Preparing method of hyperdispersant and non-dyed polyurethane elastic fiber
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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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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 t
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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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[0037] Example 1, a hyperdispersant, the molecular formula of the hyperdispersant is
[0038]
[0039] In the formula: R1 is the residue of diisocyanate, R2 is the residue of glycolamine, R3 is methyl or tert-butyl, where n=2, the solvation section 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, where n, m1 and m2 are all positive integers;
[0040] This hyperdispersant has a BAB-type block structure, in which the A segment is an anchor group, and its main function is to adsorb on the surface of the pigment or carbon black to prevent the desorption of the polyurethane-based hyperdispersant; the B segment is a solvated chain, it 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 getting close to each other to form close agglomerates and flocs. At the same time, due to the good compatibility of the so...
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[0041] Example 2, a hyperdispersant, the molecular formula of the 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, where n=8, the solvation section 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 3500, and n, m1, and m2 are all positive integers.
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[0044] Example 3, a hyperdispersant, the molecular formula of the 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, where n=4, the solvation section 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 2000 respectively, where n, m1, and m2 are all positive integers.
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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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...
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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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