Coating classification: low odor UV curable wood coating

Core tip: Product Introduction: In recent years, UV curable coatings have been widely used in the field of wood furniture and doors, and will be favored by more and more furniture and door enterprises in the next few years The rapid increase of UV coating production of furniture and wooden doors indicates that UV curing coating will be a rapid development in the whole wood products industry Low odor UV curable coating is made by combining the test items and standard limits, reach regulations and production practices in the EU ROHS directive, and doing a lot of technical research and development work for furniture (UV) UV curable coating Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form It is a new type of coating, because of its own advantages and more and more known by people Let's introduce Akzo Nobel Powder coating Akzo Nobel Powder coating is a cost-effective coating solution, which can be applied to different kinds of products After the treatment of static electricity and fire baking, a tough and durable coating surface will be formed, with the least impact on the environment Since the introduction of this technology, powder coating has been able to continue to maintain the Paint Home News: Product Introduction: in recent years, UV curable paint has been widely used in the field of wood furniture and wood doors, and will be favored by more and more furniture and wood door enterprises in the next few years The rapid increase of UV coating production of furniture and wooden doors indicates that UV curing coating will be a rapid development in the whole wood products industry Low odor UV curable coating is made by combining the test items and standard limits, reach regulations and production practices in the EU ROHS directive, and doing a lot of technical research and development work for furniture (UV) UV curable coating Principle of low odor: photoinitiator is the key component of UV coating Its function is to transfer the energy of UV photons, quickly initiate the crosslinking polymerization of monomers and oligomers, and promote the liquid-solid conversion process of the system According to the initiation mechanism, photoinitiators can be divided into free radicals and cations UV can be divided into: vacuum UV (wavelength 10-200nm), short wave UV (UV-C, wavelength 200-290nm), medium wave UV (UV-B, wavelength 290-320nm), long wave UV (UV-A, wavelength 320-400nm), visible light (wavelength 400-760nm) Ultraviolet (UV) is used in industrial production Long wave UV (UV-A) is generally used in the world The traditional 1173 and 184 initiators will be blocked in the absorption range of this wavelength without being triggered by absorption Therefore, it is necessary to select different photoinitiators according to different coating formulations At the same time, combined with the test data of the raw material manufacturers, the regular understanding is summarized, forming a mechanism of benzene production in the formula and curing process of compounds Some compounds contain benzene before the sunlight, which does not increase after the sunlight, indicating that benzene is caused by the residual pollution in the manufacturing process If benzene is used as the raw material, it is difficult to completely remove it Some compounds do not contain benzene before light exposure, but the benzene content increases after light exposure, which indicates that the compounds are unstable under light and will decompose into free benzene molecules Some photoinitiators produce volatile fragments after illumination, causing odor and toxicity The content of 6022 photoinitiator is up to the standard Ingredients: 1) the oligomer of epoxy acrylate and aromatic polyurethane acrylate has better adhesion and heat stability; 2) the monomer of ethoxylation and the wettability of hydroxyethyl methacrylate are also optimistic; 3) Select the functional products with benzene content less than 0.01mg/m2 before and after coating construction; 4) adjust the construction viscosity according to different construction processes (spraying, roller coating and spray coating) of different substrates Production process: substrate treatment: degreasing and dedusting treatment must be carried out before going online (isopropanol is preferred) Construction process: 1) static electricity removal: use ion gun to remove static electricity and surface dust 2) Spraying: the diameter of spray gun is 1.5-2.0mm, the pressure of compressed air is about 6kgf / 2, and the thickness is 10-20um; if roll coating process is used, the thickness of paint film is controlled at 5-10um 3) Infrared leveling: guarantee time ≥ 3 minutes at 45-50 ℃ to ensure leveling effect 4) UV curing: two 2kW high-pressure mercury lamps are used for 5-10 seconds The distance between the UV lamp and the workpiece is 15-20cm Too close working distance will lead to paint cracking, and too far will affect the film curing Precautions: 1) the oil removal and dust removal of the workpiece must be complete, and the spray room must have clean air supply and positive pressure Prevent the product quality (dust point, shrinkage cavity) from being affected by unclean or unclean air 2） The compressed air must be cold dried, especially in summer, otherwise it will lead to too high moisture and white paint film, or there is no paint hanging on the substrate 3) The product can be used directly No water, oil and other solvents are allowed to be mixed into the product Diluent is not allowed to be mixed into the product 4) The film should be moderate, and should be controlled at 10-20um (roll coating at 5-10um), too thin will affect the leveling effect; too thick will cause the film white, sagging phenomenon, film cracking and solvent can not fully volatilize, thus affecting the adhesion 5) Ensure the infrared leveling time according to the product manual 6) Voltage instability will affect the curing, UV lamp needs to be replaced regularly 7) Avoid direct skin contact with the product Wear protective glasses and film gloves during operation If the product is accidentally splashed 8) It should be noted that the relationship between UV amount and irradiation time is closely related to the curing of photosensitive coatings Each photosensitive coating has its appropriate UV wavelength and irradiation time When it is used, it should match each other Generally, when the UV intensity is weak, the irradiation time is long, and when the UV intensity is strong, the irradiation time is shortened This is necessary before the application of photosensitive coatings The intensity of the first section of ultraviolet black light lamp is 15 - 20W / m2, and that of the second section is 200 - 300W / m2 9) It should be noted that under the irradiation of UV lamp, the temperature of the surrounding air in the photosensitive pipeline will rise rapidly, and the active dilution brake in the photosensitive coating will volatilize quickly At this time, it must be noted that cooling is required It is generally hoped that the temperature in the photosensitive pipeline will be controlled below 60 ℃ 10) Attention shall be paid to the ventilation and air exchange of ultraviolet light source Generally, the tube without ozone shall be used In order to prevent ozone, water shall be supplied before lighting to prevent the generation of ozone At the same time, in order to prevent the explosion of mercury lamp and the emission of active diluent in photosensitive coating, special attention shall be paid to the ventilation and air exchange in the irradiation equipment to prevent accidents 11) Pay attention to fire protection when parallel plate UV is not prepared, there will be fewer problems due to UV parallel reflection; however, if the light collecting reaction plate is used, the heat is concentrated, so that the temperature of the irradiated object -- the board rises sharply, which is easy to cause combustion, so the production site must pay attention to fire protection and prepare necessary fire-fighting equipment Storage and transportation: the product should be kept in a clean, dry and cool place, avoiding the exposure of ultraviolet light source (sunlight, fluorescent lamp, mercury lamp, etc.) During the loading and unloading process, it is strictly prohibited to throw or drop the products; the products shall not be stored in the open air; the warehouse must be dry and ventilated, and the storage temperature shall be ≤ 45 ℃, so as to prevent damp and keep away from the fire source; the storage period is 6 months 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,