Continuous production method for biodegradable aliphatic-aromatic copolyester
A biodegradable and aromatic technology, applied in the field of preparation of biodegradable materials, can solve the problems of great harm to the environment and human body, high esterification temperature, large amount of tetrahydrofuran generated, etc., and achieves excellent mechanical properties, improved heat resistance, Appearance quality effect
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Embodiment 1
[0052] A method for continuously producing biodegradable aliphatic-aromatic copolyesters, comprising the steps of:
[0053] (1) 25kg / h of terephthalic acid and 24kg / h of 1,4-butanediol are continuously added to the slurry preparation kettle, and the prepared slurry is continuously fed into the esterification reaction kettle , the flow of 1,4-butanediol from the bottom of the process tower is 18kg / h, and 0.2kg / h of n-butyl titanate is added at the same time, the pressure of the reactor is controlled to 40KPa (absolute pressure), and the temperature is 240°C , the residence time is 3 hours, the water, tetrahydrofuran and butanediol generated by the reaction are removed, and the obtained esterified product A1 is continuously extracted from the reactor. The repeating unit length of the obtained esterified product A1 is 2-5, and the terminal carboxyl group content is 200mol / t.
[0054] (2) 25kg / h of adipic acid, 18kg / h of 1,4-butanediol are continuously added in the slurry prepar...
Embodiment 2
[0059] A method for continuously producing biodegradable aliphatic-aromatic copolyesters, comprising the steps of:
[0060] (1) Add 800kg / h of terephthalic acid and 800kg / h of 1,4-butanediol continuously into the slurry preparation kettle, and the prepared slurry is continuously fed into the esterification reaction kettle , the flow of butanediol from the bottom of the process tower is 600kg / h, and 60kg / h of n-butyl titanate is added at the same time, the pressure of the reactor is controlled to 40KPa (absolute pressure), the temperature is 240°C, and the residence time is 2.5 hours , the water, tetrahydrofuran and butanediol produced by the reaction are removed, and the obtained esterified product A1 is continuously extracted from the reactor. The repeating unit length of the obtained esterified product A1 is 2-5, and the end group is 180mol / t.
[0061] (2) 700kg / h of adipic acid, 700kg / h of 1,4-butanediol are continuously added in the slurry preparation kettle, and the slurr...
Embodiment 3
[0066] A method for continuously producing biodegradable aliphatic-aromatic copolyesters, comprising the steps of:
[0067] (1) Add 30kg / h terephthalic acid and 30kg / h 1,4-butanediol continuously into the slurry preparation kettle, and the prepared slurry is continuously fed into the esterification reaction kettle , the flow of butanediol from the bottom of the process tower is 15kg / h, and 0.3kg / h of n-butyl titanate is added at the same time, the pressure of the control reactor is 60KPa (absolute pressure), the reaction temperature is 245°C, and the residence time After 3 hours, the water, tetrahydrofuran, and butanediol produced by the reaction were removed, and the obtained esterified product A1 was continuously extracted from the reactor. The repeating unit length of the obtained esterified product A1 was 2-5, and the end group was 170 mol / t.
[0068] (2) 30kg / h of sebacic acid, 30kg / h of 1,4-butanediol is continuously added in the slurry configuration still, and the slurr...
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