Methyl Isobutyl Ketone (MIBK), also known as 2-methyl-3-butanone, is a colorless organic solvent with a pleasant odor. It belongs to the ketone class of chemicals and has the chemical formula C₆H₁₂O. MIBK is widely used in industrial applications due to its strong solvency power, versatility, and relatively low toxicity compared to other solvents. MIBK is known for its ability to dissolve a wide variety of resins, oils, waxes, and other organic materials, making it an important solvent in industries ranging from coatings and adhesives to chemical processing and extraction.
Properties:
- Molecular Formula: C₆H₁₂O
- IUPAC Name: 2-Methyl-3-butanone
- Boiling Point: 116°C (240.8°F)
- Melting Point: -85°C (-121°F)
- Density: 0.802 g/cm³ at 20°C
- Flash Point: -5°C (23°F) – highly flammable
- Solubility: Slightly soluble in water, but very soluble in organic solvents like alcohol, ether, acetone, and chloroform.
Key Uses of MIBK:
Solvent in Paints and Coatings:
MIBK is used in paints, coatings, and lacquers as a solvent for resins and pigments, especially for high-performance coatings in industries like automotive and aerospace.
Adhesives:
It is a common solvent in adhesive formulations, particularly for contact cements and rubber-based adhesives.
Extractive Solvent:
MIBK is used as an extractive solvent in industrial extraction processes, such as the separation of aromatic hydrocarbons from aliphatic hydrocarbons in petroleum refining.
Solvent in Rubber and Plastics:
MIBK is often used in the rubber industry for dissolving and processing various synthetic rubbers. It is also employed in the production of plasticizers.
Chemical Intermediate:
Used in the synthesis of chemicals like isopropyl alcohol, methyl isobutyl ketone peroxides, and other specialty chemicals.
Printing Inks:
MIBK is used in printing inks to improve flow and prevent clogging in inkjet and offset printing.
Cleaning and Degreasing:
Like MEK, MIBK is effective for cleaning and degreasing industrial equipment and surfaces.