Carbon black-containing modified rubber and its preparation method
A modified rubber and rubber technology, which is applied in the field of modified rubber and its preparation, can solve the problems of weak rubber action, uneven dispersion, and large self-aggregation, and achieve enhanced action, improved dispersion, and elongation at break rate-enhancing effect
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Embodiment 1
[0027] Sonicate 10 g of carbon black in 500 mL of N,N-dimethylformamide for 15 min. Add 20g of phenyl bromoisocyanate to this suspension, stir at 50°C for 24 hours; then add 15g of sodium azide, and react at 80°C for 24 hours; add 100g of nitrile rubber and 1.5g of CuBr, 65 °C for 48 hours. Cool to room temperature, remove the solvent under reduced pressure, wash the solid with water, and dry to obtain a modified rubber containing carbon black. Properties: Tensile strength 15.5MPa, elongation at break 370%.
Embodiment 2
[0031] Sonicate 60 g of carbon black in 400 mL of N,N-dimethylformamide for 10 minutes. Add 20g of 4-bromophenylisocyanate to this suspension, stir at 35°C for 20 hours; then add 10g of sodium azide, and react at 75°C for 32 hours; add 100g of hydrogenated nitrile rubber and 1.3g (PPh 3 ) 3 CuBr, react at 65°C for 40 hours. Cool to room temperature, remove the solvent under reduced pressure, wash the solid with water, and dry to obtain a modified rubber containing carbon black. Properties: Tensile strength 33.5MPa, elongation at break 820%.
Embodiment 3
[0035] Sonicate 30 g of carbon black in 300 mL of N,N-dimethylformamide for 20 minutes. Add 25g of 2-bromo-5-isocyanate thiophene to this suspension, stir at 40°C for 24 hours; then add 20g of sodium azide, and react at 85°C for 15 hours; add 100g of hydrogenated nitrile rubber and 2.5g (PPh 3 ) 3 CuI, reacted at 70°C for 48 hours. Cool to room temperature, remove the solvent under reduced pressure, wash the solid with water, and dry to obtain a modified rubber containing carbon black. Properties: tensile strength 28.0MPa, elongation at break 740%.
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