Method for preparing silicon-sulfur compounds and their use in bitiminous compositions
A method of producing sulfur modified organosilane compounds that can be used in asphalt binders which method involves: combining together an organosilane or mixtures of organosilanes, a sulfide, a halogen acceptor and solvent to form a reaction mixture; and allowing the organosilane to react with the sulfide in the presence of a halogen acceptor to produce a sulfur modified organosilane compound. The sulfur modified organosilane compound can be introduced into a polymer modified or unmodified asphalt binder in which the sulfur modified organosilane compound reacts with components in the asphalt mixture to form a modified asphalt. The organosilanes used to produce the sulfur modified organosilanes can be from a source of waste products (such as Direct Product Residue) in which case the waste products can be reused in asphalt binders.
1. A method of producing a polymer-modified asphalt composition which method involves the steps of:
a) combining together an organosilane, or a mixture of organosilanes, a sulfide, a halogen acceptor, a solvent to form a reaction mixture;
b) allowing the organosilane to react with the sulfide in the presence of a halogen acceptor to generate the sulfur containing organosilane; and
c) introducing the sulfur containing organosilane to an asphalt binder as an additive and/or as a crosslinking agent.
2. A method of producing a modified asphalt composition according to claim 1 , wherein the modified asphalt has enhanced rheological properties.
3. A method of producing a modified asphalt composition according to claim 1 , wherein the sulfur containing organosilane functions as a crosslinking agent in the asphalt binder.
4. A method of producing a modified asphalt composition according to claim 1 , wherein the solvent is asphalt.
5. A method of producing a modified asphalt composition according to claim 1 , where an additional crosslinking agent is added.
6. A method of producing a modified asphalt composition according to claim 1 , which further comprises incorporating the modified asphalt composition into at least one of a pavement, a roofing material and a waterproofing composition.
7. A method of producing a modified asphalt composition according to claim 2 , which further comprises incorporating the modified asphalt composition into at least one of a pavement, a roofing material and a waterproofing composition.
8. A method of producing a modified asphalt composition according to claim 3 , which further comprises incorporating the modified asphalt composition into at least one of a pavement, a roofing material and a waterproofing composition.
9. A method of producing a modified asphalt composition according to claim 4 , which further comprises incorporating the modified asphalt composition into at least one of a pavement, a roofing material and a waterproofing composition.
10. A method of producing a modified asphalt composition according to claim 5 , which further comprises incorporating the modified asphalt composition into at least one of a pavement, a roofing material and a waterproofing composition.
11. A method of producing a modified asphalt composition according to claim 1 wherein the organosilane is obtained from a source of waste organosilanes.
12. A method of producing a modified asphalt composition according to claim 11 , wherein the source of waste organosilanes comprises byproducts from a Direct Process for making chlorosilanes.