Butylated Urea Formaldehyde Resin
Introduction
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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