阅读说明：本技术 一种制备耐老化防腐防污润滑油的方法 (Method for preparing anti-aging, anti-corrosion and anti-fouling lubricating oil ) 是由 申慧君 于 2019-10-10 设计创作，主要内容包括：本发明公开了一种制备耐老化防腐防污润滑油的方法,将聚天冬氨酸溶解于缓冲溶液中,加入硬脂酸钠有机化改性水滑石,超声分散后磁力搅拌,离心、水洗,再分散于硝酸铈水溶液中,超声分散后磁力搅拌,离心、水洗,得铈离子-硬脂酸钠复配改性水滑石；将二水合氯化铜、聚乙二醇加入去离子水中溶解,滴加氢氧化钠溶液、葡萄糖溶液,再加入改性纳米氧化锌,搅拌反应后,滴加氯化钠溶液,恒温搅拌反应,过滤、洗涤,真空干燥,研磨得防污微胶囊；将纳米二氧化铈、纳米蛇纹石混合,加入复配表面活性剂,超声分散得润滑添加剂,将其加入润滑油基础油中,再与铈离子-硬脂酸钠复配改性水滑石、防污微胶囊混合均匀,制得所述耐老化防腐防污润滑油。(The invention discloses a method for preparing anti-aging, anti-corrosion and anti-fouling lubricating oil, which comprises the steps of dissolving polyaspartic acid in a buffer solution, adding sodium stearate organic modified hydrotalcite, magnetically stirring after ultrasonic dispersion, centrifuging, washing, dispersing in a cerium nitrate aqueous solution, magnetically stirring after ultrasonic dispersion, centrifuging, washing to obtain cerium ion-sodium stearate compound modified hydrotalcite; adding copper chloride dihydrate and polyethylene glycol into deionized water for dissolving, dropwise adding a sodium hydroxide solution and a glucose solution, then adding modified nano zinc oxide, stirring for reaction, dropwise adding a sodium chloride solution, stirring for reaction at constant temperature, filtering, washing, vacuum drying, and grinding to obtain the antifouling microcapsule; mixing nano cerium dioxide and nano serpentine, adding a compound surfactant, performing ultrasonic dispersion to obtain a lubricating additive, adding the lubricating additive into lubricating oil base oil, and uniformly mixing the lubricating additive with cerium ion-sodium stearate compound modified hydrotalcite and antifouling microcapsules to obtain the anti-aging, anti-corrosion and antifouling lubricating oil.)

1. The method for preparing the anti-aging, anti-corrosion and anti-fouling lubricating oil is characterized by comprising the following steps of:

(1) compounding and modifying hydrotalcite:

dissolving 0.2-0.3 part of polyaspartic acid in 200-300 parts of buffer solution with the pH value of 8-9, adding 2-3 parts of sodium stearate organic modified hydrotalcite, performing ultrasonic dispersion for 5-10min, then performing magnetic stirring for 30-40min, centrifuging, washing for 3-5 times, dispersing in 80-120 parts of cerium nitrate aqueous solution, performing ultrasonic dispersion for 5-10min, then performing magnetic stirring for 1-2h, centrifuging, washing for 3-5 times, and thus obtaining cerium ion-sodium stearate compound modified hydrotalcite;

(2) preparation of antifouling microcapsules:

adding 2-4 parts of copper chloride dihydrate and 0.3-0.6 part of polyethylene glycol into 10-20 parts of deionized water for dissolving, heating to 70-75 ℃, dropwise adding 4-8 parts of sodium hydroxide solution and 4-8 parts of glucose solution, then adding 1-2 parts of modified nano zinc oxide, stirring for reacting for 20-30min, dropwise adding 5-10 parts of sodium chloride solution, stirring for reacting for 30-60min at constant temperature, filtering, washing for 2-3 times with absolute ethyl alcohol and deionized water, vacuum drying for 2-3h at 45-50 ℃, and grinding to obtain the antifouling microcapsule;

(3) preparing the anti-aging, anti-corrosion and anti-fouling lubricating oil:

mixing 1-2 parts of nano cerium dioxide and 1-2 parts of nano serpentine, adding 2-4 parts of compound surfactant, performing ultrasonic dispersion for 30-40min to obtain a modified nano cerium dioxide-serpentine lubricating additive, adding the modified nano cerium dioxide-serpentine lubricating additive into 80-90 parts of lubricating oil base oil, and uniformly mixing the modified nano cerium dioxide-serpentine lubricating additive with the materials obtained in the steps (1) and (2) to obtain the anti-aging, anti-corrosion and anti-fouling lubricating oil.

2. The method for preparing the aging-resistant, anti-corrosion and anti-fouling lubricating oil according to claim 1, wherein the preparation of the sodium stearate organic modified hydrotalcite in the step (1): adding deionized water and 0.12-0.18 part of sodium stearate into 2-3 parts of hydrotalcite at a ratio of 1:5, heating in water bath to 80-85 ℃, stirring for 1-2h, filtering, washing to neutrality, and drying at 80-85 ℃ to constant weight to obtain sodium stearate organic modified hydrotalcite;

the buffer solution consists of 0.05mol/L Tris-HCl and 0.15mol/L NaCl, and the concentration of the cerous nitrate aqueous solution is 0.1-0.2 mol/L.

3. The method for preparing the aging-resistant, anti-corrosion and anti-fouling lubricating oil according to claim 1, wherein the preparation of the modified nano zinc oxide in the step (2): uniformly mixing 0.05-0.1 part of titanate coupling agent HW201 and 6-12 parts of isopropanol, adding 1-2 parts of nano zinc oxide, stirring for 1-2 hours at high speed by magnetic force, filtering, drying in vacuum, and grinding into powder to obtain modified nano zinc oxide;

the mass fractions of the sodium hydroxide solution, the glucose solution and the sodium chloride solution are respectively 20%, 30% and 25%.

4. The method for preparing the anti-aging, anti-corrosion and anti-fouling lubricating oil according to claim 1, wherein the preparation of the nano serpentine in the step (3): crushing the blocky serpentine into powder by using an ore crusher, and then putting the powder into a ball milling tank for ball milling to prepare the nano serpentine; the compound surfactant is prepared by mixing tween 80 and span 80 according to the mass ratio of 1: 1.

Technical Field

The invention belongs to the field of lubricating oil, and particularly relates to a method for preparing anti-aging, anti-corrosion and anti-fouling lubricating oil.

Background

The lubricant is made by mixing a base oil and an additive, about 95% of the base oil being a mineral oil derived from petroleum. The mineral lubricant has poor biodegradability, soil can be directly polluted when the mineral lubricant runs off in the environment, 1kg of petroleum-based lubricant can pollute 1000000L of water, and meanwhile, due to the gradual reduction and non-regenerability of the mineral oil, the development of environment-friendly lubricants is imperative. Vegetable oil-based lubricants, known as "biolubricants," are biodegradable, renewable, non-toxic, and, in addition, have a variety of performance advantages, such as good lubricity, high viscosity index, high flash point, and the like. However, vegetable oil base oils have poor oxidative stability due to the presence of C = C bonds as unsaturated bonds in the fatty acid chains of vegetable oils, and this problem can be solved by reducing the unsaturation of vegetable oils by chemical modification, the hydrogenation of vegetable oils being a common modification method.

Most of commercially available lubricating oil has the defects of poor aging resistance, corrosion resistance and antifouling performance, and the invention provides a preparation method of the aging resistance, corrosion resistance and antifouling lubricating oil.

Disclosure of Invention

The invention aims to solve the existing problems and provides a method for preparing an anti-aging, anti-corrosion and anti-fouling lubricating oil, and the modified lubricating oil prepared according to the method has excellent anti-aging, anti-corrosion and anti-fouling properties.

The invention is realized by the following technical scheme:

a method for preparing anti-aging, anti-corrosion and anti-fouling lubricating oil comprises the following steps of:

(1) compounding and modifying hydrotalcite:

dissolving 0.2-0.3 part of polyaspartic acid in 200-300 parts of buffer solution with the pH value of 8-9, adding 2-3 parts of sodium stearate organic modified hydrotalcite, performing ultrasonic dispersion for 5-10min, then performing magnetic stirring for 30-40min, centrifuging, washing for 3-5 times, dispersing in 80-120 parts of cerium nitrate aqueous solution, performing ultrasonic dispersion for 5-10min, then performing magnetic stirring for 1-2h, centrifuging, washing for 3-5 times, and thus obtaining cerium ion-sodium stearate compound modified hydrotalcite;

sodium stearate is used as a surface organic modifier of the hydrotalcite, and the sodium stearate organic modified hydrotalcite is prepared by a wet modification method, so that the thermal oxidation aging resistance and ultraviolet aging resistance of the lubricating oil can be obviously improved; the aspartic acid is deposited on the surface of the hydrotalcite by utilizing the electrostatic action, the aspartic acid is used as a cross-linking agent to be complexed with trivalent cerium ions of a corrosion inhibitor, the modification of the surface of the hydrotalcite is completed through the electrostatic action self-assembly and the complexing action, the modified hydrotalcite is dispersed in lubricating oil, the obvious self-repairing effect can be achieved, and the aging resistance and the corrosion resistance of the lubricating oil can be improved;

(2) preparation of antifouling microcapsules:

adding 2-4 parts of copper chloride dihydrate and 0.3-0.6 part of polyethylene glycol into 10-20 parts of deionized water for dissolving, heating to 70-75 ℃, dropwise adding 4-8 parts of sodium hydroxide solution and 4-8 parts of glucose solution, then adding 1-2 parts of modified nano zinc oxide, stirring for reacting for 20-30min, dropwise adding 5-10 parts of sodium chloride solution, stirring for reacting for 30-60min at constant temperature, filtering, washing for 2-3 times with absolute ethyl alcohol and deionized water, vacuum drying for 2-3h at 45-50 ℃, and grinding to obtain the antifouling microcapsule;

the modified nano zinc oxide is prepared by taking the titanate coupling agent as a modifier, so that the corrosion resistance and the antifouling property of the lubricating oil can be effectively improved; the method comprises the steps of premixing polyethylene glycol and copper chloride, dropwise adding sodium chloride solution serving as a coagulant, taking the polyethylene glycol as a continuous wall material on the basis of synthesizing cuprous oxide by a glucose liquid phase reduction method, and coating the polyethylene glycol on the surface of the cuprous oxide by a single coagulation method to prepare the microcapsule with an obvious slow release effect, wherein the microcapsule can solve the 'burst release' problem of common cuprous oxide and zinc oxide, can effectively control the release speed of the antifouling agent, further reduces environmental pollution and prolongs the antifouling period;

(3) preparing the anti-aging, anti-corrosion and anti-fouling lubricating oil:

mixing 1-2 parts of nano cerium dioxide and 1-2 parts of nano serpentine, adding 2-4 parts of compound surfactant, performing ultrasonic dispersion for 30-40min to obtain a modified nano cerium dioxide-serpentine lubricating additive, adding the modified nano cerium dioxide-serpentine lubricating additive into 80-90 parts of lubricating oil base oil, and uniformly mixing the modified nano cerium dioxide-serpentine lubricating additive with the materials obtained in the steps (1) and (2) to obtain the anti-aging, anti-corrosion and anti-fouling lubricating oil;

nanometer rare earth compound nanometer cerium dioxide and silicate serpentine are used as lubricating additives and added into lubricating oil base oil, Tween 80 and span 80 are used as compound surfactants to modify the nanometer cerium dioxide and the serpentine, the compound surfactants have good adsorption effect on the nanometer cerium dioxide and the nanometer serpentine, a steric hindrance stabilizing mechanism is formed, the modifying effect is good, the friction coefficient and the wear scar diameter of the lubricating oil are reduced, the nanometer particles enter into a friction pair in the friction and wear process, scratches generated by filling friction are repaired in time, and the anti-wear and anti-friction effects are achieved.

Further, in the step (1), the preparation of the sodium stearate organic modified hydrotalcite: adding deionized water and 0.12-0.18 part of sodium stearate into 2-3 parts of hydrotalcite at a ratio of 1:5, heating in water bath to 80-85 ℃, stirring for 1-2h, filtering, washing to neutrality, and drying at 80-85 ℃ to constant weight to obtain sodium stearate organic modified hydrotalcite;

the buffer solution consists of 0.05mol/L Tris-HCl and 0.15mol/L NaCl, and the concentration of the cerous nitrate aqueous solution is 0.1-0.2 mol/L.

Further, the preparation of the modified nano zinc oxide in the step (2): uniformly mixing 0.05-0.1 part of titanate coupling agent HW201 and 6-12 parts of isopropanol, adding 1-2 parts of nano zinc oxide, stirring for 1-2 hours at high speed by magnetic force, filtering, drying in vacuum, and grinding into powder to obtain modified nano zinc oxide;

the mass fractions of the sodium hydroxide solution, the glucose solution and the sodium chloride solution are respectively 20%, 30% and 25%.

Further, the preparation of the nano serpentine in the step (3): crushing the blocky serpentine into powder by using an ore crusher, and then putting the powder into a ball milling tank for ball milling to prepare the nano serpentine;

the compound surfactant is prepared by mixing tween 80 and span 80 according to the mass ratio of 1: 1.

Compared with the prior art, the invention has the following advantages:

(1) sodium stearate is used as a surface organic modifier of the hydrotalcite, and the sodium stearate organic modified hydrotalcite is prepared by a wet modification method, so that the thermal oxidation aging resistance and ultraviolet aging resistance of the lubricating oil can be obviously improved; and then, the aspartic acid is deposited on the surface of the hydrotalcite by utilizing the electrostatic action, the aspartic acid is used as a cross-linking agent to be complexed with trivalent cerium ions of a corrosion inhibitor, the modification of the surface of the hydrotalcite is completed through the electrostatic action self-assembly and the complexing action, and the modified hydrotalcite is dispersed in lubricating oil, so that the obvious self-repairing effect can be achieved, and the aging resistance and the corrosion resistance of the lubricating oil can be improved.

(2) The modified nano zinc oxide is prepared by taking the titanate coupling agent as a modifier, so that the corrosion resistance and the antifouling property of the lubricating oil can be effectively improved; the method comprises the steps of premixing polyethylene glycol and copper chloride, dropwise adding sodium chloride solution serving as a coagulant, taking the polyethylene glycol as a continuous wall material on the basis of synthesizing cuprous oxide by a glucose liquid phase reduction method, and coating the polyethylene glycol on the surface of the cuprous oxide by a single coagulation method to prepare the microcapsule with an obvious slow release effect.

(3) Nanometer rare earth compound nanometer cerium dioxide and silicate serpentine are used as lubricating additives and added into lubricating oil base oil, Tween 80 and span 80 are used as compound surfactants to modify the nanometer cerium dioxide and the serpentine, the compound surfactants have good adsorption effect on the nanometer cerium dioxide and the nanometer serpentine, a steric hindrance stabilizing mechanism is formed, the modifying effect is good, the friction coefficient and the wear scar diameter of the lubricating oil are reduced, the nanometer particles enter into a friction pair in the friction and wear process, scratches generated by filling friction are repaired in time, and the anti-wear and anti-friction effects are achieved.

Detailed Description