Defoamer formulation
View Patent ↗Formulation comprising hydrophobicized particles of silicon dioxide, mineral oil and one or more emulsifiers, where the hydrophobicized silicon dioxide is a fumed silicon dioxide, possesses a BET surface area of 200 to 300 m 2 /g, has on the surface of the particles O—Si—(C n H 2n+1 ) 3 groups, where n is 1 to 3 and where the (C n H 2n+1 ) units are alike or different, has a carbon content of 1.5% to 5% by weight, based on the hydrophobic silicon dioxide, and is present in the formulation with a fraction of 0.05% to 5% by weight.
1. A formulation consisting of hydrophobicized particles of silicon dioxide, mineral oil and one or more emulsifiers,
wherein
the hydrophobicized particles of silicon dioxide
are fumed,
possesses a BET surface area of 200 to 300 m 2 /g,
have on the surface of the particles O—Si—(C n H 2n+1 ) 3 groups, where n is 1 to 3 and where the (C n H 2n+1 ) units are alike or different,
have a carbon content of 1.5% to 5% by weight, based on the hydrophobicized particles of silicon dioxide, and
are present in the formulation in an amount of from 0.05% to 5% by weight, based on the total weight of the formulation,
wherein the formulation comprises:
40% to 90% by weight, based on the total weight of the formulation, of the mineral oil, and
2% to 25% by weight, based on the total weight of the formulation, of the emulsifier.
2. The formulation according to claim 1 , wherein n is 1.
3. The formulation according to claim 1 , wherein the BET surface area is 230 to 290 m 2 /g.
4. The formulation according to claim 1 , wherein the carbon content is 2% to 5%, based on the hydrophobicized particles of silicon dioxide.
5. The formulation according to claim 1 , wherein the fraction of hydrophobicized silicon dioxide is 0.1% to 1% by weight, based on the formulation.
6. The formulation according to claim 1 , wherein the BET surface area is 250 to 270 m 2 /g.
7. The formulation according to claim 1 , wherein the carbon content is 2% to 3% by weight, based on the hydrophobicized particles of silicon dioxide.
8. The formulation according to claim 1 , which contains 0.1% to 0.5% by weight of the hydrophobicized particles of silicon dioxide, based on the total weight of the formulation.
9. The formulation according to claim 1 , wherein the (C n H 2n+1 ) units are alike.
10. The formulation according to claim 1 , wherein the (C n H 2n+1 ) units are different.
11. The formulation according to claim 1 , wherein the carbon content is 2% to 3% by weight, based on the hydrophobicized particles of silicon dioxide.
12. A composition comprising the formulation according to claim 1 and at least one acrylic ester.
13. A method of defoaming aqueous systems comprising adding the formulation according to claim 1 to an aqueous polymeric system comprising an acrylic ester.