Application Configuration of ATAGO Solid Refractometer in Electrophoretic Coating Process
Electrophoretic coating (electro-coating) applied electric field is the use of the suspension in the electrophoretic pigment particles and the liquid resin or the like and directional migration deposition method for coating the substrate surface of one of the electrodes. Principle electrophoretic coating of the invention so the late 1930s, but the development of this technology and industrial application is after 1963, electrophoretic coating is a method of forming a special coating developed in the past 30 years, and is water-based paint The most practical construction process. It has the characteristics of water-soluble, non-toxic, easy-to-automate control, etc. It has been widely used in automobiles, building materials, hardware, home appliances and other industries.
Keywords: electrophoretic coating electrophoretic paint concentration electrophoresis bath concentration electrophoretic concentration
Electrophoretic coating process conditions include the following four aspects of 13 conditions (parameters):
1 ) The composition of the bath: solids, ash, MEQ and organic solvent content;
2 ) Electrophoresis conditions: bath temperature, bathing voltage, swimming time;
3 ) bath characteristics: PH value, conductivity;
4 ) Electrophoretic properties: curing efficiency, maximum current value, film thickness, and throwing power.
Among them, bathing voltage and time, bath solids, temperature, pH and conductivity are the main items of on-site control and management .
1] Solids (soluble solids content)
Increasing the solid content can increase the viscosity of the electrophoretic fluid, reduce the speed of particle migration, increase the amount of deposition, and increase the electrophoretic efficiency. However, the solid content must not be too high, otherwise the coating is rough and orange peels and other defects are easily generated. When the solids content is too low, the coulomb efficiency of the electrodeposition is low, the resistance of the paint film increases, the voltage increases, the electrolysis reaction of the water increases, the throwing power is low, the film layer is thin, and the change of the paint liquid is large, especially in mass production. Control, prone to pinholes, flower spots, loss of light and other phenomena. During the production process, the solids content keeps declining and should be frequently supplemented to keep it within the specified range.
It is generally characterized using a refractometer to measure the Brix content.
2] pH value
If the pH value is too low, the pulse current density in the electrophoresis tank will decrease, which will cause the template to be partially lacquer-free, which will lead to the formation of a flower face. If the pH value is too high, the wet film will be re-dissolved and the film will be converted into a book, which will affect the coating quality.
3] Conductivity 　
The conductivity of the paint is too low, and the paint film is not easy to form; the conductance is too high, causing the paint film to have a rough appearance. For the same coating, the most important factor in the conductance of the paint is the presence of impurity ions in the paint. Therefore, it is necessary to maintain the normal value of conductivity by controlling the impurity content.
As a leading manufacturer of global refractometers, ATAGO has for 75 years now. With its excellent price/performance ratio, ATAGO is widely used in beverages and other food products, natural product extraction and other pharmaceutical, mechanical processing, and chemical industries. Following a brief Refractometer ATAGO PAL-1 digital refractometer solid, MASTER- α type solid concentration meter scale, DPH-2 digital PH meter, DEC-2 digital conductivity meter and other equipment in the electrophoretic coating process Application solution.
Project, parameters
Solid component - refractometer ( scale and digital display )
pH - digital pH meter
Conductivity - Digital conductivity meter
model
Master-a
Pal-1
DPH-2
DEC-2
Range
0-33%
0-53%
0-14pH
0-19.90ms/cm
Resolution
±0.2%
±0.1%
0.1pH
0.10ms/cm
Accuracy
±0.2%
±0.2%
±0.1pH (2.0-12.0pH)
±0.2ms/cm (0-10.0ms/cm)
±0.4ms/cm (10-19.90ms/cm)
Automatic temperature compensation
10-30 °C
10-100 °C
0-50 °C
0-50 °C
Protection level
IP 65
IP 65
IP67
IP67
weight
155g
100g
90g
90g
To enable simultaneous measurement of various types of aqueous concentrations (dilution) by Brix value, ATAGO (Atago) refractometer concentration value can be displayed directly on the screen. There are more than 80 special scales to choose from.
Please refer to the product application plan for details:
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