Butylated Urea Formaldehyde Resin
Butylated Urea-Formaldehyde Resin(BUF) is a modified product of urea-formaldehyde resin (synthesized by the polycondensation of urea and formaldehyde) throughbutanol etherification. By reacting butanol with the hydroxymethyl groups (-CH2OH) in urea-formaldehyde resin, butoxy-substituted derivatives are formed, enhancing its properties:
- Solubility: Improved solubility in organic solvents (e.g., xylene, alcohols), making it suitable for solvent-based coating systems.
- Stability: Reduced tendency for hydroxymethyl self-condensation, enhancing storage stability.
- Flexibility: Lower brittleness, improving impact resistance of coatings or adhesive layers.
- Compatibility: Better miscibility with other resins (e.g., alkyd resins, epoxy resins).
Key Applications
- Coatings Industry
- Cross-linking Agent: As a type of amino resin, it is combined with alkyd resins, acrylic resins, etc., in high-temperature curing coatings (e.g., automotive topcoats, coil coatings, industrial baking paints) to provide high gloss, hardness, and chemical resistance.
- Wood Coatings: Used in furniture and floor paints to enhance surface wear and scratch resistance.
- Adhesives
- Wood Bonding: Applied in particleboard and plywood production, offering improved water resistance compared to conventional urea-formaldehyde resins.
- Laminated Materials: Provides strong adhesion in composites with paper or fabrics.
- Composite Materials
- Molding Compounds: Serves as a matrix resin for electrical components and automotive parts, enhancing heat resistance and dimensional stability.
- Other Fields
- Inks: Used as a binder to improve weather resistance and adhesion of printed materials.
- Textile Auxiliaries: Acts as a fabric finishing agent to enhance wrinkle resistance and hand feel.
Advantages and Limitations
- Advantages: Low cost, fast curing, high hardness, and solvent resistance.
- Limitations: May release trace formaldehyde; less environmentally friendly compared to water-based or formaldehyde-free resins (e.g., polyurethane, acrylic).
Fundamental Chemical Properties
Property Specification Chemical Name Butylated Urea Formaldehyde Resin CAS Number [Not specified] Molecular Structure Modified UF resin with butanol etherification Appearance Colorless to pale yellow viscous liquid Solid Content 50-60% Viscosity (25°C) 200-800 mPa·s pH Value 7.5-9.0 Solubility Water-miscible Key Performance Characteristics
Parameter Test Method Typical Value Cure Temperature DSC 100-130°C Gel Time (120°C) ISO 8985 90-180 sec Flexural Strength ASTM D790 80-110 MPa Water Resistance 24h immersion ≤2% weight gain Storage Stability 25°C/6 months ≤10% viscosity change Application Guidelines
Application Technical Parameters Wood Adhesives Press time: 60-90 sec at 110°C Coatings 10-15% resin solids content Paper Impregnation 40-50% pickup rate Curing System Acid catalyst required (pH 3-5) Pot Life 4-8 hours (after catalyst addition) Key Features:
Enhanced water resistancevs conventional UF resins
Lower formaldehyde emission(<0.1 ppm by chamber test)
Improved flexibilitywith butoxylation modification
Excellent adhesionto cellulose materials
Thermosettingwith irreversible cure
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