Oil film bearing oil and preparation method thereof

Abstract

The invention relates to the field of lubricating oil, and discloses oil film bearing oil and a preparation method thereof.The method comprises the following steps that 1, a first part of base oil and a demulsifier are subjected to first mixing, and a demulsifier mother solution is obtained; (2) performing second mixing on the second part of base oil, an antioxidant, an extreme pressure anti-wear agent, an anti-rust agent and an anti-foaming agent to obtain a mixture A; and (3) adding the demulsifier mother liquor into the mixture A in batches, and carrying out third mixing to obtain the oil film bearing oil, wherein the demulsifier mother liquor is added from the upper part of the mixture A. According to the invention, the feeding mode of the demulsifier is changed, the demulsifier with high specific gravity is uniformly dispersed in the base oil, and the precipitation of the demulsifier is reduced, so that the demulsification effect of the demulsifier is fully exerted, the quality stability of the oil film bearing oil is improved, and the stable and normal operation of a lubricating system and rolling mill equipment is effectively guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of lubricating oil, in particular to an oil film bearing oil and a preparation method thereof. BACKGROUND

[0002] The oil film bearing oil is a heavy load circulating system lubricating oil with excellent emulsion resistance, wear resistance and rust resistance, mainly applied to high-speed wire and rod rolling mill equipment in the metallurgical industry. Since the oil film bearing oil often faces special harsh conditions such as high-speed bearing and continuous large amount of cooling water, the emulsion resistance becomes a key performance of the oil film bearing oil, and excellent and stable emulsion resistance can realize rapid separation of oil and water, ensuring the normal operation of the lubricating system. Otherwise, the emulsified liquid formed by the cooling water and the oil film bearing oil will lead to the decrease of the oil film strength and the deterioration of the lubricating performance of the oil, causing equipment wear; on the other hand, it is easy to cause corrosion of bearings, gears and other parts.

[0003] Therefore, preparing the oil film bearing oil with excellent and stable emulsion resistance is beneficial to reduce the influence of large amount of water on equipment lubrication under harsh conditions, reduce the occurrence of abnormal equipment wear, and ensure the stable and normal operation of the lubricating system and equipment. Therefore, it is necessary to select a suitable type and amount of demulsifier and uniformly disperse it in the oil to fully play its role and obtain excellent emulsion resistance.

[0004] The blending process of the oil film bearing oil and the functional additive is a basic condition to ensure the production quality level of the oil film bearing oil. At present, the additive is added in a similar way to the base oil, that is, the additive is pumped from the bottom of the blending kettle, and then stirred and mixed in the blending kettle to obtain an oil product with good uniformity.

[0005] CN209791431U discloses a device for blending lubricating oil, which comprises a blending tank, a temperature adjusting agent and a gas stirring mechanism. The temperature adjusting mechanism comprises a heater and a heat conductor connected with each other. The heater is located outside the blending tank, and the heat conductor is located inside the blending tank. The gas stirring mechanism comprises a gas supply mechanism and a gas supply pipeline. The gas inlet end of the gas supply pipeline is connected with the gas supply mechanism, and the gas outlet end is inserted into the inside of the blending tank. The bottom of the blending tank is provided with a finished oil outlet and at least two feed ports. The inside of the blending tank is provided with a plurality of temperature sensors, which are distributed at different positions in the blending tank.

[0006] When the existing method is used for blending lubricating oil, the demulsifier is added to the blending kettle from the bottom. Since the density of the demulsifier is higher than that of the base oil, the demulsifier will precipitate and accumulate in the dead angle at the bottom of the kettle during stirring, resulting in uneven dispersion of the demulsifier in the base oil, fluctuation or decrease of the performance of the finished oil, and easy influence on the transparency of the oil product appearance.

[0007] Therefore, in order to solve the problem in the prior art that demulsifiers precipitate and aggregate in the base oil, resulting in poor anti-emulsification performance of the oil film bearing oil and unstable quality of the oil film bearing oil, it is urgent to improve the preparation method of the oil film bearing oil. Summary of the Invention

[0008] The purpose of the present invention is to overcome the problem in the prior art that demulsifiers produce precipitation in base oil, resulting in poor anti-emulsification performance of oil film bearing oil and unstable quality of oil film bearing oil, and to provide an oil film bearing oil and a preparation method thereof.

[0009] In order to achieve the above object, the present invention provides a method for preparing an oil film bearing oil in a first aspect, wherein the method comprises the following steps:

[0010] (1) mixing the first portion of base oil and the demulsifier to obtain a demulsifier mother solution;

[0011] (2) performing a second mixing of the second portion of base oil with an antioxidant, an extreme pressure anti-wear agent, a rust inhibitor, and an anti-foaming agent to obtain a mixture A;

[0012] (3) adding the demulsifier mother solution to the mixture A in batches, performing a third mixing to obtain an oil film bearing oil;

[0013] Wherein, the demulsifier mother liquor is added from above the mixture A.

[0014] A second aspect of the present invention provides an oil film bearing oil prepared by the method of the present invention.

[0015] Through the above technical solution, the present invention achieves the following beneficial technical effects: the present invention changes the feeding method of the demulsifier, so that the high-specific-gravity demulsifier is evenly dispersed in the base oil, reducing the precipitation of the demulsifier, thereby giving full play to the anti-emulsification effect of the demulsifier, improving the quality stability of the oil film bearing oil, and effectively ensuring the stable and normal operation of the lubrication system and rolling mill equipment. DETAILED DESCRIPTION

[0016] The endpoints of the ranges and any values ​​disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

[0017] A first aspect of the present invention provides a method for preparing an oil film bearing oil, wherein the method comprises the following steps:

[0018] (1) mixing the first portion of base oil and the demulsifier to obtain a demulsifier mother solution;

[0019] (2) performing a second mixing of the second portion of base oil with an antioxidant, an extreme pressure anti-wear agent, a rust inhibitor, and an anti-foaming agent to obtain a mixture A;

[0020] (3) adding the demulsifier mother solution to the mixture A in batches, performing a third mixing to obtain an oil film bearing oil;

[0021] Wherein, the demulsifier mother liquor is added from above the mixture A.

[0022] In the present invention, the mixing of the base oil, antioxidant, extreme pressure anti-wear agent, rust inhibitor and anti-foaming agent, and the mixing of the demulsifier with the above-mentioned mixed liquid can be carried out in a blending kettle. The blending kettle is commercially available.

[0023] In the present invention, the density of the demulsifier is greater than that of the base oil. When the demulsifier is pumped into the mixing kettle from the bottom, the demulsifier is easily deposited at the bottom of the mixing kettle, resulting in uneven mixing. In addition, when the demulsifier is pumped into the mixing kettle from the bottom, the mixing process of the demulsifier and the base oil is too intense, resulting in insufficient contact between the demulsifier and the base oil, and uneven dispersion of the demulsifier in the base oil, which affects the anti-emulsification performance of the oil product.

[0024] The inventors of the present invention have discovered that changing the method of feeding the demulsifier, adding the demulsifier in batches from the feeding port above the blending kettle, and controlling the flow rate of the sample addition can solve the problems of demulsifier sedimentation at the bottom of the blending kettle, insufficient contact between the demulsifier and the base oil, and uneven dispersion.

[0025] According to some embodiments of the present invention, in step (3), the addition rate of the demulsifier mother solution is 0.1-0.4 mL / s relative to 100 mL of the mixture A.

[0026] In the present invention, adding the demulsifier mother liquid too quickly can lead to uneven dispersion of the demulsifier in the base oil in the kettle, which is detrimental to the stability of the finished product's performance and the transparency of the oil's appearance. When the demulsifier mother liquid addition rate falls within the above-defined range, the demulsifier can fully contact the base oil, antioxidant, extreme pressure anti-wear agent, rust inhibitor, and anti-foaming agent, and the demulsifier can be evenly dispersed therein.

[0027] In the present invention, the demulsifier has a high viscosity. Directly mixing it with the base oil and additives prevents the demulsifier from being evenly dispersed in the base oil, resulting in poor dispersion and affecting the demulsification properties of the final oil product. Therefore, before mixing the demulsifier with the base oil and additives, it is necessary to dilute the demulsifier to prepare a demulsifier mother liquor.

[0028] According to some embodiments of the present application, the concentration of the demulsifier mother liquor is 0.1wt%-5wt%.

[0029] According to some embodiments of the present application, the amount of the first portion of base oil is 0.5wt%-5wt% of the total mass of the base oil, and the amount of the second portion of base oil is 95wt%-99.5wt% of the total mass of the base oil.

[0030] According to some embodiments of the present application, the mass ratio of the total amount of the first portion of base oil and the second portion of base oil to the antioxidant, extreme pressure anti-wear agent, anti-rust agent, anti-foaming agent, demulsifier is (75-95):(0.2-1.0):(0.5-2.5):(0.1-1):(0.01-0.15):(0.005-0.08).

[0031] According to some embodiments of the present application, the kinematic viscosity at 40℃ of the base oil is 80-100mm 2 / s, and the density is 0.86-0.88g / cm 3 .

[0032] According to some embodiments of the present application, the first portion of base oil and the second portion of base oil are each independently selected from at least one of API Group I, API Group II, and API Group III oil.

[0033] According to some embodiments of the present application, the extreme pressure anti-wear agent is selected from at least one of sulfurized isobutylene, zinc dithiophosphate, ammonium thiophosphate, and oleic acid.

[0034] According to some embodiments of the present application, the anti-rust agent is selected from at least one of benzotriazole derivative, imidazoline, and high-alkaline sulfonate.

[0035] In the present application, the high-alkaline sulfonate is selected from at least one of barium dinonylnaphthalene sulfonate, calcium dinonylnaphthalene sulfonate, and zinc dinonylnaphthalene sulfonate.

[0036] According to some embodiments of the present application, the anti-foaming agent is selected from at least one of methyl silicone oil, methacrylic alkyl ester, and composite silicon type anti-foaming agent.

[0037] In the present application, the composite silicon type anti-foaming agent is selected from at least one of BAN169, BAN355, BAN149, 3633E.

[0038] According to some embodiments of the present application, the demulsifier is selected from at least one of propylene oxide diamine polycondensate, high-molecular polyether, hyperbranched high-molecular type demulsifier, ethylene glycol ester, and ethylene glycol ether.

[0039] In the present application, the high molecular polyether is an ethylene oxide-propylene oxide block copolymer ether demulsifier, preferably, the high molecular polyether is selected from at least one of T1001, T1002, DL32 and Mobilad C-310B.

[0040] In the present application, the hyperbranched polymer demulsifier is selected from at least one of polyglycidol-propylene oxide hyperbranched polymer, polyamide-amine dendrimer and methacrylic hyperbranched polyglycerol.

[0041] According to some embodiments of the present application, the kinematic viscosity of the demulsifier at 40℃ is 200-300mm 2 / s, and the density is 1.02-1.18g / cm 3 .

[0042] In the present application, the kinematic viscosity of the demulsifier at 40℃ is too large, which can cause poor dispersion effect of the demulsifier, damage to the structure of the demulsifier, and influence on the appearance of the oil product, such as misting and opacity, and unstable performance. In the present application, the viscosity of the base oil and the demulsifier meets the above range, and the technical effect of uniform dispersion of the demulsifier can be obtained.

[0043] According to some embodiments of the present application, the antioxidant is selected from at least one of diphenylamine, hindered phenolic antioxidant and phosphite.

[0044] In the present application, the hindered phenolic antioxidant is selected from at least one of 2,6-di-tert-butylphenol, 2,6-di-tert-butyl-p-cresol, butylated hydroxytoluene and tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester.

[0045] In the present application, the base oil and the demulsifier both have a certain viscosity. In order to mix the demulsifier and the base oil uniformly and ensure the uniform dispersion of the demulsifier in the base oil, high-strength mechanical stirring can be performed after the base oil and the demulsifier are mixed.

[0046] According to some embodiments of the present application, the first mixing time is 20-30min.

[0047] In the present application, the first mixing temperature is not particularly limited, and the mixing can be performed at room temperature, such as 20-25℃.

[0048] According to some embodiments of the present application, the second mixing conditions include: temperature of 50-65℃, and time of 20-40min.

[0049] According to some embodiments of the present application, the third mixing conditions include: temperature of 50-65℃, and time of 1-2h.

[0050] In the present application, when the second part of base oil is mixed with the antioxidant, extreme pressure anti-wear agent, anti-rust agent and anti-foaming agent, preferably, the second part of base oil is first subjected to heat treatment, and then the heated second part of base oil is mixed with the antioxidant, extreme pressure anti-wear agent, anti-rust agent and anti-foaming agent. More preferably, the temperature of the heated second part of base oil is 50-65℃.

[0051] According to some embodiments of the present application, the batch mode comprises: dividing the demulsifier mother liquor into 3-5 equal parts, and adding the parts into the mixed liquid A at intervals, with an interval time of 5-15 min.

[0052] The present application provides an oil film bearing oil prepared by the method of the present application.

[0053] The present application will be described in detail below through examples.

[0054] The base oil was purchased from Maoming Petrochemical, 500SN.

[0055] The demulsifier was purchased from ExxonMobil Company, product type Mobilad C-310B.

[0056] The kinematic viscosity of the base oil and demulsifier at 40℃ was determined by GB / T 265-1988, Method and Calculation of Kinematic Viscosity of Petroleum Products.

[0057] Unless otherwise specified, the raw materials were commercially available.

[0058] Example 1

[0059] (1) 50 kg of base oil (API II oil, kinematic viscosity at 40℃ of 87 mm 2 / s) was taken, and 0.5 kg of demulsifier (Mobilad C-310B, kinematic viscosity at 40℃ of 275 mm 2 / s) was added thereto, and stirred for 30 min to complete the preparation of the demulsifier mother liquor;

[0060] The concentration of the demulsifier mother liquor was 1 wt%;

[0061] (2) The remaining 1950 kg of base oil was added to a blending kettle and heated to 60℃; 10 kg of antioxidant (diphenylamine), 30 kg of extreme pressure anti-wear agent (zinc dithiophosphate), 10 kg of anti-rust agent (imidazoline) and 2 kg of anti-foaming agent (methyl propylene alkyl ester) were added, respectively, and stirred at 60℃ for 25 min to obtain a mixed liquid A;

[0062] (3) The demulsifier mother liquor is pumped into the kettle from the feeding port above the mixing kettle in 4 batches, the interval time of each batch of demulsifier mother liquor is 10 min, and the stirring is continued at 60°C for 1.5 h until the additives are uniformly dispersed and the oil product is transparent, to obtain oil film bearing oil A1;

[0063] The addition speed of the demulsifier mother liquor is 0.2 mL / s relative to 100 mL of the mixture A.

[0064] Example 2

[0065] (1) 12.5 kg of base oil (API II oil, the kinematic viscosity at 40°C is 87 mm 2 / s) is taken, 0.5 kg of demulsifier (Mobilad C-310B, the kinematic viscosity at 40°C is 275 mm 2 / s) is added, and stirring is performed for 30 min to complete the preparation of the demulsifier mother liquor;

[0066] The concentration of the demulsifier mother liquor is 4 wt%;

[0067] (2) The remaining 1987.5 kg of base oil is added to the mixing kettle, and the temperature is raised to 60°C; 10 kg of antioxidant (phosphite), 30 kg of extreme pressure anti-wear agent (oleic acid), 10 kg of rust inhibitor (high alkaline sulfonate) and 2 kg of antifoaming agent (composite silicon type antifoaming agent) are added, stirring is performed at 60°C for 25 min, and mixture A is obtained;

[0068] (3) The demulsifier mother liquor is pumped into the kettle from the feeding port above the mixing kettle in 3 batches, the interval time of each batch of demulsifier mother liquor is 8 min, and the stirring is continued at 60°C for 1.5 h until the additives are uniformly dispersed and the oil product is transparent, to obtain oil film bearing oil A2;

[0069] The addition speed of the demulsifier mother liquor is 0.4 mL / s relative to 100 mL of the mixture A.

[0070] Example 3

[0071] (1) 100 kg of base oil (API II oil, the kinematic viscosity at 40°C is 87 mm 2 / s) is taken, 0.5 kg of demulsifier (Mobilad C-310B, the kinematic viscosity at 40°C is 275 mm 2 / s) is added, and stirring is performed for 30 min to complete the preparation of the demulsifier mother liquor;

[0072] The concentration of the demulsifier mother liquor is 0.5 wt%;

[0073] (2) 1900 kg base oil was added into the blending kettle, and the temperature was raised to 60 °C; 10 kg antioxidant (2, 6-di-tert-butyl phenol), 30 kg extreme pressure anti-wear agent (sulfurized isobutylene), 10 kg anti-rust agent (methyl benzotriazole) and 2 kg antifoaming agent (methyl silicone oil) were added respectively, and stirred at 60 °C for 25 min to obtain a mixed solution A;

[0074] (3) The demulsifier mother liquor was pumped into the kettle from the upper feeding port of the blending kettle in two batches, and the interval time of each batch of demulsifier mother liquor was 15 min, and the stirring was continued at 60 °C for 1.5 h until the additive was uniformly dispersed and the oil product was transparent to obtain the oil film bearing oil A3.

[0075] The addition speed of the demulsifier mother liquor was 0.1 mL / s with respect to 100 mL of the mixed solution A.

[0076] Example 4

[0077] According to the method of Example 1, except that the addition speed of the demulsifier mother liquor was 2 mL / s with respect to 100 mL of the mixed solution A, the oil film bearing oil A4 was obtained.

[0078] Example 5

[0079] According to the method of Example 1, except that in step (1), the concentration of the demulsifier mother liquor was 7 wt%, the oil film bearing oil A5 was obtained.

[0080] Comparative Example 1

[0081] According to the method of Example 1, except that the demulsifier was directly mixed with the mixed solution A in three batches, the oil film bearing oil B1 was obtained.

[0082] Comparative Example 2

[0083] According to the method of Example 1, except that in step (3), the demulsifier mother liquor was pumped from the bottom of the blending kettle, the oil film bearing oil B2 was obtained.

[0084] Comparative Example 3

[0085] According to the method of Example 1, except that in step (3), the demulsifier mother liquor was pumped into the kettle at one time, the oil film bearing oil B3 was obtained.

[0086] Test Example

[0087] The oil film bearing oils A1-A5, B1-B3 in Examples 1-5 and Comparative Examples 1-3 were subjected to anti-emulsification performance test respectively, and the results are shown in Table 1.

[0088] For the same batch of produced oil film bearing oil, three samples were randomly selected for anti-emulsification performance test.

[0089] The anti-emulsification performance is determined by GB / T 8022-2019 ASTM D2711 Determination of Anti-emulsification Performance of Lubricating Oil.

[0090] Table 1

[0091]

[0092]

[0093] It can be seen from the results in Table 1 that the oil film bearing oil prepared by the method of embodiments 1-3 has a shorter water separation time (water separation time < 16 min), showing more excellent demulsification performance, and the random sampling test result data fluctuates less, having more stable and uniform water separation effect.

[0094] Compared with embodiments 1-3, in example 4, the addition speed of the demulsifier mother liquor is too fast, the water separation time of the obtained oil film bearing oil is prolonged, and the water separation effect of the oil film bearing oil randomly sampled from the same batch is large; in example 5, the concentration of the demulsifier mother liquor is too high, the water separation time of the obtained oil film bearing oil is prolonged, and the water separation effect of the oil film bearing oil randomly sampled from the same batch is large.

[0095] Compared with embodiments 1-3, in comparative example 1, the demulsifier is not diluted, the water separation time of the obtained oil film bearing oil is different (the water separation time is more than 30 min), which affects the transparency of the appearance of the oil product, and the water separation effect of the oil film bearing oil sampled from different positions of the same batch is large; in comparative example 2, the demulsifier mother liquor is added from the bottom of the blending kettle by using the conventional feeding mode, the demulsifier is not uniformly dispersed in the base oil, resulting in the decrease of the water separation performance of the finished oil film bearing oil, and the water separation performance of the oil film bearing oil sampled from different positions of the same batch fluctuates greatly; in comparative example 3, the demulsifier mother liquor is not added in batches, and the water separation performance of the oil film bearing oil prepared fluctuates greatly.

[0096] In summary, the present application changes the feeding mode of the demulsifier, uniformly disperses the demulsifier with high specific gravity in the base oil, reduces the precipitation of the demulsifier, thereby fully plays the anti-emulsification effect of the demulsifier, improves the quality stability of the oil film bearing oil, and effectively guarantees the stable and normal operation of the lubricating system and the rolling mill equipment.

[0097] The above describes the preferred embodiments of the present application, but the present application is not limited thereto. Within the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be considered as disclosed by the present application, and all belong to the protection scope of the present application.

Claims

1. A method of preparing an oil film bearing oil, characterized by, The method comprises the following steps: (1) mixing a first part of base oil with a demulsifier to obtain a demulsifier mother liquor; (2) mixing a second part of base oil with an antioxidant, an extreme pressure anti-wear agent, an anti-rust agent and an antifoam agent to obtain a mixture A; (3) adding the demulsifier mother liquor into the mixture A in batches and mixing to obtain an oil film bearing oil. In step (3), the demulsifier mother liquor is added at a speed of 0.1-0.4 mL / s relative to 100 mL of the mixture A.

2. The method of claim 1, wherein, In the demulsifier mother liquor, the concentration of the demulsifier is 0.1wt%-5wt%.

3. The method of claim 1 or 2, wherein, The amount of the first part of base oil is 0.5wt%-5wt% of the total mass of base oil; 4. The method of any of claims 1-3, wherein, And / or, the amount of the second part of base oil is 95wt%-99.5wt% of the total mass of base oil. The total amount of the first part of base oil and the second part of base oil and the mass ratio of the antioxidant, the extreme pressure anti-wear agent, the anti-rust agent, the antifoam agent, the demulsifier are (75-95):(0.2-1.0):(0.5-2.5):(0.1-1):(0.01-0.15):(0.005-0.08).

5. The method of any of claims 1-4, wherein, The first mixing is performed for 20-30 min; 6. The method of any of claims 1-5, wherein, And / or, the second mixing is performed under conditions including a temperature of 50-65℃ and a time of 20-40 min; And / or, the third mixing is performed under conditions including a temperature of 50-65℃ and a time of 1-2 h. The first part of base oil and the second part of base oil are each independently selected from at least one of API Group I, API Group II and API Group III oil; 7. The method of any of claims 1-6, wherein, The base oil has a kinematic viscosity at 40°C of 80-100 mm 2 / s and a density of 0.86-0.88 g / cm 3 ; and / or the demulsifier has a kinematic viscosity at 40°C of 200-300 mm 2 / s, a density of 1.02-1.18 g / cm 3 .

8. The method of any one of claims 1-7, wherein, And / or, the extreme pressure anti-wear agent is selected from at least one of sulfurized isobutylene, zinc dithiophosphate, ammonium thio-phosphate and oleic acid; And / or, the anti-rust agent is selected from at least one of benzotriazole derivatives, imidazoline and high-alkaline sulfonate; And / or, the antifoam agent is selected from at least one of methyl silicone oil, methacrylic alkyl ester and composite silicon type antifoam agent; And / or, the demulsifier is selected from at least one of propylene oxide diamine polycondensate, high-molecular polyether type, hyperbranched high-molecular type, ethylene glycol ester and ethylene glycol ether; And / or, the antioxidant is selected from at least one of diphenylamine, hindered phenolic antioxidant and phosphite. The adding in batches comprises: dividing the demulsifier mother liquor into 3-5 equal parts and adding the parts into the mixture A at intervals, with an interval time of 5-15 min.

9. The method of any of claims 1-8, wherein, 10. An oil film bearing oil prepared by the method of any one of claims 1-9. ​

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