Method for preparing modified asphalt

Abstract

The invention discloses a preparation method of modified asphalt. The modified asphalt is produced by asphalt and an undersaturation double bond compound which are reacted under the action of an evocating agent; the method comprises the following steps: firstly, the asphalt is put into a reaction kettle; the evocating agent is added into the reaction kettle; the weight of the evocating agent is 0.05-1 percent of the weight of the asphalt; the undersaturation double bond compound with the weight of 1-10 percent of that of the asphalt and 0.1-1 percent of N-phenyl maleimide are added into the reaction kettle at the temperature of 80-160 DEG C; and the pressure remains 0.1-0.4 MPa. The reaction is carried out for 3-6 hours; the reaction product is deaerated and filtered, and then the modified asphalt is obtained. The chemically modified asphalt provided by the method has good performance, which greatly improves the shortcomings that the common asphalt has strong temperature sensibility, low viscosity, poor flexility and the like. The modified asphalt can meet the use performance of roads and prolong the service life of roads; when the modified asphalt is used in road maintaining, maintenance, the time of traffic closing is shortened, the construction condition is improved and the construction efficiency is increased.

Description

technical field [0001] The invention relates to a preparation method of modified asphalt, which belongs to asphalt chemical modification technology. Background technique [0002] Asphalt is widely used in road paving, road repair and maintenance. Compared with cement concrete pavement, asphalt pavement has the advantages of seamless, comfortable driving, small vibration and low noise. However, ordinary asphalt has strong temperature sensitivity, low viscosity, and poor flexibility, which brings a lot of inconvenience to use. In order to overcome the disadvantages of ordinary asphalt, research on asphalt modification has been carried out at home and abroad. Modified asphalt is to add modifiers to asphalt to improve the performance of asphalt or asphalt mixture. Among them, the modifiers are mostly: rubber, resin, high molecular polymer, finely ground rubber powder or other fillers. The disadvantages of this asphalt modification method are: because the modifier is simply add...

AI Technical Summary

Problems solved by technology

The disadvantages of this asphalt modification method are: because the modifier is simply added to the asphalt for physical blending, the problem of segregation and stratification is easy to occur, and the asphalt has strong temperature sensitivity, low viscosity, and poor flexibility. Although some problems have been improved, there is no fundamental change in the molecular structure.