Hard water compatible phosphate-containing heat transfer fluids

Details Hard water compatible phosphate-containing heat transfer fluids Hard water compatible phosphate-containing heat transfer fluids

1996-09-12

1998-06-16

Skane, Christine

Compositions

Heat-exchange, low-freezing or pour point, or high boiling...

Organic components

252 75, 252 79, 252180, 252181, 210698, 210701, C09K 500, C02F 510

Patent

active

057665060

ABSTRACT:
A heat transfer fluid is disclosed which comprises a glycol, a phosphate, and a copolymer additive which is a copolymer of an ethylenically substituted carboxylic acid and an aldehyde. A method for preparing the heat transfer fluid comprises admixing 92 to 96 weight percent of one or more glycols; 2 to 4 weight percent of a phosphate; and 0.01 to 0.25 weight percent of the copolymer additive. Precipitation of phosphate salts is inhibited in phosphate-containing glycol-based fluids by the addition of the copolymer additive before mixing the fluid with water.

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