Non-PMR type polyimide carbon fiber prepreg, composite material and preparation method thereof

A polyimide carbon fiber and polyimide technology, applied in the field of polymer materials, can solve the problems of polyimide carbon fiber prepreg short storage period, complex molding process, environmental pollution, etc., and achieve low preparation cost, The effect of low porosity and excellent mechanical properties of the product

Pending Publication Date: 2021-04-23
长春长光宇航复合材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a non-PMR type polyimide carbon fiber for solving the technical problems such as short storage period and difficult storage of polyimide carbon fiber prepreg in the prior art, as well as its complex molding process and environmental pollution. Prepregs, composite materials and methods for their preparation

Method used

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  • Non-PMR type polyimide carbon fiber prepreg, composite material and preparation method thereof
  • Non-PMR type polyimide carbon fiber prepreg, composite material and preparation method thereof
  • Non-PMR type polyimide carbon fiber prepreg, composite material and preparation method thereof

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preparation example Construction

[0044] The preparation method of non-PMR type polyimide carbon fiber prepreg of the present invention, step is as follows:

[0045] Step 1. Prepare polyimide prepreg

[0046] Stir and mix polyimide and solvent at 120-160°C until uniform, then cool to 50-80°C to obtain polyimide prepreg;

[0047] Step 2. Preparation of polyimide carbon fiber composite material

[0048] Use the polyimide prepreg obtained in step 1 to prepare a single-layer adhesive film, introduce unidirectional carbon fiber or carbon fiber cloth into the middle of the two-layer single-layer adhesive film, heat to 160-200°C and keep the temperature constant for 10-16h, cool to room temperature, Obtain polyimide carbon fiber prepreg;

[0049] Alternatively, evenly coat the polyimide prepreg obtained in step 1 on the surface of the carbon fiber fabric, heat to 160-200° C., and cool to room temperature to obtain a polyimide carbon fiber prepreg.

[0050] In the above technical scheme, in step 1, the polyimide is...

Embodiment 1

[0076] Step 1. Add dimethylacetamide to a reaction vessel with a heating and stirring device at a mass ratio of polyimide to dimethylacetamide of 60:40, raise the temperature to 150°C, and stir fully to The two form a uniform solution. After the mixing is completed, cool to 70°C at a rate of 3°C / min to obtain a polyimide prepreg;

[0077] The structural formula of above-mentioned polyimide is as follows:

[0078]

[0079] Wherein, A is the following structure, or one of the isomers of the following structure:

[0080]

[0081] B is the following structure, or one of the isomers of the following structure:

[0082]

[0083] C is the following structure, or one of the isomers of the following structure:

[0084]

[0085] Step 2. Brush the polyimide prepreg obtained in step 1 evenly on the surface of high-strength carbon fiber cloth (strength 2GPa, modulus 250GPa), put it in an oven, heat to 170°C and keep the temperature constant for 12h, after removing the solvent...

Embodiment 2

[0087] Spray methylene chloride on the surface of the polyimide carbon fiber prepreg prepared in Example 1 to soften it, then increase the temperature according to the gradient of 250°C / 2h+300°C / 4h+350°C / 4h, and control the clamping pressure to 2.5MPa. Molding (process conditions such as figure 1 Shown), obtain polyimide carbon fiber composite material.

[0088] Adopt dynamic thermomechanical analyzer (DMA) to detect the polyimide carbon fiber composite material that embodiment 2 prepares, and detection result is as follows figure 2 shown, from figure 2 It can be seen that the storage modulus (E') of the polyimide carbon fiber composite material begins to decay at 330°C, and the Tan delta curve shows that the glass transition temperature of the material is as high as 379.3°C, which shows that the polyimide carbon fiber composite material Has good heat resistance.

[0089] The polyimide carbon fiber composite material prepared in Example 2 was tested by a universal testing...

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Abstract

The invention relates to a non-PMR type polyimide carbon fiber prepreg, a composite material and a preparation method thereof, which belong to the technical field of high polymer materials. The technical problems that in the prior art, polyimide prepregs are short in storage period and difficult to store, the forming process of the prepregs is complex, and the environment is polluted are solved. The preparation method of the prepreg comprises the following steps of uniformly mixing polyimide with a solvent to prepare a polyimide prepreg adhesive, preparing a single-layer adhesive film from the polyimide prepreg adhesive, introducing unidirectional carbon fibers or carbon fiber cloth between the two single-layer adhesive films, or uniformly coating the polyimide prepreg adhesive on the surface of a carbon fiber fabric to obtain the polyimide carbon fiber prepreg. The prepreg does not contain micromolecular polymerization monomers, can be stored at room temperature and is long in storage period; solvent molecules are not contained, the curing process is simple in process, and the product porosity is low; and the composite material formed by the material has excellent mechanical properties and good heat resistance.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a non-PMR type polyimide carbon fiber prepreg, a composite material and a preparation method thereof. Background technique [0002] Polyimide refers to a class of heat-resistant polymer materials containing imide rings on the main chain. Thermosetting polyimide refers to a polyimide with a body-shaped network structure, which uses an imide oligomer with a low molecular weight and an active end group to be formed first, and then cross-linked and cured through the active group, so that Form a spatial network structure. [0003] Thermosetting polyimide resin plays an important role in the field of advanced composite materials due to its extremely high heat resistance grade, excellent mechanical properties and dielectric properties. Composites based on thermosetting polyimide resin are concentrated in the application of The cold-end parts of aerospace high-per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08K7/06C08J5/24
CPCC08J5/24C08J2379/08C08K7/06
Inventor 商伟辉卜凡哲林再文邹志伟姜昊
Owner 长春长光宇航复合材料有限公司
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