论文部分内容阅读
在实际生产中,碱性抄纸时使用AKD施胶剂会带来一些问题,如施胶剂过量消耗,填料对施胶剂施胶效果产生不良影响,纸机运行过程中的回水污染、留着率降低和树脂沉积等。此外,某些AKD施胶纸会随时间的延长而丧失施胶性能,引起纸张打滑。为了更好地了解AKD施胶,利用毛细管气相色谱(GC)研究了纸张中AKD的留着和反应机理。在不同的AKD用量下,用中试纸机抄造出若干纸样,抽提后用GC分析了湿纸张和机制干燥纸中AKD的含量。结果表明,加填PCC能够提高AKD的留着率,随干燥的进行,湿纸张中的结合AKD含量明显增加,而结合AKD只占纸张中留着的AKD总量的一小部分。通常认为纸张的施胶度由结合AKD提供,这意味着即使加入少量的AKD,若其能与纤维间形成化学键连接,也能够保证纸张具有足够的施胶度。
In actual production, alkaline papermaking using AKD sizing agent will bring some problems, such as excessive consumption of sizing agent, sizing agent filler effect adversely affected, the paper machine running backwater pollution, Retention rate and resin deposition and so on. In addition, some AKD sizing papers lose sizing performance over time, causing paper slippage. In order to better understand AKD sizing, the retention and reaction mechanism of AKD in paper was investigated by capillary gas chromatography (GC). At different amounts of AKD, a number of paper samples were made in a pilot paper machine and analyzed by GC for the content of AKD in the wet paper and the dry paper after the extraction. The results showed that addition of PCC increased the retention of AKD, and as the drying progressed, the combined AKD content in the wet paper increased significantly, whereas the combined AKD only accounted for a small fraction of the total AKD retained in the paper. The degree of sizing of the paper is generally considered to be provided by the combination of AKDs, which means that even if a small amount of AKD is added, it is possible to ensure sufficient sizing of the paper if it is chemically bonded to the fibers.