Common knowledge of coating: causes of bubbles and pinholes during spraying construction and elimination methods

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, it will break through the surface layer of the coating and form bubbles This and Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 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 surface drying speed of the coating is slightly higher than that of the interior, when the surface has started to condense and the interior solvent or air is still evaporating, it will break through the surface of the coating and form bubbles, which is related to the following situations: the viscosity of the coating is too high, the thickness of the coating is once applied, and the 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,