Fully-degradable mulching film capable of applying fertilizer, and preparation method for fully-degradable mulching film

Abstract

The invention discloses a fully-degradable mulching film capable of applying fertilizer. The fully-degradable mulching film capable of applying the fertilizer is characterized by comprising the following components in percentage by mass: 30 to 60 percent of poly(butylene adipate-co-terephthalate) (PBAT), 10 to 30 percent of polylactic acid, 10 to 30 percent of starch, 5 to 10 percent of plasticizer, 0 to 2 percent of chain extender, 5 to 20 percent of chemical fertilizer microcapsule, 5 to 10 percent of filler and 0 to 5 percent of fully-degradable color master batch. The space region is covered by the fully-degradable mulching film to ensure that the temperature and the humidity meet the requirement, polyvinyl alcohol on the surfaces of the fertilizer microcapsules is dissolved to ensure that the surfaces of the fertilizer microcapsules have porous sustained-release structures, and the fertilizer is slowly separated out under the humid conditions for drop irrigation of crops, so that the function of applying the fertilizer to the crops is exerted. After the crops are harvested completely, the fully-degradable mulching film is not needed to be recovered.

Description

technical field [0001] The invention relates to a fully degradable top dressing mulch film and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] Plastic film is one of the important means of production in agricultural production. It can not only improve ground temperature, water retention, soil conservation, fertilizer conservation and fertilizer efficiency, but also weed control, pest control, drought and waterlogging resistance, salt suppression and seedling protection, and improvement of near-ground light. Thermal conditions, make the product hygienic and clean, and many other functions. [0003] As a large agricultural country, my country has a vast territory and great differences in climate. Therefore, the application and development of plastic film in the past three decades has been very rapid. It is the country with the largest consumption of plastic film, the largest coverage area, and the widest variet...

AI Technical Summary

Problems solved by technology

[0004] While plastic film mulching technology has brought huge benefits to my country's agricultural production increase, it has also brought serious pollution to the soil, and there is a potential danger of white pollution.

Since most of the mulch films currently used are polyethylene or polyvinyl chloride mulch films, the stability of this type of mulch film is extremely high, and the fragments left in the soil cannot be degraded by soil microorganisms, nor can they be absorbed and utilized by crops.

A large number of plastic film residues have brought serious negative impacts on the ecological environment of farmland and agricultural production, causing a series of problems such as soil structure damage, arable land quality decline, crop production reduction, agricultural operation obstruction, and secondary environmental pollution.

In addition, the crops covered with plastic film need to manually pierce the plastic film to drip-irrigate the crops during the growth period, which consumes a lot of manpower and material resources, and also increases the number of broken films, which makes it difficult to recover the plastic film later.

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