Calcium Oxide[3]
Overview
Calcium oxide (CaO), or quicklime, is a versatile inorganic compound produced by thermally decomposing limestone (calcium carbonate). Its high reactivity, particularly with water, makes it valuable for adhesion enhancement in industrial processes. In adhesive formulations, calcium oxide acts as a filler and curing agent, improving bond strength and heat resistance. It is also used to modify viscosity and accelerate setting times in coatings and mortars.
Physical and Chemical Properties
Calcium oxide appears as a white, odorless solid with a crystalline structure. It has a high melting point (2572°C) and reacts vigorously with water to form calcium hydroxide (slaked lime), releasing significant heat. Its alkaline nature (pH ~12.4) contributes to its adhesion-promoting properties by neutralizing acidic components and enhancing cross-linking in polymer matrices. The compound is hygroscopic, requiring careful storage to prevent unintended reactions.
Main Applications
In adhesives and sealants, calcium oxide improves cohesion in rubber-based products like tires and conveyor belts. It also serves as a cost-effective additive in construction materials (e.g., cement, plaster) to enhance durability. The steel industry utilizes it as a flux to remove impurities, while agriculture employs it for soil pH adjustment. Recent innovations include its use in eco-friendly adhesives for wood composites and packaging materials.
Safety and Storage
Calcium oxide poses significant hazards due to its corrosivity and exothermic reaction with moisture. Always wear gloves, goggles, and respirators when handling. Storage requires airtight, moisture-proof containers in dry environments. In case of contact, rinse affected areas with copious water and seek medical attention. Spills should be contained with dry sand or vermiculite, never water, to avoid heat generation.
B2B Procurement Guide
Industrial buyers should prioritize suppliers offering technical data sheets (TDS) and certificates of analysis (CoA). Key specifications include purity (≥90% for adhesion applications), particle size (200-400 mesh for uniform dispersion), and low heavy metal content. Bulk purchases (20+ tons) typically reduce costs by 15-20%. Consider regional suppliers to minimize transportation risks, as moisture exposure during transit can degrade quality.
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