Manufacturing method of low melting point polyester

A low-melting-point polyester and manufacturing method technology, applied in the field of manufacturing low-melting-point polyester, can solve problems such as serious side reactions in the esterification process, high tetrahydrofuran, and affecting product performance

Active Publication Date: 2005-05-25
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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  • Abstract
  • Description
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Problems solved by technology

The defect of this existing LPET manufacturing method is that the side reactions in the esterification process are relatively serious, and the ratio of 1,4-butanediol in the raw material to generate tetrahydrofuran through side reactions is very high, which will affect the esterification rate and make each product in the product The ratio of monomers deviates from the expected ratio, which affects the performance of the product

Method used

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  • Manufacturing method of low melting point polyester

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Experimental program
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Embodiment 1～8

[0027] A rectification column condenser and collector, a nitrogen pressurization system, a vacuum system, a heating device and a stirring device are arranged on a 2-liter stainless steel reactor.

[0028] Weigh ethylene glycol (EG) and 1,4-butanediol (BD) according to the required molar ratio, weigh the required amount of catalyst tetrabutyl titanate and dissolve them, add the materials to the reaction kettle, and start stirring , the material is heated to the desired temperature. Then weigh terephthalic acid (PTA) and isophthalic acid (IPA) according to the required molar ratio and add them to the reactor. Fill the reaction kettle with nitrogen, replace the air in the kettle twice, open the rectification column valve, control the required reaction temperature and reaction pressure, and first carry out the first stage of esterification reaction.

[0029] After the esterification reaction of the first stage is finished, the rectifying column valve is closed, nitrogen is filled...

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Abstract

A process for preparing a polyester with low smelting point includes catalytic esterifying reaction between terephthalic acid, meta-phenyldiformic acid, ethanediol and 1,4-butanediol by two stages: at 160-200 deg.C under 0.05 MPa for 1-3 hr and at 220-250 deg.C under 0.15-0.3 MPa for 1-3 hr, and catalytic polycondensation reaction in negative pressure condition. Its smelting point is 100-200 deg.C.

Description

technical field [0001] The invention relates to a low-melting-point polyester produced by using terephthalic acid, isophthalic acid, ethylene glycol and 1,4-butanediol as monomers through esterification reaction and polycondensation reaction. Background technique [0002] Low melting point polyester (LPET) is a polymer with good compatibility with most fiber-forming polymers. The monomers are generally terephthalic acid, isophthalic acid or adipic acid, ethylene glycol and 1,4 - butanediol. The melting point of LPET is 80-200°C. It can be used to make polyester hot-melt adhesive products, and can be used with other fiber-forming polymers to make skin-core composite fibers and non-woven fabrics. In addition, LPET and other chemical fibers are easy to glue and have high peel strength, so they can be used as raw materials for making high-grade adhesive linings. [0003] In the prior art, LPET is manufactured using basically the same process as that of ordinary polyester (PET)...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/78C08G63/85
Inventor 姚峰林生兵瞿中凯金永龙郭永林
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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