SMC composite material and preparation method thereof

Abstract

The invention provides an SMC composite material which comprises the following components in parts by mass: 350 parts of mixed resin, 432 parts of a mixed additive, 650 parts of mixed filler, 8 parts of a thickener, 5 parts of a curing agent and 360 parts of a reinforcing material, wherein the mixed resin is a mixture calculated according to the following parts by mass: 200 parts of unsaturated polyester resin, 90 parts of modified methyl methacrylate and 50 parts of polystyrene; the mixed additive is a mixture which is prepared from the following components in parts by mass: 6.5 parts of a solvent-free wetting dispersant, 10 parts of a wetting dispersant, 15 parts of a release agent, 0.5 part of p-benzoquinone and 400 parts of an ultraviolet light absorber; the mixed filler is a mixture which is prepared from the following components in parts by mass: 400 parts of aluminum hydroxide and 250 parts of calcium carbonate. The SMC sheet prepared by the method can be directly sprayed with paint or bonded and compounded without polishing when being used for producing molded products, sprayed with paint or bonded and compounded with other products. Through optimized combination of the fiber length, the strength of the molded product is improved, and through optimized combination of aluminum hydroxide and calcium carbonate, the flame retardant effect of the SMC sheet is guaranteed.

Description

technical field [0001] The invention relates to the technical field of SMC composite materials, in particular to an SMC composite material and a preparation method thereof. Background technique [0002] The traditional SMC sheet is a kind of pressed sheet formed by mixing unsaturated polyester resin, thickener, initiator, filler, etc. into a resin paste impregnated with chopped fiber roving or glass fiber, and wrapped with film on both sides. mold material. [0003] The traditional SMC sheet can meet the requirements of light weight and low shrinkage, high production efficiency, suitable for mass production, high material utilization rate, good closed mold molding operation environment; simple molding process, saving manpower; can realize large-scale device products forming. [0004] However, the existing SMC sheets also have many defects, such as poor bending strength and impact strength, poor flame retardant effect, high adhesion level, and need to polish the product. I...

AI Technical Summary

Problems solved by technology

[0004] However, the existing SMC sheet also has many defects, such as poor bending strength and impact strength, poor flame retardant effect; high adhesion level, and the product needs to be polished

It is difficult for the existing SMC sheet to take into account the surface brightness and color diversity of the molded product, and the material fluidity of the existing SMC sheet is poor during the molding process

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