The Surface of Enameled Wire Should be Clean When It be Painted
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Hydration Mercury droplets shrink on the glass plate into an oval shape, and the water droplets spread on the glass plate to form a thin layer with a central convexity. The former is a moist phenomenon and the latter is a non-wetting phenomenon. Wetting phenomenon is a manifestation of the force of the molecules. If the attraction between the liquid molecules is less than the attraction between the liquid and the solid, the liquid will wet the solids, and the liquid will be evenly coated on the solid surface; if the liquid molecules The gravitational force between the liquid and the solids is greater than the gravitational force, the liquid will not be able to wet the solids, and the liquid will shrink into a mass when coated on the solid surface. All of the liquids each wet certain solids and not wet other solids. The angle between the tangent of the liquid surface and the tangent of the solid surface is called the contact angle, the contact angle is less than 90°liquid wet solid, and the liquid non-wetting solid is greater than or equal to 90°.
If the surface of the enameled copper wire is bright and clean, a layer of paint can be applied. If the surface is stained with oil, the contact angle between the enameled wire and the paint interface is affected, and the paint solution turns the enameled wire from wet to non-wet. If the copper wire is hard, the irregular arrangement of crystal lattices on the surface molecules will have less attraction to the paint, which is not conducive to the wetting of the copper wire by the paint solution.
The phenomenon of capillary phenomenon of moistening the wall of the pipe rises in the pipe, and the phenomenon of the non-wetting pipe wall of liquid falling in the pipe is called a capillary phenomenon. This is due to the effect of wetting phenomena and surface tension. Felt painting is the use of capillary phenomena. In the case of a liquid-wet tube wall, the liquid rises along the wall of the tube to form a concave surface, which increases the surface area of the liquid, and the surface tension causes the surface of the liquid to shrink to a minimum. Under this force, the liquid level tends to be horizontal, and the tube The fluid in the tube stops rising as the liquid rises until the wet and surface tension pulls upward and the weight of the rising liquid column in the tube reaches equilibrium. The finer the capillary, the smaller the specific gravity of the liquid, the smaller the wet contact angle, the greater the surface tension, and the higher the liquid level in the capillary, the more pronounced the capillary phenomenon.
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