How to solve the problem of foaming in water-based coatings

Bubbling in water-based coatings not only affects aesthetics, but may also reduce the protective performance of the coating. To completely solve the problem, it is necessary to first identify the cause and then prescribe the right medicine. This article will systematically analyze the root cause of blistering and provide practical solutions to help you achieve a smooth and flawless paint film effect.

1）Which of the three major causes of foaming did you fall for?

1. "Stirring too vigorously" - Bubble traps in the production process

• When dispersing at high speed, air is drawn in to form stable foam
• Excessive surfactant stabilizes foam like "soapy water"
• Improper addition of thickening agent locks bubbles in the paint

2. "Improper construction" - the most easily overlooked cause of foaming

• The moisture content of the grassroots is high (>10%), and the evaporation of water causes bubbles to rise
• The roller coating speed is too fast, like mixing egg whites with air
• One time thick coating (>200 μ m), the surface dries too quickly and blocks the exhaust passage

3. 'Material rebellion' - potential issues with the formula itself

• Resin contains volatile components, causing bubbles to form when dried
• Choosing the wrong type of defoamer only adds fuel to the fire
• When the ambient temperature exceeds 35 ℃, the rate of water evaporation becomes uncontrollable

2） Anti foaming practical plan:

1. Production process: Suppress bubbles in the cradle

Use a serrated stirring blade with a speed controlled between 800-1200rpm; Using the 'secondary addition method':

① Add 0.2% defoamer (such as Kemitech water-based coating defoamer) during the grinding stage

② Add 0.1% defoamer to suppress foaming during the paint mixing stage (such as Kemitech water-based paint special defoamer)

Let it stand for 30 minutes before discharging, or use vacuum defoaming equipment

2. Construction key: Details determine success or failure

Three step method for grassroots treatment: polishing → measuring moisture content (<10%) → applying sealing primer

Golden combination of construction parameters:

• Film thickness control: single pass 80-120 μ m
• Construction temperature: 15-30 ℃
• Humidity range: 40% -70%

3） Selection guide for defoamers: targeted treatment is effective

Conclusion: By mastering these three core strategies and using the correct defoamer, 90% of foaming problems can be easily solved. Suggest collecting this article as a technical manual and comparing and troubleshooting it when encountering problems! Do you need specific product recommendations or construction video guidance? Welcome to inquire: 086-19820415595, Manager Fang.