Preparation of wide compatible, stable and rheologic activating urethane solution
A technology of urea urethane and toluene diisocyanate, which is applied in the field of preparation of urea urethane solution with wide compatibility, storage stability, and rheological activation, and can solve problems such as limited compatibility and poor rheological efficacy , to achieve wide compatibility and high storage stability
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Embodiment 1
[0028] Embodiment 1-7: Embodiment 1:
[0029] 0.5 mol (37 g) of n-butanol was added to 1.25 mol (217.5 g) of toluene diisocyanate (80%, 2,4-isomer, hereinafter referred to as T80) at 30°C during 2 hours . The temperature was kept below 45°C. After the addition was complete, stirring was continued for 2 hours until a theoretical NCO content of 33.0% was reached. Excess isocyanate was removed by vacuum (0.1 mbar) distillation at 150 to 170°C. The NCO content is 16.9%, the free TDI content is <0.5%.
Embodiment 2
[0031] 0.25 mol (53 g) of butyltriethylene glycol was added to 0.625 mol (108.75 g) of toluene diisocyanate (T65) at room temperature during 2 hours. The temperature was kept below 45°C. After the addition was complete, stirring was continued for 2.5 hours until a theoretical NCO content of 25.8% was reached. Excess isocyanate was removed by vacuum (0.1 mbar) distillation at 150 to 170°C. The NCO content is 10.9%, the free TDI content is <0.5%.
Embodiment 3
[0033] 0.25 mol (50 g) of isotridecanol was added to 0.75 mol (130.5 g) of toluene diisocyanate (T65) at 40° C. during 2 hours. The temperature was kept below 60°C. After the addition was complete, stirring was continued for 2 hours until a theoretical NCO content of 29.1% was reached. Excess isocyanate was removed by vacuum (0.1 mbar) distillation at 150 to 170°C. The NCO content is 11.3%, and the free TDI content is <0.5%.
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