High-temperature-resistant heat-conducting oil and preparation method thereof

Abstract

The application relates to the field of heat-conducting oil, and discloses a high-temperature-resistant heat-conducting oil and a preparation method thereof. The high-temperature-resistant heat-conducting oil is prepared from the following raw materials in percentage by weight: base oil 5-10%, composite ester 62-75%, high-temperature-resistant agent 5-10%, emulsifier 8-12%, cleaning dispersant 4-8%, antioxidant 1.8-2.7%, and defoaming agent 0.1-0.3%; the composite ester is composed of pentaerythritol tetraoleate, trimethylolpropane oleate and castor oil acid polyester compound; and the cleaning dispersant is composed of polyethylene glycol monododecyl ether and dodecyl benzene sulfonic acid triethanolamine salt. The heat-conducting oil has high heat transfer efficiency and high-temperature stability, is not prone to carbon deposition under long-term high-temperature conditions, has excellent lubricating and cooling performance, and is suitable for heat transfer systems which need long-term high-temperature operation, such as industrial boilers, die-casting dies and the like.

Description

Technical Field

[0001] This application relates to the field of heat transfer oils, and more specifically, to a high-temperature resistant heat transfer oil and its preparation method. Background Technology

[0002] High-temperature resistant heat transfer oil possesses excellent thermal stability and is not prone to deterioration or coking even after prolonged high-temperature operation. It also exhibits excellent fluidity, ensuring rapid and uniform heat transfer. With good safety and reliability, it guarantees efficient heat transfer while contributing to the stable operation of related equipment, making it an indispensable high-quality heat transfer medium in many high-temperature heat transfer processes. It can meet the needs of various industrial scenarios requiring high-temperature heat transfer, such as industrial boilers and die-casting molds.

[0003] Currently, commonly used high-temperature heat transfer oils are composed of base oil, emulsifier, high-temperature resistant agent, and antioxidant. The high-temperature resistant agent is generally a substance containing aromatic groups, such as hydrogenated terphenyl, terphenyl, hydrogenated tetraphenyl, and hydrogenated pentphenyl, which gives the heat transfer oil excellent high-temperature resistance.

[0004] However, the addition of this type of high-temperature resistant agent can easily cause carbon buildup in the heat transfer oil when used in a long-term high-temperature environment, thereby reducing the long-term thermal stability of the heat transfer oil. Summary of the Invention

[0005] To address the problem that existing heat transfer oils cannot adequately balance thermal conductivity stability and anti-carbon deposit performance when used in long-term high-temperature environments, thus reducing their high-temperature resistance, this application provides a high-temperature resistant heat transfer oil and its preparation method.

[0006] In a first aspect, this application provides a high-temperature resistant heat transfer oil, employing the following technical solution:

[0007] A high-temperature resistant heat transfer oil is prepared from the following raw materials by weight percentage:

[0008] Base oil 5-10%

[0009] Complex ester 62-75%

[0010] High-temperature resistant agent 5-10%

[0011] Emulsifier 8-12%

[0012] 4-8% detergent dispersant

[0013] Antioxidant 1.8-2.7%

[0014] Defoamer 0.1-0.3%;

[0015] The composite ester is composed of pentaerythritol tetraoleate, trimethylolpropane oleate and ricinoleic acid polyester compound;

[0016] The cleaning and dispersing agent is composed of polyethylene glycol monododecyl ether and triethanolamine dodecylbenzenesulfonic acid salt.

[0017] By adopting the above technical solution, the base oil provides the basic carrier for the heat transfer oil; the composite ester, composed of pentaerythritol tetraoleate, trimethylolpropane oleate, and castor oil polyester compound, enhances the stability and lubricity of the heat transfer oil; the high-temperature resistant agent enables the heat transfer oil to have high-temperature resistance; the emulsifier allows the components to mix better; the detergent-dispersant, composed of polyethylene glycol monododecyl ether and triethanolamine dodecylbenzenesulfonate, prevents impurities from accumulating and depositing; the antioxidant delays the oxidative deterioration of the heat transfer oil; and the defoamer eliminates foam generated during heat transfer. The composite ester, high-temperature resistant agent, and detergent-dispersant work synergistically to enhance the stability of the heat transfer oil at high temperatures, reduce carbon buildup, and ensure heat transfer efficiency. This heat transfer oil has high heat transfer efficiency, high-temperature stability, is not prone to carbon buildup during long-term high-temperature use, and has excellent lubrication and cooling performance, making it suitable for heat transfer systems requiring long-term high-temperature operation, such as industrial boilers and die-casting molds.

[0018] Preferably, the composite ester is composed of pentaerythritol tetraoleate, trimethylolpropane oleate and castor oil polyester compound in a weight ratio of 1:(0.5-1):(1-2).

[0019] By adopting the above technical solution, pentaerythritol tetraoleate exhibits good lubricity and low-temperature fluidity, reducing the friction coefficient of heat transfer oil and improving the smoothness of equipment operation; trimethylolpropane oleate has a high flash point and low volatility, enhancing the safety and high-temperature stability of heat transfer oil; castor oil polyester compound has good polarity and adhesion, helping to improve the adsorption capacity of heat transfer oil on metal surfaces. These three raw materials combine to form a composite ester, which works synergistically to impart excellent fluidity to the heat transfer oil while improving its adhesion properties. When the composite ester prepared by combining the three raw materials in an optimal weight ratio is used in heat transfer oil, it enables the heat transfer oil to maintain good fluidity and lubricity at high temperatures, reduces carbon buildup, and improves the long-term thermal stability and service life of the heat transfer oil, making it suitable for heat transfer systems requiring long-term high-temperature operation.

[0020] Preferably, the ricinoleic acid polyester compound is tetrameric ricinoleate and / or hexameric ricinoleate.

[0021] By adopting the above technical solution, tetrameric ricinoleate and / or hexameric ricinoleate, as components of the composite ester, help to enhance the thermal stability of the heat transfer oil, making it less prone to deterioration during long-term high-temperature operation; it can also improve the fluidity of the heat transfer oil, ensuring that heat can be transferred more quickly and evenly, thereby improving the heat transfer efficiency of the heat transfer oil, making it less prone to carbon buildup when used under long-term high-temperature conditions, and ensuring the long-term thermal stability of the heat transfer oil.

[0022] Preferably, the detergent dispersant is composed of polyethylene glycol monododecyl ether and triethanolamine dodecylbenzenesulfonate in a weight ratio of 1:(2-3).

[0023] By adopting the above technical solution, polyethylene glycol monododecyl ether and triethanolamine dodecylbenzenesulfonate in a better weight ratio are used as detergents and dispersants in high-temperature heat transfer oil. The two work synergistically. Polyethylene glycol monododecyl ether can effectively disperse impurities and contaminants in the oil and prevent them from agglomerating and settling. Triethanolamine dodecylbenzenesulfonate can neutralize the acidic substances produced by oil oxidation, inhibit carbon deposit formation, improve the detergent properties of heat transfer oil, and ensure that the heat transfer oil still has high thermal stability when used under high temperature conditions for a long time, thus reducing the occurrence of carbon deposits.

[0024] Preferably, the base oil is composed of palm oil and naphthenic oil in a weight ratio of 1:(3-4).

[0025] By adopting the above technical solution, using palm oil and naphthenic oil in a relatively optimal weight ratio as base oils, the synergistic effect of the two can effectively improve the overall performance of the heat transfer oil. Palm oil has a certain degree of lubricity, while naphthenic oil has good high-temperature fluidity and chemical stability. The combination of the two can make the heat transfer oil have both lubricity and high-temperature fluidity, and also help maintain the chemical stability of the heat transfer oil under high-temperature environments, thereby improving the high-temperature stability of the heat transfer oil.

[0026] Preferably, the high-temperature resistant agent is composed of triphenyl thiophosphate and polyisobutylene succinic anhydride in a weight ratio of 1:(2-3).

[0027] By adopting the above technical solution, triphenyl thiophosphate exhibits excellent high-temperature resistance, effectively improving the thermal stability of heat transfer oil under high-temperature environments. Polyisobutylene succinic anhydride acts as a cleaner and dispersant, preventing carbon buildup in the heat transfer oil during long-term high-temperature use and ensuring its long-term thermal stability. The two components, combined in an optimal weight ratio, form a high-temperature resistant agent, exerting a synergistic effect. This not only enhances the high-temperature resistance of the heat transfer oil but also avoids high-temperature carbon buildup, resulting in high heat transfer efficiency and high-temperature stability.

[0028] Preferably, the emulsifier is composed of polyglycerol-3 polyricinoleate, polyethylene glycol monooleate and cetearyl alcohol polyether-6 in a weight ratio of (1-2):1:(0.2-0.5).

[0029] By adopting the above technical solution, polyglycerol-3 polyricinoleate exhibits excellent emulsifying and dispersing properties, enabling better and more uniform mixing of the components in the heat transfer oil and preventing stratification; polyethylene glycol monooleate possesses certain lubricating and solubilizing properties, improving the fluidity and solubility of the heat transfer oil; and cetearyl alcohol polyether-6 helps enhance the stability of the emulsion system. These three raw materials, combined in a specific weight ratio as emulsifiers, produce a synergistic effect, further improving the emulsification effect and stability of the heat transfer oil, resulting in superior overall performance, improved long-term performance, reduced carbon buildup, and ensuring long-term stable operation and high-efficiency heat transfer performance under high-temperature environments.

[0030] Preferably, the antioxidant is 2,6-di-tert-butyl-p-cresol and / or N-phenyl-α-naphthylamine.

[0031] By adopting the above technical solution, using 2,6-di-tert-butyl-p-cresol and / or N-phenyl-α-naphthylamine as antioxidants, the antioxidant capacity of high-temperature heat transfer oil under long-term high-temperature environment can be effectively improved, the risk of oxidation and deterioration of heat transfer oil can be reduced, and the heat transfer oil can maintain good performance even when used under high-temperature conditions for a long time, and is not prone to carbon buildup, thereby improving the long-term thermal stability of heat transfer oil and ensuring its heat transfer efficiency.

[0032] Preferably, the defoamer is a polyether-modified silicone defoamer.

[0033] By adopting the above technical solution, adding polyether-modified silicone defoamer to the heat transfer oil can effectively eliminate the foam generated during the use of the heat transfer oil, improve the continuity and uniformity of the heat transfer oil flow, and ensure that the heat transfer oil can continuously and efficiently conduct heat transfer under high temperature conditions.

[0034] Secondly, this application provides a method for preparing a high-temperature resistant heat transfer oil, which adopts the following technical solution: A method for preparing a high-temperature resistant heat transfer oil includes the following steps: mixing base oil, composite ester, detergent dispersant and emulsifier evenly, adding high-temperature resistant agent, antioxidant and defoamer, stirring and dispersing to obtain a high-temperature resistant heat transfer oil.

[0035] By adopting the above technical solution, the base oil, compound ester, detergent dispersant and emulsifier are first mixed evenly, and then high temperature resistant agent, antioxidant and defoamer are added and stirred and dispersed to prepare heat transfer oil. The preparation method can ensure that the components are fully mixed evenly and obtain a stable heat transfer oil system.

[0036] In summary, this application includes at least one of the following beneficial technical effects:

[0037] 1. The high-temperature resistant heat transfer oil of this application is prepared from base oil, composite ester, high-temperature resistant agent, emulsifier, detergent-dispersant, antioxidant, and defoamer, exhibiting high heat transfer efficiency and high-temperature stability. The composite ester is composed of pentaerythritol tetraoleate, trimethylolpropane oleate, and castor oil polyester compound, which improves the fluidity of the heat transfer oil and ensures rapid and uniform heat transfer. The detergent-dispersant is composed of polyethylene glycol monododecyl ether and triethanolamine dodecylbenzenesulfonate, which prevents carbon buildup during long-term use at high temperatures, thus improving the long-term thermal stability of the heat transfer oil. Simultaneously, this heat transfer oil also possesses excellent lubrication and cooling properties, making it suitable for heat transfer systems requiring long-term high-temperature operation, such as industrial boilers and die-casting molds.

[0038] 2. Using triphenyl thiophosphate and polyisobutylene succinic anhydride in a better weight ratio as high-temperature resistant agents can further improve the high-temperature stability of the heat transfer oil.

[0039] 3. Using palm oil and naphthenic oil in a better weight ratio as base oils, the combination of the two can make the heat transfer oil have both lubricity and high-temperature fluidity, and help maintain the chemical stability of the heat transfer oil in high-temperature environments, thereby improving the high-temperature stability of the heat transfer oil. Detailed Implementation

[0040] The present application will be further described in detail below with reference to the embodiments.

[0041] The following are some of the sources and specifications of the raw materials used in this application. The raw materials used in the preparation examples and embodiments of this application can all be obtained commercially, including but not limited to the following models and manufacturers of raw materials. Raw materials with equivalent performance can also be used:

[0042] 1. Pentaerythritol tetraoleate: CAS No. 19321-40-5, PET0, content 99%;

[0043] 2. Trimethylolpropane oleate: CAS No. 57675-44-2, TMPO, purity 99%;

[0044] 3. Polyethylene glycol monododecyl ether: Brand: Hai Shi Hua, content: 99%;

[0045] 4. Triethanolamine dodecylbenzenesulfonate: CAS No. 27323-41-7, purity 99%;

[0046] 5. Tetrameric ricinoleate: Saponification value 188-196 mgKOH / g, content 99%;

[0047] 6. Hexameric ricinoleate: saponification value 180-200 mgKOH / g, content 99%;

[0048] 7. Palm oil: Shenzhen Nanhai Oils & Fats, refined palm oil;

[0049] 8. Naphthenic oil: Naphthenic oil 4010;

[0050] 9. Polyglycerol-3 polyricinoleate: CAS No. 29894-35-7, content 99%;

[0051] 10. Polyethylene glycol monooleate: Yunsheng Chemical PEG400MO;

[0052] 11. Cetearyl alcohol polyether-6: Lambert, 99% purity;

[0053] 12. Polyether-modified silicone defoamer: Evonik TEGO Antifoam 793;

[0054] 13. Polyisobutylene succinic anhydride: CAS No. 67762-77-0, molecular weight 1000;

[0055] 14. Polyisobutylene succinimide: Bobst, model T-155, content 99%.

[0056] Example

[0057] Example 1

[0058] Example 1 discloses a high-temperature resistant heat transfer oil, prepared by the following steps: 0.5 kg of base oil (composed of white oil 26# and naphthenic oil 4010 in a weight ratio of 1:2), 7.1 kg of composite ester (composed of pentaerythritol tetraoleate, trimethylolpropane oleate and hexameric ricinoleate in a weight ratio of 1:0.5:1), 0.4 kg of detergent-dispersant (composed of polyethylene glycol monododecyl ether and triethanolamine dodecylbenzenesulfonate in a weight ratio of 1:1), and 0.8 kg of emulsifier (composed of polyethylene glycol monooleate and polyglycerol-3 polyricinoleate in a weight ratio of 2:1) are uniformly dispersed for 30 min at a mixing rate of 800 r / min. Then, 1 kg of high-temperature resistant agent (composed of triphenyl thiophosphate and polyisobutylene succinimide in a weight ratio of 1:2) and 0.19 kg of other components are added. High-temperature heat transfer oil was prepared by uniformly dispersing 2,6-di-tert-butyl-p-cresol as an antioxidant and 0.01 kg of polyether-modified silicone defoamer for 20 min at a mixing rate of 800 r / min.

[0059] Example 2

[0060] The difference between Examples 2-3 and Example 1 lies in the amount of raw materials used and the preparation conditions, as detailed in Table 1 below.

[0061] Table 1 Parameter table for Examples 1-3

[0062]

[0063]

[0064] Example 4

[0065] The difference between Example 4 and Example 1 is that the proportion of detergent dispersant is different. In Example 4, the weight ratio of polyethylene glycol monododecyl ether and triethanolamine dodecylbenzenesulfonate is 1:2, while the rest is the same as in Example 1.

[0066] Example 5

[0067] The difference between Example 5 and Example 1 is that the weight ratio of polyethylene glycol monododecyl ether and triethanolamine dodecylbenzenesulfonate is 1:3, while the rest is the same as in Example 1.

[0068] Example 6

[0069] The difference between Example 6 and Example 5 is that the type and ratio of emulsifier are different. The emulsifier in Example 6 is composed of polyglycerol-3 polyricinoleate, polyethylene glycol monooleate and cetearyl alcohol polyether-6 in a weight ratio of 1:1:0.2. The rest is the same as in Example 5.

[0070] Example 7

[0071] The difference between Example 7 and Example 5 is that the emulsifier is composed of polyglycerol-3 polyricinoleate, polyethylene glycol monooleate and cetearyl alcohol polyether-6 in a weight ratio of 2:1:0.5, while the rest is the same as in Example 5.

[0072] Example 8

[0073] The difference between Example 8 and Example 7 is that the base oil is different. The base oil in Example 8 is composed of palm oil and naphthenic oil 4010 in a weight ratio of 1:3. Everything else is the same as in Example 7.

[0074] Example 9

[0075] The difference between Example 9 and Example 7 is that the base oil is composed of palm oil and naphthenic oil 4010 in a weight ratio of 1:4, while the rest is the same as in Example 7.

[0076] Example 10

[0077] The difference between Example 10 and Example 8 is that the high-temperature resistant agent is composed of triphenyl thiophosphate and polyisobutylene succinic anhydride in a weight ratio of 1:2, while the rest is the same as in Example 8.

[0078] Example 11

[0079] The difference between Example 11 and Example 8 is that the high-temperature resistant agent is composed of triphenyl thiophosphate and polyisobutylene succinic anhydride in a weight ratio of 1:3, while the rest is the same as in Example 8.

[0080] Comparative Example

[0081] Comparative Example 1

[0082] The difference between Comparative Example 1 and Example 1 is that the hexameric ricinoleate in the composite ester is replaced with an equal amount of pentaerythritol tetraoleate, otherwise it is the same as Example 1.

[0083] Comparative Example 2

[0084] The difference between Comparative Example 2 and Example 1 is that pentaerythritol tetraoleate in the composite ester is replaced with hexameric castor oil oleate in equal amounts, while the rest is the same as in Example 1.

[0085] Comparative Example 3

[0086] The difference between Comparative Example 3 and Example 1 is that triethanolamine dodecylbenzenesulfonate salt was replaced with polyethylene glycol monododecyl ether in equal amounts, while the rest is the same as Example 1.

[0087] Comparative Example 4

[0088] The difference between Comparative Example 4 and Example 1 is that the amount of detergent dispersant used is 0.1 kg and the amount of compound ester used is 7.4 kg, while the rest is the same as in Example 1.

[0089] Performance testing

[0090] The performance of the high-temperature heat transfer oils prepared in Examples 1-11 and Comparative Examples 1-4 was tested below:

[0091] 1. Thermal conductivity test

[0092] The thermal conductivity (unit: W / (m·K)) of the heat transfer oil was tested at 300°C according to the test method in ASTM D7896-19, and the test results were recorded.

[0093] 2. High temperature stability

[0094] Using an organic heat transfer fluid thermal stability tester, referring to GB / T 23800-2009, the heat transfer oil was tested for 720 hours at a temperature of 300℃. The deterioration rate (unit: %) of the heat transfer oil was tested and the test results were recorded.

[0095] 3. Carbon residue test

[0096] The carbon residue rate of the heat transfer oil was tested according to the test method in GB / T 268, and the test results were recorded.

[0097] The following are the performance test data of the high-temperature heat transfer oils of Examples 1-11 and Comparative Examples 1-4, as detailed in Table 2 below.

[0098] Table 2 Performance data of Examples 1-11 and Comparative Examples 1-4

[0099]

[0100]

[0101] Based on Examples 1-3, Examples 4-5, and Comparative Examples 1-4, and in conjunction with Table 2, it can be concluded that in Examples 4-5, the proportion of the detergent-dispersant was further optimized, resulting in improved thermal conductivity, reduced degradation rate, and reduced carbon residue of the heat transfer oil. In Comparative Example 3, the type of detergent-dispersant was changed, resulting in a significant decrease in thermal conductivity, an increase in degradation rate, and an increase in carbon residue of the heat transfer oil. In Comparative Examples 1-2, the type and proportion of the composite ester were changed, resulting in a significant decrease in thermal conductivity, an increase in degradation rate, and an increase in carbon residue of the heat transfer oil. In Comparative Example 4, the amount of detergent-dispersant was reduced, while the amount of composite ester was increased. Although the thermal conductivity of the heat transfer oil did not change significantly, both the degradation rate and carbon residue were significantly improved. Therefore, it can be concluded that the preferred detergent-dispersant and composite ester of this application have a good synergistic effect, and the resulting heat transfer oil exhibits good thermal conductivity, high-temperature stability, and anti-carbon deposition properties.

[0102] Compared to Example 5, Examples 6-7 further optimized the type and ratio of emulsifier, resulting in improved thermal conductivity, reduced degradation rate, and reduced carbon residue of the heat transfer oil. This indicates that the emulsifier of this application can improve the emulsification stability of the heat transfer oil, thereby improving its high-temperature stability and anti-carbon deposition performance.

[0103] Compared with Example 7, Examples 8-9 further optimized the type and ratio of base oil, resulting in improved thermal conductivity, reduced degradation rate, and reduced carbon residue of the heat transfer oil.

[0104] Compared with Example 8, Examples 10-11 further optimized the type and proportion of high-temperature resistant agent, and the thermal conductivity of the heat transfer oil was significantly improved, while the degradation rate and carbon residue rate were significantly reduced. This shows that the high-temperature resistant agent of this application can further improve the high-temperature stability of the heat transfer oil in the system.

[0105] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high temperature resistant heat transfer oil, characterized by: The base oil 5-10%, the complex ester 62-75%, the high temperature resistant agent 5-10%, the emulsifier 8-12%, the cleaning dispersant 4-8%, the antioxidant 1.8-2.7%, and the defoaming agent 0.1-0.3% are prepared by the following weight percentage of raw materials: The base oil 5-10%, the complex ester 62-75%, the high temperature resistant agent 5-10%, the emulsifier 8-12%, the cleaning dispersant 4-8%, the antioxidant 1.8-2.7%, and the defoaming agent 0.1-0.3% are prepared by the following weight percentage of raw materials: The complex ester is composed of pentaerythritol tetraoleate, trimethylolpropane oleate and ricinoleic acid polyester compound; The base oil is composed of palm oil and naphthenic oil in a weight ratio of 1: (3-4); the high temperature resistant agent is composed of triphenyl phosphate and polyisobutylene succinic anhydride in a weight ratio of 1: (2-3); the emulsifier is composed of polyglyceryl-3 polyricinoleate, polyethylene glycol monooleate and ceteareth-6 in a weight ratio of (1-2): 1: (0.2-0.5). The complex ester is composed of pentaerythritol tetraoleate, trimethylolpropane oleate and ricinoleic acid polyester compound in a weight ratio of 1: (0.5-1): (1-2). The ricinoleic acid polyester compound is tetra-ricinoleic acid ester and / or hexa-ricinoleic acid ester. The cleaning dispersant is composed of polyethylene glycol monododecyl ether and triethanolamine dodecylbenzenesulfonate in a weight ratio of 1: (2-3). The antioxidant is 2,6-di-tert-butyl-p-cresol and / or N-phenyl-α-naphthylamine. The defoaming agent is a polyether-modified silicone defoaming agent. The steps include: The base oil, the complex ester, the cleaning dispersant and the emulsifier are mixed uniformly, the high temperature resistant agent, the antioxidant and the defoaming agent are added, and stirring and dispersion are performed to prepare the high temperature resistant heat conducting oil.

2. The high-temperature resistant heat conducting oil according to claim 1, characterized in that: ​ 3. The high-temperature resistant heat transfer oil according to claim 2, characterized in that: ​ 4. The high temperature resistant heat transfer oil according to claim 1, characterized in that: ​ 5. The high temperature resistant heat transfer oil according to claim 1, wherein: ​ 6. The high temperature resistant heat transfer oil according to claim 1, wherein: ​ 7. A method for preparing a high-temperature resistant heat transfer oil as described in any one of claims 1-6, characterized in that: ​ ​

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