Hydroxypropyl methyl cellulose

According to the hydroxypropyl methyl cellulose, a composite filler serves as a matrix and is connected with modified cellulose through a hydrogen bond or a coupling agent, the hydroxypropyl methyl cellulose serves as a cement admixture, and the hydroxypropyl methyl cellulose can be evenly dispersed in cement due to the structure and special functional groups of the hydroxypropyl methyl cellulose; the nano-material is not easy to gather in cement, the performance of the material is fully played, the high specific surface area of the nano-material is beneficial to the combination of hydroxypropyl methyl cellulose and a cement matrix, a stress transfer bridge is formed on a fiber-cement matrix interface, the bonding strength is improved, and the mechanical property of the cement is improved. And good retarding and tackifying effects are also achieved. 本发明公开了一种羟丙基甲基纤维素，其中羟丙基甲基纤维素是以复合填料为基体，通过氢键或偶联剂连接改性纤维素，将其作为一种水泥外加剂，其本身结构以及特殊官能团使得羟丙基甲基纤维素可以在水泥中均匀分散，使得纳米材料在水泥中不易聚集，充分发挥出材料本身的性能，同时其高比表面积有利于羟丙基甲基纤维素与水泥基体的结合，在纤维-水泥基体