Degradable copolyester as well as preparation method and application thereof

A technology of copolyester and polyester, which is applied in the field of degradable polymer materials, can solve the problems of high cost, low molecular weight, poor mechanical properties and high-efficiency biodegradation of polyester, and achieve reduction of synthesis steps, simple method, and accelerated degradation rate Effect

Inactive 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
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Effect test

preparation example Construction

[0079] The invention provides a kind of preparation method of copolyester, comprises the steps:

[0080] 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;

[0081] or

[0082] 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;

[0083] 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

[0117]10mol terephthalic acid, 1,4-butanediol (excess) 15mol, 2-10mol lactic acid, tetrabutyl titanate, stannous chloride, triethyl phosphate composite catalyst 0.85-1.2g, start at 180°C Raise the temperature by 10°C every 10 minutes, until it reaches 230°C, stop the esterification after no more water, add 3.5-5g of composite catalyst, vacuumize, raise the temperature by 10°C every 10 minutes, program the temperature to 250°C, control the reaction temperature at 250°C to continue the reaction After 1 hour, 1.5-3g of catalyst was added, and the reaction was continued for 1.5h to obtain random copolyesters PBTLA20, PBTLA40, PBTLA60, PBTLA80, PBTLA100, and the NMR spectra of the obtained PBTL series polymers were as follows: figure 1 As shown, the relevant data are shown in Table 1:

[0118]

[0119] Table 1

[0120]

Embodiment 2

[0122] 10 mol of terephthalic acid, 13 mol of ethylene glycol (excess), 2-8 mol of lactic acid, tetrabutyl titanate, stannous chloride, and 0.85-1.2 g of composite catalyst composed of triethyl phosphate, starting at 180°C, heating up 10 minutes per 10 minutes ℃, until it rises to 230 ℃, the esterification is finished after no more water is released, add 3.5-5g of composite catalyst, vacuumize, increase the temperature by 10 ℃ every 10min, program the temperature to 260 ℃, control the reaction temperature at 260 ℃ and continue the reaction for 1 hour, supplement Add 1.5-3g of catalyst and continue the reaction for 1.5h to obtain random copolyester PETLA20, PETLA40, PETLA60, PETLA80, PETLA100. The relevant data are shown in Table 2:

[0123]

[0124] Table 2

[0125]

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Abstract

The invention discloses a degradable copolyester which is a random copolymer or a double-block copolymer composed of polyester fragments which are difficult to hydrolyze and fragments or sites which are easy to hydrolyze, wherein the number-average molecular weight of the copolyester is 30000 g / mol to 500000 g / mol; and the fragments or sites which are easy to hydrolyze 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 degradation 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) th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/60
CPCC08G63/60
Inventor 王格侠季君晖能文博卢波甄志超
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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