Study on the Effect of Organic Matter HPMC and PAM on the Properties of Phosphate No-Bake Sand
The effects of concentration and addition amount of hypromellose and polyacrylamide on the properties of no-bake sand were investigated,and the effect of the combined addition of the two accessories was discussed.The influence mechanism was preliminarily analyzed by SEM-ED Sand FTIR.The results show that the combined addition of 0.7%wt hypromellose aqueous solution accounted for 2%of the binder and 0.8%wt polyacrylamide aqueous solution accounted for 1%of the binder can effectively improve the dry strength and moisture resistance of no-bake sand.When the relative humidity is 40%-60%RH,the dry strength of the sand sample increases from 0.67 MPa to 0.97 MPa after hardening,and the average strength increases by 24.58%during 4 days of storage.When stored in the constant humidity box with 80%-85%RH for 4 days,the average strength increases by 43.27%,and the strength reduction rate decreased from 31.25%to 25.00%within 24-96 h.
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