Natural polymer film material with adjustable degradation rate and preparation method

Abstract

The invention discloses a natural polymer film material with an adjustable degradation rate and a preparation method, which belongs to the technical field of environmentally-friendly polymer film materials. The natural polymer film material comprises the following components in percentage by mass: 5 to 55 percent of water, 35 to 50 percent of natural starch, 5 to 30 percent of konjac fine flour, 5 to 10 percent of lactic acid, 0.1 to 5 percent of glycerin, and 0.001 to 1 percent of tackifier prepared from ammonia water and ethanol. Rich food-grade natural polymer materials, such as the natural starch, the konjac fine flour and the like, form a main raw material source, so the film material does not damage a human body, and can be completely degraded under natural conditions. Process parameters in a process comprising mixing, microwave treatment, curtain coating and sizing are adjusted to realize regulation and control over the degradation rate of the film material, greatly reduce the viscosity of glue solution, expand the viscosity range of the glue solution, reduce the processing cost of the film and avoid detriments to the environment. The film can be widely applied to packaging, food preservation, beauty masks, agricultural mulching films, medical consumables, hygienic products, biochemical isolation or dialysis, and the like.

Description

technical field [0001] The invention relates to a natural polymer film material with adjustable degradation rate and a preparation method thereof. The film material can be widely used in packaging, food preservation, beauty mask, agricultural mulching film, medical consumables, sanitary products, biochemical isolation or dialysis, etc. It belongs to the technical field of green and environment-friendly polymer film materials. Background technique [0002] Since the beginning of the 21st century, petrochemical resources such as petroleum and coal have been decreasing day by day, and the waste of some polymer materials and the volatilization of organic solvents coexist with it, which increasingly threatens the environment on which human beings depend. With the development of industry, chemically synthesized plastic products are widely used in the fields of food packaging and fresh-keeping because of their low price and stable properties. After use, they are difficult to degrad...

AI Technical Summary

Problems solved by technology

However, there are three major problems in composite polymer film materials such as patent No. ZL02115925.4 with starch and konjac powder as the main raw materials: one is easily soluble in water, and the degradation rate is uncontrollable

Konjac flour is a soluble polymer that melts in water, which is not suitable for most packaging materials

Second, it is very easy to grow mold

Starch and konjac powder are both food-grade natural polymers. Their composite films do not have any antibacterial or antibacterial ingredients, and are very easy to be infected with mold. They should be exposed to humid air or in a natural environment for two to three months. Mold will grow every day, which is not suitable for most packaging materials

Third, the processing cost is higher

Patent No. ZL 03128327, a blend film and its preparation method and application, involving a composite film blended with konjac glucomannan and poly(4-ethylene-N-alkylpyridine) quaternary ammonium salt, the raw material of this type of film higher cost