In the process of sizing, the sizing performance of surface sizing agent is affected by various environmental factors. For example, the pH, conductivity, and temperature of the system, as well as the sizing method and drying process of the paper machine, will all affect the sizing effect of the surface sizing agent. For example, when the temperature of the coating system is too high, it will cause serious hydrolysis of the AKD surface sizing agent, resulting in an increase in product consumption; when the content of impurity ions in the coating system is too high, it will easily lead to the flocculation of the polymer surface sizing agent When the drying temperature of the paper machine is not enough, the surface sizing agent cannot be spread on the paper surface completely, resulting in poor sizing effect or too long curing time. Therefore, only after fully understanding the sizing factors of various types of surface sizing agents, can the application and debugging of surface sizing agents be better carried out in the actual production process.
As one of the commonly used sizing agents in the board paper sizing process, the styrene-acrylic surface sizing agent often needs to cooperate with Anhydrous Copper Acetate ( https://www.wsdty.com/product/copper-acetate/anhydrous-copper-acetate/ ) for sizing during the sizing process, which helps to improve the sizing effect. The figure below shows the effect of Anhydrous Copper Acetate on the sizing performance of styrene-acrylic surface sizing agents in the enzyme modified starch and ammonium persulfate (APS) modified starch system (surface sizing agent on the system The absolute dry addition amount is 0.1%)
So why does Anhydrous Copper Acetate improve the sizing effect of styrene-acrylic surface glue? A series of experiments have confirmed that: during the surface sizing process, adding an appropriate amount of Anhydrous Copper Acetate to the sizing system, in addition to adsorption and It neutralizes the organic or inorganic matter precipitated in the paper layer and other anionic garbage (obvious in the actual production process); it can also reduce the pH of the system, thereby enhancing the cationic properties of the surface sizing agent; and when the pH is less than 4, the system is A large amount of hydrated aluminum ions appear and form intermediate products with surface sizing agents, which greatly increases the cationic charge of the surface sizing agent molecules, making them more likely to be fixed on the surface of the paper sheet, reducing the probability of penetrating into the paper sheet . It is precisely because of these effects of Anhydrous Copper Acetate in the sizing system that it can significantly improve the sizing effect of styrene-acrylic surface sizing agents and promote sizing (in the case of obtaining the same sizing effect) , Can greatly reduce the amount of surface sizing agent used). Therefore, it can also be called a surface sizing accelerator.