Conclusions

The adsorption of the LS at the water-solid interface is characterized by high values of the non-electrical portion of the free energy of adsorption, which provide effective adsorption on the surfaces charged similarly to LS. Balance of the LS adsorption forces can be regulated by modification with silicon containing organic oligomers enhancing polymer hydrophobicity. Modification of LS with silicon oligomers changes hydrophilic properties and introduces new active centers in the LS molecules, which results in the increased interaction with the synthetic flocculant PAA. The developed dual retention system Si-LS-PAA reveals high flocculation effect towards organic and inorganic components of paper compositions and could be recommended as a special additive for operating characteristics improvement of non-bleached paper and cardboard.

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