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Preparation method of polyester for manufacturing high-modulus low-shrinkage industrial yarn

A low-shrinkage, industrial yarn technology, applied in the field of polyester manufacturing, can solve the problems that polyester cannot meet the application requirements of high-modulus and low-shrinkage industrial yarns, and achieve the production rate and performance improvement, good purity, and high viscosity. Effect

Active Publication Date: 2017-06-27
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] The invention provides a method for preparing polyester for high-modulus and low-shrinkage industrial yarns. It uses an antimony-titanium mixed catalyst to solve the technical problem that polyesters prepared by using antimony-based catalysts cannot achieve Application Requirements of High Modulus and Low Shrinkage Industrial Yarn

Method used

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  • Preparation method of polyester for manufacturing high-modulus low-shrinkage industrial yarn

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Embodiment 1～8

[0017] Terephthalic acid and ethylene glycol undergo esterification reaction at a temperature of 250-290 ° C, and the molar ratio of raw materials is terephthalic acid: ethylene glycol = 1: (1.1-1.5). The intermediate bishydroxyethyl terephthalate is produced, reacted until the esterification rate is at least 92%, and the generated water is removed during the reaction.

[0018] In the presence of a mixed catalyst system, the intermediate bishydroxyethyl terephthalate undergoes polycondensation reaction under negative pressure (2000-100Pa) to obtain polyester products. The polycondensation reaction temperature is 270-300°C and the reaction time is 2 ~3 hours.

[0019] After the selected mixed catalyst enters the preparation area, add ethylene glycol (hereinafter referred to as: EG) to dilute the catalyst concentration to 2wt%.

[0020] The mixed catalyst system control used in the polycondensation reaction of each embodiment and the main quality indicators of polyester product...

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Abstract

A preparation method for producing high-modulus low-shrinkage polyester for industrial yarns, including the process: terephthalic acid and ethylene glycol undergo esterification reaction at a temperature of 250-290°C to generate the intermediate terephthalic acid bis Hydroxyethyl ester, react until the esterification rate is at least 92%, remove the generated water during the reaction; the intermediate bishydroxyethyl terephthalate is in the antimony-titanium mixed catalyst system composed of liquid titanium catalyst and ethylene glycol antimony In the presence of the presence of the polycondensation reaction under negative pressure conditions; polycondensation reaction temperature is 270 ~ 300 ° C, the reaction time is 2 to 3 hours. The polyester product obtained by the invention has higher intrinsic viscosity, lower content of diethylene glycol, higher content of terminal carboxyl group, better purity of polyester, better spinnability, and high-modulus low-shrinkage industrial yarn. Manufacturability and performance are also significantly improved.

Description

technical field [0001] The invention relates to a method for producing polyester, in particular to a method for producing polyester for high modulus and low shrinkage industrial yarns using terephthalic acid and ethylene glycol as monomers. The system uses an antimony-titanium blend type catalyst. Background technique [0002] Polyester materials are used as raw materials for textile fibers, and can be spun into polyester filaments and polyester staple fibers. Polyester filament is divided into civil polyester filament and industrial polyester filament. Polyester industrial yarn refers to high-strength, coarse-denier polyester filament with a denier of not less than 550dtex. According to its performance, it can be divided into high-strength and low-stretch type (ordinary standard type), high-modulus low-shrinkage type, high-strength low-shrinkage type, and active type. Among them, high-modulus low-shrinkage polyester industrial yarn has a tendency to gradually replace ord...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/183C08G63/85C08G63/86
Inventor 林永明沈伟周芬陆惠辉马学明吴一平严少华钱军赵伟康
Owner CHINA PETROLEUM & CHEM CORP
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