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Catalyst for producing polylactic resin and its prodn. process

A technology of catalyst and polylactic acid, which is applied in the field of catalyst and its production process for the production of polylactic acid, can solve the problems of astonishing fixed cost investment and high requirements for equipment in industrial production, achieve increased unit output rate, shorten reaction time, and benefit The effect of industrialized mass production

Inactive Publication Date: 2006-09-13
RUGAO FIBERGLASS FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using this process for polymerization, the purity of the intermediate monomer lactide is very high, and it usually needs to be crystallized 5-6 times, and the whole reaction process has high requirements for equipment. Correspondingly, the fixed cost investment of industrial production is also very high. amazing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Put lactide with a melting range between 92 and 108°C into the reaction vessel, stir and heat to 70°C, under N 2 Vacuumize to 2000Pa under the environment, after fully removing the water, add 1 / 5000 composite catalyst formulation and mix evenly; replace the air in the reaction vessel with high-purity nitrogen twice, maintain positive pressure, stir and heat slowly. The reaction temperature was 185°C. As the reaction proceeded, the reactant gradually became viscous, and the reaction ended after 5 hours. The acceptance rate of the polylactic acid is over 99%, the molecular weight is about 120,000, and it belongs to a partially crystalline polymer. After 6 months of dry storage at room temperature, the molecular weight of the sample decreased by about 35%.

Embodiment 2

[0025] Put lactide with a melting range between 92 and 108°C into the reaction vessel, stir and heat to 70°C, under N 2 Vacuumize to 2000Pa under the environment, after fully removing the water, add 1 / 6500 composite catalyst formulation, mix evenly, replace the air in the reaction vessel with high-purity nitrogen twice, maintain positive pressure, stir and heat slowly. The reaction temperature was 185°C. As the reaction proceeded, the reactant gradually became viscous, and the reaction ended after 6 hours. The acceptance rate of the polylactic acid is above 99%, the molecular weight is about 180,000, and it belongs to a partially crystalline polymer. After 6 months of dry storage at room temperature, the molecular weight of the sample decreased by about 25%.

Embodiment 3

[0027] Put the lactide into the reaction vessel, stir and heat to 70°C, under N 2 Vacuumize to 2000Pa under the environment, after fully removing water, add 1 / 10000 composite catalyst formulation, mix evenly, replace the air in the reaction vessel with high-purity nitrogen twice, maintain positive pressure, stir and heat slowly. The reaction temperature was 185°C. As the reaction proceeded, the reactant gradually became viscous, and the reaction ended after 8 hours. The acceptance rate of the polylactic acid is above 99%, the molecular weight is about 210,000, and it belongs to a partially crystalline polymer. After 6 months of dry storage at room temperature, the molecular weight of the sample decreased by about 23%.

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Abstract

The invention relates to an analyzer producing the polylactic and the producing process of producing the polylactic adopting the analyzer , characterized in that it is composed by the composite containing the strontium and the aluminium namely the compound system of the bimetal o-oxo bridge alkoxylating compound and the benznene sulfonic acid; the mol content of the said bimetal o-oxo bridge alkoxylating compound is 40-90 percent; the process of producing the polylactic adopting the analyzer : (1)the lactide of the melting range of 92-108 degree is embedded in the reactor and chilled, heated up; (2) it is vacuumized to dewater fully on the N2 condition; (3) the definite proportion of the composite catalyst mixing agent of the Sr and aluminium are added and mixed equably; (4) the air of the reactor is displaced by the highly pure nitrogen gas in order to keep the positive pressure; (5) It is mixed and heated up and the reaction can be finished within 4-16 hours. Because of adopting the analyzer to the production, the puzzle of the high purify requirement of the gathering monocase lactide needed by the existing ring-opening polymerization; so the reaction time is shortened, the producing rate is improved and the producing cost is reduced.

Description

technical field [0001] The invention relates to a catalyst for producing polylactic acid and a process for producing polylactic acid using the catalyst. Background technique [0002] After retrieving relevant patent documents, no catalyst for producing polylactic acid identical to the present invention and a process for producing polylactic acid using the catalyst have been found. Polylactic acid (PLA) is a new type of biodegradable polymer resin material, usually also called polylactide or corn plastic, which is mainly made of corn, wheat, sugar beet and other agricultural products containing starch or sugar powder, and produced by fermentation It is made of L-lactic acid with high optical purity and then polycondensed in vacuum. It is a completely degradable biological material that decomposes into carbon dioxide and water after degradation. Through the photosynthesis of plants, carbon dioxide and water can be turned into starch, which circulates in nature to form an eco...

Claims

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Application Information

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IPC IPC(8): C08G63/02C08G63/84
Inventor 顾泽波阮刘文彭春阳李庚
Owner RUGAO FIBERGLASS FACTORY
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