GB770486A - Anti-foaming compositions - Google Patents

Anti-foaming compositions

Info

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
Application number
GB3904/55A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Midland Silicones Ltd
Original Assignee
Midland Silicones Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Midland Silicones Ltd filed Critical Midland Silicones Ltd
Publication of GB770486A publication Critical patent/GB770486A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D19/00Degasification of liquids
    • B01D19/02Foam dispersion or prevention
    • B01D19/04Foam dispersion or prevention by addition of chemical substances
    • B01D19/0404Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
    • B01D19/0409Foam 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.
GB3904/55A 1954-03-19 1955-02-09 Anti-foaming compositions Expired GB770486A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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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