Preparation method of polyadipic acid-butylene terephthalate with high molecular weight
A technology of butylene phthalate and terephthalic acid is applied in the field of preparation of high molecular weight polyadipate-butylene terephthalate, and can solve the problems of high temperature instability of melt, low catalytic efficiency, The problem of high cost is to achieve the effect of narrow molecular weight distribution, high catalytic efficiency and improved heat resistance.
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[0018] Example 1
[0019] Put 136g of butanediol, 80g of adipic acid and 75g of terephthalic acid into the reactor, stir evenly, add composite catalyst 0.058g MgO and 0.29g bistriethanolamine diisopropyl titanate, at a temperature of 180℃ The esterification was carried out under normal pressure and the constant temperature reaction was 2.3 hours. Then, the temperature was raised to 220°C, 0.087g of stabilizer polycarbodiimide was added, and the pressure was reduced to 30 Pa for polycondensation reaction, and the reaction was carried out for 3 hours. The molecular weight of the obtained polybutylene adipate-terephthalate was 9.4× 10 4 , The molecular weight distribution is 1.62, the tensile strength is 18.21MPa, the elongation at break is 743%, the L value is 82, and the acid value is 18.6mol / t.
Example Embodiment
[0020] Example 2
[0021] Put 180g butanediol, 102g adipic acid and 50g terephthalic acid into the reactor, stir evenly, add 0.166g Al of composite catalyst 2 O 3 And 2.65 g of bis(ethyl acetoacetate) diisopropyl titanate, esterification under normal pressure at a temperature of 230°C, and constant temperature reaction for 1.5 hours. Then, the temperature was raised to 250°C, 0.332g of stabilizer dicyclohexylcarbodiimide was added, and the pressure was reduced to 50 Pa for polycondensation reaction, and the reaction was carried out for 3.5 hours. The molecular weight of the obtained polybutylene adipate-terephthalate was 15.2×10 4 , The molecular weight distribution is 1.87, the tensile strength is 17.42MPa, the elongation at break is 795%, the L value is 81, and the acid value is 20.2mol / t.
Example Embodiment
[0022] Example 3
[0023] Put 92g butanediol, 88g adipic acid and 66g terephthalic acid into the reactor, stir evenly, add 0.025g Li of composite catalyst 2 O and 1.23 g of tetraethyl titanate were esterified under normal pressure at a temperature of 215°C and reacted at a constant temperature for 2 hours. Then, the temperature was raised to 230°C, 0.123g of stabilizer polycarbodiimide was added, and the pressure was reduced to 80 Pa for polycondensation reaction. The reaction was carried out for 2.5 hours. The molecular weight of the obtained polybutylene adipate-terephthalate was 11.9× 10 4 , The molecular weight distribution is 1.57, the tensile strength is 20.91MPa, the elongation at break is 602%, the L value is 85, and the acid value is 16.7 mol / t.
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