A kind of biodegradable film, its preparation method and the mulch film containing the same

Abstract

The biodegradable film provided by the invention uses polyvinyl alcohol and rice husks as raw materials, wherein the rice husks can inhibit the growth of weeds in farmland and reduce the competition ability of weeds, thereby helping crops absorb more nutrients and grow rapidly; Due to the existence of rice husk, the film has shading properties, preventing weeds from photosynthesis and achieving better herbicidal effect; because rice husk is a microporous sheet material, it has certain air permeability, and in the process of film formation, it does not The regularly arranged rice husk fragments are easy to form pores through polyvinyl alcohol glue, so the film provided by the invention has moderate physical properties of air permeability and water permeability, does not affect the necessary oxygen content of the soil and water supply in the later stage, and can effectively Conservation of soil water and fertilizer; the biodegradable film provided by the present invention can begin to degrade in 3-5 months, and finally degrade into organic matter without pollution to the soil, loosen the soil, increase soil fertility, and be green and environmentally friendly.

Description

technical field [0001] The invention belongs to the field of agricultural production, and particularly relates to a biodegradable film, a preparation method thereof and a mulch film comprising the same. Background technique [0002] Plastic film mulching is an agricultural cultivation technology, which has the functions of increasing temperature, retaining water, retaining fertilizer, improving soil physical and chemical properties, improving soil fertility, inhibiting the growth of weeds, reducing diseases, and reducing humidity in the case of continuous rainfall. Thereby promoting plant growth and development, early flowering and fruiting, increasing yield and reducing labor costs. [0003] Because mulching has the effect of warming and moisturizing, it is conducive to the proliferation of soil microorganisms, accelerates the conversion of humus into inorganic salts, and is conducive to crop absorption. According to the determination, after covering with plastic film, the...

AI Technical Summary

Problems solved by technology

However, there are some adverse effects in the mulching cultivation of plastic film, such as causing inconvenience to the later soil water replenishment process, and covering the plastic film for many years, the residual film cannot be removed cleanly, causing soil pollution

In addition, the commonly used weeding film in agricultural production has black plastic film with good water retention but poor water permeability and non-woven film with good water permeability but high price and cost. Both of them have slow natural degradation rate and are easy to cause environmental pollution.