Precautions and advantages of defoamers in the application of water-based coatings
As an environmentally friendly and efficient type of coating, water-based coatings have been widely
used in modern industrial production and daily life. However, in the production and
construction process of water-based coatings, foam problems often plague coating manufacturers and
constructors. In order to solve this problem, defoamers came into being.
1. Precautions for defoamers in the application of water-based coatings
Choose the right type of defoamer:
There are many types of defoamers, including silicon-containing, non-silicon-containing, high-temperature resistant,
alkali-resistant, acid-resistant, etc. When choosing, it is necessary to make
a comprehensive consideration based on the characteristics of water-based coatings, construction conditions and the
required defoaming effect.
For example, in a high-temperature baking environment, a high-temperature resistant defoamer should be selected to
avoid the demulsification of the defoamer and the decrease in the
defoaming effect.
Control the amount of defoamer added:
If the amount of defoamer added is too little, the ideal defoaming effect may not be achieved; if the amount added is too
much, it may react with the coating additives, affect the coating
performance, and even cause environmental pollution.
Therefore, it is recommended to adopt the principle of adding small amounts and multiple times, and gradually adjust to
the optimal amount of addition.
Pay attention to the dilution and stirring of the defoamer:
If the defoamer needs to be diluted, soft water with less impurities and suitable temperature should be used, and hard water
or high temperature water should be avoided.
When diluting, a small amount should be added and stirred thoroughly to ensure that the defoamer is evenly dispersed in the paint.
The diluted defoamer should be used up in time to avoid contamination by bacteria.
Consider the compatibility and stability of the defoamer:
When selecting a defoamer, its compatibility with water-based paint should be considered to avoid stratification, precipitation
and other phenomena.
At the same time, the defoamer should have good stability and be able to maintain a stable defoaming effect under various
construction conditions.
2. Advantages of defoamers in the application of water-based paints
Improve the quality of paint:
Defoamers can effectively reduce or eliminate bubbles and foams generated on the surface of the paint, making the paint coating
smoother and more uniform, thereby improving the quality
and appearance of the paint.
By reducing the surface tension of the paint, the defoamer can also make the paint easier to apply and disperse, reducing unevenness
and defects during the paint construction process.
Improve construction performance: Defoamers can reduce the viscosity and surface tension of paint, making the paint easier to apply
and handle. This helps reduce the difference in fluidity
of the paint during construction, reduces resistance when brushing or spraying, and improves the smoothness and efficiency of construction.
Enhance coating performance: Defoamers can
improve the physical and chemical properties of paint by effectively controlling the generation of bubbles and foam. For example, reduce the
water absorption and permeability of the paint,
and improve its weather resistance, durability and corrosion resistance. The use of defoamers can also reduce the drying time and curing time
of the paint, increase the coating speed and
industrial production efficiency of the paint. Save costs: The use of defoamers can reduce waste and rework during the construction of the paint,
thereby reducing the cost of paint production
and construction. At the same time, defoamers can also reduce paint defects and quality problems caused by bubbles and foam, and reduce the
risks and losses in paint production and
construction.
3. Conclusion
In summary, defoamers have significant precautions and advantages in the application of water-based paints. By choosing the right defoamer type,
controlling the
amount added, paying attention to dilution and stirring, and considering compatibility and stability, the advantages of defoamers in improving coating
quality, improving construction
performance, enhancing coating performance, and saving costs can be fully utilized. With the continuous development of the coatings industry, the
application prospects of defoamers will be
broader.
