Hydrolyzablecopolyester and preparation method and application thereof

A technology of copolyester and polyester, applied in the field of degradable polymer materials, can solve the problems of difficult removal, high cost, and low molecular weight of the product, and achieve the effect of excellent processing performance and good water degradation performance

Inactive Publication Date: 2019-05-17
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

Involving the synthesis process of PGA and PLGA, most of them are obtained by ring-opening polymerization using expensive lactide and glycolide as raw materials, which makes it difficult to implement the material in the specific application process due to the high cost of raw materials; the prior art also introduces the synthesis of PBA first , low molecular weight poly

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  • Hydrolyzablecopolyester and preparation method and application thereof
  • Hydrolyzablecopolyester and preparation method and application thereof
  • Hydrolyzablecopolyester and preparation method and application thereof

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preparation example Construction

[0068] Yet another embodiment of the present invention provides the preparation method of above-mentioned hydrolyzable copolyester, in one scheme, this preparation method comprises the steps:

[0069] Mixing the dibasic acid and dibasic alcohol used to form the chain segment of the difficult hydrolyzable polyester and the monomer of the easily hydrolyzable polyester, esterification and polycondensation in the presence of a catalyst to obtain the copolymerization ester, the copolymer at this time is a random copolymer.

[0070] It can be understood that the above-mentioned dibasic acid and dibasic alcohol forming the chain segment of the difficult hydrolyzable polyester can be exemplified as, when the difficultly hydrolyzable polyester is PBS, the dibasic acid forming PBS is 1,4- Succinic acid, the diol is 1,4-butanediol, and the content of 1,4-butanediol is 1-2 times the molar content of 1,4-butanedioic acid. At this time, the monomer of easily hydrolyzable polyester The mola...

Embodiment 1

[0095] A kind of preparation method of hydrolyzable copolyester, comprises the steps:

[0096] 10mol of 1,4-butanedioic acid, 15mol of 1,4-butanediol (excess), 1mol of glycolic acid, after esterification at 160-180°C for 2 hours, add catalyst tetrabutyl titanate 6.5g, high vacuum at 200-230°C Polycondensation 4h to obtain random copolyester PGBS1, its structural formula is as shown in the following formula:

[0097]

[0098] After determination, the M of the random copolyester n =49600, tensile strength 35MPa, elongation at break 120%, melting point 105°C, nuclear magnetic spectrum as figure 1 shown. It takes 4 months for the molecular weight to drop to 1 / 10 of the original in distilled water at 40°C. In natural seawater, it loses 70% of its weight in one year. The copolyester can be processed into disposable tableware such as knives, forks and spoons through injection molding or blister processing.

Embodiment 2

[0103] A kind of preparation method of hydrolyzable copolyester, comprises the steps:

[0104] 10mol of 1,4-butanedioic acid, 15mol of 1,4-butanediol (excess), 1mol of glycolide, after esterification at 160-180°C for 2h, add catalyst tetraisopropyl titanate 5.5g, stannous chloride 0.3g, high vacuum polycondensation at 200-230°C for 4.5h to obtain random copolyester PGBS2, whose structural formula is as follows:

[0105]

[0106] After determination, the M of the random copolyester n =50200, tensile strength 34MPa, elongation at break 130%, melting point 105°C. Its NMR spectrum is as image 3 As shown, it takes 4 months for the molecular weight to drop to 1 / 10 of the original in distilled water at 40°C. In natural seawater, it loses 70% of its weight in one year. The copolyester can be processed into various pipes by twin-screw extrusion.

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Abstract

The invention discloses a hydrolyzablecopolyester. A molecular chain segment of the hydrolyzablecopolyester comprises a chain segment of a polyester difficult to hydrolyze and a chain segment of a hydrolyzable polyester body, and the hydrolyzablecopolyester is a random copolymer or a block copolymer composed of the chain segment of the polyester difficult to hydrolyze and the chain segment of thehydrolyzable polyester. The hydrolyzablecopolyester has good strength and toughness, meanwhile, is biodegradable, and can be degraded rapidly in the natural water environment. The invention further discloses a preparation method and application of the hydrolyzablecopolyester.

Description

technical field [0001] The invention relates to the field of degradable polymer materials. More specifically, it relates to a hydrolyzable copolyester and its preparation method and application. Background technique [0002] Biodegradable plastics are a class of aliphatic polyesters or copolyesters. Not only has the thermal, mechanical properties and processing properties comparable to general-purpose plastics, but compared with olefin and amide polymer materials, its ester bond is more likely to be broken by water, oxygen and microorganisms, and has special biodegradation properties. Microbial enzymatic degradation can occur after composting or placing in the soil for several months, and it can be completely decomposed into CO 2 and water. After more than 20 years of development, from the first generation of hydroxyalkanoates (PHAs) to the second generation of polylactic acid (PLA), to the third generation of polybutylene succinate (PBS) and its copolymer polypara Copol...

Claims

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Application Information

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IPC IPC(8): C08G63/06C08G63/16C08G63/60C08G63/85
CPCC08G63/06C08G63/16C08G63/60C08G63/85
Inventor 王格侠季君晖黄丹
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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