A kind of prepreg and preparation method thereof

Abstract

The invention proposes a prepreg and a preparation method thereof, which are prepared by a resin matrix and fibers using a hot-melt process. The prepreg is composed of upper and lower impregnated layers and a partially impregnated layer in the middle, and the partially impregnated layer in the middle is composed of discontinuous The non-infiltrating fiber area and the infiltrating fiber area are composed, and the degree of infiltration of the prepreg is 70-90%. The prepregs of the present invention are fully infiltrated at the top and bottom and partially infiltrated in the middle, and the dry fibers are left inside the prepreg, which can ensure the same covering performance of the prepreg and the conventional prepreg, and there is no need to distinguish the prepreg when laying layers The surface condition of the material is good, the paving process is good, and the construction is convenient.

Description

technical field [0001] The invention relates to a prepreg and a preparation method thereof, in particular to a prepreg suitable for an OOA (non-autoclave) process and a preparation method thereof, and belongs to the technical field of prepreg 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 manufactu...

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.

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