A kind of graft modification method of waste rubber powder for asphalt modification
A technology of graft modification and asphalt modification, which is applied in the field of preparation of a graft modified waste rubber powder, which can solve the problem of weak interface between waste rubber powder and asphalt, and achieve stacking treatment and environmental protection application, saving resources , Reduce the effect of construction viscosity
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Embodiment 1
[0030] Put water and 20 mesh unmodified normal temperature waste rubber powder 1 into the container according to the mass ratio of 1:1, and prepare the waste rubber powder suspension by ultrasonic dispersion for 10 minutes; add hydrogen peroxide dropwise to the waste rubber powder according to the mass ratio of 0.05:1 suspension, then mechanically stirred at 30°C for 4 hours, and the reaction product was washed with distilled water and dried to obtain hydrogen peroxide modified waste rubber powder 1; at 50°C under nitrogen protection, the equivalent ratio of isocyanate groups and hydroxyl groups was weighed as 0.1:1 toluene diisocyanate and n-hexadecanol, add isocyanate to the alcohol dropwise within 60 minutes, react for 4 hours, and prepare prepolymer 1; add hydrogen peroxide modified waste rubber powder into prepolymer 1 in a mass ratio of 1:1, °C for 1 h to obtain graft modified waste rubber powder 1.
[0031] In order to prove the synthesis of prepolymer 1, p-toluene diis...
Embodiment 2
[0034]Put water and 100-mesh unmodified wet-process waste rubber powder 2 into a container at a mass ratio of 4:1, and disperse ultrasonically for 60 minutes to prepare a waste rubber powder suspension; add hydrogen peroxide dropwise to the waste rubber powder at a mass ratio of 0.4:1 suspension, then mechanically stirred at 80°C for 1 h, the reaction product was washed with distilled water and dried to obtain hydrogen peroxide modified waste rubber powder 2; at 120°C under nitrogen protection, the equivalent ratio of isocyanate groups and hydroxyl groups was weighed as 2:1 octacosanol and leaf alcohol are mixed alcohols, the equivalent ratio of diphenylmethane diisocyanate and mixed alcohol is 1:1, and isocyanate is added dropwise to the mixed alcohol within 10 minutes, and the reaction is 1 hour to prepare a prepolymer; Hydrogen peroxide modified waste rubber powder was added to prepolymer 2 at a mass ratio of 3:1, and reacted at 80°C for 4 hours to obtain graft modified wast...
Embodiment 3
[0037] In order to compare the influence of modified waste rubber powder on asphalt properties, the unmodified waste rubber powder 1 obtained in the preparation process of Example 1, the hydrogen peroxide modified waste rubber powder 1, the graft modified waste rubber powder 1, and the waste rubber powder 15wt% of powder was added to asphalt to prepare rubber-modified asphalt, and its comprehensive performance was tested. The results are shown in Table 1. Compared with the properties of unmodified waste rubber powder 1 / asphalt, the softening effect of hydrogen peroxide modified waste rubber powder 1 / asphalt Point, ductility at 5°C and penetration ratio at 25°C increased after aging, viscosity at 175°C and penetration at 25°C decreased, and the above properties of asphalt after graft modification were further optimized.
PUM
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