Low-temperature heat conduction oil containing oxidation inhibitor and preparation process thereof

Abstract

The invention discloses low-temperature heat conduction oil containing an oxidation inhibitor. The low-temperature heat conduction oil is prepared from the following components in percentage by weight: 95.9 to 96.1 percent of alkane base oil, 1.9 to 2.1 percent of a high-temperature antioxidant, 0.4 to 0.6 percent of an extreme pressure anti-wear agent, 0.4 to 0.6 percent of an anti-corrosion and anti-rust agent, 0.4 to 0.6 percent of a metal deactivator and 0.4 to 0.6 percent of an ash-free circulating oil composite additive, the invention relates to a preparation process of low-temperature heat-conducting oil containing an oxidation inhibitor. The preparation process comprises the following steps: S1, preparing alkane base oil; s2, adding a high-temperature antioxidant; s3, adding other functional additives; s4, performing homogenizing and stabilizing treatment; s5, filtering and impurity removal of the oil product; s6, performance detection; and S7, packaging and storing. The oxidation inhibitor is added into the alkane base oil, so that the oxidation resistance of the heat-conducting oil is improved, the reaction rate of the alkane base oil and oxygen under the high-temperature condition can be effectively reduced, the stability of an oil product is improved, the service life is prolonged, and possible harmful substances are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat transfer oil, and more specifically, particularly relates to low-temperature heat transfer oil containing oxidation inhibitors. At the same time, the present invention also relates to a preparation process of the low-temperature heat transfer oil containing oxidation inhibitors. Background Art

[0002] With the continuous development of technology, the demand for low-temperature heat transfer oil has gradually changed from a single heat transfer requirement to a comprehensive performance requirement. Especially in certain application scenarios with high precision and high safety requirements, the oxidation stability of low-temperature heat transfer oil has become increasingly important. Heat transfer oil with poor oxidation stability is prone to produce acidic substances and sediments due to oxidation reactions during use, and even safety accidents such as overheating or fire, which in turn affects the operating efficiency and safety of the equipment.

[0003] Low-temperature heat transfer oil refers to a product that has a low viscosity at extremely low temperatures, good thermal stability, large heat capacity, is conducive to heat transfer, and has good low-temperature fluidity. It can be used as the same cold and hot carrier in the heating and cooling system, and as a coolant in the ultra-low temperature range. It has the best heat transfer coefficient among cooling media, and still has excellent heat transfer performance even at a low temperature of -70°C. It is characterized by low solidification temperature, high boiling point, and good cold transfer efficiency. At the same time, it protects the metal coil in contact with it from corrosion and has very strong antioxidant ability.

[0004] Low-temperature heat transfer oil is used in the pharmaceutical industry's sandwich jacket (double-layer, triple-layer) glass reactor, high and low temperature integrated machine, low-temperature constant temperature reaction bath, fine chemical intermediate synthesis, distillation, purification, and is recommended for use in chemical experiments, chemical plants and other closed systems in cold and heat source industries; The main characteristics of low-temperature heat transfer oil include low viscosity for rapid heat transfer, good thermal and oxidation stability to extend operating life, low flow point to avoid difficulties in starting in cold weather, non-corrosive to steel, stainless steel or aluminum conduction systems, and good flow performance at low temperatures.

[0005] However, there are some problems with the existing technology: the existing low-temperature heat transfer oil is easily oxidized by reacting with oxygen during use, especially under high temperature and high pressure, to form organic acids, aldehydes, ketones and other substances. These oxidation products not only reduce the heat transfer efficiency of the heat transfer oil, but also may cause corrosion to the equipment, and in serious cases may cause safety hazards such as system failure or fire. Therefore, we propose a low-temperature heat transfer oil containing an oxidation inhibitor and a preparation process thereof. Summary of the invention

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a low-temperature heat transfer oil containing an oxidation inhibitor and a preparation process thereof. By adding an oxidation inhibitor to an alkane base oil, the oxidation resistance of the heat transfer oil is improved, and the reaction rate of the alkane base oil with oxygen under high temperature conditions can be effectively reduced, thereby improving the stability of the oil, extending its service life, and reducing the harmful substances that may be produced.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a low-temperature heat transfer oil containing an oxidation inhibitor, comprising the following components in weight percentage: 95.9-96.1% of an alkane base oil, 1.9-2.1% of a high-temperature antioxidant, 0.4-0.6% of an extreme pressure anti-wear agent, 0.4-0.6% of a corrosion and rust inhibitor, 0.4-0.6% of a metal passivator, and 0.4-0.6% of an ashless circulating oil composite additive.

[0008] Specifically, the alkane base oil is one of mineral oil-based alkane oil or synthetic alkane oil, or a mixed alkane oil; The mineral oil-based alkane oil is obtained from petroleum through a refining process, wherein the refining process is to subject petroleum to a hydrocracking treatment; The synthetic alkane oil is prepared by a chemical synthesis method, and the synthetic alkane oil is produced by polymerizing low molecular weight olefins.

[0009] Specifically, the high temperature antioxidant is one of phenolic antioxidants, amine antioxidants, sulfide antioxidants, organophosphorus antioxidants, or molybdenum and tungsten-based antioxidants, or a mixed antioxidant; The phenolic antioxidant is one or a mixture of tert-butyl hydroquinone or di(3,5-di-tert-butyl-4-hydroxyphenyl) sulfide; The amine antioxidant used is dicyclohexyl thioamine; The sulfide antioxidant used is dialkyl thiophosphate; The organophosphorus antioxidant used is tris(2,4-di-tert-butylphenyl) phosphate; The molybdenum and tungsten based antioxidants are ammonium molybdate or sodium molybdate or a mixture thereof.

[0010] Specifically, the extreme pressure anti-wear agent is one of sulfur-phosphorus anti-wear agents, chlorine anti-wear agents, zinc anti-wear agents, organic friction modifiers or molar acid salt anti-wear agents, or a mixed anti-wear agent; The sulfur-phosphorus anti-wear agent is one or a mixture of molybdenum disulfide or phosphate; The chlorine anti-wear agent used is chlorinated paraffin; The zinc anti-wear agent used is zinc dienyl dithiophosphate; The molar acid salt anti-wear agent is a molar acid salt.

[0011] Specifically, the anticorrosion and rust preventive is an additive type anticorrosion and rust preventive; The additives in the additive-type anticorrosion and rust inhibitor include phosphates, sulfur-phosphorus compounds, and zinc-containing rust-proof components.

[0012] Specifically, the metal passivator is one or a mixture of a nitric acid passivator, an organic acid salt passivator, a zinc passivator or a titanium passivator.

[0013] Specifically, the ashless circulating oil composite additive includes one or a mixture of ashless extreme pressure anti-wear agent, antioxidant, detergent dispersant or anti-foaming agent.

[0014] The preparation process of low-temperature heat transfer oil containing oxidation inhibitor includes the following steps: S1. Preparation of alkane base oil: filtering, dehydrating and deacidifying the alkane base oil; S2. Adding a high-temperature antioxidant: heating and stirring the alkane base oil to 40° C.-60° C., and then adding the high-temperature antioxidant to the alkane base oil. During the adding process, it is necessary to detect whether the high-temperature antioxidant is completely dissolved in the alkane base oil to obtain a mixed oil A; S3, adding other functional additives: then, in the process of stirring, adding extreme pressure anti-wear agent, anti-corrosion and rust inhibitor, metal passivator and ashless circulating oil composite additive to the mixed oil A in sequence to obtain mixed oil B; S4. Homogenization and stabilization treatment: homogenize the mixed oil B by high shear mixer or ultrasonic equipment to ensure the stability and uniformity of the oil; S5. Filtration and impurity removal of oil products: The mixed oil B after being evenly mixed is filtered through a precision filtering device, and a 0.1-5 micron filter screen is used to remove the existing undissolved matter, bubbles or other tiny impurities to obtain a low-temperature heat transfer oil containing an oxidation inhibitor; S6. Performance testing: The low-temperature heat transfer oil containing oxidation inhibitors is subjected to a series of performance tests to ensure that the low-temperature heat transfer oil containing oxidation inhibitors meets the use requirements; S7. Packaging and storage: Low-temperature heat transfer oil containing oxidation inhibitors should be packaged with special anti-corrosion packaging materials, and the storage environment should avoid high temperature, humidity and strong light.

[0015] Specifically, the filtration in S1 is used to remove impurities and moisture in the alkane base oil, and the dehydration is to remove moisture by heating or vacuum pumping; and the deacidification is to remove acid by chemical neutralization; Filtration: Use a 10-20 micron filter to perform coarse filtration on the alkane base oil to remove solid impurities in the alkane base oil; Dehydration: removing water by heating to 60-80°C or vacuum treatment; Deacidification adds hydroxides or carbonates to reduce acidic substances.

[0016] Specifically, the performance test in S6 includes: viscosity measurement, oxidation stability test, thermal conductivity test, acid value and base value test, and pour point and solidification point test; The viscosity measurement uses a rotational viscometer or a Brookfield viscometer to measure the viscosity of the low-temperature heat transfer oil containing an oxidation inhibitor at low and high temperatures; The oxidation stability test is to heat the low-temperature heat transfer oil containing the oxidation inhibitor at 180°C and introduce oxygen to test the effect of the oxidation inhibitor; The thermal conductivity test uses a thermal conductivity instrument to measure the thermal conductivity of the oil; The acid value and base value test adopts titration method or potentiometric method to determine the acid value of the oil; The pour point and solidification point test is performed on the oil product through a low temperature box.

[0017] Technical effects and advantages of the present invention: The present invention adds a high-temperature antioxidant to the alkane base oil, improves the oxidation stability of the alkane base oil, reduces the occurrence of oxidation reactions, can effectively extend the service life of the heat transfer oil, and reduce the cost of frequent oil replacement; the use of the high-temperature antioxidant can prevent excessive oxidation of the oil, avoid equipment failure caused by oil problems, and ensure the safe operation of industrial equipment; the low-temperature heat transfer oil containing the high-temperature antioxidant generates less harmful substances during use, helps to reduce environmental pollution, and meets the needs of modern green industry; In addition, extreme pressure anti-wear agents, corrosion inhibitors, metal passivators and ash-free circulating oil composite additives are added to the alkane base oil to improve the stability of the heat transfer oil; extreme pressure anti-wear agents protect mechanical parts under high load and extreme working conditions, reduce wear and extend equipment life. Extreme pressure anti-wear agents can form a protective film under extreme friction conditions to prevent direct contact between metal surfaces, thereby reducing wear and improving the operating efficiency of the machinery; corrosion inhibitors prevent corrosion and rust on metal surfaces, and heat transfer oil undergoes oxidation reaction with oxygen to form organic acids, aldehydes, ketones and other substances. The corrosion inhibitors prevent metal parts from being oxidized and corroded during operation; metal passivators form a protective film on the metal surface to reduce the reaction between metal and heat transfer oil and oxygen to form organic acids, aldehydes, ketones and other substances, thereby effectively preventing metal corrosion and oxidation; ash-free circulating oil composite additives can reduce carbon deposition of heat transfer oil at high temperatures, which has a significant advantage in extending service life; During preparation, the heat transfer oil is homogenized by a high shear mixer or ultrasonic equipment to ensure the stability and uniformity of the oil, and a 0.1-5 micron filter is used to remove undissolved matter, bubbles or other tiny impurities to improve the quality of the heat transfer oil.

[0018] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the preparation process provided by the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] The low-temperature heat transfer oil containing oxidation inhibitors provided in an embodiment of the present invention comprises the following components in weight percentage: 95.9-96.1% alkane base oil, 1.9-2.1% high-temperature antioxidant, 0.4-0.6% extreme pressure anti-wear agent, 0.4-0.6% corrosion and rust inhibitor, 0.4-0.6% metal passivator, and 0.4-0.6% ash-free circulating oil composite additive.

[0022] In this embodiment, preferably, the alkane base oil is one of mineral oil-based alkane oil or synthetic alkane oil or a mixed alkane oil; The mineral oil-based alkane oil is obtained from petroleum through a refining process, wherein the refining process is to subject petroleum to a hydrocracking treatment; The synthetic alkane oil is prepared by a chemical synthesis method, and the synthetic alkane oil is produced by polymerizing low molecular weight olefins; It should be noted that alkane base oils have good low-temperature fluidity, high thermal stability and low evaporation loss. Mineral oil-based alkane oils and synthetic alkane oils have good fluidity in low-temperature environments. Alkane base oils have good thermal conductivity and can effectively transfer heat. They flow in low-temperature environments and are suitable for use in cooling and heating systems. They remain stable at high temperatures and are not easily decomposed or oxidized.

[0023] In this embodiment, preferably, the high temperature antioxidant is one of phenolic antioxidants, amine antioxidants, sulfide antioxidants, organophosphorus antioxidants, or molybdenum and tungsten-based antioxidants, or a mixed antioxidant; The phenolic antioxidant is one or a mixture of tert-butyl hydroquinone or di(3,5-di-tert-butyl-4-hydroxyphenyl) sulfide; The amine antioxidant used is dicyclohexyl thioamine; The sulfide antioxidant used is dialkyl thiophosphate; The organophosphorus antioxidant used is tris(2,4-di-tert-butylphenyl) phosphate; The molybdenum and tungsten based antioxidants are one or a mixture of ammonium molybdate or sodium molybdate; It should be noted that phenolic antioxidants neutralize free radicals by providing hydrogen atoms, thereby preventing the further development of oxidation reactions. Phenolic antioxidants have good thermal stability and antioxidant properties, are stable at high temperatures, and can effectively delay oxidation reactions; they are non-corrosive to metals; amine antioxidants inhibit oxidation reactions by reacting with oxidative free radicals to form stable products. Amine antioxidants have good thermal stability and antioxidant effects, are suitable for high temperature conditions, and can effectively reduce the oxidation reaction rate of oil products; sulfide antioxidants inhibit oxidation reactions by reacting their sulfur atoms with oxidizing substances, have strong antioxidant capacity, and are suitable for use under high temperature conditions; organophosphorus antioxidants combine with oxidative free radicals through their phosphate structure to form stable intermediates, thereby preventing the spread of oxidation reactions, have a strong inhibitory effect on high-temperature oxidation, and can remain stable under extreme conditions; molybdenum and tungsten-based antioxidants can effectively reduce oxidation and wear by forming molybdenum or tungsten compounds, have excellent high temperature resistance and antioxidant capacity, and are suitable for high load and high temperature occasions.

[0024] In this embodiment, preferably, the extreme pressure anti-wear agent is one of sulfur-phosphorus anti-wear agents, chlorine anti-wear agents, zinc anti-wear agents, organic friction modifiers or molar acid salt anti-wear agents, or a mixed anti-wear agent; The sulfur-phosphorus anti-wear agent is one or a mixture of molybdenum disulfide or phosphate; The chlorine anti-wear agent used is chlorinated paraffin; The zinc anti-wear agent used is zinc dienyl dithiophosphate; The molar acid salt anti-wear agent is a molar acid salt; It should be noted that extreme pressure anti-wear agents can form a thin film on the metal contact surface to reduce direct contact, thereby effectively slowing down the wear process. Especially under high speed or heavy load conditions, they can remain stable under high pressure conditions to prevent direct contact between metal parts and reduce metal fatigue, abrasion and damage. By forming a lubricating film on the friction surface, the friction coefficient is reduced, the operating efficiency of mechanical parts is improved, and energy loss is reduced. Because they can reduce friction and wear, extreme pressure anti-wear agents help to extend the service life of mechanical equipment. Under high load conditions, extreme pressure anti-wear agents can prevent sintering or adhesion on the metal surface, thereby avoiding equipment damage. Sulfur-phosphorus anti-wear agents can form a protective sulfide film on the friction surface, effectively reducing the friction between metals; Chlorine anti-wear agents can form a chlorinated film on the friction surface, reducing friction and providing additional protection; Zinc anti-wear agents can form a protective film under high temperature and high pressure conditions; Organic friction modifiers reduce friction and wear and improve lubrication performance by improving the friction characteristics of lubricants; Molar acid salt anti-wear agents form a film on the friction surface, reducing direct contact between metal surfaces.

[0025] In this embodiment, preferably, the anticorrosion and rust inhibitor is an additive type anticorrosion and rust inhibitor; The additives in the additive-type anticorrosion and rust inhibitor include phosphates, sulfur-phosphorus compounds, and zinc-containing rust-proof ingredients; It should be noted that additive-type anti-corrosion and rust inhibitors are usually used as additives in lubricating oil or hydraulic oil, playing an anti-rust role in the lubricating oil to prevent metal parts from oxidative corrosion during operation.

[0026] In this embodiment, preferably, the metal passivator is one or a mixture of a nitric acid passivator, an organic acid salt passivator, a zinc passivator or a titanium passivator; It should be noted that the nitric acid in the nitric acid passivator can oxidize the metal surface to form a protective film; Organic acid salt passivators usually do not cause excessive oxidation on metal surfaces and can be used at lower temperatures; Zinc passivation can provide additional corrosion protection by treating metals such as steel with zinc to form a zinc oxide film or zinc alloy layer on the surface; Titanium passivators usually use titanium oxide film to prevent corrosion and enhance their corrosion resistance.

[0027] In this embodiment, preferably, the ashless circulating oil composite additive includes one or a mixture of ashless extreme pressure anti-wear agent, antioxidant, detergent dispersant or anti-foaming agent; It should be noted that: ashless extreme pressure anti-wear agent can provide effective anti-wear protection under high load conditions and reduce equipment wear; Antioxidants enhance the stability of oil products under high temperature conditions and reduce the oxidation and deterioration of oil products; Detergents and dispersants prevent the accumulation of dirt and sediment in the oil and keep the oil clean; Corrosion inhibitors reduce corrosion of metal parts, especially in wet and corrosive environments; Antifoaming agents control the generation of foam in oil products and ensure the stability and lubricating effect of lubricating oil.

[0028] like Figure 1 As shown, the preparation process of low-temperature heat transfer oil containing oxidation inhibitor includes the following steps: S1. Preparation of alkane base oil: filtering, dehydrating and deacidifying the alkane base oil; S2. Adding a high-temperature antioxidant: heating and stirring the alkane base oil to 40° C.-60° C., and then adding the high-temperature antioxidant to the alkane base oil. During the adding process, it is necessary to detect whether the high-temperature antioxidant is completely dissolved in the alkane base oil to obtain a mixed oil A; S3, adding other functional additives: then, in the process of stirring, adding extreme pressure anti-wear agent, anti-corrosion and rust inhibitor, metal passivator and ashless circulating oil composite additive to the mixed oil A in sequence to obtain mixed oil B; S4. Homogenization and stabilization treatment: homogenize the mixed oil B by high shear mixer or ultrasonic equipment to ensure the stability and uniformity of the oil; S5. Filtration and impurity removal of oil products: The mixed oil B after being evenly mixed is filtered through a precision filtering device, and a 0.1-5 micron filter screen is used to remove the existing undissolved matter, bubbles or other tiny impurities to obtain a low-temperature heat transfer oil containing an oxidation inhibitor; S6. Performance testing: The low-temperature heat transfer oil containing oxidation inhibitors is subjected to a series of performance tests to ensure that the low-temperature heat transfer oil containing oxidation inhibitors meets the use requirements; S7. Packaging and storage: Low-temperature heat transfer oil containing oxidation inhibitors should be packaged with special anti-corrosion packaging materials, and the storage environment should avoid high temperature, humidity and strong light.

[0029] In this embodiment, preferably, the filtration in S1 is used to remove impurities and moisture in the alkane base oil, and the dehydration is performed by heating or vacuum extraction to remove moisture; and the deacidification is performed by chemical neutralization to remove acid; Filtration: Use a 10-20 micron filter to perform coarse filtration on the alkane base oil to remove solid impurities in the alkane base oil; Dehydration: removing water by heating to 60-80°C or vacuum treatment; Deacidification adds hydroxides or carbonates to reduce acidic substances; It should be noted that by dehydrating, deacidifying and filtering the alkane base oil, the cleanliness of the alkane base oil is improved, making it easier to add various additives later.

[0030] In this embodiment, preferably, the performance test in S6 includes: viscosity measurement, oxidation stability test, thermal conductivity test, acid value and base value test, and pour point and solidification point test; The viscosity measurement uses a rotational viscometer or a Brookfield viscometer to measure the viscosity of the low-temperature heat transfer oil containing an oxidation inhibitor at low and high temperatures; The oxidation stability test is to heat the low-temperature heat transfer oil containing the oxidation inhibitor at 180°C and introduce oxygen to test the effect of the oxidation inhibitor; The thermal conductivity test uses a thermal conductivity instrument to measure the thermal conductivity of the oil; The acid value and base value test adopts titration method or potentiometric method to determine the acid value of the oil; The pour point and solidification point test is carried out by using a low temperature box to test the pour point and solidification point of the oil product; It should be noted that by testing the performance of the heat transfer oil, it is easy to determine whether the heat transfer oil meets the production standards.

[0031] Embodiment 1: Step 1, preparation of alkane base oil: filtering, dehydrating and deacidifying the alkane base oil, wherein the alkane base oil accounts for 96.1%; Step 2, adding a high-temperature antioxidant: heating and stirring the alkane base oil to 40° C.-60° C., and then adding 2.1% of a high-temperature antioxidant to the alkane base oil. During the adding process, it is necessary to detect whether the high-temperature antioxidant is completely dissolved in the alkane base oil to obtain a mixed oil A; Step 3, adding other functional additives: Then, in the process of stirring, 0.6% of extreme pressure anti-wear agent, 0.4% of anti-corrosion and rust inhibitor, 0.4% of metal passivator, and 0.4% of ashless circulating oil composite additive are added to the mixed oil A in sequence to obtain mixed oil B; Step 4: Homogenization and stabilization treatment: homogenize the mixed oil B by a high shear mixer or ultrasonic equipment to ensure the stability and uniformity of the oil; Step 5: Filtration and impurity removal of oil products: The mixed oil B after being evenly mixed is filtered through a precision filtering device, and a 0.1-5 micron filter is used to remove the undissolved matter, bubbles or other tiny impurities to obtain a low-temperature heat transfer oil containing an oxidation inhibitor; Step 6: Performance testing: subject the low-temperature heat transfer oil containing oxidation inhibitors to a series of performance tests to ensure that the low-temperature heat transfer oil containing oxidation inhibitors meets the use requirements; Step 7. Packaging and storage: Low-temperature heat transfer oil containing oxidation inhibitors should be packaged with special anti-corrosion packaging materials, and the storage environment should avoid high temperature, humidity and strong light.

[0032] Embodiment 2: Step 1, preparation of alkane base oil: filtering, dehydrating and deacidifying the alkane base oil, wherein the alkane base oil accounts for 96.1%; Step 2, adding high temperature antioxidant: heating and stirring the alkane base oil to 40°C-60°C, and then adding 1.9% of high temperature antioxidant to the alkane base oil. During the adding process, it is necessary to detect whether the high temperature antioxidant is completely dissolved in the alkane base oil to obtain mixed oil A; Step 3, adding other functional additives: Then, in the process of stirring, 0.6% of extreme pressure anti-wear agent, 0.6% of anti-corrosion and rust inhibitor, 0.4% of metal passivator, and 0.4% of ashless circulating oil composite additive are added to the mixed oil A in sequence to obtain mixed oil B; Step 4: Homogenization and stabilization treatment: homogenize the mixed oil B by a high shear mixer or ultrasonic equipment to ensure the stability and uniformity of the oil; Step 5: Filtration and impurity removal of oil products: The mixed oil B after being evenly mixed is filtered through a precision filtering device, and a 0.1-5 micron filter is used to remove the undissolved matter, bubbles or other tiny impurities to obtain a low-temperature heat transfer oil containing an oxidation inhibitor; Step 6: Performance testing: subject the low-temperature heat transfer oil containing oxidation inhibitors to a series of performance tests to ensure that the low-temperature heat transfer oil containing oxidation inhibitors meets the use requirements; Step 7. Packaging and storage: Low-temperature heat transfer oil containing oxidation inhibitors should be packaged with special anti-corrosion packaging materials, and the storage environment should avoid high temperature, humidity and strong light; Embodiment three: Step 1, preparation of alkane base oil: filtering, dehydrating and deacidifying the alkane base oil, wherein the alkane base oil accounts for 95.9%; Step 2, adding a high-temperature antioxidant: heating and stirring the alkane base oil to 40° C.-60° C., and then adding 2.1% of a high-temperature antioxidant to the alkane base oil. During the adding process, it is necessary to detect whether the high-temperature antioxidant is completely dissolved in the alkane base oil to obtain a mixed oil A; Step 3, adding other functional additives: Then, in the process of stirring, 0.6% of extreme pressure anti-wear agent, 0.6% of anti-corrosion and rust inhibitor, 0.4% of metal passivator, and 0.4% of ashless circulating oil composite additive are added to the mixed oil A in sequence to obtain mixed oil B; Step 4: Homogenization and stabilization treatment: homogenize the mixed oil B by a high shear mixer or ultrasonic equipment to ensure the stability and uniformity of the oil; Step 5: Filtration and impurity removal of oil products: The mixed oil B after being evenly mixed is filtered through a precision filtering device, and a 0.1-5 micron filter is used to remove the undissolved matter, bubbles or other tiny impurities to obtain a low-temperature heat transfer oil containing an oxidation inhibitor; Step 6: Performance testing: subject the low-temperature heat transfer oil containing oxidation inhibitors to a series of performance tests to ensure that the low-temperature heat transfer oil containing oxidation inhibitors meets the use requirements; Step 7. Packaging and storage: Low-temperature heat transfer oil containing oxidation inhibitors should be packaged with special anti-corrosion packaging materials, and the storage environment should avoid high temperature, humidity and strong light; Comparing the above-mentioned Example 1, Example 2 and Example 3: A control group is set as a heat transfer oil in which alkane base oil accounts for 100%. Although alkane base oil generally has strong antioxidant properties, especially synthetic alkane oil, it can maintain stability for a long time at a higher temperature; Under long-term operation, the control group is compared with Example 1, Example 2 and Example 3. The heat transfer oil added with the high-temperature antioxidant has a more significant anti-oxidation effect. The high-temperature antioxidant reacts with oxygen to inhibit the oxidation reaction of the heat transfer oil, reduce the generation of free radicals and peroxides in the heat transfer oil, and thus extend the service life of the heat transfer oil: prevent the heat transfer oil from oxidative degradation at high temperatures, reduce adverse phenomena such as increased viscosity and increased acid value; reduce corrosive substances generated by oxidation of the heat transfer oil, prevent the metal surface from being corroded, and the high-temperature antioxidant can slow down the volatilization of the heat transfer oil and reduce the loss of oil products in a high-temperature working environment; And in comparison of Example 1, Example 2 and Example 3, it is found that the content of alkane base oil in Example 3 is less, and after being prepared into heat transfer oil, the purity of the heat transfer oil is low. Compared with Example 1 and Example 2, the heat transfer oil in Example 3 will produce about 5-10g of impurities in 1L of heat transfer oil after long-term use, and 1L of heat transfer oil in Example 1 will produce about 1-4g of impurities, and 1L of heat transfer oil in Example 2 will produce about 1-4g of impurities, but the content of high-temperature antioxidant in Example 2 is low, resulting in the heat transfer oil being used for a long time. Compared with Example 1, the heat transfer oil reacts with oxygen to oxidize, and the content of organic acids, aldehydes, ketones and other substances is increased by 10%; In summary, selecting the formula of Example 1 can improve the purity of the heat transfer oil, prevent the heat transfer oil from generating a large amount of impurities when in use, and increase the content of the high-temperature antioxidant, which can effectively inhibit the oxidation of the heat transfer oil by reacting with oxygen to form organic acids, aldehydes, ketones and other substances, and the content of the extreme pressure anti-wear agent is set higher to reduce the wear of the equipment and the generation of impurities.

[0033] The technical indicators of the low-temperature heat transfer oil containing oxidation inhibitors produced are shown in the following table: This allows low-temperature heat transfer oil containing oxidation inhibitors to be used in low-temperature environments, and has higher fluidity and higher stability at low temperatures.

[0034] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-temperature heat transfer oil containing an oxidation inhibitor, characterized in that: The composition is as follows according to weight percentage: alkane base oil accounts for 95.9-96.1%, high temperature antioxidant accounts for 1.9-2.1%, extreme pressure anti-wear agent accounts for 0.4-0.6%, anti-corrosion and anti-rust agent accounts for 0.4-0.6%, metal passivator accounts for 0.4-0.6%, and ash-free circulating oil composite additive accounts for 0.4-0.6%.

2. The low-temperature heat transfer oil containing an oxidation inhibitor according to claim 1, characterized in that: The alkane base oil is one of mineral oil-based alkane oil or synthetic alkane oil or a mixed alkane oil; The mineral oil-based alkane oil is obtained from petroleum through a refining process, wherein the refining process is to subject petroleum to a hydrocracking treatment; The synthetic alkane oil is prepared by a chemical synthesis method, and the synthetic alkane oil is produced by polymerizing low molecular weight olefins.

3. The low-temperature heat transfer oil containing an oxidation inhibitor according to claim 1, characterized in that: The high temperature antioxidant is one of phenolic antioxidants, amine antioxidants, sulfide antioxidants, organophosphorus antioxidants, or molybdenum and tungsten based antioxidants, or a mixed antioxidant; The phenolic antioxidant is one or a mixture of tert-butyl hydroquinone or di(3,5-di-tert-butyl-4-hydroxyphenyl) sulfide; The amine antioxidant used is dicyclohexyl thioamine; The sulfide antioxidant used is dialkyl thiophosphate; The organophosphorus antioxidant used is tris(2,4-di-tert-butylphenyl) phosphate; The molybdenum and tungsten based antioxidants are ammonium molybdate or sodium molybdate or a mixture thereof.

4. The low-temperature heat transfer oil containing an oxidation inhibitor according to claim 1, characterized in that: The extreme pressure anti-wear agent is one of sulfur-phosphorus anti-wear agents, chlorine anti-wear agents, zinc anti-wear agents, organic friction modifiers or molar acid salt anti-wear agents, or a mixed anti-wear agent; The sulfur-phosphorus anti-wear agent is one or a mixture of molybdenum disulfide or phosphate; The chlorine anti-wear agent used is chlorinated paraffin; The zinc anti-wear agent used is zinc dienyl dithiophosphate; The molar acid salt anti-wear agent is a molar acid salt.

5. The low-temperature heat transfer oil containing an oxidation inhibitor according to claim 1, characterized in that: The anticorrosion and rust preventive agent is an additive type anticorrosion and rust preventive agent; The additives in the additive-type anticorrosion and rust inhibitor include phosphates, sulfur-phosphorus compounds, and zinc-containing rust-proof components.

6. The low-temperature heat transfer oil containing an oxidation inhibitor according to claim 1, characterized in that: The metal passivator is one or a mixture of nitric acid passivator, organic acid salt passivator, zinc passivator or titanium passivator.

7. The low-temperature heat transfer oil containing an oxidation inhibitor according to claim 1, characterized in that: The ashless circulating oil composite additive comprises one or a mixture of an ashless extreme pressure anti-wear agent, an antioxidant, a detergent dispersant or an anti-foaming agent.

8. A process for preparing low-temperature heat transfer oil containing an oxidation inhibitor, characterized in that: The preparation method of the low-temperature heat transfer oil containing oxidation inhibitors according to claims 1 to 7 comprises the following steps: S1. Preparation of alkane base oil: filtering, dehydrating and deacidifying the alkane base oil; S2. Adding a high-temperature antioxidant: heating and stirring the alkane base oil to 40° C.-60° C., and then adding the high-temperature antioxidant to the alkane base oil. During the adding process, it is necessary to detect whether the high-temperature antioxidant is completely dissolved in the alkane base oil to obtain a mixed oil A; S3, adding other functional additives: then, in the process of stirring, adding extreme pressure anti-wear agent, anti-corrosion and rust inhibitor, metal passivator and ashless circulating oil composite additive to the mixed oil A in sequence to obtain mixed oil B; S4. Homogenization and stabilization treatment: homogenize the mixed oil B by high shear mixer or ultrasonic equipment to ensure the stability and uniformity of the oil; S5. Filtration and impurity removal of oil products: The mixed oil B after being evenly mixed is filtered through a precision filtering device, and a 0.1-5 micron filter screen is used to remove the existing undissolved matter, bubbles or other tiny impurities to obtain a low-temperature heat transfer oil containing an oxidation inhibitor; S6. Performance testing: The low-temperature heat transfer oil containing oxidation inhibitors is subjected to a series of performance tests to ensure that the low-temperature heat transfer oil containing oxidation inhibitors meets the use requirements; S7. Packaging and storage: Low-temperature heat transfer oil containing oxidation inhibitors should be packaged with special anti-corrosion packaging materials, and the storage environment should avoid high temperature, humidity and strong light.

9. The process for preparing low-temperature heat transfer oil containing oxidation inhibitor according to claim 8, characterized in that: The filtration in S1 is used to remove impurities and moisture in the alkane base oil, and the dehydration removes moisture by heating or vacuum extraction; and deacidification by chemical neutralization; Filtration: Use a 10-20 micron filter to perform coarse filtration on the alkane base oil to remove solid impurities in the alkane base oil; Dehydration: removing water by heating to 60-80°C or vacuum treatment; Deacidification adds hydroxides or carbonates to reduce acidic substances.

10. The process for preparing low-temperature heat transfer oil containing oxidation inhibitor according to claim 8, characterized in that: The performance tests in S6 include: viscosity measurement, oxidation stability test, thermal conductivity test, acid value and base value test, and pour point and solidification point test; The viscosity measurement uses a rotational viscometer or a Brookfield viscometer to measure the viscosity of the low-temperature heat transfer oil containing an oxidation inhibitor at low and high temperatures; The oxidation stability test is to heat the low-temperature heat transfer oil containing the oxidation inhibitor at 180°C and introduce oxygen to test the effect of the oxidation inhibitor; The thermal conductivity test uses a thermal conductivity instrument to measure the thermal conductivity of the oil; The acid value and base value test adopts titration method or potentiometric method to determine the acid value of the oil; The pour point and solidification point test is performed on the oil product through a low temperature box.

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