胶水就是能够粘接二个物体的物质。胶水不是独立存在的，它必须涂在二个物体之间才能发挥粘接作用。胶水中的化学成分，在水性环境里。胶水中的高分子体（白胶中的醋酸乙烯是石油衍生物的一种）都是呈圆形粒子，一般粒子的半径是在0.5～5μm之间。物体的粘接，就是靠胶水中的高分子体间的拉力来实现的。在胶水中，水就是中高分子体的载体，水载着高分子体慢慢地浸入到物体的组织内。当胶水中的水分消失后，胶水中的高分子体就依靠相互间的拉力，将两个物体紧紧的结合在一起。在胶水的使用中，涂胶量过多就会使胶水中的高分子体相互拥挤在一起；高分子体间产生不了很好的拉力。高分子体相互拥挤，从而形成不了相互间最强的吸引力。同时，高分子体间的水分也不容易挥发掉。这就是为什么在粘接过程中"胶膜越厚，胶水的毡接效力就越差的原因"。涂胶量过多，胶水大起到的是"填充作用"而不是粘接作用，物体间的粘接靠的不是胶水的粘结力，而是胶水的"内聚力"。 如果不是水溶性的，其实原理也大同小异，就是用其他溶剂代替了水罢了。
Glue is able to bond two objects of the material. Glue does not exist independently, it must be painted between the two objects in order to play a bonding effect. The chemical composition of the glue in the water environment. The polymer in the glue (vinyl acetate in the gel is a kind of oil derivatives) are round particles, the general particle radius is between 0.5 ~ 5μm. The bonding of objects is achieved by the tension between the macromolecules in the glue. In the glue, the water is the medium of the polymer carrier, the water carrying the polymer slowly immersed in the organization of the object. When the moisture in the glue disappears, the polymer in the glue to rely on the tension between each other, the two objects tightly together. In the use of glue, the amount of glue will make too much glue in the polymer body crowded together; between the polymer body can not produce a good pull. Macromolecules are crowded with each other, and thus can not form the strongest attraction between each other. At the same time, the water between the polymer is not easy to volatilize. This is why in the bonding process, "the thicker the film, the glue on the poor the effectiveness of the reasons." Adhesion is too much, glue is a big "filling effect" rather than bonding, the adhesion between objects is not glue the glue, but glue the "cohesion." If not water-soluble, in fact, the principle is similar, that is, with other solvents instead of the water Bale.
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