废纸脱墨浆生产线典型部位的浆料中细小组分所含黏性物质的分布调查和特性研究

摘要

对于脱墨浆生产线典型部位（热分散后、后浮选后和成浆池）取样分离的细小组分,采用四氢呋喃（THF）进行抽提。研究结果表明：从卸料塔到流浆箱,浆料中细小组分的THF抽出物降低了约35%。THF抽出物的傅里叶变换红外光谱（FTIR）分析表明：黏性物质中存在的成分包括饱和脂肪酸酯、聚醋酸乙烯类物质、丙烯酸类物质、含有Si—O键的有机硅化合物,以及少量的苯环邻位二取代物。将上述试样及成纸的THF抽出物进行气相色谱-质谱（GC-MS）分析,检测出的物质亦可归类于合成黏合剂成分、木材抽出物成分和木质素降解产物。可以看出,黏合剂类物质是细小组分THF抽出物的主要成分。%Fines fractions separated from pulps sampled from the major points of the DIP production line（after heat dispersion,after post-floatation and in the final chest） were extracted with tetrahydrofuran（THF）.The results showed that the THF-extractives reduced by about 35% in fines fraction for pulps from the dumping tower to the head box.FTIR analysis showed that the saturated fatty acid ester,polyvinyl acetates,acrylates,organic silicon compounds with Si—O bond and minor o-disubstituted of benzene were detected in the stickies of fines fractions THF-extractives in the samples mentioned above and final paper were analyzed by GC-MS,which showed that the detected substances could be categorized as synthesized adhesives,wood extractives and degraded lignin.Adhesives remained as major components in extractives for fines.