The efficacy of Alkyl Ketene Dimer (AKD) wax as a sizing agent in papermaking is heavily dependent on its proper emulsification. NINGBO INNO PHARMCHEM CO.,LTD. emphasizes that correctly prepared AKD emulsions are crucial for achieving the desired hydrophobicity, printability, and overall paper quality. This guide outlines the key steps and considerations involved in AKD emulsion preparation.

The primary goal of AKD emulsion preparation is to create a stable dispersion of AKD wax particles in water. This is typically achieved by combining AKD wax with water and emulsifying agents. The process usually involves heating the AKD wax to melt it and then gradually adding it to a mixture of water and stabilizers under controlled conditions. The stabilizers, often cationic starches or polymers, play a critical role in preventing the coalescence of AKD droplets and ensuring the long-term stability of the emulsion.

Key parameters that need careful control during AKD emulsion preparation include temperature, pH, and the concentration of emulsifying agents. The temperature must be sufficient to keep the AKD wax in a molten state but not so high as to cause degradation or unwanted side reactions. The pH of the system is also important, as it influences the effectiveness of the emulsifiers and the stability of the final emulsion. Typically, AKD emulsions are maintained at a slightly acidic pH, often between 2 and 4, to enhance stability.

The selection of appropriate emulsifiers and stabilizers is another critical aspect. NINGBO INNO PHARMCHEM CO.,LTD. recommends using high-quality, specifically designed emulsifiers that are compatible with AKD and the papermaking process. The ratio of AKD wax to emulsifier and water must be optimized to achieve the desired particle size distribution and stability. The process often involves high-shear mixing to ensure thorough dispersion of the wax particles.

Once prepared, AKD emulsions typically have a shelf life of several months when stored under appropriate conditions (cool, dry, and protected from moisture). Proper handling and storage are essential to maintain the emulsion's integrity and performance. By understanding and meticulously following these steps in AKD emulsion preparation, paper manufacturers can ensure they are applying a high-quality sizing agent that delivers excellent results, as supported by the expertise and products from NINGBO INNO PHARMCHEM CO.,LTD.