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US 5,670,087 AGranted
Method of preparing HIPR bituminous emulsions
AssigneeIntevep, S.A.
InventorsMaria Luisa Chirinos, Alistair Stewart Taylor, Spencer Edwin Taylor
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AssigneeIntevep, S.A.
InventorsMaria Luisa Chirinos, Alistair Stewart Taylor, Spencer Edwin Taylor
Estimating the term…
An HIPR emulsion of bitumen in water is prepared by a method which comprises directly mixing 70 to 98% by volume of bitumen having a viscosity in the range 200 to 500,000 mPa.s at the mixing temperature with 30 to 2% by volume of an aqueous solution of an emulsifying surfactant, percentages being expressed as percentages by volume of the total mixture. Mixing is effected under low shear conditions in the range 10 to 1,000 reciprocal seconds in such manner that an emulsion is formed comprising highly distorted bitumen droplets having mean droplet diameters in the range 2 to 50 micron separated by thin films of water. The emulsions can be cut back to provide stable emulsions of lower bitumen content which are useful in road-making and the formation of protective coatings.
A method for the preparation of a high internal phase ratio emulsion having a high degree of monodispersity of bitumen in water, the method consisting essentially of directly mixing 70 to 98% by weight of bitumen with 30 to 2% by weight of an aqueous solution of an emulsifying surfactant, percentages being expressed as percentages by weight of the total mixture;
A method for the preparation of a high internal phase ratio emulsion having a high degree of monodispersity of bitumen in water, the method consisting essentially of directly mixing 70 to 98% by weight of bitumen with 30 to 2% by weight of an aqueous solution of an emulsifying surfactant, percentages being expressed as percentages by weight of the total mixture;
A method for the preparation of a high internal phase ratio emulsion having a high degree of monodispersity of bitumen in water, the method consisting essentially of directly mixing 70 to 98% by weight of bitumen with 30 to 2% by weight of an aqueous solution of an emulsifying surfactant, percentages being expressed as percentages by weight of the total mixture;
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