Fully biodegradable multifunctional mulch film and preparation method thereof

Abstract

The present invention provides fully biodegradable and multi-functional plastic mulch. The plastic mulch comprises, by weight percent: natural biopolymers of starch or derivatives thereof, biodegradable synthetic polymers, an interfacial reinforcer, a compound plasticizer with urea as a main ingredient, a nitrogen phosphorus and potassium compound fertilizer, pesticides, herbicides and trace fertilizers. The plastic mulch of the present invention not only has heat and moisture preservation functions, and is fully biodegradable after use, eliminating the contamination to soil causes by residual plastic mulch debris; and functional additives of fertilizers and nutrients, pesticides, herbicides etc. in the plastic mulch are sustainedly released as the plastic munch degrading, so the plastic mulch has long lasting effects of weed controlling, pest killing, and sustainedly released fertilizing, significantly reducing the use amount of fertilizers and pesticides, decreasing costs, and protecting the ecological environment. The invention also provides a method for preparing the multi-functional plastic mulch.

Description

technical field [0001] The invention relates to a plastic film, in particular to a degradable multifunctional plastic film and a preparation method thereof. Background technique [0002] Because mulch can increase soil temperature, maintain soil moisture, maintain soil structure, prevent pests from invading crops and diseases caused by certain microorganisms, and promote plant growth, it has been widely used in grain, cotton, oil, vegetables, melons, tobacco, More than 40 kinds of crops such as sugar, medicine, hemp, tea, and forests have generally increased the yield of crops by 10% to 50%, which has brought about changes in agricultural production methods and has been called the "White Revolution." [0003] However, due to the good stability of plastics, especially the use of a large amount of ultra-thin mulch, it is difficult to degrade after the film is broken into the soil for hundreds of years. A large amount of accumulation seriously affects the development of plant r...

AI Technical Summary

Problems solved by technology

However, the multifunctional plastic film obtained by this method uses a photodegradant to decompose the plastic film into fragments and cannot continue to decompose after entering the soil, which will pollute the soil

Secondly, since micro-fertilizers are inorganic salts and have poor compatibility with polyethylene, it is necessary to use polyvinyl alcohol aqueous solution as an adhesive to coat additives such as herbicides and micro-fertilizers on the film, which requires additional drying processes, complicated operations, and high costs. Increase

In addition, due to the water solubility of polyvinyl alcohol, the additive will be transferred to the soil at one time and does not have a slow-release function