Antioxidant insulating oil as well as preparation method and application thereof

Abstract

The invention relates to the technical field of insulating oil, and particularly discloses antioxidant insulating oil as well as a preparation method and application thereof. The antioxidant insulating oil provided by the invention comprises synthetic oil, a composite antioxidant and a pour point depressant, the composite antioxidant is prepared from the following components in parts by weight according to the weight of the composite antioxidant: 15 to 25 parts of N-phenyl-1-naphthylamine, 25 to 40 parts of antioxidant 5057, 15 to 25 parts of 3-diisobutoxy thiophosphoryl thio-2-methyl-propionic acid and 10 to 15 parts of tetraethylene glycol dimethyl ether trihydrate; the invention also provides a preparation method of the antioxidant insulating oil. The antioxidant insulating oil provided by the invention not only has good insulativity and heat dissipation performance, but also has excellent oxidation resistance, and can meet the use requirements in a long-time high-temperature electric field environment when being used for a motor of an electric motorcycle.

Description

Technical Field

[0001] The present application relates to the technical field of insulating oils, and in particular to an antioxidant insulating oil and a preparation method and application thereof. Background Art

[0002] Electric motorcycle motors occupy a vital position in modern transportation. As a key medium for ensuring the proper functioning of electric motors, insulating oil plays an irreplaceable role in ensuring the safe and stable operation of electrical equipment. With the rapid development of the electric motorcycle industry, the operating environment of electric motors is becoming increasingly demanding. Insulating oil must not only withstand high voltages but also cope with the high temperatures generated by prolonged operation. However, the research and development of traditional insulating oils has largely focused on their basic insulation properties, with relatively insufficient attention paid to anti-oxidation and anti-aging properties. This directly impacts the overall performance and service life of the insulating oil.

[0003] To address this challenge, the industry is primarily improving insulating oil performance through the following methods. First, optimizing the choice of synthetic oil to enhance overall stability, for example, choosing synthetic oil over mineral oil to improve temperature resistance. Second, using functional additives such as phenolic or amine antioxidants to specifically improve the aging resistance of insulating oil. Furthermore, adjusting the formulation ratio to achieve a balance between different properties, striving to meet basic insulation requirements while also ensuring adequate antioxidant properties.

[0004] While these methods can mitigate the aging problem of insulating oil to a certain extent, they still have significant limitations in practical application. Especially under extreme operating conditions, such as those involving high temperatures and electric fields, these improvements often fail to fully prevent oxidation reactions, leading to a gradual loss of performance and ultimately shortening the effective service life of the insulating oil.

[0005] Therefore, the development of a special insulating oil for electric motorcycle motors that has both good insulation and heat dissipation properties and excellent antioxidant properties is of great significance to the electric motorcycle industry. Summary of the Invention

[0006] In order to overcome the problem of poor oxidation resistance of existing electric motorcycle motor insulating oil in a high-temperature electric field environment, the present application provides an antioxidant insulating oil and a preparation method and application thereof.

[0007] In a first aspect, the present application provides an antioxidant insulating oil, which adopts the following technical solution: An antioxidant insulating oil comprising synthetic oil, a composite antioxidant and a pour point depressant; Based on the weight of the composite antioxidant, the composite antioxidant comprises the following components in parts by weight: 15-25 parts of N-phenyl-1-naphthylamine, 25-40 parts of antioxidant 5057, 15-25 parts of 3-diisobutoxythiophosphonylthio-2-methyl-propionic acid and 10-15 parts of tetraethylene glycol dimethyl ether.

[0008] The present application provides an antioxidant insulating oil, which uses N-phenyl-1-naphthylamine, antioxidant 5057, and 3-diisobutoxythiophosphonylthio-2-methyl-propionic acid as antioxidants. By controlling the addition amount within the above range, it is possible to significantly improve the antioxidant performance of the insulating oil at high temperatures while ensuring the basic performance of the insulating oil, so that its rotating oxygen bomb at 150°C can reach more than 1300 minutes. The antioxidant insulating oil is used in electric motorcycle motors to provide excellent antioxidant and anti-wear protection, thereby extending the service life of the motor. Specifically: N-phenyl-1-naphthylamine can form a protective film on the surface of the metal motor, effectively reducing the oxidation and corrosion of the metal. Antioxidant 5057 can not only inhibit the oxidation reaction of the lubricating oil under high temperature and oxidizing conditions, thereby extending the service life of the lubricating oil, but also maintain the performance stability of the lubricating oil by capturing free radicals, and also provide certain anti-wear protection. On the one hand, 3-diisobutoxythiophosphonothio-2-methyl-propionic acid can form a chemical reaction film on the surface of the motor under high load and high temperature conditions, reducing the friction and wear of the metal surface and providing additional protection for the metal surface; on the other hand, its organic phosphorus structure can capture free radicals, thereby delaying the oxidation and deterioration of the lubricating oil and extending the service life of the lubricating oil. Triethylene glycol dimethyl ether as a solvent can promote the uniform dispersion of the various components and enhance the antioxidant effect. In summary, the antioxidant insulating oil provided by the present application adopts a synthetic oil with good electrical insulation and thermal stability as a base oil, and uses a composite antioxidant to enhance the antioxidant properties of the oil, thereby obtaining a special insulating oil for electric motorcycle motors that has both good insulation and heat dissipation properties and excellent antioxidant properties. Compared with existing insulating oils, it has significant antioxidant properties and a long service life.

[0009] Optionally, the composite antioxidant comprises the following components in parts by weight: 20-25 parts of N-phenyl-1-naphthylamine, 30-35 parts of antioxidant 5057, 18-23 parts of 3-diisobutoxyphosphonothioyl-2-methyl-propionic acid and 10-15 parts of tetraethylene glycol dimethyl ether.

[0010] In some embodiments, the weight portion of the N-phenyl-1-naphthylamine may be 15-20 parts or 20-25 parts.

[0011] In a specific embodiment, the weight portion of the N-phenyl-1-naphthylamine can also be 15 parts, 20 parts or 25 parts.

[0012] In some embodiments, the antioxidant 5057 may be present in an amount of 25-30 parts, 25-35 parts, 25-40 parts, 30-35 parts, 30-40 parts, or 35-40 parts by weight.

[0013] In a specific embodiment, the weight portion of the antioxidant 5057 can also be 25 parts, 30 parts, 35 parts Or 40 servings.

[0014] In some embodiments, the weight proportion of the 3-diisobutoxyphosphonothioylthio-2-methyl-propionic acid may be 15-18 parts, 15-20 parts, 15-23 parts, 15-25 parts, 18-20 parts, 18-23 parts, 18-25 parts, 20-23 parts, 20-25 parts or 23-25 parts.

[0015] In a specific embodiment, the weight proportion of the 3-diisobutoxyphosphonothioyl-2-methyl-propionic acid can also be 15 parts, 18 parts, 20 parts, 23 parts or 25 parts.

[0016] Optionally, the composite antioxidant comprises the following components in parts by weight: 20 parts of N-phenyl-1-naphthylamine, 35 parts of antioxidant 5057, 20 parts of 3-diisobutoxythiophosphonylthio-2-methyl-propionic acid and 15 parts of tetraethylene glycol dimethyl ether.

[0017] Optionally, the synthetic oil is selected from polyalphaolefins and / or ester oils.

[0018] Optionally, the pour point depressant is alkyl naphthalene and / or polymethacrylate.

[0019] Optionally, the weight ratio of the synthetic oil, the composite antioxidant and the pour point depressant is 100:(0.5-0.7):(0.02-0.04).

[0020] In some embodiments, the weight ratio of the synthetic oil, composite antioxidant and pour point depressant can be 100: (0.5-0.55): (0.02-0.04), 100: (0.5-0.6): (0.02-0.04), 100: (0.5-0.65): (0.02-0.04), 100: (0.5-0.7): (0.02-0.04), 100: (0.55-0. 6): (0.02-0.04), 100: (0.55-0.65): (0.02-0.04), 100: (0.55-0.7): (0.02-0.04), 100: (0.6-0.65): (0.02-0.04), 100: (0.6-0.7): (0.02-0.04) or 100: (0.65-0.7): (0.02-0.04).

[0021] In a specific embodiment, the weight ratio of the synthetic oil, the composite antioxidant and the pour point depressant can also be 100:0.5:0.03, 100:0.55:0.03, 100:0.6:0.03, 100:0.65:0.03 or 100:0.7:0.03.

[0022] In a second aspect, the present application provides a method for preparing an antioxidant insulating oil, comprising the following steps: First, N-phenyl-1-naphthylamine, antioxidant 5057, 3-diisobutoxythiophosphonylthio-2-methyl-propionic acid and tetraethylene glycol dimethyl ether are mixed uniformly to obtain a composite antioxidant; The composite antioxidant and pour point depressant are added into the synthetic oil and mixed evenly to obtain the antioxidant insulating oil.

[0023] In a third aspect, the present application provides an application of an antioxidant insulating oil in an electric motorcycle motor.

[0024] In summary, this application has the following beneficial effects: 1. This application uses N-phenyl-1-naphthylamine, an antioxidant and 3-diisobutoxythiophosphonylthio-2-methyl-propionic acid as a composite antioxidant and synthetic oil as a base oil to prepare an antioxidant insulating oil. The antioxidant insulating oil has both good insulation and heat dissipation properties and excellent antioxidant properties. When used in electric motorcycle motors, it can meet the requirements of long-term use in high-temperature electric field environments.

[0025] 2. The present application further controls the weight proportions of the components of the composite antioxidant within the following ranges: 20-25 parts of N-phenyl-1-naphthylamine, 30-35 parts of antioxidant 5057, 18-23 parts of 3-diisobutoxyphosphonothioyl-2-methyl-propionic acid, and 10-15 parts of tetraethylene glycol dimethyl ether; and controls the weight ratio of the synthetic oil, the composite antioxidant, and the pour point depressant within the range of 100:(0.55-0.65):(0.02-0.04). The obtained antioxidant insulating oil has better antioxidant properties and a longer service life. DETAILED DESCRIPTION

[0026] The present application provides an antioxidant insulating oil comprising a synthetic oil, a composite antioxidant, and a pour point depressant in a weight ratio of 100:(0.5-0.7):(0.02-0.04); wherein the synthetic oil is selected from polyalphaolefins and / or ester oils, and the pour point depressant is alkyl naphthalene and / or polymethacrylate. Based on the weight of the composite antioxidant, the composite antioxidant includes the following components in parts by weight: 15-25 parts of N-phenyl-1-naphthylamine, 25-40 parts of antioxidant 5057, 15-25 parts of 3-diisobutoxyphosphonothioyl-2-methyl-propionic acid, and 10-15 parts of tetraethylene glycol dimethyl ether; further, the composite antioxidant includes the following components in parts by weight: 20-25 parts of N-phenyl-1-naphthylamine, 30-35 parts of antioxidant 5057, 18-23 parts of 3-diisobutoxyphosphonothioyl-2-methyl-propionic acid, and 10-15 parts of tetraethylene glycol dimethyl ether.

[0027] The method for preparing the above-mentioned antioxidant insulating oil comprises the following steps: First, N-phenyl-1-naphthylamine, antioxidant 5057, 3-diisobutoxythiophosphonylthio-2-methyl-propionic acid and tetraethylene glycol dimethyl ether are mixed uniformly to obtain a composite antioxidant; The composite antioxidant and pour point depressant are added into the synthetic oil and mixed evenly to obtain the antioxidant insulating oil.

[0028] In the present application, the CAS number of N-phenyl-1-naphthylamine is 90-30-2, the CAS number of 3-diisobutoxyphosphonothioyl-2-methyl-propionic acid is 268567-32-4, the CAS number of antioxidant 5057 is 68411-46-1; the CAS number of tetraethylene glycol dimethyl ether is 143-24-8; the raw materials, reagents, solvents, etc. used in the present application can all be obtained commercially.

[0029] The present application is further described in detail below with reference to embodiments and performance testing.

[0030] Examples 1-10 Examples 1-10 each provide an antioxidant insulating oil.

[0031] The difference between the above embodiments is that the addition amount of each component in the composite antioxidant is shown in Table 1 below.

[0032] The method for preparing the antioxidant insulating oil provided in Examples 1-10 comprises the following steps: (1) First, N-phenyl-1-naphthylamine, antioxidant 5057, and 3-diisobutoxythiophosphonothio-2-methyl-propionic acid were weighed as shown in Table 1, and 150 mg of tetraethylene glycol dimethyl ether were mixed to obtain a composite antioxidant; (2) Adding a composite antioxidant and a pour point depressant to polyalphaolefin and mixing them evenly to obtain an antioxidant insulating oil; the weight ratio of the polyalphaolefin, the composite antioxidant and the pour point depressant is 100:0.6:0.03.

[0033] Table 1 Addition amount of each component in the composite antioxidant used in the antioxidant insulating oil provided in Examples 1-10 Examples 11-14 Examples 11-14 each provide an antioxidant insulating oil.

[0034] The difference between the above embodiment and embodiment 2 is that the weight ratio of the synthetic oil, the composite antioxidant and the pour point depressant is shown in Table 2 below.

[0035] Table 2 Weight ratio of synthetic oil, composite antioxidant and pour point depressant in Example 2 and Examples 11-14 Example Weight ratio of synthetic oil, composite antioxidant and pour point depressant 2 The weight ratio of polyalphaolefin, composite antioxidant and pour point depressant is 100:0.6:0.03 11 The weight ratio of polyalphaolefin, composite antioxidant and pour point depressant is 100:0.5:0.03 12 The weight ratio of polyalphaolefin, composite antioxidant and pour point depressant is 100:0.55:0.03 13 The weight ratio of polyalphaolefin, composite antioxidant and pour point depressant is 100:0.65:0.03 14 The weight ratio of polyalphaolefin, composite antioxidant and pour point depressant is 100:0.7:0.03 Comparative Example 1 Comparative Example 1 provides an antioxidant insulating oil.

[0036] The difference between the comparative example and Example 2 is that the amount of N-phenyl-1-naphthylamine added in the composite antioxidant is 100 mg, the amount of antioxidant 5057 added is 450 mg, and the amount of 3-diisobutoxythiophosphonylthio-2-methyl-propionic acid added is 200 mg.

[0037] Comparative Example 2 Comparative Example 2 provides an antioxidant insulating oil.

[0038] The difference between the comparative example and Example 2 is that the amount of 3-diisobutoxythiophosphonylthio-2-methyl-propionic acid added to the composite antioxidant is 0.

[0039] Comparative Example 3 Comparative Example 3 provides an antioxidant insulating oil.

[0040] The difference between the comparative example and Example 2 is that the amount of 3-diisobutoxythiophosphonylthio-2-methyl-propionic acid added to the composite antioxidant is 100 mg.

[0041] Comparative Example 4 Comparative Example 4 provides an antioxidant insulating oil.

[0042] The difference between the comparative example and Example 2 is that the amount of 3-diisobutoxyphosphonothioyl-2-methyl-propionic acid added to the composite antioxidant is 400 mg.

[0043] Comparative Example 5 Comparative Example 5 provides an antioxidant insulating oil.

[0044] The difference between the comparative example and Example 2 is that N-phenyl-1-naphthylamine is replaced by T511 antioxidant, antioxidant 5057 is replaced by L06 antioxidant, and the added amount of 3-diisobutoxythiophosphonylthio-2-methyl-propionic acid is 0.

[0045] Performance testing Various performance tests were performed on the antioxidant insulating oils obtained in Examples 1-14 and Comparative Examples 1-5. The results are shown in Table 3 below.

[0046] Table 3 Test results of various properties of antioxidant insulating oil obtained in Examples 1-14 and Comparative Examples 1-5 According to the test results in Table 3, the antioxidant insulating oils obtained in Examples 1-14 and Comparative Examples 1-5 of the present application both have good thermal conductivity and insulation properties. However, the antioxidant insulating oil obtained in Examples 1-14 can achieve a rotating oxygen bomb test at 150°C of 1315-1548 minutes, while the antioxidant insulating oil obtained in Comparative Examples 1-5 can only achieve a rotating oxygen bomb test at 150°C of 842-1183 minutes. Therefore, it is explained that the present application uses N-phenyl-1-naphthylamine, antioxidant 5057 and 3-diisobutoxythiophosphonylthio-2-methyl-propionic acid as a composite antioxidant, and their weight parts are controlled within the following range: 15-25 parts of N-phenyl-1-naphthylamine, 25-40 parts of antioxidant 5057, 15-25 parts of 3-diisobutoxythiophosphonylthio-2-methyl-propionic acid and 10-15 parts of tetraethylene glycol dimethyl ether. The obtained antioxidant insulating oil not only has good insulation and heat dissipation properties, but also has excellent antioxidant performance, which can meet the use requirements of electric motorcycle motors.

[0047] Further comparison of Examples 1-10 revealed that the antioxidant insulating oils obtained in Examples 2-3, 5, and 8-9 had a rotary oxygen bomb time of 1428-1518 min (≥1400 min) at 150°C, while the antioxidant insulating oils obtained in Examples 1, 4, 6-7, and 10 had a rotary oxygen bomb time of 1315-1384 min (<1400 min) at 150°C. Therefore, this indicates that the present application further controls the addition amount of each component in the composite antioxidant within the following range: 20-25 parts N-phenyl-1-naphthylamine, 30-35 parts antioxidant 5057, 18-23 parts 3-diisobutoxythiophosphonylthio-2-methyl-propionic acid, and 10-15 parts tetraethylene glycol dimethyl ether, resulting in an antioxidant insulating oil with better antioxidant properties and a longer service life.

[0048] The test results of Examples 2 and 11-14 show that the antioxidant insulating oils obtained in Examples 2 and 12-13 had a rotary oxygen bomb test time of 1451-1518 min (≥1400 min) at 150°C, while the antioxidant insulating oils obtained in Examples 11 and 14 had a rotary oxygen bomb test time of 1326-1387 min (<1400 min) at 150°C. Therefore, this demonstrates that by further controlling the weight ratio of synthetic oil, composite antioxidant, and pour point depressant within the range of 100:(0.55-0.65):(0.02-0.04), the antioxidant insulating oil obtained in this application has better antioxidant properties and a longer service life.

[0049] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications and improvements may be made based on the present invention. Therefore, such modifications and improvements, which do not depart from the spirit of the present invention, are intended to be within the scope of protection claimed herein.

Claims

1. An antioxidant insulating oil, characterized in that: Includes synthetic oil, compound antioxidant and pour point depressant; Based on the weight of the composite antioxidant, the composite antioxidant comprises the following components in parts by weight: 15-25 parts of N-phenyl-1-naphthylamine, 25-40 parts of antioxidant 5057, 15-25 parts of 3-diisobutoxythiophosphonylthio-2-methyl-propionic acid and 10-15 parts of tetraethylene glycol dimethyl ether.

2. The antioxidant insulating oil according to claim 1, characterized in that The composite antioxidant comprises the following components in parts by weight: 20-25 parts of N-phenyl-1-naphthylamine, 30-35 parts of antioxidant 5057, 18-23 parts of 3-diisobutoxythiophosphonylthio-2-methyl-propionic acid and 10-15 parts of tetraethylene glycol dimethyl ether.

3. The antioxidant insulating oil according to claim 1, characterized in that The composite antioxidant comprises the following components in parts by weight: 20 parts of N-phenyl-1-naphthylamine, 35 parts of antioxidant 5057, 20 parts of 3-diisobutoxythiophosphonylthio-2-methyl-propionic acid and 15 parts of tetraethylene glycol dimethyl ether.

4. The antioxidant insulating oil according to claim 1, characterized in that The synthetic oil is selected from polyalphaolefins and / or ester oils.

5. The antioxidant insulating oil according to claim 1, characterized in that The pour point depressant is alkyl naphthalene and / or polymethacrylate.

6. The antioxidant insulating oil according to any one of claims 1 to 5, characterized in that: The weight ratio of the synthetic oil, the composite antioxidant and the pour point depressant is 100:(0.5-0.7):(0.02-0.04).

7. The method for preparing the antioxidant insulating oil according to any one of claims 1 to 6, characterized in that: The following steps are involved: First, N-phenyl-1-naphthylamine, antioxidant 5057, 3-diisobutoxythiophosphonylthio-2-methyl-propionic acid and tetraethylene glycol dimethyl ether are mixed uniformly to obtain a composite antioxidant; The composite antioxidant and pour point depressant are added into the synthetic oil and mixed evenly to obtain the antioxidant insulating oil.

8. Use of the antioxidant insulating oil according to any one of claims 1 to 6 in an electric motorcycle motor.

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