一种无机磷酸盐粘结剂干态覆膜砂的抗吸湿性试验研究

Experimental Study on Moisture Absorption Resistance of a Dry Coated Sand of Inorganic Phosphate Binder

通过氧化铜、DTPA、HEDP三种材料对粘结剂复合改性,并通过正交试验确定氧化铜、DTPA、HEDP的最优配比分别为2 g、4 g、12 g,也就是得到粘结剂34B6D2C1H6,所制试样相比于基液所制试样,在相对空气湿度50%RH以内存放120 h,抗吸湿性提升46.8%。再通过在制样时添加占粘结剂比例4%的辅料(98收尘镁砂粉),在相对空气湿度60%RH以内存放6 h,试样的抗吸湿性比没加辅料时提升70.5%。

In this paper,the binder was modified by the composite modification of copper oxide,DTPA and HEDP,and the optimal proportions of copper oxide,DTPA and HEDP were determined by orthogonal test to be 2 g,4 g and 12 g,respectively,that is,the binder 34B6D2C1H6 was obtained,and the sample was stored within 50%RH of relative air humidity for 120 h compared with the sample made by the base liquid,and the moisture absorption resistance was increased by 46.8%.By adding auxiliary materials accounting for 4%of the binder ratio(98 dust collection magnesia powder)during sample preparation,and storing them within 60%RH of relative air humidity for 6 h,the moisture absorption resistance of the sample is increased by 70.5%compared with that without auxiliary materials.