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Polylactic acid composition with high toughness and high heat deformation temperature and preparation method thereof

A technology of deformation temperature and composition, applied in the field of high toughness, high heat deformation temperature polylactic acid composition and preparation thereof, can solve the problems of poor compatibility, poor blend performance and the like, achieve low cost, good heat deformation temperature, The effect of easy industrial production

Active Publication Date: 2018-11-20
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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  • Polylactic acid composition with high toughness and high heat deformation temperature and preparation method thereof
  • Polylactic acid composition with high toughness and high heat deformation temperature and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Synthesis of modified starch: Weigh 100g starch dried at 80℃ for 24h in a four-neck flask, and add a certain amount of ethyl acetate and a small amount of pyridine to the flask, stir vigorously for a period of time and then add dropwise to the flask Acrylic acid chloride 3g, the reaction process does not require heating. After full reaction, the modified starch is obtained by washing with absolute ethanol, centrifuging and drying.

[0027] (2) Preparation of starch graft copolymer: dry the prepared modified starch in a vacuum oven at 60℃, weigh a certain amount of starch into a 500ml four-neck flask, and then take a certain amount of deionized water Add to a four-necked flask, 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 starch graft copolymer 1 emulsion. The mass ratio of modified starch to ethyl acrylate is 1:1.

Embodiment 2

[0029] (1) Synthesis of modified starch: Weigh 100g of starch dried at 80℃ for 24h in a four-neck flask, and add a certain amount of deionized water to the flask, adjust the pH to 8-9, and stir for a period of time and then add it to the flask. 10g KH570 was added dropwise to the solution, the reaction temperature was 60°C, and the time was 6h. After full reaction, the modified starch is obtained by washing with absolute ethanol, centrifuging and drying.

[0030] (2) Preparation of starch graft copolymer: dry the prepared modified starch in a vacuum oven at 60℃, weigh a certain amount of starch into a 500ml four-neck flask, and then take a certain amount of deionized water Add to a four-necked flask, add methyl acrylate, stir at high speed for pre-emulsification for a period of time, and then start adding potassium persulfate dropwise. After the reaction, the product was cooled to obtain starch graft copolymer 2 emulsion. The mass ratio of modified starch to methyl acrylate is ...

Embodiment 3

[0032] (1) Synthesis of modified starch: Weigh 100g of starch dried at 80℃ for 24h in a four-neck flask, and add a certain amount of deionized water to the flask, adjust the pH to 8-9, and stir for a period of time and then add it to the flask. 6g GMA was added dropwise to the solution, the reaction temperature was 60°C, and the time was 6h. After full reaction, the modified starch is obtained by washing with absolute ethanol, centrifuging and drying.

[0033] (2) Preparation of starch graft copolymer: Dry the prepared esterified starch in a vacuum oven at 60°C, weigh a certain amount of starch into a 500ml four-neck flask, and then take a certain amount of deionized water Add to a four-necked flask, 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 starch graft copolymer 3 emulsion. The mass ratio of modified starch to ...

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Abstract

The invention provides a polylactic acid composition with high toughness and high heat deformation temperature and a preparation method thereof. The composition consists of polylactic acid resin and astarch complex. The weight ratio of the starch complex to the polylactic acid resin is (1:99) to (50:50). The starch complex is prepared by stirring and coprecipitation of clay and starch graft copolymer emulsion. The weight ratio of the starch graft copolymer to clay is 100:(1-100). The polylactic acid composition provided by the invention is prepared by a series of mixing and melt blending of raw materials. The polylactic acid composition provided by the invention is green and environment-friendly, has low cost and simple process, and a degradable polylactic acid-based composite material with controllable performance is obtained.

Description

Technical field [0001] The invention belongs to the technical field of polymer materials, and particularly relates to a polylactic acid composition with high toughness and high thermal deformation temperature and a preparation method thereof. Background technique [0002] In recent years, due to environmental issues, biodegradable materials have received great attention. Polylactic acid (PLA) is a linear aliphatic thermoplastic polyester, which can be obtained by fermentation from renewable resources such as corn. Polylactic acid has been extensively studied due to its good strength, rigidity, biodegradability and processing properties, but its low toughness and low heat distortion temperature limit its application in more fields. It is a cost-effective method to improve the toughness of PLA by blending flexible polymers such as PU, PE, EGMA, TPO, EVA, POE, PCL, PBAT, PHA, PBS and PBSA with polylactic acid. However, these polymers have the problem of non-biodegradability or hig...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L51/02C08K7/00C08J5/18C08B31/04C08B31/00C08B31/10C08F251/00C08F220/18C08F220/14C08F212/08
CPCC08B31/00C08B31/04C08B31/10C08F251/00C08J5/18C08L67/04C08J2451/02C08L2201/08C08L2201/06C08J2367/04C08L51/02C08K7/00C08F220/18C08F220/1802C08F220/1804
Inventor 东为富胡琼恩李婷马丕明张洪吉陈明清
Owner JIANGNAN UNIV
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