Cooling medium, method for its production and use

Abstract

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

Description

Technical Field

[0001] This invention relates to the field of cooling medium technology, and in particular to a cooling medium, its preparation method, and its application. Background Technology

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

[0003] Driven by various policies and interests, the automotive industry has developed rapidly, bringing about the development and innovation of the entire industrial chain. Its development is concentrated on lightweighting, integration, and energy conservation and emission reduction in automobiles. According to literature, for every 100kg reduction in the weight of a car, fuel consumption can be reduced by 5%. In particular, in terms of automotive materials, the application of lightweight materials in the automotive industry is increasing. For example, more and more car OEMs are using magnesium alloys, magnesium-aluminum alloys, and polymer materials to replace traditional materials to reduce the weight of cars. Among them, magnesium alloys are high-performance lightweight structural materials made from magnesium. They have low specific gravity, stiffness and strength similar to traditional aluminum metal, and also have excellent properties such as strong shock resistance, electromagnetic insulation, thermal conductivity, and electrical conductivity. They can be fully recycled without pollution. In addition, they have good castability and dimensional stability, are easy to process, have a low scrap rate, and have a good damping coefficient. Their vibration reduction is greater than that of aluminum alloys and cast iron, making them very suitable for the production of automotive parts. Currently, more and more domestic and foreign car companies are using magnesium alloys in the manufacturing of automotive parts.

[0004] Magnesium alloys suffer from drawbacks such as flammability, low strength, and susceptibility to corrosion, which severely restricts the development of magnesium alloy technology and products in my country. Although an increasing number of companies are using magnesium alloys in the three-electric systems of new energy vehicles, these materials come into direct contact with the cooling medium, making corrosion prevention a significant challenge and hindering their development and application in this industry. Summary of the Invention

[0005] To address the aforementioned technical problems of this invention, the present invention provides a cooling medium, its preparation method, and its application. Using the cooling medium of this invention in a cooling system for magnesium alloy materials can effectively remove heat from the equipment, ensuring its normal operation. The cooling medium of this invention exhibits excellent corrosion resistance to magnesium alloy materials, as well as excellent corrosion inhibition properties against other metallic materials such as cast aluminum, steel, copper, brass, and various aluminum metals. It also possesses good sediment dispersion and hard water resistance, and good compatibility with various non-metallic materials.

[0006] According to a 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 a metal corrosion inhibitor and 0.5 to 2 parts of an organic corrosion inhibitor; the parts by weight mentioned in the present invention may be weight units known in the art such as mg, g, kg, 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 a glycine Schiff base and / or a tyrosine Schiff base.

[0009] In the above-described scheme, the cooling medium of the present invention includes a metal corrosion inhibitor and an organic corrosion inhibitor. 2,6-Dimethylquinoline and / or 3,8-Dimethylquinoline are selected as the metal corrosion inhibitors, exhibiting good corrosion inhibition performance against various metals. Especially when combined with the organic corrosion inhibitor, it can improve the corrosion resistance of magnesium alloys AZ91D and AM50, which are commonly used lightweight materials in the three-electric systems of the new energy industry. The organic corrosion inhibitor uses glycine Schiff base and / or tyrosine Schiff base, which can inhibit metal corrosion of various metals such as copper, aluminum 3003, 4043, and 6063 under alkaline conditions.

[0010] Furthermore, it also includes the following components in parts by weight: 0.5 to 1.5 parts of scale inhibitor and dispersant;

[0011] Preferably, the scale inhibitor / dispersant is hydrolyzed polymaleic anhydride; more preferably, the hydrolyzed polymaleic anhydride has a molecular weight of 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 scale inhibitor / dispersant is further limited. The scale inhibitor / dispersant is limited to hydrolyzed polymaleic anhydride with a molecular weight of 500-600. It can play a good dispersing role in ethylene glycol aqueous solution, can play a scale inhibition role, and can combine with calcium and magnesium ions to improve the resistance to hard water and prevent the formation of scale-like substances, which would lead to poor circulation in the heat dissipation system.

[0013] Furthermore, it also includes the following components in parts by weight: 0.1 to 0.5 parts of 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 protectant, further limiting the amount and type of the non-metallic material protectant, which can protect various non-metallic materials such as EPDM, silicone rubber, PA12, PA66 and PPS rubber and plastics.

[0016] Furthermore, it also includes the following components in parts by weight: 0.001 to 0.01 parts of antifoaming agent and 0.5 to 2 parts of pH adjuster;

[0017] Preferably, the antifoaming agent is L61; the pH adjuster is sodium hydroxide.

[0018] In the above-described scheme, the cooling medium of the present invention also includes an antifoaming agent and a pH adjuster. The antifoaming agent can effectively inhibit the formation of foam in the cooling medium, and the pH adjuster can effectively adjust the acidity or alkalinity of the solvent, ensuring the stability of the cooling medium product and its excellent metal corrosion inhibition performance.

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

[0020] Furthermore, it includes the following components in parts by weight:

[0021]

[0022]

[0023] In the above-mentioned solution, the cooling medium of the present invention limits the dosage of metal corrosion inhibitor, organic corrosion inhibitor, scale dispersant, non-metallic material protectant, antifoaming agent, pH adjuster, freezing point lowering agent and water within a reasonable range, so that the components achieve better synergistic effect, and the resulting cooling medium has better anti-corrosion performance, deposit 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-described cooling medium, comprising the following steps:

[0025] Dissolve the metal corrosion inhibitor, organic corrosion inhibitor, scale inhibitor, non-metallic material protectant, pH adjuster, and freezing point lowering agent in water, stir at room temperature, then add the antifoaming agent and continue stirring.

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

[0027] Furthermore, stir at room temperature for 30-60 minutes; continue stirring for 15-20 minutes.

[0028] In the above scheme, by limiting the stirring time during the preparation of the cooling medium 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 invention, the invention also provides the application of the above-described cooling medium in a magnesium alloy three-electric system.

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

[0031] The present invention discloses a cooling medium with good corrosion inhibition properties, which can play a role in preventing corrosion and protecting various metal materials used in new energy vehicles, especially magnesium alloy materials. It also has excellent corrosion inhibition performance on other metal materials such as cast aluminum, steel, copper, brass and various aluminum metals.

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

[0033] The cooling medium of this invention has good material compatibility with non-metallic materials such as EPDM, silicone rubber, PA12, PA66 and PPS, which can extend the service life of components. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0035] Example 1

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

[0037]

[0038] The preparation method of the cooling medium is as follows: Dissolve the metal corrosion inhibitor, organic corrosion inhibitor, scale dispersant, non-metallic material protectant, pH adjuster and freezing point lowering agent in water, stir at room temperature for 30-60 minutes, then add the antifoaming agent and continue stirring for 15-20 minutes.

[0039] Example 2

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

[0041]

[0042]

[0043] The preparation method of the cooling medium is as follows: Dissolve the metal corrosion inhibitor, organic corrosion inhibitor, scale dispersant, non-metallic material protectant, pH adjuster and freezing point lowering agent in water, stir at room temperature for 30-60 minutes, then add the antifoaming agent and continue stirring for 15-20 minutes.

[0044] Example 3

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

[0046]

[0047] The preparation method of the cooling medium is as follows: Dissolve the metal corrosion inhibitor, organic corrosion inhibitor, scale dispersant, non-metallic material protectant, pH adjuster and freezing point lowering agent in water, stir at room temperature for 30-60 minutes, then add the antifoaming agent and continue stirring for 15-20 minutes.

[0048] Example 4

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

[0050]

[0051]

[0052] The preparation method of the cooling medium is as follows: Dissolve the metal corrosion inhibitor, organic corrosion inhibitor, scale dispersant, non-metallic material protectant, pH adjuster and freezing point lowering agent in water, stir at room temperature for 30-60 minutes, then add the antifoaming agent and continue stirring for 15-20 minutes.

[0053] Example 5

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

[0055]

[0056] The preparation method of the cooling medium is as follows: Dissolve the metal corrosion inhibitor, organic corrosion inhibitor, scale dispersant, non-metallic material protectant, pH adjuster and freezing point lowering agent in water, stir at room temperature for 30-60 minutes, then add the antifoaming agent and continue stirring for 15-20 minutes.

[0057] Example 6

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

[0059]

[0060]

[0061] The preparation method of the cooling medium is as follows: Dissolve the metal corrosion inhibitor, organic corrosion inhibitor, scale dispersant, non-metallic material protectant, pH adjuster and freezing point lowering agent in water, stir at room temperature for 30-60 minutes, then add the antifoaming agent and continue stirring for 15-20 minutes.

[0062] Example 7

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

[0064]

[0065] The preparation method of the cooling medium is as follows: Dissolve the metal corrosion inhibitor, organic corrosion inhibitor, scale dispersant, non-metallic material protectant, pH adjuster and freezing point lowering agent in water, stir at room temperature for 30-60 minutes, then add the antifoaming agent and continue stirring for 15-20 minutes.

[0066] Example 8

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

[0068]

[0069]

[0070] Comparative Example 1

[0071] This comparative example provides a cooling medium for a magnesium alloy three-electric system, which, compared to Example 4, does not contain glycine Schiff base, and its specific composition is as follows:

[0072]

[0073] The preparation method of the cooling medium is as follows: dissolve the metal corrosion inhibitor, scale inhibitor, non-metallic material protectant, pH adjuster and freezing point lowering agent in water, stir at room temperature for 30-60 minutes, then add the antifoaming 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, the composition of which is as follows:

[0076]

[0077] Comparative Example 3

[0078] This comparative example provides a cooling medium for a magnesium alloy three-electric system, which, compared to Example 4, does not contain 3,8-dimethylquinoline, and its specific composition is as follows:

[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 instead of 3,8-dimethylquinoline, and its specific composition is as follows:

[0083]

[0084] Comparative Example 5

[0085] This comparative example provides a cooling medium for a magnesium alloy three-electric system. Compared with Example 4, it uses methylphenyltriazole instead of glycine Schiff base, and its specific composition is as follows:

[0086]

[0087]

[0088] Comparative Example 6

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

[0090]

[0091] Comparative Example 7

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

[0093]

[0094] Experimental Example

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

[0096] Table 1 Test methods and standards

[0097]

[0098]

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

[0100] Table 2. Test Results of Examples

[0101]

[0102]

[0103] Table 3 Comparative 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 of other metal materials such as cast aluminum, steel, copper, brass and various aluminum metals. It also has good sediment dispersion performance, hard water resistance and compatibility with various non-metallic materials.

[0107] The comparison of the results in Tables 2 and 3 shows that the cooling medium of the present invention, by limiting the dosage of metal corrosion inhibitors, organic corrosion inhibitors, scale inhibitors and dispersants, non-metallic material protectants, antifoaming agents, pH adjusters, freezing point lowering agents and water within a reasonable range, and by strictly limiting the types of each raw material, achieves better synergistic effects among the components, resulting in a cooling medium with superior anti-corrosion performance, sediment dispersion performance and hard water resistance, and is more 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, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cooling medium, characterized in that, It includes the following components in parts by weight: 1-3 parts metal corrosion inhibitor, 0.5-2 parts organic corrosion inhibitor, 0.5-1.5 parts scale inhibitor and dispersant, 0.001-0.01 parts antifoaming agent, and 0.5-2 parts pH adjuster; The scale inhibitor and dispersant is hydrolyzed polymaleic anhydride; the molecular weight of the hydrolyzed polymaleic anhydride is 500-600; the pH adjuster is sodium hydroxide. The metal corrosion inhibitor is 2,6-dimethylquinoline and / or 3,8-dimethylquinoline; The organic corrosion inhibitor is a glycine Schiff base and / or a tyrosine Schiff base.

2. The cooling medium according to claim 1, characterized in that, It also includes the following components by weight: 0.1 to 0.5 parts of non-metallic material protective agent.

3. The cooling medium according to claim 2, characterized in that, The non-metallic material protective agent is mercaptopropyltrimethoxysilane.

4. The cooling medium according to claim 1, characterized in that, The antifoaming agent is L61.

5. The cooling medium according to claim 1, characterized in that, It also includes freezing point lowering agents and deionized water.

6. The cooling medium according to claim 5, characterized in that, The freezing point lowering agent is ethylene glycol.

7. The cooling medium according to claim 1, characterized in that, Includes the following ingredients by weight: 1-3 parts of metal corrosion inhibitor; 0.5-2 parts of organic corrosion inhibitor; 0.5-1.5 parts of scale inhibitor / dispersant; 0.1 to 0.5 parts of non-metallic material protective agent; Antifoaming agent 0.001-0.01 parts; pH adjuster 0.5-2 parts; 40-60 parts of freezing point lowering agent; 50-60 parts water.

8. The method for preparing the cooling medium according to any one of claims 1-7, characterized in that, Includes the following steps: Dissolve the metal corrosion inhibitor, organic corrosion inhibitor, scale inhibitor, non-metallic material protectant, pH adjuster, and freezing point lowering agent in water, stir at room temperature, then add the antifoaming agent and continue stirring.

9. The preparation method according to claim 8, characterized in that, Stir at room temperature for 30-60 minutes; continue stirring for 15-20 minutes.

10. The application of the cooling medium according to any one of claims 1-7 in a magnesium alloy three-electric system.

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