2-Butoxyethanol (Butyl Glycol) CAS 111-76-2

Introduction to 2-Butoxyethanol

2-Butoxyethanol, commonly known as Butyl Glycol, is the most widely consumed glycol ether in industrial formulations. Its molecule combines a polar hydroxyl group with a four-carbon butyl ether chain, creating a unique amphiphilic structure that dissolves in water while simultaneously solubilizing oils, greases, resins and nitrocellulose. Paint manufacturers use it as a coalescing solvent to ensure smooth film formation, while cleaning chemical formulators rely on it to lift stubborn hydrocarbon soils from metal and concrete surfaces.

Its “middle-of-the-road” evaporation rate — comparable to xylene but fully water-miscible — prevents blistering in baking enamels and improves wet-edge time in architectural latex paints. The liquid is hygroscopic and flammable; vapors can form explosive mixtures above 60 °C. Store drums in a well-ventilated, cool warehouse away from direct sunlight and ignition sources, and always bond and ground containers during transfer.

2-Butoxyethanol Chemical & Physical Properties

Applications of 2-Butoxyethanol

Architectural and industrial coatings: Dosed at 2–8% in latex paints, enamels and printing inks. It acts as a coalescing agent that temporarily softens latex particles for film formation, then evaporates slowly to prevent blistering and improve gloss uniformity.

Industrial and institutional cleaning: Blended at 5–30% in alkaline degreasers, floor strippers and oven cleaners. It solubilizes grease and carbonized soils while coupling anionic surfactants and caustic soda into a stable, single-phase liquid.

Oil and gas field chemicals: Added to hydraulic fracturing fluids and drilling muds as a surfactant and shale inhibitor. It prevents clay swelling and improves lubricity in high-pressure downhole environments.

Textile and leather processing: Used as a dye-leveling agent and penetrant at 1–5% in dye baths, ensuring uniform color uptake on synthetic fibers and preventing ring-dyeing.

Storage & Safety Precautions for 2-Butoxyethanol

• Store in tightly sealed, grounded containers in a cool, well-ventilated warehouse below 40 °C. The liquid is hygroscopic and absorbs atmospheric moisture, increasing water content in sensitive formulations. Keep away from strong oxidizers and open flames. Use nitrogen padding for long-term storage if purity must be preserved.
• Harmful if inhaled or absorbed through skin. Causes eye irritation. Wear chemical splash goggles, butyl rubber gloves, and use local exhaust ventilation during transfer. Do not use near open flames or sparks.
• Verify purity by Gas Chromatography and water content by Karl Fischer titration upon receipt. Off-spec water content indicates drum seal failure during transit — evaluate for rejection or re-distillation based on formulation tolerance.

2-Butoxyethanol FAQ

Q: How does 2-Butoxyethanol differ from Propylene Glycol Butyl Ether (DPM)?

A: Both are slow-evaporating glycol ethers, but 2-butoxyethanol (ethylene glycol-based) offers stronger solvency for oils and better coupling in high-pH systems. DPM is less toxic and preferred in consumer products. Use Butyl Glycol for heavy-duty industrial cleaning; use DPM for low-odor, low-toxicity applications.

Q: My Butyl Glycol arrived cloudy. Is it contaminated?

A: Cloudiness usually indicates moisture absorption exceeding 0.5% due to compromised drum seals. Run Karl Fischer testing; if water content exceeds spec, the lot is still usable for water-based cleaners but may cause haze in solvent-only coatings. Reject if used in anhydrous systems.

Q: Can I use 2-Butoxyethanol in food-contact cleaning formulations?

A: Not recommended for direct food contact. It is approved in some regions for indirect food-contact surface cleaners with a mandatory potable water rinse. Always verify local regulations before formulating.