摘要
以实验室自制纳米CaCO_(3)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CaCO_(3)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CaCO_(3)样品的性能指标符合橡胶塑料专用纳米CaCO_(3)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CaCO_(3)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CaCO_(3)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 CaCO_(3)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 CaCO_(3)(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 CaCO_(3)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 CaCO_(3)particles.
作者
童佳佳
杨保俊
陈义雯
王百年
谢磊
TONG Jia-jia;YANG Bao-jun;CHEN Yi-wen;WANG Bai-nian;XIE Lei(School of Chemistry and Chemical Engineering,Hefei University of Technology,Hefei 230009,China)
出处
《现代化工》
CAS
CSCD
北大核心
2021年第10期129-134,共6页
Modern Chemical Industry
基金
安徽省科技重大专项(18030901100)。
作者简介
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;通讯联系人:杨保俊(1970-),男,博士,教授,硕士生导师,研究方向为无机纳米材料的制备与应用,bj_yang@hfut.edu.cn。
