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Transparent fiber and preparation method thereof

A transparent fiber and fiber technology, which is applied in the fiber field, can solve the problems of polyimide fiber transparency and poor spinning performance, and achieve the effect of excellent solution spinning conditions, excellent spinning performance and improved fluidity

Active Publication Date: 2021-08-13
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 solve the problems of poor transparency and spinning performance of polyimide fibers, and to provide a transparent fiber and its preparation method, in particular to a near-infrared light field (780-2526nm) with high transparency Permanent polyimide fiber and preparation method thereof

Method used

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  • Transparent fiber and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0049] Put 626.5g of γ-butyrolactone into a four-necked flask, and raise the temperature to 55°C, and purge with nitrogen gas at a flow rate of 2ml / min; then 214.8g of 4,4'-(hexafluoroisopropene) Add diphthalic anhydride (Junkai Chemical) and 52.4g of p-phenylenediamine (Zhixin Chemical) into the flask respectively, then rinse the beaker with 600g of γ-butyrolactone and put the rinse solution into the flask; stir while reacting After 4.5 hours of reaction, the fiber-forming polymer solution is obtained; the solid content of the prepared fiber-forming polymer solution is 18.3% and the weight average molecular weight is 587,300.

[0050] Then, the fiber-forming polymer solution is spun by ordinary dry-wet spinning method, the spinning temperature is 110°C, after passing through the coagulation bath, then through the water washing tank, and dried by 80°C hot air at a draft ratio of 0.9 times to obtain Nascent fiber; finally, the nascent fiber is dried and drawn at 280°C and 2.3 t...

Embodiment 2

[0052] Put 668.5g of γ-butyrolactone into a four-necked flask, and raise the temperature to 55°C, and purge with nitrogen gas at a flow rate of 1ml / min; then 148.9g of 4,4'-(hexafluoroisopropene) Add diphthalic anhydride (Junkai Chemical) and 37.7g of p-phenylenediamine (Zhixin Chemical) into the flask respectively, then rinse the beaker with 400g of γ-butyrolactone and put the rinse solution into the flask; stir while reacting After 4.5 hours of reaction, 47.9g of N,N-dimethylformamide dimethyl acetal (TIC) was put into the reaction system and stirred for 30 minutes to obtain a fiber-forming polymer solution; The fiber-forming polymer solution has a solid content of 17.9% and a weight average molecular weight of 510,300.

[0053] Then, the fiber-forming polymer solution is spun by ordinary dry-wet spinning method, the spinning temperature is 110°C, after passing through the coagulation bath, then through the water washing tank, and dried by 80°C hot air at a draft ratio of 0....

Embodiment 3

[0055] Put 1039.4g of γ-butyrolactone into a four-neck flask, raise the temperature to 55°C, and purge with nitrogen gas at a flow rate of 2ml / min; then 156.6g of 3,3',4,4'-linked Add benzenetetracarboxylic dianhydride (Junkai Chemical) and 181.8g of 4,4'-diaminooctafluorobiphenyl (Alpha Chemical) into the flask respectively, then rinse the beaker with 600g of γ-butyrolactone and rinse The solution was also put into the flask; stirring while reacting, after 4.5 hours of reaction, then 21.6g polysiloxane diethyl ester (weight average molecular weight about 300, Zhenzhun Biotechnology) was put into the reaction system, and then stirred After 1.5 hours, the fiber-forming polymer solution was obtained; the solid content of the prepared fiber-forming polymer solution was tested to be 18.2%, and the weight-average molecular weight was 504,000.

[0056]Then, the fiber-forming polymer solution is spun by ordinary dry-wet spinning method, the spinning temperature is 110°C, after passin...

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Abstract

The invention relates to transparent fiber and a preparation method thereof. The transparent fiber contains a polyimide structure, and the polyimide structure also contains a fluorine substituent structure; the transparent fiber further contains a silicon-oxygen bond structure; the light transmittance of the transparent fiber in the near-infrared light field can reach 90% or above, and the light refractive index is 1.3-1.6; and the silicon-oxygen bond structure accounts for 0.5-10% of the weight of the whole fiber, and the weight-average molecular weight is 2000 or below. The preparation method of the transparent fiber comprises the following steps of carrying out a polymerization reaction on dianhydride and diamine, adding a siloxane structure and an esterifying agent, extruding an obtained fiber forming polymer solution by a solution spinning method to obtain nascent fiber, and carrying out drying and high-temperature cyclization treatment to obtain the transparent polyimide fiber. The fluorine-containing polyimide can improve the transparency, the existence of the silicon-oxygen structure can further improve the transparency, and meanwhile, the process is improved, so that the fiber forming performance is relatively good, and the spinning performance is relatively good.

Description

technical field [0001] The invention relates to the field of fibers, in particular to a polyimide fiber with higher transparency in the field of near-infrared light and a preparation method thereof. It also relates to optical communication materials and devices, electronic devices, semiconductor devices, aerospace equipment and the like using the transparent fiber. 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 advanced composite materials. [0003] The prior patent with application ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/74C08G73/10
CPCD01F6/74C08G73/1039C08G73/1067C08G73/106C08G73/1075
Inventor 朱荫建许翔
Owner 上海邃铸科技有限公司
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