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Preparation method of high-strength weather-resistant polyimide fiber

A polyimide fiber, polyamic acid technology, applied in the chemical characteristics of fibers, rayon manufacturing, single-component synthetic polymer rayon and other directions, can solve the problem that polyimide fibers are difficult to take into account mechanical properties and weather resistance and Surface activity and other issues, to achieve excellent shielding effect, improve mechanical properties, and meet application needs

Active Publication Date: 2021-11-09
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preparing high-strength weather-resistant polyimide fibers, so as to overcome the defects that polyimide fibers in the prior art are difficult to balance good mechanical properties, weather resistance and surface activity

Method used

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  • Preparation method of high-strength weather-resistant polyimide fiber
  • Preparation method of high-strength weather-resistant polyimide fiber
  • Preparation method of high-strength weather-resistant polyimide fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Under the protection of nitrogen, in a three-necked flask, according to the molar ratio of BPDA:BIA:diamine A=10:5:5, the two diamine monomers were pre-dissolved in NMP solvent. Add BPDA in batches under protection (in 3 additions, the added mass fractions are 70%, 25%, and 5%, respectively, based on the total mass of the dianhydride monomer), the solid content is controlled at 17wt%, and fully stirred at room temperature After reacting for 24 hours, the intrinsic viscosity of the obtained solution was 3.3dl / g. Add zinc nitrate hexahydrate by blending into the polymerization solution, the mass fraction of which is 5wt% (based on the total mass of solids in the spinning solution), and ultrasonically disperse and mix evenly. Dry forming is used to prepare fibers, that is, after the spinning stock solution is filtered and degassed, it is metered and extruded by a metering pump through the spinneret holes (168 holes, 100 μm in diameter) and enters the spinning tunnel. The t...

Embodiment 2

[0047] Under the protection of nitrogen, in a three-necked flask, according to the molar ratio of BPDA:BIA:diamine C=10:7:3, the two diamine monomers were pre-dissolved in NMP solvent. Add BPDA in batches under protection (in 3 additions, the added mass fractions are 70%, 25%, and 5%, respectively, based on the total mass of dianhydride monomers), the solid content is controlled at 15wt%, and fully stirred at room temperature After reacting for 24 hours, the intrinsic viscosity of the obtained solution was 3.5dl / g. Add zinc nitrate hexahydrate by blending into the polymerization solution, the mass fraction of which is 8wt% (based on the total mass of solids in the spinning solution), and ultrasonically disperse and mix evenly. Dry forming is used to prepare fibers, that is, after the spinning stock solution is filtered and degassed, it is metered and extruded by a metering pump through the spinneret holes (168 holes, 100 μm in diameter) and enters the spinning tunnel. The temp...

Embodiment 3

[0049] Under the protection of nitrogen, in a three-necked flask, according to the molar ratio of BPDA:BIA:diamine C=10.1:5:5, the two diamine monomers were pre-dissolved in NMP solvent. Add BPDA in batches under protection (in 3 additions, the added mass fractions are 70%, 25%, and 5% respectively, based on the total mass of the dianhydride monomer), the solid content is controlled at 16wt%, and fully stirred at room temperature After reacting for 24 hours, the intrinsic viscosity of the obtained solution was 3.8dl / g. Add zinc nitrate hexahydrate by blending into the polymerization solution, the mass fraction of which is 10wt% (based on the total mass of solids in the spinning solution), and ultrasonically disperse and mix evenly. Dry forming is used to prepare fibers, that is, after the spinning stock solution is filtered and degassed, it is metered and extruded by a metering pump through the spinneret holes (168 holes, 100 μm in diameter) and enters the spinning tunnel. The...

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Abstract

The invention relates to a preparation method of a high-strength weather-resistant polyimide fiber. The method comprises the following steps of dissolving a diamine monomer containing benzimidazole and a diamine monomer containing o-hydroxybenzophenone in a solvent, adding a dianhydride monomer, carrying out a random copolymerization reaction, mixing with a zinc salt, carrying out dry spinning on the obtained spinning solution, and carrying out cyclization-drafting integrated treatment. The method can realize continuous preparation, is simple to operate, environment-friendly in process and wide in raw material source, and has a good industrialization prospect; and the prepared polyimide fiber has relatively high mechanical properties, surface activity and weather resistance.

Description

technical field [0001] The invention belongs to the technical field of high-performance fiber preparation, and in particular relates to a preparation method of a polyimide fiber with high strength and high weather resistance that can meet the application in the field of extreme environments. Background technique [0002] In recent years, with the increasing frequency of space exploration activities, higher requirements have been put forward for the designed service life and stability and reliability of spacecraft. High-performance fibers have become one of the important preferred materials for aerospace equipment and devices due to their light weight, high strength, flexibility and good heat resistance. For example, typical aramid fibers, poly-p-phenylene benzoxazole (PBO) fibers, etc. have been used as safety airbags for the "Pathfinder", "Spirit" and "Opportunity" Mars exploration rovers. However, in the Low Earth Orbit (LEO), where space exploration activities are most f...

Claims

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Application Information

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IPC IPC(8): D01F6/94D01F1/10
CPCD01F6/94D01F1/10
Inventor 张清华董杰赵昕王士华郭涛郑森森董晗张家霖
Owner DONGHUA UNIV
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