A kind of preparation method of poly[2,5-dihydroxy-1,4-phenylenepyridodiimidazole] fiber

A phenylene pyridine and diimidazole technology, which is applied in the field of high-performance fiber preparation, can solve the problems of unstable control of the draw ratio of the primary filaments, influence of fiber structure and performance, and inability to remove PPA quickly and effectively, and achieves good structure and reduced Phosphorus content, the effect of preventing stretching

Active Publication Date: 2017-10-31
CHINA BLUESTAR CHENGRAND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention aims to solve the problems of unstable control of the draw ratio of primary filaments in the preparation method of PIPD fiber in the prior art, PPA cannot be removed quickly and effectively, and the structure and performance of the fiber are affected. It provides a poly[2,5-bis Hydroxy-1,4-phenylene pyridodiimidazole] fiber preparation method, the method can stably control the drawing ratio of primary filaments; at the same time, it can quickly and effectively remove most of the PPA in primary filaments; after that, it can be The moisture in the PIPD primary fiber is slowly removed to obtain a PIPD fiber with good structure and high performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A method for preparing poly[2,5-dihydroxy-1,4-phenylene pyridodiimidazole] fibers, comprising the following steps: stretching the PIPD / PPA liquid crystal solution through an air gap, cooling in a quench chamber, and phosphoric acid aqueous solution The poly[2,5-dihydroxy-1,4-phenylenepyrididimidazole] fiber is obtained through the processes of coagulation, washing, multi-stage gradual drying, heat treatment and winding.

Embodiment 2

[0045] A method for preparing poly[2,5-dihydroxy-1,4-phenylene pyridodiimidazole] fibers, comprising the following steps: stretching the PIPD / PPA liquid crystal solution through an air gap, cooling in a quench chamber, and phosphoric acid aqueous solution The poly[2,5-dihydroxy-1,4-phenylenepyrididimidazole] fiber is obtained through the processes of coagulation, washing, multi-stage gradual drying, heat treatment and winding.

[0046] The air gap stretching is as follows: after the PIPD / PPA liquid crystal solution is metered by a metering pump, it is sent to the spinning assembly, and after being extruded from the spinneret, the primary filaments are stretched and oriented in an air gap at a temperature of 180°C. .

Embodiment 3

[0048] A method for preparing poly[2,5-dihydroxy-1,4-phenylene pyridodiimidazole] fibers, comprising the following steps: stretching the PIPD / PPA liquid crystal solution through an air gap, cooling in a quench chamber, and phosphoric acid aqueous solution The poly[2,5-dihydroxy-1,4-phenylenepyrididimidazole] fiber is obtained through the processes of coagulation, washing, multi-stage gradual drying, heat treatment and winding.

[0049] The air gap stretching is as follows: after the PIPD / PPA liquid crystal solution is metered by a metering pump, it is sent into the spinning assembly, and after being extruded from the spinneret, the primary filaments are stretched and oriented in an air gap at a temperature of 200°C. .

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Abstract

The invention relates to a preparation method of PIPD (poly[2,6-diimidazo-(4,5-b:4'5'-e)pyridinylene-1,4-(2,5-dihydroxy)phenylene]) fiber and belongs to the technical field of preparation of high-performance fiber. The PIPD fiber is obtained through air gap stretching, cooling in a quenching chamber, phosphoric solution curing, washing, multi-level gradual drying, heat treatment and coiling of a PIPD / PPA (polyphthalamide) liquid crystal solution. According to the method, the drawing rate of as-spun fiber can be stably controlled; meanwhile, most of PPA in the as-spun fiber can be rapidly and effectively removed; moisture in the as-spun fiber of PIPD can be slowly removed, and high-performance PIPD fiber with a good structure is obtained.

Description

technical field [0001] The present invention relates to a method for preparing fibers, more specifically, the present invention relates to a method for preparing poly[2,5-dihydroxy-1,4-phenylenepyridodiimidazole] (PIPD) fibers, belonging to high Technical field of performance fiber preparation. Background technique [0002] In 1998, Akzo Nobel in the Netherlands successfully developed poly[2,5-dihydroxy-1,4-phenylenepyridinediimidazole] (PIPD) fibers and applied for the basic patent US5674969. PIPD fiber has excellent mechanical properties: the tensile strength and tensile modulus are 5GPa and 330GPa respectively, reaching or even partially surpassing the PBO fiber known as the "King of Organic Fibers"; the compressive strength is close to that of carbon fiber, up to 1.7GPa, which is the current organic fiber. The best fiber; the excellent interfacial properties make its shear modulus about 6GPa. In addition, PIPD fiber also has excellent light aging resistance, good impac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/74D06L1/12D01D10/02D01D10/06
CPCD01D10/02D01D10/06D01F6/74D06L1/12
Inventor 付兴伟范新年许伟黄治川冉茂强胡娟
Owner CHINA BLUESTAR CHENGRAND CO LTD
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