High-impact-resistance low-temperature-resistant glass-fiber-reinforced polypropylene composite material and preparation method thereof

Abstract

The invention relates to a high-impact-resistance low-temperature-resistant glass-fiber-reinforced polypropylene composite material and a preparation method thereof. The invention is characterized in that the high-impact-resistance low-temperature-resistant glass-fiber-reinforced polypropylene composite material is prepared from the following raw materials in percentage by weight: 50-80% of polypropylene, 2-15% of graft compatilizer, 10-30% of glass fiber chopped felt, 3-10% of elastomer toughener and 0.5-10% of compound crystal nucleator. In order to solve the problem of poor low-temperature toughening effect in the traditional elastomer, nucleators and auxiliary nucleators for different crystal forms are compounded to regulate the crystal structure and content of the base phase and interface phase in the polypropylene composite material, thereby improving the normal-temperature/low-temperature impact property (especially notch impact property at the low temperature of lower than -30 DEG C) of the reinforced polypropylene composite material on the premise of avoiding over reduction of the rigidity of the composite material. The performance testing indicates that the retentivity of the normal-temperature stretching and bending strength of the modified composite material is 90% above, the low-temperature (-40 DEG C) notch strength can be enhanced by 80-120%, and the comprehensive properties are obviously better than those of the conventional elastomer toughened modified material.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a glass fiber reinforced polypropylene composite material with high impact resistance and low temperature resistance and a preparation method thereof. Background technique [0002] Polypropylene is one of the most widely used general-purpose plastics at present. It has relatively balanced comprehensive properties, excellent chemical resistance, good processing fluidity and relatively low price, so it can be used in industrial fields such as automobiles, electrical appliances, and building materials. Used a lot. However, the defects in the structure and performance of polypropylene are also very obvious. Due to the existence and regular distribution of side chain methyl groups in the molecular chain, the polymer molecular chains are easy to stack in a direction, and the material has a strong tendency to crystallize, but the crystallization process is slow and the crystal...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an improved high-impact and low-temperature-resistant glass fiber reinforced polypropylene composite mat

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