KR101771660B1 - sliding member sliding damper coating method using the coating composition and this - Google Patents

Abstract

The present invention relates to a coating composition for sliding parts and a sliding member coating method using the same.
A coating slurry composition for a lubricant member in which PAI (polyamide imide), PTFE, carbon fiber, graphene powder, Tetrapod ZnO, silane coupling agent, organic solvent, antifoaming agent and dispersant are mixed at a certain ratio by weight ratio A method for preparing a coating slurry for a sliding part, comprising the steps of: adjusting the viscosity of a coating slurry composition for a lubricating member to a range of 30 to 40 cP; placing the slurry composition in a cylindrical container of plastic or ceramic product for 1 to 2 hours at room temperature; A step of preparing a coating slurry, a step of degreasing and washing the surface of the substrate roughly treated to a surface roughness of about 1 to 2 탆, and a step of spraying, rolling, brushing, offset and screen printing Coating the slidable member with a thickness of 0 to 30 μm, drying at 80 to 100 ° C. for 30 to 60 minutes, calcining at 200 to 250 ° C. for 1 to 2 hours, It includes the steps:

Description

[0001] The present invention relates to a coating composition for a sliding part and a sliding member sliding coating method using the same,

The present invention relates to a coating composition for sliding parts and a sliding member coating method using the same. More particularly, the present invention relates to a coating composition excellent in abrasion resistance and lubricity, a method of producing the composition and a method of coating the substrate, and more particularly, to a method of coating an iron (iron or iron alloy), an aluminum (aluminum or aluminum alloy), and a magnesium Magnesium alloy), which is excellent in abrasion resistance, resistance to seizure, heat resistance and lubricity, and a sliding member coating method using the same.

Recently, there have been increasing demands for regulation of exhaust gas of an internal combustion engine and improvement of fuel efficiency. In general, as measures for improving fuel efficiency, studies for reducing friction coefficient of a sliding member have been actively carried out in addition to weight reduction, .

Particularly, continuous research is being conducted on a swash plate of a swash plate air compressor, a cylinder bore of an internal combustion engine, and a sliding member that forms a resin coating film that imparts lubricity and wear resistance to a piston skirt.

For example, in Japanese Unexamined Patent Application Publication No. 8-199327 (Aug. 6, 1986), in order to prevent the swash plate and the shoe between the swash plate compressor and the shoe from sticking, a copper or aluminum material Tin plating, lead-tin plating, PTFE coating, MoS ₂ or MoS ₂ -graphite mixed layer is coated on the metal sprayed layer.

In addition, Japanese Patent Application Laid-Open No. 2002-089437 (Feb. 27, 2002) discloses that the formation of the sprayed layer has a drawback that the cost is increased or the flatness is lowered, and the solid lubricant containing PTFE is fixed to the thermosetting polyamideimide There has been proposed a method in which nickel plating is provided on the surface of a sliding shoe with respect to a swash plate having a sliding layer to increase the lubricity of the swash plate and shoe to prevent the sliding therebetween. Also, Japanese Patent Application Laid- ) Discloses a sliding member containing a polyamideimide resin as a binder resin, a solid lubricant and an organic solvent in an appropriate ratio.

Japanese Unexamined Patent Application Publication No. 2013-209960 (Oct. 10, 2013) discloses a method for preventing the solidification of the resin composition during the coating process of the lubricant film on the sliding member surface of the piston guide portion of the internal combustion engine, A sliding member using an N-ethyl-2-pyrrolidone as a solvent is proposed in which a polyamide imide resin having an average molecular weight adjusted to 10,000 to 50,000 in a coating composition for forming a lubricant film containing an organic solvent is proposed , There is no roundabout reference to other solid lubricants or other functional additives.

However, according to the above-mentioned patent documents, it is possible to provide a binder resin and a base material, a binder resin and a solid lubricant, a suitable type and selection of materials (wear resistance, anti-telephone, Coating method and the like are insufficient, so that more accurate data is required.

On the other hand, in the operation of coating the sliding member on the surface of the base material, the abrasion resistance of the lubricating member, the adhesiveness with the base material, and the like are affected by the composition ratio of the solid lubricant to the composition and the solid content depending on the kind of the organic solvent, , Heat resistance, durability, resistance to seizure and lubrication, and the like.

Accordingly, it is possible to provide a binder resin, a solid lubricant, a crosslinking agent, a coupling agent, a leveling agent, an abrasion resistant material, and an organic solvent in a sliding member composition for obtaining a uniform and thin coating layer according to the viscosity or dispersion characteristics of the coating composition And the amount of use thereof.

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Japanese Patent Application Laid-Open No. 8-199327 (Aug. 6, 1986) Japanese Unexamined Patent Application Publication No. 2002-089437 (March 27, 2002) Japanese Unexamined Patent Application Publication No. 2011-213761 (Oct. 27, 2011) Japanese Patent Application Laid-Open No. 2013-209960 (Oct. 10, 2013)

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances and provides a coating composition having excellent physical and chemical properties such as abrasion resistance, And a coating method for a substrate according to the composition ratio of the coating composition.

Also, the present invention provides a coating method in which a coating slurry for a sliding part is prepared and applied to a substrate with a predetermined coating thickness, heated under atmospheric pressure, dried, and fired to adjust the residual solvent amount of the coating layer to about 0.1% or less .

According to an embodiment of the present invention, a thermosetting resin such as polyamide imide and polyimide is used as the binder resin, and a solid lubricant includes PTFE, MoS ₂ , A carbon fiber, a graphene nanoplate powder, a functional additive T-ZnO powder, a silane coupling agent, a platinum divinyl tetramethyldisiloxane, a defoaming agent and a dispersant, and an organic solvent such as NMP, DMAC, MEK, Xylene, wherein the amount of the binder resin PAI (polyamide imide) is 30 to 55 wt%, the amount of the PTFE as a solid lubricant is 10 And 0.2 to 1.5 wt% of carbon fiber, 0.2 to 1.5 wt% of graphene powder, 0.2 to 1.5 wt% of tetrapod ZnO as a functional metal oxide, and 0.1 to 1.0 wt% of a silane coupling agent, , 10 to 22% by weight of NMP as an organic solvent, 10 to 15% by weight of any one of xylene and xylene, 2 to 6% by weight of DMAC and 2 to 6% by weight of MEK, Is added in an amount of 0.01 to 0.1% by weight.

According to an embodiment of the present invention, the coating slurry composition for a lubricant member is characterized in that the viscosity of the coating liquid composition is 30 to 40 cP.

According to an embodiment of the present invention, the particle size of the PTFE is 0.15-5.0 탆 and the MoS ₂ is 0.5-0.7 탆.

According to an embodiment of the present invention, the tetrapod ZnO has an average length of 10.0 탆 or less and a diameter of 50-100 nm.

According to an embodiment of the present invention, the carbon fiber has a diameter of 5 탆, a length of 10 탆 or less, and a graphene nanoplate powder of 50 to 500 nm.

According to one embodiment of the present invention, a polyamide imide (PAI), PTFE, carbon fiber, graphene powder, Tetrapod ZnO, silane coupling agent, organic solvent, antifoaming agent, (A) adjusting the viscosity of the coating slurry composition for the lubricating member to a range of 30 to 40 cP; and (c) adjusting the viscosity of the coating slurry composition to a range of 30 to 40 cP. (b) milling in a cylindrical container of plastic or ceramic product at room temperature for 1 to 2 hours to prepare a coating slurry; (c) degreasing and washing the surface of the substrate which has been roughly treated with the surface roughness of the coating slurry to about 1 to 2 탆; (d) coating the sliding member to a thickness of 0 to 30 mu m by any one of spraying, rolling, brushing, offset, and screen printing; (e) after completion of the step (d), drying at 80 to 100 ° C for 30 to 60 minutes; (f) after completion of the step (e), firing at 200 to 250 ° C for 1 to 2 hours, and then slowly cooling to room temperature.

According to the embodiment of the present invention, the coating slurry for a sliding part for surface coating of iron, aluminum and magnesium based materials can be suitably selected from the kinds and amounts of the binder resin, solid lubricant, organic solvent and other functional additives, It exhibits an effect of adversely affecting adhesion to the substrate surface, lubricity, abrasion resistance, etc. in the drying and firing process depending on the viscosity change.

Therefore, it can be used as a swash plate of a swash plate type air compressor, a cylinder bore of an internal combustion engine, and a lubricant at a piston skirt portion.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a table showing results of examining the composition ratios of the coating slurry composition for a sliding part according to an embodiment of the present invention and the lubricating properties of the surface of the coated substrate. FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The coating slurry composition of the present invention comprises a thermosetting binder resin, a solid lubricant, a functional additive, a silane coupling agent, a defoaming agent, and various kinds of organic solvents.

(PAI), polyimide (PI), epoxy resin, polyetherketone resin (PEEK), polyphenylene resin (PPS), or the like, which is a thermosetting and thermoplastic resin, can be used as the binder resin , PTFE as a solid lubricant, MoS ₂ , Graphite, carbon nanotubes, fullerene, carbon fiber, and graphene nanoplate powders are used as WS ₂ , h-BN (boron nitride), and carbon-based materials. Other functional additives include silicon carbide ((SiC), alumina Fine powder such as Al ₂ O ₃ , ZrO ₂ , TiO ₂ , CaF ₂ and tetrapod-ZnO can be used. melamine, C ₃ H ₆ N ₆ ), the silane coupling agent is aminophenyltrimethoxysilane, C ₉ H ₁₅ NO ₃ Si, aminoethylaminopropyl-N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, C ₈ H ₂₂ N ₂ O ₃ Si, triethoxypropylamine, C ₁₈ H ₄₃ NO ₆ Si ₂ , chromomethylphenylethyltrimethoxysilane chloromethyl) phenylethyltrimethoxysilane, C ₁₂ H ₁₉ ClO ₃ Si, Platinum di vinyltetramethyldisiloxane Pt (0) -1,3-divinyl-1,1,3,3-tetramethyldisiloxane can be used, and organic Sheets are pyrrolidone fatigue boiling point different methyl (NMP, N-methyl-2 -pyrrolidon, C 5 H 9 NO), di-methyl acetamide _{(DMAC, dimethylacetamide, C 4 H} 9 NO), methyl isobutyl ketone MIBK, methylisobutyl _{ketone, (CH 3) 2 CHCH} 2 C (O) CH 3, methyl ethyl ketone, _{MEK, methyl ethyl ketone, CH 3} C (O) OH 2 CH 3, gamma butyrolactone _{(GBL, -butylolacton, C 4 H} 6 O ₂ ), dimethylisosorbide (C ₈ H ₁₄ O ₄ ), xylene Xylene, C ₆ H ₄ (CH ₃ ) ₂ , and the like. In addition, a small amount of defoaming agent and dispersant may be added.

In particular, the present invention can be used for a polyamide-imide (PAI), or polyimide (PI) of a binder resin, a solid lubricant to the PTFE, MoS _2, a carbon-based material of carbon _fiber, graphene nano plate powder, teteurapodeu a functional additive Zinc oxide (Tetrapod-ZnO), silane coupling agent, platinum divinyltetramethyldisiloxane, and a small amount of antifoaming agent can be used. As the organic solvent, NMP, DMAC, MEK, and Xylene having different boiling points can be used. May be used to control the viscosity of the coating composition slurry.

The graphene nanoplate has excellent physical properties such as electrical conductivity, thermal conductivity, scratch resistance and abrasion resistance, corrosion resistance, and bio-stain resistance, and is used in aerospace, automobile, construction, ship and defense industries.

Tetrapod-ZnO, a functional additive, is a material that is excellent in electrification prevention, super water repellency, propagation and ultraviolet ray absorbing property, thermal conductivity, abrasion resistance, antibacterial property and adhesion force and is attracting attention as a filler material of a resin compound .

The composition ratio of the coating slurry composition for a lubricant of the present invention is 45 to 55% by weight of a binder resin, 10 to 15% by weight of a solid lubricant (PTFE, MoS ₂ , carbonaceous material), 30 to 35% by weight of an organic solvent, 0.1 to 0.7% by weight of a lubricant, 0.01 to 0.05% by weight of an antifoam agent, and a viscosity of 30 to 40 cP.

Further, the composition ratio of the coating slurry composition for the lubricant member is 40 to 55% by weight of PAI, 5 to 15% by weight of solid lubricant PTFE and 5 to 10% by weight of MoS ₂ , 10% by weight. 0.1 to 1.0% by weight of tetrapod ZnO ₂ , 0.1 to 1.0% by weight of a silane coupling agent, and an optimum amount of added is 0.5 to 1.0% by weight. In addition, about 0.01 to 0.1% by weight of a leveling agent and a defoaming agent may be added.

As the organic solvent, 10 to 22 wt% of NMP, 12 to 17 wt% of the most suitable amount, 9 to 15 wt% of xylene, 8 to 10 wt% of optimal amount, 2 to 6 wt% of DMAC and MEK, Is adjusted to 3 to 5% by weight so that the viscosity of the entire coating liquid composition is adjusted to be 30 to 40 cP.

That is, the optimum composition of the coating slurry for a sliding part of the present invention is 30 to 55 wt% of PAI as a binder resin, 10 to 25 wt% of a PTFE as a solid lubricant, 0.2 to 1.5% by weight of zinc oxide (Tetrapod ZnO), 0.1 to 1.0% by weight of a silane coupling agent, and 10 to 22% by weight of an organic solvent And 10 to 15% by weight of any one of xylene and xylene, 2 to 6% by weight of DMAC and 2 to 6% by weight of MEK, 0.01 to 0.1% by weight of a defoaming agent and a dispersant are added, And a viscosity of 30 to 40 cP.

When the composition ratio of the above-mentioned composition is insufficient or exceeds the above-mentioned range, the binder resin exhibits a decrease in adhesion with the base material and a decrease in performance of the lubricant or other additives.

In addition, in the case of the solid lubricant and the functional additive, the physical properties such as lubricity, heat resistance, and anti-seizure property of the coating layer may be deteriorated and cost problems due to excessive use may occur.

In the case of a solvent, it is necessary to adjust the viscosity of the coating slurry to an optimum level by appropriately adjusting a solvent having a different boiling point, so that the difference in the ratio of the solvent over and under and the mutual mixing ratio greatly affects the application of the coating slurry.

Here, the particle size of the solid lubricant PTFE is 0.15 to 5.0 mu m and the MoS ₂ is 0.5 to 0.7 mu m. The tetrapod ZnO has an average length of about 10.0 mu m or less, a diameter of 50 to 100 nm, 5 mu m, a length of 10 mu m or less, and a graphene nanoplate powder of 50 to 500 nm.

In addition, methods for making and coating coating slurries on substrates include but are not limited to binder resin PAI, solid lubricant PTFE, MoS ₂ , carbon fibers, graphene powder, tetrapod ZnO, a functional additive, A solvent including NMP (N-methyl pyrrolidone), xylene, xylene, DMAC (Dimethylacetamide), and MEK is mixed in the above ratio to adjust the viscosity of the slurry.

Then, it is put into a cylindrical container made of plastic or ceramic product and milled at room temperature for about 1 to 2 hours to prepare a coating slurry.

The surface of the substrate having rough surface roughness of the coating slurry of about 1 to 2 탆 is degreased and washed and then coated on the surface of the substrate by a known coating method such as spraying, rolling, brushing, offset and screen printing to a thickness of about 10 to 30 탆 And then dried at 80 to 100 ° C. for 30 to 60 minutes. When drying is completed, the coated substrate is baked at about 200 to 250 ° C. for 1 to 2 hours, and then slowly cooled to room temperature to perform a coating operation.

The pencil hardness of the coated surface after firing is about 4H.

FIG. 2 shows the results of examining examples of the kinds and composition ratios of the coating slurry compositions for sliding parts of the present invention and the lubrication characteristics of the surface of the coated substrates.

As a test for the lubrication characteristics, the lubrication characteristics are measured through the following test procedure.

The ML test is a wear durability test that measures the degree of resistance to abnormal conditions in which the lubricating oil is supplied to the swash plate under normal operating conditions.

This assumes that the worst possible conditions that may occur during use of the product are fulfilled and that the criteria should be maintained for at least 10 minutes in the no-lubrication state of the loads of 2,300rpm and 200kgf in step 6 in the seizure test ML standard table of Table 1 It is set to pass.

The RL test is an internal load test to determine how much load can be tolerated under abnormal loads due to external shocks or other factors under normal operating conditions. The seismic load test in Table 2, Step 1 To 3 is a normal operating condition, and in step 4, it is defined that the test is to pass the standard in order to withstand a load of 1,300 kgf or more from a 45 kgf load to a continuous load test while maintaining a normal operating condition (1000 rpm, lubricating oil supply condition) .

The friction coefficient was measured using a high-temperature reciprocating friction and abrasion tester (Cameron Plint, ASTM G133) at a test load of 20 kg / cm ² and a sliding speed of 0.14 m / sec (10 Hz). The temperature of the test piece was maintained at 150 캜 in consideration of the temperature rise of the actual substrate.

step Step-by-step test environment Cumulative time (seconds) rpm Load (kgf) Time (seconds) Lubricating oil supply One 100 45 30 ○ 30 2 1,300 45 60 ○ 60 3 1,300 200 90 ○ 150 4 1,300 200 480 ○ 630 5 2,300 200 150 ○ 780 6 2,300 200 1,200 x

[Table 1] Seizure test ML reference table

step Step-by-step test environment rpm Load (kgf) Time (seconds) Lubricating oil supply One 100 45 30 ○ 2 1,000 45 60 ○ 3 1,000 45 480 ○ 4 1,000 1850 1,200 ○

[Table 2] Seizure test RL reference table

As shown in FIG. 2, it can be seen that the conditions of Examples 1 to 10 pass all of the ML and RL test standards.

That is, it can be seen that all the test standards are satisfied within the range of the coating slurry composition in the range of 20 to 25% by weight of solid content of the lubricant coating slurry and the viscosity of 30 to 40 cP.

However, it can be seen that the composition ratio in which the kind of solid content (solid lubricant, functional material, etc.), the addition amount thereof, and the viscosity of the slurry composition are out of the above range, that is, the test specimen is not satisfied in the comparative example.

Therefore, the coating slurry composition for sliding parts for surface coating of iron-based, aluminum-based and magnesium-based substrates should be adjusted within a very narrow range of binder resin, solid lubricant, other additive and organic solvent, .

The abrasion-resistant lubricating coating composition for wetting according to the present invention is used for surface coating of iron-based, aluminum-based, magnesium-based and the like.

Surface treatment before coating is performed by surface sanding with alumina powder, then dusting the sanded metal surface with high-pressure drying air completely, and then performing the coating operation in a short period of time. In the coating operation, An atmosphere containing a slight inert gas in the atmosphere keeps the surface of the metal substrate in a clean state and improves the coating film adhesion performance.

In particular, the sanding surface of the metal surface is preferably 2 to 3 microns (mRz), and the coating film is preferably 17 mRz to 23 mRz, more preferably 20 mRz.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them.

It is also to be understood that the terms such as " comprises, "" comprising," or "having ", as used herein, mean that a component can be implanted unless specifically stated to the contrary. And all terms including technical and scientific terms are to be construed in a manner generally known to one of ordinary skill in the art to which this invention belongs, It has the same meaning as understood.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (6)

Polyamide imide, which is a thermosetting resin, is used as the binder resin, and solid lubricants such as PTFE, MoS ₂ , A coating slurry composition for a lubricating member using carbon fiber, graphene powder, T-ZnO powder as a functional additive, a silane coupling agent, a defoaming agent and a dispersant, and NMP, DMAC, MEK, and Xylene as organic solvents / RTI >
The coating slurry composition for the lubricating member
The addition amount of polyamide imide (PAI) as a binder resin is 30 to 55 wt%, the addition amount of PTFE as a solid lubricant is 5 to 15 wt%, the amount of MoS ₂ is (Tetrapod ZnO) of 0.2 to 1.5% by weight, and a silane coupling agent of 0.1 to 1.0% by weight, the carbon fiber is 0.5 to 2.0% by weight, the graphene powder is 0.2 to 1.5% , 10 to 22% by weight of NMP as an organic solvent, 10 to 15% by weight of any one of xylene and xylene, 2 to 6% by weight of DMAC and 2 to 6% by weight of MEK, 0.01 to 0.1% by weight based on the total weight of the lubricant.
The method according to claim 1,
Wherein the coating slurry composition for a lubricant member is configured such that the viscosity of the coating fluid composition is from 30 to 40 cP.
The method according to claim 1,
Wherein the PTFE has a particle size of 0.15 to 5.0 탆 and a MoS ₂ of 0.5 to 0.7 탆.
The method according to claim 1,
Wherein the tetrapod ZnO has an average length of 10.0 탆 or less and a diameter of 50 to 100 nm.
The method according to claim 1,
Wherein the carbon fiber has a diameter of 5 탆, a length of 10 탆 or less, and a graphene nanoplate powder of 50 to 500 nm.
A coating slurry composition for a lubricant member in which PAI (polyamide imide), PTFE, carbon fiber, graphene powder, Tetrapod ZnO, silane coupling agent, organic solvent, antifoaming agent and dispersant are mixed at a certain ratio by weight ratio A method for preparing and coating a coating slurry for a sliding part,
(a) adjusting the viscosity of the coating slurry composition for the lubricating member to a range of 30 to 40 cP;
(b) milling in a cylindrical container of plastic or ceramic product at room temperature for 1 to 2 hours to prepare a coating slurry;
(c) degreasing and washing the surface of the substrate which has been roughly treated with the surface roughness of the coating slurry to about 1 to 2 탆;
(d) coating the sliding member to a thickness of 0 to 30 mu m by any one of spraying, rolling, brushing, offset, and screen printing;
(e) after completion of the step (d), drying at 80 to 100 ° C for 30 to 60 minutes;
(f) after completion of the step (e), calcining at 200 to 250 ° C for 1 to 2 hours and then slowly cooling to room temperature
Wherein the coating slurry is coated on the substrate.

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