Cationic Slow-set emulsifiers containing nonionic surfactants can have quality issues when used with some SBR latex grades. The emulsions produced using nonionic based emulsifiers have a tendency towards large particle size.

Redicote E-11 shows good latex compatibility but the slow set emulsion formed, although meeting cement mix requirements, is sometimes too reactive for applications such as cold mix and slurry surfacing using reactive aggregates.

Tony Ng at the Dobbs Ferry R&D laboratory has shown that combinations of Redicote E-7000 and Redicote E-11 form slower-set emulsions than Redicote E-11 while providing excellent latex compatibility, and a level of adhesion on siliceous aggregates superior to other ultra stable emulsion recipes. In a slurry surfacing mix with reactive aggregate, the new emulsion recipe showed long mix time but good cohesion development. Like Redicote E-11emulsions, mix time is extended by the use of lime or cement filler. In the presence of lime or cement the emulsion formed using both Redicote E-11 and Redicote E-7000 provides more mix time than Redicote E-4868 or Redicote E-11. In the absence of cement the mix time is somewhat shorter than Redicote E-4868 but longer than Redicote E-11.

Redicote E-11 and E-7000 are both low viscosity liquid, water-soluble products, which means that they are much easier to use than other slow set or quick-set emulsifiers. The mixed emulsifier system can be used without pH adjustment, or the pH can be reduced with hydrochloric acid. The recipe can be used with or without latex.

The emulsions formed are characterized by very small particle size, good latex compatibility and excellent adhesion on siliceous aggregates - far superior to emulsions formed using conventional CSS emulsifiers. The emulsions also clearly pass the particle charge test.