梳型聚合物超分散剂的合成及其在有机介质中分散CaCO_3的研究

Synthesis of Comb-Like Copolymer Dispersant for Dispersing CaCO_3 in Organic Medium

设计合成了一种新型梳型聚合物SMA-g-PSHD,用于在有机介质中分散超细碳酸钙。该梳型聚合物分别以羧基为锚固基团,低极性聚酯PSHD为溶剂化链。通过FT-IR、1 H-NMR和凝胶渗透色谱(GPC)对梳型聚合物的结构、组成和分子量进行表征,并且系统地研究了SMA-gPSHD对CaCO_3在有机介质中的分散性、悬浮液流变行为和稳定性的影响,结果表明:梳型聚合物明显改善了CaCO_3的分散性,使其在有机介质中几乎呈单颗粒分布;悬浮液黏度显著降低,并且呈近牛顿流体特征;SMA-g-PSHD改性后的悬浮液具有极佳的稳定性。

A novel comb-like poly(styrene-co-maleic anhydride)-graft-poly(stearyl alcohol-cohexanediol-co-decanedioic acid)(SMA-g-PSHD)was designed and synthesized,which was used as the surface modifier for dispersing CaCO_3 in organic medium.The comb-like copolymer was absorbed on the surface of CaCO_3 using the anionic polycarboxylate as binding group while dispersed in organic medium using the low polarity PSHD polyester side chains.The structure,composition and molecular weight of SMA-g-PSHD were determined by FT-IR,1 H-NMR and GPC,respectively.The dispersion ability of CaCO_3 in organic medium,the rheological behavior and stability of CaCO_3 suspension using SMA-g-PSHD as the dispersant were investigated systematically.The results showed that the addition of SMA-g-PSHD improved the dispersion ability of CaCO_3 in xylene significantly and decreased the apparent viscosity of CaCO_3 suspension dramatically who behaved near Newton fluid.In addition,the SMA-g-PSHD modified suspension showed superior stability.