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Putty powder is a commonly used building decoration material, mainly composed of gypsum, talcum powder, white cement and other ingredients. It usually exists in powder form and needs to be stirred with water to make putty slurry when used. Putty powder has good filling and bonding properties and can provide a smooth base for the wall.

Bubbles sometimes appear in putty powder during use. The reasons are:

1. Uneven stirring: If the putty powder is not mixed with water sufficiently, air can easily enter and produce bubbles.

2. Add too much water: If too much water is added, the viscosity of the putty powder is too low and it is very easy to foam.

3. High moisture content of the base surface: There is more water vapor on the base surface, which may cause poor combination of putty powder and water and produce bubbles.

4. Temperature difference change: Both high and low temperatures will have an adverse effect on the drying process of putty powder, resulting in bubbles.

Putty powder defoamer is a chemical additive mainly used for putty powder, which can reduce or eliminate bubbles. Its advantages are:

1. Improve construction quality: Defoamers can effectively reduce the generation of bubbles, making the putty powder smoother and brighter after brushing.

2. Enhance adhesion: After eliminating bubbles, putty powder can better adhere to the base surface to avoid peeling.

3. Accelerate drying speed: Defoamers can shorten the drying time of putty powder and improve construction efficiency.

4. Improve durability: Reducing bubbles can enhance the strength and durability of the putty layer.

In short, defoamers play a vital role in the use of putty powder and help ensure the quality stability of the final effect.