胶黏物模型物在抄造系统中的稳定特性研究

Study of the Stability Characteristics of the Stickies Model Compounds in Papermaking System

关键词:  微细胶黏物  模型物  稳定特性

Key Words:microstickies  model compounds  stability characteristics

摘要:选取造纸常用的施胶剂烷基烯酮二聚体（AKD）和涂布胶黏剂羧基丁苯胶乳（XSBRL）作为抄造白水微细胶黏物模型物，就其在液相中的稳定特性进行研究分析。采用红外光谱（FT-IR）、扫描电镜（SEM）对AKD和XSBRL进行表征，通过示差扫描量热法（DSC）和热重法（TG）对其热性能进行分析，运用激光探测技术、流式技术以及荧光示踪技术相结合的方法，就抄造系统的有关参数对模型物粒径分布的影响进行研究。结果表明，相对于常温时的玻璃态，两种模型物在抄造系统常见温度范围内均处于发黏、高弹态，颗粒间发生聚集，其中，XSBRL对温度更为敏感，聚集程度比AKD的要高，并且随着系统温度的升高，两模型物的聚集趋势都略有上升；当系统温度保持在50℃时，两模型物的聚集状态都随时间延续略有增加，但随时间延续，变化幅度不大；机械搅拌作用的影响与其作用的强度有关，搅拌速度高于800 r/min时，两模型物颗粒间由轻微的聚集趋势转变为分散趋势。

Abstract:The common sizing agent, alkylketene dimer (AKD), and the coating binder carboxylated styrene-butadiene latex (XSBRL), were taken as model compounds of microstickies in whitewater to investigate their stability characteristics in the liquid phase. The basic characteristics of AKD and XSBRL were characterized by Infrared Spectrometric Analyzer (FT-IR) and Scanning Electron Microscopy (SEM), and the thermal properties were analyzed through differential scanning calorimetry (DSC) and thermogravimetry (TG). Furthermore, the effects of the conditions of papermaking system on the change of the particle size distribution were investigated by using a method combining laser, flow cytometric technology and fluorescent tracers. The results showed that both of the two model compounds were sticky and in high elastic state in the temperature range of papermaking system compared with in glass state at room temperature, which induced the aggregation among particles. XSBRL was more sensitive to temperature and its aggregation degree was higher than AKD’s. With the temperature increasing, the aggregation tendencies of these two model compounds were slightly increased. When the system temperature was kept at 50℃, the aggregation state of the two model compounds increased slightly and changed marginally with time went on. The effect of mechanical agitation on the particle size distribution of the two model compounds was related to the strength of agitation. The particles of the two model compounds didn’t slightly aggregate anymore and tended to disperse when the stirring speed exceeded 800 r/min.