Eco-Friendly Sizing Agents: A Growing Trend in Sustainable Industries
A sizing agent is a substance applied to materials like paper and textiles to modify their absorption and wear characteristics. By forming a protective coating, sizing agents enhance durability, improve surface properties, and provide resistance to liquids.
In Papermaking:
Sizing agents are crucial in controlling paper's interaction with liquids, ensuring suitability for printing and writing.
Internal Sizing Agents: Added during the papermaking process, these agents penetrate the fibers to reduce liquid absorption. Common internal sizing agents include alkyl ketene dimer (AKD), rosin, and alkyl succinic anhydride (ASA). AKD and ASA are hydrophobic compounds that react with cellulose fibers to impart water resistance. Rosin sizing, traditionally used in acidic conditions, involves the precipitation of rosin onto fibers to achieve hydrophobicity.
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