A simple and controllable low-cost industrial preparation method of high-strength heat-resistant PLA products

A low-cost, high-strength technology, applied in the field of biodegradable plastics, can solve the problems of difficulty in obtaining good synchronous regulation of heat resistance and mechanical strength, and the reduction of mechanical properties of PLLA/PDLA stereocomplexes. The effect of facilitating continuous production and increasing SC content

Active Publication Date: 2018-11-27
SICHUAN UNIV
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Problems solved by technology

[0008] The above methods and technologies also have a common disadvantage that the mechanical properties of PLLA / PDLA stereocomposites are often lower than PLLA to varying degrees, and it is difficult to obtain a good synchronization between the heat resistance and mechanical strength of the product.

Method used

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  • A simple and controllable low-cost industrial preparation method of high-strength heat-resistant PLA products
  • A simple and controllable low-cost industrial preparation method of high-strength heat-resistant PLA products
  • A simple and controllable low-cost industrial preparation method of high-strength heat-resistant PLA products

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Experimental program
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Embodiment 1-6

[0022] (1) Raw material drying: fully dry PLLA and PDLA so that the moisture content is lower than 0.005%;

[0023] (2) Twin-screw extrusion blending and compounding, high-speed stretching: 3-10wt% PDLA is fully mixed with the matrix PLLA and then melted and compounded with the twin-screw extruder, and then passed through the roller from the narrow slot die at high speed Pulling out, the drawing ratio is controlled at 1-15 to form a highly oriented sheet, and the cold air blast cooling is carried out synchronously during the pulling process. See Table 1 for the specific formulation and extrusion compounding process parameters.

[0024] (3) Product molding: collect PLLA / PDLA extrudates and directly introduce them into the feeding port of the injection molding machine for injection molding. The specific molding process parameters are shown in Table 2.

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Abstract

A simple and controllable low-cost industrial preparation method for high-strength heat-resistant PLA products, characterized in that: a small amount of PDLA is added to the PLLA matrix, and the orientation is achieved by blending and high-speed stretching with a twin-screw extruder equipped with a narrow slot die Stereocomplexes, and then directly plasticized to make PLA products.

Description

technical field [0001] The invention relates to a simple and controllable industrial preparation method of high-strength heat-resistant PLA products, belonging to the field of biodegradable plastics. Background technique [0002] Poly-L-lactic acid (PLLA) is a new green biopolymer and the most widely used variety in the PLA series. It has many advantages, such as good biodegradability, mechanical properties, and biocompatibility. It has been used in biomedicine and daily necessities. applications in other fields. However, the crystallinity of PLLA is poor, and the products obtained by ordinary processing are often in an amorphous state, and the heat-resistant temperature is poor (serious deformation occurs near the glass transition temperature, 50-65 ° C), which limits the potential application of PLLA in many fields. Many researchers in the scientific and business circles place their hopes on the stereocomplex crystal (SC), which has received a lot of attention in recent y...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04B29C47/12B29C47/40B29C47/88B29C48/07B29C48/30
CPCB29C48/07B29C48/906
Inventor 陈晨朱小康何本祥颜锦江
Owner SICHUAN UNIV
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