Overview
Polyether defoaming powder is a high-performance antifoam agent formulated for industrial systems where liquid defoamers are impractical. Developed as a dry alternative to silicone-based products, it combines modified polyethers with carrier powders for controlled release. The technology emerged in the 1990s to address foam issues in high-temperature processes and alkaline environments. Unlike conventional defoamers, the powder form allows precise dosing in dry-mix applications and reduces transportation costs. Major producers include specialty chemical companies in Germany, China, and the US, with formulations tailored for specific industries like textile printing or fermentation processes.
Physical and Chemical Properties
The powder exhibits a bulk density lower than water, ensuring it floats on foam surfaces when applied. Particle size typically ranges from 50-200 microns for optimal dispersion. Its polyether components have cloud points between 40-80°C, providing temperature-activated defoaming. Chemically inert, it doesn't react with most processing aids or affect product color. The formulation maintains stability across a broad pH range (3-12), making it suitable for acidic paper pulping or alkaline textile scouring. Laboratory tests show >90% foam collapse within 30 seconds at recommended dosages of 0.1-0.5% by weight.
Main Applications
In wastewater treatment plants, the powder controls foam in aeration tanks without harming microbial activity. Paper mills use it in pulp washing stages to prevent foam-induced pump cavitation. The textile industry applies it during jet dyeing where conventional defoamers might stain fabrics. Emerging applications include concrete admixtures (reducing air entrainment) and fermentation processes in pharmaceutical production. Some food-grade variants meet FDA 21 CFR 173.340 standards for incidental contact, though most industrial grades aren't suitable for direct food applications.
Safety and Storage
As a combustible dust, storage requires Class II explosion-proof electrical installations. Facilities should implement grounding during bulk transfer to prevent static discharge. The powder has low oral toxicity (LD50 >5000 mg/kg) but may cause respiratory irritation. Recommended storage maintains relative humidity below 65% to prevent caking. Bulk bags should be stacked no more than three layers high to avoid compression. Shelf life is typically 12-18 months in original packaging, with potency tests recommended after prolonged storage.
B2B Procurement Guide
Industrial buyers should specify: 1) Required foam collapse speed (ASTM D892 testing), 2) Maximum process temperature tolerance, and 3) Compatibility with other additives like wetting agents. Sample testing under actual production conditions is strongly advised. Leading manufacturers include BASF (Foamaster® PD series), Evonik (TEGO® Foamex), and domestic Chinese producers like Jiangsu Four New. Bulk shipments (500kg+ bags) typically offer 8-15% cost savings versus 25kg bags. Some suppliers provide just-in-time delivery programs for high-volume users.
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