Greenhouse film and preparation method thereof

Abstract

The invention discloses a greenhouse film which comprises an outer layer, a middle layer and an inner layer. The greenhouse film is prepared from the following raw materials in parts by weight: the outer layer: 100 parts of low density polyethylene, 40-60 parts of linear low density polyethylene, 15-25 parts of an ethylene-vinyl acetate copolymer / light screener mixture, 0.2-0.4 part of talc powder, 2-5 parts of superfine shell powder and 0.1-0.5 part of an ultraviolet quencher; the middle layer: 100 parts of low density polyethylene, 15-30 parts of linear low density polyethylene, 10-15 parts of the ethylene-vinyl acetate copolymer / light screener mixture, 0.2-0.4 part of talc powder, 6-10 parts of superfine shell powder and 0.01-0.1 part of the ultraviolet quencher; and the inner layer: 100 parts of low density polyethylene, 15-30 parts of linear low density polyethylene, 15-25 parts of the ethylene-vinyl acetate copolymer / light screener mixture, 0.2-0.4 part of talc powder, 2-5 parts of superfine shell powder, 0.01-0.2 part of the ultraviolet quencher, and 0.8-2.5 parts of a hindered amine free radical capture agent. The greenhouse film is prepared from the outer layer, the middle layer and the inner layer though a three-layer co-extruding process and has the advantages of being good in toughness and good in ultraviolet endurance capacity.

Description

technical field [0001] The invention relates to an agricultural film, in particular to a greenhouse film and a preparation method thereof. Background technique [0002] In the vast temperate zone with four distinct seasons, people widely use greenhouses to cultivate vegetables, melons, fruits, crops, etc. Shed film refers to the plastic agricultural film used to make plastic greenhouses and greenhouses. Covering can provide crops with a microclimate environment with good temperature, humidity and light quality, and can prevent pests and diseases and reduce the impact of natural disasters, thereby improving crop yield and quality, harvesting earlier and extending the growth cycle. The heat source of the solar greenhouse comes from solar radiation, not only the light energy and heat during the day, but also the heat at night mainly depends on the solar radiation accumulated during the day. As the transparent covering material of the daylighting roof, the different types and ...

AI Technical Summary

Problems solved by technology

The shed film is exposed to sunlight for a long time, and the ultraviolet rays in the sun are likely to cause polymer degradation, which makes the shed film aging and brittle, especially under high or low temperature conditions. The embrittlement speed is faster and the service life of the shed film is shortened.

Typhoons are prone to occur in the south, and the embrittled film is difficult to withstand the blowing of the typhoon, so the film is easily broken

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