Polyether defoamer GP-330 (glycerol polypropylene ether, CAS No.: 68439-50-9) is a non-ionic defoamer with excellent performance. However, in practical applications, due to differences in formulation systems, process conditions, addition methods, etc., problems such as unsatisfactory defoaming effect, coating film defects, or system turbidity may still occur. In such cases, immediately stop adding, retain on-site samples and batch records for subsequent analysis.
Initial troubleshooting can start from the following aspects: First, confirm whether the dosage is within a reasonable range (usually recommended at 0.1% to 0.5% of the total system weight; the optimal dosage should be determined through gradient tests based on actual working conditions); second, check whether the addition timing is correct (generally recommended to add during the grinding or dispersion stage to ensure full dispersion); third, confirm whether the system pH is within the tolerance range of GP-330 (performance is stable under pH 5~8 conditions). If the problem remains unresolved after these adjustments, it is recommended to take a small sample for laboratory simulation, comparing the effects of different dosages and addition sequences to pinpoint the cause.
| Common Problem | Possible Cause | Recommended Action |
|---|---|---|
| Slow defoaming speed, short foam suppression time | Insufficient dosage, improper addition method, interference from surfactant types in the system | Gradually increase dosage and perform gradient tests; add before foam generation or during the grinding stage; confirm compatibility with other additives |
| Shrinkage holes or fisheyes on the coating | Excessive dosage, insufficient dispersion, poor compatibility with system resin | Reduce dosage; extend mixing time until fully dispersed; test the effect of different dosages on coating appearance with small samples |
| Product stratification or turbidity | Improper storage temperature (freezing or high temperature), reaction with other components in the system | Check if storage temperature is within 5°C~35°C; confirm no mixing with strong acids or strong oxidizing agents; test stability of small sample mixed individually with each component |
| Decreased defoaming performance under high-temperature conditions | System temperature exceeds the effective working range of GP-330 | GP-330 has excellent temperature resistance, but extreme high temperatures still need to be confirmed by experiments; consider increasing dosage or compounding with other high-temperature resistant defoamers |
No direct contact information is available in the database. It is recommended to first check the Safety Data Sheet (SDS) and product label, which usually contain the manufacturer's contact information. You can also contact Haian Guoli Chemical Co., Ltd. through the following general channels: