Compositions – Heat-exchange – low-freezing or pour point – or high boiling... – Organic components
Patent
1977-10-17
1979-07-10
Pitlick, Harris A.
Compositions
Heat-exchange, low-freezing or pour point, or high boiling...
Organic components
252 74, C09K 500
Patent
active
041607406
ABSTRACT:
A coolant comprising water and one of 1-methoxy-2-propanol, 2-methoxy-1-propanol or mixtures thereof, resistant to degradation of fluoroelastomers and which is inhibited against corrosion of ferrous metals, aluminum and solder is disclosed. The desired coolant is prepared by reacting in situ or adding the reaction product of one or more phosphoric acids and an inorganic base selected from potassium hydroxide, sodium hydroxide or mixtures thereof, and optionally contains, as a copper or brass deactivator mercaptobenzothiazole, a benzotriazole, a sodium or potassium salt of mercaptobenzothiazole or a benzotriazole, or mixtures of these, wherein the pH of the coolant is adjusted to between about 6 and about 9 by balancing the relative amounts of phosphoric acids and inorganic bases to attain said pH. For example, about 53 parts 1-methoxy-2-propanol, 46 parts water, 0.8 parts K.sub.2 HPO.sub.4, 0.1 part orthophosphoric acid and 0.1 part sodium tolutriazole yield a coolant of about pH 8 which gives low corrosion of metals commonly employed in cooling systems and does not induce excessive swelling or cracking and crazing of fluoroelastomers.
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patent: 3935125 (1976-01-01), Jacob
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Miller, "Methoxy Propanol Automotive Antifreeze", Soap & Chemical Specialties, Oct. 1967, pp. 68, 70, 72, 76, 212, 213.
Fifield David H.
Pitlick Harris A.
The Dow Chemical Company
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