Abstract
The article is focused on the influence of inorganic salts on the adsorption of cationically modified starch to fibers. Results show that low concentrations of inorganic salts usually affect the process of adsorption in a positive way. Adsorption efficiency at higher concentrations, however, depends on the type of inorganic salts as well as the sequence of adding inorganic salts and starch to paper suspension.
Highlights
One specific characteristic of a paper suspension is its complex composition; it contains suspended particles as well as colloids and soluble substances
Salt concentrations below 3 mS/cm do not affect the adsorption of cationically modified starch, whereas above this value, the adsorbed amount changes according to the type of inorganic salt present
In addition to the charges of fiber surface and polyelectrolytes, electrostatic forces are affected by the charges of other substances in the paper stock as well, i.e. inorganic salts formed from fillers and chemicals in process water
Summary
One specific characteristic of a paper suspension is its complex composition; it contains suspended particles as well as colloids and soluble substances. Electrostatic forces are either attractive in cases of oppositely charged particles, or repulsive if the surface of a particle has got the same charge. The electrostatic charge is accumulated on the surface of solid particles in paper suspension and represents the consequence of the disassociation of carboxylic groups, filler ionisation and substance adsorption to fiber surface [2]. The depletion of the electric double layer signifies a smaller potential difference causing a decrease in a particle’s attraction in comparison with oppositely charged groups. Adsorption efficiency decreases together with an increasing concentration of salts, which shows that the attraction between the surface and the polyelectrolyte is mostly of electrostatic character. The application of cationic starch positively affects paper properties, which is the consequence of bond strengthening between fibers by means of a hydrogen bond between the free hydroxyl group on cationic starches and acidic groups on pulp fibers [8]
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