Preparation of easy cationic dyeable PTT

A cationic and propylene glycol technology, which is applied in the field of cationic dyeable PTT, can solve problems such as the inability to realize the dyeability and easy dyeing of normal pressure cationic dyes, the limitation of molding range and application range, and the decline of PTT fiber rebound properties, so as to improve the Spinnability and molding range, lower melting point and lower glass transition temperature, effect of lower crystallinity

Active Publication Date: 2009-03-04
JIANGSU ZHONGLU TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The electrophilic sulfonic acid group is introduced into the PTT molecular chain through the above method, which makes it relatively easy to combine with cationic dyes and has a high high-pressure dyeing rate, but the PTT prepared by this method cannot be dyed with normal-pressure cationic dyes. And easy to dye, the original excellent rebound properties of PTT fibers are reduced, and the spinnability is poor, so the molding range and application range of PTT are limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] According to the preparation method of the cationic dyeable PTT of the present embodiment, the method comprises the following steps:

[0025] ①. Primary esterification reaction: Take 18Kg of purified terephthalic acid (PTA), 8.4Kg1.3-propylene glycol (PDO) in a molar ratio of 1:1.25 into a 70L polyester reactor, and add organic titanium catalyst isopropyl titanate After stirring the ester and additive sodium acetate evenly, start to heat up and pressurize to 0.3Mpa to carry out the esterification reaction once. The esterification temperature is controlled at 220-260°C, and return to normal pressure after the esterification is completed;

[0026] ②. Add 1.5LPDO to the reaction kettle after ① to lower the temperature, so that the temperature in the kettle drops to 220°C. Add 562g of the mixed slurry of azelaic acid and PDO (containing 225g of azelaic acid) prepared in advance, and then implement the normal Press esterification until the esterification reaction ends;

[0...

Embodiment 2

[0029] According to the preparation method of the cationic dyeable PTT of the present embodiment, the method comprises the following steps:

[0030] ①. Primary esterification reaction: Take 18Kg of purified terephthalic acid (PTA), 8.4Kg1.3-propylene glycol (PDO) in a molar ratio of 1:1.25 into a 70L reactor, and add organic titanium catalysts such as isopropyl titanate and Auxiliary sodium acetate, after stirring evenly, start to heat up and pressurize to 0.3Mpa to carry out esterification, the esterification temperature is controlled at 220-260°C, and return to normal pressure after the esterification is completed;

[0031] ②, Secondary esterification reaction: add 1.5LPDO to the reactor after ① to lower the temperature, so that the temperature in the reactor drops to 220°C, and mix 562g of the mixed slurry of adipic acid and PDO (containing 225g of adipic acid ) is added, and then the normal pressure esterification is implemented until the esterification reaction ends;

[...

Embodiment 3

[0034] ①. Primary esterification reaction: Take 18Kg of purified terephthalic acid (PTA), 8.4Kg1.3-propylene glycol (PDO) in a molar ratio of 1:1.25 into a 70L reactor, and add organic titanium catalysts such as isopropyl titanate and Auxiliary sodium acetate, after stirring evenly, start to heat up and pressurize to 0.3Mpa to carry out esterification, the esterification temperature is controlled at 220-260°C, and return to normal pressure after the esterification is completed;

[0035] ②, secondary esterification reaction: add 1.5LPDO to the reaction kettle that has passed through ① to cool down, so that the temperature in the kettle is reduced to 220 °C, and 562g of the mixed slurry of isophthalic acid and PDO (containing isophthalic acid) prepared in advance Formic acid 225g) adds, then implements atmospheric pressure esterification, finishes to esterification;

[0036] 3. Polymerization reaction: add 1.4L SIPT solution (40%) to the reaction kettle through step 2., then add 5...

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Abstract

The invention relates to a preparation method of a cationic dyeable PTT, the preparation method sequentially comprises the first esterification reaction: 1,3-propanediol and terephthalic acid are added in a reactor according to a certain proportion, an esterification catalyst and an auxiliary agent are simultaneously added, the temperature is increased to 220-260 DEG C, and the reaction is finished till the esterification outlet water; the second esterification reaction: mixed slurry of dicarboxylic acid and 1,3-propanediol is added in the reactor, the temperature is increased to 220-260 DEG C for carrying out the second esterification reaction till the esterification outlet water, a polymerized monomer is obtained after the reaction is finished; the polymerization reaction: the polymerized monomer, the 1,3-propanediol solution of 5-sodium sulfonate dimethyl isophthalate, a flexible chain segment component, a polymerization catalyst and a stabilizer are sequentially added in the polymerization reactor, and the conventional polymerization is carried out under the conditions that the pressure is less than or equal to 40Pa and the temperature is 240-280 DEG C. The cationic dyeable PTT which is obtained by the method simultaneously has good rebound resilience and good cationic dye dyeable function under normal pressure.

Description

technical field [0001] The invention belongs to the field of organic synthesis, in particular to a preparation method of cationic dyeable PTT. Background technique [0002] Polytrimethylene terephthalate (PTT) is a promising new type of polyester material successfully developed by industry in the mid-1990s. It is a new organic polymer aromatic polyester product belonging to the same polymer series as PET and PBT. The successful development of PTT has further enriched the series of chemical fiber products. First of all, unlike PET polyester which is almost linear macromolecular conformation, the molecular conformation of PTT polymer is helical. The helical molecular conformation allows the PTT fiber to be highly "expanded", making the fiber have good elasticity; secondly, the glass transition temperature of PTT polyester is low, allowing its fiber and fabric to be dyed at a lower temperature, with excellent In addition, the Young's modulus of PTT fiber is low, the fabric f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/688C08G63/78
Inventor 边树昌
Owner JIANGSU ZHONGLU TECH DEV
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