CN111876814A - Automobile body electrophoretic coating method - Google Patents
Automobile body electrophoretic coating method Download PDFInfo
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- CN111876814A CN111876814A CN202010770373.2A CN202010770373A CN111876814A CN 111876814 A CN111876814 A CN 111876814A CN 202010770373 A CN202010770373 A CN 202010770373A CN 111876814 A CN111876814 A CN 111876814A
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- automobile body
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- coating
- phosphating
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/12—Electrophoretic coating characterised by the process characterised by the article coated
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/20—Pretreatment
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/22—Servicing or operating apparatus or multistep processes
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- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
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- Organic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses an automobile body electrophoretic coating method, which comprises the following steps: firstly, degreasing and phosphating, namely cleaning an automobile body, then sending the cleaned automobile body to a degreasing step to remove internal impurities at the temperature of 55-65 ℃ for 3min, wherein the free alkali of degreasing liquid is 12-18pt, then washing with water for 1-2min at normal temperature, washing with pure water again for 1-2min at normal temperature, and then carrying out phosphating operation at the temperature of 32-38 ℃ and the total acidity of phosphating liquid of 20-24pt to form phosphating crystal grains on the surface of the automobile body; according to the electrophoretic coating method for the automobile body, disclosed by the invention, through degreasing, phosphating, electrophoretic coating, cleaning, dewatering and drying, impurities on the surface of the automobile body are reduced in the electrophoretic coating process of the automobile body, and meanwhile, the surface of the automobile body after electrophoretic coating is free from foaming, so that the quality of the finished automobile is improved, the surface smoothness is high, and the automobile body has a good use prospect.
Description
Technical Field
The invention belongs to the technical field of automobile processing, and particularly relates to an automobile body electrophoretic coating method.
Background
Electrophoretic coating is a coating method in which particles such as pigments and resins suspended in an electrophoretic fluid are directionally migrated by an external electric field and deposited on the surface of a substrate, which is one of electrodes; the invention of the principle of electrophoretic coating is at the end of the 20 th century and the 30 th century, but the development of the technology and the industrial application thereof are that after 1963, electrophoretic coating is a special coating forming method developed in the last 30 years, and is a construction process which has the most practical significance for water-based paint. The water-soluble and nontoxic paint has the characteristics of water solubility, no toxicity, easy automation control and the like, and can be rapidly and widely applied to industries such as automobiles, building materials, hardware, household appliances and the like;
the conventional electrophoretic coating has defects during processing, the surface of the conventional electrophoretic coating is prone to generating flowers after processing, subsequent processing and the quality of an automobile finished product are affected, and meanwhile, the electrophoretic coating is inconvenient to use due to the quality defects that the thickness state of the electrophoretic coating is inconsistent, roughness occurs and the like.
Disclosure of Invention
The invention mainly aims to provide an automobile body electrophoretic coating method which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
the electrophoretic coating method for the automobile body comprises the following steps:
firstly, cleaning an automobile body, then, sending the cleaned automobile body to a degreasing step to remove internal impurities, wherein the temperature is 55-65 ℃, the time is 3min, the free alkali of degreasing liquid is 12-18pt, then, washing is carried out by adopting water, the washing time at normal temperature is 1-2min, pure water is adopted again, the washing time at normal temperature is 1-2min, then, phosphating operation is carried out, the phosphating temperature is 32-38 ℃, and the total acidity of phosphating liquid is 20-24pt, so that phosphating crystal grains are formed on the surface of the automobile body, and after the phosphating treatment is finished, the automobile body is cleaned by adopting a cleaning method and time after degreasing and phosphating for later use, so that the automobile body after degreasing and phosphating is obtained;
step two, electrophoretic coating, namely, the automobile body electrophoretic device is used for carrying out electrophoretic painting on the degreased and phosphatized automobile body, the automobile body to be coated and a corresponding electrode are placed into a water-soluble coating, after a power supply is connected, the coating is carried out for 2-5 hours, the electrophoretic temperature is 28 +/-1 ℃, so that a water-insoluble paint film with the thickness of 7-15 mu m is formed on the surface of the automobile body by resin and pigment in the coating, and the electrophoretic roughness of the automobile body is less than or equal to 0.25Ra, so as to obtain the automobile body after electrophoretic coating;
step three, cleaning and dewatering, namely sending the obtained automobile body subjected to electrophoretic coating into a large-flow rinsing water ultrafiltration step, wherein the rinsing time is not more than 5min, so as to recover redundant electrophoretic paint, then adopting a first water washing method, finally utilizing pure water to remove impurities of the residual automobile body, then inclining the automobile body to dump accumulated water, blowing off water drops on the surface of the automobile body by adopting a manual air blowing method, and controlling the temperature of hot air at 30-40 ℃ to obtain the cleaned and dewatered automobile body;
and step four, drying, namely drawing the cleaned and dewatered automobile body to an inner cavity of an electrophoresis drying device for drying by using a conveying chain of a vertical chain conveyor on the ground, wherein the drying temperature is 100-120 ℃, standing the automobile body for natural cooling, and thus finishing the automobile body electrophoresis coating method and finally obtaining the electrophoresis coating film without surface flowering.
Preferably, the cleaning in the step one is carried out by using hot water for 50-60s before degreasing.
Preferably, the water-soluble coating in the second step is prepared from the following raw materials in parts by mass: 20-40 parts of epoxy resin, 0.5-1.5 parts of emulsifier, 40-50 parts of deionized water, 12-17 parts of water-based emulsion, 5-12 parts of cosolvent, 12-15 parts of electrophoretic cross-linking agent and 9-14 parts of PH regulator, and the preparation method comprises the following steps: adding epoxy resin and cosolvent into a reaction kettle, heating to 90 ℃, and stirring until the resin is completely dissolved; and then adding the electrophoretic paint cross-linking agent into a reaction kettle, controlling the temperature at 60-65 ℃, stirring for 1 hour, uniformly stirring, adding an emulsifier, deionized water and a water-based emulsion, stirring, and finally adding a proper amount of ph regulator for regulation to finally obtain the water-soluble paint with excellent stability.
Preferably, the cosolvent is propylene glycol methyl ether and the pH adjusting agent is acetic acid.
Preferably, the thickness of the electrophoretic coating layer after electrophoretic coating is controlled within the range of 10-15 μm, so as to avoid the inconsistency of the coating thickness.
Preferably, in the drying process in the fourth step, the temperature of the vehicle body is ensured to be 65-85 ℃, and the drying time is 30-40 min.
Compared with the prior art, the invention has the following beneficial effects: the automobile body electrophoretic coating method reduces impurities on the surface of the automobile body in the electrophoretic coating process through the steps of degreasing, phosphating, electrophoretic coating, cleaning, dewatering, drying and the like, the thickness of a film of the electrophoretic coating is within a controllable range, the quality of an automobile finished product is improved, hot air dewatering is added, the residual water drops after cleaning are not on the automobile coating film, the surface flowering condition after the automobile electrophoretic coating film is avoided, the surface smoothness is high, the coating used for the electrophoretic coating has stability, the coating is not easy to fall off, and the method is simple to operate and convenient to use.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Examples
During electrophoretic coating, firstly degreasing and phosphating, namely cleaning an automobile body, cleaning the automobile body by hot water before degreasing for 55s, then sending the automobile body to a degreasing step to remove internal impurities, wherein the temperature is 65 ℃, the time is 3min, the free alkali of degreasing liquid is 14pt, then washing by water, the cleaning time at normal temperature is 1min, washing by pure water again, the cleaning time at normal temperature is 1.5min, then performing phosphating operation, adopting low-temperature phosphating, the phosphating temperature is 34 ℃, and the total acidity of phosphating liquid is 22pt, so that phosphating crystal grains are formed on the surface of the automobile body, and cleaning by a degreasing cleaning method and time after phosphating is finished for later use to obtain the degreased and phosphated automobile body; and secondly, electrophoretic coating, namely, the automobile body electrophoretic device is used for electrophoretic painting of the degreased and phosphatized automobile body, the automobile body to be coated and a corresponding electrode are placed into a water-soluble coating, and after a power supply is connected, the coating is carried out for 3 hours, the electrophoretic temperature is 28 +/-1 ℃, so that resin and pigment filler in the coating form a water-insoluble paint film of about 10 mu m on the surface of the automobile body, and the water-soluble coating is prepared from the following raw material components in mass: 35 parts of epoxy resin, 0.5 part of emulsifier, 40 parts of deionized water, 13 parts of water-based emulsion, 7 parts of cosolvent, 12 parts of electrophoretic crosslinking agent and 9 parts of pH regulator, wherein the preparation method comprises the following steps: adding epoxy resin and cosolvent into a reaction kettle, heating to 90 ℃, and stirring until the resin is completely dissolved; adding an electrophoretic paint cross-linking agent into a reaction kettle, controlling the temperature at 65 ℃, stirring for 1 hour, uniformly stirring, adding an emulsifier, deionized water and a water-based emulsion, stirring, and finally adding a proper amount of a PH regulator for regulation to finally obtain a water-soluble paint with excellent stability, wherein a cosolvent is propylene glycol methyl ether, a PH regulator is acetic acid, and the electrophoretic roughness of the automobile body is less than or equal to 0.25Ra, so as to obtain the automobile body after electrophoretic coating; then cleaning and dewatering, sending the obtained automobile body subjected to electrophoretic coating into a large-flow rinsing water ultrafiltration step, wherein the rinsing time is not more than 5min, recovering redundant electrophoretic paint, then adopting a first water washing method, finally utilizing pure water to remove impurities of the residual automobile body, then inclining the automobile body to dump accumulated water, blowing off water drops on the surface of the automobile body by adopting a manual air blowing method, and controlling the temperature of hot air at 32 ℃ to obtain the cleaned and dewatered automobile body; and finally, drying, namely drawing the cleaned and dewatered automobile body to an inner cavity of an electrophoresis drying device for drying by using a conveying chain of a vertical chain conveyor on the ground, wherein the drying temperature is 110 ℃, the temperature of the automobile body is required to be 70 ℃ in the drying process, the drying time is 30min, and then standing the automobile body for natural cooling to finish the automobile body electrophoresis coating method.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The automobile body electrophoretic coating method is characterized by comprising the following steps:
firstly, cleaning an automobile body, then, sending the cleaned automobile body to a degreasing step to remove internal impurities, wherein the temperature is 55-65 ℃, the time is 3min, the free alkali of degreasing liquid is 12-18pt, then, washing is carried out by adopting water, the washing time at normal temperature is 1-2min, pure water is adopted again, the washing time at normal temperature is 1-2min, then, phosphating operation is carried out, the phosphating temperature is 32-38 ℃, and the total acidity of phosphating liquid is 20-24pt, so that phosphating crystal grains are formed on the surface of the automobile body, and after the phosphating treatment is finished, the automobile body is cleaned by adopting a cleaning method and time after degreasing and phosphating for later use, so that the automobile body after degreasing and phosphating is obtained;
step two, electrophoretic coating, namely, the automobile body electrophoretic device is used for carrying out electrophoretic painting on the degreased and phosphatized automobile body, the automobile body to be coated and a corresponding electrode are placed into a water-soluble coating, after a power supply is connected, the coating is carried out for 2-5 hours, the electrophoretic temperature is 28 +/-1 ℃, so that a water-insoluble paint film with the thickness of 7-15 mu m is formed on the surface of the automobile body by resin and pigment in the coating, and the electrophoretic roughness of the automobile body is less than or equal to 0.25Ra, so as to obtain the automobile body after electrophoretic coating;
step three, cleaning and dewatering, namely sending the obtained automobile body subjected to electrophoretic coating into a large-flow rinsing water ultrafiltration step, wherein the rinsing time is not more than 5min, so as to recover redundant electrophoretic paint, then adopting a first water washing method, finally utilizing pure water to remove impurities of the residual automobile body, then inclining the automobile body to dump accumulated water, blowing off water drops on the surface of the automobile body by adopting a manual air blowing method, and controlling the temperature of hot air at 30-40 ℃ to obtain the cleaned and dewatered automobile body;
and step four, drying, namely drawing the cleaned and dewatered automobile body to an inner cavity of an electrophoresis drying device for drying by using a conveying chain of a vertical chain conveyor on the ground, wherein the drying temperature is 100-120 ℃, standing the automobile body for natural cooling, and thus finishing the automobile body electrophoresis coating method and finally obtaining the electrophoresis coating film without surface flowering.
2. The electrodeposition coating method for an automobile body according to claim 1, wherein: in the step one, hot water is adopted for cleaning before degreasing, and the time is 50-60 s.
3. The electrodeposition coating method for an automobile body according to claim 1, wherein: the water-soluble coating in the second step is prepared from the following raw materials in parts by mass: 20-40 parts of epoxy resin, 0.5-1.5 parts of emulsifier, 40-50 parts of deionized water, 12-17 parts of water-based emulsion, 5-12 parts of cosolvent, 12-15 parts of electrophoretic cross-linking agent and 9-14 parts of PH regulator, and the preparation method comprises the following steps: adding epoxy resin and cosolvent into a reaction kettle, heating to 90 ℃, and stirring until the resin is completely dissolved; and then adding the electrophoretic paint cross-linking agent into a reaction kettle, controlling the temperature at 60-65 ℃, stirring for 1 hour, uniformly stirring, adding an emulsifier, deionized water and a water-based emulsion, stirring, and finally adding a proper amount of ph regulator for regulation to finally obtain the water-soluble paint with excellent stability.
4. The electrodeposition coating method for an automobile body according to claim 3, wherein: the cosolvent is propylene glycol methyl ether, and the pH regulator is acetic acid.
5. The electrodeposition coating method for an automobile body according to claim 1, wherein: in the second step, the thickness of the electrophoretic coating layer after electrophoretic coating is controlled within the range of 10-15 μm, so that the inconsistency of the coating thickness is avoided.
6. The electrodeposition coating method for an automobile body according to claim 1, wherein: in the fourth step, the drying process needs to ensure that the temperature of the vehicle body is 65-85 ℃ and the drying time is 30-40 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010770373.2A CN111876814A (en) | 2020-08-04 | 2020-08-04 | Automobile body electrophoretic coating method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010770373.2A CN111876814A (en) | 2020-08-04 | 2020-08-04 | Automobile body electrophoretic coating method |
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| CN111876814A true CN111876814A (en) | 2020-11-03 |
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| CN202010770373.2A Pending CN111876814A (en) | 2020-08-04 | 2020-08-04 | Automobile body electrophoretic coating method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113046814A (en) * | 2021-03-10 | 2021-06-29 | 江苏特丽亮镀膜科技有限公司 | Electrophoresis working platform and method |
| CN113702475A (en) * | 2021-08-04 | 2021-11-26 | 东风本田汽车有限公司 | Simulation test method for pollution degree of body-in-white welding glue to coating tank liquid |
| CN114262924A (en) * | 2021-12-31 | 2022-04-01 | 江苏亚如捷车业有限公司 | Electrophoresis process for producing automobile rear top cover |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108360043A (en) * | 2018-01-04 | 2018-08-03 | 湖南吉利汽车部件有限公司 | A kind of Car Body Painting method |
| CN109537028A (en) * | 2018-11-08 | 2019-03-29 | 天津磊峰实业有限公司 | A kind of automobile parts electrophoresis coating method |
| CN111088515A (en) * | 2019-12-31 | 2020-05-01 | 枣阳市旺前电泳涂料有限公司 | High-throwing-power electrophoretic paint mixing tank method |
-
2020
- 2020-08-04 CN CN202010770373.2A patent/CN111876814A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108360043A (en) * | 2018-01-04 | 2018-08-03 | 湖南吉利汽车部件有限公司 | A kind of Car Body Painting method |
| CN109537028A (en) * | 2018-11-08 | 2019-03-29 | 天津磊峰实业有限公司 | A kind of automobile parts electrophoresis coating method |
| CN111088515A (en) * | 2019-12-31 | 2020-05-01 | 枣阳市旺前电泳涂料有限公司 | High-throwing-power electrophoretic paint mixing tank method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113046814A (en) * | 2021-03-10 | 2021-06-29 | 江苏特丽亮镀膜科技有限公司 | Electrophoresis working platform and method |
| CN113702475A (en) * | 2021-08-04 | 2021-11-26 | 东风本田汽车有限公司 | Simulation test method for pollution degree of body-in-white welding glue to coating tank liquid |
| CN113702475B (en) * | 2021-08-04 | 2023-10-27 | 东风本田汽车有限公司 | Simulation test method for pollution degree of welding glue of white car body to coating bath liquid |
| CN114262924A (en) * | 2021-12-31 | 2022-04-01 | 江苏亚如捷车业有限公司 | Electrophoresis process for producing automobile rear top cover |
| CN114262924B (en) * | 2021-12-31 | 2023-03-07 | 江苏亚如捷车业有限公司 | Electrophoresis process for producing automobile rear top cover |
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Application publication date: 20201103 |
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