Semi-impregnated prepreg preparation method and prepreg structure

Abstract

The invention relates to the technical field of formed composite materials, in particular to a semi-impregnated prepreg preparation method and a prepreg structure. The semi-impregnated prepreg preparation method comprises the following steps that low gram weight gluing is carried out on a first glue film; high-gram-weight gluing is carried out on a second glue film; the first glue film and the second glue film which are coated with glue are attached to the two side faces of a fiber layer, and hot press molding is conducted; and an air guide layer is attached to the hot-pressed first glue film. By improving the prepreg hot-pressing process in the prior art, the gluing parameters are controlled when the first glue film and the second glue film are glued, a structure with an upper micro-infiltration layer, a middle dry yarn layer and a bottom infiltration layer is formed, and the micro-infiltration layer has air permeability; and compared with the prior art, the ventilation continuity of a semi-impregnated prepreg base material is reserved, gas residues in the vacuum-pumping curing process of a thick and heavy product laying layer are reduced, the stability of dry yarns in the semi-impregnated prepreg base material is ensured, and the phenomena of twisting, slippage and dispersion of the dry yarns in the laying process are reduced.

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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