Composite dispersion method used for polyimide chopped fibers

A technology of chopped fiber and polyimide, applied in the direction of fiber type, fiber treatment, fiber raw material treatment, etc., can solve the problems of unsuitable fiber dispersion for a long time, unable to effectively prevent fiber bending and flocculation into agglomerates, etc. The effect of increasing roughness and hydrophilic ability, overcoming van der Waals force, and increasing dispersion performance

Active Publication Date: 2020-11-27
JIANGSU AOSHEN HI TECH MATERIALS CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The compound dispersion liquid in this patent is used to better disperse aramid fibers, but the dispersion liquid used cannot effectively prevent the bending and flocculation of fibers, and is not suitable for long-term dispersion of fibers in paper machines

Method used

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  • Composite dispersion method used for polyimide chopped fibers
  • Composite dispersion method used for polyimide chopped fibers
  • Composite dispersion method used for polyimide chopped fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] A method for preparing polyimide fiber base paper, comprising the steps of:

[0066] (1) Take 1000mL of water in a beaker, and add 6g of HCl into 1000mL of water at a ratio of 6.0:500 according to the mass-volume ratio g / mL to obtain an acid solution; according to the mass-volume (water) ratio g / mL is 1.0: 500 ratio, 2.0g of 3mm polyimide chopped fibers were added to the solution; the polyimide chopped fibers were filtered out through a filter screen after acid treatment at room temperature for 25min, washed with water and dried to obtain acid-treated polyimide fiber;

[0067] (2) According to the ratio of the mass volume ratio g / mL of hexamethylenediamine crystals and water to 0.9:500, and according to the ratio of 0.5:500 to the mass volume ratio g / mL of cationic surfactant CTMAB and water, weigh 1.8g Hexamethylenediamine crystals and 1.0g CTMAB were added to a beaker with 1000mL of water, and a mixed solution was obtained after the two were fully dissolved; then aci...

Embodiment 2

[0072] A method for preparing polyimide fiber base paper, comprising the steps of:

[0073] (1) Take 1000mL of water in a beaker, and mix 5.0g of H 2 SO 4 Add to 1000mL water, according to the ratio of mass volume (water) g / mL is 1.6:500, add 3.2g of 5mm polyimide chopped fibers into the solution; the polyimide chopped fibers are treated with acid at room temperature After 30 minutes, it is filtered through a filter screen, washed and dried to obtain acid-treated polyimide fibers;

[0074] (2) According to the ratio of the mass volume ratio g / mL of hexamethylenediamine crystals to water of 0.6:500, and according to the ratio of 0.4:500 of the mass volume ratio g / mL of the cationic surfactant CTMAB to water, weigh 1.2g Hexamethylenediamine crystals and 0.8g CTMAB were added to a beaker with 1000mL of water, and after the two were fully dissolved, a mixed solution was obtained; acid-treated polyimide chopped fibers were added to the mixed solution, and in a magnetic stirrer (...

Embodiment 3

[0079] A method for preparing polyimide fiber base paper, comprising the steps of:

[0080] (1) Take 1000mL of water in a beaker, and mix 10.4g of HNO 3 Add to 1000mL water, according to the ratio of mass volume (water) g / mL is 2.0:500, add 4.0g of 5mm polyimide chopped fibers into the solution; the polyimide chopped fibers are treated with acid at room temperature After 40min, it was filtered through a filter screen, washed with water and dried to obtain acid-treated polyimide fibers;

[0081] (2) According to the ratio of the mass volume ratio g / mL of hexamethylenediamine crystals and water to 0.8:500, and according to the ratio of 0.7:500 to the mass volume ratio g / mL of the cationic surfactant CTMAB and water, weigh 1.6g Hexamethylenediamine crystals and 1.4gCTMAB were added to a beaker with 1000mL of water, and a mixed solution was obtained after the two were fully dissolved; then the acid-treated polyimide chopped fibers were added to the mixed solution, and in a magnet...

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Abstract

The invention discloses a composite dispersion method used for polyimide chopped fibers, and belongs to the technical field of dispersion mechanisms. The dispersion method disclosed by the invention comprises the following steps of (1), carrying out surface modification by adopting acid, specifically, adding the polyimide chopped fibers into an acid solution for surface modification, then washingand drying; (2), carrying out surface grafting by adopting hexamethylenediamine, specifically, adding a cationic surfactant into the hexamethylenediamine solution, and uniformly mixing to obtain a mixed solution; adding the polyimide chopped fibers subjected to acid surface modification treatment into the mixed solution for surface grafting, obtaining a fiber suspension after the reaction is finished; and (3), carrying out ultrasonic treatment on the fiber suspension to obtain a uniformly dispersed polyimide chopped fiber suspension. According to the composite dispersion method used for the polyimide chopped fibers, the dispersity of the obtained fiber suspension can be as high as 45%, and preparation of high-performance polyimide paper is facilitated.

Description

technical field [0001] The invention relates to a composite dispersion method for polyimide chopped fibers, belonging to the technical field of dispersion mechanism. Background technique [0002] Polyimide (PI) fiber is an important type of high-performance fiber, with high modulus, low temperature resistance, radiation resistance, excellent dielectric properties, thermal stability and mechanical properties, so it is widely used in the defense industry , medical equipment, protective equipment and aerospace and other fields. [0003] The polyimide fiber paper-based thin-sheet functional material made by the wet forming process has excellent electrical insulation properties, and is also called polyimide fiber paper. In the papermaking process, polyimide fibers need to be fully dispersed in water, and the dispersion stability of fibers in water directly affects the formation and mechanical properties of paper. Therefore, improving the dispersion performance of polyimide fibe...

Claims

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Application Information

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IPC IPC(8): D06M11/11D06M13/332D06M10/00D06M11/55D06M11/64D06M13/463D21H13/26D06M101/30
CPCD06M11/11D06M13/332D06M10/003D06M11/55D06M11/64D06M13/463D21H13/26D06M2101/30
Inventor 王士华龙柱党洪洋胡爱林李志强郭帅李广斌
Owner JIANGSU AOSHEN HI TECH MATERIALS CO LTD
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