Copolyester and preparation method thereof

A technology of polyester and citramalic acid-based polyester is applied in the field of polyester and its preparation, which can solve the problems of high production cost, long synthesis process and high cost, and achieve the advantages of enhanced environmental protection awareness, stable chemical properties and excellent mechanical properties. Effect

Active Publication Date: 2021-08-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this patent improves the toughness of PBS, this composite material needs to add non-ionic surfactants, compatibilizers, etc., which is costly and increases environmental pollution.
[0005] Chinese patent CN201711483816.4 uses baseless metal salts and ionic liquids to prepare composite plasticizers, and uses the composite plasticizers to prepare PBS / starch blends, which can improve toughness, but the elongation at break is only 12-20 %
However, the polymer monomer synthesis process used in this patent is relatively long, and the production cost is relatively high. In addition, in the case of 10% butadiene oxabicyclic ester copolymerization, although the toughness can be improved, the elongation at break is about 450%, but the tensile Significantly lower strength
Inability to balance strength and toughness at the same time

Method used

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  • Copolyester and preparation method thereof
  • Copolyester and preparation method thereof
  • Copolyester and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Weigh 0.74g citramalic acid, 11.21g succinic acid, 22.53g 1,4-butanediol, 0.17g tetrabutyl titanate, add these materials into a 100ml three-necked flask, and fill the reaction system with nitrogen Protective gas, start stirring (speed: 80r / min), turn on the oil bath and heat to 160°C for 1h esterification, 180°C for 5h, stop filling nitrogen, turn on the vacuum pump to evacuate the reaction system to 100Pa, heat up to 200°C, When the reaction system reaches 200°C, start timing and polycondensate for 3.5 hours. After the reaction, stop the vacuum pump, take out the polyester, and record it as polymer P(BS95-co-BC5). The samples were characterized by tests such as molecular weight, glass transition temperature Tg, water resistance, and elongation at break.

Embodiment 2

[0047] Weigh different citric malic acid and succinic acid as follows:

[0048] 1) Weigh 1.48g citric acid, 10.62g succinic acid;

[0049] 2) Weigh 2.22g citric malic acid, 10.03g succinic acid;

[0050] 3) Weigh 4.44g citric malic acid, 8.26g succinic acid;

[0051] 4) Weigh 5.92g citric acid, 7.08g succinic acid;

[0052] 5) Weigh 11.84g citric malic acid, 2.36g succinic acid;

[0053] The amount of 1,4-butanediol and the synthetic method of polyester are the same as in Example 1, and the prepared polymers are respectively denoted as polymers P(BS90-co-BC10), P(BS85-co-BC15), P(BS70- co-BC30), P(BS60-co-BC40), P(BS20-co-BC80).

Embodiment 3

[0055] Weigh 15.52 g of ethylene glycol, the dosage of citramalic acid and succinic acid and the synthetic method of polyester are the same as in Example 1, and it is recorded as polymer P (ES95-co-EC5).

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Abstract

The invention relates to citramalic acid-based polyester and a preparation method thereof, in particular to a method for obtaining copolyester with excellent performance through polycondensation of dicarboxylic acid compounds citramalic acid, succinic acid and saturated straight-chain dihydroxy compounds such as butanediol. The copolyester is synthesized under the conditions that the melt polycondensation temperature is 180-230 DEG C, the polycondensation time is 0.5-5 hours and the polycondensation vacuum degree is 100-2000 Pa. Compared with polybutylene succinate (PBS) without citramalic acid, the synthesized polyester has excellent properties such as high toughness, high barrier property and rapid degradability, and has the remarkable advantages of good practicability, good application prospect and the like.

Description

technical field [0001] The present invention relates to a kind of polyester and its preparation method. Specifically, dicarboxylic acid compound citramalic acid, succinic acid, and dihydroxy compound butanediol are polycondensed to obtain polyester with high toughness, high barrier property and hydrophilic property. A method for copolyesters with excellent properties such as rapid degradability. Background technique [0002] Due to the characteristics of light weight, stable chemical properties, corrosion resistance, and good impact resistance, plastics are used as basic materials in people's lives. However, due to the long degradation time (200-300 years) of commonly used plastics such as polyethylene and polypropylene in the soil environment, their accumulation will cause great harm to the environment. With the increasingly serious white pollution problem, the enhancement of environmental protection awareness and the strategic requirements of sustainable economic developm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/60C08G63/85
CPCC08G63/60C08G63/85
Inventor 郑明远宋蕾周光远周茉姜宇王瑞姜敏张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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