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Process for preparing starch-based film by propionyl-starch-grafting polylactic acid

A technology for propionylating starch and starch base, which is applied in the field of modification and modification of natural polymer materials, can solve the problems of complex process flow and a large number of organic solvents, and achieves the effects of simple reaction process, reduced pollution and improved hydrophobic performance.

Active Publication Date: 2009-01-07
佛山高峰淀粉科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

US patents 5,616,671, 5,693,786 and Chinese patent ZL 200510016771.0 have successively reported graft copolymers of starch and aliphatic polyesters such as PLA and PCL and their preparation methods, but the process is complicated and requires a large amount of organic solvents in the preparation process
The method of preparing starch-based film by grafting polylactic acid on propionylated starch has not been reported at home and abroad.

Method used

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  • Process for preparing starch-based film by propionyl-starch-grafting polylactic acid
  • Process for preparing starch-based film by propionyl-starch-grafting polylactic acid
  • Process for preparing starch-based film by propionyl-starch-grafting polylactic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Put starch with a water content of 20% in a kneader at a temperature of 80° C. and a rotating speed of 100 rpm. After mixing for 60 minutes, add 0.5 ml / g of propionic anhydride (calculated on the dry basis of starch) (shown in Table 1) to react After 30min, add 3ml / g of lactic acid (on starch dry basis) and a mass concentration of 0.5% Sn(Oct) 2 (Based on starch dry basis) (shown in Table 1), adjust the temperature of the reaction system to be 100°C and the pressure to be grafted for 10 hours under 10MPa; after the reaction is completed, dissolve in chloroform, precipitate with ethanol, filter, wash and dry The propionylated starch grafted polylactic acid copolymer was obtained. The propionyl substitution degree (DS) of starch molecules in propionylated starch grafted polylactic acid copolymer was 0.56, and the molecular substitution degree (MS) of polylactic acid was 1.95.

[0020] (2) Dissolve propionylated starch-grafted polylactic acid copolymer in acetone to f...

Embodiment 2

[0022] (1) Mix starch with a water content of 20% in a kneader at a temperature of 100° C. and a speed of 100 rpm for 60 minutes, then add 0.5 ml / g of propionic anhydride (calculated on the dry basis of starch) (as shown in Table 1) and react for 30 minutes Afterwards, add 3ml / g of lactic acid (in starch dry basis) and mass concentration be 0.5%Sn(Oct) 2 (Based on starch dry basis) (as shown in Table 1), adjust the temperature of the reaction system to be 100°C and the pressure to be grafted for 10 hours under 15MPa; after the reaction is completed, dissolve in chloroform, precipitate with ethanol, filter, wash and dry The propionylated starch grafted polylactic acid copolymer was obtained. The propionyl substitution degree (DS) of starch molecules in propionylated starch grafted polylactic acid copolymer was 0.67, and the molecular substitution degree (MS) of polylactic acid was 2.14.

[0023] (2) Dissolve propionylated starch-grafted polylactic acid copolymer in acetone to ...

Embodiment 3

[0025] (1) Mix starch with a water content of 20% in a kneader at a temperature of 80° C. and a rotation speed of 100 rpm for 60 minutes, then add 3 ml / g of propionic anhydride (calculated on the dry basis of starch) (as shown in Table 1) and react for 30 minutes. , adding 10ml / g of lactic acid (based on starch dry basis) and a mass concentration of 0.1% Sn(Oct) 2 (Based on starch dry basis) (shown in Table 1), adjust the temperature of the reaction system to be 120°C and the pressure to be grafted for 10 hours under 10MPa; after the reaction is completed, dissolve in chloroform, precipitate with ethanol, filter, wash and dry The propionylated starch grafted polylactic acid copolymer was obtained. The propionyl substitution degree (DS) of starch molecules in propionylated starch grafted polylactic acid copolymer was 1.38, and the molecular substitution degree (MS) of polylactic acid was 6.78.

[0026] (2) Dissolve propionylated starch-grafted polylactic acid copolymer in acet...

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Abstract

The invention discloses a preparation method for starch-based thin film with propionyl starch graft polylactic acid. The copolymer, which is obtained by that propionyl starch graft polylactic starch-based thin film is treated in a kneader by starch with a certain water content under a certain temperature and time, is added with propionic anhydride to react for a certain time and is grafted with lactic acid under the conditions of high temperature and high pressure, dissolves in acetone and is sprayed by a fluidized bed. The invention utilizes mechanical kneading and activation for the first time to obtain the propionyl of the starch and the graft copolymerization of the polylactic acid simultaneously with the help of the method of high temperature and high pressure, the whole reaction process is simple without any organic solvent, and the pollution to the environment is reduced. The grafting efficiency of the obtained copolymer is high. The modified starch thin film which is prepared by adopting the spray of the fluidized bed has good hydrophobicity as well as excellent mechanical performance, and can be used for the drug controlled-release carrier and the biodegradable material.

Description

technical field [0001] The invention relates to the field of modification of natural polymer materials, in particular to a method for directly preparing a starch-based film containing propionyl and polylactic acid side chains by using mechanical kneading and high temperature and high pressure. Background technique [0002] As a bulk agricultural product, starch occupies a very important position in renewable resources and is very suitable as a basic polymer for the development of environmentally friendly material products. The research and utilization of starch-based biodegradable materials have attracted great attention internationally. Among them, full starch plastics with a starch content of more than 90% are considered to be the most promising biodegradable materials to replace general-purpose plastics. [0003] However, since natural starch molecules contain a large number of hydroxyl groups and have strong hydrophilicity, its structure is quickly destroyed by water mo...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L3/06C08L67/04C08B31/04C08G63/08C08G63/78
Inventor 李晓玺陈玲彭旭李炳辉李琳
Owner 佛山高峰淀粉科技有限公司
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