CN113801533A - Dry film lubricant based on dopamine modified pigment filler and application thereof - Google Patents
Dry film lubricant based on dopamine modified pigment filler and application thereof Download PDFInfo
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- 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
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- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/42—Polycarboxylic acids; Anhydrides, halides or low molecular weight esters thereof
- C08G59/4246—Polycarboxylic acids; Anhydrides, halides or low molecular weight esters thereof polymers with carboxylic terminal groups
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Abstract
The invention belongs to the technical field of metal fastener lubricating coatings, and particularly relates to a dry film lubricant based on dopamine modified pigment filler and application thereof. The invention provides a dry film lubricant based on dopamine modified pigment filler, which comprises the following components in parts by weight: 10-30 parts of bonding resin, 10-20 parts of maleic anhydride curing agent, 0.05-1 part of catalyst, 10-40 parts of dopamine modified pigment filler, 40-60 parts of organic solvent and 0.5-2.5 parts of auxiliary agent; the dopamine modified pigment filler is dopamine modified molybdenum disulfide and/or dopamine modified MXene; the bonding resin is one or more of epoxy resin and modified epoxy resin. The results of the examples show that the lubricating coating prepared by the dry film lubricant provided by the invention has excellent appearance, good medium resistance and adhesion on the premise of lower friction coefficient.
Description
Technical Field
The invention belongs to the technical field of metal fastener lubricating coatings, and particularly relates to a dry film lubricant based on dopamine modified pigment filler and application thereof.
Background
The metal fastener has wide application and large dosage, relates to various industries, is the development basis of industrial industry, is known as industrial rice, and influences the quality and the safety of the whole mechanical product.
Usually, metal fastener itself has certain corrosion protection performance, and metal fastener material can form one deck oxide layer when the surface receives the damage in order to prevent further emergence corruption, but when fastener was locked, produced pressure and heat between the profile of teeth can destroy the oxide layer, cause to take place to block between the screw thread or cut, and then take place to glue the phenomenon, finally lead to the fastener to lock completely, unable dismantlement or unable locking. In addition, when the fastener is installed, the surface of the fastener is easy to slide, or the temperature is rapidly increased due to the too high screwing speed of the wrench, so that the locking is caused. Therefore, the surface lubrication treatment of the fastener is very necessary, the relationship between the torque and the pressure of the fastener can be improved through the surface lubrication treatment, the torsion coefficient is adjusted, and the locking or thread slipping of the fastener is effectively prevented.
Common fastener lubrication treatments include lubricating oils, greases, and lubricious coatings. Wherein, the lubricating grease has high viscosity and can be attached to the surface of a part to cause surface pollution; the lubricating coating can be uniformly coated on the surface of the part, is firmly combined with the substrate and has a lower friction coefficient, such as: chinese patent CN106062105A discloses a solid lubricant with main components of phenolic resin and epoxy resin, the friction coefficient of the solid lubricant is 0.14-0.59 when the solid lubricant is used for a sliding part made of metal, but the existing fastener lubricating coating technology still has the problems of poor appearance, poor bonding force with a substrate, poor corrosion resistance and poor oil resistance, and the service requirement of a high-end metal fastener cannot be met.
Disclosure of Invention
When the dry film lubricant provided by the invention is used as a lubricating coating of a metal fastener, the dry film lubricant has excellent appearance, good salt water resistance, oil resistance and adhesive force on the premise of lower friction coefficient.
The invention provides a dry film lubricant based on dopamine modified pigment filler, which comprises the following components in parts by weight:
10-30 parts of bonding resin, 10-20 parts of maleic anhydride curing agent, 0.05-1 part of catalyst, 10-40 parts of dopamine modified pigment filler, 40-60 parts of organic solvent and 0.5-2.5 parts of auxiliary agent;
the dopamine modified pigment filler is dopamine modified molybdenum disulfide and/or dopamine modified MXene;
the bonding resin is one or more of epoxy resin and modified epoxy resin.
Preferably, the dopamine modified pigment filler is dopamine modified molybdenum disulfide and dopamine modified MXene;
the mass ratio of the dopamine modified molybdenum disulfide to the dopamine modified MXene is (0.5-2): 1;
the dopamine modified MXene is dopamine modified Ti3AlC2And/or dopamine modified Ti2AlC。
Preferably, the modified epoxy resin is one or more of polyurethane modified epoxy resin, phenolic aldehyde modified epoxy resin, acrylic acid modified epoxy resin and organic silicon modified epoxy resin.
Preferably, the maleic anhydride curing agent is one or more of a styrene-butadiene-maleic anhydride copolymer, a maleic anhydride-ethylene-vinyl acetate copolymer, a styrene-maleic anhydride copolymer, a styrene-methyl methacrylate-maleic anhydride copolymer and a methyl methacrylate-maleic anhydride copolymer.
Preferably, the catalyst is one or more of imidazole and an imidazole derivative.
Preferably, the polar organic solvent is at least two of xylene, butyl cellosolve, an ester-based solvent and a ketone-based solvent.
Preferably, the auxiliary agent comprises a wetting dispersant, a defoaming agent, a leveling agent and an anti-settling agent.
Preferably, the wetting dispersant is one or more of 169, 161 and 163 of BYK series;
the defoaming agent is BYK051 or BYK 054;
the leveling agent is 065, 020, 354 or 300 of BYK series;
the anti-settling agent is fumed silica or organic bentonite.
The invention provides application of the dry film lubricant in the technical scheme in preparation of a surface lubricating coating of a metal fastener.
Preferably, the application is: diluting the dry film lubricant, coating the diluted coating on the surface of a substrate, and heating and curing;
the dilution times are 2-4 times of the weight of the dry film lubricant;
the curing temperature is 150-180 ℃, and the curing time is 1-3 h;
the thickness of the lubricating coating obtained by curing is 5-20 mu m.
The invention provides a dry film lubricant based on dopamine modified pigment filler, which comprises the following components in parts by weight: 10-30 parts of bonding resin, 10-20 parts of maleic anhydride curing agent, 0.05-1 part of catalyst, 10-40 parts of dopamine modified pigment filler, 40-60 parts of organic solvent and 0.5-2.5 parts of auxiliary agent; the dopamine modified pigment filler is dopamine modified molybdenum disulfide and/or dopamine modified MXene; the bonding resin is one or more of epoxy resin and modified epoxy resin. According to the dry film lubricant provided by the invention, the bonding resin, the maleic anhydride curing agent, the catalyst, the dopamine modified pigment filler and the auxiliary agent in specific parts by weight are dissolved in the organic solvent, and under the heating condition, the epoxy group of the bonding resin and the maleic anhydride curing agent are subjected to cross-linking reaction of the epoxy group and the acid anhydride group under the action of the catalyst, so that the adhesive capacity of the bonding resin and a metal fastener matrix is further improved; the dopamine modified molybdenum disulfide and/or dopamine modified MXene play a role in lubrication and wear resistance, and meanwhile, the dry film lubricant is gray black; the modification of dopamine can improve the dispersibility and stability of molybdenum disulfide and/or MXene in a solution system, and the amine group contained in the dopamine reacts with the epoxy group in the binding resin, so that the oil resistance and the corrosion resistance of the coating prepared from the dry-film lubricant are further improved. The results of the examples show that the coefficient of friction of the lubricating coating prepared from the dry film lubricant provided by the invention is less than 0.22; the adhesive force is 0-1 grade; when the 3.5 percent sodium chloride solution is treated for 1000 hours at 25 ℃, the coating has no bubbling, falling and rustiness; the coating is not foamed and dropped after being soaked in hydraulic oil at 65 ℃ for 30 days.
Drawings
FIG. 1 is a microscopic cross-sectional view of a fastener having a lubricating coating prepared in accordance with example 1, after immersion in a 3.5% sodium chloride solution;
FIG. 2 is a microscopic cross-sectional view of a fastener having a lubricating coating prepared in accordance with example 2, after immersion in a 3.5% sodium chloride solution;
FIG. 3 is a microscopic cross-sectional view of a fastener having a lubricating coating prepared in example 3 after immersion in a 3.5% sodium chloride solution;
FIG. 4 is a microscopic cross-sectional view of a fastener having a lubricating coating prepared in example 4 after immersion in a 3.5% sodium chloride solution;
FIG. 5 is a microscopic cross-sectional view of a fastener having a lubricating coating prepared in accordance with example 5 after immersion in a 3.5% sodium chloride solution;
FIG. 6 is a microscopic cross-sectional view of a fastener having a lubricating coating prepared in accordance with example 6, after immersion in a 3.5% sodium chloride solution;
FIG. 7 shows the results of the friction coefficient test of the lubricating coatings prepared in examples 1 to 3.
Detailed Description
The invention provides a dry film lubricant based on dopamine modified pigment filler, which comprises the following components in parts by weight:
10-30 parts of bonding resin, 10-20 parts of maleic anhydride curing agent, 0.05-1 part of catalyst, 10-40 parts of dopamine modified pigment filler, 40-60 parts of organic solvent and 0.5-2.5 parts of auxiliary agent;
the dopamine modified pigment filler is dopamine modified molybdenum disulfide and/or dopamine modified MXene;
the bonding resin is one or more of epoxy resin and modified epoxy resin.
In the present invention, the starting materials used are all commercially available products well known to those skilled in the art, unless otherwise specified.
The dry film lubricant provided by the invention comprises 10-30 parts by weight of bonding resin, preferably 15-25 parts by weight, and more preferably 18-20 parts by weight. In the invention, the bonding resin is one or more of epoxy resin and modified epoxy resin, the modified epoxy resin is preferably one or more of polyurethane modified epoxy resin, phenolic aldehyde modified epoxy resin, acrylic acid modified epoxy resin and organic silicon modified epoxy resin, and more preferably polyurethane modified epoxy resin, phenolic aldehyde modified epoxy resin, acrylic acid modified epoxy resin or organic silicon modified epoxy resin. In the present invention, when the binder resin includes two or more of the above substances, the present invention has no particular requirement on the mass ratio of the specific substances.
The dry film lubricant provided by the invention comprises 10-20 parts of maleic anhydride curing agent by taking adhesive resin as a reference, preferably 12-16 parts, and more preferably 13.5-15 parts; in the present invention, the maleic anhydride-based curing agent is preferably one or more of a styrene-butadiene-maleic anhydride copolymer, a maleic anhydride-ethylene-vinyl acetate copolymer, a styrene-maleic anhydride copolymer, a styrene-methyl methacrylate-maleic anhydride copolymer, a methyl methacrylate-maleic anhydride copolymer, and more preferably a styrene-butadiene-maleic anhydride copolymer, a methyl methacrylate-maleic anhydride copolymer, or a styrene-maleic anhydride copolymer; in the present invention, when the curing agent includes two or more of the above-mentioned substances, there is no particular requirement for the mass ratio of the specific substances in the present invention.
In a specific embodiment of the present invention, the combination relationship between the binding resin and the maleic anhydride curing agent is preferably: when the binding resin includes an acrylic modified epoxy resin, the maleic anhydride-based curing agent is preferably a styrene-methyl methacrylate-maleic anhydride copolymer; when the binding resin includes a urethane-modified epoxy resin, the maleic anhydride-based curing agent is preferably a styrene-butadiene-maleic anhydride copolymer; when the binding resin comprises a phenolic-modified epoxy resin, the maleic anhydride-based curing agent is preferably a methyl methacrylate-maleic anhydride copolymer; when the binding resin includes a silicone-modified epoxy resin, the maleic anhydride-based curing agent is preferably a styrene-maleic anhydride copolymer; when the binding resin includes an epoxy resin, the maleic anhydride-based curing agent is preferably a methyl methacrylate-maleic anhydride copolymer.
In the invention, the epoxy group of the binding resin and the maleic anhydride curing agent generate cross-linking reaction of the epoxy group and the anhydride group under the action of the catalyst, so that the adhesion capability of the lubricating coating and the substrate is enhanced.
The dry film lubricant provided by the invention comprises 0.05-1 part of catalyst, preferably 0.065-0.8 part, based on the adhesive resin; in the present invention, the catalyst is preferably one or more of imidazole and an imidazole derivative, the imidazole derivative is preferably methylimidazole and/or ethylimidazole; in the present invention, when the catalyst includes two or more of the above-mentioned substances, the present invention has no particular requirement on the mass ratio of the specific substances.
In the invention, the catalyst can catalyze the crosslinking reaction between the binding resin and the maleic anhydride curing agent.
Based on the adhesive resin, the dry film lubricant provided by the invention comprises 10-40 parts of dopamine modified pigment filler, preferably 12.5-36.5 parts, and more preferably 15-32.5 parts; in the present invention, the dopamine is modifiedThe color filler is dopamine modified molybdenum disulfide and/or dopamine modified MXene, preferably dopamine modified molybdenum disulfide and dopamine modified MXene; in the invention, the mass ratio of the dopamine modified molybdenum disulfide to the dopamine modified MXene is preferably (0.5-2): 1, more preferably (1.0 to 1.5): 1. in the invention, the dopamine modified MXene is preferably dopamine modified Ti3AlC2And/or dopamine modified Ti2AlC, more preferably dopamine modified Ti3AlC2Or dopamine modified Ti2AlC, most preferably dopamine modified Ti3AlC2。
According to the invention, the functions of lubrication and wear resistance are further improved by compounding the dopamine modified molybdenum disulfide and the dopamine modified MXene, the dispersibility and stability of the molybdenum disulfide and/or MXene in the dry film lubricant can be improved by modifying the dopamine, the amine group of the dopamine reacts with the epoxy group in the binding resin, and the oil resistance and the corrosion resistance of the coating prepared from the dry film lubricant are further improved.
In the invention, the dopamine modified molybdenum disulfide is preferably obtained by self-making, and the preparation method of the dopamine modified molybdenum disulfide comprises the following steps:
and mixing dopamine, molybdenum disulfide and an acidic buffer solution in protective gas, and carrying out modification reaction to obtain the dopamine-modified molybdenum disulfide.
In the invention, the acidic buffer solution is preferably an acetic acid buffer solution or an acetic acid buffer solution, the mass concentration of the substance of the acidic buffer solution is preferably 0.02-0.08 mol/L, more preferably 0.05mol/L, and the pH value of the acidic buffer solution is preferably 4.3; in the invention, the mass ratio of the dopamine to the molybdenum disulfide is preferably (0.1-0.4): 1, more preferably (0.15-0.25): 1; in the invention, in a mixed solution obtained by mixing dopamine, molybdenum disulfide and an acidic buffer solution, the mass concentration of the dopamine is preferably 0.02-0.08 g/mL, and more preferably 0.04-0.06 g/mL.
In the present invention, the protective gas is preferably nitrogen or an inert gas, more preferably nitrogen, and in the present invention, the dopamine, the molybdenum disulfide and the acidic buffer solution are preferably mixed in sequence by sequentially adding the dopamine and the molybdenum disulfide to the acidic buffer solution; before mixing, the invention preferably introduces protective gas into the acidic buffer solution to remove oxygen in the acidic buffer solution, and the gas protection is continued until the reaction is finished.
In the present invention, the temperature of the modification reaction is preferably room temperature, the time of the modification reaction is preferably 6 hours, in the present invention, the modification reaction is preferably performed under stirring, and the present invention has no special requirement on the specific implementation process of the stirring.
In the invention, the dopamine is deposited on the surface of the molybdenum disulfide to realize the modification of the molybdenum disulfide; in the invention, the deposition is monolayer deposition, and the obtained dopamine modified molybdenum disulfide is monolayer dopamine coated molybdenum disulfide.
After the modification reaction is finished, the reaction solution is preferably subjected to post-treatment to obtain dopamine modified molybdenum disulfide; in the present invention, the post-treatment preferably comprises: carrying out solid-liquid separation and washing in sequence; in the invention, the solid-liquid separation mode is preferably centrifugation, and the invention has no special requirement on the specific implementation mode of the solid-liquid separation; the invention preferably washes the solid product after solid-liquid separation, in the invention, the washing is preferably water washing, the invention has no special requirement on the specific implementation process of the washing, and the washing is carried out until the washing liquid is neutral.
In the invention, the dopamine modified MXene is preferably obtained by self-making, and the preparation method of the dopamine modified MXene comprises the following steps:
and mixing dopamine, MXene and an acidic buffer solution in protective gas, and carrying out modification reaction to obtain the dopamine modified MXene.
In the invention, the mass ratio of the dopamine to the MXene is preferably (1-2): 8, and more preferably (1.5-1.6): 8.
The range of the condition parameters for preparing the dopamine modified MXene is the same as that for preparing the dopamine modified molybdenum disulfide, and the details are not repeated here.
In the invention, the dopamine is deposited on the surface of MXene to realize the modification of MXene; in the invention, the deposition is monolayer deposition, and the obtained dopamine modified MXene is monolayer dopamine coated MXene.
In the invention, the dopamine modified pigment filler is used as a lubricating and wear-resistant component of the dry film lubricant, and the molybdenum disulfide and MXene are modified by dopamine, so that the dispersibility and stability of the molybdenum disulfide and MXene in the dry film lubricant are improved, and the amine group in the dopamine modified molybdenum disulfide and/or dopamine modified MXene reacts with the epoxy functional group in the binding resin, thereby further improving the medium resistance and the corrosion resistance of the coating prepared from the dry film lubricant; while imparting a grayish black color to the dry lubricant.
The dry film lubricant provided by the invention comprises 40-60 parts of organic solvent by taking adhesive resin as a reference, preferably 35-55 parts, and more preferably 37.5-50 parts; in the present invention, the polar organic solvent is preferably at least two of xylene, butyl cellosolve, an ester-based solvent and a ketone-based solvent; the ester-based solvent is preferably one or more of ethyl acetate, butyl acetate and propylene glycol methyl ether acetate; the ketone based solvent is preferably acetone and/or cyclohexanone; in the present invention, the organic solvent is more preferably three or four of xylene, ethyl acetate, acetone, cyclohexanone, butyl acetate, ethylene glycol butyl ether, and propylene glycol methyl ether acetate; in a specific embodiment of the present invention, when the solvent is three of the above-mentioned substances, the solvent of the present invention is specifically a mixed solvent of xylene, cyclohexanone and propylene glycol methyl ether acetate; the mass ratio of the xylene to the cyclohexanone to the propylene glycol monomethyl ether acetate is preferably 5:20: 4; or a mixed solvent of ethyl acetate, cyclohexanone and propylene glycol methyl ether acetate, wherein the mass ratio of ethyl acetate, cyclohexanone and propylene glycol methyl ether acetate is preferably 5:20:5 or 15:13: 3; when the solvent is four of the above substances, the solvent of the present invention is specifically a mixed solvent of butyl acetate, acetone, ethylene glycol butyl ether and cyclohexanone, and the mass ratio of butyl acetate, acetone, ethylene glycol butyl ether and cyclohexanone is preferably 7.5: 10:7.5:5, 3:2:5:12 or 5:10:5: 10.
In the invention, the organic solvent is used for dissolving the bonding resin, the curing agent, the catalyst, the auxiliary agent and dispersing the dopamine modified pigment filler.
The dry film lubricant provided by the invention comprises 0.5-2.5 parts of an auxiliary agent, preferably 0.65-1.5 parts, and more preferably 1-1.25 parts by weight based on the adhesive resin; in the present invention, the auxiliary agent preferably includes a wetting dispersant, a defoaming agent, a leveling agent and an anti-settling agent;
the dry film lubricant provided by the invention comprises 0.03-0.12 part of wetting dispersant, preferably 0.05-0.09 part, based on the adhesive resin; in the present invention, the wetting dispersant is preferably one or more of 169, 161 and 163 of BYK series, more preferably 163 of BYK series.
The dry film lubricant provided by the invention comprises 0.04-0.05 part of defoaming agent by taking the adhesive resin as a reference; in the present invention, the antifoaming agent is preferably BYK051 or BYK054, and more preferably BYK 054.
The dry film lubricant provided by the invention comprises 0.05-0.15 part of advection agent, preferably 0.06-0.1 part, based on the adhesive resin; the levelling agent is preferably of the BYK series 065, 020, 354 or 300, more preferably BYK 020.
The dry film lubricant provided by the invention comprises 0.5-0.6 part of anti-settling agent by taking the adhesive resin as a reference; in the present invention, the anti-settling agent is preferably fumed silica or organobentonite, and more preferably fumed silica.
In the invention, the auxiliary agent ensures that the coating formed by the dry film lubricant has good appearance and no defects such as bubbles and the like.
In the present invention, the fineness of the dry film lubricant is preferably 10 μm or less.
In the present invention, the method for preparing the dry film lubricant according to the above technical scheme preferably includes the following steps:
and sequentially mixing and grinding the binding resin, the curing agent, the catalyst, the dopamine modified pigment filler, the solvent and the auxiliary agent to obtain the dry film lubricant.
In the present invention, the mixing is preferably performed under stirring, and the stirring time is preferably 30 min; the stirring is preferably mechanical stirring, and the invention has no special requirements on the specific implementation process of the stirring.
In the present invention, the order of mixing is preferably: carrying out first mixing on the bonding resin, the curing agent and the solvent to obtain a first mixed solution; and carrying out second mixing on the first mixed solution, the catalyst, the dopamine modified pigment filler and the auxiliary agent.
In the invention, the grinding speed is preferably 300r/min, the grinding is preferably carried out in a planetary ball mill, the invention has no special requirement on the specific implementation process of the grinding, and in the invention, the fineness of the dry film lubricant is preferably less than or equal to 10 mu m.
The invention provides application of the dry film lubricant in the technical scheme in preparation of a surface lubricating coating of a metal fastener.
In the present invention, the application is preferably: and diluting the dry film lubricant, coating the diluted coating on the surface of a substrate, and curing. In the present invention, the dilution ratio is preferably 2 to 4 times of the weight of the dry film lubricant, and the solvent for dilution is preferably acetone.
In the invention, the coating mode is preferably spray coating or dip coating, in the invention, the spraying frequency is preferably 2-4 times, and the invention has no special requirements on the specific implementation process of the spray coating; in the invention, the dip-coating time is preferably 5-30 s, and the invention has no special requirement on the specific implementation process of the dip-coating; in the present invention, the substrate is preferably a surface of a metal fastener, and the material of the metal fastener is preferably alloy steel, stainless steel, nickel-based alloy, aluminum alloy, or titanium alloy.
The substrate is preferably grit blasted prior to the coating, and the present invention does not require special handling of the grit blast.
In the invention, the curing temperature is preferably 150-180 ℃, and the curing time is preferably 1-3 h; the present invention has no particular requirement for the specific implementation of the curing process.
In the invention, the thickness of the lubricating coating obtained by curing is preferably 5-20 μm, and more preferably 10-15 μm.
In order to further illustrate the present invention, the following embodiments are described in detail, but they should not be construed as limiting the scope of the present invention.
Example 1
Introducing nitrogen into 500mL of acetic acid buffer solution (pH is 4.3) for 30min, sequentially adding 20.00g of dopamine and 100.00g of molybdenum disulfide, stirring for 6h under the protection of nitrogen, centrifuging, and washing to obtain dopamine modified molybdenum disulfide;
introducing nitrogen into 500mL of acetic acid buffer solution (pH 4.3) for 30min, sequentially adding 20.00g of dopamine and 80.00g of MXene, stirring for 6h under the protection of nitrogen, centrifuging, and cleaning to obtain dopamine modified Ti3AlC2；
Adding 12.00g of acrylic acid modified epoxy resin and 8.00g of styrene-methyl methacrylate-maleic anhydride copolymer into 5.00g of dimethylbenzene, 20.00g of cyclohexanone and 4.00g of propylene glycol methyl ether acetate, stirring and dissolving, and then sequentially adding 8.00g of dopamine modified molybdenum disulfide and 4.30g of dopamine modified Ti3AlC20.10g of imidazole, 0.09g of BYK163, 0.05g of BYK054, 0.05g of BYK020 and 0.50g of silicon dioxide are mixed and stirred for 30 minutes, and then the paint is ground at the rotating speed of 300r/min until the fineness is less than or equal to 10 mu m, and the ball milling is stopped, so that the dry film lubricant is obtained.
And adding acetone with the weight being 2.5 times that of the dry film lubricant, uniformly stirring and dispersing, then spraying the dry film lubricant on the surface of the stainless steel substrate subjected to sand blasting, and curing at 150 ℃ for 2.5 hours to obtain the lubricating coating.
Example 2
Dopamine modified molybdenum disulfide and dopamine modified Ti were prepared according to the method of example 13AlC2；
10.00g of a urethane-modified epoxy resin, 10.00g of a styrene-butadiene-maleic anhydride copolymer,adding 5.00g of ethyl acetate, 20.00g of cyclohexanone and 5.00g of propylene glycol methyl ether acetate, stirring and dissolving, and then sequentially adding 4.00g of dopamine modified molybdenum disulfide and 6.20g of dopamine modified Ti3AlC20.08g of ethylimidazole, 0.05g of BYK163, 0.05g of BYK054, 0.05g of BYK020 and 0.50g of organic bentonite are stirred and dispersed for 30 minutes, and then the paint is ground at the rotating speed of 300r/min until the fineness is less than 10 mu m, and the ball milling is stopped to obtain a dry film lubricant;
and adding acetone with the mass of 3 times of that of the dry film lubricant, stirring and dispersing uniformly, then spraying the dry film lubricant on the surface of the stainless steel fastener substrate subjected to sand blasting, and curing at 160 ℃ for 2 hours to obtain the lubricating coating.
Example 3
Dopamine modified molybdenum disulfide and dopamine modified Ti were prepared according to the method of example 13AlC2；
Adding 15.50g of phenolic aldehyde modified epoxy resin, 4.50g of methyl methacrylate-maleic anhydride copolymer into 7.50g of butyl acetate, 10.00g of acetone, 7.50g of ethylene glycol butyl ether and cyclohexanone, stirring and dissolving, and then sequentially adding 8.00g of dopamine modified molybdenum disulfide and 4.20g of dopamine modified Ti3AlC20.10g of methylimidazole, 0.03g of BYK163, 0.04g of BYK054, 0.06g of BYK020 and 0.60g of silicon dioxide are stirred and dispersed for 30 minutes, and then the paint is ground at the rotating speed of 300r/min until the fineness is less than 10 mu m, and the ball milling is stopped to obtain a dry film lubricant;
and adding acetone with the mass being 3 times that of the dry film lubricant into the dry film lubricant, uniformly stirring and dispersing the dry film lubricant, then spraying the dry film lubricant on the surface of the stainless steel fastener substrate subjected to sand blasting, and curing the dry film lubricant at 180 ℃ for 2 hours to obtain the protective coating.
Example 4
Preparing dopamine modified molybdenum disulfide according to the method of example 1;
adding 15.00g of styrene-maleic anhydride copolymer and 5.00g of organosilicon modified epoxy resin into 3.00g of butyl acetate, 2.00g of acetone, 12.00g of cyclohexanone and 5.00g of ethylene glycol butyl ether, stirring and dissolving, then sequentially adding 11.5g of dopamine modified molybdenum disulfide, 0.10g of methylimidazole, 0.12g of BYK163, 0.04g of BYK054, 0.06g of BYK020 and 0.60g of silicon dioxide, stirring and dispersing for 30 minutes, then grinding the coating at a rotating speed of 300r/min until the fineness is less than 10 mu m, and stopping ball milling to obtain a dry film lubricant;
and adding acetone with the mass of 3 times of that of the dry film lubricant, stirring and dispersing uniformly, then spraying the dry film lubricant on the surface of the stainless steel base material subjected to sand blasting, and curing at 160 ℃ for 2 hours to obtain the protective coating.
Example 5
Dopamine modified molybdenum disulfide and dopamine modified Ti were prepared according to the method of example 13AlC2；
Adding 10.00g of epoxy resin and 10.00g of methyl methacrylate-maleic anhydride copolymer into 15.00g of butyl acetate, 13.00g of cyclohexanone and 2.00g of butyl glycol ether, stirring and dissolving, and then sequentially adding 5.00g of dopamine modified molybdenum disulfide and 5.50g of dopamine modified Ti3AlC20.12g of methylimidazole, 0.03g of BYK169, 0.07g of BYK051, 0.15g of BYK028, 0.15g of BYK020 and 0.50g of bentonite are mixed, stirred and dispersed for 30 minutes, and then the paint is ground at the rotating speed of 300r/min until the fineness is less than 10 mu m, and the ball milling is stopped to obtain a dry film lubricant;
and adding acetone with the mass being 3 times that of the dry film lubricant into the dry film lubricant, uniformly stirring and dispersing the dry film lubricant, then dip-coating the dry film lubricant on the surface of the stainless steel substrate subjected to sand blasting, and curing the dry film lubricant at 160 ℃ for 2 hours to obtain the protective coating.
Example 6
Dopamine modified molybdenum disulfide and dopamine modified Ti were prepared according to the method of example 13AlC2；
Adding 12.50g of polyurethane modified epoxy resin and 7.50g of styrene-butadiene-maleic anhydride copolymer into 5.00g of butyl acetate, 10.00g of cyclohexanone, 10.00g of acetone and 5.00g of butyl glycol ether, stirring and dissolving, and then sequentially adding 5.50g of dopamine modified molybdenum disulfide and 4.50g of modified dopamine Ti30.08g of methylimidazole, 0.05g of BYK163, 0.04g of BYK054, 0.06g of BYK020 and 0.50g of organic bentonite, dispersing at a high speed for 30 minutes, grinding the paint at a rotating speed of 300r/min until the fineness is less than 10 mu m, and stopping ball milling to obtain a dry film lubricant;
and adding acetone with the mass being 3 times that of the dry film lubricant into the dry film lubricant, stirring and dispersing the dry film lubricant uniformly, then dip-coating the dry film lubricant on the surface of the stainless steel fastener substrate subjected to sand blasting, and curing the dry film lubricant at 180 ℃ for 2 hours to obtain the lubricating coating.
Test example
The performance of the lubricating coatings prepared in examples 1 to 6 was tested, and the test results are shown in table 1 and fig. 1 to 7, and the specific test method was as follows:
coating thickness: testing was performed according to the method of HB6688-92, "Hot curing molybdenum disulfide Dry film Lubricant";
saline water resistance: the test was carried out according to the method of NASM 1312.9-1997 test methods for alternate dipping for fasteners test; the method specifically comprises the following steps: 3.5 percent sodium chloride solution at 25 ℃ for 1000 h; and after the test result, the sample is cleaned, dried, cut, embedded and polished, and then the section corrosion condition is observed under a microscope.
Frictional wear performance: and (3) testing the frictional wear performance of the coating by using a high-speed ring block testing machine, wherein the test load is 500N, and the speed is 200 rpm.
Adhesion force: the test was carried out according to the method in GB/T9286-1998 test for marking test of paint and varnish films;
oil resistance: the test was carried out by the method described in GB/T9274-1988 determination of liquid-resistant media for paints and varnishes; the method specifically comprises the following steps: hydraulic oil, 65 ℃, 30 days.
As can be seen from table 1 and fig. 1 to 7, the friction coefficient of the lubricant coating obtained by the dry film lubricant provided by the present invention is < 0.22; the adhesive force is 0-1 grade, and the hardness is 4-6H; when the 3.5 percent sodium chloride solution is treated for 1000 hours at 25 ℃, the coating has no bubbling, falling and rustiness; when the hydraulic oil is treated for 30 days at 65 ℃, the coating does not foam and fall off; the dry film lubricant provided by the invention has good medium resistance and adhesive force on the premise of low friction coefficient when used as a lubricating coating of a metal fastener.
TABLE 1 Performance test results for lubricating coatings prepared in examples 1-6
Although the present invention has been described in detail with reference to the above embodiments, it is only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and the embodiments are within the scope of the present invention.
Claims (10)
1. A dry film lubricant based on a dopamine modified pigment filler is characterized by comprising the following components in parts by weight:
10-30 parts of bonding resin, 10-20 parts of maleic anhydride curing agent, 0.05-1 part of catalyst, 10-40 parts of dopamine modified pigment filler, 40-60 parts of organic solvent and 0.5-2.5 parts of auxiliary agent;
the dopamine modified pigment filler is dopamine modified molybdenum disulfide and/or dopamine modified MXene;
the bonding resin is one or more of epoxy resin and modified epoxy resin.
2. The dry film lubricant according to claim 1, wherein the dopamine modified pigment filler is dopamine modified molybdenum disulfide and dopamine modified MXene;
the dopamine modified MXene is dopamine modified Ti3AlC2And/or dopamine modified Ti2AlC；
The mass ratio of the dopamine modified molybdenum disulfide to the dopamine modified MXene is (0.5-2): 1.
3. the dry film lubricant according to claim 1, wherein the modified epoxy resin is one or more of a urethane-modified epoxy resin, a phenolic-modified epoxy resin, an acrylic-modified epoxy resin, and a silicone-modified epoxy resin.
4. The dry film lubricant according to claim 1 or 3, wherein the maleic anhydride-based curing agent is one or more of a styrene-butadiene-maleic anhydride copolymer, a maleic anhydride-ethylene-vinyl acetate copolymer, a styrene-maleic anhydride copolymer, a styrene-methyl methacrylate-maleic anhydride copolymer, and a methyl methacrylate-maleic anhydride copolymer.
5. The dry film lubricant according to claim 1, wherein the catalyst is one or more of imidazole and an imidazole derivative.
6. The dry film lubricant according to claim 1, wherein the organic solvent is at least two of xylene, butyl cellosolve, an ester-based solvent, and a ketone-based solvent.
7. The dry film lubricant according to claim 1, wherein the auxiliary agents comprise wetting dispersants, defoamers, leveling agents, and anti-settling agents.
8. The dry film lubricant according to claim 7, wherein the wetting dispersant is one or more of 169, 161, and 163 of the BYK series;
the defoaming agent is BYK051 or BYK 054;
the leveling agent is 065, 020, 354 or 300 of BYK series;
the anti-settling agent is fumed silica or organic bentonite.
9. Use of the dry film lubricant according to any one of claims 1 to 8 for producing a lubricating coating on the surface of a metal fastener.
10. The application according to claim 9, wherein the application is: diluting the dry film lubricant, coating the diluted coating on the surface of a substrate, and heating and curing;
the dilution times are 2-4 times of the weight of the dry film lubricant;
the curing temperature is 150-180 ℃, and the curing time is 1-3 h;
the thickness of the lubricating coating obtained by curing is 5-20 mu m.
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