Cooling medium and preparation method and application thereof

Abstract

The invention relates to the technical field of cooling media, in particular to a cooling medium and a preparation method and application thereof. The cooling medium comprises the following components in parts by weight: 1-3 parts of a metal corrosion inhibitor and 0.5-2 parts of an organic corrosion inhibitor; the metal corrosion inhibitor is 2, 6-dimethyl quinoline and / or 3, 8-dimethyl quinoline; the organic corrosion inhibitor is glycine Schiff base and / or tyrosine Schiff base. The cooling medium has excellent magnesium alloy material corrosion resistance, has excellent corrosion inhibition performance on other metal materials such as cast aluminum, steel, red copper, brass and various aluminum metals, also has good sediment dispersion performance and hard water resistance, and has good compatibility with various non-metallic materials.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling media, and in particular to a cooling medium and a preparation method and application thereof. Background Art

[0002] With the rapid development of the new energy industry, stimulated by energy security strategies and energy conservation and emission reduction benefits, many countries around the world are currently formulating specific policies to encourage and promote major automobile companies in the world to develop new energy vehicles, strive to reduce automobile energy consumption and emissions to a minimum, and smoothly transition to the post-automobile era powered by new energy.

[0003] The rapid development of the automobile industry driven by multiple policies and interests has also brought about the development and innovation of the entire industrial chain. Its development is also concentrated on the lightweight, integrated, energy-saving and emission-reduction aspects of automobiles. According to literature, for every 100kg reduction in the weight of a car, fuel consumption can be reduced by 5%. Especially in terms of automotive materials, the application of lightweight materials in the automotive industry is increasing. For example, more and more automotive OEMs use magnesium alloys, magnesium-aluminum alloys and polymer materials to replace traditional materials to reduce the weight of cars. Among them, magnesium alloy is a high-performance lightweight structural material with magnesium as raw material. It has a small specific gravity, and its stiffness and strength are similar to those of traditional aluminum metal. It also has strong excellent properties such as strong shock resistance, anti-electromagnetic, thermal conductivity, and electrical conductivity, and can be fully recycled without pollution. In addition, it has good castability and dimensional stability, is easy to process, has a low scrap rate, has a good damping coefficient, and has a vibration reduction greater than that of aluminum alloy and cast iron. It is very suitable for the production of automotive parts. At present, more and more domestic and foreign auto companies are using magnesium alloys in the manufacture of automotive parts.

[0004] The disadvantages of magnesium alloys are that they are easy to burn, have low strength, and are easy to corrode, which has seriously restricted the development of magnesium alloy technology and products in my country. Although more and more companies are using magnesium alloy materials in the three-electric system of new energy vehicles, the material will be in direct contact with the cooling medium, so the corrosion resistance of magnesium alloys has always been a major problem, restricting the development and application of materials in this industry. Summary of the invention

[0005] In order to solve the above technical problems of the present invention, the present invention provides a cooling medium and a preparation method and application thereof. The cooling medium of the present invention is used in the cooling system of magnesium alloy materials to take away the heat of the equipment in time to ensure the normal operation of the equipment. The cooling medium of the present invention has excellent corrosion resistance of magnesium alloy materials, and also has excellent corrosion inhibition performance on other metal materials such as cast aluminum, steel, copper, brass and various aluminum metals, and also has good sediment dispersion performance and hard water resistance, and has good compatibility with various non-metallic materials.

[0006] According to the first aspect of the present invention, the present invention provides a cooling medium comprising the following components in parts by weight: 1 to 3 parts of metal corrosion inhibitor and 0.5 to 2 parts of organic corrosion inhibitor; the parts by weight described in the present invention can be weight units known in the art such as mg, g, kg, etc., or multiples thereof, such as 1 / 10, 1 / 100, 10 times, 100 times, etc.

[0007] The metal corrosion inhibitor is 2,6-dimethylquinoline and / or 3,8-dimethylquinoline;

[0008] The organic corrosion inhibitor is glycine Schiff base and / or tyrosine Schiff base.

[0009] In the above scheme, the cooling medium of the present invention includes a metal corrosion inhibitor and an organic corrosion inhibitor, wherein 2,6-dimethylquinoline and / or 3,8-dimethylquinoline are selected as metal corrosion inhibitors, which have good corrosion inhibition performance for various metals, especially after compounding with organic corrosion inhibitors, it can improve the corrosion resistance of magnesium alloy AZ91D and magnesium AM50, which are currently commonly used lightweight materials in the three-electric system of the new energy industry. The organic corrosion inhibitor uses glycine Schiff base and / or tyrosine Schiff base, which can achieve metal corrosion inhibition for various metals such as copper, aluminum 3003, 4043 and 6063 under alkaline conditions.

[0010] Furthermore, the following components are included in parts by weight: 0.5 to 1.5 parts of a scale inhibitor and dispersant;

[0011] Preferably, the scale inhibitor and dispersant is hydrolyzed polymaleic anhydride; more preferably, the molecular weight of the hydrolyzed polymaleic anhydride is 500-600.

[0012] In the above scheme, the cooling medium of the present invention also includes a scale inhibitor dispersant, which plays a role in dispersing and inhibiting scale. The amount of the scale inhibitor dispersant is further limited, and the scale inhibitor dispersant is limited to a hydrolyzed polymaleic anhydride with a molecular weight of 500-600. It can play a good dispersing role in the ethylene glycol aqueous solution and can play a scale inhibitory role. At the same time, it can combine with calcium and magnesium ions to enhance the ability to resist hard water and prevent the formation of scale-like substances, which will cause the circulation of the heat dissipation system to be blocked.

[0013] Furthermore, the invention also includes the following components in parts by weight: 0.1 to 0.5 parts of a non-metallic material protective agent;

[0014] Preferably, the non-metallic material protective agent is mercaptopropyltrimethoxysilane.

[0015] In the above scheme, the cooling medium of the present invention also includes a non-metallic material protective agent, which further limits the amount and type of the non-metallic material protective agent, and can protect non-metallic materials such as EPDM, silicone rubber, PA12, PA66, PPS and other rubbers and plastics.

[0016] Furthermore, the following components are included in parts by weight: 0.001 to 0.01 parts of antifoaming agent, 0.5 to 2 parts of pH value adjusting agent;

[0017] Preferably, the anti-foaming agent is L61; and the pH adjuster is sodium hydroxide.

[0018] In the above scheme, the cooling medium of the present invention also includes an anti-foaming agent and a pH regulator. The anti-foaming agent can effectively inhibit the formation of foam in the cooling medium, and the pH regulator can effectively adjust the acidity and alkalinity of the solvent to ensure the stability of the cooling medium product and excellent metal corrosion inhibition performance.

[0019] Furthermore, it also includes a freezing point depressant and deionized water; preferably, the freezing point depressant is ethylene glycol.

[0020] Further, the following components are included in parts by weight:

[0021]

[0022]

[0023] In the above scheme, the cooling medium of the present invention limits the dosage of metal corrosion inhibitors, organic corrosion inhibitors, scale inhibitors and dispersants, non-metallic material protective agents, anti-foaming agents, pH regulators, freezing point depressants and water within a reasonable range, so that the components can achieve better synergistic effects, so that the obtained cooling medium has better corrosion resistance, sediment dispersion performance and hard water resistance, and can be better compatible with a variety of non-metallic materials.

[0024] According to a second aspect of the present invention, the present invention also provides a method for preparing the above-mentioned cooling medium, comprising the following steps:

[0025] Dissolve metal corrosion inhibitor, organic corrosion inhibitor, scale inhibitor, non-metallic material protective agent, pH adjuster and freezing point depressant in water, stir at room temperature, then add anti-foaming agent and continue stirring.

[0026] In the above scheme, the cooling medium preparation method of the present invention is simple and easy to implement.

[0027] Furthermore, the stirring time at room temperature is 30-60 minutes; and the stirring time is continued for 15-20 minutes.

[0028] In the above scheme, by limiting the stirring time in the cooling medium preparation process to a reasonable range, the components can be fully mixed to form a cooling medium with stable performance.

[0029] According to a third aspect of the present invention, the present invention also provides application of the above-mentioned cooling medium in a magnesium alloy three-electric system.

[0030] The technical solution provided by the present invention has the following beneficial effects:

[0031] The cooling medium of the present invention has good corrosion inhibition and can provide anti-corrosion protection for various metal materials used in new energy vehicles, especially for magnesium alloy materials. It also has excellent corrosion inhibition performance for other metal materials such as cast aluminum, steel, copper, brass and various aluminum metals.

[0032] The cooling medium of the invention has good sediment dispersion performance and hard water resistance performance, and can ensure the stability of the product.

[0033] The cooling medium of the present invention has good material compatibility with non-metallic materials such as EPDM, silicone rubber, PA12, PA66 and PPS, and can extend the service life of parts. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1

[0036] This embodiment provides a cooling medium for a magnesium alloy three-electric system, which is composed of:

[0037]

[0038] The preparation method of the cooling medium is as follows: dissolve metal corrosion inhibitors, organic corrosion inhibitors, scale inhibitors and dispersants, non-metallic material protective agents, pH regulators and freezing point depressants in water, stir at room temperature for 30-60 minutes, then add anti-foaming agents and continue stirring for 15-20 minutes.

[0039] Example 2

[0040] This embodiment provides a cooling medium for a magnesium alloy three-electric system, which is composed of:

[0041]

[0042]

[0043] The preparation method of the cooling medium is as follows: dissolve metal corrosion inhibitors, organic corrosion inhibitors, scale inhibitors and dispersants, non-metallic material protective agents, pH regulators and freezing point depressants in water, stir at room temperature for 30-60 minutes, then add anti-foaming agents and continue stirring for 15-20 minutes.

[0044] Example 3

[0045] This embodiment provides a cooling medium for a magnesium alloy three-electric system, which is composed of:

[0046]

[0047] The preparation method of the cooling medium is as follows: dissolve metal corrosion inhibitors, organic corrosion inhibitors, scale inhibitors and dispersants, non-metallic material protective agents, pH regulators and freezing point depressants in water, stir at room temperature for 30-60 minutes, then add anti-foaming agents and continue stirring for 15-20 minutes.

[0048] Example 4

[0049] This embodiment provides a cooling medium for a magnesium alloy three-electric system, which is composed of:

[0050]

[0051]

[0052] The preparation method of the cooling medium is as follows: dissolve metal corrosion inhibitors, organic corrosion inhibitors, scale inhibitors and dispersants, non-metallic material protective agents, pH regulators and freezing point depressants in water, stir at room temperature for 30-60 minutes, then add anti-foaming agents and continue stirring for 15-20 minutes.

[0053] Example 5

[0054] This embodiment provides a cooling medium for a magnesium alloy three-electric system, which is composed of:

[0055]

[0056] The preparation method of the cooling medium is as follows: dissolve metal corrosion inhibitors, organic corrosion inhibitors, scale inhibitors and dispersants, non-metallic material protective agents, pH regulators and freezing point depressants in water, stir at room temperature for 30-60 minutes, then add anti-foaming agents and continue stirring for 15-20 minutes.

[0057] Example 6

[0058] This embodiment provides a cooling medium for a magnesium alloy three-electric system, which is composed of:

[0059]

[0060]

[0061] The preparation method of the cooling medium is as follows: dissolve metal corrosion inhibitors, organic corrosion inhibitors, scale inhibitors and dispersants, non-metallic material protective agents, pH regulators and freezing point depressants in water, stir at room temperature for 30-60 minutes, then add anti-foaming agents and continue stirring for 15-20 minutes.

[0062] Example 7

[0063] This embodiment provides a cooling medium for a magnesium alloy three-electric system, which is composed of:

[0064]

[0065] The preparation method of the cooling medium is as follows: dissolve metal corrosion inhibitors, organic corrosion inhibitors, scale inhibitors and dispersants, non-metallic material protective agents, pH regulators and freezing point depressants in water, stir at room temperature for 30-60 minutes, then add anti-foaming agents and continue stirring for 15-20 minutes.

[0066] Example 8

[0067] This embodiment provides a cooling medium for a magnesium alloy three-electric system, which is composed of:

[0068]

[0069]

[0070] Comparative Example 1

[0071] This comparative example provides a cooling medium for a magnesium alloy three-electric system. Compared with Example 4, it does not contain a glycine Schiff base, and its specific composition is:

[0072]

[0073] The preparation method of the cooling medium is as follows: dissolve the metal corrosion inhibitor, scale inhibitor, non-metallic material protective agent, pH value adjuster and freezing point depressant in water, stir at room temperature for 30-60 minutes, then add the anti-foaming agent and continue stirring for 15-20 minutes.

[0074] Comparative Example 2

[0075] This comparative example provides a cooling medium for a magnesium alloy three-electric system, which is composed of:

[0076]

[0077] Comparative Example 3

[0078] This comparative example provides a cooling medium for a magnesium alloy three-electric system. Compared with Example 4, it does not contain 3,8-dimethylquinoline, and its specific composition is:

[0079]

[0080]

[0081] Comparative Example 4

[0082] This comparative example provides a cooling medium for a magnesium alloy three-electric system. Compared with Example 4, sebacic acid is used to replace 3,8-dimethylquinoline, and its specific composition is:

[0083]

[0084] Comparative Example 5

[0085] This comparative example provides a cooling medium for a magnesium alloy three-electric system. Compared with Example 4, methyl phenyltriazole is used to replace glycine Schiff base, and its specific composition is:

[0086]

[0087]

[0088] Comparative Example 6

[0089] This comparative example provides a cooling medium for a magnesium alloy three-electric system, which is composed of:

[0090]

[0091] Comparative Example 7

[0092] This comparative example provides a cooling medium for a magnesium alloy three-electric system, which is composed of:

[0093]

[0094] Experimental example

[0095] The cooling medium for the magnesium alloy three-electric system of the above embodiments and comparative examples was tested for glassware corrosion test, aluminum deposition test, hard water compatibility, high and low temperature stability test and non-metallic material compatibility. The test methods and standards are shown in Table 1.

[0096] Table 1 Test methods and standards

[0097]

[0098]

[0099] The cooling medium for the magnesium alloy three-electric system provided by Examples 1 to 8 and Comparative Examples 1-7 was evaluated according to the performance index method in Table 1. The test results are shown in Tables 2 and 3.

[0100] Table 2 Example test results

[0101]

[0102]

[0103] Table 3 Comparative Example Test Results

[0104]

[0105]

[0106] The results in Table 2 show that the cooling medium of the magnesium alloy three-electric system provided by the present invention has excellent anti-corrosion performance of magnesium alloy materials, and also has excellent corrosion inhibition performance on other metal materials such as cast aluminum, steel, copper, brass and various aluminum metals, and has good sediment dispersion performance and hard water resistance and compatibility with various non-metallic materials.

[0107] Comparison of the results in Table 2 and Table 3 shows that the cooling medium of the present invention limits the dosage of metal corrosion inhibitors, organic corrosion inhibitors, scale inhibitors and dispersants, non-metallic material protective agents, anti-foaming agents, pH regulators, freezing point depressants and water within a reasonable range, and strictly limits the types of each raw material, so that the components can achieve better synergistic effects, so that the obtained cooling medium has more excellent anti-corrosion performance, sediment dispersibility and hard water resistance, and can be better compatible with a variety of non-metallic materials.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cooling medium, characterized in that: The invention comprises the following components in parts by weight: 1 to 3 parts of metal corrosion inhibitor and 0.5 to 2 parts of organic corrosion inhibitor; The metal corrosion inhibitor is 2,6-dimethylquinoline and / or 3,8-dimethylquinoline; The organic corrosion inhibitor is glycine Schiff base and / or tyrosine Schiff base.

2. The cooling medium according to claim 1, characterized in that It also includes the following ingredients in parts by weight: 0.5 to 1.5 parts of scale inhibitor and dispersant; Preferably, the scale inhibitor and dispersant is hydrolyzed polymaleic anhydride; more preferably, the molecular weight of the hydrolyzed polymaleic anhydride is 500-600.

3. The cooling medium according to claim 1, characterized in that It also includes the following ingredients in parts by weight: 0.1 to 0.5 parts of non-metallic material protective agent; Preferably, the non-metallic material protective agent is mercaptopropyltrimethoxysilane.

4. The cooling medium according to claim 1, characterized in that It also includes the following ingredients in parts by weight: 0.001 to 0.01 parts of antifoaming agent, 0.5 to 2 parts of pH regulator; Preferably, the anti-foaming agent is L61; and the pH adjuster is sodium hydroxide.

5. The cooling medium according to claim 1, characterized in that It also includes a freezing point depressant and deionized water; preferably, the freezing point depressant is ethylene glycol.

6. The cooling medium according to claim 1, characterized in that The composition comprises the following components in parts by weight:

7. The method for preparing a cooling medium according to any one of claims 1 to 6, characterized in that: The steps include: Dissolve metal corrosion inhibitor, organic corrosion inhibitor, scale inhibitor, non-metallic material protective agent, pH adjuster and freezing point depressant in water, stir at room temperature, then add anti-foaming agent and continue stirring.

8. The preparation method according to claim 7, characterized in that: The stirring time at room temperature is 30-60 minutes; the stirring time is continued for 15-20 minutes.

9. Application of the cooling medium according to any one of claims 1 to 6 in a magnesium alloy three-electric system.

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