High-performance EVA multifunctional composite shed plastic film

Abstract

The invention relates to an agricultural shed plastic film and a preparing method of the agricultural shed plastic film, in particular to a high-performance EVA multifunctional composite shed plastic film. The composite shed plastic film is formed by compounding an inner layer film, a middle layer film and an outer layer film. The composite shed plastic film is produced by adopting a master batch method; under the condition that the original device and the original technology and process are unchanged, the inner layer film, the middle layer film and the outer layer film are mixed independently according to the mixture ratio in the formula; at first, a small amount of resin powder material and various additives are uniformly mixed, various functional master batches are manufactured through a screw extruder; the functional master batches are aggregates; and then the functional master batches are uniformly mixed with residual resin powder material again; and finally, the composite shed plastic film is formed by extruding the inner layer film, the middle layer film and the outer layer film according to the thicknesses of 1:1:1 through a three-layer co-extrusion blow-moulding machine set. As the resin raw material in the shed plastic film mainly adopts high VA content EVA resin, compared with other functional shed plastic films, the shed plastic film is higher in transparency, remarkably improved in light transmittance, heat insulating ability and low temperature resistance, long in dripping and fog dissipation lasting period, and remarkably prolonged in service life.

Description

technical field [0001] The invention relates to an agricultural shed film and a preparation method thereof, in particular to an EVA multifunctional composite shed film. Background technique [0002] Plastic shed film has been widely used in agricultural production in my country, and its effect of heat preservation, moisture retention and production increase in farmland has been recognized by the industry and farmers. At present, the base resins of widely used agricultural plastic shed films mainly include PVC, PE, and EVA. Although PVC has high transparency and good cold resistance, it has high density and a small covering area of ​​the same weight film; although PE film has low density, it is relatively transparent. Poor performance and low temperature resistance, and poor thermal insulation and compatibility with additives; while EVA film has both the advantages of the former two without the disadvantages of the two, so it is an ideal production of agricultural shed film. ...

AI Technical Summary

Problems solved by technology

At present, the base resins of widely used agricultural plastic shed films mainly include PVC, PE, and EVA. Although PVC has high transparency and good cold resistance, it has high density and a small covering area of ​​the same weight film; although PE film has low density, it is relatively transparent. Poor performance and low temperature resistance, and poor thermal insulation and compatibility with additives; while EVA film has both the advantages of the former two without the disadvantages of the two, so it is an ideal production of agricultural shed film. Base resin raw material