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Aramid fiber/polyimide composite material and preparation method thereof

A polyimide and aramid fiber technology, used in fiber processing, textile and papermaking, physical processing, etc., can solve the problem of poor surface wettability of polyimide matrix, lack of chemically active groups, and high crystallinity of aramid fibers. problems, to achieve the effects of excellent transverse tensile properties, improved surface activity, and improved interfacial compatibility

Inactive Publication Date: 2015-05-20
HEILONGJIANG XINDA ENTERPRISE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, aramid fiber has high crystallinity and high orientation, resulting in smooth surface, lack of chemically active groups, and poor surface wettability with polyimide matrix.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The aramid fiber and pyromellitic anhydride are mixed and placed in self-made microwave equipment for grafting reaction. The microwave radiation frequency is 0.5GHz, and the radiation dose is 0.1mW / cm 2 , the radiation time is 1s. Using dimethylformamide and dimethyl sulfoxide as the reaction solvent, the reaction temperature is 50°C, and the aramid fiber is grafted with pyromellitic anhydride and ethylenediamine for precondensation reaction to form aramid fiber / polyimide prepolymer. The aramid fiber / polyimide composite material was prepared by melt-blending the prepolymer and polyimide through a twin-screw extruder.

Embodiment 2

[0015] The aramid fiber and pyromellitic anhydride are mixed and placed in a self-made microwave equipment for grafting reaction. The microwave radiation frequency is 2.5GHz, and the radiation dose is 1mW / cm 2 , The radiation time is 120s. Using dimethylformamide and dimethyl sulfoxide as the reaction solvent, the reaction temperature is 60°C, and the aramid fiber is grafted with pyromellitic anhydride and ethylenediamine for precondensation reaction to form aramid fiber / polyimide prepolymer. The aramid fiber / polyimide composite material was prepared by melt-blending the prepolymer and polyimide through a twin-screw extruder.

Embodiment 3

[0017] The aramid fiber and pyromellitic anhydride are mixed and placed in a self-made microwave equipment for grafting reaction. The microwave radiation frequency is 5GHz, and the radiation dose is 2mW / cm 2 , the radiation time is 240s. Using dimethylformamide and dimethyl sulfoxide as the reaction solvent, the reaction temperature is 70°C, and the aramid fiber is grafted with pyromellitic anhydride and ethylenediamine for precondensation reaction to form aramid fiber / polyimide prepolymer. The aramid fiber / polyimide composite material was prepared by melt-blending the prepolymer and polyimide through a twin-screw extruder.

[0018] The performance of each example is shown in Table 1, and the reference example is the performance of the chemically modified aramid fiber reinforced polyimide composite material.

[0019] Table 1:

[0020] performance Embodiment one Embodiment two Embodiment Three Reference ratio Charpy unnotched impact strength (KJ / m 2 )...

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PUM

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Abstract

The invention discloses an aramid fiber / polyimide composite material and a preparation method thereof. The method comprises the following steps: uniformly mixing aramid fiber with pyromellitic dianhydride, placing the obtained mixture in a self-made microwave device, carrying out a grafting reaction, and radiating under a microwave radiation frequency of 0.5-5GHz and a radiation dose of 0.1-2mW / cm<2> for 1-240s; carrying out a pre-polycondensation reaction on aramid fiber grafted pyromellitic dianhydride and ethene diamine at 50-70DEG C to generate a aramid fiber / polyimide prepolymer; and carrying out melt blending on the prepolymer and polyimide through a double screw extruder to prepare the aramid fiber / polyimide composite material. The composite material has excellent transverse tensile strength, and can be used in the aviation and aerospace field.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to an aramid fiber / polyimide composite material and a preparation method thereof. Background technique [0002] Polyimide has the advantages of high rigidity, high melting point, and good heat resistance, and can be used for a long time above 300°C. Its modified materials are mostly used in aerospace, military equipment, and electronics industries. [0003] The full name of aramid fiber is aromatic polyamide fiber, which has the advantages of high specific strength, high specific modulus, low density, high temperature resistance, high toughness and high wear resistance. However, aramid fiber has high crystallinity and high orientation, resulting in smooth surface, lack of chemically active groups, and poor surface wettability with polyimide matrix. [0004] Microwave radiation grafting modification is a new type of modification technology in recent years. This technology has the ad...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08L77/00D06M10/10
CPCC08L79/08C08L77/10D06M10/10
Inventor 穆兴文宫克难宋阳
Owner HEILONGJIANG XINDA ENTERPRISE GRP
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