造纸湿部系统胶黏物形成历程及原因  

Aggregation process and mechanism of pitch trouble in papermaking wet-end system

作　　者：陈晨[1] 苏文鹏[1] 戴红旗[1] 

机构地区：[1]南京林业大学轻工科学与工程学院,江苏省制浆造纸科学与技术重点实验室,南京210037

出　　处：《中华纸业》2015年第16期22-29,共8页China Pulp & Paper Industry

基　　金：国家自然科学基金项目(31270614);江苏省高校优势学科建设项目(PAPD)

摘　　要：以自制游离松香酸钠和硬脂酸钠模拟造纸湿部白水系统中胶体性阴离子物质(Colloidal Substances,简称CS)。通过与Ca2+反应前后溶液浊度、Zeta电位及胶黏物尺寸与形态的观测,系统研究CS在Ca2+作用下由游离态胶粒逐渐聚集发展为大颗粒黏性物质的历程及原因。结果表明,游离态C S在白水系统中积累到一定浓度后形成以憎水基为内核、亲水基为外层的胶束,其将与Ca2+发生离子交换,碰撞聚集生成黏性不溶物;或在结合Ca2+后继续结合游离CS的亲水基而构成以憎水基朝外的大胶体颗粒,并在此基础上依据相似相溶原理继续吸附游离CS的憎水基,如此层层吸附,逐步增长成宏观大尺寸的胶黏物。降低白水系统中脂肪酸类胶体物质的含量并控制Ca2+浓度小于5mmol/l有望防止黏性胶体聚集物的产生。In this study, the model compounds of soluble sodium resinate and sodium stearate were used to simulate the anionic colloidal substances （CS） concentrated in white water of papermaking wet-end system. The aggregation process and mechanism of CS from soluble colloidal particles to insoluble pitch trouble were investigated as a function of calcium ions concentration by measurement of turbidity, Zeta potential, particle size distribution and morphological observation. The results showed that the micelles with hydrophobic groups in the core and hydrophilic groups in the sheath can be formed when CS accumulated to a certain concentration in white water, the insoluble pitch trouble with high viscosity can be produced after micelles reacting with Ca2＋ and particle-particle collision; the micelles can also react with hydrophilic groups of other soluble colloids after their reaction with Ca2＋ and formed larger colloids with hydrophobic groups extending in the water, and then these hydrophobic groups can adsorb other hydrophobic groups of soluble colloids due to similar polarity, and so on produced insoluble and sticky pitch trouble with large size by “layer by layer”adsorption. The fatty acid content in white water should be reduced and the calcium ions concentration should be controlled under 5 mmol/l, which will expect to minimize the pitch trouble.

关 键 词：阴离子胶体物质 CA2+ 胶黏物 形成历程 形成机理 

分 类 号：TS714[轻工技术与工程—制浆造纸工程]