A kind of polyurethane elastomer with low hardness, high strength and low pressure deformation and preparation method thereof
A technology of polyurethane elastomer and prepolymer, applied in the field of thermosetting polyurethane elastomer and its preparation, can solve the problems of difficult mixing, poor performance of polyurethane elastomer and high viscosity, and achieve excellent compression set and good degradation resistance. , the effect of excellent comprehensive performance
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Embodiment 1
[0030]Add 100g of PCDL1000 into the reactor, vacuum dehydrate it at 110°C for 3h, then lower it to 50°C, then add 36.82g of PPDI into the reactor, stir and mix, and react at 70°C for 2.5h to obtain a prepolymer with an NCO% content of 8%. Component A: 42.22g PCDL500 was vacuum dehydrated at 110°C for 3h, then lowered to 50°C, added 0.94gEGO and 3.75gGl, stirred and mixed uniformly to obtain component B containing 90%PCDL500, 2%EGO and 8%Gl, The mass ratio of EGO and Gl is 1:4; add the above components A and B into the reactor (the isocyanate index R is 1.1) to stir, mix, defoam, react at 70°C for 5min, and pour at 100°C In the mold; place the mold in a 100°C oven to cure for 36 hours and demould. The properties of the obtained materials are listed in Table 1.
Embodiment 2
[0032] Add 100g of PCDL2000 into the reactor, vacuum dehydrate at 120°C for 2.5h, then lower to 55°C, then add 16.89g of PPDI into the reactor, stir and mix, and react at 80°C for 2h to obtain a prepolymer with an NCO% content of 4%. Component A: dehydrate 21.44g of PCDL2000 at 120°C for 2.5h in vacuum, then lower it to 60°C, add 0.38g of BDO and 3.40g of TMP, stir and mix well to obtain a group B containing 85% of PCDL2000, 1.5% of BDO and 13.5% of TMP Parts, wherein the mass ratio of BDO and TMP is 1:9; add the above-mentioned components A and B into the reactor (the isocyanate index R is 1.05) to stir, mix, defoam, react at 75 ° C for 2 minutes, pour in In the mold at 110°C; place the mold in an oven at 110°C to cure for 48 hours and demould. The properties of the obtained materials are listed in Table 1.
Embodiment 3
[0034] Add 100g of PCDL3000 into the reactor, vacuum dehydrate it at 150°C for 1.5h, then lower it to 60°C, then add 11.66g of PPDI into the reactor to stir and mix, and react at 85°C for 1.5h to obtain a prepolymer with an NCO% content of 3%. Component A; 8.19g of PTMEG3000 was vacuum dehydrated at 150°C for 1.5h, then lowered to 80°C, added 0.35g of BDO, 3.16g of TMP and 0.25g of bismuth isooctanoate catalyst, stirred and mixed uniformly to obtain 70% PTMEG3000, 3% The B component of BDO and 27% TMP and bismuth isooctoate catalyst (the ratio of catalyst and polycarbonate diol in component A is 0.25:100), wherein the mass ratio of BDO and TMP is 1:9; Add component B and component B into the reactor (isocyanate index R is 0.95), stir, mix, defoam, react at 80°C for 1min, pour into a mold at 100°C; place the mold in an oven at 100°C for 60h to release the mold . The properties of the obtained materials are listed in Table 1.
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