Bubbling Issues in Chemi Tech Coatings Due to Excessive Inorganic Powder: Causes & Solutions

In coating production and application, the dosage of inorganic powders critically impacts performance. Recent feedback indicates that excessive inorganic powder in Chemi Tech coatings may cause bubbling. This article provides a systematic analysis and solutions to help users avoid such issues.  

Root Cause Analysis  

1. High Oil Absorption: Overloading inorganic powders (e.g., calcium carbonate, talc) increases oil absorption, leading to abnormal viscosity and trapped solvents.  

2. Dispersion Instability: Exceeding Critical Pigment Volume Concentration (CPVC) causes incomplete resin coverage, forming microvoids during curing.  

3. Reactive Bubbling: Hydrated powders (e.g., gypsum) release steam under high temperatures.  

Chemi Tech's Professional Solutions  

1. Formulation Optimization  

- Maintain powder content at 20%-35% (adjust per resin type).  

- Use Chemi Teche's modified KM-200 series powders with 30% lower oil absorption.  

2. Process Improvements  

- Adopt step-wise mixing: low-speed dispersion (400rpm/10min) followed by medium-speed blending (800rpm/15min).  

- Add 0.1%-0.3% Chemi Tech defoamer KM-688 for rapid microbubble elimination.  

3. Application Guidelines  

- Substrate moisture content <8%, ambient humidity below 60%.  

- For airless spraying, pressure should not exceed 2500psi.  

Preventive Testing  

Chemi Tech Lab offers free powder compatibility testing. Submit samples via official website for customized formulation reports.

Through scientific formulation and process control, bubbling issues can be effectively prevented.For more information, please consult Chemi Tech Technology: 86+198-2041-5595.