N-Butyl Acrylate CAS 141-32-2: High-Purity Monomer for Coatings and Adhesives

N-Butyl acrylate, with the chemical formula C₇H₁₂O₂ and CAS number 141-32-2, is a versatile alkyl ester of acrylic acid widely utilized as a reactive monomer in the synthesis of acrylic polymers and copolymers. This clear, colorless liquid with a characteristic fruity odor polymerizes readily through free radical initiation, forming flexible, low-glass-transition-temperature materials ideal for soft-touch applications. Our stabilized N-butyl acrylate, containing hydroquinone inhibitors, provides superior storage stability and process reliability, meeting industry specifications for purity and low residual monomer content in paints, adhesives, and elastomers.

Key Properties

Property Value/Description
CAS Number 141-32-2
Molecular Formula C₇H₁₂O₂
Molecular Weight 128.17 g/mol
Appearance Clear, colorless liquid
Boiling Point 145-148°C
Melting Point -64°C
Density 0.90 g/cm³ at 20°C
Flash Point 49°C (closed cup)
Purity ≥99% (GC)
Solubility Slightly soluble in water; miscible with organic solvents like ethanol and acetone

These properties highlight N-butyl acrylate’s compatibility with emulsion and solution polymerization systems for tunable film flexibility and adhesion.

Applications and Uses

It’s ester group enables copolymerization with styrene, vinyl acetate, and other acrylates, yielding products with enhanced elasticity and weather resistance. Principal uses include:

  • Paints and Coatings: Provides flexibility and durability in architectural latex paints, automotive topcoats, and industrial enamels for superior film formation.
  • Adhesives and Sealants: Contributes to tack and peel strength in pressure-sensitive tapes, hot-melt glues, and construction sealants.
  • Textiles and Nonwovens: Improves hand feel and water repellency in fabric backcoatings and hygiene product binders.
  • Paper and Leather Finishing: Enhances printability and abrasion resistance in coated papers and leather treatments.
  • Elastomers and Foams: Serves as a soft segment in synthetic rubbers and flexible foams for automotive and consumer goods.

Employing N-butyl acrylate supports high-throughput manufacturing with reduced volatile emissions and improved end-product performance.

Safety and Handling Guidelines

N-Butyl acrylate is flammable and a potential skin and respiratory sensitizer, causing irritation or allergic reactions upon prolonged exposure. Process in explosion-proof equipment with PPE including chemical-resistant gloves, goggles, and respirators in well-ventilated facilities. It may polymerize exothermically if uninhibited, so maintain temperatures below 35°C during storage in vented drums under nitrogen. Neutralize spills with absorbent materials and ventilate areas. Consult the Material Safety Data Sheet (MSDS) for exposure limits (e.g., TLV 2 ppm) and emergency response, ensuring compliance with flammable liquid transport standards like UN 1992.

Frequently Asked Questions (FAQs)

What is the main function of N-Butyl Acrylate CAS 141-32-2?

It functions primarily as a comonomer in acrylic latexes and resins, imparting flexibility and hydrophobicity to coatings, adhesives, and textiles through radical polymerization.

How can N-Butyl Acrylate be stored to prevent polymerization?

Store in cool, dark conditions at 5-25°C in inhibitor-preserved, airtight containers away from peroxides and metals, with a typical shelf life of 6-12 months under inert gas.

What purity levels does this product offer?

Available at ≥99% purity by gas chromatography, with low water and acid content to minimize side reactions in emulsion or bulk polymerization setups.

What are the shipping classifications for N-Butyl Acrylate?

Classified as UN 1992, Packing Group III (flammable liquid), suitable for shipment in 190 kg steel drums, 1,000 kg IBCs, or isotanks with proper stabilization and labeling.

Is N-Butyl Acrylate suitable for water-based systems?

Yes, it excels in aqueous emulsions for low-VOC paints and binders, offering good stability and film coalescence without coalescing aids.

What environmental precautions apply to N-Butyl Acrylate?

It biodegrades aerobically but is toxic to aquatic organisms; use containment for spills and treat effluents via biological processes to comply with discharge limits.

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