High-gloss gold-plated silver-plated steel sheet cold rolling lubricant and preparation method thereof

Abstract

The application provides a high-gloss gold-plated silver-plated steel plate cold rolling lubricating oil and a preparation method thereof. The high-gloss gold-plated silver-plated steel plate cold rolling lubricating oil comprises base oil, modified nano filler, extreme pressure agent, antioxidant and emulsifier. The surface of layered nano boron nitride and spherical nano aluminum oxide is subjected to surface activity treatment by using a surfactant obtained by reacting castor oil phosphate, castor oil acid and trimethylol aminomethyl methane. The synergistic effect between the modified nano filler and the extreme pressure agent makes the obtained rolling lubricating oil used for stainless steel plate rolling. After annealing without using a cleaning and degreasing process, the surface roughness Ra of the obtained stainless steel is less than or equal to 0.065 microns, the glossiness is greater than or equal to 500 GU, and the reflectivity is greater than or equal to 90%, so that the stainless steel has excellent high glossiness and mirror effect, and the application of the steel plate cold rolling lubricating oil in the mirror steel field is expanded.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of metal processing lubrication, and particularly relates to a high-gloss gold-plated silver-plated steel plate cold rolling lubricating oil and a preparation method thereof. BACKGROUND

[0002] In the field of cold rolled steel plate processing, rolling oil as a key process lubricant plays a crucial role. It not only forms an effective lubricating film between the roller and the steel plate, reducing rolling force and friction, reducing roller wear and improving roller service life, but also effectively cools the heat generated during rolling, controls the temperature of the steel plate and ensures the dimensional accuracy and surface quality of the steel plate. The existing cold rolling oil is usually composed of base oil, extreme pressure anti-wear agent, oiliness agent, emulsifier, rust inhibitor and antioxidant, and its performance directly affects the cleanliness, lubricity and cooling of the steel plate surface.

[0003] The existing steel plate cold rolling oil has the following advantages:

[0004] Lubrication performance: the existing rolling oil can form a stable oil film during rolling by adding extreme pressure anti-wear agent and oiliness agent, reducing friction and wear between the roller and the steel plate, reducing rolling force and improving rolling efficiency.

[0005] Cooling performance: water and steam in the rolling oil can carry away a large amount of heat during rolling, effectively reducing the temperature of the roller and the steel plate, preventing roller wear and surface quality degradation due to overheating. Good cooling performance helps to maintain the stability of the rolling process and improve the dimensional accuracy of the steel plate.

[0006] Rust prevention: some rolling oil products can form a protective film on the surface of the steel plate by adding a rust inhibitor, preventing the steel plate from rusting after rolling and prolonging the storage time of the steel plate.

[0007] Emulsification stability: the existing rolling oil usually has good emulsification stability and can be uniformly dispersed in water to form a stable emulsion. The stability of the emulsion directly affects the lubrication effect during rolling and the cleanliness of the steel plate surface.

[0008] The existing steel plate cold rolling rolling oil mostly focuses on meeting the basic performance requirements of ordinary steel plate cold rolling, such as having certain lubricity, cooling property, rust prevention and stability and the like. However, for gold-plated silver-plated steel plates and other special steel plates with extremely high requirements on surface quality, the existing rolling oil has obvious deficiencies. On the one hand, the lubricating property and extreme pressure property thereof are difficult to form a uniform and stable lubricating film under high requirement rolling conditions, resulting in that scratches and scratches are easily generated on the surface of the steel plate, thereby affecting the apparent quality of the steel plate. On the other hand, the residual amount of the existing rolling oil on the surface of the steel plate is not controlled accurately, and the residual rolling oil components can have adverse effects on the subsequent gold plating and silver plating processes, such as causing poor plating adhesion, surface spots and other problems, thereby affecting the gloss and mirror effect of the steel plate. In addition, the existing rolling oil lacks optimization for the surface characteristics of gold-plated silver-plated steel plates in the formula design, and cannot effectively improve the microstructure of the surface of the steel plate, and is difficult to meet the requirements of high gloss and mirror effect.

[0009] In view of the above problems existing in the prior art, it is urgent to develop a high-gloss gold-plated silver-plated steel plate cold rolling rolling oil and a preparation method thereof, to overcome the technical problems of the existing rolling oil in apparent quality control, compatibility with subsequent gold plating and silver plating processes, and surface gloss improvement, so as to obtain a steel plate with good apparent quality, high gloss and mirror effect. SUMMARY

[0010] In view of the defects existing in the prior art, one object of the present application is to provide a high-gloss gold-plated silver-plated steel plate cold rolling rolling oil and a preparation method thereof, which aims to solve the technical problems of poor apparent quality and insufficient gloss of the existing rolling oil.

[0011] To achieve the above object, the technical scheme adopted by the present application is as follows:

[0012] The first object of the present application is to provide a high-gloss gold-plated silver-plated steel plate cold rolling rolling oil, which comprises the following components and their mass fractions:

[0013] 60-95 parts of base oil;

[0014] 0.3-1 parts of modified nano filler;

[0015] 2-15 parts of extreme pressure agent;

[0016] 0.5-1.5 parts of antioxidant;

[0017] 1-3 parts of emulsifier;

[0018] The base oil comprises natural oil and synthetic ester;

[0019] The natural oil is selected from one or more of palm oil, coconut oil, castor oil, beef tallow and lard;

[0020] the synthetic ester is selected from one or more of pentaerythritol oleate, pentaerythritol stearate, trimethylolpropane oleate, trimethylolpropane laurate, isooctyl stearate and isooctyl palmitate;

[0021] the mass ratio of the natural oil and the synthetic ester is (2-4) : 1;

[0022] the modified nanofiller is a compound of modified nanoboron nitride and modified nanoalumina;

[0023] the modified nanofiller is a compound of surfactant-modified nanoboron nitride and nanoalumina obtained by reaction of castor oil phosphate, castor oil acid and tris-hydroxymethyl aminomethane;

[0024] Preferably, the mass ratio of the nanoboron nitride and the nanoalumina is (1-2) : 1;

[0025] the preparation method of the modified nanofiller comprises the following steps:

[0026] (3) synthesis of surfactant: castor oil phosphate, castor oil acid and tris-hydroxymethyl aminomethane are reacted under nitrogen protection, with tetrahydrofuran as solvent, at 80-90°C for 8-10h, and the solvent is removed by rotary evaporation to obtain a brownish sticky product;

[0027] (4) the brownish sticky product is dissolved in a mixed solvent of ethanol / water with a volume ratio of 1:1, nanoboron nitride is added and ultrasonically dispersed for 0.5-1h, the temperature is raised to 60-80°C and reacted for 4-6h, nanoalumina is further added and ultrasonically dispersed for 0.5-1h, and the reaction is continued at 60-80°C for 4-6h; then centrifugal filtration, washing and drying are performed to obtain the modified nanofiller.

[0028] Preferably, the mass ratio of the castor oil phosphate and the castor oil acid is (2-5) : 1;

[0029] Preferably, the mass ratio of the castor oil acid phosphate, the castor oil acid and the tris-hydroxymethyl aminomethane is (2-3) : 1;

[0030] Preferably, the mass concentration of the castor oil acid phosphate, the castor oil acid and the tris-hydroxymethyl aminomethane in tetrahydrofuran is 3%-5%;

[0031] Preferably, the mass concentration of the brownish sticky product in the mixed solvent of ethanol / water in step (2) is 5-10%;

[0032] Preferably, the mass ratio of the nanoboron nitride and the nanoalumina is (1-2) : 1;

[0033] Preferably, the mass ratio between the total mass of the ricinoleic acid phosphate, ricinoleic acid and trimethylol aminomethane and the total mass of the nano boron nitride and nano aluminum oxide is 1:(0.3-0.5);

[0034] Preferably, the particle size of the nano boron nitride is 50-100 nm; the nano aluminum oxide is γ-Al2O3, and the particle size is 30-50 nm;

[0035] The extreme pressure agent is selected from one or more of sulfidized ester, alkyl polysulfide and phosphate ester;

[0036] The mass ratio of the modified nano filler and the extreme pressure agent is 1:(7-15);

[0037] The antioxidant is selected from one or more of phenolic antioxidant, amine antioxidant and sulfur-phosphorus complex antioxidant;

[0038] Preferably, the phenolic antioxidant is selected from one or both of T501 or Irganox L135;

[0039] Preferably, the amine antioxidant is selected from Irganox L57 or Irganox L06;

[0040] Preferably, the sulfur-phosphorus complex antioxidant is selected from T309 or ZDDP;

[0041] The emulsifier is selected from one or more of fatty acid polyoxyethylene ether, alkyl phenol polyoxyethylene ether and fatty alcohol polyoxyethylene ether;

[0042] A second object of the present application is to provide a preparation method of high-gloss gold-plated silver-plated steel plate cold rolling lubricating oil, comprising the following steps:

[0043] S1, mixing the modified nano filler, extreme pressure agent and emulsifier to obtain a first mixture A;

[0044] S2, mixing the base oil, adding the antioxidant to obtain a second mixture B;

[0045] S3, mixing the first mixture A and the second mixture B to obtain the high-gloss gold-plated silver-plated steel plate cold rolling lubricating oil.

[0046] Preferably, the preparation steps of the above preparation method are as follows:

[0047] S1: adding the modified nano filler, extreme pressure agent and emulsifier to a high-speed disperser in sequence for stirring and mixing to obtain a first mixture A;

[0048] S2, after mixing the base oil, adding it into a container and heating to 75-95℃, then adding the antioxidant, stirring uniformly and cooling to 45-65℃ to obtain a second mixture B;

[0049] S3: adding the first mixture A obtained in step S1 into the first mixture B obtained in step S2, stirring to obtain the high-gloss gold-plated silver-plated steel plate cold rolling lubricating oil.

[0050] The third object of the present application is to provide an application of the high-gloss gold-plated silver-plated steel plate cold rolling lubricating oil in improving the surface gloss of the gold-plated silver-plated steel plate.

[0051] Compared with the prior art, the present application has the following advantages:

[0052] (1) The present application creatively adds modified nano filler to the steel plate cold rolling lubricating oil, and performs surface activity treatment on the layered nano boron nitride and spherical nano aluminum oxide through a surfactant obtained by the reaction of castor oil phosphate, castor oil acid and trimethylol aminomethane (the long-chain end of the surfactant provides steric hindrance, and the amino and / or hydroxyl group at the other end is bonded or adsorbed to the surface of the nano filler), and then through the synergistic effect between the modified nano filler and the extreme pressure agent, the finally obtained rolling lubricating oil is used for stainless steel plate rolling, and after direct annealing without using a cleaning and degreasing process, the obtained stainless steel surface has a roughness Ra≤0.065 μm, a gloss≥500 GU and a reflectivity≥90%, and has excellent high gloss and mirror effect.

[0053] (2) The present application creatively finds that, in the preparation process of the modified nano filler, the castor oil phosphate and the castor oil acid produce a synergistic effect when reacting with the trimethylol aminomethane, and together improve the surface modification effect of the modified nano filler, and further improve the performance of the rolling lubricating oil when rolling the stainless steel.

[0054] (3) The present application creatively finds that, in the preparation process of the modified nano filler, the layered nano boron nitride and the spherical nano aluminum oxide produce a synergistic effect, which affects the performance of the subsequent rolling oil.

[0055] (4) The present application creatively finds that, in the rolling lubricating oil, the modified nano filler and the extreme pressure agent produce a synergistic effect, which improves the rolling effect of the rolling lubricating oil, which may be because the organic chain in the surface-treated modified nano filler has good compatibility and wetting effect on the structure of the extreme pressure agent, which affects the performance of the subsequent rolling oil. DETAILED DESCRIPTION

[0056] The raw materials and equipment used in the present application are conventional raw materials and equipment in the art unless otherwise specified; the methods used in the present application are conventional methods in the art unless otherwise specified.

[0057] The meanings of the terms in the specification are the same as those generally understood by those skilled in the art, but if there is a conflict, the definitions in the specification shall prevail.

[0058] For the purpose of better illustrating the object, technical scheme and advantages of the present application, the present application will be further described in conjunction with specific examples.

[0059] Each raw material is selected as follows:

[0060] Castor oil phosphate: Haian Petroleum Chemical Plant of Jiangsu Province, Haishi Flower;

[0061] Castor oil acid: Shandong Qi Yi Chemical Industry;

[0062] Tris-hydroxymethyl aminomethane: Jinan Xiqu Chemical Industry;

[0063] Nano γ-Al2O3: Beijing Deke Island Gold Technology, DK410-2, average particle size 20 nm;

[0064] Nano boron nitride: Beijing Deke Island Gold Technology, DK-BN-001, average particle size 50 nm;

[0065] Palm oil: Yihai Kerry Golden Dragon Food Group Co., Ltd., 24° delicate palm oil;

[0066] Pentaerythritol oleate: Haian Petroleum Chemical Plant of Jiangsu Province, Haishi Flower, PETO;

[0067] Oleyl polyoxyethylene ether phosphate: Solvay, LUBRHOPHOS LB-400;

[0068] Alkyl phenol polyoxyethylene ether: Haian Petroleum Chemical Plant of Jiangsu Province, Haishi Flower, OP-7;

[0069] Preparation of modified nano filler

[0070] Preparation Example 1

[0071] Preparation of modified nano filler M-BN-Al2O3-1:

[0072] (1) Castor oil phosphate, castor oil acid and tris-hydroxymethyl aminomethane were prepared into a solution with a mass concentration of 3% in tetrahydrofuran under nitrogen protection, and reacted at 80℃ for 8h. After removing the solvent by rotary evaporation, a brownish sticky product was obtained;

[0073] (2) The brownish viscous product is dissolved in a mixed solvent of ethanol / water with a volume ratio of 1:1 to form a solution with a mass concentration of 5%, nano boron nitride is added and ultrasonic dispersed for 0.5 h, heated to 80°C for 6 h, then nano alumina is added and ultrasonic dispersed for 0.5 h, and the reaction is continued at 80°C for 6 h; after centrifugal filtration, ethanol washing for three times, and vacuum drying at 90°C, the modified nano filler M-BN-Al2O3-1 is obtained.

[0074] The mass ratio of castor oil phosphate and castor oil acid is 2:1; the mass ratio of the total mass of castor oil acid phosphate and castor oil acid to the mass of trimethylol aminomethane is 2:1;

[0075] The mass ratio of nano boron nitride and nano alumina is 1:1;

[0076] The mass ratio between the total mass of castor oil acid phosphate, castor oil acid and trimethylol aminomethane and the total mass of nano boron nitride and nano alumina is 1:0.5.

[0077] Preparation Example 2

[0078] Preparation of the modified nano filler M-BN-Al2O3-2:

[0079] (1) Castor oil phosphate, castor oil acid and trimethylol aminomethane are dissolved in tetrahydrofuran under nitrogen protection to form a solution with a mass concentration of 3%, and the reaction is carried out at 80°C for 8 h; after removing the solvent by rotary evaporation, a brownish viscous product is obtained;

[0080] (2) The brownish viscous product is dissolved in a mixed solvent of ethanol / water with a volume ratio of 1:1 to form a solution with a mass concentration of 5%, nano boron nitride is added and ultrasonic dispersed for 0.5 h, heated to 80°C for 6 h, then nano alumina is added and ultrasonic dispersed for 0.5 h, and the reaction is continued at 80°C for 6 h; after centrifugal filtration, ethanol washing for three times, and vacuum drying at 90°C, the modified nano filler M-BN-Al2O3-2 is obtained.

[0081] The mass ratio of castor oil phosphate and castor oil acid is 3:1; the mass ratio of the total mass of castor oil acid phosphate and castor oil acid to the mass of trimethylol aminomethane is 2:1;

[0082] The mass ratio of nano boron nitride and nano alumina is 1:1;

[0083] The mass ratio between the total mass of castor oil acid phosphate, castor oil acid and trimethylol aminomethane and the total mass of nano boron nitride and nano alumina is 1:0.5.

[0084] Preparation Example 3

[0085] Preparation of the modified nano filler M-BN-Al2O3-3:

[0086] (1) Cast a solution of castor oil phosphate, castor oil acid and tris-hydroxymethyl aminomethane in tetrahydrofuran with a mass concentration of 3% under nitrogen protection, and react at 80℃ for 8h. After removing the solvent by rotary evaporation, a brownish sticky product is obtained;

[0087] (2) Dissolve the brownish sticky product in a mixed solvent of ethanol / water with a volume ratio of 1:1 to form a solution with a mass concentration of 5%, and then add nano-boron nitride and ultrasonically disperse for 0.5h. After being heated to 80℃ for 6h, nano-aluminum oxide is added and ultrasonically dispersed for 0.5h. Continue to react at 80℃ for 6h. After centrifugal filtration, ethanol washing for three times and vacuum drying at 90℃, a modified nano-filler M-BN-Al2O3-3 is obtained.

[0088] The mass ratio of castor oil phosphate and castor oil acid is 5:1; the mass ratio of the total mass of castor oil acid phosphate and castor oil acid to the mass of tris-hydroxymethyl aminomethane is 2:1;

[0089] The mass ratio of nano-boron nitride and nano-aluminum oxide is 1:1;

[0090] The mass ratio between the total mass of castor oil acid phosphate, castor oil acid and tris-hydroxymethyl aminomethane and the total mass of nano-boron nitride and nano-aluminum oxide is 1:0.5.

[0091] Preparation Example 4

[0092] Preparation of modified nano-filler M-BN-Al2O3-4:

[0093] (1) Cast a solution of castor oil phosphate, castor oil acid and tris-hydroxymethyl aminomethane in tetrahydrofuran with a mass concentration of 3% under nitrogen protection, and react at 80℃ for 8h. After removing the solvent by rotary evaporation, a brownish sticky product is obtained;

[0094] (2) Dissolve the brownish sticky product in a mixed solvent of ethanol / water with a volume ratio of 1:1 to form a solution with a mass concentration of 5%, and then add nano-boron nitride and ultrasonically disperse for 0.5h. After being heated to 80℃ for 6h, nano-aluminum oxide is added and ultrasonically dispersed for 0.5h. Continue to react at 80℃ for 6h. After centrifugal filtration, ethanol washing for three times and vacuum drying at 90℃, a modified nano-filler M-BN-Al2O3-4 is obtained.

[0095] The mass ratio of castor oil phosphate and castor oil acid is 3:1; the mass ratio of the total mass of castor oil acid phosphate and castor oil acid to the mass of tris-hydroxymethyl aminomethane is 3:1;

[0096] The mass ratio of nano-boron nitride and nano-aluminum oxide is 1:1;

[0097] The mass ratio between the total mass of ricinoleic acid phosphate, ricinoleic acid and trimethylol aminomethane and the total mass of nano boron nitride and nano aluminum oxide is 1:0.5.

[0098] Preparation Example 5

[0099] Preparation of modified nano filler M-BN-Al2O3-5:

[0100] (1) Ricinoleic acid phosphate, ricinoleic acid and trimethylol aminomethane are dissolved in tetrahydrofuran under nitrogen protection to form a solution with a mass concentration of 3%, and reacted at 80°C for 8h. After removing the solvent by rotary evaporation, a brownish sticky product is obtained;

[0101] (2) The brownish sticky product is dissolved in a mixed solvent of ethanol / water with a volume ratio of 1:1 to form a solution with a mass concentration of 5%, nano boron nitride is added and ultrasonic dispersed for 0.5h, heated to 80°C and reacted for 6h, then nano aluminum oxide is added and ultrasonic dispersed for 0.5h, and the reaction is continued at 80°C for 6h. After centrifugal filtration, ethanol washing three times and vacuum drying at 90°C, the modified nano filler M-BN-Al2O3-5 is obtained.

[0102] The mass ratio of ricinoleic acid phosphate and ricinoleic acid is 3:1; the mass ratio of the mass of ricinoleic acid phosphate and ricinoleic acid and the mass of trimethylol aminomethane is 2:1;

[0103] The mass ratio of nano boron nitride and nano aluminum oxide is 2:1;

[0104] The mass ratio between the total mass of ricinoleic acid phosphate, ricinoleic acid and trimethylol aminomethane and the total mass of nano boron nitride and nano aluminum oxide is 1:0.5.

[0105] Preparation Example 6

[0106] Preparation of modified nano filler M-BN-Al2O3-6:

[0107] (1) Ricinoleic acid phosphate, ricinoleic acid and trimethylol aminomethane are dissolved in tetrahydrofuran under nitrogen protection to form a solution with a mass concentration of 3%, and reacted at 80°C for 8h. After removing the solvent by rotary evaporation, a brownish sticky product is obtained;

[0108] (2) The brownish sticky product is dissolved in a mixed solvent of ethanol / water with a volume ratio of 1:1 to form a solution with a mass concentration of 5%, nano boron nitride is added and ultrasonic dispersed for 0.5h, heated to 80°C and reacted for 6h, then nano aluminum oxide is added and ultrasonic dispersed for 0.5h, and the reaction is continued at 80°C for 6h. After centrifugal filtration, ethanol washing three times and vacuum drying at 90°C, the modified nano filler M-BN-Al2O3-6 is obtained.

[0109] The mass ratio of castor oil phosphate and castor oil acid is 3:1; the mass ratio of castor oil acid phosphate and castor oil acid to the mass of trimethylol aminomethane is 2:1;

[0110] The mass ratio of nano boron nitride and nano aluminum oxide is 1:1;

[0111] The mass ratio between the total mass of castor oil acid phosphate, castor oil acid and trimethylol aminomethane and the total mass of nano boron nitride and nano aluminum oxide is 1:0.3.

[0112] Comparative Preparation Example 1

[0113] Preparation of modified nano filler M-BN-Al2O3-C1:

[0114] (1) Castor oil phosphate, castor oil acid and trimethylol aminomethane are dissolved in tetrahydrofuran under nitrogen protection to form a solution with a mass concentration of 3%, and reacted at 80°C for 8h. After removing the solvent by rotary evaporation, a brownish sticky product is obtained;

[0115] (2) The brownish sticky product is dissolved in a volume ratio of 1:1 of ethanol / water mixed solvent to form a solution with a mass concentration of 5%, nano boron nitride is added and ultrasonic dispersed for 0.5h, heated to 80°C and reacted for 6h, then nano aluminum oxide is added and ultrasonic dispersed for 0.5h, and the reaction is continued at 80°C for 6h. After centrifugal filtration, ethanol washing three times and vacuum drying at 90°C, the modified nano filler M-BN-Al2O3-C1 is obtained.

[0116] The mass ratio of castor oil phosphate and castor oil acid is 1:1; the mass ratio of castor oil acid phosphate and castor oil acid to the mass of trimethylol aminomethane is 2:1;

[0117] The mass ratio of nano boron nitride and nano aluminum oxide is 1:1;

[0118] The mass ratio between the total mass of castor oil acid phosphate, castor oil acid and trimethylol aminomethane and the total mass of nano boron nitride and nano aluminum oxide is 1:0.5.

[0119] Comparative Preparation Example 2

[0120] Preparation of modified nano filler M-BN-Al2O3-C2:

[0121] (1) Castor oil phosphate, castor oil acid and trimethylol aminomethane are dissolved in tetrahydrofuran under nitrogen protection to form a solution with a mass concentration of 3%, and reacted at 80°C for 8h. After removing the solvent by rotary evaporation, a brownish sticky product is obtained;

[0122] (2) The brownish viscous product is dissolved in a mixed solvent of ethanol / water with a volume ratio of 1:1 to form a solution with a mass concentration of 5%, nano boron nitride is added and ultrasonic dispersed for 0.5 h, heated to 80 °C for 6 h, then nano alumina is added and ultrasonic dispersed for 0.5 h, and the reaction is continued at 80 °C for 6 h; after centrifugal filtration, ethanol washing three times, and vacuum drying at 90 °C, the modified nano filler M-BN-Al2O3-C2 is obtained.

[0123] The mass ratio of castor oil phosphate and castor oil acid is 6:1; the mass ratio of castor oil acid phosphate and castor oil acid to the mass of trimethylol aminomethane is 2:1;

[0124] The mass ratio of nano boron nitride and nano alumina is 1:1;

[0125] The mass ratio between the total mass of castor oil acid phosphate, castor oil acid and trimethylol aminomethane and the total mass of nano boron nitride and nano alumina is 1:0.5.

[0126] Comparative Preparation Example 3

[0127] Preparation of modified nano filler M-BN-Al2O3-C3:

[0128] (1) Castor oil phosphate, castor oil acid and trimethylol aminomethane are dissolved in tetrahydrofuran under nitrogen protection to form a solution with a mass concentration of 3%, and the reaction is carried out at 80 °C for 8 h; after removing the solvent by rotary evaporation, a brownish viscous product is obtained;

[0129] (2) The brownish viscous product is dissolved in a mixed solvent of ethanol / water with a volume ratio of 1:1 to form a solution with a mass concentration of 5%, nano boron nitride is added and ultrasonic dispersed for 0.5 h, heated to 80 °C for 6 h, then nano alumina is added and ultrasonic dispersed for 0.5 h, and the reaction is continued at 80 °C for 6 h; after centrifugal filtration, ethanol washing three times, and vacuum drying at 90 °C, the modified nano filler M-BN-Al2O3-C3 is obtained.

[0130] The mass ratio of castor oil phosphate and castor oil acid is 3:1; the mass ratio of castor oil acid phosphate and castor oil acid to the mass of trimethylol aminomethane is 1:1;

[0131] The mass ratio of nano boron nitride and nano alumina is 1:1;

[0132] The mass ratio between the total mass of castor oil acid phosphate, castor oil acid and trimethylol aminomethane and the total mass of nano boron nitride and nano alumina is 1:0.5.

[0133] Comparative Preparation Example 4

[0134] Preparation of modified nanofiller M-BN-Al2O3-C4:

[0135] (1) Cast castor oil phosphate, castor oil acid and trimethylol aminomethane into a solution with a mass concentration of 3% in tetrahydrofuran under nitrogen protection, react at 80℃ for 8h, and obtain a brownish sticky product after removing the solvent by rotary evaporation;

[0136] (2) Dissolve the above brownish sticky product into a mixed solvent of ethanol / water with a volume ratio of 1:1 to form a solution with a mass concentration of 5%, add nanometer boron nitride and ultrasonic dispersion for 0.5h, heat to 80℃ and react for 6h, then add nanometer aluminum oxide and ultrasonic dispersion for 0.5h, continue to react at 80℃ for 6h; after centrifugal filtration, ethanol washing for three times and vacuum drying at 90℃, the modified nanofiller M-BN-Al2O3-C4 is obtained.

[0137] Among them, the mass ratio of castor oil phosphate and castor oil acid is 3:1; the mass ratio of castor oil acid phosphate and castor oil acid to trimethylol aminomethane is 4:1;

[0138] The mass ratio of nanometer boron nitride and nanometer aluminum oxide is 1:1;

[0139] The mass ratio between the total mass of castor oil acid phosphate, castor oil acid and trimethylol aminomethane and the total mass of nanometer boron nitride and nanometer aluminum oxide is 1:0.5.

[0140] Comparative Preparation Example 5

[0141] Preparation of modified nanofiller M-BN-Al2O3-C5:

[0142] (1) Cast castor oil phosphate, castor oil acid and trimethylol aminomethane into a solution with a mass concentration of 3% in tetrahydrofuran under nitrogen protection, react at 80℃ for 8h, and obtain a brownish sticky product after removing the solvent by rotary evaporation;

[0143] (2) Dissolve the above brownish sticky product into a mixed solvent of ethanol / water with a volume ratio of 1:1 to form a solution with a mass concentration of 5%, add nanometer boron nitride and ultrasonic dispersion for 0.5h, heat to 80℃ and react for 6h, then add nanometer aluminum oxide and ultrasonic dispersion for 0.5h, continue to react at 80℃ for 6h; after centrifugal filtration, ethanol washing for three times and vacuum drying at 90℃, the modified nanofiller M-BN-Al2O3-C5 is obtained.

[0144] Among them, the mass ratio of castor oil phosphate and castor oil acid is 3:1; the mass ratio of castor oil acid phosphate and castor oil acid to trimethylol aminomethane is 2:1;

[0145] The mass ratio of nanometer boron nitride and nanometer aluminum oxide is 3:1;

[0146] The mass ratio between the total mass of ricinoleic acid phosphate, ricinoleic acid and trimethylol aminomethane and the total mass of nano boron nitride and nano aluminum oxide is 1:0.5.

[0147] Comparative Preparation Example 6

[0148] Preparation of modified nano filler M-BN-Al2O3-C6:

[0149] (1) Ricinoleic acid phosphate, ricinoleic acid and trimethylol aminomethane were dissolved in tetrahydrofuran to form a solution with a mass concentration of 3% under nitrogen protection, and reacted at 80°C for 8h. After removing the solvent by rotary evaporation, a brown sticky product was obtained;

[0150] (2) The brown sticky product was dissolved in a mixed solvent of ethanol / water with a volume ratio of 1:1 to form a solution with a mass concentration of 5%, and then nano boron nitride was added and ultrasonically dispersed for 0.5h. The temperature was raised to 80°C and reacted for 6h. Then nano aluminum oxide was added and ultrasonically dispersed for 0.5h, and the reaction was continued at 80°C for 6h. After centrifugal filtration, ethanol washing three times and vacuum drying at 90°C, the modified nano filler M-BN-Al2O3-C6 was obtained.

[0151] The mass ratio of ricinoleic acid phosphate and ricinoleic acid is 3:1; the mass ratio of the mass of ricinoleic acid phosphate and ricinoleic acid and the mass of trimethylol aminomethane is 2:1;

[0152] The mass ratio of nano boron nitride and nano aluminum oxide is 1:1;

[0153] The mass ratio between the total mass of ricinoleic acid phosphate, ricinoleic acid and trimethylol aminomethane and the total mass of nano boron nitride and nano aluminum oxide is 1:1.

[0154] Comparative Preparation Example 7

[0155] Preparation of modified nano filler M-BN-Al2O3-C7:

[0156] (1) Ricinoleic acid phosphate and trimethylol aminomethane were dissolved in tetrahydrofuran to form a solution with a mass concentration of 3% under nitrogen protection, and reacted at 80°C for 8h. After removing the solvent by rotary evaporation, a brown sticky product was obtained;

[0157] (2) The brown sticky product was dissolved in a mixed solvent of ethanol / water with a volume ratio of 1:1 to form a solution with a mass concentration of 5%, and then nano boron nitride was added and ultrasonically dispersed for 0.5h. The temperature was raised to 80°C and reacted for 6h. Then nano aluminum oxide was added and ultrasonically dispersed for 0.5h, and the reaction was continued at 80°C for 6h. After centrifugal filtration, ethanol washing three times and vacuum drying at 90°C, the modified nano filler M-BN-Al2O3-C7 was obtained.

[0158] The mass ratio of ricinoleic acid phosphate and tris-hydroxymethyl aminomethane is 2:1;

[0159] The mass ratio of nano boron nitride and nano aluminum oxide is 1:1;

[0160] The mass ratio between the total mass of ricinoleic acid phosphate and tris-hydroxymethyl aminomethane and the total mass of nano boron nitride and nano aluminum oxide is 1:0.5.

[0161] Comparative Preparation Example 8

[0162] Preparation of modified nano filler M-BN-Al2O3-C8:

[0163] (1) Ricinoleic acid and tris-hydroxymethyl aminomethane were dissolved in tetrahydrofuran under nitrogen protection to form a solution with a mass concentration of 3%, and reacted at 80°C for 8h. After removing the solvent by rotary evaporation, a brownish sticky product was obtained;

[0164] (2) The brownish sticky product was dissolved in a volume ratio of 1:1 of ethanol / water mixed solvent to form a solution with a mass concentration of 5%, and nano boron nitride was added and ultrasonically dispersed for 0.5h. The temperature was raised to 80°C and reacted for 6h. Nano aluminum oxide was added and ultrasonically dispersed for 0.5h, and the reaction was continued at 80°C for 6h. After centrifugal filtration, ethanol washing three times, and vacuum drying at 90°C, the modified nano filler M-BN-Al2O3-C8 was obtained.

[0165] The mass ratio of ricinoleic acid and tris-hydroxymethyl aminomethane is 2:1;

[0166] The mass ratio of nano boron nitride and nano aluminum oxide is 1:1;

[0167] The mass ratio between the total mass of ricinoleic acid and tris-hydroxymethyl aminomethane and the total mass of nano boron nitride and nano aluminum oxide is 1:0.5.

[0168] Comparative Preparation Example 9

[0169] Preparation of modified nano filler M-BN-Al2O3-C9:

[0170] (1) Ricinoleic acid phosphate, ricinoleic acid and tris-hydroxymethyl aminomethane were dissolved in tetrahydrofuran under nitrogen protection to form a solution with a mass concentration of 3%, and reacted at 80°C for 8h. After removing the solvent by rotary evaporation, a brownish sticky product was obtained;

[0171] (2) The brown viscous product is dissolved in a mixed solvent of ethanol / water with a volume ratio of 1:1 to form a solution with a mass concentration of 5%, and nano-boron nitride and nano-aluminum oxide are added and ultrasonically dispersed for 1 h, and then the temperature is raised to 80°C for reaction for 12 h. After centrifugal filtration, ethanol washing for three times and vacuum drying at 90°C, the modified nano filler M-BN-Al2O3-C9 is obtained.

[0172] The mass ratio of castor oil phosphate and castor oil acid is 3:1, and the mass ratio of the total mass of castor oil acid phosphate, castor oil acid and trimethylol aminomethane to the mass of nano-boron nitride is 1:0.5.

[0173] The mass ratio of nano-boron nitride and nano-aluminum oxide is 1:1.

[0174] The mass ratio of castor oil acid phosphate, castor oil acid and trimethylol aminomethane to nano-boron nitride is 1:0.5.

[0175] Comparative Preparation Example 10

[0176] Preparation of modified nano filler M-BN:

[0177] (1) Castor oil phosphate, castor oil acid and trimethylol aminomethane are dissolved in tetrahydrofuran under nitrogen protection to form a solution with a mass concentration of 3%, and then the temperature is raised to 80°C for reaction for 8 h. After removing the solvent by rotary evaporation, a brown viscous product is obtained.

[0178] (2) The brown viscous product is dissolved in a mixed solvent of ethanol / water with a volume ratio of 1:1 to form a solution with a mass concentration of 5%, and nano-boron nitride is added and ultrasonically dispersed for 0.5 h, and then the temperature is raised to 80°C for reaction for 6 h. After centrifugal filtration, ethanol washing for three times and vacuum drying at 90°C, the modified nano filler M-BN is obtained.

[0179] The mass ratio of castor oil phosphate and castor oil acid is 3:1, and the mass ratio of the total mass of castor oil acid phosphate, castor oil acid and trimethylol aminomethane to the mass of nano-boron nitride is 1:0.5.

[0180] The mass ratio of castor oil acid phosphate, castor oil acid and trimethylol aminomethane to nano-boron nitride is 1:0.5.

[0181] Comparative Preparation Example 11

[0182] Preparation of modified nano filler M-Al2O3:

[0183] (1) Castor oil phosphate, castor oil acid and trimethylol aminomethane are dissolved in tetrahydrofuran under nitrogen protection to form a solution with a mass concentration of 3%, and then the temperature is raised to 80°C for reaction for 8 h. After removing the solvent by rotary evaporation, a brown viscous product is obtained.

[0184] (2) The brownish viscous product is dissolved in a mixed solvent of ethanol / water with a volume ratio of 1:1 to form a solution with a mass concentration of 5%, and nano-aluminum oxide is added and ultrasonically dispersed for 0.5 h, and then the reaction is carried out at an elevated temperature of 80℃ for 6 h; after centrifugal filtration, ethanol washing is carried out three times, and vacuum drying is carried out at 90℃ to obtain the modified nano-filler M-Al2O3.

[0185] The mass ratio of castor oil phosphate and ricinoleic acid is 3:1; the mass ratio of ricinoleic acid phosphate, ricinoleic acid and trimethylol aminomethane is 2:1;

[0186] The mass ratio of the total mass of ricinoleic acid phosphate, ricinoleic acid and trimethylol aminomethane to nano-aluminum oxide is 1:0.5.

[0187] Example 1

[0188] A high-gloss gold-plated silver-plated steel plate cold rolling lubricating oil comprises the following components and mass fractions:

[0189] Palm oil 60 parts

[0190] Pentaerythritol oleate 30 parts

[0191] M-BN-Al2O3-10.3 parts

[0192] Extreme pressure agent oleyl polyoxyethylene ether phosphate 2.2 parts

[0193] Antioxidant Irganox L57 parts

[0194] Emulsifier OP-7 2 parts

[0195] The specific preparation method comprises the following steps:

[0196] S1: M-BN-Al2O3-1, extreme pressure agent oleyl polyoxyethylene ether phosphate and emulsifier OP-7 are sequentially added to a high-speed dispersing machine for stirring and mixing to obtain a first mixture A;

[0197] S2, palm oil and pentaerythritol oleate are mixed and then added into a container, and the temperature is raised to 75℃, then antioxidant Irganox L57 is added, and after uniform stirring, the temperature is lowered to 55℃ to obtain a second mixture B;

[0198] S3: The first mixture A obtained in step S1 is added to the first mixture B obtained in step S2, and uniform stirring is carried out to obtain the high-gloss gold-plated silver-plated steel plate cold rolling lubricating oil.

[0199] Examples 2-6

[0200] The modified nano filler M-BN-Al2O3-1 in Example 1 is replaced by M-BN-Al2O3-2, M-BN-Al2O3-3, M-BN-Al2O3-4, M-BN-Al2O3-5, M-BN-Al2O3-6 of Preparation Examples 2-6 respectively, and the rest is consistent with Example 1, to obtain the high-gloss gold-plated silver-plated steel plate cold rolling lubricating oil of Example 2-6.

[0201] Example 7

[0202] A high-gloss gold-plated silver-plated steel plate cold rolling lubricating oil comprises the following components and mass fractions:

[0203] Palm oil 60 parts

[0204] Pentaerythritol oleate 30 parts

[0205] M-BN-Al2O3-20.3 parts

[0206] Extreme pressure agent oleyl polyoxyethylene ether phosphate 4.5 parts

[0207] Antioxidant Irganox L57 parts

[0208] Emulsifier OP-7 2 parts

[0209] The specific preparation method comprises the following steps:

[0210] S1: M-BN-Al2O3-2, extreme pressure agent oleyl polyoxyethylene ether phosphate and emulsifier OP-7 are sequentially added to a high-speed disperser for stirring and mixing to obtain a first mixture A;

[0211] S2, the palm oil and pentaerythritol oleate are mixed and then added to a container, and the temperature is raised to 75℃, then the antioxidant Irganox L57 is added, and after stirring and mixing, the temperature is lowered to 55℃ to obtain a second mixture B;

[0212] S3: The first mixture A obtained in step S1 is added to the first mixture B obtained in step S2, and stirred uniformly to obtain the high-gloss gold-plated silver-plated steel plate cold rolling lubricating oil.

[0213] Comparative Examples 1-11

[0214] The modified nano filler M-BN-Al2O3-1 in Example 1 is replaced by the nano filler of Comparative Preparation Examples 1-11, and the rest is consistent with Example 1, to obtain the steel plate cold rolling lubricating oil of Comparative Examples 1-11.

[0215] Comparative Example 12

[0216] A steel plate cold rolling lubricating oil comprises the following components and mass fractions:

[0217] Palm oil 60 parts

[0218] Pentaerythritol oleate 30 parts

[0219] M-BN-Al203-12.5 parts

[0220] Antioxidant Irganox L57 parts

[0221] Emulsifier OP-7 2 parts

[0222] The specific preparation method comprises the following steps:

[0223] S1: M-BN-Al203-1 and emulsifier OP-7 are sequentially added to a high-speed dispersing machine for stirring and mixing to obtain a first mixture A;

[0224] S2, palm oil and pentaerythritol oleate are mixed and then added into a container, and then heated to 75℃, then antioxidant Irganox L57 is added, and then stirred and mixed to obtain a second mixture B;

[0225] S3: The first mixture A obtained in step S1 is added into the first mixture B obtained in step S2, and then stirred and mixed to obtain the steel plate cold rolling lubricating oil.

[0226] Comparative example 13

[0227] A steel plate cold rolling lubricating oil comprises the following components and mass fractions:

[0228] Palm oil 60 parts

[0229] Pentaerythritol oleate 30 parts

[0230] Extreme pressure agent oleyl polyoxyethylene ether phosphate 2.5 parts

[0231] Antioxidant Irganox L57 parts

[0232] Emulsifier OP-7 2 parts

[0233] The specific preparation method comprises the following steps:

[0234] S1: The extreme pressure agent oleyl polyoxyethylene ether phosphate and the emulsifier OP-7 are sequentially added to a high-speed dispersing machine for stirring and mixing to obtain a first mixture A;

[0235] S2, palm oil and pentaerythritol oleate are mixed and then added into a container, and then heated to 75℃, then antioxidant Irganox L57 is added, and then stirred and mixed to obtain a second mixture B;

[0236] S3: adding the first mixture A obtained in step S1 into the first mixture B obtained in step S2, and stirring to obtain the steel plate cold rolling lubricating oil.

[0237] Comparative Example 14

[0238] A steel plate cold rolling lubricating oil comprises the following components and mass fractions:

[0239] Palm oil 60 parts

[0240] Pentaerythritol oleate 30 parts

[0241] M-BN-Al203-20.3 parts

[0242] Extreme pressure agent oleyl polyoxyethylene ether phosphate 6 parts

[0243] Antioxidant Irganox L57 parts

[0244] Emulsifier OP-7 2 parts

[0245] The specific preparation method comprises the following steps:

[0246] S1: adding M-BN-Al203-2, extreme pressure agent oleyl polyoxyethylene ether phosphate and emulsifier OP-7 into a high-speed disperser in sequence and stirring to obtain a first mixture A;

[0247] S2: mixing palm oil and pentaerythritol oleate, adding into a container, and heating to 75°C, then adding antioxidant Irganox L57, stirring to obtain a second mixture B, and cooling to 55°C;

[0248] S3: adding the first mixture A obtained in step S1 into the first mixture B obtained in step S2, and stirring to obtain the steel plate cold rolling lubricating oil.

[0249] Performance test:

[0250] The rolling lubricating oils of each example and comparative example are used to roll stainless steel on a reversible rolling mill of American I 2 S company, the rolling speed is 800 m / min, ammonia decomposition gas is used as annealing protective gas, the rolling specification is 1 mm, no cleaning and degreasing process is used, and the obtained stainless steel is directly annealed, and the performance of the stainless steel is tested.

[0251] Surface roughness Ra value test: a stylus profilometer is used for testing;

[0252] Glossiness test: a glossiness tester is used for testing at an incident angle of 60°;

[0253] Reflectivity: a spectrophotometer is used for testing.

[0254] The test results are shown in Table 1 below:

[0255] Table 1

[0256]

[0257]

[0258] As can be seen from Examples 1-7 and Comparative Examples 1-14 in Table 1, the modified nano-filler is added to the steel sheet cold rolling lubricating oil, and the surfactant obtained by the reaction of castor oil phosphate, castor oil acid and tris-hydroxymethyl aminomethane is used to perform surface activity treatment on the layered nano-boron nitride and spherical nano-alumina (the long chain end of the surfactant provides steric hindrance, and the amino and / or hydroxyl group at the other end is bonded or adsorbed to the surface of the nano-filler), and then through the synergistic effect between the modified nano-filler and the extreme pressure agent, the final rolling lubricating oil is used for the rolling of stainless steel sheets, and after annealing without using a cleaning and degreasing process, the obtained stainless steel has a surface roughness Ra≤0.065 μm, a glossiness ≥500 GU, and a reflectivity ≥90%, and has excellent high glossiness and mirror effect.

[0259] As can be seen from Examples 1-7 and Comparative Examples 1-2 and 7-8 in Table 1, when either the castor oil phosphate or the castor oil acid is added, or the ratio of the two is not within the preferred range of the present application, the properties of the final rolled stainless steel are all decreased to a certain extent, which indicates that the castor oil phosphate and the castor oil acid have a synergistic effect, and the reaction of the castor oil phosphate and the castor oil acid with the tris-hydroxymethyl aminomethane has a competitive effect on the properties of the final rolling oil.

[0260] As can be seen from Examples 1-7 and Comparative Examples 3-4 in Table 1, when the mass ratio of the castor oil acid phosphate and the castor oil acid to the tris-hydroxymethyl aminomethane is not within the preferred range of the present application, the overall rolling effect of the rolling oil is deteriorated, which indicates that the different reaction degrees of the castor oil acid phosphate and the castor oil acid with the tris-hydroxymethyl aminomethane affect the overall performance of the subsequent rolling oil.

[0261] As can be seen from Examples 1-7 and Comparative Examples 5, 10-11 in Table 1, when either the layered nano-boron nitride or the spherical nano-alumina is added, or the ratio of the two is not within the preferred range of the present application, the properties of the final rolled stainless steel are all decreased to a certain extent, which indicates that the layered nano-boron nitride and the spherical nano-alumina have a synergistic effect, and it is possible that the spherical nano-alumina is partially inserted into the layered nano-boron nitride, which affects the performance of the subsequent rolling oil.

[0262] From the comparison of examples 1-7 and comparative example 6 in table 1, it can be seen that when the mass ratio of surfactant to nano filler is not within the range defined by the present application during the preparation of modified nano filler, the properties of the final rolled stainless steel are all decreased to a certain extent, which shows that the surface modification of nano filler by surfactant affects the performance of subsequent rolling oil.

[0263] From the comparison of examples 1-7 and comparative example 9 in table 1, it can be seen that when nano boron nitride and nano aluminum oxide are surface modified together by one-pot method during the preparation of modified nano filler, the properties of the final rolled stainless steel are all decreased to a certain extent compared with surface modification respectively, which shows that reaction competition occurs during the surface treatment of nano filler, resulting in the deterioration of treatment effect.

[0264] From the comparison of examples 1-7 and comparative examples 12-14 in table 1, it can be seen that a synergistic effect occurs between modified nano filler and extreme pressure agent in rolling lubricating oil, which improves the rolling effect of rolling lubricating oil, which shows that the organic chain in the surface treated modified nano filler has good compatibility and wetting effect on steel, which affects the performance of subsequent rolling oil.

[0265] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the embodiments of the present application, but not to limit them. Although the embodiments of the present application have been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the embodiments of the present application can still be modified or replaced by equivalents, and these modifications or replacements cannot make the modified technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A high-gloss gold-plated and silver-plated steel sheet cold-rolled lubricating oil, characterized in that, Includes the following components and their mass fractions: Base oil 60-95 parts; 0.3-1 part of modified nanofiller; Extreme pressure agent 2-15 parts; Antioxidant 0.5-1.5 parts; 1-3 parts emulsifier; The mass ratio of the modified nanofiller to the extreme pressure agent is 1:(7-15). The modified nanofiller is a surfactant-modified nano-boron nitride and nano-alumina composite obtained by reacting castor oil phosphate, castor oil acid and tris(hydroxymethyl)aminomethane.

2. The high-gloss gold-plated and silver-plated steel sheet cold-rolling lubricating oil according to claim 1, characterized in that, The base oil includes natural oils and synthetic esters; the extreme pressure agent is selected from one or more of sulfurized esters, alkyl polysulfides and phosphate esters; the antioxidant is selected from one or more of phenolic antioxidants, amine antioxidants and sulfur-phosphorus compound antioxidants; the emulsifier is selected from one or more of fatty acid polyoxyethylene ethers, alkylphenol polyoxyethylene ethers and fatty alcohol polyoxyethylene ethers.

3. The high-gloss gold-plated and silver-plated steel sheet cold-rolling lubricating oil according to claim 2, characterized in that, The natural oils are selected from one or more of palm oil, coconut oil, castor oil, butter, and lard; The synthetic ester is selected from one or more of pentaerythritol oleate, pentaerythritol stearate, trimethylolpropane oleate, trimethylolpropane lauryl ester, isooctyl stearate, and palm oil isooctyl ester. The mass ratio of the natural oils to the synthetic esters is (2-4):1; The phenolic antioxidant is selected from one or both of T501 or Irganox L135; the amine antioxidant is selected from Irganox L57 or Irganox L06; and the sulfur-phosphorus compound antioxidant is selected from T309 or ZDDP.

4. The high-gloss gold-plated and silver-plated steel sheet cold-rolling lubricating oil according to claim 1, characterized in that, The mass ratio of castor oil phosphate to castor oil acid is (2-5):1; The mass ratio of ricinoleate phosphate and ricinoleic acid to tris(hydroxymethyl)aminomethane is (2-3):1; The mass ratio between the total mass of ricinoleate phosphate, ricinoleic acid, and tris(hydroxymethyl)aminomethane and the total mass of nano-boron nitride and nano-alumina is 1:(0.3-0.5). The compounding ratio of the nano boron nitride and nano aluminum oxide is (1-2):1; The average particle size of the boron nitride nanoparticles is 50-100 nm; the alumina nanoparticles are γ-Al2O3 with an average particle size of 30-50 nm.

5. The high-gloss gold-plated and silver-plated steel sheet cold-rolling lubricating oil according to claim 1, characterized in that, The preparation method of the modified nanofiller includes the following steps: (1) Synthesis of surfactant: Castor oil phosphate, castor oil acid and tris(hydroxymethyl)aminomethane were reacted under nitrogen protection with tetrahydrofuran as solvent at 80℃-90℃ for 8-10h. After removing the solvent by rotary evaporation, a brownish-brown viscous product was obtained. (2) Dissolve the above brownish viscous product in a 1:1 volume ratio of ethanol / water mixed solvent, add nano boron nitride and ultrasonically disperse for 0.5-1h, heat to 60-80℃ and react for 4-6h, then add nano alumina and ultrasonically disperse for 0.5-1h, and continue to react at 60-80℃ for 4-6h; then centrifuge, filter, wash and dry to obtain the modified nanofiller.

6. The high-gloss gold-plated and silver-plated steel sheet cold-rolling lubricating oil according to claim 5, characterized in that, The mass concentration of ricinoleate phosphate, ricinoleic acid and tris(hydroxymethyl)aminomethane in tetrahydrofuran is 3%-5%; In step (2), the mass concentration of the brownish-black viscous product in the ethanol / water mixed solvent is 5-10%.

7. A method for preparing a high-gloss gold-plated and silver-plated steel sheet cold-rolling lubricating oil according to any one of claims 1-6, characterized in that, Includes the following steps: S1. The modified nanofiller, extreme pressure agent and emulsifier are mixed to obtain the first mixture A; S2. Mix the base oils and add antioxidants to obtain the second mixture B; S3. Mix the first mixture A with the second mixture B to obtain the high-gloss gold-plated and silver-plated steel sheet cold rolling lubricating oil.

8. The method for preparing the high-gloss gold-plated and silver-plated steel sheet cold-rolling lubricating oil according to claim 7, characterized in that, The specific preparation steps of the preparation method are as follows: S1: Modified nanofiller, extreme pressure agent and emulsifier are added to a high-speed disperser in sequence and stirred to obtain the first mixture A; S2. Mix the base oils and add them to a container. Heat the mixture to 75-95°C, then add the antioxidant. Stir well and then cool the mixture to 45-65°C to obtain the second mixture B. S3: Add the first mixture A obtained in step S1 to the first mixture B obtained in step S2, and stir evenly to obtain the high-gloss gold-plated and silver-plated steel plate cold rolling lubricating oil.

9. The application of a high-gloss gold-plated and silver-plated steel sheet cold rolling lubricant as described in any one of claims 1-6 or a high-gloss gold-plated and silver-plated steel sheet cold rolling lubricant prepared by the method described in any one of claims 7-8 in improving the surface gloss of gold-plated and silver-plated steel sheets.

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