Biodegradable mulching film

Abstract

The invention discloses a biodegradable mulching film. The biodegradable mulching film comprises the following components:30-50 parts of polyethylene, 13-20 parts of starch, 13-20 parts of brown algae, 1-2 parts of a moisturizing agent, 3-5 parts of nutritional components, and 5-9 parts of a crosslinking agent, wherein the mass ratio of starch to brown algae is 1:1; the starch is one or the mixture of cassava starch and maize starch; the brown algae comprises gulfweed, undaria pinnatifida, giant kelp, ecklonia kurome okam, scytosiphon lomentaria, hyperborean algae and other large-scale kelps;the moisturizing agent is super absorbent resin and specifically a starch grafting acrylate polymerizing crosslinking substance or an acrylamide-acrylate copolymerizing crosslinking substance or the mixture thereof; the crosslinking agent is the mixture of formaldehyde and sodium polyphosphate based on the ratio of 1:(1-2); the nutritional components are trace element fertilizers. The biodegradable mulching film can be completely degraded by soil microorganisms, and meanwhile, fertilizer is supplied to plants, so that the biodegradable mulching film has a good application prospect. The biodegradable mulching film is environmentally friendly, can be completely degraded in the soil within 7-12 months, and is capable of remediating soil.

Description

technical field [0001] The invention relates to a biodegradable plastic film, which belongs to the technical field of agricultural film. Background technique [0002] Since 1979, plastic film mulching cultivation technology has been vigorously promoted in my country. Agricultural plastic film has become an important means of production in modern agricultural production. It has the functions of improving soil properties, increasing soil temperature, maintaining soil moisture and nutrient supply, and reducing pests and diseases. Most of the traditional mulch films are made of artificially synthesized plastics, which cannot be automatically degraded in the natural environment. Long-term use leads to the accumulation of broken films in the soil layer year by year, resulting in soil compaction, poor air permeability, poor water and fertilizer flow, and poor root development, which affects crop absorption. Water nutrients, seeds sown on plastic film fragments can not germinate, et...

AI Technical Summary

Problems solved by technology

Most of the traditional mulch films are made of artificially synthesized plastics, which cannot be automatically degraded in the natural environment. Long-term use leads to the accumulation of broken films in the soil layer year by year, resulting in soil compaction, poor air permeability, poor water and fertilizer flow, and poor root development, which affects crop absorption. Water nutrients, seeds sown on plastic film fragments can not germinate, etc., resulting in what we call "white pollution"

Most of the used mulch is broken and remains in the soil, so it is difficult to clean up. It is not feasible to reduce white pollution by recycling the used mulch