A kind of high-strength three-layer two-color agricultural mulch film and its preparation method

Abstract

The invention relates to the technical field of agricultural plastic products, in particular to a high-strength three-layer two-color agricultural mulch film and a preparation method thereof. The high-strength three-layer two-color mulch film is a three-layer composite structure produced by a co-extrusion blown shed film unit, including an inner layer, a middle layer and an outer layer; each layer of the three-layer composite structure contains polyethylene base High-performance polymer; the raw materials for the preparation of the middle layer include white masterbatch.

Description

technical field [0001] The invention relates to the technical field of agricultural plastic products, in particular to a high-strength three-layer two-color agricultural mulch film and a preparation method thereof. Background technique [0002] Mulch film is the ground covering film, which is used for ground covering to increase soil temperature, maintain soil moisture, maintain soil structure, prevent pests from invading crops and diseases caused by certain microorganisms, etc., and promote plant growth. It has been many years since the development and application of plastic mulch to cover crops on the ground. Now this technology is indispensable in agricultural production. Further stretching in the longitudinal direction makes the film thinner and the physical strength is not enough. In addition, at present, mulch has developed from ordinary mulch to various monochrome mulch (such as black mulch, white mulch, single colored mulch), black and white mulch and composite mulc...

AI Technical Summary

Problems solved by technology

Among them, the light transmittance of the black mulch film is low, and the heat is not easily transmitted to the soil. Therefore, the performance of preventing soil water evaporation is relatively strong, and can significantly inhibit the growth of weeds. However, due to the low soil temperature, it is not conducive to crop growth, causing crops At the same time, the black heat absorption effect is obvious, and the mulch film is easy to accelerate aging due to heat absorption, and the phenomenon of early rotten film appears, which seriously affects the service life of the film, and the rotten film is not easy to clean from the field. pollutes the soil and affects crop yields

White mulch and other monochrome transparent mulch have better light transmittance, and after covering this kind of film, the effect of soil warming and moisturizing is good, and generally the temperature of the soil plow layer can be increased by 2-4°C; Weeds also grow luxuriantly, which in turn competes with crops for water and fertilizer, affecting yields

Black and white mulch, that is, black on both sides and white in the middle, because the two sides are black mulch, it also has the disadvantage of premature rot due to heat absorption and aging, which will pollute the soil and affect crop yields

In the silver-gray black composite mulch, when the light reflection effect of the silver-gray mulch layer is not strong or not obvious, the mulch is prone to accelerated aging due to heat absorption, and premature rotten films will appear.

[0003] In addition, the quality of plastic film is generally poor. If the service life is short, the effective use period of the plastic film is set to be short when the plastic film is produced. The performance or physical and chemical properties of the original material are already very low

These factors lead to the poor ability of the common mulch film in use to resist wind damage during use. There is a lot of soil on the film surface of the seed bed, the lighting surface is relatively small, and the mulch film is difficult to recycle. Great harm, affecting agricultural production

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