Fuel cell coolant, method for producing the same, and use thereof

Abstract

The present application relates to the field of fine chemical industry, in particular to a fuel cell coolant, a preparation method and application thereof.The fuel cell coolant comprises N,N,N-trimethylglycine and water, and the conductivity is 0 muS / cm-5 muS / cm; the fuel cell coolant comprises N,N,N-trimethylglycine, water and non-ionic corrosion inhibitor, and the conductivity is 0 muS / cm-5 muS / cm.The non-ionic corrosion inhibitor is selected from one or more of lipid compounds, azole compounds and amide compounds, and the total mass of the above non-ionic corrosion inhibitor in the fuel cell coolant is ≯2%.The hydrogen fuel cell coolant has excellent antifreezing performance, low conductivity and metal ion inhibition, and is compatible with proton membranes, and is applied to hydrogen fuel cell engines.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fine chemical technology, in particular to a hydrogen fuel cell cooling liquid and a preparation method and application thereof, and particularly relates to a fuel cell cooling liquid with excellent antifreezing, low conductivity and excellent compatibility with sulfonic acid groups of a proton exchange membrane. BACKGROUND

[0002] A hydrogen fuel cell is a device that directly converts hydrogen and oxygen into electricity through an electrochemical reaction. It has the characteristics of high conversion efficiency and the product is only electricity, heat and water. The hydrogen fuel cell generates a large amount of heat, which must be cooled by a cooling medium to ensure the use performance and service life of the hydrogen fuel cell. The cooling medium is brought into the bipolar plate to take away the heat generated by the hydrogen fuel cell. Since the cooling medium is in direct contact with the bipolar plate, the cooling liquid must maintain a low conductivity to prevent power loss in the fuel cell. Generally, the cooling medium of the hydrogen fuel cell engine temperature control system requires excellent insulation, and its conductivity is less than 5 μS / cm.

[0003] In order to maintain the low conductivity of the cooling medium, high-purity water is often used in the past, but high-purity water has no antifreezing function and will freeze when the air temperature is lower than 0℃ and the fuel cell vehicle is in a stop state, which may cause the hydrogen fuel cell engine to crack.

[0004] In order to solve the antifreezing and low conductivity requirements of the cooling medium for the fuel cell, different technical solutions are adopted by manufacturers and research institutions to solve the antifreezing and low conductivity problems of the cooling liquid for the fuel cell, and corresponding patents are applied for.

[0005] Chinese patent CN109148915 discloses a fuel cell cooling liquid, the main components of which are ethylene glycol, triethanolamine, alkyl diethanolamide, phosphoric acid triester, triazole compound, defoaming agent and deionized water, which has antifreezing and anticorrosion functions. The use of triethanolamine itself will increase the conductivity. The antifreezing agent selected is ethylene glycol, which solves the problem of antifreezing of the fuel cell cooling liquid.

[0006] US patent US8187763 discloses a coolant composition for fuel cell units, which comprises at least one fatty alcohol having an unsaturated bond in each molecule having 2 to 20 carbon atoms, which solves the problem of oxidation of ethylene glycol in the coolant, so as to ensure that the conductivity of the coolant composition is kept at 10 uS / cm or less. The cooling liquid has no anticorrosion effect and cannot inhibit the precipitation of metal ions. The antifreezing agent selected is ethylene glycol, which solves the problem of oxidation of ethylene glycol.

[0007] US 20040086757 discloses a fuel cell and fuel cell coolant composition, which is composed of deionized water, freezing point depressant, polymer ion inhibitor and organic corrosion inhibitor, etc., to ensure the low conductivity characteristics of the coolant, and the antifreeze selected from glycerol, ethylene glycol, propylene glycol, 1,3-butanediol, ethylene glycol ether, diacetone alcohol and ethanol.

[0008] The above patents all use one or more of ethylene glycol, propylene glycol, glycerol, ethanol, etc. as antifreeze to solve the problem of antifreeze of fuel cell coolant, but the fuel cell stack encounters a more urgent problem: once the coolant leaks to the core component of the fuel cell-proton membrane, it will directly affect the safety and performance of the stack, causing the proton membrane to be poisoned. The basic principle is that the high electronegativity of fluorine atoms in perfluorosulfonic acid proton exchange membrane pulls the electron cloud of sulfonate, which greatly enhances the dissociation ability of sulfonate on the branched chain of perfluorosulfonic acid proton exchange membrane in water, thereby promoting the hydrogen ion conduction ability of the structure. The antifreeze such as ethylene glycol in the fuel cell will react with the sulfonate on the proton membrane to cause the sulfonate on the proton membrane to lose the ability to conduct hydrogen ions.

[0009] In summary, hydrogen fuel cells have more stringent requirements for coolants, especially the toxic effects on proton membrane sulfonic groups, and it is necessary to propose a new solution for hydrogen fuel cell coolant to solve the problem of hydrogen fuel cell thermal management system for coolant antifreeze, corrosion prevention, ion inhibition and compatibility with proton membrane. SUMMARY

[0010] In view of the deficiencies in the prior art, the purpose of the present application is to provide a hydrogen fuel cell coolant with excellent antifreeze performance, low conductivity, metal ion inhibition performance, and excellent compatibility with proton membrane, as well as a preparation method and application thereof.

[0011] In order to achieve this object, the technical solution of the present application is as follows:

[0012] 1) A fuel cell coolant, characterized in that it comprises N,N,N-trimethyl glycine and water, and the conductivity is 0 μS / cm to 5 μS / cm;

[0013] 2) The fuel cell coolant, characterized in that it comprises N,N,N-trimethyl glycine, water and non-ionic corrosion inhibitor, and the conductivity is 0 μS / cm to 5 μS / cm;

[0014] 3) The fuel cell coolant, characterized in that the mass ratio of N,N,N-trimethyl glycine to water is 10:90 to 60:40, and preferably the mass ratio of N,N,N-trimethyl glycine to water is 20:80 to 50:50;

[0015] 4) The fuel cell coolant, characterized in that the non-ionic corrosion inhibitor is one or more of ester compounds, azole compounds, and amide compounds, and the content is ≤2% of N,N,N-trimethylglycine and water;

[0016] 5) The fuel cell coolant, characterized in that the non-ionic compound is one or more of dextrin, phosphate ester, borate ester, methyl benzotriazole, benzotriazole and its derivatives, and carbonic acid amide;

[0017] 6) The fuel cell coolant, characterized in that the content of the dextrin is ≤0.2% of N,N,N-trimethylglycine and water; the content of the methyl benzotriazole is ≤1.0% of N,N,N-trimethylglycine and water; the content of the borate ester is ≤0.1% of N,N,N-trimethylglycine and water; the content of the phosphate ester is 0.002%-0.2% of N,N,N-trimethylglycine and water; and the content of the carbonic acid amide is ≤0.01% of N,N,N-trimethylglycine and water;

[0018] 7) The fuel cell coolant, characterized in that the resistivity of the deionized water is not less than 18 MΩ·cm.

[0019] The present application is directed to the multiple requirements of low conductivity, metal ion inhibition, and antifreezing of the fuel cell engine, and more importantly, the actual problems such as poisoning and failure of the proton membrane caused by the leakage of the coolant. A plurality of antifreezing agents are screened, and a large number of multi-dimensional tests and formula screening are carried out. The present application determines the optimal ratio of N,N,N-trimethylglycine and water, and further determines the optimal selection of N,N,N-trimethylglycine, water, and non-ionic inhibitors. Not only is the compatibility of N,N,N-trimethylglycine and water excellent, but also the compatibility of the screened non-ionic inhibitors with the proton membrane is excellent. On this basis, through optimization of the ratio, a synergistic effect is generated, which not only has low conductivity but also improves the metal ion inhibition performance.

[0020] In order to further improve the compatibility with the proton membrane, low conductivity, and metal ion inhibition performance of the fuel cell coolant, the present application explores the amount of each component in the above fuel cell coolant, and determines the suitable ratio, which is as follows:

[0021] The fuel cell coolant comprises the following components by weight:

[0022] N,N,N-trimethylglycine 100-600 parts deionized water 400-900 parts; nonionic corrosion inhibitor 0-20 parts

[0023] Preferably, the fuel cell coolant comprises the following components by weight:

[0024] N,N,N-trimethylglycine 100-600 parts deionized water 400-900 parts; dextrin 0-2 parts methylbenzotriazole 0-10 parts borate ester 0-1 part phosphate ester 0.02-2 parts carbonic acid amide 0-0.1 part

[0025] As a preferred specific scheme, the fuel cell coolant of the present application comprises the following components by weight:

[0026] N,N,N-trimethylglycine 100 parts deionized water 900 parts;

[0027] or,

[0028] N,N,N-trimethylglycine 600 parts deionized water 400 parts;

[0029] or,

[0030] N,N,N-trimethylglycine 500 parts deionized water 400 parts;

[0031] or,

[0032] N,N,N-trimethylglycine 100 parts dextrin 0.02 parts methylbenzotriazole 0.1 part borate ester 0.01 part phosphate ester 0.02 part carbonic acid amide 0.001 part deionized water 900 parts;

[0033] or,

[0034] N,N,N-trimethylglycine 600 parts dextrin 0.02 parts methylbenzotriazole 0.1 part borate ester 0.01 part phosphate ester 0.02 part carbonic acid amide 0.001 part deionized water 400 parts;

[0035] or,

[0036] N,N,N-trimethylglycine 500 parts dextrin 0.02 parts methylbenzotriazole 0.1 part borate ester 0.01 part phosphate ester 0.02 part carbonic acid amide 0.001 part deionized water 500 parts;

[0037] or,

[0038] N,N,N-trimethylglycine 500 parts dextrin 0.2 parts methylbenzotriazole 1 part borate ester 0.1 part phosphate ester 0.2 part carbonic acid amide 0.01 part deionized water 500 parts;

[0039] or,

[0040] N,N,N-trimethylglycine 500 parts dextrin 2 parts methylbenzotriazole 10 parts borate ester 1 part phosphate ester 2 parts carbonic acid amide 0.1 part deionized water 500 parts;

[0041] or,

[0042] N,N,N-trimethylglycine 500 parts methylbenzotriazole 1 part borate ester 0.1 part phosphate ester 0.2 part carbonic acid amide 0.01 part deionized water 500 parts;

[0043] or,

[0044] N,N,N-trimethylglycine 500 parts dextrin 0.2 parts borate ester 0.1 part phosphate ester 0.2 part carbonic acid amide 0.01 part deionized water 500 parts;

[0045] or,

[0046] N,N,N-trimethylglycine 500 parts dextrin 0.2 parts methylbenzotriazole 1 part phosphate ester 0.2 part carbonic acid amide 0.01 part deionized water 500 parts.

[0047] or,

[0048] N,N,N-trimethylglycine 500 parts dextrin 0.2 parts methylbenzotriazole 1 part borate ester 0.1 part phosphate ester 0.2 part deionized water 500 parts

[0049] In the present application, the fuel cell coolant has an electric conductivity of 0 μS / cm to 5 μS / cm, preferably 0.5 μS / cm to 2 μS / cm.

[0050] The present application also provides a preparation method of the fuel cell coolant, characterized by comprising the following steps:

[0051] 1) mixing the N,N,N-trimethylglycine and the deionized water base liquid at 30-40°C to obtain a completely dissolved solution;

[0052] 2) completely dissolving the azole compound in the solution obtained in 1) at 40°C, and then adding a specified amount of one or more non-ionic corrosion inhibitors such as ester compounds and dextrin to obtain a completely dissolved solution;

[0053] 3) removing impurities through an ultra-filtration device, and then passing through a Rohm & Haas AMBERJET UP6040 ion exchange resin until a conductivity of 0-5 μS / cm is obtained to obtain the fuel cell coolant.

[0054] The application also provides a fuel cell coolant or a fuel cell coolant prepared by the preparation method, which is applied to a coolant temperature control system of a hydrogen fuel cell, preferably a temperature control system of a hydrogen fuel cell with a proton exchange membrane, more preferably a temperature control system of a hydrogen fuel cell with a proton exchange membrane containing sulfonic acid groups, and further more preferably a temperature control system of a hydrogen fuel cell with a perfluorosulfonic acid proton exchange membrane.

[0055] The application has the following beneficial effects:

[0056] The fuel cell coolant of the application has low conductivity, metal ion inhibition ability and effective protection against corrosion of metals such as aluminum, copper and steel, and more surprisingly, excellent compatibility with a fuel cell proton exchange membrane, which does not cause poisoning of the proton membrane and permanent damage to the hydrogen fuel cell. DETAILED DESCRIPTION

[0057] The preferred embodiments of the application will be described in detail below with reference to the examples. It should be understood that the following examples are given only for the purpose of illustration and are not intended to limit the scope of the application. Those skilled in the art can make various modifications and replacements to the application without departing from the spirit and principles of the application.

[0058] The experimental methods used in the following examples are conventional methods unless otherwise specified. The materials, reagents, etc. used in the following examples can be obtained from commercial sources unless otherwise specified.

[0059] The ultra-filtration described in the detailed description of the application is performed using a 1 μm ultra-filtration device, the resistivity of the deionized water used is 18 MΩ·cm, and the ion exchange resin used is a Rohm & Haas AMBERJET UP6040 ion exchange resin.

[0060] Example 1

[0061] The present example provides a fuel cell coolant comprising the following components by weight:

[0062] N,N,N-trimethylglycine 100 parts deionized water 900 parts;

[0063] The fuel cell coolant is prepared as follows:

[0064] Add 100 parts of N,N,N-trimethyl glycine to 900 parts of deionized water, heat to 40°C and stir for 50 minutes, then filter out impurities by ultra-filtration, then pass through ion exchange resin from an initial conductivity of 332 μS / cm to a final conductivity of 0.5 μS / cm, and finally obtain a fuel cell coolant with a freezing point of -2.3°C.

[0065] Example 2

[0066] The present example provides a fuel cell coolant comprising the following components by weight:

[0067] N,N,N-trimethylglycine 600 parts deionized water 400 parts;

[0068] The fuel cell coolant is prepared as follows:

[0069] Add 600 parts of N,N,N-trimethyl glycine to 400 parts of deionized water, heat to 30°C and stir for 50 minutes, then filter out impurities by ultra-filtration, then pass through ion exchange resin from an initial conductivity of 512 μS / cm to a final conductivity of 0.5 μS / cm, and finally obtain a fuel cell coolant with a freezing point of -57.8°C.

[0070] Example 3

[0071] The present example provides a fuel cell coolant comprising the following components by weight:

[0072] N,N,N-trimethylglycine 500 parts deionized water 500 parts;

[0073] The fuel cell coolant is prepared as follows:

[0074] Add 500 parts of N,N,N-trimethyl glycine to 500 parts of deionized water, heat to 30°C and stir for 50 minutes, then filter out impurities by ultra-filtration, then pass through ion exchange resin from an initial conductivity of 398 μS / cm to a final conductivity of 0.5 μS / cm, and finally obtain a fuel cell coolant with a freezing point of -35.8°C.

[0075] Example 4

[0076] The present example provides a fuel cell coolant comprising the following components by weight:

[0077] N,N,N-trimethylglycine 100 parts dextrin 0.02 parts methylbenzotriazole 0.1 part borate ester 0.01 part phosphate ester 0.02 part carbonic acid amide 0.001 part deionized water 900 parts;

[0078] The fuel cell coolant is prepared as follows:

[0079] Add 100 parts of N,N,N-trimethyl glycine to 900 parts of deionized water, heat to 35°C and stir for 35 minutes, after dissolution add 0.1 parts of methyl benzotriazole, maintain temperature at 40°C and stir until dissolved, then add 0.02 parts of dextrin, 0.01 parts of borate, 0.02 parts of phosphate, 0.001 parts of carbonic acid amide, dissolve, then filter out impurities by ultra-fine filtration, then pass through ion exchange resin, from an initial conductivity of 356 μS / cm to a final conductivity of 0.5 μS / cm, finally obtain a fuel cell coolant with a freezing point of -2.5°C.

[0080] Example 5

[0081] This example provides a fuel cell coolant comprising the following components by weight:

[0082] N,N,N-trimethylglycine 600 parts dextrin 0.02 parts methylbenzotriazole 0.1 part borate ester 0.01 part phosphate ester 0.02 part carbonic acid amide 0.001 part deionized water 400 parts;

[0083] The fuel cell coolant is prepared as follows:

[0084] Add 600 parts of N,N,N-trimethyl glycine to 400 parts of deionized water, heat to 35°C and stir for 35 minutes, after dissolution add 0.1 parts of methyl benzotriazole, maintain temperature at 40°C and stir until dissolved, then add 0.02 parts of dextrin, 0.01 parts of borate, 0.02 parts of phosphate, 0.001 parts of carbonic acid amide, dissolve, then filter out impurities by ultra-fine filtration, then pass through ion exchange resin, from an initial conductivity of 525 μS / cm to a final conductivity of 4.5 μS / cm, finally obtain a fuel cell coolant with a freezing point of -58.3°C.

[0085] Example 6

[0086] This example provides a fuel cell coolant comprising the following components by weight:

[0087] N,N,N-trimethylglycine 500 parts dextrin 0.02 parts methylbenzotriazole 0.1 part borate ester 0.01 part phosphate ester 0.02 part carbonic acid amide 0.001 part deionized water 500 parts; N,N,N-trimethylglycine 500 parts dextrin 0.2 parts methylbenzotriazole 1 part borate ester 0.1 part phosphate ester 0.2 part carbonic acid amide 0.01 part deionized water 500 parts; N,N,N-trimethylglycine 500 parts methylbenzotriazole 1 part borate ester 0.1 part phosphate ester 0.2 part carbonic acid amide 0.01 part deionized water 500 parts; N,N,N-trimethylglycine 500 parts dextrin 0.2 parts borate ester 0.1 part phosphate ester 0.2 part carbonic acid amide 0.01 part deionized water 500 parts; N,N,N-trimethylglycine 500 parts dextrin 0.2 parts methylbenzotriazole 1 part phosphate ester 0.2 part carbonic acid amide 0.01 part deionized water 500 parts. phosphonate 0.02 parts carbonate amide 0.001 parts deionized water 500 parts;

[0088] The fuel cell coolant is prepared as follows:

[0089] To 500 parts of deionized water, 500 parts of N,N,N-trimethyl glycine was added and heated to 35°C with stirring for 35 min, after dissolution, 0.1 parts of methyl benzotriazole was added while maintaining the temperature at 40°C and stirring until dissolution, then 0.02 parts of dextrin, 0.01 parts of borate, 0.02 parts of phosphate, 0.001 parts of carbonic acid amide were dissolved, then the impurities were removed by ultra-filtration, then passed through ion exchange resin, from the initial conductivity of 465 μS / cm until the final conductivity of 3.4 μS / cm, finally obtained a freezing point of -36.5°C fuel cell coolant.

[0090] Example 7

[0091] This example provides a fuel cell coolant comprising the following components by weight:

[0092] N,N,N-trimethyl glycine 500 parts dextrin 0.2 parts methyl benzotriazole 1 part borate ester 0.1 part phosphonate 0.2 parts carbonate amide 0.01 parts deionized water 500 parts;

[0093] The preparation method of the fuel cell coolant is as follows:

[0094] To 500 parts of deionized water, 500 parts of N,N,N-trimethyl glycine was added and heated to 35°C with stirring for 40 min, after dissolution, 1 parts of methyl benzotriazole was added while maintaining the temperature at 40°C and stirring until dissolution, then 0.2 parts of dextrin, 0.1 parts of borate, 0.2 parts of phosphate, 0.01 parts of carbonic acid amide were dissolved, then the impurities were removed by ultra-filtration, then passed through ion exchange resin, from the initial conductivity of 679 μS / cm until the final conductivity of 1.5 μS / cm, finally obtained a freezing point of -36.5°C fuel cell coolant.

[0095] Example 8

[0096] This example provides a fuel cell coolant comprising the following components by weight:

[0097] N,N,N-trimethyl glycine 500 parts dextrin 2 parts methyl benzotriazole 10 parts borate ester 1 part phosphonate 2 parts carbonate amide 0.1 parts deionized water 500 parts;

[0098] The preparation method of the fuel cell coolant is as follows:

[0099] To 500 parts of deionized water, 500 parts of N,N,N-trimethyl glycine was added and heated to 35°C with stirring for 45 min, after dissolution, 10 parts of methyl benzotriazole was added while maintaining the temperature at 40°C and stirring until dissolution, then 2 parts of dextrin, 1 parts of borate, 2 parts of phosphate, 0.1 parts of carbonic acid amide were dissolved, then the impurities were removed by ultra-filtration, then passed through ion exchange resin, from the initial conductivity of 1200 μS / cm until the final conductivity of 1.5 μS / cm, finally obtained a freezing point of -36.8°C fuel cell coolant.

[0100] Example 9

[0101] The present example provides a fuel cell coolant comprising the following components in parts by weight:

[0102] N,N,N-trimethyl glycine 500 parts methyl benzotriazole 1 part borate ester 0.1 part phosphonate 0.2 parts carbonate amide 0.01 parts deionized water 500 parts;

[0103] The fuel cell coolant is prepared as follows:

[0104] 500 parts of N,N,N-trimethyl glycine is added to 500 parts of deionized water heated to 30°C and stirred for 30 min, after dissolution, 1 part of methyl benzotriazole is added to maintain the temperature at 40°C and stirred until dissolution, then 0.1 part of borate, 0.2 part of phosphate, 0.01 part of carbonic acid amide is dissolved, then ultra-fine filtration is performed to remove impurities, then ion exchange resin is used, from the initial conductivity of 632 μS / cm to the final conductivity of 1.5 μS / cm, finally a fuel cell coolant with a freezing point of -36.8°C is obtained.

[0105] Example 10

[0106] The present example provides a fuel cell coolant comprising the following components in parts by weight:

[0107] N,N,N-trimethyl glycine 500 parts dextrin 0.2 parts borate ester 0.1 part phosphonate 0.2 parts carbonate amide 0.01 parts deionized water 500 parts;

[0108] The fuel cell coolant is prepared as follows:

[0109] 500 parts of N,N,N-trimethyl glycine is added to 500 parts of deionized water heated to 30°C and stirred for 30 min, after dissolution, 0.1 part of borate, 0.2 part of phosphate, 0.01 part of carbonic acid amide is dissolved, then ultra-fine filtration is performed to remove impurities, then ion exchange resin is used, from the initial conductivity of 695 μS / cm to the final conductivity of 1.5 μS / cm, finally a fuel cell coolant with a freezing point of -36.5°C is obtained.

[0110] Example 11

[0111] The present example provides a fuel cell coolant comprising the following components in parts by weight:

[0112] N,N,N-trimethyl glycine 500 parts dextrin 0.2 parts methyl benzotriazole 1 part phosphonate 0.2 parts carbonate amide 0.01 parts deionized water 500 parts

[0113] The fuel cell coolant is prepared as follows:

[0114] Example 1

[0115] Example 2

[0116] The present example provides a fuel cell coolant comprising the following components by weight:

[0117] N,N,N-trimethyl glycine 500 parts dextrin 0.2 parts methyl benzotriazole 1 part borate ester 0.1 part phosphonate 0.2 parts deionized water 500 parts

[0118] The method of preparing the fuel cell coolant is as follows:

[0119] Example 3

[0120] Comparative Example 1

[0121] The present comparative example provides a fuel cell coolant comprising the following components by weight: ethylene glycol 500 parts, deionized water 500 parts, and a conductivity of 0.5 μS / cm after filtration.

[0122] Comparative Example 2

[0123] The present comparative example provides a fuel cell coolant comprising the following components by weight: propylene glycol 500 parts, deionized water 500 parts, and a conductivity of 0.5 μS / cm after filtration.

[0124] Comparative Example 3

[0125] The present comparative example provides a fuel cell coolant comprising the following components by weight: ethanol 500 parts, deionized water 500 parts, and a conductivity of 0.5 μS / cm after filtration.

[0126] Comparative Example 4

[0127] The comparative example provides a fuel cell coolant, the preparation method of which is the same as that of example 7, except that N,N,N-trimethylglycine is replaced by ethylene glycol, and the conductivity of the filtered solution is 1.5 μS / cm.

[0128] Comparative example 5

[0129] The comparative example provides a fuel cell coolant, the preparation method of which is the same as that of example 7, except that N,N,N-trimethylglycine is replaced by propylene glycol, and the conductivity of the filtered solution is 1.5 μS / cm.

[0130] Comparative example 6

[0131] The comparative example provides a fuel cell coolant, the preparation method of which is the same as that of example 7, except that the Rohm & Haas AMBERJET UP6040 ion exchange resin is replaced by the Lewatit deionization resin S930.

[0132] The test examples are directed to the performance testing of the fuel cell coolants prepared in examples 1-12 and the coolants prepared in comparative examples 1-6. The antifreezing performance is tested according to SH / T 0090; the conductivity is tested according to GB 6682 7.2; the ion inhibition performance is tested according to the method for aluminum, steel, brass metal test pieces and metal test piece cleaning method specified in SH / T 0085, the metal test pieces are immersed in the solution without forming a galvanic couple, the test temperature is raised to 150℃, the test period is 168 h, the metal corrosion of the test sample is tested to reflect the metal ion inhibition capacity. The proton membrane compatibility performance is tested according to GB / T 20042.3 proton conductivity, wherein before testing according to the specified method, the proton membrane must be soaked in the coolant at 80℃±2℃ for 1 h, and the proton conductivity is unqualified if it is decreased by more than 5% of the original value, and is qualified if it is decreased by no more than 5% of the original value. The specific test results are shown in Table 1.

[0133] Table 1 Performance test results of the fuel cell coolants of examples 1-12 and comparative examples 1-6

[0134]

[0135] In summary, the fuel cell coolant of the present application has excellent antifreezing performance, proton membrane compatibility performance, low conductivity and metal ion inhibition capacity.

[0136] It should be noted that the foregoing examples have been provided merely for the purposes of illustration and are not intended to limit the application in any way. Descriptions and examples of materials and processes of the application are intended to be illustrative not limiting. Any modifications of the application and other applications of the application will occur to those skilled in the art to which the application pertains and many options for modification of the application will suggest themselves. The application lies in the broadest aspects of the art, and there are many alternatives for the application of the application.

Claims

1. A fuel cell coolant, characterized by, The fuel cell coolant liquid is prepared by the following steps: 1) mixing N,N,N-trimethylglycine and deionized water at 30-40 DEG C to obtain a completely dissolved solution; 2) completely dissolving methylbenzotriazole in the solution obtained in step 1) at 40 DEG C, and then adding specified amounts of dextrin, phosphate ester, borate ester and carbonate amide to obtain a completely dissolved solution; 3) removing impurities from the solution obtained in step 2) by ultrafiltration, and then passing through a Rohm & Haas AMBERJET UP6040 ion exchange resin until the conductivity is 0-5 muS / cm to obtain the fuel cell coolant liquid. The resistivity of the deionized water is not less than 18 M omega cm.

2. The fuel cell coolant according to claim 1, characterized by, The fuel cell coolant liquid comprises the following components by weight:

3. The fuel cell coolant of claim 1, wherein or: ； or: ； or: ； or: ； or: 。

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