Introduction
Polyurethane adhesive putty for marble is a two-component, solvent-free, high-strength bonding material designed for repairing, bonding, filling, and fixing natural stone surfaces. Its durability, chemical resistance, and excellent adhesion make it ideal for marble processing, restoration, and installation.
Meaning & Definition
Polyurethane adhesive putty for marble refers to a polyol + isocyanate reactive system that cures into a tough, elastic, highly adhesive polymer. It is engineered to bond porous and non-porous stone substrates with strong mechanical grip.
Key Ingredients (Chemicals & Raw Materials)
1. Polyol Component (A-Component)
These are the backbone materials providing flexibility, viscosity, and bonding characteristics:
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Polyether Polyol – main reactive resin; defines elasticity & toughness
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Polyester Polyol – improves hardness and chemical resistance
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Fillers (Calcium Carbonate / Marble Powder / Talc) – thickens, reduces cost, improves body
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Thixotropic Agents (Fumed Silica, Organoclays) – prevents sagging, increases paste strength
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Plasticizers – improves spreadability and handling
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Pigments (Titanium Dioxide, Iron Oxides) – color adjustment
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Additives (Defoamers, Wetting Agents, Dispersants) – stabilizes mixture and eliminates air bubbles
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Adhesion Promoters (Silane Coupling Agents) – increases bonding to marble surfaces
2. Isocyanate Component (B-Component)
Provides crosslinking and final curing performance:
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MDI (Methylene Diphenyl Diisocyanate) – Polymer Grade
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Modified MDI Pre-Polymers – reduces viscosity, improves workability
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Catalysts (Organometallic or Amine Catalysts, if needed) – accelerates curing
Optional Functional Ingredients
Used depending on performance needs:
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Accelerators – faster setting
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UV Stabilizers – improves resistance to yellowing
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Anti-Shrink Additives – prevents volume loss during curing
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Reinforcing Powders (Quartz, Alumina) – increases hardness
Summary
Polyurethane adhesive putty for marble is formulated from polyols, isocyanates, fillers, thickeners, pigments, plasticizers, and adhesion-enhancing additives. Together, these ingredients create a high-strength, flexible, solvent-free putty ideal for marble bonding, repairing, gap-filling, and structural stone applications.
