Method for preparing colored polyimide fibers through two-step continuous production

A technology of colored polyimide fibers and colored polyimide fibers, which is applied in the field of two-step continuous production and preparation of colored polyimide fibers, can solve the problems of polyimide surface inertness, etc., and overcome the adsorption capacity Poor, strong adsorption capacity, low curing temperature effect

Active Publication Date: 2018-02-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for the continuous production and preparation of colored polyimide fibers by a two-step method. Polyimide fiber has broad application prospects in many fields such as electronics and fire protection

Method used

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  • Method for preparing colored polyimide fibers through two-step continuous production
  • Method for preparing colored polyimide fibers through two-step continuous production
  • Method for preparing colored polyimide fibers through two-step continuous production

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Using the "two-step method" dry-spraying and wet-spinning technology, a polyamic acid solution with a solid content of 15% phthalic anhydride / 4,4'-diaminodiphenyl ether structure (the solvent is DMAc) is used as the spinning dope, and after coagulation Bath molding, the coagulation bath is ethanol / water (1 / 1, v / v), washed with water, dried by hot air at 60°C, and dyed. The composition of the dyeing solution is: polyimide resin with a solid content of 5%.

[0037]

[0038] The pigment is phthalocyanine blue, accounting for 2% of the total mass of the solution, the solvent is tetrahydrofuran, and the temperature of the dyeing solution is 30°C; after dyeing, hot air drying is performed at a temperature of 80°C, and then pre-drying is performed at a temperature of 50°C for 6 hours. , cyclized at 110 ℃ for 1h, 280 ℃ cyclization for 1h to obtain blue polyimide fiber. The thermal decomposition temperature of the obtained blue polyimide fiber is higher than 490 ℃, and the th...

Embodiment 2

[0040] Using the "two-step method" dry-spraying and wet-spinning technology, a polyamic acid solution with a solid content of 13.5% biphenyl dianhydride / p-phenylenediamine structure (the solvent is DMAc) is used as the spinning stock solution, which is formed by a coagulation bath. It is DMAc / water (1 / 1, v / v), washed with water, dried with hot air at 70°C, and dyed. The composition of the dyeing solution is: polyimide resin with 3% solid content, and the structural formula is as follows:

[0041]

[0042] The pigment is Cosmetic Pink RC01 (Pigment Red 181), accounting for 1% of the total mass of the solution, the solvent is DMAc, and the temperature of the dyeing solution is 80 °C; after dyeing, hot air drying is performed at a temperature of 80 °C, and then the temperature is 50 °C. Pre-drying for 8h, cyclization at 110°C for 1h, and cyclization at 310°C for 1h to obtain orange polyimide fibers. The thermal decomposition temperature of the obtained orange polyimide fiber i...

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Abstract

The invention relates to a method for preparing colored polyimide fibers through two-step continuous production. The preparation method comprises the following steps: spinning a polyamide acid solution in an N2 environment, molding, washing, dyeing, winding, pre-drying, and performing thermal cyclization / curing, thereby obtaining the colored polyimide fibers. The method disclosed by the inventionis simple and effective, industrialized production is conveniently realized, the problem of polyimide surface inertia is effectively solved, and the method has bright application prospects. A coatingcoloring adhesive has excellent adhesiveness with the polyamide acid and polyimide, the curing temperature is low, the pigment structure is not damaged, and polyimide fibers of multiple colors can besimply prepared. Moreover, according to the prepared colored polyimide fibers, the heat resistance, solvent resistance, dielectric properties and the like of the polyimide are not reduced, and application values of the polyimide in multiple fields such as electronics and fire prevention are not reduced.

Description

technical field [0001] The invention belongs to the fields of polyimide spinning, dyeing and finishing, and particularly relates to a method for preparing colored polyimide fibers by a two-step continuous production method. Background technique [0002] Polyimide fiber is a typical high-performance fiber. Based on the intrinsic properties of the fiber, polyimide fabric also has the characteristics of heat resistance, excellent mechanical properties, solvent resistance, radiation resistance, and good dielectric properties. Excellent comprehensive performance, can be used in composite materials, high temperature filtration, military aerospace, fire protection and other technical fields. [0003] At present, polyimide fabrics, such as clothing, non-woven fabrics, etc., have expanded to a certain scale in the fields of labor protection, fire protection, and bulletproof vests. Limited by factors such as the single color of polyimide, their application scope is still relatively lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/74D01F11/08D06P3/02D06P1/52D01D5/00D06B15/00
CPCD01D5/00D01F6/74D01F11/08D06B15/00D06P1/5278D06P3/02
Inventor 张清华甘锋李琇廷董杰赵昕
Owner DONGHUA UNIV
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