微硅粉表面处理对悬浮液体地膜流变特性的影响

Effect of Micro Silicon Powder Surface Treatment on Rheological Properties of Suspended Liquid Film

使用硅烷偶联剂KH-550对微硅粉进行表面改性,将改性后的微硅粉添加到液体地膜基料中,探究了硅烷改性微硅粉悬浮液体地膜在不同固含量、温度、偶联剂用量下的流变特性。实验结果表明,经硅烷偶联剂表面处理,微硅粉悬浮液体地膜流变性得到显著的提高,但悬浮液体地膜剪切变稀现象仍然存在,温度对其流变性能的影响不大。采用Casson模型拟合了悬浮体系的流变曲线,所得拟合参数与实验测定值吻合度较高,硅烷偶联剂的最佳用量在1.5wt%左右时,液体地膜体系分散稳定性最佳。最后在振幅扫描下测定悬浮体系的粘弹性,结果表明剪切应变γ增加到6%~10%时,悬浮体系表现为固体性质,γ超过6%~10%时表现为液体性质。

Silane coupling agent KH-550 was used to modify the surface of micro silicon powder,and the modified micro silicon powder was added to the liquid film substrate.The rheological properties of the micro silicon powder suspended liquid film were researched under different solid content,temperature and coupling agent dosage.The experimental results show that the rheological properties of the micro silica powder suspended liquid film are significantly improved by the surface treatment of the silane coupling agent,but the shear-thinning phenomenon of the suspended liquid film still exists,and the temperature has little effect on its rheological properties.The Casson model is used to fit the rheological curve of the suspension system,and the fitting parameters are in good agreement with the experimental values.The optimal dosage of the silane coupling agent is 1.5wt%,the dispersion stability of liquid film system is the best.Finally,the viscoelasticity of the suspension system is measured by amplitude scanning.When the shear strainγincreases to 6%-10%,the suspension system turns into solid property,and when the shear strainγexceeds 6%-10%,it turns into liquid property.