1. A coolant composition comprising ethylene glycol, water, and a corrosion inhibitor comprising a molybdate salt, a nitrate salt, and a phosphate salt;

based on the total weight of the coolant composition:

the content of the ethylene glycol is 20-70 wt%; the water content is 28-79.78 wt%; the content of the corrosion inhibitor is 0.24-2 wt%;

the ratio of the nitrate to the combined weight of the molybdate and phosphate is 1: (3-15).

2. The coolant composition of claim 1, wherein the molybdate is present in an amount of 0.02 to 0.5 percent by weight, based on the total weight of the coolant composition; the content of the nitrate is 0.02-0.5 wt%; the content of the phosphate is 0.2-1 wt%.

3. The coolant composition of claim 1 wherein the weight ratio of said nitrate, said molybdate and said phosphate is from 1: (1-3): (1.5 to 14).

4. The coolant composition of claim 1, wherein the molybdate is one or more selected from sodium molybdate, potassium molybdate, ammonium molybdate and lithium molybdate, preferably sodium molybdate;

the nitrate is selected from one or more of sodium nitrate, potassium nitrate and ammonium nitrate;

the phosphate is one or more selected from trisodium phosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate, sodium tripolyphosphate, sodium phosphate, potassium dihydrogen phosphate and ammonium dihydrogen phosphate, and preferably is disodium hydrogen phosphate.

5. The coolant composition of claim 1 or 4 wherein said glycol, phosphate, molybdate and nitrate are each more than 99.0% pure by weight and said water is deionized water.

6. A method of preparing a coolant using the coolant composition of any one of claims 1 to 5, the method comprising: mixing ethylene glycol, water and the corrosion inhibitor to obtain cooling liquid;

optionally, mixing ethylene glycol and water, then dissolving phosphate, molybdate and nitrate in the obtained mixed solution, optionally standing and filtering to obtain the cooling liquid.

7. A cooling fluid prepared by the method of claim 6.

8. The cooling fluid of claim 7, wherein the freezing point of the cooling fluid is below 0 ℃, preferably-60 to-35 ℃.

9. The coolant according to claim 7 or 8, wherein the coolant has a pH value of 7.5 to 11.0, preferably 8.0 to 9.0.

10. Use of the coolant composition according to any one of claims 1 to 5 or the coolant according to any one of claims 7 to 9 in an electronic device.

Background

Since the advent of transistors, with the rapid development and application of electronic technology, electronic devices have developed a trend toward high power, small volume, and high integration, and a large number of electronic devices with high heat flux density have been formed. Related research shows that the reliability of the electronic components is reduced by 50% every 10 ℃ of the temperature of the electronic components, so that effective cooling technology must be adopted to control the operating temperature of the electronic equipment. The water-cooling heat dissipation device generally comprises a heat radiator, a water pipe and a water pump, wherein the electronic equipment cooling liquid is used as a heat transfer medium to absorb heat at a heat source end through convection heat transfer, and the heat is transferred to cold sources such as air and the like under the driving of the water pump. The pure water used as the cooling liquid of the electronic equipment has the advantages of high heat transfer efficiency and low cost, but the normal pressure freezing point of the pure water is 0 ℃, the pure water is easy to freeze to cause the breakage of a water cooling pipeline and a radiator when used in a low-temperature environment, and the glycol with different proportions is usually added as the antifreeze to obtain the cooling liquid with different freezing points so as to meet the use requirements of different low-temperature environment temperatures

At present, domestic electronic equipment uses a large amount of vehicle cooling liquid or adopts special cooling liquid products of a vehicle cooling liquid technology, a large amount of inorganic and organic corrosion inhibitors are added into most of the products, and the addition amount is generally more than 3 percent so as to protect cast iron and high lead soldering tin metal in an automobile water cooling system. The addition of a large amount of corrosion inhibitor improves the surface activity of the cooling liquid system, enhances the foaming performance of the cooling liquid and shortens the service life. There is a need in the market for a long lasting low foam electronic device coolant.

Disclosure of Invention

The invention aims to provide a low-foam electronic equipment cooling liquid which is low in surface activity and low in foaming after long-term use, can protect various metal materials in a liquid cooling system of electronic equipment, and can be widely applied to a water cooling system of the electronic equipment in the industries of wind power, high-speed rails, new energy automobiles, computers and the like.

To achieve the object of the present invention, the first aspect of the present disclosure provides a coolant composition comprising ethylene glycol, water, and a corrosion inhibitor comprising molybdate, nitrate, and phosphate; based on the total weight of the coolant composition: the content of the ethylene glycol is 20-70 wt%; the water content is 28-79.78 wt%; the content of the corrosion inhibitor is 0.24-2 wt%; the ratio of the nitrate to the combined weight of the molybdate and phosphate is 1: (3-15).

Optionally, the molybdate is contained in an amount of 0.02 to 0.5 wt% based on the total weight of the coolant composition; the content of the nitrate is 0.02-0.5 wt%; the content of the phosphate is 0.2-1 wt%.

Optionally, the weight ratio of the nitrate, the molybdate and the phosphate is 1: (1-3): (1.5 to 14).

Optionally, the molybdate is selected from one or more of sodium molybdate, potassium molybdate, ammonium molybdate and lithium molybdate, and is preferably sodium molybdate; the nitrate is selected from one or more of sodium nitrate, potassium nitrate and ammonium nitrate; the phosphate is one or more selected from trisodium phosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate, sodium tripolyphosphate, sodium phosphate, potassium dihydrogen phosphate and ammonium dihydrogen phosphate, and preferably is disodium hydrogen phosphate.

Optionally, the ethylene glycol, phosphate, molybdate and nitrate each have a purity of 99.0 wt.% or greater, and the water is deionized water.

A second aspect of the present disclosure provides a method of preparing a cooling fluid, the method comprising: mixing ethylene glycol, water and the corrosion inhibitor to obtain cooling liquid; optionally, mixing ethylene glycol and water, then dissolving phosphate, molybdate and nitrate in the obtained mixed solution, optionally standing and filtering to obtain the cooling liquid.

A cooling fluid made by the method of the second aspect of the invention.

Alternatively, the freezing point of the cooling liquid is below 0 ℃, preferably-60 to-35 ℃.

Optionally, the pH value of the cooling liquid is 7.5-11.0, preferably 8.0-9.0.

Use of the cooling liquid according to the first aspect of the present invention and the second aspect of the present invention in an electronic device.

Through the technical scheme, the cooling liquid composition disclosed by the invention comprises molybdate, nitrate and phosphate which are used as corrosion inhibitors in a specific ratio, has an excellent synergistic effect, and the cooling liquid for electronic equipment prepared by adopting the composition can effectively reduce metal corrosion and shows excellent low-foaming performance and anti-foaming durability.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows. Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Detailed Description

The following describes in detail specific embodiments of the present disclosure. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

A first aspect of the present disclosure provides a coolant composition comprising ethylene glycol, water, and a corrosion inhibitor comprising a molybdate salt, a nitrate salt, and a phosphate salt; based on the total weight of the coolant composition: the content of the ethylene glycol is 20-70 wt%; the water content is 28-79.78 wt%; the content of the corrosion inhibitor is 0.24-2 wt%; the ratio of the nitrate to the combined weight of the molybdate and phosphate is 1: (3-15), preferably 1: (3.1 to 13), more preferably 1: (3.2-7).

Through the technical scheme, the cooling liquid composition disclosed by the invention comprises molybdate, nitrate and phosphate which are used as corrosion inhibitors in a specific ratio, so that an excellent synergistic effect is achieved, and the cooling liquid prepared by adopting the composition can effectively reduce metal corrosion; meanwhile, the content of the compound corrosion inhibitor is low, and excellent low-foaming performance and anti-foaming durability can be shown.

According to the present disclosure, as a preferred embodiment, the molybdate is present in an amount of 0.02 to 0.5 wt%, based on the total weight of the coolant composition; the content of the nitrate is 0.02-0.5 wt%; the content of the phosphate is 0.2-1 wt%. In the preferred embodiment, the compound corrosion inhibitor of the cooling liquid composition has low content of each component, can meet the corrosion prevention requirement of the cooling liquid, and can further enhance the low-foaming performance.

According to the present disclosure, as a preferred embodiment, the weight ratio of the nitrate, the molybdate and the phosphate is 1: (1-3): (1.5 to 14), preferably 1: (1.1-3): (1.7-11), more preferably 1: (1.2-3): (2-7); the latter ratio is preferred for better performance of the cooling fluid.

In the preferred embodiment, the weight ratio of the nitrate, the molybdate and the phosphate satisfies a certain ratio, which can further exert the synergistic effect of the compound corrosion inhibitor, so that the corrosion resistance, the low-foaming performance and the anti-foaming durability of the cooling liquid composition are further enhanced; the ratio of the three salts is preferably 1: (1.1-3): (1.7-11), the synergistic effect of the compound corrosion inhibitor can be further enhanced; the ratio of the three salts is preferably 1: (1.2-3): (2-7), the coolant can exhibit more excellent corrosion resistance, low foaming properties, and anti-foaming durability.

According to the present disclosure, as a preferred embodiment, the molybdate is selected from one or more of sodium molybdate, potassium molybdate, ammonium molybdate and lithium molybdate, preferably sodium molybdate; the nitrate is selected from one or more of sodium nitrate, potassium nitrate and ammonium nitrate; the phosphate is one or more selected from trisodium phosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate, sodium tripolyphosphate, sodium phosphate, potassium dihydrogen phosphate and ammonium dihydrogen phosphate, and preferably is disodium hydrogen phosphate.

In the preferred embodiment, phosphate is used as a pH buffering agent, the pH value of the cooling liquid system is controlled, organic acid generated in the use process of the cooling liquid is effectively neutralized, the service life of the cooling liquid is prolonged, and the generated organic acid is prevented from corroding equipment. The molybdate is adopted to reduce the corrosion of the ethylene glycol group to the cast aluminum alloy radiator and the pipeline and prevent the cavitation corrosion of the aluminum pump. The molybdate, nitrate and phosphate compound corrosion inhibitor system has excellent synergistic effect, particularly enhances the protection effect on various aluminum alloys, and enables the formula of the electronic equipment cooling liquid to use a small amount of corrosion inhibitor to effectively reduce metal corrosion.

In accordance with the present disclosure, as a preferred embodiment, the purity of the ethylene glycol, phosphate, molybdate and nitrate is 99.0 wt% or more, respectively, and the water is deionized water. In the preferred embodiment, the cooling liquid has high purity of each component and low impurity content, and the low foaming performance of the cooling liquid can be further enhanced.

A second aspect of the present disclosure provides a method for preparing a cooling liquid for electronic equipment, including: the method comprises the following steps: mixing ethylene glycol, water and the corrosion inhibitor to obtain cooling liquid; optionally, mixing ethylene glycol and water, then dissolving phosphate, molybdate and nitrate in the obtained mixed solution, optionally standing and filtering to obtain the cooling liquid.

A cooling fluid prepared by the method of the second aspect of the invention.

According to the present disclosure, as a preferred embodiment, the freezing point of the cooling liquid is 0 ℃ or less, preferably-60 to-35 ℃.

In the preferred embodiment, glycol and water are used as base liquids, and cooling liquids with different freezing points can be obtained by adjusting the proportion of the glycol and the water, so that the anti-freezing requirement of the electronic equipment in different environments can be met.

According to the present disclosure, as a preferred embodiment, the pH of the cooling liquid is 7.5 to 11.0, preferably 8.0 to 9.0. In the preferred embodiment, the organic acid generated in the use process of the cooling liquid is effectively neutralized under the buffer condition, so that the service life of the cooling liquid is prolonged.

The cooling liquid adopting the first aspect and the second aspect of the invention is used in electronic equipment, such as a water cooling system of electronic equipment in the industries of wind power, high-speed rail, new energy automobiles, computers and the like.

The present disclosure is further illustrated by the following examples, but is not to be construed as being limited thereby.

The materials, reagents, instruments and equipment used in the examples of the present disclosure are commercially available, unless otherwise specified.

Example 1

The formula of the cooling liquid is as follows: 7000g of ethylene glycol, 50g of disodium hydrogen phosphate, 20g of sodium molybdate, 10g of sodium nitrate and 2920g of deionized water.

The preparation method of the cooling liquid comprises the following steps: firstly weighing 7000g of ethylene glycol and 2920g of deionized water, stirring for 15 minutes, fully mixing, then sequentially adding 50g of disodium hydrogen phosphate, 20g of sodium molybdate and 10g of sodium nitrate, heating and stirring for 30 minutes until the components are completely dissolved, standing, cooling to room temperature, and filtering to obtain a clear and transparent cooling liquid with a freezing point of-65 ℃.

Example 2

The coolant was prepared in the same manner as in example 1, except that 5600g of ethylene glycol, 50g of dibasic sodium phosphate, 20g of sodium molybdate, 10g of sodium nitrate and 4220g of deionized water were added.

Example 3

The coolant was prepared in the same manner as in example 1 except that 5000g of ethylene glycol, 50g of disodium hydrogenphosphate, 20g of sodium molybdate, 10g of sodium nitrate and 4920g of deionized water were used.

Example 4

A coolant was prepared in the same manner as in example 1, except that 3100g of ethylene glycol, 50g of disodium hydrogenphosphate, 20g of sodium molybdate, 10g of sodium nitrate and 6820g of deionized water were added.

Example 5

The coolant was prepared in the same manner as in example 1 except that 5000g of ethylene glycol, 60g of disodium hydrogenphosphate, 10g of sodium molybdate, 10g of sodium nitrate and 4920g of deionized water were used.

Example 6

The coolant was prepared in the same manner as in example 1 except that 5000g of ethylene glycol, 40g of disodium hydrogenphosphate, 20g of sodium molybdate, 20g of sodium nitrate and 4920g of deionized water were used.

Example 7

The coolant was prepared in the same manner as in example 1 except that 5000g of ethylene glycol, 30g of disodium hydrogenphosphate, 30g of sodium molybdate, 20g of sodium nitrate and 4920g of deionized water were used.

Comparative example 1

The coolant was prepared in the same manner as in example 1 except that 5000g of ethylene glycol, 20g of disodium hydrogenphosphate, 20g of sodium molybdate, 40g of sodium nitrate and 4920g of deionized water were used.

Test example

Test example 1

The physical and chemical properties, glassware corrosion and simulated use corrosion performance of the low-foam electronic equipment coolant in example 4 of the invention are detected, and the data of the detection results are shown in table 1.

Performing glassware corrosion tests by using brass, stainless steel and aluminum alloy test pieces according to the conditions of SH/T0085 method for measuring corrosion of engine coolant (glassware method); 750g of cooling liquid sample is added into a glass ware, the sealed glass ware is placed in an oven and stored for 20 days at 80 ℃, the quality change of test pieces of products before and after the sample test is inspected to evaluate the corrosion performance of the cooling liquid, and the detection result data are shown in table 1.

According to the conditions of SH/T0088 corrosion measurement method for simulated use of engine coolant, a simulated use corrosion test is carried out by using brass, stainless steel and aluminum alloy test pieces, the prepared coolant runs in a cooling system of an electronic equipment test bed, the actual use condition of the coolant of the electronic equipment is simulated, the coolant circulates for 1064 hours under the conditions of certain temperature and flow, the weight loss of a metal test piece and the corrosion condition of the inner surface of each part by visual observation are detected, and the data of the detection result are shown in Table 1.

TABLE 1 analysis of product Properties of example 4

As can be seen from the data in Table 1, the cooling liquid for electronic equipment prepared by the technology provided by the invention not only has physicochemical indexes such as density, PH value and freezing point meeting the reference technical requirements, but also has excellent protective capability on metals for electronic equipment such as brass, stainless steel, aluminum alloy 3003, 4043, 5001 and 6063 as shown by the results of glassware corrosion tests and simulated use corrosion tests, and the weight loss of the test piece is far lower than the standard requirements.

Test example 2

To verify the anti-foaming durability of the cooling fluid of the present invention, example 3 of the present invention was compared to a commercially available cooling fluid for certain brands of electronic equipment to test the tendency of 88 ℃ and 25 ℃ foam before and after one year of operation of the computer server.

Table 2: comparative data for foam tendency Performance test

The requirement of the foam tendency performance in GB 29743-2013 cooling liquid for motor vehicle engines is as follows: the foam volume is less than or equal to 150mL, and the foam disappearance time is less than or equal to 5.0 s. According to the practical use requirement of the cooling liquid of the electronic equipment, the foam tendency performance requirement is defined as follows: the foam volume is less than or equal to 50mL, and the foam disappearance time is less than or equal to 5.0 s.

The data in table 2 show that the cooling liquid of the invention has excellent low-foaming performance compared with the commercially available cooling liquid for electronic equipment of a certain brand added with a defoaming agent, and is far lower than the data requirement of the practical use of the electronic equipment, and in the test of the foaming tendency performance of the cooling liquid after one year of practical use, the cooling liquid of the electronic equipment of the invention still has good low-foaming performance and meets the technical requirement of the reference standard. It can be seen that the cooling fluid of the present invention has anti-foaming durability.

The preferred embodiments of the present disclosure have been described in detail above, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.