FIELD: chemistry.
SUBSTANCE: aqueous polysilicate composition is meant for producing paper and cardboard and can be used in pulp and paper industry. The aqueous polysilicate composition contains a component based on polysilicate microgel combined with particles obtained from colloidal polysilicate. The method of preparing the aqueous polysilicate composition involves mixing aqueous colloidal polysilicate with an aqueous phase of polysilicate microgel. This composition or a composition obtained using the method described above can be used as a flocculant when producing paper and cardboard. The method of producing paper or cardboard involves preparation of a cellulose suspension and flocculation of said suspension using a flocculation system containing said polysilicate composition. The suspension is then drained on a mesh to form a sheet which is then dried.
EFFECT: high efficiency of the disclosed aqueous polysilicate composition owing to improved holding or draining when making paper or cardboard, as well as stability thereof during storage.
24 cl, 11 tbl, 3 ex, 9 dwg
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