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
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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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