The present invention relates to a preparation method of low-density stone paper. The preparation steps are as follows: hydrating lime CaO with water at a weight ratio of 1:5 in a digester at 70°C, and refining the lime milk by ultrasonic dispersion; encapsulating stable nitrogen in nanoscale bubbles in the lime milk using a foaming agent; under the synergistic effect of a hollow inducer, reacting the lime milk after sufficient carbon dioxide is introduced to form low-density spherical calcium carbonate with nanoscale bubbles as the core and calcium carbonate as the shell; blending the low-density spherical calcium carbonate with a polymer for granulation, followed by stretch molding to obtain low-density stone paper.
Country Code: CN
Application Number: CN201210368061.4
