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添加分散剂可改善聚丙烯酰胺(poly acrylamide,PAM)/蒙脱土(montmorillonite,MMT)复合导水涂层材料制备过程中悬浮液浓度比例不均衡问题。该文研究添加分散剂聚乙烯吡咯烷酮(polyvinyl pyrrolidone,PVP)、聚乙烯醇(polyvinyl alcohol,PVA)、十二烷基硫酸钠(sodium dodecyl sulfate,SDS)对导水涂层材料性能的影响。通过扫描电镜对流挂纤维束的成膜性、涂层的微观形貌结构进行分析;采用热分析仪及质量法分析材料的吸脱附水特征;利用红外光谱仪对材料的化学成分进行分析。结果表明:对于PAM与MMT质量比为1:10的复合导水涂层材料,加入与PAM质量比为1:0.20的分散剂PVA后其成膜性最好;3种分散剂均改善了MMT的分散性;该材料吸脱附水能力为PAM/MMT/SDS>PAM/MMT>PAM/MMT/PVP>PAM/MMT/PVA复合材料,在约110 min时PAM/MMT/SDS材料的吸水率可达14 g/g,在100 min时其放湿量可达2.08 g/g;由复合材料的红外光谱分析可知并无新的物质生成,蒙脱土颗粒粘附在PAM和分散剂复合物内部网络结构支架上。该研究可为后续复合导水涂层材料成分比例精确选择提供参考。
The addition of dispersant can improve the imbalance of the suspension concentration in the process of preparation of polyacrylamide (PAM) / montmorillonite (MMT) composite water-conducting coating material. In this paper, the effects of adding polyvinyl pyrrolidone (PVP), polyvinyl alcohol (PVA) and sodium dodecyl sulfate (SDS) on the performance of water-conducting coating materials were studied. Scanning electron microscopy (SEM) was used to analyze the film-forming property of the wound fiber bundles and the microstructure of the coating. Thermal analysis and mass spectrometry were used to analyze the adsorption and desorption characteristics of the materials. The chemical composition of the materials was analyzed by infrared spectroscopy. The results showed that the best film-forming property was obtained when the mass ratio of PAM to MMT was 1:10 and the mass ratio of PVA to PAM was 1: 0.20. All the three dispersants improved the MMT The water absorption capacity of PAM / MMT / SDS was about 0.01 min. The water absorption capacity of PAM / MMT / SDS was lower than that of PAM / MMT / SDS> PAM / MMT> PAM / MMT / PVP> Up to 14 g / g, and the amount of moisture desorption can reach 2.08 g / g at 100 min. From the infrared spectrum analysis of the composite material, no new material is formed, and the montmorillonite particles adhere to the PAM and dispersant complex Internal network structure on the bracket. This study can provide a reference for the precise selection of composition ratio of the subsequent composite water-conducting coating materials.