High Efficiency PAM Polyacrylamide as Papermaking Filter Aid

The rigid particles that can form a porous cake layer make the filter cake have good permeability and low fluid resistance. It has chemical stability. Incompressibility within the operating pressure range. In the paper industry, filter aids are chemicals added to improve the water repellency and dehydration rate of wet paper from the papermaking web. Generally, it is a cationic polymer polyelectrolyte, such as polyethylene imide, cationic starch, polyamide, polyacrylamide, etc.

Auxiliary materials used to reduce filter cake resistance or filter medium resistance. It is usually a hard powder or fibrous solid. Filter aids are only used for filtration operations aimed at obtaining clean filtrate. There are two types of filter cake formed by filtration: one type has considerable rigidity and its structure does not change with the increase of operating pressure, which is called incompressible filter cake; The structure of another type of filter cake changes with the increase of operating pressure, resulting in a reduction in the flow path of the filtrate in the filter cake, and a sharp increase in the flow resistance of the filtrate. This is called a compressible filter cake.