Preparation method of high-strength TPS starch for degradable materials

Abstract

The invention relates to the field of high polymer materials, and discloses a preparation method of high-strength TPS starch for degradable materials. The preparation method comprises the following steps: firstly, by utilizing a wet modified starch production process, adding a bio-enzyme preparation under the conditions of controlling the temperature and pH value, then controlling the temperature of obtained slurry, adding an inhibitor, carrying out cross-linking agent and esterification treatment to obtain modified starch, mixing and adding a starch matrix reinforcement material into powder in a dry method for treatment, adding a proper amount of glycerol and a modifier, extruding by a twin-screw extruder, air-cooling, slitting and granulating to obtain a thermoplastic TPS starch granular material with good strength. Compared with common starch, the thermoplastic TPS starch particle material has the advantage that the mechanical property can be improved by adding the thermoplastic TPS starch particle material into a degradable material.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a method for preparing high-strength TPS starch granule materials used for degradable materials. Background technique [0002] TPS starch is also known as thermoplastic starch, also known as "unstructured starch", which is to make the structure of starch disordered by certain methods to make it thermoplastic. The starch molecule is a polysaccharide molecular structure, containing a large number of hydroxyl groups. The role of hydrogen bonds between molecules and molecules makes it melt at a higher temperature. Appropriate modification technology can bring about changes in macromolecular hydroxyl groups and at the same time bring Due to the lower processable melting temperature, traditional plastic mechanical processing methods mostly use thermal processing, so to make good degradable starch plastics, it is necessary to make the added starch have better thermoplasticity. We know t...

AI Technical Summary

Problems solved by technology

Natural starch and degradable plastic resins have a large difference in polarity, poor mutual adhesion, and large disparities in many aspects such as interface fusion effects. Usually, it is necessary to add TPS starch with good strength and thermoplasticity to change the tensile strength of plastic products. Reduced, poor water resistance and other issues

As far as general starch is concerned, as the proportion of starch and degradable polyester materials increases, the cost will be significantly reduced, but the overall breaking strength and elongation of the molding material will be greatly affected. Therefore, how to use special The means of disordered molecular rearrangement of starch molecular structure to change the structural characteristics of starch molecules to obtain a thermoplastic TPS granular material with higher strength will be the next period, the majority of starch modification workers or completely A brand-new topic that biodegradable plastic production and R&D personnel need to overcome

Images