Polyurethane/urea for producing spandex and its production method
A polyurethane, prepolymer technology, applied in the field of spandex elastic fibers, can solve the problem of not providing
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Embodiment 1
[0084] 1340 gm of polyol A, 987 gm of polyol B and 139.2 gm of polyol C were mixed and dehydrated in vacuo at 120°C for 1 hour. After cooling to room temperature, 50 ppm of ZNO was mixed into the polyol blend. 508.7 g of MDI were added at 55°C. The reaction mixture was heated at 80° C. for 110 minutes until the NCO content of the prepolymer was 2.04%.
[0085] At 60°C, 1275.6 gm of DMAc was added to the prepolymer and the mixture was cooled to 25°C. The homogenized mixture of prepolymer and DMAc had an NCO content of 1.40%. With rapid mixing, 14.96 gm of EDA, 7.80 gm of IPDA, 1.56 gm of DEA and 2331 gm of DMAc were added to 1706 gm of the diluted prepolymer. After one hour of mixing, the resulting solution had a viscosity of 61 Pa.s. An additional 64 gm of the diluted prepolymer was added and mixed for 30 minutes. At this point, the viscosity of the solution is 72 Pa.s.
[0086] To this viscous polymer solution was added 0.3% by weight of magnesium stearate, 2.0% by weig...
Embodiment 2-3
[0089] The procedure of Example 1 was repeated using the starting materials listed in Table 1 in the relative amounts listed in Table 1 . The properties of each polymer solution and fibers made from these solutions are listed in Table 1.
[0090] Example
[0091] 1 Actual Strength = strength based on actual denier at break.
Embodiment 4-5
[0095] The procedure of Example 1 was repeated using the starting materials listed in Table 2 in the relative amounts listed in Table 2. The properties of the prepolymers and fibers produced from those prepolymers are also listed in Table 2.
[0096] Example
4
5
Equivalent %, Polyol D
20.6
20.6
% by weight, polyol D
45.6
45.6
Equivalent %, Polyol B
44.9
44.9
% by weight, polyol B
49.7
49.7
Equivalent %, Polyol C
34.5
34.5
% by weight, polyol C
4.7
4.7
Overall molecular weight of the blend (Da)
1800
1800
NCO:OH
1.8
1.8
Prepolymer viscosity Pa·s
(50°C)
21.1
21.1
prepolymer catalyst
50ppm ZNO
50ppm ZNO
EDA, mol%
82.5
97.5
IPDA, mol%
15
0
DEA, mol%
2.5
2.5
...
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