Cement grinding aid, preparation method thereof and cement

The invention relates to the technical field of building materials, and particularly discloses a cement grinding aid, a preparation method thereof and cement. The cement grinding aid is prepared from the following raw materials in parts by weight: 30 to 40 parts of modified alcohol amine, 10 to 20 parts of sodium tripolyphosphate, 20 to 35 parts of p-aminophenol, 4 to 6 parts of sodium thiocyanate, 6 to 8 parts of nano negative ion powder and 60 to 80 parts of water. The preparation method comprises the step of mixing all the raw materials. According to cement produced by the cement grinding aid disclosed by the invention, the 45 mu m screen residue can reach 8.3 to 6.1 percent, the 3d compressive strength and the breaking strength can respectively reach 30.1 to 35.3 MPa and 8.2 to 9.5 MPa, the 28d compressive strength and the breaking strength can respectively reach 53.5 to 62.8 MPa and 9.7 to 11.2 MPa, the grinding effect is good, and the cement strength is high. 本申请涉及建筑材料的技术领域，具体公开了一种水泥助磨剂及其制备方法与水泥。一种水泥助磨剂