Common knowledge of coatings: the main factors affecting the deposition of electrophoretic paint solution

Core tip: in the process of electrophoresis, the deposition of electrophoretic paint solution is a troublesome matter, which not only affects the stability of the bath solution, but also affects the coating quality and production cost of the product The main factors affecting the deposition of electrophoretic paint are as follows: 1 Same or different impurity ions These ions are bound to react with the coating charged resin to form some complexes or precipitates The formation of these substances will destroy the original electrophoretic characteristics and stability of the coating The main sources of impurity ions are: (1) The impurity ions inherent in the coating; (2) Brought in when preparing electrophoretic paint solution 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: in the process of electrophoresis, the deposition of electrophoretic paint solution is a troublesome matter, which not only affects the stability of the bath solution, but also affects the coating quality and production cost of the product The main factors affecting the deposition of electrophoretic paint solution are: 1 Same impurity ions or different impurity ions These ions are bound to react with the coating charged resin to form some complexes or precipitates The formation of these substances will destroy the original electrophoretic characteristics and stability of the coating The main sources of impurity ions are: (1) the impurity ions inherent in the coating itself; (2) the impurities brought in when preparing the electrophoretic paint solution; (3) the impurities brought in are not cleaned by water in the pretreatment; (4) the impurities brought in by unclean water in the pretreatment; (5) the impurity ions generated by the dissolution of the phosphating film; (6) the impurity ions generated by the dissolution of the anode 2 Solvent in order to make electrophoretic coating have good dispersibility and water solubility, there will be a certain amount of organic solvent in the original paint In the normal production, the consumption of organic solvent is supplemented in time with the addition of paint However, if the solvent volatilizes too fast and cannot be added in time due to improper production operation or too high temperature of the bath solution, and the solvent content is reduced below the lower limit of demand, the electrophoretic paint solution will change, which makes the film thinner, and in serious cases, the resin in the bath solution will agglomerate or precipitate 3 Temperature each kind of coating has a suitable range for temperature Too high or too low temperature will speed up or slow down the electrodeposition process, making the film thicker or thinner If the temperature of the bath solution is too high and the solvent volatilizes too fast, it is easy to cause condensation and precipitation of the bath solution In order to keep the bath temperature in a relative "constant temperature state", a constant temperature device, such as a heat and cold exchanger, is required 4 The solid content of solid paint liquid directly affects the coating quality of the product and the stability of the tank liquid If the solid content of the bath liquid is too low, its viscosity will be reduced, which leads to the precipitation of the paint liquid Of course, too high solid content is not desirable, because the solid content is too high, the amount of paint entrained after electrophoresis increases, the loss increases, the paint utilization rate decreases, and the cost increases 5 In the production process of circulation mixing, the management personnel must pay attention to whether the circulation mixing of the electrophoresis tank liquid is good and whether some instrument pressures (such as filters and ultrafilters) are normal at any time Ensure that the bath liquid circulates 4-6 times per hour, and the flow rate of the bottom bath liquid is about 2 times of that of the liquid level bath liquid The electrophoresis bath can not form a dead angle of agitation Do not stop mixing except in special circumstances 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,