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[Chemical Knowledge]：What is adhesion? -- Master the adhesion between objects

Read： 390 Time：18months ago Source：Transform the World with Simplicity

Adhesion refers to the adhesion between two objects under the action of force, which is divided into adsorption force and adhesion force. The size of the adhesion between the object and the object is not only related to the physical and chemical properties of the surface material of the object, but also related to the size, shape, surface state and other parameters of the gap between the two objects.

adhesion is widely used in daily life. For example, when writing, we call the combination of paper and pen adhesion. In another example, when using a magnet to adsorb an item, we call it adsorption force. In industrial production, glue is often used to stick two objects together to obtain glued items. Among them, it also fully embodies the application of adhesion. Whether in industrial production or daily life, adhesion is irreplaceable.

and if we want to play in adhesion, we must have an understanding of adhesion.

1. adsorption force

adsorption force is due to the magnetic field force, electrostatic force, etc. generated between objects, especially the adsorption force is the most typical, that is, magnetic attraction force. The adsorption force is related to the surface roughness and surface area of the object. For example, for a magnet of the same size, the larger the surface area of the magnet, the greater the adsorption force, and the smaller the surface roughness of the magnet, the greater the adsorption force.

2. Adhesion

Adhesion includes adhesion and cohesion. "Adhesion" refers to the intermolecular force between objects, and the adhesion of objects is due to the existence of surface viscosity. The "cohesion" is the adhesion of objects that are easy to liquefy, which can be regarded as the accumulation of multiple adhesion phenomena. For example, special glue can establish a strong adhesive relationship between two rigid objects at an accurate temperature.

3. surface treatment method

in industrial production, due to the imperfect process conditions of raw material preparation, the surface state of the object does not meet the requirements of use, without affecting the quality of the premise, we can take some technical means, that is, the use of surface treatment method, change the surface state of the object, so as to improve the adhesion of the object. Such as iron parts surface treatment, sand blasting and other common methods.

Through the understanding of adhesion, we can better meet the requirements of industrial production and daily life. In the process, the measurement of adhesion is very necessary, and higher requirements are put forward for the selection, application and storage of adhesive materials.

in today's scientific and technological progress, the research and development of adhesion is constantly innovating and expanding the application scope of adhesion. In the future development, the application of adhesion will be increasingly extensive.