磷酸镁水泥的聚合物改性研究

对于磷酸镁水泥,选择使用原材料是重要的改性方法.为提高材料性能,通过变化聚合物乳液种类及掺量,试验研究聚合物对磷酸镁水泥的适用性.结果表明:聚合物乳液的物理性质粘度与改性磷酸镁水泥的密度、流动性及凝结时间有较紧密联系;而聚合物乳液的化学性质pH值则可能是影响改性磷酸镁水泥力学性质的重要因素;合适的聚合物乳液在适宜掺量下能对改性磷酸镁水泥的抗压强度产生较小影响,提高材料的抗折强度与粘结强度,并显著增大断裂能;掺加聚合物乳液不改变磷酸镁水泥的水化产物类型,但显著影响水化产物的形貌与结构的密实程度.

Modification of Magnesium Phosphate Cement by Polymers

The selection of suitable raw materials is an important method to improve the performance of magnesium phosphate cement. By changing the kind and amount of polymer emulsions added in magnesium phosphate cement, the applicability of polymers was studied. The results show that the viscosity of polymer emulsions is well correlated with the density, fluidity and setting time of modified magnesium phosphate cement; the pH value of polymer emulsions is an important factor affecting the mechanical properties of modified magnesium phosphate cement; the effect of a suitable polymer emulsion and its dosage on the compressive strength of modified magnesium phosphate cement is comparatively less, but it can improve the bond strength and flexural strength of the material and significantly increase its fracture energy. Adding polymer emulsions does not change the type of hydration products. However, the morphology of hydrated products and its dense degree are significantly affected.