Common knowledge of coating: causes of bubbles and pinholes in spraying construction and how to solve them

Core tip: phenomenon: a lot of small bubbles appear on the surface of the coating at first, and then the bubbles break or break when the paint film is abraded, forming a dense pinhole like hole Cause: there are gases (solvent vapor, water vapor, expanded air or other gases that can be mixed into the paint, such as carbon dioxide, etc.) in the coating to break through the coating and form bubbles, and then break or wear to form pinholes When the dry speed of the surface layer is slightly higher than that of the interior layer, when the surface layer has started to condense and the interior solvent or air is still evaporating, the surface layer of the coating will break through and form bubbles Paint knowledge | precautions for wall paint color selection Recommended introduction: when painting the wall, the owner sometimes has difficulty in choosing what color of the wall paint to paint In fact, there is no ugly color in the wall paint, only the disharmonious color matching The use of wall color contains the knowledge of health Too strong color will stimulate people's perception, make people have a sense of fidgety, affect people's mental health Grasp the basic principles of wall color and paint a colorful space 1、 Wall paint color selection notice 1 Light color is generally used for the top surface Light colors make people feel light, dark colors make people feel heavy Usually, the treatment of rooms is from top to bottom, from shallow to deep For example, the ceiling and walls of rooms are white and Paint Home News: phenomenon: in the coating surface there are many little bubbles, and then the bubbles break or in the paint film grinding when the formation of dense pinhole like small holes Cause: there are gases (solvent vapor, water vapor, expanded air or other gases that can be mixed into the paint, such as carbon dioxide, etc.) in the coating to break through the coating and form bubbles, and then break or wear to form pinholes When the dry speed of the surface layer is slightly higher than that of the interior layer, when the surface layer has started to condense and the interior solvent or air is still evaporating, the surface layer of the coating will break through and form bubbles This is related to the following conditions: too high viscosity of paint, one-time coating thickness, wood The conduit is thick and deep, the filling hole is not filled with air; the spraying air pressure is too high, too much air is mixed in the paint; the oil, dust, sweat and so on are attached to the surface to be coated, and the water around these unclean objects gathers; the temperature difference between the paint and the surface to be coated is too large; the diluent is not used properly, the curing agent is added excessively or the wrong curing agent is used; the coating environment temperature is too high or the relative humidity is too high; the lower coating is dry If the coating is not completely dry, the upper coating shall be applied and dried rapidly; if the coating is dried by heating, the temperature is too high, the time for the coating to stand before heating is not enough, the solvent is not fully volatilized, the paint itself brings bubbles, and the bubbles generated during mixing are not eliminated, etc Troubleshooting: check the coating process conditions for the above reasons, adjust the appropriate viscosity of the coating, match appropriate amount of diluent and curing agent, and control the thickness of the coating; do well in filling holes and sanding of the base material to eliminate the pollution of the base material; adjust the appropriate air pressure to reduce the air mixing; improve the working environment, control the appropriate temperature and humidity; properly lengthen the recoating time to make the lower layer The paint should be allowed to stand for 20 minutes and then be sprayed When the coating is heated and dried, the time of standing should be controlled to make the solvent volatilize sufficiently and then the coating should be preheated Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,