High-temperature-resistant synthetic heat-conducting oil with good flowability

Abstract

The application provides a high-temperature-resistant synthetic heat conducting oil with good fluidity. The high-temperature-resistant synthetic heat conducting oil with good fluidity comprises the following components in parts by mass: 1-3 parts by mass of high-temperature antioxidant, 0.5-3 parts by mass of dispersant, 0.01-0.05 parts by mass of metal deactivator, 1.5-3 parts by mass of detergent, 0.01-0.05 parts by mass of surfactant, 85-90 parts by mass of composite base oil, and the surfactant is sodium dioctyl sulfosuccinate; wherein the dispersant has the structure shown in the following formula I. The high-temperature-resistant synthetic heat conducting oil with good fluidity prepared by using the application has low deterioration rate, good thermal stability, less residue, low acid value increase, is not easy to be oxidized, has good antioxidant property, and has lower kinematic viscosity and excellent comprehensive performance.

Description

Technical Field

[0001] This invention belongs to the field of heat transfer oil technology, specifically relating to a high-temperature resistant synthetic heat transfer oil with good fluidity. Background Technology

[0002] Heat transfer oil, also known as thermal fluid, is generally composed of base oil and additives. It has advantages such as being non-toxic, having low water absorption, easy temperature control, non-corrosive to equipment, high cost-effectiveness, convenient recycling and disposal, and low investment, and is therefore widely used in various industries including petroleum, petrochemicals, coal chemicals, power, metallurgy, textile printing and dyeing, non-ferrous metals, building materials, grain, oleochemicals, food processing, pharmaceuticals, and electronics.

[0003] Additives in heat transfer oils include dispersants. Dispersants such as monoalkenyl succinimide can disperse impurities and deposits in heat transfer oils evenly, preventing them from agglomerating into large clumps and improving the fluidity of the heat transfer oil. However, due to the high viscosity of existing heat transfer oils, the use of dispersants does not significantly improve the fluidity of the heat transfer oil. Furthermore, existing dispersants have poor encapsulation performance for impurities and deposits in heat transfer oils, leading to the formation of sediments that clog oil passages and fuel injectors, resulting in engine failure.

[0004] In view of the problems existing in existing heat transfer oils, the present invention aims to provide a high-temperature resistant synthetic heat transfer oil with low viscosity, good fluidity, resistance to decomposition at high temperatures, good encapsulation of impurities and sediments in the heat transfer oil, low sludge formation, good oxidation resistance, and low clogging of oil passages and nozzles. Summary of the Invention

[0005] The purpose of this invention is to provide a high-temperature resistant synthetic heat transfer oil with good fluidity to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: On one hand, the present invention provides a high-temperature resistant synthetic heat transfer oil with good fluidity, comprising the following components in parts by weight: 1-3 parts by weight of high-temperature antioxidant, 0.5-3 parts by weight of dispersant, 0.01-0.05 parts by weight of metal passivator, 1.5-3 parts by weight of detergent, 0.01-0.05 parts by weight of surfactant, and 85-90 parts by weight of composite base oil;

[0007] The dispersant has the structure shown in Formula I:

[0008]

[0009] Where R represents an aromatic group, s1 represents an integer from 1 to 5, and s2 represents an integer from 2 to 10;

[0010] The surfactant is sodium dioctyl sulfosuccinate.

[0011] As a further improvement, the high-temperature antioxidant is alkylated diphenylamine and 4,4'-methylenebis(2,6-di-tert-butylphenol) in a mass ratio of 1:3-6.

[0012] As a further improvement, the metal passivating agent is at least one selected from 2,5-dimercapto-1,3,4-thiadiazole derivatives, 2-mercaptobenzothiadiazole, and sodium 2-mercaptobenzothiadiazole.

[0013] As a further improvement, the detergent is low-alkalinity calcium petroleum sulfonate.

[0014] As a further improvement, the composite base oil is a mixture of metallocene polya-olefin mPAO and alkylbenzene heat transfer oil.

[0015] As a further improvement, 0.05-0.2 parts by weight of rust inhibitor are also included.

[0016] As a further improvement, the rust inhibitor is at least one of fumed nitrate and barium petroleum sulfonate.

[0017] As a further improvement, the method for preparing the dispersant includes the following steps:

[0018] a) An olefin-containing compound, methacrylic acid, and solvent A are added to a reaction vessel, and then a chain initiator and a chain transfer agent are added to react and obtain intermediate one;

[0019] b) Under an inert gas atmosphere, polyethylene glycol monomethyl ether and indigo anhydride were added to a reaction vessel to carry out the reaction. After the reaction was completed, intermediate II was obtained.

[0020] c) Add intermediate one obtained in step a) and intermediate two obtained in step b) and solvent B to a reaction vessel to carry out the reaction. After the reaction is completed, intermediate three is obtained.

[0021] d) React the intermediate tris obtained in step c) with ethylene glycol ethyl ether. After the reaction is complete, concentrate and dry to obtain the dispersant.

[0022] As a further improvement, the molar ratio of intermediate one to intermediate two is 1:1-2, and the molar ratio of intermediate three to ethylene glycol ethyl ether is 1:0.5-2.

[0023] As a further improvement, the alkylated diphenylamine is at least one of dinonyldiphenylamine, octylbutyldiphenylamine, and p,p'-diisooctyldiphenylamine.

[0024] Compared with the prior art, the beneficial effects of the present invention are: the high-temperature resistant synthetic heat transfer oil with good fluidity obtained by using the present application has a low degradation rate, good thermal stability, less residue, low acid value increase, is not easily oxidized, has good antioxidant properties, and has low kinematic viscosity, thus having excellent comprehensive performance. Detailed Implementation

[0025] The present invention will be described below with reference to specific embodiments. It should be noted that the following embodiments are examples of the present invention and are used only to illustrate the invention, not to limit it. Other combinations and various modifications within the scope of the present invention can be made without departing from its spirit or scope.

[0026] In the following examples, except for dispersant IA, all other compound monomers and related reagents used were commercially available. Polyethylene glycol monomethyl ether was purchased from Jiangsu Haian Petrochemical Plant; alkylbenzene heat transfer oil was purchased from Shandong Beifang Zite Special Oil Co., Ltd., model ZD300; metallocene poly-α-olefin mPAO was purchased from Shanghai Daopu Chemical Co., Ltd.; and low-alkalinity calcium petroleum sulfonate was purchased from Jinzhou Chenghua New Materials Co., Ltd., model T101.

[0027] The dispersant IA The preparation method includes the following steps:

[0028] a) Add 1 mol styrene, 2 mol methacrylic acid and 10 mL water to a reaction vessel, then add 0.02 mol mercaptoacetic acid and 0.01 mol thioglycolic acid to react. The reaction temperature is 75℃ and the reaction time is 3 h to obtain intermediate one.

[0029] b) Under an inert gas atmosphere, 1 mol of polyethylene glycol monomethyl ether 1 mol of indomethacin anhydride was added to a reaction vessel and reacted at a temperature of 120°C for 1.5 h. After the reaction was completed, intermediate II was obtained.

[0030] c) Add 1 mol of intermediate one obtained in step a) and 1 mol of intermediate two obtained in step b) and 150 mL of N,N-dimethylformamide to a reaction vessel for reaction at 160℃ for 2 h. After the reaction is completed, intermediate three is obtained.

[0031] d) React 1 mol of intermediate tri obtained in step c) with 1.2 mol of ethylene glycol ethyl ether at a reaction temperature of 110°C for 1.5 h. After the reaction is complete, concentrate and dry to obtain dispersant IA.

[0032] The preparation of high-temperature resistant synthetic heat transfer oils 1-7 with good fluidity includes the following steps:

[0033] Take the required mass proportions of high-temperature antioxidant, dispersant, metal passivator, detergent, surfactant, and composite base oil and mix them at 35°C for 2 hours at a mixing speed of 100 r / min. After mixing evenly, a high-temperature resistant synthetic heat transfer oil with good fluidity is obtained.

[0034] The components and their contents used in high-temperature resistant synthetic heat transfer oil 1-7 with good fluidity are shown in Table 1-2:

[0035] Table 1

[0036]

[0037]

[0038] Table 2

[0039]

[0040]

[0041] The testing method is as follows:

[0042] Kinematic viscosity determination: According to GB / T 265, the test temperature is 40℃;

[0043] Thermal stability test: according to GB / T 23800-2009, 300℃ / 720h;

[0044] Thermal oxidation stability test: According to Appendix C of GB23971-2009, the test temperature is 175℃ and the test time is 72h;

[0045] Sludge determination: The sludge of the mineral heat transfer oil that has undergone the anti-coking test shall be tested according to the method specified in Appendix C of GB23971-2009.

[0046] The measured results are shown in Table 3:

[0047] Table 3

[0048]

[0049]

[0050] As can be seen from the comparison of Example 1 and Comparative Examples 1-2, the high-temperature resistant synthetic heat transfer oil with good fluidity prepared using the dispersant provided in this application has relatively low kinematic viscosity, less residue, lower acid value increase and lower degradation rate, good thermal stability and oxidation resistance, and is not easily oxidized.

[0051] As can be seen from the comparison of Examples 1 and 4-5, when the ratio of alkylated diphenylamine to 4,4'-methylenebis(2,6-di-tert-butylphenol) is within a suitable range, the resulting high-temperature resistant synthetic heat transfer oil with good fluidity has lower kinematic viscosity, better thermal stability, and is further protected from oxidation due to less residue and lower acid value increase.

[0052] As can be seen from the comparison of Examples 1-3, the high-temperature resistant synthetic heat transfer oil with good fluidity prepared using the components and component contents provided in this application has low kinematic viscosity, good thermal stability, less residue and low acid value increase, is not easily oxidized, and has good antioxidant properties.

[0053] In summary, the high-temperature resistant synthetic heat transfer oil with good fluidity prepared using this application has a low degradation rate, good thermal stability, less residue, low acid value increase, is not easily oxidized, has good antioxidant properties, and low kinematic viscosity, thus exhibiting excellent comprehensive performance.

[0054] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A high-temperature resistant synthetic heat transfer oil with good fluidity, characterized in that: The product comprises the following components in parts by weight: 1-3 parts by weight of high-temperature antioxidant, 0.5-3 parts by weight of dispersant, 0.01-0.05 parts by weight of metal passivator, 1.5-3 parts by weight of detergent, 0.01-0.05 parts by weight of surfactant, and 85-90 parts by weight of composite base oil; The dispersant has the structure shown in Formula I: Ⅰ； Where R represents an aromatic group, s1 represents an integer from 1 to 5, and s2 represents an integer from 2 to 10; The surfactant is sodium dioctyl sulfosuccinate; The high-temperature antioxidant is alkylated diphenylamine and 4,4'-methylenebis(2,6-di-tert-butylphenol) in a mass ratio of 1:3-6; The metal passivating agent is at least one of 2,5-dimercapto-1,3,4-thiadiazole derivatives, 2-mercaptobenzothiadiazole, and sodium 2-mercaptobenzothiadiazole. The cleaning agent is low-alkalinity calcium petroleum sulfonate; The composite base oil is a mixture of metallocene polyalphaolefin mPAO and alkylbenzene heat transfer oil.

2. The high-temperature resistant synthetic heat transfer oil with good fluidity according to claim 1, characterized in that: It also includes 0.05-0.2 parts by weight of rust inhibitor.

3. The high-temperature resistant synthetic heat transfer oil with good fluidity according to claim 2, characterized in that: The rust inhibitor is barium petroleum sulfonate.

4. The high-temperature resistant synthetic heat transfer oil with good fluidity according to claim 1, characterized in that: The method for preparing the dispersant includes the following steps: a) An olefin-containing compound, methacrylic acid, and solvent A are added to a reaction vessel, and then a chain initiator and a chain transfer agent are added to react and obtain intermediate one; b) Under an inert gas atmosphere, polyethylene glycol monomethyl ether and indigo anhydride were added to a reaction vessel to carry out the reaction. After the reaction was completed, intermediate II was obtained. c) The intermediate 1 obtained in step a) and the intermediate 2 obtained in step b) and solvent B are added to the reaction vessel to carry out the reaction. After the reaction is completed, intermediate 3 is obtained. d) React the intermediate tris obtained in step c) with ethylene glycol ethyl ether. After the reaction is complete, concentrate and dry to obtain the dispersant.

5. The high-temperature resistant synthetic heat transfer oil with good fluidity according to claim 4, characterized in that: The molar ratio of intermediate one to intermediate two is 1:1-2, and the molar ratio of intermediate three to ethylene glycol ethyl ether is 1:0.5-2.

6. The high-temperature resistant synthetic heat transfer oil with good fluidity according to claim 1, characterized in that: The alkylated diphenylamine is at least one of nonyl diphenylamine, octylbutyl diphenylamine, and p,p'-diisooctyl diphenylamine.

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