A kind of low modulus polycarbonate type polyurethane and preparation method thereof
A technology of polycarbonate type and polycarbonate II, which is applied in the field of polymer material preparation and can solve problems such as long time and easy residue of solvents
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[0019] The present invention at first provides a kind of preparation method of low modulus polycarbonate type polyurethane, and this method comprises:
[0020] Step 1: Under the protection of nitrogen, react polycarbonate diol with diphenylmethane diisocyanate at 60-70°C for 1.5-2h to obtain a reaction product; the polycarbonate diol is preferably vacuum extraction for 2-3h; the polycarbonate diol is preferably poly(1,6-hexyl carbonate) diol, poly(1,5-pentyl carbonate) diol or poly(1 , 6-hexyl-1,5-pentyl carbonate) glycol; The number average molecular weight of described polycarbonate glycol is preferably 1000-3000; Described polycarbonate glycol and diphenyl The mass ratio of methane diisocyanate is preferably 100:(11-75);
[0021] Step 2: Mix the reaction product obtained in step 1 with a small amount of low-boiling solvent to obtain a mixture; the low-boiling solvent is preferably tetrahydrofuran or chloroform; the mass ratio of the reaction product to the low-boiling solv...
Embodiment 1
[0026] 100 g of poly(1,6-hexyl carbonate) diol with a molecular weight of 1000 was vacuum-extracted for 2 hours, 75 g of diphenylmethane diisocyanate was added, and reacted at 60° C. for 1.5 hours under the protection of nitrogen to obtain a reaction product; 100 g Mix the above reaction product with 5g of tetrahydrofuran (THF) evenly to obtain a low-viscosity mixture; then add 10.3g of chain extender BDO to it, stir evenly, transfer it to a high-temperature mold at 100°C within 2 minutes, wait for 5 minutes, and THF is completely volatilized Finally, hot pressing at 100°C for 1 hour for curing and molding, and thermal annealing at 80°C for 20 hours to obtain a low modulus polycarbonate polyurethane. The elastic modulus data and mechanical property data of the polycarbonate polyurethane obtained in Example 1 are shown in Table 1.
Embodiment 2
[0028] 100 g of poly(1,6-hexyl-1,5-pentyl carbonate) diol with a molecular weight of 2000 was vacuum-extracted for 2 hours, 25 g of diphenylmethane diisocyanate was added, and reacted at 70°C for 2 hours under the protection of nitrogen. Obtain reaction product; With 100g above-mentioned reaction product and 15g trichloromethane (CHCl 3 ) and mix evenly to obtain a low-viscosity mixture; then add 3.6g chain extender BDO to it, stir evenly, quickly transfer to a high-temperature mold at 130°C within 1min, wait for 25min, CHCl 3 After complete volatilization, heat press at 130°C for 2 hours for curing and molding, and thermal annealing at 100°C for 24 hours to obtain a low modulus polycarbonate polyurethane. The elastic modulus data and mechanical property data of the polycarbonate polyurethane obtained in Example 2 are shown in Table 1.
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