Electrophoresis part spray degreasing process

Abstract

The invention relates to the technical field of electrophoresis, and provides an electrophoresis piece spray degreasing process which comprises the following steps: a first cleaning procedure: carrying out first cleaning treatment on a to-be-cleaned electrophoresis piece so as to clean off part of impurities on the surface of the electrophoresis piece; a first degreasing process: spraying an alkaline degreasing agent to the surface of the electrophoresis part subjected to the first cleaning process to perform first degreasing treatment so as to remove part of grease; a second degreasing process: enabling a solution containing bio-enzyme to form atomized liquid, and enabling the atomized liquid to be in contact with the surface of the electrophoresis part subjected to the first degreasing process for second degreasing treatment so as to remove residual grease; a second cleaning process: carrying out second cleaning treatment on the electrophoresis piece subjected to the second degreasing process so as to clean away residual impurities on the surface of the electrophoresis piece; the process disclosed by the invention has a good degreasing effect and is beneficial to forming a good coating.

Description

Technical Field

[0001] This application relates to the field of electrophoresis technology, and particularly to a spray degreasing process for electrophoresis parts. Background Art

[0002] Degreasing of electrophoretic parts is an important step in the electrophoretic coating process, and the quality of degreasing can affect the adhesion of the electrophoretic coating. The main purpose of degreasing electrophoretic parts is to remove oil, grease and other impurities on the surface of electrophoretic parts so that the electrophoretic coating can adhere evenly to the surface of electrophoretic parts and form a good coating. In the prior art, a Chinese invention patent with the publication number CN109530300A discloses an electrophoretic part degreasing spray system, including a spray chamber and a cleaning liquid tank. The spray chamber is located above the cleaning liquid tank, and the bottom of the spray chamber is communicated with the cleaning liquid tank through a conduit; a hanging device for hanging electrophoretic parts is provided on the top wall of the spray chamber, and several spray heads are provided on the inner wall of the spray chamber. The spray orifice of each spray head faces the center of the spray chamber, and each spray head communicates with a first through pipe. The water inlet of the first through pipe is connected to the water outlet of a first water pump arranged in the cleaning liquid tank; the cleaning liquid tank is respectively communicated with a water tank, a degreasing agent tank and an activator tank through a first water conveying device, a second water conveying device and a third water conveying device. A pH value sensor and a concentration sensor for detecting the concentration of the degreasing agent are arranged in the cleaning liquid tank to understand the content of the degreasing agent and the surfactant in the cleaning liquid in real time, so as to facilitate the accurate addition of the degreasing agent and the surfactant and ensure the degreasing quality of electrophoretic parts. A Chinese utility model patent with the publication number CN211247569U discloses a pre-degreasing device for electrophoretic paint coating, including a degreasing tank, a support plate, a base plate, a hot air blower, an air duct, a fixing plate, a rotating motor, an electric hydraulic rod, a circular fixing plate, a support rod, a ball valve, a drain pipe, an air shell, a support column, a brush group, a U-shaped plate, a handle, a threaded block, a threaded rod, a clamping plate, a rubber gasket and an air hole. The beneficial effect of this utility model is that the device clamps and fixes the workpiece to be coated through a fixing structure. After clamping and fixing, the workpiece rotates up and down in the degreasing liquid under the action of the electric hydraulic rod and the rotating motor, which improves the degreasing efficiency. During the rotation process, the brush group inside the circular fixing plate brushes the workpiece, making the degreasing effect more thorough. Another Chinese utility model patent with the publication number CN210816423U discloses a degreasing device for electrophoretic coating of automobile parts, including a waste water tank. Two columns are symmetrically and fixedly connected to the base surface of the waste water tank of the two columns respectively. The two columns are hollow, and two lifting rods are slidably connected to the inner walls respectively. Sixteen hooks are symmetrically and fixedly connected to the outer wall of the conveyor belt. The hooks are used to hang automobile parts. Support plates and first fixing plates are respectively fixedly connected to the side walls of the columns. Degreasing tanks are fixedly connected to the base surfaces of the two fixing blocks. A spray degreasing tank, an immersion degreasing tank and a washing tank are sequentially arranged inside the degreasing tank. Four vertical rods are symmetrically and vertically fixedly connected upward inside the immersion degreasing tank. Two movable plates are slidably connected to the outer walls of the four vertical rods. Its advantage lies in solving the problems of very low degreasing efficiency and insufficient degreasing in the electrophoretic coating process of automobile parts.

[0003] However, in the related art, the degreasing effect of the electrophoresis part is poor, resulting in poor quality of the subsequent formed coating. Summary of the Invention

[0004] In view of this, the present invention provides a spray degreasing process for electrophoresis parts, which has a good degreasing effect and helps to form a good coating.

[0005] The present invention provides a spray degreasing process for electrophoresis parts, comprising:

[0006] A first cleaning step of performing a first cleaning treatment on the electrophoresis part to be cleaned to remove part of the impurities on the surface of the electrophoresis part;

[0007] A first degreasing step of spraying an alkaline degreasing agent onto the surface of the electrophoresis part that has undergone the first cleaning step for a first degreasing treatment to remove part of the grease;

[0008] A second degreasing step of forming an atomized liquid of a solution containing bio-enzyme and contacting the surface of the electrophoresis part that has undergone the first degreasing step for a second degreasing treatment to remove the remaining part of the grease;

[0009] A second cleaning step of performing a second cleaning treatment on the electrophoresis part that has undergone the second degreasing step to remove the remaining impurities on the surface of the electrophoresis part.

[0010] According to any of the foregoing embodiments of the present invention, in the first degreasing step, the alkaline degreasing agent comprises a metal hydroxide, an alkaline ionic liquid, and water.

[0011] According to any of the foregoing embodiments of the present invention, the mass ratio of the metal hydroxide to the alkaline ionic liquid is (1-3):(2-4).

[0012] According to any of the foregoing embodiments of the present invention, the mass proportion of the metal hydroxide in the alkaline degreasing agent is 20%-30%; and / or, the mass proportion of the alkaline ionic liquid in the alkaline degreasing agent is 30%-40%.

[0013] According to any of the foregoing embodiments of the present invention, the alkaline ionic liquid comprises a quaternary amine-based alkaline ionic liquid.

[0014] According to any of the foregoing embodiments of the present invention, the alkaline degreasing agent comprises an anionic surfactant, wherein the mass proportion of the anionic surfactant in the alkaline degreasing agent is 2%-5%.

[0015] According to any of the foregoing embodiments of the present invention, the temperature of the first degreasing treatment is 60°C-80°C.

[0016] According to any of the foregoing embodiments of the present invention, in the second degreasing process, the bio-enzyme includes at least one of lipase and phospholipase, and the concentration of the bio-enzyme in the solution is 0.5 g / L to 1.5 g / L.

[0017] According to any of the foregoing embodiments of the present invention, the second degreasing process is carried out 1 min - 2 min before the end of the first degreasing process.

[0018] According to any of the foregoing embodiments of the present invention, in the first cleaning process, water is used for the first cleaning treatment;

[0019] And / or, in the second cleaning process, pressurized inert gas is used for the second cleaning treatment.

[0020] The electrophoretic part spray degreasing process provided by the present invention removes some impurities of the electrophoretic part to be cleaned through the first cleaning process, which helps to improve the degreasing effect of the subsequent degreasing process; the electrophoretic part after the first cleaning process successively undergoes the first degreasing process and the second degreasing process. Among them, in the first degreasing process, an alkaline degreasing agent is used to spray the electrophoretic part to remove some grease on its surface and form an alkaline environment on its surface at the same time, which can promote the second degreasing treatment of the remaining grease by the atomized liquid containing bio-enzyme and further improve the degreasing effect; the electrophoretic part after the degreasing treatment is then cleaned in the second cleaning process to remove the remaining degreasing agent, the solution containing bio-enzyme and other impurities, thereby making the surface of the electrophoretic part cleaner. Therefore, the electrophoretic part spray degreasing process provided by the present invention has a good degreasing effect and helps to form a good coating.

[0021] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the description. And in order to make the above and other objects, features and advantages of the present invention more obvious and understandable, the following specifically gives the specific embodiments of the present invention. Brief Description of the Drawings

[0022] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. In the drawings:

[0023] Figure 1 A flow schematic diagram of the electrophoretic part spray degreasing process provided by some embodiments of the present invention is shown. Detailed Embodiments

[0024] In this text, an electrophoretic part refers to a workpiece to be processed that is coated on the surface of a metal product using electrophoretic technology. Among them, the workpiece to be processed can be a component for a vehicle or a metal component for other industrial fields.

[0025] As described in the background art, degreasing of electrophoretic parts is an important step in the electrophoretic coating process. Since the surface of electrophoretic parts will be coated with oily compounds such as lubricating oil or rust preventive oil during stamping and machining, the presence of these oily compounds will cause a serious decrease in the adhesion of the electrophoretic coating, resulting in poor coating quality. Therefore, it is necessary to remove the above-mentioned oily compounds. However, in the related art, the degreasing effect of electrophoretic parts is not good, resulting in poor quality of the subsequent formed coating.

[0026] In view of this, the present invention provides an electrophoretic part spray degreasing process, which has a good degreasing effect and helps to form a good coating.

[0027] Please refer to Figure 1 As shown, the present invention provides an electrophoretic part spray degreasing process, including:

[0028] S100, the first cleaning process, performs the first cleaning treatment on the electrophoretic part to be cleaned to remove some impurities on the surface of the electrophoretic part;

[0029] S200, the first degreasing process, sprays an alkaline degreasing agent onto the surface of the electrophoretic part that has undergone the first cleaning process for the first degreasing treatment to remove some grease;

[0030] S300, the second degreasing process, forms an atomized liquid of a solution containing biological enzymes and contacts it with the surface of the electrophoretic part that has undergone the first degreasing process for the second degreasing treatment to remove the remaining grease;

[0031] S400, the second cleaning process, performs the second cleaning treatment on the electrophoretic part that has undergone the second degreasing process to remove the remaining impurities on the surface of the electrophoretic part.

[0032] The electrophoretic part spray degreasing process provided by the present invention removes some impurities of the electrophoretic part to be cleaned through the first cleaning process, which helps to improve the degreasing effect of the subsequent degreasing process. The electrophoretic part after the first cleaning process successively undergoes the first degreasing process and the second degreasing process. Among them, in the first degreasing process, an alkaline degreasing agent is used to spray the electrophoretic part to remove some grease on its surface, and at the same time, an alkaline environment is formed on its surface, which can promote the second degreasing treatment of the remaining grease by the atomized liquid containing biological enzymes, further improving the degreasing effect. The electrophoretic part after degreasing treatment is then cleaned through the second cleaning process to remove the remaining degreasing agent, the solution containing biological enzymes, and other impurities, thereby making the surface of the electrophoretic part cleaner. Therefore, the electrophoretic part spray degreasing process provided by the present invention has a good degreasing effect and helps to form a good coating.

[0033] In some embodiments of the present invention, the first cleaning process can use water to rinse the surface of the electrophoretic part to be cleaned to remove some impurities on the surface of the electrophoretic part, such as metal debris, suspended matter, etc.

[0034] In some other embodiments of the present invention, the first cleaning process can also use the wastewater recovered during the degreasing process for rinsing.

[0035] In the first degreasing process, a suitable alkaline degreasing agent can improve the degreasing effect while reducing the degreasing cost.

[0036] In some embodiments of the present invention, the alkaline degreasing agent includes metal hydroxides and alkaline ionic liquids. The metal hydroxides and alkaline ionic liquids can cooperate with each other to promote the further decomposition of the grease on the surface of the electrophoretic part and improve the degreasing effect. Moreover, the mixed use of metal hydroxides and alkaline ionic liquids can reduce their individual usage amounts to reduce the degreasing cost.

[0037] Furthermore, in the alkaline degreasing agent, when the mass ratio of the metal hydroxide to the alkaline ionic liquid is within a suitable range, the degreasing effect of the first degreasing process can be improved.

[0038] In some embodiments of the present invention, the mass ratio of the metal hydroxide to the alkaline ionic liquid is (1 - 3):(2 - 4). When the mass ratio of the metal hydroxide to the alkaline ionic liquid is within the above range, the grease on the surface of the electrophoretic part can be quickly decomposed.

[0039] Exemplarily, the mass ratio of the metal hydroxide to the alkaline ionic liquid can be, but is not limited to, 1:2, 1:3, 1:4, 2:2, 2:3, 2:4, etc.

[0040] In some specific embodiments of the present invention, the mass ratio of the metal hydroxide in the alkaline degreasing agent is 20% - 30%. When the mass ratio of the metal hydroxide in the alkaline degreasing agent is within the above range, it can better play a synergistic role with the alkaline ionic liquid, further promote the hydrolysis of grease, and improve its degreasing effect.

[0041] Exemplarily, the mass ratio of the metal hydroxide in the alkaline degreasing agent can be, but is not limited to, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30% or any range of values composed of any two values within the range of 20% - 30%.

[0042] In some specific embodiments of the present invention, the mass ratio of the alkaline ionic liquid in the alkaline degreasing agent is 30% - 40%. When the mass ratio of the alkaline ionic liquid in the alkaline degreasing agent is within the above range, it can better play a synergistic role with the metal hydroxide, further promote the hydrolysis of grease, and improve its degreasing effect.

[0043] Exemplarily, the mass ratio of the alkaline ionic liquid in the alkaline degreasing agent can be, but is not limited to, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40% or any range of values composed of any two values within the range of 30% - 40%.

[0044] In the above embodiments, the metal hydroxide can be at least one of sodium hydroxide and potassium hydroxide. And the alkaline ionic liquid includes quaternary amine-based alkaline ionic liquids. Exemplarily, the quaternary amine-based alkaline ionic liquid can include at least one of diethylamine acetate, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-ethyl-3-methylimidazolium acetate, and 1-butyl-3-methylimidazolium hexafluorophosphate.

[0045] In some other embodiments of the present invention, the alkaline degreasing agent includes an anionic surfactant, wherein the mass ratio of the anionic surfactant in the alkaline degreasing agent is 2% - 5%. When the mass ratio of the anionic surfactant in the alkaline degreasing agent is within the above range, it can reduce the surface tension between the grease and the electrophoretic part, so as to promote the degreasing agent to wet the surface of the electrophoretic part to increase the contact area with the grease, thereby further promoting the decomposition of the grease.

[0046] In some specific embodiments of the present invention, the anionic surfactant can include sodium dodecylbenzenesulfonate.

[0047] In addition, in the first degreasing process, the first degreasing treatment is carried out at a suitable temperature and time, which can help to further improve the degreasing effect.

[0048] In some embodiments of the present invention, the temperature of the first degreasing treatment is 60°C - 80°C, and the time is 1 min - 3 min.

[0049] In the second degreasing process, the bio-enzyme includes at least one of lipase and phospholipase, and the concentration of the bio-enzyme in the solution is 0.5 g / L to 1.5 g / L. When the concentration of the bio-enzyme is within the above suitable range, it can promote the decomposition of the remaining grease and further improve the degreasing effect.

[0050] In some embodiments of the present invention, the second degreasing process is carried out 1 min - 2 min before the end of the first degreasing process. This can more effectively help the bio-enzyme decompose the grease to further improve the degreasing effect.

[0051] In some embodiments of the present invention, in the second cleaning process, pressurized inert gas is used for the second cleaning treatment. This can reduce the water consumption and the generation amount and treatment cost of wastewater.

[0052] In the above embodiments, the inert gas can be nitrogen or argon.

[0053] The following embodiments more specifically describe the content disclosed in the present invention. These embodiments are only for illustrative purposes, because various modifications and changes within the scope of the content disclosed in the present invention are obvious to those skilled in the art. Unless otherwise stated, all parts, percentages, and ratios reported in the following embodiments are based on mass, and all reagents used in the embodiments are commercially available or synthesized according to conventional methods and can be used directly without further treatment, and all instruments used in the embodiments are commercially available. Lipase: enzyme activity of 30,000 u / g, Nanjing Xinhua Yuan Chemical Co., Ltd.

[0054] Example 1

[0055] This example provides an electrophoretic part spray degreasing process, including:

[0056] Clean the aluminum part (length × width is 50 cm × 15 cm) with 1 L of water;

[0057] Spray the alkaline degreasing agent onto the surface of the aluminum part that has been washed with water and carry out the first degreasing treatment at 60 °C for 2 min. Among them, the alkaline degreasing agent includes sodium hydroxide, 1-butyl-3-methylimidazolium tetrafluoroborate, and water. The mass ratio of sodium hydroxide in the alkaline degreasing agent is 20%, and the mass ratio of 1-butyl-3-methylimidazolium tetrafluoroborate in the alkaline degreasing agent is 40%;

[0058] Form an atomized liquid of an aqueous solution containing lipase (concentration of 0.5 g / L) and contact it with the surface of the aluminum part that has undergone the first degreasing process for the second degreasing treatment for 3 min;

[0059] The aluminum parts that have undergone the second degreasing process are rinsed with pressurized nitrogen to obtain degreased aluminum parts.

[0060] Example 2

[0061] This example provides an electrophoretic part spray degreasing process, including:

[0062] The aluminum parts (length × width is 50 cm × 15 cm) are cleaned with 1 L of water;

[0063] The alkaline degreasing agent is sprayed onto the surface of the aluminum parts that have been cleaned with water and first degreased at 60°C for 2 min. Among them, the alkaline degreasing agent includes sodium hydroxide, diethylamine acetate, and water. The mass ratio of sodium hydroxide in the alkaline degreasing agent is 20%, and the mass ratio of diethylamine acetate in the alkaline degreasing agent is 40%;

[0064] An aqueous solution containing lipase (concentration of 0.5 g / L) is formed into an atomized liquid and contacted with the surface of the aluminum parts that have undergone the first degreasing process for second degreasing treatment for 3 min;

[0065] The aluminum parts that have undergone the second degreasing process are rinsed with pressurized nitrogen to obtain degreased aluminum parts.

[0066] Example 3

[0067] This example provides an electrophoretic part spray degreasing process, including:

[0068] The aluminum parts (length × width is 50 cm × 15 cm) are cleaned with 1 L of water;

[0069] The alkaline degreasing agent is sprayed onto the surface of the aluminum parts that have been cleaned with water and first degreased at 60°C for 2 min. Among them, the alkaline degreasing agent includes sodium hydroxide, 1-ethyl-3-methylimidazolium acetate, and water. The mass ratio of sodium hydroxide in the alkaline degreasing agent is 20%, and the mass ratio of 1-ethyl-3-methylimidazolium acetate in the alkaline degreasing agent is 40%;

[0070] An aqueous solution containing lipase (concentration of 0.5 g / L) is formed into an atomized liquid and contacted with the surface of the aluminum parts that have undergone the first degreasing process for second degreasing treatment for 3 min;

[0071] The aluminum parts that have undergone the second degreasing process are rinsed with pressurized nitrogen to obtain degreased aluminum parts.

[0072] Example 4

[0073] This example provides an electrophoretic part spray degreasing process, including:

[0074] The aluminum parts (length × width is 50 cm × 15 cm) are cleaned with 1 L of water;

[0075] Spray the alkaline degreaser onto the surface of the aluminum parts cleaned with water and conduct the first degreasing treatment at 60°C for 2 minutes. Among them, the alkaline degreaser includes sodium hydroxide, diethylamine acetate, and water. The mass ratio of sodium hydroxide in the alkaline degreaser is 30%, and the mass ratio of diethylamine acetate in the alkaline degreaser is 40%.

[0076] Form an atomized liquid from the aqueous solution containing lipase (concentration: 0.5 g / L) and contact it with the surface of the aluminum parts that have undergone the first degreasing process for the second degreasing treatment for 3 minutes.

[0077] Use pressurized nitrogen to rinse the aluminum parts that have undergone the second degreasing process to obtain the degreased aluminum parts.

[0078] Example 5

[0079] This example provides an electrophoretic part spray degreasing process, including:

[0080] Clean the aluminum parts (length × width: 50 cm × 15 cm) with 1 L of water.

[0081] Spray the alkaline degreaser onto the surface of the aluminum parts cleaned with water and conduct the first degreasing treatment at 60°C for 2 minutes. Among them, the alkaline degreaser includes sodium hydroxide, diethylamine acetate, and water. The mass ratio of sodium hydroxide in the alkaline degreaser is 30%, and the mass ratio of diethylamine acetate in the alkaline degreaser is 30%.

[0082] Form an atomized liquid from the aqueous solution containing lipase (concentration: 0.5 g / L) and contact it with the surface of the aluminum parts that have undergone the first degreasing process for the second degreasing treatment for 3 minutes.

[0083] Use pressurized nitrogen to rinse the aluminum parts that have undergone the second degreasing process to obtain the degreased aluminum parts.

[0084] Example 6

[0085] This example provides an electrophoretic part spray degreasing process, including:

[0086] Clean the aluminum parts (length × width: 50 cm × 15 cm) with 1 L of water.

[0087] Spray the alkaline degreaser onto the surface of the aluminum parts cleaned with water and conduct the first degreasing treatment at 60°C for 2 minutes. Among them, the alkaline degreaser includes sodium hydroxide, diethylamine acetate, and water. The mass ratio of sodium hydroxide in the alkaline degreaser is 20%, and the mass ratio of diethylamine acetate in the alkaline degreaser is 40%.

[0088] Form an atomized liquid from an aqueous solution containing lipase (concentration: 1 g / L) and bring it into contact with the surface of the aluminum parts that have undergone the first degreasing process for 3 minutes of the second degreasing treatment;

[0089] Rinse the aluminum parts that have undergone the second degreasing process with pressurized nitrogen to obtain degreased aluminum parts.

[0090] Example 7

[0091] This example provides an electrophoretic part spray degreasing process, including:

[0092] Wash the aluminum parts (length × width: 50 cm × 15 cm) with 1 L of water;

[0093] Spray the alkaline degreasing agent onto the surface of the aluminum parts that have been washed with water and perform the first degreasing treatment at 60°C for 2 minutes. Among them, the alkaline degreasing agent includes sodium hydroxide, diethylamine acetate, and water. The mass ratio of sodium hydroxide in the alkaline degreasing agent is 20%, and the mass ratio of diethylamine acetate in the alkaline degreasing agent is 40%;

[0094] Form an atomized liquid from an aqueous solution containing lipase (concentration: 1.5 g / L) and bring it into contact with the surface of the aluminum parts that have undergone the first degreasing process for 3 minutes of the second degreasing treatment;

[0095] Rinse the aluminum parts that have undergone the second degreasing process with pressurized nitrogen to obtain degreased aluminum parts.

[0096] Example 8

[0097] This example provides an electrophoretic part spray degreasing process, including:

[0098] Wash the aluminum parts (length × width: 50 cm × 15 cm) with 1 L of water;

[0099] Spray the alkaline degreasing agent onto the surface of the aluminum parts that have been washed with water and perform the first degreasing treatment at 60°C for 3 minutes. Among them, the alkaline degreasing agent includes sodium hydroxide, diethylamine acetate, and water. The mass ratio of sodium hydroxide in the alkaline degreasing agent is 20%, and the mass ratio of diethylamine acetate in the alkaline degreasing agent is 40%;

[0100] Form an atomized liquid from an aqueous solution containing lipase (concentration: 0.5 g / L) and bring it into contact with the surface of the aluminum parts that have undergone the first degreasing process for 3 minutes of the second degreasing treatment;

[0101] Rinse the aluminum parts that have undergone the second degreasing process with pressurized nitrogen to obtain degreased aluminum parts.

[0102] Example 9

[0103] This example provides an electrophoretic part spray degreasing process, including:

[0104] Wash the aluminum parts (length × width: 50 cm × 15 cm) with 1 L of water;

[0105] Spray the alkaline degreaser onto the surface of the aluminum parts that have been washed with water and conduct the first degreasing treatment at 60°C for 2 min. The alkaline degreaser includes sodium hydroxide, diethylamine acetate, 1-ethyl-3-methylimidazolium acetate, and water. The mass ratio of sodium hydroxide in the alkaline degreaser is 20%, the mass ratio of diethylamine acetate in the alkaline degreaser is 20%, and the mass ratio of 1-ethyl-3-methylimidazolium acetate in the alkaline degreaser is 20%;

[0106] Form an atomized liquid from the aqueous solution containing lipase (concentration: 0.5 g / L) and contact it with the surface of the aluminum parts that have undergone the first degreasing process for the second degreasing treatment for 3 min;

[0107] Rinse the aluminum parts that have undergone the second degreasing process with pressurized nitrogen to obtain the degreased aluminum parts.

[0108] Comparative Example 1

[0109] This comparative example provides an electrophoretic part spray degreasing process, including:

[0110] Wash the aluminum parts (length × width: 50 cm × 15 cm) with 1 L of water;

[0111] Spray the 20% sodium hydroxide aqueous solution by mass onto the surface of the aluminum parts that have been washed with water and conduct the first degreasing treatment at 60°C for 2 min;

[0112] Form an atomized liquid from the aqueous solution containing lipase (concentration: 0.5 g / L) and contact it with the surface of the aluminum parts that have undergone the first degreasing process for the second degreasing treatment for 3 min;

[0113] Rinse the aluminum parts that have undergone the second degreasing process with pressurized nitrogen to obtain the degreased aluminum parts.

[0114] Comparative Example 2

[0115] This comparative example provides an electrophoretic part spray degreasing process, including:

[0116] Wash the aluminum parts (length × width: 50 cm × 15 cm) with 1 L of water;

[0117] Spray the 40% diethylamine acetate aqueous solution by mass onto the surface of the aluminum parts that have been washed with water and conduct the first degreasing treatment at 60°C for 2 min;

[0118] An aqueous solution containing lipase (at a concentration of 0.5 g / L) is formed into an atomized liquid and brought into contact with the surface of the aluminum parts that have undergone the first degreasing process for 3 minutes of the second degreasing treatment;

[0119] The aluminum parts that have undergone the second degreasing process are rinsed with pressurized nitrogen to obtain degreased aluminum parts.

[0120] Comparative Example 3

[0121] This comparative example provides an electrophoretic part spray degreasing process, including:

[0122] The aluminum parts (length × width is 50 cm × 15 cm) are cleaned with 1 L of water;

[0123] An aqueous solution containing lipase (at a concentration of 0.5 g / L) is formed into an atomized liquid and brought into contact with the surface of the aluminum parts cleaned with water for 3 minutes of the first degreasing treatment;

[0124] The alkaline degreasing agent is sprayed onto the surface of the aluminum parts that have undergone the first degreasing process and the second degreasing treatment is carried out at 60°C for 2 minutes. Among them, the alkaline degreasing agent includes sodium hydroxide, diethylamine acetate and water, and the mass ratio of sodium hydroxide in the alkaline degreasing agent is 20%, and the mass ratio of diethylamine acetate in the alkaline degreasing agent is 40%;

[0125] The aluminum parts that have undergone the second degreasing process are rinsed with pressurized nitrogen to obtain degreased aluminum parts.

[0126] Comparative Example 4

[0127] This comparative example provides an electrophoretic part spray degreasing process, including:

[0128] The aluminum parts (length × width is 50 cm × 15 cm) are cleaned with 1 L of water;

[0129] The alkaline degreasing agent is sprayed onto the surface of the aluminum parts cleaned with water and the first degreasing treatment is carried out at 60°C for 2 minutes. Among them, the alkaline degreasing agent includes sodium hydroxide, diethylamine acetate and water, and the mass ratio of sodium hydroxide in the alkaline degreasing agent is 20%, and the mass ratio of diethylamine acetate in the alkaline degreasing agent is 40%;

[0130] The aluminum parts that have undergone the first degreasing process are rinsed with pressurized nitrogen to obtain degreased aluminum parts.

[0131] Test Part

[0132] 1) Contact Angle Test

[0133] According to the method of DB44 / T 1232-2013, the contact angles of the degreased aluminum parts in Examples 1-9 and Comparative Examples 1-4 were tested using a contact angle meter. The results are shown in Table 1, wherein the smaller the contact angle, the better the grease removal effect, that is, the better the degreasing effect.

[0134] 2) Adhesion test

[0135] The adhesion of the coating is determined according to GB / T 9286-2021 standard. The specific method is as follows:

[0136] Use an NT knife to draw 6×6 lines (25 1mm2 squares) on the surface of the coated aluminum part, and keep the test surface as flat as possible. Stick the tape (tape viscosity is greater than or equal to 5.3N) to the surface of the sample, and press the tape with a rubber to make full contact between the tape and the test surface, and let it stand for 3 minutes. Quickly tear off the tape in a 90-degree direction, visually inspect the test surface, and refer to the ISO standard rating.

[0137] ISO Standard Rating:

[0138] Grade 0: 5B, the edges of the cut are completely smooth, and there is no peeling on the edges of the lattice.

[0139] Level 1: 4B, there is a small piece of peeling at the intersection of the cuts, and the actual damage in the cross-cut area is less than or equal to 5%.

[0140] Level 2: 3B, there is peeling at the edge or intersection of the incision, and the area is 5%-15%.

[0141] Level 3: 2B, there is partial peeling or large-scale peeling along the edge of the incision, or part of the grid is peeled off in one piece, and the peeling area is 15%-35%.

[0142] Grade 4: 1B, the cut edge is larger than peeling or some squares are partially or completely peeled off, with an area of ​​35%-65%.

[0143] Level 5: 0B, there are pieces of paint falling off at the edges and intersections of the lines, and the total falling area is greater than 65%.

[0144] Table 1 Test results of Examples 1-9 and Comparative Examples 1-4

[0145]

[0146]

[0147] According to Table 1, by comparing the test results of Examples 1-9 and Comparative Examples 1-4, it can be seen that the electrophoretic part spray degreasing process provided by the present invention has a good degreasing effect and is helpful to form a coating with good adhesion.

[0148] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A spray degreasing process for electrophoretic parts, characterized in that: include: A first cleaning step, performing a first cleaning treatment on the electrophoretic element to be cleaned, so as to clean off some impurities on the surface of the electrophoretic element; A first degreasing process, spraying an alkaline degreasing agent onto the surface of the electrophoretic element after the first cleaning process to perform a first degreasing process to remove part of the grease; A second degreasing process, forming an atomized liquid containing a biological enzyme into contact with the surface of the electrophoretic element after the first degreasing process to perform a second degreasing process to remove the remaining grease; The second cleaning process is to perform a second cleaning process on the electrophoretic element after the second degreasing process, so as to clean off the remaining impurities on the surface of the electrophoretic element.

2. The electrophoretic part spray degreasing process according to claim 1, characterized in that: In the first degreasing process, the alkaline degreasing agent includes metal hydroxide, alkaline ionic liquid and water.

3. The electrophoretic part spray degreasing process according to claim 2, characterized in that: The mass ratio of the metal hydroxide to the alkaline ionic liquid is (1-3):(2-4).

4. The electrophoretic part spray degreasing process according to claim 2, characterized in that: The metal hydroxide accounts for 20% to 30% by mass of the alkaline degreasing agent; And / or, the mass proportion of the alkaline ionic liquid in the alkaline degreasing agent is 30% to 40%.

5. The electrophoretic part spray degreasing process according to claim 2, characterized in that: The alkaline ionic liquid includes a quaternary ammonium alkaline ionic liquid.

6. The electrophoretic part spray degreasing process according to claim 2, characterized in that: The alkaline degreasing agent comprises an anionic surfactant, wherein the mass proportion of the anionic surfactant in the alkaline degreasing agent is 2% to 5%.

7. The electrophoretic part spray degreasing process according to claim 2, characterized in that: The temperature of the first degreasing treatment is 60°C to 80°C.

8. The electrophoretic part spray degreasing process according to claim 1, characterized in that: In the second degreasing process, the biological enzyme includes at least one of lipase and phospholipase, and the concentration of the biological enzyme in the solution is 0.5 g / L to 1.5 g / L.

9. The electrophoretic part spray degreasing process according to claim 8, characterized in that: The second degreasing process is performed 1-2 minutes before the end of the first degreasing process.

10. The electrophoretic part spray degreasing process according to claim 1, characterized in that: In the first cleaning step, water is used to perform the first cleaning treatment; And / or, in the second cleaning step, the second cleaning treatment is performed using a pressurized inert gas.

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