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

Inactive Publication Date: 2017-03-08
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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Problems solved by technology

[0005] In order to overcome the problem of polyether macromolecule decomposition during the polyester modification process, the purpose of the present invention is to provide a continuous preparation method of elastic copolyester, through which the modified polyether with uniform distribution and stable molecular weight can be obtained. Polyester

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  • Continuous preparation method of elastic copolyester

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Embodiment

[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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Abstract

The invention discloses a continuous preparation method of an elastic copolyester. The continuous preparation method comprises the following steps: firstly, mixing a butanediol solution of a titanium catalyst, terephthalic acid and butanediol so as to prepare slurry, and performing a primary esterification reaction; secondly, mixing a polyether butanediol solution with the obtained intermediate namely bishydroxybutyl terephthalate, and performing a secondary esterification reaction and a pre-polymerization reaction; and finally performing a condensation polymerization reaction, thereby obtaining the elastic copolyester. By adopting the continuous preparation method disclosed by the invention, the elastic copolyester which is excellent and stable in product ductility can be prepared, and the problems that polyether macromolecules can be easily subjected to thermal degradation in the reaction process, particularly under the conditions of high temperature and relatively long reaction time, the polyether macromolecules can be decomposed into chain segments of a low molecular weight, and furthermore the modification function of generated polyether can be degraded, can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a continuous preparation method of elastic copolyester. Background technique [0002] Thermoplastic polyester elastomer (TPEE), also known as polyester rubber, is a block linear copolymer containing PBT polyester hard segment (crystalline phase, providing strength) and polyether soft segment (continuous segment). The rigidity, polarity and crystallinity of the hard segment of thermoplastic polyester elastomer make it have outstanding strength and good high temperature resistance, creep resistance, solvent resistance and impact resistance; low vitrification of polyether soft segment Temperature and saturation make it have excellent low temperature resistance and aging resistance. Thermoplastic polyester elastomers combine the excellent elasticity of rubber with the ease of processing of thermoplastics. [0003] Compared with other thermoplastic elastomers, thermoplasti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672
Inventor 张晓静沈伟朱刚吴一平金永龙董艳王伟
Owner CHINA PETROLEUM & CHEM CORP
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