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A kind of preparation method of modified polylactic acid

A polylactic acid and modification technology, applied in the field of preparation of modified polylactic acid, can solve the problems of difficulty in obtaining high molecular weight polylactic acid, complex preparation process, large energy consumption, etc., and achieve low cost, simple process and high energy consumption. less effect

Active Publication Date: 2019-03-29
HANGZHOU MEDZONE BIO-TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Obviously, the former is restricted by many factors such as production process route, equipment and intermediate product purification, and its preparation process is complex, costly, and energy-consuming; while the direct condensation polymerization method has simple process, low energy consumption, and low cost, but this method is difficult to obtain. high molecular weight polylactic acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of modified polylactic acid, comprising the following steps:

[0024] (1) The weight percent is 60~65% lactic acid aqueous solution, in N 2 Add 8% polysiloxane oligomer under protection, adjust the temperature to 75-80°C after heating up, stir at a stirring speed of 280-300r / min; add chain extender, stir vigorously, control the speed at 1200r / min, keep warm The reaction was carried out for 0.5 hour. After the reaction was completed, triethylamine was added for neutralization to obtain a silicone-modified lactic acid water prepolymer solution.

[0025] (2) The silicone-modified lactic acid water prepolymer solution is mixed with the lactic acid aqueous solution in an amount of 1:1 by volume. After mixing, dehydration treatment is carried out at a temperature of 130-140°C and a pressure of 0.04-0.06MPa; Dehydration treatment is dehydration under reduced pressure.

[0026] (3) After dehydration, add polycondensation catalyst and stabilizer to carry o...

Embodiment 2

[0031] A preparation method of modified polylactic acid, comprising the following steps:

[0032] (1) The weight percent is 60~65% lactic acid aqueous solution, in N 2 Add 7% polysiloxane oligomer under protection, adjust the temperature to 70-90°C after heating up, stir at a stirring speed of 280-300r / min; add chain extender, stir vigorously, control the speed at 1700r / min, keep warm After the reaction was completed for 0.1 hour, triethylamine was added for neutralization to obtain a silicone-modified lactic acid water prepolymer solution.

[0033] (2) The silicone-modified lactic acid water prepolymer solution is mixed with the lactic acid aqueous solution in an amount of 1:1 by volume. After mixing, dehydration treatment is carried out at a temperature of 100-130°C and a pressure of 0.06-0.1MPa; Dehydration treatment is azeotropic dehydration. The azeotropic solvent is a mixture of xylene and trimethylbenzene.

[0034] (3) After dehydration, add polycondensation catalyst...

Embodiment 3

[0039] A preparation method of modified polylactic acid, comprising the following steps:

[0040] (1) The weight percent is 60~65% lactic acid aqueous solution, in N 2Add 10% polysiloxane oligomer under protection, adjust the temperature to 70-90°C after heating up, stir at a stirring speed of 280-300r / min; add chain extender, stir vigorously, control the speed at 1500r / min, keep warm After the reaction was completed for 0.3 hours, triethylamine was added for neutralization to obtain a silicone-modified lactic acid water prepolymer solution.

[0041] (2) The silicone-modified lactic acid water prepolymer solution is mixed with the lactic acid aqueous solution in an amount of 1:1 by volume. After mixing, dehydration treatment is carried out at a temperature of 130-160°C and a pressure of 0.02-0.05MPa; The dehydration treatment is azeotropic dehydration, and the azeotropic solvent used is diphenyl ether.

[0042] (3) After dehydration, add polycondensation catalyst and stabili...

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Abstract

The invention relates to a method for preparing a biodegradable high polymer material, and in particular to a method for preparing modified polylactic acid. The method comprises the following steps: modifying a lactic acid water prepolymer, dehydrating, performing polycondensation, performing solid phase polycondensation and the like, finally obtaining the modified polylactic acid with excellent performance. According to the improved raw material components and optimized preparation process, the prepared modified polylactic acid is high in polymerization transformation ratio, stable in quality and few in residues and volatile matters, has excellent performances in aspects such as moisture content, molecular weight, tensile strength and biocompatibility, and can meet the requirements of preparation of the traditional food grade films and packaging materials and the requirements of medical grade materials. Moreover, the method disclosed by the invention has the characteristics of simple process, low energy consumption and low cost, is environmental-friendly and harmless and can meet the requirement of the service performance of the material, and the performance of a synthetic material is improved.

Description

technical field [0001] The invention relates to a preparation method of a biodegradable polymer material, in particular to a preparation method of modified polylactic acid. Background technique [0002] Polylactic acid (PLA) has been applied in the medical field because of its unique physical properties and good biocompatibility. However, due to many factors such as the production process route, the purification of raw materials and intermediate products-especially the low yield of lactide prepared from lactic acid, the price of polylactic acid has been high, which limits the possibility of polylactic acid replacing petroleum-based materials. . [0003] At present, the main preparation route of polylactic acid is: fermentation of starch by microorganisms to produce lactic acid, prepolymerization under certain conditions and the action of a catalyst to obtain low molecular weight lactic acid oligomers, and then pyrolyzing the oligomers to prepare lactide. Then ring-opening ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/695C08G63/80
CPCC08G63/6952C08G63/80
Inventor 张洁裴明黎肖夏徐刚毅王利群涂克华
Owner HANGZHOU MEDZONE BIO-TECH CO LTD
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