纳米二氧化硅@壳聚糖磷酸酯增强氯氧化镁胶凝材料工程性能的研究  

Study on nano-silica@chitosan phosphate for enhancing engineering properties of magnesium oxychloride gelling material

作　　者：刘启昊 杨朋伟 陈若愚[1] LIU Qi-hao;YANG Peng-wei;CHEN Ruo-yu(School of Petrochemical Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学石油化工学院,江苏常州213164

出　　处：《现代化工》2025年第2期216-221,共6页Modern Chemical Industry

摘　　要：以双氧水修复并活化纳米二氧化硅表面羟基,通过分子间脱水将壳聚糖磷酸酯负载到纳米二氧化硅表面制备了纳米二氧化硅@壳聚糖磷酸酯,将纳米二氧化硅@壳聚糖磷酸酯添加到氯氧化镁胶凝材料中进行耐水改性。结果表明,纳米二氧化硅@壳聚糖磷酸酯的加入增加了氯氧化镁胶凝材料各龄期的抗压强度,改性后的氯氧化镁胶凝材料养护龄期7 d和28 d的抗压强度分别为116 MPa和127 MPa,比未改性试样增加了11.5%和5.8%。改性后的氯氧化镁胶凝材料水泡28 d后的抗压强度高达102 MPa,比相同水泡时长下磷酸改性的试样高8.3%。同时,纳米二氧化硅@壳聚糖磷酸酯可以细化氯氧化镁胶凝材料的孔结构。Hydrogen peroxide is used to repair and activate the hydroxyl groups on the surface of nano-silica,and then chitosan phosphate is loaded onto the surface of nano-silica through intermolecular dehydration to prepare nano-silica@chitosan phosphate.The prepared nano-silica@chitosan phosphate is added into magnesium oxychloride gelling material for water resistance modification.Study results show that the addition of nano-silica@chitosan phosphate enhances the compressive strength of magnesium oxychloride gelling material at different curing ages.The compressive strength of the modified magnesium oxychloride gelling material at 7 days and 28 days are 116 MPa and 127 MPa,respectively,which increase by 11.5%and 5.8%compared with the unmodified samples.The compressive strength of the modified magnesium oxychloride gelling material after 28 days of water immersion maintains as high as 102 MPa,which is 8.3%higher than that of the phosphoric acid modified sample under the same water immersion duration.Furthermore,it is found that nano-silica@chitosan phosphate can refine the pore structure of magnesium oxychloride gelling material.

关 键 词：纳米二氧化硅 氯氧化镁胶凝材料 抗压强度 耐水性 

分 类 号：TQ177.5[化学工程—硅酸盐工业]