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US 4,537,677 AGranted
Oil emulsions of fluorosilicone fluids
AssigneeDow Corning Corporation
InventorJoseph W. Keil
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Abstract
Emulsions of fluorosilicone fluids in mineral oil are disclosed. These emulsions are stabilized by a polydimethylsiloxane- polybutadiene copolymer or a polydimethylsiloxane-hydrogenated polybutadiene copolymer. The emulsions are an effective foam suppressant for organic liquids, especially crude petroleum.
Claims27
An emulsion comprising, in combination:
- (A) from 0.5 to 90 parts by weight of a fluorosilicone fluid having the average formula
- R.sub.2 "R'SiO(RR"SiO).sub.x SiR.sub.2 "R'
- wherein
- R is a fluoroalkyl radical having the general formula
- (C.sub.m F.sub.2m+1)(CH.sub. 2 CH.sub.2).sub.y,
- m having an average value of 1, 2, 3, or 4,
- y having a value of 1, 2, or 3,
- wherein in said average formula for the fluorosilicone fluid
- x has a value of from 5 to 100,
- R" is a monovalent hydrocarbon radical, and
- R' is selected from the group consisting of OH radicals, R" radicals, and R radicals,
- (B) from 0.1 to 25 parts by weight of a block copolymer selected from the group consisting of polydimethylsiloxane-polybutadiene block copolymers and polydimethylsiloxane-polybutadiene block copolymers in which the polybutadiene block has been wholly or partially hydrogenated;
- and
- (C) from 9 to 89 parts by weight of mineral oil.
11 more elements
A method for suppressing foam in an organic liquid, said method comprising adding to said liquid from 0.1 to 200 parts per million by weight, based on the total weight of the liquid, of an emulsion comprising, in combination:
- (A) from 0.5 to 90 parts by weight of a fluorosilicone fluid having the average formula
- R.sub.2 "R' SiO(RR"SiO).sub.x SiR.sub.2 "R'
- wherein R is fluoroalkyl radical having the general formula
- (C.sub.m F.sub.2m+1)(CH.sub. 2 CH.sub.2).sub.y,
- m having an average value of 1, 2, 3, or 4 and y having a value of 1, 2, or 3,
- wherein in said average formula for the fluorosilicone fluid
- x has a value of from 5 to 100,
- R" is a monovalent hydrocarbon radical, and
- R' is selected from the group consisting of OH radicals, R" radicals, and R radicals.
- (B) from 0.1 to 25 parts by weight of a block copolymer selected from the group consisting of polydimethylsiloxane-polybutadiene block copolymers and polydimethylsiloxane-polybutadiene block copolymers in which the polybutadiene block has been wholly or partially hydrogenated;
- and
- (C) from 9 to 89 parts by weight of mineral oil.
9 more elements
Dependencies are inferred from the claim text.