机械力化学法改性白云石粉体的研究

采用机械力化学法改性工艺,以钛酸酯、铝酸酯和硬脂酸3种不同的改性剂对白云石粉体进行表面改性。通过活化指数和接触角等性能的表征,考察了各表面改性剂的改性效果;同时利用红外光谱分析对表面改性机理进行了探讨。研究表明,硬脂酸和铝酸酯的改性效果要优于钛酸酯,改性后白云石粉体表面具有良好的亲油疏水性,钛酸酯、铝酸酯和硬脂酸3种改性剂最佳的用量分别为白云石粉体质量的1%、3%和2%,此时改性白云石粉体的活化指数分别达到74.09%、98.5%和94.4%;接触角分别达到130.5°、137.3°和139.4°。红外光谱分析表明,改性后的白云石粉体颗粒表面官能团发生了变化,改性剂在白云石粉体颗粒表面吸附并可能发生了化学键合作用。

Study on Modification of Dolomite Powder by Mechanochemistry

Three different modifiers such as titanate, aluminic acid ester and stearic acid were used for mechanochemical surface modification of the dolomite powder. The modified effects of the three modifiers were investigated by characterization of activation index and contact angle, and meanwhile the surface modification mechanism was discussed by IR spectra analysis. Study shows that the modified effect of＂ stearic acid and aluminum acid ester is better than titanate, anti the modified dolomite powder have excellent oilwet hydrophohic property.The best dosage of titanate, aluminic acid ester and stearic acid is respectively 1%, 3% and 2% of the quality of dolomite powder. The activation index of the modified dolomite powder reaches 74.09%, 98.5% and 94.4% respectively, while contact Angle reaches 130.5%,137.3°and 139.4°respectively. IR spectra analysis reveals that the surface functional groups of dolomite powder particles are changed after the modification treatment. The modifiers are absorbed on the surface of dolomite powder particles and chemical bonds may be formed between them.