改性纳米碳酸钙用于硅酮胶的触变性研究  

Study on Thixotropy of Modified Nano Calcium Carbonate Used in Silicone Sealant

作　　者：刘亚雄 姚理修 滕辉 Liu Yaxiong;Yao Lixiu;Teng Hui(Qingzhou Yuxin Calcium Industrial Co.,Ltd.,Qingzhou,Shandong262500,China)

机构地区：[1]青州宇信钙业股份有限公司,山东青州262500

出　　处：《中国建筑防水》2021年第8期20-25,共6页China Building Waterproofing

摘　　要：采用碳化法合成纳米碳酸钙,在反应过程中调整碳化Ca(OH)_(2)生浆浓度为6%~10%、起始温度为20~26℃、硬脂酸用量4%,可制得粒径50~90 nm、吸油值23~27 g、比表面积23~28 m^(2)/g的纳米碳酸钙;该纳米碳酸钙进行DOP糊和硅酮胶的应用试验,其触变环面积为10000~25000 Pa/s、屈服值为100~200 Pa、宾汉黏度为0.38~0.51 Pa·s,硅酮胶下垂度≤2 mm,性能符合GB 16776—2005《建筑用硅酮结构密封胶》标准的要求;采用羟基硬脂酸和羧基硅烷偶联剂代替硬脂酸作为表面处理剂,则触变环面积为28000~33000 Pa/s、屈服值为204~228 Pa、宾汉黏度为0.46~0.52 Pa·s,硅酮胶下垂度为0 mm,触变性更好。Nano CaCO3 is synthesized by carbonization process.During the reaction process,the carbonized Ca(OH)_(2) slurry is adjusted to 6%~10%,the initial temperature is 20~26℃,and the stearic acid dosage is 4%,nanometer calcium carbonate with a particle size of 50~90 nm,an oil absorption value of 23~27 g,and a specific surface area of 23~28 m^(2)/g can be prepared.The nano calcium carbonate is applied in DOP paste and silicone sealant for testing.Results show the thixotropic ring area is 10000~25000 Pa/s,the yield value is 100~200 Pa,the Bingham viscosity is 0.38~0.51 Pa·s,and the sag is≤2 mm.The performance meets the standard of GB 16776—2005“Structural silicon sealants for building”;when hydroxy stearic acid and carboxyl silane coupling agent are used as surface treatment agent,the thixotropic ring area is 28000~33000 Pa/s,yield value is 204~228 Pa,Bingham viscosity is 0.46~0.52 Pa·s,sag is 0 mm,and the thixotropy is better.

关 键 词：纳米碳酸钙 触变环面积 屈服值 宾汉黏度 下垂度 

分 类 号：TU57+8[建筑科学—建筑技术科学] TU502