CN116606572B - Modified nano boron carbide/molybdenum disulfide reinforced polytetrafluoroethylene self-lubricating composite coating and preparation method thereof - Google Patents
Modified nano boron carbide/molybdenum disulfide reinforced polytetrafluoroethylene self-lubricating composite coating and preparation method thereof Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 93
- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 91
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 91
- 239000011248 coating agent Substances 0.000 title claims abstract description 90
- -1 polytetrafluoroethylene Polymers 0.000 title claims abstract description 83
- 239000002131 composite material Substances 0.000 title claims abstract description 72
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910052580 B4C Inorganic materials 0.000 title claims abstract description 35
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 229910052982 molybdenum disulfide Inorganic materials 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- RGPUVZXXZFNFBF-UHFFFAOYSA-K diphosphonooxyalumanyl dihydrogen phosphate Chemical compound [Al+3].OP(O)([O-])=O.OP(O)([O-])=O.OP(O)([O-])=O RGPUVZXXZFNFBF-UHFFFAOYSA-K 0.000 claims abstract description 18
- 238000001035 drying Methods 0.000 claims abstract description 16
- 238000005507 spraying Methods 0.000 claims abstract description 13
- 229920002312 polyamide-imide Polymers 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000004962 Polyamide-imide Substances 0.000 claims abstract description 4
- 238000001723 curing Methods 0.000 claims abstract description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 9
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 8
- 239000000758 substrate Substances 0.000 claims description 8
- 239000012767 functional filler Substances 0.000 claims description 7
- 239000011159 matrix material Substances 0.000 claims description 7
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000005238 degreasing Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 4
- 239000000706 filtrate Substances 0.000 claims 2
- 230000003213 activating effect Effects 0.000 claims 1
- 239000012752 auxiliary agent Substances 0.000 claims 1
- 239000000243 solution Substances 0.000 claims 1
- 229920000642 polymer Polymers 0.000 abstract description 8
- 238000005461 lubrication Methods 0.000 abstract description 4
- 239000000843 powder Substances 0.000 description 14
- 238000012986 modification Methods 0.000 description 13
- 230000004048 modification Effects 0.000 description 13
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- 239000000853 adhesive Substances 0.000 description 9
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- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 8
- 239000002518 antifoaming agent Substances 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
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- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 244000137852 Petrea volubilis Species 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
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- 238000000926 separation method Methods 0.000 description 2
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- MTEZSDOQASFMDI-UHFFFAOYSA-N 1-trimethoxysilylpropan-1-ol Chemical compound CCC(O)[Si](OC)(OC)OC MTEZSDOQASFMDI-UHFFFAOYSA-N 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
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- 239000011230 binding agent Substances 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
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- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
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- 125000000524 functional group Chemical group 0.000 description 1
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- 239000010410 layer Substances 0.000 description 1
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- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
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- 239000002699 waste material Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C09D127/18—Homopolymers or copolymers of tetrafluoroethene
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/61—Additives non-macromolecular inorganic
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
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- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/65—Additives macromolecular
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
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- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3009—Sulfides
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/327—Aluminium phosphate
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- C—CHEMISTRY; METALLURGY
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention discloses a modified nano boron carbide/molybdenum disulfide reinforced polytetrafluoroethylene self-lubricating composite coating and a preparation method thereof, and belongs to the technical field of high polymer composite materials. The preparation steps of the invention are as follows: 1. dispersing nano boron carbide in the prepared KH-560 solution to modify the surface of the nano boron carbide; 2. uniformly mixing modified nano boron carbide, molybdenum disulfide, aluminum oxide, aluminum dihydrogen phosphate, polyamide imide and polytetrafluoroethylene to prepare polytetrafluoroethylene coating; 3. and uniformly spraying polytetrafluoroethylene coating on the surface of a metal product, and heating and curing after drying. The polytetrafluoroethylene self-lubricating composite coating prepared by the invention has excellent lubricity, wear resistance and good stability, and can be widely applied to the field of mechanical lubrication.
Description
Technical Field
The invention belongs to the technical field of polymer composite materials, and particularly relates to a modified nano boron carbide/molybdenum disulfide reinforced polytetrafluoroethylene self-lubricating composite coating and a preparation method thereof.
Background
In industrial production, frictional wear is unavoidable, and excessive wear changes the precision and shape of mechanical parts, which in turn affects the performance of the mechanical equipment to shorten the life of the mechanical equipment, and causes waste of resources and irreversible influence on environmental pollution. In order to solve the problem, polymer composite coatings have been used in industry more and more widely in recent years, especially in lubrication and antifriction of mechanical parts.
Polytetrafluoroethylene (PTFE) is an artificially synthesized organic polymer material, and has excellent chemical stability, good corrosion resistance, flame retardance, insulation, abrasion resistance, and the like. However, because of the poor adhesion of the molecular chains, separation between coating layers easily occurs when the coating is used as a coating, resulting in poor abrasion resistance of the pure polytetrafluoroethylene coating. To overcome this disadvantage, the most common method at present is to fill polytetrafluoroethylene with functional filler, which enhances its wear resistance and antifriction properties while retaining the excellent properties of polytetrafluoroethylene.
The nanometer boron carbide (B 4 C) powder has the characteristics of high hardness, high temperature resistance, corrosion resistance and the like, and belongs to an excellent wear-resistant material. When the composite coating is used as filler, the composite coating can be provided with better wear resistance, high temperature resistance and corrosion resistance. However, the boron nitride powder which is not subjected to surface modification has agglomeration phenomenon, poor dispersibility and difficult uniform distribution in a coating. The surface modification introduces some active functional groups into the nano boron nitride powder, so that the nano boron nitride powder has stronger interaction with a high molecular organic material, the bonding property of the nano boron nitride powder and a coating is improved, and the adhesive force and the wear resistance of the coating are improved.
Molybdenum disulfide (MoS 2) has excellent tribological properties, and is a commonly used solid lubricating material. The molybdenum disulfide can adapt to a high-temperature working environment, and is more stable and durable without periodic replacement. Under the condition of dry friction, molybdenum disulfide can fill micro pits on the surface of the friction pair, and a stable lubricating film is formed on the surface of the friction pair, so that the friction coefficient and the abrasion loss are reduced; under the condition of oil lubrication, the molybdenum disulfide can play a role in filling and enhancing a lubricating oil film, so that the quality and stability of lubrication are improved.
The selection of proper functional filler and proper proportion is particularly important, so that the processing technology is improved, the forming efficiency is improved, and the defects of poor wear resistance, easy interlayer separation and easy creep are overcome. The nano boron nitride powder is added to improve the surface hardness of the coating and the wear resistance of the coating; the addition of molybdenum disulfide powder with self-lubricating properties can increase the lubricating properties of the coating. Therefore, the development of the modified nano boron carbide/molybdenum disulfide reinforced polytetrafluoroethylene self-lubricating composite coating with excellent wear resistance and lubricating performance and the preparation method thereof have great practical significance and have great application prospects in the industrial field.
Disclosure of Invention
In order to solve the problems in the prior art and overcome the defects of the traditional polymer coating, the polytetrafluoroethylene self-lubricating composite coating provided by the invention does not need secondary modification and has good wear resistance and lubricating property. Compared with the traditional polymer coating, the nano boron nitride powder is subjected to surface modification, so that the bonding property of the nano boron nitride powder and polytetrafluoroethylene is greatly improved. The aluminum dihydrogen phosphate and the polyamide imide are used as the adhesive to strengthen the adhesion between the aluminum dihydrogen phosphate and the matrix, so that the adhesive force is stronger. Molybdenum disulfide is added to improve the lubricating property of the coating, so that the coating has more excellent wear resistance, mechanical stability and lubricating property.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
The preparation method of the modified nano boron carbide/molybdenum disulfide reinforced polytetrafluoroethylene self-lubricating composite coating comprises the following steps:
Step one, surface modification of nano boron carbide
The nano boron carbide is washed by absolute ethyl alcohol and soaked for 10min, filtered and dried and activated for 4 hours at 120 ℃ in a drying box. Nano boron carbide is prepared by the following steps of 1:10, mechanically stirring the mixture in the prepared KH-560 solution for 20min to fully hydrolyze the mixture, adjusting the pH value to 4-6 by acetic acid, reacting at 60 ℃ for 3h (carrying out ultrasonic oscillation for 2min at intervals of 0.5 h), filtering, washing the mixture with absolute ethyl alcohol for several times until the pH value is neutral, and drying the mixture at 60 ℃ for 24h. And drying to obtain a target sample.
Step two, preparation of polytetrafluoroethylene self-lubricating composite coating
A polytetrafluoroethylene composite solution was first prepared comprising 55wt% Polytetrafluoroethylene (PTFE), 20wt% aluminum dihydrogen phosphate (AP), 10wt% Polyamideimide (PAI), 5wt% deionized water, 10wt% alumina (Al 2O3). Adding modified nano boron carbide (B 4 C) and molybdenum disulfide (MoS 2) into the polytetrafluoroethylene composite solution, wherein the adding proportion is that the polytetrafluoroethylene composite solution: boron carbide (B 4 C) was 100:6, polytetrafluoroethylene composite solution: molybdenum disulfide (MoS 2) was 100:4, and 0.1 to 1wt% of an antifoaming agent. After mixing, stirring for 3 hours by using a magnetic stirrer, and performing ultrasonic dispersion for 5 minutes every 30 minutes to obtain the polytetrafluoroethylene self-lubricating composite coating.
Step three, preparation of modified nano boron carbide/molybdenum disulfide reinforced polytetrafluoroethylene composite coating
Uniformly spraying the modified polytetrafluoroethylene self-lubricating composite coating on the surface of a metal substrate, then placing a sprayed sample in a muffle furnace for solidification, and then cooling to room temperature along with the furnace to obtain the modified nano boron carbide/molybdenum disulfide reinforced polytetrafluoroethylene composite coating.
Preferably, the particle size of the nano boron carbide with the solid content of 60% of the polytetrafluoroethylene emulsion is 500nm, and the purity is 99.5%; the particle size of the molybdenum disulfide is 100nm, and the purity is 99.5%; the solid content of the polytetrafluoroethylene emulsion is 60 percent.
Preferably, in step one, the KH-560 solution is characterized in that: it contains 1wt% gamma-glycidoxypropyl trimethoxysilane (KH-560), 90wt% absolute ethanol, 9wt% deionized water.
Preferably, in the second step, the main component of the defoaming agent (NXZ) is boron oil, polyether, higher alcohol, mineral oil, or the like; the surfactant (FC-4430) is a fluoroaliphatic polymer ester.
Preferably, in the third step, before the spraying, the surface pretreatment is further performed on the metal substrate; the pretreatment comprises degreasing, polishing to a surface roughness of 0.2-0.3 mu m, washing with acetone and drying.
Preferably, in the third step, the spraying angle is 45 degrees, the spraying pressure is 0.20MPa, the distance between the spray gun and the substrate is 15-20 cm, and the thickness of the coating is controlled to be 25-40 mu m.
The modified nano boron carbide/molybdenum disulfide reinforced polytetrafluoroethylene self-lubricating composite coating prepared by the method.
The beneficial effects of the invention are as follows:
The invention provides a modified nano boron carbide/molybdenum disulfide reinforced polytetrafluoroethylene self-lubricating composite coating and a preparation method thereof, and the modified nano boron carbide/molybdenum disulfide reinforced polytetrafluoroethylene self-lubricating composite coating has the following advantages:
1. the invention provides a polytetrafluoroethylene self-lubricating composite coating, which aims to solve the problems of the traditional polymer coating and overcome the defects of the traditional polymer coating. Compared with the traditional polymer coating, the coating disclosed by the invention does not need secondary modification and has excellent wear resistance and lubricating property.
2. According to the invention, KH-560 nano boron nitride powder is used for surface modification, and KH-560 can form chemical bonds on the surface of nano boron carbide powder and establish a cross-linking structure between the powder and a matrix material. This helps to improve the dispersibility and stability of the powder, reduce the aggregation of the powder, and enhance the mechanical and wear resistance properties of the coating. Meanwhile, KH-560 can also provide certain surface activity, enhance the compatibility of the coating material and the matrix material, and improve the adhesive force and chemical resistance of the coating.
3. The invention adopts the aluminum dihydrogen phosphate and the polyamide imide as the adhesive, thereby further enhancing the adhesion between the coating and the matrix. The adhesive is matched for use, so that the coating has better durability and anti-falling capability, can keep the integrity under various environmental conditions, and has more excellent wear resistance.
4. Molybdenum disulfide is added into the coating to improve the lubricating performance of the coating. The use of the solid lubricant enables the coating to have excellent lubricating performance, and friction and abrasion can be reduced, so that the service life of the coating is prolonged, and the performance stability is improved.
5. The polytetrafluoroethylene self-lubricating composite coating has excellent wear resistance, mechanical stability and lubricating property. The method can be directly applied to the related fields without secondary modification, and effectively solves the problems and the defects existing in the prior art. The coating has significant advantages in reducing friction, improving durability, and providing excellent lubricating properties, and provides significant benefits to related industries.
6. The self-lubricating composite coating of the invention has excellent advantages in the preparation process. First, the coating has excellent uniformity using a spray-heat curing method, thereby improving the quality and performance of the coating. Second, the coatings of the present invention exhibit a significant reduction in surface cracking, which helps to enhance the structural integrity of the coating, improving its durability and stability.
7. The preparation method of the invention is very simple and efficient. The preparation of the coating is realized by reasonably controlling the reaction conditions, including temperature, time and reactant proportion. The mildness of these reaction conditions ensures the stability of the coating material and its components, while reducing unnecessary energy and resource consumption. In addition, the raw materials and equipment costs required for the preparation process are relatively low, so that the method has economic practicability and commercial potential.
Drawings
FIG. 1 is a schematic diagram of a friction experiment of a self-lubricating composite coating of polytetrafluoroethylene according to the invention.
Fig. 2 is a histogram of average friction coefficients for six sets of embodiments.
Fig. 3 is a bar graph of the average frictional wear for six sets of examples.
FIG. 4 is a three-position profile of six sets of example friction marks.
Description of the embodiments
The invention will be further described with reference to specific embodiments for a clearer understanding of the technical means, innovative features and objects achieved and effects of the present invention.
Example 1
In the embodiment, the modified nano boron carbide/molybdenum disulfide reinforced polytetrafluoroethylene self-lubricating composite coating and the preparation method thereof comprise the following steps:
Step one, surface modification of nano boron carbide
1.1 The nano boron carbide is washed by absolute ethyl alcohol and soaked for 10min, filtered and dried and activated for 4 hours at 120 ℃ in a drying box.
1.2 Preparing KH-560 solution: 1wt% of gamma-glycidol ether oxypropyl trimethoxysilane (KH-560), 90wt% of absolute ethanol and 9wt% of deionized water are added in the solution, and the mixture is uniformly mixed for standby.
1.3 Nano boron carbide is prepared by the following steps of 1:10, mechanically stirring the mixture in the prepared KH-560 solution for 20min to fully hydrolyze the mixture, adjusting the pH value to 4-6 by acetic acid, reacting at 60 ℃ for 3h (carrying out ultrasonic oscillation for 2min at intervals of 0.5 h), filtering, washing the mixture with absolute ethyl alcohol for several times until the pH value is neutral, and drying the mixture at 60 ℃ for 24h. And drying to obtain the target sample.
Step two, preparation of polytetrafluoroethylene self-lubricating composite coating
2.1 Firstly, preparing polytetrafluoroethylene composite solution: 11g of Polytetrafluoroethylene (PTFE), 4g of aluminum dihydrogen phosphate (AP), 2g of Polyamideimide (PAI) 1g of deionized water and 2g of aluminum oxide (Al 2O3) are added in sequence.
2.2 To the polytetrafluoroethylene composite solution were added 0.8g of modified nano boron carbide (B 4 C) and 1.2g of molybdenum disulfide (MoS 2), and 0.2g of an antifoaming agent.
2.3 Mixing: stirring for 3 hours by using a magnetic stirrer, and performing ultrasonic dispersion for 5 minutes every 30 minutes to obtain the polytetrafluoroethylene self-lubricating composite coating.
Step three, preparation of polytetrafluoroethylene self-lubricating composite coating
3.1 Selecting a tin bronze sample block with the thickness of 10mm multiplied by 20mm as a matrix for surface pretreatment; degreasing by cleaning with acetone, polishing with 200-mesh sand paper to remove surface burrs and oxide layers, polishing with 800-mesh sand paper to a surface roughness of 0.2-0.3 μm, and finally cleaning with acetone and drying.
3.2 Uniformly spraying the polytetrafluoroethylene self-lubricating composite coating on the surface of a metal substrate by using a spray gun, wherein the spraying angle is 45 degrees, the spraying pressure is 0.20MPa, the distance between the spray gun and the substrate is 15-20 cm, and the thickness of the coating is controlled to be 25-40 mu m.
3.3 And then placing the sprayed sample into a muffle furnace for curing, and using the muffle furnace for gradient curing, wherein the heating procedure is as follows: heating uniformly from room temperature to 50 ℃ for 20 minutes, and preserving heat for 20 minutes; heating to 120 ℃ uniformly for 20 minutes, and preserving heat for 20 minutes; heating to 380 deg.c for 20 min and maintaining for 20 min. And finally cooling to room temperature along with the furnace.
Example 2
The embodiment is basically the same as the first embodiment, and compared with the first embodiment, the method does not modify nano boron carbide, and comprises the following steps:
Step one, washing nano boron carbide with absolute ethyl alcohol, soaking for 10min, filtering, and drying in a drying oven at 120 ℃.
Step two, preparing polytetrafluoroethylene composite solution firstly in step 2.1: 11g of Polytetrafluoroethylene (PTFE), 4g of aluminum dihydrogen phosphate (AP), 2g of Polyamideimide (PAI) 1g of deionized water and 2g of aluminum oxide (Al 2O3) are added in sequence.
2.2 To the polytetrafluoroethylene composite solution were added 0.8g of unmodified nano boron carbide (B 4 C) and 1.2g of molybdenum disulfide (MoS 2), and 0.2g of an antifoaming agent.
2.3 Mixing: stirring for 3 hours by using a magnetic stirrer, and performing ultrasonic dispersion for 5 minutes every 30 minutes to obtain the polytetrafluoroethylene self-lubricating composite coating.
Step three, preparing a polytetrafluoroethylene self-lubricating composite coating, wherein the step is the same as the step three in the embodiment;
Example 3
The embodiment is basically the same as the first embodiment, and compared with the first embodiment, the method for adding the modified nano boron carbide (B 4 C) as the functional filler comprises the following steps:
step one, surface modification of nano boron carbide, wherein the step one is the same as the step one of the embodiment one;
step two, preparation of polytetrafluoroethylene self-lubricating composite coating
2.1 Firstly, preparing polytetrafluoroethylene composite solution: 11g of Polytetrafluoroethylene (PTFE), 4g of aluminum dihydrogen phosphate (AP), 2g of Polyamideimide (PAI) 1g of deionized water and 2g of aluminum oxide (Al 2O3) are added in sequence.
2.2 To the polytetrafluoroethylene composite solution was added 0.8g of modified nano boron carbide (B 4 C), and 0.2g of an antifoaming agent.
2.3 Mixing: stirring for 3 hours by using a magnetic stirrer, and performing ultrasonic dispersion for 5 minutes every 30 minutes to obtain the polytetrafluoroethylene self-lubricating composite coating.
Step three, preparing a polytetrafluoroethylene self-lubricating composite coating, wherein the step is the same as the step three in the embodiment;
Examples
Compared with the first embodiment, the embodiment only adds molybdenum disulfide (MoS 2) as a functional filler, and comprises the following steps:
step one, preparation of polytetrafluoroethylene self-lubricating composite coating
1.1 Firstly, preparing polytetrafluoroethylene composite solution: 11g of Polytetrafluoroethylene (PTFE), 4g of aluminum dihydrogen phosphate (AP), 2g of Polyamideimide (PAI) 1g of deionized water and 2g of aluminum oxide (Al 2O3) are added in sequence.
1.2 To the polytetrafluoroethylene composite solution was added 1.2g of molybdenum disulfide (MoS 2) and 0.2g of an antifoaming agent in this order.
1.3 Mixing: stirring for 3 hours by using a magnetic stirrer, and performing ultrasonic dispersion for 5 minutes every 30 minutes to obtain the polytetrafluoroethylene self-lubricating composite coating
Step two, preparing a polytetrafluoroethylene self-lubricating composite coating, wherein the step is the same as the step three of the embodiment one;
Example 4
Compared with the first embodiment, the embodiment does not add functional filler, and comprises the following steps:
Step one, preparing a polytetrafluoroethylene self-lubricating composite coating, wherein the step is the same as the step two of the embodiment one;
step two, preparing a polytetrafluoroethylene self-lubricating composite coating, wherein the step is the same as the step three of the embodiment one;
Example 5
In this embodiment, compared with the first embodiment, only aluminum dihydrogen phosphate is used as the binder, and the method comprises the following steps:
step one, surface modification of nano boron carbide, wherein the step one is the same as the step one of the embodiment one;
step two, preparation of polytetrafluoroethylene self-lubricating composite coating
2.1 Firstly, preparing polytetrafluoroethylene composite solution: 11g of Polytetrafluoroethylene (PTFE), 6g of aluminum dihydrogen phosphate (AP), 1g of deionized water and 2g of aluminum oxide (Al 2O3) were added in this order.
2.2 To the polytetrafluoroethylene composite solution were added 0.8g of modified nano boron carbide (B 4 C) and 1.2g of molybdenum disulfide (MoS 2), and 0.2g of an antifoaming agent.
2.3 Mixing: stirring for 3 hours by using a magnetic stirrer, and performing ultrasonic dispersion for 5 minutes every 30 minutes to obtain the polytetrafluoroethylene self-lubricating composite coating.
Step three, preparing a polytetrafluoroethylene self-lubricating composite coating, wherein the step is the same as the step three in the embodiment;
the friction performance test was performed on the 6 groups of samples prepared in the above examples using an MDW-02G high-speed reciprocating frictional wear tester, the time of the friction test was designed to be 1 hour, the reciprocating stroke of each friction was 10mm, cr12mov was used as the friction pair, the size was 4.8mm by 12mm, and the friction pair was replaced after each test was completed, and the results are shown in Table 1.
TABLE 1 comparison of the Properties of the coatings of the preferred and comparative examples of the invention
As can be seen from the results of the table 1, the polytetrafluoroethylene self-lubricating composite coating provided by the invention has excellent lubricity, wear resistance and good stability, and the measurement results of coating adhesive force according to the national standard GT/T9286 (cross-hatch method) show that the coating adhesive force of all the examples is 0 level, so that the polytetrafluoroethylene self-lubricating composite coating provided by the invention has good adhesive force to a metal matrix, the preparation method has obvious advantages, and the polytetrafluoroethylene self-lubricating composite coating has wide application prospects in the field of mechanical antifriction.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the embodiments described above, and various changes, modifications, substitutions, combinations or simplifications made under the spirit and principles of the technical solution of the present invention can be made according to the purpose of the present invention, and all the changes, modifications, substitutions, combinations or simplifications should be equivalent to the substitution, so long as the purpose of the present invention is met, and all the changes are within the scope of the present invention without departing from the technical principles and the inventive concept of the present invention.
Claims (6)
1. A preparation method of a modified nano boron carbide/molybdenum disulfide reinforced polytetrafluoroethylene self-lubricating composite coating is characterized by comprising the following steps of: comprises the following steps of;
Step one, modifying the surface of nano boron carbide;
Washing nanometer boron carbide with absolute ethyl alcohol, soaking for 10min, filtering, drying and activating in a drying oven at 120 ℃ for 4 hours; nano boron carbide is prepared by the following steps of 1:10, adding the mixture into the prepared KH-560 solution, mechanically stirring for 20min to fully hydrolyze the mixture, adjusting the pH value to 4-6 by using acetic acid, reacting for 3h at 60 ℃, ultrasonically oscillating for 2min every 0.5h, filtering, washing the filtrate with absolute ethyl alcohol for several times until the pH value is neutral, and drying the filtrate at 60 ℃ for 24h; drying to obtain a target sample;
Preparing a polytetrafluoroethylene self-lubricating composite coating;
Mixing the prepared polytetrafluoroethylene composite solution, functional filler and auxiliary agent, stirring for 3 hours by using a magnetic stirrer, and performing ultrasonic dispersion for 5 minutes every 30 minutes to obtain polytetrafluoroethylene self-lubricating composite coating;
step three, preparing a polytetrafluoroethylene self-lubricating composite coating;
Uniformly spraying the prepared polytetrafluoroethylene self-lubricating composite coating on the surface of a metal substrate by using a spray gun, and then placing a sprayed sample in a muffle furnace for curing to obtain the polytetrafluoroethylene self-lubricating composite coating;
The polytetrafluoroethylene composite solution in the second step comprises 55wt% of polytetrafluoroethylene PTFE,20wt% of aluminum dihydrogen phosphate AP,10wt% of polyamide imide PAI,5wt% of deionized water and 10wt% of aluminum oxide Al 2O3;
The functional filler comprises modified nano boron carbide B 4 C and molybdenum disulfide MoS 2, and the adding proportion is polytetrafluoroethylene composite solution: modified nano boron carbide B 4 C is 100:6, polytetrafluoroethylene composite solution: molybdenum disulfide MoS 2 is 100:4, a step of;
the grain diameter of the nanometer boron carbide is 500nm; the particle size of the molybdenum disulfide is 100nm.
2. The method of manufacturing according to claim 1, characterized in that: the KH-560 solution in the first step comprises 1wt% of gamma-glycidoxypropyl trimethoxysilane KH-560, 90wt% of absolute ethanol and 9wt% of deionized water.
3. The method of manufacturing according to claim 1, characterized in that: step three, before the spraying, the surface pretreatment is carried out on the metal matrix; the pretreatment comprises degreasing, polishing to a surface roughness of 0.2-0.3 mu m, washing with acetone and drying.
4. The method of manufacturing according to claim 1, characterized in that: and thirdly, uniformly spraying the prepared polytetrafluoroethylene self-lubricating composite coating on the surface of the substrate by using a spray gun, wherein the spraying angle is 45 degrees, the spraying pressure is 0.20MPa, the distance from the spray gun to the substrate is 15-20 cm, and the thickness of the coating is controlled to be 25-40 mu m.
5. The method of manufacturing according to claim 1, characterized in that: step three, gradient solidification is carried out by using a muffle furnace, and the heating program is as follows: heating uniformly from room temperature to 50 ℃ for 20 minutes, and preserving heat for 20 minutes; heating to 120 ℃ uniformly for 20 minutes, and preserving heat for 20 minutes; heating to 380 ℃ uniformly for 20 minutes, and preserving heat for 20 minutes; and finally cooling to room temperature along with the furnace.
6. The modified nano boron carbide/molybdenum disulfide reinforced polytetrafluoroethylene self-lubricating composite coating prepared by the preparation method according to any one of claims 1 to 5.
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