Degradable mulch film for anti-drip irrigation belt burn

Abstract

The invention discloses a degradable film for preventing a drip irrigation belt from being burnt. The degradable film is prepared from, by weight, 25-50% of polylactic acid, 25-50% of polycaprolactone, 15-25% of polyethylene glycol, 5-10% of talcum powder and 0.1-2% of a plasticizer. The polylactic acid is selected as a raw material, is used as a biodegradable material, has the biodegradability, can be degraded into water and carbon dioxide finally and completely eradicates damage caused by non-degradable polyethylene film to the environment. Due to introduction of polyethylene glycol, the glass transition temperature of the polylactic acid is effectively decreased, the processing performance is improved, brittle factures are overcome, the toughness is improved, and the degradation speed is increased; meanwhile, the material hydrophobicity is effectively improved, the surface of the film has the hydrophily, water drops on the film and water drops formed by steam under the film can be flatly laid on the film and slide down along the surface of the film, the phenomenon that a convex mirror is formed by water drops on the film and water drops under the film is eradicated, and then the effect of preventing the drip irrigation belt from being burnt is achieved.

Description

technical field [0001] The invention relates to the technical field of soil irrigation, in particular to a degradable mulch film for preventing drip irrigation belt burns. Background technique [0002] Under-mulch drip irrigation technology, as a deepening of film-mulching cultivation technology, is a new type of irrigation technology that combines the advantages of film-mulching technology and drip irrigation technology. According to the current usage of farmers, most of the commonly used mulch materials are hydrophobic materials, which prevent the small water droplets on the upper and lower surfaces of the mulch from sliding freely, and form a convex lens under sunlight. When the dot happens to fall on the drip irrigation tape under the film, a local high temperature will be formed, which will burn and melt the surface of the drip irrigation tape, affecting its normal use. On the other hand, most of the common agricultural mulches used today are made of non-degradable pol...

AI Technical Summary

Problems solved by technology

Among them, polyethylene film modified mulch is mainly realized by adding biodegradable masterbatch to the main material of polyethylene film, and its main raw material is still non-degradable polyethylene material, which has not fundamentally achieved complete degradability; starch The strength, stretchability, and light transmittance of the additive degradable mulch film are poor, and the degradation time is difficult to control. There are problems of degradation and incomplete degradation before the film breakage period is reached; the paper mulch film or hemp mulch film has low strength. , Poor wind and rain resistance, easy to break, not suitable for mechanical film laying

Therefore, the existing degradable plastic film products generally have defects and are difficult to be widely accepted by farmers.

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