离子交换树脂：

      离子交换法(ion exchange process)是液相中的离子和固相中离子间所进行的一种可逆性化学反应，当液相中的某些离子较为离子交换固体所喜好时，便会被离子交换固体吸附，为维持水溶液的电中性，所以离子交换固体必须释出等价离子回溶液中。阳离子交换树脂离子交换树脂一般呈现多孔状或颗粒状，其大小约为0.5~1.0mm，其离子交换能力依其交换能力特征可分:

     1、强酸型阳离子交换树脂:主要含有强酸性的反应基如磺酸基(-SO3H)，此离子交换树脂可以交换所有的阳离子。

     2、弱酸型阳离子交换树脂:具有较弱的反应基如羧基(-COOH基)，此离子交换树脂仅可交换弱碱中的阳离子如Ca2+、Mg2+，对于强碱中的离子如Na+、K+等无法进行交换。

阳离子树脂是以苯乙烯和二乙烯苯聚合， 经硫酸磺化而制得的聚合物。 生产过程中不含有明 胶及其它任何动物提取物。阳离子交换树脂遇水可将其本身的某一种具有活性的离子和水中某电离子相互交换，即发生置换反应，去除水中可溶解的离子。阳离子交换树脂有粉状和球状，都是人工合成的。

Ion exchange method, ion exchange process) is the ions in liquid phase and solid phase of a reversible chemical reaction between ion, when something in the liquid phase is relatively ion exchange solid ions have be fond of, will be solid adsorption, ion exchange and to maintain a neutral aqueous solution, so ion exchange solid must release the equivalent ion in the solution back. Cation exchange resin of ion exchange resin generally present cellular or granular, its size is about 0.5 ~ 1.0 mm, the ion exchange capacity according to its characteristics of exchange capacity can be divided into:

1, strong acid type cation exchange resin: mainly contains reaction of strong acid such as sulfonic group (- SO3H), this can exchange some cation ion exchange resin.

Type 2, weak acid cation exchange resin, with weaker reaction such as carboxyl (- COOH), the ion exchange resin can be exchanged only in the weak base cations such as Ca2 +, magnesium 2 +, the alkali ions such as Na +, K + cannot be exchanged.

Cationic resin by styrene and divinyl benzene polymerization, the sulfonated polymer made by sulfate. The production process does not contain gum and any other animal extracts. Cation exchange resin in water itself can be one of the active ions and the water electric ion exchange, namely substitution reaction, remove the water soluble ions. Cation exchange resin with powder and ball, are synthetic.