Butyl Glycol (2-Butoxyethanol, C6H14O2, CAS 111-76-2) is a colorless, transparent liquid with a mild ether-like odor. It belongs to the glycol ether family, specifically classified as an ethylene glycol monobutyl ether. Its molecular structure combines a hydrophilic ethylene glycol moiety and a hydrophobic butyl group, imparting amphiphilic properties that enhance solvent power for both polar and non-polar substances. This dual affinity underpins its effectiveness in dissolving a wide range of resins and coalescing polymers in paints and coatings.
In formulations, Butyl Glycol acts as a coalescing solvent that improves film formation by slowing the evaporation rate of more volatile solvents, enabling paints and coatings to dry into uniform, durable layers without defects like cracking or blistering. Its moderate evaporation rate balances process efficiency with product performance.
Additionally, Butyl Glycol enhances the penetration and dispersion of cleaning formulations by lowering surface tension, enabling better interaction with oils, greases, and particulate contaminants. It is chemically stable under typical production and end-use temperatures but flammable, requiring appropriate handling.
Performance parameters such as solvent polarity, boiling point (~171°C), vapor pressure, and water solubility make Butyl Glycol distinguished from other glycol ethers—offering good solvency with manageable volatility and a favorable environmental and occupational safety profile when used with standard precautions. Its compatibility with a broad range of resins, pigments, and additives makes it a mainstay solvent within the paints & coatings category, and its liquid form allows straightforward metering and blending in industrial setups.