Fiber and preparation method thereof

A fiber and polyimide fiber technology, applied in the field of fibers, can solve the problems of poor dimensional stability, poor spinning performance and mechanical properties of polyimide fibers, and achieve good mechanical properties, superior spinning performance, and difficult fiber. shrinking effect

Active Publication Date: 2021-08-03
上海邃铸科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of fiber and its preparation method for the problems of poor spinning performance and mechanical properties of polyimide fiber and poor dimensional stability when used at high temperature for a long time

Method used

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  • Fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Put 4100g of γ-butyrolactone into a four-neck flask, raise the temperature to 70°C, and purge with nitrogen gas, the nitrogen flow rate is 3ml / min; then 453.5g of 2,3,3',4'-biphenyl Tetraformic dianhydride (Junkai Chemical) and 173.5g of p-phenylenediamine (Zhixin Chemical) were added to the flask respectively, and after stirring for 1.5h, 7.2g of polysiloxane diethyl ester (weight average molecular weight about 300, quasi-biotechnology) into the reaction system, and then stirred for 3h; then 301.4g of diethyl carbonate (TCI) was put into the reaction system, and stirred for 60min to obtain a fiber-forming polymer solution; The fiber polymer solution has a solid content of 18.4% and a weight average molecular weight of 815,300.

[0053] Then, the fiber-forming solution is spun by the common dry-wet spinning method, the spinning temperature is 130°C, after passing through the coagulation bath, then through the water washing tank, and dried by hot air at 95°C at a draft r...

Embodiment 2

[0055] Put 4100g of γ-butyrolactone into a four-neck flask, raise the temperature to 70°C, and purge with nitrogen gas at a flow rate of 3ml / min; then 529.2g of 2,3,3',4'-biphenyl Tetraformic dianhydride (Junkai Chemical) and 189.8g of p-phenylenediamine (Zhixin Chemical) were respectively added to the flask, and after stirring for 1.5 hours, 40.5g of polysiloxane (weight average molecular weight about 300, Longhui Chemical) Put it into the reaction system, stir and react for 3h; then put 172.7g of diethyl carbonate (TCI) into the reaction system, and stir for 60min to obtain the fiber-forming polymer solution; the prepared fiber-forming polymer solution , its solid content is 18.7% and its weight average molecular weight is 821,000.

[0056] Then, the fiber-forming solution is spun by the common dry-wet spinning method, the spinning temperature is 130°C, after passing through the coagulation bath, then through the water washing tank, and dried by hot air at 95°C at a draft ra...

Embodiment 3

[0058] Put 4100g of γ-butyrolactone into a four-necked flask, and raise the temperature to 70°C, and purge with nitrogen, the nitrogen flow rate is 3ml / min; then 460.3g of 2,3,3',4'-biphenyl Tetraformic dianhydride (Junkai Chemical), 162.6g of p-phenylenediamine (Zhixin Chemical) were added to the flask respectively, and after stirring for 1.5h, 40.5g of polysiloxane diethyl ester (weight average molecular weight about 300, quasi-biotechnology) into the reaction system, and then stirred for 3h; then 277.2g of diethyl carbonate (TCI) was put into the reaction system, and stirred for 60min to obtain a fiber-forming polymer solution; The fiber polymer solution has a solid content of 17.9% and a weight average molecular weight of 817,500.

[0059] Then, the fiber-forming solution is spun by the common dry-wet spinning method, the spinning temperature is 130°C, after passing through the coagulation bath, then through the water washing tank, and dried by hot air at 95°C at a draft r...

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Abstract

The invention relates to a fiber and a preparation method thereof. The preparation method comprises the following steps of carrying out polymerization reaction on dianhydride and diamine, adding siloxane and an esterifying agent, extruding an obtained fiber forming polymer solution by a solution spinning method to obtain pre-oriented nascent fibers, and carrying out drying and high-temperature cyclization treatment to obtain the high-performance polyimide fibers. A siloxane structure is introduced to a polyimide macromolecular chain, the siloxane structure is good in heat resistance and has certain flexibility, and when the siloxane structure is bonded to the polyimide macromolecular chain with relatively large rigidity, arrangement and orientation of macromolecules are facilitated; and meanwhile, an esterifying agent is introduced into a polymerization/spinning process, the hydrogen bond effect is improved, the macromolecular movement performance is improved, and finally the polyimide fiber with better mechanical performance, good high-temperature long-time use performance and excellent thermal dimensional stability can be obtained.

Description

technical field [0001] The invention relates to the field of fibers, and relates to a fiber and a preparation method thereof, in particular to a polyimide fiber with good spinning performance and good mechanical properties, and excellent dimensional stability when used at high temperature, and a preparation method thereof. The fiber provided by the invention can be applied to the fields of textile and high-strength composite materials. Background technique [0002] As a special engineering material, polyimide has been widely used in aviation, aerospace, microelectronics, nanometer, liquid crystal, separation membrane, laser and other fields. As a functional material, its huge application prospect has been fully recognized. High-performance polyimide fiber is a kind of high-performance organic fiber with excellent comprehensive performance, which has wider application prospects in the fields of aerospace, advanced weapons, electronic communications, special protection and ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/78
CPCD01F6/78Y02P70/62
Inventor 朱荫建许翔
Owner 上海邃铸科技有限公司
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