Composite material, preparation method and application thereof

Abstract

Relating to the field of composite materials, the invention discloses a composite material, a preparation method and application thereof. The preparation method of the composite material includes: gluing a fiber layer to at least one side surface of a thermoplastic sheet or metal sheet through an adhesive to form a preform, then employing two-component polyurethane resin for resin transfer moldingon the fiber layer surface of the perform so as to form a polyurethane-fiber layer together with the fiber layer. Specifically, the two-component polyurethane resin contains a polyol component and apolyisocyanate component. The preparation method for the composite material provided by the invention not only can ensure no springback of fiber cloth, but also can acquire good surface quality, and the obtained product has very high transparency, scratch resistance and interlayer bonding strength.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a preparation method of a composite material, a composite material prepared by the method and an application of the composite material as a decorative part. Background technique [0002] Fiber composite molding methods mainly include prepreg compression molding and resin transfer molding (RTM). Wherein, the prepreg compression molding refers to putting the fiber material pre-impregnated with the resin matrix into a mold, and then performing molding to make the molding material gradually solidify, and then taking the product out of the mold. The resin transfer molding refers to laying the fiber material in the mold, then injecting the resin matrix into the mold with pressure, the resin matrix is ​​soaked into the fiber material, and then curing and demolding. [0003] For example, CN102785627A discloses a method similar to prepreg compression molding to prepare fiber composite ...

AI Technical Summary

Problems solved by technology

[0004] However, the prepreg compression molding usually requires carbon fiber epoxy resin prepreg or thermoplastic resin prepreg compression molding. The surface quality of the finished product formed by the solidification of the material is poor, and subsequent grinding and spraying are required many times to obtain a product with a better appearance

The prepreg compression molding can often only form products with relatively simple structures

In addition, liquid resin transfer molding, which is widely used in the automotive and aerospace industries, generally requires complex pre-molding steps, and usually the fiber cloth is placed directly in the mold and injected with liquid resin for resin transfer molding, which will The fiber cloth is easily washed away by the fast-injected resin, which seriously affects the product quality; and because the liquid resin used is mostly epoxy resin, in order to speed up the molding speed, it often requires a higher mold temperature, greater energy consumption, and poorer surface quality. and poor scratch resistance

In addition, none of the above methods can guarantee the bonding force between the subsequent in-mold injection molding of carbon fiber composite materials and plastics.

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