SPHERICAL CALCIUM CARBONATE DEDICATED FOR STONE PAPER AND PREPARATION METHOD THEREFOR

摘要

Provided is a spherical calcium carbonate having good fluidity when heated. The spherical calcium carbonate is formed by the polymerization of spherical calcium carbonate with caprolactam that has permeated the micropores on the surface of the spherical calcium carbonate. The high pressure of a high-pressure dilatant fluid apparatus is used to drive a fluid to permeate the surface of fine spherical calcium carbonate. Then the pressure is suddenly released, and the energy accumulated on the surface of the fine spherical calcium carbonate expands and forms micropores on the surface of the spherical calcium carbonate due to the rapid release; the spherical heavy calcium carbonate in the surface micropores adsorbs the caprolactam and undergoes polymerization to form spherical calcium carbonate of which the surface is embedded with the caprolactam polymer. When the spherical calcium carbonate is used for processing stone paper raw material, the spherical nature of calcium carbonate and the high plasticity nature of the caprolactam polymer substantially enhance the processing fluidity and dispersity of the stone paper, and reduce or eliminate the use of lubricant additive, thereby achieving good processing fluidity for the stone paper.