System and method for pre-treatment of rubber-modified asphalt cement, and emulsions thereof
This invention encompasses asphalt cement emulsions, as well as methods for preparing a pre-treated rubber-modified asphalt cement emulsions and methods for coating industrial surfaces using asphalt cement emulsions.
1. An asphalt cement emulsion composition, comprising:
i) a rubber-modified asphalt cement;
ii) an emulsifier, comprising a diamine compound; and
iii) an aqueous emulsification solution, comprising about 0.1 to 10 wt. % of clay relative to the total weight of the emulsion composition;
wherein the emulsion composition comprises about 10-55 wt. % of solids, relative to the total weight of the emulsion composition.
2. The emulsion composition of claim 1 , wherein the clay is a hydrophobic clay.
3. The emulsion composition of claim 1 , wherein the clay is sepiolite clay.
4. The emulsion composition of claim 1 , wherein the rubber-modified asphalt cement comprises one or more additives, comprising a thickener, an anti-foam agent, a polymer latex, a sulfonic acid, or a surfactant.
5. The emulsion composition of claim 1 , wherein the composition comprises from about 9 to 13 wt. % of rubber, relative to the total wt. % of the rubber-modified asphalt cement.
6. The emulsion composition of claim 1 , wherein the composition further comprises one or more emulsifiers.
7. The emulsion composition of claim 6 , wherein the one or more emulsifiers comprises one or more amine-containing compounds.
8. The emulsion composition of claim 7 , wherein the one or more amine-containing compounds comprises a monoamine compound.
9. The emulsion composition of claim 8 , wherein the monoamine compound comprises an amine oxyalkylate compound.
10. The emulsion composition of claim 6 , wherein the one or more emulsifiers comprises one or more aromatic hydrocarbon compounds.
11. The emulsion composition of claim 6 , wherein the one or more emulsifiers comprises a carboxylic acid.
12. The emulsion composition of claim 6 , wherein the one or more emulsifiers comprises a tall oil compound or derivative.
13. The emulsion composition of claim 6 , wherein the one or more emulsifiers comprises at least one of the following, relative to the total weight of the emulsion composition:
i) from about 30 to 50 wt. % of the diamine compound;
ii) from about 20 to 40 wt. % of an amine oxyalkylate compound;
iii) from about 15 to 25 wt. % of a carboxylic acid compound;
iv) from about 5 to 10 wt. % of one or more aromatic hydrocarbon compounds; and
v) from about 5 to 10 wt. % of a tall oil compound.
14. The emulsion composition of claim 1 , wherein the aqueous emulsification solution comprises one or more surfactants.
15. The emulsion composition of claim 14 , wherein the one or more surfactants comprises a non-ionic surfactant, a cationic surfactant, or an anionic surfactant.
16. The emulsion composition of claim 14 , wherein the one or more surfactants comprises a surfactant that includes dodedcyl benzenesulfonic acid.
17. The emulsion composition of claim 15 , wherein the non-ionic surfactant comprises ethylhexanol.
18. The emulsion composition of claim 1 , wherein less than about 0.5 wt. % of the emulsion composition, relative to the total weight of the emulsion composition, remains on a 850-um mesh sieve following contact of the sieve with the emulsion composition during the Sieve Emulsion Test.
19. The emulsion composition of claim 1 , wherein the emulsion composition is prepared by:
a) preparing a pre-treatment mixture, comprising:
i) a rubber-modified asphalt cement; and
ii) one or more emulsifiers, comprising a diamine compound;
b) preparing an aqueous emulsification solution comprising clay; and
c) contacting the prepared pre-treatment mixture with the prepared aqueous emulsification solution.
20. The emulsion composition of claim 1 , wherein the emulsion composition comprises about 1 to 7 wt. % of clay relative to the total weight of the emulsion composition.