Side Effects of Incorrect Use of Chemi Tech Defoamers and Solutions

Defoamers are essential additives in coating production, effectively eliminating bubbles and improving film quality. However, incorrect usage (e.g., overdosing or poor mixing) defoamers may lead to adverse effects. Key issues and solutions include:  

1. Craters & Fisheyes  

Excessive defoamer disrupts surface tension, causing localized depressions (craters) or circular defects (fisheyes). Adhere to Chemi Tech’s recommended dosage (typically 0.1%-0.5%) and ensure thorough stirring.  

2. Compatibility Issues  

Poor compatibility may cause oil separation or stratification. Select specialized Chemi Tech products (e.g., KM-2200 for water-based coatings) and conduct pre-testing.  

3. Reduced Gloss 

Residual defoamer can cause haze. Optimize curing temperature or switch to low-impact variants like KM-2500.  

4. Storage Instability 

Improper addition may shorten shelf life. Add defoamers in stages and avoid high-temperature storage.  

Expert Recommendations: 

- Follow Chemi Tech’s technical guidelines strictly.  

- Choose defoamer models tailored to specific systems (water/solvent-based).  

- Perform compatibility and efficacy tests before full-scale production.  

By applying Chemi Tech defoamers scientifically, coating manufacturers can enhance yield and reduce rework costs significantly.