Low temperature resistant polypropylene material and preparation method thereof

Abstract

The invention creatively provides a low temperature resistant polypropylene material and a preparation method thereof. The low temperature resistant polypropylene material comprises, by mass, 54-88% of polypropylene, 10-20% of elastomer, 0-10% of polyethylene and 0.4-1% of an assistant. The low temperature resistant polypropylene material has good low temperature toughness and rigidity in low temperature environment, has obviously better brittle temperature than other like products in the market, and can reach an expected effect without increasing the production cost.

Description

technical field [0001] The invention relates to a polypropylene material, in particular to a low-temperature resistant polypropylene material and a preparation method thereof. Background technique [0002] Polypropylene material has been widely used in the automotive industry because of its light weight, solvent resistance, easy processing and easy recycling, especially as the main material for the preparation of automotive interior and exterior trims. However, the brittleness / toughness transition temperature of existing polypropylene materials is generally high, and the surface of the material is brittle in a low temperature environment, which greatly limits the scope of application of the material in practice. [0003] In order to improve the low-temperature toughness of polypropylene, the usual method is to increase the toughness of the material by adding elastomers. For example, EP0794222-A1 discloses a thermoplastic resin composition comprising polypropylene, styrene-c...

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Problems solved by technology

For example, EP0794222-A1 discloses a thermoplastic resin composition comprising polypropylene, styrene-containing elastomer and talcum powder, in which an acceptable balance of toughness and rigidity is reported; CN101550252A discloses a composition composed of polypropylene, polyethylene, A polypropylene composition with good low-temperature performance and good appearance composed of ethylene-based copolymer rubber, polypropylene nucleating agent, talcum powder and antioxidant, although the patent discloses that polyethylene and ethylene-based copolymer rubber are jointly toughened effect, but its low-temperature performance index is not clear; the polypropylene material modified by the above scheme has a beam notched impact strength of 1.5-2.5KJ / m2 in a low-temperature environment (-30°C), and the small-molecule additive The content is high, and it will cause pollution to the environment inside the car when used as a car interior

[0004] The low-temperature toughness of the modified polypropylene material disclosed in the prior art is not good, and the low-temperature toughness and good rigidity cannot be perfectly combined, and the expected effect cannot be achieved, especially the Charpy notched impact strength or the Izod notched impact strength. The test results under low temperature conditions cannot meet the requirements of automotive safety performance

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