Method for manufacturing heat-resistance polylactic acid water bottle

Abstract

The invention relates to a method for manufacturing a heat-resistance polylactic acid water bottle, and belongs to the field of polymer materials and processing application thereof. The method comprises the following steps: melting, extruding and granulating polylactic acid and a nucleating agent in a certain ratio by a twin-screw extruder, performing injection molding on the polylactic acid particles by injection equipment to form a bottle preform; heating and insulating the mouth part of the bottle preform in the die before the bottle preform is demolded to sufficiently crystalize. Therefore, the bottle preform is subjected to blow molding by blow molding equipment, the mouth and body parts of the bottle preform can be heated and insulated in the die before demolding, so that the bottle preform can be crystallized sufficiently, and the heat-resistance polylactic acid water bottle can be prepared finally. According to the method, the crystallization efficiency of the polylactic acid can be improved by virtue of the nucleating agent, and dies of injection and blowing two-step molding equipment can be improved, so that the bottle preform can be sufficiently crystallized in the die directly after being molded, and the product is more stable in size. The method enriches the molding process of heat-resistance polylactic acid products, and further expands the application field of polylactic acid, which is an emerging biological environment-friendly raw material.

Description

technical field [0001] The invention relates to a plastic molding processing method, more specifically, it relates to a method for manufacturing a heat-resistant polylactic acid water bottle, and the invention belongs to the field of polymer materials and their processing and application. Background technique [0002] Polylactic acid is a kind of polymer material obtained by chemical synthesis or biosynthesis with lactic acid as a monomer. The enzymes in the body catabolize it, and finally form carbon dioxide and water, so as not to affect the environment. Most of its raw materials are plant starch and fiber, which are highly renewable and do not rely on petroleum. At present, an upstream and downstream industrial chain has been initially formed to achieve sustainable and healthy development. Polylactic acid is considered to be one of the most promising materials to replace petroleum-based traditional plastics. It is widely used in packaging fields such as medicine, contain...

AI Technical Summary

Problems solved by technology

In-mold crystallization refers to heat preservation of the formed product before demolding to make it fully crystallized. The product obtained by this method has good dimensional accuracy and is not easy to deform, but the product cycle is longer; out-of-mold crystallization refers to the finished product after demoulding. , further heating and heat preservation through ovens, ovens, etc., to make it fully crystallized. This method has high injection molding efficiency, but the size and shape of the product are prone to change during secondary crystallization. It is suitable for low dimensional accuracy or wall thickness. thicker product