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Preparation of polyimide glass fiber composite material

A polyimide glass fiber composite material and glass fiber technology, which is applied in the field of polyimide glass fiber composite material preparation, can solve the problems of poor bonding of glass fiber

Active Publication Date: 2009-01-28
SHANGHAI PLASTICS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] [PETI] type composite material is a polyimide carbon fiber composite material. Here, the matrix resin is more suitable for bonding carbon fibers, but the bonding for glass fibers is poor, and needs to be improved.

Method used

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  • Preparation of polyimide glass fiber composite material
  • Preparation of polyimide glass fiber composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 220g (1.1mol) of 4,4'-ODA and 2300ml DMAc to a three-necked 4-liter flask equipped with mechanical stirring, nitrogen inlet-thermometer and vent tube, and stir to dissolve with nitrogen gas, then add 93g (0.3mol) a-ODPA With 206g (0.7mol) BPDA, react at room temperature for 10 hours to obtain a polyamic acid solution, then add 49.6g (0.2mol) PEPA to react for 14 hours, and obtain a polymerization degree of n+m=10, n / m=3 / 7 imide oligomers. Then add 34g KH550 and 341g 60mm chopped glass fiber, after kneading and impregnation, heat treatment at 100°C, 160°C, 200°C, and 250°C for 5 hours respectively to obtain a pre-pressed polyimide glass fiber composite material with a volatile content of 0.5% by weight material. The performance of the spline obtained after hot molding is: unnotched impact strength 210.8KJ / m 2 , Flexural strength 1012.4MPa, flexural modulus 38.3GPa, tensile strength 508.0MPa, elongation at break 0.79%.

Embodiment 2

[0025] Except adding 4,4'-ODA222g (1.11mol), 62g (0.2mol) a-ODPA and 235g (0.8mol) BPDA, obtain polyamic acid solution at room temperature reaction 14 hours, then add 55g (0.22mol) PEPA reaction 10 hours, an imide oligomer with a degree of polymerization of n+m=4 and n / m=1 / 4 was obtained. Then add 25g KH550 and 252g 60mm chopped glass fiber, after kneading and impregnation, heat treatment at 100°C, 160°C, 200°C, 250°C for 3 hours respectively to obtain a polyimide glass fiber composite material with a volatile content of 1% by weight. Except the material, other operation steps and formula are exactly the same as embodiment 1, and the result spline performance is: unnotched impact strength 168KJ / m 2 , Flexural strength 596MPa, flexural modulus 28.5GPa, tensile strength 322MPa, elongation at break 0.83%.

Embodiment 3

[0027] In addition to adding 4,4'-ODA120g (0.6mol), 155g (0.5mol) a-ODPA and 149g (0.5mol) BPDA, reacted at room temperature for 6 hours to obtain a polyamic acid solution, then added 49.6g (0.2mol) PEPA to react After 6 hours, an imide oligomer with a degree of polymerization of n+m=2 and n / m=1 was obtained. Then add 49g KH550 and 480g 60mm chopped glass fiber, after kneading and impregnation, heat treatment at 100°C, 160°C, 200°C, 250°C for 2 hours respectively to obtain a polyimide glass fiber composite material with a volatile content of 2% by weight. Outside the material, other operation steps and formula are exactly the same as embodiment 1, and the result spline performance is: unnotched impact strength 106KJ / m 2 , Flexural strength 454MPa, flexural modulus 22.0GPa, tensile strength 259MPa, elongation at break 0.86%.

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Abstract

The invention relates to a preparation method of polyimide glass fibre composite material, which adopts 2, 3, 3', 4'-oxalation diphenyl pyromellitic dianhydride, 3, 3', 4, 4'-diphenyl pyromellitic dianhydride and 4, 4'-diaminodiphenyl ether copolymerization to prepare polyamic acid, and adopts 4-phenylacetylene phthalic anhydride to carry out end capping reaction to prepared imide oligomer and then be kneaded with a silane coupling agent and chopped glass fiber, the polyimide glass fibre composite material prepressing material is prepared after heat treatment, the performances of transect prepared by hot moulding technology are that: non-notch impact strength is 210.8KJ / m<2>, bending strength is 1012.4MPa, flexural modulus is 38.3GPa, tensile-strength is 508.0MPa and fracture elongation is 0.79 percent.

Description

1. Technical field [0001] The present invention relates to a kind of preparation method of polyimide glass fiber composite material, more precisely, the present invention relates to the kneading and processing of 4-phenylacetylene phthalic anhydride-terminated imide oligomer and glass fiber to prepare polyimide Fiberglass Composite Methods 2. Background technology [0002] Aromatic polyimide is the polymer with the highest heat resistance. Due to its excellent mechanical properties and electrical properties, it is used as a raw material in a wide range of fields. With the rapid development of the aerospace industry, polyimide composite materials used as structural components of civil aircraft, reconnaissance aircraft and artificial satellites will bring good development opportunities. However, aromatic polyimide generally has poor processability, and is especially unsuitable as a matrix resin for melt molding and fiber-reinforced composite materials. In order to improve t...

Claims

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Application Information

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IPC IPC(8): C08J5/04C08L79/08C08K5/544C08K7/14C08G73/10
Inventor 张珩包来燕邱孜学
Owner SHANGHAI PLASTICS RES INST CO LTD
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