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Preparation method of flesh-colored spandex

A flesh-colored and spandex technology, applied in the field of polyurethane elastic fiber material manufacturing, can solve problems such as low color fastness, difficult coloring, and affecting the aesthetics of fabrics, and achieve excellent mechanical properties, enhanced mechanical properties, and lasting flesh-colored effects

Inactive Publication Date: 2015-01-14
ZHEJIANG HUAFENG SPANDEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high polymer structure of spandex fiber makes it difficult to color during the dyeing process, and the color fastness is low. Under high draft conditions, the fabric is prone to "whitening" phenomenon, which affects the aesthetics of the fabric
Therefore, it is necessary to obtain a satisfactory dyeing effect of spandex under high temperature conditions. However, high temperature dyeing not only consumes energy, but also deteriorates the mechanical properties of spandex.

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
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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] (2) Preparation of prepolymer: Add DMAC and polyether in sequence in the prepolymerization tank, and then add diisocyanate according to the set NCO / OH ratio; ~150min;

[0029] (3) Add the prepared flesh-colored pigment solution to the fully reacted prepolymer, stir fully to obtain an oligomer solution with uniform pigment distribution, and then transfer to the chain extension tank;

[0030] (4) Cooling the chain extension tank to 0-10°C, adding the chain extension amine solution dropwise under control, and carrying out the chain extension reaction to obtain the polyurethane urea solution;

[0031] (5) Add auxiliary material additives to the polyurethane urea solution obtained in step 4, and carry out sufficient stirring to disperse and mature to obtain a polyurethane urea spinning solution;

[0032] (6) With the help of the dry spinning system and process, the polyallophanate spinning solution is sprayed and stretched, dried at high temperature, oiled with oil, and wou...

Embodiment 1

[0047] The specific preparation process of flesh-colored spandex is as follows:

[0048] Step 1. The nano-pigments are dried at 90-120° C. for 2-4 hours, and the ratios of the three kinds of nano-pigments of white, red and yellow are 80wt%: 5wt%: 15wt%, and 31g of nano-TiO 2 , 2g nano-iron red, 5.8g nano-iron yellow, added to 111g DMAC. Then heat to 100°C, add 1.9g of silane coupling agent KH-550 according to 5wt% of the three nano-pigments, and stir for 2 hours under 40KHZ ultrasonic conditions to obtain a flesh-colored solution with uniformly dispersed nanoparticles, with a concentration of 35%;

[0049] Step 2. Add 5kg N,N-dimethylacetamide and 10kg polytetramethylene ether glycol (molecular weight 1800) into the prepolymerization tank, stir and mix well, and when the temperature reaches about 25°C, follow the NCO Add 2.351kg of 4,4-diphenylmethane diisocyanate at / OH of 1.70, raise the temperature to 45°C, and the reaction time is 120min to obtain the prepolymerized produ...

Embodiment 2

[0055] The specific preparation process of flesh-colored spandex is as follows:

[0056] Step 1. The nano-pigments are dried at 90-120° C. for 2-4 hours, and the ratios of the three nano-pigments of white, red and yellow are 80wt%: 10wt%: 10wt%, and 31g of nano-TiO 2 , 3.9g nano-iron red, 3.9g nano-iron yellow, added to 111g DMAC. Then heat to 100°C, add 1.9g of silane coupling agent KH-550 according to 5wt% of the three nano-pigments, and stir for 2 hours under 40KHZ ultrasonic conditions to obtain a flesh-colored solution with uniformly dispersed nanoparticles, with a concentration of 35%;

[0057] Step 2. Add 5kg N,N-dimethylacetamide and 10kg polytetramethylene ether glycol (molecular weight 1800) into the prepolymerization tank, stir and mix well, and when the temperature reaches about 25°C, follow the NCO Add 2.351kg of 4,4-diphenylmethane diisocyanate at / OH of 1.70, raise the temperature to 45°C, and the reaction time is 120min to obtain the prepolymerized product;

...

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Abstract

The invention relates to a preparation method of flesh-colored spandex. The preparation method comprises the following steps: in a pre-polymerization tank, sequentially adding DMAC and polytetramethylene ether glycol PTMG, then adding 4,4-diphenylmethane diisocyanate 4,4-MDI according to the set NCO / OH ratio, and performing full pre-polymerization reaction; after the reaction is over, adding the prepared pigment solution, and stirring to obtain a low-polymer solution in which pigment is uniformly distributed; and transferring a polymerized product into a chain extension tank, stirring to be even, controlling to dropwise add a mixed amine DMAC solution at low temperature so as to perform chain propagation and chain termination to finally obtain polyurethane urea solution, wherein the mixed amine DMAC contains a diamine chain extender and a monoamines termination agent; then adding an antioxidant, a lubricant, a delustrant, an ultraviolet absorbent and the like, stirring and dispersing; and finally, by virtue of dry spinning system, performing spinneret drawing, high-temperature drying, oiling of an oil agent, winding and forming to pigment-containing polyurethane urea stock solution, so as to obtain flesh-colored spandex.

Description

technical field [0001] The invention relates to a method for preparing flesh-colored spandex, and belongs to the technical field of polyurethane elastic fiber material manufacturing. Background technique [0002] Polyurethane elastic fiber, commonly known as spandex, is a macromolecule composed of at least 85% (weight percent) polyurethane segments. Due to its advantages such as high breaking strength, high breaking elongation, excellent elasticity and resilience, it is mixed with other yarns Ready-made garments have the advantages of comfortable wearing, no restraint, and beautiful appearance. With the development of people's needs, flesh-colored spandex is gradually becoming more popular in flesh-colored fabrics such as women's stockings, underwear, and leggings. However, the high polymer structure of spandex fiber makes it difficult to color during the dyeing process, and the color fastness is low. Under high draft conditions, the fabric is prone to "whitening" phenomeno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/94D01F1/04C08G18/76C08G18/66C08G18/48C08G18/10C08K9/06C08K9/04C08K3/22C08K3/36
Inventor 池晓智温作杨李燕刘亚辉陈玲梁红军费长书席青
Owner ZHEJIANG HUAFENG SPANDEX
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