A fire resistant hydraulic fluid composition and method of making same

Abstract

The application belongs to the field of hydraulic oil, and particularly discloses a kind of fire-resistant hydraulic oil composition and a preparation method thereof.The hydraulic oil composition comprises, by weight: 67-97 parts of main base oil, 5-30 parts of auxiliary base oil, 1.2-1.5 parts of lubricant, 1.5-2.0 parts of antioxidant, 0.03-0.06 parts of corrosion inhibitor, 0.01-0.08 parts of demulsifier, and 0.01-0.08 parts of defoamer.The auxiliary base oil is one of trimethylolpropane trisnonanoate, trimethylolpropane octadecanoate, and trimethylolpropane octyl laurate.The fire-resistant hydraulic oil is obtained by sequentially mixing the above components.The specific main-auxiliary base oil system used in the application is compounded with other additives, which can make the final oil product have excellent antioxidant properties, improve the upper limit of the use temperature, and thus improve the service life of the oil product, and help to improve the stability and low-temperature pumping capacity of the oil product during use.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic oil, specifically relating to a flame-retardant hydraulic oil composition and its preparation method. Background Technology

[0002] Hydraulic oil is the working medium of a hydraulic system. Its functions include power transmission, lubrication of friction points, rust prevention, corrosion resistance, cooling, and sealing. As the operating conditions of equipment become increasingly demanding, the requirements for fire prevention and environmental protection are also rising. Currently, the main fire-retardant hydraulic oils on the market are water-glycol type, synthetic ester type, and phosphate ester type. Water-glycol hydraulic oil contains a large amount of water, resulting in poor lubrication, unsuitable operating temperatures, and a tendency for equipment to rust. Phosphate ester type fire-retardant hydraulic oils are very expensive, and the waste oil is difficult to degrade, easily causing environmental pollution. Synthetic ester type fire-retardant hydraulic oils are environmentally friendly and have a wide operating range under various temperatures and pressures, thus gaining increasing acceptance from users in the market.

[0003] However, currently used synthetic ester-based flame-retardant hydraulic oils, due to their formulation technology, are extremely prone to oxidation and deterioration during use, leading to problems such as short oil change intervals and high energy consumption during equipment operation. While some research and development improvements exist, such as introducing vegetable oils, unsaturated polyol oleate esters, castor oil trimethylolpropane esters, or sulfurized oleic acid polyol esters, many problems remain. For example, unsaturated polyol oleate esters are prone to oxidation and deterioration at high temperatures, causing discoloration and increased kinematic viscosity; the use of vegetable oils causes a sharp increase in the product's pour point, making hydraulic system startup difficult and causing irreparable wear during the startup phase; castor oil trimethylolpropane esters and sulfurized oleic acid polyol esters readily emulsify with water during use, causing equipment rust, unstable hydraulic system pressure, and equipment wear.

[0004] Therefore, there is an urgent need to develop a product that can solve the problem of oxidation and deterioration of synthetic ester-based fire-retardant hydraulic oils during use. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a high-performance flame-retardant hydraulic oil formulation system, which possesses excellent oxidation resistance, high lubricity, and extremely rapid water separation properties. Based on this, a first aspect of this invention provides a flame-retardant hydraulic oil composition, the components of which, by weight, include: 67-97 parts of main base oil, 5-30 parts of auxiliary base oil, 1.2-1.5 parts of lubricant, 1.5-2.0 parts of antioxidant, 0.03-0.06 parts of corrosion inhibitor, 0.01-0.08 parts of demulsifier, and 0.01-0.08 parts of defoamer;

[0006] The primary base oil is pentaerythritol tetraoleate; the auxiliary base oil is one of trimethylolpropane truncolate, trimethylolpropane octylcaprate, and trimethylolpropane octyllaurate.

[0007] This invention discovers that by using a specific pentaerythritol tetraoleate and a specific auxiliary base oil in a specific ratio to form a primary-auxiliary base oil system, and then compounding it with other additives, the final oil product can exhibit excellent antioxidant properties, increasing the upper limit of operating temperature from the conventional 90℃ to 150℃, thereby improving the oil's service life. Furthermore, the oil's sealing adaptability is improved, and its pour point is lowered, contributing to enhanced stability and low-temperature pumping capability during use. Changing the primary-auxiliary base oil system of this invention (including the specific types and amounts of the primary and auxiliary base oils) will significantly impact the final oil product's performance.

[0008] In some preferred embodiments, the defoamer is a polysiloxane emulsion. This invention has found that in the aforementioned primary-secondary base oil system, the use of polysiloxane emulsions is better suited to the system, resulting in better performance. When non-silicone defoamers are used, they cannot meet the requirements for suppressing oil foam during use. Furthermore, when using dimethyl silicone oil products, their air release capacity decreases significantly, leading to increased oil temperature and decreased lubricity during use.

[0009] In some preferred embodiments, the lubricant is at least one selected from QT301 anti-micropitting extreme pressure anti-wear agent, nitrogen-containing derivative of thiophosphate, tricresyl phosphate, amine phosphate salt, amine thiophosphate salt, and triphenyl thiophosphate. In a more preferred embodiment, the lubricant is QT301 anti-micropitting extreme pressure anti-wear agent and ammonium phosphate salt. The present invention has found that using a more preferred lubricant in the above-mentioned primary-secondary base oil system can further improve lubrication performance and simultaneously enhance oxidation resistance to a certain extent.

[0010] In some preferred embodiments, the antioxidant is at least one selected from di-tert-butyl-p-cresol, a mixture of di-tert-butyl esters, N-phenyl-α-naphthylamine, octyl diphenylamine, 4,4'-methylenebis(2,6-di-tert-butylphenol), and thioether-based phenolic antioxidants. In more preferred embodiments, the antioxidant is N-phenyl-α-naphthylamine, octyl diphenylamine, 4,4'-methylenebis(2,6-di-tert-butylphenol), and thioether-based phenolic antioxidants.

[0011] In some preferred embodiments, the corrosion inhibitor is at least one selected from thiadiazole derivatives, benzotriazole derivatives, benzotriazole, methylbenzotriazole, and sodium methylbenzotriazole. In a more preferred embodiment, the corrosion inhibitor is a benzotriazole derivative.

[0012] In some preferred embodiments, the demulsifier is a polyether polymer.

[0013] The second aspect of the present invention provides a method for preparing the above-mentioned fire-retardant hydraulic oil composition, comprising the following steps: stirring the above-mentioned main base oil and the above-mentioned auxiliary base oil evenly, then adding the above-mentioned lubricant and the above-mentioned antioxidant, and stirring until the solution is clear and transparent; subsequently adding the above-mentioned corrosion inhibitor, the above-mentioned defoamer and the above-mentioned demulsifier, and stirring until transparent to obtain the above-mentioned fire-retardant hydraulic oil composition; wherein, the temperature is controlled at 50℃-55℃ throughout the preparation method.

[0014] The beneficial effects of this invention are as follows: The specific primary-secondary base oil system used in this invention, combined with other additives, enables the final oil product to have excellent antioxidant properties, increase the upper limit of the operating temperature, thereby increasing the service life of the oil product, and helps to improve the stability and low-temperature pumping capability of the oil product during use. Attached Figure Description

[0015] Figure 1 The images shown are initial photographs of the flame-retardant hydraulic oil compositions obtained in Examples 1-2 and the hydraulic oil compositions obtained in Comparative Examples 1-4 before being subjected to oven oxidation experiments.

[0016] Figure 2 The images shown are photographs of the results of oven oxidation experiments on the flame-retardant hydraulic oil compositions obtained in Examples 1-2 and the hydraulic oil compositions obtained in Comparative Examples 1-4. Detailed Implementation

[0017] The following will provide a clear and complete description of the concept and technical effects of the present invention in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, solution and effects of the present invention. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0018] The following content refers to the raw materials and their sources:

[0019] Trimethylolpropane oleate: CRODA

[0020] Pentaerythritol tetraoleate: CRODA

[0021] P3970 Trimethylolpropane Octyl Caprylate: CRODA

[0022] P2720 Trimethylolpropane-Trinonate: CRODA

[0023] QT301 Anti-Micropitting Extreme Pressure Anti-wear Agent: Superlubricating Technology (Foshan) Co., Ltd.

[0024] IRGALUBE349 Phosphate Amine Salt: BASF

[0025] T557 Octyldiphenylamine: Jinzhou Xinxing Petroleum Additives Co., Ltd.

[0026] T511 4,4'-Methylenebis(2,6-di-tert-butylphenol): Guangzhou Ruicheng New Materials Co., Ltd.

[0027] T531N-Phenylan-α-Naphthylamine: Jinzhou Xinxing Petroleum Additives Co., Ltd.

[0028] L115 Thioether-based Phenolic Antioxidant: BASF

[0029] I39 Benzotriazole derivatives: BASF

[0030] T1001 Demulsifier: Guangzhou Ruishengyan Chemical Technology Co., Ltd.

[0031] 155 Polysiloxane Emulsion: Mengqingxin Additives Trading (Shanghai) Co., Ltd.

[0032] Neopentyl glycol dioleate: Guangzhou Ruicheng New Materials Co., Ltd.

[0033] Example 1

[0034] A flame-retardant hydraulic oil composition, comprising, by weight: 67 parts pentaerythritol tetraoleate, 30 parts trimethylolpropane trefoilate, 1.0 part QT301 anti-micropitting extreme pressure anti-wear agent, 0.4 parts IRGALUBE349 phosphate ester amine salt, 0.6 parts T557 octyl diphenylamine, 0.33 parts T511 4,4'-methylene bis(2,6-di-tert-butylphenol), 0.30 parts T531 N-phenyl-α-naphthylamine, 0.50 parts L115 thioether-based phenolic antioxidant, 0.05 parts I39 benzotriazole derivative, 0.01 parts T1001 demulsifier, and 0.01 parts 155 polysiloxane emulsion.

[0035] The preparation method of the flame-retardant hydraulic oil composition includes the following steps: pentaerythritol tetraoleate and trimethylolpropane trefonate are stirred evenly, and then QT301 anti-micropitting extreme pressure anti-wear agent, IRGALUBE349 phosphate ester amine salt, T557 octyl diphenylamine, T511 4,4'-methylene bis(2,6-di-tert-butylphenol), T531 N-phenyl-α-naphthylamine, and L115 thioether phenolic antioxidant are added and stirred until the solution is clear and transparent; then I39 benzotriazole derivative, T1001 demulsifier, and 155 polysiloxane emulsion are added and stirred until transparent to obtain the flame-retardant hydraulic oil composition; wherein, the temperature is controlled at 50°C throughout the preparation process.

[0036] Example 2

[0037] A flame-retardant hydraulic oil composition differs from that of Example 1 in that "30 parts of trimethylolpropane trinonanoate" in Example 1 is replaced with "30 parts of trimethylolpropane octyl caprylate"; otherwise, it is the same as Example 1. The preparation method differs from that of Example 1 in that "30 parts of trimethylolpropane trinonanoate" in Example 1 is replaced with "30 parts of trimethylolpropane octyl caprylate"; otherwise, it is the same as Example 1.

[0038] Comparative Example 1

[0039] A hydraulic oil composition differs from that of Example 1 in that "67 parts pentaerythritol tetraoleate and 30 parts trimethylolpropane trinonanoate" in Example 1 are replaced with "97 parts trimethylolpropane oleate"; otherwise, the composition is the same as that of Example 1. Its preparation method includes the following steps:

[0040] QT301 anti-micropitting extreme pressure anti-wear agent, IRGALUBE349 phosphate ester amine salt, T557 octyl diphenylamine, T511 4,4'-methylene bis(2,6-di-tert-butylphenol), T531 N-phenyl-α-naphthylamine, and L115 thioether phenolic antioxidant were added to trimethylolpropane oleate and stirred until the solution was clear and transparent. Then, I39 benzotriazole derivative, T1001 demulsifier, and 155 polysiloxane emulsion were added and stirred until transparent to obtain the hydraulic oil composition. The temperature was controlled at 50°C throughout the preparation process.

[0041] Comparative Example 2

[0042] A hydraulic oil composition differs from that of Example 1 in that "67 parts pentaerythritol tetraoleate and 30 parts trimethylolpropane trinonanoate" in Example 1 are replaced with "67 parts trimethylolpropane oleate and 30 parts trimethylolpropane octyl caprylate"; otherwise, the composition is the same as that of Example 1. Its preparation method includes the following steps:

[0043] Trimethylolpropane oleate and trimethylolpropane octyl decanoate were stirred evenly, and then QT301 anti-micropitting extreme pressure anti-wear agent, IRGALUBE349 phosphate ester amine salt, T557 octyl diphenylamine, T511 4,4'-methylene bis(2,6-di-tert-butylphenol), T531 N-phenyl-α-naphthylamine, and L115 thioether phenolic antioxidant were added and stirred until the solution was clear and transparent. Subsequently, I39 benzotriazole derivative, T1001 demulsifier, and 155 polysiloxane emulsion were added and stirred until transparent to obtain the hydraulic oil composition. The temperature was controlled at 50°C throughout the preparation process.

[0044] Comparative Example 3

[0045] A hydraulic oil composition differs from that of Example 1 in that "30 parts of trimethylolpropane trinonanoate" in Example 1 is replaced with "30 parts of neopentyl glycol dioleate"; otherwise, it is the same as Example 1. The preparation method differs from that of Example 1 in that "30 parts of trimethylolpropane trinonanoate" in Example 1 is replaced with "30 parts of neopentyl glycol dioleate"; otherwise, it is the same as Example 1.

[0046] Comparative Example 4

[0047] A hydraulic oil composition differs from Example 1 in that the "67 parts pentaerythritol tetraoleate and 30 parts trimethylolpropane tricornate" in Example 1 are adjusted to "30 parts pentaerythritol tetraoleate and 67 parts trimethylolpropane tricornate"; otherwise, it is the same as Example 1. The preparation method differs from Example 1 in that the "67 parts pentaerythritol tetraoleate and 30 parts trimethylolpropane tricornate" in Example 1 are adjusted to "30 parts pentaerythritol tetraoleate and 67 parts trimethylolpropane tricornate"; otherwise, it is the same as Example 1.

[0048] The composition of the hydraulic oil compositions of Examples 1-2 and Comparative Examples 1-4 is shown in Table 1.

[0049] Table 1

[0050]

[0051] The flame-retardant hydraulic oil compositions prepared in Examples 1-2 and the hydraulic oil compositions prepared in Comparative Examples 1-4 were used as test oils for tests on properties such as viscosity-temperature, lubricity, and anti-aging. The test methods and results are shown in Table 2 and 3. Figure 1-2 As shown. The outdoor weathering test method involves sealing the oil in a colorless, transparent glass bottle and placing it outdoors in an unobstructed location. After 90 days, observe whether any insoluble substances precipitate out. The oven oxidation test method involves adding 50g of oil to a beaker (250mL) and then incubating at 150℃ for 48 hours.

[0052] Table 2

[0053]

[0054]

[0055] Based on the data in Table 2 and comparison photos of oxidation in the oven ( Figure 1 The images shown are initial photographs of the flame-retardant hydraulic oil compositions obtained in Examples 1-2 and the hydraulic oil compositions obtained in Comparative Examples 1-4 before being subjected to oven oxidation experiments. Figure 2The images shown are photographs of the results of oven oxidation experiments on the flame-retardant hydraulic oil compositions obtained in Examples 1-2 and Comparative Examples 1-4. It can be seen that Examples 1, 2, Comparative Examples 1 and 3 meet the requirements of NB / SH / T 6045-2021 standard, while the viscosity of the products in Comparative Examples 2 and 4 does not meet the requirements of NB / SH / T 6045-2021 standard. The products in Examples 1 and 2 can be used at temperatures up to 150℃. At 150℃, Comparative Example 1 produces insoluble substances in the oil, affecting its filtration performance and causing a cloudy appearance, failing to meet the requirements for continued use. Comparative Example 3 significantly darkens the oil color, shortening its service life.

[0056] The above description is merely a preferred embodiment of the present invention. The present invention is not limited to the above-described embodiments. Any embodiment that achieves the technical effects of the present invention using the same means should fall within the protection scope of the present invention. Within the protection scope of the present invention, various modifications and variations can be made to the technical solutions and / or implementation methods.

Claims

1. A flame-retardant hydraulic oil composition, characterized in that, It is composed of the following components by weight: 67-97 parts of main base oil, 5-30 parts of auxiliary base oil, 1.2-1.5 parts of lubricant, 1.5-2.0 parts of antioxidant, 0.03-0.06 parts of corrosion inhibitor, 0.01-0.08 parts of demulsifier, and 0.01-0.08 parts of defoamer; The primary base oil is pentaerythritol tetraoleate; the secondary base oil is trimethylolpropane trinonanoate.

2. The flame-retardant hydraulic oil composition according to claim 1, characterized in that, The defoamer is a polysiloxane emulsion.

3. The flame-retardant hydraulic oil composition according to claim 1, characterized in that, The lubricant is at least one of QT301 anti-micropitting extreme pressure anti-wear agent, nitrogen-containing derivative of thiophosphate, tricresyl phosphate, phosphate ester amine salt, thiophosphate amine salt, and triphenyl thiophosphate.

4. The flame-retardant hydraulic oil composition according to claim 3, characterized in that, The lubricant is QT301 anti-micropitting extreme pressure anti-wear agent and phosphate ester amine salt.

5. The flame-retardant hydraulic oil composition according to claim 1, characterized in that, The antioxidant is at least one of di-tert-butyl-p-cresol, di-tert-butyl mixed ester, N-phenyl-α-naphthylamine, octyl diphenylamine, 4,4'-methylenebis(2,6-di-tert-butylphenol), and thioether-based phenolic antioxidants.

6. The flame-retardant hydraulic oil composition according to claim 5, characterized in that, The antioxidants are N-phenyl-α-naphthylamine, octyl diphenylamine, 4,4'-methylenebis(2,6-di-tert-butylphenol) and thioether-based phenolic antioxidants.

7. The flame-retardant hydraulic oil composition according to claim 1, characterized in that, The corrosion inhibitor is at least one of thiadiazole derivatives, benzotriazole derivatives, benzotriazole, methylbenzotriazole, and sodium methylbenzotriazole.

8. The flame-retardant hydraulic oil composition according to claim 7, characterized in that, The corrosion inhibitor is a benzotriazole derivative.

9. The flame-retardant hydraulic oil composition according to claim 1, characterized in that, The demulsifier is a polyether polymer compound.

10. A method for preparing the flame-retardant hydraulic oil composition according to any one of claims 1 to 9, characterized in that, Includes the following steps: The primary base oil and the auxiliary base oil are stirred evenly, and then the lubricant and the antioxidant are added and stirred until the solution is clear and transparent; then the corrosion inhibitor, the defoamer and the demulsifier are added and stirred until transparent to obtain the fire-retardant hydraulic oil composition; wherein the temperature is controlled at 50 ℃-55 ℃ throughout the preparation process.

Images