High-temperature-resistant synthetic aromatic hydrocarbon heat-conducting oil and preparation method thereof

Abstract

The invention discloses high-temperature-resistant synthetic aromatic hydrocarbon heat-conducting oil and a preparation method thereof. The invention belongs to the technical field of chemical engineering, and the conduction oil used in the invention takes dicyclohexylbenzene and a specific biphenyl derivative as main components, and can effectively transfer heat; meanwhile, the biphenyl derivative is prepared from cyclohexyl biphenyl and methyl biphenyl according to a certain proportion, and the cyclohexyl biphenyl and the methyl biphenyl are mutually matched with dicyclohexylbenzene, so that the heat conduction efficiency of the heat conduction oil is further improved, the heat conduction oil can quickly and uniformly transfer heat in a high-temperature environment, and the requirements of a high-temperature process are met; the high-temperature-resistant heat-conducting coating has excellent heat stability and dispersity, also has good corrosion resistance and heat conducting efficiency, and can meet the use requirements under various high-temperature working conditions.

Description

Technical Field

[0001] The present invention belongs to the technical field of chemical engineering, and specifically refers to a high-temperature resistant synthetic aromatic heat transfer oil and a preparation method thereof. Background Art

[0002] With the continuous growth of industrial high-temperature heating requirements, high-temperature resistant synthetic aromatic heat transfer oils have been widely used in the field of heat transfer oils due to their excellent thermal stability and chemical stability. However, existing heat transfer oils still have deficiencies in antioxidant performance, service life, and preparation processes under high-temperature conditions, which limit their application effects under extreme conditions. For example, the patent with publication number CN115305067B provides a heat transfer oil mainly composed of dicyclohexylbenzene and cyclohexylbiphenyl, where the weight ratio of dicyclohexylbenzene to cyclohexylbiphenyl is 0.20 - 20. This heat transfer oil has good thermal stability and fluidity and is suitable for various high-temperature heating scenarios. However, this technical solution does not fully consider the antioxidant performance of the heat transfer oil under long-term high-temperature operating conditions, which may cause the heat transfer oil to deteriorate due to oxidation during use, thereby shortening its service life. In addition, the specific preparation process of this heat transfer oil is described relatively briefly, which may be difficult to achieve precise control in actual production and affect the batch stability of the product.

[0003] On the other hand, the patent with publication number CN109486561B proposes an online cleaning agent for heat transfer oil and an online cleaning method. By using a cleaning agent containing components such as paraffinic base oil, aromatic base oil, and polycyclic thickening solvents, online cleaning of the heat transfer oil circulation system is achieved, avoiding the efficiency loss caused by shutdown maintenance. However, this technical solution mainly focuses on solving the problem of heat transfer oil coking and does not start from the material properties of the heat transfer oil itself to improve its high-temperature resistance. In addition, the components of this cleaning agent are complex, which may cause uncontrollable side reactions with the heat transfer oil during use and affect the normal performance of the heat transfer oil.

[0004] The above problems indicate that there are still certain deficiencies in existing heat transfer oil technologies in terms of high-temperature resistance, antioxidant ability, and preparation process optimization. Therefore, there is an urgent need to develop a new type of high-temperature resistant synthetic aromatic heat transfer oil and a preparation method thereof. By optimizing the composition ratio of aromatic compounds and introducing highly efficient antioxidant additives, the high-temperature resistance and service life of the heat transfer oil can be significantly improved, while simplifying the preparation process to ensure the stability and consistency of product performance, thus meeting the needs of the industrial field for high-performance heat transfer oils. Summary of the Invention

[0005] The object of the present invention is to provide a high-temperature resistant synthetic aromatic heat transfer oil and a preparation method thereof. The present invention aims to solve the problems that the existing heat transfer oil is prone to decomposition, has insufficient stability and poor dispersibility under high-temperature working conditions. The heat transfer oil used in the present invention takes dicyclohexylbenzene and a specific biphenyl derivative as the main components, and can effectively transfer heat. At the same time, the biphenyl derivative is composed of cyclohexylbiphenyl and methylbiphenyl in a certain proportion, and they cooperate with dicyclohexylbenzene to further improve the heat transfer efficiency of the heat transfer oil, enabling it to transfer heat quickly and evenly in a high-temperature environment and meet the requirements of high-temperature processes. The present invention not only has excellent thermal stability and dispersibility, but also has good corrosion resistance and heat transfer efficiency, and can meet the use requirements under various high-temperature working conditions.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows: A high-temperature resistant synthetic aromatic heat transfer oil and a preparation method thereof, the high-temperature resistant synthetic aromatic heat transfer oil comprises the following components: 20-35 parts of dicyclohexylbenzene, 15-30 parts of biphenyl derivative, 5-15 parts of antioxidant composite, 3-10 parts of heat stability aid, 1-7 parts of dispersant, 1-5 parts of anti-corrosion additive, 0.2-1.8 parts of surface activity regulator and 0.1-1.2 parts of nano-functional filler.

[0007] Preferably, the high-temperature resistant synthetic aromatic heat transfer oil comprises the following components: 25-30 parts of dicyclohexylbenzene, 18-24 parts of biphenyl derivative, 7-12 parts of antioxidant composite, 4-8 parts of heat stability aid, 2-5 parts of dispersant, 1-3 parts of anti-corrosion additive, 0.5-1.5 parts of surface activity regulator and 0.1-0.8 parts of nano-functional filler.

[0008] Preferably, the antioxidant composite is obtained by compounding hydroquinone, tert-butylhydroquinone, phosphite and thiodipropionate in a weight ratio of (3.0-4.0):(1.5-2.5):(0.8-1.2):(1.0-1.5).

[0009] Preferably, the heat stability aid is obtained by compounding polysiloxane, organic molybdenum compound and borate in a weight ratio of (2.0-3.0):(1.0-1.5):(0.5-1.0).

[0010] Preferably, the dispersant is obtained by compounding polyisobutylene succinimide and polyetheramine in a weight ratio of (1.5-2.5):(0.8-1.2).

[0011] Preferably, the nano-functional filler is composed of alumina and silicon nitride with a particle size of 20-50 nm and is mixed in a weight ratio of (1.2-1.8):1.

[0012] Preferably, the surface activity regulator is obtained by compounding polyethylene glycol and glyceryl fatty acid ester in a weight ratio of (1.0 - 1.5):(0.5 - 0.8).

[0013] Preferably, the biphenyl derivative is composed of cyclohexylbiphenyl and methylbiphenyl in a weight ratio of (1.5 - 2.5):(0.8 - 1.2).

[0014] The present invention also provides a preparation method of a high-temperature resistant synthetic aromatic heat transfer oil, and the preparation method includes the following steps:

[0015] (1) Ultrasonically stir and mix dicyclohexylbenzene, the biphenyl derivative and the antioxidant composite agent to obtain a first mixed solution;

[0016] (2) Shear and homogenize and emulsify the first mixed solution with the heat stabilizer and the dispersant, and then perform a freezing treatment to obtain a second mixed solution;

[0017] (3) Add the anti-corrosion additive, the surface activity regulator and the nano-functional filler to the second mixed solution and stir and mix to obtain the high-temperature resistant synthetic aromatic heat transfer oil.

[0018] Preferably, the working condition parameters of the ultrasonic stirring and mixing in the step (1) include: the ultrasonic power is 400 - 500W, the stirring time is 20 - 30 minutes, and the stirring speed is 400 - 600rpm.

[0019] The beneficial effects achieved by the present invention with the above structure are as follows: (1) The heat transfer oil used in the present invention has dicyclohexylbenzene and a specific biphenyl derivative as the main components, and can effectively transfer heat; (2) The biphenyl derivative in the present invention is composed of cyclohexylbiphenyl and methylbiphenyl in a certain proportion, and they cooperate with dicyclohexylbenzene to further improve the heat transfer efficiency of the heat transfer oil, enabling it to transfer heat quickly and evenly in a high-temperature environment and meet the requirements of high-temperature processes; (3) The present invention not only has excellent thermal stability and dispersibility, but also has good anti-corrosion performance and heat transfer efficiency, and can meet the use requirements under various high-temperature working conditions. Description of the Drawings

[0020] Figure 1 Thermal conductivity of the aromatic heat transfer oil.

[0021] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention, and do not constitute a limitation to the present invention. Detailed Embodiments

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to those described herein can be applied to the present invention. The preferred methods and materials described herein are for illustrative purposes only and do not limit the content of this application.

[0024] The experimental methods in the following embodiments are all conventional methods unless otherwise specified; the test materials and test strains used in the following embodiments are all obtained from commercial channels unless otherwise specified.

[0025] Example 1

[0026] A high-temperature resistant synthetic aromatic heat transfer oil and its preparation method

[0027] The high-temperature resistant synthetic aromatic heat transfer oil includes the following components: 25 parts of dicyclohexylbenzene, 24 parts of biphenyl derivative, 7 parts of antioxidant complex, 8 parts of heat stability aid, 2 parts of dispersant, 3 parts of anti-corrosion additive, 0.5 part of surface activity regulator, and 0.8 part of nano-functional filler.

[0028] Among them, the antioxidant complex is obtained by compounding hydroquinone, tert-butylhydroquinone, phosphite, and thiodipropionate in a weight ratio of 3.0:1.5:0.8:1.5.

[0029] Among them, the heat stability aid is obtained by compounding polysiloxane, organic molybdenum compound, and borate ester in a weight ratio of 3:1:1.

[0030] Among them, the dispersant is obtained by compounding polyisobutylene succinimide and polyetheramine in a weight ratio of 1.5:1.

[0031] Among them, the nano-functional filler is composed of alumina and silicon nitride with a particle size of 20 - 50 nm mixed in a weight ratio of 1.2:1.

[0032] Among them, the surface activity regulator is obtained by compounding polyethylene glycol and fatty acid glyceride in a weight ratio of 2:1.

[0033] Among them, the biphenyl derivative is composed of cyclohexylbiphenyl and methylbiphenyl in a weight ratio of 5:4.

[0034] The present invention also provides a preparation method of a high-temperature resistant synthetic aromatic heat transfer oil, and the preparation method includes the following steps:

[0035] (1) Ultrasonically stir and mix dicyclohexylbenzene, biphenyl derivatives and an antioxidant composite to obtain a first mixed solution;

[0036] (2) Subject the first mixed solution to shear homogenization and emulsification with a heat stabilizer and a dispersant, and then perform freezing treatment to obtain a second mixed solution;

[0037] (3) Add an anti-corrosion additive, a surface activity regulator and nano-functional fillers to the second mixed solution and stir and mix to obtain the high-temperature resistant synthetic aromatic heat transfer oil.

[0038] Among them, the working condition parameters of the ultrasonic stirring and mixing in step (1) include: the ultrasonic power is 450 W, the stirring time is 25 minutes, and the stirring speed is 500 rpm.

[0039] Example 2

[0040] A high-temperature resistant synthetic aromatic heat transfer oil and a preparation method thereof

[0041] The high-temperature resistant synthetic aromatic heat transfer oil includes the following components: 30 parts of dicyclohexylbenzene, 18 parts of biphenyl derivatives, 12 parts of an antioxidant composite, 4 parts of a heat stabilizer, 5 parts of a dispersant, 1 part of an anti-corrosion additive, 1.5 parts of a surface activity regulator and 0.1 part of nano-functional fillers.

[0042] Among them, the antioxidant composite is prepared by compounding hydroquinone, tert-butylhydroquinone, phosphite and thiodipropionate in a weight ratio of 4.0:2.5:1.2:1.5.

[0043] Among them, the heat stabilizer is prepared by compounding polysiloxane, organomolybdenum compound and borate in a weight ratio of 3:1.5:1.

[0044] Among them, the dispersant is prepared by compounding polyisobutylene succinimide and polyetheramine in a weight ratio of 2.5:1.2.

[0045] Among them, the nano-functional fillers are composed of alumina and silicon nitride with a particle size of 20-50 nm and are mixed in a weight ratio of 2:1.

[0046] Among them, the surface activity regulator is prepared by compounding polyethylene glycol and glycerol fatty acid ester in a weight ratio of 1.5:0.8.

[0047] Among them, the biphenyl derivatives are composed of cyclohexylbiphenyl and methylbiphenyl in a weight ratio of 2.5:1.2.

[0048] The present invention also provides a preparation method of a high-temperature resistant synthetic aromatic heat transfer oil, and the preparation method is carried out with reference to Example 1.

[0049] Example 3

[0050] A high-temperature resistant synthetic aromatic heat transfer oil and a preparation method thereof

[0051] The high-temperature resistant synthetic aromatic heat transfer oil comprises the following components: 28 parts of dicyclohexylbenzene, 21 parts of biphenyl derivative, 10 parts of antioxidant composite, 6 parts of heat stability aid, 3 parts of dispersant, 2 parts of anti-corrosion additive, 0.8 part of surface activity regulator and 0.5 part of nano-functional filler.

[0052] Preferably, the antioxidant composite is obtained by compounding hydroquinone, tert-butyl hydroquinone, phosphite and thiodipropionate in a weight ratio of 4:2.5:1.2:1.5.

[0053] Preferably, the heat stability aid is obtained by compounding polysiloxane, organic molybdenum compound and borate in a weight ratio of 2.5:1.2:0.8.

[0054] Preferably, the dispersant is obtained by compounding polyisobutylene succinimide and polyetheramine in a weight ratio of 2:1.

[0055] Preferably, the nano-functional filler is composed of alumina and silicon nitride with a particle size of 20-50 nm and is mixed in a weight ratio of 1.5:1.

[0056] Preferably, the surface activity regulator is obtained by compounding polyethylene glycol and glycerol fatty acid ester in a weight ratio of 1.2:0.7.

[0057] Preferably, the biphenyl derivative is composed of cyclohexylbiphenyl and methylbiphenyl in a weight ratio of 2:1.

[0058] The present invention also provides a preparation method of a high-temperature resistant synthetic aromatic heat transfer oil, and the preparation method is carried out with reference to Example 1.

[0059] Experimental Example 1

[0060] Taking the heat transfer oils prepared in Example 1, Example 2 and Example 3 of the present invention as samples, and dividing them into Example 1 group - Example 3 group, and using the commonly used aromatic heat transfer oil on the market as the control group; using a thermal conductivity measuring instrument, respectively measuring the thermal conductivities of the heat transfer oils in Example 1 - Example 3 group and the control group at different temperatures (100 °C, 200 °C, 300 °C), recording the data and conducting comparative analysis.

[0061] Result analysis: As Figure 1As shown, at different temperatures, the thermal conductivity coefficients of the groups of Examples 1-3 are all higher than those of the control group, and among them, the group of Example 3 has the highest thermal conductivity coefficient.

[0062] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

[0063] The above describes the present invention and its embodiments, and this description is not restrictive. What is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and design similar structural modes and embodiments without creative efforts without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A high-temperature resistant synthetic aromatic heat transfer oil, characterized in that: The high-temperature resistant synthetic aromatic heat transfer oil comprises the following components: 20-35 parts of dicyclohexylbenzene, 15-30 parts of biphenyl derivative, 5-15 parts of antioxidant complex, 3-10 parts of heat stability aid, 1-7 parts of dispersant, 1-5 parts of anti-corrosion additive, 0.2-1.8 parts of surface activity regulator and 0.1-1.2 parts of nano-functional filler.

2. The high-temperature resistant synthetic aromatic heat transfer oil according to claim 1, characterized in that: The high-temperature resistant synthetic aromatic heat transfer oil comprises the following components: 25-30 parts of dicyclohexylbenzene, 18-24 parts of biphenyl derivative, 7-12 parts of antioxidant complex, 4-8 parts of heat stability aid, 2-5 parts of dispersant, 1-3 parts of anti-corrosion additive, 0.5-1.5 parts of surface activity regulator and 0.1-0.8 parts of nano-functional filler.

3. The high-temperature resistant synthetic aromatic heat transfer oil according to claim 2, wherein: The antioxidant complex is prepared by compounding hydroquinone, tert-butylhydroquinone, phosphite and thiodipropionate in a weight ratio of (3.0-4.0):(1.5-2.5):(0.8-1.2):(1.0-1.5).

4. A high-temperature resistant synthetic aromatic heat transfer oil according to claim 3, characterized in that: The heat stability aid is prepared by compounding polysiloxane, organic molybdenum compound and borate in a weight ratio of (2.0-3.0):(1.0-1.5):(0.5-1.0).

5. A high-temperature resistant synthetic aromatic heat transfer oil according to claim 4, characterized in that: The dispersant is prepared by compounding polyisobutylene succinimide and polyetheramine in a weight ratio of (1.5-2.5):(0.8-1.2).

6. The high-temperature resistant synthetic aromatic heat transfer oil according to claim 5, wherein: The nano-functional filler is formed by mixing alumina with a particle size of 20-50 nm and silicon nitride in a weight ratio of (1.2-1.8):

1.

7. The heat-resistant synthetic aromatic heat transfer oil according to claim 6, characterized in that: The surface activity regulator is prepared by compounding polyethylene glycol and glycerol fatty acid ester in a weight ratio of (1.0-1.5):(0.5-0.8).

8. A high-temperature resistant synthetic aromatic heat transfer oil according to claim 7, characterized in that: The biphenyl derivative is composed of cyclohexylbiphenyl and methylbiphenyl in a weight ratio of (1.5-2.5):(0.8-1.2).

9. A preparation method of the high-temperature resistant synthetic aromatic heat transfer oil according to claim 8, characterized in that: The preparation method comprises the following steps: (1) Ultrasonically stirring and mixing dicyclohexylbenzene, biphenyl derivative and antioxidant complex to obtain a first mixed solution; (2) Shearing, homogenizing and emulsifying the first mixed solution with heat stability aid and dispersant, and then performing freezing treatment to obtain a second mixed solution; (3) Adding anti-corrosion additive, surface activity regulator and nano-functional filler to the second mixed solution and stirring and mixing to obtain the high-temperature resistant synthetic aromatic heat transfer oil.

10. The preparation method of a high-temperature resistant synthetic aromatic heat transfer oil according to claim 9, characterized in that: The working condition parameters of the ultrasonic stirring and mixing in the step (1) include: ultrasonic power of 400-500 W, stirring time of 20-30 minutes, and stirring speed of 400-600 rpm.

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