Process for preparing fatty polyester

The technology of aliphatic polyester and hydroxyl-terminated polyester is applied in the field of preparation of aliphatic polyester, which can solve the problems of difficult preparation, deepened product color, and many side reactions, and achieves the effects of simple preparation process and mild reaction conditions.

Inactive Publication Date: 2006-03-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, Japanese patents Ping 6-256461 and Ping 6-322091 adopt a two-step method of polycondensation and chain extension to prepare high molecular weight aliphatic polyesters with a molecular weight of more than 30,000. This method mainly uses dibasic acids and dibasic alcohols for polycondensation, and then The chain extender is used for chain extension. One type of chain extender used is diisocyanate (Ping 6-256461). This type of chain extender is toxic, and there are many side reactions during the chain extension process, which can easily cause the color of the product to deepen; the other type Chain extenders are polybasic acid anhydrides. For example, the patent of Ping 6-322091 uses tetrabasic acid dianhydrides. Due to the complex structure of the chain extender itself, it is difficult to prepare, which is not conducive to the industrialization of aliphatic polyester preparation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation of polydiethylene glycol adipate (PDA): with 44 parts (weight) adipic acid, 34 parts of diethylene glycol, 0.22 part of dibutyl tin oxide, 0.03 part of phosphorous acid under nitrogen protection, first in Polycondensation at 140-200°C, collect 70-80% of the generated water, switch to a decompression device, gradually reduce the pressure to 5mmHg, and react at 190-200°C for 4-5 hours until the acid value drops below 1. Obtain PDA oligomer. Calculated by hydroxyl value, its molecular weight (Mr) is 1348.

Embodiment 2

[0028] 50 parts of PDA oligomer (Mr is 1948), 3 parts of hexamethylcyclotrisilazane (HMCT), reacted at 100°C for about 10 hours under the protection of nitrogen until no ammonia gas is released, the number average molecular weight of the obtained polymer is 28,754, and the weight average molecular weight is 71,174.

Embodiment 3

[0030] 50 parts of PDA oligomers (Mr is 1348), 3.8 parts of octamethylcyclotetrasilazane (OMCT), reacted at 100°C for about 10 hours under nitrogen protection, until no ammonia gas was released, the number average of the obtained polymer The molecular weight was 32,870, and the weight average molecular weight was 70,048.

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PUM

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Abstract

The method for preparing high molecular weight fatty polyester whose number-average molecular weight is 28000-40000 and weight-average molecular weight is 6000-13000 by adopting two-stage process is characterized by that it utilizes binary acid, dibasic alcohol and (or) hydroxy acid to make polycondensation reaction to prepare terminal hydroxyl polyester performed polymer, then adopts organic silicon azane compound as chain extender to make chain expansion reaction, the mole ratio of terminal hydroxyl polyester performed polymer and organic silicon azane chain extender is 1:0.8-2.0, and the Chain expansion reaction temp. is at 90-200 deg.C. It is simple in preparation process, non-toxic, high-effective, moderate in reaction condition, and suitable for industrial production.

Description

Technical field: [0001] The invention relates to a preparation method of aliphatic polyester. In particular, the two-step method is used to prepare high-molecular-weight polyesters with a number-average molecular weight of 28,000-40,000 and a weight-average molecular weight of 60,000-130,000. Background technique: [0002] Currently used polyethylene, polypropylene, polystyrene and other plastics have excellent comprehensive properties and are widely used in agricultural mulch, various soft and hard packaging, utensils, fast food boxes and many other aspects. However, because these materials are very stable in nature, their wastes are difficult to degrade in nature, and it takes one to two hundred years to completely degrade. For this reason, since the 1980s, people have carried out a lot of research for the preparation of new degradable materials. Aliphatic polyester is a material that can be degraded and can be widely used in many aspects such as medical treatment, agric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/06
Inventor 赵京波杨万泰吴晓峰
Owner BEIJING UNIV OF CHEM TECH
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