GB770486A - Anti-foaming compositions - Google Patents
Anti-foaming compositionsInfo
- Publication number
- GB770486A GB770486A GB3904/55A GB390455A GB770486A GB 770486 A GB770486 A GB 770486A GB 3904/55 A GB3904/55 A GB 3904/55A GB 390455 A GB390455 A GB 390455A GB 770486 A GB770486 A GB 770486A
- Authority
- GB
- United Kingdom
- Prior art keywords
- glycol
- ether
- siloxane
- glycols
- per cent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
- B01D19/0409—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance compounds containing Si-atoms
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Dispersion Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Silicon Polymers (AREA)
Abstract
Dimethyl silicon or siloxane esters of a propylene glycol, ethylene glycol, or of lower monoalkyl ether of these glycols, are prepared by esterification of a dimethylpolysiloxane with a glycol or polyglycol, trans-esterification of an alkoxydimethylsilane with a glycol or polyglycol, or esterification of dimethyl-chlorosilane with a glycol or polyglycol. Glycols and ethers which may be esterified are the monomethyl ether or monobutyl ether of ethylene glycol, the monoethyl ether of propylene glycol, dipropylene glycol, triethylene glycol, and pentapropylene glycol. In examples: (a) dimethyl siloxane cyclic tetramer is equilibrated with a propylene glycol by heating in the presence of sodium hydroxide catalyst; (b) dimethyldichlorosilane is esterified with ethylene glycol; (c) an ester of the formula (CH3)2 Si[OCH2CH2OCH3]2 is prepared. The esters are useful as antifoaming agents (see Group III).ALSO:An anti-foaming composition, useful as an antifreeze solution consists essentially of an aqueous solution of a glycol or of an aliphatic monohydric alcohol having less than four carbon atoms in the molecule, containing as anti-foaming agent a dimethyl silicon or siloxane ester of a propylene glycol, ethylene gycol, or of a lower monoalkyl ether of these glycols. The solution contains at least 0.001 per cent by weight (preferably at least 0.01 per cent) of the dimethyl silicon or siloxane units and the anti-foaming agent may contain 5-95 mol per cent of dimethyl silicon or siloxane units and 95-5 mol per cent of units of the residue of the glycol or ether. Suitable glycols or alcohols for forming the aqueous solution are ethylene glycol, propylene glycol, methanol, ethanol, n-propanol, isopropanol, and mixtures thereof. The solution may also contain inhibitors of rust or oxidation.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US770486XA | 1954-03-19 | 1954-03-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB770486A true GB770486A (en) | 1957-03-20 |
Family
ID=22135768
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3904/55A Expired GB770486A (en) | 1954-03-19 | 1955-02-09 | Anti-foaming compositions |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR1120946A (en) |
GB (1) | GB770486A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1104762B (en) * | 1958-12-02 | 1961-04-13 | Union Carbide Corp | Antifreeze |
DE1104763B (en) * | 1958-12-02 | 1961-04-13 | Union Carbide Corp | Antifreeze |
EP0029728A1 (en) * | 1979-11-23 | 1981-06-03 | The Dow Chemical Company | Glycol compositions containing an ether modified silicone |
CN111763550A (en) * | 2020-06-17 | 2020-10-13 | 广东三和控股有限公司 | Brake fluid and preparation method thereof |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4462921A (en) * | 1983-01-24 | 1984-07-31 | Texaco Inc. | Siloxane stabilizers for inorganic silicates in antifreeze/coolant formulations |
-
1955
- 1955-02-09 GB GB3904/55A patent/GB770486A/en not_active Expired
- 1955-03-18 FR FR1120946D patent/FR1120946A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1104762B (en) * | 1958-12-02 | 1961-04-13 | Union Carbide Corp | Antifreeze |
DE1104763B (en) * | 1958-12-02 | 1961-04-13 | Union Carbide Corp | Antifreeze |
EP0029728A1 (en) * | 1979-11-23 | 1981-06-03 | The Dow Chemical Company | Glycol compositions containing an ether modified silicone |
CN111763550A (en) * | 2020-06-17 | 2020-10-13 | 广东三和控股有限公司 | Brake fluid and preparation method thereof |
Also Published As
Publication number | Publication date |
---|---|
FR1120946A (en) | 1956-07-17 |
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