CN114871075A - Method for repairing automobile paint - Google Patents
Method for repairing automobile paint Download PDFInfo
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- CN114871075A CN114871075A CN202210639653.9A CN202210639653A CN114871075A CN 114871075 A CN114871075 A CN 114871075A CN 202210639653 A CN202210639653 A CN 202210639653A CN 114871075 A CN114871075 A CN 114871075A
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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
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The present disclosure relates to a method of repairing automotive vehicle paint, the method comprising (1) spraying a first topcoat on a damaged portion of the vehicle paint 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 lapel thinner at the junction of the original vehicle paint and the third paint layer, and baking and polishing after the surface of the lapel thinner is dried. The method comprises the steps of spraying a first finish paint with a specific composition before spraying a second finish paint, wherein the varnish in the first finish paint is excessive than a varnish curing agent, so that part of varnish in the first finish paint is cured firstly, and the rest uncured varnish can act with the varnish curing agent in a third finish paint to be crosslinked, so that intermolecular hydrogen bonds are increased, the adhesive force of the second finish paint is increased, and the mechanical strength of the painted surface is increased; grinding by adopting a lapel thinner to reduce the color difference of paint repair; the method is environment-friendly and economical, has simple operation steps, and has strong applicability and popularization.
Description
Technical Field
The disclosure relates to the technical field of automobile paint spraying, in particular to a method for repairing automobile paint.
Background
The automobile is a vehicle in daily life of people, along with the continuous improvement of the living standard of people, the possession of private automobiles is also increased rapidly year by year, the number of the automobiles on the lanes in the urban avenue is increased, the driving safety problem is increased, small-touch small-wipe is even more numerous, the small-touch small-wipe can cause the damage of the paint surface of the automobile, and the attractiveness is influenced.
Whether in a host factory or a 4S shop, the problem of color difference exists in the repair of the automobile paint, and particularly the spraying effect of the metal paint is different under the same environment and different process methods; the sprayed effects of the same process and different environment operations are different, and the phenomenon of unqualified adhesive force is easy to occur in metallic paint repair, which can cause poor repair and secondary repair, and seriously affect the use of vehicles.
Disclosure of Invention
The method is environment-friendly and economical, has simple operation steps, can increase the mechanical strength and the adhesive force of the paint surface, and solves the problems of large color difference and poor adhesive force of metallic paint repair.
The present disclosure provides a method of repairing an 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 refuge thinner at the junction of the original vehicle paint and the third paint layer, and baking and polishing after the surface of the refuge thinner is dried;
the first surface paint and the third surface paint respectively comprise varnish and a varnish curing agent, and the overlap thinner comprises acrylic polyurethane;
the mass ratio of varnish to a varnish curing agent in the first finish paint is (8-14): 1.
optionally, the varnish is an acrylate varnish, preferably a hydroxy acrylic resin varnish, and the varnish curing agent comprises isocyanate, xylene, n-butyl acetate, and 1-methoxy-2-propyl acetate;
based on the total weight of the varnish curing agent, the content of the isocyanate is 80-85 wt%, the content of the xylene is 1-2 wt%, the content of the n-butyl acetate is 5-10 wt%, and the content of the 1-methoxy-2-propyl acetate is 2-3 wt%.
Optionally, the mass ratio of isocyanate to n-butyl acetate in the varnish curing agent is (8-16): 1, the mass ratio of the isocyanate to the 1-methoxy-2-propyl acetate is (33-50): 1.
optionally, the mass ratio of the varnish to the varnish curing agent in the first finish paint is (9-11): 1; the third finish paint comprises the following components in percentage by mass (1-3): 1.
optionally, the second topcoat is selected from a solvent-based basecoat comprising a metal basecoat or a pearl basecoat, the metal basecoat comprising a hydroxyacrylic resin, a pigment, silver paste powder, and an organic diluent.
Optionally, the method further comprises: before the step (1), polishing the damaged part of the vehicle paint; optionally, the grinding process comprises: performing first polishing on the damaged part of the vehicle paint by using 800-1000 meshes of abrasive paper, and performing second polishing on the damaged part of the vehicle paint by using 1500-2000 meshes of abrasive paper; wherein the second sanding area range exceeds the first sanding area range.
Optionally, the construction viscosity of the first finish paint at 25 ℃ is 14-16 s, and the film thickness of the first finish paint layer is 3-5 μm; the construction viscosity of the second finish at 25 ℃ is 14-17 s, and the film thickness of the second finish layer is 15-25 mu m; the third finish paint has the construction viscosity of 16-18 s at 25 ℃, and the film thickness of the third finish paint layer is 30-45 microns.
Optionally, the spraying method of the first finish paint in the step (1) comprises the following steps: spraying 2-3 layers of first finish paint at the temperature of 20-25 ℃ and the humidity of 50-65%, standing and flashing each layer for 5-10 min after spraying, and then spraying the next layer;
the spraying method of the second finish paint comprises the following steps: after the surface of the first surface paint layer is dried, spraying 2-3 layers of second surface paint under the conditions that the temperature is 20-25 ℃ and the humidity is 50-65%, standing and flashing each layer for 10-15 min after spraying, and then spraying the next layer;
the spraying method of the third finish paint comprises the following steps: and after the surface of the second surface paint layer is dried, spraying 2-3 layers of third surface paint under the conditions that the temperature is 20-25 ℃ and the humidity is 50-65%, standing and flashing each layer for 5-10 min after spraying, and then spraying the next layer.
Optionally, the spraying conditions of the lapel diluent in the step (2) include: spraying the third finish paint after the third finish paint is sprayed for 3-5 minutes;
the baking conditions include: and (3) baking at a position 60-90 cm away from the repaired 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 a spray gun, the spray gun is a downward-pressing spray gun, the diameter of a nozzle of the spray gun is 1.3-1.4 mm, and the air pressure of the spray gun is 0.18-0.3 Mpa.
According to the technical scheme, the method comprises the steps of spraying a first finish paint with a specific composition before spraying a second finish paint, and then spraying a second finish paint and a third finish paint, wherein the amount of the varnish in the first finish paint is more than that of a varnish curing agent, so that part of the varnish in the first finish paint is cured firstly, and the rest uncured varnish acts with the varnish curing agent in the third finish paint to be crosslinked, so that intermolecular hydrogen bonds are increased, the adhesive force of the second finish paint is increased, and the mechanical strength of the painted surface is increased; grinding by adopting a lapel thinner, so that the color difference of paint repair is reduced; the method is environment-friendly and economical, has simple operation steps, and has strong applicability and popularization.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a photograph of the effects of the paint film cross-hatch test of example 2;
FIG. 2 is a photograph of the effects of the paint film cross-hatch test of example 3;
FIG. 3 is a picture of the effects of the paint film cross-hatch test of comparative example 1;
FIG. 4 is a picture of the effects of the paint film cross-hatch test of comparative example 2;
fig. 5 is a picture of the effects of the paint film cross-hatch test of comparative example 3.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
The present disclosure provides a method of repairing an 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 refuge thinner at the junction of the original vehicle paint and the third paint layer, and baking and polishing after the surface of the refuge thinner is dried;
the first surface paint and the third surface paint respectively comprise varnish and a varnish curing agent, and the roll line thinner comprises acrylic polyurethane;
the mass ratio of the varnish to the varnish curing agent in the first finish paint is (8-14): 1.
in the technical scheme, the method comprises the steps of spraying a first finishing coat with a specific composition before spraying a second finishing coat, and then spraying a second finishing coat and a third finishing coat, wherein the varnish in the first finishing coat is excessive in a varnish curing agent, so that part of the varnish in the first finishing coat is cured firstly, and the rest uncured varnish can act with the varnish curing agent in the third finishing coat to be crosslinked, so that hydrogen bonds among molecules are increased, and the adhesive force of the second finishing coat is increased; the edge part of the paint repair is sprayed by adopting the lapel thinner, so that the color difference of the paint repair can be reduced; the preparation method is environment-friendly and economical, has simple operation steps, and has strong applicability and popularization.
In one embodiment of the present disclosure, the varnish is an acrylate varnish, preferably a hydroxy acrylic resin varnish, and the varnish curing agent comprises isocyanate, xylene, n-butyl acetate, and 1-methoxy-2-propyl acetate; based on the total weight of the varnish curing agent, the content of the isocyanate is 80-85 wt%, the content of the xylene is 1-2 wt%, the content of the n-butyl acetate is 5-10 wt%, and the content of the 1-methoxy-2-propyl acetate is 2-3 wt%. In the embodiment, the varnish and the varnish curing agent with preferable components are selected, so that the first varnish has good dispersibility, paint film fusion during large-area construction is facilitated, and the connecting 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 (8-16): 1, the mass ratio of the isocyanate to the 1-methoxy-2-propyl acetate is (33-50): 1. in the embodiment, the cleaning curing agent with the optimal proportion is selected, so that the varnish curing can be accelerated, and the next reaction can be favorably carried out.
In one embodiment of the disclosure, the mass ratio of the varnish to the varnish curing agent in the first finish paint is (9-11): 1; the third finish paint comprises the following components in percentage by mass (1-3): 1. in the above embodiment, the first topcoat and the third topcoat are selected in a preferred ratio, so that the excessive uncured varnish in the first topcoat and the varnish curing agent in the third topcoat act to crosslink, thereby increasing the adhesion of the second topcoat.
In one embodiment of the present disclosure, the second topcoat is selected from a solvent-based basecoat comprising a metal basecoat or a pearl basecoat comprising a hydroxyacrylic resin, a pigment, a silver paste powder, and an organic diluent.
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 grinding process comprises: performing first polishing on the damaged part of the vehicle paint by using 800-1000 meshes of abrasive paper, and performing second polishing on the damaged part of the vehicle paint by using 1500-2000 meshes of abrasive paper; wherein the second sanding area range exceeds the first sanding area range, i.e. the second sanding comprises sanding the edge of the vehicle paint damage location. In the embodiment, the automobile paint damage position and the damage edge are polished, so that the transition of the connection port is smooth, the subsequent polishing treatment is facilitated, the consistency of the colors of new paint and old paint is kept, and the color difference of paint repair is reduced.
In one embodiment of the disclosure, the first finish paint has an application viscosity of 14-16 s at 25 ℃, and the film thickness of the first finish paint layer is 3-5 μm; the construction viscosity of the second finish at 25 ℃ is 14-17 s, and the film thickness of the second finish layer is 15-25 mu m; the third finish paint has the construction viscosity of 16-18 s at 25 ℃, and the film thickness of the third finish paint layer is 30-45 microns. In the embodiment, the first finish paint, the second finish paint and the third finish paint with the optimized viscosity are selected, so that the first finish paint, the second finish paint and the third finish paint are favorably diffused after being sprayed, the thickness of a cured finish paint layer is thinner, and the color difference between a repair paint and an original paint is conveniently controlled; the first surface paint layer, the second surface paint layer and the third surface paint layer with the optimal film thickness are selected, so that the cross-linking between surface paint molecules is facilitated, the paint surface is dried quickly, and the mechanical strength, the adhesive force and the gloss plumpness of the paint surface are increased.
In one embodiment of the present disclosure, the spraying method of the first finish paint in step (1) comprises: spraying 2-3 layers of first finish paint under the conditions that the temperature is 20-25 ℃ and the humidity is 50-65%, standing and flashing off each layer for 5-10 min after spraying, and then spraying the next layer; the spraying method of the second finish paint comprises the following steps: after the surface of the first surface paint layer is dried, spraying 2-3 layers of second surface paint under the conditions that the temperature is 20-25 ℃ and the humidity is 50-65%, standing and flashing each layer for 10-15 min after spraying, and then spraying the next layer; the spraying method of the third finish paint comprises the following steps: and after the surface of the second finish coat is dried, spraying 2-3 layers of third finish coats at the temperature of 20-25 ℃ and the humidity of 50-65%, standing and flashing each layer for 5-10 min after spraying, and then spraying the next layer. In the above embodiment, by adopting the preferable spraying method, the sprayed finish paint is advantageous to flash dry quickly, and the adhesion of the paint surface is increased.
In one embodiment of the present disclosure, the spraying conditions of the lapel diluent in step (2) include: spraying the third finish paint after the third finish paint is sprayed for 3-5 minutes; the baking conditions include: and (3) baking at a position 60-90 cm away from the repaired 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 above embodiment, by selecting the preferable baking condition, the internal molecular diffusion motion of the overlap thinner is facilitated, so that local molecules are not easy to deform, and the hardness and toughness of the finish paint are improved.
In an embodiment of the disclosure, the first finish paint, the second finish paint and the third finish paint are sprayed by a spray gun, the spray gun is a downward-pressing spray gun, the diameter of a nozzle of the spray gun is 1.3-1.4 mm, and the air pressure of the spray gun is 0.18-0.3 Mpa. In the above embodiment, the spray gun is preferably selected for spraying, so that the spraying is uniform and smooth, no particle feeling is generated, and the paint color and luster are good.
The method for repairing the automobile paint provided by the disclosure comprises the steps of spraying a first finish paint with a specific composition before spraying a second finish paint, and then spraying a second finish paint and a third finish paint, wherein the amount of varnish in the first finish paint is more than that of a varnish curing agent, so that part of varnish in the first finish paint is cured firstly, and the rest of uncured varnish can be acted with the varnish curing agent in the third finish paint to be crosslinked, so that intermolecular hydrogen bonds are increased, the adhesive force of the second finish paint is increased, and the mechanical strength of a paint surface is increased; grinding by adopting a lapel thinner to reduce the color difference of paint repair; 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 limited thereto in any way.
In the following examples and comparative examples, the starting materials used were all commercial products unless otherwise specified.
The varnish is CX926 acrylic polyurethane varnish produced by Hebei Kefeng water-based paint company Limited;
the varnish curing agent is CX825H acrylic polyurethane finish curing agent produced by Hebei Kefeng water-based paint company Limited;
the solvent-based metal base paint is CX825T acrylic polyurethane finish diluent produced by Hebei Kefeng water-based paint company Limited;
the material is CX825T acrylic polyurethane finish paint thinner produced by Hebei Kefeng water paint Co.
Hardness test standard: GB 6739-86 Pencil determination method for hardness of coating;
adhesion test standard: GB/T9286-1998 test of the ruling of paint films for paints and varnishes;
and (3) finishing paint construction viscosity test standard: GB/T1723-93;
paint film thickness test standard: GB/T1764-79.
Example 1
In this embodiment, a commercial passenger car is used for repairing the car paint, and the specific steps are as follows:
1. shielding the parts which do not need to be sprayed by a protective film, shielding paper or adhesive tape;
2. the method comprises the steps of polishing old paint (light scratch or color difference, and heavy damage such as pits and the like, and atomic ash repair and spraying treatment are needed) of a damaged part of a commercial passenger car by using 800-mesh abrasive paper, and polishing the edges of the old paint and the old paint of the damaged part by using 1500-mesh abrasive paper, wherein the polishing area range of the 800-mesh abrasive paper exceeds the spraying range of metal base paint, but cannot exceed the polishing range of the 1500-mesh abrasive paper;
3. spraying 2-3 layers of first finish 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 finish 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 surface paint layer is dried, spraying 2-3 layers of solvent type metal base paint under the conditions that the temperature is 25 ℃ and the humidity is 65%, and spraying the next layer after each layer is sprayed, standing and flashing for 10-15 min; wherein the construction viscosity of the second finish paint is 14s, the film thickness of the formed second finish paint layer is 20 mu m, and the solvent type metal base paint is prepared from materials such as hydroxyl acrylic resin, imported pigment, imported silver paste, organic diluent and the like.
5. After the surface of the second finish coat is dried, spraying 2-3 layers of third finish coats 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 finish coats 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 thickness of the formed third finish paint layer is 30 mu m;
6. spraying acrylic polyurethane overlap thinner after the third finish paint is sprayed for 5 minutes, baking the repaired paint surface at 80cm by using an infrared baking lamp after the surface is dried for 5 minutes, wherein the baking temperature is 80 ℃, the baking time is 25 minutes, and polishing is carried out for 24 hours after baking;
wherein the varnish comprises hydroxy acrylic resin varnish, and the varnish curing agent comprises isocyanate, dimethylbenzene, 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 xylene is 1-2 wt%, the content of n-butyl acetate is 5-10 wt%, and the content of 1-methoxy-2-propyl acetate 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 1-methoxy-2-propyl acetate is (33-50): 1; spraying the first finish paint, the second finish paint and the third finish paint by using a spray gun, wherein the spray gun is a downward-pressing spray gun, the diameter of a nozzle of the spray gun is 1.3-1.4 mm, and the air pressure of the spray gun is 0.2 Mpa;
and (3) testing the performance of the paint film: the hardness is more than or equal to H, the adhesive force is 0 grade, the cutting edge is completely smooth, and no square grid delamination exists.
Example 2
The same procedure as in example 1, except that: in the first finish paint, the mass ratio of varnish to varnish curing agent is 8: 1; and (3) testing the performance of the paint film: the hardness is more than or equal to H, the adhesive force is grade 1, a little coating falls off at the intersection of the cuts, but the influence on the cross cutting area is not more than 5 percent, and the effect is shown in figure 1.
Example 3
The same procedure as in example 1, except that: the mass ratio of the varnish to the varnish curing agent in the third finish paint is 3: 1; and (3) testing the performance of the paint film: the hardness is more than or equal to H, the adhesive force is grade 1, a little coating falls off at the intersection of the cuts, but the influence on the cross cutting area is not more than 5 percent, and the effect is shown in figure 2.
Comparative example 1
The same procedure as in example 1, except that: in the first finish paint, the mass ratio of varnish to varnish curing agent is 7: 1; and (3) testing the performance of the paint film: the hardness is more than or equal to HB, the adhesive force is grade 2, the affected cross cutting area of the coating is 5-15%, and the effect is shown in figure 3.
Comparative example 2
The same procedure as in example 1, except that: the mass ratio of the varnish to the varnish curing agent in the first finish paint is 15: 1; and (3) testing the performance of the paint film: the hardness is more than or equal to H, the adhesive force is 2 grade, the affected cross cutting area of the coating is 5-15%, and the effect is shown in figure 4.
Comparative example 3
The same procedure as in example 1, except that: directly spraying a metal base paint without spraying a first finish paint after polishing; and (3) testing the performance of the paint film: the hardness is more than or equal to H, the adhesive force is 2 grade, the affected cross cutting area of the coating is 5-15%, and the effect is shown in figure 5.
Test example:
the refinishing paints prepared in the examples and comparative examples were subjected to a paint film cutting test according to GB/T9286-1998 cutting test for paint and varnish paint films, analysis of the results: the cutting edge of example 1 was completely smooth without any square delamination, and the intersection of the cuts of examples 2-3 had a little coating peeling off, but the cross-cut area was affected by no more than 5%, while the coatings of comparative examples 1-3 had an affected cross-cut area of 5-15%.
By the method, the surface of the repaired vehicle paint is smooth, the color difference of vehicle body repair can be effectively reduced, the repair efficiency can be improved, the overall repaired metallic paint looks more stereoscopic, metallic and glittering, and the method has high applicability and popularization.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure. It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A method of repairing automotive vehicle 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 refuge thinner at the junction of the original vehicle paint and the third paint layer, and baking and polishing after the surface of the refuge thinner is dried;
the first surface paint and the third surface paint respectively comprise varnish and a varnish curing agent, and the overlap thinner comprises acrylic polyurethane;
the mass ratio of the varnish to the varnish curing agent in the first finish paint is (8-14): 1.
2. the method according to claim 1, wherein the varnish is an acrylate varnish, preferably a hydroxy acrylic resin varnish, and the varnish curing agent comprises isocyanate, xylene, n-butyl acetate and 1-methoxy-2-propyl acetate;
based on the total weight of the varnish curing agent, the content of the isocyanate is 80-85 wt%, the content of the xylene is 1-2 wt%, the content of the n-butyl acetate is 5-10 wt%, and the content of the 1-methoxy-2-propyl acetate is 2-3 wt%.
3. The method according to claim 2, wherein the mass ratio of the isocyanate to the n-butyl acetate in the varnish curing agent is (8-16): 1, the mass ratio of the isocyanate to the 1-methoxy-2-propyl acetate is (33-50): 1.
4. the method according to claim 1, wherein the mass ratio of the varnish to the varnish curing agent in the first finish paint is (9-11): 1; the third finish paint comprises the following components in percentage by mass (1-3): 1.
5. the method of claim 1, wherein the second topcoat is selected from the group consisting of solvent-based primers including metallic primers or pearl primers, the metallic primers including hydroxy acrylic, pigments, silver paste powder, and organic diluents.
6. The method of claim 1, further comprising: before the step (1), polishing the damaged part of the vehicle paint; optionally, the grinding process comprises: performing first polishing on the damaged part of the vehicle paint by using 800-1000 meshes of abrasive paper, and performing second polishing on the damaged part of the vehicle paint by using 1500-2000 meshes of abrasive paper; wherein the second sanding area range exceeds the first sanding area range.
7. The method according to claim 1, wherein the first topcoat has an application viscosity of 14 to 16s at 25 ℃, and the film thickness of the first topcoat layer is 3 to 5 μm; the construction viscosity of the second finish at 25 ℃ is 14-17 s, and the film thickness of the second finish layer is 15-25 mu m; the third finish paint has the construction viscosity of 16-18 s at 25 ℃, and the film thickness of the third finish paint layer is 30-45 microns.
8. The method of claim 1, wherein the spraying of the first topcoat in step (1) comprises: spraying 2-3 layers of first finish paint under the conditions that the temperature is 20-25 ℃ and the humidity is 50-65%, standing and flashing off each layer for 5-10 min after spraying, and then spraying the next layer;
the spraying method of the second finish paint comprises the following steps: after the surface of the first surface paint layer is dried, spraying 2-3 layers of second surface paint under the conditions that the temperature is 20-25 ℃ and the humidity is 50-65%, standing and flashing each layer for 10-15 min after spraying, and then spraying the next layer;
the spraying method of the third finish paint comprises the following steps: and after the surface of the second finish coat is dried, spraying 2-3 layers of third finish coats at the temperature of 20-25 ℃ and the humidity of 50-65%, standing and flashing each layer for 5-10 min after spraying, and then spraying the next layer.
9. The method according to claim 1, wherein the conditions for spraying the rag stock in step (2) comprise: spraying the third finish paint after the third finish paint is sprayed for 3-5 minutes;
the baking conditions include: and (3) baking at a position 60-90 cm away from the repaired paint surface by using an infrared baking lamp, wherein the baking temperature is 80-100 ℃, and the baking time is 15-25 min.
10. The method according to claim 1, wherein the first finish paint, the second finish paint and the third finish paint are sprayed by a spray gun, the spray gun is a down-pressure spray gun, the diameter of a nozzle of the spray gun 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116371704A (en) * | 2023-03-21 | 2023-07-04 | 上海申龙客车有限公司 | Varnish coating and preparation method thereof |
Citations (2)
| 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 |
| 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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- 2022-06-07 CN CN202210639653.9A patent/CN114871075B/en active Active
Patent Citations (2)
| 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 |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116371704A (en) * | 2023-03-21 | 2023-07-04 | 上海申龙客车有限公司 | Varnish coating and preparation method thereof |
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| CN114871075B (en) | 2023-06-30 |
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