Polylactic acid/core-shell structure composite material and preparation method thereof

Abstract

The invention belongs to the technical field of composite materials, and relates to a polylactic acid / core-shell structure composite material and a preparation method thereof. The polylactic acid / core-shell structure composite material is prepared from the following components in percentage by weight: 5-90% of polylactic acid, 5-80% of biodegradable polyester, 5-45% of inorganic filler, 0-5% of a processing agent, 0-40% of a flame retardant, 0-10% of an antistatic agent and 0-5% of a modifier. According to the invention, the biodegradable polyester is used to replace the traditional toughening compound system, so that the polylactic acid / core-shell structure composite material has the characteristics of high strength, high toughness, low cost, full biodegradation and the like.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a polylactic acid / core-shell structure composite material and a preparation method thereof. Background technique [0002] Polylactic acid is a thermoplastic aliphatic polyester that is artificially synthesized from crops such as corn and can eventually decompose into carbon dioxide and water in the environment. It does not rely on petroleum, and the entire production and processing process is more environmentally friendly and will not cause environmental pollution. Problems can be realized in the true sense of "originating from nature and returning to nature". Polylactic acid also has good biocompatibility and is one of the most promising biodegradable polymer materials. However, PLA is severely brittle, and its products have poor flexibility and low tear strength. These defects greatly limit its development and application. [0003] At present, the cost of polylactic...

AI Technical Summary

Problems solved by technology

For simple rubber or elastomer or polyester toughened polymers, although the impact toughness has been greatly improved, it is usually necessary to add 10~20 (wt)% rubber or elastomer or polyester, which often leads to the deterioration of the material. Too much loss of strength and modulus, polymers toughened by organic rigid particles, the toughness of the material does not increase much, and the toughening effect needs to be achieved under certain conditions

Although inorganic rigid particles can also achieve a strengthening effect while toughening the polymer matrix, this method also has some disadvantages: (1) Due to the characteristics of the inorganic filler itself, the low-temperature impact performance of the toughening system is still not ideal, It cannot meet the use requirements of some occasions, and the increase in toughness is limited; (2) The weather resistance is poor, because the inorganic particles usually need to be surface-treated with organic small molecule coupling agents before blending to facilitate the dispersion of fillers, while During long-term use, these small molecule additives often migrate, which will adversely affect the mechanical properties and service life of the material; (3) It is not easy to disperse, and it is impossible to obtain a composite material with uniform dispersion of inorganic particles, especially for nano Small-sized inorganic filler-filled polymer systems, due to the high surface energy of the particles, can easily aggregate and create defects in the material

Due to the above defects, the theory of inorganic rigid particle toughening has made little progress, and there has been no huge breakthrough in practical applications.

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