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Preparation method of low-cost heat-resistant food grade polylactic acid material

A polylactic acid material, low-cost technology, applied in the field of polymer materials, can solve the problems of PLA application limitation, slow PLA crystallization rate, poor heat resistance of PLA, etc. Effect

Inactive Publication Date: 2016-09-14
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Polylactic acid (PLA) is a renewable and degradable green plastic, but the crystallization rate of PLA is very slow, and it is almost an amorphous polymer after processing, resulting in poor heat resistance of PLA, and the heat deflection temperature (HDT) of injection molded samples ) is only about 58°C, which limits the application of PLA

Method used

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  • Preparation method of low-cost heat-resistant food grade polylactic acid material
  • Preparation method of low-cost heat-resistant food grade polylactic acid material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Clean the experimental equipment, weigh the experimental drugs (500g of dehydrated D-lactic acid, 3g of stannous octoate, 3g of toluene-4-sulfonic acid), and build the experimental device; 2 , to condense water, start the reaction, gradually increase the temperature to polymerize, and raise the temperature to 120°C for 2 hours, to 150°C for 2 hours, and to 170°C for 1 hour. Will N 2 The device was disassembled, the reaction flask was sealed, and the condenser section was connected to a vacuum pump, and the vacuum was pumped at a low power until no more water droplets dripped. Remove the condensing device, connect the vacuum pump directly to the flask, pump the vacuum with high power, and react for 8 hours. After the reaction, the product was poured out and cooled.

[0023] Pour the cooled sample into a 1000mL beaker, dissolve it with dichloromethane, seal it and let it stand until the sample is completely dissolved, add absolute ethanol to the beaker, white precipitat...

Embodiment 2

[0026] Clean the experimental equipment, weigh the experimental drugs (300g of dehydrated D-lactic acid, 1.8g of stannous octoate, 1.8g of toluene-4-sulfonic acid), and build the experimental device; 2 , to condense water, start the reaction, gradually increase the temperature to polymerize, and raise the temperature to 120°C for 2 hours, to 150°C for 2 hours, and to 170°C for 1 hour. Will N 2 The device was disassembled, the reaction flask was sealed, and the condenser section was connected to a vacuum pump, and the vacuum was pumped at a low power until no more water droplets dripped. Remove the condensing device, connect the vacuum pump directly to the flask, pump the vacuum with high power, and react for 12 hours. After the reaction, the product was poured out and cooled.

[0027] Pour the cooled sample into a 1000mL beaker, dissolve it with dichloromethane, seal it and let it stand until the sample is completely dissolved, add absolute ethanol to the beaker, white preci...

Embodiment 3

[0030] Clean the experimental equipment, weigh the experimental drugs (200g of dehydrated D-lactic acid, 1.2g of stannous octoate, 1.2g of toluene-4-sulfonic acid), and build the experimental device; 2 , to condense water, start the reaction, gradually increase the temperature to polymerize, and raise the temperature to 120°C for 2 hours, to 150°C for 2 hours, and to 170°C for 1 hour. Will N 2 The device was disassembled, the reaction flask was sealed, and the condenser section was connected to a vacuum pump, and the vacuum was pumped at a low power until no more water droplets dripped. Remove the condensing device, connect the vacuum pump directly to the flask, pump the vacuum with high power, and react for 16 hours. After the reaction, the product was poured out and cooled.

[0031] Pour the cooled sample into a 1000mL beaker, dissolve it with dichloromethane, seal it and let it stand until the sample is completely dissolved, add absolute ethanol to the beaker, white preci...

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Abstract

The invention discloses a preparation method of a low-cost heat-resistant food grade polylactic acid material. The method includes: adopting D-lactic acid as the raw material to synthesize oligomeric PDLA with a molecular weight of 2500-20000, conducting purification filtering to obtain pure PDLA, subjecting dried PDLA and industrial grade PLA in certain proportion to melt blending to prepare the low-cost heat-resistant polylactic acid material. The invention utilizes the characteristics of low cost, numerous molecular chains and good fluidity of oligomeric PDLA, which can form stereocomplex crystals in situ with a PLLA molecular chain in industrial grade PLA, and the stereocomplex crystals themselves have the effect of a nucleating agent, can promote the formation of the PLLA molecular chain into homogeneous crystals, and improve the crystallization rate and crystallinity of industrial grade PLA, thus improving the heat resistance of the polylactic acid material.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a method for preparing a low-cost heat-resistant food-grade polylactic acid material. Background technique [0002] With the development of material science, polymer materials have been applied to all aspects of life. General-purpose polymer materials, such as polyethylene, polypropylene, polystyrene, etc., are all derived from non-renewable resources-petroleum, and do not have degradable properties. characteristics, will pollute the environment. Therefore, looking for green materials has become a hot spot. [0003] Polylactic acid (PLA) is a renewable and degradable green plastic, but the crystallization rate of PLA is very slow, and it is almost an amorphous polymer after processing, resulting in poor heat resistance of PLA, and the heat deflection temperature (HDT) of injection molded samples ) is only about 58°C, which limits the application of PLA. In terms of i...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08G63/08
CPCC08L67/04C08G63/08C08L2201/06C08L2201/08C08L2205/025
Inventor 李锦春屈鑫吴蓉邹国享赵彩霞
Owner CHANGZHOU UNIV
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