Degradable copolyester as well as preparation method and application thereof

A technology of copolyester and polyester, applied in the field of degradable polymer materials, can solve the problems of high cost, low molecular weight, poor mechanical properties and efficient biodegradation of polyester, and achieve high molecular weight, simple method, excellent mechanical strength and The effect of toughness

Active Publication Date: 2021-08-27
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] To sum up, although the existing technology provides a series of solutions, the prepared polyester still has high cost, low molecular weight, poor mechanical properties, and cannot be simultaneously Problems such as efficient biodegradation in soil and natural water bodies, especially seawater

Method used

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  • Degradable copolyester as well as preparation method and application thereof
  • Degradable copolyester as well as preparation method and application thereof
  • Degradable copolyester as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0078] The invention provides a kind of preparation method of copolyester, comprises the steps:

[0079] Mixing the dibasic acid, dibasic alcohol and lactic acid monomers used to form the segment of the difficult-to-hydrolyze polyester, in the presence of a catalyst, temperature programming, esterification and polycondensation to obtain the copolyester;

[0080] or

[0081] The dibasic acid, dibasic alcohol or the lactic acid monomer used to form the segment of the difficult-to-hydrolyze polyester is programmed to increase the temperature in the presence of a catalyst, and firstly undergo esterification and polycondensation to obtain a low-molecular-weight segment that is difficult to hydrolyze permanent polyester or low molecular weight polylactic acid fragments;

[0082] Adding the above-mentioned low-molecular-weight segments of difficult-to-hydrolyzable polyester or low-molecular-weight polylactic acid during the esterification and polycondensation process of polylactic a...

Embodiment 1

[0114] A kind of degradable copolyester, its preparation method comprises the steps:

[0115] 10mol of 1,4-butanedioic acid, 15mol of 1,4-butanediol (excess), 1-7mol of lactic acid, tetraisopropyl titanate, stannous chloride, and 0.85-1.2g of composite catalyst composed of triethyl phosphate , starting at 150°C, the temperature is raised by 10°C every 10 minutes until it reaches 180°C, and the esterification is completed after no more water is released, and 3.5-5g of composite catalyst is added, vacuumized, and the temperature is raised by 10°C every 10 minutes to 230°C, and the reaction temperature is controlled at Continue the reaction at 230°C for 1 hour, add 1.5-3 g of catalyst, and continue the reaction for 1.5 hours to obtain random copolyesters PBSLA10, PBSLA20, PBSLA30, PBSLA40, PBSLA50, PBSLA60, and PBSLA70. The relevant data are shown in Table 1:

[0116] The copolyester prepared in Example 1 has the following molecular formula, and its basic properties are shown in...

Embodiment 2

[0122]A kind of degradable copolyester, its preparation method comprises the steps:

[0123] 10 mol of 1,4-butanedioic acid, 15 mol of 1,4-butanediol (excess), 0.5 mol of lactic acid, 160-180 °C temperature-programmed esterification for 2 hours, adding catalyst tetraisopropyl titanate 5.5 g, 2-ethyl Stannous hexanoate, 0.3 g, 200-230 ° C temperature programmed high vacuum polycondensation for 4.5 h to obtain random copolyester PBSLA5, its structural formula is the same as in Example 1.

[0124] In the formula x=120, p=60; The M of this random copolyester n =46200g / moL, tensile strength 42MPa, elongation at break 430%, melting point 105°C.

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Abstract

The invention discloses a degradable copolyester which is a random copolymer or a double-block copolymer composed of difficult-to-hydrolyze polyester fragments and easy-to-hydrolyze fragments or sites, wherein the number-average molecular weight of the copolyester is 30000 g/moL to 500000 g/moL; and the easy-to-hydrolyze fragments or sites are selected from polylactic acid with different chain segment lengths. The copolyester is high in molecular weight, free of environment-unfriendly chain extenders, good in mechanical strength and toughness, resistant to heat and good in processability, and can be independently used as plastic. In various natural environments such as water, soil, compost and the like, the copolyester can be completely degraded in the natural environments to form environment-pollution-free carbon dioxide and water. The invention also discloses a preparation method and application of the degradable copolyester.

Description

technical field [0001] The invention relates to the field of degradable polymer materials. More specifically, it relates to a degradable copolyester and its preparation method and application. Background technique [0002] The increasingly severe marine plastic pollution and its harm to marine ecology and human life have attracted widespread attention. In the long run, the development and use of degradable plastic products in seawater to replace general-purpose refractory plastic products is a fundamental and effective way to prevent this problem from continuing to develop. Among all polymer materials, polyester is particularly susceptible to biodegradation by the action of water and microorganisms in the environment due to the presence of ester bonds in the chain segment, and produces environmentally friendly carbon dioxide and water. This process usually goes through three steps: 1) the material is broken under the combined action of light, oxygen, water, and biology; 2)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/60C08G63/78C08G63/83C08G63/85C08L67/00
CPCC08G63/60C08G63/78C08G63/85C08G63/83C08L67/00C08L2201/06Y02W90/10
Inventor 王格侠季君晖刘田园甄志超卢波
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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