WO2017057883A1

WO2017057883A1 - System for managing quality of paint for electrodeposition, and method for managing quality of paint for electrodeposition using same

Info

Publication number: WO2017057883A1
Application number: PCT/KR2016/010760
Authority: WO
Inventors: 김선영
Original assignee: 대영엔지니어링 주식회사
Priority date: 2015-09-30
Filing date: 2016-09-26
Publication date: 2017-04-06
Also published as: KR20170038385A; KR101731614B1

Abstract

The present invention relates to a system for managing the quality of a paint for electrodeposition, and a method for managing the quality of a paint for electrodeposition using the same. The system for managing the quality of a paint for electrodeposition according to the present invention comprises: an electrodeposition bath in which an object to be electrodeposited is immersed and electrodeposited, and a paint is accommodated; an ion resin part which is in fluid communication with the electrodeposition bath and comprises a cation resin and an anion resin; and a control part which controls the operation of the ion resin part and the electrodeposition bath.

Description

Electrodeposition Coating Quality Management System and Electrodeposition Coating Quality Management Method Using the Same

The present invention relates to an electrodeposition coating quality management system and an electrodeposition coating quality management method using the same.

Coating is used for electrodeposition coating, and as the electrodeposition coating proceeds, the quality of the paint decreases, and various appearance defects occur in the electrodeposition coating.

In small-capacity installations, the paint quality is disposed of and discarded. However, a problem arises in that the paint cost increases due to disposal. In particular, large-capacity equipment uses a lot of paint, so the cost of disposal is greatly increased.

The present invention provides an electrodeposition coating quality management system excellent in quality control and an electrodeposition coating quality management method using the same.

An object of the present invention is the electrodeposition coating paint quality management system, the electrodeposition coating is electrodeposited coating is immersed electrodeposition and the coating is accommodated; An ion resin portion in fluid communication with the electrodeposition tank and including the cation resin and the anion resin; It is achieved by including a control unit for controlling the operation of the electrodeposition tank and the ion resin unit.

The paint may include an acrylic resin and a melanin resin, and a carboxylic acid may be attached to the acrylic resin terminal.

The ion resin unit may include an anion resin unit including the anion resin and a cation resin unit including the cationic resin.

The electrodeposition tank, the anion resin portion, the cation resin portion may be connected in series and the anion resin portion may be directly connected to the electrodeposition tank.

The anion resin may be a strong base anion resin based on styrene-divinylbenzene.

The cation exchange resin may comprise a carboxylated polyacrylate.

The control unit may pass the paint through the anion resin so that the conductivity of the paint is lower than a predetermined value.

The control unit may pass the paint through the cationic resin so that the amine equivalent (meq) of the paint is lower than a predetermined value.

The controller may pass the paint through the cationic resin so that the pH of the paint is lower than a predetermined value.

The method may further include an anion resin regeneration unit including a sodium hydroxide solution for regenerating the anion resin.

A cationic resin regeneration unit including an ammonia solution and a hydrochloric acid solution for regenerating the cationic resin may be further included.

An object of the present invention is a quality control method of the paint used for electrodeposition coating, the step of checking the physical properties of the paint; Determining whether the paint passes through the ion resin according to the identified physical properties; According to the determination may include passing the paint through the ion resin.

The ion resin may include an anion resin and a cationic resin.

The quality includes conductivity, and may include passing the paint through the anion resin so that the conductivity of the paint is lower than a predetermined value.

The quality includes an amine equivalent (meq), and the paint may be passed through the cationic resin so that the amine equivalent of the paint is lower than a predetermined value.

The quality includes a pH, and may include passing the paint through the cationic resin so that the pH of the paint is lower than a predetermined value.

According to the present invention, there is provided an electrodeposition coating quality management system excellent in quality control and an electrodeposition coating quality management method using the same.

1 shows an electrodeposition coating quality management system according to an embodiment of the present invention,

Figure 2 shows the electrical conductivity management flow chart of the tank paint according to an embodiment of the present invention,

Figure 3 shows an amine equivalent management flowchart of the electrodeposition coating according to an embodiment of the present invention,

Figure 4 shows the pH management flow chart of the electrodeposition coating according to an embodiment of the present invention.

1 shows an electrodeposition coating quality management system according to an embodiment of the present invention.

The paint quality management system 1 includes an electrodeposition tank 10, an ion resin unit 20, and a regeneration unit 30 in which paint is placed and electrodeposition coating is performed. The paint moves the electrodeposition tank 10 and the ion resin portion 20, which is controlled by a controller (not shown). The control unit may include a pump and a valve to control the transfer of paint. In addition, although not given a number, the pipe is connected between the electrodeposition tank 10 and the ion resin portion 20.

The regeneration unit 30 includes a first regeneration unit 31 for regenerating the anion resin unit 21 and a second regeneration unit 32 for regenerating the cation resin unit 22.

The quality control target paint of the present invention is not limited thereto, but may include an acrylic resin and a melanin resin, and a carboxylic acid may be attached to the acrylic resin terminal. By using such anion pure acrylic electrodeposited resin, high gloss and a metallic feeling can be obtained. The weight of the paint located in the electrodeposition tank 10 during the electrodeposition process is not limited thereto, and may be 5 to 10 tons or more, for example, 10 to 15 tons, 10 to 20 tons, or 10 tons. It may be 50 tons.

Paint according to the invention can be used for transparent electrodeposition coating of a variety of materials, such as stainless steel, aluminum, iron.

The ion resin unit 20 includes an anion resin unit 21 and a cationic resin unit 22. The anion resin part 21 and the cation resin part 22 are connected in series with the electrodeposition tank 10. In another embodiment, the electrodeposition tank 10 may be independently connected through separate pipes. In the operation of the paint, it is preferable to pass only the anion resin, or pass the anion resin first and then the cationic resin. This is because if the paint passes through only the cationic resin, the paint may have a high probability of replacing the amine above the reference value, which may cause problems in the paint stability.

The anion resin unit 21 is a tower-type reactor is filled with anion resin inside. The anion resin may be a strong base anion resin based on styrene-divinylbenzene, but is not limited thereto, and may use TRILITE-SAR20MB. The cation resin part 22 is also a tower type reactor, and the cation resin is filled therein. The cationic resin may be a carboxylated polyacrylate series, for example, WK60L may be used.

If it is determined that the physical properties of the paint need to be managed, the control unit manages the physical properties of the paint by passing the paint through the anion resin unit 21 and / or the cation resin unit 22. The physical properties of the paint are not limited thereto, and may include electrical conductivity, amine equivalent weight and pH.

Hereinafter, a quality control method of electrodeposition coating will be described with reference to FIGS. 2 to 4.

Figure 2 is a flow chart for managing the conductivity of the electrodeposition coating paint in one embodiment of the present invention, Figure 3 is a flow chart for managing the amine equivalent of the electrodeposition coating paint in one embodiment of the present invention, Figure 4 In one embodiment of the flow chart for managing the pH of the electrodeposition coating.

Referring to Figure 2 describes the conductivity management of the paint.

As the electrodeposition coating proceeds, impurities (cationic ions) in the pretreatment bath flow into the electrodeposition bath and conductivity increases. If the conductivity is excessively increased, the film thickness decreases, and if the conductivity is excessively reduced, the stability of the paint decreases.

The pretreatment tank is a process of surface treatment of the product before coating the product (electrodeposition object), there may be a degreasing process for removing oil or foreign matter and a chemical conversion process for improving corrosion resistance.

As the electrodeposition coating progresses, the conductivity of the paint increases, so the upper limit of the conductivity of the paint should be determined and managed so that the conductivity becomes lower than the upper limit. To prevent the conductivity of the paint from lowering below the lower limit, replenish the paint.

In the present invention, "managing a specific physical property (lower than a certain numerical value)" includes various control methods. For example, it is possible to always control the specific property to be located within a specific range (management range), or to start management if the specific value is exceeded (the specific value may be lower than the upper limit). Here, the upper limit and the lower limit of the specific range (control range), specifically, the physical property to be managed may vary depending on the specific process environment and / or required quality.

Specifically, first, the conductivity of the paint is measured (S11). The conductivity of the paint is not limited thereto, but may be measured for the paint in the electrodeposition tank 10 and may be performed by a known method. The conductivity of the paint can be measured at all times or at regular time intervals. In addition, the measurement frequency can be increased when the upper limit or the lower limit of a specific range (management range) is approached.

Next, it is determined whether the measured value is a level that requires management (S12). In this step, various conventional judgment methods may be used, such as viewing and predicting a change in conductivity of the paint over time.

After the management is determined to be a necessary level to allow the paint in the electrodeposition tank 10 to pass through the anion resin (S13). As a result, as the paint passes through the anion resin, the cationic ions are substituted and the conductivity decreases.

Next, with reference to FIG. 3, the amine equivalent control of paint is demonstrated.

As the electrodeposition coating proceeds, the amines surrounding the acrylic resin dissociate and remain in the electrodeposition tank. This increases the amine equivalent weight of the paint. Excessively high amine equivalents result in a problem of reduced electrodeposition leveling and a decrease in coating thickness. Excessively low amine equivalents reduce paint stability and increase coating thickness. That is, it is important for the smoothness management of amine equivalent paint.

As the electrodeposition coating proceeds, the amine equivalent of the paint increases, so the upper limit of the amine equivalent of the paint should be determined and managed so that the amine equivalent is lower than the upper limit. To prevent the amine equivalent of the paint from lowering the lower limit, amine is replenished.

Specifically, first, the amine equivalent of the paint is measured (S21). The amine equivalent of the paint is not limited thereto, but may be measured for the paint in the electrodeposition tank 10 and may be performed by a known method. The amine equivalent of the paint can be measured at all times or at regular time intervals. In addition, the measurement frequency can be increased when the upper limit or the lower limit of a specific range (management range) is approached.

Next, it is determined whether the measured value is a level that requires management (S22). In this step, various conventional judgment methods can be used, such as predicting and predicting changes in amine equivalents of the paint over time.

After the management is determined to be necessary level to allow the paint in the electrodeposition tank 10 to pass through the cation resin (S23). As the paint passes through the cationic resin, the amine is substituted and the amine equivalent decreases.

Next, the pH control of the paint will be described with reference to FIG. 4.

As the electrodeposition coating progresses, weakly alkaline anions such as amines surrounding the acrylic resin dissociate and remain in the electrodeposition tank. This raises the pH of the paint. Excessively high pH lowers the stability of the paint and causes poor appearance. Too low a pH also lowers the stability of the paint.

As the electrodeposition coating proceeds, the pH of the paint increases, so the pH upper limit of the paint must be determined and the pH lower than the upper limit should be managed. In order to prevent the pH of the paint from lowering the lower limit, amine may be replenished.

Specifically, first, the pH of the paint is measured (S31). The amine equivalent of the paint is not limited thereto, but may be measured for the paint in the electrodeposition tank 10 and may be performed by a known method. The amine equivalent of the paint can be measured at all times or at regular time intervals. In addition, the measurement frequency can be increased when the upper limit or the lower limit of a specific range (management range) is approached.

Next, it is determined whether the measured value is a level that requires management (S32). In this step, various conventional judgment methods may be used, such as viewing and predicting the pH change of the paint over time.

After the management is determined to be necessary level to allow the paint in the electrodeposition tank 10 to pass through the cation resin (S33). As a result, the paint passes through the cationic resin, and the pH is lowered while the weakly alkaline anions such as amines are substituted.

Although not described above with reference to FIGS. 2 to 4, when the physical properties of the paint enter a predetermined value through the passage of the ion resin, the passage of the ion resin of the paint may be stopped.

Ion resins can also be recycled if necessary. The anion resin is regenerated using a regeneration solution containing a sodium hydroxide solution using the first regeneration unit 31, and the cation resin is regeneration solution containing an ammonia solution and a hydrochloric acid solution using the second regeneration unit 32. Can be played using.

The necessity of the regeneration process and the specific regeneration method can be carried out by known techniques.

According to the present invention, when the line operation is close to the upper and lower limit limits, it is possible to take preliminary measures and analyzes according to expectations. In addition, it is possible to efficiently operate the paint and line according to the trend of production output. At the same time, it is possible to quickly identify and cope with the occurrence of a problem, to efficiently operate raw materials, and to increase productivity by managing a defective rate.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Could be. Accordingly, the true scope of protection of the invention should be defined only by the appended claims.

Claims

In electrodeposition coating quality management system,

An electrodeposition tank in which the object to be electrodeposited is immersed and the paint is accommodated;

An ion resin portion in fluid communication with the electrodeposition tank and including the cation resin and the anion resin;

Electrodeposit coating quality control system including a control unit for controlling the operation of the electrodeposition tank and the ion resin.
The method of claim 1,

The paint includes an acrylic resin and a melanin resin, the electrodeposition coating quality management system, characterized in that the carboxylic acid is attached to the acrylic resin end.
The method of claim 1,

Electrodeposit coating quality control system, characterized in that the ion resin portion comprises an anion resin portion including the anion resin and a cation resin portion containing the cation resin.
The method of claim 3,

Electrodeposit coating quality control system, characterized in that the electrodeposition tank, the anion resin portion, the cation resin portion is connected in series and the anion resin portion is directly connected to the electrodeposition tank.
The method of claim 4, wherein

Electrodeposit coating quality control system, characterized in that the anionic resin is a strong basic anion resin based on styrene-divinylbenzene.
The method of claim 4, wherein

Electrodeposit coating quality management system, characterized in that the cation exchange resin comprises a carboxylated polyacrylate.
The method of claim 4, wherein

And the control unit passes the paint through the anion resin so that the conductivity of the paint is lower than a predetermined value.
The method of claim 4, wherein

And the control unit passes the paint through the cationic resin so that the amine equivalent (meq) of the paint is lower than a predetermined value.
The method of claim 4, wherein

The control unit is electrodeposition coating paint quality management system, characterized in that to pass the paint through the cationic resin so that the pH of the paint is lower than a predetermined value.
The method of claim 4, wherein

Electrodeposit coating quality control system further comprising an anionic resin regeneration unit comprising a sodium hydroxide solution for regenerating the anionic resin.
The method of claim 4, wherein

Electrodeposit coating quality control system further comprising a cationic resin regeneration unit comprising ammonia solution and hydrochloric acid solution for regenerating the cationic resin.
In the quality control method of the paint used for electrodeposition coating,

Confirming physical properties of the paint;

Determining whether the paint passes through the ion resin according to the identified physical properties;

Quality control method of electrodeposition coating paint comprising the step of passing the paint through the ion resin according to the determination.
The method of claim 12,

The paint includes an acrylic resin and a melanin resin, the quality control method of the electrodeposition coating paint, characterized in that the carboxylic acid is attached to the acrylic resin end.
The method of claim 12,

The ion resin quality control method of the electrodeposition coating, characterized in that it comprises an anionic resin and a cationic resin.
The method of claim 14,

The quality includes conductivity,

And passing the paint through the anion resin so that the conductivity of the paint is lower than a predetermined value.
The method of claim 14,

The quality comprises an amine equivalent (meq),

Quality control method of the electrodeposition coating paint, characterized in that the paint is passed through the cationic resin so that the amine equivalent of the paint is lower than a predetermined value.
The method of claim 14,

The quality comprises pH,

Quality control method of the electrodeposition coating paint comprising the step of passing the paint through the cationic resin so that the pH of the paint is lower than a predetermined value.