A kind of non-alkali glass fiber sizing for LFT reinforced polypropylene with high impregnability and its application

Abstract

A high-impregnation non-alkali glass fiber sizing agent for LFT reinforced polypropylene and its application, the sizing agent includes a pH regulator, a silane coupling agent, a film-forming agent A, a film-forming agent B, a lubricant, a surface Active agent, antioxidant and deionized water, film-forming agent A is polypropylene wax emulsion modified by maleic anhydride grafting, film-forming agent B is polyethylene emulsion modified by maleic anhydride grafting, lubricant is PEG The combination of lubricants and mineral oil lubricants, the surfactant is a combination of microcrystalline wax emulsion and cationic polyacrylamide emulsion, and the antioxidant is hypophosphite. The present invention also provides the application of the sizing agent in the production of alkali-free glass fibers for LFT-reinforced polypropylene. The glass fibers produced by the sizing agent have good interfacial bonding properties and can be rapidly compatible with polypropylene resin at high temperatures. The impregnation speed is fast, and it also has good manufacturability, good wear resistance, less hairiness, and high impregnation properties, which can improve production efficiency and reduce production costs.

Description

[0001] (1) Technical field [0002] The invention relates to a sizing agent, in particular to the development and application of a novel glass fiber sizing agent for long-fiber reinforced polypropylene with high impregnation properties. [0003] (2) Background technology [0004] With the continuous deepening of the concept of environmental protection, the proportion of thermoplastic materials in composite materials is increasing day by day, especially the new reinforcement materials based on long fiber reinforced thermoplastic resin, the development speed is particularly rapid, and the application fields are becoming more and more extensive. , cheap, corrosion-resistant, easy to recycle and reuse, and excellent mechanical properties, etc., are widely used in the automotive industry, aerospace industry, building materials industry, etc. Compared with ordinary fiber-reinforced thermoplastic materials, long-fiber-reinforced thermoplastics (LFT) have a longer fiber retention lengt...

AI Technical Summary

Problems solved by technology

[0005] The processing technology of LFT reinforced materials needs to pass continuous glass fiber through the mold, fuse with polypropylene resin, complete impregnation at high temperature, and then cut into pellets for later injection molding and compression molding, among which LFT pellets The impregnation effect not only affects the mechanical properties of the final product, but also has an important impact on the manufacturability and smoothness of subsequent production. Therefore, the development of high-impregnation LFT reinforced polypropylene yarn has certain market potential, but due to glass The fiber itself has been surface-treated and has a certain degree of banding. When it is combined with the resin, it needs to add a lot of tension, and it is difficult to achieve full impregnation in a very short time. At present, many manufacturers in the market cannot complete the impregnation. The impregnation effect is ensured without sacrificing production speed, which leads to low efficiency in actual production and puts forward high requirements on the process performance of the product

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