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

Polyamide fiber with enhanced dyeing properties, process for obtaining such fiber and polyamide article made therefrom

a polyamide and dyeing technology, applied in the dyeing process, monocomponent polyamide artificial filaments, textiles and papermaking, etc., can solve the problems of poor color build-up and fastness properties, limited use of dispersed dyes on polyamide, and high energy consumption of temperatures and tim

Inactive Publication Date: 2018-05-31
RHODIA POLIAMIDA E ESPECIALIDADES LTDA
View PDF7 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes the increasing commercial interest in polyamides, specifically for use in textile goods. Polyamides have advantages like easy-care, fast-drying properties, high durability, and excellent physical properties. The text also discusses attempts to optimize the dyeing process to reduce time, energy, and chemical auxiliaries, as well as initiatives to make dyes more sustainable and efficient. However, the technical effects of the patent text do not aim to reduce the dyeing temperature and time.

Problems solved by technology

However, the use of dispersed dyes on polyamide is restricted to pale shades because of poor color build-up and fastness properties as the dispersed dye is an insoluble dye that diffuses into the fiber interior rather than combining by chemical interactions.
However, those temperatures and time are energy consuming and not environment friendly.
These approaches lead to a deeper dark color but don't aim at reducing the dyeing temperature and time.
In view of the above, up to now there is no solution for improving dyeing properties of a polyamide, such as intrinsic low-temperature and faster dyeing properties.

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

first embodiment

[0046]According to a first embodiment, the melt spinning extrusion comprises the following steps:[0047]a1. Feeding the first polyamide as a melt, pellet or powder into the inlet of a screw extruder or grid spinning head,[0048]a2. Melting, homogenizing and pressurizing the polyamide,[0049]a3. Spinning the molten polyamide into a fiber,[0050]a4. Cooling down the fiber and winding.

wherein the second polyamide is continuously introduced during step al as a pellet or powder, preferably with the use of a dosing apparatus.

[0051]As mentioned above, the second polyamide is preferably continuously introduced during step al of the single-screw extruder. It can be added as a polyamide pellet or powder, by means of a dosing apparatus like a dosing pump or a gravimetric feeding apparatus, preferably a gravimetric feeding apparatus. According to this embodiment, the second polyamide is melt-mixed with the first polyamide, before the formation of the fiber. The second polyamide can be optionally dr...

second embodiment

[0054]According to a second embodiment, the melt-spinning extrusion comprises the following steps:[0055]a′1. Feeding a blend of at least the first and the second polyamides as a melt, pellet or powder into the inlet of a screw extruder or grid spinning head,[0056]a2. Melting, homogenizing and pressurizing the polyamide,[0057]a3. Spinning the molten polyamide into a fiber,[0058]a4. Cooling down the fiber and winding.

wherein the blend of at least the first and the second polyamides is obtained by a step a0 previous to step a′1, and comprising a polymerization of diacids and diamines monomers corresponding to at least the first and the second polyamides or salts thereof.

[0059]The polymerization at step a0 generally comprises the following steps: 1—concentration of the nylon salt by evaporation of water, in which the nylon salt is a combination of diacids and diamines monomers corresponding to at least the first and the second polyamides or salts thereof; 2—polymerization, under pressur...

third embodiment

[0060]According to a third embodiment, the melt-spinning extrusion comprises the following steps:[0061]a1. Feeding the first polyamide as a melt, pellet or powder into the inlet of a screw extruder or grid spinning head,[0062]a2. Melting, homogenizing and pressurizing the polyamide,[0063]a3. Spinning the molten polyamide into a fiber,[0064]a4. Cooling down the fiber and winding.

[0065]Wherein the second polyamide is preferably continuously introduced as a polyamide melt during step a3 of the screw extruder, preferably a single-screw extruder. It is added, by means of an additional screw extruder, preferably a single-screw extruder. According to this embodiment, the second polyamide is blended with the first polyamide upon leaving the spinning pack spinneret, at the formation of the fiber, thereby forming a bi-component fiber.

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
boiling temperatureaaaaaaaaaa
mol %aaaaaaaaaa
Login to View More

Abstract

The present invention relates to a polyamide fiber with enhanced dyeing properties. The polyamide fiber is suitable for low-temperature dyeing and shorter dyeing cycle. The present invention also discloses a method for obtaining such a fiber. The polyamide fiber is obtained by blending at least a polyamide 5.X, X being an integer from 4 to 16 with an aliphatic polyamide during the melt-spinning extrusion of the polyamide fiber. The blended polyamide fiber and articles made therefrom can be dyed at a lower temperature than the usual boiling temperature, and the dyeing time is half of the time of a normal dyeing cycle. The dyed polyamide fiber and article also show enhanced fastness to washing and perspiration.

Description

PREVIOUS ART[0001]The commercial interest in polyamides, particularly based on fibers and yarns used in textile goods such as underwear, sportswear, leisurewear and nightwear, has been extensively increased because of theirs advantages in this field, like easy-care, fast-drying properties, high durability, excellent physical properties, abrasion resistance, balanced moisture absorption, good elasticity, lightness, comfort and softness.[0002]Polyamide, also known as nylon, is a linear condensation polymer composed of repeated primary bonds of amide group. A polyamide fiber is generally produced by melt-spinning extrusion and is available in staple fiber, tow, monofilament, multi-filament, flat or texturized form. Polyamides are semi-crystalline polymers. The amide group —(—CO—NH—)— provides hydrogen bonding between polyamide intermolecular chains, providing high strength at elevated temperatures, toughness at low temperatures, wear and abrasion resistance, low friction coefficient an...

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(United States)
IPC IPC(8): D01F6/90D06P3/24
CPCD01F6/90D06P3/241
Inventor REDONDO BONALDI, RENATAGORESCU, GABRIELFERREIRA DOS SANTOS, EVERTONCANDIDO OLIVEIRA, PAULO
Owner RHODIA POLIAMIDA E ESPECIALIDADES LTDA
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