Full-biodegradable mulching film for peanut planting

Abstract

A full-biodegradable mulching film for peanut planting comprises a heat-resistant layer, a barrier layer and a hydrolysis-resistant layer, wherein the heat-resistant layer is prepared from the following raw material components: 70-90 parts of PBAT, 0-20 parts of PBS, 0-5 parts of PLA, 0-20 parts of an inorganic filler, 0.1-2 parts of a chain extender, 0.3-4 parts of a light stabilizer, 0.1-0.5 part of an antioxidant and 0.1-0.5 part of a slipping agent; the barrier layer is prepared from the following raw material components: 40-70 parts of PBAT, 0-30 parts of modified PPC, 3-10 parts of PLA, 5-30 parts of the inorganic filler, 0.3-2 parts of the chain extender, 0.2-3 parts of the light stabilizer, 0.1-0.5 part of the antioxidant, 0.1-2 parts of an anti-blocking agent and 0.2-3 parts of the slipping agent; and the hydrolysis-resistant layer is prepared from the following raw material components: 75-94 parts of PBAT, 0-10 parts of PLA, 0-5 parts of the inorganic filler, 0.5-3 parts of the chain extender, 0.1-0.8 part of the light stabilizer, 0.1-0.5 part of the antioxidant and 0.2-3 parts of a hydrolysis-resistant agent. The full-biodegradable mulching film is prepared by a three-layer co-extrusion method, so that the defect that the requirements of all layers cannot be simultaneously met in a single-layer film blowing production process is overcome.

Description

technical field [0001] The invention belongs to the field of degradable plastic films, in particular to a fully biodegradable plastic film for peanut planting. Background technique [0002] Due to the use of agricultural mulch film, the temperature and humidity of the soil are effectively controlled, the loss of water and nutrients is reduced, and the high and stable yield of crops is promoted, thereby increasing the benefits of agricultural production. But at the same time, due to the one-time use of the mulch film, a large amount of residual mulch film remains in the soil every year, and these residual mulch films are difficult to degrade in nature, forming a barrier layer in the soil, making the water, air, The flow of fertilizers is blocked, resulting in compaction of the soil structure, which seriously endangers the ecological environment and causes white pollution. Therefore, solving the problem of residual plastic film polluted soil has become an urgent task in plast...

AI Technical Summary

Problems solved by technology

However, most of the existing biodegradable mulch films use PLA and PBAT as the main raw materials. Although PLA and PBAT have good biodegradability, their barrier and weather resistance are poor, and the water vapor transmission rate of PBAT is as high as 1080g / m 2 24h, increasing the thickness of the film can improve its barrier performance, but the cost is too high

At the same time, the light at noon in summer is strong, and the strong light at high temperature will accelerate the aging of the degradation film and the evaporation of water, and the moisture retention will decrease significantly, which will lead to the occurrence of yield reduction in the process of peanut planting.

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