CN117230651A - Electric insulation paper material and preparation method and application thereof - Google Patents
Electric insulation paper material and preparation method and application thereof Download PDFInfo
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- CN117230651A CN117230651A CN202311278752.XA CN202311278752A CN117230651A CN 117230651 A CN117230651 A CN 117230651A CN 202311278752 A CN202311278752 A CN 202311278752A CN 117230651 A CN117230651 A CN 117230651A
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- 239000000463 material Substances 0.000 title claims abstract description 78
- 238000009413 insulation Methods 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 229920006231 aramid fiber Polymers 0.000 claims abstract description 91
- 239000000835 fiber Substances 0.000 claims abstract description 77
- 229920003235 aromatic polyamide Polymers 0.000 claims abstract description 65
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000005011 phenolic resin Substances 0.000 claims abstract description 62
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 62
- 239000003365 glass fiber Substances 0.000 claims abstract description 55
- 238000010292 electrical insulation Methods 0.000 claims abstract description 53
- 239000004760 aramid Substances 0.000 claims abstract description 45
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000007731 hot pressing Methods 0.000 claims abstract description 34
- 239000011259 mixed solution Substances 0.000 claims abstract description 34
- 238000001035 drying Methods 0.000 claims abstract description 30
- 238000002156 mixing Methods 0.000 claims abstract description 19
- 238000003825 pressing Methods 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 238000001291 vacuum drying Methods 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 16
- 238000004140 cleaning Methods 0.000 claims description 14
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 14
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 238000004513 sizing Methods 0.000 claims description 8
- 238000007654 immersion Methods 0.000 claims description 3
- 238000007598 dipping method Methods 0.000 abstract description 14
- 239000011148 porous material Substances 0.000 abstract description 8
- 238000011049 filling Methods 0.000 abstract description 2
- 239000000123 paper Substances 0.000 description 140
- 239000012774 insulation material Substances 0.000 description 9
- 238000001514 detection method Methods 0.000 description 6
- 238000001878 scanning electron micrograph Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000012772 electrical insulation material Substances 0.000 description 2
- 229920006253 high performance fiber Polymers 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000011086 glassine Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention discloses an electrical insulation paper material, a preparation method and application thereof, comprising the following steps: mixing glass fiber and aramid fiber, and sequentially performing fluffing, wet forming, cold pressing and squeezing and vacuum drying treatment to obtain aramid/glass fiber paper; wherein the aramid fiber is a mixture of chopped fiber of para-aramid and fibrid of meta-aramid; dipping aramid fiber/glass fiber paper into a phenolic resin/alcohol mixed solution, and drying after the dipping is finished to obtain dried paper; carrying out hot pressing treatment on the dried paper to obtain the electric insulation paper material; according to the invention, the fibrid of meta-aramid is filled between the chopped fiber and glass fiber of para-aramid, which is helpful for forming paper and improving electrical insulation performance; the insulation performance of the paper is improved by filling the internal pores of the paper with the impregnated phenolic resin; the interface binding force among the fibers of the insulating paper is improved through hot pressing treatment, so that the insulating performance and the mechanical strength of the paper are improved.
Description
Technical Field
The invention belongs to the technical field of electrical insulation materials, and particularly relates to an electrical insulation paper material, a preparation method and application thereof.
Background
With the light weight development of new energy automobiles and trains and the development of high density batteries, new requirements and challenges are provided for key electric insulation materials of automobiles or trains; the electric insulation material directly influences the running reliability and service life of the driving motor of the new energy automobile and the safety of various high-speed trains, light rails and high-power traction transformers.
At present, aramid fiber is used as a common electrical insulation material, but the aramid fiber is used as an aramid fiber insulation material which is often hygroscopic, and the aramid fiber insulation material prepared by utilizing the aramid fiber has loose structure, a large number of pores exist on the surface and in the aramid fiber insulation material, so that the insulation performance of the aramid fiber insulation material is seriously influenced, and the problems of low mechanical strength and poor electrical performance of the aramid fiber insulation material seriously prevent the application of the aramid fiber insulation material in new energy automobiles or trains.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides an electrical insulation paper material and a preparation method and application thereof, and solves the problems that the insulation performance of an aramid insulation material is seriously affected, and the mechanical strength is low and the electrical performance is poor due to loose structure, large number of pores exist on the surface and in the interior of the pure aramid material.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a preparation method of an electrical insulation paper material, which comprises the following steps:
mixing glass fiber and aramid fiber, and sequentially performing fluffing, wet forming, cold pressing and squeezing and vacuum drying treatment to obtain aramid/glass fiber paper; wherein the aramid fiber is a mixture of chopped fiber of para-aramid fiber and fibrid of meta-aramid fiber;
immersing the aramid fiber/glass fiber paper into a phenolic resin/alcohol mixed solution, and drying after the immersion is finished to obtain dried paper;
and carrying out hot pressing treatment on the dried paper to obtain the electric insulation paper material.
Further, when the glass fiber is mixed with the aramid fiber, the mass ratio of the glass fiber to the aramid fiber is (1-3): 9-7; wherein, in the aramid fiber, the mass fraction of the fibrid of meta-aramid fiber is 5-30%, and the rest is chopped fiber of para-aramid fiber.
Further, the chopped fibers of the para-aramid fibers are washed chopped fibers of the para-aramid fibers;
the process of obtaining the washed chopped fibers of the para-aramid fiber comprises the following steps:
and cleaning the sizing agent remained in the production of the chopped fibers of the para-aramid fibers by adopting sodium dodecyl benzene sulfonate, and drying to obtain the washed chopped fibers of the para-aramid fibers.
Further, the mass fraction of the phenolic resin in the phenolic resin/alcohol mixed solution is 1-15 wt%.
Further, the preparation process of the phenolic resin/alcohol mixed solution comprises the following specific steps:
mixing phenolic resin and alcohol according to the mass ratio of (10-150) to (850-990), and stirring to obtain phenolic resin/alcohol mixed solution.
Further, when the aramid fiber/glass fiber paper is immersed into the phenolic resin/alcohol mixed solution, the immersion time is 1-10min.
Further, in the process of carrying out hot pressing treatment on the dried paper to obtain the electric insulation paper material, the hot pressing temperature is 150-220 ℃, the hot pressing pressure is 5-15MPa, and the time is 5-15min.
The invention also provides an electrical insulation paper material, which is prepared by using the preparation method of the electrical insulation paper material.
Further, the breaking strength of the electrical insulation paper material is 70-130MPa, and the electrical strength is 6-15KV/mm.
The invention also provides application of the electric insulation paper material, and application of the electric insulation paper in new energy automobiles or trains.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides an electrical insulation paper material and a preparation method thereof, wherein glass fibers and aramid fibers are mixed, and after fluffing and forming, aramid fiber/glass fiber paper is obtained, because the aramid fibers and the glass fibers have excellent insulation performance, chemical stability, high temperature resistance and mechanical strength; the chopped fibers and glass fibers of the para-aramid are used as a framework to provide support for paper, and the fibrid of the meta-aramid is filled between the chopped fibers and the glass fibers of the para-aramid, so that the paper is shaped and the electrical insulation performance is improved; in addition, the aramid fiber and the glass fiber respectively provide excellent flexibility and rigidity for the insulating paper; secondly, the aramid fiber/glass fiber paper is soaked in the phenolic resin/alcohol mixed solution, and the soaked phenolic resin fills the pores inside the paper, so that the insulating property of the paper is improved; after the hot pressing treatment, the phenolic resin is bonded and solidified, so that the interfacial bonding force among all the fibers of the insulating paper is improved, and the insulating performance and the mechanical strength of the paper are further improved.
Drawings
FIG. 1 is a surface SEM image of an unwashed aramid/glassine paper of example 1;
FIG. 2 is a surface SEM image of an electrical insulation paper material prepared in example 2;
fig. 3 is a stress-strain curve of the electrical insulation paper material prepared in example 3.
FIG. 4 is a cross-sectional SEM image of an electrically insulating paper material prepared in example 4;
fig. 5 is a graph of breakdown voltage versus fibrids of meta-aramid for an electrical insulation paper material according to the present invention.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the following specific embodiments are used for further describing the invention in detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides a preparation method of an electrical insulation paper material, which comprises the following steps:
step 1, mixing glass fiber and aramid fiber according to the mass ratio of (1-3) (9-7), and sequentially performing fluffing, wet forming, cold pressing and squeezing and vacuum drying treatment to obtain aramid/glass fiber paper; wherein the aramid fiber is a mixture of chopped fiber of para-aramid fiber and fibrid of meta-aramid fiber; in the aramid fiber, the mass fraction of fibrid of meta-aramid fiber is 5% -30%, and the rest is chopped fiber of para-aramid fiber;
step 2, dipping the aramid fiber/glass fiber paper into a phenolic resin/alcohol mixed solution for 1-10min, and drying after the dipping is completed to obtain dried paper; wherein the mass fraction of the phenolic resin in the phenolic resin/alcohol mixed solution is 1-15 wt%; the preparation process of the phenolic resin/alcohol mixed solution specifically comprises the following steps: mixing phenolic resin and alcohol according to the mass ratio of (10-150) to (850-990), and stirring to obtain phenolic resin/alcohol mixed solution.
Step 3, carrying out hot pressing treatment on the dried paper to obtain the electrical insulation paper material; wherein the hot pressing temperature is 150-220 ℃, the hot pressing pressure is 5-15MPa, and the time is 5-15min.
The preparation principle is as follows:
according to the preparation method of the electrical insulation paper material, the aramid fiber is used as a high-performance fiber with outstanding insulation performance, and has the properties of high strength, high modulus, acid and alkali resistance, temperature resistance and flame retardance, and has remarkable advantages when being used as insulation paper; the traditional aramid paper is continuously operated at high temperature, and certain shrinkage can occur, so that the rigid glass fiber is added into the aramid paper, so that the insulating paper material has certain rigidity, the ductility of the insulating paper is reduced, and the thermal shrinkage rate of the paper is reduced at high temperature; meanwhile, the glass fiber is also used as a fiber with good insulation performance, and the insulation performance of the paper is not reduced after the glass fiber is added into the paper; compared with aramid fiber, the glass fiber has low price, can greatly reduce the cost of the insulating paper, and is more suitable for mass production; secondly, the aramid fiber has the defect of moisture absorption as a high-performance fiber, and after the aramid fiber is prepared into paper, the pure aramid fiber paper has loose structure, and a large number of pores exist on the surface and in the paper; therefore, the pure aramid paper also has moisture absorption performance and is not easy to dry, which seriously affects the insulation performance of the insulation paper, the surface and the internal pores of the paper are filled after being impregnated by the phenolic resin, the surface of the fiber is coated by the phenolic resin, and the moisture absorption performance is greatly reduced; after hot pressing, the phenolic resin is solidified, and the fibrid of meta-aramid is softened and bonded together, so that the interfacial binding force between the fibrid, the chopped fiber and the glass fiber is greatly improved, the strength of the insulating paper material is improved by more than tens times, and the elongation at break is also improved by about 50%; secondly, after the hot pressing treatment, the fiber is tightly and flatly arranged on the surface and the section of the paper, and the pores disappear; therefore, the conductive particles are more hindered by migration under the action of the electric field, and thus exhibit more excellent electrical insulation performance.
Example 1
The embodiment 1 provides a method for preparing an electrical insulation paper material, comprising the following steps:
step 1, adding 10g of phenolic resin into 990g of alcohol, and stirring for 1h to prepare a phenolic resin/alcohol mixed solution; wherein the mass fraction of the phenolic resin in the phenolic resin/alcohol mixed solution is 1% wt.
And 2, cleaning a sizing agent remained in the production of the chopped fibers of the para-aramid fibers by adopting Sodium Dodecyl Benzene Sulfonate (SDBS), and drying to obtain the washed chopped fibers of the para-aramid fibers.
Step 3, mixing the chopped fiber of the para-aramid fiber after cleaning with the fibrid of the meta-aramid fiber to obtain the aramid fiber; specifically, the mass fraction of fibrid of aramid fiber at the middle position of the aramid fiber is 5%, and the rest is chopped fiber of para-aramid fiber.
Step 4, mixing glass fibers and the aramid fibers according to a mass ratio of 1:9, and then fluffing 20000 turns by using a fluffer; then, wet forming process is utilized to obtain wet paper web; after carrying out cold pressing and squeezing treatment on the wet paper web, drying by adopting a dryer to obtain aramid fiber/glass fiber paper; wherein, the pressure is 0.2MPa and the time is 10min when the cold pressing is carried out; when the drying is carried out by adopting a dryer, the temperature is 100 ℃ and the time is 15min.
And 5, dipping the aramid fiber/glass fiber paper into the phenolic resin/alcohol mixed solution for 1min, and drying at room temperature for 12h after the dipping is finished to obtain the dried paper.
Step 6, carrying out hot pressing treatment on the dried paper to obtain the electrical insulation paper material; wherein the hot pressing temperature is 150 ℃, the hot pressing pressure is 5MPa, and the time is 15min.
And (3) performance detection:
performance tests were carried out on the electrical insulating paper material prepared in this example 1, and as a result, it was found that: the electrical insulation paper material has higher mechanical property and insulation property; wherein the breaking strength of the electrical insulation paper material is 70MPa, and the electrical strength is 6KV/mm.
Example 2
The embodiment 2 provides a method for preparing an electrical insulation paper material, comprising the following steps:
step 1, adding 40g of phenolic resin into 960g of alcohol, and stirring for 1h to prepare a phenolic resin/alcohol mixed solution; wherein the mass fraction of the phenolic resin in the phenolic resin/alcohol mixed solution is 4% wt.
And 2, cleaning a sizing agent remained in the production of the chopped fibers of the para-aramid fibers by adopting Sodium Dodecyl Benzene Sulfonate (SDBS), and drying to obtain the washed chopped fibers of the para-aramid fibers.
Step 3, mixing the chopped fiber of the para-aramid fiber after cleaning with the fibrid of the meta-aramid fiber to obtain the aramid fiber; specifically, the mass fraction of fibrid of aramid fiber at the middle position of the aramid fiber is 10%, and the rest is chopped fiber of para-aramid fiber.
Step 4, mixing glass fibers and the aramid fibers according to a mass ratio of 2:8, and then fluffing for 22000 turns by using a fluffer; then, wet forming process is utilized to obtain wet paper web; after carrying out cold pressing and squeezing treatment on the wet paper web, drying by adopting a dryer to obtain aramid fiber/glass fiber paper; wherein, the pressure is 0.3MPa and the time is 9min when the cold pressing is carried out; when the drying is carried out by adopting a dryer, the temperature is 103 ℃ and the time is 13min.
And 5, soaking the aramid fiber/glass fiber paper into the phenolic resin/alcohol mixed solution for 3min, and drying at room temperature for 12h after the soaking, so as to obtain the dried paper.
Step 6, carrying out hot pressing treatment on the dried paper to obtain the electrical insulation paper material; wherein the hot pressing temperature is 170 ℃, the hot pressing pressure is 7MPa, and the time is 13min.
And (3) performance detection:
performance testing of the electrical insulation paper material prepared in this example 2 revealed that: the electrical insulation paper material has higher mechanical property and insulation property; wherein the breaking strength of the electrical insulation paper material is 81MPa, and the electrical strength is 8KV/mm.
Example 3
Embodiment 3 provides a method for preparing an electrical insulation paper material, comprising the following steps:
step 1, adding 70g of phenolic resin into 930g of alcohol, and stirring for 1h to prepare a phenolic resin/alcohol mixed solution; wherein the mass fraction of the phenolic resin in the phenolic resin/alcohol mixed solution is 7% wt.
And 2, cleaning a sizing agent remained in the production of the chopped fibers of the para-aramid fibers by adopting Sodium Dodecyl Benzene Sulfonate (SDBS), and drying to obtain the washed chopped fibers of the para-aramid fibers.
Step 3, mixing the chopped fiber of the para-aramid fiber after cleaning with the fibrid of the meta-aramid fiber to obtain the aramid fiber; specifically, the mass fraction of fibrid of aramid fiber at the middle position of the aramid fiber is 15%, and the rest is chopped fiber of para-aramid fiber.
Step 4, mixing glass fibers and the aramid fibers according to a mass ratio of 3:7, and then fluffing 24000 turns by using a fluffer; then, wet forming process is utilized to obtain wet paper web; after carrying out cold pressing and squeezing treatment on the wet paper web, drying by adopting a dryer to obtain aramid fiber/glass fiber paper; wherein, the pressure is 0.4MPa and the time is 8min when the cold pressing is carried out; when the drying is carried out by adopting a dryer, the temperature is 106 ℃ and the time is 11min.
And 5, dipping the aramid fiber/glass fiber paper into the phenolic resin/alcohol mixed solution for 5min, and drying at room temperature for 12h after the dipping is finished to obtain the dried paper.
Step 6, carrying out hot pressing treatment on the dried paper to obtain the electrical insulation paper material; wherein the hot pressing temperature is 190 ℃, the hot pressing pressure is 9MPa, and the time is 11min.
And (3) performance detection:
performance testing of the electrical insulation paper material prepared in this example 3 revealed that: the electrical insulation paper material has higher mechanical property and insulation property; wherein the breaking strength of the electrical insulation paper material is 92MPa, and the electrical strength is 10.1KV/mm.
Example 4
Embodiment 4 provides a method for preparing an electrical insulation paper material, comprising the following steps:
step 1, adding 100g of phenolic resin into 900g of alcohol, and stirring for 1h to prepare a phenolic resin/alcohol mixed solution; wherein the mass fraction of the phenolic resin in the phenolic resin/alcohol mixed solution is 10% wt.
And 2, cleaning a sizing agent remained in the production of the chopped fibers of the para-aramid fibers by adopting Sodium Dodecyl Benzene Sulfonate (SDBS), and drying to obtain the washed chopped fibers of the para-aramid fibers.
Step 3, mixing the chopped fiber of the para-aramid fiber after cleaning with the fibrid of the meta-aramid fiber to obtain the aramid fiber; specifically, the mass fraction of fibrid of aramid fiber at the middle position of the aramid fiber is 20%, and the rest is chopped fiber of para-aramid fiber.
Step 4, mixing glass fibers and the aramid fibers according to a mass ratio of 1:9, and then fluffing 26000 turns by using a fluffer; then, wet forming process is utilized to obtain wet paper web; after carrying out cold pressing and squeezing treatment on the wet paper web, drying by adopting a dryer to obtain aramid fiber/glass fiber paper; wherein, the pressure is 0.5MPa and the time is 7min when the cold pressing is carried out; when the drying is carried out by adopting a dryer, the temperature is 109 ℃ and the time is 9min.
And 5, dipping the aramid fiber/glass fiber paper into the phenolic resin/alcohol mixed solution for 7min, and drying at room temperature for 12h after the dipping is finished to obtain the dried paper.
Step 6, carrying out hot pressing treatment on the dried paper to obtain the electrical insulation paper material; wherein the hot pressing temperature is 210 ℃, the hot pressing pressure is 11MPa, and the time is 9min.
And (3) performance detection:
performance testing of the electrical insulation paper material prepared in this example 4 revealed that: the electrical insulation paper material has higher mechanical property and insulation property; wherein the breaking strength of the electrical insulation paper material is 101MPa, and the electrical strength is 11.2KV/mm.
Example 5
This embodiment 5 provides a method for producing an electrical insulation paper material, comprising the steps of:
step 1, adding 130g of phenolic resin into 870g of alcohol, and stirring for 1h to prepare a phenolic resin/alcohol mixed solution; wherein the mass fraction of the phenolic resin in the phenolic resin/alcohol mixed solution is 13% wt.
And 2, cleaning a sizing agent remained in the production of the chopped fibers of the para-aramid fibers by adopting Sodium Dodecyl Benzene Sulfonate (SDBS), and drying to obtain the washed chopped fibers of the para-aramid fibers.
Step 3, mixing the chopped fiber of the para-aramid fiber after cleaning with the fibrid of the meta-aramid fiber to obtain the aramid fiber; specifically, the mass fraction of fibrid of aramid fiber at the middle position of the aramid fiber is 25%, and the rest is chopped fiber of para-aramid fiber.
Step 4, mixing glass fibers and the aramid fibers according to a mass ratio of 2:8, and then fluffing 28000 turns by using a fluffer; then, wet forming process is utilized to obtain wet paper web; after carrying out cold pressing and squeezing treatment on the wet paper web, drying by adopting a dryer to obtain aramid fiber/glass fiber paper; wherein, the pressure is 0.6MPa and the time is 6min when the cold pressing is carried out; when the drying is carried out by adopting a dryer, the temperature is 112 ℃ and the time is 7min.
And 5, dipping the aramid fiber/glass fiber paper into the phenolic resin/alcohol mixed solution for 9min, and drying at room temperature for 12h after the dipping is finished to obtain the dried paper.
Step 6, carrying out hot pressing treatment on the dried paper to obtain the electrical insulation paper material; wherein the hot pressing temperature is 220 ℃, the hot pressing pressure is 13MPa, and the time is 7min.
And (3) performance detection:
performance testing of the electrical insulating paper material prepared in this example 5 revealed that: the electrical insulation paper material has higher mechanical property and insulation property; wherein the breaking strength of the electrical insulation paper material is 112MPa, and the electrical strength is 12.3KV/mm.
Example 6
Embodiment 6 provides a method for preparing an electrical insulation paper material, comprising the following steps:
step 1, adding 150g of phenolic resin into 850g of alcohol, and stirring for 1h to prepare a phenolic resin/alcohol mixed solution; wherein the mass fraction of the phenolic resin in the phenolic resin/alcohol mixed solution is 15% wt.
And 2, cleaning a sizing agent remained in the production of the chopped fibers of the para-aramid fibers by adopting Sodium Dodecyl Benzene Sulfonate (SDBS), and drying to obtain the washed chopped fibers of the para-aramid fibers.
Step 3, mixing the chopped fiber of the para-aramid fiber after cleaning with the fibrid of the meta-aramid fiber to obtain the aramid fiber; specifically, the mass fraction of fibrid of aramid fiber at the middle position of the aramid fiber is 30%, and the rest is chopped fiber of para-aramid fiber.
Step 4, mixing glass fibers and the aramid fibers according to a mass ratio of 3:7, and then fluffing for 30000 turns by a fluffer; then, wet forming process is utilized to obtain wet paper web; after carrying out cold pressing and squeezing treatment on the wet paper web, drying by adopting a dryer to obtain aramid fiber/glass fiber paper; wherein, the pressure is 0.7MPa and the time is 5min when the cold pressing is carried out; when the drying is carried out by adopting a dryer, the temperature is 115 ℃ and the time is 7min.
And 5, dipping the aramid fiber/glass fiber paper into the phenolic resin/alcohol mixed solution for 10min, and drying at room temperature for 12h after the dipping is finished to obtain the dried paper.
Step 6, carrying out hot pressing treatment on the dried paper to obtain the electrical insulation paper material; wherein the hot pressing temperature is 220 ℃, the hot pressing pressure is 15MPa, and the time is 5min.
And (3) performance detection:
performance test of the electrical insulating paper material prepared in this example 6 revealed that: the electrical insulation paper material has higher mechanical property and insulation property; wherein the breaking strength of the electrical insulation paper material is 130MPa, and the electrical strength is 15KV/mm.
As shown in fig. 1, an SEM image of the surface of the non-hot pressed aramid/glass fiber paper of example 1 is shown in fig. 1, and it can be seen from fig. 1 that the surface of the non-hot pressed aramid/glass fiber paper is loose and porous; as shown in fig. 2, a surface SEM image of the electrical insulation paper material prepared in example 2 is shown in fig. 2, and it can be seen from fig. 2 that the surface of the insulation paper material impregnated with the phenolic resin and after hot pressing is dense, so as to achieve the effect of greatly improving the paper strength and electrical insulation performance; as shown in fig. 3, the stress-strain curve of the electrical insulation paper material prepared in example 3 is shown in fig. 3, and it can be seen from fig. 3 that the strength of the insulation paper material is very high, which can reach 92MPa; the reason is that as the phenolic resin is solidified after hot pressing, fibrid softening of meta-aramid fiber and bonding of para-chopped fiber are together, the interfacial bonding force between fibers is greatly improved, and the strength of the material is further improved; as shown in fig. 4, a cross-sectional SEM image of the electrical insulation paper material prepared in example 4 is shown in fig. 4, and it can be seen from fig. 4 that the insulation paper material is very dense in cross-section, which is different from the loose porous characteristic of plain paper; as shown in fig. 5, a graph of breakdown voltage of the electrical insulation paper material according to the present invention versus fibrids of meta-aramid is shown in fig. 5, and it can be seen from fig. 5 that the breakdown voltage is proportional to the fibrid content.
According to the electrical insulation paper material and the preparation method thereof, as the aramid fiber and the glass fiber have excellent insulation performance, chemical stability, high temperature resistance and mechanical strength, the chopped fiber and the glass fiber of the para-aramid fiber are used as a framework to provide support for paper, and the fibrid of the meta-aramid fiber is filled between the chopped fiber and the glass fiber of the para-aramid fiber, so that the paper forming and the electrical insulation performance are improved; in addition, the aramid fiber and the glass fiber respectively provide certain flexibility and rigidity for the insulating paper; the impregnated phenolic resin is used for filling the pores in the paper, so that the insulation performance of the paper is improved, the phenolic resin is bonded and solidified after hot pressing, the interfacial binding force among the fibers of the insulation paper is improved, and the insulation performance and the mechanical strength of the paper are further improved.
The above embodiment is only one of the implementation manners capable of implementing the technical solution of the present invention, and the scope of the claimed invention is not limited to the embodiment, but also includes any changes, substitutions and other implementation manners easily recognized by those skilled in the art within the technical scope of the present invention.
Claims (10)
1. A method for preparing an electrical insulation paper material, comprising the steps of:
mixing glass fiber and aramid fiber, and sequentially performing fluffing, wet forming, cold pressing and squeezing and vacuum drying treatment to obtain aramid/glass fiber paper; wherein the aramid fiber is a mixture of chopped fiber of para-aramid fiber and fibrid of meta-aramid fiber;
immersing the aramid fiber/glass fiber paper into a phenolic resin/alcohol mixed solution, and drying after the immersion is finished to obtain dried paper;
and carrying out hot pressing treatment on the dried paper to obtain the electric insulation paper material.
2. The method for producing an electrical insulating paper material according to claim 1, wherein the mass ratio of glass fiber to aramid fiber is (1-3) (9-7) when glass fiber and aramid fiber are mixed; wherein, in the aramid fiber, the mass fraction of the fibrid of meta-aramid fiber is 5-30%, and the rest is chopped fiber of para-aramid fiber.
3. The method for producing an electrical insulating paper material according to claim 1, wherein the chopped fibers of the para-aramid are washed chopped fibers of the para-aramid;
the process of obtaining the washed chopped fibers of the para-aramid fiber comprises the following steps:
and cleaning the sizing agent remained in the production of the chopped fibers of the para-aramid fibers by adopting sodium dodecyl benzene sulfonate, and drying to obtain the washed chopped fibers of the para-aramid fibers.
4. The method for producing an electrical insulating paper material according to claim 1, wherein the mass fraction of the phenolic resin in the phenolic resin/alcohol mixed solution is 1% to 15% by weight.
5. The method for preparing an electrical insulation paper material according to claim 1, wherein the preparation process of the phenolic resin/alcohol mixed solution comprises the following steps:
mixing phenolic resin and alcohol according to the mass ratio of (10-150) to (850-990), and stirring to obtain phenolic resin/alcohol mixed solution.
6. The method for producing an electrical insulating paper material according to claim 1, wherein the impregnating time is 1 to 10 minutes when the aramid/glass fiber paper is impregnated into the phenolic resin/alcohol mixed solution.
7. The method for producing an electrical insulating paper material according to claim 1, wherein the thermal pressing treatment is performed on the dried paper to obtain the electrical insulating paper material, wherein the thermal pressing temperature is 150-220 ℃, the thermal pressing pressure is 5-15MPa, and the time is 5-15min.
8. An electrical insulating paper material, characterized in that the electrical insulating paper material is produced by a method for producing an electrical insulating paper material according to any one of claims 1 to 7.
9. An electrical insulating paper material according to claim 8, characterized in that the breaking strength of the electrical insulating paper material is 70-130MPa and the electrical strength is 6-15KV/mm.
10. Use of an electrically insulating paper material according to claim 8 or 9, characterized in that the electrically insulating paper is used in new energy automobiles or trains.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311278752.XA CN117230651A (en) | 2023-09-28 | 2023-09-28 | Electric insulation paper material and preparation method and application thereof |
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| GB561351A (en) * | 1942-11-11 | 1944-05-16 | Dux Chemical Solutions Company | Improvements in or relating to the impregnation of cloth and paper with phenolic resins |
| CN105484103A (en) * | 2015-10-29 | 2016-04-13 | 国网电力科学研究院武汉南瑞有限责任公司 | Preparation method for epoxy-resin-combined modified vegetable-fiber insulation paper |
| CN106223129A (en) * | 2016-07-27 | 2016-12-14 | 陕西科技大学 | A kind of preparation method of para-position meta-aramid electric insulation paper |
| CN107498952A (en) * | 2017-08-01 | 2017-12-22 | 华南理工大学 | Meta-aramid fibers/all-glass paper base copper-clad laminate and its manufacture method |
| CN108570877A (en) * | 2017-03-14 | 2018-09-25 | 南京新莱尔材料科技有限公司 | A kind of manufacturing method of high-frequency high-speed circuit board p-aramid fiber base prepreg |
| CN110158346A (en) * | 2019-05-31 | 2019-08-23 | 连云港市工业投资集团有限公司 | A kind of polyimide fiber paper based insulation material and preparation method thereof |
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Patent Citations (6)
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| GB561351A (en) * | 1942-11-11 | 1944-05-16 | Dux Chemical Solutions Company | Improvements in or relating to the impregnation of cloth and paper with phenolic resins |
| CN105484103A (en) * | 2015-10-29 | 2016-04-13 | 国网电力科学研究院武汉南瑞有限责任公司 | Preparation method for epoxy-resin-combined modified vegetable-fiber insulation paper |
| CN106223129A (en) * | 2016-07-27 | 2016-12-14 | 陕西科技大学 | A kind of preparation method of para-position meta-aramid electric insulation paper |
| CN108570877A (en) * | 2017-03-14 | 2018-09-25 | 南京新莱尔材料科技有限公司 | A kind of manufacturing method of high-frequency high-speed circuit board p-aramid fiber base prepreg |
| CN107498952A (en) * | 2017-08-01 | 2017-12-22 | 华南理工大学 | Meta-aramid fibers/all-glass paper base copper-clad laminate and its manufacture method |
| CN110158346A (en) * | 2019-05-31 | 2019-08-23 | 连云港市工业投资集团有限公司 | A kind of polyimide fiber paper based insulation material and preparation method thereof |
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