Preparation method of asphalt release agent

The preparation method of an asphalt release agent of the present invention prepares a long-lasting environmental-friendly asphalt release agent through an ice water bath reaction of chloroacetic acid and ethylenediamine in an ethanol system under a certain process condition. The asphalt release agent is a associated liquid system of a Bola-type nitrogen-containing surface active agent of ethylenediamine diacetic acid and ethanol, can form a layer of non-migrating type micron grade film on a mold surface, and can play a corrosion preventive role on a metallic mold, and can naturally alienate the film surface through the interface interaction on encountering lyophobic asphalt, so as to achieve the effect of demolding. The asphalt release agent is not only able to solve the problems of asphalt demolding difficulties, asphalt use performance affected by the releasing agent, and high migration rate of the release agent after demolding, but has long-lasting and environment-friendly excellent performances. The asphalt release agent is innovative in the preparation method, simple in process and low in cost, and can be applied to the fields of processing, transportation, building materials, and water conservancy.