CN114871075B - Method for repairing automobile paint - Google Patents
Method for repairing automobile paint Download PDFInfo
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- CN114871075B CN114871075B CN202210639653.9A CN202210639653A CN114871075B CN 114871075 B CN114871075 B CN 114871075B CN 202210639653 A CN202210639653 A CN 202210639653A CN 114871075 B CN114871075 B CN 114871075B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
- B05D3/0263—After-treatment with IR heaters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/584—No clear coat specified at least some layers being let to dry, at least partially, before applying the next layer
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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
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2301/00—Inorganic additives or organic salts thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2320/00—Organic additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2350/00—Pretreatment of the substrate
- B05D2350/30—Change of the surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2502/00—Acrylic polymers
Abstract
The present disclosure relates to a method of repairing automotive paint, the method comprising (1) spraying a first topcoat at an automotive paint damage location to form a first topcoat layer; spraying a second finish paint on the first finish paint layer to form a second finish paint layer; spraying a third finish paint on the second finish paint layer to form a third finish paint layer; (2) Spraying the filler at the junction of the original paint and the third paint layer, and baking and polishing after the filler is dried. According to the method, a first finishing paint with a specific composition is sprayed before a second finishing paint is sprayed, the excessive varnish in the first finishing paint is higher than the varnish curing agent, so that part of the varnish in the first finishing paint is cured first, and the rest of the uncured varnish can react with the varnish curing agent in a third finishing paint to crosslink, so that intermolecular hydrogen bonds are increased, the adhesive force of the second finishing paint is increased, and the mechanical strength of a paint surface is increased; polishing by adopting a port thinner, so as to reduce the color difference of the paint repairing; the method is environment-friendly and economical, has simple operation steps, and has strong applicability and popularization.
Description
Technical Field
The present disclosure relates to the field of automotive paint technology, and in particular, to a method for repairing automotive paint.
Background
The automobile is a transportation means in daily life of people, along with the continuous improvement of the living standard of people, the possession of private cars is also increased year by year, vehicles on urban streets and lanes are increased more and more, the following driving safety problems are increased more and more, small rubs are even more numerous, and the small rubs can cause damage to the paint surfaces of the vehicles, so that the appearance is influenced.
Whether in a host factory or a 4S shop, the repair of the automobile paint always has the problem of chromatic aberration, particularly the problem of the color difference of the metal paint, and the spraying effect is different under the same environment and different process technologies; the same technological method and the sprayed effect are different under different environmental operations, and the phenomenon of unqualified adhesive force is easy to occur in the repair of the metallic paint, so that poor repair is caused, secondary repair is needed, and the use of the vehicle is seriously affected.
Disclosure of Invention
The method is environment-friendly and economical, has simple operation steps, can increase the mechanical strength and adhesive force of a paint surface, and solves the problems of larger repair chromatic aberration and poorer adhesive force of metallic paint.
The present disclosure provides a method of repairing automotive paint, the method comprising the steps of:
(1) Spraying a first finish paint on the damaged part of the vehicle paint to form a first finish paint layer; spraying a second finish paint on the first finish paint layer to form a second finish paint layer; spraying a third finish paint on the second finish paint layer to form a third finish paint layer;
(2) Spraying a port thinner at the junction of the original paint and the third paint layer, and baking and polishing after the port thinner is dried;
wherein the first and third topcoats each comprise a varnish and a varnish curing agent, and the port-plugging thinner comprises an acrylic polyurethane;
the mass ratio of the varnish to the varnish curing agent in the first finishing coat is (8-14): 1.
alternatively, the varnish is an acrylate varnish, preferably a hydroxy acrylic resin varnish, the varnish curing agent comprising isocyanate, xylene, n-butyl acetate and 1-methoxy-2-propyl acetate;
the content of isocyanate is 80-85 wt%, the content of dimethylbenzene is 1-2 wt%, the content of n-butyl acetate is 5-10 wt% and the content of acetic acid-1-methoxy-2-propyl ester is 2-3 wt% based on the total weight of the varnish curing agent.
Optionally, the mass ratio of isocyanate to n-butyl acetate in the varnish curing agent is (8-16): 1, wherein the mass ratio of the isocyanate to the acetic acid-1-methoxy-2-propyl ester is (33-50): 1.
optionally, the mass ratio of the varnish to the varnish curing agent in the first finishing coat is (9-11): 1, a step of; the mass ratio of the varnish to the varnish curing agent in the third finishing coat is (1-3): 1.
optionally, the second topcoat is selected from solvent-borne base paints including metallic base paints or pearl base paints including hydroxy acrylic resins, pigments, silver paste powders and organic diluents.
Optionally, the method further comprises: before the step (1), polishing the damaged part of the vehicle paint; optionally, the polishing process includes: firstly polishing the damaged part of the vehicle paint by using 800-1000 meshes of sand paper, and secondly polishing the damaged part of the vehicle paint by using 1500-2000 meshes of sand paper; wherein the area of the second polish exceeds the area of the first polish.
Optionally, the construction viscosity of the first finishing paint at 25 ℃ is 14-16 s, and the film thickness of the first finishing paint layer is 3-5 mu m; the construction viscosity of the second finishing paint is 14-17 s at 25 ℃, and the film thickness of the second finishing paint layer is 15-25 mu m; the construction viscosity of the third finishing paint is 16-18 s at 25 ℃, and the film thickness of the third finishing paint layer is 30-45 mu m.
Optionally, the spraying method of the first top coat in the step (1) includes: spraying 2-3 layers of first finish paint at the temperature of 20-25 ℃ and the humidity of 50-65%, standing and flashing for 5-10 min after each layer of first finish paint is sprayed, and then spraying the next layer;
the spraying method of the second finishing paint comprises the following steps: after the surface of the first finish paint layer is dried, spraying 2-3 layers of second finish paint under the conditions that the temperature is 20-25 ℃ and the humidity is 50-65%, standing and flashing for 10-15 min after each layer of second finish paint is sprayed, and then spraying the next layer;
the spraying method of the third finishing paint comprises the following steps: after the second finish paint layer is dried, 2-3 layers of third finish paint are sprayed at the temperature of 20-25 ℃ and the humidity of 50-65%, and each layer is sprayed, kept stand and flash dried for 5-10 min, and then the next layer is sprayed.
Optionally, the spraying conditions of the port diluent in step (2) include: spraying after the third finishing paint is sprayed for 3-5 minutes;
the baking conditions include: baking at a position 60-90 cm away from the repair paint surface by using an infrared baking lamp, wherein the baking temperature is 80-100 ℃ and the baking time is 15-25 min.
Optionally, the first finish paint, the second finish paint and the third finish paint are sprayed by adopting spray guns, the spray guns are down-pressing spray guns, the diameter of spray gun nozzles is 1.3-1.4 mm, and the air pressure of the spray guns is 0.18-0.3 Mpa.
According to the technical scheme, the method comprises the steps of spraying a first finishing paint with a specific composition before spraying a second finishing paint, and then spraying the second finishing paint and a third finishing paint, wherein the excessive varnish in the first finishing paint is larger than the varnish curing agent, so that part of the varnish in the first finishing paint is cured first, and the residual uncured varnish can react with the varnish curing agent in the third finishing paint to crosslink, so that intermolecular hydrogen bonds are increased, the adhesive force of the second finishing paint is increased, and the mechanical strength of a paint surface is increased; polishing by adopting a port thinner, so as to reduce the color difference of the paint repairing; the method is environment-friendly and economical, has simple operation steps, and has strong applicability and popularization.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a picture of the effect of the paint film cross-hatch test of example 2;
FIG. 2 is a picture of the effect of the paint film cross-hatch test of example 3;
FIG. 3 is a picture of the effect of the paint film cross-hatch test of comparative example 1;
FIG. 4 is a picture of the effect of the paint film cross-hatch test of comparative example 2;
FIG. 5 is a picture of the effect of the paint film cross-hatch test of comparative example 3.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
The present disclosure provides a method of repairing automotive paint, the method comprising the steps of:
(1) Spraying a first finish paint on the damaged part of the vehicle paint to form a first finish paint layer; spraying a second finish paint on the first finish paint layer to form a second finish paint layer; spraying a third finish paint on the second finish paint layer to form a third finish paint layer;
(2) Spraying a port thinner at the junction of the original paint and the third paint layer, and baking and polishing after the port thinner is dried;
wherein the first and third topcoats each comprise a varnish and a varnish curing agent, and the port-plugging thinner comprises an acrylic polyurethane;
the mass ratio of the varnish to the varnish curing agent in the first finishing coat is (8-14): 1.
in the above technical solution, the present disclosure provides a method for repairing an automotive paint, which includes spraying a first top coat with a specific composition before spraying a second top coat, and then spraying the second top coat and a third top coat, wherein a varnish in the first top coat is in excess of a varnish curing agent, so that a part of varnish in the first top coat is cured first, and the remaining uncured varnish can react with the varnish curing agent in the third top coat to crosslink, thereby increasing intermolecular hydrogen bonds and increasing adhesion of the second top coat; the edge part of the paint repairing is sprayed by adopting the port thinner, so that the color difference of the paint repairing can be reduced; the preparation method is environment-friendly and economical, has simple operation steps, and has stronger applicability and popularization.
In one embodiment of the present disclosure, the varnish is an acrylate varnish, preferably a hydroxy acrylic resin varnish, the varnish curing agent comprising isocyanate, xylene, n-butyl acetate and 1-methoxy-2-propyl acetate; the content of isocyanate is 80-85 wt%, the content of dimethylbenzene is 1-2 wt%, the content of n-butyl acetate is 5-10 wt% and the content of acetic acid-1-methoxy-2-propyl ester is 2-3 wt% based on the total weight of the varnish curing agent. In the embodiment, the varnish and the varnish curing agent with the preferred components are selected, so that the dispersibility of the first finish paint is good, the fusion of the paint film during large-area construction is facilitated, and the connection port is smooth.
In one embodiment of the present disclosure, the mass ratio of isocyanate to n-butyl acetate in the varnish curing agent is (8 to 16): 1, wherein the mass ratio of the isocyanate to the acetic acid-1-methoxy-2-propyl ester is (33-50): 1. in the embodiment, the cleaning curing agent with the preferable proportion is selected, so that the curing of the varnish can be accelerated, and the next reaction can be facilitated.
In one embodiment of the present disclosure, the mass ratio of the varnish to the varnish curing agent in the first topcoat is (9 to 11): 1, a step of; the mass ratio of the varnish to the varnish curing agent in the third finishing coat is (1-3): 1. in the above embodiment, the first top coat and the third top coat in the preferred ratio are selected to facilitate the cross-linking of the excess uncured varnish in the first top coat and the varnish curing agent in the third top coat, thereby increasing the adhesion of the second top coat.
In one embodiment of the present disclosure, the second topcoat is selected from solvent-borne base paints, including metallic base paints or pearl base paints, including hydroxy acrylic resins, pigments, silver paste powders, and organic diluents.
In one embodiment of the present disclosure, the method further comprises: before the step (1), polishing the damaged part of the vehicle paint; optionally, the polishing process includes: firstly polishing the damaged part of the vehicle paint by using 800-1000 meshes of sand paper, and secondly polishing the damaged part of the vehicle paint by using 1500-2000 meshes of sand paper; wherein the area of the second polishing exceeds the area of the first polishing, i.e. the second polishing comprises polishing the edge of the damaged part of the paint. In the embodiment, the vehicle paint damage position and the damage edge are polished, so that the joint is smooth, the subsequent polishing treatment is convenient, the consistency of the colors of the new paint and the old paint is facilitated, and the color difference of the paint is reduced.
In one embodiment of the disclosure, the first topcoat has a construction viscosity of 14 to 16s at 25 ℃ and a film thickness of 3 to 5 μm; the construction viscosity of the second finishing paint is 14-17 s at 25 ℃, and the film thickness of the second finishing paint layer is 15-25 mu m; the construction viscosity of the third finishing paint is 16-18 s at 25 ℃, and the film thickness of the third finishing paint layer is 30-45 mu m. In the embodiment, the first finishing paint, the second finishing paint and the third finishing paint with the preferable viscosity are selected, so that the first finishing paint, the second finishing paint and the third finishing paint are favorable for diffusion after spraying, the thickness of a cured finishing paint layer is thinner, and the color difference between the make-up paint and the base paint is convenient to control; the first finish paint layer, the second finish paint layer and the third finish paint layer with preferable film thickness are selected, so that crosslinking among finish paint molecules is facilitated, the finish paint is quickly dried, and the mechanical strength, the adhesive force and the gloss fullness of the finish paint are improved.
In one embodiment of the present disclosure, the spraying method of the first top coat in the step (1) includes: spraying 2-3 layers of first finish paint at the temperature of 20-25 ℃ and the humidity of 50-65%, standing and flashing for 5-10 min after each layer of first finish paint is sprayed, and then spraying the next layer; the spraying method of the second finishing paint comprises the following steps: after the surface of the first finish paint layer is dried, spraying 2-3 layers of second finish paint under the conditions that the temperature is 20-25 ℃ and the humidity is 50-65%, standing and flashing for 10-15 min after each layer of second finish paint is sprayed, and then spraying the next layer; the spraying method of the third finishing paint comprises the following steps: after the second finish paint layer is dried, 2-3 layers of third finish paint are sprayed at the temperature of 20-25 ℃ and the humidity of 50-65%, and each layer is sprayed, kept stand and flash dried for 5-10 min, and then the next layer is sprayed. In the embodiment, the spraying method is preferable, so that the sprayed finish paint can flash quickly, and the paint adhesion is improved.
In one embodiment of the present disclosure, the spraying conditions of the port diluent in step (2) include: spraying after the third finishing paint is sprayed for 3-5 minutes; the baking conditions include: baking at a position 60-90 cm away from the repair paint surface by using an infrared baking lamp, wherein the baking temperature is 80-100 ℃ and the baking time is 15-25 min. In the embodiment, the internal molecular diffusion movement of the port thinner is facilitated by selecting the preferable baking condition, so that local molecules are not easy to deform, and the hardness and toughness of the finish paint are improved.
In one embodiment of the disclosure, the first, second and third top coats are all sprayed by using a spray gun, the spray gun is a down-pressure spray gun, the diameter of the spray gun nozzle is 1.3-1.4 mm, and the air pressure of the spray gun is 0.18-0.3 Mpa. In the embodiment, the spraying is carried out by selecting a preferable spray gun, so that the spray is uniform and smooth, no granular feel is caused, and the paint color and luster are good.
According to the method for repairing the automobile paint, the first finishing paint with specific composition is sprayed before the second finishing paint is sprayed, and then the second finishing paint and the third finishing paint are sprayed, wherein the excessive varnish in the first finishing paint is higher than the varnish curing agent, so that part of the varnish in the first finishing paint is cured first, the rest of the uncured varnish can be crosslinked with the varnish curing agent in the third finishing paint, and the intermolecular hydrogen bonds are increased, so that the adhesive force of the second finishing paint is increased, and the mechanical strength of the paint surface is increased; polishing by adopting a port thinner, so as to reduce the color difference of the paint repairing; the method is environment-friendly and economical, has simple operation steps, and has strong applicability and popularization.
The present disclosure is further illustrated by the following examples and comparative examples, but the present disclosure is not thereby limited in any way.
In the following examples and comparative examples, the raw materials used were all commercially available products unless otherwise specified.
The varnish is CX926 acrylic polyurethane varnish produced by Hebei Feng Shuixing paint company;
the varnish curing agent is CX825H acrylic polyurethane finishing paint curing agent produced by Hebei Feng Shuixing paint company, inc.;
the solvent-based metallic primer is CX825T acrylic polyurethane paint diluent manufactured by Hebei Feng Shuixing paint company, inc.;
the filler is CX825T acrylic polyurethane paint diluent manufactured by Hebei Feng Shuixing paint company, inc.
Hardness test standard: pencil test for hardness of coating film of GB 6739-86;
adhesion test criteria: GB/T9286-1998 cross-hatch test of paint films for paints and varnishes;
finish paint construction viscosity test standard: GB/T1723-93;
paint film thickness test standard: GB/T1764-79.
Example 1
The commercial bus is adopted to repair the car paint, and the specific steps are as follows:
1. masking the parts which do not need to be sprayed with a protective film, masking paper or adhesive tape;
2. the old paint (slight scratch of the old paint or severe damage such as pits, etc. caused by color difference) of the damaged part of the commercial bus is polished by using 800-mesh sand paper, and the edges of the old paint and the old paint of the damaged part are polished by using 1500-mesh sand paper, wherein the polishing area range of the 800-mesh sand paper exceeds the spraying range of the metallic base paint, but cannot exceed the polishing range of the 1500-mesh sand paper;
3. spraying 2-3 layers of first finishing paint under the conditions that the temperature is 25 ℃ and the humidity is 65%, wherein the mass ratio of the varnish to the varnish curing agent in the first finishing paint is 10:1, after each layer is sprayed, standing and flashing for 5-10 min, and then spraying the next layer, wherein the construction viscosity of the first finish paint is 16s, and the film thickness of the formed first finish paint layer is 5 mu m;
4. after the surface of the first finish paint layer is dried, spraying 2-3 layers of solvent-type metallic base paint under the conditions that the temperature is 25 ℃ and the humidity is 65%, and after each layer is sprayed, standing and flashing for 10-15 min, spraying the next layer; the second finishing paint has a construction viscosity of 14s, the formed second finishing paint layer has a film thickness of 20 mu m, and the solvent-type metallic base paint is prepared from hydroxyl acrylic resin, imported pigment, imported silver paste, organic diluent and other materials.
5. After the surface of the second finishing paint layer is dried, spraying 2-3 layers of third finishing paint under the conditions that the temperature is 25 ℃ and the humidity is 65%, wherein the mass ratio of the varnish to the varnish curing agent in the third finishing paint is 2:1, after each layer is sprayed, standing and flashing for 15min, spraying the next layer, wherein the construction viscosity of the third finish paint is 16s, and the film thickness of the formed third finish paint layer is 30 mu m;
6. spraying acrylic polyurethane lapel thinner after finishing spraying the third finishing paint for 5 minutes, baking at 80cm of the repair paint surface by using an infrared baking lamp after finishing drying for 5 minutes, wherein the baking temperature is 80 ℃, the baking time is 25 minutes, and polishing for 24 hours after baking;
wherein the varnish comprises a hydroxyacrylic resin varnish, and the varnish curing agent comprises isocyanate, xylene, n-butyl acetate and 1-methoxy-2-propyl acetate; based on the total mass of the varnish curing agent, the content of isocyanate is 80-85 wt%, the content of dimethylbenzene is 1-2 wt%, the content of n-butyl acetate is 5-10 wt%, and the content of acetic acid-1-methoxy-2-propyl ester is 2-3 wt%; the mass ratio of isocyanate to n-butyl acetate in the varnish curing agent is (8-16): 1, the mass ratio of isocyanate to acetic acid-1-methoxy-2-propyl ester is (33-50): 1, a step of; the first finish paint, the second finish paint and the third finish paint are sprayed by adopting a spray gun, the spray gun is a down-pressing spray gun, the diameter of a spray gun nozzle is 1.3-1.4 mm, and the air pressure of the spray gun is 0.2Mpa;
paint film performance test: the hardness is more than or equal to H, the adhesive force is 0 level, the cutting edge is completely smooth, and no square layering exists.
Example 2
The same procedure as in example 1 is followed, with the only difference that: in the first finishing coat, the mass ratio of the varnish to the varnish curing agent is 8:1, a step of; paint film performance test: the hardness is equal to or higher than H, the adhesive force is 1 level, a small amount of coating is removed at the intersection of the cuts, but the cross cutting area is not affected by more than 5%, and the effect is shown in figure 1.
Example 3
The same procedure as in example 1 is followed, with the only difference that: the mass ratio of the varnish to the varnish curing agent in the third finishing coat is 3:1, a step of; paint film performance test: hardness is equal to or higher than H, adhesive force is 1 level, a small amount of coating is removed at the intersection of the cuts, but the cross cutting area is not affected by more than 5%, and the effect is shown in figure 2.
Comparative example 1
The same procedure as in example 1 is followed, with the only difference that: in the first finishing coat, the mass ratio of the varnish to the varnish curing agent is 7:1, a step of; paint film performance test: hardness is equal to or higher than HB, adhesion is 2 grades, the cross cutting area of the affected coating is 5-15%, and the effect is shown in figure 3.
Comparative example 2
The same procedure as in example 1 is followed, with the only difference that: the mass ratio of the varnish to the varnish curing agent in the first finishing coat is 15:1, a step of; paint film performance test: hardness is equal to or higher than H, adhesion is of grade 2, the cross cutting area of the affected coating is 5-15%, and the effect is shown in figure 4.
Comparative example 3
The same procedure as in example 1 is followed, with the only difference that: after polishing, directly spraying a metal base paint without spraying a first finish paint; paint film performance test: hardness is equal to or higher than H, adhesion is of grade 2, the cross cutting area of the affected coating is 5-15%, and the effect is shown in figure 5.
Test example:
the repair paints prepared in examples and comparative examples were used for the paint film cross-cut test, the test standard is GB/T9286-1998, cross-cut test of paint films of color paint and varnish, and the result analysis: the cut edges of example 1 were completely smooth without any grid delamination, some coating was removed at the cut intersections of examples 2-3, but the cross cut area was not affected by more than 5%, while the coating of comparative examples 1-3 was affected by 5-15%.
From the above, it can be seen that by adopting the method disclosed in examples 1 to 3, the repaired vehicle paint has smooth surface, can effectively reduce the chromatic aberration of vehicle body repair, can improve the repair efficiency, and the repaired metal paint has stronger applicability and popularization as the whole looks like particles having more stereoscopic impression, metallic impression and flicker degree.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure. In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (9)
1. A method of repairing automotive paint, the method comprising the steps of:
(1) Spraying a first finish paint on the damaged part of the vehicle paint to form a first finish paint layer; spraying a second finish paint on the first finish paint layer to form a second finish paint layer; spraying a third finish paint on the second finish paint layer to form a third finish paint layer;
(2) Spraying a port thinner at the junction of the original paint and the third paint layer, and baking and polishing after the port thinner is dried;
wherein the first and third topcoats each comprise a varnish and a varnish curing agent, and the port-plugging thinner comprises an acrylic polyurethane; the varnish is acrylate varnish, and the varnish curing agent comprises isocyanate, xylene, n-butyl acetate and acetic acid-1-methoxy-2-propyl ester; based on the total weight of the varnish curing agent, the content of isocyanate is 80-85 wt%, the content of dimethylbenzene is 1-2 wt%, the content of n-butyl acetate is 5-10 wt%, and the content of acetic acid-1-methoxy-2-propyl ester is 2-3 wt%;
the mass ratio of the varnish to the varnish curing agent in the first finishing coat is (9-11): 1, a step of; the mass ratio of the varnish to the varnish curing agent in the third finishing paint is (1-2): 1.
2. the method of claim 1, wherein the varnish is a hydroxy acrylic varnish.
3. The method according to claim 1, wherein the mass ratio of isocyanate to n-butyl acetate in the varnish curing agent is (8-16): 1, wherein the mass ratio of the isocyanate to the acetic acid-1-methoxy-2-propyl ester is (33-50): 1.
4. the method of claim 1, wherein the second topcoat is selected from solvent borne base paints, the solvent borne base paints comprising a metallic base paint or a pearl base paint, the metallic base paint comprising a hydroxy acrylic resin, a pigment, a silver paste powder, and an organic diluent.
5. The method according to claim 1, characterized in that the method further comprises: before the step (1), polishing the damaged part of the vehicle paint; the polishing process comprises the following steps: carrying out first grinding on the damaged part of the vehicle paint by using 800-1000-mesh sand paper, and carrying out second grinding on the damaged part of the vehicle paint by using 1500-2000-mesh sand paper; wherein the area of the second polish exceeds the area of the first polish.
6. The method according to claim 1, wherein the first top coat has a construction viscosity of 14 to 16s at 25 ℃, and the first top coat has a film thickness of 3 to 5m; the construction viscosity of the second finish paint at 25 ℃ is 14-17 s, and the film thickness of the second finish paint layer is 15-25 m; the construction viscosity of the third finishing paint at 25 ℃ is 16-18 s, and the film thickness of the third finishing paint layer is 30-45 m.
7. The method of claim 1, wherein the spraying of the first topcoat in step (1) comprises: spraying 2-3 layers of first surface paint at the temperature of 20-25 ℃ and the humidity of 50-65%, standing and drying for 5-10 min after each layer of first surface paint is sprayed, and then spraying the next layer;
the spraying method of the second finishing paint comprises the following steps: after the surface of the first finish paint layer is dried, spraying 2-3 layers of second finish paint at the temperature of 20-25 ℃ and the humidity of 50-65%, standing and flashing for 10-15 min after each layer of second finish paint is sprayed, and then spraying the next layer;
the spraying method of the third finishing paint comprises the following steps: after the surface of the second finish paint layer is dried, spraying 2-3 layers of third finish paint under the conditions that the temperature is 20-25 ℃ and the humidity is 50-65%, standing and flashing for 5-10 min after each layer of third finish paint is sprayed, and then spraying the next layer.
8. The method of claim 1, wherein the spray conditions of the port diluent in step (2) comprise: spraying after the third finishing paint is sprayed for 3-5 minutes;
the baking conditions include: and baking at a position 60-90 cm away from the repair paint surface by using an infrared baking lamp, wherein the baking temperature is 80-100 ℃, and the baking time is 15-25 min.
9. The method of claim 1, wherein the first, second and third top coats are sprayed by using a spray gun, the spray gun is a down-pressure spray gun, the diameter of a spray gun nozzle is 1.3-1.4 mm, and the air pressure of the spray gun is 0.18-0.3 mpa.
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| CN202210639653.9A CN114871075B (en) | 2022-06-07 | 2022-06-07 | Method for repairing automobile paint |
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| CN202210639653.9A CN114871075B (en) | 2022-06-07 | 2022-06-07 | Method for repairing automobile paint |
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| CN114871075B true CN114871075B (en) | 2023-06-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5871809A (en) * | 1993-11-20 | 1999-02-16 | Basf Lacke + Farben, Ag | Process for the preparation of a multicoat refinish |
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| CN108855840A (en) * | 2018-06-12 | 2018-11-23 | 广西速道汽车维修服务有限公司 | A kind of restorative procedure of Automobile paint |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5871809A (en) * | 1993-11-20 | 1999-02-16 | Basf Lacke + Farben, Ag | Process for the preparation of a multicoat refinish |
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