Spandex fiber with good chlorine resistance and discoloration resistance and its manufacturing method
A spandex fiber and discoloration-resistant technology, which is applied in rayon manufacturing, fiber chemical characteristics, textiles and papermaking, etc., can solve the problems of losing the inherent characteristics of spandex fiber, short-term or instant chlorine resistance effect, etc., and achieve the improvement of discoloration Effect
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[0016] The manufacturing method of the spandex fiber with good chlorine resistance and discoloration resistance described in the present invention comprises: the first step is the step of manufacturing polyurethane prepolymer solution, at first making diphenylmethane-4,4'-diisocyanate React with polytetramethylene ether glycol with a molecular weight of 1800 to 3000 to make a polyurethane prepolymer with isocyanate at both ends, and then add dissolved dimethylacetamide to make a polyurethane prepolymer solution.
[0017] The second step is a step of producing a polyurethane solution from the above polyurethane prepolymer solution, by adding a solution of ethylenediamine and diethylamine dissolved in dimethylacetamide to the prepolymer solution to produce a polyurethane solution.
[0018] The third step is the step of making spinning dope by adding to the polymer of polyurethane solution. In the step of making spinning dope, the additives used are light-resistant agent, inorgani...
Embodiment 1
[0040] In a nitrogen stream, 518g of diphenylmethane-4,4'-diisocyanate and 2328g of polytetramethylene ether glycol (molecular weight: 1800) were reacted at 90°C for 95 minutes with stirring, thus producing Polyurethane prepolymers with isocyanates. After cooling the prepolymer to room temperature, 4269 g of dimethylacetamide was added and dissolved to obtain a polyurethane prepolymer solution.
[0041] Next, 43 g of ethylenediamine and 9.1 g of diethylamine were dissolved in 1889 g of dimethylacetamide, and the above prepolymer solution was added at 9° C. or lower, thereby obtaining a polyurethane solution.
[0042] With respect to the solid content of the above polymers, the following were added and mixed as additives: 0.1 wt% titanium dioxide as light stabilizer, 4 wt% as chlorine resist coated with 1 wt% melamine phosphate relative to hydrotalcite , 2wt% stearic acid hydrotalcite [Mg 4 Al 2 (OH) 12 CO 3 ·3H 2 O]; and further add and mix the following substances in th...
Embodiment 2
[0056] In addition to using 2.0 wt% of 1,1,1',1'-tetramethyl-4,4'-(methylene-di-p-phenylene) as a disemicarbazide compound in the above-mentioned Example 1 Except disemicarbazide, the same polymer as in Example 1 was used to produce spandex fiber yarn, and chlorine resistance and discoloration resistance were evaluated under the same conditions as in Example 1 above, and the results are shown in Table 1.
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