Coolant, preparation method therefor, and coolant composition

Abstract

Provided in the present invention are a coolant, a preparation method therefor, and a coolant composition. The coolant comprises liquid polyethylene and an additive. The liquid polyethylene has a number average molecular weight of 180-185g / mol and a molecular weight distribution of 1.60-1.70. The coolant has the advantages of low viscosity, good oxidation stability, low density, high specific heat capacity, and high thermal conductivity, and is conducive to cooling and heat dissipation.

Description

Cooling liquid, method for preparing the same and cooling composition

[0001] The present application claims priority to the Chinese patent application No. 202411318643.0, filed on September 20, 2024, and entitled "Cooling liquid, method for preparing the same and cooling composition", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to a cooling liquid, in particular to a cooling liquid, a method for preparing the same and a cooling composition, and belongs to the technical field of cooling liquid preparation. BACKGROUND

[0003] With the continuous penetration of digital technology into all fields of society, the demand for data center computing power in the whole society is growing rapidly, and the scale of data centers is also expanding, and their energy consumption is also growing, and carbon emissions are also increasing. In order to ensure the realization of the carbon peak and carbon neutralization target, clear requirements are put forward for the energy efficiency utilization rate PUE of data centers, specifically: the PUE of newly built large and above data centers is reduced to 1.3 or below, and the PUE of data centers in severe cold and cold regions is reduced to 1.25 or below. The cooling capacity of immersion liquid cooling technology is 1000-3000 times that of traditional air cooling, which can realize ultra-high density refrigeration and greatly reduce the PUE of data centers.

[0004] Immersion liquid cooling technology immerses the heat-generating electronic equipment in the cooling liquid, and relies on the flow of the cooling liquid to take away the heat generated by the electronic equipment. Immersion liquid cooling technology has the following advantages: 1) high efficiency of heat dissipation, immersion liquid cooling technology can realize direct contact with electronic equipment, thereby providing more efficient heat conduction than traditional air cooling methods; 2) reduce noise, as there is no need for fans and other mechanical components, immersion liquid cooling technology can significantly reduce noise levels, which is conducive to creating a quiet working environment; 3) improve the reliability and life of electronic equipment, as the cooling liquid can evenly cover the entire surface of the electronic equipment, it can better disperse heat and avoid local overheating of the electronic equipment, which can cause failure, at the same time, the cooling liquid can also play a role in dustproof and moistureproof, which can protect the electronic equipment from the influence of dust, moisture and other external environments, thereby prolonging the service life of the equipment; 4) energy saving and environmental protection, immersion liquid cooling technology can more concentratedly dissipate heat, reducing energy waste, which helps to improve energy efficiency and environmental protection.

[0005] Currently, the cooling liquid used in the immersion liquid cooling technology mainly includes fluorinated liquid, silicone oil, PAO synthetic oil and mineral oil, etc. Among them, the fluorinated liquid is difficult to be popularized on a large scale due to its extremely high cost and high global warming potential (GWP); the low-viscosity silicone oil has a relatively high dielectric constant, which affects the high-frequency signal transmission and is difficult to be biodegraded; the PAO synthetic oil is 2-3 times as high as the mineral oil in price, and also has the defect of being difficult to be popularized on a large scale; the mineral oil has good economy, but has poor long-period stability, low flash point and ignition point, high volatility, and also contains a small amount of aromatic hydrocarbons (1-5%), and is mainly applied to the blockchain field with low product quality requirements. SUMMARY

[0006] The application provides a cooling liquid, a preparation method thereof and a cooling composition, which has the advantages of low viscosity, good oxidation stability, small density, large specific heat capacity and thermal conductivity, and excellent cooling and heat dissipation performance.

[0007] The application also provides a preparation method of the cooling liquid, which is simple in operation, suitable for industrialized mass production, and can obtain the above cooling liquid.

[0008] The application also provides a cooling composition, which has excellent cooling and heat dissipation performance.

[0009] The application provides a cooling liquid, which comprises liquid polyethylene and an additive, and the number average molecular weight of the liquid polyethylene is 180-185 g / mol, and the molecular weight distribution is 1.60-1.70.

[0010] Optionally, the liquid polyethylene has an open flash point greater than 155℃, an ignition point greater than 180℃, an acid value less than 0.01 mgKOH / g, an oxidation stability greater than 600 min, and a foam stability less than 10 mL / mL.

[0011] Optionally, the liquid polyethylene has an ultraviolet absorbance less than 0.01 at 260 nm-420 nm.

[0012] Optionally, the liquid polyethylene is prepared by a method comprising at least the following process: using ethylene as a raw material and using a nickel-based olefin polymerization catalyst system for polymerization.

[0013] Optionally, the mass percentage content of the liquid polyethylene in the cooling liquid is 99.491%-99.7988%.

[0014] Optionally, the additive comprises at least one of an antioxidant, an oil-soluble metal deactivator and an antifoaming agent.

[0015] Optionally, the antioxidant comprises a hindered phenolic antioxidant; the hindered phenolic antioxidant comprises 2,6-di-tert-butyl-p-cresol and / or 2,6-di-tert-butyl phenol; and / or, the oil-soluble metal deactivator comprises a triazole metal deactivator; the triazole metal deactivator comprises one or more of a methylbenzotriazole, a 1,2,3-triazole, and a benzotriazole; and / or, the antifoam agent comprises at least one of a silicone type antifoam agent and a polyether type antifoam agent; the silicone type antifoam agent comprises a dimethyl silicone oil type antifoam agent.

[0016] Optionally, the mass percentage content of the antioxidant in the coolant is 0.2% to 0.5%, preferably 0.3% to 0.5%; the mass percentage content of the oil-soluble metal deactivator in the coolant is 0.001% to 0.008%, preferably 0.002% to 0.005%; and the mass percentage content of the antifoam agent in the coolant is 0.0001% to 0.001%, preferably 0.0003% to 0.0005%.

[0017] The present application also provides a preparation method of the coolant of the first aspect, comprising the following steps: adding the additive to a raw material system comprising the liquid polyethylene, and mixing to obtain the coolant.

[0018] The present application also 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.

[0019] The present application provides a coolant, a preparation method thereof, and a cooling composition. The coolant comprises a liquid polyethylene and an additive. The liquid polyethylene has a number average molecular weight of 180-185 g / mol, a molecular weight distribution of 1.60-1.70, and a spherical-like molecular structure. The liquid polyethylene has low kinematic viscosity and density, high open flash point and ignition point, and good oxidation stability. The coolant also has low viscosity, small density, high flash point and ignition point, good oxidation stability, large specific heat capacity, and large thermal conductivity. The coolant has good flowability and heat transfer ability, and thus has excellent cooling performance, good safety, and good long-term stability. The coolant can be used for cooling equipment by immersion liquid cooling technology, and is particularly suitable for cooling large data center servers. DETAILED DESCRIPTION

[0020] In order to make the objects, technical solutions and advantages of the present application clearer, the following will combine the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0021] The present application provides a cooling liquid in the first aspect, wherein the cooling liquid comprises liquid polyethylene and an additive, and the liquid polyethylene has a number average molecular weight of 180-185 g / mol and a molecular weight distribution of 1.60-1.70.

[0022] The cooling liquid of the present application is suitable for submersion liquid cooling technology, such as single-phase submersion liquid cooling technology, and the heat-generating equipment is immersed in the cooling liquid, and the heat is taken away by the flow circulation of the cooling liquid, thereby achieving the effect of cooling and heat dissipation.

[0023] The cooling liquid comprises liquid polyethylene (ETO) and an additive, and the liquid polyethylene has various excellent properties, making it suitable as a base oil for the cooling liquid. Specifically, the liquid polyethylene has a number average molecular weight of 180-185 g / mol and a molecular weight distribution of 1.60-1.70, and has a spherical molecular structure, low kinematic viscosity and density, high open flash point and ignition point, high specific heat capacity and thermal conductivity, thereby making the cooling liquid have good circulation flow, being beneficial to cooling and heat dissipation, and having low volatility, high safety, good oxidation stability, and good stability during long-term use. In addition, the liquid polyethylene also has low dielectric constant and good insulation performance, and does not affect signal transmission, making the cooling liquid suitable for heat dissipation of data center servers, and effectively solving various problems faced by the heat dissipation system of high-performance computing electronic equipment. The cooling liquid of the present application also has the advantages of low cost and environmental protection. Therefore, the cooling liquid of the present application is significantly superior to the cooling liquid using a Fischer-Tropsch synthetic oil, a dimethyl silicone oil, a natural ester, a synthetic ester oil or a traditional mineral base oil as a base oil in terms of cooling and heat dissipation performance, insulation performance, environmental protection and the like, and is superior to the cooling liquid composed of an electronic fluorinated liquid or a synthetic ester oil with high cost in terms of cost, and is superior to the cooling liquid composed of a synthetic ester oil or a traditional mineral base oil in terms of stability.

[0024] It can be understood that the molecular weight distribution is characterized by a polymer dispersity index (PDI), and the calculation formula is: the molecular weight distribution is equal to the ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) (PDI=Mw / Mn).

[0025] The kind of the additive is not particularly limited in the present application. For example, an additive that is advantageous for further improving the cooling and heat dissipation performance of the coolant, improving safety, prolonging the service life, improving the use convenience, and the like can be used.

[0026] The coolant of the present application has low viscosity, small density, large specific heat capacity and thermal conductivity, and excellent cooling and heat dissipation performance, and can be used for cooling and heat dissipation of equipment by immersion liquid cooling technology, which is advantageous for safe and stable operation of the equipment. The coolant also has a high open flash point and ignition point, low volatility, high safety, and good stability during long-term use. The coolant has few components, low cost, and good environmental protection, and meets the development concept of green, energy saving and environmental protection.

[0027] In some embodiments, the liquid polyethylene has an open flash point greater than 155℃ and an ignition point greater than 180℃, which is advantageous for reducing the viscosity of the coolant, improving the flowability of the coolant, and thus improving the cooling and heat dissipation performance. At the same time, it is advantageous for improving the open flash point and ignition point of the coolant, and ensuring the safety of the coolant.

[0028] In some embodiments, the liquid polyethylene has an acid value less than 0.01 mgKOH / g, an oxidation stability (rotary oxygen bomb, 140℃) greater than 600 min, and a foam property (foam tendency / foam stability) less than 10 mL / mL, which is advantageous for improving the oxidation stability of the coolant. The test methods for the acid value, oxidation stability (rotary oxygen bomb, 140℃), and foam property (foam tendency / foam stability) are described in the examples section below, and will not be repeated here.

[0029] In some embodiments, the liquid polyethylene does not contain aromatic hydrocarbons, and has an ultraviolet absorbance less than 0.01 at 260nm-420nm. Therefore, the coolant meets the GB1886.215-2016 standard "Food Additive White Oil" index requirements, is harmless to the operator, and meets the development concept of green, energy saving and environmental protection.

[0030] In the prior art, polyethylene is mostly prepared by using ethylene as a raw material, obtaining 1-decene by ethylene oligomerization in the first step, and obtaining poly-alpha olefin (PAO) base oil by polymerization-hydrogenation-fractionation cutting in the second step, with a yield of about 40%. The coolant prepared from poly-alpha olefin (PAO) base oil has poorer performance than the coolant of the present application.

[0031] The liquid polyethylene used in the present application is prepared by using ethylene as a raw material and using a nickel-based olefin polymerization catalyst system for polymerization.

[0032] The liquid polyethylene has the advantages of narrow molecular weight distribution, low viscosity, low density, high flash point and ignition point, large specific heat capacity and thermal conductivity, which is beneficial to improve the cooling performance, safety and service life of the cooling liquid.

[0033] The content of the liquid polyethylene as the base oil in the cooling liquid has an important influence on the cooling performance, safety and service life of the cooling liquid. In some embodiments, the mass percentage content of the liquid polyethylene in the cooling liquid is 99.491%-99.7988%, which is beneficial to ensure the excellent cooling performance, high safety and long-term use stability of the cooling liquid.

[0034] The additives can make the performance of the cooling liquid more perfect, and the use of suitable types of additives is beneficial to simplify the composition of the cooling liquid, save costs, and at the same time, take into account the better cooling performance. In some embodiments, the additives include at least one of an antioxidant, an oil-soluble metal deactivator and an antifoaming agent, the antioxidant is beneficial to improve the antioxidant performance of the cooling liquid, the oil-soluble metal deactivator is beneficial to form a protective film on the surface of the cooled equipment to prevent corrosion of the equipment, and the antifoaming agent can prevent the cooling liquid from generating foam during operation, avoiding affecting the normal operation of heat transfer, insulation and circulating pump. Further, the additives preferably include an antioxidant, an oil-soluble metal deactivator and an antifoaming agent, the antioxidant and the oil-soluble metal deactivator have better antioxidant effect, and the combination of the three additives is beneficial to optimize the performance of the cooling liquid at a lower cost.

[0035] Further, the antioxidant can include a hindered phenolic antioxidant, for example, including a monophenol type antioxidant, specifically including 2,6-di-tert-butyl-p-cresol and / or 2,6-di-tert-butyl phenol, preferably 2,6-di-tert-butyl-p-cresol, which makes the antioxidant performance of the cooling liquid better; the oil-soluble metal deactivator includes at least one of a benzotriazole type (benzotriazole derivative metal deactivator), a methyl benzotriazole type (methyl benzotriazole derivative metal deactivator) and a 1,2,3-triazole type (1,2,3-triazole derivative metal deactivator), and the oil-soluble metal deactivator preferably is a methyl benzotriazole derivative metal deactivator, which makes the corrosion resistance of the cooling liquid better.

[0036] The antifoaming agent can include at least one of a silicone type antifoaming agent and a polyether type antifoaming agent, wherein the silicone type antifoaming agent can include a dimethyl silicone oil type antifoaming agent, which makes the antifoaming performance of the cooling liquid better.

[0037] Further, the mass percentage of the antioxidant in the coolant can be 0.2%-0.5%, preferably 0.3%-0.5%, which is beneficial to the cost and better antioxidant effect; the mass percentage of the oil-soluble metal deactivator in the coolant can be 0.001%-0.008%, preferably 0.002%-0.005%, which is beneficial to the cost and better antioxidant and corrosion resistance effect; the mass percentage of the antifoam agent in the coolant can be 0.0001%-0.001%, preferably 0.0002%-0.001%, further preferably 0.0003%-0.0005%, which is beneficial to the cost and better antifoam effect.

[0038] The second aspect of the present application provides a preparation method of the coolant of the first aspect, comprising the following steps: adding the additives into a raw material system comprising the liquid polyethylene, and mixing to obtain the coolant.

[0039] The present application does not particularly limit the mixing conditions, and suitable mixing conditions can be selected according to the types of the additives to ensure the mixing effect of the materials. For example, the liquid polyethylene can be preheated to improve the flowability and solubility, so as to improve the mixing effect of the additives and the liquid polyethylene.

[0040] The preparation method is simple in operation and easy to be popularized in industry, and the coolant with better cooling and heat dissipation performance can be obtained by the preparation method.

[0041] Specifically, when the additives comprise the antioxidant, the oil-soluble metal deactivator and the antifoam agent, in order to ensure the performance and quality of the coolant, the preparation method of the coolant can comprise the following processes, comprising the following steps:

[0042] 1) adding the antioxidant and the oil-soluble metal deactivator into part of the liquid polyethylene to obtain a first mother liquor;

[0043] 2) adding the antifoam agent into part of the liquid polyethylene to perform grinding treatment to obtain a second mother liquor;

[0044] 3) mixing the first mother liquor, the second mother liquor and the remaining liquid polyethylene to obtain the coolant.

[0045] In order to ensure the mixing effect of the antioxidant, the oil-soluble metal deactivator and the liquid polyethylene, part of the polyethylene can be preheated to a certain temperature, for example 80°C, and then the antioxidant and the oil-soluble metal deactivator are added, and the mixing system is stirred for a certain time, for example 30 min, to obtain the first mother liquor.

[0046] In order to better mix the antifoaming agent and the liquid polyethylene in step 2), the mixing system can be ground for 10 minutes to obtain a second mother liquor. The present application does not limit the manner of the grinding treatment, for example, a colloidal mill can be used for the circulation grinding treatment.

[0047] In step 3), after the first mother liquor, the second mother liquor and the remaining liquid polyethylene are mixed, stirring can be performed for 30 minutes and then standing for 1 hour, which is beneficial to improve the performance of the cooling liquid.

[0048] The liquid polyethylene described above can be purchased from Nanjing Zhongke Kangrun New Material Technology Co., Ltd.

[0049] The third aspect of the present application provides a cooling composition, wherein the cooling composition comprises the cooling liquid of the first aspect or the cooling liquid obtained by the preparation method of the second aspect.

[0050] The cooling composition described above also has the advantages of low viscosity, low density, high flash point and ignition point, high specific heat capacity and thermal conductivity, good cooling and heat dissipation performance, and the like due to the inclusion of the cooling liquid of the present application. Further, in order to expand the application field of the cooling composition, it can be modified based on actual needs, for example, some other components that can improve the flowability, ignition point, corrosion resistance, durability and the like of the cooling composition can be added, and the present application does not limit the specific types and addition amounts of the other components, which can be determined according to actual application.

[0051] Hereinafter, the cooling liquid and the preparation method thereof of the present application will be described in more detail through specific examples.

[0052] Example 1

[0053] The present example provides a cooling liquid, which comprises, in terms of mass percentage, 0.3% of an antioxidant, 0.005% of an oil-soluble metal deactivator, 0.0005% of an antifoaming agent, and the balance of liquid polyethylene; wherein the antioxidant is a 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a methylbenzotriazole derivative metal deactivator, and the antifoaming agent is a dimethyl silicone oil type antifoaming agent.

[0054] The present example also provides a preparation method of the cooling liquid described above, comprising the following steps:

[0055] 1) Liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. is used, and the properties of the liquid polyethylene are shown in Table 2 as liquid-1, the number average molecular weight of the liquid polyethylene is 183 g / mol, the molecular weight distribution is 1.68, the open flash point is 160°C, and the ignition point is 182°C;

[0056] 2) Take 1 kg of liquid polyethylene heated to 80℃, then add 150g 2,6-di-tert-butyl-p-cresol antioxidant and 2.5g of a methyl benzotriazole derivative metal deactivator to the above liquid polyethylene to obtain a first mother liquor;

[0057] 3) Add 0.25g of silicone type antifoam agent to 1kg of liquid polyethylene and use a colloid mill to cycle grind for 10min to obtain a second mother liquor;

[0058] 4) Mix the first mother liquor, the second mother liquor and 47.84725kg of liquid polyethylene, stir for 30min and then stand for 1h to obtain the above cooling liquid.

[0059] Example 2

[0060] The present embodiment provides a cooling liquid, which comprises, in terms of mass percentage, 0.3% of an antioxidant, 0.005% of an oil-soluble metal deactivator, 0.0005% of an antifoam agent, and the balance being liquid polyethylene; wherein the antioxidant is a 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a methyl benzotriazole derivative metal deactivator, and the antifoam agent is a dimethyl silicone oil type antifoam agent.

[0061] The present embodiment also provides a preparation method of the above cooling liquid, comprising the following steps:

[0062] 1) Use liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd., the properties of which are shown in Table 2, liquid-2, the number average molecular weight of the liquid polyethylene is 184g / mol, the molecular weight distribution is 1.62, the open flash point is 163℃, and the ignition point is 185℃;

[0063] 2) Take 1 kg of liquid polyethylene heated to 80℃, then add 150g 2,6-di-tert-butyl-p-cresol antioxidant and 2.5g of a methyl benzotriazole derivative metal deactivator to the above liquid polyethylene to obtain a first mother liquor;

[0064] 3) Add 0.25g of silicone type antifoam agent to 1kg of liquid polyethylene and use a colloid mill to cycle grind for 10min to obtain a second mother liquor;

[0065] 4) Mix the first mother liquor, the second mother liquor and 47.84725kg of liquid polyethylene, stir for 30min and then stand for 1h to obtain the above cooling liquid.

[0066] Example 3

[0067] The embodiment provides a cooling liquid, which comprises 0.3% of an antioxidant, 0.005% of an oil-soluble metal deactivator, 0.0005% of an antifoaming agent and the balance of liquid polyethylene according to mass percentage; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a methylbenzotriazole derivative metal deactivator, and the antifoaming agent is a dimethyl silicone oil type antifoaming agent.

[0068] The embodiment also provides a preparation method of the cooling liquid, which comprises the following steps:

[0069] 1) liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. is used, and the properties are shown as liquid-3 in Table 2, the number average molecular weight of the liquid polyethylene is 180 g / mol, the molecular weight distribution is 1.62, the open flash point is 162 DEG C, and the ignition point is 184 DEG C;

[0070] 2) 1 kg of the liquid polyethylene is weighed and heated to 80 DEG C, then 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of a methylbenzotriazole derivative metal deactivator are added into the liquid polyethylene to obtain a first mother liquor;

[0071] 3) 0.25 g of a dimethyl silicone oil type antifoaming agent is added into 1 kg of the liquid polyethylene, and the mixture is circularly ground for 10 min by using a colloid mill to obtain a second mother liquor;

[0072] 4) the first mother liquor, the second mother liquor and 47.84725 kg of the liquid polyethylene are mixed, stirred for 30 min and then statically placed for 1 h to obtain the cooling liquid.

[0073] Embodiment 4

[0074] The embodiment provides a cooling liquid, which comprises 0.3% of an antioxidant, 0.005% of an oil-soluble metal deactivator, 0.0005% of an antifoaming agent and the balance of liquid polyethylene according to mass percentage; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a 1,2,4-triazole derivative metal deactivator, and the antifoaming agent is an organic silicon type antifoaming agent.

[0075] The embodiment also provides a preparation method of the cooling liquid, which comprises the following steps:

[0076] 1) liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. is used, and the properties are shown as liquid-1 in Table 2, the number average molecular weight of the liquid polyethylene is 183 g / mol, the molecular weight distribution is 1.68, the open flash point is 160 DEG C, and the ignition point is 182 DEG C;

[0077] 2) take 1 kg of liquid polyethylene heated to 80℃, then add 150g 2,6-di-tert-butyl-p-cresol antioxidant and 2.5g 1,2,4-triazole derivative metal deactivator to the above liquid polyethylene to obtain a first mother liquor;

[0078] 3) add 0.25g dimethyl silicone oil type antifoam agent to 1kg of liquid polyethylene, and use a colloid mill to cycle grind for 10min to obtain a second mother liquor;

[0079] 4) mix the first mother liquor, the second mother liquor and 47.84725kg of liquid polyethylene, stir for 30min and then stand for 1h to obtain the above cooling liquid.

[0080] Example 5

[0081] The embodiment provides a cooling liquid, which comprises, in terms of mass percentage, 0.3% of an antioxidant, 0.005% of an oil-soluble metal deactivator, 0.0005% of an antifoam agent, and the balance of liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a benzotriazole derivative metal deactivator, and the antifoam agent is a silicone type antifoam agent.

[0082] The embodiment also provides a preparation method of the cooling liquid, comprising the following steps:

[0083] 1) adopt liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd., the properties of which are shown in Table 2 as liquid-1, the number average molecular weight of the liquid polyethylene is 183g / mol, the molecular weight distribution is 1.68, the open flash point is 160℃, and the ignition point is 182℃;

[0084] 2) take 1 kg of liquid polyethylene heated to 80℃, then add 150g 2,6-di-tert-butyl-p-cresol antioxidant and 2.5g benzotriazole derivative metal deactivator to the above liquid polyethylene to obtain a first mother liquor;

[0085] 3) add 0.25g dimethyl silicone oil type antifoam agent to 1kg of liquid polyethylene, and use a colloid mill to cycle grind for 10min to obtain a second mother liquor;

[0086] 4) mix the first mother liquor, the second mother liquor and 47.84725kg of liquid polyethylene, stir for 30min and then stand for 1h to obtain the above cooling liquid.

[0087] Example 6

[0088] The embodiment provides a cooling liquid, which comprises 0.3% of an antioxidant, 0.005% of an oil-soluble metal deactivator, 0.0005% of an antifoaming agent and the balance of liquid polyethylene according to mass percentage; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a methylbenzotriazole derivative metal deactivator, and the antifoaming agent is a polyether type antifoaming agent.

[0089] The embodiment also provides a preparation method of the cooling liquid, which comprises the following steps:

[0090] 1) liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. is used, and the properties are shown as liquid-1 in Table 2, the number average molecular weight of the liquid polyethylene is 183 g / mol, the molecular weight distribution is 1.68, the open flash point is 160 DEG C, and the ignition point is 182 DEG C;

[0091] 2) 1 kg of the liquid polyethylene is heated to 80 DEG C, then 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of a methylbenzotriazole derivative metal deactivator are added into the liquid polyethylene to obtain a first mother liquor;

[0092] 3) 0.25 g of a polyether type antifoaming agent is added into 1 kg of the liquid polyethylene, and the mixture is circularly ground for 10 min by using a colloid mill to obtain a second mother liquor;

[0093] 4) the first mother liquor, the second mother liquor and 47.84725 kg of the liquid polyethylene are mixed, stirred for 30 min and then statically placed for 1 h to obtain the cooling liquid.

[0094] Embodiment 7

[0095] The embodiment provides a cooling liquid, which comprises 0.3% of an antioxidant, 0.005% of an oil-soluble metal deactivator, 0.0005% of an antifoaming agent and the balance of liquid polyethylene according to mass percentage; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a methylbenzotriazole derivative metal deactivator, and the antifoaming agent is a polyether type antifoaming agent.

[0096] The embodiment also provides a preparation method of the cooling liquid, which comprises the following steps:

[0097] 1) liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. is used, and the properties are shown as liquid-1 in Table 2, the number average molecular weight of the liquid polyethylene is 183 g / mol, the molecular weight distribution is 1.68, the open flash point is 160 DEG C, and the ignition point is 182 DEG C;

[0098] 2) Take 1 kg of liquid polyethylene and heat it to 80℃, then add 150g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5g of methyl benzotriazole derivative metal deactivator to the above-mentioned liquid polyethylene to obtain a first mother liquor;

[0099] 3) Add 0.25g of silicone type antifoam agent to 1kg of liquid polyethylene and use a colloid mill to circulate and grind for 10min to obtain a second mother liquor;

[0100] 4) Mix the first mother liquor, the second mother liquor and 47.84725kg of liquid polyethylene, stir for 30min and then stand for 1h to obtain the above-mentioned cooling liquid.

[0101] Example 8

[0102] The embodiment provides a cooling liquid, which comprises, in terms of mass percentage, 0.5% of an antioxidant, 0.005% of an oil-soluble metal deactivator, 0.0005% of an antifoam agent, and the balance of liquid polyethylene; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a methyl benzotriazole derivative metal deactivator, and the antifoam agent is a dimethyl silicone oil type antifoam agent.

[0103] The embodiment also provides a preparation method of the cooling liquid, which comprises the following steps:

[0104] 1) Use liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd., the properties of which are shown in Table 2 as liquid-1, the number average molecular weight of the liquid polyethylene is 187g / mol, the molecular weight distribution is 1.61, and the open flash point is 152℃.

[0105] 2) Take 1 kg of liquid polyethylene and heat it to 80℃, then add 150g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5g of methyl benzotriazole derivative metal deactivator to the above-mentioned liquid polyethylene to obtain a first mother liquor;

[0106] 3) Add 0.25g of silicone type antifoam agent to 1kg of liquid polyethylene and use a colloid mill to circulate and grind for 10min to obtain a second mother liquor;

[0107] 4) Mix the first mother liquor, the second mother liquor and 47.74725kg of liquid polyethylene, stir for 30min and then stand for 1h to obtain the above-mentioned cooling liquid.

[0108] Example 9

[0109] The embodiment provides a cooling liquid, which comprises 0.3% of an antioxidant, 0.002% of an oil-soluble metal deactivator, 0.0005% of an antifoaming agent and the balance of liquid polyethylene according to mass percentage; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a methylbenzotriazole derivative metal deactivator, and the antifoaming agent is a dimethyl silicone oil type antifoaming agent.

[0110] The embodiment also provides a preparation method of the cooling liquid, which comprises the following steps:

[0111] 1) liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. is used, and the properties are shown as liquid-1 in Table 2, the number average molecular weight of the liquid polyethylene is 183 g / mol, the molecular weight distribution is 1.68, the open flash point is 160 DEG C, and the ignition point is 182 DEG C;

[0112] 2) 150g of 2,6-di-tert-butyl-p-cresol antioxidant and 1g of a methylbenzotriazole derivative metal deactivator are added into 1kg of the liquid polyethylene heated to 80 DEG C to obtain a first mother liquor;

[0113] 3) 0.25g of an organic silicon type antifoaming agent is added into 1kg of the liquid polyethylene, and the mixture is circularly ground for 10min by using a colloid mill to obtain a second mother liquor;

[0114] 4) the first mother liquor, the second mother liquor and 47.84975kg of the liquid polyethylene are mixed, stirred for 30min and then statically placed for 1h to obtain the cooling liquid.

[0115] Embodiment 10

[0116] The embodiment provides a cooling liquid, which comprises 0.3% of an antioxidant, 0.005% of an oil-soluble metal deactivator, 0.0003% of an antifoaming agent and the balance of liquid polyethylene according to mass percentage; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a methylbenzotriazole derivative metal deactivator, and the antifoaming agent is a dimethyl silicone oil type antifoaming agent.

[0117] The embodiment also provides a preparation method of the cooling liquid, which comprises the following steps:

[0118] 1) liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. is used, and the properties are shown as liquid-1 in Table 2, the number average molecular weight of the liquid polyethylene is 183 g / mol, the molecular weight distribution is 1.68, the open flash point is 160 DEG C, and the ignition point is 182 DEG C;

[0119] 2) take 1 kg of liquid polyethylene heated to 80℃, then add 150g 2,6-di-tert-butyl-p-cresol antioxidant and 2.5g of a methyl benzotriazole derivative metal deactivator to the above liquid polyethylene to obtain a first mother liquor;

[0120] 3) add 0.15g of silicone type antifoam to 1kg of liquid polyethylene and use a colloid mill to cycle grind for 10min to obtain a second mother liquor;

[0121] 4) mix the first mother liquor, the second mother liquor and 47.84735kg of liquid polyethylene, stir for 30min and then stand for 1h to obtain the above cooling liquid.

[0122] Example 11

[0123] The example provides a cooling liquid, which comprises, in terms of mass percentage, 0.3% of an antioxidant, 0.005% of an oil-soluble metal deactivator, 0.0005% of an antifoam, and the balance being liquid polyethylene; wherein the antioxidant is a 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a methyl benzotriazole derivative metal deactivator, and the antifoam is a dimethyl silicone oil type antifoam.

[0124] The example also provides a preparation method of the above cooling liquid, comprising the following steps:

[0125] 1) use liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd., the properties of which are shown in Table 2, liquid-4, the number average molecular weight of the liquid polyethylene is 185g / mol, the molecular weight distribution is 1.61, the open flash point is 170℃, and the ignition point is 187℃;

[0126] 2) take 1 kg of liquid polyethylene heated to 80℃, then add 150g 2,6-di-tert-butyl-p-cresol antioxidant and 2.5g of a methyl benzotriazole derivative metal deactivator to the above liquid polyethylene to obtain a first mother liquor;

[0127] 3) add 0.25g of silicone type antifoam to 1kg of liquid polyethylene and use a colloid mill to cycle grind for 10min to obtain a second mother liquor;

[0128] 4) mix the first mother liquor, the second mother liquor and 47.84725kg of liquid polyethylene, stir for 30min and then stand for 1h to obtain the above cooling liquid.

[0129] Example 12

[0130] The embodiment provides a cooling liquid, which comprises 0.3% of an antioxidant, 0.005% of an oil-soluble metal deactivator, 0.0005% of an antifoaming agent and the balance of liquid polyethylene according to mass percentage; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a methylbenzotriazole derivative metal deactivator, and the antifoaming agent is a dimethyl silicone oil type antifoaming agent.

[0131] The embodiment also provides a preparation method of the cooling liquid, which comprises the following steps:

[0132] 1) liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. is used, and the properties are shown in liquid-5 in Table 2, the number average molecular weight of the liquid polyethylene is 185 g / mol, the molecular weight distribution is 1.69, the open flash point is 1560 DEG C, and the ignition point is 180 DEG C;

[0133] 2) 1 kg of the liquid polyethylene is heated to 80 DEG C, then 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of a methylbenzotriazole derivative metal deactivator are added into the liquid polyethylene to obtain a first mother liquor;

[0134] 3) 0.25 g of an organic silicon type antifoaming agent is added into 1 kg of the liquid polyethylene, and the mixture is circularly ground for 10 min by using a colloid mill to obtain a second mother liquor;

[0135] 4) the first mother liquor, the second mother liquor and 47.84725 kg of the liquid polyethylene are mixed, stirred for 30 min and then statically placed for 1 h to obtain the cooling liquid.

[0136] Embodiment 13

[0137] The embodiment provides a cooling liquid, which comprises 0.2% of an antioxidant, 0.005% of an oil-soluble metal deactivator, 0.0005% of an antifoaming agent and the balance of liquid polyethylene according to mass percentage; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a methylbenzotriazole derivative metal deactivator, and the antifoaming agent is a dimethyl silicone oil type antifoaming agent.

[0138] The embodiment also provides a preparation method of the cooling liquid, which comprises the following steps:

[0139] 1) liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. is used, and the properties are shown in liquid-1 in Table 2, the number average molecular weight of the liquid polyethylene is 183 g / mol, the molecular weight distribution is 1.68, the open flash point is 160 DEG C, and the ignition point is 182 DEG C;

[0140] 2) take 1 kg of liquid polyethylene heated to 80℃, then add 100g 2,6-di-tert-butyl-p-cresol antioxidant and 2.5g of a methyl benzotriazole derivative metal deactivator to the above liquid polyethylene to obtain a first mother liquor;

[0141] 3) add 0.25g of silicone type antifoam agent to 1kg of liquid polyethylene and use a colloid mill to cycle grind for 10min to obtain a second mother liquor;

[0142] 4) mix the first mother liquor, the second mother liquor and 47.89725kg of liquid polyethylene, stir for 30min and then stand for 1h to obtain the above cooling liquid.

[0143] Example 14

[0144] The present embodiment provides a cooling liquid, which comprises, in terms of mass percentage, 0.3% of an antioxidant, 0.001% of an oil-soluble metal deactivator, 0.0005% of an antifoam agent, and the balance being liquid polyethylene; wherein the antioxidant is a 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a methyl benzotriazole derivative metal deactivator, and the antifoam agent is a dimethyl silicone oil type antifoam agent.

[0145] The present embodiment also provides a preparation method of the above cooling liquid, comprising the following steps:

[0146] 1) use liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd., properties as liquid-1 in Table 2, the number average molecular weight of the liquid polyethylene is 183g / mol, the molecular weight distribution is 1.68, the open flash point is 160℃, and the ignition point is 182℃;

[0147] 2) take 1 kg of liquid polyethylene heated to 80℃, then add 150g 2,6-di-tert-butyl-p-cresol antioxidant and 0.5g of a methyl benzotriazole derivative metal deactivator to the above liquid polyethylene to obtain a first mother liquor;

[0148] 3) add 0.25g of silicone type antifoam agent to 1kg of liquid polyethylene and use a colloid mill to cycle grind for 10min to obtain a second mother liquor;

[0149] 4) mix the first mother liquor, the second mother liquor and 47.84925kg of liquid polyethylene, stir for 30min and then stand for 1h to obtain the above cooling liquid.

[0150] Example 15

[0151] The embodiment provides a cooling liquid, which comprises 0.3% of an antioxidant, 0.008% of an oil-soluble metal deactivator, 0.0005% of an antifoaming agent and the balance of liquid polyethylene according to mass percentage; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a methylbenzotriazole derivative metal deactivator, and the antifoaming agent is a dimethyl silicone oil type antifoaming agent.

[0152] The embodiment also provides a preparation method of the cooling liquid, which comprises the following steps:

[0153] 1) liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. is used, and the properties are shown as liquid-1 in Table 2, the number average molecular weight of the liquid polyethylene is 183 g / mol, the molecular weight distribution is 1.68, the open flash point is 160 DEG C, and the ignition point is 182 DEG C;

[0154] 2) 1 kg of the liquid polyethylene is heated to 80 DEG C, then 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 4 g of a methylbenzotriazole derivative metal deactivator are added into the liquid polyethylene to obtain a first mother liquor;

[0155] 3) 0.25 g of an organic silicon type antifoaming agent is added into 1 kg of the liquid polyethylene, and the mixture is circularly ground for 10 min by using a colloid mill to obtain a second mother liquor;

[0156] 4) the first mother liquor, the second mother liquor and 47.84575 kg of the liquid polyethylene are mixed, stirred for 30 min and then statically placed for 1 h to obtain the cooling liquid.

[0157] Embodiment 16

[0158] The embodiment provides a cooling liquid, which comprises 0.3% of an antioxidant, 0.005% of an oil-soluble metal deactivator, 0.0002% of an antifoaming agent and the balance of liquid polyethylene according to mass percentage; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a methylbenzotriazole derivative metal deactivator, and the antifoaming agent is a dimethyl silicone oil type antifoaming agent.

[0159] The embodiment also provides a preparation method of the cooling liquid, which comprises the following steps:

[0160] 1) liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. is used, and the properties are shown as liquid-1 in Table 2, the number average molecular weight of the liquid polyethylene is 183 g / mol, the molecular weight distribution is 1.68, the open flash point is 160 DEG C, and the ignition point is 182 DEG C;

[0161] 2) take 1 kg of liquid polyethylene heated to 80℃, then add 150g 2,6-di-tert-butyl-p-cresol antioxidant and 2.5g of a methyl benzotriazole derivative metal deactivator to the above liquid polyethylene to obtain a first mother liquor;

[0162] 3) add 0.1g of silicone type antifoam agent to 1kg of liquid polyethylene and use a colloid mill to cycle grind for 10min to obtain a second mother liquor;

[0163] 4) mix the first mother liquor, the second mother liquor and 47.8474kg of liquid polyethylene, stir for 30min and then stand for 1h to obtain the above cooling liquid.

[0164] Example 17

[0165] The present embodiment provides a cooling liquid, which comprises, in terms of mass percentage, 0.1% of an antioxidant, 0.005% of an oil-soluble metal deactivator, 0.0005% of an antifoam agent, and the balance being liquid polyethylene; wherein the antioxidant is a 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a methyl benzotriazole derivative metal deactivator, and the antifoam agent is a dimethyl silicone oil type antifoam agent.

[0166] The present embodiment also provides a preparation method of the above cooling liquid, comprising the following steps:

[0167] 1) use liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd., the properties of which are shown in Table 2 as liquid-1, the number average molecular weight of the liquid polyethylene is 183g / mol, the molecular weight distribution is 1.68, the open flash point is 160℃, and the ignition point is 182℃;

[0168] 2) take 1 kg of liquid polyethylene heated to 80℃, then add 50g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5g of methyl benzotriazole derivative metal deactivator to the above liquid polyethylene to obtain a first mother liquor;

[0169] 3) add 0.25g of silicone type antifoam agent to 1kg of liquid polyethylene and use a colloid mill to cycle grind for 10min to obtain a second mother liquor;

[0170] 4) mix the first mother liquor, the second mother liquor and 47.85725kg of liquid polyethylene, stir for 30min and then stand for 1h to obtain the above cooling liquid.

[0171] Example 18

[0172] The embodiment provides a cooling liquid, which comprises 0.3% of an antioxidant, 0.0005% of an oil-soluble metal deactivator, 0.0005% of an antifoaming agent and the balance of liquid polyethylene according to mass percentage; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a methylbenzotriazole derivative metal deactivator, and the antifoaming agent is a dimethyl silicone oil type antifoaming agent.

[0173] The embodiment also provides a preparation method of the cooling liquid, which comprises the following steps:

[0174] 1) liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. is used, and the properties are shown as liquid-1 in Table 2, the number average molecular weight of the liquid polyethylene is 183 g / mol, the molecular weight distribution is 1.68, the open flash point is 160 DEG C, and the ignition point is 182 DEG C;

[0175] 2) 1 kg of the liquid polyethylene is weighed and heated to 80 DEG C, then 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 0.25 g of a methylbenzotriazole derivative metal deactivator are added into the liquid polyethylene to obtain a first mother liquor;

[0176] 3) 0.25 g of an organic silicon type antifoaming agent is added into 1 kg of the liquid polyethylene, and the mixture is circularly ground for 10 min by using a colloid mill to obtain a second mother liquor;

[0177] 4) the first mother liquor, the second mother liquor and 47.8495 kg of the liquid polyethylene are mixed, stirred for 30 min and then statically placed for 1 h to obtain the cooling liquid.

[0178] Embodiment 19

[0179] The embodiment provides a cooling liquid, which comprises 0.3% of an antioxidant, 0.009% of an oil-soluble metal deactivator, 0.0005% of an antifoaming agent and the balance of liquid polyethylene according to mass percentage; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a methylbenzotriazole derivative metal deactivator, and the antifoaming agent is a dimethyl silicone oil type antifoaming agent.

[0180] The embodiment also provides a preparation method of the cooling liquid, which comprises the following steps:

[0181] 1) liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. is used, and the properties are shown as liquid-1 in Table 2, the number average molecular weight of the liquid polyethylene is 183 g / mol, the molecular weight distribution is 1.68, the open flash point is 160 DEG C, and the ignition point is 182 DEG C;

[0182] 2) take 1 kg of liquid polyethylene heated to 80℃, then add 150g 2,6-di-tert-butyl-p-cresol antioxidant and 4.5g of a methyl benzotriazole derivative metal deactivator to the above liquid polyethylene to obtain a first mother liquor;

[0183] 3) add 0.25g of silicone type antifoam agent to 1kg of liquid polyethylene and use a colloid mill to cycle grind for 10min to obtain a second mother liquor;

[0184] 4) mix the first mother liquor, the second mother liquor and 47.84525kg of liquid polyethylene, stir for 30min and then stand for 1h to obtain the above cooling liquid.

[0185] Example 20

[0186] The present embodiment provides a cooling liquid, which comprises, in terms of mass percentage, 0.3% of an antioxidant, 0.005% of an oil-soluble metal deactivator, 0.0001% of an antifoam agent, and the balance being liquid polyethylene; wherein the antioxidant is a 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a methyl benzotriazole derivative metal deactivator, and the antifoam agent is a dimethyl silicone oil type antifoam agent.

[0187] The present embodiment also provides a preparation method of the above cooling liquid, comprising the following steps:

[0188] 1) use liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd., properties as liquid-1 in Table 2, the number average molecular weight of the liquid polyethylene is 183g / mol, the molecular weight distribution is 1.68, the open flash point is 160℃, and the ignition point is 182℃;

[0189] 2) take 1 kg of liquid polyethylene heated to 80℃, then add 150g 2,6-di-tert-butyl-p-cresol antioxidant and 2.5g of a methyl benzotriazole derivative metal deactivator to the above liquid polyethylene to obtain a first mother liquor;

[0190] 3) add 0.05g of silicone type antifoam agent to 1kg of liquid polyethylene and use a colloid mill to cycle grind for 10min to obtain a second mother liquor;

[0191] 4) mix the first mother liquor and 47.84745kg of liquid polyethylene, stir for 30min and then stand for 1h to obtain the above cooling liquid.

[0192] Comparative Example 1

[0193] The comparative example provides a cooling liquid, which comprises an antioxidant 0.3%, an oil-soluble metal deactivator 0.005%, an antifoaming agent 0.0005%, and the balance is liquid polyethylene according to the mass percentage; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a methyl benzotriazole derivative metal deactivator, and the antifoaming agent is a dimethyl silicone oil type antifoaming agent.

[0194] The comparative example also provides a preparation method of the above cooling liquid, comprising the following steps:

[0195] 1) The liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. is used, and the properties are shown as liquid-6 in Table 2. The number average molecular weight of the liquid polyethylene is 185 g / mol, the molecular weight distribution is 1.75, and the open flash point is 152°C.

[0196] 2) After 1 kg of the liquid polyethylene is heated to 80°C, 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of a methyl benzotriazole derivative metal deactivator are added to the above liquid polyethylene to obtain a first mother liquor;

[0197] 3) 0.25 g of an organic silicon type antifoaming agent is added to 1 kg of the liquid polyethylene, and a colloid mill is used for circular grinding for 10 min to obtain a second mother liquor;

[0198] 4) The first mother liquor, the second mother liquor, and 47.84725 kg of the liquid polyethylene are mixed, stirred for 30 min, and then statically placed for 1 h to obtain the above cooling liquid.

[0199] Comparative Example 2

[0200] The comparative example provides a cooling liquid, which comprises an antioxidant 0.3%, an oil-soluble metal deactivator 0.005%, an antifoaming agent 0.0005%, and the balance is liquid polyethylene according to the mass percentage; wherein the antioxidant is 2,6-di-tert-butyl-p-cresol antioxidant, the oil-soluble metal deactivator is a methyl benzotriazole derivative metal deactivator, and the antifoaming agent is a dimethyl silicone oil type antifoaming agent.

[0201] The comparative example also provides a preparation method of the above cooling liquid, comprising the following steps:

[0202] 1) The liquid polyethylene produced by Nanjing Zhongke Kangrun New Material Technology Co., Ltd. is used, and the properties are shown as liquid-7 in Table 2. The number average molecular weight of the liquid polyethylene is 190 g / mol, the molecular weight distribution is 1.63, and the open flash point is 172°C.

[0203] 2) After 1 kg of the liquid polyethylene is heated to 80°C, 150 g of 2,6-di-tert-butyl-p-cresol antioxidant and 2.5 g of a methyl benzotriazole derivative metal deactivator are added to the above liquid polyethylene to obtain a first mother liquor;

[0204] 3) 0.25 g silicone antifoam agent was added into 1 kg liquid polyethylene, and the mixture was circulated and ground for 10 min by using a colloid mill to obtain a second mother liquor;

[0205] 4) The first mother liquor, the second mother liquor and 47.84725 kg liquid polyethylene were mixed, stirred for 30 min and then allowed to stand for 1 h to obtain the above cooling liquid.

[0206] The raw materials and the prepared cooling liquids in the above examples and comparative examples were detected with the following parameters, the detection parameters and detection methods are shown in Table 1, the raw material properties are shown in Table 2, the cooling liquid detection results are shown in Table 3 and Table 4.

[0207] Table 1

[0208] Table 2

[0209] Table 3

[0210] Table 4

[0211] Data analysis:

[0212] In Examples 1-10, the mass percentage of liquid polyethylene with a number average molecular weight of 180-185 g / mol and a molecular weight distribution of 1.60-1.70 was 99.491-99.7988%, the antioxidant was 0.3-0.5%, the metal deactivator was 0.002-0.005%, and the antifoam agent was 0.0003-0.0005%. The blended cooling liquid met the index requirements of the present patent and also met the index requirements of GB1886.215-2016 standard "Food Additive White Oil".

[0213] As shown in the data of Example 12, when the molecular weight distribution of the liquid polyethylene was 1.69, the opening flash point and the burning point of the blended cooling liquid were relatively large. As shown in the data of Example 13, when the content of the antioxidant was less than 0.3% and was 0.2%, the rotary oxygen bomb value of the blended cooling liquid was relatively small. As shown in the data of Example 14, when the content of the metal deactivator was less than 0.002% and was 0.001%, the rotary oxygen bomb value of the blended cooling liquid was relatively small. As shown in the data of Example 15, when the content of the metal deactivator was higher than 0.005% and was 0.008%, the acid value of the blended cooling liquid was relatively large. As shown in the data of Example 16, when the content of the antifoam agent was less than 0.0003% and was 0.0002%, the foam property was relatively large.

[0214] As seen from Example 17, when the antioxidant content is less than 0.2% and is 0.1%, the rotating bomb value of the blended coolant is unqualified; as seen from Example 18, when the metal deactivator content is less than 0.001% and is 0.0005%, the rotating bomb value of the blended coolant is unqualified; as seen from Example 19, when the metal deactivator content is more than 0.008% and is 0.009%, the acid value of the blended coolant is unqualified; as seen from Example 20, when the antifoaming agent content is less than 0.0002% and is 0.0001%, the foaming property of the blended coolant is unqualified.

[0215] As seen from Comparative Example 1, when the molecular weight distribution of the liquid polyethylene is more than 1.70 and is 1.72, the open flash point and the burning point of the blended coolant are unqualified; as seen from Comparative Example 2, when the number average molecular weight of the liquid polyethylene is more than 185 g / mol and is 190 g / mol, the 40°C viscosity of the blended coolant is increased and is more than 6 mm 2 / s, which exceeds the requirement of the coolant.

[0216] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A coolant, characterized by, The cooling liquid comprises liquid polyethylene and additives, the number average molecular weight of the liquid polyethylene is 180-185 g / mol, and the molecular weight distribution is 1.60-1.

70.

2. The coolant according to claim 1, characterized in that, The liquid polyethylene has an open flash point greater than 155℃, a fire point greater than 180℃, an acid value less than 0.01 mgKOH / g, an oxidation stability greater than 600 min, and a foam stability less than 10 / 0 mL / mL.

3. The coolant according to claim 1 or 2, characterized in that, The liquid polyethylene has an ultraviolet absorbance at 260 nm-420 nm less than 0.

01.

4. Cooling liquid according to any one of claims 1-3, characterised in that The liquid polyethylene is prepared by a method comprising at least the following steps: Ethylene is used as raw material, and a nickel-based olefin polymerization catalyst system is used for polymerization.

5. Cooling liquid according to any one of claims 1-4, characterised in that The mass percentage content of the liquid polyethylene in the cooling liquid is 99.1%-99.8%.

6. Cooling liquid according to any one of claims 1-4, characterised in that The additives include at least one of an antioxidant, an oil-soluble metal deactivator, and an antifoaming agent.

7. The coolant of claim 6, wherein The antioxidant includes a hindered phenolic antioxidant; the hindered phenolic antioxidant includes 2,6-di-tert-butyl-p-cresol and / or 2,6-di-tert-butyl phenol; and / or, the oil-soluble metal deactivator includes a triazole metal deactivator; the triazole metal deactivator includes one or more of a methyl benzotriazole, a 1,2,3-triazole, and a benzotriazole; And / or, the antifoaming agent includes at least one of a silicone type antifoaming agent and a polyether type antifoaming agent; the silicone type antifoaming agent includes a dimethyl silicone oil type antifoaming agent.

8. The coolant of claim 6, wherein The mass percentage content of the antioxidant in the cooling liquid is 0.2%-0.5%, preferably 0.3%-0.5%; The mass percentage content of the oil-soluble metal deactivator in the cooling liquid is 0.001%-0.008%, preferably 0.002%-0.005%; The mass percentage content of the antifoaming agent in the cooling liquid is 0.0001%-0.001%, preferably 0.0003%-0.0005%.

9. A method for the preparation of the cooling liquid according to any one of claims 1 to 8, characterized in that, The method comprises the following steps: The additives are added to a raw material system comprising the liquid polyethylene, and the raw material system is mixed to obtain the cooling liquid.

10. The method of claim 9, wherein the cooling liquid is prepared by adding the additive to the base liquid. The method of adding the additives to the raw material system comprising the liquid polyethylene, and mixing to obtain the cooling liquid, specifically comprises: 1) The antioxidant and the oil-soluble metal deactivator are added to part of the liquid polyethylene to obtain a first mother liquor; 2) The antifoaming agent is added to part of the liquid polyethylene for grinding treatment to obtain a second mother liquor; 3) The first mother liquor, the second mother liquor, and the remaining liquid polyethylene are mixed to obtain the cooling liquid.

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

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