CN115851115A - Water-based polyamideimide coating, water-based polyamideimide solid lubricating coating and application thereof - Google Patents
Water-based polyamideimide coating, water-based polyamideimide solid lubricating coating and application thereof Download PDFInfo
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Abstract
The invention provides a water-based polyamide-imide coating, a water-based polyamide-imide solid lubricating coating and application thereof, and relates to the technical field of functional wear resistance and corrosion resistance. The water-based polyamide-imide coating provided by the invention comprises water-based polyamide-imide resin, a lubricating phase, an anti-wear phase, an auxiliary agent and water. According to the invention, the water-based polyamide-imide resin is used as a bonding agent, polytetrafluoroethylene and molybdenum disulfide are used as lubricating phases, aluminum oxide and silicon nitride are used as wear-resistant phases, water is used as a solvent, and an auxiliary agent is used in a matching manner, so that the coating has low friction coefficient, excellent wear resistance and bearing performance, good medium-high temperature resistance and storage stability, a coating formed by curing the coating has excellent physical and chemical properties and antifriction and wear resistance, the wear resistance of the coating can be improved while the low friction coefficient of the coating is realized, the application range of polyamide-imide can be further widened when the coating is used as a wear-resistant antifriction coating on the surface of a moving part, and good application prospects are shown.
Description
Technical Field
The invention relates to the technical field of functionalized wear-resistant anticorrosion, and particularly relates to a water-based polyamideimide coating, a water-based polyamideimide solid lubricating coating and application thereof.
Background
With the application of advanced technologies such as miniaturization, direct injection in a cylinder, turbine increase and the like of an automobile engine, the performance of the engine is obviously improved, but the operating environment of the engine is obviously poor. The typical piston materials mainly comprise light alloy, cast iron, nodular cast iron, alloy steel and the like, the piston is used as an important part of an engine and mainly comprises a head part, a skirt part and a pin boss, and due to the unique structure and high surface roughness, the piston reciprocates at high speed in a cylinder body and simultaneously bears high-temperature ablation generated by gasoline combustion and explosion in the cylinder body, so that the piston skirt part is extremely easy to wear, and the service life of the engine is shortened. The service duration of the motor vehicle is prolonged, fossil energy consumption in the service period is saved, and the method is commonly pursued by enterprises and scientific research personnel.
Polymeric solid lubricating materials have been increasingly emphasized as the main type of solid lubricating coating, and polymeric coatings have become an important research topic in the field of tribology. Polyamide-imide (PAI) has both excellent properties of polyamide and polyimide, and is widely used in various fields because of its excellent wear resistance, heat resistance and self-lubricating function. In the military industry field, PAI mainly solves the lubrication problem under the special working condition of aerospace, and in the civil industry field, PAI gradually permeates into each branch and rises very quickly. Based on this, through at piston skirt surface coating wear-resisting antifriction coating, can effectively improve piston wear, prolong piston operating duration, and then prolong engine working life.
The existing solid self-lubricating materials mainly comprise high polymer materials (polytetrafluoroethylene, polyimide, polyamide-imide and the like), soft metals (Ag, cu and the like), non-metals (graphite) and metal salts (molybdenum disulfide, tungsten disulfide, calcium fluoride, barium fluoride and the like). For example, CN102363853A discloses a solid self-lubricating composite material comprising: 15wt% -30 wt% of nickel-chromium alloy, 40wt% -60 wt% of chromium carbide, 10wt% -20 wt% of tungsten disulfide and 10wt% -20 wt% of calcium fluoride, however, the solid self-lubricating composite material can form a wear-resistant self-lubricating coating on the surface of a substrate only through laser radiation, the laser cladding heat input is large, the thermal deformation of the substrate is serious, and the solid self-lubricating composite material is not suitable for parts with high dimensional accuracy and strict deformation control. Chinese patent CN103725069A discloses a solid self-lubricating coating, which comprises 20-35% by weight of fumaric acid bisphenol A resin, 20-35% by weight of styrene, 0.1-0.5% by weight of dicumyl peroxide, 15-30% by weight of glass fiber, 15-25% by weight of PTFE and 1.5-3.5% by weight of graphite, and the friction coefficient of the coating is 0.13-0.14. However, the self-lubricating coating has a high friction coefficient and poor wear resistance.
Disclosure of Invention
In view of the above, the present invention aims to provide a water-based polyamideimide coating, a water-based polyamideimide solid lubricating coating and applications thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a water-based polyamide-imide coating which comprises the following preparation raw materials in parts by mass: 20 to 35 portions of water-based polyamide-imide resin, 3 to 11 portions of lubricating phase, 2 to 10 portions of wear-resistant phase, 1.3 to 5.5 portions of auxiliary agent and 50 to 70 portions of water;
the lubricating phase comprises molybdenum disulfide and polytetrafluoroethylene;
the wear resistant phase includes aluminum oxide and silicon nitride.
Preferably, the aqueous polyamideimide resin is used in the form of an aqueous polyamideimide resin solution.
Preferably, the solid content of the aqueous polyamideimide resin solution is 20 to 30 wt.%.
Preferably, the mass ratio of molybdenum disulfide to polytetrafluoroethylene in the lubricating phase is 1-5: 2 to 6.
Preferably, the mass ratio of the alumina to the silicon nitride in the wear-resistant phase is 1-5: 1 to 5.
Preferably, the adjuvants include aqueous wetting dispersants, aqueous defoamers, and aqueous film-forming adjuvants.
Preferably, the aqueous coalescent includes an alcohol ester of twelve and/or twelve carbon alcohols.
Preferably, the mass ratio of the aqueous wetting dispersant to the aqueous defoaming agent to the aqueous film-forming assistant is 0.5-2: 0.5 to 2:0.3 to 1.5.
The invention provides a water-based polyamide-imide solid lubricating coating which is obtained by curing the water-based polyamide-imide coating in the technical scheme; the curing comprises a first curing and a second curing, wherein the temperature of the first curing is 60-80 ℃, and the time is 0.5-2 h; the temperature of the second curing is 250-270 ℃, and the time is 0.5-2 h.
The invention also provides application of the water-based polyamideimide coating or the water-based polyamideimide solid lubricating coating in the technical scheme in moving parts, household appliances, cooking kitchenware, surgical instruments or piston rings.
The invention provides a water-based polyamide-imide coating which comprises the following preparation raw materials in parts by mass: 20-35 parts of water-based polyamide-imide resin, 3-11 parts of lubricating phase, 2-10 parts of antiwear phase, 1.3-5.5 parts of auxiliary agent and 50-70 parts of water; the lubricating phase comprises molybdenum disulfide and polytetrafluoroethylene; the wear resistant phase includes aluminum oxide and silicon nitride. The invention takes the water-based polyamide-imide resin with excellent mechanical strength and toughness as the adhesive, can improve the adhesive strength, medium-high temperature resistance, mechanical strength and toughness of a solid lubricating coating formed by the water-based polyamide-imide coating, and has good adhesiveness on the surface of a metal substrate; molybdenum disulfide and polytetrafluoroethylene are used as compound lubricating phases and have good matching property with water-based polyamide-imide resin, so that the coating is not agglomerated, the coating has extremely low friction coefficient, and meanwhile, the two lubricating phases have good synergistic effect, so that the coating has excellent antifriction performance; the aluminum oxide and the silicon nitride are used as anti-wear phases, have good matching property with the water-based polyamide-imide resin under the action of the auxiliary agent, and have good synergistic effect at the same time, so that the anti-wear performance of the coating is improved; and water is used as a solvent, so that the environment is protected. The water-based polyamide-imide coating provided by the invention has good adhesion with a metal substrate, good impact resistance, low friction coefficient, bearing and wear resistance, excellent high temperature resistance and storage stability, and excellent comprehensive performance, and can be used as a coating of a moving part (such as a shaft, a roller, a piston skirt part and the like) to remarkably improve the wear-reducing and wear-resisting properties of the moving part under dry friction. Moreover, the coating provided by the invention can be coated on the surface of a substrate to form a coating after being cured, does not need laser radiation, does not cause thermal deformation of the substrate, is suitable for being used as a coating for parts with higher dimensional accuracy and stricter deformation control, and is also suitable for being used as a coating for household appliances, cooking utensils, surgical instruments or piston rings.
The invention provides a water-based polyamide-imide solid lubricating coating which is obtained by curing the water-based polyamide-imide coating in the technical scheme; the curing comprises a first curing and a second curing, wherein the temperature of the first curing is 60-80 ℃, and the time is 0.5-2 h; the temperature of the second curing is 250-270 ℃, and the time is 0.5-2 h. The water-based polyamideimide coating adopted by the invention has high bonding strength and hardness, low friction coefficient, and excellent corrosion resistance, wear resistance, bearing performance, high temperature resistance, flexibility, impact strength, lubricity, film forming property and chemical stability, and the water-based polyamideimide solid lubricating coating formed by curing the coating has excellent physicochemical property and antifriction wear resistance, particularly has good adhesion on the surface of a metal substrate, and excellent impact resistance, bearing capacity, wear resistance, storage stability and high temperature resistance, improves the wear resistance of the coating while realizing low friction coefficient of the coating, has application potential as a wear-resistant antifriction coating on the surface of a moving part, further widens the application range of the polyamideimide, and shows good application prospect.
As shown in the test results of the examples, the waterborne polyamideimide solid lubricating coating provided by the invention has the advantages of 1 grade of adhesive force, 1 grade of flexibility, impact resistance of more than or equal to 50 kg-cm, hardness of more than or equal to 8H, room-temperature friction coefficient of less than or equal to 0.08, high-temperature (200 ℃) friction coefficient of less than or equal to 0.09, wear-resistant service life of more than or equal to 24 hours and storage stability of more than 1 year.
Drawings
FIG. 1 is an appearance view of a water-based polyamideimide solid lubricating coating formed from the coating of comparative example 1;
FIG. 2 is an appearance diagram of a water-based polyamideimide solid lubricating coating formed by the coating material of comparative example 2;
FIG. 3 is a graph showing the results of an impact resistance test of a water-based polyamideimide solid lubricating coating formed from the dope of example 1;
FIG. 4 is a graph showing the results of a flexibility test of a water-based polyamideimide solid lubricating coating formed from the coating of example 1.
Detailed Description
The invention provides a water-based polyamide-imide coating which comprises the following preparation raw materials in parts by mass: 20-35 parts of water-based polyamide-imide resin, 3-11 parts of lubricating phase, 2-10 parts of antiwear phase, 1.3-5.5 parts of auxiliary agent and 50-70 parts of water;
the lubricating phase comprises molybdenum disulfide and polytetrafluoroethylene;
the wear resistant phase includes aluminum oxide and silicon nitride.
In the present invention, all the raw material components are commercially available products well known to those skilled in the art unless otherwise specified.
The preparation raw material of the water-based polyamide-imide coating comprises, by mass, 20-35 parts of water-based polyamide-imide resin, preferably 22-32 parts of water-based polyamide-imide resin, and more preferably 25-30 parts of water-based polyamide-imide resin. In the present invention, the solid content of the aqueous polyamideimide resin is preferably 20 to 30% by weight, more preferably 25% by weight; the viscosity of the aqueous polyamide-imide resin is preferably 2000 to 4000cps, more preferably 3000cps; in the specific embodiment of the present invention, the waterborne polyamide imide resin is preferably obtained from quark technologies, ltd, shenzhen.
The preparation raw material of the water-based polyamide-imide coating comprises, by mass, 3-11 parts of a lubricating phase, preferably 5-11 parts, and more preferably 7-9 parts; the lubricating phase comprises molybdenum disulfide and Polytetrafluoroethylene (PTFE), and the mass ratio of the molybdenum disulfide to the PTFE is preferably 1-5: 2 to 6, more preferably 1 to 5:3 to 6, more preferably 2 to 5:4 to 6. In the present invention, the purity of the molybdenum disulfide is preferably > 98%, and the particle size of the molybdenum disulfide is preferably 0.2 to 1 μm, more preferably 0.4 to 0.8 μm. In the present invention, the purity of the polytetrafluoroethylene is preferably > 98%, and the particle size of the polytetrafluoroethylene is preferably <5 μm.
The preparation raw material of the water-based polyamide imide coating comprises, by mass, 2-10 parts of an antiwear phase, preferably 3-9 parts, and more preferably 4-8 parts. In the present invention, the anti-wear phase comprises aluminum oxide (Al) and silicon nitride 2 O 3 ) And silicon nitride (Si) 3 N 4 ) The mass ratio of (b) is preferably 1 to 5:1 to 5, more preferably 2 to 4:2 to 4. In the present invention, the purity of the alumina is preferably > 98%, and the particle size of the polytetrafluoroethylene is preferably 0.02 to 0.03. Mu.m. In the present invention, the purity of the silicon nitride is preferably > 98%, and the particle size of the polytetrafluoroethylene is preferably 0.3 to 1 μm.
The preparation raw material of the water-based polyamide-imide coating comprises, by mass, 1.3-5.5 parts of an auxiliary agent, preferably 1.5-5 parts, and more preferably 2-4 parts. In the present invention, the auxiliary preferably includes an aqueous wetting dispersant, an aqueous defoaming agent and an aqueous film-forming auxiliary; the mass ratio of the water-based wetting dispersant to the water-based defoamer to the water-based film-forming assistant is preferably 0.5-2: 0.5 to 2:0.3 to 1.5, more preferably 0.6 to 1.5:0.6 to 1.5:0.4 to 1.2, more preferably 0.7 to 1:0.7 to 1:0.5 to 1. In the present invention, the aqueous wetting and dispersing agent is preferably an aqueous wetting and dispersing agent 731A; according to the invention, 731A is used as a wetting dispersant, and the 731A does not contain formaldehyde, has strong universality, good dispersibility and stability and short dispersion time, and can improve the corrosion resistance of the coating and the coating. In the present invention, the aqueous defoamer preferably comprises a defoamer BYK024 (whose main component is a mixture of organic non-silicon polypropylene-based polyether dispersions); the defoaming agent adopted by the invention can effectively inhibit the generation of bubbles. In the present invention, the aqueous coalescent preferably comprises an alcohol ester of dodecyl and/or dodecyl carbon alcohols, more preferably an alcohol ester of dodecyl or dodecyl carbon alcohols; the water-based film-forming additive adopted by the invention has the advantages of good compatibility with adhesives, small using amount, low film-forming temperature, good film leveling property, good hydrolytic stability, low toxicity and the like, and can obviously inhibit the generation of bubbles in the curing process of the coating.
The preparation raw material of the water-based polyamide-imide coating comprises, by mass, 50-70 parts of water, preferably 52-68 parts of water, and more preferably 55-65 parts of water.
In the invention, the water-based polyamide imide coating preferably comprises the following preparation raw materials in parts by mass: 20 to 35 portions of water-based polyamide-imide resin, 1 to 5 portions of molybdenum disulfide, 2 to 6 portions of PTFE (polytetrafluoroethylene), 1 to 5 portions of alumina, 1 to 5 portions of silicon nitride, 0.5 to 2 portions of water-based wetting dispersant, 0.5 to 2 portions of water-based defoaming agent, 0.3 to 1.5 portions of water-based film-forming assistant and 50 to 70 portions of water.
In the present invention, the method for preparing the aqueous polyamideimide coating preferably includes the steps of: mixing the water-based polyamide-imide resin, the lubricating phase, the antiwear phase, the auxiliary agent and water to obtain the water-based polyamide-imide coating. In the present invention, the temperature of the mixing is preferably room temperature; the mixing preferably comprises stirring, mixing and grinding in sequence, the speed and time of stirring and mixing are not particularly limited, and the raw materials can be uniformly mixed; the time for grinding and mixing is preferably 8 to 12 hours, more preferably 9 to 11 hours, and further preferably 10 hours; the milling and mixing is preferably carried out in a ball mill pot.
The invention provides a water-based polyamide-imide solid lubricating coating which is obtained by curing the water-based polyamide-imide coating in the technical scheme; the curing comprises a first curing and a second curing, wherein the temperature of the first curing is 60-80 ℃, preferably 65-75 ℃, and more preferably 70 ℃; the first curing time is 0.5 to 2 hours, preferably 1 to 1.5 hours; the temperature of the second curing is 250-270 ℃, preferably 255-265 ℃, and more preferably 260 ℃; the second curing time is 0.5 to 2 hours, preferably 1 to 1.5 hours.
In the present invention, the method for preparing the water-based polyamideimide solid lubricating coating preferably comprises the steps of: and (3) coating the water-based polyamide imide on the surface of the substrate and then curing to form the water-based polyamide imide solid lubricating coating on the surface of the substrate. In the present invention, the substrate preferably includes a metal substrate, and a material of the metal substrate preferably includes a nickel-copper alloy. In the present invention, the substrate is preferably subjected to a surface roughening treatment before use to obtain a surface roughened substrate; the surface roughening treatment preferably comprises sand blasting, and the blasting material of the sand blasting preferably comprises brown corundum and/or quartz sand; the sand blasting is preferably carried out by a sand blasting machine, and the working pressure of the sand blasting machine is preferably 0.3-0.5 MPa, and more preferably 0.4MPa; the invention carries out surface roughening treatment on the substrate, and can improve the bonding strength between the coating and the substrate. In the present invention, the coating preferably includes spraying, the spraying is preferably performed under compressed air or compressed nitrogen, and the spraying is preferably performed using a spray gun. After the coating, the invention preferably further comprises surface drying the obtained wet film, wherein the surface drying temperature is preferably room temperature, and the surface drying time is preferably 1-2 h, more preferably 1-1.5 h; the surface drying is preferably carried out under an air atmosphere. In the present invention, the curing conditions are preferably the same as those of the above curing, and are not described herein again. After the curing, the invention preferably further comprises cooling the obtained cured coating to room temperature to obtain the water-based polyamide imide solid lubricating coating; the cooling method of the present invention is not particularly limited, and may be any cooling method known to those skilled in the art, specifically, natural cooling.
The invention provides application of the water-based polyamideimide coating or the water-based polyamideimide solid lubricating coating in the technical scheme in moving parts, household appliances, cooking kitchenware, surgical instruments or piston rings. In the present invention, the moving part preferably comprises a shaft, a roller or a piston, preferably as a piston skirt coating when used with the piston. The water-based polyamide-imide coating and the water-based polyamide-imide solid lubricating coating provided by the invention have the advantages of good adhesive force on a metal substrate, good impact resistance, low friction coefficient, bearing and wear resistance, and excellent high temperature resistance, and can be used for a long time in a medium-high temperature (100-350 ℃) environment.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The preparation raw materials of the water-based polyamide-imide coating comprise: 25 parts of water-based polyamide-imide resin, 1 part of molybdenum disulfide, 4 parts of PTFE (polytetrafluoroethylene), and Al 2 O 3 2 parts of Si 3 N 4 2 parts of water-based wetting dispersant 731A 0.7 part, foaming agent 2040.8 part, film-forming assistant alcohol ester twelve 0.5 part and deionized water 64 parts.
And uniformly mixing the prepared raw materials, transferring the mixture into a ball milling tank, and grinding and mixing the mixture for 10 hours at room temperature to obtain the water-based polyamide-imide coating.
Example 2
The preparation raw materials of the water-based polyamide-imide coating comprise: 25 parts of water-based polyamide-imide resin, 3 parts of molybdenum disulfide, 4 parts of PTFE (polytetrafluoroethylene), and Al 2 O 3 2 parts of Si 3 N 4 2 parts of water-based wetting dispersant 731A 0.7 part, defoaming agent BYK0240.8 part, film-forming additive alcohol ester twelve 0.5 part and deionized water 62 parts. Uniformly mixing, putting into a ball milling tank for grinding, and grinding for 10 hours to obtain the coating.
And uniformly mixing the prepared raw materials, transferring the mixture into a ball milling tank, and grinding and mixing the mixture for 10 hours at room temperature to obtain the water-based polyamide-imide coating.
Example 3
The preparation raw materials of the water-based polyamide-imide coating comprise: 25 parts of water-based polyamide-imide resin, 5 parts of molybdenum disulfide, 4 parts of PTFE (polytetrafluoroethylene), and Al 2 O 3 2 parts of Si 3 N 4 2 parts of water-based wetting dispersant 731A 0.7 part, defoaming agent BYK0240.8 part, film-forming additive alcohol ester twelve 0.5 part and deionized water 60 parts. Uniformly mixing, putting into a ball milling tank for grinding, and grinding for 10 hours to obtain the coating.
And uniformly mixing the prepared raw materials, transferring the mixture into a ball milling tank, and grinding and mixing the mixture for 10 hours at room temperature to obtain the water-based polyamide-imide coating.
Example 4
The preparation raw materials of the water-based polyamide-imide coating comprise: 25 parts of water-based polyamide-imide resin, 5 parts of molybdenum disulfide, 6 parts of PTFE (polytetrafluoroethylene), and Al 2 O 3 2 parts of Si 3 N 4 2 parts of water-based wetting dispersant 731A 0.7 part, defoaming agent BYK0240.8 part, film-forming additive alcohol ester twelve 0.5 part and deionized water 58 parts. Uniformly mixing, putting into a ball milling tank for grinding, and grinding for 10 hours to obtain the coating.
And uniformly mixing the prepared raw materials, transferring the mixture into a ball milling tank, and grinding and mixing the mixture for 10 hours at room temperature to obtain the water-based polyamide-imide coating.
Example 5
The preparation raw materials of the water-based polyamide-imide coating comprise: 25 parts of water-based polyamide-imide resin, 4 parts of molybdenum disulfide, 5 parts of PTFE (polytetrafluoroethylene), and Al 2 O 3 4 parts of Si 3 N 4 4 parts of water-based wetting dispersant 731A 0.7 part, defoaming agent BYK0240.8 part, film-forming additive alcohol ester twelve 0.5 part and deionized water 56 parts. Uniformly mixing, putting into a ball milling tank for grinding, and grinding for 10 hours to obtain the coating.
And uniformly mixing the prepared raw materials, transferring the mixture into a ball milling tank, and grinding and mixing for 10 hours at room temperature to obtain the water-based polyamide-imide coating.
Example 6
The preparation raw materials of the water-based polyamide-imide coating comprise: 30 parts of water-based polyamide-imide resin, 3 parts of molybdenum disulfide, 4 parts of PTFE (polytetrafluoroethylene), and Al 2 O 3 3 parts of Si 3 N 4 3 parts of water-based wetting dispersant 731A 0.7 part, defoaming agent BYK0240.8 part, film-forming additive alcohol ester twelve 0.5 part and deionized water 55 parts. Uniformly mixing, putting into a ball milling tank for grinding, and grinding for 10 hours to obtain the coating.
And uniformly mixing the prepared raw materials, transferring the mixture into a ball milling tank, and grinding and mixing the mixture for 10 hours at room temperature to obtain the water-based polyamide-imide coating.
Comparative example 1
The preparation raw materials of the water-based polyamide-imide coating comprise: 25 parts of water-based polyamide-imide resin, 1 part of molybdenum disulfide, 4 parts of PTFE (polytetrafluoroethylene), and Al 2 O 3 3 parts of Si 3 N 4 3 parts and 64 parts of deionized water. Uniformly mixing, putting into a ball milling tank for grinding, and grinding for 10 hours to obtain the coating.
And uniformly mixing the prepared raw materials, transferring the mixture into a ball milling tank, and grinding and mixing the mixture for 10 hours at room temperature to obtain the water-based polyamide-imide coating.
Comparative example 2
The preparation raw materials of the water-based polyamide-imide coating comprise: 25 parts of water-based polyamide-imide resin, 1 part of molybdenum disulfide, 4 parts of PTFE (polytetrafluoroethylene), and Al 2 O 3 2.5 parts of Si 3 N 4 2 parts, 0.7 part of aqueous wetting dispersant 731A, 0.8 part of defoaming agent BYK0240 and 64 parts of deionized water.
And uniformly mixing the prepared raw materials, transferring the mixture into a ball milling tank, and grinding and mixing the mixture for 10 hours at room temperature to obtain the water-based polyamide-imide coating.
Test example 1
Carrying out sand blasting on the nickel-copper alloy substrate to obtain a surface roughened substrate; the water-based polyamide-imide coating prepared in the embodiments 1-6 and the comparative examples 1-2 is uniformly sprayed on the surface of a roughened substrate under the condition of compressed air (no water or oil) or compressed nitrogen, surface-dried for 1h under the condition of air and room temperature, placed in an oven, insulated and cured for 1h under the condition of 70 ℃, insulated and cured for 2h under the condition of 260 ℃, and cooled to room temperature to obtain the water-based polyamide-imide coating.
The coatings prepared in examples 1 to 6 and comparative examples 1 to 2 formed an aqueous polyamideimide solid lubricating coating with an appearance (visual inspection): dark gray, smooth, crack-free, pinhole-free, bubble-free (where the coating color can be changed by adding appropriate proportions of pigments and fillers without changing the basic properties of the coating).
FIG. 1 is an external view of a water-based polyamideimide solid lubricating coating formed from the coating material of comparative example 1, and it can be seen from FIG. 1 that the water-based polyamideimide solid lubricating coating is seriously suffering from a chipping.
FIG. 2 is an external view of a water-based polyamideimide solid lubricating coating formed from the coating of comparative example 2, and it can be seen from FIG. 2 that the foaming phenomenon of the water-based polyamideimide solid lubricating coating is severe.
The performance indexes and performance test results of the coatings formed from the paints prepared in examples 1 to 6 are shown in table 1 and fig. 3 to 4, in which fig. 3 is a graph showing the results of the impact resistance test of the aqueous polyamideimide solid lubricating coating formed from the paint of example 1, and fig. 4 is a graph showing the results of the flexibility test of the aqueous polyamideimide solid lubricating coating formed from the paint of example 1.
TABLE 1 Performance test results for waterborne polyamideimide solid lubricant coatings
As can be seen from Table 1 and FIGS. 1 to 4, the waterborne polyamideimide coating and the waterborne polyamideimide solid lubrication coating provided by the invention have good adhesion on the surface of a metal substrate, good impact resistance, low friction coefficient, excellent bearing capacity, wear resistance and medium-high temperature resistance, and can be used for a long time in medium-high temperature (100-350 ℃) environments.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.
Claims (10)
1. The water-based polyamide-imide coating is characterized by comprising the following preparation raw materials in parts by mass: 20-35 parts of water-based polyamide-imide resin, 3-11 parts of lubricating phase, 2-10 parts of antiwear phase, 1.3-5.5 parts of auxiliary agent and 50-70 parts of water;
the lubricating phase comprises molybdenum disulfide and polytetrafluoroethylene;
the wear resistant phase includes aluminum oxide and silicon nitride.
2. The self-lubricating wear-resistant paint with rapid response according to claim 1, wherein the water-based polyamideimide resin is used in the form of a water-based polyamideimide resin solution.
3. The self-lubricating wear-resistant paint with quick response according to claim 2, wherein the solid content of the water-based polyamide-imide resin solution is 20-30 wt%.
4. The water-based polyamideimide coating according to claim 1, wherein the mass ratio of molybdenum disulfide to polytetrafluoroethylene in the lubricating phase is 1 to 5:2 to 6.
5. The water-based polyamideimide coating according to claim 1, wherein the mass ratio of aluminum oxide to silicon nitride in the anti-wear phase is 1 to 5:1 to 5.
6. The aqueous polyamideimide coating of claim 1 wherein the adjuvants include aqueous wetting dispersants, aqueous defoamers, and aqueous film forming aids.
7. The aqueous polyamideimide coating of claim 6 wherein the aqueous coalescent includes an alcohol ester of twelve and/or twelve carbon alcohols.
8. The water-based polyamideimide coating material according to claim 6 or 7, wherein the mass ratio of the water-based wetting dispersant, the water-based defoaming agent and the water-based film forming aid is 0.5 to 2:0.5 to 2:0.3 to 1.5.
9. A water-based polyamideimide solid lubricating coating obtained by curing the water-based polyamideimide coating according to any one of claims 1 to 8; the curing comprises a first curing and a second curing, wherein the temperature of the first curing is 60-80 ℃, and the time is 0.5-2 h; the temperature of the second curing is 250-270 ℃, and the time is 0.5-2 h.
10. Use of the aqueous polyamideimide coating according to any one of claims 1 to 8 or the aqueous polyamideimide solid lubricant coating according to claim 9 in moving parts, home appliances, cooking utensils, surgical instruments or piston rings.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101768500A (en) * | 2009-12-30 | 2010-07-07 | 山东久隆高分子材料有限公司 | Water-based solid lubricant |
| CN102286248A (en) * | 2011-07-08 | 2011-12-21 | 华南理工大学 | Polyimide-based self-lubricating abrasion-resistant coating material and preparation method thereof |
| CN106189819A (en) * | 2016-07-26 | 2016-12-07 | 中国科学院兰州化学物理研究所 | A kind of environment-friendly water-based molybdenum-disulfide radical bonded solid lubricant coating and its preparation method and application |
| CN108424720A (en) * | 2018-04-26 | 2018-08-21 | 中国科学院兰州化学物理研究所 | A kind of preparation of aqueous PTFE base bonded solid lubricant coating and coating |
| CN113956785A (en) * | 2021-09-23 | 2022-01-21 | 江苏高润新材料有限公司 | Environment-friendly solid lubricating coating and preparation and use method thereof |
-
2022
- 2022-11-23 CN CN202211470389.7A patent/CN115851115A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101768500A (en) * | 2009-12-30 | 2010-07-07 | 山东久隆高分子材料有限公司 | Water-based solid lubricant |
| CN102286248A (en) * | 2011-07-08 | 2011-12-21 | 华南理工大学 | Polyimide-based self-lubricating abrasion-resistant coating material and preparation method thereof |
| CN106189819A (en) * | 2016-07-26 | 2016-12-07 | 中国科学院兰州化学物理研究所 | A kind of environment-friendly water-based molybdenum-disulfide radical bonded solid lubricant coating and its preparation method and application |
| CN108424720A (en) * | 2018-04-26 | 2018-08-21 | 中国科学院兰州化学物理研究所 | A kind of preparation of aqueous PTFE base bonded solid lubricant coating and coating |
| CN113956785A (en) * | 2021-09-23 | 2022-01-21 | 江苏高润新材料有限公司 | Environment-friendly solid lubricating coating and preparation and use method thereof |
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