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A kind of polyimide micro-denier fiber and its preparation method

A polyimide, micro-denier technology, applied in fiber processing, conjugated synthetic polymer rayon, chemical post-processing of synthetic polymer rayon, etc., can solve the problem of high breakage rate, low production efficiency, The problem of high dry unevenness can achieve the effect of low cost, improved production efficiency and excellent comprehensive performance.

Active Publication Date: 2019-06-07
CHANGCHUN HIPOLYKING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of high broken end rate, high evenness unevenness and low production efficiency in the existing preparation method of polyimide micro-denier fiber, the present invention provides a polyimide with high production efficiency and stable quality Micro-denier fiber and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0052] Step 3, preparation of nascent fiber

[0053] Use the metering pump to accurately measure the polyamic acid spinning solution I and the second component spinning solution II according to the calculated ratio, and then pump them into the mixing hopper respectively, and carry out sufficient mixing and stirring to ensure uniform mixing to obtain the mixture B, In the mixture B, the mass percentage of the polyamic acid spinning solution I is 40-70%, and the mass percentage of the second component spinning solution II is 60-30%, and they are uniformly mixed and sprayed out through the porous spinneret. The hole diameter of the spinneret is 0.04-0.1mm, and the two-component mixed primary fiber is obtained.

[0054] Step 4, post-treatment of as-spun fibers (including the removal of the second component and post-treatment of polyamic acid as-spun fibers)

[0055] The mixed as-spun fibers with two components prepared in Step 3 are gradually passed through the dissolution pool 1...

Embodiment 1

[0060] Embodiment 1PMDA / ODA polyamic acid solution, blended spinning with PVA solution

[0061] Step 1, the preparation of polyamic acid spinning solution I

[0062] Reactor I with stirring device, add DMAC; Open stirring device, under nitrogen (N 2 ) under the protection of adding a certain amount of ODA until dissolved without obvious particles; then PMDA is added to the reaction kettle I according to the ratio of 0.95:1 molar ratio with ODA, the total amount of ODA and PMDA added can make the polyamic acid The solid content of the solution is 15%, reacted at a temperature of 20°C for 8 hours to obtain a polyamic acid spinning solution I, the apparent viscosity of the polyamic acid spinning solution I is 180000cp, vacuum defoaming for 12 hours after filtration .

[0063] Step 2, the preparation of the second component spinning solution II

[0064] Reactor II with a stirring device, add DMAC, slowly add polyvinyl alcohol (PVA) into the reactor II, polyvinyl alcohol (PVA) r...

Embodiment 2

[0069] Embodiment 2 PMDA, BPDA / ODA polyamic acid solution, blend spinning with PVP solution

[0070] Step 1, the preparation of polyamic acid spinning solution I

[0071] Reactor I with stirring device, add NMP; Open stirring device, in nitrogen (N 2 ) under the protection of adding a certain amount of ODA until dissolved without obvious particles; then the dianhydride (the mixture of PMDA and BPDA, wherein the molar ratio of PMDA and BPDA is 0.7:0.3) according to the ratio of 1:1 to the ODA molar ratio Added in the reaction kettle I, the total amount of ODA and dianhydride (the mixture of PMDA and BPDA) added can make the polyamic acid solution solid content be 16%, react 15h under the condition of 10 ℃ of temperature, obtain polyamic acid spinning Silk solution I, the polyamic acid spinning solution I has an apparent viscosity of 250000cp, is vacuum degassed for 8 hours after filtration and then used for later use.

[0072] Step 2, the preparation of the second component s...

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Abstract

The invention discloses a polyimide microdenier fiber and a preparation method of the polyimide microdenier fiber, and belongs to the field of fiber preparation. The polyimide microdenier fiber and the preparation method solve the problems of high end breakage rate, high yarn unevenness rate and low production efficiency of the conventional preparation method of the polyimide microdenier fiber. The preparation method of the polyimide microdenier fiber comprises the following steps: dissolving soluble components in a polyamide acid bicomponent nascent fiber by solvents, and then performing washing, drying, thermal imidization and drafting treatment. The filament number of the polyimide microdenier fiber is 0.5-1.1dtex; the tensile strength of the polyimide microdenier fiber is equal to or greater than 4.0cN / dtex. The preparation method is simple, convenient and quick in spinning technology, low in production cost, stable and safe in spinning process, energy-saving and environmentally friendly; industrial and continuous production is easy to realize; the organic solvents used in the spinning process are easy to recycle; a spinning end breakage rate is reduced; a yarn unevenness rate is increased; the production efficiency is further improved. The polyimide microdenier fiber obtained by the preparation method is excellent in comprehensive performance.

Description

technical field [0001] The invention belongs to the technical field of fiber preparation, and in particular relates to a polyimide micro-denier fiber and a preparation method thereof. Background technique [0002] Polyimide fiber is a high-performance fiber, and the high-temperature-resistant polyimide fiber is one of the organic synthetic fibers with the highest temperature at present. It can be used at 250-350°C, and has light resistance, water absorption, and Thermal and other aspects are superior to aramid and polyphenylene sulfide fibers. High-performance polyimide fiber is one of the organic synthetic fibers with the best mechanical properties at present, and is widely used in aerospace, environmental protection, fire prevention and other fields. Compared with polyimide fibers with conventional fineness, polyimide micro-denier fibers have more special properties, such as large specific surface area, high temperature resistance, low thermal conductivity, etc., such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F8/16D01F8/10D01F11/06D01F11/08D01D5/30D01D10/06C08G73/10
CPCC08G73/1071D01D5/30D01D10/06D01F8/10D01F8/16D01F11/06D01F11/08
Inventor 刘建国付饶滕仁岐杨诚
Owner CHANGCHUN HIPOLYKING