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US 12,698,430 B2Granted
Coolant with low electrical conductivity
AssigneeBASF SE
InventorsMasayuki Hirosue, Itamar Michael Malkowsky, Uwe Nitzschke, Nina Schindler, Harald Dietl
Life of this patent
Estimating the term…
Abstract
Coolants with low electrical conductivity and corresponding coolant concentrates are useful for cooling systems of vehicles with electric engines, fuel cells, or hybrid engines with a combination of combustion engines with electric engines or a combination of combustion engines with fuel cells.
Claims20
A coolant, comprising:
- (A) at least one glycol,
- (B) water,
- (C) at least one azole derivative,
- (D) at least one ester of orthosilicic acid or alkoxy alkylsilane,
- (E) at least one tertiary amine bearing at least one 2-hydroxyethyl- or 2-hydroxypropyl-group,
- (F) at least one monocarboxylic acid,
- (G) optionally, at least one silicophosphonate, and
- (H) optionally, at least one further coolant additive,
- wherein
- a molar ratio between the at least one tertiary amine (E) and the at least one monocarboxylic acid (F) is from 1:0.1 to 1:0.6, and
- components (C) to (H) are present in amounts so that the coolant exhibits an electrical conductivity of less than 50 μS/cm.
8 more elements
A method of cooling a vehicle, the method comprising:
- adding a coolant into a cooling system of a vehicle with an electric engine, fuel cell, or hybrid engine with a combination of a combustion engine with an electric engine or a combination of a combustion engine with a fuel cell;
- wherein the coolant comprises:
- (A) at least one glycol,
- (B) water,
- (C) at least one azole derivative,
- (D) at least one ester of orthosilicic acid or alkoxy alkylsilane,
- (E) at least one tertiary amine bearing at least one 2-hydroxyethyl- or 2-hydroxypropyl-group,
- (F) at least one monocarboxylic acid,
- (G) optionally, at least one silicophosphonate, and
- (H) optionally, at least one further coolant additive,
- wherein
- a molar ratio between the at least one tertiary amine (E) and the at least one monocarboxylic acid (F) is from 1:0.1 to 1:0.6, and
- components (C) to (H) are present in amounts so that the coolant exhibits an electrical conductivity of less than 50 μS/cm.
10 more elements
Dependencies are inferred from the claim text.