Toughened plastics and its preparation method

摘要

A toughened plastic and its preparation method, with the toughened plastic being obtained by rubber-plastic blending of brittle or less brittle plastics and a rubber mixture. The rubber mixture consists of powdery rubbers having a cross-linked structure and an average particle size of not more than 0.50 μm, and at least one selected from the group consisting of unvulcanized rubbers and thermoplastic elastomers. The morphology and the particle size distribution of the rubber phase contained in the toughened plastic can be controlled by changing the particle size of the powdery rubbers having a cross-linking structure and choosing proper unvulcanized rubbers or thermoplastic elastomers. The toughened plastic has good toughness and processability while keeping better strength and stiffness.

主权项

1. A toughened plastic comprising:
a brittle plastic or a less brittle plastic; and a rubber mixture, wherein said brittle plastic has a chain entanglement density (Ve) of less than 0.15 mmol/ml and a chain characteristic ratio (C∞) of larger than 7.5, wherein said less brittle plastic is at least one selected from the group consisting of: polyvinyl chloride, polypropylene and polyformaldehyde, wherein said rubber mixture consists of a powdery rubber and at least one selected from the group consisting of: an unvulcanized rubber and a thermoplastic elastomer, wherein said powdery rubber has a cross-linked structure, a homogeneous structure, a gel content of 60% by weight or more, and an average particle size in a range of 0.02 μm to 0.50 μm, wherein a weight ratio of said rubber mixture to said brittle plastic or said less brittle plastic is from 1:99 to 30:70 and a proportion of said powdery rubber being from about 50% to 95% by weight, based on a total weight of said rubber mixture, wherein said powdery rubber is a fully vulcanized powdery rubber which is at least one selected from the group consisting of: fully vulcanized powdery natural rubber, fully vulcanized powdery styrene-butadiene rubber, fully vulcanized powdery carboxylated styrene-butadiene rubber, fully vulcanized powdery acrylonitrile-butadiene rubber, fully vulcanized powdery carboxylated acrylonitrile-butadiene rubber, fully vulcanized powdery polybutadiene rubber, fully vulcanized powdery chloroprene rubber, fully vulcanized powdery silicone rubber and fully vulcanized powdery acrylic rubber, and wherein said brittle plastic or said less brittle plastic is melt blended together with said rubber mixture.