CN109266152A - A kind of repairing coating composition and its application method - Google Patents

A kind of repairing coating composition and its application method Download PDF

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Publication number
CN109266152A
CN109266152A CN201810911140.2A CN201810911140A CN109266152A CN 109266152 A CN109266152 A CN 109266152A CN 201810911140 A CN201810911140 A CN 201810911140A CN 109266152 A CN109266152 A CN 109266152A
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coating
coating composition
acrylic resin
repairing
film
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CN201810911140.2A
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CN109266152B (en
Inventor
李翠芝
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Foshan Balong Vehicle Parts Technology Co ltd
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Ningbo Leather Innovation Mstar Technology Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/63—Additives non-macromolecular organic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/65—Additives macromolecular
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)

Abstract

The present invention provides a kind of surface of vehicle repairing coating compositions of environmental protection, the coating composition is chosen by unique ingredient and preferred component proportion realizes the coating composition has convenient for carrying out coating in surface of vehicle breakage and repairing excellent coating performance, simultaneously convenient for storage, and have both excellent wear-resisting, anti-corrosion, weather-proof and aesthetics.Surface of vehicle repairing coating composition of the present invention includes urethane methacylate resins 15-20%, acrylic resin 15-20%, polyisocyanates 3-7%, ethyl acetate 30-35%, hexahydrotoluene 15-20%, methylisobutylketone 5-10%, pigment 1-5%, ultraviolet absorbing agent 2-5%, light stabilizer 1-2%.

Description

Coating composition for repairing and using method thereof
Technical Field
The invention relates to the technical field of vehicle coating, in particular to a coating composition for repairing a damaged part on the surface of a vehicle and a using method thereof.
Background
A conventional coated vehicle component is composed of a vehicle component material, a primer coat (primer coat) formed on the vehicle component material, a base coat (base coat) formed on the primer coat, and a clear coat (clear coat) formed on the base coat. Wherein the primer layer has a thickness of about 8 μm; the base coat is typically a pigmented paint layer, about 20 μm thick; the clear coat is typically a high gloss layer formed from clear paint and has a thickness of about 30 μm.
Vehicle parts are generally molded and manufactured from polyolefins including polypropylene and the like. Polyolefin resins such as polypropylene are poor materials in adhesion because of their nonpolar material characteristics. Therefore, in order to improve the adhesion of polyolefin resins such as polypropylene, a primer layer is formed on the vehicle component material to improve the adhesion between the vehicle component material and various coating layers, and the primer layer is generally formed of chlorinated polyolefin resins or the like. And the base coat on the surface of the primer layer is a coating for coloring the vehicle parts, and generally includes acrylic resin, urethane resin, pigment, and the like. The clear coat layer is intended to give good appearance to vehicle parts, to provide high gloss to vehicle parts, and to enhance coating film reliability, and often contains an acrylic resin and a polyester resin as main components, and may further contain a diisocyanate such as 3-functional hexamethylene diisocyanate as a hardener, and the like.
With the rapid development of the automobile industry and the increasing popularity of automobile ownership and use by ordinary consumers, the number of automobiles is increasing, and the demand for paint for automobile surface coating is increasing. Among them, the automobile paint used for decorating and protecting the surface of the automobile becomes an important development product in the coating industry of China. The automobile coating paint comprises original factory paint and repair paint, wherein the repair paint is mainly used for repairing scratches, damages, falling off and the like of an automobile surface coating to an original state, and partially refitting and renovating the whole automobile.
In the daily production and life of actual use, the surface of an automobile is easily damaged by sand blown and crushed stones, scratches, small pits and other scratches are easily formed on the surface of the automobile paint, the overall attractiveness of the automobile is affected, and the risk of further corrosion is increased. Therefore, compared with the original factory paint which is not used for automobile repair coating, the repair paint can be developed very quickly and has wider application prospect. Based on the use of refinish paints, it is generally required to provide a protective decorative coating on automotive surfaces, particularly scratch-off damage, and to provide fullness, gloss, while also having certain abrasion and weather resistance to avoid re-exposure of the refinish. Meanwhile, the refinishing paint is required to have quick-drying performance due to the coating process of the refinishing paint, is often insufficient in the aspects of wear resistance, corrosion resistance, weather resistance and the like, and is difficult to resist poor air quality environment and repeated washing of the car washing alkaline liquid.
The invention aims to provide an environment-friendly coating composition for repairing the surface of a vehicle, which has good coating performance, excellent wear resistance, corrosion resistance and weather resistance and attractive appearance, and a using method thereof.
Disclosure of Invention
The invention aims to provide an environment-friendly coating composition for repairing the surface of a vehicle, which realizes that the coating composition has good coating performance for coating and repairing the damaged part of the surface of the vehicle through unique component selection and optimal component proportion, is convenient to store, and has excellent wear resistance, corrosion resistance, weather resistance and aesthetic property.
In order to achieve the purpose, the invention adopts the following technical scheme:
a coating composition for repairing a vehicle surface, characterized in that: the coating composition comprises 15-20% of polyurethane methacrylate resin, 15-20% of acrylic resin, 3-7% of polyisocyanate, 30-35% of ethyl acetate, 15-20% of methylcyclohexane, 5-10% of methyl isobutyl ketone, 1-5% of pigment, 2-5% of ultraviolet absorber and 1-2% of light stabilizer.
Preferably, the urethane methacrylate has 9 or more acryl groups.
Preferably, the acrylic resin is a macromonomer of polymethyl methacrylate and a polymer of 2-hydroxyethyl acrylate.
Preferably, the mass ratio of the macromonomer of the polymethyl methacrylate to the 2-hydroxyethyl acrylate is 1: 5-5.5.
Preferably, the number average molecular weight of the macromonomer of the polymethyl methacrylate is preferably 2000-3500, and the weight average molecular weight of the acrylic resin is preferably 25 to 30 ten thousand.
Preferably, the polyisocyanate is hexamethylene diisocyanate.
The invention also aims to provide a coating film forming using method of the coating composition for repairing the surface of the vehicle, which comprises the following steps:
1) fully stirring the coating composition to uniformly mix all the components;
2) uniformly coating the surface to be repaired with the coating composition by adopting an air spraying process, and then standing;
3) after coating, the coating film is dried by hot air;
4) after drying, the coating film is subjected to ultraviolet curing treatment.
Preferably, the thickness of the coating film is 40 to 60 μm.
Preferably, standing for 5-10min after coating; hot air drying at 50-60 deg.C for 5-10 min; the ultraviolet wavelength of the ultraviolet curing treatment is 380nm, the irradiation distance is 15-20cm, and the irradiation energy is 800-2And the curing time is 5-10 min.
The coating composition and the using method thereof have the beneficial effects that: the environment-friendly coating composition has excellent coating performance by adopting unique component design and optimized component proportion content, and after a film is formed by a corresponding simple and convenient process, a coating film has excellent wear resistance, corrosion resistance, weather resistance and film forming attractiveness.
Detailed Description
Example 1
Firstly, a coating composition is prepared, wherein the coating composition comprises 15% of polyurethane methacrylate resin, 20% of acrylic resin, 3% of polyisocyanate, 30% of ethyl acetate, 15% of methylcyclohexane, 10% of methyl isobutyl ketone, 2% of pigment, 3% of ultraviolet absorber and 2% of light stabilizer. Wherein,
the urethane methacrylate has 9 acryl groups;
the acrylic resin is a polymer of a macromonomer of polymethyl methacrylate and 2-hydroxyethyl acrylate, wherein the number average molecular weight of the macromonomer of polymethyl methacrylate is 2500, the mass ratio of the macromonomer of polymethyl methacrylate to 2-hydroxyethyl acrylate is 1:5, and the weight average molecular weight of the acrylic resin obtained after polymerization is 25 ten thousand;
the polyisocyanate is hexamethylene diisocyanate;
the pigment comprises scale-shaped metal and cellulose ether;
the ultraviolet absorbent comprises benzotriazole and nano titanium oxide;
the light stabilizer is a hindered amine light stabilizer.
Preparing the components according to the mass ratio to obtain a coating composition, and fully stirring the coating composition to uniformly mix the components; then, uniformly coating the coating composition on a sample simulating the surface to be repaired by adopting an air spraying process until a 50-micrometer coating film is formed, and standing for 5 min; then, the coating film is dried by hot air for 5min at the temperature of 55 ℃; subsequently, ultraviolet rays having a wavelength of 380nm, 800/cm were used2The curing is carried out at a position of about 20cm for 5 min.
Examples 2 to 7 were conducted by adjusting the contents of the respective components, and the rest were the same as in example 1, and the specific content ratios are shown in table 1, wherein a to I in table 1 represent urethane methacrylate resin, acrylic resin, polyisocyanate, ethyl acetate, methylcyclohexane, methyl isobutyl ketone, pigment, ultraviolet absorber, and light stabilizer, respectively, in the present invention.
Urethane methacrylate resins having 12 acryl groups and only 5 acryl groups were selected in examples 8 to 9, and the rest were the same as in example 1.
The number average molecular weight of the macromonomer of the acrylic resin-forming polymethyl methacrylate selected for use in example 10 was 5000, the weight average molecular weight of the acrylic resin selected for use in example 11 was 35 ten thousand, and the mass ratio of the macromonomer of the polymethyl methacrylate to 2-hydroxyethyl acrylate in example 12 was 1:7, the remainder being the same as in example 1.
TABLE 1
A B C D E F G H I
1 15 20 3 30 15 10 2 3 2
2 20 15 5 30 15 10 1 2 2
3 15 15 5 35 15 10 2 2 1
4 15 15 6 30 20 8 2 2 2
5 15 15 3 33 20 10 1 2 1
6 20 20 5 30 15 5 1 2 2
7 12 13 2 35 20 13 1 3 1
The following experimental tests were carried out on samples of the coating films of the above coating compositions to obtain properties of the coating films formed by the coating compositions, and the results are shown in Table 2.
Firstly, testing the coating performance of a coating film
① adhesion property A sample simulating the surface to be repaired was a galvanized steel sheet substrate coated with an acrylic resin, the substrate coated with a coating film of the coating composition of the present invention was immersed in hot water at 80 ℃ for 5 hours, the coating film on the surface was divided into 100 small squares of 10mm by 10mm in a square arrangement at a spacing of 2mm, and then the surface of the coating film was closely adhered with an adhesive tape so as to have no air bubbles, and after being uniformly pressed and adhered with fingertips, the end of the adhesive tape was rapidly pulled in a direction of about 45 ° to separate the adhesive tape from the surface of the coating film, and then the number of intact small squares that were not peeled off from the surface of the substrate with the adhesive tape was visually recorded to evaluate the adhesion property.
② drying Property A surface coated with a coating film of the coating composition of the present invention which was cured by baking without irradiation was directly examined by touching with a fingertip, and if a coating adhered to the fingertip after touching, the drying property was considered to be poor (x), and if no coating adhered to the fingertip after touching, the drying property was considered to be good (○).
③ appearance of coating film when the surface coated with the coating film of the coating composition of the present invention was visually observed, the appearance was excellent with no unevenness of color and shade and no bubbles (○), the appearance was clear with no visible bubbles and with substantially uniform color and shade (△), and the appearance was poor with bubbles and with unevenness of color and shade (x).
Secondly, testing the corrosion resistance of the coating
The surface of a coating film coated with the coating composition of the invention is immersed in a solution with the temperature of 80 ℃ and the concentration of 1mol/LNaOH, kept for 2 hours, then taken out and cleaned, and measured by a gloss meter (60 ℃), the alkali resistance of the coating film is evaluated according to the gloss retention (%) before and after the experiment, the gloss retention is excellent (○), the gloss retention is good (△), the gloss retention is poor (x) and the gloss retention is good (70-90%).
Thirdly, testing the wear resistance and the scuff resistance of the coating film
A coating film surface coated with the coating composition of the present invention was left at 45 degrees, 500g of M4 nut was dropped from a straight pipe having a length of 2M and an inner diameter of 20mm at-20 ℃ to impact the coating film surface, and then the scratch resistance was evaluated by visually observing the damaged area of the coating film surface, with the peel area being less than 20% being excellent (○), the peel area being 20-60% being excellent (△), and the peel area exceeding 60% being poor (x).
TABLE 2
Adhesion Property Drying Property Appearance of the product Corrosion resistance Scratch resistance
1 100 ○ ○ △ ○
2 98 ○ △ ○ △
3 96 ○ △ △ △
4 100 ○ ○ △ △
5 95 × △ △ △
6 94 ○ × ○ △
7 90 × × × ×
8 100 ○ ○ ○ ○
9 99 ○ ○ × ○
10 96 ○ × ○ ×
11 92 ○ × △ ×
12 93 ○ △ ○ ×
The formulation of the coating system of the present invention is further illustrated below:
the polyurethane methacrylate resin in the coating has a large amount of acryloyl groups, so that the alkali resistance and the solvent resistance of the coating composition can be obviously improved, the corrosion resistance of car paint at a repaired position in the future car washing operation and other processes is improved, the integrity of a coating film is further kept, the service life is prolonged, in order to ensure that the polyurethane methacrylate resin plays the above role in a system, the content of the polyurethane methacrylate resin is required to be at least 15%, but the content of the polyurethane methacrylate resin is not too high, and the effect of other resins is influenced. Meanwhile, in order to secure sufficient corrosion resistance, at least 9 acryl groups in urethane methacrylate should also be secured.
The acrylic resin in the paint provided by the invention adopts a macromonomer of polymethyl methacrylate and a polymer of acrylic acid-2-hydroxyethyl ester, and has lower viscosity than common paint resin, so that good painting performance is obtained, in order to exert the effect of the acrylic resin, the content of the acrylic resin is at least 15%, but not too much, and the effect of other resins can be influenced when the content exceeds 20%; meanwhile, the coating film has excellent comprehensive performance of strength and ductility, so that the coating film has excellent wear resistance and scratch resistance, and in order to ensure that the acrylic resin can play the above role, the number average molecular weight of the macromonomer of polymethyl methacrylate is preferably 2000-3500. Meanwhile, the mass ratio of the macromonomer of the polymethyl methacrylate to the 2-hydroxyethyl acrylate is not too large, if the ratio is more than 1:5, although the coating has better wear resistance and good scratch resistance, the overall coating performance is poor, but the ratio cannot be too small, such as less than 1:5.5, otherwise the wear resistance and the scratch resistance of the coating cannot meet the requirements; further, the weight average molecular weight of the acrylic resin should be controlled to 25 to 30 ten thousand in consideration of the strength, ductility and coatability.
In the coating, hexamethylene diisocyanate can be used as a hardening agent, in order to ensure sufficient crosslinking and curing in the heating irradiation process and further ensure various performances such as wear resistance and corrosion resistance of a coating, the content of hexamethylene diisocyanate is at least 3%, the content of hexamethylene diisocyanate is not too high, and once the content of hexamethylene diisocyanate exceeds 7%, redundant hexamethylene diisocyanate which does not participate in reaction can influence the performances such as scratch resistance of the coating.
The main material of the solvent in the coating of the invention is ethyl acetate, which has excellent drying property and endows the coating composition with excellent coating performance, in order to make the ethyl acetate play the above role in the system, the content of the ethyl acetate should be at least 30%, but the addition amount should not be too large, and if the addition amount exceeds 35%, the appearance of the formed coating film is deteriorated.
The auxiliary material in the solvent in the coating is methylcyclohexane, the methylcyclohexane can effectively improve the coating adhesion capability of the coating composition on a primer and a finish paint during repairing, so that a repaired coating film has excellent adhesion and excellent appearance texture, the content of the methylcyclohexane is at least 15% in order to play the above role in a system, but the addition amount of the methylcyclohexane is not too high, and if the addition amount exceeds 20%, the coating performance of the coating composition is deteriorated.
The solvent in the coating of the invention also contains a certain proportion of methyl isobutyl ketone, the methyl isobutyl ketone can improve the coating performance of the coating composition and the storage time of the coating composition, in order to ensure that the methyl isobutyl ketone can play the role in the system, the content of the methyl isobutyl ketone is at least 5 percent, but the addition amount of the methyl isobutyl ketone is not too high, and if the methyl isobutyl ketone exceeds 10 percent, the appearance of a coating film is obviously and unevenly deteriorated due to larger resin dissolving capacity.
The solvent does not contain volatile organic compounds such as toluene, xylene and the like, has excellent drying and coating performances, has environmental protection and coating operability, and has good film-forming performance. The total solvent content is preferably more than 55%, so that the desired good coating properties can be obtained, but preferably not more than 60%, otherwise the drying properties and coating properties of the coating composition are deteriorated, and particularly it is difficult to obtain a thick coating film of about 50 μm.
In the present invention, in order to ensure sufficient weather resistance of the coating composition, a certain amount of ultraviolet absorber is added, wherein the ultraviolet absorber is preferably a mixture of organic ultraviolet absorber benzotriazole and inorganic ultraviolet absorber nano titanium oxide, and the content thereof is preferably more than 2% in order to ensure the efficacy thereof, but is preferably less than 5% in order not to affect the overall performance of the coating system.
The coating composition of the present invention is a coating material for repairing a vehicle surface, and in order to make a coating film of a corresponding color, a certain amount of a pigment may be added as necessary, and in order to secure gloss and uniformity, it is preferable that the pigment is a mixture of a scaly metal (e.g., a flaky alumina) and a cellulose ether, and the content thereof is preferably more than 1% as necessary, but in order not to affect the overall performance of the coating film system, it is preferable that the content thereof is less than 5%.
The coating composition of the invention is further added with a light stabilizer, preferably a common hindered amine light stabilizer, the addition of the light stabilizer can effectively improve the weather resistance of a coating film, the addition amount of the light stabilizer is preferably more than 1% in order to ensure the addition effect, but the content of the light stabilizer is controlled to be less than 2% in order not to influence the coating performance, the wear resistance, the scratch resistance and the like of the coating composition.
The coating composition of the present invention has excellent coating properties, and a coating film having excellent properties can be formed by simple air spray and ultraviolet radiation curing, but in order to ensure the excellent properties of the film formed by the coating composition of the present invention, when the coating composition is used for repairing a damaged portion of a vehicle surface, the coating composition should be dried at a temperature of 50 ℃ or higher for 5 minutes or more and 800mj/cm or more at least after the spray coating, and the coating composition should be cured by ultraviolet radiation curing2The ultraviolet radiation with the wavelength of 380nm is more than 5min, so that the coating can be fully dried, and a uniform, compact and firmly attached film layer can be formed. But care should be taken to avoid excessive crosslinking due to excessive heating and irradiation, which can affect film forming properties.
Although the present invention is illustrated by the above examples of the effect of the coating material of the present invention, the present invention is not limited to the above examples. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims (9)

1. A coating composition for repairing a vehicle surface, characterized in that: the coating composition comprises 15-20% of polyurethane methacrylate resin, 15-20% of acrylic resin, 3-7% of polyisocyanate, 30-35% of ethyl acetate, 15-20% of methylcyclohexane, 5-10% of methyl isobutyl ketone, 1-5% of pigment, 2-5% of ultraviolet absorber and 1-2% of light stabilizer.
2. The coating composition of claim 1, wherein: the urethane methacrylate has 9 or more acryl groups.
3. The coating composition of claim 1, wherein: the acrylic resin is a polymer of a macromonomer of polymethyl methacrylate and 2-hydroxyethyl acrylate.
4. The coating composition of claim 3, wherein: the mass ratio of the macromolecular monomer of the polymethyl methacrylate to the 2-hydroxyethyl acrylate is 1: 5-5.5.
5. The coating composition of claim 3, wherein: the number average molecular weight of the macromonomer of the polymethyl methacrylate is preferably 2000-3500, and the weight average molecular weight of the acrylic resin is preferably 25 to 30 ten thousand.
6. The coating composition of claim 1, wherein: the polyisocyanate is hexamethylene diisocyanate.
7. A method of using the coating composition for repairing a vehicle surface according to any one of claims 1 to 6 as a paint film, the method comprising:
1) fully stirring the coating composition to uniformly mix all the components;
2) uniformly coating the surface to be repaired with the coating composition by adopting an air spraying process, and then standing;
3) after coating, the coating film is dried by hot air;
4) after drying, the coating film is subjected to ultraviolet curing treatment.
8. Use according to claim 7, characterized in that: the thickness of the coating film is 40-60 mu m.
9. Use according to claim 7, characterized in that: standing for 5-10min after coating; hot air drying at 50-60 deg.C for 5-10 min; the ultraviolet wavelength of the ultraviolet curing treatment is 380nm, the irradiation distance is 15-20cm, and the irradiation energy is 800-2And the curing time is 5-10 min.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110330894A (en) * 2019-03-20 2019-10-15 台州学院 A kind of preparation method of the Automobile paint for automotive scratch reparation

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