Rubber and plastic compound modified asphalt with high temperature resistance and thermal storage stability and preparation method of rubber and plastic compound modified asphalt

Abstract

The invention discloses rubber and plastic compound modified asphalt with high temperature resistance and thermal storage stability. The rubber and plastic compound modified asphalt is prepared from matrix asphalt, waste tire rubber powder, polyethylene and a double-25 modifying agent, wherein the content of the waste tire rubber powder accounts for 10-35% of the weight of the matrix asphalt, the content of polyethylene accounts for 3-10% of the weight of the matrix asphalt, and the content of the double-25 modifying agent accounts for 0.5-4.0% of the weight of the waste tire rubber powder. The preparation method of the rubber and plastic compound modified asphalt comprises the steps of (1) heating the matrix asphalt to be in a hot melting state, slowly adding the weighed mixture of the weighed waste tire rubber powder, polyethylene and the double-25 modifying agent, and stirring to uniformly mix the mixture; and (2) shearing at a high speed for 45-120 minutes when heating the modified asphalt mixture obtained in the step (1) to 185-200 DEG C. The rubber and plastic compound modified asphalt disclosed by the invention is good in flowability under the condition of high-temperature service, easy to construct and spread, favorable in thermal storage stability and capable of reducing the cost and reducing environment pollution through recycling waste and old plastics and waste tires.

Description

technical field [0001] The invention relates to modified asphalt and a preparation method thereof, in particular to a rubber-plastic composite modified asphalt with high temperature resistance and thermal storage stability and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy, the traffic of high-grade highways (including expressways and first- and second-level highways) gradually presents the characteristics of heavy-duty vehicle, high-speed, and traffic channelization. In the interior, there will be rutting, subsidence, cracks, shifting, looseness, potholes and other diseases, which will seriously affect the road performance of asphalt pavement, causing great economic losses and potential safety hazards. Generally speaking, asphalt materials with good high-temperature anti-rutting, low-temperature anti-cracking, and durability can significantly improve the road performance of asphalt pavement. production cost. H...

AI Technical Summary

Problems solved by technology

[0006] Chinese patent CN 102020860 A provides a rubber-plastic composite modified asphalt with stable thermal storage and its preparation process. The preparation of rubber-plastic composite modified asphalt requires a wide variety of various additives, and the processing technology is cumbersome and the output is low. , not conducive to factory mass production

The modified asphalt crosslinking agent prepared by this patent is a mixture of dicumyl peroxide and sulfur, adding sulfur at high temperature will generate hydrogen sulfide (H 2 S), endangering the health of the operator and polluting the environment

In addition, the addition of sulfur will easily lead to poor control of the crosslinking degree of the system, increasing the difficulty of actual production operations

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