Preparation method of environmentally friendly degradable agricultural film

Abstract

A preparation method of environmentally friendly degradable agricultural film is disclosed. The method includes 1) weighing raw materials including, by weight, 50-70 parts of film-grade polyethylene,20-30 parts of chitosan modified distarch phosphate, 3-6 parts of a rare earth modification liquid, 2-5 parts of activated cellulose whiskers, 10-20 parts of polyvinyl alcohol, and 2-6 parts of a degradation aid. The film-grade polyethylene as the base material and the distarch phosphate as an auxiliary material are adopted to improve degradability of the film; the distarch phosphate is modified starch, has high stability to influences caused by acid, base and shearing force, has high freezing stability and thawing stability, and after modification with chitosan, can improve degradability of the film when applied to the film. In addition, added polybutylene succinate is subjected to strip drawing after molding.

Description

technical field [0001] The invention relates to the technical field of agricultural films, in particular to a preparation method of an environmentally friendly and degradable agricultural film. Background technique [0002] Agricultural film is a general term for plastic films used in agricultural production. It plays a very important role in moisturizing and heat preservation during the sowing period. Weeding film is a new type of agricultural plastic film. made of medicine. Weeding mulch can be divided into the following two types. That is, mulch films containing herbicides and mulch films containing sunscreening agents, and mulch films containing sunscreening agents: based on high-pressure polyethylene resin and linear low-density polyethylene resin, black masterbatch and antioxidants are added, and ultraviolet The black film produced by the light absorber through a film blowing machine is widely used in high-efficiency agriculture because it does not contain herbicides...

AI Technical Summary

Problems solved by technology

[0003] The degradation efficiency of the film given in the existing literature is not very good, and the light transmittance is poor, which affects the growth efficiency of crops, so it needs to be further improved to increase its application rate

[0004] Chinese patent document (notification number: CN107254130B) discloses a degradable agricultural film, which involves the field of agricultural film technology, including the following process: (1) nano-Al3+ / TiO2 modified polyvinyl alcohol, esterified starch, plasticizer and After the water is mixed and stirred evenly, the mixed material is obtained; (2) the mixed material is added to a twin-screw extruder and extruded into a uniform transparent sol; (3) the sol is cast on a drum casting machine to form a film; (4) After drying, cooling, trimming and winding, the degradable agricultural film can be obtained. The film has good degradability, but the degree of degradation varies with different raw materials.

[0005] Chinese patent document (notification number: CN105478152B) discloses a nitrogen oxide degradation film and its preparation method. The raw material components of the degradation film are mainly composed of cerium acetylacetonate, barium acetylacetonate, potassium fluoride, melamine and graphene. Among them, Cerium acetylacetonate, barium acetylacetonate, potassium fluoride and melamine were used to prepare F and N co-doped BaCeO3 by sol-gel method, and the precursor powder was prepared by mixing graphene with F and N co-doped BaCeO3, and the casting The film-forming method obtains the nitrogen oxide degradation film, which is suitable for highly selective electrocatalytic degradation of nitrogen oxides, but the application effect in agricultural plastics is not very good