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The main ingredient of glue.

Update:23 May 2018
Summary:

The viscosity of the glue is measured with a Brookfield […]

The viscosity of the glue is measured with a Brookfield viscometer in "cps centipo". The viscosity reading of the glue is generally between 300 and 30000 cps. In a water-soluble binder, the solids content does not determine the viscosity of the gum, but rather the plasticizer, tackifier, etc., within the glue formulation affects the viscosity value of the glue. Under normal circumstances, the higher the surrounding ambient temperature is, the "viscosity ↓" and the "temperature ↓ viscosity ↑". The viscosity of water at 27°C is "1". Adhesion principle of water-soluble glue: Chemical composition in glue, in water-based environment.
The polymer in the glue (vinyl acetate in the white glue is a kind of petroleum derivative) is all round particles, and the general particle radius is between 0.5 and 5 μm. The adhesion of an object is achieved by the tension between the polymer in the glue . In glue, water is the medium polymer carrier, and water carries the polymer slowly into the tissue of the object. When the water in the glue disappears, the polymer in the glue relies on the pulling force of the two to bind the two objects tightly together. In the use of glue, too much glue will cause the polymer in the glue to be crowded with each other; the polymer will not produce good tension. Polymers are crowded with each other and cannot form the strongest attraction between them. At the same time, the moisture between the polymers is not easily volatilized. This is the reason why the thicker the glue film is, the worse the felt felting efficiency of the glue is. Excessive amount of glue, glue played a large "filling" instead of bonding, bonding between objects is not relying on the adhesive force of the glue, but the glue "inside.