPa processes 2min, removes moisture unnecessary in wet sheet, after finally squeezing being processed
Wet sheet is dried in paper baker, and drying temperature is 100 DEG C, and drying time is 6.5min, obtains aramid fiber extrusion coating paper former
Paper；The aramid fiber extrusion coating paper body paper obtained first is preheated on vulcanizing press 40s, then hot pressing 3 times on vulcanizing press, heat
Pressure temperature is 270 DEG C, and hot pressing time is 4min, and hot pressing pressure is 15MPa；Finally it is placed on hot pressing 2 times on three roller hot presses again, heat
Pressure temperature is 230 DEG C, and hot pressing pressure is 120bar, and roller speed is 1m/min, obtains aramid fiber extrusion coating paper, the anti-tensile of gained aramid fiber extrusion coating paper
Index is 143.8N m g-1, compressive resistance is 21.2kV mm-1。
Embodiment 5
PET chopped strand is carried out pretreatment, and preprocessing process is: by PET chopped strand molar concentration be 2.0 ×
10-3Mol/L, temperature are to soak 0.75h, then washing 4 times in the dodecylbenzene sodium sulfonate solution of 50 DEG C, finally at 102 DEG C
Vacuum drying oven is dried to over dry, standby；PPTA chopped strand is carried out pretreatment, and preprocessing process is: PPTA chopped is fine
Dimension is 2.0 × 10 in molar concentration-3Mol/L, temperature are to soak 0.75h in the dodecylbenzene sodium sulfonate solution of 50 DEG C, then
Wash 4 times, finally in 102 DEG C of vacuum drying ovens, be dried to over dry；Weigh 1.27g pretreated over dry PET chopped strand and
PPTA chopped strand, discongests 20000r in fluffer, discongests concentration and controls at mass percent 0.3% (over dry PET chopped fibre
The gross mass of peacekeeping PPTA chopped strand is 1.27g), wherein over dry PET chopped strand with the mass ratio of PPTA chopped strand is
1:3, then weighs 1.90g over dry meta-aramid (PMIA) pulp and discongests, discongest 20000r, discongest concentration and control in quality
Percentage ratio 0.3%, is eventually adding relative to PET chopped strand, PPTA chopped strand and PMIA pulp fibers absolute dry mass
(dispersant) polyethylene glycol oxide of 0.06% is discongested, and discongests 20000r, discongests concentration and controls in mass percent 0.3%,
Obtaining suspension, the suspension that will obtain injects in sheet forming apparatus, prepares quantification of 100g/m2Aramid paper humidity strip, then warp
Hydraulic press squeezing under the pressure of 0.5MPa processes 2min, removes moisture unnecessary in wet sheet, after finally squeezing being processed
Wet sheet is dried in paper baker, and drying temperature is 100 DEG C, and drying time is 6.5min, obtains aramid fiber extrusion coating paper former
Paper；The aramid fiber extrusion coating paper body paper obtained first is preheated on vulcanizing press 40s, then hot pressing 3 times on vulcanizing press, heat
Pressure temperature is 270 DEG C, and hot pressing time is 4min, and hot pressing pressure is 15MPa；Finally it is placed on hot pressing 2 times on three roller hot presses again, heat
Pressure temperature is 230 DEG C, and hot pressing pressure is 120bar, and roller speed is 1m/min, obtains aramid fiber extrusion coating paper, the anti-tensile of gained aramid fiber extrusion coating paper
Index is 96.5N m g-1, compressive resistance is 32.3kV mm-1。
In the preparation method of above-described embodiment 3～5, resisting of the aramid fiber composite paper that different PET/PPTA fibre furnish obtain
Tensile index is as shown in table 1 below,
Table 1
The electric property of the aramid fiber extrusion coating paper that different PET/PPTA fibre furnish obtain is as shown in table 2 below,
Table 2
The aramid fiber extrusion coating paper that the preparation method using above-described embodiment 3 and embodiment 5 is prepared and Nomex 410 paper
Physical property contrasts, and result is as shown in table 3 below,
Table 3
Note: self-control aramid paper 1 is the aramid fiber extrusion coating paper using the preparation method of above-described embodiment 5 to obtain；Self-control aramid paper 2
For the aramid fiber extrusion coating paper using the preparation method of above-described embodiment 3 to obtain.
By above-described embodiment 3～5 it can be seen that use vulcanizing press to carry out hot pressing, when hot pressing temperature 270 DEG C, preheating
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 230 DEG C, hot pressing
Pressure is 120bar, and roller speed is 1m/min, and when PET chopped strand and PPTA chopped strand proportioning are 1:3, aramid fiber extrusion coating paper resists
Tensile index is close with Nomex T410 paper tensile index, and compressive resistance is better than Nomex T410 paper.As PET chopped strand and PPTA
When chopped strand proportioning is 3:1, aramid fiber extrusion coating paper tensile index is more than Nomex T410 paper tensile index.Use vulcanizing press
Hot press period, aramid fiber extrusion coating paper is at temperature with pressure dual effect, and hot pressing actual temperature is higher than the actual temperature that arranges, and pulp is fine
Dimension melting degree is higher, and viscosity flow strengthens, and is closely wrapped in chopped strand surface, and between fiber, effective bonded area becomes big, short
Cut that fiber and pulp are intermolecular interpenetrates fusion, chopped strand strengthen mutually and pulp matrix mutually between the boundary bonding that formed
Performance significantly promotes.Using three roller hot press hot press period, aramid fiber extrusion coating paper enters one through hot calendered effect, surface strength of paper
Step promotes, and paper surface is more smooth, and evenness promotes, and improves paper strength performance further.Use vulcanizing press hot pressing
Process the hot pressing mode combined with three roller hot press hot-pressing processing, prepare PET/PPTA/PMIA aramid fiber extrusion coating paper intensive properties
Can be higher than Nomex T410 paper, compressive resistance is better than Nomex T410 paper.
A kind of polyester/para-position/meta-aramid that the present invention uses is combined the preparation method of electric insulation paper, and aramid paper is in warm
During pressure, preheating link is a most important link, and aramid paper body paper is that chopped strand is random with meta pulp fibers
, in paper, there is the most small hole in arrangement and the inierpeneirating network structure that constitutes, aramid paper body paper during depositing, due to
Capillarity and aramid fiber have certain hydrophilic, therefore there is certain moisture in paper, and paper is the most preheated directly
Tapping into row hot-forming, owing to moisture evaporates and cannot effectively distribute, paper surface produces more bubble, thus has a strong impact on paper
Apparent state and strength character, carry out hot-forming again after paper is preheated, the distributing of water effective in paper, paper exists
Before hot-forming, keep being dried.Eliminate the moisture impact on paper strength performance in paper, thus obtain preferable sheet
State.
Claims (10)
1. polyester/para-position/meta-aramid is combined the preparation method of electric insulation paper, it is characterised in that: specifically include following
Step:
Step 1, carries out pretreatment to PET chopped strand, standby；
Step 2, carries out pretreatment to PPTA chopped strand；
Step 3, will be blended in through step 2 pretreated PPTA chopped strand through step 1 pretreated PET chopped strand
Fluffer is carried out discongest for the first time；Then add PMIA pulp fibers, carry out secondary and discongest；Finally add dispersant,
Carry out third time to discongest, obtain suspension；
Step 4, suspension step 3 obtained injects in sheet forming apparatus and carries out dehydration forming, after squeezing, dried
Aramid fiber extrusion coating paper body paper；
Step 5, carries out hot-forming by the aramid fiber extrusion coating paper body paper of step 4 gained, obtains aramid fiber extrusion coating paper.
A kind of polyester/para-position/meta-aramid the most according to claim 1 is combined the preparation method of electric insulation paper, and it is special
Levy and be: the preprocessing process of described step 1 is:
It is 1.0 × 10 by PET chopped strand in molar concentration-3Mol/L～3 × 10-3Mol/L, temperature are 40 DEG C～the ten of 60 DEG C
Dialkyl benzene sulfonic acids sodium solution soaks 0.5h～1h, then washing 3～5 times, finally at 100 DEG C～105 DEG C of vacuum drying ovens
In be dried to over dry.
A kind of polyester/para-position/meta-aramid the most according to claim 1 is combined the preparation method of electric insulation paper, and it is special
Levy and be: the preprocessing process of described step 2 is:
It is 1.0 × 10 by PPTA chopped strand in molar concentration-3Mol/L～3 × 10-3Mol/L, temperature are 40 DEG C～the ten of 60 DEG C
Dialkyl benzene sulfonic acids sodium solution soaks 0.5h～1h, then washing 3～5 times, finally at 100 DEG C～105 DEG C of vacuum drying ovens
In be dried to over dry.
A kind of polyester/para-position/meta-aramid the most according to claim 1 is combined the preparation method of electric insulation paper, and it is special
Levying and be: in described step 3, PET chopped strand is 1:3,2:2 or 3:1 with the mass ratio of PPTA chopped strand, PMIA pulp is fine
Dimension quality accounts for the 60% of Substance.
A kind of polyester/para-position/meta-aramid the most according to claim 1 is combined the preparation method of electric insulation paper, and it is special
Levying and be: the dispersant in described step 3 is polyethylene glycol oxide, addition is relative to PET chopped strand, PPTA chopped strand
With the 0.05%～0.07% of PMIA pulp fibers absolute dry mass, the parameter of discongesting discongested for the first time is: fluffer is discongested
15000r～25000r；The parameter of discongesting that second time is discongested is: 15000r～25000r discongested by fluffer；What third time was discongested dredges
Solution parameter is: 15000r～25000r discongested by fluffer.
A kind of polyester/para-position/meta-aramid the most according to claim 1 is combined the preparation method of electric insulation paper, and it is special
Levy and be: the detailed process of described step 4 is:
The suspension of step 3 gained is injected in sheet forming apparatus, prepares quantification of 100g/m2Aramid paper humidity strip, then through oil
Press squeezing processes 1min～3min, removes moisture unnecessary in wet sheet, and the wet sheet after finally squeezing being processed is at paper
Baker is dried.
A kind of polyester/para-position/meta-aramid the most according to claim 6 is combined the preparation method of electric insulation paper, and it is special
Levy and be: in described step 4, the pressure of hydraulic press is 0.4MPa～0.6MPa.
A kind of polyester/para-position/meta-aramid the most according to claim 6 is combined the preparation method of electric insulation paper, and it is special
Levy and be: in described step 4, the drying temperature in paper baker is 95 DEG C～105 DEG C, and drying time is 5min～8min.
A kind of polyester/para-position/meta-aramid the most according to claim 1 is combined the preparation method of electric insulation paper, and it is special
Levy and be: the detailed process of step 5 is:
First aramid fiber extrusion coating paper body paper step 4 prepared preheats 30s～50s, then at flat board sulfur on vulcanizing press
Hot pressing 2～4 times on change machine, be placed on three roller hot presses hot pressing 1～3 times the most again.
A kind of polyester/para-position/meta-aramid the most according to claim 9 is combined the preparation method of electric insulation paper, and it is special
Levy and be: in described step 5, the hot compression parameters on vulcanizing press is: hot pressing temperature is 260 DEG C～280 DEG C, hot pressing time
For 3min～5min, hot pressing pressure is 12MPa～18MPa；
In described step 5, the hot compression parameters on three roller hot presses is: hot pressing temperature is 220 DEG C～240 DEG C, hot pressing pressure
100bar～140bar, roller speed 0.5～1.5m/min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN109457533A (en) * | 2018-10-10 | 2019-03-12 | 华南理工大学 | A kind of preparation method regenerating aramid fiber extrusion coating paper |
| CN114108362A (en) * | 2020-09-01 | 2022-03-01 | 深圳光启尖端技术有限责任公司 | Manufacturing method of high-temperature-resistant aramid fiber composite paper wave-absorbing honeycomb |
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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 |
| CN109457533A (en) * | 2018-10-10 | 2019-03-12 | 华南理工大学 | A kind of preparation method regenerating aramid fiber extrusion coating paper |
| CN114108362A (en) * | 2020-09-01 | 2022-03-01 | 深圳光启尖端技术有限责任公司 | Manufacturing method of high-temperature-resistant aramid fiber composite paper wave-absorbing honeycomb |
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