Composite fully-degradable material and preparation method thereof

Abstract

The invention relates to a composite fully-degradable material and a preparation method thereof. The composite fully-degradable material has a double-layer film structure and comprises a first layer film and a second layer film, wherein the degradation time of the first layer film is longer than the degradation time of the second layer film, the raw materials of the first layer film comprise a degradation agent, a heat stabilizer, a light stabilizer, an antioxidant, low density polyethylene and linear low density polyethylene, and the raw materials of the second layer film comprise polyadipic acid/butylene terephthalate and polylactic acid. According to the present invention, the composite fully-degradable material uses the double-layer structure, and various layers are prepared from the materials having different degradation characteristics and have different degradation rates, such that various parts can simultaneously achieve the degradation ending points during the actual use process of the prepared mulch film so as to significantly improve the practicality of degradation mulch film, reduce the influence of the residual film on the next crops, save the labor cost, and promote the development of agricultural productivity.

Description

technical field [0001] The invention relates to the technical field of mulch films, in particular to a composite fully degradable material and a preparation method thereof. Background technique [0002] The application of plastic film mulching technology has greatly promoted the improvement of agricultural output and efficiency, and has contributed to the transformation of agricultural production methods and the leap in agricultural productivity. However, with the increase in the coverage area of ​​plastic film, the traditional plastic film cannot be degraded, and it is difficult to recycle, and the problem of residual film pollution is becoming more and more serious. In order to reduce and eliminate white pollution, various degradable plastic films have been developed. However, among the currently available mulch films, single-layer mulch films are the main ones, and the degradation rates of different parts of the mulch film are different. Some mulch films have reached the...

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Problems solved by technology

However, among the currently commercially available mulch films, single-layer mulch films are the main ones, and the degradation rates of different parts of the mulch films are different. Some of the mulch films have reached the end of degradation, and the mulch films become brittle; Any degradation occurs; resulting in a large number of plastic film fragments remaining in the farmland. These plastic film fragments are not easy to be degraded by soil microorganisms, and they remain in the farmland for

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