SBR latex (Styrene-Butadiene Rubber latex) is a synthetic rubber emulsion, widely used in various industrial and construction applications due to its excellent bonding, flexibility, and water resistance properties. Here's a detailed overview:
🔬 Chemical Composition
SBR latex is a copolymer of styrene (C₈H₈) and butadiene (C₄H₆).
It's produced via emulsion polymerization, resulting in a milky-white, water-based liquid.
⚙️ Properties
Property Description
Appearance Milky white liquid
pH Typically 9–10 (alkaline)
Solid Content 45%–55% (varies by manufacturer)
Particle Size 100–300 nm
Viscosity Low to moderate
Film Forming Temp ~0 to 5°C
Tensile Strength High (enhanced when cured or blended)
Water Resistance Excellent when fully cured
🧪 Key Features
Improves flexibility and reduces cracking in mortars and concrete
Enhances adhesion to various substrates
Improves water resistance and reduces permeability
Compatible with cementitious materials
🏗️ Applications
Industry Uses
Construction Waterproofing slurries, bonding agents, tile adhesives, patching compounds, repair mortars
Textile Back-coating of fabrics, nonwoven binders
Paper Coating and impregnation
Carpet backing As a binder for carpet tufts
Paints & Coatings For flexibility and water resistance
🔧 Advantages over Natural Rubber Latex
More resistant to aging and heat
Better chemical resistance
More consistent quality due to synthetic production
⚠️ Handling & Storage
Store between 5–35°C; avoid freezing
Use personal protective equipment (PPE)
Shelf life is typically 6–12 months in sealed container.