Polyvinylidene fluoride (PVDF) agricultural plastic colored mulching film and manufacturing method thereof

Abstract

The invention discloses a polyvinylidene fluoride (PVDF) agricultural plastic colored mulching film. The PVDF agricultural plastic colored mulching film contains the following components in percentage by weight: 50%-80% of PVDF resin, 10%-40% of PMMA (polymethylmethacrylate) resin, 0.05%-15% of pigment, 0.1%-3% of light stabilizer, 0-3% of heat stabilizer and 0.05%-3% of dispersant. The manufacturing method of the mulching film comprises the following steps: (1) performing high-speed stirring on components after pre-drying treatment at the temperature of 80 DEG C-100 DEG C for 30min, and then cooling to 45 DEG C to obtain a special dry blend; (2) performing extrusion and granulation on the obtained dry blend by a twin-screw extruder at the temperature of 170 DEG C-210 DEG C; and (3) adding master batches into a single-screw extruder for plasticization and extrusion, performing tape casting on a melt by a clothes hanger type mold head for forming a film, and further cooling, drawing and coiling by double rollers to obtain the PVDF agricultural plastic colored mulching film. The mulching film has relatively good mechanical properties and weather resistance, and has the functions of controlling the growth of weeds in soil, realizing heat preservation, mulching, preservation of soil moisture, water conservation and insect prevention of crops, preventing the loss of a fertilizer, promoting early maturing of the crops and improving the yield and quality of the crops.

Description

technical field [0001] The invention relates to a mulch film, in particular to a polyvinylidene fluoride agricultural plastic colored mulch film, and the thickness of the film is 10 μm to 80 μm. The present invention also relates to a method for manufacturing the polyvinylidene fluoride agricultural plastic colored plastic film. Background technique [0002] Since the application of plastic film to agricultural production in my country, production practice has proved that the application of agricultural plastic film covering cultivation technology can not only promote crop growth, increase crop production, increase farmers' income, but also change my country's traditional agricultural production methods. Among them, plastic film mulching cultivation technology can play the role of heat preservation and mulching, antifreeze, moisture conservation, light adjustment, water saving, weed control, insect control and soil salinity control, which can promote early maturity of crops,...

AI Technical Summary

Problems solved by technology

The most serious of these is the so-called "white pollution", especially the fragments of agricultural film left in the soil will gradually accumulate and form a barrier layer, which seriously affects the normal growth of plant roots, destroys soil heat transfer and water drainage, and ultimately results in reduced production.

my country is a big agricultural country, but in my country's agricultural film market, PE film is the main product, some are PVC film and EVA film, and the agricultural mulch film used in my country is generally thin (the thickness of mulch film produced by Chinese enterprises is 6 μm, and the thickness of the film in the United States is 6 μm. 24μm, 20μm in South Korea, 15μm in Japan) low strength, poor weather resistance and anti-aging performance. Whether it is peeling off the film at the right time for crops or at the end of crop harvest, the film is easy to break when using mechanical operations for winding and recycling. Affect the continuous operation of the machine, making it difficult to exert benefits

Furthermore, such agricultural film has poor availability after recycling, and the recycling cost is relatively high, so the economic gain outweighs the loss

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