High-temperature-resistant and anti-coking synthetic ester type chain oil as well as preparation method and application thereof
By using a compound of dipentaerythritol ester and trimellitate ester with specific parameters as the base oil, and adding extreme pressure anti-wear agents, antioxidants, and rust inhibitors, the problem of chain oil being prone to coking and oil film rupture at high temperatures is solved, achieving stable lubrication and low wear at high temperatures.
Patent Information
- Application Number
- CN202610004899.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-05
- Publication Date
- 2026-05-08
AI Technical Summary
Existing chain oils are prone to oxidation and coking at high temperatures, resulting in evaporation loss and oil film rupture. They are also difficult to balance permeability and adhesion, leading to chain jamming, increased wear, and even motor burnout.
Using dipentaerythritol ester and trimellitate with specific parameters as synthetic ester base oils, and compounded with extreme pressure anti-wear agents, antioxidants, and rust inhibitors, a stable and durable oil film is formed through the synergistic effect between the components, improving high-temperature stability and lubrication performance.
It exhibits no tendency to coke at 300℃, strong adhesion, low evaporation loss, low coefficient of friction, extended lubrication cycle, reduced wear and transmission resistance, and is suitable for lubrication of transmission chains in high-temperature industrial equipment.
Smart Images
Figure CN121991750A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of chain lubricant technology, and more specifically, relates to a high-temperature resistant and anti-coking synthetic ester-type chain oil, its preparation method and application. Background Technology
[0002] In industries such as textile printing and dyeing, metallurgy, glass manufacturing, ceramic sintering, and food baking, conveyor chains, oven chains, and kiln car chains are subjected to extreme environments of high temperature, dust, and chemical corrosion. Their operating temperatures typically exceed 200℃, and in some areas can even reach 300℃. Under these harsh conditions, existing chain oils generally face problems such as oxidation and coking, high-temperature volatilization, and lubricant film rupture, easily leading to chain jamming, increased transmission resistance, accelerated wear, and even seizure. In severe cases, this can cause electrode overload and burnout. Furthermore, existing chain oils exhibit poor adhesion at high temperatures, easily causing oil dripping, while excessively strong penetration makes it difficult to form a durable oil film on the chain surface, making it difficult to achieve an effective balance between rapid penetration and long-term adhesion.
[0003] To improve the viscosity and adhesion of chain chain oils, traditional methods often involve blending mineral oil with thickeners such as asphalt and soap bases. However, this formulation exhibits poor stability at high temperatures, with significant issues of coking and carbon buildup. With the development of synthetic lubrication technology, synthetic base oils such as polyalphaolefins, ester oils, and polyethers have gradually replaced mineral oils, significantly improving the high-temperature performance of chain chain oils. However, commonly used synthetic ester-based chain chain oils typically require the addition of viscosity index improvers such as polyisobutylene and polymethacrylates to balance penetration and adhesion. These additives are less volatile at high temperatures, tending to accumulate on the chain surface, forming coke and gum deposits that hinder chain transmission, thus failing to meet the long-term lubrication requirements under sustained high-temperature environments.
[0004] Therefore, there is an urgent need to develop a synthetic ester-type chain oil that can effectively lubricate at high temperatures of 300℃, has good oil film retention capabilities, and has a low tendency to coke. Summary of the Invention
[0005] In view of the shortcomings of the prior art, the purpose of this application is to provide a high-temperature resistant and anti-coking synthetic ester-type chain oil, its preparation method and application, which aims to solve the problems of oxidation and coking, evaporation loss, oil film rupture and difficulty in balancing permeability and adhesion of existing chain oils at high temperatures, which can easily lead to chain jamming, abnormal wear and even motor burnout.
[0006] To achieve the above objectives, in a first aspect, this application provides a high-temperature resistant and coking-resistant synthetic ester-type chain oil, which is composed of synthetic ester base oil, extreme pressure anti-wear agent, antioxidant and rust inhibitor; The above-mentioned synthetic ester base oil is composed of dipentaerythritol ester and trimellitate; wherein, the hydroxyl value of the above-mentioned dipentaerythritol ester is less than 10 mg KOH / g, the aniline point is less than 100°C, and it is prepared by direct esterification reaction of dipentaerythritol with C5~C10 fatty acids under the action of acidic catalyst at 180°C~250°C; the alkyl chain carbon number of the above-mentioned trimellitate is C8~C12. The synthetic ester base oil has a mass percentage of 90% to 99% in the chain oil, and the mass ratio of the dipentaerythritol ester to the trimellitate is (0.5 to 6):1.
[0007] Preferably, the synthetic ester-type chain oil is composed of the following components by weight: 94 to 99 parts synthetic ester base oil, 1 to 4 parts extreme pressure anti-wear agent, 0.2 to 2 parts antioxidant, and 0.05 to 2 parts rust inhibitor.
[0008] Preferably, the mass ratio of the above-mentioned pentaerythritol ester and trimellitate is (40~85):(14~60).
[0009] Preferably, the above-mentioned extreme pressure anti-wear agent is a phosphorus-based extreme pressure anti-wear agent, selected from one or more of alkyl phosphites, phosphate esters, and ammonium salts of thiophosphate esters.
[0010] Preferably, the antioxidant is an amine antioxidant and / or a phenolic antioxidant.
[0011] Preferably, the weight ratio of the above-mentioned amine antioxidant to the above-mentioned phenolic antioxidant is (1.2~3):1.
[0012] Preferably, the rust inhibitor is selected from one or more of dibutylmethylene ester, olefinic succinic acid monoester, phosphate ester, amide, and benzotriazole derivative.
[0013] Secondly, this application provides a method for preparing the above-mentioned synthetic ester-type chain oil, comprising the following steps: The synthetic ester base oil was mixed with anti-wear agent, antioxidant and rust inhibitor under heating conditions according to the formula to prepare the synthetic ester chain oil.
[0014] Preferably, the heating temperature is 90℃~100℃.
[0015] Thirdly, this application provides an application of the above-mentioned synthetic ester-type chain oil in the lubrication of transmission chains in high-temperature industrial equipment.
[0016] Fourthly, this application provides a chain lubricant suitable for textile heat setting machines, which includes the above-mentioned synthetic ester-type chain oil.
[0017] In summary, the technical solutions conceived in this application have the following main technical advantages compared with the prior art: (1) The synthetic ester-type chain oil provided in this application, without the addition of viscosity index improvers, uses dipentapentapentanol ester with specific parameters and trimellitate as synthetic ester base oil, and then combines extreme pressure anti-wear agents, antioxidants, rust inhibitors and other components. Through the intrinsic synergistic effect between the components, the oil has suitable adhesion and low evaporation loss (viscosity index of 105~120, kinematic viscosity at 40℃ not less than 320 mm). 2 (with an evaporation loss of less than 10 wt%), it can still adhere to the chain surface and maintain good lubrication even at high temperatures. Furthermore, compared to chain oils using viscosity index improvers, the synthetic ester-type chain oil provided in this application shows no tendency to coke at high temperatures of 210℃~300℃, exhibiting excellent high-temperature stability and meeting the long-term lubrication requirements under continuous high-temperature environments.
[0018] (2) The synthetic ester-type chain oil provided in this application can improve the anti-wear and wear resistance of the oil and its corrosion resistance to metals by adjusting the ratio between the synthetic ester base oil and the extreme pressure anti-wear agent, antioxidant and rust inhibitor components. It can also improve the stability of the oil and avoid the oil stratification caused by poor system compatibility. In actual use, it helps to form a stable and durable oil film on the chain surface. Attached Figure Description
[0019] Figure 1 The coking performance of the synthetic ester-type chain oils prepared in Examples 1-4 of this application and the chain oil of Comparative Example 1 is shown after coking performance testing. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0021] In the description of this application, it should be understood that the term "and / or" describes a relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The symbol " / " in this document indicates that the related objects are in an "or" relationship; for example, A / B means A or B.
[0022] In the description of the embodiments in this application, the words "exemplary" or "for example" are used to indicate that they are examples, illustrations, or descriptions. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design options. Specifically, the use of the words "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.
[0023] In the description of the embodiments in this application, unless otherwise stated, "multiple" means two or more.
[0024] This application provides a high-temperature resistant and coking-resistant synthetic ester-type chain oil, which is composed of synthetic ester base oil, extreme pressure anti-wear agent, antioxidant and rust inhibitor; The above-mentioned synthetic ester base oil is composed of dipentaerythritol ester and trimellitate; wherein, the hydroxyl value of the above-mentioned dipentaerythritol ester is less than 10 mg KOH / g, the aniline point is less than 100°C, and it is prepared by direct esterification reaction of dipentaerythritol with C5~C10 fatty acids under the action of acidic catalyst at 180°C~250°C; the alkyl chain carbon number of the above-mentioned trimellitate is C8~C12. The above-mentioned synthetic ester base oil has a mass percentage of 90%~99% in the chain oil, and the mass ratio of the above-mentioned dipentaerythritol ester to the above-mentioned trimellitic acid ester is (0.5~6):1.
[0025] Through experiments, the inventors discovered that using a highly polar dipentaerythritol ester (hydroxyl value less than 10 mg KOH / g, aniline point below 100°C) and a trimellitate ester with C8-C12 alkyl chains as a synthetic ester base oil, and controlling its total mass percentage in the chain oil to be 90%-99%, results in a base oil system with superior viscosity properties. This system can firmly adhere to metal surfaces, forming a stable and durable oil film on the chain surface. Furthermore, the strong binding force between this blended base oil and extreme pressure anti-wear agents not only reduces the oil's coefficient of friction, making it particularly suitable for high-load, low-speed chain drive systems, but also significantly improves the overall stability of the formulation system, effectively preventing oil turbidity or stratification caused by poor system compatibility. In addition, this blended base oil imparts outstanding lubrication performance, high-temperature resistance, anti-migration properties, and low evaporation loss to the oil, thereby synergistically achieving a comprehensive improvement in the chain oil's lubrication performance and high-temperature durability. When the proportion of highly polar dipentaerythritol in synthetic ester base oils is too high, the oil exhibits excessive adhesion, poor low-temperature permeability, and difficulty in quickly lubricating the internal hinges of chains. Furthermore, it is more prone to oxidation and coking at high temperatures. Conversely, when the proportion of trimellitate in synthetic ester base oils is too high, it weakens the overall polarity of the base oil system, leading to a significant decrease in its adsorption capacity to metal surfaces and oil film strength. Under high temperature and high load conditions, this makes the lubricating film more susceptible to rupture, exacerbating wear. It also reduces the stability of its combination with additives such as extreme pressure anti-wear agents.
[0026] In some embodiments, the above-mentioned synthetic ester-type chain oil, by weight, comprises the following components: 94 to 99 parts of synthetic ester base oil, 1 to 4 parts of extreme pressure anti-wear agent, 0.2 to 2 parts of antioxidant, and 0.05 to 2 parts of rust inhibitor. The mass ratio of dipentaerythritol ester to trimellitate is (40 to 85):(14 to 60). The inventors discovered through experiments that when the mass percentage of synthetic ester base oil in the synthetic ester-type chain oil is too low, the oil's thermal stability deteriorates, leading to increased evaporation loss and a significant tendency to coking at high temperatures. Simultaneously, the oil viscosity decreases, making it difficult to form a stable and durable oil film on the chain surface, thus exacerbating wear and the risk of jamming. If viscosity index improvers are added to maintain adhesion, these polymers are easily degraded and deposited at high temperatures, further exacerbating coking and creating a vicious cycle, failing to meet the stringent requirements of long-term, stable lubrication in continuous high-temperature environments.
[0027] In some embodiments, the hydroxyl value of the above-mentioned pentaerythritol ester is 5-10 mg KOH / g, and the aniline point is 70°C-100°C. In some embodiments, the alkyl chain of the above-mentioned trimellitic ester has C8-C10 carbon atoms and is selected from one or more of trioctyl trimellitate, trinonyl trimellitate, and tridecyl trimellitate.
[0028] In some embodiments, the aforementioned extreme pressure anti-wear agent is a phosphorus-based extreme pressure anti-wear agent, which can synergistically improve the anti-wear and friction-reducing properties of chain oils by synthesizing ester base oils, and has good solubility in synthetic ester systems, making it less prone to precipitation. It is understood that this application does not particularly limit the phosphorus-based extreme pressure anti-wear agent; any phosphorus-based extreme pressure anti-wear agent reported in the prior art can be used, as well as synthetic substances. For example, the aforementioned extreme pressure anti-wear agent can be selected from, but is not limited to, one or more of ammonium phosphate ester extreme pressure anti-wear agents, alkyl phosphite extreme pressure anti-wear agents, phosphate ester extreme pressure anti-wear agents, and ammonium thiophosphate ester extreme pressure anti-wear agents.
[0029] In some embodiments, the antioxidants are amine antioxidants and / or phenolic antioxidants. In some embodiments, the antioxidants include both amine and phenolic antioxidants. The phenolic antioxidants include, but are not limited to, one or more of Basf L135, 2,6-di-tert-butyl-p-methylphenol, and 2,6-di-tert-butyl-mixed phenols. The amine antioxidants include, but are not limited to, one or more of diisooctyl diphenylamine, octylbutyl diphenylamine, phenyl α-naphthylamine, and diisooctyl diphenylamine. In some embodiments, the weight ratio of the amine antioxidant to the phenolic antioxidant is (1.2~3):1.
[0030] In some embodiments, the aforementioned rust inhibitor can undergo a chemical reaction on the metal surface of the chain to form a chemical film, effectively preventing direct contact between the metal and oxygen and moisture, thereby effectively preventing chain corrosion and extending the chain's lifespan. It can be selected from, but is not limited to, one or more of dibutylmethylene ester, olefinic succinic acid monoester, phosphate ester rust inhibitors, amide rust inhibitors, and benzotriazole derivatives.
[0031] On the other hand, this application provides a method for preparing the above-mentioned synthetic ester-type chain oil, comprising the following steps: The synthetic ester base oil was mixed with anti-wear agent, antioxidant and rust inhibitor under heating conditions according to the formula to prepare the synthetic ester chain oil.
[0032] In some embodiments, the heating temperature is 90°C to 100°C. It is understood that this application does not limit the mixing method or time, as long as the components are mixed evenly. In some embodiments, the mixing method may be, but is not limited to, mechanical stirring, magnetic stirring, etc.
[0033] This application also provides the application of the aforementioned synthetic ester-type chain oil in the lubrication of transmission chains in high-temperature industrial equipment. The aforementioned high-temperature industrial equipment can be, but is not limited to, textile heat setting machines, glass furnaces, ceramic kilns, or food baking equipment.
[0034] This application also provides a chain lubricant suitable for textile heat setting machines, which includes the above-mentioned synthetic ester-type chain oil.
[0035] It should be understood that materials of the same or similar type, model, quality, properties, or function as the reagents and instruments used in the following embodiments can be used to implement this application. Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods. Unless otherwise specified, the materials and reagents used in the following embodiments are commercially available.
[0036] The following are examples and comparative examples: Example 1 The components and their mass fractions of the synthetic ester-type chain oil provided in this embodiment are shown in Table 1.
[0037] Table 1. Types and mass fractions of raw materials for the synthetic ester-type chain oil provided in Example 1
[0038] The preparation method of the synthetic ester-type chain oil provided in this embodiment is as follows: Dipentaerythritol ester and trimellitate are mixed according to the formula and heated to 90°C. Then, extreme pressure anti-wear agent, antioxidant and rust inhibitor components are added and stirred until well mixed to obtain yellow transparent synthetic ester-type chain oil.
[0039] Example 2 The synthetic ester-type chain oil provided in this embodiment has the components and their mass fractions shown in Table 2. It was then prepared according to the method provided in Example 1 to obtain a yellow transparent synthetic ester-type chain oil.
[0040] Table 2. Types and mass fractions of raw materials for the synthetic ester-type chain oil provided in Example 2
[0041] Example 3 The synthetic ester-type chain oil provided in this embodiment has the components and their mass fractions shown in Table 3. It was then prepared according to the method provided in Example 1 to obtain a yellow transparent synthetic ester-type chain oil.
[0042] Table 3. Types and mass fractions of raw materials for the synthetic ester-type chain oil provided in Example 3
[0043] Example 4 The synthetic ester-type chain oil provided in this embodiment has the components and their mass fractions shown in Table 4. It was then prepared according to the method provided in Example 1 to obtain a yellow transparent synthetic ester-type chain oil.
[0044] Table 4. Types and mass fractions of raw materials for the synthetic ester-type chain oil provided in Example 4
[0045] Comparative Example 1 Great Wall Company produces chain oil with the grade 518.
[0046] Comparative Example 2 The synthetic ester-type chain oil provided in this comparative example has the same components and mass fractions as in Example 1, except that the trimellitate is trimellitic acid tri(heptanol) ester, and its alkyl chain has 7 carbon atoms. It was then prepared according to the method provided in Example 1 to obtain a yellow, transparent synthetic ester-type chain oil.
[0047] Comparative Example 3 The synthetic ester-type chain oil provided in this comparative example has the same components and mass fractions as in Example 1, except that the hydroxyl value of dipentaerythritol ester is 15 mg KOH / g and the aniline point is 115°C. It was then prepared according to the method provided in Example 1 to obtain a yellow, transparent synthetic ester-type chain oil.
[0048] Comparative Example 4 The components and their mass fractions of the synthetic ester-type chain oil provided in this comparative example are the same as those in Example 1, except that the mass ratio of dipentaerythritol ester to trimellitate is 0.2:1. The oil was then prepared according to the method provided in Example 1 to obtain a yellow, transparent synthetic ester-type chain oil.
[0049] During the preparation process, it was found that the viscosity of this synthetic ester-type chain oil is relatively low. Referring to GB / T 1995, its viscosity index is only 90, making it prone to dripping from the chain in actual production applications, thus failing to meet application requirements. Furthermore, referring to GB / T 3536, its flash point is only 220℃, making it unsuitable for high-temperature environments.
[0050] The synthetic ester-type chain oils prepared in Examples 1-4 and Comparative Examples 2-3, as well as the chain oil of Comparative Example 1, were subjected to performance tests. The test methods are as follows: (1) Pour point: Determined according to GB / T 3535.
[0051] (2) Flash point: Determined according to GB / T 3536.
[0052] (3) Kinematic viscosity: determined according to GB / T 265.
[0053] (4) Viscosity index: determined according to GB / T 1995.
[0054] (5) Friction coefficient and wear scar diameter: The test was conducted in accordance with NB / SH / T 0189-2017. The test conditions were: long grinding for 10 minutes at a temperature of 200℃ and a speed of 1200rpm.
[0055] (6) Copper sheet corrosion: The test was conducted in accordance with GB / T 5096. The test conditions were 150℃ for 3 hours.
[0056] (7) Evaporation loss: The test was conducted in accordance with NB / SH / T 0059-2010, and the test conditions were 275℃ for 3 hours.
[0057] (8) Coking performance: Coking performance was tested at three temperatures (210℃, 275℃, and 300℃) in accordance with ASTM D6335.
[0058] The performance test results are shown in Tables 5 and 6. Figure 1 As shown.
[0059] Table 5. Properties of the synthetic ester-type chain oils prepared in Examples 1-4
[0060] Table 6. Performance of the chain oil prepared in Comparative Example 1 and the synthetic ester-type chain oils prepared in Comparative Examples 2 and 3
[0061] As can be seen from the performance data shown in Table 5, the chain oil provided in this application uses dipentapentapentanol ester and trimellitate ester with specific parameters as synthetic ester base oil, and is compounded with extreme pressure anti-wear agent, antioxidant, rust inhibitor and other components, and the ratio between each component is controlled. Through the intrinsic synergistic effect between the components, without the need to add viscosity index improvers, this oil effectively solves the problems of easy coking at high temperature, easy oil film rupture, and difficulty in balancing permeability and adhesion of existing synthetic ester chain oils, and exhibits excellent comprehensive performance.
[0062] Specifically, the synthetic ester-type chain oil prepared in this application maintains good fluidity at -15℃; it exhibits no coking at high temperatures of 210℃, 275℃, and even 300℃, fundamentally avoiding the risk of chain jamming caused by carbon buildup. Simultaneously, this oil has a high flash point, significantly improving its safety in use. In terms of lubrication performance, its viscosity index reaches 105~120, and its kinematic viscosity at 40℃ is not less than 320 mmHg. 2 This oil achieves an effective balance between permeability and adhesion without relying on viscosity index improvers. It can quickly penetrate the chain joint gaps while forming a durable and robust oil film at high temperatures. Combined with extreme pressure anti-wear agents, the oil's coefficient of friction can be as low as 0.052~0.067, and the minimum wear scar diameter can reach 0.32mm, significantly reducing abnormal chain wear and transmission resistance, and improving equipment operational reliability. Furthermore, the synergistic effect of antioxidants and rust inhibitors ensures extremely low corrosivity to metal materials and effectively controls evaporation loss at high temperatures, thereby extending the lubrication cycle and enhancing the oil film lubrication effect.
[0063] Figure 1 The coking performance of the synthetic ester-type chain oils prepared in Examples 1-4 and the chain oil of Comparative Example 1 was tested (test temperature was 300℃). It can be seen that the chain oil of Comparative Example 1 showed obvious coking after the coking performance test, while the chain oil prepared in the examples of this application showed almost no coking tendency and had excellent high-temperature performance.
[0064] In summary, this application, through the synergistic design and ratio optimization of the components, enables the chain oil to simultaneously achieve comprehensive performance improvements such as less coking, stronger adhesion, lower wear, and less evaporation loss under extreme high-temperature environments, providing a reliable solution for chain lubrication under harsh high-temperature conditions.
[0065] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A high-temperature resistant and coking-resistant synthetic ester-type chain oil, characterized in that, It is composed of synthetic ester base oil, extreme pressure anti-wear agent, antioxidant and rust inhibitor; The synthetic ester base oil is composed of dipentaerythritol ester and trimellitate; wherein the dipentaerythritol ester has a hydroxyl value of less than 10 mg KOH / g and an aniline point of less than 100°C, and is prepared by direct esterification of dipentaerythritol with C5~C10 fatty acids under the action of an acidic catalyst at 180°C~250°C; the trimellitate has an alkyl chain with 8~C12 carbon atoms. The synthetic ester base oil has a mass percentage of 90% to 99% in the chain oil, and the mass ratio of the dipentaerythritol ester to the trimellitate is (0.5 to 6):
1.
2. The synthetic ester-type chain oil according to claim 1, characterized in that, Based on parts by mass, it consists of the following components Composition: 94 to 99 parts synthetic ester base oil, 1 to 4 parts extreme pressure anti-wear agent, 0.2 to 2 parts antioxidant, 0.05 to 2 parts rust inhibitor.
3. The synthetic ester-type chain oil according to claim 1 or 2, characterized in that, The extreme pressure anti-wear agent is a phosphorus-based extreme pressure anti-wear agent, selected from one or more of alkyl phosphites, phosphate esters, and ammonium thiophosphate salts.
4. The synthetic ester-type chain oil according to claim 1 or 2, characterized in that, The antioxidant is an amine antioxidant and / or a phenolic antioxidant.
5. The synthetic ester-type chain oil according to claim 4, characterized in that, The weight ratio of the amine antioxidant to the phenolic antioxidant is (1.2~3):
1.
6. The synthetic ester-type chain oil according to claim 1 or 2, characterized in that, The rust inhibitor is selected from one or more of dibutylmethylene ester, olefinic succinic acid monoester, phosphate ester, amide, and benzotriazole derivative.
7. A method for preparing a synthetic ester-type chain oil according to any one of claims 1 to 6, characterized in that, Includes the following steps: The synthetic ester-based base oil is mixed with anti-wear agent, antioxidant and rust inhibitor under heating conditions according to the formula to prepare the synthetic ester-type chain oil.
8. The preparation method according to claim 7, characterized in that, The heating temperature is 90℃~100℃.
9. The application of a synthetic ester-type chain oil as described in any one of claims 1 to 6 in the lubrication of transmission chains in high-temperature industrial equipment.
10. A chain lubricant suitable for textile heat setting machines, characterized in that, It includes synthetic ester-type chain oils as described in any one of claims 1 to 6.