摘要
以液体Na2 SiO3 、固体NaOH为原料制备结晶性层状硅酸钠 ,控制n(SiO2 ) /n(Na2 O) =1 82 0、煅烧温度 6 5 0 70 0℃、煅烧时间 10 30min ,样品参照QB176 8 93方法 ,在 35℃、交换 2 0min条件下 ,最大钙离子交换量 (以Ca CO3 计 )为 36 9mg/g ,最大镁离子交换量 (以MgCO3 计 )为 4 5 0 4mg/g。实验证明 ,结晶性层状硅酸钠可替代三聚磷酸钠 (STPP)用做洗涤剂除钙、镁助剂。同时 ,该样品在空气中平衡吸水增重量接近 30 % ,也可用做干燥剂。
The crystal layered sodium silicate is prepared using liquid Na 2SiO 3 and solid NaOH as raw material. When the ratio of reactants is controlled in the range of n(SiO 2)/n(Na 2O)=1 8~2 0 and calcination temperature 650~700℃ and calcination time 10~30min, the exchange is carried out with reference to QB1768 93 (enterprise standard) at 35℃ for 20 min, the obtained results show that the maximum exchange capacity of Ca +2 (CaCO 3) is 369 mg/g and the maximum exchange capacity of Mg +2 (MgCO 3) is 450 4mg/g It can be used as an alternative to STPP in detergent for stripping calcium and magnesium. At the same time the increment of balanced absorbing water reaches 30% of the sample weight in air so it can be used as drier. The acid resistance and solubility of crystal layered sodium silicate are studied in this article also.
出处
《精细与专用化学品》
CAS
2003年第24期16-18,21,共4页
Fine and Specialty Chemicals
