High-dipping-property alkali-free glass fiber impregnating agent for LFT reinforced polypropylene as well as application thereof

Abstract

The invention relates to a high-dipping-property alkali-free glass fiber impregnating agent for LFT reinforced polypropylene as well as the application thereof. The impregnating agent comprises a pH value regulator, a silane coupling agent, a film-forming agent A, a film-forming agent B, a lubricating agent, a surfactant, an antioxidant and deionized water, wherein the film-forming agent A is a maleic anhydride grafted and modified polypropylene wax emulsion; the film-forming agent B is a maleic anhydride grafted and modified polyethylene emulsion; the lubricating agent is the combination of aPEG lubricating agent and a mineral oil lubricating agent; the surfactant is the combination of microcrystalline wax emulsion and cationic polyacrylamide emulsion; and the antixodiant hypophosphite is hypophosphite. The invention also provides the application of the impregnating agent to production of alkali-free glass fiber for the LFT reinforced polypropylene. The glass fiber produced by the impregnating agent has a high interface bonding property, can be rapidly fused with polypropylene resin at high temperature, is high in dipping speed, has good processing property, high wear resistanceand little filoplume, and has a high dipping property, so that the production efficiency can be improved and the production cost can be reduced.

Description

(1) Technical field [0001] 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. (2) Background technology [0002] 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 length. The current ...

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Problems solved by technology

[0003] 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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