Preparation and Storage Stability of Asphalt Emulsions Made from Modified Lignin Cationic Asphalt Emulsifiers

The asphalt emulsions were prepared using modified lignin amines as cationic emulsifiers. The effect of types and dosage of lignin cationic emulsifiers on the preparation and storage stability of asphalt emulsions were discussed by measurement of average particle diameter and Zeta potential of emulsions. The experiments show that the higher the surface activity of emulsifiers was, the smaller the average particle diameters of emulsions became. With the increasing of dosage of emulsifiers, the average particle diameters of emulsions descended. The storage stability of emulsions was improved distinctly when the lipophil dodecyl group was introduced into emulsifiers, which was attributed to good surface activity and enhanced mechanical strength of interfacial membrane for the alkyl chain of dodecyl group could be inserted in the asphalt particles.