Coolant composition for fuel cell
A coolant composition for a fuel cell, including (a) an alkylene glycol, (b) deionized water, and (c) a compound containing a trimethylsilyl group. The compound containing a trimethylsilyl group of the composition of the present invention prevents the oxidation of the alkylene glycol, and thus the generation of an acid is 700 ppm or less. Additionally, the compound prevent the oxidation of the alkylene glycol, thereby inhibiting the generation of an ionic material, and thus the rate of change of electrical conductivity (conductivity after oxidation/initial conductivity) can be maintained to be 40 times or less. Therefore, the coolant composition for a fuel cell of the present invention can be used as a coolant for a cooling system of a fuel cell driving device with an electrical conductivity of 40 μs/cm or less even without being frozen in the winter.
1. A coolant composition for a fuel cell, comprising:
(a) alkylene glycol;
(b) deionized water; and
(c) a compound represented by the following Formula I:
wherein R 1 is halo, C 1-10 alkyl, —NR 2 R 3 , azide, C 1-10 alkaneamide,
where each of R 2 , R 3 , R 4 , and R 5 is independently oxygen or C 1-10 alkyl.
2. The composition according to claim 1 , wherein alkylene glycol is selected from the group consisting of monoethylene glycol, monopropylene glycol, diethylene glycol, dipropylene glycol, glycerin, triethylene glycol and tripropylene glycol.
3. The composition according to claim 1 , wherein R 1 is halo, C 1-5 alkyl, —NR 2 R 3 , azide, C 1-5 alkaneamide,
where each of R 2 , R 3 , R 4 , and R 5 is independently oxygen or C 1-5 alkyl.
4. The composition according to claim 3 , wherein R 1 is halo, C 1-3 alkyl, —NR 2 R 3 , azide, C 1-3 alkaneamide,
where each of R 2 , R 3 , R 4 , and R 5 is independently oxygen or C 1-3 alkyl.
5. The composition according to claim 4 , wherein the compound is trimethylsilyl bromide; trimethylsilyl chloride; trimethylsilyl azide; trimethylsilyl methyester; trimethylsilyl amine; trimethylsilyl dimethylamine; trimethylsilyl diethylamine; N-trimethylsilyl acetamide; or N,O-bis(trimethylsilyl)acetamide.
6. The composition according to claim 5 , wherein the compound is N,O-bis(trimethylsilyl)acetamide or N-trimethylsilyl acetamide.
7. The composition according to claim 1 , wherein the composition comprises 30-60% by weight of the alkylene glycol, 35-65% by weight of the deionized water and 0.001-5% by weight of the compound represented by the Formula I based on the total weight of the composition.
8. The composition according to claim 1 , wherein the compound prevents the oxidation of alkylene glycol to keep the fluctuation rate of electrical conductivity (post-oxidation conductivity/initial conductivity) below 40-folds.
9. The composition according to claim 8 , wherein the compound prevents the oxidation of alkylene glycol to keep the fluctuation rate of electrical conductivity for graphite-based bipolar plate (post-oxidation conductivity/initial conductivity) below 40-folds.
10. The composition according to claim 8 , wherein the compound prevents the oxidation of alkylene glycol to keep the fluctuation rate of electrical conductivity for aluminum (post-oxidation conductivity/initial conductivity) below 20-folds.
11. The composition according to claim 1 , wherein the composition is used as a coolant for a cooling system of a fuel cell driving device with below 40 μs/cm of an electrical conductivity.
12. A method of protecting a fuel cell from oxidation of alkylene glycol, comprising:
applying to the fuel cell a coolant composition comprising alkylene glycol, deionized water, and a compound represented by the following Formula I:
wherein R 1 is halo, C 1-10 alkyl, —NR 2 R 3 , azide, C 1-10 alkaneamide,
where each of R 2 , R 3 , R 4 , and R 5 is independently oxygen or C 1-10 alkyl.
13. The method according to claim 12 , wherein alkylene glycol is selected from the group consisting of monoethylene glycol, monopropylene glycol, diethylene glycol, dipropylene glycol, glycerin, triethylene glycol and tripropylene glycol.
14. The method according to claim 12 , wherein R 1 is halo, C 1-5 alkyl, —NR 2 R 3 , azide, C 1-5 alkaneamide,
where each of R 2 , R 3 , R 4 , and R 5 is independently oxygen or C 1-5 alkyl.
15. The method according to claim 14 , wherein R 1 is halo, C 1-3 alkyl, —NR 2 R 3 , azide, C 1-3 alkaneamide,
where each of R 2 , R 3 , R 4 , and R 5 is independently oxygen or C 1-3 alkyl.
16. The method according to claim 15 , wherein the compound is trimethylsilyl bromide; trimethylsilyl chloride; trimethylsilyl azide; trimethylsilyl methyester; trimethylsilyl amine; trimethylsilyl dimethylamine; trimethylsilyl diethylamine; N-trimethylsilyl acetamide; or N,O-bis(trimethylsilyl)acetamide.
17. The method according to claim 16 , wherein the compound is N,O-bis(trimethylsilyl)acetamide or N-trimethylsilyl acetamide.
18. The method according to claim 12 , wherein the composition comprises 30-60% by weight of the alkylene glycol, 35-65% by weight of the deionized water and 0.001-5% by weight of the compound represented by the Formula I based on the total weight of the composition.
19. The method according to claim 12 , wherein the compound prevents the oxidation of alkylene glycol to keep the fluctuation rate of electrical conductivity (post-oxidation conductivity/initial conductivity) below 40-folds.
20. The method according to claim 19 , wherein the compound prevents the oxidation of alkylene glycol to keep the fluctuation rate of electrical conductivity for graphite-based bipolar plate (post-oxidation conductivity/initial conductivity) below 40-folds.
21. The method according to claim 19 , wherein the compound prevents the oxidation of alkylene glycol to keep the fluctuation rate of electrical conductivity for aluminum (post-oxidation conductivity/initial conductivity) below 20-folds.
22. The method according to claim 12 , wherein the composition is used as a coolant for a cooling system of a fuel cell driving device with below 40 μs/cm of an electrical conductivity.