A kind of degradable film and preparation method thereof

Abstract

The invention provides a degradable mulching film. The mulching film is prepared from the following raw materials in percentage by mass: 10-40 percent of composite bio-based modified plant extract, 20-60 percent of starch, 10-30 percent of polyvinyl alcohol, 1-5 percent of polyester, 5-25 percent of plasticizer, less than or equal to 0.4 percent of a reinforcing agent, less than or equal to 0.5 percent of a wet strength agent and less than or equal to 0.1 percent of a defoaming agent. A preparation method of the degradable mulching film comprises the following steps: preparing a composite bio-based modified plant extract; uniformly mixing the raw materials and granulating; and performing blow molding to form the film. According to the mulching film, pollution on soil caused by application of the mulching film can be effectively relieved, crop growth can be facilitated, a positive effect is played on agricultural production, the bio-degradation rate of a residual film which is used for four months can be over 85 percent, injurious insects can be repelled, breeding of injurious insects can be inhibited, and hazards and mycosis transmission can be reduced. The degradable mulching film has the characteristics of low cost, low energy consumption and comprehensive functions; the preparation process is simple and low in cost, and can realize effective utilization of raw material resources.

Description

technical field [0001] The invention provides a degradable plastic film, which belongs to the technical field of agricultural implements. Background technique [0002] Agricultural mulch is the ground covering film, usually transparent or black PE film, and also green and silver films, which are used to increase soil temperature, maintain soil moisture, maintain soil structure, prevent pests from invading crops, prevent microorganisms from causing diseases, and promote plant growth. In addition, plastic film mulching also has the effect of preventing rain and drainage in rainy seasons. The application of plastic film mulching in the arid areas of northern my country also has the effect of drought resistance and moisture conservation, which can increase crop yields by about 30% in large areas. [0003] At present, agricultural mulch film is not only used in vegetable cultivation, but also in the production of field crops, fruit trees, forestry, flowers and economic crops; not...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems that agricultural mulch film is extremely difficult to degrade, pollute the environment, and affect crop growth, the present invention provides a degradable mulch film