Thermoplastic polyurethane elastomer and preparation method thereof
A thermoplastic polyurethane and elastomer technology, applied in the field of polyurethane elastomer synthesis, can solve problems such as unsatisfactory mechanical properties of products, limit hard segment content, etc., to prevent physical cross-linking, improve elongation at break, and good weather resistance.
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Embodiment 1
[0043] figure 1 It is a schematic diagram of the preparation process of polyurethane elastomer in this example. In the figure, the compound of formula (1) represents polytetrahydrofuran ether diol, the compound of formula (2) represents isophorone diisocyanate, and the compound of formula (3) represents isocyanate (NCO) End-capped prepolymer, the black circles in the figure represent urethane groups, and the black squares represent urea groups. Its specific synthetic steps are as follows:
[0044] After vacuum dehydration of polytetrahydrofuran ether diol with a molecular weight of 1000 g / mol at 120°C for 2 h, take 1 mmol of dried polytetrahydrofuran ether diol and 5 mL of N,N-dimethylacetamide in a four-necked flask, Under the protection of nitrogen, add 2mmol isophorone diisocyanate and 0.1% to 0.2% mass fraction of dibutyltin dilaurate (based on the mass of polytetrahydrofuran ether glycol), keep warm at 60°C, stir at a constant speed for 10min, and then heat up to 75°C °...
Embodiment 2
[0050] After vacuum dehydrating polycarbonate diol with a molecular weight of 2000g / mol at 120°C for 2 h, take 1 mmol of dried polycarbonate diol and 5 mL of N,N-dimethylacetamide in a four-necked flask, Under the protection of nitrogen, add 5 mmol isophorone diisocyanate and 5 μL catalyst dibutyltin dilaurate, keep warm at 60 ° C, stir at a constant speed for 10 min, then raise the temperature to 80 ° C for 2 hours to obtain an isocyanate-terminated prepolymer, and then cool down to 50 ℃.
[0051] Dissolve 4mmol of isophoronediamine in 15mL of N,N-dimethylacetamide, add it into the syringe, then slowly inject the solution into the above system within 8 hours, continue the reaction at 50°C, and use Fu Rear leaf infrared spectroscopy tracks the changes in the isocyanate groups during the reaction. When the peak where the isocyanate group is observed in the infrared spectrogram disappears substantially, the reaction ends. Then the reacted solution is added to excess water for ...
Embodiment 3
[0056] After vacuum dehydration of poly(1,4-butylene adipate) with a molecular weight of 1000 g / mol at 120°C for 2 h, take 1 mmol of dried poly(1,4-butylene adipate) and 5 mL of N ,N-Dimethylacetamide in a four-neck flask, under the protection of nitrogen, add 4mmol of isophorone diisocyanate and two drops of dibutyltin dilaurate, keep warm at 60°C, stir at a constant speed for 10min, then heat up to 75°C for reaction After 3 hours, an isocyanate-terminated prepolymer was obtained, and then the temperature was lowered to 50°C.
[0057] Dissolve 3mmol of isophoronediamine in N,N-dimethylacetamide to form a 20ml solution, add it into the syringe, then slowly inject the solution into the above system within 6 hours, continue the reaction at 50°C, and at the same time Fourier transform infrared spectroscopy was used to track the changes of isocyanate groups during the reaction. When the peak where the isocyanate group is observed in the infrared spectrogram disappears substantial...
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