CN114317069B - Vegetable oil-based nano lubricating oil additive and preparation method thereof - Google Patents

Abstract

The invention discloses a vegetable oil-based nano lubricating oil additive and a preparation method thereof, belonging to the technical field of lubricating oil. The lubricating oil additive comprises 10-20 parts of base oil, 1-3 parts of surfactant, 1-3 parts of repair nano particles, 0.5-1.5 parts of superfine boron nitride, 0.1-0.5 part of preservative and 0.3-0.5 part of bactericide. The method for preparing the repairing nano particles comprises the steps of preparing a Cu-graphene oxide compound by an in-situ synthesis method, adding superfine boron nitride, reducing agglomeration, effectively filling surface scratches and reducing mechanical damage, and realizing the effects of reducing abrasion and resisting abrasion by the synergistic effect of the Cu-graphene oxide compound and the superfine boron nitride. The additive is suitable for various lubricating oils, has small addition amount, obvious lubricating effect, safe, environment-friendly and pollution-free raw materials and low cost, has wide economic and social benefits, and is worthy of large-scale popularization and application.

Description

A kind of vegetable oil-based nano lubricating oil additive and preparation method thereof

technical field

The invention belongs to the technical field of lubricating oil, and in particular relates to a vegetable oil-based nano lubricating oil additive and a preparation method thereof.

Background technique

Friction is an unavoidable natural phenomenon. The fuel used to reduce friction and wear of mechanical parts accounts for 1/3 of the total fuel consumption. In addition, friction can also cause useless loss of mechanical energy, shorten machine life, and reduce mechanical efficiency. . In order to solve the above problems, it is particularly important to find substances that can reduce friction and wear, so lubricating oil is often added, and in order to improve the tribological properties of lubricating oil, appropriate additives are often added to lubricating oil.

Lubricating oil additives refer to a single agent or a mixture of several single agents that are mixed according to a certain proportion and blending technology and can meet certain quality requirements. In the field of lubrication, zinc dialkyldithiophosphate (ZDDP) is the most widely used multifunctional lubricant additive, but due to the corrosion of metal by zinc ions and the pollution of phosphorus to the environment, it is necessary to develop environmentally friendly and effective lubricants. Additives have become a research hotspot in this field.

Nanotechnology is considered to be a new technology facing the 21st century, and its excellent characteristics have attracted extensive attention of scientific researchers. In recent years, nanomaterials have shown important application value and broad application prospects in the fields of optics, electricity, and magnetism. At the same time, because nanoparticles have many excellent properties that traditional conventional materials do not have, they exhibit special and excellent physical The chemical properties have entered everyone's field of vision. As a lubricating oil additive, the advantages of nanoparticles are mainly reflected in the following three aspects: First, the diffusion ability and self-diffusion ability of nanoparticles are strong, and it is easy to form a penetration layer or diffusion layer with good anti-wear performance on the metal surface to reduce Friction and anti-wear effect; the second is that nanoparticles have the characteristics of small particle size, which is approximately spherical in shape, and can roll between friction pairs, playing a role similar to "ball bearings", and the friction form changes from sliding friction to rolling The friction reduces the friction coefficient; the third is that nanoparticles can polish and strengthen the friction surface, and support external loads to increase the bearing capacity.

However, the extremely fine grains of nanoparticles cause the particles to have huge surface energy, coupled with the attractive force between the particles, the tendency of the particles to self-aggregate is very large, and larger block aggregates can be formed after a certain period of time, so in There is a problem of poor dispersion stability in oil products. _In addition, the lubricant containing MoS2 may chemically interact with the contact surface, thereby generating frictional heat, causing oxidation, and negatively affecting the oxidation stability of the oil; when the lubricant contains organic PTFE, the thermal conductivity and oxidation resistance of the lubricating oil will get worse.

In addition, as lubricating oil additives, nanoparticles have a single function, and the nanoparticles are agglomerated and dispersed unevenly in the base oil, resulting in poor anti-wear and anti-friction effects, and cannot achieve a good lubricating effect.

Contents of the invention

Aiming at the problems existing in the prior art, the present invention provides a vegetable oil-based nano lubricating oil additive and a preparation method thereof, which are safe, environmentally friendly and pollution-free, have good stability and strong dispersibility, and ensure a good grinding-aiding and lubricating effect while possessing A certain self-healing function.

For realizing above-mentioned technical purpose, the technical scheme that the present invention adopts is:

A vegetable oil-based nano lubricating oil additive, which is prepared from the following raw materials in parts by weight: 10-20 parts of base oil, 1-3 parts of surfactant, 1-3 parts of repairing nanoparticles, and 0.5-1.5 parts of superfine boron nitride parts, preservatives 0.1-0.5 parts, fungicides 0.3-0.5 parts.

Preferably, the base oil is one or more of corn oil, peanut oil or soybean oil.

Preferably, the surfactant is Tween 60 or polyoxyethylene polyoxypropylene pentaerythritol ether.

Preferably, the preparation method of the repaired nanoparticles is as follows: uniformly disperse graphene oxide in the absolute ethanol solution according to the mass volume ratio of 1-5g:50ml, and add 1-5% of the mass of the mixed solution under continuous stirring to a concentration of 1mol /L copper chloride solution, then add 1-octadecene with a mass of 0.1-0.5% of the mixed solution, then put it into a high-pressure homogenizer, and circulate it for 5-10 times under the condition of 20-30MPa. °C in a vacuum oven for 24-48 hours to obtain repaired nanoparticles.

Preferably, the preparation method of the ultra-fine boron nitride is as follows: soak boron nitride powder in sodium hydroxide solution, heat to boiling, and keep boiling for 30-60 minutes, and then add 0.1-0.3% of the mixed liquid γ—Aminopropyltriethoxysilane, keep stirring for 30-60min and then dry, add the dried solid powder into a planetary ball mill, the speed of the ball mill is 200-300 rpm, and ball mill for 24-48h to obtain super fine boron nitride.

Preferably, the dosage ratio of the boron nitride and the sodium hydroxide solution is 10g:50mL, and the concentration of the sodium hydroxide solution is 1mol/L.

Preferably, the preservative is potassium sorbate.

Preferably, the fungicide is isothiazolinone.

A preparation method of vegetable oil-based nano lubricating oil additive, comprising the following steps:

(1) Preparation of repairing nanoparticles: disperse graphene oxide evenly in anhydrous ethanol solution according to the mass volume ratio of 1-5g: 50ml, and add 1-5% of the mass of the mixed solution under constant stirring. Copper solution, then add 1-octadecene with a mass of 0.1-0.5% of the mixed solution, then put it into a high-pressure homogenizer, circulate it for 5-10 times under the condition of 20-30MPa, and dry the product in a vacuum oven at 50-70°C Dry for 24-48 hours to get repaired nanoparticles;

(2) Preparation of ultra-fine boron nitride: Soak boron nitride powder in sodium hydroxide solution, heat to boiling, and keep boiling for 30-60 minutes, then add γ-aminopropyl with a mass of 0.1-0.3% of the mixed solution Triethoxysilane, continuously stirred for 30-60 minutes, then dried, added the dried solid powder into a planetary ball mill, the speed of the ball mill was 200-300 rpm, and ball milled for 24-48 hours to obtain ultrafine boron nitride;

(3) Heat the base oil to 80-90°C, add surfactants, repairing nanoparticles, ultra-fine boron nitride, preservatives, and fungicides in sequence under stirring, keep stirring at constant temperature for 12-24 hours, and then cool down naturally , to obtain the vegetable oil-based nano lubricating oil additive.

All raw materials of the present invention are commercially available, and the additive of the present invention is used as a lubricating oil admixture, and can be added to commercially available lubricating oil, and the dosage is 0.1-0.5% of the mass of the lubricating oil.

Beneficial effect

The invention uses vegetable oil as base oil to prepare a lubricating oil additive with good dispersibility and strong stability. The invention prepares repairing nanoparticles, and prepares Cu-graphene oxide composites by in-situ synthesis method. With the help of graphene oxide, Cu nanoparticles can be better electrostatically adsorbed during the friction process, so that it is easier to form thin Protective film to reduce friction damage. At the same time, the present invention adds ultrafine boron nitride, which has a sheet structure similar to graphite, and boron nitride modified by γ-aminopropyltriethoxysilane can promote repairing nanoparticles with similar structure The uniform dispersion reduces agglomeration. At the same time, it can effectively fill surface scratches and reduce mechanical damage. The two work together to achieve anti-wear and anti-wear effects. In addition, the addition of preservatives can improve the stability of the vegetable oil system, and the addition of fungicides can assist preservatives to reduce the effect of microorganisms and prolong the service life of lubricating oil.

The lubricating oil additive of the present invention is suitable for adding various lubricating oils, and the additive amount is small, the lubricating effect is remarkable, the raw material is safe, environmentally friendly, pollution-free, low in cost, has extensive economic and social benefits, and is worthy of large-scale popularization and application.

Description of drawings

Fig. 1 is a graph showing the appearance of wear scars of test samples using Example 4 and Comparative Examples 1-3 as lubricating oil additives for test performance testing.

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with specific embodiments, but are not limited thereto.

Example 1

A vegetable oil-based nano lubricating oil additive, prepared from the following raw materials in parts by weight: 10 parts of base oil, 1 part of surfactant, 1 part of repairing nanoparticles, 0.5 part of ultrafine boron nitride, 0.1 part of preservative, bactericidal 0.3 parts.

The base oil is corn oil.

The surfactant is Tween 60.

The preparation method of the repaired nanoparticles is as follows: uniformly disperse graphene oxide in absolute ethanol solution according to the mass volume ratio of 1g:50ml, and add copper chloride solution with a concentration of 1mol/L of 1% of the mass of the mixed solution under continuous stirring , and then add 0.1% 1-octadecene to the mixed solution, then put it into a high-pressure homogenizer, circulate it for 5 times under the condition of 20MPa, and dry the product in a vacuum oven at 50-70°C for 24h to obtain repaired nanoparticles.

The preparation method of the ultrafine boron nitride is as follows: soak boron nitride powder in sodium hydroxide solution, heat to boiling, and keep boiling for 30 minutes, then add γ-aminopropyltriethyl Oxysilane was dried after stirring continuously for 30 minutes, and the dried solid powder was added to a planetary ball mill at a speed of 200 rpm, and ball milled for 24 hours to obtain ultrafine boron nitride.

The amount ratio of the boron nitride and the sodium hydroxide solution is 10g:50mL, and the concentration of the sodium hydroxide solution is 1mol/L.

The preservative is potassium sorbate.

The fungicide is isothiazolinone.

A preparation method of vegetable oil-based nano lubricating oil additive, comprising the following steps:

(1) Preparation of repairing nanoparticles: Graphene oxide is uniformly dispersed in absolute ethanol solution according to the mass volume ratio of 1g: 50ml, and a copper chloride solution with a concentration of 1% of the mixed solution mass is added under continuous stirring and is 1mol/L, and then Add 0.1% 1-octadecene to the mixed liquid, put it into a high-pressure homogenizer, cycle it 5 times under the condition of 20MPa, and dry the product in a vacuum oven at 50°C for 24 hours to obtain repaired nanoparticles;

(2) Preparation of ultra-fine boron nitride: Soak boron nitride powder in sodium hydroxide solution, heat to boiling, and keep boiling for 30 minutes, then add γ-aminopropyltriethoxy with 0.1% of the mass of the mixed solution Silane was dried after stirring for 30 minutes, and the dried solid powder was added to a planetary ball mill at a speed of 200 rpm, and ball milled for 24 hours to obtain ultrafine boron nitride;

(3) Heating the base oil to 80°C, adding surfactants, repairing nanoparticles, ultrafine boron nitride, preservatives, and fungicides sequentially under stirring, and continuing to stir at a constant temperature for 12 hours, then cooling down naturally to obtain the Vegetable oil-based nano lubricating oil additive.

All raw materials in this example are commercially available. The additives in this example are used as lubricating oil admixtures, and can be added to commercially available lubricating oils. The dosage is 0.1-0.5% of the mass of the lubricating oil.

Example 2

A vegetable oil-based nano-lubricating oil additive, prepared from the following raw materials in parts by weight: 15 parts of base oil, 2 parts of surfactant, 2 parts of repairing nanoparticles, 1 part of ultrafine boron nitride, 0.3 parts of preservative, bactericidal 0.3 parts.

Described base oil is peanut oil.

The surfactant is polyoxyethylene polyoxypropylene pentaerythritol ether.

The preparation method of the repaired nanoparticles is as follows: disperse the graphene oxide evenly in the absolute ethanol solution according to the mass volume ratio of 2g: 50ml, and add a copper chloride solution with a concentration of 1mol/L of 2% of the mass of the mixed solution under continuous stirring , and then add 0.2% 1-octadecene to the mixed solution, then put it into a high-pressure homogenizer, cycle it for 5 times under the condition of 20MPa, and dry the product in a vacuum oven at 70°C for 24 hours to obtain repaired nanoparticles.

The preparation method of the ultrafine boron nitride is as follows: soak boron nitride powder in sodium hydroxide solution, heat to boiling, and keep boiling for 30 minutes, then add γ-aminopropyltriethyl Oxysilane was dried after stirring continuously for 30 minutes, and the dried solid powder was added to a planetary ball mill at a speed of 200 rpm, and ball milled for 24 hours to obtain ultrafine boron nitride.

The amount ratio of the boron nitride and the sodium hydroxide solution is 10g:50mL, and the concentration of the sodium hydroxide solution is 1mol/L.

The preservative is potassium sorbate.

The fungicide is isothiazolinone.

A preparation method of vegetable oil-based nano lubricating oil additive, comprising the following steps:

(1) Preparation of repairing nanoparticles: Graphene oxide is uniformly dispersed in absolute ethanol solution according to the mass volume ratio of 2g: 50ml, and a copper chloride solution with a concentration of 2% of the mass of the mixed solution is added to be 1mol/L under continuous stirring, and then Add 0.2% 1-octadecene to the mixed solution, put it into a high-pressure homogenizer, cycle it 5 times under the condition of 20MPa, and dry the product in a vacuum oven at 70°C for 24 hours to obtain repaired nanoparticles;

(2) Preparation of ultra-fine boron nitride: Soak boron nitride powder in sodium hydroxide solution, heat to boiling, and keep boiling for 30 minutes, then add γ-aminopropyltriethoxy with 0.1% of the mass of the mixed solution Silane was dried after stirring for 30 minutes, and the dried solid powder was added to a planetary ball mill at a speed of 200 rpm, and ball milled for 24 hours to obtain ultrafine boron nitride;

(3) Heat the base oil to 80-90°C, add surfactants, repairing nanoparticles, ultrafine boron nitride, preservatives, and fungicides in sequence under stirring, keep stirring at constant temperature for 12 hours, and then cool down naturally to obtain The vegetable oil-based nano lubricating oil additive.

All raw materials in this example are commercially available. The additives in this example are used as lubricating oil admixtures, and can be added to commercially available lubricating oils. The dosage is 0.1-0.5% of the mass of the lubricating oil.

Example 3

A vegetable oil-based nano lubricating oil additive, prepared from the following raw materials in parts by weight: 17 parts of base oil, 2 parts of surfactant, 2 parts of repairing nanoparticles, 1.1 parts of ultrafine boron nitride, 0.4 parts of preservative, bactericidal 0.4 parts of the agent.

The base oil is soybean oil.

The surfactant is polyoxyethylene polyoxypropylene pentaerythritol ether.

The preparation method of the repaired nanoparticles is: uniformly disperse graphene oxide in absolute ethanol solution according to the mass volume ratio of 3g:50ml, and add copper chloride solution with a concentration of 1mol/L of 3% of the mixed solution mass under continuous stirring , and then add 0.3% 1-octadecene to the mixed liquid, then put it into a high-pressure homogenizer, cycle 10 times under the condition of 30MPa, and dry the product in a vacuum oven at 70°C for 48h to obtain repaired nanoparticles.

The preparation method of the ultrafine boron nitride is as follows: soak boron nitride powder in sodium hydroxide solution, heat to boiling, and keep boiling for 60 minutes, then add γ-aminopropyltriethyl Oxysilane was dried after continuous stirring for 60 minutes, and the dried solid powder was added to a planetary ball mill at a speed of 300 rpm, and ball milled for 48 hours to obtain ultrafine boron nitride.

The amount ratio of the boron nitride and the sodium hydroxide solution is 10g:50mL, and the concentration of the sodium hydroxide solution is 1mol/L.

The preservative is potassium sorbate.

The fungicide is isothiazolinone.

A preparation method of vegetable oil-based nano lubricating oil additive, comprising the following steps:

(1) Preparation of repairing nanoparticles: Graphene oxide is uniformly dispersed in absolute ethanol solution according to the mass volume ratio of 3g: 50ml, and the concentration of 3% of the mixed solution mass is added under continuous stirring to be a copper chloride solution of 1mol/L, and then Add 1-octadecene with 0.3% mass of the mixed solution, then put it into a high-pressure homogenizer, cycle it 10 times under the condition of 30MPa, and dry the product in a vacuum oven at 70°C for 48 hours to obtain repaired nanoparticles;

(2) Preparation of ultra-fine boron nitride: Soak boron nitride powder in sodium hydroxide solution, heat to boiling, and keep boiling for 60 minutes, then add γ-aminopropyltriethoxy with 0.3% of the mixed liquid quality Silane was dried after stirring for 60 minutes, and the dried solid powder was added to a planetary ball mill at a speed of 300 rpm, and ball milled for 48 hours to obtain ultrafine boron nitride;

(3) Heat the base oil to 80-90°C, add surfactants, repair nanoparticles, ultrafine boron nitride, preservatives, and fungicides in sequence under stirring, keep stirring at constant temperature for 24 hours, and then cool down naturally to obtain The vegetable oil-based nano lubricating oil additive.

All raw materials in this example are commercially available. The additives in this example are used as lubricating oil admixtures, and can be added to commercially available lubricating oils. The dosage is 0.1-0.5% of the mass of the lubricating oil.

Example 4

A vegetable oil-based nano-lubricating oil additive, prepared from the following raw materials in parts by weight: 20 parts of base oil, 3 parts of surfactant, 3 parts of repairing nanoparticles, 1.5 parts of ultrafine boron nitride, 0.5 parts of preservative, bactericidal 0.5 parts of the agent.

The base oil is corn oil.

The surfactant is Tween 60.

The preparation method of the repaired nanoparticles is: uniformly disperse graphene oxide in absolute ethanol solution according to the mass volume ratio of 5g:50ml, and add a copper chloride solution with a concentration of 5% of the mixed solution mass and a concentration of 1mol/L under continuous stirring , and then add 0.5% 1-octadecene to the mixed solution, then put it into a high-pressure homogenizer, cycle 10 times under the condition of 30MPa, and dry the product in a vacuum oven at 70°C for 48h to obtain repaired nanoparticles.

The preparation method of the ultrafine boron nitride is as follows: soak boron nitride powder in sodium hydroxide solution, heat to boiling, and keep boiling for 60 minutes, then add γ-aminopropyltriethyl Oxysilane was dried after continuous stirring for 60 minutes, and the dried solid powder was added to a planetary ball mill at a speed of 300 rpm, and ball milled for 48 hours to obtain ultrafine boron nitride.

The amount ratio of the boron nitride and the sodium hydroxide solution is 10g:50mL, and the concentration of the sodium hydroxide solution is 1mol/L.

The preservative is potassium sorbate.

The fungicide is isothiazolinone.

A preparation method of vegetable oil-based nano lubricating oil additive, comprising the following steps:

(1) Preparation of repairing nanoparticles: Graphene oxide is uniformly dispersed in absolute ethanol solution according to the mass volume ratio of 5g: 50ml, and the concentration of 5% of the mixed solution mass is added under continuous stirring to be a copper chloride solution of 1mol/L, and then Add 0.5% 1-octadecene to the mixed solution, put it into a high-pressure homogenizer, cycle it 10 times under the condition of 30MPa, and dry the product in a vacuum oven at 70°C for 48 hours to obtain repaired nanoparticles;

(2) Preparation of ultra-fine boron nitride: Soak boron nitride powder in sodium hydroxide solution, heat to boiling, and keep boiling for 60 minutes, then add γ-aminopropyltriethoxy with 0.3% of the mixed liquid quality Silane was dried after stirring for 60 minutes, and the dried solid powder was added to a planetary ball mill at a speed of 300 rpm, and ball milled for 48 hours to obtain ultrafine boron nitride;

(3) Heat the base oil to 80-90°C, add surfactants, repair nanoparticles, ultrafine boron nitride, preservatives, and fungicides in sequence under stirring, keep stirring at constant temperature for 24 hours, and then cool down naturally to obtain The vegetable oil-based nano lubricating oil additive.

All raw materials in this example are commercially available. The additives in this example are used as lubricating oil admixtures, and can be added to commercially available lubricating oils. The dosage is 0.1-0.5% of the mass of the lubricating oil.

Comparative example 1

A vegetable oil-based nano-lubricating oil additive, prepared from the following raw materials in parts by weight: 20 parts of base oil, 3 parts of surfactant, 3 parts of repairing nanoparticles, 1.5 parts of ultrafine boron nitride, 0.5 parts of preservative, bactericidal 0.5 parts of the agent.

The base oil is corn oil.

The surfactant is Tween 60.

The repairing nanoparticles are graphene oxide.

The preparation method of the ultrafine boron nitride is as follows: soak boron nitride powder in sodium hydroxide solution, heat to boiling, and keep boiling for 60 minutes, then add γ-aminopropyltriethyl Oxysilane was dried after continuous stirring for 60 minutes, and the dried solid powder was added to a planetary ball mill at a speed of 300 rpm, and ball milled for 48 hours to obtain ultrafine boron nitride.

The amount ratio of the boron nitride and the sodium hydroxide solution is 10g:50mL, and the concentration of the sodium hydroxide solution is 1mol/L.

The preservative is potassium sorbate.

The fungicide is isothiazolinone.

A preparation method of vegetable oil-based nano lubricating oil additive, comprising the following steps:

(1) Preparation of ultra-fine boron nitride: soak boron nitride powder in sodium hydroxide solution, heat to boiling, and keep boiling for 60 minutes, then add γ-aminopropyl triethoxy with 0.3% of the mixed liquid quality Silane was dried after stirring for 60 minutes, and the dried solid powder was added to a planetary ball mill at a speed of 300 rpm, and ball milled for 48 hours to obtain ultrafine boron nitride;

(2) Heat the base oil to 80-90°C, add surfactants, repair nanoparticles, ultrafine boron nitride, preservatives, and fungicides in sequence under stirring, keep stirring at constant temperature for 24 hours, and then cool down naturally to obtain The vegetable oil-based nano lubricating oil additive.

In this comparative example, except that the repaired nanoparticles are replaced by graphene oxide, the rest of the raw materials and preparation methods are the same as in Example 4.

Comparative example 2

A vegetable oil-based nano-lubricating oil additive, which is prepared from the following raw materials in parts by weight: 20 parts of base oil, 3 parts of surfactant, 3 parts of repairing nanoparticles, 1.5 parts of boron nitride, 0.5 parts of preservative, and 0.5 parts of bactericide share.

The base oil is corn oil.

The surfactant is Tween 60.

The preparation method of the repaired nanoparticles is: uniformly disperse graphene oxide in absolute ethanol solution according to the mass volume ratio of 5g:50ml, and add a copper chloride solution with a concentration of 5% of the mixed solution mass and a concentration of 1mol/L under continuous stirring , and then add 0.5% 1-octadecene to the mixed solution, then put it into a high-pressure homogenizer, cycle 10 times under the condition of 30MPa, and dry the product in a vacuum oven at 70°C for 48h to obtain repaired nanoparticles.

The preservative is potassium sorbate.

The fungicide is isothiazolinone.

A preparation method of vegetable oil-based nano lubricating oil additive, comprising the following steps:

(1) Preparation of repairing nanoparticles: Graphene oxide is uniformly dispersed in absolute ethanol solution according to the mass volume ratio of 5g: 50ml, and the concentration of 5% of the mixed solution mass is added under continuous stirring to be a copper chloride solution of 1mol/L, and then Add 0.5% 1-octadecene to the mixed solution, put it into a high-pressure homogenizer, cycle it 10 times under the condition of 30MPa, and dry the product in a vacuum oven at 70°C for 48 hours to obtain repaired nanoparticles;

(2) Heat the base oil to 80-90°C, add surfactants, repair nanoparticles, ultrafine boron nitride, preservatives, and fungicides in sequence under stirring, keep stirring at constant temperature for 24 hours, and then cool down naturally to obtain The vegetable oil-based nano lubricating oil additive.

In this comparative example, the rest of the raw materials and preparation methods are the same as those in Example 4, except that the ultrafine boron nitride is replaced by commercially available common boron nitride.

Comparative example 3

A vegetable oil-based nano-lubricating oil additive, which is prepared from the following raw materials in parts by weight: 20 parts of base oil, 3 parts of surfactant, 3 parts of repairing nanoparticles, 1.5 parts of boron nitride, 0.5 parts of preservative, and 0.5 parts of bactericide share.

The base oil is corn oil.

The surfactant is Tween 60.

The repairing nanoparticles are graphene oxide.

The preservative is potassium sorbate.

The fungicide is isothiazolinone.

A preparation method of vegetable oil-based nano lubricating oil additive, comprising the following steps:

(1) Heat the base oil to 80-90°C, add surfactants, repairing nanoparticles, ultrafine boron nitride, preservatives, and fungicides in sequence under stirring, keep stirring at constant temperature for 24 hours, and then cool down naturally to obtain The vegetable oil-based nano lubricating oil additive.

In this comparative example, the rest of the raw materials and preparation methods are the same as in Example 4, except that the ultrafine boron nitride is replaced by commercially available common boron nitride, and the repaired nanoparticles are replaced by graphene oxide.

Performance Testing

The saturated polyol ester 3970 produced by Croda Co., Ltd. is used as the base oil, and the lubricating oil additives obtained in Examples 1-4 of the present invention and comparative examples 1-3 are added according to the base oil quality 0.1%, and the gained lubricating oil is subjected to a performance test:

The thermal stability is tested according to SH/T0680-1999, the oxidation stability is measured according to SH/T0193-2008, the kinematic viscosity is measured according to GB/T11137-1989, the viscosity index is measured according to NFT60-136-2004, and the biodegradability is measured according to CEC L-33 - Determination of A-93, according to GB/T3142-1982 (2004) "Lubricant Bearing Capacity Test Method (Four-Ball Method)" to measure the wear resistance of lubricating oil.

Dispersion: After standing for 72 hours, observe the shape of lubricating oil. Then they were ultrasonicated for 4 hours, centrifuged at 2000r/min for 30 minutes, and then left to stand for 72 hours. The shape of the lubricating oil was observed again, and the experimental results were recorded.

Table 1 performance test results

From the data in the table, we can see that the lubricating oil obtained in the examples of the present invention exhibits better stability and lubricating and anti-wear performance, but lacks the comparative example 1 of repairing nanoparticles and the comparative example of lacking ultrafine boron nitride 2 and Comparative Example 3 in which both are changed, the synergistic effect between the raw materials disappears or weakens, and its various properties show a decline in varying degrees, which is due to the lack of graphene and boron nitride with corresponding modification means , its dispersibility decreases, uniform dispersion cannot be achieved, and the synergistic effect disappears, which directly leads to the decline of anti-wear performance.

It can also be seen from the topography of wear scars in Figure 1 that the comparative examples all present parallel furrows with obvious scratches, while in Example 4 of the present invention, the overall smoothness of the wear scars is the best, and the wear scars are finer and shallower. Uniform, no obvious furrows. This shows that the lubricating oil obtained from the lubricating oil additive in the embodiment of the present invention has a small friction coefficient of the steel ball, which plays a good role in repairing the surface and improves the anti-wear performance of the oil sample.

It should be noted that the above-mentioned embodiments are only some of the preferred modes for implementing the present invention, but not all of them. Obviously, based on the above-mentioned embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

Claims (7)

1. A vegetable oil-based nano-lubricating oil additive is characterized in that it is prepared from the following raw materials by weight: 10-20 parts of base oil, 1-3 parts of surfactant, 1-3 parts of repairing nanoparticles, superfine 0.5-1.5 parts of boron nitride, 0.1-0.5 parts of preservatives, 0.3-0.5 parts of fungicides; The preparation method of the repaired nanoparticles is as follows: uniformly disperse graphene oxide in the absolute ethanol solution according to the mass volume ratio of 1-5g:50ml, and add 1-5% of the mass of the mixed solution under continuous stirring with a concentration of 1mol/L Copper chloride solution, then add 1-octadecene with a mass of 0.1-0.5% of the mixed solution, then put it into a high-pressure homogenizer, circulate it for 5-10 times under the condition of 20-30MPa, and put the product in a vacuum oven at 50-70°C Dry in medium for 24-48h to obtain repaired nanoparticles; The preparation method of the ultra-fine boron nitride is as follows: soak boron nitride powder in sodium hydroxide solution, heat to boiling, and keep boiling for 30-60 minutes, then add γ-ammonia with a mass of 0.1-0.3% of the mixed solution Propyltriethoxysilane, keep stirring for 30-60min and then dry, add the dried solid powder into a planetary ball mill, the speed of the ball mill is 200-300 rpm, and ball mill for 24-48h to obtain ultrafine nitriding boron. 2. The vegetable oil-based nano lubricating oil additive according to claim 1, wherein the base oil is one or more of corn oil, peanut oil or soybean oil. 3. The vegetable oil-based nano lubricating oil additive according to claim 1, wherein the surfactant is Tween 60 or polyoxyethylene polyoxypropylene pentaerythritol ether. 4. according to the described vegetable oil-based nano lubricating oil additive of claim 1, it is characterized in that, the consumption ratio of described boron nitride and sodium hydroxide solution is 10g:50mL, and the concentration of sodium hydroxide solution is 1mol/L. 5. vegetable oil-based nano lubricating oil additive according to claim 1, is characterized in that, described preservative is potassium sorbate. 6. The vegetable oil-based nano lubricating oil additive according to claim 1, wherein the bactericide is an isothiazolinone. 7. a preparation method of the vegetable oil-based nano-lubricating oil additive described in any one of claims 1-6, is characterized in that, comprises the following steps: (1) Preparation of repairing nanoparticles: disperse graphene oxide evenly in anhydrous ethanol solution according to the mass volume ratio of 1-5g: 50ml, and add 1-5% of the mass of the mixed solution under constant stirring. Copper solution, then add 1-octadecene with a mass of 0.1-0.5% of the mixed solution, then put it into a high-pressure homogenizer, circulate it for 5-10 times under the condition of 20-30MPa, and dry the product in a vacuum oven at 50-70°C Dry for 24-48 hours to get repaired nanoparticles; (2) Preparation of ultra-fine boron nitride: Soak boron nitride powder in sodium hydroxide solution, heat to boiling, and keep boiling for 30-60 minutes, then add γ-aminopropyl with a mass of 0.1-0.3% of the mixed solution Triethoxysilane, continuously stirred for 30-60 minutes, then dried, added the dried solid powder into a planetary ball mill, the speed of the ball mill was 200-300 rpm, and ball milled for 24-48 hours to obtain ultrafine boron nitride; (3) Heat the base oil to 80-90°C, add surfactants, repairing nanoparticles, ultra-fine boron nitride, preservatives, and fungicides in sequence under stirring, keep stirring at constant temperature for 12-24 hours, and then cool down naturally , to obtain the vegetable oil-based nano lubricating oil additive.

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