Overview
Alkyl Ketene Dimer (AKD) is a reactive organic compound primarily used as a sizing agent in the paper industry. It reacts with hydroxyl groups on cellulose fibers to create water-repellent paper products. Developed in the mid-20th century, AKD replaced rosin-based sizers due to its superior performance in neutral/alkaline papermaking conditions. AKD is synthesized via the dimerization of ketenes derived from fatty acids. Its versatility extends to textiles and construction materials, where hydrophobicity is required. Commercial grades vary by alkyl chain length (typically C14–C18), affecting melting points and reactivity.
Physical and Chemical Properties
AKD is a waxy solid with low solubility in water but high solubility in nonpolar solvents. Its reactivity stems from the strained β-lactone ring, which opens to bond with cellulose. Thermal stability is moderate, with decomposition occurring above 100 °C. The compound’s hydrophobicity is achieved by covalent bonding with paper fibers, forming a stable ester linkage. This property is pH-dependent, performing optimally in neutral to slightly alkaline conditions. AKD emulsions are often stabilized with cationic starch for even application in paper mills.
Main Applications
Over 90% of AKD is consumed by the paper industry for sizing printing/writing grades, packaging, and labels. It reduces ink bleed and improves print quality. Specialty applications include moisture-resistant cardboard and release liners. In textiles, AKD-treated fabrics resist water absorption while retaining breathability. Construction materials like gypsum boards also utilize AKD to mitigate water damage. Emerging uses include biodegradable coatings and 3D printing supports.
Safety and Storage
AKD is classified as an irritant (H315, H319) and requires gloves, goggles, and ventilation during handling. Dust exposure may cause respiratory irritation; use NIOSH-approved masks. Spills should be contained with inert absorbents. Storage requires airtight containers in temperatures below 30 °C to prevent hydrolysis. Shelf life is typically 6–12 months. Incompatible with strong acids/bases and oxidizers. Dispose of waste per local regulations, avoiding water sources due to aquatic toxicity risks.
B2B Procurement Guide
Procure AKD based on alkyl chain length (C16 most common), purity (>95% preferred), and emulsion stability. Request technical datasheets with reactivity rates and free fatty acid content. Bulk shipments (25 kg bags or totes) often offer cost savings. Verify supplier certifications (ISO 9001, FSC for paper applications). Sample testing is advised to confirm compatibility with production processes. Chinese manufacturers dominate supply, but EU/US producers may offer stricter QC. Lead times vary from 2–6 weeks for custom formulations.
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