A kind of PPDI-based polyurethane elastomer with low compression set and preparation method thereof
A technology of polyurethane elastomer and prepolymer, which is applied in the field of casting polyurethane elastomer and its preparation, and can solve the problems of carcinogenicity and high risk
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Embodiment 1
[0051] Add 100g of PTMEG1000 into the reactor, after vacuum dehydration at 120°C for 4h, lower to 50°C, then add 28.28g of PPDI into the reactor, stir and mix, and react at 70°C for 2h to obtain prepolymer A with NCO% content of 5%. Component; 5.32gHDO, 3.55gTMP and 0.05g bismuth isooctanoate catalyst are stirred, mix homogeneously, obtain and contain 60%HDO and 40%TMP and bismuth isooctanoate catalyst (the ratio of organic polyhydric alcohol in catalyst and A component is 0.05: 100) component B; add the above components A and B into the reactor (the isocyanate index R is 0.9) to stir, mix, defoam, react at 70°C for 5min, and pour it into a mold at 90°C; The mold was cured in an oven at 90°C for 48 hours. The properties of the obtained materials are listed in Table 1.
Embodiment 2
[0053] Add 100g of PTMEG2000 into the reactor, vacuum dehydrate at 130°C for 3h, then lower to 60°C, then add 14.30g of PPDI into the reactor, stir and mix, and react at 70°C for 1.5h to obtain a prepolymer with an NCO% content of 3%. A component; 1.93gBDO, 1.93gTMP and 0.30g bismuth naphthenate catalyst are stirred, mixed homogeneously, obtain and contain 50%BDO and 50%TMP bismuth naphthenate catalyst (the ratio of catalyst and organic polyalcohol in A component is 0.30:100) component B; put the above components A and B into the reactor (the isocyanate index R is 0.95) to stir, mix, defoam, react at 90°C for 3min, and pour into a mold at 100°C ; Place the mold in an oven at 100°C for 24 hours to cure. The properties of the obtained materials are listed in Table 1.
Embodiment 3
[0055] Add 100g of PTMEG3000 into the reactor, after vacuum dehydration at 150°C for 2h, then lower it to 70°C, then add 13.96g of PPDI into the reactor to stir and mix, and react at 70-90°C for 1.5-3h to obtain 4% NCO Prepolymer A component; 1.57gEGO, 2.35gTMP and 0.05g dibutyltin dilaurate catalyst are stirred, mix homogeneously, obtain and contain 40%EGO and 60%TMP and dibutyltin dilaurate catalyst (in catalyst and A component The ratio of organic polyols is 0.05:100) component B; add the above components A and B into the reactor (the isocyanate index R is 1.05) to stir, mix, defoam, and react at 80°C for 2 minutes, Cast in a mold at 100°C; place the mold in an oven at 100°C to cure for 24 hours. The properties of the obtained materials are listed in Table 1.
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Abstract
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