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A preparing method of low-melting point polyester used for manufacturing terylene sewing threads

A low-melting polyester and sewing thread technology, applied in the direction of adhesives, etc., can solve the problems of unsuitable polyester foreign sewing thread, uneven color of sewing thread, poor solubility, etc., and achieves good industrial application prospects, low intrinsic viscosity, low cost effect

Inactive Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The low-melting-point polyester produced by the prior art has poor solubility when used in the production of adhesives for solvent-based Bondi threads, and the dissolved adhesive of the low-melting-point polyester is coated on the outer layer of polyester sewing thread and dried in the air. The surface of the rear sewing thread is prone to whitening, which makes the color of the sewing thread uneven and affects the appearance, so it is not suitable for the outer layer adhesive of polyester foreign sewing thread

Method used

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  • A preparing method of low-melting point polyester used for manufacturing terylene sewing threads
  • A preparing method of low-melting point polyester used for manufacturing terylene sewing threads

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Embodiment 1～3

[0026] 1) Using terephthalic acid, ethylene glycol, isophthalic acid, and straight-chain monomers with dihydroxyl reactive functional groups other than ethylene glycol as reaction materials, carry out esterification reaction at a temperature of 240-270°C, The esterification pressure is 20-50kPa, the molar ratio of raw materials is (terephthalic acid + simple dicarboxylic acid): (ethylene glycol + linear monomer with dihydroxy reactive functional groups) = 1: 1.1-1.8, and the reaction to ester The conversion rate is not less than 92%, and the generated water is removed during the reaction process;

[0027] 2) The esterification product intermediate is further esterified and precondensed in the presence of a polycondensation catalyst, under a negative pressure of 2-10kpa, and a reaction temperature of 260-285°C to obtain a polyester oligomer with a certain degree of polymerization. The reaction time is 1.5-2.5 hours; then under the vacuum condition of negative pressure 0.1-2KPa,...

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Abstract

The invention relates to a preparing method of low-melting point polyester used for manufacturing terylene sewing threads. The method includes: 1) performing esterification by adopting terephthalic acid, ethylene glycol, isophthalic acid, and a straight-chain monomer having double hydroxyl reaction functional groups except the ethylene glycol; and 2) under the existence of a condensation polymerization catalyst, performing further esterification and pre-condensation polymerization, and performing condensation polymerization under a vacuum condition of 0.1-2 KPa. The melting point and the intrinsic viscosity of a polyester product prepared by the method are lower than that of conventional polyester. Compared with present low-melting point polyester, the intrinsic viscosity and the crystallization property of the product prepared by the method are low, and dissolution performance when the product is used for producing an adhesive used for solvent type bonded threads is good.

Description

technical field [0001] The invention relates to a preparation method of a low-melting-point polyester, in particular to a preparation method of a low-melting-point polyester used for the outer layer adhesive of polyester sewing thread. Background technique [0002] Polyester sewing thread is made of polyester filament or polyester staple fiber. It has high strength, wear resistance, low shrinkage, and good chemical stability. It can be used to sew various clothing materials, shoes, bags, toys, etc. and other auxiliary materials. It is the most widely used and popular sewing thread at present; polyester sewing thread has dual functions of practicality and decoration, and its quality not only affects the sewing effect and processing cost, but also affects the appearance quality of the finished product. Generally, polyester sewing thread is made of two or more yarns or filaments twisted together. The tightness and evenness of multi-strand threads are determined by the twisting ...

Claims

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Application Information

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IPC IPC(8): C08G63/672C08G63/86C09J167/02
Inventor 林永明王雁吴一平董艳王伟谭晓玲朱金芳
Owner CHINA PETROLEUM & CHEM CORP
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