Micro cement and preparation method thereof

The invention discloses micro cement and a preparation method thereof, the micro cement is prepared from the following raw materials in parts by weight: 400-600 parts of Portland cement, 35-75 parts of polyester copolymer and 200-400 parts of quartz sand, and the polyester copolymer is prepared by reacting 2-methylene-1, 3-propylene glycol, vinyl trisilanol and carboxyl-terminated hyperbranched polyester according to a weight ratio of 1: (0.2-0.5): (5-8); the 2-methylene-1, 3-propylene glycol chain segment, the vinyl trisilanol chain segment and the hyperbranched polyester chain segment in the polyester copolymer jointly react with the Portland cement and the quartz sand, so that the pressure resistance and the breaking strength of the micro cement are improved, and the alkali efflorescence phenomenon is reduced. 本发明公开了一种微水泥及其制备方法，所述微水泥包括如下重量份原料：硅酸盐水泥400-600份、聚酯共聚物35-75份、石英砂200-400份，所述聚酯共聚物由2-亚甲基-1,3-丙二醇、乙烯基三硅醇、端羧基超支化聚酯按重量比1:0.2-0.5:5-8反应制得；本发明通过聚酯共聚物中的2-亚甲基-1,3-丙二醇链段、乙烯基三硅醇链段和超支化聚酯链段共同与硅酸盐水泥与石英砂发生作用，提高微水泥的耐压