Dynamically vulcanized polylactic acid plastic/rubber thermoplastic elastomer and preparation method thereof

Abstract

The invention discloses a dynamically vulcanized polylactic acid plastic / rubber thermoplastic elastomer and a preparation method thereof. In parts by mass, its raw materials include the following components: 20-90 parts of polylactic acid, 10-80 parts of rubber, 0.1-1 part of antioxidant, 1-10 parts of interface modifier, and 0.1-4.8 parts of crosslinking agent , 0.1-4.2 parts of auxiliary cross-linking agent; during preparation, mix polylactic acid, antioxidant, rubber and interface modifier evenly at a temperature of 150-190 ° C, and add cross-linking agent and auxiliary cross-linking agent under high-speed shearing The crosslinking agent dynamically vulcanizes the rubber phase to obtain a polylactic acid plastic / rubber thermoplastic elastomer prepared by dynamic vulcanization. The polylactic acid plastic / rubber thermoplastic elastomer obtained in the present invention has high mechanical strength, excellent impact performance, repeatable processing and other characteristics, and can be widely used in medical treatment, automobile industry, agricultural production, packaging, clothing, information electronics industry, chemical industry , new energy and environmental protection.

Description

technical field [0001] The invention relates to a thermoplastic elastomer material, in particular to a dynamically vulcanized polylactic acid plastic / rubber thermoplastic elastomer and a preparation method thereof. Background technique [0002] The invention of petroleum-based plastics in the 20th century is known as the greatest invention. Petroleum-based plastic products greatly facilitate people's daily life, but the waste after use of these products is difficult to biodegrade, causing serious white pollution to the earth; At the same time, oil is a non-renewable resource, and over-exploitation and use have made oil resources nearly exhausted. Today, energy issues and environmental issues are getting more and more attention from people. Searching for renewable, biodegradable and environmentally friendly polymer materials that can replace petroleum-based plastics has aroused great interest among material scientists from all over the world. [0003] Polylactic acid (PLA) ...

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Problems solved by technology

[0002] The invention of petroleum-based plastics in the 20th century is known as the greatest invention. Petroleum-based plastic products greatly facilitate people's daily life, but the waste after use of these products is difficult to biodegrade, causing serious white pollution to the earth; At the same time, oil is a non-renewable resource, and over-exploitation and use have caused oil resources to be exhausted

But this patent has the following problems: 1. The amount of peroxide is unreasonable. In terms of mass percentage, peroxide accounts for the lowest mass percentage of rubber phase is 3.3%, and the highest is nearly 20%. From Example 1 to Example 4, the peroxidation The percentages of the compound in the rubber mass are 4%, 5%, 4%, and 3.3%, respectively. Excessive peroxides will cause the degradation of polylactic acid and ultimately affect the performance of the product; 2. The vulcanization system is too simple, and the peroxide diiso Propylbenzene is a vulcanizing agent, and vulcanized products will have peculiar smell, which will affect the application of the product

Chinese invention patent application CN101864156A adopts methylolacrylamide and acrylate copolymer to toughen and modify polylactic acid. The elongation at break and impact strength of polylactic acid are improved, but the preparation process of methylolacrylamide and acrylate copolymer is complicated. Disadvantages such as poor reproducibility

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