A kind of preparation method of polyurethane urea elastic fiber with high heat setting efficiency
A technology of polyurethane urea and elastic fiber is applied in the manufacture of spandex fiber and the manufacture of new functional spandex fiber. The effect of efficiency
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Embodiment 1
[0047] 1) Mix polytetramethylene ether glycol and 4,4'-diphenylmethane diisocyanate and react at 90°C for 120 minutes to prepare a prepolymer, in which 4,4'-diphenylmethane diisocyanate and poly The molar ratio of tetramethylene ether glycol is 1.70:1;
[0048] 2) Dissolve ethylenediamine and propylenediamine in a molar ratio of 4:1 into the solvent N,N-dimethylacetamide, and then add diethylamine with a diamine molar content of 15% to form a concentration of 6.00% by mass The mixed amine solution; then the mixed amine solution is added to the prepolymer solution and stirred, wherein the molar ratio of the amine group to the isocyanate group is 1.05:1, and the reaction is carried out to prepare the secondary polymerization stock solution ;
[0049]3) 0.5wt% of 2-(2'-hydroxyl-3',5'-di-tert-butylphenyl)-benzotriazole), 0.5wt% of bis(N,N-dimethylhydrazide Amino 4-phenyl)methane, 0.1wt% magnesium stearate, 0.5wt% titanium dioxide were added to N,N-dimethylacetamide and ground fo...
Embodiment 2
[0053] 20D polyurethaneurea elastic fibers having high heat-setting efficiency were obtained in the same manner as described in Example 1 except that the content of polymethylmethacrylate was 5 wt%.
Embodiment 3
[0055] 20D polyurethaneurea elastic fibers having high heat-setting efficiency were obtained in the same manner as described in Example 1 except that the polymethyl methacrylate content was 15 wt%.
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