Advantages and Disadvantages of Powder Coatings and Coating Technology

coating and coating technology as a province of resources, energy conservation, low pollution and high labor productivity and get the attention of all countriesIn the 1970s, some even predicted that traditional coatings would gradually be replaced by powderHowever, more than 20 years of history have proved that, although powder coatings have many advantages, than other types of paint production growth faster, but it also has some shortcomings, so far in the total paint production accounted for less than 5%, the advantages of coating and coating technology
(1) powder coating does not contain organic solvents and water, organic solvent volatiles (VOC) equal to zero, not only save a lot of resources and avoid photochemical reactions and toxicity caused by air pollution, but also avoid wastewater treatment and other problems, is in line with environmental protection requirements of the more ideal paint varieties(2) avoids the hazards of organic solvents to the health of operators, and avoids the risk of fire in production, storage and transportation(3) in powder coating, powder coating in a closed system circulation, the powder can be recycled and reused, saving resourcesThe utilization rate of coatings is more than 95%, if the recycling equipment recovery efficiency is good, even up to 99%(4) in powder coating, coating thickness is easy to control, a coating thickness of up to 50-500UM (when applied cold spray, coating thickness 100UM), equivalent to solvent-based coating several to a dozen thickness, can reduce the number of coating, improve labor productivity, save energy consumptionIt also saves the site where the workpieces are stacked between each coating and waiting(5) powder coating resin sin has a larger molecular weight than solvent-based coatings, so the physical mechanical properties of coating film and chemical-resistant properties, better than solvent-based coatings(6) powder coating does not need very skilled operating technology, easy to master, coating film thick coating is not easy to produce such ills as hanging, the implementation of automated assembly line coating(7) paint is a powder state, do not need to be like solvent-based paint, with the season to adjust viscosity, also do not need to be sprayed after a period of time, so that the solvent volatile into the oven, can save time coatingIn the construction site, can greatly reduce the assembly parts of the stacking siteii, powder coating and coating technology shortcomings
(1) the manufacturing of powder coating equipment requirements are higher, than solvent-based or water-based coating equipment is much more sophisticated, theresulting in this is also higher (2) because of the complexity of equipment, precision, powder coating situised with multiple varieties, multi-color rotation production, changing varieties, changing colors is more difficult (3) powder coating equipment needs to install powder coating recovery device, not as simple as solvent-based paint construction , but also to consider the prevention of dust explosion and other issues, equipment investment is larger (4) powder coating resin softening point is generally above 85 degrees C, in the process of manufacturing powder coating, the melting extrusion temperature is relatively soft point high 10 degrees C, when coating melt inglicing leveling temperature should be at least 30-40 degrees C above the softening point, This , powder coating baking temperature is mostly above 150 degrees C, baking temperature is high, not suitable for poor heat resistance of plastics, wood, paper and other substrates coating, also not suitable for solder parts, electronic components and other non-heat-resistant items coating (5) due to coating equipment and baking temperature and other issues, the original coating solvent-based or water-based paint coating equipment or coating lines can not be directly used for coating powder coating powder coating and solvent-based solvent coating characteristics can be found in table 1-16 table 1-16 powder coating and solvent-based coating characteristics
project powder coating and coating solvent-based coating a coating film thickness / UM50-50010-30 thin coating difficult thick coating easy coating line automation easy to spray paint recovery can not be project powder coating and coating solvent-based With coating coating film performance is good general the air pollution brought by the solvent does not have the risk of fire brought by the solvent is not the toxicity of the solvent does not have dust pollution there is no, but not without the dust explosion problem, but not without the coating labor production efficiency is high general special coating equipment need not skilled production operation technology need not paint color change and trouble simple the waste of solvent
swass The convenience of coating transportation is convenient and convenient
the storage of paint is more convenient and inconvenient