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US 8,617,416 B1Granted
Heat transfer fluids and corrosion inhibitor formulations for use thereof
AssigneePrestone Products Corporation
InventorsBo Yang, Aleksei V. Gershun, Peter M. Woyciesjes
Life of this patent
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Abstract
Disclosed herein is a heat transfer fluid concentrate comprising: greater than or equal to 90 weight percent of a freezing point depressant; 16 to 80 ppm of magnesium ions; an azole compound; an inorganic phosphate; a carboxylate; and an acrylate based polymer, wherein the heat transfer fluid concentrate has a pH of 7-9.5 and the weight ratio of acrylate based polymer to magnesium ions is 1 to 25. The heat transfer fluid concentrate can be used to make a heat transfer fluid.
Claims12
A heat transfer fluid concentrate comprising:
- greater than 90 weight percent of a freezing point depressant;
- 16 to 80 ppm of magnesium ions;
- an azole compound;
- an inorganic phosphate;
- a carboxylate;
- and
- an acrylate based polymer,
- wherein the heat transfer fluid concentrate has a pH of 7 to 9.5 and is free of silicate, borate, and amines, and
- wherein the weight ratio of acrylate based polymer to magnesium ions is 1 to 25.
6 more elements
A heat transfer fluid comprising:
- less than 90 weight percent of a freezing point depressant;
- 2 to 60 ppm of magnesium ions;
- an azole compound;
- an inorganic phosphate;
- a carboxylate;
- greater than 0.5 ppm of calcium ions;
- and
- an acrylate based polymer,
- wherein the heat transfer fluid has a pH of 7 to 9.5 and is free of silicate, borate, and amines, and
- wherein and the weight ratio of acrylate based polymer to magnesium ions is 1 to 25.
7 more elements
Dependencies are inferred from the claim text.