A kind of semi-impregnated prepreg preparation method and prepreg structure

Abstract

The invention relates to the technical field of molding composite materials, in particular to a method for preparing a semi-impregnated prepreg and a prepreg structure. The method comprises the following steps: applying low-gram-weight glue to the first glue film; High grammage glue coating; attach the first glued film and the second glued film on both sides of the fiber layer, and perform hot pressing molding; attach the air-conducting layer to the hot-pressed first glued film. The present invention controls the gluing parameters when gluing the first adhesive film and the second adhesive film by improving the hot pressing process of the prepreg in the prior art, and forms the upper micro-wetting layer and the middle dry yarn layer And the structure of the bottom impregnated layer, and the micro-infiltrated layer has air permeability; compared with the existing technology, it retains the air-permeable continuity of the semi-impregnated prepreg base layer, and reduces the gas residue during the vacuum curing process of the thick product layup , and ensure the stability of the dry yarn in the semi-impregnated prepreg substrate, reducing the twisting, slipping and dispersion of the dry yarn during the laying process.

Description

technical field [0001] The invention relates to the technical field of molding composite materials, in particular to a method for preparing a semi-impregnated prepreg and a structure of the prepreg. Background technique [0002] Resin-based composite materials are more and more widely used in technical fields such as aerospace, high-speed rail, and wind power blades due to their good performance. fiber layer and lower resin layer; in the prior art, when applying this kind of composite material to products with heavy specifications, the process of laying layers, pouring resin glue, and vacuum curing is often used. , gas is prone to be exposed between layers, and during the process of vacuuming and curing, it will cause gas to remain between layers, which in turn leads to internal quality defects of the product; [0003] In related technologies, in order to solve the above problems, such as figure 1 As shown in , a semi-impregnated manufacturing method is adopted, that is, o...

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Problems solved by technology

[0002] Resin-based composite materials are more and more widely used in technical fields such as aerospace, high-speed rail, and wind power blades due to their good performance. fiber layer and lower resin layer; in the prior art, when applying this kind of composite material to products with heavy specifications, the process of laying layers, pouring resin glue, and vacuum curing is often used. , gas is prone to be exposed between layers, and during the process of vacuuming and curing, it will cause gas to remain between layers, which in turn leads to internal quality defects of the product;

[0003] In related technologies, in order to solve the above problems, such as figure 1 As shown in , a semi-impregnated manufacturing method is adopted, that is, only the resin in the lower layer of the fiber is infiltrated, so that the upper layer of fiber is a dry yarn. In this way, the problem of gas residue in the layer between layers is solved; however, the above scheme During the laying process, there will be problems such as slipping, twisting, and dispersion of the dry yarn layer, resulting in poor laying stability;

[0004] In order to solve the problem of poor paving stability, a layer of felt is covered on the above-mentioned dry yarn layer in the related art for the protection of the dry yarn layer. However, new problems have arisen in this scheme. During the process, the newly added felt layer cannot completely solve the problem of dry yarn movement. On the other hand, during the laying process, the felt will also appear uneven, such as wrinkles, etc.

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