The value of oil-absorbing is 25.40g DOP/100g CaCO_3.The activation grade of the modified nano-calcium carbonate reaehed 1,which shows the surface of the nano-CaCO_3 was modified from hydrophilic to hydrophobic.

• 改性后纳米碳酸钙粉体的吸油值为25.；40g DOP/100g CaCO3；活化度为1；表明改性后的纳米碳酸钙已经由亲水性变为疏水性。