Automobile front baffle shock pad and preparation method thereof
A technology for front fenders and shock absorbing pads, which is applied in the field of automobile front fender shock pads and its preparation, can solve problems such as poor mechanical strength and general shock absorption effect, and achieve improved shock resistance, excellent shock resistance, and mechanical properties enhanced effect
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example 1
[0038] Add succinic acid, propoxy neopentyl glycol and tetraisopropyl titanate into the four-neck flask according to the mass ratio of 1:3:2, pass condensed water, heat to dissolve the raw materials, stir evenly, and distill the water out at 195 Reaction at ℃ for 3h to obtain a reaction solution;
[0039] Cool the reaction liquid to 170°C, then add propoxy neopentyl glycol with 10% mass of the reaction liquid, react at 195°C for 6 hours under nitrogen protection, cool down to room temperature after the acid value drops below 0.7, and obtain polyether ester diol ;
[0040] Add the above-mentioned polyether ester diol into the three-necked flask, vacuum dehydrate at 120°C for 2 hours, cool down to 50°C, add 2,4-toluene diisocyanate twice the mass of polyether ester diol and 60% polyether ester diol mass % polypropylene glycol polyether, react at 75°C for 2h, vacuumize at 85°C, remove air bubbles, and obtain polyurethane prepolymer;
[0041] Preheat the above polyurethane prepo...
example 2
[0046] Add succinic acid, propoxy neopentyl glycol and tetraisopropyl titanate into the four-neck flask according to the mass ratio of 1:3:2, pass condensed water, heat to dissolve the raw materials, stir evenly, and distill the water out at 197 Reaction at ℃ for 3h to obtain a reaction solution;
[0047] Cool the reaction liquid to 170°C, then add propoxy neopentyl glycol with 10% mass of the reaction liquid, react at 197°C for 6 hours under nitrogen protection, cool down to room temperature after the acid value drops below 0.7, and obtain polyether ester diol ;
[0048] Add the above-mentioned polyether ester diol into the three-necked flask, vacuum dehydrate at 122°C for 2h, cool down to 50°C, add 2,4-toluene diisocyanate twice the mass of polyether ester diol and 60% of the mass of polyether ester diol % polypropylene glycol polyether, react at 77°C for 2h, vacuumize at 85°C, remove air bubbles, and obtain polyurethane prepolymer;
[0049] Preheat the above polyurethane ...
example 3
[0054] Add succinic acid, propoxy neopentyl glycol and tetraisopropyl titanate into the four-neck flask according to the mass ratio of 1:3:2, pass condensed water, heat to dissolve the raw materials, stir evenly, and distill the water out at 199 Reaction at ℃ for 3h to obtain a reaction solution;
[0055] Cool the reaction liquid to 170°C, then add propoxy neopentyl glycol with 10% mass of the reaction liquid, react at 199°C for 6 hours under nitrogen protection, cool down to room temperature after the acid value drops below 0.7, and obtain polyether ester diol ;
[0056] Add the above-mentioned polyether ester diol into the three-necked flask, vacuum dehydrate at 124°C for 2 hours, cool down to 50°C, add 2,4-toluene diisocyanate twice the mass of polyether ester diol and 60% polyether ester diol mass % polypropylene glycol polyether, react at 79°C for 2h, vacuumize at 85°C, remove air bubbles, and obtain polyurethane prepolymer;
[0057] Preheat the above polyurethane prepo...
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