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首页> 外文学位 >Investigating the mechanism of paper sizing through a desizing approach and a new approach to rosin sizing without mordants.
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Investigating the mechanism of paper sizing through a desizing approach and a new approach to rosin sizing without mordants.

机译：通过退浆方法和无媒质松香上浆的新方法来研究上浆的机理。

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A series of chemical penetrants are employed to investigate the chemical characteristics of size bonds in different sizing systems. The bonding strength has been proved to be determined by the type of bonding. In rosin-alum size the size bond is an indirect coordinate bond, which is vulnerable to the attack by acid, alkaline and especially by aluminum-affinited ligands, in which ligand substitutions take place and determine the rate of ink penetration in the Hercules Size Test (HST) test. Alkyl Ketene Dimer (AKD) can react with cellulose to form a direct {dollar}beta{dollar}-keto ester bond. This covalent bond is strong enough to resist the attack of acid or alkaline and is almost inert to these chemicals. However, if a small amount of alum is used in AKD sizing, there will be two types of size bond existed in the acid condition. Therefore, different HST values will be observed depending on what ink is used. A hypothesized mechanism about ligand substitution has been proposed and verified indirectly. This simple desizing approach provides important information on sizing mechanisms and will benefit new sizing agent research.; As a new approach to rosin soap sizing, it was found that dipping handsheets in the rosin soap solution and drying the sheets at elevated temperatures could induce effective sizing on different pulps. No mordant (alum) is needed in this process. The pH of the dipping solution seems to have little effect on the sizing result. Some desizing inks with strong effects on conventional rosin soap sized paper were found to have little desizing effect on these type of handsheets. These facts strongly indicate that covalent ester linkages could be the bonds that form between rosin molecules and fibers in this process. The dry schedule, heat temperature, and the concentration of dipping solution have shown various effects on the sizing results depending on the types of pulp used. Completely understanding the sizing mechanism and making this process commercial is well worth additional research work. This method, however, suffers from its speed of fugitiveness.
机译：一系列化学渗透剂用于研究不同胶料体系中胶粘剂的化学特性。已经证明结合强度由结合的类型决定。在松香铝胶中，胶体键是间接配位键，易受酸，碱，尤其是铝限定的配体的攻击，在配体中发生配体取代并确定墨水的渗透速度（HST）测试。烷基酮二聚体（AKD）可以与纤维素反应，形成直接的{beta}β{dollar}-酮酸酯键。该共价键强度足以抵抗酸或碱的侵蚀，并且对这些化学物质几乎呈惰性。但是，如果在AKD上浆中使用少量明矾，则在酸性条件下将存在两种尺寸键。因此，根据使用哪种墨水，将观察到不同的HST值。提出了关于配体取代的假设机制，并间接进行了验证。这种简单的退浆方法可提供有关上浆机理的重要信息，并将有助于新的上浆剂研究。作为松香皂浆上浆的一种新方法，发现将手抄纸浸入松香皂液中并在高温下干燥，可以在不同的纸浆上产生有效的上浆效果。在此过程中不需要媒人（alum）。浸渍溶液的pH似乎对施胶结果几乎没有影响。发现对常规松香皂浆纸有强烈影响的一些退浆油墨对这些类型的手抄纸几乎没有退浆作用。这些事实强烈表明，在此过程中，共价酯键可能是松香分子与纤维之间形成的键。干燥时间表，加热温度和浸渍溶液的浓度已显示出对上浆结果的各种影响，具体取决于所用纸浆的类型。完全了解大小调整机制并使此过程商业化非常值得进行其他研究工作。然而，该方法具有逃犯速度。

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