CN111036513A - Method for improving foaming defect of varnish after spraying water-based metal paint - Google Patents
Method for improving foaming defect of varnish after spraying water-based metal paint Download PDFInfo
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- CN111036513A CN111036513A CN201911303977.XA CN201911303977A CN111036513A CN 111036513 A CN111036513 A CN 111036513A CN 201911303977 A CN201911303977 A CN 201911303977A CN 111036513 A CN111036513 A CN 111036513A
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- water
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- varnish
- paint
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Classifications
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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
- B05D3/002—Pretreatement
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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
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
-
- 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
- B05D3/0272—After-treatment with ovens
-
- 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
- B05D7/16—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 using synthetic lacquers or varnishes
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a method for improving the foaming defect of varnish after spraying water-based metal paint, which comprises the following steps of S1: before coating, wiping and cleaning the surface of a workpiece by using clean water and a solvent, removing organic solvent, oil, acid, alkali, salt, mechanical impurities and the like on the surface of the workpiece, and if the surface of the workpiece is rusted, polishing by using abrasive paper to remove rust or pickling; s2, diluting the water-based metallic paint: pouring the water-based metal paint into a stirring drum, and then adding a proper amount of clear water for dilution, wherein the weight ratio of the clear water to the water-based metal paint is 0.4-0.6: and 1, adding water for dilution, fully stirring, standing for 10 minutes after stirring is finished, and testing viscosity. According to the invention, the total film thickness of the spraying is controlled to be 90 +/-10 mu m, the actual measurement temperature of the flash drying furnace is increased to 75 ℃, the baking temperature is prolonged to 15 minutes, the varnish on the surface of the workpiece does not generate bubbles, and the qualification rate is increased.
Description
Technical Field
The invention relates to the technical field of automobile paint spraying, in particular to a method for improving foaming defects of varnish after spraying water-based metal paint.
Background
The vehicle is a vehicle that has its own power to drive and can be driven by motor without the need of rail or electric power installation. The automobile body mainly adopts a metal shell, varnish is required to be sprayed in the metal shell to protect the metal body, automobile painting means that a layer of paint is coated on the surface of an automobile to achieve the effect of protecting the automobile, the paint adopted by general automobile painting is water-based paint, in an automobile manufacturing factory, the welding of a frame and an automobile shell is completed, and the next procedure is painting.
After the water-based metallic paint is sprayed on an automobile shell, the automobile shell needs to be put into a flash drying furnace for baking, water boils in the process of curing and film forming due to insufficient dehydration in the baking process, bubbles are generated on the surface of varnish, the paint surface defect is caused, and the spraying effect is unqualified.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a method for improving the foaming defect of a varnish sprayed on a water-based metallic paint, which is characterized in that the total film thickness of the sprayed film is controlled to be 90 +/-10 mu m in the spraying process of the water-based metallic paint, the actual measurement temperature of a flash drying furnace is increased in the baking process, the actual measurement temperature is increased to 75 ℃, the baking temperature is prolonged to 15 minutes, and the water-based metallic paint can be fully dehydrated after being sprayed, so that the varnish on the surface of a workpiece cannot generate bubbles, the qualification rate is increased to 93.33%, the varnish on the surface of the workpiece has good smoothness and color and luster.
In order to achieve the purpose, the invention provides the following technical scheme: a method for improving foaming defects of varnish after spraying of water-based metallic paint comprises the following steps:
s1, workpiece cleaning: before coating, wiping and cleaning the surface of a workpiece by using clean water and a solvent, removing organic solvent, oil, acid, alkali, salt, mechanical impurities and the like on the surface of the workpiece, and if the surface of the workpiece is rusted, polishing by using abrasive paper to remove rust or pickling;
s2, diluting the water-based metallic paint: pouring the water-based metal paint into a stirring drum, and then adding a proper amount of clear water for dilution, wherein the weight ratio of the clear water to the water-based metal paint is 0.4-0.6: 1, adding water for dilution, fully stirring, standing for 10 minutes after stirring is finished, and then testing viscosity;
s3, spraying: the prepared water-based metallic paint is put into spraying equipment, the air pressure value of the spraying equipment is adjusted to be within the range of 0.3MPa-0.4MPa, the distance between a nozzle of the spraying equipment and an object plane is preferably 320 mm-380 mm, a spray gun uniformly operates at the speed of 10-12 m/min in the spraying process, and the total film thickness of manual spraying is controlled to be 90 +/-10 um.
S4, drying: and standing and leveling for 7-8 minutes after the spraying is finished, and then placing the mixture into a flash drying furnace for baking, wherein the actually measured baking temperature in the flash drying furnace is 70-75 ℃, and the baking time is 13-15 minutes.
Preferably, the viscosity of the aqueous metallic paint in the step S2 is 20 seconds to 27 seconds.
Preferably, the water-based metallic paint is filtered by a 200-300 mesh filter screen before being filled into the spraying equipment.
Preferably, the spray nozzle is arranged to spray the coating material in a plane perpendicular to the object plane.
The invention has the technical effects and advantages that:
according to the invention, in the spraying process of the water-based metallic paint, the total film thickness of the sprayed film is controlled to be 90 +/-10 mu m, in the baking process, the actual measurement temperature of the flash drying furnace is increased to 75 ℃, and the baking temperature is prolonged to 15 minutes.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
S1, workpiece cleaning: before coating, wiping and cleaning the surface of a workpiece by using clean water and a solvent, removing organic solvent, oil, acid, alkali, salt, mechanical impurities and the like on the surface of the workpiece, and if the surface of the workpiece is rusted, polishing by using abrasive paper to remove rust or pickling;
s2, diluting the water-based metallic paint: pouring the water-based metal paint into a stirring drum, and then adding a proper amount of clear water for dilution, wherein the weight ratio of the clear water to the water-based metal paint is 0.4: 1, adding water for dilution, fully stirring, standing for 10 minutes after stirring is finished, testing the viscosity, and adjusting the viscosity of the water-based metal paint to be 20 seconds;
s3, spraying: the prepared water-based metallic paint is put into spraying equipment, the air pressure value of the spraying equipment is adjusted to be within the range of 0.3MPa-0.4MPa, the interval between a nozzle of the spraying equipment and an object surface is preferably 320 mm-380 mm, a spray gun uniformly operates at the speed of 10-12 m/min in the spraying process, the nozzle is straight and straight to spray on the object surface, the total film thickness of manual spraying is controlled to be 90 +/-10 mu m, and the water-based metallic paint is filtered by a 200-plus-300-mesh filter screen before being put into the spraying equipment.
S4, drying: and standing and leveling for 7-8 minutes after the spraying is finished, and then placing the mixture into a flash drying furnace for baking, wherein the actually measured baking temperature in the flash drying furnace is 70 ℃, and the baking time is 13 minutes.
Example 2
S1, workpiece cleaning: before coating, wiping and cleaning the surface of a workpiece by using clean water and a solvent, removing organic solvent, oil, acid, alkali, salt, mechanical impurities and the like on the surface of the workpiece, and if the surface of the workpiece is rusted, polishing by using abrasive paper to remove rust or pickling;
s2, diluting the water-based metallic paint: pouring the water-based metal paint into a stirring drum, and then adding a proper amount of clear water for dilution, wherein the weight ratio of the clear water to the water-based metal paint is 0.6: 1, adding water for dilution, fully stirring, standing for 10 minutes after stirring is finished, testing the viscosity, and adjusting the viscosity of the water-based metal paint to 25 seconds;
s3, spraying: the prepared water-based metallic paint is put into spraying equipment, the air pressure value of the spraying equipment is adjusted to be within the range of 0.3MPa-0.4MPa, the interval between a nozzle of the spraying equipment and an object surface is preferably 320 mm-380 mm, a spray gun uniformly operates at the speed of 10-12 m/min in the spraying process, the nozzle is straight and straight to spray on the object surface, the total film thickness of manual spraying is controlled to be 90 +/-10 mu m, and the water-based metallic paint is filtered by a 200-plus-300-mesh filter screen before being put into the spraying equipment.
S4, drying: and standing and leveling for 7-8 minutes after the spraying is finished, and then placing the mixture into a flash drying furnace for baking, wherein the actually measured baking temperature in the flash drying furnace is 72 ℃, and the baking time is 14 minutes.
Example 3
S1, workpiece cleaning: before coating, wiping and cleaning the surface of a workpiece by using clean water and a solvent, removing organic solvent, oil, acid, alkali, salt, mechanical impurities and the like on the surface of the workpiece, and if the surface of the workpiece is rusted, polishing by using abrasive paper to remove rust or pickling;
s2, diluting the water-based metallic paint: pouring the water-based metal paint into a stirring drum, and then adding a proper amount of clear water for dilution, wherein the weight ratio of the clear water to the water-based metal paint is 0.5: 1, adding water for dilution, fully stirring, standing for 10 minutes after stirring is finished, testing the viscosity, and adjusting the viscosity of the water-based metal paint to be 27 seconds;
s3, spraying: the prepared water-based metallic paint is put into spraying equipment, the air pressure value of the spraying equipment is adjusted to be within the range of 0.3MPa-0.4MPa, the interval between a nozzle of the spraying equipment and an object surface is preferably 320 mm-380 mm, a spray gun uniformly operates at the speed of 10-12 m/min in the spraying process, the nozzle is straight and straight to spray on the object surface, the total film thickness of manual spraying is controlled to be 90 +/-10 mu m, and the water-based metallic paint is filtered by a 200-plus-300-mesh filter screen before being put into the spraying equipment.
S4, drying: and standing and leveling for 7-8 minutes after spraying is finished, and then placing the mixture into a flash drying furnace for baking, wherein the actually measured baking temperature in the flash drying furnace is 75 ℃, and the baking time is 15 minutes.
Comparative example
S1, workpiece cleaning: before coating, wiping and cleaning the surface of a workpiece by using clean water and a solvent, removing organic solvent, oil, acid, alkali, salt, mechanical impurities and the like on the surface of the workpiece, and if the surface of the workpiece is rusted, polishing by using abrasive paper to remove rust or pickling;
s2, diluting the water-based metallic paint: pouring the water-based metal paint into a stirring drum, and then adding a proper amount of clear water for dilution, wherein the weight ratio of the clear water to the water-based metal paint is 0.4-0.6: 1, adding water for dilution, fully stirring, standing for 10 minutes after stirring is finished, testing the viscosity, and adjusting the viscosity of the water-based metal paint to be 27 seconds;
s3, spraying: the prepared water-based metallic paint is put into spraying equipment, the air pressure value of the spraying equipment is adjusted to be within the range of 0.3MPa-0.4MPa, the interval between a nozzle of the spraying equipment and an object surface is preferably 320 mm-380 mm, a spray gun uniformly operates at the speed of 10-12 m/min in the spraying process, the nozzle is straight and straight to spray on the object surface, the total film thickness of manual spraying is controlled to be 90 +/-10 mu m, and the water-based metallic paint is filtered by a 200-plus-300-mesh filter screen before being put into the spraying equipment.
S4, drying: and standing and leveling for 7-8 minutes after spraying is finished, and then placing the mixture into a flash drying furnace for baking, wherein the actually measured baking temperature in the flash drying furnace is 48 ℃, and the baking time is 10 minutes.
The painted surfaces of examples 1-3 and comparative example were tested for appearance, thickness, hardness, adhesion, abrasion resistance, chemical resistance, and corrosion resistance,
through detection, in examples 1-3, the dried paint film has flat appearance, no bubbles and good color and luster degree, and the film hardness meets the regulation of GB 6739-86 pencil determination method for film hardness; the adhesive force is in accordance with the result grading method of GB 9286-88 grid drawing method test of paint film of color paint and varnish by grid drawing method of the national standard; the wear resistance of the coating film meets the requirements of the national standard GB 1768-79-88 paint film wear resistance test method; the chemical resistance of the coating film meets the requirements of national standard GB 1763-79 method for testing chemical resistance of paint film 88.
According to the invention, in the spraying process of the water-based metallic paint, the total film thickness of the sprayed film is controlled to be 90 +/-10 mu m, in the baking process, the actual measurement temperature of the flash drying furnace is increased to 75 ℃, and the baking temperature is prolonged to 15 minutes.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (4)
1. A method for improving the foaming defect of varnish after spraying water-based metallic paint is characterized in that: the method comprises the following steps:
s1, workpiece cleaning: before coating, wiping and cleaning the surface of a workpiece by using clean water and a solvent, removing organic solvent, oil, acid, alkali, salt, mechanical impurities and the like on the surface of the workpiece, and if the surface of the workpiece is rusted, polishing by using abrasive paper to remove rust or pickling;
s2, diluting the water-based metallic paint: pouring the water-based metal paint into a stirring drum, and then adding a proper amount of clear water for dilution, wherein the weight ratio of the clear water to the water-based metal paint is 0.4-0.6: 1, adding water for dilution, fully stirring, standing for 10 minutes after stirring is finished, and then testing viscosity;
s3, spraying: the prepared water-based metallic paint is put into spraying equipment, the air pressure value of the spraying equipment is adjusted to be within the range of 0.3MPa-0.4MPa, the distance between a nozzle of the spraying equipment and an object plane is preferably 320 mm-380 mm, a spray gun uniformly operates at the speed of 10-12 m/min in the spraying process, and the total film thickness of manual spraying is controlled to be 90 +/-10 um.
S4, drying: and standing and leveling for 7-8 minutes after the spraying is finished, and then placing the mixture into a flash drying furnace for baking, wherein the actually measured baking temperature in the flash drying furnace is 70-75 ℃, and the baking time is 13-15 minutes.
2. The method for improving the foaming defect of the varnish after spraying the water-based metallic paint according to claim 1, wherein: the viscosity of the water-based metallic paint in the step S2 is 20 seconds to 27 seconds.
3. The method for improving the foaming defect of the varnish after spraying the water-based metallic paint according to claim 1, wherein: before the water-based metallic paint is filled into spraying equipment, a filter screen with 200-mesh and 300-mesh is used for filtering.
4. The method for improving the foaming defect of the varnish after spraying the water-based metallic paint according to claim 1, wherein: in the spraying process, the nozzle is used for spraying in a way of being flat and straight to the object surface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911303977.XA CN111036513A (en) | 2019-12-17 | 2019-12-17 | Method for improving foaming defect of varnish after spraying water-based metal paint |
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| CN201911303977.XA CN111036513A (en) | 2019-12-17 | 2019-12-17 | Method for improving foaming defect of varnish after spraying water-based metal paint |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112588474A (en) * | 2020-12-04 | 2021-04-02 | 恒大新能源汽车投资控股集团有限公司 | Spraying method for improving appearance of automobile body paint surface |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1483641A (en) * | 2003-06-13 | 2004-03-24 | 东莞振华特种包装有限公司 | Application of water metal-paint on special package steel tank |
| CN101525759A (en) * | 2009-04-22 | 2009-09-09 | 江阴金杰利电器配件制造有限公司 | Method for plating metal pieces |
| CN105860722A (en) * | 2016-04-21 | 2016-08-17 | 廊坊立邦涂料有限公司 | Single-component, high-solid-content and low-volatility organic compound and environment-friendly type varnish composition and preparation method and application of varnish composition |
| CN107502105A (en) * | 2017-09-29 | 2017-12-22 | 重庆立晖涂料有限公司 | A kind of bloom varnish and preparation method thereof and application method |
| CN108329825A (en) * | 2017-12-28 | 2018-07-27 | 滁州金桥德克新材料有限公司 | A kind of aqueous dumb light UV solidification aluminium paint, preparation method and its application method |
| CN108329824A (en) * | 2017-12-28 | 2018-07-27 | 滁州金桥德克新材料有限公司 | A kind of aqueous light UV solidification aluminium paint, preparation method and its application method |
-
2019
- 2019-12-17 CN CN201911303977.XA patent/CN111036513A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1483641A (en) * | 2003-06-13 | 2004-03-24 | 东莞振华特种包装有限公司 | Application of water metal-paint on special package steel tank |
| CN101525759A (en) * | 2009-04-22 | 2009-09-09 | 江阴金杰利电器配件制造有限公司 | Method for plating metal pieces |
| CN105860722A (en) * | 2016-04-21 | 2016-08-17 | 廊坊立邦涂料有限公司 | Single-component, high-solid-content and low-volatility organic compound and environment-friendly type varnish composition and preparation method and application of varnish composition |
| CN107502105A (en) * | 2017-09-29 | 2017-12-22 | 重庆立晖涂料有限公司 | A kind of bloom varnish and preparation method thereof and application method |
| CN108329825A (en) * | 2017-12-28 | 2018-07-27 | 滁州金桥德克新材料有限公司 | A kind of aqueous dumb light UV solidification aluminium paint, preparation method and its application method |
| CN108329824A (en) * | 2017-12-28 | 2018-07-27 | 滁州金桥德克新材料有限公司 | A kind of aqueous light UV solidification aluminium paint, preparation method and its application method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112588474A (en) * | 2020-12-04 | 2021-04-02 | 恒大新能源汽车投资控股集团有限公司 | Spraying method for improving appearance of automobile body paint surface |
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Application publication date: 20200421 |