Controllable fully biodegradable mulching film and preparation method thereof

Abstract

The invention belongs to the technical fields of biodegradable material modification and application, and relates to a controllable fully biodegradable mulching film and a preparation method thereof.The controllable fully biodegradable mulching film comprises the following raw materials in parts by weight: 1-50 parts of high-crystallinity polylactic acid, 10-90 parts of polybutylene adipate / butylene terephthalate, 0-50 parts of poly propylene carbonate, 0.1-2 parts of a plasticizer, 0.1-2 parts of a chain extender, 0.1-1 part of a lubricant, 0.1-1 part of a dispersant, 0.1-1 part of an opening agent, 1-3 parts of a compatibilizer, 0.1-8 parts of a gas barrier, 0-1 part of an antioxidant, 0-1 part of a light stabilizer, 0.1-2 parts of an anti-hydrolysis agent and 0-3 parts of an antibacterial agent. The raw materials are pretreated and uniformly mixed, the controllable fully biodegradable mulching film is obtained by extrusion and blow molding, and the thickness of the mulching film is0.005 to 0.020 mm. The fully biodegradable mulching film provided by the invention has good mechanical properties, excellent heat preservation and moisture retention performance, and can be completely degraded by itself; the mulching film degradation rate can be regulated according to the 'mulching film function period' of different crop mulching films in different regions to meet the needs of different crops in different regions.

Description

technical field [0001] The invention belongs to the technical field of modification and application of biodegradable materials, and in particular relates to a controllable fully biodegradable plastic film and a preparation method thereof. Background technique [0002] Due to its function of heat preservation and moisture conservation, the transparent PE plastic mulch covering the crops can increase production and income, but because it is not degradable, it also brings flooding "white pollution". [0003] Due to the widespread use of ultra-thin plastic film and the lack of residual film recovery technology and mechanism, the recovery rate of plastic film in my country is less than 2 / 3. A large amount of plastic film left in the soil destroys the soil structure, hinders the movement of water and nutrients in the soil, and affects crop growth and development. As the amount of mulch left in the soil climbs, the mulch that would have boosted crop yields is starting to lead to lo...

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Problems solved by technology

[0002] Due to its function of heat preservation and moisture conservation, the transparent PE plastic mulch covering the crops can increase production and income, but because it is not degradable, it also brings flooding "white pollution"

[0003] Due to the widespread use of ultra-thin plastic film and the lack of residual film recovery technology and mechanism, the recovery rate of plastic film in my country is less than 2 / 3, and a large amount of plastic film left in the soil destroys the soil structure, hinders the movement of water and nutrients in the soil, and affects crop growth and development

[0009] The degradation process of fully biodegradable mulch is greatly affected by light, temperature, moisture and soil environment. A specific biodegradable mulch can only meet the requirements of a certain crop in one area, but in another area, due to different environments and crop growth. Depending on the environmental requirements, this biodegradable mulch may not be suitable for

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