Polyurethane/urea for producing spandex and its production method
A polyurethane, saturation technology, applied in the field of spandex elastic fiber, can solve the problem of not providing
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Problems solved by technology
Method used
Examples
Embodiment 1-2
[0085] A blend of 1721.5 g of polyol A and 1176 g of polyol B was dehydrated in vacuo at 120°C for 1 hour. After cooling to room temperature, 50 ppm of ZNO was mixed into the blend. 724.4 g of MDI were added at 55°C. The reaction mixture was heated at 80° C. for 90 minutes until the NCO content of the prepolymer was 3.04%.
[0086] At 60°C, 1553.0 g 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 2.00%. Divide diluted prepolymer into 2 parts:
[0087] Part 1 (Example 1): 21.81 g of EDA, 11.10 g of IPDA, 0.95 g of DEA and 2348 g of DMAc were added to 1702 g of diluted prepolymer under rapid mixing. After one hour of mixing, the resulting solution had a viscosity of 30.8 Pa.s. An additional 65.4 g of the diluted prepolymer was added and mixed for 30 minutes. At this time, the viscosity of the solution was 57 Pa.s. An additional 43.1 of the diluted prepolymer was added and mixed f...
Embodiment 3 and comparative Embodiment 4
[0092] The procedure used in Example 1 and Comparative Example 2 was repeated using Polyol C. The relative amounts of raw materials used and the properties of the polymer solutions and fibers made from the solutions are listed in Table 1.
Embodiment 6-12
[0104] The prepolymers and fibers of Comparative Example 6 and Example 7 were prepared by the same procedure used in Examples 1 and 2, using the raw materials listed in Table 2 in the amounts indicated in Table 2.
[0105] The following procedure was used for Examples 9, 10, 11, 12 and Comparative Example 8. In an autoclave reactor, a single batch of 73 kg prepolymer was prepared from MDI, Polyol D and Polyol E in the relative amounts indicated in Table 2. The prepolymer was diluted with DMAc and reacted with a DMAc / amine stream in a continuous mechanical polymerizer to obtain a solution with the composition and characteristics listed in Table 2. Calculated on an equivalent basis, there was a 2% excess of amine groups relative to the NCO groups. The solution was then dry spun to form 40 denier fibers.
[0106] Example
[0107] Example
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