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A defoamer manufacturer explains: How should the defoaming performance of a defoamer be tested?
Release Date:
2022-02-24
Defoamers are substances with low surface tension and high surface activity that can inhibit or eliminate foam in a system. During industrial production, large amounts of undesirable foam often arise, significantly impeding process efficiency; in such cases, defoamers must be added to remove this harmful foam.
A defoamer is a substance with low surface tension and high surface activity that can inhibit or eliminate foam in a system. During industrial production, large amounts of undesirable foam often form, significantly impeding process efficiency; in such cases, a defoamer must be added to remove this harmful foam.
Defoamers are primarily suitable for applications in printed circuit board (PCB) processes, the chemical industry, electroplating, textile dyeing and printing, papermaking, pharmaceuticals, water-based inks, ceramic slitting, steel‑plate cleaning, aluminum processing, various wastewater‑treatment systems, and other industrial aqueous systems, where they effectively eliminate and inhibit foam.
Different types of defoamers exhibit varying defoaming performance. Today, a leading defoamer manufacturer will introduce three methods for evaluating the defoaming efficacy of defoamers:
1. Law of Reincarnation
The drop height and flow rate of the circulating material remain constant, and the material level in the receiver is recorded at each time interval. When the air entrainment rate is low, the defoaming performance is considered to be good.
2. Vibration Method
The coating used is an acrylic latex paint, and no defoamer was added prior to testing. The test sample was filled to half the volume of the test vessel, and after shaking for the specified duration, the density of the defoamer was determined. Unlike other methods, this approach is suitable for low-viscosity coatings or emulsions.
3. Bubble Method
This method involves directly introducing air to generate foam in the system. A 100 mL sample is placed in a graduated cylinder with a diameter of 5 cm; after adding an antifoaming agent, a peristaltic pump delivers 500 mL of air per minute, with the temperature maintained at 30°C. The foam height is recorded at fixed intervals. In industrial applications, when using roller or curtain coating, any excess coating that drips off after application collects in a receiver for recirculation and reuse. The duration of vibration can be adjusted according to the ease with which foam forms.
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