Preparation method of nano-silica having liquid rubber-grafted surface
A technology of nano-silica and liquid rubber, which is applied in the field of rubber fillers, can solve the problems of restricting large-scale production, unfavorable product industrialization, and difficulty in large-scale preparation, so as to shorten the vulcanization time, improve processing technology, and compatibility. Improved effect
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Embodiment 1
[0021] Weigh 150g of fumed silica (nano silica, particle size 25nm), 45g of liquid natural rubber, 4.5g of maleic anhydride, 2.25g of azobisisobutyronitrile, and 500ml of 1,4-dioxane into the reaction In the kettle, the product was obtained by mechanical stirring for 24 hours at a reaction temperature of 60°C.
[0022] The obtained product was suction filtered and then dissolved by adding 1000ml of dichloromethane to wash away the unreacted liquid natural rubber. The operation was repeated four times and placed in a vacuum drying oven at 70℃ for 30h to obtain the final grafted product. -Nano silica with liquid rubber grafted on the surface. The thermal weight loss analysis shows that the grafting rate is 5.4%, that is, the grafted liquid rubber accounts for 5.4% of the weight of the fumed silica (nano silica).
[0023] The vulcanization and mechanical properties of silica before and after grafting were compared. The silica before and after grafting was dried under conditions: 70℃×...
Embodiment 2
[0029] Weigh 200g of white carbon black (particle size 7nm), 60g of liquid natural rubber, 9g of maleic anhydride, 4.5g of azobisisobutyronitrile, and 1500ml of 1,4-dioxane into the reactor. The reaction temperature is The product was obtained by mechanical stirring for 48 hours at 65°C.
[0030] The obtained product was suction filtered and 1000ml of dichloromethane was added to wash off the unreacted liquid natural rubber. The operation was repeated four times and dried in a vacuum drying oven at 70° C. for 30 hours to obtain the final product. The thermal weight loss analysis shows that the liquid rubber accounts for 7.2% of the silica weight.
[0031] Vulcanization and mechanical performance test
[0032] The vulcanization and mechanical properties of silica before and after grafting were compared. The silica before and after grafting was dried under conditions: 70℃×5h. For mixing on an open mill, first plasticize the raw rubber, add stearic acid and ZnO to tap the rubber after...
Embodiment 3
[0038] Add white carbon black (particle size 12nm) 8g, liquid butadiene rubber (molecular weight 3k) 5.6g, maleic anhydride 0.56g, azobisisobutyronitrile 0.28g, and tetrahydrofuran 50ml, and put them into a pressure flask, at the reaction temperature The product was obtained by mechanical stirring for 48h at 65°C.
[0039] The obtained product was dissolved by adding 10 ml of dichloromethane to wash away the unreacted liquid butadiene rubber, and the operation was repeated four times and placed in a vacuum drying oven at 80° C. to obtain the final product. Liquid butadiene rubber accounts for 6.72% of the weight of the silica.
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