CN114956029B - Copper phosphate nano-sheet, preparation method and application - Google Patents
Copper phosphate nano-sheet, preparation method and application Download PDFInfo
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- CN114956029B CN114956029B CN202210576744.2A CN202210576744A CN114956029B CN 114956029 B CN114956029 B CN 114956029B CN 202210576744 A CN202210576744 A CN 202210576744A CN 114956029 B CN114956029 B CN 114956029B
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- RAOSIAYCXKBGFE-UHFFFAOYSA-K [Cu+3].[O-]P([O-])([O-])=O Chemical compound [Cu+3].[O-]P([O-])([O-])=O RAOSIAYCXKBGFE-UHFFFAOYSA-K 0.000 title claims abstract description 60
- 239000002135 nanosheet Substances 0.000 title claims abstract description 58
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000010687 lubricating oil Substances 0.000 claims abstract description 30
- 239000002199 base oil Substances 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000000243 solution Substances 0.000 claims description 19
- 239000008055 phosphate buffer solution Substances 0.000 claims description 16
- 230000001050 lubricating effect Effects 0.000 claims description 13
- 239000003921 oil Substances 0.000 claims description 11
- 239000002244 precipitate Substances 0.000 claims description 9
- 229910000365 copper sulfate Inorganic materials 0.000 claims description 6
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 6
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims description 6
- 229910000403 monosodium phosphate Inorganic materials 0.000 claims description 6
- 235000019799 monosodium phosphate Nutrition 0.000 claims description 6
- 239000012266 salt solution Substances 0.000 claims description 6
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 claims description 6
- 230000002378 acidificating effect Effects 0.000 claims description 3
- 238000005119 centrifugation Methods 0.000 claims description 2
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 claims description 2
- XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Chemical compound [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 claims description 2
- 238000010908 decantation Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 230000005484 gravity Effects 0.000 claims description 2
- 239000002480 mineral oil Substances 0.000 claims description 2
- 235000010446 mineral oil Nutrition 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 238000004062 sedimentation Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- BTEUAVLBRJIYOO-UHFFFAOYSA-K O.O.O.P(=O)([O-])([O-])[O-].[Cu+3] Chemical compound O.O.O.P(=O)([O-])([O-])[O-].[Cu+3] BTEUAVLBRJIYOO-UHFFFAOYSA-K 0.000 claims 3
- 239000000654 additive Substances 0.000 abstract description 21
- 230000009467 reduction Effects 0.000 abstract description 18
- 230000000996 additive effect Effects 0.000 abstract description 12
- 239000002270 dispersing agent Substances 0.000 abstract description 10
- 238000005299 abrasion Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 5
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 4
- 238000002474 experimental method Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 3
- 101150092791 PAO4 gene Proteins 0.000 description 16
- 235000019198 oils Nutrition 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000002086 nanomaterial Substances 0.000 description 7
- 239000002064 nanoplatelet Substances 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 239000013078 crystal Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 229910001069 Ti alloy Inorganic materials 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- KZNICNPSHKQLFF-UHFFFAOYSA-N succinimide Chemical compound O=C1CCC(=O)N1 KZNICNPSHKQLFF-UHFFFAOYSA-N 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000001000 micrograph Methods 0.000 description 3
- 231100000241 scar Toxicity 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000001603 reducing effect Effects 0.000 description 2
- 229960002317 succinimide Drugs 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- RYYWUUFWQRZTIU-UHFFFAOYSA-N Thiophosphoric acid Chemical class OP(O)(S)=O RYYWUUFWQRZTIU-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001879 copper Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 229920001002 functional polymer Polymers 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 239000006259 organic additive Substances 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- -1 preferably Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/37—Phosphates of heavy metals
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
- C10M125/24—Compounds containing phosphorus, arsenic or antimony
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
- C10M169/044—Mixtures of base-materials and additives the additives being a mixture of non-macromolecular and macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/10—Particle morphology extending in one dimension, e.g. needle-like
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/085—Phosphorus oxides, acids or salts
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
- C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
- C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms used as base material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/28—Amides; Imides
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/56—Boundary lubrication or thin film lubrication
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/64—Environmental friendly compositions
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Inorganic Chemistry (AREA)
- Lubricants (AREA)
Abstract
The invention discloses a copper phosphate nano-sheet, a preparation method and application thereof. Copper phosphate nano-sheets and dispersing agents are added into base oil, wherein the mass percentage of the copper phosphate nano-sheets in the base oil is 0.0001-50%, and the mass percentage of the dispersing agents in the base oil is 0-10%. The additive realizes excellent antifriction and antiwear effects, and compared with blank lubricating oil, the friction coefficient reduction rate is up to more than 60%, and the abrasion loss reduction rate is up to more than 95%. Compared with the prior art, the invention has the advantages that the preparation method is simple and easy to implement, the experimental process is mild and simple, no special equipment is needed, no intense experimental method such as high temperature is needed, no organic reagent is involved, and the invention accords with the green environment-friendly route. The source of raw materials is wide and economical, and can be widely applied to lubricating oil additives.
Description
Technical Field
The invention belongs to the field of lubricating oil, and relates to a lubricating oil additive, in particular to a copper phosphate nano-sheet, a preparation method and application.
Background
Friction and wear are ubiquitous and critical to carbon release. With large friction, a large amount of energy is required to overcome. However, currently the energy sources for industry and transportation are mainly fossil fuels, which produce a significant portion of greenhouse gas emissions. And more than 50% of world energy is lost by friction and abrasion on the global scale, which is one of the main reasons for scrapping materials and equipment. Since friction is unavoidable, controlling friction and reducing wear are of great importance in modern technology, and one of the methods available in the industry to date is lubrication with lubricating oil.
The additives in the base oil can achieve significant friction reduction and excellent antiwear properties in the friction pair. Existing additives can be divided into four categories: organic friction modifiers, functional polymers, oil-soluble organic additives, and nanomaterials. As a new material, nanomaterials have exerted their advantages in the tribology field, and they provide excellent lubricating properties as lubricating oil additives. In the last decade, there has been an increasing interest in the discovery of nanomaterials as lubricating oil additives.
The graphene-based lubricating oil additive has obvious lubricating effect, but has complex preparation process and high cost, and is not easy for industrial production. There are also some novel nanomaterials which have various disadvantages that are not easy to implement for application. There is a need to find a nanomaterial additive that is simple and reliable in preparation process, economical and easy to operate.
Disclosure of Invention
The invention aims to provide a preparation method of a copper phosphate nano-sheet, which utilizes a cupric salt solution to be added into an acidic phosphate buffer solution to prepare nano-sheet copper phosphate, expands the variety of nano-materials and expands the application range of nano-copper phosphate.
Another object of the present invention is to provide a use of the copper phosphate nano-sheet for improving friction performance of lubricating oil, wherein the prepared copper phosphate contains crystal water or does not contain crystal water (the content of crystal water is determined by a drying mode and a washing reagent), the thickness of the nano-sheet is below 30nm, the nano-sheet is used as a lubricating oil additive, and is added into base oil, so that excellent antifriction and antiwear effects are achieved, the friction coefficient reduction rate is up to more than 60% and the wear loss reduction rate is up to more than 95% compared with a blank lubricating oil.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a preparation method of a copper phosphate nano-sheet, which is characterized by comprising the following steps:
adding the cupric salt solution into an acidic phosphate buffer solution, and separating precipitate after reaction to obtain the copper phosphate nano-sheet.
In the above technical solution, preferably, the divalent copper salt solution includes a copper sulfate solution, a copper chloride solution, and a copper nitrate solution.
In the above technical scheme, preferably, the phosphate buffer solution is formed by mixing disodium hydrogen phosphate and sodium dihydrogen phosphate solution, and the pH value of the phosphate buffer solution is less than or equal to 7.
In the above technical scheme, preferably, the separation method after the reaction includes decantation, gravity sedimentation, filtration and centrifugation.
The invention also protects a copper phosphate nano-sheet, which is characterized in that: the preparation method is adopted.
The invention also provides application of the copper phosphate nano-sheet as a lubricating oil additive for improving lubricating performance of base oil.
The invention also provides a method for improving the lubricating performance of the lubricating oil, which is characterized by comprising the following steps of: the dispersant and the copper phosphate nano-sheet prepared by the preparation method of any one of claims 1 to 4 are added into the base oil, wherein the mass percentage of the copper phosphate nano-sheet in the base oil is 0.0001 to 50%, and the mass percentage of the dispersant in the base oil is 0 to 10%.
In the above technical solution, preferably, the base oil is mineral oil, semisynthetic oil, synthetic oil or vegetable oil.
In the above technical solution, preferably, the dispersant is an inorganic dispersant, an organic dispersant or a polymer dispersant.
In the above technical solution, preferably, the copper phosphate contains crystal water or does not contain crystal water, and the thickness of the copper phosphate nano-sheet is 1-30nm.
The copper phosphate nanoplatelets prepared by the present invention are essentially different from the phosphorothioate series or alkyl dithiophosphates (such as CuDDP or ZnDDP) commonly used as lubricating oil additives. The improved substances are oil-soluble polymer substances and liquid, can be directly dissolved in oil, and have the action mechanism that the substances react chemically in the friction process to form an oil film at a friction interface so as to promote lubrication; or long molecular chains intertwine with the oil molecules, thereby increasing the oil film thickness. The technical proposal relates to a copper phosphate nano-sheet, the molecular structure is Cu 3 (PO 4 ) 2 ·3H 2 O, the solid, belong to a crystalline substance, lamellar nano material, the mechanism of action is that copper phosphate nano sheet gets into the friction area, avoids the direct contact between the friction pair, changes the friction between steel and the steel into the friction between steel and the copper phosphate nano sheet to show the coefficient of friction that has reduced, and reduce the grinding mark. The mechanism is shown in fig. 5.
Compared with the prior art, the invention has the advantages that:
(1) The preparation method is simple and easy to implement, the experimental process is mild and simple, no special equipment is needed, no intense experimental method such as high temperature is needed, no organic reagent is involved, and the method accords with a green environment-friendly route.
(2) The source of raw materials is wide and economical, and can be widely applied to lubricating oil additives.
(3) The excellent antifriction and antiwear effects are realized, the reduction rate of the friction coefficient is up to more than 60%, and the reduction rate of the abrasion loss is up to more than 95%.
Drawings
Fig. 1 shows a scanning electron microscope image of the copper phosphate nanoplatelets in example 1.
Fig. 2 shows a scanning electron microscope image of the copper phosphate nanoplatelets in example 2.
Fig. 3 shows the coefficient of friction reducing effect of the copper phosphate nanoplatelet lubricating oil additive of example 1: FIG. 3 (a) is the coefficient of friction of pure PAO4 oil; FIG. 3 (b) is the coefficient of friction of PAO4 with copper phosphate nanoplatelets added.
FIG. 4 shows a 3D white light picture of the wear scar of the copper phosphate nanoplatelet lubricating oil additive of example 1: FIG. 4 (a) is a wear scar for pure PAO4 oil; FIG. 4 (b) shows the wear scar of PAO4 with copper phosphate nanoplatelets added.
FIG. 5 is a schematic diagram of the lubrication mechanism of the prepared copper phosphate nano-sheet in lubricating oil.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present invention and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
Example 1
The copper phosphate nano-sheet is used as a lubricating oil additive to be added into base oil to improve the lubricating effect, and comprises the following components in percentage by mass: copper phosphate nano-sheet 0.55g, PAO4 base oil 5g.
(1) Preparation of copper phosphate nanosheets
93.5mL of 0.2mol/L sodium dihydrogen phosphate and 6.5mL of 0.2mol/L disodium hydrogen phosphate are mixed to obtain a phosphate buffer solution with the pH value of 5.7, 10mL of 0.12mol/L copper sulfate solution is added into the phosphate buffer solution, the solution is centrifuged to obtain a precipitate, namely copper phosphate nano-sheets, and the copper phosphate nano-sheets are dried in a drying oven at 65 ℃ and then weighed 0.55g into 5g of PAO4 base oil.
The scanning electron microscope diagram of the copper phosphate nano-sheet is shown in figure 1.
(2) Antifriction and antiwear measuring method
Ball disc reciprocating friction test is carried out on the Rtec friction wear tester: GCr15 steel balls with the diameter of 6.3mm are rubbed with a TA5 titanium alloy disk with the diameter of 4 x 4cm in a reciprocating manner.
Test conditions: load 10N, speed 8Hz (line speed 128 mm/s)
(3) Antifriction and antiwear result comparison analysis
Compared with a blank PAO4, the friction coefficient reduction rate is 65%, and the abrasion loss reduction rate is 98%.
The coefficient of friction reduction effect is shown in fig. 3.
The 3D white light picture is as in fig. 4.
Example 2
The copper phosphate nano-sheet is used as a lubricating oil additive to be added into base oil to improve the lubricating effect, and comprises the following components in percentage by mass: copper phosphate nano-sheet 0.26g, PAO4 base oil 5g.
(1) Preparation of copper phosphate nanosheets
93.5mL of 0.2mol/L sodium dihydrogen phosphate and 6.5mL of 0.2mol/L disodium hydrogen phosphate are mixed to obtain a phosphate buffer solution with the pH value of 5.7, 10mL of 0.12mol/L copper sulfate solution is added into the phosphate buffer solution, the solution is centrifuged to obtain a precipitate, ethanol is used for washing for 1 to 3 times to obtain copper phosphate nano-sheets, and the copper phosphate nano-sheets are dried in a baking oven with the temperature of 70 ℃ and then 0.26g of the copper phosphate nano-sheets are weighed and added into 5g of PAO4 base oil.
The scanning electron microscope image of the copper phosphate nano-sheet is shown in figure 2.
(2) Antifriction and antiwear measuring method
Ball disc reciprocating friction test is carried out on the Rtec friction wear tester: GCr15 steel balls with the diameter of 6.3mm are rubbed with a TA5 titanium alloy disk with the diameter of 4 x 4cm in a reciprocating manner.
Test conditions: load 10N, speed 10Hz (line speed 160 mm/s)
(3) Antifriction and antiwear result comparison analysis
Compared with a blank PAO4, the friction coefficient reduction rate is 52 percent, and the abrasion loss reduction rate is 65 percent.
Example 3
The copper phosphate nano-sheet is used as a lubricating oil additive to be added into base oil to improve the lubricating effect, and comprises the following components in percentage by mass: copper phosphate nano-sheet 0.55g, PAO4 base oil 5g.
(1) Preparation of copper phosphate nanosheets
93.5mL of 0.2mol/L sodium dihydrogen phosphate and 6.5mL of 0.2mol/L disodium hydrogen phosphate are mixed to obtain a phosphate buffer solution with the pH value of 5.7, 10mL of 0.12mol/L copper sulfate solution is added into the phosphate buffer solution, and the mixture is centrifuged to obtain a precipitate, namely the copper phosphate nano-sheet, the precipitate is washed by petroleum ether for a plurality of times, and the precipitate is directly mixed with PAO4 without drying. And (3) stirring at 90 ℃ for 2 hours to fully volatilize petroleum ether, so as to prepare the oil sample containing the copper phosphate nano-sheets. And calculating according to the initial weight of the oil sample and the weight after heating treatment to obtain the mass percentage of the copper phosphate nano-sheet. PAO with certain mass can be added to adjust the mass percentage.
(2) Antifriction and antiwear measuring method
Ball disc reciprocating friction test is carried out on the Rtec friction wear tester: GCr15 steel balls with the diameter of 6.3mm are rubbed with a TA5 titanium alloy disk with the diameter of 4 x 4cm in a reciprocating manner.
Test conditions: load 10N, speed 8Hz (line speed 128 mm/s)
(3) Antifriction and antiwear result comparison analysis
Compared with a blank PAO4, the friction coefficient reduction rate is 69%, and the abrasion loss reduction rate is 98%.
Example 4
The copper phosphate nano-sheet is used as a lubricating oil additive to be added into base oil to improve the lubricating effect, and comprises the following components in percentage by mass: 0.55g of copper phosphate nano-sheet, 1g of dispersant T154 polyisobutenyl succinimide and 5g of PAO4 base oil.
(1) Preparation of copper phosphate nanosheets
68.5mL of 0.2mol/L sodium dihydrogen phosphate and 31.5mL of 0.2mol/L disodium hydrogen phosphate are mixed to obtain a phosphate buffer solution with the pH value of 6.5, 15mL of 0.2mol/L copper sulfate solution is added into the phosphate buffer solution, the solution is centrifuged to obtain a precipitate, namely copper phosphate nano-sheets, the copper phosphate nano-sheets are placed in a 65 ℃ oven for drying, 0.55g of the copper phosphate nano-sheets is weighed and added into 5g of PAO4 base oil, and 1g of polyisobutenyl succinimide serving as a dispersing agent T154 is added. And then dispersed by ultrasonic for 30min.
(2) Antifriction and antiwear measuring method
Ball disc reciprocating friction test is carried out on the Rtec friction wear tester: GCr15 steel balls with the diameter of 6.3mm are rubbed with a TA5 titanium alloy disk with the diameter of 4 x 4cm in a reciprocating manner.
Test conditions: load 10N, speed 8Hz (line speed 128 mm/s)
(3) Antifriction and antiwear result comparison analysis
Compared with a blank PAO4, the friction coefficient reduction rate is 67%, and the abrasion loss reduction rate is 98%.
In summary, the invention provides a method for adding copper phosphate nano-sheets as lubricating oil additives to base oil to improve lubricating effect, wherein a precipitate obtained by adding a cupric salt solution to a phosphate buffer solution with pH less than 7 is the copper phosphate nano-sheets. The thickness of the nano sheet is below 30nm, and when the nano sheet is added into lubricating oil, excellent antifriction and antiwear effects are realized, and compared with blank lubricating oil, the friction coefficient reduction rate is up to more than 60%, and the wear loss reduction rate is up to more than 95%. The experimental method is simple and easy to implement, wide in raw material sources, mild and simple in experimental process, free of intense experimental methods such as high temperature and the like, and free of any organic reagent. The invention has simple equipment, accords with a green environment-friendly route, and can be widely applied to lubricating oil additives.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A method for improving lubricating performance of lubricating oil is characterized by comprising the following steps: adding copper phosphate nano-sheets into base oil, wherein the copper phosphate nano-sheets are copper phosphate trihydrate nano-sheets, and the mass percentage of the copper phosphate trihydrate nano-sheets in the base oil is 5.2-50%;
the preparation method of the copper phosphate trihydrate nano-sheet comprises the following steps:
adding a cupric salt solution into an acidic phosphate buffer solution, and separating a precipitate after reaction to obtain a copper phosphate nano-sheet;
the base oil is mineral oil or synthetic oil;
the phosphate buffer solution is formed by mixing disodium hydrogen phosphate and sodium dihydrogen phosphate solution, and the pH value of the phosphate buffer solution is less than or equal to 7.
2. The method for improving the lubricating property of lubricating oil according to claim 1, wherein: the cupric salt solution comprises copper sulfate solution, copper chloride solution and copper nitrate solution.
3. The method for improving the lubricating property of lubricating oil according to claim 1, wherein: the separation method after the reaction includes decantation, gravity sedimentation, filtration and centrifugation.
4. The method for improving the lubricating property of lubricating oil according to claim 1, wherein: the thickness of the copper phosphate nano sheet is 1-30nm.
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