CN117448064B

CN117448064B - Conductive lubricant

Info

Publication number: CN117448064B
Application number: CN202311196440.4A
Authority: CN
Inventors: 陈倩倩; 冯涛; 罗冲; 袁志斌; 张伟; 张东东; 杨欢
Original assignee: Gansu Hailiang New Energy Materials Co ltd
Current assignee: Gansu Hailiang New Energy Materials Co ltd
Priority date: 2023-09-15
Filing date: 2023-09-15
Publication date: 2026-01-27
Anticipated expiration: 2043-09-15
Also published as: CN117448064A

Abstract

The present invention relates to a conductive lubricant. The conductive lubricant at least comprises base oil, an antioxidant, an antiwear agent and a viscosity modifier, wherein the conductive lubricant contains conductive metal ions, the antioxidant at least comprises thiocarbamate, the antiwear agent at least comprises borate compounds, the mass fraction of the base oil in the conductive lubricant is more than or equal to 90%, the mass fractions of the antioxidant and the antiwear agent in the conductive lubricant are both less than 5%, and the mass fraction of the viscosity modifier in the conductive lubricant is less than 2%. The conductive lubricant provided by the invention has excellent wear resistance, volatility resistance and heat dissipation.

Description

Conductive lubricant

Technical Field

The invention relates to the technical field of lubricants, in particular to a conductive lubricant.

Background

With the rapid development of modern industry, higher requirements are being placed on the performance of lubricants, for example, conductive lubricants used for both lubrication and wear resistance between metals and for achieving electron transport between metals are increasingly required. However, the current research on the conductive lubricant is relatively less, and the conductive lubricant is generally a mixture composed of base oil, conductive agent, antiwear agent, antioxidant and other additives, so that the conductive lubricant has low wear resistance, and meanwhile has the problems of high volatility and slow heat dissipation, and the conductive lubricant has short service life due to the fact that the heat dissipation is slow and serious heat generation among parts can be caused, and volatilization of the conductive lubricant is accelerated again to form vicious circle.

Disclosure of Invention

Based on this, it is necessary to provide a conductive lubricant having excellent wear resistance, volatility resistance and heat dissipation properties, in view of the above-described problems.

An electrically conductive lubricant at least comprising a base oil, an antioxidant, an antiwear agent and a viscosity modifier, wherein the electrically conductive lubricant contains electrically conductive metal ions, the antioxidant at least comprises thiocarbamate, the antiwear agent at least comprises borate compounds, the mass fraction of the base oil in the electrically conductive lubricant is greater than or equal to 90%, the mass fractions of the antioxidant and the antiwear agent in the electrically conductive lubricant are both less than 5%, and the mass fraction of the viscosity modifier in the electrically conductive lubricant is less than 2%.

In one embodiment, the base oil is present in the electrically conductive lubricant in an amount of 98% or greater and the antioxidant, antiwear agent, and viscosity modifier are all present in the electrically conductive lubricant in an amount of less than 1% by weight.

In one embodiment, the thiocarbamate is selected from the group consisting of dialkyldithiocarbamates;

and/or the borate compound is at least one selected from HFT-289 borate, triethanolamine borate, triisopropanol ammonia ring borate, bis-catechol borate, bis (2-methyl-2, 4-pentanediol) borate and bis (2, 4-dimethyl-2, 4-pentanediol) borate;

And/or the viscosity modifier is at least one selected from ethylene-propylene copolymer, polyisobutylene, styrene-butadiene copolymer and polymethacrylate.

In one embodiment, the thiocarbamate is selected from at least one of a molybdenum salt, a zinc salt, an antimony salt, or a lead salt.

In one embodiment, the conductive lubricant further comprises a rust inhibitor, wherein the mass fraction of the rust inhibitor in the conductive lubricant is less than 1%.

In one embodiment, the rust inhibitor is selected from at least one of alkaline earth element-containing fatty acid salts, alkaline earth element-containing naphthenate salts, lead naphthenate, zinc naphthenate, sodium petroleum sulfonate, barium petroleum sulfonate, calcium petroleum sulfonate, trioleate diamine, rosin amine, sorbitan monooleate, polyethylene glycol dioleate, polyethylene glycol distearate, oleoyl sarcosine, oleoyl sarcosinamine salts, amidimidazolines, benzotriazoles, alkyl phosphate.

In one embodiment, the antioxidant further comprises at least one of N-phenyl-a naphthylamine, alkylated diphenylamine, 2, 6-di-tert-butyl-p-cresol, 4-methylenebis (2, 6-di-tert-butylphenol), benzotriazole aldehyde-amine condensate, thiadiazole derivative-containing complexing agent;

and/or the antiwear agent further comprises at least one of sulfur compounds, phosphorus compounds and sulfur-phosphorus compounds.

In one embodiment, the thiocarbamate comprises more than 50% of the antioxidant by mass fraction;

And/or, the borate compound accounts for more than 50% of the antiwear agent in mass fraction.

In one embodiment, the conductive lubricant comprises, by mass, 98% or more of base oil, 0.1% -0.7% of thiocarbamate, 0.1% -0.5% of borate compound, 0.01% -0.5% of viscosity modifier and 0.3% or less of rust inhibitor.

In one embodiment, the mass ratio of the thiocarbamate to the borate compound is 1:1.1-1:5.

In one embodiment, the borate compound is selected from at least two of HFT-289 borate, triethanolamine borate, triisopropanol ammonia ring borate, bis-catechol borate, bis (2-methyl-2, 4-pentanediol) borate, bis (2, 4-dimethyl-2, 4-pentanediol) borate.

In the conductive lubricant, the thiocarbamate and the borate compound are selected, so that the conductive lubricant has good extreme pressure wear resistance, meanwhile, the nitrogen atom in the thiocarbamate and the boron atom in the borate compound can also form a lamellar compound, the layers can slide more easily, and the wear resistance is further improved while the lubricity is enhanced. In addition, more hydrogen bond donors and hydrogen bond acceptors exist between the thiocarbamate and the borate compound, and the nitrogen atom in the thiocarbamate and the boron atom in the borate compound can realize intermolecular bonding, so that the intermolecular acting force is synergistically enhanced, and the volatility of the conductive lubricant can be effectively reduced by matching with the action of the viscosity modifier; in addition, the conductive lubricant has good antiwear effect, does not generate excessive friction heat in the running process of metal parts, has higher heat conductivity of each component, has good heat dissipation performance, and basically does not aggravate the volatility of the conductive lubricant, so the service life of the conductive lubricant is long.

Detailed Description

The present invention will be described in more detail below in order to facilitate understanding of the present invention. It should be understood, however, that the invention may be embodied in many different forms and should not be limited to the implementations or embodiments described herein. Rather, these embodiments or examples are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments or examples only and is not intended to be limiting of the invention.

The conductive lubricant provided by the invention is mainly used for protecting mechanical equipment and the like, such as copper foil production equipment and the like, and at least comprises base oil, an antioxidant, an antiwear agent and a viscosity improver, wherein the conductive lubricant contains conductive metal ions, the antioxidant at least comprises thiocarbamate, the antiwear agent at least comprises boric acid ester compounds, the mass fraction of the base oil in the conductive lubricant is greater than or equal to 90%, the mass fractions of the antioxidant and the antiwear agent in the conductive lubricant are both less than 5%, and the mass fraction of the viscosity improver in the conductive lubricant is less than 2%.

The conductive lubricant of the invention has the advantages of high vulcanization speed and low vulcanization temperature of thiocarbamate, can quickly form metal sulfide with metal to improve wear resistance, meanwhile, sulfur atoms and nitrogen atoms of thiocarbamate also have uncoordinated electrons, can form a protective film with the metal surface during mechanical operation to prevent further increase of wear amount, and can form a complex boundary lubricating film containing organic nitrogen, organic sulfur, sulfate, sulfide and other components when undergoing tribochemical reaction with the metal surface, and the complex boundary lubricating film has excellent extreme pressure wear resistance. Therefore, the use of thiocarbamates in the conductive lubricant can effectively enhance the antiwear properties, and at the same time, the protective film formed and the reducing properties possessed by itself due to the fact that the sulfur atom and the nitrogen atom have non-coordinated electrons can further prevent oxidation of the metal.

The borate compound has good antiwear performance as an antiwear agent. Furthermore, the nitrogen atom in the thiocarbamate and the boron atom in the borate compound can also form a lamellar compound, so that the antiwear performance is further improved.

In addition, more hydrogen bond donors and hydrogen bond acceptors exist between the thiocarbamate and the borate compound, and the nitrogen atom in the thiocarbamate and the boron atom in the borate compound can realize intermolecular bonding, so that the intermolecular acting force is synergistically enhanced, and the volatility of the conductive lubricant can be effectively reduced by matching with the action of the viscosity modifier. In addition, the conductive lubricant has good antiwear effect, does not generate excessive friction heat in the running process of metal parts, has higher heat conductivity of each component, has good heat dissipation, and basically does not aggravate the volatility of the conductive lubricant.

Therefore, the conductive lubricant has excellent wear resistance and volatility resistance and long service life.

Optionally, the mass fraction of the base oil in the conductive lubricant is greater than or equal to 95%, the mass fraction of the antioxidant, the antiwear agent and the viscosity modifier in the conductive lubricant is less than 2%, preferably, the mass fraction of the base oil in the conductive lubricant is greater than or equal to 98%, and the mass fraction of the antioxidant, the antiwear agent and the viscosity modifier in the conductive lubricant is less than 1%. The invention can reduce the content of the antioxidant, the antiwear agent and the viscosity modifier by increasing the content of the base oil, and can reduce the cost of the conductive lubricant while maintaining the excellent antiwear performance, volatility resistance and heat dissipation of the conductive lubricant.

In an embodiment, the base oil of the conductive lubricant provided by the present invention may be at least one selected from mineral base oil, synthetic base oil or biological base oil, preferably mineral base oil or synthetic base oil.

In one embodiment, the thiocarbamate is selected from the group consisting of dialkyldithiocarbamates, optionally, the dialkyldithiocarbamate salt selected from dibutyl dithiocarbamate at least one of dipentyl dithiocarbamic acid salt and dibenzyl dithiocarbamic acid salt.

In an embodiment, the thiocarbamate is at least one of molybdenum salt, zinc salt, antimony salt or lead salt, and the conductive lubricant can be provided with metal conductive ions by at least one of molybdenum salt, zinc salt, antimony salt or lead salt, so that the conductive lubricant has conductive performance. Preferably, the thiocarbamate in the present invention is selected from zinc salts, such as zinc dialkyldithiocarbamates, and specifically, may be selected from at least one of zinc dibutyldithiocarbamate and zinc dipentyldithiocarbamate.

In one embodiment, the borate compound is selected from at least one of HFT-289 borate, triethanolamine borate, triisopropanol ammonia cyclic borate, bis-catechol borate, bis (2-methyl-2, 4-pentanediol) borate, bis (2, 4-dimethyl-2, 4-pentanediol) borate.

In one embodiment, the viscosity modifier is at least one selected from ethylene-propylene copolymer, polyisobutylene, styrene-butadiene copolymer and polymethacrylate, and has excellent atmospheric aging resistance, chemical corrosion resistance and high temperature resistance, and simultaneously is also excellent dispersing agent and dehydrating agent, so that the quality of the conductive lubricant can be ensured, and the service life of the conductive lubricant can be prolonged. Preferably, the viscosity modifier of the present invention is selected from ethylene propylene copolymers.

Because the antirust agent has strong brine soaking resistance and good oil solubility, the antirust agent can be used as a cosolvent of other components in base oil, is favorable for full diffusion, and integrally improves the comprehensive performance of the conductive lubricant, in one embodiment, the conductive lubricant further comprises the antirust agent, and the mass fraction of the antirust agent in the conductive lubricant is less than 1%.

In one embodiment, the rust inhibitor is selected from at least one of fatty acid salts containing alkaline earth metal elements, naphthenate salts containing alkaline earth metal elements, lead naphthenate, zinc naphthenate, sodium petroleum sulfonate, barium petroleum sulfonate, calcium petroleum sulfonate, trioleate diamine, rosin amine, sorbitan monooleate, polyethylene glycol dioleate, polyethylene glycol distearate, oleoyl sarcosine, oleoyl sarcosinamine salt, amide imidazoline, benzotriazole, and alkyl phosphate, preferably at least one of sodium petroleum oleate, barium petroleum sulfonate and calcium petroleum sulfonate, which is low in cost and environment-friendly, and can provide conductive metal ions to improve the conductivity of the conductive lubricant.

In one embodiment, the antioxidant further comprises at least one of N-phenyl-a naphthylamine, alkylated diphenylamine, 2, 6-di-tert-butyl-p-cresol, 4-methylenebis (2, 6-di-tert-butylphenol), benzotriazole aldehyde-amine condensate, thiadiazole derivative-containing complexing agent.

When the antioxidant is a mixture of thiocarbamate and other antioxidants, the thiocarbamate accounts for more than 50% of the antioxidant by mass, preferably, the thiocarbamate accounts for more than 60%, more than 70%, more than 80%, more than 90% or more than 95% of the antioxidant.

In one embodiment, the antiwear agent further includes at least one of sulfur compounds, phosphorus compounds, and sulfur phosphorus compounds. Specifically, the sulfur compound can be selected from at least one of sulfurized fatty acid ester and sulfurized isobutylene, the phosphorus compound can be selected from at least one of tri (xylene) phosphate and isopropylated triphenyl phosphate, and the sulfur phosphorus compound can be selected from at least one of triphenyl thiophosphate, sulfur phosphorus-containing nitrogen derivatives and dialkyl zinc dithiophosphate.

When the antiwear agent is a mixture of a borate compound and other antiwear agents, the borate compound accounts for more than 50% of the antiwear agent, preferably more than 60%, more than 70%, more than 80%, more than 90% or more than 95% of the antiwear agent in mass fraction.

Alternatively, four embodiments can be distinguished, depending on the different combinations of antioxidants and antiwear agents:

the first conductive lubricant, the antioxidant is thiocarbamate, and the antiwear agent is borate compound;

the second conductive lubricant is a combination of thiocarbamate and other antioxidants, and the antiwear agent is a borate compound;

the third conductive lubricant, the antioxidant is thiocarbamate, and the antiwear agent is the combination of borate compound and other antiwear agents;

and the fourth conductive lubricant is a combination of thiocarbamate and other antioxidants, and the antiwear agent is a combination of a borate compound and other antiwear agents.

In one embodiment, the conductive lubricant comprises, by mass, 98% or more of base oil, 0.1% to 0.7% of thiocarbamate, 0.1% to 0.5% of borate compound, 0.01% to 0.5% of viscosity improver and 0.3% or less of rust inhibitor.

Therefore, the components and the content in the conductive lubricant are reasonably selected, so that the wear resistance, volatility resistance, oxidation resistance and heat dissipation of the conductive lubricant can be further ensured, and meanwhile, the conductive lubricant is low in cost and environment-friendly.

In one embodiment, the mass ratio of the thiocarbamate to the borate compound is controlled within the range of 1:1.1-1:5, so that the synergistic effect of the thiocarbamate and the borate compound can be better improved, and the wear resistance, the volatility resistance and the oxidation resistance of the conductive lubricant are improved. Optionally, the mass ratio of the thiocarbamate to the borate compound is selected from any ratio or a range of values between any ratio of 1:1.1, 1:2, 1:3, 1:4, 1:5.

In one embodiment, the borate compound is selected from at least two of HFT-289 borate, triethanolamine borate, triisopropanol ammonia cyclic borate, bis-catechol borate, bis (2-methyl-2, 4-pentanediol) borate, bis (2, 4-dimethyl-2, 4-pentanediol) borate, and is more useful for improving the antiwear, anti-volatility, and heat dissipation properties of the conductive lubricant, preferably a composition comprising at least HFT-289 borate and/or triethanolamine borate.

Hereinafter, the conductive lubricant will be further described by the following specific examples.

Example 1

The conductive lubricant of this example comprises, in mass fraction, 99.44% of mineral base oil, 0.2% of zinc dibutyldithiocarbamate, 0.2% of HFT-289 borate, 0.1% of triethanolamine borate, 0.01% of ethylene-propylene copolymer, and 0.05% of sodium petroleum sulfonate.

Example 2

The conductive lubricating oil of this example comprises, in mass fraction, 99.44% of mineral base oil, 0.2% of zinc dibutyldithiocarbamate, 0.1% of triisopropanol aminocycloborate, 0.2% of biscatechol borate, 0.01% of ethylene-propylene copolymer and 0.05% of sodium petroleum sulfonate.

Example 3

The conductive lubricant of this example comprises, in mass fraction, 99.19% of mineral base oil, 0.3% of zinc dibutyldithiocarbamate, 0.2% of HFT-289 borate, 0.25% of triethanolamine borate, 0.01% of ethylene-propylene copolymer, and 0.05% of sodium petroleum sulfonate.

Example 4

The conductive lubricant of this example comprises, in mass fraction, 99.04% of mineral base oil, 0.3% of zinc dibutyldithiocarbamate, 0.3% of HFT-289 borate, 0.3% of triethanolamine borate, 0.01% of ethylene-propylene copolymer, and 0.05% of sodium petroleum sulfonate.

Example 5

The conductive lubricant of this example comprises, in mass fraction, 98.74% of mineral base oil, 0.2% of zinc dibutyldithiocarbamate, 0.5% of HFT-289 borate, 0.5% of triethanolamine borate, 0.01% of ethylene-propylene copolymer, and 0.05% of sodium petroleum sulfonate.

Example 6

The conductive lubricating oil of this example comprises, in mass fraction, 99.19% of mineral base oil, 0.3% of zinc dibutyldithiocarbamate, 0.2% of triisopropanol aminocycloborate, 0.25% of biscatechol borate, 0.01% of ethylene-propylene copolymer and 0.05% of sodium petroleum sulfonate.

Example 7

The conductive lubricant of this example comprises, in mass fraction, 99.35% mineral base oil, 0.3% zinc dibenzyldithiocarbamate, 0.3% triethanolamine borate and 0.05% ethylene propylene copolymer.

Example 8

The conductive lubricant of this example comprises, in mass fraction, 99.34% mineral base oil, 0.3% zinc dibenzyldithiocarbamate, 0.3% HFT-289 borate, 0.01% ethylene-propylene copolymer, and 0.05% sodium petroleum sulfonate.

Example 9

The conductive lubricant of this example comprises, in mass fraction, 99.04% mineral base oil, 0.3% zinc dibenzyldithiocarbamate, 0.6% triethanolamine borate, 0.01% ethylene propylene copolymer, and 0.05% sodium petroleum sulfonate.

Example 10

The conductive lubricant of this example comprises, in mass fraction, 99.19% mineral base oil, 0.2% zinc dipentyl dithiocarbamic acid, 0.1% N-phenyl-a naphthylamine, 0.45% HFT-289 borate, 0.01% ethylene-propylene copolymer and 0.05% sodium petroleum sulfonate.

Example 11

The conductive lubricant of this example comprises, in mass fraction, 99.19% mineral base oil, 0.2% zinc dipentyl dithiocarbamate, 0.1% N-phenyl-alpha naphthylamine, 0.2% HFT-289 borate, 0.25% triethanolamine borate, 0.01% ethylene propylene copolymer, and 0.05% sodium petroleum sulfonate.

Example 12

The conductive lubricant of this example comprises, in mass fraction, 99.19% mineral base oil, 0.3% zinc dipentyl dithiocarbamate, 0.2% HFT-289 borate, 0.25% tri (xylene) phosphate, 0.01% ethylene-propylene copolymer, and 0.05% sodium petroleum sulfonate.

Example 13

The conductive lubricant of this example comprises, in mass fraction, 99.19% mineral base oil, 0.3% zinc dipentyl dithiocarbamate, 0.25% HFT-289 borate, 0.20% isopropylated triphenyl phosphate, 0.01% ethylene propylene copolymer, and 0.05% sodium petroleum sulfonate.

Example 14

The conductive lubricant of this example comprises, in mass fraction, 99.19% mineral base oil, 0.3% zinc dipentyl dithiocarbamate, 0.2% HFT-289 borate, 0.1% triethanolamine borate, 0.15% triphenyl thiophosphate, 0.01% ethylene propylene copolymer, and 0.05% sodium petroleum sulfonate.

Example 15

The conductive lubricant of this example comprises, in mass fraction, 99.19% of mineral base oil, 0.2% of zinc dipentyl dithiocarbamic acid, 0.1% of 4, 4-methylenebis (2.6-di-tert-butylphenol), 0.25% of HFT-289 borate, 0.2% of triphenyl thiophosphate, 0.01% of ethylene-propylene copolymer and 0.05% of sodium petroleum sulfonate.

Example 16

The conductive lubricant of this example comprises, in mass fraction, 99.19% mineral base oil, 0.2% zinc dipentyl dithiocarbamic acid, 0.1% 4, 4-methylenebis (2.6-di-tert-butylphenol), 0.2% HFT-289 borate, 0.1% triethanolamine borate, 0.15% triphenyl thiophosphate, 0.01% ethylene-propylene copolymer, and 0.05% sodium petroleum sulfonate.

Example 17

The conductive lubricant of this example comprises, in mass fraction, 90% of mineral base oil, 4% of zinc dibutyldithiocarbamate, 2% of HFT-289 borate, 2% of triethanolamine borate, 1.9% of ethylene-propylene copolymer and 0.1% of sodium petroleum sulfonate.

Example 18

The conductive lubricant of this example comprises, in mass fraction, 93% mineral base oil, 2% zinc dibutyldithiocarbamate, 1.5% HFT-289 borate, 1.5% triethanolamine borate, 1.9% ethylene-propylene copolymer, and 0.1% sodium petroleum sulfonate.

Example 19

The conductive lubricant of this example comprises, in mass fraction, 95.4% mineral base oil, 1.5% zinc dibutyl dithiocarbamate, 1% HFT-289 borate, 1% triethanolamine borate, 1% ethylene propylene copolymer, and 0.1% sodium petroleum sulfonate.

Comparative example 1

The conductive lubricant of this comparative example comprises, in mass fraction, 98% of mineral base oil, 1% of alkyldiphenylamine, 0.5% of zinc dibutyldithiophosphate and 0.5% of polymethacrylate.

Comparative example 2

The conductive lubricant of this comparative example comprises, in mass fraction, 98.54% of mineral base oil, 0.3% of 4, 4-methylenebis (2, 6-di-tert-butylphenol), 0.2% of triphenyl phosphorothioate, 0.2% of a nitrogen-containing derivative of the thiophosphoric type, 0.5% of zinc dialkyldithiophosphate, 0.01% of ethylene-propylene copolymer and 0.05% of sodium petroleum sulfonate.

Comparative example 3

This comparative example differs from example 1 in that zinc dibutyldithiocarbamate was replaced with a benzotriazole aldehyde-amine condensate and a thiadiazole derivative-containing complex, wherein the benzotriazole aldehyde-amine condensate was 0.1% by mass of the conductive lubricant, and the thiadiazole derivative-containing complex was 0.1% by mass of the conductive lubricant.

Comparative example 4

This comparative example differs from example 1 in that HFT-289 borate and triethanolamine borate were replaced with tri (xylene) phosphate and isopropylated triphenyl phosphate, wherein tri (xylene) phosphate represents 0.2% of the conductive lubricant mass and isopropylated triphenyl phosphate represents 0.1% of the conductive lubricant mass.

Comparative example 5

The lubricant of this comparative example comprises, in mass fraction, 31% of 150N (three types of oils), 31% of PA06 synthetic base oil, 16% of bisquaternary tetraol, 1.9% of lithium hydroxide monohydrate, 2.5% of stearic acid, 10% of dodecahydroxystearic acid, 1.6% of fumed silica, 1.6% of molybdenum dibutyldithiocarbamate, 1.3% of triphenyl thiophosphate, 0.8% of HFT-289 borate, 1.2% of Xin Dingji diphenylamine, and 1.2% of 4, 4-methylenebis (2, 6-di-tert-butylphenol).

Comparative example 6

This comparative example differs from example 1 in that HFT-289 borate and triethanolamine borate are replaced with nitrogen borate and methyl borate, wherein nitrogen borate comprises 0.2% by mass of the conductive lubricant and methyl borate comprises 0.1% by mass of the conductive lubricant;

Zinc dibutyldithiocarbamate is replaced with tin dibutyldithiocarbamate and copper dibutyldithiophosphate, wherein tin dibutyldithiocarbamate accounts for 0.2% of the mass of the conductive lubricant and copper dibutyldithiophosphate accounts for 0.1% of the mass of the conductive lubricant.

Comparative example 7

The conductive lubricant of this comparative example comprises, in mass fraction, 98.85% of mineral base oil, 0.2% of benzotriazole aldehyde-amine condensate, 0.1% of thiadiazole derivative-containing complexing agent, 0.2% of HFT-289 borate, 0.25% of triethanolamine borate, 0.1% of styrene-butadiene copolymer, 0.1% of sorbitan monooleate, 0.1% of polyethylene glycol dioleate, and 0.1% of polyethylene glycol distearate.

Comparative example 8

The conductive lubricant of this comparative example comprises, in mass fraction, 98.85% of mineral base oil, 0.3% of zinc dibutyldithiocarbamate, 0.2% of tri (xylene) phosphate, 0.3% of isopropylated triphenyl phosphate, 0.15% of polyisobutylene, 0.1% of sodium petroleum sulfonate and 0.1% of calcium petroleum sulfonate.

Comparative example 9

The conductive lubricant of this comparative example comprises, in mass fraction, 99.19% of mineral base oil, 0.2% of benzotriazole aldehyde-amine condensate, 0.2% of thiadiazole derivative-containing complexing agent, 0.2% of HFT-289 borate, 0.1% of triethanolamine borate, 0.01% of ethylene-propylene copolymer, 0.05% of sodium petroleum sulfonate and 0.05% of calcium petroleum sulfonate.

Comparative example 10

The conductive lubricant of this comparative example comprises, in mass fraction, 98.84% of mineral base oil, 0.2% of N-phenyl-a naphthylamine, 0.2% of alkylated diphenylamine, 0.1% of 2, 6-di-t-butyl-p-cresol, 0.1% of sulfurized fatty acid ester, 0.25% of sulfurized isobutylene, 0.01% of ethylene-propylene copolymer and 0.3% of zinc naphthenate.

Comparative example 11

The conductive lubricant of this comparative example comprises, in mass fraction, 98.75% of mineral base oil, 0.2% of 4, 4-methylenebis (2, 6-di-tert-butylphenol), 0.2% of triphenyl phosphorothioate, 0.1% of a nitrogen-containing derivative of the phosphorothioate type, 0.3% of zinc dialkyldithiophosphate, 0.15% of polymethacrylate and 0.3% of amid imidazoline.

Test case

(1) The abrasion resistance test is carried out by adopting a four-ball method to test the abrasion resistance of the conductive lubricant of each example and the comparative example at 25 ℃ and 140 ℃, wherein the diameters of the four steel balls are 12.7mm, the stress is 400 N+/-2N, the rotating speed is 1200 r/min+/-60 r/min, the test is carried out for 1min, and the abrasion spot diameter (mm) of each steel ball is observed by a microscope, wherein the measurement precision of the abrasion spot diameter is 0.01mm, and the temperature error is not more than 0.5 ℃.

The conductive lubricants prepared in examples 1 to 19 and comparative examples 1 to 11 were subjected to abrasion resistance tests, respectively, and the results of the abrasion resistance tests are shown in tables 1 to 3.

TABLE 1

Examples	Abrasion resistance at 25C	Abrasion resistance at 140 °c
			Example 1	0.31mm	0.65mm
Example 2	0.45mm	0.86mm
			Example 3	0.14mm	0.25mm
Example 4	0.47mm	0.99mm
			Example 5	0.43mm	0.73mm
Example 6	0.53mm	0.75mm

TABLE 2

TABLE 3 Table 3

Comparative example	Abrasion resistance at 25C	Abrasion resistance at 140 °c
			Comparative example 1	0.65mm	1.32mm
Comparative example 2	1.01mm	2.13mm
			Comparative example 3	0.85mm	1.33mm
Comparative example 4	0.65mm	1.17mm
			Comparative example 5	0.68mm	1.27mm
Comparative example 6	1.11mm	1.51mm
			Comparative example 7	0.87mm	1.36mm
Comparative example 8	0.98mm	1.41mm
			Comparative example 9	0.63mm	1.32mm
Comparative example 10	1.14mm	1.57mm
			Comparative example 11	1.03mm	1.66mm

From the abrasion resistance test results of tables 1 to 3, it is understood that the overall abrasion resistance of examples 1 to 19 is superior to that of comparative examples 1 to 11, particularly the abrasion resistance at 140 ℃, the plaque diameters of examples 1 to 19 are each less than 1.32mm, and the plaque diameters of comparative examples 1 to 11 at 140 ℃ are each greater than 1.32mm;

The antiwear effects of examples 1 to 6 and examples 7 to 19 are shown that the antioxidant of the present invention only selects thiocarbamate, the antiwear agent only selects borate compound, and the mass ratio of the antioxidant to the antiwear agent is between 1:1.1 and 1:5, and the antiwear effect is best as shown by comparison of the data of examples 3 and 6, wherein the antiwear agent selects a mixture of HFT-289 borate and triethanolamine borate.

(2) And (3) testing viscosity performance, namely testing the viscosity of each conductive lubricant under a univariate condition by adopting a capillary viscometer, measuring three groups of data and taking an average value, wherein the temperature error is not more than 0.5 ℃.

The conductive lubricants prepared in examples 1 to 19 and comparative examples 1 to 11 were subjected to viscosity tests, respectively, and the results of the viscosity tests at different temperatures are shown in tables 4 to 6.

TABLE 4 Table 4

TABLE 5

TABLE 6

From the test results in tables 4 to 6, it was found that the viscosities of examples 1 to 19 were all 128 mPas or more and the viscosities of comparative examples 1 to 11 were 127 mPas or less at 30℃and that the viscosities of examples 1 to 19 were also maintained at 80 mPas or more and the viscosities of comparative examples 1 to 11 were already reduced to 75 mPas or less at 70℃as the viscosities were reduced with the increase in temperature.

From the data of examples 1 to 6 and examples 7 to 19, the antioxidant of the present invention only selects thiocarbamate, the antiwear agent only selects borate compound, and the viscosity modifier is used to increase the viscosity of the conductive antiwear agent, thereby reducing the volatility.

(3) The conductive lubricants of examples 1 to 19 and comparative examples 1 to 11 were applied to the surfaces of the metal workpieces, respectively, to ensure the same rotation speed of the workpiece surfaces, and the temperature changes of the workpiece surfaces after detecting different times are shown in tables 7 to 9.

TABLE 7

12h

24h

48h

72h

120h

192h

240h

Example 1

35°C

38°C

40°C

42°C

44°C

46°C

Example 2

35°C

38°C

40°C

45°C

47°C

50°C

53°C

Example 3

35°C

37°C

38°C

40°C

41°C

Example 4

36°C

38°C

43°C

45°C

50°C

52°C

Example 5

35°C

40°C

42°C

45°C

48°C

53°C

55°C

Example 6

35°C

38°C

43°C

47°C

49°C

52°C

54°C

TABLE 8

TABLE 9

Comparative example

12h

24h

48h

72h

120h

192h

240h

Comparative example 1

38°C

40°C

41°C

43°C

52°C

60°C

67°C

Comparative example 2

36°C

38°C

43°C

50°C

52°C

57°C

63°C

Comparative example 3

37°C

38°C

45°C

52°C

61°C

63°C

Comparative example 4

35°C

39°C

46°C

55°C

61°C

67°C

70°C

Comparative example 5

36°C

46°C

53°C

55°C

57°C

60°C

Comparative example 6

38°C

44°C

45°C

47°C

55°C

62°C

Comparative example 7

37°C

38°C

47°C

48°C

52°C

58°C

65°C

Comparative example 8

35°C

36°C

45°C

48°C

55°C

62°C

67°C

Comparative example 9

35°C

39°C

47°C

48°C

50°C

55°C

63°C

Comparative example 10

36°C

39°C

45°C

50°C

54°C

63°C

Comparative example 11

38°C

42°C

45°C

47°C

53°C

56°C

62°C

According to the data shown in tables 7 to 9, the conductive lubricants of examples 1 to 19 were used for 240 hours and the temperatures of most of the workpiece surfaces were kept within 60 ℃, whereas the conductive lubricants of comparative examples 1 to 11 were used for 240 hours and the temperatures of most of the workpiece surfaces were greater than 60 ℃, indicating that the conductive antiwear agent of the present invention had excellent heat dissipation properties.

According to the data of examples 1 to 6 and examples 7 to 19, the antioxidant of the invention only selects thiocarbamate, and the antiwear agent only selects borate compounds, so that the antioxidant has better heat dissipation performance.

(4) The conductive lubricants prepared in examples 1 to 19 and comparative examples 1 to 11 were respectively subjected to volatility tests, and the results of the volatility tests at different temperatures are shown in tables 10 to 12.

Table 10

TABLE 11

Table 12

From the test results of tables 10 to 12, it is understood that the volatility of the conductive lubricants of examples 1 to 19 at 80 ℃ can be reduced to 0 volatilization, and the volatility at 140 ℃ can also be reduced to 1.21% or less, and the conductive lubricants of the present invention have excellent volatility compared to comparative examples 1 to 11.

From the data of examples 1 to 6 and examples 7 to 19, it can be seen that the antioxidant of the present invention only selects thiocarbamates and the antiwear agent only selects borate compounds. And it is apparent from comparison of examples 1 and 2 and examples 3 and 6 that the borate compound of the present invention is a mixture of HFT-289 borate and triethanolamine borate, and has the best anti-volatilization effect.

According to the wear-resistant data, the viscosity index, the volatilization rate and the temperature change data, the addition amount of the wear-resistant agent, the antioxidant and the viscosity modifier in the conductive lubricant prepared by the invention is extremely low, the mixture containing thiocarbamate is selected by the antioxidant, the mixture containing borate compounds is selected by the wear-resistant agent, the proper proportion is set, and the conductive lubricant formed by the synergistic effect of the components has excellent wear-resistant performance and volatility resistance, so that the cost of the conductive lubricant is reduced.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. The conductive lubricant is characterized by comprising base oil, an antioxidant, an antiwear agent, a viscosity improver and an antirust agent, wherein the conductive lubricant contains conductive metal ions, the antioxidant is thiocarbamate, the antiwear agent is a borate compound, the mass fraction of the base oil in the conductive lubricant is more than or equal to 98%, the mass fractions of the antioxidant, the antiwear agent, the viscosity improver and the antirust agent in the conductive lubricant are all less than 1%, and the borate compound is HFT-289 borate and triethanolamine borate.

2. The electrically conductive lubricant according to claim 1, wherein the thiocarbamate is selected from the group consisting of dialkyldithiocarbamates;

3. The electrically conductive lubricant according to claim 1, wherein the thiocarbamate is selected from at least one of a molybdenum salt, a zinc salt, an antimony salt, or a lead salt.

4. The electrically conductive lubricant according to claim 1, wherein the rust inhibitor is at least one selected from the group consisting of alkaline earth element-containing fatty acid salts, alkaline earth element-containing naphthenate salts, lead naphthenate, zinc naphthenate, sodium petroleum sulfonate, barium petroleum sulfonate, calcium petroleum sulfonate, trioleate tallow diamine, rosin amine, sorbitan monooleate, polyethylene glycol dioleate, polyethylene glycol distearate, oleoyl sarcosine amine salts, amidimidazolines, benzotriazoles, alkyl phosphates.

5. The conductive lubricant according to any one of claims 1 to 4, wherein the conductive lubricant comprises, in mass fraction, 98% or more of base oil, 0.1% to 0.7% of thiocarbamate, 0.1% to 0.5% of boric acid ester compound, 0.01% to 0.5% of viscosity improver, and 0.3% or less of rust inhibitor.

6. The conductive lubricant according to claim 1, wherein the mass ratio of the thiocarbamate to the borate compound is 1:1.1-1:5.