Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Soft polyester fiber and preparation method thereof

A polyester fiber and soft technology, applied in the field of polyester fiber, can solve the problems of low dyeing rate of PTT fiber, environmental pollution, slow natural degradation rate, etc.

Active Publication Date: 2020-07-07
JIANGSU HENGLI CHEM FIBER
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although compared with PET fibers, PTT fibers have a lower glass transition temperature (45 ° C ~ 65 ° C), under the same conditions, the penetration of PTT by dyes is higher than that of PET, and PTT fibers can be dyed under normal pressure. However, the best dyeing temperature of PTT is around 110°C, and for bright red and yellow-brown dyes, even at 110°C, the dyeing rate of PTT fibers is low, which affects the popularization and application of PTT fibers to a certain extent
[0006] In addition, with the large-scale application of PTT fiber, the number of waste products after its use is huge. Although PTT will not directly cause harm to the environment, it is very resistant to the atmosphere and microbial agents, and it has become a class that needs to be treated urgently. of waste
At present, the common treatment methods for PTT waste include landfill, incineration and recycling. Although landfill and incineration are the simplest methods, they will also cause certain pollution to the environment. Degradation and recycling is an effective and scientific way to deal with PTT waste. The main methods include alcoholysis, ammonolysis, etc. Chemical degradation products such as alcohols, acids, esters, etc. can also be reused as chemical raw materials, but due to the compact structure and high crystallinity of PTT, its natural degradation rate is slow The time is very long, which seriously affects the application of degradation and recycling in the field of PTT waste treatment

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Soft polyester fiber and preparation method thereof
  • Soft polyester fiber and preparation method thereof
  • Soft polyester fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A kind of preparation method of soft polyester fiber, its step is as follows:

[0057] (1) prepare modified polyester;

[0058] (1.1) Synthesis of 2,2,5,5-tetramethyl-3,4-hexanediol, the method is as follows: first, the molar ratio of 2,2-methylpropanal and sulfuric acid is 1.5:1 2,2-Methylpropionaldehyde solution with a concentration of 320g / L and dilute sulfuric acid solution with a concentration of 200g / L are mixed and added to the cathodic electrolytic cell, and then the mixed solution is cooled to 12°C, followed by electrolytic reduction to 2,2 -The concentration of methapropanal is 9.5wt%, and finally cooling crystallization, separation and purification are carried out, and the schematic diagram of the reaction device adopted in the synthesis process is as follows figure 1 As shown, the reaction chemical equation is as follows:

[0059]

[0060] The structural formula of the prepared 2,2,5,5-tetramethyl-3,4-hexanediol is shown in formula (I), where R is -H; ...

Embodiment 2

[0087] A kind of preparation method of soft polyester fiber, its step is as follows:

[0088] (1) prepare modified polyester;

[0089](1.1) Synthetic 2,2,5,5-tetramethyl-3,4-diethyl-3,4-hexanediol, the method is: at first, press 2,2-dimethyl 3-pentanone and The molar ratio of sulfuric acid is that the ratio of 1.6:1 concentration is that the 2,2-dimethyl 3-pentanone solution of 350g / L and the dilute sulfuric acid solution of 210g / L are mixed and added in the cathodic electrolytic cell, then, the mixed Liquid cooling to 11 ° C, followed by electrolytic reduction to a concentration of 9.0 wt% of 2,2-dimethyl-3-pentanone, and finally cooling crystallization, separation and purification, the reaction device used in the synthesis process and the reaction chemical equation Consistent with Example 1, the structural formula of the prepared 2,2,5,5-tetramethyl-3,4-diethyl-3,4-hexanediol is shown in formula (I), where R for -CH 2 CH 3 ;

[0090] (1.2) Esterification reaction;

[0...

Embodiment 3

[0097] A kind of preparation method of soft polyester fiber, its step is as follows:

[0098] (1) prepare modified polyester;

[0099] (1.1) Synthesis of 2,2,4,4-tetramethyl-3,4-di-tert-butyl-3,4-hexanediol, the method is: first, according to 2,24,4-tetramethyl 3- The molar ratio of pentanone to sulfuric acid is 1.7:1. Mix the 2,24,4-tetramethyl-3-pentanone solution with a concentration of 340g / L and the dilute sulfuric acid solution with a concentration of 230g / L into the cathode electrolytic cell , and then, the mixed solution was cooled to 10°C, followed by electrolytic reduction to a concentration of 9.6 wt% of 2,24,4-tetramethyl-3-pentanone, and finally cooled crystallization, separation and purification, using the The reaction device and reaction chemical equation are consistent with embodiment 1, and the structural formula of the 2,2,4,4-tetramethyl-3,4-di-tert-butyl-3,4-hexanediol that makes is as formula (Ⅰ ), where R is -C(CH 3 ) 3 ;

[0100] (1.2) Esterificatio...

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
temperatureaaaaaaaaaa
molecular weight distributionaaaaaaaaaa
elongation at breakaaaaaaaaaa
Login to View More

Abstract

The invention relates to a soft polyester fiber and a preparation method thereof. The preparation method comprises the following steps: first, uniformly mixing terephthalic acid, propylene glycol, fluorine-containing binary acid and hexanediol with a tertiary butyl side group, and successively carrying out esterification reaction and polycondensation to prepare modified polyester; and preparing modified polyester FDY yarns from a modified polyester melt according to a FDY process to obtain the soft polyester fiber, wherein the fluorine-containing binary acid is 2,2-diflouro-1,3-propandioic acid, 2,2-diflouro-1,4-butanedioic acid, 2,2-diflouro-1,5-glutaric acid or 2,2,3,3-tetraflouro-1,4-butanedioic acid, and the structural formula of hexanediol with the tertiary butyl side group is shown in the description. The intrinsic viscosity of the product placed for 60 months at a temperature of 25 DEG C and relatively humidity of 65% is reduced by 9-12%. The preparation method is simple in process and low in cost. The prepared product is excellent in dyeing performance, high in natural degrading rate and huge in application prospect.

Description

technical field [0001] The invention belongs to the technical field of polyester fibers, relates to a soft polyester fiber and a preparation method thereof, in particular to a method for preparing soft PTT fibers by modifying PTT. Background technique [0002] Due to its excellent performance and moderate price, PET fiber is the most widely used type of chemical fiber. However, with the continuous development of society and the continuous improvement of people's needs, it is difficult for pure PET to meet people's increasing use needs. Therefore, PET fiber New polyester varieties with similar properties but better performance have become a research and development hotspot, the most representative of which is PTT fiber. [0003] PTT and PET belong to the polyester family, and their properties are similar. There are both rigid chain benzene rings and flexible methylene-CH in their molecular chains. 2 -, and connected by an ester group -CO-O-, is a typical linear macromolecule...

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 Patents(China)
IPC IPC(8): D01F6/84C08G63/682C08G63/78D06P3/54
Inventor 王山水汤方明丁竹君
Owner JIANGSU HENGLI CHEM FIBER
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com