One-step process prepares the method for polylactic acid film

Abstract

The invention relates to a method for preparing a polylactic acid film in one step, which belongs to the field of polymer materials, and is characterized in that: the polylactic acid melt obtained after polymerization in a polylactic acid polymerization reaction device is continuously output by a high-pressure melt delivery metering pump , and it is continuously input into the melt mixing device through the conveying pipeline with heating and heat preservation functions. Output, and continuously input into the melt mixing device through the conveying pipeline with heating and heat preservation functions, the polylactic acid and the toughening agent are mixed evenly by the melt mixing device to obtain a toughened and modified polylactic acid melt, and then The toughened and modified polylactic acid melt is continuously input into the film blowing machine through the conveying pipeline with heating and heat preservation functions, and the toughened and modified polylactic acid melt is blown by the film blowing machine to obtain polylactic acid film products.

Description

technical field [0001] The invention relates to the field of preparation of polymer materials, in particular to a method for preparing a polylactic acid film in one step. Background technique [0002] With the rapid development of the national economy, the use of polymer materials has penetrated into all areas of people's lives, bringing great convenience to our lives, especially plastic film materials, which are widely used. However, traditional plastic film materials are mainly prepared from petroleum-based materials, such as polypropylene and polyethylene. Thin film materials made of such materials are difficult to degrade when discarded in nature after use, leading to serious environmental pollution problems. With the increasing shortage of petroleum resources, people's high attention to environmental issues and the improvement of life quality requirements, the development of fully biodegradable polymer materials has become a research hotspot at home and abroad. [000...

AI Technical Summary

Problems solved by technology

[0006] Decreased performance due to high susceptibility to degradation of polylactic acid during processing

The preparation of polylactic acid film by two-step method increases the number of processing times of polylactic acid, on the one hand, it is easy to degrade polylactic acid and reduce its performance; on the other hand, it increases the preparation cost of polylactic acid film

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