Method for preparing cationic modified PTT (polytrimethylene terephthalate) copolyester fiber

A copolyester, cationic technology, applied in the direction of one-component polyester rayon, etc., can solve the problems of more consumption, broken ends, easy to produce wool and so on

Active Publication Date: 2018-10-09
浙江汇纤纺织科技有限公司
View PDF11 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the above method can know cationic modified PTT copolyester, it also has the following problems: 1) in the preparation process of cationic modified PTT copolyester, dibasic acid and 1,3-propanediol alcohol in the existing technical system The acid molar ratio is much higher than 1:1. 1,3-propanediol undergoes self-condensation under high alkyd-acid molar ratio and generates by-products, which have a great impact on the fiber-forming properties of polyester. At the same time, high molar ratio requires more consumption Many 1,3-propanediol raw materials increase the cost; 2) After the esterification is completed, the polyester needs to be pre-condensed and final polycondensed, and the intrinsic viscosity of the pre-condensed product is generally above 0.25dL / g, which causes The molecular weight distribution of the final product is wide, the processing performance is not good, and it is easy to produce wool, broken ends, waste silk and other phenomena during the processing; 3) Melt direct spinning of cationic modified polyester has always been the key in the industry The technical problem of PTT and its cation-modified PTT copolyester has a great influence on its viscosity, molecular weight and color during the processing process.
Cationic modified PTT copolyester belongs to heat-sensitive polyester. The existing technology mainly tries to improve the conveying quality by lowering the conveying temperature during the melt conveying process, but the low-temperature conveying does increase the residence time of the melt in the pipeline, and there are greater viscosity drop
At the same time, the cation-modified PTT polyester is different from the conventional PTT polyester. The sulfonate group contained in the pipe has a strong adsorption force on the ionic bond of the pipe. The pipe needs to be cleaned and maintained regularly, otherwise the adsorbed polymer will adhere to the pipe wall. , resulting in poor spinnability

Method used

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
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A kind of preparation method of cationic modified PTT copolyester fiber, its concrete steps are as follows:

[0047] (1) Esterification reaction;

[0048] After mixing terephthalic acid and 1,3-propanediol at a molar ratio of 1:1.05 for beating, add a titanium-silicon-cobalt composite catalyst and a guide to carry out under the conditions of 225°C and 100KPa until the water output reaches 95% of the theoretical water output The reaction is terminated, wherein the guide is an esterified product with an esterification rate of 90% generated by the reaction of dimethyl isophthalate sulfonic acid sodium salt and ethylene glycol, and the addition of the guide is 5.0wt% of terephthalic acid, The addition amount of the titanium-silicon-cobalt composite catalyst is 110ppm of the quality of terephthalic acid, and the titanium-silicon-cobalt composite catalyst is composed of tetrabutyl titanate, silicon dioxide and cobalt acetate in a molar ratio of 1:0.8:0.1;

[0049] (2) precon...

Embodiment 2

[0057] A kind of preparation method of cationic modified PTT copolyester fiber, its concrete steps are as follows:

[0058] (1) Esterification reaction;

[0059] After mixing terephthalic acid and 1,3-propanediol at a molar ratio of 1:1.06 for beating, add a titanium silicon cobalt composite catalyst and a guide to carry out under the conditions of 220°C and 150KPa until the water output reaches 95% of the theoretical water output The reaction is terminated, wherein the guide is an esterified product with an esterification rate of 95% generated by the reaction of dimethyl isophthalate sulfonic acid sodium salt and propylene glycol, and the addition of the guide is 4.5wt% of terephthalic acid, titanium silicon The addition amount of the cobalt composite catalyst is 100ppm of the mass of terephthalic acid, and the titanium silicon cobalt composite catalyst is composed of metatitanic acid, silicon dioxide and cobalt acetate in a molar ratio of 1:2.5:0.5;

[0060] (2) precondensa...

Embodiment 3

[0068] A kind of preparation method of cationic modified PTT copolyester fiber, its concrete steps are as follows:

[0069] (1) Esterification reaction;

[0070] After mixing terephthalic acid and 1,3-propanediol with a molar ratio of 1:1.07 for beating, add a titanium silicon cobalt composite catalyst and a guide to carry out under the conditions of 230°C and 50KPa until the water output reaches 95% of the theoretical water output The reaction is terminated, wherein the guide is an esterified product with an esterification rate of 98% generated by the reaction of dimethyl isophthalate sulfonic acid sodium salt and butanediol, and the addition of the guide is 4.0wt% of terephthalic acid, The addition amount of the titanium-silicon-cobalt composite catalyst is 130ppm of the mass of terephthalic acid, and the titanium-silicon-cobalt composite catalyst is composed of tetrabutyl titanate, silicon dioxide and cobalt acetate in a molar ratio of 1:5.0:4.0;

[0071] (2) precondensati...

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
Login to view more

PUM

PropertyMeasurementUnit
glossaaaaaaaaaa
glossaaaaaaaaaa
glossaaaaaaaaaa
Login to view more

Abstract

The invention relates to a method for preparing cationic modified PTT (polytrimethylene terephalate) copolyester fiber. The method includes: evenly mixing terephthalic acid, 1,3-propylene glycol and aleading substance prior to performing sequentially esterification reaction, pre-polycondensation reaction and final polycondensation reaction to obtain cationic modified PTT copolyester which is subjected to polymer-melt directly spinning to obtain the cationic modified PTT copolyester fiber. The leading substance is compound ester generated from reaction of dimethyl isophthalate sulfonate sodiumsalt and dihydric alcohol, the molar ratio of phthalic acid to 1,3-propylene glycol is 1:1.05-1.10, time for pre-polycondensation reaction is 15-45 minutes, polysiloxane and polyethylene glycol are added in the final polycondensation reaction, and viscosity loss of the cationic modified PTT copolyester fiber is smaller than or equal to 0.001dL / g during polymer-melt directly spinning transportation.

Description

technical field [0001] The invention belongs to the field of polyester preparation, and in particular relates to a cationic modified PTT copolyester fiber and a preparation method thereof. Background technique [0002] Poly(1,3-trimethylene terephthalate) (PTT) is a kind of polymer obtained by esterification and polycondensation of 1,3-propanediol and terephthalic acid. PTT, PET, and PBT belong to the same polymer series of new organic polymer aromatic polyester products. The molecular conformation of PTT polyester presents a helical structure, which is different from the linear macromolecular conformation of PET polyester, which endows PTT polyester fiber with good elasticity. The glass transition temperature of PTT polyester is low, the Young's modulus of the fiber is low, and the fabric feels very soft. Based on these advantages, PTT polyester and its fibers are rapidly promoted in the chemical fiber industry. With the further development of PTT polyester fiber, consum...

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
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/92C08G63/688C08G63/85C08G63/78
CPCC08G63/6886C08G63/78C08G63/85D01F6/92
Inventor 吉鹏王华平王朝生陈向玲乌婧王宇王晶晶
Owner 浙江汇纤纺织科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap