Continuous preparation method of elastic copolyester
A copolyester and elastic technology, applied in the field of continuous preparation of elastic copolyester, can solve problems such as the decomposition of polyether macromolecules, and achieve the effects of stable molecular weight, excellent performance and stable performance
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[0028] Raw materials terephthalic acid and butanediol are added to the beating tank according to the proportioning ratio, and beating is carried out under stirring; after the titanium series catalyst (titanium glycolate) enters the preparation area, butanediol is added to dilute the catalyst concentration to 0.04wt%. After the preparation is completed, it is transported to the slurry preparation tank to participate in the preparation of the slurry.
[0029] The slurry is sent quantitatively and continuously into the vertical esterification reaction kettle with stirring by a gear pump, and is stirred at a temperature of 190°C under gauge pressure and normal pressure to carry out esterification to generate an intermediate bishydroxybutyl terephthalate, which is reacted to The esterification rate is at least 80%. The water generated in the esterification process is distilled out with the butanediol. After the water is separated by the fractionating tower, 99 wt% of the butanediol ...
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