Method and device used for melt injection molding of fully-biodegradable material

Abstract

The invention relates to a method and a device used for the melt injection molding of a fully-biodegradable material. The fully-biodegradable material refers to a material which can be degraded or decomposed by generating chemical, biological or physical reactions under the action of natural microorganisms. The preparation process of a raw material molten mass comprises three areas including a feeding section, a plasticizing section and an extruding section, and the raw material is heated in each area by adopting a sectional gradual heating mode; besides, the front end (close to one side of a die) of the extruding section is provided with an ultrasonic mixer; and simultaneously, the inner wall of a charging barrel of the injection molding device is a non-smooth surface. The device has a compact structure, is convenient to use and maintain, and has good safety. The device and the method can reduce the viscosity of the material in molding, reduce the adhesion of the material to the tube wall of the charging barrel, and reduce the phenomena on the surface of the die. Simultaneously, the method and the device shorten the process flow, improve the process stability, and can greatly improve the yield of the molded products of the fully-biodegradable material.

Description

technical field [0001] The invention relates to a melting injection molding method of fully biodegradable materials and molding equipment thereof, and belongs to the field of biodegradable polymer material molding processing technology. Background technique [0002] With the rapid development of polymer materials industrial technology, this material has been listed as the four pillar materials of national economic development along with steel, wood, and cement. Polymer materials have been applied to various sectors of the national economy and various fields of people's lives. However, because it is difficult to degrade, with the increasing usage, the "white pollution" caused by polymer materials has become a worldwide public hazard. Italy, Germany, the United States and other countries have taken the lead in stipulating the range of products that must use degradable polymer materials in the form of laws; my country's current production and use of polymer materials has leapt ...

AI Technical Summary

Problems solved by technology

Due to the special molecular structure, compared with the current general-purpose plastics, fully biodegradable materials have poor thermal stability and low glass transition temperature. When using conventional injection molding to produce products, the melt is prone to adhesion due to the high viscosity of the melt. On the inner wall of the barrel and the surface of the screw, it adheres to the mold, causing problems such as demoulding and difficulty in mold cleaning. Therefore, the processing technology is extremely difficult to control

On the one hand, the above problems greatly increase the cost of fully biodegradable material products, and at the same time, to a certain extent, limit the wide range of applications of this material

For fully biodegradable materials, there is currently no special equipment for mass production of products

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