In coating production or application, adding defoamers is a common method to eliminate bubbles, but improper use may lead to cratering defects. Chemi Tech, a specialized brand in defoamer technology, offers the following solutions:
Cratering often results from poor compatibility between defoamer and coating. Use Chemi Tech’s high-compatibility series (e.g., KM-200) and adjust dosage (typically 0.1%-0.5%) via small-scale tests to avoid excessive surface tension disruption.
High-speed dispersion (800-1200 rpm) can entrap air. Maintain temperature at 25-35°C and add Chemi Tech defoamers slowly during the mixing phase to prevent localized over-concentration.
Residual oils or mold release agents worsen cratering.
Frequent cratering may indicate resin-additive mismatch.
High humidity (>80%) or temperature fluctuations can cause defoamer migration. Apply coatings in controlled environments (20-25°C, 50-70% RH) with spray pressure at 0.3-0.5 MPa for optimal atomization.
These measures effectively address cratering caused by Chemi Tech defoamer misuse. For further assistance, contact the technical team for customized diagnostics.
Guangzhou Chemi Tech New Material Co., Ltd.
Address : No. 3 Road, Lanshan Village, Xiancun Town, Zengcheng District, Guangzhou City
Contact : +86-19820415595(Manager Fang)
Tel : +86-13414362583(Manager Lee)
E-mail : crystal@gzchemitech.com