Method for preparing 2-methyl-1, 3-propanediol ester polyterephthalate and copolyester elastomer thereof
A technology of polyterephthalic acid and copolyester elastomer is applied in the field of preparation of copolyester elastomer, which can solve the problems of poor dimensional stability, application limitation, slow crystallization speed, etc., and achieve high resilience and small creep. Good effect of sex and transparency
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Embodiment 1
[0022] A kind of preparation method based on poly-2-methyl-1,3-trimethylene terephthalate and copolyester elastomer thereof, the method is a direct esterification method, comprising the following steps:
[0023] 415g of terephthalic acid (PTA), 360g of 2-methyl-1,3-propanediol and 0.5g of tetra-n-butyl titanate as catalyst for esterification were added into a 2L reaction kettle. After all the materials are added, fill with nitrogen and deflate to remove the oxygen in the reaction kettle. Then fill with nitrogen to increase the pressure in the kettle to 0.15MPa, start heating, and react at 235° C. for 3 hours until the total amount of distilled water reaches more than 90% of the theoretical value. Slowly lower the pressure in the kettle to normal pressure, add 367 g of polyethylene glycol with a molecular weight of 2000 into the reaction kettle, and keep the temperature at 230°C for 0.75h. Then add 0.8g of triphenyl phosphite and 0.6g of antimony trioxide, vacuum polycondensat...
Embodiment 2
[0025] A kind of preparation method based on poly-2-methyl-1,3-trimethylene terephthalate and copolyester elastomer thereof, the method is a direct esterification method, comprising the following steps:
[0026] 332g of terephthalic acid (PTA), 84g of isophthalic acid, 270g of 2-methyl-1,3-propanediol, 62g of ethylene glycol and esterification catalyst 0.4g tetraisopropyl titanate, 0.2g Magnesium acetate was added to the 2L reaction kettle. , After all the materials are added, fill with nitrogen and deflate to remove the oxygen in the reaction vessel. Nitrogen was added to increase the pressure in the kettle to 0.2 MPa, and the mixture was stirred at 240° C. for 3 h. During this process, water was distilled from the reaction mixture as a by-product in a yield of 91.6%. Reduce the pressure in the kettle to normal pressure, add 62g of polyethylene glycol with a molecular weight of 4000, and 62g of polypropylene glycol with a molecular weight of 2000, and keep the temperature a...
Embodiment 3
[0028] A kind of preparation method based on poly(2-methyl-1,3-propylene glycol terephthalate) and copolyester elastomer thereof, the method is a transesterification method, comprising the following steps:
[0029] Add 58g of dimethyl terephthalate (DMT), 59g of 2-methyl-1,3-propanediol and 0.06g of zinc acetate dihydrate into a three-necked flask equipped with a mechanical stirring device. After all the materials were added, equip the flask with a condensation device, vacuumize and fill with nitrogen three times to remove the oxygen in the reaction vessel. The transesterification reaction was stirred at 195°C for 3.5h. During this process, methanol was distilled off from the reaction mixture as a by-product in a yield of 98%. Add 22 g of polyethylene glycol with a molecular weight of 2000, and stir at 195° C. for 0.75 h. 0.045g of tetrabutyl titanate and 0.09g of triphenyl phosphite were added to the reaction mixture as a polycondensation catalyst and heat stabilizer respec...
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