Full-biodegradable plastic film and preparation method thereof

Abstract

The invention discloses a full-biodegradable plastic film, which takes poly ethylene carbonate polyurethane as the base. The material is composed of the following components in parts by weight: 20-90 parts of poly ethylene carbonate polyurethane, 1-50 parts of thermoplastic starch, 5-10 parts of compatible modified component, 3-5 parts of nanometer inorganic reinforced component, 2-20 parts of compound plastification component and 10-30 parts of lubrication component. The full-biodegradable plastic film prepared by the method of the invention has favourable biodegradable performance and can be completely biodegradated within 180 days under the condition of compost; the film has favourable toughness, higher anti-tearing strength and wide using temperature range, can satisfy the performance requirements of various plastic products in the market, in particular to the plastic products, such as disposable packages, tableware, plastic shopping bags and the like which have severe white pollution, so that the film is the full-biodegradable material with wide market prospect.

Description

technical field [0001] The invention belongs to the technical field of fully biodegradable plastic film and its preparation, and in particular relates to a fully biodegradable plastic film mainly composed of polyethylene carbonate polyurethane and a preparation method thereof. Background technique [0002] In the late 1980s, plastic shopping bags, garbage bags, agricultural films, etc. began to be widely used in China, and a "white revolution" emerged. However, due to the lack of a complete garbage classification and recycling system in China, these plastic bags were discarded. After use, it causes serious white pollution, which accumulates in the farmland after use, affecting the growth of plants and mechanical farming operations. The plastic film flying in the wind not only affects the landscape, but also causes livestock to eat by mistake and cause death. The "White Revolution" turned into "White Pollution". In order to solve these problems, researchers at home and abroa...

AI Technical Summary

Problems solved by technology

However, due to the low glass transition temperature of polylactic acid and its brittleness at room temperature, the product has poor toughness and low tear strength, and the use temperature of the product is also greatly restricted.

CN200810051415.6 discloses a fully biodegradable plastic film based on polypropylene carbonate and its preparation method. Polypropylene carbonate has high flexibility and tear resistance, but its glass transition temperature is lower than that of polylactic acid , only 35-40 ° C, the prepared fully biodegradable plastic film can only be used in low temperature places

CN1709969A discloses a kind of polydioxanone as a matrix of fully biodegradable plastic film and its preparation method, however, due to the high production cost of polydioxanone, the scale application of this plastic film is limited

[0004] Polyethylene carbonate is a kind of fully biodegradable material with excellent biodegradability and biocompatibility, and can degrade rapidly in natural environment (Nishidah, Tokiway.Chem.Lett., 1994 (3): 421-422, Fang Xinggao, Chemical World, 1993 (8): 365-368), yet, this material, like polypropylene carbonate, has a low glass transition temperature, and the application range of fully biodegradable plastic films prepared directly from it is limited

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