After studying the dosage of crumb rubber, plasticizer resin and the size of crumb rubber, the influencing factors and the mechanics of the asphalt modified by crumb rubber were analyzed.

A blend with better properties could be obtained by adding phenolic resin 2402/tin bichloride (8/0. 5) curative and a certain level of dioctyl phthalate plasticizer and HAF reinforcing agent.

In this paper the nontoxic plasticizer tributyl citrate has been prepared by the catalysis of the molecular sieve and the ion exchange resin.