Biodegradable heat-resistant sheet and preparation method thereof

Abstract

The invention provides a biodegradable heat-resistant sheet and a preparation method thereof. The biodegradable heat-resistant sheet is prepared from, by weight, 20-50% of polylactic acid, 35-55% of PBS, 0-10% of polyester, 1-25% of nucleation enhancer, 0.5-5% of an auxiliary and 0-0.5% of an anti-UV agent. The biodegradable heat-resistant sheet and the preparation method solve the problems that existing polylactic acid sheets are high in brittleness, not resistant to heat, high in sheet rolling cost, narrow in application range and the like. The biodegradable sheet is low in cost, can be efficiently produced, has good physical and mechanical properties, machinability and heat resistance, and can be widely applied to the fields such as electronic products, cosmetics and disposable heat-resistance articles. The application range of biodegradable products is widened.

Description

technical field [0001] The invention relates to a biodegradable heat-resistant sheet and a preparation method thereof. Background technique [0002] Polymer materials have been used for decades, which has brought great changes to people's lives. We cannot live without polymer materials and their products, but polymer materials and their wastes take hundreds of years to decompose. The convenience brought by human beings has also brought serious "white pollution", which has become one of the key issues of global concern. The research and development of biodegradable polymers has received the attention of governments and people of various countries, and is regarded as the strategic direction of new materials in the future, and it is also the best way to solve white pollution. However, in the past few years, due to technical bottlenecks and limitations in application fields, biodegradable materials were mainly used in the fields of starch-based, film packaging, and low-temperat...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent (publication number CN101831086A) proposes a starch-based and PVA modified sheet for tableware, etc., but the starch and the glycerin used are easy to absorb moisture, which is not conducive to preservation, and the safety and service life are too short;

[0005] Chinese patent (publication number CN102352093A) proposes a method for preparing a double-sided matting biodegradable sheet, which has obvious progress in processing, product appearance and performance, but the blending of polylactic acid, PBAT, and calcium carbonate cannot solve the problem of heat resistance. Problem, the product is still only suitable for low temperature environment;

[0006] The Chinese patent (publication number CN102744850A) proposes a method for a two-color biodegradable sheet, but only solves the color processing problem, and does not propose a solution to the heat resistance and other appearance problems of the sheet product;

[0007] Chinese patent (publication number CN101157793A) proposes a method for preparing heat-resistant polylactic acid products, but this method is realized by means of banburying, hot-pressing molding and isothermal crystallization, and heat-resistant sheets cannot be prepared on ordinary sheet forming machines , the process is complicated, and the scope of applicable products is very narrow;

[0008] Chinese patent (publication number CN1931907A) proposes a polylactic acid sheet preparation method, but uses a starch system, which has fatal defects in heat resistance and hydrolysis aging;

[0009] Chinese patent (publication number CN101362853A) has proposed a kind of preparation method of low-cost recyclable polylactic acid sheet material, and this method provides the molding processing method of good polylactic acid substrate sheet material, but the brittleness of polylactic acid sheet material and not The problem of heat resistance has not been solved, and the application range is limited;

[0010] Chinese patent (publication number CN102977566A) proposes a blended sheet of PHA / PBS, which has made significant breakthroughs in calendering process and heat resistance, but PHA has problems such as high cost, high odor, and difficulty in industrialization. Difficult to commercialize in terms of cost and application;

[0011] Japanese patent (publication number 98122839.9) proposes a preparation method of PBS / PLA / filler blend modification, but it is mainly used in zipper and fastener products, and polylactic acid as a dispersed phase cannot meet the strength requirements of sheet products;

[0012] The Chinese patent (publication number CN102020773A) proposes to prepare PLA-PBS copolymers by copolymerization, but oligomers are used, the copolymers have low melting points and poor heat resistance, and cannot bring about substantial product performance improvements;

[0013] The Chinese patent (publication number CN102153846A) proposes the preparation of PHA / PETG composite sheets by calendering, which solves the problems of heat resistance and processing, but the cost is too high and cannot be used in applications such as blister;

[0014] Chinese patent (publication number CN103540111A) discloses a preparation method of a high-strength and high-temperature-resistant polylactic acid sheet, but this method shows that the strength and heat resistance are far from the disclosed values, relying on Claimed toughening modification and filler blends are not capable of doubling strength and heat resistance

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