Structure-enhanced SMC (Sheet Moulding Compound) glass fibre impregnating agent and application thereof in production of twistless roving

Abstract

The invention discloses a structure-enhanced SMC (Sheet Moulding Compound) glass fibre impregnating agent and application thereof in production of twistless roving. The impregnating agent is preparedfrom the following components: a coupling agent, a film forming agent, a lubricating agent, a pH value regulator and water, wherein the coupling agent is a silane coupling agent; the film forming agent is a mixture of non-cross-linked bisphenol A type polyester emulsion, cross-linked unsaturated polyester emulsion and medium-and-high molecular weight bisphenol A type epoxy emulsion. The inventionprovides the application of the impregnating agent in the production of twistless glass fibre roving for a structure-enhanced SMC sheet. The twistless glass fibre roving produced by using the impregnating agent has the advantages of low hairiness, high impregnation speed, high choppability, high production smoothness and high compatibility with enhanced resin, can greatly improve the mechanical strength of a glass fibre enhanced composite material product, and is suitable for an SMC moulding process.

Description

(1) Technical field [0001] The invention relates to a glass fiber sizing agent and its application in the production of untwisted rovings, in particular to a glass fiber sizing agent and its application in the production of untwisted glass fiber rovings for reinforced structural SMC sheets. (2) Background technology [0002] Sheet molding compound (SMC) is a thin sheet molding compound obtained by impregnating chopped fibers or mats with unsaturated polyester resin and thickening. It can be divided into structural type and A-level surface type. The structural type is Emphasize the strength of the product; A-level surface is to emphasize the surface effect of the product, specifically refers to the appearance of the product to achieve the same effect and level as spray paint. At present, it has been widely used in transportation, construction, instrumentation and other industrial fields. The most commonly used matrix resin for SMC is unsaturated polyester resin. In the SMC ...

AI Technical Summary

Problems solved by technology

In the SMC molding process, the degree of crosslinking of the glass fiber sizing agent is very important and is an important factor affecting the molding of the SMC. If the degree of crosslinking is too small, the glass fiber will dissolve prematurely and become a monofilament, and the resin penetration speed Slow, the glass fiber cannot be effectively dispersed in the resin, and the glass fiber content is uneven, which reduces the strength and surface properties of the SMC product; if the crosslinking degree is too high, it will affect the compatibility between the glass fiber and the matrix resin, and affect the quality of the product. strength

The film-forming agen