Coating classification: electrostatic coating uvcoating

Core tip: brief introduction: compared with other coatings, UV coating has many unique advantages, such as fast curing speed at room temperature, high production efficiency, energy saving, small environmental pollution, excellent coating performance, etc it is a recognized energy-saving and environmental protection coating The essence of electrostatic spraying is to use high-voltage electrostatic field to make the negative paint particles move in the opposite direction of the electric field, and the paint particles are adsorbed on the surface of the workpiece Coating formulation: the formulation design principle of electrostatic coating uvcoating is as follows: Selection of raw materials 1 Selection of resin In light and solid Paint knowledge | precautions for wall paint color selection Recommended introduction: when painting the wall, the owner sometimes has difficulty in choosing what color of the wall paint to paint In fact, there is no ugly color in the wall paint, only the disharmonious color matching The use of wall color contains the knowledge of health Too strong color will stimulate people's perception, make people have a sense of fidgety, affect people's mental health Grasp the basic principles of wall color and paint a colorful space 1、 Wall paint color selection notice 1 Light color is generally used for the top surface Light colors make people feel light, dark colors make people feel heavy Usually, the treatment of rooms is from top to bottom, from shallow to deep For example, the ceiling and walls of rooms are white and Introduction: compared with other coatings, UV coating has many unique advantages, such as fast curing speed at room temperature, high production efficiency, energy saving, small environmental pollution, excellent coating performance, etc., and is a recognized energy-saving and environmental protection coating The essence of electrostatic spraying is to use high-voltage electrostatic field to make the negative paint particles move in the opposite direction of the electric field, and the paint particles are adsorbed on the surface of the workpiece Coating formulation: the formulation design principles of electrostatic coating UV coating are as follows: 1 The selection of resin is among the components of UV coating, UV resin is the main body of UV coating, and its performance basically determines the performance of coating film after curing, so the selection of resin is the most important link of formulation design The resin used for electrostatic coating of UV coating needs to be a resin with fast solvent release, good wetting fluidity, easy atomization, certain thixotropy, good combination of leveling and anti sagging, and high resistivity Solvent based acrylic resin has the best effect, which is characterized by fast solvent release, strong anti solvent dilution ability and good flow wettability 2 The selection of active monomers is an important component of UV curable coatings It not only dissolves and dilutes the UV resin, regulates the viscosity, participates in the UV curing process, affects the UV curing speed and various properties of the cured film, but also affects the resistivity of the whole system Therefore, it is very important to select the appropriate active monomer The proportion of monomer in the formulation should be considered comprehensively from the viscosity, resistivity, curing speed, film hardness and other aspects when designing electrostatic spraying UV coating 3 Solvent selection the main function of solvent in coating is to reduce viscosity to meet the construction requirements Different kinds of solvents have different interaction with resin and their own volatilization rate and dielectric constant, which results in different effects in spray process and leveling drying process The most influential factors are the dielectric constant and boiling point of the solvent The high resistivity of TOL, EAC and BAC has little effect on the coating resistance, and the evaporation rate is moderate after matching After a short time of evaporation leveling, it can basically volatilize completely and will not remain in the coating film, and will not affect the overall performance of the coating film, and the slow volatilizing solvent BAC can help the coating leveling Therefore, tol, EAC and BAC are generally selected as solvents for electrostatic spraying of UV coating 4 The selection of leveling agent no matter what kind of coating method is used, there is a project of flowing and drying to form a film after construction In order to prevent the film from pinholes, shrinkage holes and orange peel in the drying and curing project, so as to form a flat, smooth and even film, leveling agent should be added There are many kinds of leveling agents Different leveling agents have different effects Among them, the short wave leveling agent can help to eliminate the whirlpool trace formed by Bernal vortex, and make the coating surface uniform when the dumb powder is blooming; the long wave leveling agent can help the coating achieve a flat effect; the leveling agent has a strong foam stability So it is very important to choose leveling agent Acrylic leveling agent and fluorine modified acrylate leveling agent can improve the flatness of the coating Silicone leveling agent is very helpful to improve the uniformity and hand feel of the coating, but its film flatness is poor and its timely leveling is poor Because the electrostatic coating film is in a vertical state, it is not conducive to the leveling of the film itself And different from the plane leveling, if the real plane state can improve the leveling through the extension of the standing time, while the standing time of the facade flow is not very helpful to the leveling, so the silicone leveling agent should be used less or not in the formulation of the electrostatic coating uvpaint Table 1: basic components of electrostatic coating material name, mass fraction /% UV resin 30-50, UV monomer 5-20, solvent 10-20, leveling agent 0.5, defoamer 0.3, photoinitiator 5-8, basic construction parameters: Table 2: basic construction parameters of electrostatic coating, project parameter index: electrostatic voltage / kV 60 wind pressure / MPA 0.3, coating output / (ml / min) 200 Coating line speed / (M / min) 4 standing leveling time / min 15 leakage voltage / V 30 film thickness / μ m 35 ultraviolet light energy / (MJ / cm2) 350 paint home is specialized in coating, diatom mud, paint coating, coating process, news information and coating of fire retardant coating, diatom mud, paint coating, coating process, decoration knowledge and decoration effect map of fire retardant coating,