竹浆黑液高效减水剂与木质素磺酸钠的吸附行为对比

Comparison of Absorption Performance between GCL1-JB and SL

通过对比竹浆黑液高效减水剂(GCL1-JB)与木质素磺酸钠(SL)在固体平板上的吸附行为探究二者分散性能差异的原因。采用石英晶体微天平和逐层自组装技术研究GCL1-JB与SL的吸附行为,对比了GCL1-JB和SL在固体平板上的吸附量、吸附膜厚度、吸附层结构等。结果表明,相比于木质素磺酸钠,GCL1-JB的吸附量较多,吸附膜较厚,吸附层结构较致密,膜表面较平整光滑,吸附在水泥颗粒表面后的zeta电位较大。因此GCL1-JB有较强的空间位阻和静电排斥作用,导致GCL1-JB的分散性能优于木质素磺酸钠。研究有助于理解木质素基减水剂的分散机理,为木质素改性成减水剂提供理论基础。

Adsorption behavior and dispersion performance of lignin-type GCL1-JB and SL were investigated. The adsorption behavior of GCL1-JB and SL was studied by self-assembly technology and monitored by QCM-D technology. Adsorption capacity, adsorption film thickness and adsorption layer structure of GCL1-JB and SL on a solid substrate were compared. The experimental results show that GCL1-JB has higher adsorption capacity, thicker adsorption film, more compact adsorption layer, smoother film surface and higher zeta potential on the surface of cement particles. The steric and electrostatic repulsion among GCL1-JB particles are stronger than that of SL, which results in better dispersion performance of GCL1-JB than that of SL. This study shows importance in understanding dispersion behavior of lignin-based water reducing agents.