Modified polypropylene material for high-performance thin-walled automobile door panel and preparation method thereof

Abstract

The invention belongs to the technical field of plastics modification and particularly relates to a modified polypropylene material for a high-performance thin-wall automobile door panel and a preparation method thereof. The material is prepared from, by mass, 5%-10% of homopolymerized PP, 20%-30% of first copolymerized PP, 15%-25% of second copolymerized PP, 12%-18% of toughening agent, 1%-2% of compatilizer, 0.4%-0.6% of antioxidant, 0.2-0.4% of weather resistance agent, 3%-6% of melting index regulator, 20%-25% of mineral enhancer, 1.5-3% of scratch resistant agent and 1-2% of other assistants. The preparation method of the modified polypropylene material comprises the steps of mixing, extrusion and granulation. The material prepared by adopting the preparation method has high liquidity, rigidity and toughness, can well meet the usage requirements of the thin-wall automobile door panel and is low in cost. Compared with the prior art, a high-liquidity allyl elastomer is used as the melting index regulator, the liquidity of the material is remarkably improved, and the thin-wall door panel forming requirements are met. In addition, high-liquidity polypropylene and a low surface energy polymer are used in a mixed mode, and the tiger skin stripe defects on the surface of the thin-wall door panel can be basically eliminated.

Description

technical field [0001] The invention belongs to the technical field of plastic modified materials, in particular to a modified polypropylene material for high-performance thin-walled automobile door panels and a preparation method thereof. Background technique [0002] In the past ten years, my country's automobile industry has developed rapidly. Since the beginning of the 12th Five-Year Plan, the total annual production and sales of automobiles have exceeded 20 million, surpassing the United States to rank first in the world, and the number of social vehicles has also increased to nearly 140 million, an increase of nearly 5 times in ten years. With the continuous increase of the total annual production and sales of automobiles and social ownership, the gasoline consumed by automobiles nationwide and the pollution caused to the environment are becoming more and more serious. According to research by relevant institutions, about 1 / 4 of the PM2.5 content in the atmosphere com...

AI Technical Summary

Problems solved by technology

The above patents mentioned the preparation of high-performance polypropylene materials for automotive door panels, but none of them mentioned that they were suitable for the preparation of thin-walled automotive door panel materials. The condition of striae

If the fluidity of the material is increased, the toughness and strength of the material will decrease, and it is difficult to balance the three highs of high flow, high rigidity, and high modulus. Therefore, for the low fluidity of materials and thin-walled door panels in the prior art The technical problem of surface tiger skin defects, how to develop a high-performance modified polypropylene material for thin-walled automobile door panels, which can well meet the requirements of thin-walled automobile door panels, has important practical significance

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