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A kind of composite material and ooa preparation method thereof

A technology of composite materials and prepregs, which is applied in the direction of coating, etc., can solve the problems of expensive process cost, poor performance, composite material defects, etc., and achieve the effect of low overall manufacturing cost, reduced product weight, and good laying process

Active Publication Date: 2022-03-04
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The characteristics of high specific strength and specific modulus of resin-based composite materials make it widely used in aerospace. With the gradual increase in the amount of composite materials and product size, the traditional autoclave and molding-based molding processes, The shortcomings of high equipment investment, expensive process cost and unfavorable integrated integral molding are becoming increasingly apparent, which cannot meet the needs of low-cost manufacturing and integrated integral molding of high-performance composite materials, hindering the further expansion of the application of composite materials
Liquid molding represented by VARI has great advantages in low-cost manufacturing and integrated overall molding, but the composite products manufactured by it have low fiber volume content and poor performance, which cannot meet the requirements of high-performance composite materials in the aerospace field. need
The traditional double-sided dipping prepreg prepared by the existing hot-melt method is not suitable for the non-autoclave OOA process, and the gas cannot be discharged smoothly during molding, resulting in defects in the composite material, and the porosity is as high as 5% to 20%. Poor mechanical properties
[0003] In order to solve the above problems, there was a partially impregnated prepreg with a single-sided resin film in the early stage. Although it meets the non-autoclave OOA process of high-performance composite materials, it leaves dry fibers on the surface of the prepreg, so The side with dry fibers has poor pavement performance. Special attention should be paid to the position of the dry fiber surface when laying layers, otherwise it is easy to make mistakes and cause the product to be scrapped.

Method used

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  • A kind of composite material and ooa preparation method thereof
  • A kind of composite material and ooa preparation method thereof
  • A kind of composite material and ooa preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Prepreg:

[0062] T700 continuous carbon fiber 65~68wt%

[0063] 3068 resin 32~35wt%

[0064] Prepreg wetting degree 70~75%

[0065] The compounding temperature for prepreg preparation is 65°C, the resin viscosity is 21000mPa.s, and the compounding pressure is adjusted according to the wettability of the prepreg.

[0066] The prepreg prepared in this example adopts the OOA preparation process to obtain the composite material, and the process is as follows:

[0067] 1. Cutting.

[0068] Cut 16 layers of 320*320mm 0° prepreg with an automatic cloth cutting machine.

[0069] 2. Layering.

[0070] Lay the first layer of prepreg on the surface of the mold, then seal it with a vacuum bag, and pre-compact it under vacuum at room temperature for 15 minutes. After that, after laying three layers of prepregs, use vacuum bags to seal them at room temperature and vacuumize and precompact for 15 minutes until all prepregs are laid up and all prepreg fibers are in one direction...

Embodiment 2

[0079] Prepreg:

[0080] T700 continuous carbon fiber 65~68wt%

[0081] 3180 resin 32~35wt%

[0082] Prepreg wetting degree 75-80%

[0083] The compounding temperature for prepreg preparation is 75°C, the resin viscosity is 28000mPa.s, and the compounding pressure is adjusted according to the wettability of the prepreg.

[0084] The prepreg prepared in this example adopts the OOA preparation process to obtain a composite material. The pre-curing temperature of the composite material OOA is 90 ° C, and the post-curing temperature is 180 ° C. Others are the same as in Example 1. The prepared composite material has bending properties, interlayer shear The shear strength and porosity are shown in Table 1.

Embodiment 3

[0086] Prepreg:

[0087] T700 continuous carbon fiber 65~68wt%

[0088] 9306 Shuangma resin 32~35wt%

[0089] Prepreg wetting degree 80~85%

[0090] The compounding temperature for prepreg preparation is 75°C, the resin viscosity is 25000mPa.s, and the compounding pressure is adjusted according to the degree of infiltration of the prepreg.

[0091] The prepreg prepared in this example adopts the OOA preparation process to obtain a composite material. The pre-curing temperature of the composite material OOA is 100 ° C, and the post-curing temperature is 200 ° C. Others are the same as in Example 1. The prepared composite material has bending properties, interlayer shear The shear strength and porosity are shown in Table 1.

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Abstract

The present invention proposes a kind of composite material and its OOA preparation method, which is prepared by OOA process by partially infiltrating prepreg, and the partially infiltrating prepreg is prepared by resin matrix and fiber by hot-melt process, and the prepreg is composed of upper, The lower impregnated layer and the middle partially impregnated layer are composed of discontinuous non-infiltrated fiber regions and infiltrated fiber regions. The present invention uses a prepreg that is completely infiltrated up and down and partly infiltrated in the middle, and leaves the dry fibers inside the prepreg, which can ensure the same laying properties of the prepreg and the conventional prepreg, and there is no need to distinguish the prepreg when laying layers. The surface state of the impregnation material has good paving manufacturability and convenient construction. The composite material prepared by the OOA method has high density and high pass rate.

Description

technical field [0001] The invention relates to a composite material and an OOA preparation method thereof, belonging to the technical field of composite material preparation. Background technique [0002] The characteristics of high specific strength and specific modulus of resin-based composite materials make it widely used in aerospace. With the gradual increase in the amount of composite materials and product size, the traditional autoclave and molding-based molding processes, The shortcomings of high equipment investment, expensive process cost and unfavorable integrated integral molding are becoming increasingly apparent, which cannot meet the needs of low-cost manufacturing and integrated integral molding of high-performance composite materials, hindering the further expansion of composite materials. application. Liquid molding represented by VARI has great advantages in low-cost manufacturing and integrated overall molding, but the composite products manufactured by ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B15/14B29C70/10
CPCB29B15/14B29C70/08
Inventor 欧秋仁唐中华董大为张帅陈哲明
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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