Methyl Ethyl Ketone (MEK), also known as butanone, is a colorless organic solvent with a sharp, sweet odor. Its chemical formula is C₄H₆O, and it is classified as a ketone. It is highly soluble in water and most organic solvents, making it a versatile solvent in various industrial and commercial applications. MEK is a volatile liquid that evaporates quickly, and it is often used for its excellent solvency power in dissolving a wide range of substances. It is particularly valued for its ability to dissolve resins, lacquers, paints, and plastics.
Properties:
- Molecular Formula: C₄H₆O
- IUPAC Name: Butan-2-one
- Boiling Point: 79.6°C (175.3°F)
- Melting Point: -85.0°C (-121°F)
- Density: 0.805 g/cm³ at 20°C
- Flash Point: -9°C (15.8°F), making it highly flammable
- Solubility: Highly soluble in water, alcohol, ether, and other organic solvents.
Key Uses of MEK:
Solvent in Paints and Coatings:
MEK is commonly used in paints, lacquers, and varnishes due to its strong solvency, ability to dissolve resins, and fast evaporation rate.
Adhesives:
It is widely used in the production of adhesives and glues (especially rubber-based adhesives), enhancing bonding strength and improving drying times.
Cleaning and Degreasing:
MEK is used as a powerful industrial cleaner for removing oils, grease, and resins from surfaces and machinery parts.
Printing Inks:
Used in printing inks, especially in flexographic printing, to dissolve resins and ensure smooth application.
Plastic and Rubber Production:
MEK is involved in the synthesis of polymers, including acrylics and polystyrene, and is used in synthetic rubber production.
Chemical Synthesis:
MEK serves as a solvent in various chemical syntheses, including the production of peroxides, which are used in polymerization reactions.
Nail Polish Removers:
It is a common ingredient in nail polish removers, particularly in acetone-free formulations.