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Preparation method of PBO fiber composite material

A fiber composite material and fiber technology, which is applied in the field of composite material preparation, can solve problems such as unsatisfactory effect and reinforced interface force between fiber and resin matrix, so as to avoid loss, improve wettability and cohesiveness, and smoothly transfer stress Effect

Active Publication Date: 2017-06-09
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the literature and patent methods that have been published in this regard mostly improve the polarity of the fiber surface through a more optimized surface treatment process for PBO fibers, introduce active groups, and enhance the interfacial force between the fiber and the resin matrix. Its effect is not ideal enough

Method used

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  • Preparation method of PBO fiber composite material
  • Preparation method of PBO fiber composite material
  • Preparation method of PBO fiber composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Add 0.1 mole of phthalic anhydride, 0.13 mole of 2-aminophenol and 130ml of glacial acetic acid into a three-necked flask equipped with a stirring bar, a thermometer, and a condensing reflux device, mix and heat up and reflux for 6 hours. After the reaction, the reaction solution was cooled to room temperature. After the precipitate was completely separated out, it was filtered, washed and precipitated with 350 ml of methanol to remove unreacted raw materials. The final product was dried in a vacuum oven at 70°C for 12 hours. Product 1 was obtained as a white solid powder.

[0036] 2. After fully mixing 0.1 mole of product 1, 0.13 mole of aniline, 0.12 mole of paraformaldehyde and 30 ml of xylene, raise the temperature to 120°C and stir for 6 hours. After the reaction, the reaction liquid was poured out into the beaker, the unreacted raw materials were washed and removed, and the temperature was slowly lowered in the fume hood for recrystallization. After filtrati...

Embodiment 2

[0044] In this example, only the aromatic amine in the second step is different from Example 1, and thus the charging ratio in Step 2 is also different, and the rest are the same as Example 1.

[0045] In step 2, the feed ratio is: 0.1 mole of product 1, 0.6 mole of aromatic amine, 0.12 mole of paraformaldehyde and 30 ml of xylene.

[0046] The chemical structural formula of aromatic amine in the present embodiment is as follows:

[0047]

Embodiment 3

[0049]In this embodiment, only the aromatic acid anhydride in the first step is different from embodiment 1, and the charging ratio in step 1 thus caused is also different, and the rest are the same as embodiment 1.

[0050] In step 1, the feed ratio is: 0.05 mole of aromatic acid anhydride, 0.13 mole of 2-aminophenol and 130 ml of glacial acetic acid.

[0051] The chemical structural formula of the aromatic acid anhydride in the present embodiment is as follows:

[0052]

[0053] The advantage of the present invention is that a resin with good compatibility with PBO fibers is introduced into the matrix resin as a mixed resin, which can significantly improve the wettability and adhesion of PBO fibers to the matrix resin, thereby significantly improving the interface properties of the resin and fibers .

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Abstract

The invention relates to a preparation method of a PBO fiber composite material. The preparation method comprises the following steps: (1) adding a solvent which is 1-3 times of the mass of matrix resin into 50-80 parts by mass of the matrix resin, so as to prepare a glue material; (2) soaking 100 parts by mass of PBO fibers into the glue material obtained in the step (1), winding, airing to obtain a prepreg, paving the prepreg into a mold, carrying the preheating at 100 DEG C for 1 hour, then heating in a temperature step of 100 DEGC / 1h+170 DEG C / 2h+220 DEG C / 2h for curing, and finally finishing the curing at 300 DEG C / 1h+350 DEG C / 0.5h; and naturally cooling to the room temperature, and carrying out demolding, so as to obtain the PBO fiber composite material. The matrix resin used in the preparation method is converted into high-temperature-resistant benzoxazole resin in a post-curing process, and the benzoxazole resin has very good thermal stability and mechanical property, so that the temperature resistance grade of the composite material is substantially increased, the mechanical property of the composite material is substantially improved, and the PBO fiber composite material can be used for preparing high-temperature-resistant composite materials and composite materials with high strength requirements.

Description

[0001] 【Technical field】 [0002] The invention relates to the preparation of composite materials, specifically, a polyphenylene benzobisoxazole PBO fiber composite material and a preparation method thereof. [0003] 【Background technique】 [0004] Polyphenylene benzobisoxazole (PBO) is a class of benzoxazole-containing aromatic heterocyclic liquid crystal polymers, which have excellent mechanical properties, high temperature resistance and chemical stability, and have broad application prospects in the field of high-performance materials , especially for high-strength fibers. PBO fiber is currently used in fields such as body armor, explosion-proof impact materials and high-strength composite materials for aircraft. [0005] However, unlike other high-performance fibers used in composite materials, the molecular structure of PBO polymer lacks polar groups, resulting in poor wettability, low interfacial bonding force between fiber and resin matrix, easy to generate interface d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/04C08G73/22
CPCC08G73/22C08L79/04C08L2201/08C08L2205/025C08L2205/16
Inventor 刘小云兰方兴张侃庄启昕李欣欣钱军
Owner EAST CHINA UNIV OF SCI & TECH
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