Fully-environmentally-degradable film material and preparation method thereof

Abstract

The invention relates to a fully-environmentally-degradable film material and a preparation method thereof. The fully-environmentally-degradable film material adopts a double-film structure and comprises a first film and a second film, wherein the degradation time of the first film is longer than that of the second film; the first film is prepared from raw material components as follows: a degradation agent, a heat stabilizer, a light stabilizer, an antioxidant, low-density polyethylene and linear low-density polyethylene; the second film is prepared from raw material components as follows: a degradation agent, low-density polyethylene and linear low-density polyethylene. The provided fully-environmentally-degradable film material adopts the double-layer structure, the defect that degradation speeds of all parts of conventional plastic films in the application process is overcome, and the practicability of the degradable plastic film is remarkably improved. Meanwhile, the provided plastic film can greatly reduce winding of plastic film residues to machinery, influence of the plastic film residues on crops of the next season is reduced, the human cost is saved, and development of productivity in the aspect of agriculture is further remarkably promoted.

Description

technical field [0001] The invention relates to the technical field of plastic film, in particular to an environmentally fully degradable film material and a preparation method thereof. Background technique [0002] In recent years, plastic mulch has been widely used as a means of modern agricultural technology to increase crop production and farmers' income, and it plays a pivotal role in promoting the development of agricultural production; however, the non-degradability of plastic mulch not only brings severe The "white pollution" problem, and it makes soil compaction, poor permeability and soil fertility drop. For this reason, in the past 20 years, extensive research has been carried out at home and abroad, trying to find an environmentally friendly degradable mulch film that can replace plastic mulch films, mainly including: starch-added degradable agricultural mulch film, photodegradable agricultural mulch film, and plant fiber mulch film. . In the currently develope...

AI Technical Summary

Problems solved by technology

Since the main raw materials used in these two types of mulches are still plastics and chemical fibers, neither of them can completely eliminate the problem of "white pollution" in farmland.

[0003] In addition, among the currently commercially available mulch films, single-layer mulch films are the main ones, and the degradation speeds 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 a long time, causing serious negative effects such as soil structure damage and arable land quality decline. In addition, the existence of a large number of residual film The agricultural operation is hindered, which will adversely affect the cultivation of the next season's crops and seriously hinder the development of agricultural productivity.

[0004] In recent years, although people have conducted extensive research on degradable mulch, the above problems have not been effectively resolved

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