Long glass fiber enhanced polypropylene composite material and preparation method thereof

Abstract

The invention relates to the technical field of polypropylene materials, and specifically relates to a long glass fiber enhanced polypropylene composite material and a preparation method thereof. Thelong glass fiber enhanced polypropylene composite material comprises a component A and a component B. The component A is prepared from following components in parts by weight: 30 to 90 parts of polypropylene resin, 10 to 60 parts of alkali-free continuous glass fibers, 0.5 to 2.0 parts of a lubricant, 0.01 to 0.1 part of peroxides, 0.5 to 3.0 parts of a silane coupling agent, and 0.2 to 0.7 part of an antioxidant. The component B is prepared from following components in parts by weight: 30 to 90 parts of polypropylene resin, 10 to 60 parts of alkali-free continuous glass fibers, 0.5 to 2.0 parts of a lubricant, 1.0 to 4.0 parts of a catalyst, 0.01 to 0.1 part of peroxides, and 0.2 to 0.7 part of an antioxidant. Peroxides decompose and functionalize polypropylene; during the infiltration process, polypropylene has high fluidity and excellent infiltration effect; after the material is moulded, the mechanical strength of the material is improved, and moreover, the prepared material has few fibers on the surface, is easy to mould, and has a high performance.

Description

technical field [0001] The invention relates to the technical field of polypropylene materials, in particular to a long glass fiber reinforced polypropylene composite material and a preparation method thereof. Background technique [0002] Polypropylene resin (PP) is a general-purpose plastic with a wide range of uses, and long glass fibers are generally used to improve the mechanical properties of polymer materials. The performance of polypropylene resin modified by long glass fibers is greatly improved, even It can reach the level of engineering plastics. In practical applications, plastics can replace steel and reinforced engineering plastics to meet the requirements of light weapon packaging boxes, automotive fields, and home appliances. However, when the existing long glass fiber material is used to reinforce polypropylene, it is prone to floating fiber phenomenon, which cannot meet the needs of the parts. When the material is made, it is easy to separate from the polyp...

AI Technical Summary

Problems solved by technology

However, its choice has the following defects for the industry: 1. The melting index of high-melting finger materials is unstable, resulting in poor process stability in the production process and inconsistent product quality; 2. The price of high-performance high-melting finger materials is relatively low. High, the competitiveness of the product is low; 3. The method of increasing the fluidity of the material by increasing peroxide, on the one hand, the fluidity is unstable, on the other hand, the performance of the product is greatly lost, and the product competitiveness is also lost; 4. High Lower molecular weight of flowable polypropylene leads to lower mechanical properties of the polymer substrate

The melt index of high-flow polypropylene substrates on the market is generally 60-120g / 10min, which still cannot fully guarantee the effective infiltration of polypropylene in glass fibers, resulting in low interface strength, many floating fibers, and low impact resistance. If the ultra-high flow polypropylene is used or the polypropylene substrate is degraded by peroxide to improve fluidity and increase its flow and infiltration between glass fibers, the average molecular weight of polypropylene will decrease and the mechanical properties will decrease.

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