Overview
Polyurethane adhesive putty for stone is a high-strength, solvent-free, two-component bonding material formulated for repairing, filling, and adhering natural and artificial stone surfaces. Its chemical structure provides excellent adhesion, durability, elasticity, and resistance to moisture, impact, and temperature variations.
Description
This putty consists of a reactive polyurethane binder, mineral fillers, rheology modifiers, and curing agents. When the two components are mixed, a crosslinked polymer network forms, ensuring durable adhesion on marble, granite, ceramic, composite stone, and concrete-based stone surfaces.
Definition
A solvent-free polyurethane adhesive putty for stone is a non-shrinking, thixotropic, gap-filling adhesive designed for structural bonding and stone restoration applications.
Meaning
This adhesive represents a modern alternative to polyester and epoxy stone adhesives, offering improved flexibility, superior water resistance, and better vibration tolerance.
Production & Preparation
Preparation of Solvent-Free Polyurethane Adhesive Putty for Stone
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Add the polyurethane prepolymer into a mixer.
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Slowly incorporate mineral fillers to achieve the required viscosity.
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Add thickeners and silane-based adhesion promoters.
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Introduce pigments as required.
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Prepare the curing component separately (polyol or isocyanate-based hardener).
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Pack the two components (A+B) separately to prevent premature curing.
Manufacturing Process
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Component A: Prepolymer + fillers + additives
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Component B: Curing agent
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Mix ratio typically 1:1 or 2:1 depending on formulation.
Formula (General Example)
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Polyurethane Prepolymer
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Mineral Fillers (Calcium carbonate / Silica)
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Rheology Modifiers
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Adhesion Promoters (Silane)
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Pigments
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Polyol/Isocyanate Hardener (Component B)
Formulations
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PU prepolymer + filler system + catalyst + silane + curing agent.
Properties
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High bonding strength
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Excellent gap-filling capability
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Solvent-free
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Elastic, impact-resistant structure
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High chemical, humidity, and aging resistance
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No shrinkage
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Suitable for vertical application due to thixotropic texture
Applications
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Bonding natural stones (marble, granite, travertine)
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Structural reinforcement of cracked stone
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Stone surface restoration
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Filling cavities, gaps, fractures
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Bonding stone to metal, concrete, ceramic, and composite materials
Usage
Mix Component A and Component B thoroughly until a uniform paste is formed. Apply immediately to the stone surface. Full cure occurs within several hours depending on temperature.
Cost
Varies depending on filler quality, polyurethane type, packaging, and application-specific additives.
Types
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Two-component solvent-free PU putty
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Fast-curing polyurethane putty
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High-flexibility PU adhesive putty
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Heavy-duty structural bonding PU putty
Advantages
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Strong adhesion
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Flexible yet durable
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Water- and weather-resistant
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Safe solvent-free formulation
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Excellent for vertical and overhead repair applications
SUMMARY
Polyurethane adhesive putty for stone is a versatile, high-performance, two-component bonding system designed for structural stone repair and adhesion. Its solvent-free polyurethane matrix ensures flexibility, superior bonding strength, and long-term durability, making it ideal for use in construction, restoration, and stone processing industries.
