Base oil light stabilizer and application thereof

Abstract

The invention relates to the field of lubricating oil, and discloses a base oil light stabilizer which comprises 74-76% of base oil; 4 to 6% of zinc dialkyl dithiophosphate; 2-4% of an ethylene-propylene copolymer; 4 to 6 percent of polyalkoxy polyamine; 1-3% of an imidazoline derivative; 4 to 6% of polymethacrylate; and 4 to 6% of polyisobutylene bis-succinimide. The light stability of the oil product is improved by adjusting the ratio of the base oil to the light stabilizer, the transparency and ultraviolet resistance are enhanced by mixing 500N and PAO in a ratio of 1: 1, the antioxidant effectively inhibits oxidation caused by illumination and keeps the oil product clear, and the light stabilizer improves the dispersion stability, prevents aggregation of oxidation products and ensures long-term stability of the oil product. The antioxidant synergistically prolongs the oxidation induction period of the base oil, improves the anti-aging performance under high temperature and oxidation conditions, maintains the physical and chemical properties of the oil product, and has stronger durability.

Description

Technical Field

[0001] The invention relates to the technical field of lubricating oils, in particular to a base oil light stabilizer and application thereof. Background Art

[0002] Lubricating oil is one of the key materials for modern industrial production and mechanical operation. It is widely used in automobile engines, industrial equipment, ships, aviation and other fields, and undertakes multiple functions such as reducing friction, reducing wear, cooling, cleaning and corrosion prevention. The performance of lubricating oil directly affects the operating efficiency and service life of the equipment, especially under harsh working conditions such as high temperature, high pressure and extreme load. The stability of lubricating oil is crucial. Therefore, with the continuous improvement of the degree of mechanization, more stringent requirements are placed on the quality of lubricating oil.

[0003] As the main component of lubricating oil, the quality and performance of base oil play a decisive role in the overall performance of lubricating oil. Base oil accounts for more than 70% of the total amount of lubricating oil and is the basis of lubricating oil performance. Base oil is usually divided into mineral base oil, synthetic base oil and vegetable base oil. Among them, hydrogenated base oil is widely used in the production of high-performance lubricating oil due to its good stability and antioxidant properties. However, hydrogenated base oil is prone to chemical changes when exposed to light or ultraviolet rays, which is manifested as a gradual change in color from transparent to light yellow, red, and even precipitation. This light-induced discoloration and precipitation not only affects the appearance and sensory quality of the lubricating oil, but more importantly, it may indicate that the chemical structure of the base oil has been degraded, which in turn affects the lubricating and antioxidant properties of the lubricating oil and shortens the service life of the lubricating oil.

[0004] Poor light stability is one of the main problems of lubricant base oils. During the long-term operation of the equipment, the lubricant is inevitably exposed to natural light or strong ultraviolet rays, especially in high temperature environments, the degradation rate of the base oil will be significantly accelerated. Under the action of light, the hydrocarbon compounds of the base oil are prone to free radical reactions to generate peroxides and oxidation products. These oxidation products will not only cause the color of the base oil to change, but also further accelerate the degradation process of the base oil, causing the lubricant to lose its original performance, increase the risk of wear, corrosion and carbon deposition, and ultimately lead to equipment failure or reduced efficiency.

[0005] At present, the common solution to the light stability problem of base oil is to add antioxidants and UV absorbers to the base oil in an attempt to delay the oxidation reaction caused by light. Common antioxidants include butylated hydroxytoluene (BHT) and amine antioxidants, while commonly used UV absorbers include benzophenones and hydroxybenzoates. These additives can slow down the oxidation process of the base oil to a certain extent and delay the discoloration of the oil. However, this type of additive has the following significant limitations:

[0006] Limited light stabilization effect: Although traditional antioxidants and UV absorbers have a certain inhibitory effect on photooxidation in the short term, the effects of these additives are often difficult to sustain when the base oil is exposed to strong light or UV for a long time. Especially under high temperature or harsh working conditions, the oxidation reaction of the base oil will accelerate, and the protective effect of traditional additives is insufficient to effectively extend the service life of the base oil.

[0007] The precipitation problem is difficult to solve: The discoloration of base oil caused by light is usually accompanied by the formation of precipitation, which not only reduces the transparency of the oil, but also may cause the oil to clog the filter or pipeline, thus affecting the normal operation of the equipment. Traditional antioxidants and UV absorbers mainly act on the inhibition of photooxidation reactions, and it is difficult to effectively control the formation of precipitation. The formation of precipitation means that some components in the base oil have undergone irreversible chemical changes, resulting in the deterioration of oil performance.

[0008] Compatibility issues between additives: Modern lubricants often need to have multiple properties at the same time, including antioxidant, anti-wear, anti-corrosion, etc., so multiple additives are needed to work together. However, compatibility issues between different additives are relatively common. Some antioxidants may lose their activity under high temperature conditions, or react with other additives, reducing the stability of the overall formula. This interaction complicates the formulation design, increases production costs, and may cause unexpected performance degradation of the oil during use.

[0009] Complex ingredients and rising costs: The use of traditional antioxidants and UV absorbers often requires a high addition amount, and the combined use of multiple additives may further increase the complexity of the formula, leading to an increase in production costs. In addition, the high dosage of additives may have an adverse effect on other physical and chemical properties of the base oil (such as viscosity, fluidity, volatility, etc.), affecting the overall performance of the oil.

[0010] Therefore, the present invention proposes a base oil light stabilizer and application thereof to solve the deficiencies of the prior art. Summary of the invention

[0011] In view of the deficiencies of the prior art, the present invention provides a base oil light stabilizer and application thereof. The light stabilizer can significantly improve the color stability, oxidation resistance and dispersibility of the base oil under light conditions, reduce the generation of precipitation, and extend the service life of the base oil through scientific proportioning and reasonable selection of multiple components.

[0012] To achieve the above object, the present invention is implemented by the following technical scheme: a base oil light stabilizer comprises the following components in percentage by mass:

[0013] Base oil: 74-76%;

[0014] Zinc dialkyl dithiophosphate: 4-6%;

[0015] Ethylene-propylene copolymer: 2-4%;

[0016] Polyalkoxy polyamine: 4-6%;

[0017] Imidazoline derivatives: 1-3%;

[0018] Polymethacrylate: 4-6%;

[0019] Polyisobutylene bisbutyrimide: 4-6%.

[0020] The selection and proportion of the above components are based on the different action mechanisms and synergistic effects of each component in the base oil. Through scientific formula design, the base oil can remain stable under various effects such as light, thermal oxidation, and mechanical shear. Among them, the base oil acts as a carrier to provide good fluidity and lubricity; zinc dialkyl dithiophosphate acts as a high-efficiency antioxidant that can capture free radicals and inhibit chain oxidation reactions; ethylene-propylene copolymer can increase the viscosity index of the base oil and improve its stability at high temperatures; polyalkoxy polyamine captures excess free radicals through its active amine groups; imidazoline derivatives further enhance the corrosion resistance of the base oil; polymethacrylate can prevent the aggregation of oxidation products in the base oil to form precipitation; polyisobutylene bisbutyrimide ensures the uniform distribution of each component in the oil by improving dispersion stability.

[0021] Preferably, the base oil includes 500N base oil and PAO (poly alpha olefin), and the mass ratio of 500N base oil to PAO is 1:1.

[0022] 500N base oil is a mineral oil with a high viscosity index and good oxidation stability and lubricity. PAO (polyalphaolefin) is a synthetic base oil with excellent low temperature fluidity and high temperature stability. By mixing 500N base oil with PAO in a 1:1 ratio, the viscosity-temperature characteristics and oxidation resistance of the base oil can be significantly improved, while the low temperature fluidity and thermal stability of the base oil can be improved, thereby meeting the stability performance requirements of industrial lubricants and automotive lubricants in high and low temperature environments.

[0023] Preferably, the ester oil is a combination of two components in the ester base oil, including a mixture of diisooctanoate and pentaerythritol tetraisooctanoate.

[0024] Diisooctanoate has excellent antioxidant and heat resistance stability, while pentaerythritol tetraisooctanoate can improve the lubricity and anti-wear properties of oils due to its tetrafunctional structure. The reasonable combination of these two ester oils can significantly improve the light stability and lubricity of the base oil, while enhancing the antioxidant and anti-wear properties of the oil.

[0025] Preferably, the amount of the light stabilizer added is 100-500 ppm.

[0026] When the amount of light stabilizer added is within the range of 100-500ppm, the stability of the base oil under light conditions can be significantly improved. If the amount added is too low, the light stabilization effect cannot be effectively exerted; and if the amount added is too high, other physical and chemical properties of the base oil (such as viscosity, fluidity, volatility, etc.) may be adversely affected. By optimizing the amount added, the light stabilizer of the present invention can achieve good effects under low addition conditions, ensuring the economy and performance of the oil.

[0027] Preferably, the preparation method of the base oil light stabilizer comprises the following steps:

[0028] S1. Mixing base oil, zinc dialkyl dithiophosphate, ethylene-propylene copolymer, polyalkoxy polyamine, imidazoline derivative, polymethacrylate and polyisobutyrimide in proportion;

[0029] S2. In the temperature range of 20-80° C., the components are uniformly mixed by stirring to form the base oil light stabilizer.

[0030] The components in the preparation method are mixed in proportion and mixed under appropriate temperature and stirring conditions to ensure uniform distribution of the light stabilizer. Reasonable temperature control and stirring rate can not only ensure the full dissolution of the components, but also avoid the degradation of some active ingredients by high temperature. The light stabilizer prepared by this method can maintain good uniform dispersion in the base oil, ensuring the stabilization effect of long-term use.

[0031] Preferably, the stirring step lasts for 30-60 minutes, and the stirring speed is 300-800 rpm.

[0032] Within this temperature and stirring speed range, the components of the light stabilizer can be evenly dispersed and stably exist. Stirring time that is too short or speed that is too low may lead to uneven mixing of the components, while too high a stirring rate and too long a stirring time may cause degradation or solubility problems of certain components, thus affecting the overall performance of the light stabilizer.

[0033] Preferably, the polyalkoxy polyamine is a derivative of a polyol amine polyether, and contains at least one primary amine or secondary amine group in its molecular structure, including N-alkoxypropyl-diol amine polyether.

[0034] The primary or secondary amine groups in polyalkoxy polyamines have strong free radical capture capabilities and can effectively inhibit the photooxidation reaction of base oils. In addition, the long-chain structure of polyol amine polyethers gives them good solubility and dispersibility in base oils, which can synergistically improve the antioxidant properties and light stability of base oils.

[0035] Preferably, the molecular structure of the imidazoline derivative contains at least one alkyl substituent, and the carbon number of the alkyl substituent is C12-C18.

[0036] The long-chain alkyl substituents (C12-C18) of imidazoline derivatives can form a dense hydrophobic protective film on the metal surface, thereby improving the corrosion resistance of the base oil. In addition, imidazoline derivatives can further enhance the antioxidant properties of the base oil and extend the service life of the lubricant.

[0037] Preferably, the number average molecular weight of the polyisobutylene bisbutyrimide is 800 to 1500.

[0038] As a highly efficient dispersant, polyisobutylene bisbutyrimide can effectively disperse oxidation products and insoluble particles in base oil and prevent the formation of precipitation. Polyisobutylene bisbutyrimide with a number average molecular weight ranging from 800 to 1500 has good dispersibility and antioxidant stability, ensuring that the base oil maintains high transparency and stability during long-term use.

[0039] Preferably, the light stabilizer is used in industrial lubricants, automotive lubricants, or other petroleum products.

[0040] The light stabilizer of the present invention can be widely used in a variety of lubricating oil products, and can significantly improve the light stability, antioxidant performance and corrosion resistance of the oil products at a relatively low addition amount, thereby extending the service life of the lubricating oil and meeting the needs of various application occasions such as industrial equipment and automobile engines.

[0041] The present invention provides a base oil light stabilizer and its application, which has the following beneficial effects:

[0042] 1. The present invention achieves significant light stability of the base oil under light conditions by finely blending the base oil and light stabilizer components. The 500N and PAO (poly alpha-olefin) in the base oil are mixed in a ratio of 1:1, so that the oil product has excellent performance in terms of transparency and resistance to ultraviolet radiation. In addition, the introduction of antioxidants such as zinc dialkyl dithiophosphate and polyalkoxy polyamine can effectively inhibit the oxidation reaction caused by light, reduce the phenomenon that the oil product changes from transparent to light yellow and red under light, and ensure that the oil product remains clear for a long time. At the same time, the light stabilizer effectively prevents the aggregation and precipitation of oxidation products by improving the dispersion stability of the components in the base oil, and maintains the long-term purity and stability of the base oil.

[0043] 2. In the present invention, the synergistic effect of the antioxidant components significantly prolongs the oxidation induction period of the base oil. Zinc dialkyl dithiophosphate, as an antioxidant, can capture free radicals at the early stage of the oxidation reaction, reduce the progress of the oxidation chain reaction, and thus protect the integrity of the molecular structure of the oil product. The active amine groups in the polyalkoxy polyamine further absorb and neutralize excess free radicals, thereby improving the overall antioxidant properties of the light stabilizer. This multi-component joint protection mechanism significantly improves the anti-aging performance of the base oil under harsh conditions such as high temperature and oxidation, so that the oil product can still maintain its original physical and chemical properties during long-term use, and has stronger durability.

[0044] 3. The present invention significantly improves the corrosion resistance of the base oil by adding imidazoline derivatives to the formula. The unique structure of imidazoline derivatives can form a dense protective film on the metal surface, effectively reducing the corrosion of acidic substances, oxides and other corrosive media on the metal. Its long-chain alkyl substituents with carbon numbers of C12-C18 can provide excellent hydrophobicity and stability, so that the base oil can still maintain good lubrication properties under harsh working conditions. In addition, through the reasonable ratio of ethylene-propylene copolymer and polymethacrylate, the stability of the viscosity of the base oil with temperature changes is greatly improved, and the viscosity index is enhanced. This effect can effectively maintain the lubrication properties of the oil in high or low temperature environments, and has stronger adaptability.

[0045] 4. The base oil light stabilizer of the present invention adopts a scientific ratio of multiple high-efficiency components in the formula design, so that the addition amount of the light stabilizer is only 100-500ppm to achieve a significant effect. The design of low addition amount not only helps to maintain the physical and chemical properties of the base oil, but also greatly reduces production costs and improves economic benefits. In addition, the formula of the light stabilizer can be flexibly adjusted according to the performance requirements of different types of lubricating oil products. It is suitable for traditional fields such as industrial lubricating oil and automotive lubricating oil, and is also suitable for light stabilization treatment in other petroleum products, and has good versatility and application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 The present invention is a flow chart of the preparation method of the base oil light stabilizer. DETAILED DESCRIPTION

[0047] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Please see attached Figure 1 :

[0049] Embodiment 1:

[0050] Formula composition (mass percentage):

[0051] Base oil: 500N and PAO (1:1 mass ratio), 75%

[0052] Zinc dialkyl dithiophosphate: 5%

[0053] Ethylene-propylene copolymer: 3%

[0054] Polyalkoxy polyamine: 5%

[0055] Imidazoline derivatives: 2%

[0056] Polymethacrylate: 5%

[0057] Polyisobutylene bisbutyrimide: 5%

[0058] Preparation process:

[0059] Raw material preparation: Mix 500N base oil and PAO (poly alpha olefin) in a ratio of 1:1 to form a uniform base oil mixture. Weigh each of the above components separately to ensure the accuracy of the formula ratio.

[0060] Component mixing: under room temperature, zinc dialkyl dithiophosphate, ethylene-propylene copolymer, polyalkoxy polyamine, imidazoline derivative, polymethacrylate and polyisobutylene bisbutyrimide are gradually added to the base oil mixture in sequence.

[0061] Temperature control and stirring: Heat the mixture to 60°C and keep stirring at this temperature. The stirring speed is set to 600 rpm and the stirring time is 45 minutes. This process ensures complete dissolution and uniform dispersion of each component.

[0062] Cooling and standing: After stirring, the mixture is cooled to room temperature and stood for 24 hours to allow the components inside the light stabilizer to fully combine and obtain a uniform base oil light stabilizer.

[0063] Implementation effect: In this embodiment, the component ratio and process parameters are set within the recommended range. The experimental results show that the light stabilizer of this formula has excellent light stability and antioxidant properties. Under long-term light conditions, the oil maintains a high transparency, and the amount of sediment generated is extremely small, and the viscosity change is also kept within a small range.

[0064] Embodiment 2:

[0065] Formula composition (mass percentage):

[0066] Base oil: 500N and PAO (1:1 mass ratio), 76%

[0067] Zinc dialkyl dithiophosphate: 3%

[0068] Ethylene-propylene copolymer: 1%

[0069] Polyalkoxy polyamine: 3%

[0070] Imidazoline derivatives: 1%

[0071] Polymethacrylate: 3%

[0072] Polyisobutylene bisbutyrimide: 3%

[0073] Preparation process:

[0074] Raw material preparation: Weigh each component according to the above proportions.

[0075] Component mixing: Add each component to the base oil in turn, controlling the addition speed to reduce local concentration differences.

[0076] Temperature control and stirring: The mixture was heated to 40°C and stirred at 300 rpm for 30 minutes at this temperature. This lower temperature and speed may result in less uniform dispersion between the components.

[0077] Cooling and standing: After stirring, cool to room temperature and stand for 24 hours.

[0078] Implementation effect: The light stabilizer, component content and process conditions in this example are all lower than the recommended range. The experimental results show that the light stability of this formula is poor. In the light test, the color of the oil changes significantly, the antioxidant capacity decreases, and more precipitation is generated. This shows that too low component content and process conditions will lead to insufficient product performance.

[0079] Embodiment 3:

[0080] Formula composition (mass percentage):

[0081] Base oil: 500N and PAO (1:1 mass ratio), 74%

[0082] Zinc dialkyl dithiophosphate: 6%

[0083] Ethylene-propylene copolymer: 4%

[0084] Polyalkoxy polyamine: 6%

[0085] Imidazoline derivatives: 3%

[0086] Polymethacrylate: 6%

[0087] Polyisobutylene bisbutyrimide: 6%

[0088] Preparation process:

[0089] Raw material preparation: Weigh each component according to the above proportions.

[0090] Mixing of components: Add each component in order to the mixing container, stirring to ensure dissolution and uniform dispersion.

[0091] Temperature control and stirring: Heat the mixture to 80°C and stir at 800 rpm for 60 minutes. Higher temperatures and stirring speeds may cause some components to decompose or become ineffective.

[0092] Cooling and Standing: After stirring is complete, the mixture is cooled to room temperature and allowed to stand for 24 hours.

[0093] Implementation effect: Although the formula and process parameters of the light stabilizer in this example are higher than the recommended range, the performance of the light stabilizer is not significantly improved. High temperature and long-term stirring lead to the degradation of some components, which in turn reduces the stability of the light stabilizer, indicating that excessive components and excessively strict process conditions will affect the effect of the light stabilizer.

[0094] Comparative experiment:

[0095] Comparative experiment 1: Comparative experiment of photostability

[0096] Existing technical solutions:

[0097] Formula composition: base oil 75%, antioxidant (BHT) 5%, thickener (polymethacrylate) 10%, dispersant 10%.

[0098] Preparation process: Stir at 50°C for 30 minutes at a stirring speed of 500 rpm.

[0099] Experimental process:

[0100] Sample preparation: The base oil samples treated with the light stabilizer of the prior art and the present invention are respectively placed in transparent glass tubes and sealed for storage.

[0101] Light test: Place the sample tube under a UV lamp for a simulated light test for 200 hours, and regularly record the color change and precipitation of the oil.

[0102] Result analysis: Check the color change and transparency of the control sample, and record the amount of precipitation generated.

[0103] Experimental results:

[0104] The color of the base oil sample of the prior art gradually changes from transparent to red, and obvious precipitation occurs.

[0105] The base oil treated with the light stabilizer of the present invention has only a slight change in color, remains light yellow, and has no obvious precipitation.

[0106] Comparative analysis: The existing technology mainly relies on the antioxidant effect of BHT, but it cannot effectively resist the photo-oxidation reaction caused by ultraviolet rays. The zinc dialkyl dithiophosphate and imidazoline derivatives introduced in the present invention have significant effects in resisting ultraviolet rays and preventing the generation of free radicals, thus showing better photostability.

[0107]

[0108]

[0109] Comparative experiment 2: Comparative experiment of antioxidant performance

[0110] Existing technical solutions:

[0111] Formula composition: base oil 70%, antioxidant (amine) 8%, dispersant (polyisobutylene amine) 12%, thickener 10%.

[0112] Preparation process: Stir at 60°C for 40 minutes at a stirring speed of 400 rpm.

[0113] Experimental process:

[0114] Sample preparation: The base oil samples treated with the light stabilizer of the prior art and the present invention are respectively placed in sealed containers.

[0115] Accelerated oxidation test: An oxidation test is conducted for 300 hours in an accelerated oxidation test chamber at 100°C, with the oxidation induction period, viscosity change of the oil and the amount of sedimentation measured regularly.

[0116] Result analysis: Compare various indicators of samples during the oxidation process.

[0117] Experimental results:

[0118] The oxidation induction period of the base oil in the prior art is 300 hours, a large amount of precipitation is generated, and the viscosity changes significantly.

[0119] The oxidation induction period of the base oil treated with the light stabilizer of the present invention is extended to 600 hours, and the precipitation amount and viscosity change are both small.

[0120] Comparative analysis: The antioxidants in the prior art have limited ability to capture free radicals, while the synergistic effect of zinc dialkyl dithiophosphate and polyalkoxy polyamine in the present invention greatly improves the inhibitory effect on free radicals, thereby significantly prolonging the oxidation induction period of oil products.

[0121] formula Oxidation induction period (hours) Sedimentation amount (mg / L) Viscosity change (%) Light stabilizer of the present invention 600 10 5 Prior art 300 30 20

[0122] Comparative experiment 3: Comparative experiment of corrosion resistance and adaptability

[0123] Existing technical solutions:

[0124] Formula composition: base oil 70%, preservative (imidazoline) 10%, antioxidant (amine) 10%, thickener 10%.

[0125] Preparation process: Stir at 50°C for 35 minutes at a stirring speed of 400 rpm.

[0126] Experimental process:

[0127] Preparation of metal test pieces: The light stabilizers of the prior art and the present invention are coated on standard metal test pieces respectively.

[0128] Corrosion test: Place the test piece in a corrosive gas environment (such as H2S and SO2) for 200 hours and measure the corrosion depth of the test piece.

[0129] Adaptability test: At different temperatures, measure the viscosity change of the light stabilizer, calculate the viscosity index, and evaluate its adaptability.

[0130] Result analysis: Compare the protection effect and viscosity stability of the two samples in a corrosive environment.

[0131] Experimental results:

[0132] The oil products in the prior art have poor protective effects on metal surfaces, have large corrosion depths, and their viscosity index varies significantly at different temperatures.

[0133] The light stabilizer of the present invention forms a denser protective film, significantly reduces the corrosion depth of the metal, and simultaneously maintains a stable viscosity under different temperature conditions.

[0134] Comparative analysis: The preservatives in the prior art mainly rely on the protective effect of a single imidazoline substance, while the imidazoline derivatives in the present invention work synergistically with other components to not only provide stronger hydrophobic protection, but also improve corrosion resistance and adaptability by enhancing dispersion stability.

[0135] formula Corrosion depth (μm) Viscosity Index Metal surface protection rate (%) Light stabilizer of the present invention 10 150 95 Prior art 50 120 60

[0136] Summary:

[0137] Through three examples and three comparative experiments, the significant advantages of the light stabilizer of the present invention in terms of light stability, oxidation resistance, corrosion resistance and adaptability can be fully demonstrated. The components and process parameters of Example 1 are set within the optimal range, and excellent comprehensive performance is obtained, while Examples 2 and 3 show that when the components or process parameters deviate from the reasonable range, the performance will be significantly reduced.

[0138] Through comparative experiments, we have verified that the technical solution of the present invention is a significant improvement over the prior art: the stability of the oil under light conditions is significantly enhanced, and it remains clear and transparent for a long time; under high-temperature accelerated oxidation conditions, the oxidation induction period is significantly prolonged and precipitation generation is reduced; in a corrosive environment, the dense protective film formed by the present invention effectively reduces the corrosion depth of the metal.

[0139] In addition, the light stabilizer of the present invention exhibits stable viscosity under different temperature conditions and has high adaptability. These technical improvements and performance enhancements provide a solid technical foundation for the wide application of the base oil light stabilizer of the present invention in industrial lubricants, automotive lubricants and other petroleum products.

[0140] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A base oil light stabilizer, characterized in that: It contains the following components in percentage by mass: Base oil: 74-76%; Zinc dialkyl dithiophosphate: 4-6%; Ethylene-propylene copolymer: 2-4%; Polyalkoxy polyamine: 4-6%; Imidazoline derivatives: 1-3%; Polymethacrylate: 4-6%; Polyisobutylene bisbutyrimide: 4-6%.

2. The base oil light stabilizer according to claim 1, characterized in that: The base oil includes 500N base oil and PAO (poly alpha olefin), and the mass ratio of 500N base oil to PAO is 1:

1.

3. The base oil light stabilizer according to claim 1, characterized in that: The ester oil is a composition of two components in the ester base oil, including a mixture of diisooctanoate and pentaerythritol tetraisooctanoate.

4. The base oil light stabilizer according to claim 1, characterized in that: The amount of the light stabilizer added is 100-500ppm.

5. The method for preparing the basic oil light stabilizer according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Mixing base oil, zinc dialkyl dithiophosphate, ethylene-propylene copolymer, polyalkoxy polyamine, imidazoline derivative, polymethacrylate and polyisobutyrimide in proportion; S2. In the temperature range of 20-80° C., the components are uniformly mixed by stirring to form the base oil light stabilizer.

6. The method for preparing the basic oil light stabilizer according to claim 5, characterized in that: The stirring step lasts for 30-60 minutes, and the stirring speed is 300-800 rpm.

7. The method for preparing the basic oil light stabilizer according to claim 5, characterized in that: The polyalkoxy polyamine is a derivative of polyol amine polyether, and contains at least one primary amine or secondary amine group in its molecular structure, including N-alkoxypropyl-diol amine polyether.

8. The method for preparing the basic oil light stabilizer according to claim 5, characterized in that: The molecular structure of the imidazoline derivative contains at least one alkyl substituent, and the carbon number of the alkyl substituent is C12-C18.

9. The method for preparing the basic oil light stabilizer according to claim 1, characterized in that: The number average molecular weight of the polyisobutylene bisbutyrimide is 800 to 1500.

10. The base oil light stabilizer according to any one of claims 1 to 9, characterized in that: The light stabilizer is used in industrial lubricating oil, automotive lubricating oil, or other petroleum products.

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