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The principle of the role of adhesive?

The principle of the role of adhesive?

Answer:

If not water-soluble, in fact, the principle is similar, that is, with other solvents instead of the water Bale.
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."
The viscosity of the glue is measured with a Brookfield viscometer in units of "cps centipoise". The viscosity of the glue is usually between 300 and 30000 cps. In water-soluble binders, the solids content does not determine the viscosity of the gel, but rather the plasticizer, tackifier, etc. in the formulation of the glue, which affects the viscosity of the glue. Under normal circumstances the ambient temperature is higher "viscosity ↓", "temperature ↓ viscosity ↑". The viscosity of water at 27 ° C is "1".
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.

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