Preparation method of polybutylene terephthalate/adipate butanediol copolyester

A technology of polybutylene terephthalate and butylene diacid copolyester, applied in the field of polyester synthesis, can solve problems such as adverse effects on product quality, and achieve shortened synthesis reaction time, high intrinsic viscosity and catalytic activity high effect
CN101864068AActive Publication Date: 2010-10-20PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2010-10-20

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Abstract

The invention relates to a preparation method of polybutylene terephthalate / adipate butanediol copolyester, which utilizes a titanium compound and an antimony compound as the composite catalyst, the mole ratio of terephthalic acid to adipate is 3:7-8:2, the ratio of the total mole of the terephthalic acid and the adipate to the mole of 1,4-butanediol is 1:1.0-1.8, esterification is carried out at normal pressure and the temperature of 150-220 DEG C, the pressure is reduced to high vacuum 10-150 Pa for the reaction, the final temperature for the reaction is 265-280 DEG C, and inert gas is utilized to recover the pressure to be normal to obtain the copolyester. The reaction time is shortened, the production amount of tetrahydrofuran is small, the intrinsic viscosity of copolyester chips is 0.90-1.32 dL / g, the hue b value of the product is between 0 and 8, the L value is between 68 and 85, and the product of the polybutylene terephthalate / adipate butanediol copolyester can be used in the fields of various soft package plastic products.
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Description

Technical field:

[0001] The present invention relates to polyester synthesis, and more specifically to the production of aliphatic-aromatic copolyesters prepared by direct esterification and copolycondensation of aromatic dicarboxylic acids, aliphatic dicarboxylic acids and aliphatic diols . Background technique:

[0002] Polyester prepared by condensation polymerization method has been widely used in various fields of people's daily life as engineering materials. They can be made into materials such as fibers, beverage bottles, and films. The preparation of these polymers goes through two processes: the esterification or transesterification of terephthalic acid / aliphatic esters or their esterified products with aliphatic diols. Usually the esterification process takes place under high pressure conditions. The process is carried out under normal pressure; vacuum polycondensation of esterification or transesterification products.

[0003] Polybutylene terephthalate / butylene adipat...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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