Cooling liquid, preparation method thereof and cooling composition

Abstract

The invention provides a cooling liquid, a preparation method thereof and a cooling composition. The cooling liquid comprises liquid polyethylene and an additive, the number-average molecular weight of the liquid polyethylene is 180-185 g / mol, and the molecular weight distribution of the liquid polyethylene is 1.60-1.70. The cooling liquid has the advantages of low viscosity, good oxidation stability, small density, large specific heat capacity and heat conductivity coefficient and the like, and is beneficial to cooling and heat dissipation.

Description

Technical Field

[0001] This invention relates to a coolant, and more particularly to a coolant, its preparation method, and a cooling composition, belonging to the field of coolant preparation technology. Background Technology

[0002] With the continuous penetration of digital technology into all sectors of society, the demand for data center computing power is rapidly increasing, the scale of data centers is constantly expanding, and their energy consumption and carbon emissions are also rising. To ensure the achievement of carbon peaking and carbon neutrality goals, my country has set clear requirements for the Power Usage Effectiveness (PUE) of data centers: the PUE of newly built large-scale and above data centers should be reduced to below 1.3, and the PUE of data centers in severely cold and cold regions should be reduced to below 1.25. Immersion liquid cooling technology has a cooling capacity 1000-3000 times that of traditional air cooling, enabling ultra-high-density cooling and significantly reducing the PUE of data centers.

[0003] Immersion liquid cooling technology involves submerging heat-generating electronic devices in a coolant, relying on the flow of the liquid to remove the heat generated by the devices. Immersion liquid cooling technology offers the following advantages: 1) Highly efficient heat dissipation: Immersion liquid cooling allows for direct contact with the electronic device, providing more efficient heat transfer than traditional air cooling methods; 2) Reduced noise: Since it eliminates the need for mechanical components like fans, immersion liquid cooling significantly reduces noise levels, creating a quieter working environment; 3) Improved reliability and lifespan of electronic devices: Because the coolant evenly covers the entire surface of the electronic device, it better disperses heat, preventing localized overheating and malfunctions. The coolant also acts as a dust and moisture barrier, protecting the electronic device from dust, moisture, and other environmental factors, thus extending its lifespan; 4) Energy saving and environmental protection: Immersion liquid cooling dissipates heat more effectively, reducing energy waste and contributing to improved energy efficiency and environmental friendliness.

[0004] Currently, the coolants used in immersion liquid cooling technology mainly include fluorinated liquids, silicone oils, PAO synthetic oils, and mineral oils. Among them, the extremely high cost and high global warming potential (GWP) of fluorinated liquids make large-scale promotion difficult; low-viscosity silicone oils have a high dielectric constant, which affects high-frequency signal transmission and is difficult to biodegrade; PAO synthetic oils are expensive, costing 2-3 times more than mineral oils, and also have the drawback of being difficult to promote and apply on a large scale; although mineral oils have better economic advantages, they have poor long-term stability, low flash point and ignition point, high volatility, and also contain a small amount of aromatics (1-5%), and are mainly used in the blockchain field where product quality requirements are not high. Summary of the Invention

[0005] This invention provides a coolant, its preparation method, and a cooling composition. The coolant has advantages such as low viscosity, good oxidation stability, low density, high specific heat capacity, and high thermal conductivity, and possesses excellent cooling and heat dissipation performance.

[0006] The present invention also provides a method for preparing a coolant. This preparation method is simple to operate and suitable for large-scale industrial production. The above-mentioned coolant can be obtained by this preparation method.

[0007] The present invention also provides a cooling composition having excellent cooling and heat dissipation performance.

[0008] The present invention provides a coolant comprising liquid polyethylene and additives, wherein the liquid polyethylene has a number-average molecular weight of 180-185 g / mol and a molecular weight distribution of 1.60-1.70.

[0009] Optionally, the kinematic viscosity of the liquid polyethylene at 40°C is 5.5-6.0 mm. 2 / s, open flash point greater than 155℃, ignition point greater than 180℃, acid value less than 0.01mgKOH / g, oxidation stability greater than 600min, and foam stability less than 10mL / mL.

[0010] Optionally, the liquid polyethylene has an ultraviolet absorbance of less than 0.01 in the 260nm-420nm range.

[0011] Optionally, the liquid polyethylene is prepared by a method comprising at least the following process: using ethylene as a raw material and polymerizing it with a nickel-based olefin polymerization catalyst system.

[0012] Optionally, the liquid polyethylene in the coolant has a mass percentage content of 99.491%-99.7988%.

[0013] Optionally, the additive includes at least one of antioxidants, oil-soluble metal passivators, and antifoaming agents.

[0014] Optionally, the antioxidant includes hindered phenolic antioxidants; the hindered phenolic antioxidants include 2,6-di-tert-butyl-p-cresol and / or 2,6-di-tert-butylphenol; and / or, the oil-soluble metal passivator includes triazole metal passivators; the triazole metal passivator includes one or more of methylbenzotriazoles, 1,2,3-triazoles, and benzotriazoles; and / or, the antifoaming agent includes at least one of silicone-type antifoaming agents and polyether-type antifoaming agents; the silicone-type antifoaming agent includes dimethyl silicone oil-type antifoaming agents.

[0015] Optionally, the antioxidant in the coolant has a mass percentage content of 0.2%-0.5%, preferably 0.3%-0.5%; the oil-soluble metal passivating agent in the coolant has a mass percentage content of 0.001%-0.008%, preferably 0.002%-0.005%; and the antifoaming agent in the coolant has a mass percentage content of 0.0001%-0.001%, preferably 0.0003%-0.0005%.

[0016] The present invention also provides a method for preparing a coolant in the first aspect, comprising the following steps: adding the additive to a raw material system including the liquid polyethylene, and mixing to obtain the coolant.

[0017] The present invention also provides a cooling composition, wherein the cooling composition comprises the coolant of the first aspect or the coolant obtained according to the preparation method of the second aspect.

[0018] This invention provides a coolant, its preparation method, and a cooling composition. The coolant comprises the aforementioned liquid polyethylene and additives. The liquid polyethylene has a number-average molecular weight of 180-185 g / mol and a molecular weight distribution of 1.60-1.70. It has a spherical molecular structure, low kinematic viscosity and density, high open flash point and ignition point, and good oxidation stability. This gives the coolant advantages such as low viscosity, low density, high flash point and ignition point, good oxidation stability, and high specific heat capacity and thermal conductivity. The coolant has good fluidity and heat transfer capacity, thus exhibiting excellent cooling and heat dissipation performance, good safety, and good long-term stability. It can be used for immersion liquid cooling technology to cool and dissipate heat from equipment, and is especially suitable for cooling and dissipating heat from servers in large and above data centers, which is beneficial for the stable operation of the equipment. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. 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.

[0020] The first aspect of the present invention provides a coolant, wherein the coolant comprises liquid polyethylene and additives, the liquid polyethylene having a number-average molecular weight of 180-185 g / mol and a molecular weight distribution of 1.60-1.70.

[0021] The coolant of the present invention is applicable to immersion liquid cooling technology, such as single-phase immersion liquid cooling technology, in which the heat-generating equipment is immersed in the above-mentioned coolant, and the heat is carried away by the flow and circulation of the coolant, thereby achieving the effect of cooling and heat dissipation.

[0022] Because the aforementioned coolant includes liquid polyethylene (ETO) and additives, and because liquid polyethylene possesses a variety of excellent properties, it is suitable as a base oil for coolants. Specifically, liquid polyethylene has a number-average molecular weight of 180-185 g / mol and a molecular weight distribution of 1.60-1.70. It has a spherical molecular structure, low kinematic viscosity and density, high open flash point and ignition point, high specific heat capacity and thermal conductivity, thus giving the coolant good circulation fluidity, which is beneficial for cooling and heat dissipation. It also has low volatility, high safety, good oxidation stability, and good stability over long-term use. Furthermore, the aforementioned liquid polyethylene has a low dielectric constant and good insulation properties, which will not affect signal transmission, making this coolant suitable for heat dissipation of data center servers. It can effectively solve various problems faced by the heat dissipation systems of high-performance computing electronic devices; it also has the advantages of low cost and environmental friendliness. Therefore, the coolant of the present invention is significantly superior to coolants using high-viscosity Fischer-Tropsch synthetic oil, dimethyl silicone oil, natural esters, synthetic ester oils or traditional mineral base oils in terms of cooling and heat dissipation performance, insulation performance and environmental protection. In terms of cost, it is superior to coolants composed of high-cost electronic fluorinated liquids or synthetic ester oils. In terms of stability, it is superior to coolants composed of synthetic ester oils or traditional mineral base oils.

[0023] This invention does not specifically limit the types of additives mentioned above. For example, additives that are beneficial to further improve the cooling and heat dissipation performance of the coolant, enhance safety, extend the service life, and improve ease of use can be used.

[0024] The coolant of this invention has low viscosity, low density, high specific heat capacity and thermal conductivity, and excellent cooling and heat dissipation performance. It can be used in immersion liquid cooling technology to cool and dissipate heat from equipment, which is beneficial to the safe and stable operation of equipment. The coolant also has a high open flash point and ignition point, low volatility, high safety, and good stability over long-term use. The coolant has few components, low cost, and good environmental performance, which is in line with the national development concept of green, energy-saving and environmental protection.

[0025] In some embodiments, the kinematic viscosity of the liquid polyethylene at 40°C is 5.5-6.0 mm. 2 A flash point greater than 155℃ and a ignition point greater than 180℃ are beneficial for reducing the viscosity of the coolant, improving its fluidity, and thus facilitating cooling and heat dissipation. At the same time, they also help to increase the flash point and ignition point of the coolant, ensuring the safety of coolant use.

[0026] In some embodiments, the acid value of the liquid polyethylene is less than 0.01 mg KOH / g, the oxidation stability (rotating oxygen bomb, 140°C) is greater than 600 min, and the foaming property (foaming tendency / foaming stability) is less than 10 mL / mL, which is beneficial to improving the oxidation stability and other properties of the coolant. The test methods for the acid value, oxidation stability (rotating oxygen bomb, 140°C), and foaming property (foaming tendency / foaming stability) are described in the following examples section and will not be repeated here.

[0027] In some embodiments, the above-mentioned liquid polyethylene does not contain aromatics and has an ultraviolet absorbance of less than 0.01 at 260nm-420nm. Therefore, the coolant meets the requirements of GB1886.215-2016 standard "Food Additive White Oil", poses no harm to operators, and conforms to the national development concept of green, energy-saving and environmental protection.

[0028] In existing technologies, polyethylene is mostly prepared using ethylene as raw material. The first step is to obtain 1-decene through ethylene oligomerization, and the second step is to obtain polyalphaolefin (PAO) base oil through polymerization-hydrogenation-fractionation. The yield is about 40%. The coolant prepared from PAO base oil has poorer performance than the coolant of this invention.

[0029] The liquid polyethylene used in this invention was purchased from Nanjing Zhongke Kangrun New Material Technology Co., Ltd., or it can be polymerized using ethylene as a raw material and a nickel-based olefin polymerization catalyst system.

[0030] Compared with existing technologies, the company's process for preparing liquid polyethylene is shorter, significantly reduces costs, and produces a higher yield of liquid polyethylene, greater than 95%. It can produce liquid polyethylene with a number average molecular weight of 180-185 g / mol and a molecular weight distribution of 1.60-1.70. This liquid polyethylene has the advantages of narrow molecular weight distribution, low viscosity, low density, high flash point and ignition point, high specific heat capacity and thermal conductivity, which are beneficial to improving the cooling and heat dissipation performance and safety of the coolant and extending its service life.

[0031] The aforementioned liquid polyethylene serves as the base oil for the coolant, and its content in the coolant significantly impacts its cooling and heat dissipation properties, safety, and service life. In some embodiments, the mass percentage of the aforementioned liquid polyethylene in the coolant is 99.491%-99.7988%, which helps ensure excellent cooling and heat dissipation performance, high safety, and long-term stability of the coolant.

[0032] Additives can improve the performance of coolants. Using appropriate types of additives can simplify the coolant composition, save costs, and simultaneously ensure good cooling and heat dissipation performance. In some embodiments, the additives include at least one of antioxidants, oil-soluble metal passivators, and antifoaming agents. Antioxidants help improve the anti-oxidation performance of the coolant, oil-soluble metal passivators help form a protective film on the surface of the cooled equipment to prevent corrosion, and antifoaming agents prevent the coolant from generating foam during operation, thus avoiding interference with heat transfer, insulation, and the normal operation of the circulating pump. Further, it is preferable that the additives include antioxidants, oil-soluble metal passivators, and antifoaming agents. The combined antioxidant and oil-soluble metal passivator provides better anti-oxidation effect, and the combination of the three additives helps to optimize the performance of the coolant at a lower cost.

[0033] Furthermore, the aforementioned antioxidants may include hindered phenolic antioxidants, such as monophenolic antioxidants, specifically including 2,6-di-tert-butyl-p-cresol and / or 2,6-di-tert-butylphenol, preferably 2,6-di-tert-butyl-p-cresol, to improve the antioxidant properties of the coolant; the oil-soluble metal passivator includes triazole metal passivators, which include at least one of benzotriazoles (benzotriazole derivative metal passivators), methylbenzotriazoles (methylbenzotriazole derivative metal passivators), and 1,2,3-triazoles (1,2,3-triazole derivative metal passivators), with methylbenzotriazole derivative metal passivators being preferred, to improve the corrosion resistance of the coolant.

[0034] The antifoaming agent may include at least one of silicone-based antifoaming agents and polyether-based antifoaming agents. The silicone-based antifoaming agent may include a dimethyl silicone oil-based antifoaming agent, which can improve the antifoaming performance of the coolant.

[0035] Furthermore, the antioxidant in the coolant can be 0.2%-0.5% by mass, preferably 0.3%-0.5%, which is beneficial for balancing cost and good antioxidant effect; the oil-soluble metal passivator in the coolant can be 0.001%-0.008% by mass, preferably 0.002%-0.005%, which is beneficial for balancing cost and good antioxidant and anti-corrosion effect; the antifoaming agent in the coolant can be 0.0001-0.001% by mass, preferably 0.0002%-0.001%, and even more preferably 0.0003%-0.0005%, which is beneficial for balancing cost and good anti-foaming effect.

[0036] The second aspect of the present invention provides a method for preparing a coolant according to the first aspect, comprising the following steps: adding an additive to a raw material system including liquid polyethylene, and mixing to obtain a coolant.

[0037] This invention does not impose particular limitations on the above-mentioned mixing conditions. Suitable mixing conditions can be selected based on the type of additive, using the desired material mixing effect as a template. For example, the liquid polyethylene can be preheated to improve its fluidity and solubility, thereby enhancing the mixing effect between the additive and the liquid polyethylene.

[0038] The above preparation method is simple to operate and easy to promote industrially. The coolant with good cooling and heat dissipation performance can be obtained through the above preparation method.

[0039] Specifically, when the above-mentioned additives include antioxidants, oil-soluble metal passivators, and antifoaming agents, in order to ensure the performance and quality of the coolant, the coolant can be prepared by a method including the following steps:

[0040] 1) Antioxidant and oil-soluble metal passivating agent are added to a portion of liquid polyethylene to obtain the first mother liquor;

[0041] 2) The antifoaming agent was added to a portion of liquid polyethylene and ground to obtain the second mother liquor;

[0042] 3) Mix the first mother liquor, the second mother liquor and the remaining liquid polyethylene to obtain a coolant.

[0043] To ensure the mixing effect of antioxidants, oil-soluble metal passivators and liquid polyethylene, in step 1), a portion of the polyethylene can be preheated to a certain temperature, such as 80°C, and then the antioxidants and oil-soluble metal passivators can be added. The mixture is then stirred for a certain time, such as 30 minutes, to obtain the first mother liquor.

[0044] In step 2), to better mix the antifoaming agent and liquid polyethylene, the mixture can be ground for 10 minutes to obtain a second mother liquor. This invention is not limited to the above-described grinding method; for example, a colloid mill can be used for cyclic grinding.

[0045] In step 3), after mixing the first mother liquor, the second mother liquor, and the remaining liquid polyethylene, it can be stirred for 30 minutes and then left to stand for 1 hour, which is beneficial to improving the performance of the coolant.

[0046] The aforementioned liquid polyethylene can be purchased from Nanjing Zhongke Kangrun New Material Technology Co., Ltd.

[0047] A third aspect of the present invention provides a cooling composition, wherein the cooling composition comprises the coolant of the first aspect or the coolant obtained by the preparation method of the second aspect.

[0048] The above-mentioned cooling composition, due to including the coolant of the present invention, also has the advantages of low viscosity, low density, high flash point and ignition point, high specific heat capacity and thermal conductivity, and good cooling and heat dissipation performance. Furthermore, in order to expand the application field of the above-mentioned cooling composition, it can be modified according to its actual needs, for example, by adding some other components that improve the fluidity, ignition point, corrosion resistance, durability and other properties of the cooling composition. The present invention does not limit the specific types and amounts of the above-mentioned other components, which can be determined according to the actual application.

[0049] The coolant and its preparation method of the present invention will be described in more detail below through specific embodiments.

[0050] Example 1

[0051] This embodiment provides a coolant comprising, by mass percentage, 0.3% antioxidant, 0.005% oil-soluble metal passivator, 0.0005% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal passivator is methylbenzotriazole derivative metal passivator, and the antifoaming agent is dimethyl silicone oil type antifoaming agent.

[0052] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0053] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. was used. The properties of the liquid polyethylene are shown in Table 2 (Liquid-1). The number-average molecular weight of this liquid polyethylene is 183 g / mol, the molecular weight distribution is 1.68, and its viscosity at 40℃ is 5.712 mm. 2 / s, with an open flash point of 160℃ and an ignition point of 182℃;

[0054] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of methylbenzotriazole derivative metal passivating agent to the above liquid polyethylene to obtain the first mother liquor.

[0055] 3) Add 0.25g of organosilicon antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10min to obtain the second mother liquor;

[0056] 4) Mix the first mother liquor, the second mother liquor and 47.84725 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned coolant.

[0057] Example 2

[0058] This embodiment provides a coolant comprising, by mass percentage, 0.3% antioxidant, 0.005% oil-soluble metal passivator, 0.0005% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal passivator is methylbenzotriazole derivative metal passivator, and the antifoaming agent is dimethyl silicone oil type antifoaming agent.

[0059] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0060] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. was used. Its properties are shown in Table 2 (Liquid-2). This liquid polyethylene has a number-average molecular weight of 184 g / mol, a molecular weight distribution of 1.62, and a viscosity of 5.788 mmHg at 40℃. 2 / s, with an open flash point of 163℃ and an ignition point of 185℃;

[0061] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of methylbenzotriazole derivative metal passivating agent to the above liquid polyethylene to obtain the first mother liquor.

[0062] 3) Add 0.25g of dimethyl silicone oil-type antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10 minutes to obtain the second mother liquor;

[0063] 4) Mix the first mother liquor, the second mother liquor and 47.84725 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned coolant.

[0064] Example 3

[0065] This embodiment provides a coolant comprising, by mass percentage, 0.3% antioxidant, 0.005% oil-soluble metal passivator, 0.0005% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal passivator is methylbenzotriazole derivative metal passivator, and the antifoaming agent is dimethyl silicone oil type antifoaming agent.

[0066] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0067] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. was used. Its properties are shown in Table 2 (Liquid-3). This liquid polyethylene has a number-average molecular weight of 180 g / mol, a molecular weight distribution of 1.62, and a viscosity of 5.687 mmHg at 40℃. 2 / s, with an open flash point of 162℃ and an ignition point of 184℃;

[0068] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of methylbenzotriazole derivative metal passivating agent to the above liquid polyethylene to obtain the first mother liquor.

[0069] 3) Add 0.25g of dimethyl silicone oil-type antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10 minutes to obtain the second mother liquor;

[0070] 4) Mix the first mother liquor, the second mother liquor and 47.84725 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned coolant.

[0071] Example 4

[0072] This embodiment provides a coolant comprising, by mass percentage, 0.3% antioxidant, 0.005% oil-soluble metal passivator, 0.0005% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal passivator is 1,2,4-triazole derivative metal passivator, and the antifoaming agent is an organosilicon-type antifoaming agent.

[0073] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0074] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. was used. Its properties are shown in Table 2 (Liquid-1). This liquid polyethylene has a number-average molecular weight of 183 g / mol, a molecular weight distribution of 1.68, and a viscosity of 5.712 mmHg at 40℃. 2 / s, with an open flash point of 160℃ and an ignition point of 182℃;

[0075] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of 1,2,4-triazole derivative metal passivating agent to the liquid polyethylene to obtain the first mother liquor.

[0076] 3) Add 0.25g of dimethyl silicone oil-type antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10 minutes to obtain the second mother liquor;

[0077] 4) Mix the first mother liquor, the second mother liquor and 47.84725 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned coolant.

[0078] Example 5

[0079] This embodiment provides a coolant comprising, by mass percentage, 0.3% antioxidant, 0.005% oil-soluble metal passivator, 0.0005% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal passivator is a benzotriazole derivative metal passivator, and the antifoaming agent is an organosilicon antifoaming agent.

[0080] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0081] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. was used. Its properties are shown in Table 2 (Liquid-1). This liquid polyethylene has a number-average molecular weight of 183 g / mol, a molecular weight distribution of 1.68, and a viscosity of 5.712 mmHg at 40℃. 2 / s, with an open flash point of 160℃ and an ignition point of 182℃;

[0082] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of benzotriazole derivative metal passivating agent to the liquid polyethylene to obtain the first mother liquor.

[0083] 3) Add 0.25g of dimethyl silicone oil-type antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10 minutes to obtain the second mother liquor;

[0084] 4) Mix the first mother liquor, the second mother liquor and 47.84725 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned coolant.

[0085] Example 6

[0086] This embodiment provides a coolant comprising, by mass percentage, 0.3% antioxidant, 0.005% oil-soluble metal passivator, 0.0005% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal passivator is methylbenzotriazole derivative metal passivator, and the antifoaming agent is a polyether-type antifoaming agent.

[0087] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0088] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. was used. Its properties are shown in Table 2 (Liquid-1). This liquid polyethylene has a number-average molecular weight of 183 g / mol, a molecular weight distribution of 1.68, and a viscosity of 5.712 mmHg at 40℃. 2 / s, with an open flash point of 160℃ and an ignition point of 182℃;

[0089] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of methylbenzotriazole derivative metal passivating agent to the above liquid polyethylene to obtain the first mother liquor.

[0090] 3) Add 0.25g of polyether-type antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10 minutes to obtain the second mother liquor;

[0091] 4) Mix the first mother liquor, the second mother liquor and 47.84725 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned coolant.

[0092] Example 7

[0093] This embodiment provides a coolant comprising, by mass percentage, 0.3% antioxidant, 0.005% oil-soluble metal passivator, 0.0005% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butylphenol antioxidant, the oil-soluble metal passivator is methylbenzotriazole derivative metal passivator, and the antifoaming agent is dimethyl silicone oil type antifoaming agent.

[0094] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0095] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. was used. Its properties are shown in Table 2 (Liquid-1). This liquid polyethylene has a number-average molecular weight of 183 g / mol, a molecular weight distribution of 1.68, and a viscosity of 5.712 mmHg at 40℃. 2 / s, with an open flash point of 160℃ and an ignition point of 182℃;

[0096] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of methylbenzotriazole derivative metal passivating agent to the above liquid polyethylene to obtain the first mother liquor.

[0097] 3) Add 0.25g of organosilicon antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10min to obtain the second mother liquor;

[0098] 4) Mix the first mother liquor, the second mother liquor and 47.84725 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned coolant.

[0099] Example 8

[0100] This embodiment provides a coolant comprising, by mass percentage, 0.5% antioxidant, 0.005% oil-soluble metal passivator, 0.0005% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal passivator is methylbenzotriazole derivative metal passivator, and the antifoaming agent is dimethyl silicone oil type antifoaming agent.

[0101] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0102] 1) The liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. has the following properties as shown in Table 2 (Liquid-1). The number-average molecular weight of this liquid polyethylene is 187 g / mol, the molecular weight distribution is 1.61, its viscosity at 40℃ is 5.771 mm2 / s, and its open flash point is 152℃.

[0103] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 250 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of methylbenzotriazole derivative metal passivating agent to the liquid polyethylene to obtain the first mother liquor.

[0104] 3) Add 0.25g of organosilicon antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10min to obtain the second mother liquor;

[0105] 4) Mix the first mother liquor, the second mother liquor and 47.74725 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned coolant.

[0106] Example 9

[0107] This embodiment provides a coolant comprising, by mass percentage, 0.3% antioxidant, 0.002% oil-soluble metal passivator, 0.0005% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal passivator is methylbenzotriazole derivative metal passivator, and the antifoaming agent is dimethyl silicone oil type antifoaming agent.

[0108] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0109] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. was used. Its properties are shown in Table 2 (Liquid-1). This liquid polyethylene has a number-average molecular weight of 183 g / mol, a molecular weight distribution of 1.68, and a viscosity of 5.712 mmHg at 40℃. 2 / s, with an open flash point of 160℃ and an ignition point of 182℃;

[0110] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 1 g of methylbenzotriazole derivative metal passivating agent to the liquid polyethylene to obtain the first mother liquor.

[0111] 3) Add 0.25g of organosilicon antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10min to obtain the second mother liquor;

[0112] 4) Mix the first mother liquor, the second mother liquor and 47.84975 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned coolant.

[0113] Example 10

[0114] This embodiment provides a coolant comprising, by mass percentage, 0.3% antioxidant, 0.005% oil-soluble metal passivator, 0.0003% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal passivator is methylbenzotriazole derivative metal passivator, and the antifoaming agent is dimethyl silicone oil type antifoaming agent.

[0115] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0116] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. was used. Its properties are shown in Table 2 (Liquid-1). This liquid polyethylene has a number-average molecular weight of 183 g / mol, a molecular weight distribution of 1.68, and a viscosity of 5.712 mmHg at 40℃. 2 / s, with an open flash point of 160℃ and an ignition point of 182℃;

[0117] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of methylbenzotriazole derivative metal passivating agent to the above liquid polyethylene to obtain the first mother liquor.

[0118] 3) Add 0.15g of organosilicon antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10min to obtain the second mother liquor;

[0119] 4) Mix the first mother liquor, the second mother liquor and 47.84735 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned coolant.

[0120] Example 11

[0121] This embodiment provides a coolant comprising, by mass percentage, 0.3% antioxidant, 0.005% oil-soluble metal passivator, 0.0005% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal passivator is methylbenzotriazole derivative metal passivator, and the antifoaming agent is dimethyl silicone oil type antifoaming agent.

[0122] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0123] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. was used. Its properties are shown in Table 2 (Liquid-4). This liquid polyethylene has a number-average molecular weight of 185 g / mol, a molecular weight distribution of 1.61, and a viscosity of 5.971 mmHg at 40℃. 2 / s, open flash point is 170℃, ignition point is 187℃;

[0124] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of methylbenzotriazole derivative metal passivating agent to the above liquid polyethylene to obtain the first mother liquor.

[0125] 3) Add 0.25g of organosilicon antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10min to obtain the second mother liquor;

[0126] 4) Mix the first mother liquor, the second mother liquor and 47.84725 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned coolant.

[0127] Example 12

[0128] This embodiment provides a coolant comprising, by mass percentage, 0.3% antioxidant, 0.005% oil-soluble metal passivator, 0.0005% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal passivator is methylbenzotriazole derivative metal passivator, and the antifoaming agent is dimethyl silicone oil type antifoaming agent.

[0129] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0130] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. was used. Its properties are shown in Table 2 (Liquid-5). This liquid polyethylene has a number-average molecular weight of 185 g / mol, a molecular weight distribution of 1.69, and a viscosity of 5.810 mmHg at 40℃. 2 / s, open flash point is 1560℃, ignition point is 180℃;

[0131] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of methylbenzotriazole derivative metal passivating agent to the above liquid polyethylene to obtain the first mother liquor.

[0132] 3) Add 0.25g of organosilicon antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10min to obtain the second mother liquor;

[0133] 4) Mix the first mother liquor, the second mother liquor and 47.84725 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned coolant.

[0134] Example 13

[0135] This embodiment provides a coolant comprising, by mass percentage, 0.2% antioxidant, 0.005% oil-soluble metal passivator, 0.0005% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal passivator is methylbenzotriazole derivative metal passivator, and the antifoaming agent is dimethyl silicone oil type antifoaming agent.

[0136] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0137] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. was used. Its properties are shown in Table 2 (Liquid-1). This liquid polyethylene has a number-average molecular weight of 183 g / mol, a molecular weight distribution of 1.68, and a viscosity of 5.712 mmHg at 40℃. 2 / s, with an open flash point of 160℃ and an ignition point of 182℃;

[0138] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 100 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of methylbenzotriazole derivative metal passivating agent to the liquid polyethylene to obtain the first mother liquor.

[0139] 3) Add 0.25g of organosilicon antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10min to obtain the second mother liquor;

[0140] 4) Mix the first mother liquor, the second mother liquor and 47.89725 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned coolant.

[0141] Example 14

[0142] This embodiment provides a coolant comprising, by mass percentage, 0.3% antioxidant, 0.001% oil-soluble metal passivator, 0.0005% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal passivator is methylbenzotriazole derivative metal passivator, and the antifoaming agent is dimethyl silicone oil type antifoaming agent.

[0143] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0144] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. was used. Its properties are shown in Table 2 (Liquid-1). This liquid polyethylene has a number-average molecular weight of 183 g / mol, a molecular weight distribution of 1.68, and a viscosity of 5.712 mmHg at 40℃. 2 / s, with an open flash point of 160℃ and an ignition point of 182℃;

[0145] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 0.5 g of methylbenzotriazole derivative metal passivating agent to the above liquid polyethylene to obtain the first mother liquor.

[0146] 3) Add 0.25g of organosilicon antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10min to obtain the second mother liquor;

[0147] 4) Mix the first mother liquor, the second mother liquor and 47.84925 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned coolant.

[0148] Example 15

[0149] This embodiment provides a coolant comprising, by mass percentage, 0.3% antioxidant, 0.008% oil-soluble metal passivator, 0.0005% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal passivator is methylbenzotriazole derivative metal passivator, and the antifoaming agent is dimethyl silicone oil type antifoaming agent.

[0150] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0151] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. was used. Its properties are shown in Table 2 (Liquid-1). This liquid polyethylene has a number-average molecular weight of 183 g / mol, a molecular weight distribution of 1.68, and a viscosity of 5.712 mmHg at 40℃. 2 / s, with an open flash point of 160℃ and an ignition point of 182℃;

[0152] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 4 g of methylbenzotriazole derivative metal passivating agent to the above liquid polyethylene to obtain the first mother liquor.

[0153] 3) Add 0.25g of organosilicon antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10min to obtain the second mother liquor;

[0154] 4) Mix the first mother liquor, the second mother liquor and 47.84575 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned coolant.

[0155] Example 16

[0156] This embodiment provides a coolant comprising, by mass percentage, 0.3% antioxidant, 0.005% oil-soluble metal passivator, 0.0002% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal passivator is methylbenzotriazole derivative metal passivator, and the antifoaming agent is dimethyl silicone oil type antifoaming agent.

[0157] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0158] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. was used. Its properties are shown in Table 2 (Liquid-1). This liquid polyethylene has a number-average molecular weight of 183 g / mol, a molecular weight distribution of 1.68, and a viscosity of 5.712 mmHg at 40℃. 2 / s, with an open flash point of 160℃ and an ignition point of 182℃;

[0159] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of methylbenzotriazole derivative metal passivating agent to the above liquid polyethylene to obtain the first mother liquor.

[0160] 3) Add 0.1g of organosilicon antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10 minutes to obtain the second mother liquor;

[0161] 4) Mix the first mother liquor, the second mother liquor and 47.8474 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned coolant.

[0162] Comparative Example 1

[0163] This embodiment provides a coolant comprising, by mass percentage, 0.3% antioxidant, 0.005% oil-soluble metal passivator, 0.0005% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal passivator is methylbenzotriazole derivative metal passivator, and the antifoaming agent is dimethyl silicone oil type antifoaming agent.

[0164] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0165] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. was used. Its properties are shown in Table 2 (Liquid-6). This liquid polyethylene has a number-average molecular weight of 185 g / mol, a molecular weight distribution of 1.70, and a viscosity of 5.892 mmHg at 40℃. 2 / s, with an open flash point of 154℃.

[0166] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of methylbenzotriazole derivative metal passivating agent to the above liquid polyethylene to obtain the first mother liquor.

[0167] 3) Add 0.25g of organosilicon antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10min to obtain the second mother liquor;

[0168] 4) Mix the first mother liquor, the second mother liquor and 47.84725 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned coolant.

[0169] Comparative Example 2

[0170] This embodiment provides a coolant comprising, by mass percentage, 0.3% antioxidant, 0.005% oil-soluble metal passivator, 0.0005% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal passivator is methylbenzotriazole derivative metal passivator, and the antifoaming agent is dimethyl silicone oil type antifoaming agent.

[0171] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0172] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. was used. Its properties are shown in Table 2 (Liquid-7). This liquid polyethylene has a number-average molecular weight of 190 g / mol, a molecular weight distribution of 1.63, and a viscosity of 6.082 mmHg at 40℃. 2 / s, with an open flash point of 172℃.

[0173] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of methylbenzotriazole derivative metal passivating agent to the above liquid polyethylene to obtain the first mother liquor.

[0174] 3) Add 0.25g of organosilicon antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10min to obtain the second mother liquor;

[0175] 4) Mix the first mother liquor, the second mother liquor and 47.84725 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned coolant.

[0176] Comparative Example 3

[0177] This embodiment provides a coolant comprising, by mass percentage, 0.1% antioxidant, 0.005% oil-soluble metal passivator, 0.0005% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal passivator is methylbenzotriazole derivative metal passivator, and the antifoaming agent is dimethyl silicone oil type antifoaming agent.

[0178] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0179] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. was used. Its properties are shown in Table 2 (Liquid-1). This liquid polyethylene has a number-average molecular weight of 183 g / mol, a molecular weight distribution of 1.68, and a viscosity of 5.712 mmHg at 40℃. 2 / s, with an open flash point of 160℃ and an ignition point of 182℃;

[0180] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 50 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of methylbenzotriazole derivative metal passivating agent to the above liquid polyethylene to obtain the first mother liquor.

[0181] 3) Add 0.25g of organosilicon antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10min to obtain the second mother liquor;

[0182] 4) Mix the first mother liquor, the second mother liquor and 47.85725 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned coolant.

[0183] Comparative Example 4

[0184] This embodiment provides a coolant comprising, by mass percentage, 0.3% antioxidant, 0.0005% oil-soluble metal passivator, 0.0005% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal passivator is methylbenzotriazole derivative metal passivator, and the antifoaming agent is dimethyl silicone oil type antifoaming agent.

[0185] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0186] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. was used. Its properties are shown in Table 2 (Liquid-1). This liquid polyethylene has a number-average molecular weight of 183 g / mol, a molecular weight distribution of 1.68, and a viscosity of 5.712 mmHg at 40℃. 2 / s, with an open flash point of 160℃ and an ignition point of 182℃;

[0187] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 0.25 g of methylbenzotriazole derivative metal passivating agent to the above liquid polyethylene to obtain the first mother liquor.

[0188] 3) Add 0.25g of organosilicon antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10min to obtain the second mother liquor;

[0189] 4) Mix the first mother liquor, the second mother liquor and 47.8495 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned cooling liquid.

[0190] Comparative Example 5

[0191] This embodiment provides a coolant comprising, by mass percentage, 0.3% antioxidant, 0.009% oil-soluble metal passivator, 0.0005% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal passivator is methylbenzotriazole derivative metal passivator, and the antifoaming agent is dimethyl silicone oil type antifoaming agent.

[0192] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0193] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. was used. Its properties are shown in Table 2 (Liquid-1). This liquid polyethylene has a number-average molecular weight of 183 g / mol, a molecular weight distribution of 1.68, and a viscosity of 5.712 mmHg at 40℃. 2 / s, with an open flash point of 160℃ and an ignition point of 182℃;

[0194] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 4.5 g of methylbenzotriazole derivative metal passivating agent to the above liquid polyethylene to obtain the first mother liquor.

[0195] 3) Add 0.25g of organosilicon antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10min to obtain the second mother liquor;

[0196] 4) Mix the first mother liquor, the second mother liquor and 47.84525 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned coolant.

[0197] Comparative Example 6

[0198] This embodiment provides a coolant comprising, by mass percentage, 0.3% antioxidant, 0.005% oil-soluble metal passivator, 0.0001% antifoaming agent, and the balance being liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal passivator is methylbenzotriazole derivative metal passivator, and the antifoaming agent is dimethyl silicone oil type antifoaming agent.

[0199] This embodiment also provides a method for preparing the above-mentioned coolant, including the following steps:

[0200] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. was used. Its properties are shown in Table 2 (Liquid-1). This liquid polyethylene has a number-average molecular weight of 183 g / mol, a molecular weight distribution of 1.68, and a viscosity of 5.712 mmHg at 40℃. 2 / s, with an open flash point of 160℃ and an ignition point of 182℃;

[0201] 2) Weigh 1 kg of liquid polyethylene and heat it to 80°C. Then add 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of methylbenzotriazole derivative metal passivating agent to the above liquid polyethylene to obtain the first mother liquor.

[0202] 3) Add 0.05g of organosilicon antifoaming agent to 1kg of liquid polyethylene and grind it in a colloid mill for 10min to obtain the second mother liquor;

[0203] 4) Mix the first mother liquor with 47.84745 kg of liquid polyethylene, stir for 30 min and let stand for 1 h to obtain the above-mentioned coolant.

[0204] The following parameters of the raw materials and the prepared coolant in the above embodiments and comparative examples were tested. The test parameters and test methods are shown in Table 1, the properties of the raw materials are shown in Table 2, and the test results of the coolant are shown in Tables 3 and 4.

[0205] Table 1

[0206]

[0207]

[0208] Table 2

[0209]

[0210] Table 3

[0211]

[0212]

[0213] Table 4

[0214]

[0215]

[0216] Data Analysis:

[0217] In Examples 1-10, liquid polyethylene with a number-average molecular weight of 180-185 g / mol and a molecular weight distribution of 1.60-1.70 was used, with a mass percentage content of 99.491-99.7988%, antioxidant of 0.3-0.5%, metal passivator of 0.002-0.005%, and antifoaming agent of 0.0003-0.0005%. The resulting coolant met the index requirements set forth in this patent and also met the index requirements of GB1886.215-2016 standard "Food Additive White Oil".

[0218] Data from Example 11 shows that when the number-average molecular weight of liquid polyethylene is 185 g / mol, the viscosity of the blended coolant at 40°C is relatively high. Data from Example 12 shows that when the molecular weight distribution of liquid polyethylene is 1.69, the open flash point and ignition point of the blended coolant are relatively high. Data from Example 13 shows that when the antioxidant content is less than 0.3% (0.2%), the rotational bomb value of the blended coolant is relatively low. Data from Example 14 shows that when the metal passivator content is less than 0.002% (0.001%), the rotational bomb value of the blended coolant is relatively low. Data from Example 15 shows that when the content is greater than 0.005% (0.008%), the rotational acid value of the blended coolant is relatively high. Data from Example 16 shows that when the antifoaming agent content is less than 0.0003% (0.0002%), the foaming property is relatively high.

[0219] Comparative Example 1 shows that when the molecular weight distribution of liquid polyethylene is higher than 1.70 but is between 1.72, the open flash point and ignition point of the blended coolant do not meet the requirements. Comparative Example 2 shows that when the number-average molecular weight of liquid polyethylene exceeds 185 g / mol but is between 190 g / mol, the viscosity of the blended coolant at 40℃ exceeds the requirements. Comparative Example 3 shows that when the antioxidant content is lower than 0.2% but is between 0.1%, the rotating bomb value of the blended coolant is unqualified. Comparative Example 4 shows that when the metal passivator content is lower than 0.001% but is between 0.0005%, the rotating bomb value of the blended coolant is unqualified. Comparative Example 5 shows that when the metal passivator content is higher than 0.008% but is between 0.009%, the acid value of the blended coolant is unqualified. Comparative Example 6 shows that when the antifoaming agent content is lower than 0.0002% but is between 0.0001%, the foaming property of the blended coolant is unqualified.

[0220] 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 or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A coolant, characterized in that, The coolant comprises liquid polyethylene and additives, wherein the liquid polyethylene has a number-average molecular weight of 180-185 g / mol and a molecular weight distribution of 1.60-1.

70.

2. The coolant according to claim 1, characterized in that, The kinematic viscosity of the liquid polyethylene at 40°C is 5.5-6.0 mm. 2 / s, open flash point greater than 155℃, ignition point greater than 180℃, acid value less than 0.01mgKOH / g, oxidation stability greater than 600min, and foam stability less than 10mL / mL.

3. The coolant according to claim 1 or 2, characterized in that, The liquid polyethylene has an ultraviolet absorbance of less than 0.01 in the 260nm-420nm range.

4. The coolant according to any one of claims 1-3, characterized in that, The liquid polyethylene is prepared by a method comprising at least the following processes: It is produced by polymerization of ethylene using a nickel-based olefin polymerization catalyst system.

5. The coolant according to any one of claims 1-4, characterized in that, The liquid polyethylene in the coolant has a mass percentage content of 99.491%-99.7988%.

6. The coolant according to any one of claims 1-5, characterized in that, The additives include at least one of antioxidants, oil-soluble metal passivators, and antifoaming agents.

7. The coolant according to claim 6, characterized in that, The antioxidants include hindered phenolic antioxidants; the hindered phenolic antioxidants include 2,6-di-tert-butyl-p-cresol and / or 2,6-di-tert-butylphenol; And / or, the oil-soluble metal passivating agent includes triazole metal passivating agents; the triazole metal passivating agents include one or more of methylbenzotriazoles, 1,2,3-triazoles, and benzotriazoles; And / or, the antifoaming agent includes at least one of silicone-based antifoaming agents and polyether-based antifoaming agents; the silicone-based antifoaming agent includes dimethyl silicone oil-based antifoaming agents.

8. The coolant according to claim 7, characterized in that, The antioxidant in the coolant has a mass percentage of 0.2%-0.5%, preferably 0.3%-0.5%; The oil-soluble metal passivating agent has a mass percentage content of 0.001%-0.008% in the coolant, preferably 0.002%-0.005%; The antifoaming agent has a mass percentage content of 0.0001%-0.001% in the coolant, preferably 0.0003%-0.0005%.

9. A method for preparing the coolant according to any one of claims 1-8, characterized in that, Includes the following steps: The additive is added to a raw material system including the liquid polyethylene, and the mixture is then used to obtain the coolant.

10. A cooling composition, characterized in that, The cooling composition comprises the coolant according to any one of claims 1-8 or the coolant obtained according to the preparation method of claim 9.

Images