Method for preparing water-soluble polyimide sizing agent for polyimide fiber and application thereof

A technology of polyimide fiber and polyimide, applied in the field of preparation and application of high-performance organic fiber sizing agent, can solve the problems of preparation and application methods that have not been reported in the literature, and achieve improved wettability and interfacial bonding strength , improve wear resistance and clustering, and improve the effect of surface energy

Active Publication Date: 2015-11-18
JIANGSU XIANNUO NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Because polyimide fiber is a new technology product, the sizing agent material designed and matched for its chemical structure characteristics does not yet have product to appear at

Method used

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  • Method for preparing water-soluble polyimide sizing agent for polyimide fiber and application thereof
  • Method for preparing water-soluble polyimide sizing agent for polyimide fiber and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A. Add triethylamine to the polyamic acid solution, and make it fully react to form polyamic acid salt under continuous stirring. The molar ratio of triethylamine to carboxyl in polyamic acid is 1:1;

[0027] B. Precipitate the polyamic acid salt solution obtained in step A in an acetone solution, dry and remove residual solvent after repeated washing, and obtain a polyamic acid salt solid;

[0028] C, dissolving the solid obtained in step B in a deionized aqueous solution at a concentration of 8 wt%, to obtain the sizing agent of the present invention;

[0029] D. Dilute the sizing agent obtained in step C to a concentration of 2wt%, and place it in a polyimide fiber production line. After the fibers are fully immersed in the solution, they are dehydrated in a high-temperature furnace and fully cyclized to obtain polyimide on the surface. Polyimide fibers coated with macromolecular chains.

Embodiment 2

[0031] A. Add triethanolamine to the polyamic acid solution, and make it fully react to form polyamic acid salt under continuous stirring. The molar ratio of carboxyl groups in triethanolamine and polyamic acid is 1:1;

[0032] B. Precipitate the polyamic acid salt solution obtained in step A in a blended solution of acetone and methanol, and dry to remove residual solvent after repeated washing to obtain a polyamic acid salt solid;

[0033] C, dissolving the solid obtained in step B in a deionized aqueous solution at a concentration of 12 wt%, to obtain the sizing agent of the present invention;

[0034] D. Dilute the sizing agent obtained in step C to a concentration of 2.5wt%, and place it in a polyimide fiber production line. After the fiber is fully immersed in the solution, it is dehydrated in a high-temperature furnace and fully cyclized to obtain polyimide on the surface. Polyimide fibers coated with amine macromolecular chains.

Embodiment 3

[0036] A. Add tripropylamine to the polyamic acid solution, and make it fully react to form polyamic acid salt under continuous stirring. The molar ratio of carboxyl in tripropylamine to polyamic acid is 0.5:1;

[0037] B. Precipitate the polyamic acid salt solution obtained in step A in methanol solution, dry and remove residual solvent after repeated washing, and obtain polyamic acid salt solid;

[0038] C, dissolving the solid obtained in step B in a deionized aqueous solution at a concentration of 6 wt%, to obtain the sizing agent of the present invention;

[0039] D. Dilute the sizing agent obtained in step C to a concentration of 2.5wt%, and place it in a polyimide fiber production line. After the fiber is fully immersed in the solution, it is dehydrated in a high-temperature furnace and fully cyclized to obtain polyimide on the surface. Polyimide fibers coated with amine macromolecular chains.

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Abstract

Provided are a method for preparing a water-soluble polyimide sizing agent for polyimide fiber and application thereof. The method comprises the steps of slowing adding triethylamine, triethanolamine or other weak base reagents into a polyamic acid solution, fully reacting and forming a polyamic acid salt solution; precipitating the polyamic acid salt solution in a poor solvent, and fully removing a remaining solvent and then obtaining polyamic acid salt solid; and dissolving the solid in water to obtain the water-soluble polyimide sizing agent for the polyimide fiber. The polyimide fiber soaked with the sizing agent undergoes the steps of dehydration through a high-temperature heat furnace and imidization to finish fiber sizing. The sizing agent can improve surface energy of fiber, the wettability and interface bonding strength between the sizing agent and resin matrix are improved, the wear resistance and collection property of the fiber can be improved, the high temperature resistance of the fiber in use is effectively guaranteed, and the sizing agent is approximate to zero pollution in the application process and has the use characteristic of environmental friendliness.

Description

Technical field: [0001] The invention relates to the field of preparation and application of a high-performance organic fiber sizing agent, in particular to a preparation method and application of a water-soluble polyimide sizing agent for polyimide fibers. Background technique: [0002] Polyimide (PI) fiber is a newly emerging high-performance organic fiber. It has high strength, high modulus, high temperature resistance, radiation resistance, corrosion resistance, low dielectric constant and other performance characteristics. Its huge research value and application prospects It is gradually being recognized by the majority of scientific researchers. This high-strength and high-modulus P1 fiber not only has the high-strength, high-modulus, high-low temperature resistance characteristics of carbon fibers, but also has the light weight and toughness of organic fibers, and also has good ultraviolet radiation resistance, so that it can not only be used to prepare bulletproof fa...

Claims

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Application Information

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IPC IPC(8): D06M15/59D06M101/30
Inventor 俞建刚
Owner JIANGSU XIANNUO NEW MATERIAL TECH
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