Composition and method for preparing modified calcium carbonate

Abstract

The invention relates to a composition and a method for preparing modified calcium carbonate and belongs to the field of chemicals. The composition comprises the following components: a polymer, calcium chloride and carbonate, wherein the polymer is any one or more of cationic starch, cationic guar gum, chitosan hydrochloride and 2-hydroxypropyl trimethyl ammonium chloride chitosan; and the carbonate is any one or more of potassium carbonate, sodium carbonate, ammonium carbonate and ammonium bicarbonate. The preparation method comprises the following steps of: (1) preparing aqueous solution of the polymer; (2) adding the calcium chloride into the carbonate; (3) adding the aqueous solution of the polymer into a mixture obtained by the step (2); (4) obtaining calcium carbonate precipitate; and (5) washing and drying the calcium carbonate precipitate. The method has the advantages of simpleness, temperate reaction conditions, and capability of preparing polymer modifier-containing filler and remarkably enhancing filler retention and the like.

Description

technical field [0001] The invention belongs to the field of chemicals, and in particular relates to a composition for preparing modified calcium carbonate and a method thereof for the papermaking industry. Background technique [0002] Calcium carbonate is an important inorganic filler. About 11 million tons of calcium carbonate are used in paper every year in the world, accounting for more than 60% of the total filler. As an excellent filler for cigarette paper, the role of calcium carbonate in cigarette paper is: (1) to increase the refractive index of cigarette paper, so that tobacco shreds cannot be seen from the outside of the cigarette, and the opacity is improved; ( 2) When the cigarette is burning, because calcium carbonate is heated and decomposed into carbon dioxide, the burning speed of the cigarette can be adjusted without turning off the flame; (3) increase the whiteness of the cigarette paper, because the whiteness of calcium carbonate is higher than that of w...

AI Technical Summary

Problems solved by technology

[0004] Because cigarette paper has high requirements on the evenness of the paper sheet and the safety of additives, cationic guar gum is generally used as a retention aid in its production, but the single-pass retention rate and total retention rate of calcium carbonate are still relatively low , the concentration of white water under the wire of the paper machine is too high

Due to the high concentration of white water under the net, it is not easy to purify and recycle the white water, and it will cause more fouling problems