Asphalt adhesion promoters

Previous investigators have drawn attention to the beneficial effect of lime when added in small quantities to asphaltic bitumen. The lime helps retard oxidative hardening (13) and reduces the tendency towards water-stripping (4,11,12). Most asphalts are slightly acidic because of the presence of phenolic or carboxylic substituents and would therefore react with basic oxides to form insoluble salts. For example, Fromm (10) has described the use of iron salts of naphthenic acids as adhesion promoters to improve the water resistance of asphalt concretes. This promising approach is now undergoing commercial trials. The literature also describes methods of chemically modifying asphalt with maleic anhydride or acrylic acid (14), sulfur trioxide (15), sulfur dioxide (16), acetyl sulfate (17-21), and sulfuric acid (20). (For a recent review of the interfacial phenomena in asphaltic compositions see Ref. 4.)... 

Aliphatic amines and polyamines are bases nearly as weak as ammonia. Alkyl amine hydrochlorides are used rarely now in view of the recognised toxicity. They are known in free or salt form as corrosion inhibitors, flotation collectors and adhesion promoters for asphalt coatings. Acylated polyamines are of interest for the amphoteric biocide synthesis. 

Uses Flotation agent for potash ores corrosion inhibitor germicide wetting agent softener emulsifier intermediate in textiles, water treatment, boiler water treatment, concrete, asphalt, agric. antistat in cosmetics filler dispersant in paper prod. pigment grinding aid/dispersant bitumen adhesion promoter ... 

Fatty amine derivatives act not only as emulsifiers but can also act as adhesion promoters in hot-mix applications. As an adhesion promoter the surfactant is attracted to the surface of the aggregate to provide a more hydrophobic surface for the asphalt to bond to. In some cases it may also displace moisture Ifom the surface of the aggregate. The improved adhesion of the asphalt to the aggregate leads to a stronger and more durable road surface. 

Uses Surfactant detergent additive thickening promoter antistat substantive to most surfs, incl. fabrics, glass, paper, and metals flotation agent for removal of impurities from clay and ores adhesion promoter In asphalt emulsifier In solvent cleaners in add cleaners vise, builder for attapulgite clay In paints/coatings corrosion inhibitor In primers, paints lubricant, corrosion Inhibitor In metals Properties Gardner 10 max. cl. liq. oil-sol. sp.gr. 0.90 g/l amine value 160 90% min. Imidazoline... 

Uses Asphalt emulsifer flm-former adhesion promoter wafer repellent conosion inhibitor automotive polishes car undercoating sound deadeners dye leveling agent... 

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