Method for preparing polylactic acid-based high-elasticity copolymer

A technology of polylactic acid-based copolymers, which is applied in the field of preparation of polylactic acid-based high-elastic copolymers, can solve the problems of destroying the equimolar ratio of hydroxyl and carboxyl groups, the molecular weight of the product is not high, and the number of hydroxyl groups is increased, so as to increase efficiency, Simplify the refining process and improve toughness
CN101899139AActive Publication Date: 2010-12-01TONGJI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TONGJI UNIV
Publication Date
2010-12-01

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Abstract

The invention belongs to the field of high molecular materials, in particular relates to a method for preparing a polylactic acid-based high-elasticity copolymer, which comprises the following specific steps of: the preparation of a polylactic acid matrix; the preparation of a copolymer prepolymer; and chain extension reaction of the copolymer prepolymer. In the method, due to the adoption of abundant and readily available lactic acid, polymer polyols, isocyanate, polyalcohol and polyamine, the complex refining process during the use of lactide is simplified, and the industrial production is convenient; a flexible chain segment of the polymer polyols is introduced into a molecular chain of polylactic acid, the ductility of the polylactic acid is improved, and the application field of materials is expanded; end groups of the synthesized prepolymer are hydroxyl, and diisocyanate and the polyalcohol (the polyamine) are subjected to chain extension to improve the efficiency of the chain extension greatly; and the polyalcohol or the polyamine is added into a system, so the polymer after the chain extension forms a micro-crosslinked structure easily, and the heat resisting property of the polylactic acid-based copolymer is improved greatly.
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Description

technical field

[0001] The invention belongs to the field of polymer materials, and in particular relates to a preparation method of a polylactic acid-based high elastic copolymer. Background technique

[0002] As a biodegradable polymer material, polylactic acid has been extensively studied due to its biodegradable and renewable biofriendly properties. However, due to the slow crystallization rate and strong molecular chain rigidity of polylactic acid itself, the material has poor toughness, and it can only be used as a packaging material, which limits its wide application. Generally, the impact performance can be improved by plasticizing, chemical blending modification, and physical blending modification. But at the same time of modification, the tensile properties decreased drastically. In recent years, there are many methods for studying blend toughening, and a large number of toughening models have emerged.

[0003] For the application of various polymer materials, t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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