Low-compression permanently deformed PPDI (p-phenylene diisocyanate)-based polyurethane elastomer and preparation method therefor
A technology with permanent deformation and low compression, which is applied in the field of casting polyurethane elastomer and its preparation, and can solve problems such as carcinogenicity and high risk
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Embodiment 1
[0036] Add 100g PTMEG1000 to the reactor, vacuum dehydration at 120°C for 4h, then drop to 50°C, then add 28.28g PPDI into the reactor to stir and mix, and react at 70°C for 2h to obtain prepolymer group A with 5% NCO% content Parts; Stir and mix 5.32g HDO, 3.55g TMP and 0.05g bismuth isooctanoate catalyst to obtain a catalyst containing 60% HDO and 40% TMP and bismuth isooctanoate (the ratio of the catalyst to the organic polyol in component A is 0.05:100 ) Component B; add the above component A and component B into the reactor (isocyanate index R is 0.9), stir, mix, and defoam, react at 70℃ for 5min, and pour into a mold at 90℃; Place it in a 90℃ oven to cure for 48h. The material properties obtained are shown in Table 1.
Embodiment 2
[0038] Add 100g of PTMEG2000 to the reactor, vacuum dehydration at 130°C for 3h, then drop to 60°C, then add 14.30g of PPDI to the reactor to stir and mix, and react at 70°C for 1.5h to obtain prepolymer A with 3% NCO% Components: 1.93g BDO, 1.93g TMP and 0.30g bismuth naphthenate catalyst were stirred and mixed uniformly to obtain a catalyst containing 50% BDO and 50% TMP bismuth naphthenate (the ratio of the catalyst to the organic polyol in component A was 0.30 : 100) component B; add the above component A and component B into the reactor (isocyanate index R is 0.95), stir, mix, and degas, react at 90°C for 3 minutes, and pour into a mold at 100°C; Place the mold in a 100°C oven and cure for 24 hours. The material properties obtained are shown in Table 1.
Embodiment 3
[0040] Add 100g PTMEG3000 to the reactor, vacuum dehydration at 150°C for 2h, then drop to 70°C, then add 13.96g PPDI into the reactor to stir and mix, and react at 70-90°C for 1.5-3h to obtain a pre-treatment with 4% NCO% content. Polymer component A; Stir and mix 1.57g EGO, 2.35g TMP and 0.05g dibutyltin dilaurate catalyst to obtain a catalyst containing 40% EGO and 60% TMP and dibutyltin dilaurate (the catalyst is organic in component A). The ratio of polyol is 0.05:100) component B; add the above component A and component B into the reactor (isocyanate index R is 1.05), stir, mix, and degas, react at 80°C for 2 minutes, and cast Place the mold in a 100°C mold; place the mold in a 100°C oven to cure for 24 hours. The material properties obtained are shown in Table 1.
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