Silicon-based shock absorber oil for racing cars and method for producing the same

Abstract

The application belongs to the technical field of shock absorber oil, and particularly relates to a silicon-based shock absorber oil for racing cars and a preparation method thereof. The silicon-based shock absorber oil for racing cars comprises, by mass percentage, 50-60 parts of silicone oil, 40-50 parts of base oil, 3-6 parts of a viscosity index improver, 0.2-0.5 parts of an extreme pressure anti-wear agent, 0.2-0.5 parts of a pour point depressant, and 0.2-0.5 parts of an antioxidant. The extreme pressure anti-wear agent comprises thiazolyl disulfide dimers and poly-methyl acrylate modified nanoscale spherical boron nitride. The silicon-based shock absorber oil for racing cars has excellent viscosity-temperature performance, shear stability, heat resistance, wear resistance, corrosion resistance and high-temperature foam resistance.

Description

Technical Field

[0001] This invention belongs to the field of shock absorber oil technology, specifically relating to a silicon-based shock absorber oil for racing cars and its preparation method. Background Technology

[0002] When racing cars are on the track, they encounter various complex road conditions and the impact of high speeds. Shock absorbers play a crucial role, effectively filtering out most of the bumps generated by the springs and ensuring comfort inside the car. Shock absorber oil plays a dual role in the shock absorber. It not only converts the kinetic energy generated when the spring is compressed into heat and dissipates it, but also provides predictable damping for the shock absorber. High-quality shock absorber oil is extremely important for the performance of the shock absorber, allowing it to maintain good performance under extreme driving conditions and adapt to large temperature changes.

[0003] Racing shock absorber oils need to have good anti-wear properties, good low-temperature fluidity, good oxidation resistance, good durability, and low foaming properties.

[0004] Chinese patent CN 109266424 A discloses a lubricating oil for a hydraulic system of an off-road vehicle shock absorber and its preparation method. The lubricating oil is composed of 70-80 parts of low-viscosity paraffinic base oil, 15-25 parts of polymethyl methacrylate thickener, 1-2 parts of high-temperature ashless anti-wear hydraulic oil composite agent, 0.2-0.6 parts of polyα-olefin pour point depressant, 0.2-0.6 parts of polymethyl methacrylate pour point depressant, and 0.001-0.03 parts of defoamer. The lubricating oil of this technical solution has a high viscosity index, but it does not pay attention to high-temperature foaming performance.

[0005] Chinese Patent Publication No. CN115340897B discloses a shock absorber oil composition and its application. Based on the weight of the shock absorber oil composition, it comprises the following components: a) 50–95 wt% of a synthetic oil produced by the Fischer-Tropsch reaction; the synthetic oil produced by the Fischer-Tropsch reaction has a carbon atom number of C12–C40; b) 3–15 wt% of a viscosity index improver; c) 0.5–5 wt% of an anti-wear agent; d) 0.2–5 wt% of a friction modifier; e) 0.1–2 wt% of a pour point depressant; f) 0.1–2 wt% of an antioxidant; g) 0.01–2 wt% of a detergent; h) 0.01–2 wt% of a rust inhibitor; j) 0.01–1 wt% of a metal deactivator; k) 0.001–0.05 wt% of an antifoaming agent; the kinematic viscosity of the shock absorber oil composition at 100°C is not less than 3 mmHg. 2 / s; The shock absorber oil composition of this technical solution has excellent low-temperature performance, excellent high-temperature stability, excellent friction reduction and anti-wear properties, good oxidation resistance, excellent anti-foaming properties and reasonable cost. However, it has a large shear loss and does not focus on durability. Summary of the Invention

[0006] The present invention aims to solve one or more technical problems existing in the prior art, and at least provide a beneficial solution. Specifically, the present invention provides a silicon-based shock absorber oil for racing cars and a method for preparing the same, which has excellent viscosity-temperature properties, shear stability, thermal stability, wear resistance, corrosion resistance, and high-temperature anti-foaming properties.

[0007] This invention is achieved through the following technical solution:

[0008] On the one hand, the present invention provides a silicon-based shock absorber oil for racing cars, comprising, by weight percentage, 50-60 parts silicone oil, 40-50 parts base oil, 3-6 parts viscosity index improver, 0.2-0.5 parts extreme pressure anti-wear agent, 0.2-0.5 parts pour point depressant, and 0.2-0.5 parts antioxidant;

[0009] The extreme pressure anti-wear agent comprises thiadiazole dimer and polymethyl methacrylate modified nanoscale spherical boron nitride.

[0010] This invention selects thiadiazole dimer and polymethyl methacrylate-modified nano-sized spherical boron nitride as extreme pressure anti-wear agents: Firstly, the thiadiazole dimer forms a strongly adsorbed protective film on the metal surface, and the polymethyl methacrylate-modified nano-sized spherical boron nitride acts as a miniature ball bearing between friction pairs, thus synergistically improving the anti-wear performance of silicon-based shock absorber oil; secondly, the thiadiazole dimer can also inhibit metal corrosion and, in synergy with the antioxidant of this invention, improve the oxidation and corrosion resistance of the silicon-based shock absorber oil; thirdly... Polymethyl methacrylate modified nanoscale spherical boron nitride not only ensures the stable existence of nanoscale spherical boron nitride in the system, but also avoids the damage of the friction pair surface by high-hardness spherical boron nitride. Because polymethyl methacrylate modified nanoscale spherical boron nitride has an ultra-hard nanoscale spherical boron nitride core and a flexible polymethyl methacrylate shell, this structure makes the polymethyl methacrylate modified nanoscale spherical boron nitride more stable during friction and has better lubrication, thus giving the silicone-based shock absorber oil excellent anti-wear properties.

[0011] Fourth, the nano-sized spherical boron nitride modified with polymethyl methacrylate can be rapidly adsorbed onto the foam surface, disrupting the liquid film structure of the foam. In conjunction with specific silicone oils, this gives the silicone-based shock absorber oil excellent high-temperature anti-foaming properties.

[0012] Furthermore, the silicone oil includes dimethyl silicone oil, ethyl-modified silicone oil, and alkylbenzene-alkyl-modified silicone oil.

[0013] Furthermore, the mass ratio of the dimethyl silicone oil, ethyl-modified silicone oil, and alkylbenzene-alkyl-modified silicone oil is 80-100:2-4:1.

[0014] This invention selects a mixture of dimethyl silicone oil, ethyl modified silicone oil, and alkylbenzene alkyl modified silicone oil: Firstly, by utilizing the complementary advantages of the three, the silicone-based shock absorber oil has good high and low temperature resistance; secondly, the combination of the three gives the silicone-based shock absorber oil good high-temperature anti-foaming properties; and thirdly, the synergistic effect of alkylbenzene alkyl modified silicone oil and extreme pressure anti-wear agent gives the silicone-based shock absorber oil excellent durability.

[0015] Furthermore, the viscosity of the dimethyl silicone oil is 50-200 mm. 2 / s, 25℃.

[0016] Furthermore, the viscosity of the ethyl-modified silicone oil is 300-400 mm. 2 / s, 25℃.

[0017] Furthermore, the viscosity of the alkylbenzene-alkyl modified silicone oil is 600-900 mm. 2 / s, 25℃.

[0018] Furthermore, the base oil comprises 60N base oil and polyalphaolefin.

[0019] Furthermore, the mass ratio of the 60N base oil to the polyalphaolefin is 1:2-4.

[0020] Furthermore, the viscosity of the polyalphaolefin is 1.7-2.0 mm. 2 / s, 100℃.

[0021] Furthermore, the mass ratio of the thiadiazole dimer to the methyl methacrylate-modified nanoscale spherical boron nitride is 1-2:1-2.

[0022] Further, the preparation method of the polymethyl methacrylate modified nanoscale spherical boron nitride includes the following steps: mixing nanoscale spherical boron nitride, vinyl silane coupling agent and ethanol aqueous solution, adjusting the pH to 3-5, stirring the reaction for the first time, filtering, and washing with water to obtain an intermediate product; mixing the intermediate product, emulsifier and ethanol aqueous solution evenly, adding initiator aqueous solution and methyl methacrylate under stirring conditions, stirring the reaction for the second time, filtering after the reaction is completed, washing, and drying to obtain polymethyl methacrylate modified nanoscale spherical boron nitride.

[0023] Furthermore, the diameter of the said nanosphere boron nitride is 100-500 nm.

[0024] Furthermore, the vinylsilane coupling agent is selected from at least one of vinyltriethoxysilane and vinyltrimethoxysilane.

[0025] Furthermore, the mass ratio of the nanoscale spherical boron nitride, vinyl silane coupling agent, and ethanol aqueous solution is 8-12:0.1-0.2:50.

[0026] Furthermore, the temperature of the first stirring reaction is 20-30℃, and the time is 1-2 hours.

[0027] Furthermore, the emulsifier is fatty alcohol polyoxyethylene ether (AEO9).

[0028] Furthermore, the mass ratio of the intermediate product, emulsifier, and aqueous ethanol solution is 0.8-1.2:0.1-0.3:10.

[0029] Furthermore, the mass concentration of the ethanol aqueous solution is 60-80%.

[0030] Furthermore, the initiator aqueous solution is selected from at least one of ammonium persulfate aqueous solution and potassium persulfate aqueous solution.

[0031] Furthermore, the initiator concentration in the aqueous initiator solution is 8-10%.

[0032] Furthermore, the mass ratio of the intermediate product, initiator, and methyl methacrylate is 1-2:0.5-0.8:3-8.

[0033] Furthermore, the temperature of the second stirring reaction is 80-90℃, and the time is 3-5h.

[0034] Furthermore, the viscosity index improver is a hydrogenated styrene-isoprene copolymer.

[0035] Furthermore, the hydrogenated styrene isoprene copolymer is a multi-arm star-shaped block copolymer.

[0036] In this invention, the presence of polymethyl methacrylate-modified nano-sized spherical boron nitride causes the viscosity of silicon-based shock absorber oil to decrease more easily at high temperatures and results in poor shear stability. Through experimental research, the inventors discovered that only when the viscosity index improver is hydrogenated styrene-isoprene copolymer, and the hydrogenated styrene-isoprene copolymer is a multi-arm star-shaped block copolymer, can the silicon-based shock absorber oil possess good heat resistance and shear stability, effectively preventing the viscosity of the silicon-based shock absorber oil from decreasing due to shearing during high-temperature processes.

[0037] Furthermore, the pour point depressant is polymethacrylate.

[0038] Furthermore, the antioxidant is selected from at least one of N-phenyl-1-naphthylamine, dialkyldiphenylamine, and 2,6-di-tert-butyl-p-cresol.

[0039] On the other hand, the present invention provides a method for preparing racing car shock absorber oil, comprising the following steps: first, stirring silicone oil and base oil evenly, then adding extreme pressure anti-wear agent, pour point depressant, antioxidant, and viscosity index improver and stirring evenly to obtain the final product.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 1. This invention selects thiadiazole dimer and polymethacrylate-modified nano-sized spherical boron nitride as extreme pressure anti-wear agents to improve the anti-wear performance, anti-oxidation performance, anti-corrosion performance and high-temperature anti-foaming performance of silicon-based shock absorber oil;

[0042] 2. This invention selects a mixture of dimethyl silicone oil, ethyl modified silicone oil and alkylbenzene alkyl modified silicone oil to make the silicone-based shock absorber oil have good high and low temperature resistance, high temperature anti-foaming and durability.

[0043] 3. This invention selects hydrogenated styrene isoprene copolymer, and the hydrogenated styrene isoprene copolymer is a multi-arm star-shaped block copolymer as a viscosity index improver, so that the silicon-based shock absorber oil has good high-temperature shear stability and effectively prevents the viscosity of the silicon-based shock absorber oil from decreasing due to shearing during high-temperature processes.

[0044] 4. The racing shock absorber oil of this invention can pass 3 million durability tests, has a long service life, can reduce the frequency of oil changes, and reduce maintenance costs. Attached Figure Description

[0045] Figure 1 This is a SEM image of polymethacrylate-modified nanoscale spherical boron nitride from Example 1 of the present invention;

[0046] Figure 2 This is a test report diagram of the shock absorber oil in Embodiment 2 of the present invention. Detailed Implementation

[0047] To enable those skilled in the art to more clearly understand the technical solutions described in this invention, the following embodiments are provided for illustration. It should be noted that the following embodiments do not constitute a limitation on the scope of protection claimed by this invention.

[0048] Unless otherwise specified, the raw materials, reagents or apparatus used in the following examples and comparative examples are available from conventional commercial sources or can be obtained by existing known methods.

[0049] Example 1

[0050] A racing car silicone-based shock absorber oil, by weight percentage, consists of 50 parts silicone oil, 50 parts base oil, 3 parts viscosity index improver, 0.2 parts extreme pressure anti-wear agent, 0.2 parts pour point depressant, and 0.2 parts antioxidant.

[0051] The silicone oil is a mixture of dimethyl silicone oil, ethyl-modified silicone oil, and alkylbenzene-alkyl-modified silicone oil in a mass ratio of 100:3:1, wherein the viscosity of the dimethyl silicone oil is 100±10 mm. 2 / s, 25℃, sourced from Hubei Kefule Materials Technology Co., Ltd., grade: CFS-F(M)-100; the viscosity of the ethyl-modified silicone oil is 300-400 mm. 2 / s, 25℃, sourced from Jiujiang Runhe Synthetic Materials Co., Ltd., brand: RH-ET-350; alkylbenzene alkyl-modified silicone oil viscosity is 600-900 mm. 2 / s, 25℃, sourced from Jiujiang Runhe Synthetic Materials Co., Ltd., grade: RH-8207K.

[0052] The base oil is 60N base oil and polyalphaolefin in a mass ratio of 1:3.

[0053] The 60N base oil was sourced from Zhongchi New Materials (Guangzhou) Co., Ltd., and the viscosity of the polyalphaolefin was 1.7 mm. 2 / s, 100℃, sourced from Shanghai Daopu Chemical Co., Ltd., model: PAO2.

[0054] The extreme pressure anti-wear agent is a 1:1 mass ratio of thiadiazole dimer and polymethyl methacrylate modified nano-sized spherical boron nitride, wherein the thiadiazole dimer is sourced from Luoyang Pacific United Petrochemical Co., Ltd., model: EPSAIL 8290.

[0055] The preparation method of polymethyl methacrylate modified nanoscale spherical boron nitride is as follows: 10g of nanoscale spherical boron nitride, 0.15g of vinyltriethoxysilane, and 50g of ethanol aqueous solution (mass concentration of 70%) are mixed, the pH is adjusted to 5, and the reaction is carried out with stirring for the first time (temperature of 25℃, time of 2h). After filtration and washing with water, an intermediate product is obtained. 1g of the intermediate product, 0.2g of fatty alcohol polyoxyethylene ether AEO9, and 10g of ethanol aqueous solution (mass concentration of 70%) are mixed evenly. Under stirring conditions, 0.6g of ammonium persulfate aqueous solution (mass concentration of 10%) and 4g of methyl methacrylate are added, and the reaction is carried out with stirring for the second time (temperature of 80℃, time of 3h). After the reaction is completed, the mixture is filtered, washed, and dried to obtain polymethyl methacrylate modified nanoscale spherical boron nitride. Its SEM image is shown below. Figure 1 As shown.

[0056] The nanospheres of boron nitride have a diameter of 100-500 nm and are sourced from Shandong Jingyi New Materials Co., Ltd.

[0057] The viscosity index improver is a hydrogenated styrene-isoprene copolymer, which is a multi-arm star-shaped block copolymer sourced from Zhejiang Zhongli Synthetic Materials Technology Co., Ltd., model number: ZL-D760.

[0058] The pour point depressant is polymethyl methacrylate, sourced from Jinzhou Chenghua New Materials Co., Ltd., model number: T-248.

[0059] The antioxidant is N-phenyl-1-naphthylamine, sourced from Jinzhou Chenghua New Materials Co., Ltd., model number: T531.

[0060] The preparation method of the above-mentioned racing shock absorber oil is as follows: first, stir the silicone oil and base oil evenly, then add extreme pressure anti-wear agent, pour point depressant, antioxidant and viscosity index improver and stir evenly to obtain the final product.

[0061] Example 2

[0062] A racing car silicone-based shock absorber oil differs from Example 1 only in that, by mass percentage, it consists of 60 parts silicone oil, 40 parts base oil, 6 parts viscosity index improver, 0.5 parts extreme pressure anti-wear agent, 0.5 parts pour point depressant, and 0.5 parts antioxidant; all other components are the same.

[0063] Example 3

[0064] A racing car silicone-based shock absorber oil differs from Example 1 only in that, by mass percentage, it consists of 55 parts silicone oil, 45 parts base oil, 5 parts viscosity index improver, 0.4 parts extreme pressure anti-wear agent, 0.4 parts pour point depressant, and 0.4 parts antioxidant; all other components are the same.

[0065] Comparative Example 1

[0066] A racing car silicon-based shock absorber oil differs from Example 2 only in that the polymethyl methacrylate modified nano-sized spherical boron nitride is replaced with an equal mass of nano-sized spherical boron nitride; all other aspects are the same.

[0067] Comparative Example 2

[0068] A racing car silicon-based shock absorber oil differs from Example 2 only in that the thiadiazole dimer is replaced with an equal mass of thiophosphate acrylate derivative, sourced from Luoyang Pacific United Petrochemical Co., Ltd., model: PSAIL 3530; all other aspects are the same.

[0069] Comparative Example 3

[0070] A racing car silicon-based shock absorber oil differs from Example 2 only in that the polymethyl methacrylate-modified nano-sized spherical boron nitride is replaced with an equal mass of polymethyl methacrylate-modified boron nitride nanosheets; all other aspects are the same. The boron nitride nanosheets have a thickness of 10 nm and a diameter of 1-2 µm, and are sourced from Suzhou Napo Materials Technology Co., Ltd., model number: NS-BN. The preparation method of the polymethyl methacrylate-modified boron nitride nanosheets is as follows: 10 g of boron nitride nanosheets, 0.15 g of vinyltriethoxysilane, and 50 g of ethanol aqueous solution (mass concentration 7). Mix 0% (0%), adjust pH to 5, and perform the first stirring reaction (temperature 25℃, time 2h). Filter and wash with water to obtain the intermediate product. Mix 1g of the intermediate product, 0.2g of fatty alcohol polyoxyethylene ether AEO9 and 10g of ethanol aqueous solution (mass concentration 70%) evenly. Under stirring conditions, add 0.6g of ammonium persulfate aqueous solution (mass concentration 10%) and 4g of methyl methacrylate. Perform the second stirring reaction (temperature 80℃, time 3h). After the reaction is completed, filter, wash, and dry to obtain polymethyl methacrylate modified boron nitride nanosheets.

[0071] Comparative Example 4

[0072] A racing car silicon-based shock absorber oil differs from Example 2 only in that the ethyl-modified silicone oil is replaced with an equal mass of long-chain alkyl-modified silicone oil, wherein the long-chain alkyl-modified silicone oil is sourced from Jiujiang Runhe Synthetic Materials Co., Ltd., brand name: RH-8206A; all other aspects are the same.

[0073] Comparative Example 5

[0074] A racing car silicone-based shock absorber oil differs from Example 2 only in that the viscosity index improver is a hydrogenated styrene-isoprene copolymer, which is a linear hydrogenated block copolymer sourced from Zhejiang Zhongli Synthetic Materials Technology Co., Ltd., model number: ZL-M7401; all other aspects are the same.

[0075] Comparative Example 6

[0076] A racing car silicone-based shock absorber oil differs from Example 2 only in that the viscosity index improver is polymethyl methacrylate, sourced from Contec Lubricating Oil Additives Co., Ltd., model: KTV6740; all other aspects are the same.

[0077] Performance Test 1:

[0078] The racing car silicon-based shock absorber oils of Examples 1-3 and Comparative Examples 1-6 were tested as shown in Table 1 below, and the test results are shown in Table 2.

[0079] Table 1

[0080]

[0081] Table 2

[0082]

[0083] Results analysis: Comparison of Example 2 and Comparative Examples 1-3 shows that the polymethyl methacrylate modified nanoscale spherical boron nitride of the present invention can effectively improve wear resistance, heat resistance, shear stability and anti-foaming properties.

[0084] A comparison of Example 2 and Comparative Example 4 shows that the silicone oil provided by the present invention can effectively improve heat resistance, shear stability and anti-foaming properties;

[0085] A comparison of Example 2 and Comparative Examples 5-6 shows that the viscosity index modifier provided by the present invention can effectively improve heat resistance and shear stability.

[0086] Test Example 2

[0087] The racing car silicon-based shock absorber oil from Example 3 was tested, and the test report is as follows: Figure 2 As shown.

[0088] Depend on Figure 2 It can be seen that the racing car silicon-based shock absorber oil provided by the present invention has a high viscosity index and good high and low temperature resistance.

[0089] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A silicon-based shock absorber oil for a race car, characterized by, The silicone oil comprises dimethyl silicone oil, ethyl modified silicone oil and alkyl benzene alkyl modified silicone oil; the base oil comprises 60N base oil and poly-alpha olefin; The viscosity index improver is hydrogenated styrene isoprene copolymer; the hydrogenated styrene isoprene copolymer is a multi-arm star block copolymer; the extreme pressure anti-wear agent comprises thiazole dimer and poly-methyl acrylate modified nano spherical boron nitride; The preparation method of the poly-methyl acrylate modified nano spherical boron nitride comprises the following steps: mixing nano spherical boron nitride, vinyl silane coupling agent and ethanol aqueous solution, adjusting the pH to 3-5, first stirring reaction, filtering, water washing to obtain an intermediate product; uniformly mixing the intermediate product, emulsifier and ethanol aqueous solution, under stirring conditions, adding an initiator aqueous solution and methyl methacrylate, second stirring reaction, filtering, washing and drying after the reaction is completed to obtain the product; the diameter of the nano spherical boron nitride is 100-500 nm. The pour point depressant is poly-methyl acrylate.

2. The silicon-based shock absorber oil for racing cars according to claim 1, characterized by viscosity of 50 to 200 mm 2 / s at 25°C; the ethyl-modified silicone oil has a viscosity of 300 to 400 mm 2 / s at 25°C; the alkyl-modified silicone oil has a viscosity of 600 to 900 mm 2 / s at 25°C.

3. The silicon-based shock absorber oil for racing cars according to claim 1, characterized by The antioxidant is selected from at least one of N-phenyl-1-naphthylamine, dialkyl diphenylamine and 2,6-di-tert-butyl-p-cresol.

4. The silicon-based shock absorber oil for racing cars according to claim 1, characterized by The method comprises the following steps:

5. The method of producing a racing car shock absorber oil according to any one of claims 1 to 4, characterized by, First, the silicone oil and the base oil are stirred uniformly, and then the extreme pressure anti-wear agent, the pour point depressant, the antioxidant and the viscosity index improver are added and stirred uniformly to obtain the product. ​

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