以实验室自制纳米CaCO₃为原料、样品吸油值为主要考察指标，筛选并确定DL-苹果酸为较适宜的改性剂，考察并确定了较适宜的纳米CaCO₃改性工艺条件：DL-苹果酸质量分数为1.5%、改性温度为60℃、固液比为8：100、改性时间为120 min。优化改性条件下所制备改性纳米CaCO₃样品的性能指标符合橡胶塑料专用纳米CaCO₃国家标准（Ⅰ型）样品的指标要求。样品FE-SEM、XRD和FT-IR分析结果表明，改性前后纳米CaCO₃样品均为方解石型和球霰石型的混合相；改性前后样品分散性较好，粒径约为20~50 nm；DL-苹果酸主要通过在纳米CaCO₃颗粒表面附着进行改性，降低样品的吸油值，同时改变样品不同晶型间的含量。

DL-malic acid is screened and determined as the more suitable modifier by using laboratory-made nano CaCO₃ as raw material and taking the oil absorption of the samples as main index.Meanwhile, the suitable modification conditions are investigated and determined as follows:the dosage of DL-malic acid is 1.5%, the modification temperature is at 60℃, the ratio of solid to liquid is 8:100, and the modification time is 120 min.The as-prepared samples under the suitable modification conditions can meet the requirements of nano CaCO₃ (the type I) in China's national standard for rubber and plastics.Analysis on the samples by FE-SEM, XRD and FT-IR shows that nano CaCO₃ samples before and after modification are both mixed phases of calcite and vaterite.Both the samples have good dispersion with particle size in the range of 20-50 nanometers.In addition, DL-malic acid reduces the oil absorption value of the sample and changes the content of crystal forms of the samples mainly by adhering to the surface of nano CaCO₃ particles.

童佳佳(1993-),女,硕士研究生,研究方向为无机纳米材料的制备与应用,tongjiajiajj@163.com