Manufacture method of heat-tolerance poly-lactic resin ejection formed piece

Abstract

The invention relates to a method for producing a heat-resistant polylactic resin injection molded product, which comprises the following steps: after mixture containing a raw material of polylactic acid and a component of nucleating agent is conveyed to an injection molding machine to be preliminarily molded into a semi-finished product, the semi-finished product is quickly cooled down below a preset temperature, taken out from the die, moved to a heating device for reheating, and heated at the temperature between 100 and 150 DEG C to be produced into a molded product; after the heating is finished, the molded product is cooled down below the glass transition temperature of the raw material of polylactic acid and then taken out, so as to obtain the heat-resistant injection molded product. Through the reheating treatment, the semi-finished product can still have stable structure through recrystallization; besides, the time of using the molding die for the semi-finished product can be reduced; therefore, the production efficiency can be effectively improved, and the production cost can be reduced.

Description

technical field [0001] The present invention relates to a method for manufacturing a polylactic acid resin molded article, in particular to a method for manufacturing a heat-resistant polylactic acid resin injection molded article. Background technique [0002] Although high-molecular polymer materials based on petroleum are widely used as daily necessities, such high-molecular polymers, such as polyethylene, polypropylene, polystyrene, polyvinyl chloride, etc., are difficult to recycle after use Utilization, and because of its stable structure, it is not easy to be decomposed in the natural environment, which has a great impact on the environment. Therefore, the research on the recycling mechanism of high molecular polymers and decomposable high molecular polymers is becoming more and more important. [0003] Among them, polylactic acid (PLA for short, also known as polylactide) is a degradable material with relatively many researches and applications at present. It is a ki...

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Problems solved by technology

[0009] 1. After the mixture is injection molded into the injection semi-finished product, the injection semi-finished product must be allowed to cool slowly, and must stay in the injection mold for a long time, otherwise it will cause poor crystallization and affect the heat resistance and mechanical properties of the final product Intensity, because the injection semi-finished product must stay in the injection mold to slowly lower the temperature to make the polylactic acid form perfect crystallization, resulting in a relatively lengthy injection process time, and because the mold must wait for the semi-finished product to drop to an appropriate temperature, and The next injection process can only be carried out after the molded product is taken out, which makes the existing manufacturing method relatively have the disadvantage of poor process efficiency

[0010] 2. Since the semi-finished product must be slowly and stably cooled in the mold before it can be taken out into the molded product, in addition to the limited process efficiency, the high time and cost of the produced heat-resistant polylactic acid The cost of resin injection molded products is also higher, which is not conducive to popularization and use

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