The AKD Emulsion Manufacture And Its Performance Study

In the AKD neutral sizing manufacture industry, there will be much economic profit when shift the AKD wax from import to local supplier. However consider there are some difference between import AKD wax with local AKD wax, such as the raw materials of AKD wax, a little bit poor in impurity, stability and sizing performance in local AKD wax. We focus on analyze and optimize the process of AKD emulsion manufacture to get the good paper machine application results with local AKD wax by optimize the AKD emulsion formulation and process, try to improve the performance of local AKD wax sizing emulsion by enhance the emulsion stability, assay and decrease the deposit in emulsion.We have analyzed the import and local AKD wax, the results show there are difference in import and local AKD wax in molecular carbon chain. for the local AKD wax, the carbon chain is much longer than import's, and the more the emulsification agent has been added to AKD emulsion with local AKD, the more good particle size distribution emulsion you will get. That is to say, even with the local AKD wax, we can get the good particle size distribution emulsion with good stability and good paper machine application results.Before emulsify the AKD wax, a lab testing should be carry out to determine its the melting point according to different sourcing AKD wax. When making emulsion with local AKD with poor stability, we can increase the temperature during the melting, pre-mixing and homogenization steps to achieve good emulsification results to get good particle size distribution and stabile products.The key parameter in AKD emulsion relate to sizing performance is AKD assay. Due to the difference in manufacture process, equipment and raw materials, the import AKD wax has much higher assay. The main AKD assay loss is hydrolyzation, the hydrolyzation degree and speed depend on the temperature, the much higher temperature, the more rapid hydrolyze reaction and higher degree in hydrolyzation. The assay loss can be decreased during the AKD emulsification if control the temperature to a proper value and control the steps which there is hydrolyzation reaction. When use local AKD, if we control the emulsification temperature to 70℃and optimize the manufacture process, good AKD emulsion can be got and all characteristic meet specification requirement, the sizing performance can be same level with the emulsion with import AKD wax.The good particle size distribution emulsion can be got when using the local AKD wax by formulation and process modification, and then can reduce the deposit issue in paper application.