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With the continuous improvement of green environmental protection regulations, automotive coatings are showing development trends such as high solid differentiation, water-based and powdered.
Water-based coatings are often used in the development process of automobile and parts painting.
What issues should be paid attention to for cathodic electrophoretic coatings and water-based primer coatings?
Three advantages of water- based paint spraying The three major advantages of water-based paint spraying
are the low cleaning cost.
Sprays using solvent-based coatings must be cleaned with organic solvents, and the cleaning agent is disposable and cannot be recycled after use.
The use of water-based paint spray* can achieve the entire cleaning process as long as the usual water is used, and 90% of the cleaning water can be recycled, which not only saves the cost of purchasing cleaning agents, but also reasonably reduces the emission of organic compounds.
The second is the low content of organic solvents.
The content of organic solvent in water-based paint is about 10%, while the content of organic solvent in solvent-based paint is as high as 80% or more.
Therefore, the evaporation of organic compounds in solvent-based paints during the spraying process is much higher than that in water-based paints.
In the spraying process, the use of solvent-based coatings will cause greater pollution.
The third is environmental protection and health to the human body.
Less organic compound emissions in water-based coatings can greatly reduce the potential health hazards of spray paint workers.
The fourth is to comply with the environmental protection regulations of various countries.
The content of organic compounds in water-based coatings complies with the relevant laws and regulations of various countries, which can avoid disputes that companies or individuals may face.
Two categories of water-based coatings and precautions: Two categories of water-based coatings and precautions:
1.
Cathodic electrophoresis
Cathodic electrophoretic coatings have been widely used in automobile body primers for a century.
And the application range is extremely wide.
Most of the car bodies use CED coating for primer.
This kind of technology can not only meet the various performance requirements of customers, but also achieve the meaning of saving resources and environmental protection.
With the improvement of research and development capabilities At present, there are mainly two kinds of coatings, weather-resistant (V-resistant) CED coatings and ultra-high penetration coatings. Weather resistance (UV resistance) CED coating.
In order to ensure the corrosion resistance of CED coatings, epoxy resins are usually used, but epoxy resins are very susceptible to ultraviolet light, will age under long-term light, and have poor weather resistance.
Therefore, new processes must be developed to adapt to The essentials of automobile painting technology.
Weather-resistant CED coatings are divided into two types, one is a layer-separated high weather-resistant CED coating, and the other is an acrylic resin CED coating.
The former uses different solubility and two low-compatibility resins combined with electrophoretic coating.
Later, the corrosion resistance and weather resistance coexist in one process.
Such a layer separation structure makes the upper layer have weather resistance and better chipping resistance.
The biggest advantage of this method is that it can be used for In the coating system of the middle coat.
2.
The
use of water -based primer can greatly reduce VOC emissions .
Water-based primer also has the advantages of solvent- based primer .
It can not only hide the unevenness of the bottom surface, but also has light resistance and chipping resistance.
During the coating process It is necessary to make the film thickness reach 25 micrometers to 30 micrometers.
Due to the large surface tension of water-based paint, surface regulators can be used in the formulation design to reduce the surface tension and make it easy to wet the substrate.
In addition, The stability of the water-based intermediate coating line is also very important, not only to ensure a reasonable temperature, but also to ensure the standardization of the drying operation, so that the moisture can be fully volatilized.
In fact, good water-based paints can contribute to environmental protection.
Therefore, in addition to the introduction of water-based car refinish paints suitable for various car models by major imported automotive paint manufacturers, major domestic manufacturers have also developed their own water-based paint brands.
.
Forward-looking automobile brands and refinishing spray plants have also begun to switch to water-based paint.
Water-based coatings are often used in the development process of automobile and parts painting.
What issues should be paid attention to for cathodic electrophoretic coatings and water-based primer coatings?
Three advantages of water- based paint spraying The three major advantages of water-based paint spraying
are the low cleaning cost.
Sprays using solvent-based coatings must be cleaned with organic solvents, and the cleaning agent is disposable and cannot be recycled after use.
The use of water-based paint spray* can achieve the entire cleaning process as long as the usual water is used, and 90% of the cleaning water can be recycled, which not only saves the cost of purchasing cleaning agents, but also reasonably reduces the emission of organic compounds.
The second is the low content of organic solvents.
The content of organic solvent in water-based paint is about 10%, while the content of organic solvent in solvent-based paint is as high as 80% or more.
Therefore, the evaporation of organic compounds in solvent-based paints during the spraying process is much higher than that in water-based paints.
In the spraying process, the use of solvent-based coatings will cause greater pollution.
The third is environmental protection and health to the human body.
Less organic compound emissions in water-based coatings can greatly reduce the potential health hazards of spray paint workers.
The fourth is to comply with the environmental protection regulations of various countries.
The content of organic compounds in water-based coatings complies with the relevant laws and regulations of various countries, which can avoid disputes that companies or individuals may face.
Two categories of water-based coatings and precautions: Two categories of water-based coatings and precautions:
1.
Cathodic electrophoresis
Cathodic electrophoretic coatings have been widely used in automobile body primers for a century.
And the application range is extremely wide.
Most of the car bodies use CED coating for primer.
This kind of technology can not only meet the various performance requirements of customers, but also achieve the meaning of saving resources and environmental protection.
With the improvement of research and development capabilities At present, there are mainly two kinds of coatings, weather-resistant (V-resistant) CED coatings and ultra-high penetration coatings. Weather resistance (UV resistance) CED coating.
In order to ensure the corrosion resistance of CED coatings, epoxy resins are usually used, but epoxy resins are very susceptible to ultraviolet light, will age under long-term light, and have poor weather resistance.
Therefore, new processes must be developed to adapt to The essentials of automobile painting technology.
Weather-resistant CED coatings are divided into two types, one is a layer-separated high weather-resistant CED coating, and the other is an acrylic resin CED coating.
The former uses different solubility and two low-compatibility resins combined with electrophoretic coating.
Later, the corrosion resistance and weather resistance coexist in one process.
Such a layer separation structure makes the upper layer have weather resistance and better chipping resistance.
The biggest advantage of this method is that it can be used for In the coating system of the middle coat.
2.
The
use of water -based primer can greatly reduce VOC emissions .
Water-based primer also has the advantages of solvent- based primer .
It can not only hide the unevenness of the bottom surface, but also has light resistance and chipping resistance.
During the coating process It is necessary to make the film thickness reach 25 micrometers to 30 micrometers.
Due to the large surface tension of water-based paint, surface regulators can be used in the formulation design to reduce the surface tension and make it easy to wet the substrate.
In addition, The stability of the water-based intermediate coating line is also very important, not only to ensure a reasonable temperature, but also to ensure the standardization of the drying operation, so that the moisture can be fully volatilized.
In fact, good water-based paints can contribute to environmental protection.
Therefore, in addition to the introduction of water-based car refinish paints suitable for various car models by major imported automotive paint manufacturers, major domestic manufacturers have also developed their own water-based paint brands.
.
Forward-looking automobile brands and refinishing spray plants have also begun to switch to water-based paint.
