Preparation method of biodegradable plastic film

Abstract

A preparation method of a biodegradable mulching film is characterized in that: 1, according to the weight proportion, materials are prepared by taking the following components: 55-60 parts of polyethylene, 17-20 parts of cassava starch, 18-22 parts of corn starch, and 5-10 parts of a multielement biological degradation promoting agent; the polyethylene comprises the components by weight: 68-90 parts of 7050, and 10-32 parts of 1F7B; the multielement biological degradation promoting agent comprises the components by weight: 40-80 parts of a cross-linking agent, and 20-40 parts of a degradation accelerant; the cross-linking agent is an arbitrary combination of one or two of di(tert-butylperoxy isopropyl)benzene, sodium hexametaphosphate, sodium trimetaphosphate or sodium tripolyphosphate; the degradation accelerant is an arbitrary combination of one or two of a corn oil, a sunflower seed oil, an epoxidized soybean oil or manganese stearate; and 2, the preparation method comprises the following production steps: a, blending to obtain a degradation masterbatch; b, granulating the degradation masterbatch; c, carrying out blow molding to prepare a film; d, trepanning the biodegradable mulching film; and e, rolling up the biodegradable mulching film, carrying out seal package, and warehousing.

Description

technical field [0001] The invention relates to a preparation method of a mulch film, in particular to a preparation method of a biodegradable mulch film, belonging to the technical field of biological materials. Background technique [0002] Plastic mulch is widely used in crop cultivation, which can improve soil properties, increase soil temperature, maintain soil moisture and nutrient supply, improve light conditions, and reduce pests and diseases. Most of the traditional mulch films are made of synthetic plastics, which cannot be automatically degraded after use, and accumulate in the soil for a long time, resulting in "white pollution", which will affect and destroy the physical and chemical properties of the soil, block the collusion of plant roots, and affect the normal absorption of water by plant roots and nutrients, resulting in reduced crop yields. Therefore, farmers need to recycle the used plastic film. However, the residual plastic film after use has been left...

AI Technical Summary

Problems solved by technology

However, the existing degradable mulch film preparation process is complicated, the production cost is high, the product is greatly affected by the environment and region, and there are problems such as uncontrollable degradation time, too long degradation time, incomplete degradation, poor mechanical properties and water resistance, etc.

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