A kind of heat-resistant polylactic acid composition and preparation method thereof

A technology of composition and polylactic acid, which is applied in the field of heat-resistant polylactic acid composition and its preparation, can solve the problems of poor compatibility and poor performance of blends, and achieve low cost, good heat distortion temperature and high biomass content Effect

Active Publication Date: 2020-10-30
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the compatibility between PLA and starch is poor, because PLA is hydrophobic while starch is hydrophilic, this incompatibility eventually leads to poor performance of its blends

Method used

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  • A kind of heat-resistant polylactic acid composition and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Synthesis of modified starch: Weigh 100g of starch dried at 80°C for 24 hours and put it in a four-neck flask, and add a certain amount of ethyl acetate and a small amount of pyridine into the flask, stir vigorously for a period of time, and then add it dropwise to the flask Acryloyl chloride 3g, the reaction process does not need heating. After fully reacting, the modified starch is obtained by washing with absolute ethanol, centrifuging and drying.

[0028] (2) Preparation of starch graft copolymer: dry the prepared modified starch in a vacuum oven at 60°C for 24 hours, weigh a certain amount of starch and add it to a 500ml four-necked flask, and then take a certain amount of deionized Add water to the four-necked bottle, add ethyl acrylate, stir at high speed for pre-emulsification for a period of time, and then start to add potassium persulfate dropwise. After the reaction, the product was cooled to obtain a starch graft copolymer 1 emulsion. The mass ratio of...

Embodiment 2

[0030] (1) Synthesis of modified starch: Weigh 100g of starch dried at 80°C for 24 hours and place it in a four-necked flask, and add a certain amount of deionized water to the flask, adjust the pH to 8-9, and pour the starch into the flask after stirring for a period of time. 10g KH570 was added dropwise in the middle, the reaction temperature was 60°C, and the time was 6h. After fully reacting, the modified starch is obtained by washing with absolute ethanol, centrifuging and drying.

[0031] (2) Preparation of starch graft copolymer: dry the prepared modified starch in a vacuum oven at 60°C for 24 hours, weigh a certain amount of starch and add it to a 500ml four-necked flask, and then take a certain amount of deionized Add water to the four-necked bottle, add methyl acrylate, stir at high speed to pre-emulsify for a period of time, and then start to add potassium persulfate dropwise. After the reaction, the product was cooled to obtain the starch graft copolymer 2 emulsio...

Embodiment 3

[0033] (1) Synthesis of modified starch: Weigh 100g of starch dried at 80°C for 24 hours and place it in a four-necked flask, and add a certain amount of deionized water to the flask, adjust the pH to 8-9, and pour the starch into the flask after stirring for a period of time. Add 6g of GMA dropwise in the medium, the reaction temperature is 60°C, and the time is 6h. After fully reacting, the modified starch is obtained by washing with absolute ethanol, centrifuging and drying.

[0034] (2) Preparation of starch graft copolymer: dry the prepared esterified starch in a vacuum oven at 60°C for 24 hours, weigh a certain amount of starch and add it to a 500ml four-necked flask, and then take a certain amount of deionized Add water to the four-necked bottle, add butyl acrylate and methyl acrylate, stir at high speed for pre-emulsification for a period of time, and then start to add potassium persulfate dropwise. After the reaction, the product was cooled to obtain the starch graft...

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Abstract

The invention provides a heat-resistant polyactic acid composition and a preparation method thereof, and belongs to the technical field of high polymer materials. The composition consists of polylactic resin and a starch composition, and the weight ratio of the starch composition to the polylactic resin is (1: 99) to (50: 50). The starch composition contains a starch grafted copolymer and a nucleating agent; and the weight ratio of the starch grafted copolymer to the nucleating agent is 100: (1 to 100). Through a series of mixing of the raw materials, the polyactic acid composition is obtainedthrough melt blending. The heat-resistant polyactic acid composition is green and environmentally-friendly, low in cost and simple in technology, and the degradable polyactic acid composition with controllable performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a heat-resistant polylactic acid composition and a preparation method thereof. Background technique [0002] In recent years, biodegradable materials have been highly valued due to environmental concerns. Polylactic acid (PLA) is a linear aliphatic thermoplastic polyester that can be fermented from renewable resources such as corn. Polylactic acid has been widely studied due to its good strength, stiffness, biodegradability and processing properties, but its low toughness and low heat distortion temperature limit its application in more fields. At present, the main factors restricting the application and development of PLA include: slow crystallization rate, low crystallinity, low heat distortion temperature, high brittleness and relatively high cost. It is a cost-effective way to improve the toughness of PLA by blending flexible polymers such as PU, PE, E...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L51/02C08K5/20C08K9/04C08K3/34C08K5/098C08F251/00
CPCC08F251/00C08L67/04C08L2201/06C08L2201/08C08L51/02C08K5/20C08K9/04C08K3/34C08K3/346C08K5/098
Inventor 东为富胡琼恩李婷张洪吉马丕明陈明清
Owner JIANGNAN UNIV
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