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Preparing method of hyperdispersant and non-dyed polyurethane elastic fiber

A technology of polyurethane elasticity and hyperdispersant, which is applied in the field of spandex spinning technology, can solve the problems of changing the applicability of spandex yarn, the influence of molecular structure, and long switching cycle, etc., and achieve the effect of long storage time, low production cost and convenient operation

Active Publication Date: 2015-09-02
LIANYUNGANG DUZHONG NEW AOSHEN SPANDEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the participation of carbon black in the spandex polymerization reaction may produce many side reactions, which will affect the molecular structure, thus changing the applicability of spandex yarn
In addition, almost the entire production process equipment will be contaminated by colorants, which is not suitable for production lines with large production capacity, and the switching cycle between products of different colors will be very long

Method used

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  • Preparing method of hyperdispersant and non-dyed polyurethane elastic fiber

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1, a kind of hyperdispersant, the molecular formula of described hyperdispersant is

[0038]

[0039] In the formula: R1 is the residue of diisocyanate, R2 is the residue of glycol amine, R3 is methyl or tert-butyl, wherein, n=2, the solvation segment HO(-CH 2 -CH 2 -CH 2 -CH 2 -O-) m1 H, HO(-CH 2 -CH 2 -CH 2 -CH 2 -O-) m2 The molecular weight of H is 1500, wherein, n, m1, m2 are all positive integers;

[0040] This hyperdispersant has a BAB-type block structure, in which segment A is an anchoring group, and its main function is to adsorb on the surface of pigment or carbon black to prevent desorption of polyurethane hyperdispersant; segment B is a solvation chain, which The main function is to make a protective layer with a certain thickness on the surface of the pigment or carbon black to achieve steric hindrance and prevent the particles from approaching each other to form tight aggregates and flocs. At the same time, due to the good compatibil...

Embodiment 2

[0041] Embodiment 2, a kind of hyperdispersant, the molecular formula of described hyperdispersant is

[0042]

[0043] In the formula: R1 is the residue of diisocyanate, R2 is the residue of glycol amine, R3 is methyl or tert-butyl, wherein, n=8, the above-mentioned synthetic solvation segment HO(-CH 2 -CH 2 -CH 2 -CH 2 -O-) m1 H, HO(-CH 2 -CH 2 -CH 2 -CH 2 -O-) m2 The molecular weights of H are all 3500, where n, m1 and m2 are all positive integers.

Embodiment 3

[0044] Embodiment 3, a kind of hyperdispersant, the molecular formula of described hyperdispersant is

[0045]

[0046] In the formula: R1 is the residue of diisocyanate, R2 is the residue of glycol amine, R3 is methyl or tert-butyl, wherein, n=4, the above-mentioned synthetic solvation segment HO(-CH 2 -CH 2 -CH 2 -CH 2 -O-) m1 H, HO(-CH 2 -CH 2 -CH 2 -CH 2 -O-) m2 The molecular weights of H are respectively 2000, wherein n, m1 and m2 are all positive integers.

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Abstract

The invention relates to a preparing method of hyperdispersant and non-dyed polyurethane elastic fiber. According to the method, a diisocyanate compound and polytetramethylene ether glycol are added into a N,N-dimethylacetamide or N,N-dimethylformamide solvent according to the mole ratio being (1.6-2.2):1, and a prepolymer solution is prepared; the temperature is lowered to 8 DEG C to 10 DEG C while the stirring is carried out; a mixed amine solution is added, and a spinning stock solution with the viscosity being 3800 to 4500 poises and the solid content being 30 percent to 40 percent is obtained; the spinning stock solution is injected into color paste to prepare a premixed stock solution; the premixed stock solution and the spinning stock solution are subjected to multiage tackifying blending; then, flatting agents, lubrication debonding agents and yellowing-proof agents are added; the mixture is fully stirred, and a colored stock solution is prepared; the non-dyed polyurethane elastic fiber with the fiber number being 40D to 300D is prepared by a conventional method. The preparing method has the advantages that the hyperdispersant is prepared by the self, the uniformity and the stable dispersion of the color paste in the spinning stock solution are ensured, and the coloring process of multiage tackifying blending is adopted, so that the color paste can be uniformly, fast and stably dispersed in the spinning stock solution.

Description

technical field [0001] The invention relates to a spandex spinning process, in particular to a method for preparing a hyperdispersant and non-dyed polyurethane elastic fiber. Background technique [0002] Spandex is one of the important varieties of synthetic fibers. It has the advantages of large elongation and high elastic recovery rate. Dry-spun spandex has incomparable elasticity to other fibers. A small amount of addition can significantly modify the elasticity of the fabric, so it is compared to textiles. "MSG". Although spandex has many excellent properties, in terms of dyeing performance, the dye uptake and color fastness of spandex are not ideal, and there will be color difference after blending with other fibers, especially for blended fabrics with dark shades. In order to improve the dyeing effect of spandex, extreme dyeing conditions are often used, which may cause abnormal phenomena such as fusing of spandex filaments, which in turn affects the elasticity of t...

Claims

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Application Information

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IPC IPC(8): D01F1/10D01F1/04D01F6/70
Inventor 张斌孙振波孙迎春杨森曾登张星明尹广张华卫高久林李来华
Owner LIANYUNGANG DUZHONG NEW AOSHEN SPANDEX
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