Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method for high-alkali-resistance spandex

An alkali-resistant and energy-efficient spandex technology, applied in the field of polyurethane elastic fibers, can solve problems such as broken filaments and performance degradation, and achieve the effects of low cost, good effect, high chemical stability and thermal stability

Active Publication Date: 2016-03-02
ZHEJIANG HUAFENG SPANDEX
View PDF8 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Technical problem: The purpose of the present invention is to solve the deficiencies of the current research technology in combination with the existing technology of spandex, and provide a method for preparing spandex with high alkali resistance. Unfavorable problems such as broken filaments and performance degradation in the subsequent dyeing and finishing process

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

preparation example Construction

[0028] A kind of spandex with high alkali resistance performance and preparation method thereof of the present invention, its preparation steps are as follows:

[0029] 1.) Preparation of prepolymer solution: Add solvent, polyether diol and hydroxyl-terminated polyolefin in sequence in the prepolymerization tank, then add diisocyanate according to the molar ratio of NCO to OH of 1.60 to 2.00, and control the temperature of prepolymerization The temperature is 40-50°C, the reaction time is 60-90 minutes, and the reaction is carried out in a nitrogen atmosphere to obtain a prepolymer stock solution;

[0030] 2.) Transfer the obtained prepolymer stock solution to the chain extension tank, add solvent to the prepolymerization tank, fully stir and dissolve, and transfer it to the chain extension tank to form a prepolymer solution;

[0031] 3.) Then, when the temperature of the prepolymer solution is lowered to 6-12°C, the amine solution is slowly added to carry out chain extension ...

Embodiment 1

[0044] Add 8kgDMAc, 5kgPTMG (molecular weight: 2000) and 5kg hydroxyl-terminated polyvinylidene fluoride (molecular weight: 2000) into the prepolymerization tank, stir and mix well, when the temperature reaches about 25°C, add 2.3kgMDI, and heat up to 45°C ℃, the reaction time is 60min, and the prepolymerized product is obtained.

[0045] Transfer the pre-polymerization product to the chain extension tank, add 8kg of DMAc to the pre-polymerization tank, add cleaning solvent, transfer to the chain extension tank, cool to 10°C, and start slowly dropwise adding ethylenediamine, hexafluorodiamine, three A mixed chain extender amine solution of hydroxymethylpropane and diethylamine is used for chain extension, and diethylamine is used for chain termination. After the reaction is completed, anti-yellowing additives, anti-ultraviolet absorbers, antioxidants, lubricants, matting agents and other additives are added, and the viscosity reaches 7000 poises to obtain a spinning polyuretha...

Embodiment 2

[0050] Add 6kgDMAc, 9kgPTMG (molecular weight 1800) and 1kg hydroxyl-terminated polyvinylidene fluoride (molecular weight 1800) into the pre-polymerization tank, stir and mix well, when the temperature reaches about 25°C, add 2.5kgMDI and heat up to 50°C °C, the reaction time is 90min, and the prepolymerized product is obtained.

[0051] Transfer the pre-polymerization product to the chain extension tank, add 6kg of DMAc to the pre-polymerization tank, wash for 10 minutes, transfer to the chain extension tank, cool to 12°C, and start slowly dropwise adding ethylenediamine, chlorothiapyrdiamine, A mixed chain extender amine solution of triethanolamine and diethylamine is used for chain extension, and diethylamine is used for chain termination. After the reaction is completed, anti-yellowing additives, anti-ultraviolet absorbers, antioxidants, lubricants, matting agents and other additives are added, and the viscosity reaches 5000 poises to obtain a spinning polyurethaneurea sol...

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

No PUM Login to View More

Abstract

The invention relates to a preparation method for high-alkali-resistance spandex. The preparation method for high-alkali-resistance spandex comprises 1) successively adding a solvent, polyether glycol and hydroxyl-terminated polyolefin into a prepolymerization tank, then adding a diisocyanate according to the NCO-OH molar ratio of 1.60-2.00, and performing prepolymerization to obtain a prepolymer stock solution; 2) transferring the obtained prepolymer stock solution into a chain-expanding tank; 3) then cooling the prepolymer solution to 6-12 DEG C, slowly adding an amine solution to perform chain-expanding reaction, so as to obtain a polyurethane urea solution; 4) adding an anti-oxidant a coloring agent and a hydrotalcite accessory-material auxiliary agent, and stirring for 2-8 h, so as to obtain a homogenous polyurethane spinning solution; and 5) performing spinning and oiling through a dry process, so as to weave the high-alkali-resistance spandex. The prepared spandex possesses excellent alkali resistance, damage on spandex fiber in the processes of dyeing, finishing and alkali washing is improved, and the soaping resistance also is improved.

Description

technical field [0001] The invention relates to a preparation method of spandex with high alkali resistance performance, belonging to the field of polyurethane elastic fibers. The spandex fiber prepared by the invention has excellent alkali-resistance performance, avoids damage to the fabric in the subsequent dyeing and finishing alkali-washing process, and improves the soaping-resistance performance of the spandex-containing fabric. Background technique [0002] Polyurethane elastic fiber, also known as spandex, is a multi-block copolymer with alternating soft and hard segments. It has the advantages of high breaking strength and high elastic recovery rate. Therefore, spandex fiber is widely used in daily fabrics. [0003] Under normal circumstances, elastic fabrics containing spandex will inevitably be attacked by alkali substances during the subsequent dyeing and finishing process and the soaping process of clothing containing spandex, which will cause the performance of ...

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
IPC IPC(8): D01F6/94D01F1/10D01F11/08C08G18/66C08G18/48C08G18/62C08G18/12
CPCC08G18/12C08G18/4854C08G18/6279C08G18/6685D01F1/10D01F6/94D01F11/08C08G18/3228C08G18/3814C08G18/3281C08G18/3874
Inventor 邵晓林杨晓印温作杨池晓智吴志豪许图远周志伟
Owner ZHEJIANG HUAFENG SPANDEX