CN116769389A - Water-based scratch-resistant protective coating and preparation method thereof - Google Patents

Water-based scratch-resistant protective coating and preparation method thereof Download PDF

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CN116769389A
CN116769389A CN202310663604.3A CN202310663604A CN116769389A CN 116769389 A CN116769389 A CN 116769389A CN 202310663604 A CN202310663604 A CN 202310663604A CN 116769389 A CN116769389 A CN 116769389A
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agent
protective coating
parts
coating
stirring
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易依林
唐聚宝
胡熙
刘家甫
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Zhuzhou Rubber Research and Design Institute Co Ltd of Chemchina
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Zhuzhou Rubber Research and Design Institute Co Ltd of Chemchina
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Abstract

A water-based scratch-resistant protective coating and a preparation method thereof comprise the following raw material components: base material: 0-10 parts of pigment, 5-50 parts of filler and 0-45 parts of polyurethane emulsion; 0.1-0.5 part of PH stabilizer, 0.1-0.5 part of dispersing agent or 0-0.7 part of wetting dispersing agent, 0-1 part of wetting agent, 0.1-1 part of defoamer, 0-5 part of cosolvent, 0-3 parts of wear-resistant auxiliary agent or 0-5 part of slipping agent, 0-2 parts of shrink-proof Kong Chuji, 0-5 part of adhesion promoter, 0.1-0.5 part of rheological auxiliary agent or 0-0.5 part of anti-settling agent, 0-2 parts of thickening agent and 0-1 part of other auxiliary agents. The protective coating is used for the rubber coating on the metal surface, and a layer of water-based coating is coated on the rubber surface layer, so that the use amount of base rubber can be reduced, the rubber layer can be protected, the damage of the rubber layer can be prevented, the defect that the rubber is easy to age can be overcome, the coating has excellent smooth hand feeling, and the wear resistance and scratch resistance of the coating are improved.

Description

Water-based scratch-resistant protective coating and preparation method thereof
Technical Field
The application belongs to the technical field of coatings, and particularly relates to a water-based scratch-resistant protective coating and a preparation method thereof.
Background
In order to enhance the service life and weather resistance of metals, many metals are subjected to corrosion and rust prevention treatment and the aesthetic degree of the metals is improved, however, the current main corrosion prevention mode of the metals is electroplating or coating technology, and for the coating technology, the current common metal protective layer is an oily instant coating, so that the hardness is high, the protection and wear resistance effects are good, and the added solvent amount is very high. Meanwhile, the existing protective coating friendly to rubber is an AB component, when the addition proportion is not well controlled, the problems of coating defects or performance reduction can occur, the protective effect can be greatly reduced, and the practical application range is limited. The current coating industry is mature gradually, and the promotion of green environmental protection becomes one of important targets of various industries, which also provides new challenges for the coating technology.
In order to save cost and simultaneously achieve the coating protection effect, the metal surface layer is subjected to rubber coating protection, namely, the metal surface layer is subjected to rubber layer treatment, so that the treated metal surface layer is smooth and compact, has the impact buffering effect, is extremely low in cost, has an extremely good anti-corrosion and rust-preventing effect, has excellent anti-corrosion effect and has an excellent impact resistance effect because of good rubber adhesive force. Then the defect of the protection of the rubber coating is obvious, namely the surface rubber coating is relatively soft, and obvious scratches, pits, scratches and other damages can be generated under the action of light external force, so that the protection effect is damaged or reduced. The rubber protective layer on the metal surface is easy to be scraped, rubbed and bumped by external objects in the process of carrying, cutting and using, so that the appearance of the surface layer of the rubber protective layer is damaged or the metal of the inner layer is exposed, and even the rubber layer is dropped when serious. The hardness of the protective coating is not too high, otherwise, the surface layer is too fragile to prevent collision, fall off or crack, and the thin-layer metal has certain hardness, cannot influence the elasticity, bending resistance and adhesive force of the thin-layer metal, and has scratch resistance and certain friction effect. Therefore, for rubber layers, better adhesion and scratch resistance are required, and the coating layer needs to be resistant to bending, and the hardness cannot be too low nor too high, which presents another challenge for rubber protection.
Disclosure of Invention
The application aims to solve the technical problems and overcome the defects and shortcomings in the background art, and provides a water-based scratch-resistant protective coating and a preparation method thereof.
In order to solve the technical problems, the technical scheme provided by the application is as follows:
the water-based scratch-resistant protective coating is used for rubber protective coatings of metal surfaces and comprises the following raw material components in parts by weight:
base material: 0-10 parts of pigment, 5-50 parts of filler and 0-45 parts of polyurethane emulsion.
0.1-0.5 part of PH stabilizer, 0.1-0.5 part of dispersing agent or 0-0.7 part of wetting dispersing agent, 0-1 part of wetting agent, 0.1-1 part of defoamer, 0-5 part of cosolvent, 0-3 parts of wear-resistant auxiliary agent or 0-5 part of slipping agent, 0-2 parts of shrink-proof Kong Chuji, 0-5 part of adhesion promoter, 0.1-0.5 part of rheological auxiliary agent or 0-0.5 part of anti-settling agent, 0-2 parts of thickening agent and 0-1 part of other auxiliary agents.
Preferably, the thickness of the rubber protective coating on the metal surface is 5-50 μm.
The thickness of the rubber protective coating is typically in the range of 0-150um. The water-based scratch-resistant protective coating disclosed by the application has higher adhesiveness with a rubber layer and can be well chelated with metal, so that the thickness of the rubber layer is not too thick, and the overall effect is not affected even if the contact between the protective coating and the metal layer is not completely blocked.
Preferably, the raw materials of the water-based scratch-resistant protective coating further comprise 0-30 parts of acrylic resin, wherein the acrylic resin is silicon modified acrylic resin and/or silicon modified styrene-acrylic emulsion, and the polyurethane emulsion is water-based polyurethane dispersoid.
Preferably, the pigment is at least one of titanium white, carbon black, phthalocyanine blue or color paste, and the filler is one or more of barium sulfate, quartz powder, silica micropowder, talcum powder, mica powder or zinc stearate.
Preferably, the PH stabilizer is a multifunctional amine auxiliary agent and/or an amine neutralizer; the dispersing agent or wetting dispersing agent is one or more of an acrylic acid amine salt dispersing agent, an anionic wetting dispersing agent or a cationic wetting dispersing agent.
Preferably, the wetting agent is one or more of alkyl polyoxyethylene ether, modified silicone oil, modified polyorganosiloxane and polyether modified dimethyl siloxane.
Preferably, the defoaming agent is one or more of polyether modified polydimethylsiloxane, modified polyorganosiloxane or nonylphenol polyoxyethylene ether; the cosolvent is water and/or polyalcohol substances; the slipping agent and the wear-resistant auxiliary agent are one or more of gas silicon, modified wax powder, polyethylene wax emulsion, organosilicon wear-resistant slipping agent, polydimethylsiloxane emulsion, polysiloxane or polysiloxane crosslinked polymer dispersoid and the like; the shrink-proof Kong Chuji is organofluorine modified polyorganosiloxane; the adhesion promoter is a silane coupling agent.
Preferably, the anti-settling agent or the rheological additive is one or more of a cellulose leveling agent, an inorganic rheological agent, a magnesium aluminum silicate thixotropic lubricant, bentonite, an acrylic polymer or polyether modified dimethyl siloxane; the thickener is one or more of a modified association type alkali swelling thickener or a polyurethane PU thickener.
Preferably, the other auxiliary agents include a preservative, a bactericide and a rust inhibitor.
Under the same technical conception, the application also provides a preparation method of the water-based scratch-resistant protective coating, which comprises the following steps:
(1) Preparing a powder dispersion liquid: at least one of PH stabilizer, rheological additive or anti-settling agent, at least one of dispersing agent or wetting dispersing agent, wetting agent and defoaming agent 1/3-2/3 are added into the solution in turn for dispersing, pigment and filler are added, stirring and grinding are carried out, and powder dispersion liquid is obtained.
(2) Preparing an auxiliary agent: the slipping agent, the wear-resistant auxiliary agent and the thickening agent are prepared into a solution.
(3) Preparing a coating: adding acrylic resin and polyurethane emulsion into the powder dispersion liquid obtained in the step (1), uniformly stirring, adding the slipping agent and the wear-resistant auxiliary agent solution prepared in the step (2), and uniformly stirring; sequentially adding the shrinkage-preventing auxiliary agent, the adhesion promoter and other auxiliary agents, and uniformly stirring; and (3) finally adding the thickener prepared in the step (2), stirring, adding the residual defoamer, stirring and filtering to obtain the water-based scratch-resistant protective coating.
Preferably, in the step (1), the stirring is performed at a medium-high speed of 1200-3000r for 5-20min, and the grinding is performed by auxiliary grinding with glass beads, alumina, silicon carbide or zirconium beads with thinner particle size, and the grinding is performed at a high speed for 30-60min until the fineness is less than or equal to 35 mu m.
Preferably, in the step (3), the acrylic resin and polyurethane emulsion are added into the powder dispersion liquid, and the slipping agent and the wear-resistant auxiliary agent solution are added and stirred for 10-15min; stirring the added and prepared thickening agent at a medium-high speed of 800-2000r for 10-20min; and adding the residual defoaming agent, stirring and filtering, and stirring at a low speed of 200-800r for 5-10min.
Compared with the prior art, the application has the beneficial effects that:
(1) The protective coating is used for the rubber coating on the metal surface, and a layer of water-based coating is coated on the rubber surface layer, so that the use amount of base rubber can be reduced, the rubber layer can be protected, the damage of the rubber layer can be prevented, the defect that the rubber is easy to age can be overcome, the coating has excellent smooth handfeel, the wear resistance and scratch resistance of the coating are improved, the service life of a product is prolonged, the application value of the product is improved, the performance is stable, and the product is green, environment-friendly and safe and does not harm the health of a human body.
(2) The protective coating has proper hardness, and the waterborne polyurethane and the acrylic ester coating are compounded to endow the coating film layer with certain mechanical strength and toughness, so that proper elasticity of the rubber coating can be protected. The polyurethane forms a certain amount of urethane bonds, urea bonds and hydrogen bonds by polymerization molecules after film formation, and the hardness and lower fineness of pigment and filler are matched, so that the bonding effect of the coating and a basal plane can be enhanced, and the coating is favorable for force transmission when subjected to external force, and better hardness and wear resistance of the coating are provided. Therefore, the rubber layer can be protected from being scratched under a given hardness, thereby realizing the protection of the base material.
(3) The protective coating has stronger adhesive force, the aqueous polyurethane and the acrylic resin are compounded to be used as film forming substances, and a large number of hydrogen bonds exist among polymer macromolecules during film forming, so that the adhesive force of the coating to a metal substrate is obviously improved while the coating meets certain hardness and crosslinking density; the filler with smaller particle size increases the physical anchoring effect with the rubber coating, and improves the interfacial binding force, thereby improving the adhesion effect; the adhesive force promoter and other auxiliary agents enable a firm complex and hydrogen bonds to be formed between the bottom rubber coating and the coating film of the coating, so that the coating provided by the application has multiple advantages of good adhesive force, high hardness and the like.
(4) The protective coating has excellent smoothness and scratch resistance, the silicon-containing slipping auxiliary agent can endow the surface of the coating with silky touch feeling, auxiliary agent molecules can migrate to the surface layer of the coating, a layer of very thin polymer film is formed on the surface of the coating, and excellent smoothness and friction coefficient reduction can be brought to the paint film, so that the wear resistance of the paint film is improved. The polyurethane and the pigment filler with smaller particle size endow the coating with wear resistance and smoothness, and certain external force and friction can not damage the coating, so that the whole scratch-resistant and smooth hand feeling is formed. Meanwhile, the polyurethane can not generate bubbles and other byproducts affecting the appearance due to the reaction of the polyurethane, so that the polyurethane can keep good smoothness in the aspects of appearance and decoration, and has good appearance beautifying effect.
(5) The protective coating has the characteristic of environmental protection. The raw materials used in the application are basically water-based substances, the VOC content is extremely low, the pollution to the environment and the harm to human bodies can be reduced to the greatest extent, and the application has wider application prospect and development potential.
(6) The protective coating has double binding force of rubber and metal. The polyurethane coating has good metal penetration adhesion and adhesive force, and can still be adhered to metal when the rubber coating is thinner or has the defects of bubbles, small gaps and the like, so that the polyurethane coating is not easy to fall off, and the polyurethane has the characteristics of urethane bonds with high mechanical wear resistance and smooth toughness, so that the polyurethane coating can play a role in protecting metal. The polyurethane can be bonded with rubber well due to the compound characteristic, the adhesive force is higher than that of a common epoxy coating and the like, and meanwhile, the polyurethane can be chelated with metal well, so that the bonding effect of metal and rubber is considered, and the rubber of the inner layer metal and the middle layer can be protected well. Meanwhile, the polyurethane paint film can be used for acid, alkali, salt and petroleum products well, can be used for complex environments, can replace rubber to protect some harsh complex chemical external environments, and further protects internal metals. Therefore, the protective coating provided by the application has multiple synergistic protective effects on the rubber coating of the metal surface.
Detailed Description
The present application will be described more fully hereinafter with reference to the preferred embodiments for the purpose of facilitating understanding of the present application, but the scope of the present application is not limited to the following specific embodiments.
Unless defined otherwise, all technical and scientific terms used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the scope of the present application.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present application are commercially available or may be prepared by existing methods.
Example 1:
a water-based scratch-resistant protective coating for a rubber protective coating of a metal surface comprises the following raw material components in parts by weight: 45 parts of filler, 40 parts of polyurethane emulsion, 0.1 part of PH stabilizer, 0.25 part of dispersing agent, 0.15 part of wetting agent, 0.2 part of defoamer, 0.5 part of cosolvent, 0.5 part of wear-resistant auxiliary agent, 0.3 part of shrink-proof Kong Chuji, 0.1 part of rheological auxiliary agent, 0.2 part of thickener, 0.3 part of other auxiliary agents and the balance of water; the filler is barium sulfate; the polyurethane emulsion is an aqueous polyurethane dispersion; the wetting agent is modified silicone oil; the defoaming agent is modified polyorganosiloxane; the wear-resistant auxiliary agent is polyethylene wax emulsion.
Wherein the PH stabilizer is multifunctional amine auxiliary agent AMP-95; the dispersing agent is an acrylic acid amine salt dispersing agent; the rheological aid is a cellulose flatting agent, and is specifically hydroxyethyl cellulose; the cosolvent is water; the thickener is a modified associative alkali swelling thickener; the other auxiliary agent is preservative.
The preparation method of the water-based scratch-resistant protective coating comprises the following steps:
s1, preparing powder dispersion liquid.
(1) Premixing: adding 85% water into a dispersing container, sequentially adding a PH stabilizer, a rheological additive, a dispersing agent, a wetting agent and a defoaming agent, mixing at a low speed, uniformly stirring, adding a filler, and stirring at a medium-high speed for 5-20min to prepare a coarse mixed dispersion liquid.
(2) Grinding and dispersing: transferring the mixed dispersion liquid in the step (1) into grinding equipment, carrying out auxiliary grinding by zirconium beads with thinner particle size, and carrying out high-speed grinding for 40min until the fineness is less than or equal to 35 mu m, thus obtaining the required dispersion slurry.
S2, preparing an auxiliary agent:
(1) And (3) preparing a wear-resistant auxiliary agent: the wear-resistant auxiliary agent is diluted or dissolved into a state easy to be added by a certain proportion of cosolvent, and is stirred uniformly for standby.
(2) Preparing a thickening agent: diluting the thickener with a certain proportion of water (1:1) for standby.
S3, preparing a water-based paint:
(1) Stirring the dispersion slurry obtained in the step S1 at a medium-low speed, adding the rest equivalent water, and uniformly stirring; and (3) adding the polyurethane emulsion in a low-speed state, and stirring for about 10min until the polyurethane emulsion is uniformly stirred.
(2) And then adding the wear-resistant auxiliary agent prepared in the step S2, and stirring for 15min until the components are uniformly mixed.
(3) Then, shrink-proof Kong Chuji and other auxiliary agents are added in sequence and stirred uniformly.
(4) Finally, adding the thickener prepared in the step S2 to thicken for 10min, and thickening at medium and high speed; then the rest defoaming agent is thickened and defoamed for 5min by reducing the rotating speed; filtering, sealing and packaging.
Example 2
A water-based scratch-resistant protective coating for a rubber protective coating of a metal surface comprises the following components in parts by weight: 1 part of pigment, 45 parts of filler, 15 parts of acrylic resin, 25 parts of polyurethane emulsion, 0.1 part of PH stabilizer AMP-95, 0.3 part of N, N-dimethylethanolamine, 0.25 part of dispersing agent, 0.15 part of wetting agent, 0.2 part of defoamer, 0.6 part of cosolvent, 0.5 part of slipping agent, kong Chuji 0.3.3 parts of shrink prevention, 0.2 part of rheological additive, 0.3 part of other additive preservative, 0.5 part of antirust agent and the balance of water; the filler is barium sulfate; the acrylic resin is silicone-acrylic emulsion, and the polyurethane emulsion is aqueous polyurethane dispersion; the wetting agent is alkyl polyoxyethylene ether; the defoamer is polyether modified polydimethylsiloxane; the slipping agent is polydimethylsiloxane emulsion; the adhesion promoter is a silane coupling agent.
Wherein the PH stabilizer is multifunctional amine auxiliary agent AMP-95 and amine neutralizer N, N-dimethylethanolamine; the dispersing agent is an anionic wetting dispersing agent; the rheological additive is inorganic rheology; the cosolvent is ethylene glycol; the other auxiliary agents are preservative and antirust agents.
The preparation method of the water-based scratch-resistant protective coating comprises the following steps:
s1, preparing powder dispersion liquid:
(1) Premixing: adding 90% water into a dispersing container, sequentially adding a PH stabilizer, a rheological additive, a dispersing agent, a wetting agent and a defoaming agent, mixing at a low speed, uniformly stirring, adding a filler, and stirring at a medium-high speed for 5-20min to prepare a coarse mixed dispersion liquid.
(2) Grinding and dispersing: transferring the mixed dispersion liquid in the step (1) into grinding equipment, carrying out auxiliary grinding by zirconium beads with thinner particle size, and carrying out high-speed grinding for 40min until the fineness is less than or equal to 35 mu m, thus obtaining the required dispersion slurry.
S2, preparing an auxiliary agent:
(1) And (3) preparing a wear-resistant auxiliary agent: the slipping agent is diluted or dissolved into a state easy to be added by a certain proportion of cosolvent, and is stirred uniformly for standby.
S3, preparing a water-based paint:
(1) Stirring the dispersion slurry obtained in the step S1 at a medium-low speed, adding the rest equivalent water, and uniformly stirring; and adding the acrylic resin and the polyurethane emulsion in a low-speed state, and stirring for about 10min until the mixture is uniformly stirred.
(2) Then, adding the smooth reagent prepared by the S2, and stirring for 15min until the mixture is uniformly mixed.
(3) Then, shrink-proof Kong Chuji, adhesion promoter and other auxiliary agents are added in sequence and stirred uniformly.
(4) Finally, adding the rest defoamer, and defoaming for 5min at a low speed; filtering, sealing and packaging.
Example 3
A water-based scratch-resistant protective coating for a rubber protective coating of a metal surface comprises the following components in parts by weight: 1 part of pigment, 35 parts of filler, 10 parts of acrylic resin, 30 parts of polyurethane emulsion, 0.05 part of PH stabilizer AMP-95, 0.3 part of N, N-dimethylethanolamine, 0.25 part of dispersing agent, 0.15 part of wetting agent, 0.4 part of defoamer, 0.6 part of cosolvent, 0.4 part of slipping agent, kong Chuji 0.3.3 parts of shrink prevention, 0.2 part of rheological additive, 0.3 part of other additive preservative and the balance of water; the filler is talcum powder; the acrylic resin is silicone-acrylic emulsion, and the polyurethane emulsion is aqueous polyurethane dispersion; the wetting agent is alkyl polyoxyethylene ether; the defoamer is a dispersion of polyether modified polydimethylsiloxane and polysiloxane; the slipping agent is polydimethylsiloxane emulsion; the adhesion promoter is a silane coupling agent.
Wherein the PH stabilizer is multifunctional amine auxiliary agent AMP-95 and amine neutralizer N, N-dimethylethanolamine; the dispersing agent is an anionic wetting dispersing agent; the rheological additive is bentonite; the cosolvent is ethylene glycol; the other auxiliary agent is preservative.
The preparation method of the water-based scratch-resistant protective coating comprises the following steps:
s1, preparing powder dispersion liquid:
(1) Premixing: adding 80% water into a dispersing container, sequentially adding a PH stabilizer, a rheological additive, a dispersing agent, a wetting agent and a defoaming agent, mixing at a low speed, uniformly stirring, adding a filler, and stirring at a medium-high speed for 5-20min to prepare a coarse mixed dispersion liquid.
(2) Grinding and dispersing: transferring the mixed dispersion liquid in the step (1) into grinding equipment, carrying out auxiliary grinding by zirconium beads with thinner particle size, and carrying out high-speed grinding for 40min until the fineness is less than or equal to 35 mu m, thus obtaining the required dispersion slurry.
S2, preparing an auxiliary agent:
(1) And (3) preparing a wear-resistant auxiliary agent: the slipping agent is diluted or dissolved into a state easy to be added by a certain proportion of cosolvent, and is stirred uniformly for standby.
S3, preparing a water-based paint:
(1) Stirring the dispersion slurry obtained in the step S1 at a medium-low speed, adding the rest equivalent water, and uniformly stirring; and adding the acrylic resin and the polyurethane emulsion in a low-speed state, and stirring for about 10min until the mixture is uniformly stirred.
(2) Then, adding the smooth reagent prepared by the S2, and stirring for 15min until the mixture is uniformly mixed.
(3) Then, shrink-proof Kong Chuji, adhesion promoter and other auxiliary agents are added in sequence and stirred uniformly.
(4) And finally, adding the rest defoamer, defoaming for 5min at a low speed, filtering, and sealing and packaging.
Comparative example 1:
the conventional vulcanized nitrile rubber coating which is not subjected to special treatment is pressed and adhered on a metal plate, and the effects of scratch resistance, wear resistance, corrosion resistance and the like of the product are tested by using the vulcanized nitrile rubber coating as a control group.
In order to better demonstrate the scratch-resistant protective coating of the aqueous metal surface rubber coating prepared in the embodiment of the application, the aqueous coating of the above embodiments 1 to 3 was subjected to performance test on the surface of 150 x 70 x 0.28mm tinplate substrate (thickness 5 to 10 μm) treated with only the surface rubber coating with the thickness of 20 μm, and after being roll coated with a 30 μm wire rod, the surface was baked and cured in an oven at 160 ℃ for 5 minutes, and the test results are shown in table 1.
In practical use, the application also has protective effect on the surface of the metal material with the rubber layer falling off and damaged, in order to test the direct protective effect of the water-based metal surface rubber coating on the metal layer, the water-based paint of the embodiment 1-3 is directly coated on the surface of a tinplate substrate (with the thickness of 5-10 mu m) with the thickness of 150 x 70 x 0.28mm, and is baked and cured for 5 minutes in a 160 ℃ oven after being rolled on a 30 mu m coil bar, and the performance test is carried out together with the comparative example 1, and the test results are shown in the table 2.
Pencil hardness test: according to standard GB/T6739-96.
Shore hardness test: according to standard GB/T531.1-2008.
Adhesion test: the cross-hatch method is carried out according to GB/T9286-98.
Abrasion performance test: according to standard GB/T1689-2014.
Abrasion resistance test: and (3) adopting 0000# steel wool, loading 1kg, and carrying out back and forth 30 times to observe whether a paint film has obvious scratches or not.
Bending adhesion test: curing for 7d according to 23+/-2 ℃ and RH 50+/-5%, bending for 10 times at a bending angle of 180 ℃ during testing, and observing the cracking condition of the coating in the bending area.
And (3) adhesive strength test: the paint is coated on a steel plate with the same material not less than 3mm, maintained for 7 days at 23+/-2 ℃ and RH 50+/-5%, and the test method is carried out according to the standard GB/T5210-2006.
Oil resistance test: according to HG/T3345-1985.
Table 1 shows the results of the performance test of the rubber coating applied to the surface of the metal sheet in examples 1-3:
TABLE 1
Table 2 shows the coating performance test results of the metal base plates coated in comparative example 1 and examples 1 to 3:
TABLE 2
From the above performance test results, it is possible to obtain: the coating properties of the coatings of examples 1 to 3 are better, especially example 3, the talcum powder is used as the filler, the polydimethylsiloxane emulsion is used as the slipping agent, the adhesive force and the friction resistance are better than those of other examples, and the water-based metal surface rubber coating scratch-resistant protective coating disclosed by the application has certain hardness, has better adhesive force and excellent scratch resistance, and is excellent in flex resistance, smooth in hand feeling and excellent in protective effect.
The foregoing description of the preferred embodiments of the application is not intended to limit the application to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the application.

Claims (10)

1. The water-based scratch-resistant protective coating is characterized by being used for a rubber protective coating of a metal surface, and comprises the following raw material components in parts by weight: base material: 0-10 parts of pigment, 5-50 parts of filler and 0-45 parts of polyurethane emulsion;
0.1-0.5 part of PH stabilizer, 0.1-0.5 part of dispersing agent or 0-0.7 part of wetting dispersing agent, 0-1 part of wetting agent, 0.1-1 part of defoamer, 0-5 part of cosolvent, 0-3 parts of wear-resistant auxiliary agent or 0-5 part of slipping agent, 0-2 parts of shrink-proof Kong Chuji, 0-5 part of adhesion promoter, 0.1-0.5 part of rheological auxiliary agent or 0-0.5 part of anti-settling agent, 0-2 parts of thickening agent and 0-1 part of other auxiliary agents.
2. The aqueous scratch resistant protective coating of claim 1, wherein the metal surface has a rubber protective coating thickness of 5 to 50 μm.
3. The aqueous scratch resistant protective coating according to claim 1 or 2, wherein the raw materials of the aqueous scratch resistant protective coating further comprise 0-30 parts of acrylic resin, wherein the acrylic resin is silicon modified acrylic resin and/or silicon modified styrene-acrylic emulsion, and the polyurethane emulsion is aqueous polyurethane dispersion.
4. The aqueous scratch resistant protective coating of claim 1 or 2, wherein the pigment is at least one of titanium dioxide, carbon black, phthalocyanine blue or color paste, and the filler is one or more of barium sulfate, quartz powder, silica fume, talcum powder, mica powder or zinc stearate; the PH stabilizer is a multifunctional amine auxiliary agent and/or an amine neutralizer; the dispersing agent or wetting dispersing agent is one or more of an acrylic acid amine salt dispersing agent, an anionic wetting dispersing agent or a cationic wetting dispersing agent; the wetting agent is one or more of alkyl polyoxyethylene ether, modified silicone oil, modified polyorganosiloxane and polyether modified dimethyl siloxane.
5. The aqueous scratch resistant protective coating of claim 1 or 2, wherein the defoamer is one or more of polyether modified polydimethylsiloxane, modified polyorganosiloxane, or nonylphenol polyoxyethylene ether; the cosolvent is water and/or polyalcohol substances; the slipping agent and the wear-resistant auxiliary agent are one or more of gas silicon, modified wax powder, polyethylene wax emulsion, organosilicon wear-resistant slipping agent, polydimethylsiloxane emulsion, polysiloxane or polysiloxane crosslinked polymer dispersoid and the like; the shrink-proof Kong Chuji is organofluorine modified polyorganosiloxane; the adhesion promoter is a silane coupling agent.
6. The aqueous scratch resistant protective coating of claim 1 or 2, wherein the anti-settling agent or rheological aid is one or more of a cellulosic leveling agent, an inorganic rheological agent, a magnesium aluminum silicate thixotropic lubricant, bentonite, an acrylic polymer, or a polyether modified dimethylsiloxane; the thickener is one or more of a modified association type alkali swelling thickener or a polyurethane PU thickener.
7. The aqueous scratch resistant protective coating of claim 1 or 2, wherein the other adjuvants include preservatives, bactericides and rust inhibitors.
8. The preparation method of the water-based scratch-resistant protective coating is characterized by comprising the following steps of:
(1) Preparing a powder dispersion liquid: at least one of PH stabilizer, rheological additive or anti-settling agent, at least one of dispersing agent or wetting dispersing agent, wetting agent and defoamer 1/3-2/3 are added into the solution in turn for dispersion, pigment and filler are added for stirring and grinding, and powder dispersion liquid is obtained;
(2) Preparing an auxiliary agent: preparing a slipping agent, an abrasion-resistant auxiliary agent and a thickening agent into a solution;
(3) Preparing a coating: adding acrylic resin and polyurethane emulsion into the powder dispersion liquid obtained in the step (1), uniformly stirring, adding the slipping agent and the wear-resistant auxiliary agent solution prepared in the step (2), and uniformly stirring; sequentially adding the shrinkage-preventing auxiliary agent, the adhesion promoter and other auxiliary agents, and uniformly stirring; and (3) finally adding the thickener prepared in the step (2), stirring, adding the residual defoamer, stirring and filtering to obtain the water-based scratch-resistant protective coating.
9. The method according to claim 8, wherein the stirring in the step (1) is medium-high speed 1200-3000r stirring for 5-20min, and the grinding is auxiliary grinding with glass beads, alumina, silicon carbide or zirconium beads with thinner particle size, and high-speed grinding for 30-60min until the fineness is less than or equal to 35 μm.
10. The method according to claim 8, wherein the acrylic resin and polyurethane emulsion are added into the powder dispersion liquid in the step (3), and the slipping agent and the wear-resistant auxiliary agent solution are added, and stirred for 10-15min; stirring the added and prepared thickening agent at a medium-high speed of 800-2000r for 10-20min; and adding the residual defoaming agent, stirring and filtering, and stirring at a low speed of 200-800r for 5-10min.
CN202310663604.3A 2023-06-06 2023-06-06 Water-based scratch-resistant protective coating and preparation method thereof Pending CN116769389A (en)

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CN110054941A (en) * 2018-01-17 2019-07-26 科思创德国股份有限公司 Monocomponent waterborne polyurethane coating composition and preparation method thereof
CN112795250A (en) * 2020-12-10 2021-05-14 扬州郎康汽车水性涂料有限公司 Water-based anticorrosive paint and preparation method thereof
CN113337199A (en) * 2021-07-20 2021-09-03 山东七维新材料有限公司 Coating for rubber base material and preparation method thereof
CN113773738A (en) * 2021-09-13 2021-12-10 陈正林 Automobile sealing strip front end spraying coating and preparation method thereof
CN114854288A (en) * 2022-05-24 2022-08-05 桂林荔浦衣美达家居用品有限公司 Double-component hand-feeling elastic coating sprayed on metal household articles and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107793903A (en) * 2017-09-26 2018-03-13 中车青岛四方机车车辆股份有限公司 A kind of coating composition and its application for being used to repair rubber floor covering cloth
CN110054941A (en) * 2018-01-17 2019-07-26 科思创德国股份有限公司 Monocomponent waterborne polyurethane coating composition and preparation method thereof
CN112795250A (en) * 2020-12-10 2021-05-14 扬州郎康汽车水性涂料有限公司 Water-based anticorrosive paint and preparation method thereof
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CN113773738A (en) * 2021-09-13 2021-12-10 陈正林 Automobile sealing strip front end spraying coating and preparation method thereof
CN114854288A (en) * 2022-05-24 2022-08-05 桂林荔浦衣美达家居用品有限公司 Double-component hand-feeling elastic coating sprayed on metal household articles and preparation method thereof

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