Method for manufacturing polyvinyl alcohol slow/controlled release film

Abstract

The invention relates to a method for manufacturing a polyvinyl alcohol slow / controlled release film, in particular to a method for manufacturing a polyvinyl alcohol slow / controlled release packaging film. The method is characterized by taking partial alcoholysis polyvinyl alcohol and complete alcoholysis polyvinyl alcohol as main raw materials; adding a plasticizing agent, a surface active agent and the like, and mixing and gluing the materials at the temperature of 85-95 DEG C, wherein the solid content of the glue solution is 13-18%; and manufacturing a film through a solution salivation method. Meanwhile, the slow / controlled release function is realized by automatically producing micro pores or micro gaps in water. By using the method provided by the invention, the slow release speed of the polyvinyl alcohol slow / controlled release film can be set according to users' demands. The film has slow / controlled release property and biological degradability in water, can be used for packaging various chemical products pesticides such as washing agents, pigments, dyes, cleaning agents, water treatment agents, mineral additives and the like requiring slow / controlled release and used in water, and can also be used as a packaging film for fruit bags and the like.

Description

technical field [0001] The invention relates to a film manufacturing technology, in particular to a method for manufacturing a polyvinyl alcohol sustained-release and controlled-release film capable of producing micropores or micro-slits when encountering water. Background technique [0002] At present, there are domestic reports about polyvinyl alcohol microporous or microslit slow-release film products, which are characterized by the presence of micropores in the film itself, and the use of micropores for bioseparation and drug release. The shortcoming of this kind of microporous sustained-release film is that the existence of micropores is unfavorable for packaging fine powders, liquid materials (such as emulsifiable concentrate pesticides) and the like. This limits the scope of application of the microporous sustained-release membrane in the market, and especially cannot meet the needs of some special occasions requiring adjustable slow-release speed. Contents of the i...

AI Technical Summary

Problems solved by technology

The disadvantage of this kind of microporous slow-release film is that the existence of micropores is not conducive to packaging fine powders, liquid materials (such as emulsifiable pesticides), etc.

This limits the scope of application of microporous slow-release membranes in the market, especially in some special occasions that require adjustable slow-release speeds.

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