High-strength and anti-warping polyolefin composite material and preparation method thereof

Abstract

The invention relates to a high-strength and anti-warping polyolefin composite material. The polyolefin composite material is prepared from components in parts by weight as follows: 50-90 parts of polyolefin resin, 0.4-1 part of a heat stabilizer, 0.2-1 part of an ultraviolet stabilizer, 2-6 parts of nucleating agent master batch, 0.5-5 parts of high-molecular-weight silicone master batch, 10-50 parts of flat glass fiber and 1-6 parts of a compatilizer. The compatilizer is selected from maleic anhydride grafted polypropylene or maleic anhydride grafted methacrylate containing organosilicone; the maleic anhydride grafting rate is 0.8%-1.2%. In the high-molecular-weight silicone master batch, the molecular weight of an organosiloxane ultrahigh molecular weight polymer is larger than or equalto 1 million and the silicone content is 40%-60%. The length of the flat glass fiber is 2-5 mm, and the cross section of the flat glass fiber is a rectangular structure 20-32 mu m long and 4-10 mu mwide. The polyolefin composite material has excellent resin mechanical performance, so that a product has high mechanical performance and anti-warping performance.

Description

technical field [0001] The invention relates to the technical field of polymer material modification, in particular to a high-strength warpage-resistant polyolefin composite material and a preparation method thereof. Background technique [0002] Commonly used polyolefin synthetic resins include polyethylene, polypropylene, ethylene vinyl acetate copolymer, ethylene methyl acrylate copolymer, ethylene ethyl acrylate copolymer, ethylene butyl acrylate copolymer, polystyrene, styrene ethylene butylene ethylene copolymer, styrene butadiene copolymer, maleic anhydride grafted ethylene, maleic anhydride grafted polypropylene, maleic anhydride grafted ethylene vinyl acetate, silane grafted polyethylene, silane grafted polypropylene, silane grafted Branched ethylene vinyl acetate, etc. Among them, polypropylene is a non-toxic, odorless, tasteless milky white high-crystalline general-purpose synthetic resin polymer with a density of only 0.9-0.91 g / cubic centimeter, which is current...

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Problems solved by technology

[0008] However, although the addition of glass fiber can significantly reduce the molding shrinkage of polypropylene, the glass fiber is prone to uneven orientation in the matrix, resulting in anisotropy of the part, which causes changes in the size of the part and shrinkage in the flow direction of the melt. There is a large difference between the shrinkage rate and the vertical shrinkage rate, which will cause warping and deformation of the parts and affect the assembly

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