水化硅酸钙超细粉体制备及表面改性  

PREPARATION OF SUPER-FINE POWDER OF HYDRATED CALCIUM SILICATE AND THE SURFACE MODIFICATION

作　　者：彭小芹 赵会星[1] 蒋小花[1] 许国伟[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400045

出　　处：《硅酸盐学报》2008年第A01期176-179,共4页Journal of The Chinese Ceramic Society

基　　金：重庆市自然科学基金(2001-54)资助项目。

摘　　要：用生石灰和石英砂作为原材料,在水热反应条件下,制备了水化硅酸钙超细粉体。采用偶联剂干法改性处理方法,对水化硅酸钙粉体进行表面改性试验。对处理后的改性粉体进行沉降值和吸油值的测定,以评估改性剂种类、改性剂掺量对水化硅酸钙粉体表面改性的影响。实验发现:铝酸酮类偶联剂H-4,501和502改性水化硅酸钙粉体,其吸油值分别为20,35(mL/100g)和36(mL/100g)(以100g改性粉体吸收邻苯二甲酸二辛酯的体积),沉降值分别为0.2,0.4mL和0.3mL;钛酸醑类偶联剂改性粉体其吸油值上升到40(mL/100g),沉降值为0.5mL;硅烷偶联剂改性粉体的吸油值为87(mL/100g),沉降值为0.65 mL。通过激光粒度分布仪检测,未改性水化硅酸钙粉体其平均粒度为0.972μm,经1%铝酸酯类偶联剂H-4改性处理后其平均粒径降低到0.56μm,粉体的分散性大为提高。结果表明:以铝酸酯类偶联剂对水化硅酸钙粉体的改性效果较好,钛酸酯类偶联剂次之,硅烷类偶联剂改性效果较差。Super-fine hydrated calcium silicate powder was prepared by the hydrothermal technology with a high pressure kettle, quartz sand as the siliceous materials and the lime as calcium material. Different modifiers were used to modify the surface of hydrated calcium silicate powder through dry modified process. The effects of modifier types and the content of modifier on the surface modification of hydrated calcium silicate powder were investigated. It was found that the oil absorption values were 20 （mL/100g）, 35 （mL/100g） and 36 （mL/100g） for aluminum ester coupling agent H-4, 501 and 502 respectively, 40 （mL/100g） for titanate ester coupling agent and 87 （mL/100g） for silane coupling agent. And the settlement values were 0.2 mL, 0.4 ml and 0.3 mL for aluminum ester coupling agent H-4, 501 and 502 separately, 0.5 mL for titanate ester coupling agent and 0.65 mL for silane coupling agent. The average size of hydrated calcium silicate powder tested by laser particle size distribution measurement was 0.972μm. However, after dry modified with content of 1%（ in mass） aluminum ester coupling agent H-4, the average particle size decreased to 0.56μm and the dispersion increased greatly. The results showed that the best modifier to hydrated calcium silicate powder was aluminum ester coupling agent, and the effect of silane coupling agent was poor.

关 键 词：水化硅酸钙 水热合成 超细粉体 表面改性 

分 类 号：TU502[建筑科学—建筑技术科学]