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Method for preparing polyimide fiber paper

A technology of polyimide fiber and polyimide resin is applied in the field of preparation of polyimide fiber paper, which can solve the problem of high investment in equipment and products, increased bonding force between fibers, poor paper strength performance and electrical performance and other issues to achieve the effect of promoting upgrading, upgrading, and promoting development

Active Publication Date: 2013-02-13
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of preparation method of polyimide fiber paper, solve the preparation method equipment of existing polyimide fiber paper and product input high, the problem that paper strength performance and electrical performance are relatively poor, It is beneficial to reduce the energy consumption of beating and improve the evenness of the paper. At the same time, through the heat treatment of the paper, the cross-linking reaction between the fibers occurs, the bonding force between the fibers is increased, and the strength of the paper is improved, which meets its application in special fields. Require

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  • Method for preparing polyimide fiber paper

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preparation example Construction

[0021] The preparation method of polyimide fiber paper of the present invention, as figure 1 As shown, the specific steps are as follows:

[0022] Step 1: Use a standard fiber disperser to disperse the polyamic acid fiber bundles, add polyethylene oxide (PEO) equivalent to 0.02% to 0.2% of the mass of the polyamic acid fiber as a fiber dispersant, equivalent to the mass of the polyamic acid fiber 2% to 15% of aramid para-position pulp is used as a fiber binder, and a certain amount of polyamic acid fiber base paper is made in a standard paper former;

[0023] Step 2: Spray or impregnate the polyamic acid fiber base paper with a polyimide resin solution with a concentration of 1-10%, so that the polyimide resin solution is evenly distributed on the base paper surface, and place it at a temperature of 60 Dry in a blast drying oven at ~100°C for 30-120 minutes to completely evaporate the solvent in the paper;

[0024] Step 3: Prepress the impregnated and dried polyimide fiber p...

Embodiment 1

[0027] Disperse the polyamic acid fiber bundles with a standard fiber disperser, add 0.1% polyethylene oxide (PEO) as a fiber dispersant, 8% aramid para-position pulp as a fiber binder, and form it on a standard paper sheet A certain amount of polyamic acid fiber base paper is made in the machine; the polyamic acid fiber base paper is sprayed or dipped with a polyimide resin solution with a concentration of 4%, so that the polyimide resin solution is evenly distributed on the base paper surface, Place it in a blast drying oven at 80°C for 90 minutes to dry the solvent in the paper; vulcanize the impregnated and dried polyimide fiber paper on a flat plate with a temperature of 220°C and a pressure of 10MPa Machine pre-compression 4min;. After the paper sample was pre-pressed, it was placed in a vacuum high-temperature drying oven, and treated at a temperature of 350°C for 30 minutes. After the above treatment, the paper sample was taken out and cooled to obtain a polyimide fibe...

Embodiment 2

[0029] Disperse the polyamic acid fiber bundles with a standard fiber disperser, add 0.02% polyethylene oxide (PEO) as a fiber dispersant, 2% aramid para-position pulp as a fiber binder, and form it on a standard paper sheet A certain amount of polyamic acid fiber base paper is made in the machine; the polyamic acid fiber base paper is sprayed or dipped with a polyimide resin solution with a concentration of 1%, so that the polyimide resin solution is evenly distributed on the base paper surface, Dry it in a blast drying oven at 60°C for 30 minutes to completely volatilize the solvent in the paper; vulcanize the impregnated and dried polyimide fiber paper on a flat plate with a temperature of 150°C and a pressure of 3MPa Machine pre-press 10min;. After the paper sample was pre-pressed, it was placed in a vacuum high-temperature drying oven, and treated at a temperature of 300 ° C for 15 minutes. After the above treatment, the paper sample was taken out and cooled to obtain a p...

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Abstract

The invention discloses a method for preparing polyimide fiber paper, and the method comprises the following steps: firstly, carrying out dispersing treatment on a polyamide acid fiber bundle by using a standard fiber disperser, adding a fiber dispersant and a fiber binder, and then manufacturing a certain amount of polyamide acid fiber body paper in a standard paper sheet former; carrying out spraying or impregnating treatment on the polyamide acid fiber body paper by using a 1-10wt% of polyimide resin liquid, so that the polyimide resin liquid is uniformly distributed on the surface of the body paper, and drying the body paper; prepressing the body paper; and treating the body paper for 15-60 minutes at a temperature of 300-420 DEG C, and cooling the obtained product so as to obtain polyimide fiber paper. The method for preparing the polyimide fiber paper disclosed by the invention can be used for facilitating the reduction of consumption for beating and the improvement of paper evenness; and through the heat treatment on paper, a crosslinking reaction is generated among fibers, so that the binding force among fibers is increased, the strength properties of the paper are improved, and the application requirements of the paper in special fields are met.

Description

technical field [0001] The invention belongs to the cross technical field of papermaking industry and material industry, and specifically relates to a preparation method of polyimide fiber paper. Background technique [0002] Polyimide has high thermal oxidation stability, radiation resistance, corrosion resistance, electrical insulation and other excellent properties, and has become one of the important varieties of high-tech organic polymers today. Aerospace, atomic energy, communications, engineering plastics and medicine have been widely used. [0003] As an important product of polyimide, polyimide fiber has ultra-high stability and high modulus and physical strength. In view of the excellent performance of polyimide fiber, some developed countries have The application of polyimide fiber has been extended to the field of papermaking. Polyimide fiber paper has high strength and electrical properties, and its long-term use temperature can reach 300°C. ) Compared with i...

Claims

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Application Information

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IPC IPC(8): D21H13/26D21H21/08D21H21/06D21H21/10D21H17/56
Inventor 陆赵情徐强孟育吴珍
Owner SHAANXI UNIV OF SCI & TECH
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