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Method for synthesizing polylactic acid by catalyzing lactide ring-opening polymerization by using novel catalyst

A technology of ring-opening polymerization and catalyst, which is applied in the field of synthesis of polylactic acid by catalyzing ring-opening polymerization of lactide with a new catalyst, which can solve the problems of poor catalyst stability, low reaction rate, and poor product performance, and achieve low synthesis cost and catalytic efficiency. High, improved yield and purity effects

Inactive Publication Date: 2020-12-25
安徽英特力工业工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the low reaction rate of lactide ring-opening polymerization synthesis of polylactic acid in the prior art, the poor product performance, the poor stability of the catalyst used in the reaction, etc., and propose a new catalyst to catalyze the lactide ring-opening Method for polymerizing polylactic acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of method that utilizes novel catalyst to catalyze the ring-opening polymerization of lactide to synthesize polylactic acid that the present invention proposes comprises the following steps:

[0026] S1. Under vacuum conditions, the raw material lactic acid is heated to 80°C for preliminary dehydration and degassing treatment. According to the mass ratio of 1:30, the treated catalyst I and lactic acid are added to the prepolymerization tank, and the temperature is raised to 120°C under reduced pressure. Prepolymerization obtains lactic acid oligomers; the catalyst I is obtained by mixing and compounding butyl titanate, lanthanum oxide and graphene oxide with a mass ratio of 3:1:5;

[0027] S2. According to the mass ratio of 100:1, add the lactic acid oligomer and the mixture I to the depolymerization tank together, under vacuum conditions, set the reaction temperature to 150°C, and feed the concentration of 99% into the depolymerization tank In the depolymerizati...

Embodiment 2

[0035] A kind of method that utilizes novel catalyst to catalyze the ring-opening polymerization of lactide to synthesize polylactic acid that the present invention proposes comprises the following steps:

[0036] S1. Under vacuum conditions, the raw material lactic acid is heated to 90°C for preliminary dehydration and degassing treatment, and the treated catalyst I and lactic acid are added to the prepolymerization tank at a mass ratio of 1:35, and the pressure is reduced and the temperature is raised to 125°C. Prepolymerization obtains lactic acid oligomers; the catalyst I is obtained by mixing and compounding butyl titanate, lanthanum oxide and graphene oxide with a mass ratio of 4.5:1:7;

[0037] S2. According to the mass ratio of 120:1.5, add the lactic acid oligomer and the mixture I to the depolymerization tank together, under vacuum conditions, set the reaction temperature to 155°C, and feed the concentration of 99% into the depolymerization tank In the depolymerizati...

Embodiment 3

[0045] A kind of method that utilizes novel catalyst to catalyze the ring-opening polymerization of lactide to synthesize polylactic acid that the present invention proposes comprises the following steps:

[0046] S1. Under vacuum conditions, the raw material lactic acid is heated to 95°C for preliminary dehydration and degassing treatment. According to the mass ratio of 1:40, the treated catalyst I and lactic acid are added to the prepolymerization tank, and the temperature is raised to 130°C under reduced pressure. Prepolymerization obtains lactic acid oligomers; the catalyst I is obtained by mixing and compounding butyl titanate, lanthanum oxide and graphene oxide with a mass ratio of 5:1:8.5;

[0047] S2. According to the mass ratio of 140:1.5, the lactic acid oligomer and the mixture I are jointly added to the depolymerization tank. Under vacuum conditions, the reaction temperature is set at 160 ° C, and the concentration of 99% is passed into the depolymerization tank. I...

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Abstract

The invention belongs to the technical field of polyester catalytic synthesis, particularly relates to a method for synthesizing polylactic acid by catalyzing lactide ring-opening polymerization witha novel catalyst, and solves the problems of low reaction rate, poor product performance, poor stability of a catalyst for reaction and the like in the process of synthesizing polylactic acid by lactide ring-opening polymerization in the prior art. The method comprises the following steps: S1, dehydrating and degassing raw material lactic acid, and adding a catalyst I for prepolymerization to obtain a lactic acid oligomer; s2, jointly adding the lactic acid oligomer and the mixture I into a depolymerization kettle for depolymerization to generate lactide; and S3, jointly adding lactide and a catalyst II into the polymerization kettle, and carrying out ring-opening polymerization to synthesize polylactic acid. The raw materials are easy to obtain, the synthesis method is simple, the synthesis cost is low, industrial production is easy, the synthesized polylactic acid is high in yield, high in molecular weight and narrow in distribution, and the polylactic acid has good biodegradabilityand biocompatibility and can be widely applied.

Description

technical field [0001] The invention relates to the technical field of polyester catalytic synthesis, in particular to a method for synthesizing polylactic acid through ring-opening polymerization of lactide catalyzed by a novel catalyst. Background technique [0002] Polylactic acid is a polymer obtained by polymerization of lactic acid as the main raw material. It is a new type of biodegradable material with good thermal stability. The processing temperature is 170-230°C. It has good solvent resistance and can be processed in various ways. , such as extrusion, spinning, biaxial stretching, injection blow molding. At present, polylactic acid is synthesized by various methods, including direct condensation, lactide ring-opening polymerization and other synthetic methods. The polylactic acid prepared by the direct method is limited by the reaction conditions, such as the accumulation of water generated in the reaction and the increase of the reaction viscosity, so that the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/85C08G63/84C08G63/87C08G63/08C12P7/56
CPCC08G63/823C08G63/87C08G63/08C12P7/56
Inventor 刘兴然张华李炳亮宋钊黄海洋陈宇
Owner 安徽英特力工业工程技术有限公司
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