Preparation process of one-time fused and regenerated polyethylene agricultural plastic mulching film

Abstract

The invention discloses a preparation process of an agricultural plastic mulching film, particularly relates to a preparation process of a one-time fused and regenerated polyethylene agricultural plastic mulching film, and belongs to the field of agricultural chemistry. The preparation process comprises the following steps of: firstly, pre-treating polyethylene agricultural plastic mulching film waste film materials; roughly crushing and washing by water; finely crushing and washing by water; centrifugally drying; and then, adding an addition agent; and carrying out agitation, drying, feeding and extrusion, fusion, blowing and molding to obtain a film-making product. Compared with the prior art, 100% of adopted raw materials are waste polyethylene film materials and the recycling utilization rate of the waste films is high; granulation is not needed and the film is formed by one-time fusion; the production process is unique and reasonable, has low investment and low cost and is easy to operate; and no 'three wastes' are generated in a production process and a new way for reutilizing the polyethylene agricultural plastic mulching film is provided.

Description

technical field [0001] The invention relates to a preparation process of an agricultural mulch film, in particular to a preparation process of a disposable molten regenerated polyethylene agricultural mulch film, which belongs to the field of agrochemicals. Background technique [0002] Agricultural film is an important means of production in agriculture after seeds, fertilizers, and pesticides. Its application has brought a revolution to my country's agricultural production and has made important contributions to increasing agricultural efficiency and increasing farmers' income. Commonly used films are ordinary polyvinyl chloride film, polyvinyl chloride non-drip film, ordinary polyethylene film, polyethylene non-drip film, polyethylene multi-functional composite film and EVA multi-functional composite film. At present, the thickness of the film produced by the enterprise is too thin (6 microns, 8 microns lower than the national regulation, 24 microns in the United States, ...

AI Technical Summary

Problems solved by technology

The treatment methods of waste plastic film in my country are mainly incineration and landfill, and the recycling of waste plastic film started late, and the technology is not yet perfect. After cleaning and crushing, the first melt granulation is performed, and then the second melt film is recycled. This technology usually uses 90% new polyethylene as raw material, only a small amount of 10% waste can be added, and must be melted twice. to make products

However, after the secondary melting, the molecular structure chain is shortened, the strength and tensile properties are greatly reduced, and the quality indicators of the produced plastic film products are greatly reduced, which cannot meet the requirements for use, and the cost is high, the cost is high, the added value is low, and the profit is low. , the value of recycling is not great, and there are problems that it is not easy to scale and industrialize

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