Phenyl-containing long-chain alkyl fluorosilicone oil as well as preparation method and application thereof

Abstract

The invention discloses phenyl-containing long-chain alkyl fluorosilicone oil as well as a preparation method and application thereof. Through modification of silicone oil, phenyl, trifluoropropyl and long-chain alkyl are introduced into siloxane chain links, so that the silicone oil is endowed with high temperature resistance, good lubricity and excellent base oil additive compatibility. The preparation process and reaction conditions are mild, the repeatability is good, the adopted catalyst is easy to remove or has no obvious influence on the product performance, and the reaction process does not use an organic solvent and is green and environment-friendly.

Description

Technical Field

[0001] The present invention belongs to the field of silicone lubrication, and particularly relates to a phenyl-containing long-chain alkyl fluorosilicone oil, a preparation method thereof, and an application thereof. Background Art

[0002] With the rapid development of modern industry, mechanical equipment is constantly upgraded and updated, tending to high-load, high-speed, high-temperature and other operating scenarios. And these complex mechanical working environments are inevitable to wear, and using high-efficiency grease is an effective method to reduce the resource and energy losses caused by wear. Traditional mineral oils, animal and vegetable oils gradually cannot meet the demanding working environments, and synthetic base oils have advantages in high-temperature resistance and lubrication performance. As a kind of synthetic oil, silicone oil has good hydrophobicity, small surface tension, antioxidant, low volatility, non-toxic, excellent high and low temperature performance, etc. However, due to the poor boundary lubrication performance of silicone oil, when silicone oil is used for lubricating mechanical equipment, especially at the steel / steel friction interface, it may not be able to form a stable lubricating film between the friction pairs, and the lubricating film is prone to rupture during the lubrication process, resulting in serious friction and wear. In addition, silicone oil has poor compatibility with other hydrocarbon base oils and additives, so the lubrication effect as a lubricant is not good. Summary of the Invention

[0003] To solve the disadvantages and deficiencies of the prior art, the primary object of the present invention is to provide a phenyl-containing long-chain alkyl fluorosilicone oil. The present invention introduces phenyl, long-chain alkyl, and trifluoropropyl into the siloxane to obtain a modified silicone oil, whose heat resistance, lubricity, and compatibility with the base oil have been greatly improved, expanding its scope of use.

[0004] Another object of the present invention is to provide a preparation method of the above-mentioned phenyl-containing long-chain alkyl fluorosilicone oil. The raw materials of the synthesis method of the present invention are all commercial siloxane monomers or siloxane cyclopolymers, with low cost, mild reaction conditions, and easy to control.

[0005] Another object of the present invention is to provide an application of the above-mentioned phenyl-containing long-chain alkyl fluorosilicone oil.

[0006] The object of the present invention is achieved by the following technical solutions:

[0007] The first aspect of the present invention discloses a phenyl-containing long-chain alkyl fluorosilicone oil, whose structural formula is shown as follows:

[0008]

[0009] Wherein, R F is a fluorine-containing alkyl group; R phis phenyl or substituted phenyl; R1 and R2 are the same or different and are methyl, phenyl, dodecyl or vinyl, R3, R4, R5, R6, R7, R8 are the same or different and are C1-C12 alkyl, x is an integer from 1 to 10, y is an integer from 1 to 50; z is an integer from 1 to 10, w is an integer from 1 to 10.

[0010] Preferably, R F is trifluoropropyl; R ph is phenyl; R1 and R2 are different and are methyl and dodecyl respectively; R3, R4, R5, R6 are the same and are methyl; R7, R8 are different and are methyl and dodecyl respectively.

[0011] Preferably, x is from 1 to 2; y is from 14 to 20; z is from 2 to 3; w is from 1 to 2; Most preferably, x is from 1 to 2; y is from 14 to 18; z is from 2 to 3; w is from 1 to 2.

[0012] Preferably, the phenyl-containing long-chain alkyl fluorosilicone oil is a colorless or light yellow transparent liquid, with a viscosity of 23.1-52.4 mm 2 / s at 100 °C, and a viscosity of 107.3-156.8 mm 2 / s at 40 °C, a flash point of 294-324 °C, and a pour point of -15 to -21 °C.

[0013] The second aspect of the present invention discloses a preparation method of the above-mentioned phenyl-containing long-chain alkyl fluorosilicone oil, which comprises the following steps:

[0014] (1) Heating and reacting an alkyl phenyl-terminated hydroxyl silicone oil, an alkyl fluorine-containing cyclic trisiloxane, a tetraalkyl tetrahydrocyclotetrasiloxane, an octaalkyl cyclotetrasiloxane and a capping agent under the action of a catalyst to obtain a phenyl-containing fluorosilicone oil with a silicon-hydrogen structure;

[0015] (2) Carrying out a catalytic addition reaction on the phenyl-containing fluorosilicone oil with a silicon-hydrogen structure and a long-chain olefin to obtain a phenyl-containing long-chain alkyl fluorosilicone oil.

[0016] Preferably, in the alkyl phenyl-terminated hydroxyl silicone oil in step (1), the alkyl is C1-C12 alkyl, and the phenyl-containing group is phenyl or substituted phenyl; more preferably, it is a methyl phenyl-terminated hydroxyl silicone oil.

[0017] More preferably, the alkyl phenyl-terminated hydroxyl silicone oil in step (1) is obtained by heating and reacting water and an alkyl phenyl dimethoxysilane at 50-100 °C for 1-24 h under the action of a catalyst.

[0018] More preferably, the molar ratio of methoxy group to water in the alkyl phenyl dimethoxysilane is 1:0.6-20.

[0019] More preferably, after the heating reaction of the water and the alkyl phenyl dimethoxysilane is completed, the alkyl phenyl hydroxy-terminated silicone oil is obtained by vacuum distillation at 100-180 °C and 0-0.09 MPa.

[0020] Preferably, in the alkyl fluorine-containing cyclotrisiloxane in step (1), the alkyl group is a C1-C12 alkyl group, and the carbon chain length of the fluorine-containing group is C1-C12; more preferably, it is methyltrifluoropropyl cyclotrisiloxane.

[0021] Preferably, in the tetraalkyltetrahydrocyclotetrasiloxane in step (1), the alkyl group is a C1-C12 alkyl group; more preferably, it is tetramethyltetrahydrocyclotetrasiloxane.

[0022] Preferably, in the octaalkylcyclotetrasiloxane in step (1), the alkyl group is a C1-C12 alkyl group; more preferably, it is octamethylcyclotetrasiloxane.

[0023] Preferably, the molar ratio of the alkyl phenyl hydroxy-terminated silicone oil, alkyl fluorine-containing cyclotrisiloxane, tetraalkyltetrahydrocyclotetrasiloxane, and octaalkylcyclotetrasiloxane in step (1) is x / n: z / 3: w / 4: y / 4, where x is an integer from 1 to 10, y is an integer from 1 to 50, z is an integer from 1 to 10, and w is an integer from 1 to 10; the number of repeating units of the alkyl phenyl hydroxy-terminated silicone oil is n = 4-15, n ≥ x and is an integer; x, y, z, and w respectively correspond to the number of repeating units of different repeating units in the following phenyl long-chain alkyl fluorosilicone oil:

[0024]

[0025] Preferably, the endblocking agent in step (1) is disiloxane, and its substituents are at least one of methyl, phenyl, and hydrogen; more preferably, the endblocking agent is at least one of hexamethyldisiloxane, tetramethyldiphenylsiloxane, dimethyltetraphenyldisiloxane, and tetramethyldihydroxysiloxane; most preferably, it is tetramethyldihydroxysiloxane.

[0026] Preferably, the molar amount of the endblocking agent in step (1) is in a ratio of 1:1-50 to the total molar amount of the alkyl phenyl hydroxy-terminated silicone oil, alkyl fluorine-containing cyclotrisiloxane, tetraalkyltetrahydrocyclotetrasiloxane, and octaalkylcyclotetrasiloxane; more preferably, it is 1:7.4.

[0027] Preferably, the catalyst in step (1) is at least one of strong acids and macroporous strongly acidic cation exchange resins; the addition amount of the catalyst accounts for 1-6 phr (parts per hundred grams) of the total mass of the reaction system, and the total mass of the reaction system refers to the total mass of the alkyl phenyl hydroxy-terminated silicone oil, alkyl fluorine-containing cyclotrisiloxane, tetraalkyltetrahydrocyclotetrasiloxane, octaalkylcyclotetrasiloxane, and endblocking agent.

[0028] Preferably, the temperature of the heating reaction in step (1) is 50 - 100°C, and the time is 1 - 24 h; more preferably, the heating reaction is carried out at 55°C for 6 h.

[0029] Preferably, after the heating reaction in step (1), vacuum distillation is carried out to obtain phenyl fluorosilicone oil containing silicon - hydrogen structure; the temperature of the vacuum distillation is 170 - 260°C, and the absolute pressure is 0 - 0.09 MPa.

[0030] Preferably, the long - chain olefin in step (2) is C6 - C18 olefin, and the number of C = C bonds is an integer from 1 to 5.

[0031] Preferably, the molar ratio of Si - H in the phenyl fluorosilicone oil containing silicon - hydrogen structure to the double bond in the long - chain olefin in step (2) is 1:1 - 1.5; more preferably, it is 1:1.2.

[0032] Preferably, the temperature of the catalytic addition reaction in step (2) is 50 - 150°C, and the time is 2 - 5 h; more preferably, the catalytic addition reaction is carried out at 100°C for 4 h.

[0033] Preferably, the catalyst used in the catalytic addition reaction in step (2) is a platinum - based catalyst; more preferably, it is chloroplatinic acid; the dosage of the catalyst accounts for 1 - 6 ppm of the mass of the reaction system.

[0034] Preferably, after the addition reaction in step (2), vacuum distillation is carried out at 170 - 260°C and 0 - 0.09 MPa to obtain phenyl long - chain alkyl fluorosilicone oil.

[0035] The third aspect of the present invention provides the application of the above - mentioned phenyl long - chain alkyl fluorosilicone oil.

[0036] Preferably, it is applied in the lubrication of mechanical equipment.

[0037] More preferably, the mass percentage of the phenyl long - chain alkyl fluorosilicone oil, RJ - 1417 base oil, and T306 extreme - pressure anti - wear agent is 100:10 - 30:1 - 3.

[0038] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0039] (1) Compared with the traditional method of hydrolyzing chlorosilane, the synthesis route of the phenyl long - chain alkyl fluorosilicone oil of the present invention has fewer by - products, no waste acid is generated, it is more green and environmentally friendly, and the synthesis process is safe, stable and controllable.

[0040] (2) The phenyl long - chain alkyl fluorosilicone oil of the present invention is a light - yellow transparent liquid, has excellent heat stability, has a prospect in high - temperature lubrication, the introduction of long - chain alkyl groups improves the compatibility of the silicone oil with hydrocarbon - based base oils and additives, is easy to compound, improves the lubrication performance of the silicone oil, and expands the scope of use. Description of the Drawings

[0041] Figure 1 Schematic diagram of the synthesis process of phenyl long-chain alkyl fluorosilicone oil for the example

[0042] Figure 2 Infrared spectrum of phenyl long-chain alkyl fluorosilicone oil for Example 3

[0043] Figure 3 Proton nuclear magnetic resonance spectrum of phenyl long-chain alkyl fluorosilicone oil for Example 3 Detailed Description of the Invention

[0044] The present invention will be further described in detail below in conjunction with examples and drawings, but the embodiments of the present invention are not limited thereto

[0045] In the embodiments of the present invention, those not specified under specific conditions are carried out according to conventional conditions or conditions recommended by the manufacturer. Raw materials, reagents, etc. not specified by the manufacturer can all be obtained as conventional products through commercial purchase

[0046] Comparative Example 1

[0047] 15 g of methylphenyl hydroxy-terminated silicone oil (the number of repeating units n is 6), 70 g of octamethylcyclotetrasiloxane, 0 g of tetramethyltetrahydrocyclotetrasiloxane, 10 g of trifluoropropylmethylcyclotrisiloxane were added to a 150 ml four-necked flask equipped with a thermometer, a mechanical stirrer, and a reflux condenser. 6 g of macroporous strongly acidic cation exchange resin and 4 g of tetramethyldihydroxysiloxane were added. After reacting at 55 °C for 6 h, the acidic cation resin was removed by filtration. After filtration, low-boiling fractions were removed by vacuum distillation at a vacuum of 0.09 MPa and 180 °C to obtain an intermediate product; dodecene was added to the intermediate product in an amount of Vi:Si-H = 1.2:1, and 5 ppm of chloroplatinic acid catalyst was added. After reacting at 100 °C for 4 h, low-boiling fractions were removed by vacuum distillation at a vacuum of 0.09 MPa and 180 °C to obtain phenyl long-chain alkyl fluorosilicone oil. The product was a light yellow transparent liquid, and the number of repeating units in its structure was x = 5, y = 45, z = 30, and w = 0, respectively

[0048] Example 1

[0049] Add 5 g of methylphenyl hydroxy-terminated silicone oil (the number of repeating units n is 6), 70 g of octamethylcyclotetrasiloxane, 5 g of tetramethyltetrahydrocyclotetrasiloxane, and 15 g of trifluoropropylmethylcyclotrisiloxane into a 150 ml four-necked flask equipped with a thermometer, a mechanical stirrer, and a reflux condenser. Then add 6 g of macroporous strongly acidic cation exchange resin and 6 g of tetramethyldihydroxysiloxane. React at 55 °C for 6 h, then filter to remove the acidic cation resin. After filtration, distill off the low-boiling fractions under reduced pressure at a vacuum of 0.09 MPa and 180 °C to obtain an intermediate product. Add dodecene to the intermediate product in a ratio of Vi:Si-H = 1.2:1, add 5 ppm of chloroplatinic acid catalyst, and react at 100 °C for 4 h. Then distill off the low-boiling fractions under reduced pressure at a vacuum of 0.09 MPa and 180 °C to obtain phenyl long-chain alkyl fluorosilicone oil. The product is a light yellow transparent liquid, and the number of repeating units in its structure is x = 1, y = 20, z = 2, and w = 2 respectively.

[0050] Example 2

[0051] Add 10 g of methylphenyl hydroxy-terminated silicone oil (the number of repeating units n is 6), 70 g of octamethylcyclotetrasiloxane, 5 g of tetramethyltetrahydrocyclotetrasiloxane, and 20 g of trifluoropropylmethylcyclotrisiloxane into a 150 ml four-necked flask equipped with a thermometer, a mechanical stirrer, and a reflux condenser. Then add 6 g of macroporous strongly acidic cation exchange resin and 6 g of tetramethyldihydroxysiloxane. React at 55 °C for 6 h, then filter to remove the acidic cation resin. After filtration, distill off the low-boiling fractions under reduced pressure at a vacuum of 0.09 MPa and 180 °C to obtain an intermediate product. Add dodecene to the intermediate product in a ratio of Vi:Si-H = 1.2:1, add 5 ppm of chloroplatinic acid catalyst, and react at 100 °C for 4 h. Then distill off the low-boiling fractions under reduced pressure at a vacuum of 0.09 MPa and 180 °C to obtain phenyl long-chain alkyl fluorosilicone oil. The product is a light yellow transparent liquid, and the number of repeating units in its structure is x = 1, y = 14, z = 2, and w = 1 respectively.

[0052] Example 3

[0053] Add 15 g of methylphenyl hydroxy-terminated silicone oil (the number of repeating units n is 6), 70 g of octamethylcyclotetrasiloxane, 5 g of tetramethyltetrahydrocyclotetrasiloxane, and 25 g of trifluoropropylmethylcyclotrisiloxane into a 150 ml four-necked flask equipped with a thermometer, a mechanical stirrer, and a reflux condenser. Then add 6 g of macroporous strongly acidic cation exchange resin and 6 g of tetramethyldihydroxysiloxane. React at 55 °C for 6 h, then filter to remove the acidic cation resin. After filtration, distill under reduced pressure at a vacuum of 0.09 MPa and 180 °C to remove low-boiling fractions, obtaining an intermediate product. Add dodecene to the intermediate product in a ratio of Vi:Si-H = 1.2:1, add 5 ppm of chloroplatinic acid catalyst, and react at 100 °C for 4 h. Then distill under reduced pressure at a vacuum of 0.09 MPa and 180 °C to remove low-boiling fractions, obtaining phenyl long-chain alkyl fluorosilicone oil. The product is a pale yellow transparent liquid, and the number of repeating units in its structure are x = 2, y = 18, z = 3, and w = 1 respectively.

[0054] Comparative Example 2

[0055] Add 30 g of methylphenyl hydroxy-terminated silicone oil (the number of repeating units n is 6), 10 g of tetramethyltetrahydrocyclotetrasiloxane, and 50 g of trifluoropropylmethylcyclotrisiloxane into a 150 ml four-necked flask equipped with a thermometer, a mechanical stirrer, and a reflux condenser. Then add 6 g of macroporous strongly acidic cation exchange resin and 12 g of tetramethyldihydroxysiloxane. React at 55 °C for 6 h, then filter to remove the acidic cation resin. After filtration, distill under reduced pressure at a vacuum of 0.09 MPa and 180 °C to remove low-boiling fractions, obtaining an intermediate product. Add dodecene to the intermediate product in a ratio of Vi:Si-H = 1.2:1, add 5 ppm of chloroplatinic acid catalyst, and react at 100 °C for 4 h. Then distill under reduced pressure at a vacuum of 0.09 MPa and 180 °C to remove low-boiling fractions, obtaining phenyl long-chain alkyl fluorosilicone oil. The product is a pale yellow transparent liquid, and the number of repeating units in its structure are x = 5, y = 0, z = 8, and w = 4 respectively.

[0056] In this comparative example, octamethylcyclotetrasiloxane was not added, which is equivalent to the case where y = 0 in the structure of the phenyl long-chain alkyl fluorosilicone oil described above. The extreme pressure performance of this product was measured (in accordance with GB / T 3142). The instrument stopped rotating after running for 5 s, the friction coefficient was too high, the performance was poor, and the wear scar diameter could not be measured.

[0057] Performance detection

[0058] The final products in Comparative Example 1 and Examples 1 to 3 were respectively mixed with base oils polyalphaolefin (PAO 8), trimellitate (RJ-1417), and Group II mineral oil to test the compatibility of phenyl long-chain alkyl fluorosilicone oil with the base oils. The addition amount of the three base oils was 20 wt% of the total mass of phenyl long-chain alkyl fluorosilicone oil, and the test results are shown in Table 1.

[0059] The thermal stability of the final products in Examples 1 to 3 was determined by the TGA method, and the temperature point (T(5%)) at which the mass loss was 5 wt% was used as the basis for thermal stability.

[0060] To the phenyl long-chain alkyl fluorosilicone oil prepared in Examples 1 to 3, 20 wt% of RJ-1417 and 2 wt% of T306 extreme pressure and anti-wear agent were added, and the extreme pressure performance of the whole system was measured (carried out according to GB / T3142), and the test results are shown in Table 2.

[0061] Table 1 Compatibility of phenyl long-chain alkyl fluorosilicone oil with base oils

[0062]

[0063]

[0064] Table 2 Thermal stability and lubricity of phenyl long-chain alkyl fluorosilicone oil

[0065]

[0066] In summary, by comparing the compatibility results of phenyl long-chain alkyl fluorosilicone oil with base oils in Table 1, it was found that in Comparative Example 1, tetramethyltetrahydrocyclotetrasiloxane was not added, and the compatibility of the product with several base oils was poor. However, after adding tetramethyltetrahydrocyclotetrasiloxane in Examples 1 to 3, it had good compatibility with several base oils. It can be seen that the introduction of long-chain alkyls can improve the compatibility of silicone oil with base oils. As can be seen from Table 2, the increase in phenyl content will improve the thermal stability of phenyl long-chain alkyl fluorosilicone oil, and the lubricating performance of phenyl long-chain alkyl fluorosilicone oil increases with the increase in the content of trifluoropropyl chain segments.

[0067] The above embodiments are the preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and shall be included in the protection scope of the present invention.

Claims

1. A phenyl-containing long-chain alkyl fluorosilicone oil, characterized in that: The structural formula is as follows: Among them, R F is a fluorinated alkyl group; R ph is phenyl or substituted phenyl; R1 and R2 are the same or different and are methyl, phenyl, dodecyl or vinyl; R3, R4, R5, R6, R7 and R8 are the same or different and are C1-C12 alkyl; x is an integer of 1-10; y is an integer of 1-50; z is an integer of 1-10; and w is an integer of 1-10.

2. The phenyl-containing long-chain alkyl fluorosilicone oil according to claim 1, characterized in that: x is 1 to 2; y is 14 to 20; z is 2 to 3; w is 1 to 2; and / or, R F is trifluoropropyl; R ph is phenyl; R1 and R2 are methyl and dodecyl respectively; R3, R4, R5 and R6 are all methyl; R7 and R8 are methyl and dodecyl respectively.

3. The phenyl-containing long-chain alkyl fluorosilicone oil according to claim 1, characterized in that: x is 1~2; y is 14~18; z is 2~3; w is 1~2.

4. The method for preparing the phenyl-containing long-chain alkyl fluorosilicone oil according to any one of claims 1 to 3, characterized in that: The following steps are involved: (1) heating an alkyl phenyl-containing hydroxyl-terminated silicone oil, an alkyl fluorine-containing cyclotrisiloxane, a tetraalkyl tetrahydrocyclotetrasiloxane, an octaalkyl cyclotetrasiloxane and a capping agent under the action of a catalyst to obtain a phenyl-containing fluorosilicone oil containing a silicon-hydrogen structure; (2) A phenyl-containing fluorosilicone oil having a silicon-hydrogen structure is subjected to a catalytic addition reaction with a long-chain olefin to obtain a phenyl-containing long-chain alkyl fluorosilicone oil.

5. The preparation method according to claim 4, characterized in that: In the alkyl phenyl-terminated hydroxyl silicone oil of step (1), the alkyl group is a C1-C12 alkyl group, and the phenyl-containing group is a phenyl group or a substituted phenyl group; And / or, in the alkyl fluorine-containing cyclotrisiloxane of step (1), the alkyl group is a C1-C12 alkyl group; the carbon chain length of the fluorine-containing group is C1-C12; and / or, in the tetraalkyltetrahydrocyclotetrasiloxane of step (1), the alkyl group is a C1-C12 alkyl group; And / or, in the octaalkylcyclotetrasiloxane of step (1), the alkyl group is a C1-C12 alkyl group; And / or, the molar ratio of the alkyl phenyl-terminated hydroxyl silicone oil, alkyl fluorinated cyclotrisiloxane, tetraalkyltetrahydrocyclotetrasiloxane and octaalkylcyclotetrasiloxane in step (1) is x / n:z / 3:w / 4:y / 4, wherein x is an integer of 1 to 10, y is an integer of 1 to 50, z is an integer of 1 to 10, and w is an integer of 1 to 10; the number of repeating units of the alkyl phenyl-terminated hydroxyl silicone oil is n=4 to 15, n≥x and is an integer; x, y, z, w respectively correspond to the number of repeating units of different repeating units in the phenyl-containing long-chain alkyl fluorosilicone oil according to any one of claims 1 to 3.

6. The preparation method according to claim 4 or 5, characterized in that: The alkyl phenyl-terminated hydroxyl silicone oil in step (1) is methyl phenyl-terminated hydroxyl silicone oil; And / or, the alkyl fluorine-containing cyclotrisiloxane in step (1) is methyltrifluoropropylcyclotrisiloxane; And / or, the tetraalkyltetrahydrocyclotetrasiloxane in step (1) is tetramethyltetrahydrocyclotetrasiloxane; And / or, the octaalkylcyclotetrasiloxane in step (1) is octamethylcyclotetrasiloxane.

7. The preparation method according to claim 4 or 5, characterized in that: The end-capping agent in step (1) is disiloxane, and its substituent is at least one of methyl, phenyl, and hydrogen; And / or, the ratio of the molar amount of the end-capping agent in step (1) to the total molar amount of the alkyl phenyl-terminated hydroxyl silicone oil, the alkyl fluorinated cyclotrisiloxane, the tetraalkyltetrahydrocyclotetrasiloxane, and the octaalkylcyclotetrasiloxane is 1:1 to 50; And / or, the catalyst in step (1) is at least one of a strong acid and a macropore strong acid cation exchange resin; the amount of the catalyst added accounts for 1 to 6 phr of the total mass of the reaction system; And / or, the temperature of the heating reaction in step (1) is 50-100° C. and the time is 1-24 hours.

8. The preparation method according to claim 4 or 5, characterized in that: The molar ratio of Si-H in the phenyl-containing fluorosilicone oil containing silicon-hydrogen structure to the double bond in the long-chain olefin in step (2) is 1:1 to 1.5; And / or, the long-chain olefin in step (2) is a C6-C18 olefin, wherein the number of C=C bonds is an integer from 1 to 5; And / or, the temperature of the catalytic addition reaction in step (2) is 50 to 150° C. and the time is 2 to 5 hours; And / or, the catalyst used in the catalytic addition reaction in step (2) is a platinum catalyst; And / or, the amount of the catalyst used is 1 to 6 ppm based on the mass of the reaction system.

9. The preparation method according to claim 7, characterized in that: The end-capping agent is at least one of hexamethyldisiloxane, tetramethyldiphenylsiloxane, dimethyltetraphenyldisiloxane and tetramethyldihydrogensiloxane.

10. Use of the phenyl-containing long-chain alkyl fluorosilicone oil according to any one of claims 1 to 3 in lubrication of mechanical equipment.

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