Silicate-, borate-and phosphate-free cooling fluids based on glycols and having improved corrosion behavior
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United States of America Patent
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Oct 30, 2001
Grant Date -
N/A
app pub date -
Jun 30, 2000
filing date -
Jul 2, 1999
priority date (Note) -
Expired
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Abstract
The invention relates to a coolant concentrate comprising a) from 0.1 to 6% by weight of at least one monocarboxylic and/or dicarboxylic acid having from 4 to 16 carbon atoms in the form of alkali metal salts, b) from 0.02 to 2% by weight of a triazinetriiminocarboxylic acid in the form of its alkali metal salt, c) from 0.02 to 2% by weight of at least one hydrocarbon triazole, d) from 0.01 to 1% by weight of at least one soluble alkaline earth metal salt, e) if desired, up to 4% by weight of water, and f) glycols to 100% by weight, in each case based on the total weight of the concentrate.
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