The principle of dispersant is to distribute solid tiny particles as evenly as possible in another incompatible material. It refers to a coarse dispersion system composed of insoluble particles distributed in the outer phase of liquid or semi-solid. Dispersant can make the solid dispersed particles in the suspension fully wetted and evenly dispersed by the liquid phase, and reduce the separation, aggregation and sedimentation rate of solid particles in the system to a minimum to maintain the maximum dynamic stability of the suspension. Commonly used dispersants are surfactants.
In the papermaking process, paper fibers and fillers in the pulp are hydrophobic and tend to flocculate into agglomerates, and it is often difficult to produce paper with uniform performance and strength that meets the requirements. An additive needs to be added to increase the viscosity of the pulp to facilitate the uniform dispersion of fibers and fillers, so that the paper is uniform, smooth, flexible and without holes, so that the papermaking performance is stable, the paper is not easy to break and powder during papermaking, and at the same time, it can improve the tensile strength and dry and wet strength of paper products and save pulp. The added additive is called papermaking dispersant.
Papermaking dispersant is a high molecular polymer with the appearance of white small granular powder. Papermaking dispersants have good water solubility, high viscosity, and good lubricity. Papermaking dispersants can show good fiber dispersion effects with very small addition amounts (less than 1 kg per ton of absolute dry pulp). The product is non-ionic and is relatively less affected by water quality and other additives. It has stable papermaking performance and is not easy to break or lose powder. Its advantage is that it can improve the softness and uniformity of the finished paper.
Papermaking dispersants can also increase papermaking speed, save pulping time, reduce energy consumption, and have significant economic benefits. Papermaking dispersants are currently widely used in the production of low-quantity paper such as toilet paper, newsprint, cigarette paper, tea filter paper, noodle paper, napkin paper, color crepe paper, electrolytic electrolytic paper, and electrostatic copy paper.
