Coating technology: specific operation method for leveling of powder coating

It is pointed out that powder coating has become one of the most environmentally friendly coating systems due to its low VOC emission during curing due to its complete absence of organic solvents The so-called leveling property of coating refers to the smooth and flat state of coating after coating construction The surface with good leveling property shall be free of orange peel, brush mark, ripple, shrinkage cavity and other irregular forms Generally, the method of direct observation with naked eyes is to compare the sample and standard sample in parallel to judge the film leveling This method varies from person to person and has strong subjectivity Application of wavelength scanning method in automobile industry Application scope and advantages of roller ceramic coating Recommended introduction: the surface of ceramic rubber plate used for roller ceramic coating is cast into durable rubber plate by hundreds of independent small ceramic pieces Each ceramic piece has raised characteristics Under general conveyor belt pressure, thousands of unique cast bumps can produce positive traction, prevent slipping and extend the service life of conveyor belt roller At the same time, the bottom layer adopts high-quality rubber, which has strong elasticity and can play a good impact resistance role The scope of application of roller ceramic coating is one three six 83857180 (the same as V) 1 Roller coating in extremely harsh working environment 2 The belt joint is not suitable for fixing with iron buckle; 3 It is suitable for leather Paint House News: powder paint has become one of the most environmentally friendly paint systems due to its low VOC emission during curing due to its complete absence of organic solvents The so-called leveling property of coating refers to the smooth and flat state of coating after coating construction The surface with good leveling property shall be free of orange peel, brush mark, ripple, shrinkage cavity and other irregular forms Generally, the method of direct observation with naked eyes is to compare the sample and standard sample in parallel to judge the film leveling This method varies from person to person and has strong subjectivity The wavelength scanning method applied in the automobile industry to characterize the surface state of the coating has a semi quantitative effect The long wave (10-0.6mm) and short wave (0.6-0.1mm) are used for scanning, and the measurement value is between 0-100 The lower the value is, the smoother the coating surface is, the better the leveling performance There are three main factors that affect the leveling property of powder coatings One is leveling agent Add proper leveling agent in the formulation of powder coatings, such as gl588 of Nanhai company, H98 of Laisi company, pv88 of worlee Chemie company, etc when the powder coatings are melted, these agents can rapidly reduce the surface tension of the coatings, promote the rapid flow and elimination of the coatings before curing and film formation In addition to or reduce surface defects such as orange peel, brush mark, ripple, shrinkage cavity, etc.; the second is the melt viscosity of powder coating For thermosetting powder coating, in the process of melt flow, with the crosslinking curing reaction, the higher the temperature is, the faster the curing reaction is, the faster the viscosity of the system rises, the shorter the flow time, and the liquidity is restricted Therefore, the melt viscosity of the powder coating can not accurately reflect the final leveling of the coating film, and the influence of baking process, heating rate, crosslinking and curing temperature on the leveling of the coating film must be considered at the same time; third, baking process There is a heating up process in the baking of powder coatings, and the speed of heating up has a considerable influence on the leveling of coatings The trend of dynamic viscosity changing with temperature is basically the same, that is to say, viscosity decreases with the increase of temperature at the beginning and reaches the minimum value, and then increases with the increase of temperature, which is caused by the cross-linking reaction More importantly, the faster the heating rate is, the smaller the minimum viscosity value is, and the higher the corresponding temperature is, the better the curing and leveling of the film is The leveling property of powder coating is restricted by leveling agent, film-forming resin structure and curing mechanism With proper leveling agent, low melt viscosity resin system and matching curing process (UV curing), the film with excellent leveling performance can be obtained 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,