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蓝黑墨水中的化学成分较多,通常有十来个组分。这些成分在性能和作用上各有特点,既互为补充,又相互制约。其中稳定剂硫酸对变黑成分——鞣酸、没食子酸和硫酸亚铁的稳定作用(实质上是对亚铁离子Fe~(++)鞣酸根以及没食子酸根的稳定作用),就是最典型的例子。 本文拟以硫酸的稳定性为线索,来说明与蓝黑墨水的耐久性有关的一些问题。 一、与变黑色素成分相关的多种化学平衡 在变黑色素成分的水溶液中,主要存在着以下四种类型的化学平衡: 1、电离平衡。变黑持久成分中的各个组分,以及溶剂水都是电解质。其中,FeSO_4是强电解质,在水溶液中完全电离,而没食子酸、鞣酸以及水,都是弱电解质,只能部分电离,从而形成弱电解质的(可逆)电离平衡,例如:
Blue ink more chemical composition, usually more than a dozen components. These components have their own characteristics and functions, both complement each other and restrict each other. Among them, the stabilizing effect of the stabilizer sulfuric acid on the blackening components - tannic acid, gallic acid and ferrous sulfate (which is essentially the stabilizing effect on ferrous ion Fe ~ (++) tannate and gallates) is the most typical example. This article intends to clues to the stability of sulfuric acid to illustrate some issues related to the durability of blue-black inks. First, with a variety of melanin-related chemical composition of a variety of chemical compounds in the melanin aqueous solution, the main existence of the following four types of chemical equilibrium: 1, ionization equilibrium. Each of the components of the dull, long lasting component, and the solvent water are electrolytes. Among them, FeSO_4 is a strong electrolyte and completely ionized in aqueous solution. Gallic acid, tannic acid and water are weak electrolytes and can only partially ionize to form a (reversible) ionization equilibrium of weak electrolytes. For example,