Features Of BYK-1640 Defoamer
Formulated for Specific Systems: Tailored to perform effectively in solvent-based systems and pigment concentrates, ensuring strong compatibility with these formulations.
Steric Hindrance Mechanism: Utilizes steric hindrance to break down pigment flocculates, preventing agglomeration and promoting uniform dispersion of pigments.
Enhances Critical Properties: Improves gloss for a more polished finish, boosts color strength for vibrant and consistent hues, and enhances flowability for smoother processing and application.
Typical Applications Of BYK-1640 Defoamer
Baking Paints: Used in baking paint applications to eliminate boiling defects and control foam, ensuring a high-quality, smooth finish after curing.
Industrial Coatings: Ideal for a range of industrial coatings, enhancing their surface integrity, performance, and aesthetic appeal for consistent, reliable results across diverse applications.
Specifications Of BYK-1640 Defoamer
Chemical Composition | High - molecular - weight block copolymer solution with pigment - affinic groups |
Solvent | Xylene / butyl acetate / propylene glycol methyl ether acetate (specific ratio not given) |
Non - Volatiles | Around 45% |
Amine Value | 10mg KOH / g |
Storage and transportation | Must be stored and transported at temperatures below 40 °C |
BYK-1640 Defoamer – Frequently Asked Questions (FAQ)
Q1: What types of coating systems is BYK-1640 Defoamer designed for?
A: BYK-1640 is specially formulated for waterborne architectural and industrial coatings, including interior and exterior paints, primers, and clear coats. It is particularly effective in low-shear, high-pigment-load formulations where foam control during production and application is critical.
Q2: How does BYK-1640 differ from silicone-based defoamers?
A: Unlike many silicone-based defoamers, BYK-1640 is a non-silicone, mineral oil–based system. This minimizes the risk of substrate wetting issues, surface defects such as craters or pinholes, and compatibility problems in sensitive formulations—making it especially suitable for high-gloss and demanding decorative coatings.
Q3: Can BYK-1640 be added at any stage of the manufacturing process?
A: Yes, BYK-1640 offers excellent incorporation flexibility. It can be added during pigment grinding (for early foam suppression), let-down, or even post-addition—without significantly affecting viscosity or stability. Its robust performance across pH ranges and shear conditions supports versatile dosing strategies.
Q4: Is BYK-1640 compatible with common thickeners and rheology modifiers?
A: BYK-1640 demonstrates good compatibility with associative and non-associative thickeners—including HEC, HASE, and ASE types—as well as common cellulose derivatives. It generally does not interfere with thickener efficiency or induce phase separation when used within recommended dosage ranges.
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