Water-soluble biodegradable material, and its preparing method and membrane product

Abstract

The invention relates to water solubility biodegradable material. The material contains the outcome formed by mixture fusing which contains starch, polyhydric alcohol, and aqueous polyvinyl alcohol which has hydrophilicity. Using the mixture total weight as the criterion, the content of the polyhydric alcohol is 19-40wt%. Its fusing temperature is 140-190 degree centigrade; decomposition temperature is 250-400 degree centigrade. Thus it can be made into film products by blow molding forming which is biodegradable, has high tensile break strength reached to 65 megapascal, 398% percentage elongation at rupture at the condition of high starch content.

Description

technical field [0001] The invention relates to a biodegradable material, a preparation method thereof, and a film product containing the material, more particularly to a water-soluble biodegradable material, a preparation method thereof, and a film product containing the material. Background technique [0002] CN1405230A discloses a water-soluble, non-polluting and fully biodegradable plastic molding material in a short period of time, which contains polyvinyl alcohol, glycerol, diethylene glycol, sorbitol, fiber, white carbon black, Superfine calcium, modified starch. CN1405230A also discloses the preparation method of the material: add 1-30 parts of glycerol to the polyvinyl alcohol raw material, stir at high temperature, make it fully wet, and then add an appropriate amount of auxiliary plasticizer, crosslinking agent, Reinforcing agents, modifiers, fillers, etc.; then, blending and reacting at a temperature of 25-65°C for 5-50 minutes, and then adding the obtained mate...

AI Technical Summary

Problems solved by technology

Therefore, even if a plasticizer is added, the plasticizer still cannot enter the polyvinyl alcohol to modify it, nor can it improve the plasticity of the polyvinyl alcohol very well, but can only be absorbed by starch, so the above mixture is water-containing The mixture of starch, polyvinyl alcohol, plasticizer and additives and other components still cannot achieve a molten state, and can only be made into film products by conventional casting methods, and cannot be blown into film by other methods that need to go through a molten state.