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
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[0025] Examples 1~3
[0026] 1) Using terephthalic acid, ethylene glycol, isophthalic acid, and linear monomers with dihydroxy reactive functional groups other than ethylene glycol as reaction raw materials, the esterification reaction is carried out at a temperature of 240-270°C, Esterification pressure is 20-50kPa, and the molar ratio of raw materials is (terephthalic acid + simple dicarboxylic acid): (ethylene glycol + linear monomer with dihydroxy reactive functional group) = 1: 1.1 ~ 1.8, react to ester The conversion rate is not less than 92%, and the water generated during the reaction is removed;
[0027] 2) In the presence of a polycondensation catalyst, the esterification product intermediate is subjected to further esterification and pre-polycondensation at a negative pressure of 2-10kpa and a reaction temperature of 260-285℃ 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 ne...
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