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A kind of preparation method of self-adhesive pure polyimide composite paper

A polyimide and composite paper technology, applied in the direction of synthetic cellulose/non-cellulose material pulp/paper, papermaking, paper, etc., can solve the problem of paper heat resistance decline, aramid fiber low heat resistance, composite paper machinery Performance degradation and other problems, to achieve the effect of simple treatment process, energy saving and environmental protection process, simple and controllable operation

Active Publication Date: 2020-05-29
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Polyimide insulating paper is mainly made of short fiber and pulp, while traditional polyimide paper is made of polyimide short fiber and aramid pulp, such as CN102953288A. This method is due to the mixing of aramid The heat resistance of aramid fiber and aramid fiber is lower than that of polyimide, which makes it difficult to reflect the superior performance of polyimide
Many pure polyimide insulating papers have been developed in recent years, as mentioned in CN106436441A, CN106638114A, CN106436441A, CN102352576A, in the process of preparing polyimide composite paper, adding adhesive, this method is due to the Adding it, the heat resistance of the paper will decrease, and the polyamic acid fiber is used to obtain it through cyclization, which will reduce the mechanical properties of the composite paper
However, only by hot pressing without adding adhesives, the physical entanglement of pulp is not enough, resulting in low mechanical properties of composite paper

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Under the protection of nitrogen, add 1.5L NMP, 30.37g 2,4-TDA, 48.13g MDA to the 5L polymerization kettle, after they are fully dissolved, add 155.35g BTDA to react at room temperature for 8 hours, then drop in 20.1g chemical The cyclization catalyst isocarine is subjected to a stepwise temperature-raising polymerization reaction under a condensing and reflux device, wherein the polymerization is carried out at 100°C for 3 hours, the temperature is raised to 120°C for 3 hours, and the temperature is raised to 180°C for 3 hours to obtain a polyamide with a solid content of 13%. Imine stock solution; filter, defoam, dilute to a concentration of 3wt%, use 10mL of the diluted polyimide solution with a porous syringe containing 1 to 10,000 holes, and the inner diameter of the holes is 0.05 to 1mm, at an injection speed of 5mL / min Inject into the stirred 100mL precipitation liquid, wherein the precipitation liquid is composed of water and NMP with a volume ratio of 2:8, t...

Embodiment 2

[0041] (1) Under the protection of nitrogen, add 1.5L NMP, 34.61g 2,4-TDA, 55.38g MDA to the 5L polymerization kettle, after they are fully dissolved, add 178.23g BTDA to react at room temperature for 8 hours, and then drop in 23.0g chemical The cyclization catalyst isocarine is subjected to a step-by-step polymerization reaction under the condensing and reflux device, wherein the polymerization is carried out at 100°C for 3 hours, the temperature is raised to 120°C for 3 hours, and the temperature is raised to 180°C for 3 hours to obtain a polyamide with a solid content of 15%. Imine stock solution; filter, defoam, dilute to a concentration of 3wt%, use 10mL of the diluted polyimide solution with a porous syringe containing 1 to 10,000 holes, and the inner diameter of the holes is 0.05 to 1mm, at an injection speed of 5mL / min Inject into the stirred 100mL precipitation liquid, wherein the precipitation liquid is composed of water and NMP with a volume ratio of 2:8, the tempera...

Embodiment 3

[0046] (1) Under the protection of nitrogen, add 1.5L NMP, 30.37g 2,4-TDA, 48.13g MDA to the 5L polymerization kettle, after they are fully dissolved, add 155.35g BTDA to react at room temperature for 8 hours, then drop in 20.1g chemical The cyclization catalyst isocarine is subjected to a stepwise temperature-raising polymerization reaction under a condensing and reflux device, wherein the polymerization is carried out at 100°C for 3 hours, the temperature is raised to 120°C for 3 hours, and the temperature is raised to 180°C for 3 hours to obtain a polyamide with a solid content of 13%. Imine stock solution; filter, defoam, dilute to a concentration of 5wt%, use 10mL of the diluted polyimide solution with a porous syringe containing 1 to 10,000 holes, and the inner diameter of the holes is 0.05 to 1mm, at an injection speed of 5mL / min Inject into the stirred 100mL precipitation liquid, wherein the precipitation liquid is composed of water and NMP with a volume ratio of 2:8, t...

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Abstract

The invention relates to a preparation method of self-adhesive pure polyimide composite paper. The preparation method comprises the following steps: under the protection of nitrogen, adding diamine monomers and dianhydride monomers into an aprotic polar solvent for reacting; then, adding a catalyst to perform a polymerization reaction to obtain a polyimide stock solution; filtering, defoaming, diluting, and injecting into a precipitation solution to obtain a polyimide precipitation fibre suspension; washing, filtering and drying to obtain polyimide precipitation fibres; mixing the polyimide precipitation fibres and polyimide chopped fibres to obtain a homogeneous slurry; papermaking, squeezing and drying to obtain polyimide composite paper; performing solvent spraying after-treatment, coldpressing, and drying to obtain the self-adhesive pure polyimide composite paper. According to the preparation method of the self-adhesive pure polyimide composite paper, the solvent spraying after-treatment is adopted, part precipitation fibres are dissolved, and a film-fibre coexisting state is formed after a solvent is removed so that the obtained composite paper has the strength of the film, also has the characteristics of paper, remains original heat resistance, irradiation resistance, electrical performance and the like of polyimide paper, has higher strength, and can meet the application with higher requirement on the environment.

Description

technical field [0001] The invention belongs to the technical field of polyimide composite paper, in particular to a preparation method of self-adhesive pure polyimide composite paper. Background technique [0002] Electrical insulating paper is widely used as insulating material in motors, cables, capacitors and transformers, and can also be used to prepare insulating materials such as laminated products, composite materials and prepreg materials. Insulating paper not only has good insulation performance and mechanical strength, but also has various special properties. [0003] In 1960, DuPont of the United States successfully developed Nomex paper, a high-temperature-resistant material for H-level insulation. The appearance of this insulating paper caused earth-shaking reforms in the electrical high-temperature insulation industry. With the development of my country's high-tech industry, the demand and requirements for insulating paper with high temperature resistance are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H13/26D21H21/08D21H19/14C08G73/10
CPCC08G73/1067D21H13/26D21H19/14D21H21/08
Inventor 张清华周建荣赵昕董杰吴婷婷
Owner DONGHUA UNIV
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