Overview
Cyclohexanediamine (CHDA) is an aliphatic diamine with two primary amine groups attached to a cyclohexane ring. As a key intermediate in specialty chemical production, it exists as three stereoisomers (cis/trans 1,2-; 1,4-), each with distinct reactivity patterns. The 1,2-isomer is particularly valued in polymer chemistry for its balanced reactivity and ability to impart flexibility to cured resins. Industrial production typically involves hydrogenation of corresponding aromatic diamines, with purity levels exceeding 98% for most technical applications.
Physical and Chemical Properties
CHDA exhibits typical amine characteristics with moderate alkalinity (pKb ~3.5). Its cycloaliphatic structure provides greater thermal stability compared to linear diamines, with decomposition temperatures above 200°C. The viscosity ranges between 10-15 mPa·s at 25°C, making it suitable for formulation work. Notably, CHDA forms stable complexes with metal ions, contributing to its use as a corrosion inhibitor. The compound undergoes predictable reactions with epoxides, isocyanates, and carboxylic acids, with reaction rates varying significantly between isomers. Technical grade typically contains 70-80% trans-1,2 isomer with minor amounts of other isomers.
Main Applications
Approximately 65% of CHDA production is consumed by epoxy curing applications, where it modifies crosslink density and glass transition temperatures. In polyamide synthesis, it creates resins with improved chemical resistance for marine coatings and industrial adhesives. The chemical also serves as a building block for pharmaceutical intermediates and asymmetric catalysis ligands. Emerging applications include gas separation membranes and water treatment chemicals, leveraging its selective metal-binding properties. Formulators value CHDA for its low volatility compared to ethyleneamine alternatives.
Safety and Storage
As a Category 8 corrosive substance, CHDA requires corrosion-resistant packaging (stainless steel or polyethylene). Storage tanks should incorporate nitrogen blanketing to prevent discoloration and maintain purity. The compound's flash point of 75°C necessitates standard flammability precautions. Personnel handling CHDA must wear chemical goggles, nitrile gloves, and vapor respirators when ventilation is inadequate. Spill response requires neutralization with weak acids before containment. Shelf life typically exceeds 24 months when stored below 30°C with minimal air exposure.
B2B Procurement Guide
Industrial buyers should specify required isomer ratios, with trans-1,2-CHDA commanding premium pricing. Bulk shipments (ISO tankers or 200kg drums) commonly offer 10-15% cost advantages over small packaging. Request certificates of analysis for amine value (typically 980-1020 mg KOH/g) and moisture content (<0.5%). Consider regional suppliers for logistical efficiency - major producers operate in China, Germany, and the US. Technical support packages often include formulation guidance and regulatory documentation. For specialty applications, custom isomer blends may require minimum order quantities of 5-10 metric tons.
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