Method for preparing aliphatic polyoxalate

A polyoxalate and aliphatic technology, which is applied in the field of preparation of high molecular weight polyoxalate, can solve the problems of high cost, difficulty in improving the molecular weight, etc., and achieve the effects of increasing yield, reducing dependence, and facilitating programming
CN102718948AActive Publication Date: 2012-10-10南通药享科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
南通药享科技有限公司
Publication Date
2012-10-10

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Abstract

The invention relates to a method for preparing aliphatic polyoxalate. The method includes the following steps of A, placing R1OOCCOOR2, dihydric alcohol, a catalytic agent and a stabilizing agent in a reaction device, under the nitrogen protection, increasing the temperature to 120 DEG C to 180 DEG C until reactants are completely melted, stirring the reactants at a constant temperature and maintaining an absolute pressure of the reaction at 200kPa to 600kPa to react for 2 to 6 hours; B, vacuumizing, maintaining an internal temperature at 150 DEG C to 155 DEG C and the absolute pressure at 30kPa to 40kPa for 1 to 2 hours, maintaining for 1 to 2 hours at the internal temperature of 160 DEG C to 165 DEG C and the absolute pressure of 5kPa to 15kPa, maintaining for 1 to 4 hours at the internal temperature of 180 DEG C to 200 DEG C and the absolute pressure below 100 Pa, discharging materials and performing vacuum drying; and C, smashing solids, and performing a solid phase polycondensation at the temperature of 100 DEG C to 125 DEG C and the absolute pressure below 100 Pa for 30 to 55 hours. According to the method for preparing the aliphatic polyoxalate, the decomposition problem of oxalate or oxalic ester is solved, and the molecular weight and viscosity of the obtained polyoxalate are high.
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Description

technical field

[0001] The invention relates to a preparation method of high molecular weight polyoxalate, which belongs to the technical field of polymer materials. Background technique

[0002] Traditional polyesters generally come from non-renewable petroleum resources and are difficult to degrade, causing white pollution. Therefore, the development of non-petroleum-based renewable and degradable plastics to replace traditional plastics is of great significance to the sustainable development of resources and the environment and environmental protection.

[0003] Aliphatic polyester has good biodegradability, and generally degrades into carbon dioxide and water in the environment, so it is a hot spot in the research of modern polyester plastics. The main problems of current aliphatic biodegradable materials are mechanical properties and cost issues. Common degradable polyesters include polylactic acid (PLA), polyglycolic acid (PGA), polyhydroxyalkanoate (PHA), poly(ε-cap...

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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