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PBO (poly-p-phenylene benzobisoxazole) fiber molecular structure modification method

A molecular structure and fiber technology, which is applied in the field of PBO fiber molecular structure modification, can solve the problems of fiber strength reduction, etc., and achieve the effect of reducing mutual attraction, reducing interaction energy, and improving interface bonding

Inactive Publication Date: 2016-07-13
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for modifying the molecular structure of PBO fibers, which solves the problem that the strength of the fibers decreases after the molecular structure of the existing PBO fibers is modified.

Method used

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  • PBO (poly-p-phenylene benzobisoxazole) fiber molecular structure modification method
  • PBO (poly-p-phenylene benzobisoxazole) fiber molecular structure modification method
  • PBO (poly-p-phenylene benzobisoxazole) fiber molecular structure modification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Step 1, prepare multi-component compound acid finishing agent:

[0040] Weigh the following raw materials according to mass percentage: 5% polyphosphoric acid, 3.5% non-oxidative inorganic acid, 0.5% non-ionic surfactant, 0.1% stabilizer, and the balance is deionized water. The sum of the mass percentages of the above components is 100%; Mix the weighed raw materials at room temperature for 5-10 minutes to make them evenly combined to obtain a multi-component composite acid finishing agent.

[0041] Among them, the polyphosphoric acid is polyphosphoric acid; the non-oxidizing inorganic acid is boric acid; the nonionic surfactant is Tween; the stabilizer is phosphite.

[0042] Step 2, surface treatment of PBO fiber with multi-component compound acid finishing agent:

[0043] 2.1 Use alcohol and deionized water to remove impurities on the surface of the PBO fiber and dry it;

[0044] 2.2 Dilute the multi-component composite acid finishing agent prepared in step 1. The d...

Embodiment 2

[0047] Step 1, prepare multi-component compound acid finishing agent:

[0048] Weigh the following raw materials according to mass percentage: 7% polyphosphoric acid, 5.5% non-oxidative inorganic acid, 0.75% non-ionic surfactant, 0.3% stabilizer, and the balance is deionized water. The sum of the mass percentages of the above components is 100%; Mix the weighed raw materials at room temperature for 5-10 minutes to make them evenly combined to obtain a multi-component composite acid finishing agent.

[0049] Among them, the polyphosphoric acid polyphosphoric acid; the non-oxidizing inorganic acid is glacial acetic acid; the nonionic surfactant is fatty alcohol polyoxyethylene ether; the stabilizer is epoxy resin.

[0050] Step 2, surface treatment of PBO fiber with multi-component compound acid finishing agent:

[0051] 2.1 Use alcohol and deionized water to remove impurities on the surface of the PBO fiber and dry it;

[0052]2.2 Dilute the multi-component composite acid fin...

Embodiment 3

[0055] Step 1, prepare multi-component compound acid finishing agent:

[0056] Weigh the following raw materials according to mass percentage: 10% of polyphosphoric acid, 7% of non-oxidizing inorganic acid, 1% of nonionic surfactant, 0.5% of stabilizer, and the balance is deionized water. The sum of the mass percentages of the above components is 100%; Mix the weighed raw materials at room temperature for 5-10 minutes to make them evenly combined to obtain a multi-component composite acid finishing agent.

[0057] Wherein, the polybasic phosphoric acid is pyrophosphoric acid; the non-oxidizing inorganic acid is commercially available analytically pure hydrochloric acid (mass fraction is 36-38%); the nonionic surfactant is polyoxyethylene ester; the stabilizer is ethanolamine.

[0058] Step 2, surface treatment of PBO fiber with multi-component compound acid finishing agent:

[0059] 2.1 Use alcohol and deionized water to remove impurities on the surface of the PBO fiber and d...

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Abstract

The invention discloses a PBO (poly-p-phenylene benzobisoxazole) fiber molecular structure modification method.The PBO fiber molecular structure modification method particularly includes subjecting PBO fibers to modified treatment in a polyatomic recombination acid finishing agent, drying and curing so as to complete modification of PBO fibers.The PBO fiber molecular structure modification method has the advantages that PBO fiber modified treatment is conducted through compounding of polyatomic phosphoric acid and oxidation-free inorganic acid, and PBO fiber surface layers can be dissolved and etched and even can expose microfibers to increase roughness of the fiber surfaces, so that fiber and resin interface bonding is achieved with the PBO mechanical property being kept unchanged basically.

Description

technical field [0001] The invention belongs to the field of modification of composite materials and relates to a method for modifying the molecular structure of PBO fibers. Background technique [0002] Poly-p-phenylene benzobisoxazole (referred to as PBO) fibers have high strength and heat resistance, and are widely used, especially in defense applications. The fiber macromolecular structure is arranged neatly, and the degree of crystallinity and orientation is high. Due to the regular and orderly orientation structure of PBO molecules, the surface of the fiber is very smooth, and most of the polar heteroatoms on the molecular chain are wrapped inside the fiber, and the polarity of the fiber surface is also very small, which makes the fiber show strong chemical inertness. , the connection between the fiber and the matrix is ​​weak. Therefore, it is necessary to change the surface roughness of the fiber and increase the interfacial bonding performance between the fiber an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/72D06M11/82D06M13/292D06M13/188D06M15/55D06M11/13D06M13/368D06M11/70D06M101/30
CPCD06M11/13D06M11/70D06M11/72D06M11/82D06M13/188D06M13/292D06M13/368D06M15/55D06M2101/30
Inventor 谭艳君刘昌南霍倩刘姝瑞李文燕
Owner XI'AN POLYTECHNIC UNIVERSITY
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