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Preparation method of polyester for making high modulus and low shrinkage type industrial yarns

A low-shrinkage, industrial yarn technology, applied in the field of polyester manufacturing, can solve the problem that polyester cannot meet the application requirements of high-modulus and low-shrinkage industrial yarns, and achieves improved yield and performance, good purity, and good spinnability. sexual effect

Active Publication Date: 2014-10-15
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 making high modulus and low shrinkage type industrial yarns

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Embodiment 1～8

[0017] The esterification reaction of terephthalic acid and ethylene glycol is carried out 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 generated, and the reaction is carried out until the esterification rate is at least 92%, and the generated water is removed during the reaction.

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

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

[0020] The control of the mixed catalyst system used in the polycondensation reaction ...

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Abstract

A preparation method of polyester for making high modulus and low shrinkage type industrial yarns comprises the following steps: carrying out an esterification reaction on terephthalic acid and ethylene glycol at 250-290DEG C to generate an intermediate ethylene glycol terephthalate until the esterification rate is at least 92%, and removing generated water in the reaction process; and carrying out a condensation polymerization reaction on the intermediate ethylene glycol terephthalate under a negative pressure in the presence of an antimony and titanium mixed catalyst system comprising a liquid titanium catalyst and ethylene glycol antimony at 270-300 DEG C for 2-3h. The polyester prepared in the invention has the characteristics of high viscosity, low diglycol content, high carboxyl end group content, high purity and good spinnability, and the production rate and the performances of the high modulus and low shrinkage type industrial yarns made by using polyester are obviously 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 type industrial yarns by using terephthalic acid and ethylene glycol as monomers. The system uses a mixture of antimony and titanium. type catalyst. Background technique [0002] As the raw material of textile fibers, polyester materials can be spun into polyester filaments and polyester staple fibers. Polyester filament is divided into civilian polyester filament and industrial polyester filament. Polyester industrial yarn refers to polyester filament with high strength and coarse denier, and its fineness is not less than 550dtex. According to its performance, it can be divided into high-strength and low-stretch type (common standard type), high-modulus and low-shrinkage type, high-strength and low-shrinkage type, and active type. Among them, the high modulus and low shrinkage polyester industrial yarn has ...

Claims

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Application Information

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Patent Type & Authority Applications(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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