Prepn process of biodegradable polyamidoester

A polyamide ester and biodegradation technology, which is applied in the field of high molecular weight biodegradable polyamide ester and the preparation of biodegradable polyamide ester, can solve the problem that the preparation of hydroxyl-terminated polyester prepolymer is cumbersome, time-consuming, polylactic acid Stereoregularity destruction and other problems, to achieve the effects of good crystallinity and biodegradability, simple preparation, and low temperature of chain extension reaction

Inactive Publication Date: 2007-08-22
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

In the application of Chinese patent 200510093775.9, hydroxyl-terminated polyester prepolymers (oligomers) were prepared by polycondensation, and aliphatic diacyl bis-lactams and aromatic diacyl bis-lactams were melt-chain-extended to prepare number-average molecular weights up to 50,000. Aliphatic polyester can be carried out under a lower vacuum degree and a wider feed ratio, which is easy to operate, but the preparation of the hydroxyl-terminated polyester prepolymer is still relatively cumbersome and time-consuming, and the

Method used

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  • Prepn process of biodegradable polyamidoester
  • Prepn process of biodegradable polyamidoester
  • Prepn process of biodegradable polyamidoester

Examples

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Example Embodiment

[0031] Example 1: Preparation of polybutylene adipate (PBA): 50 parts by weight of adipic acid, 31 parts of butanediol, 0.24 parts of dibutyltin oxide, under the protection of nitrogen, from 140°C Gradually increase the temperature to 170°C for polycondensation reaction. After collecting 70-80% of the generated water, switch to a decompression device. The pressure is gradually reduced to 1mmHg and react at a temperature range of 190-220°C for 4 to 5 hours until the acid value is basically unchanged. , A PBA prepolymer with a number average molecular weight of 9000, an intrinsic viscosity of 0.29 dL / g and an acid value of 21.8 mgKOH / g was obtained.

[0032] Use 100 parts (parts by weight) of the prepared PBA oligomer, 4.6 parts of 1,4-phenyl-bis(2-oxazoline), 0.023 parts of p-toluenesulfonic acid, and react at 200°C under normal pressure under the protection of nitrogen. After 3 hours, the number average molecular weight of the obtained polymer was 27,500.

Example Embodiment

[0033] Example 2: Using 100 parts by weight of the PBA oligomer (number average molecular weight of 9000), 5.0 parts of 1,4-phenyl-bis(2-oxazoline), 0.05 parts of p-toluene prepared in Example 1 Under the protection of sulfonic acid and nitrogen, the reaction was carried out at 200°C for 1.5 hours under normal pressure, and the intrinsic viscosity of the obtained polymer was 1.25dL / g.

Example Embodiment

[0034] Example 3: 100 parts by weight of PBA oligomer (number average molecular weight of 9000), 5.1 parts of 1,4-phenyl-bis(2-oxazoline), and 0.05 parts of p-toluene prepared in Example 1 Under the protection of sulfonic acid and nitrogen, the reaction was carried out at 180°C under normal pressure for 3 hours, and the number average molecular weight of the obtained polymer was 26,300.

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Abstract

The present invention is preparation process of biodegradable polyamidoester. Dibasic alcohol and dibasic acid are first melt polycondensated to prepare low molecular weight polyester pre-polymer with number average molecular weight of 2000-9700 or inherent viscosity below 0.5; and the low molecular weight polyester pre-polymer is then melt and chain expanded with binary fatty oxazoline or binary aromatic oxazoline in the presence of chain expander to prepare biodegradable polyamidoester with number average molecular weight up to 39 KD and inherent viscosity up to 1.25 dL/g.

Description

technical field [0001] The present invention relates to a preparation method of aliphatic polyester, in particular to a preparation method of biodegradable polyamide ester, in particular to a two-step method of polycondensation and chain extension to prepare a polyamide with a number average molecular weight of 2.0-39,000 and an intrinsic viscosity of 0.69 Process for high molecular weight biodegradable polyesteramides of ~1.25 dL / g. Background technique [0002] The preparation of aliphatic polyester by polycondensation and chain extension is a disclosed method. This method first prepares an aliphatic polyester prepolymer with a lower molecular weight or intrinsic viscosity by polycondensation, and then uses a chain extender to extend the chain. The prepolymer Structure, chain extender selection and chain extension method have a great impact on the reaction process and product quality of synthetic different products. Chain extender for chain extension to prepare high molec...

Claims

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Application Information

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IPC IPC(8): C08G63/91C08G63/78C08G63/80C08K5/353
Inventor 赵京波罗思扬杨万泰
Owner BEIJING UNIV OF CHEM TECH
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