| 摘要 |
<p>A method for manufacturing multi-purpose fillers having buoyancy is provided to produce a buoyant material by forming a waterproofing coating layer on porous stone and reduce a production cost by using recycled urethane as a main material. A method for manufacturing multi-purpose fillers having buoyancy includes the steps of: (s10) sorting waterless porous stone particles by size; (s20) stirring 75-90wt% of the sorted porous stone particles and 10-25wt% of a primer in an agitator to impregnate the porous stone particles with the primer; (s30) stirring 60-75wt% of the resultant porous stone particles and 25-40wt% of recycled resins as a waterproofing material to form a first waterproofing coating layer on the primer-coated porous stone particles; (s40) spraying a proper amount of calcium carbonate while stirring the porous stone having the first waterproofing layer so as to prevent cohesion of the porous stone particles; (s50) curing the first waterproofing coating layer of the porous stone; (s60) stirring 65-75wt% of the cured porous stone and 25-35wt% of a waterproofing material in an agitator to form a second waterproofing coating layer; (s70) stirring the obtained porous stone particles while adding 80-90wt% of calcium carbonate and 10-20wt% of a tourmaline powder, and stirring the porous stone having the second waterproofing coating layer in such a way that the particles do not cling to one another; and (s80) curing the obtained porous stone particles.</p> |
