Coating process: high pressure airless spraying construction process for exterior wall coating

Core tip: water based emulsion paint is used for indoor and outdoor painting, which has become the most popular interior and exterior wall decoration material due to its advantages of no poison, convenient cleaning, rich color and no environmental pollution However, latex paint is a kind of water-based paint with high viscosity During construction, the general manufacturers have very strict restrictions on the dilution of the original paint with water, generally 10% - 30% The transition dilution will lead to poor film formation, and its texture, scrub resistance and durability will be damaged to different degrees The degree of damage is directly proportional to the dilution, that is, the greater the dilution, the worse the film quality If the dilution requirements of the manufacturer are strictly followed, then Which is the price of Dajin diatom mud Recommended brief introduction: which is the price of Dajin diatom mud? How to buy genuine diatom mud? Guangdong diatom mud agent suggests placing a basin of cold water in the air conditioning room, so that the diatom mud wall can breathe effectively The feature of the breathing wall is obvious When the indoor air is dry, the diatom mud wall will release the absorbed water quickly Put it out to help regulate the indoor dry humidity It is suggested to place a basin of cold water in the air conditioning room, so that the wall of diatom mud can breathe effectively The feature of the wall that can breathe is obvious When the indoor air is relatively dry, the wall of diatom mud will absorb the water Paint Home News: indoor and outdoor painting with water-based emulsion paint, because of its non-toxic, convenient cleaning, rich colors, no environmental pollution and other advantages, it has become the most popular interior and exterior wall decoration materials However, latex paint is a kind of water-based paint with high viscosity During construction, the general manufacturers have very strict restrictions on the dilution of the original paint with water, generally 10% - 30% The transition dilution will lead to poor film formation, and its texture, scrub resistance and durability will be damaged to different degrees The degree of damage is directly proportional to the dilution, that is, the greater the dilution, the worse the film quality If strictly according to the dilution requirements of the manufacturer, the viscosity of the emulsion paint is very high, and the construction is difficult If roll coating, brush coating or air spraying are used for construction, the paint effect is very difficult to be satisfied The most popular way in foreign countries is to use high-pressure airless spraying machine for construction The principle of high-pressure airless spraying is to pressurize the paint (up to 210kg / cm2 or higher) through a booster pump (generally a plunger pump), to obtain the high-pressure paint through the high-pressure pipe to a special high-pressure gun, and release the pressure from a special nozzle to achieve the purpose of dispersion and atomization, and to apply it on the coating at high speed, because the paint atomization does not need compressed air, it is called airless spraying, simple It is called airless spraying This spray technology was invented in 1952, and has been widely used, such as automobiles, airplanes, construction machinery, trains, ships, containers and so on With the continuous development of architectural coatings, high pressure airless spraying technology is gradually applied in the construction industry, such as latex paint, oil paint, water paint, resin paint and so on It has been popularized abroad High pressure airless spraying is a kind of high efficiency spraying method with a bright future Different from air spraying, it uses a high-pressure pump to pressurize the paint to about 15MPa, and then spray through a special nozzle hole When the high-pressure coating leaves the nozzle and reaches the atmosphere, it immediately expands violently and atomizes into a very fine fan-shaped air flow to spray on the object surface The basic construction technology of spraying the holding method and posture of the spray gun: A hand: hold the spray gun without holding it full, ring finger and little finger gently hold the handle, index finger and middle finger hook the trigger, the handle is clamped in the tiger mouth, the upper body is relaxed, the shoulder should sink, so as to avoid long time, wrist and shoulder fatigue B Eye: when spraying, the eye should follow the spray gun Where the gun goes and where the eye goes, we should not only find the position of the spray gun, but also pay attention to the formation of the spray film and the falling point of the spray beam C Body: the spraying distance and vertical spraying angle between the spray gun and the object surface are mainly guaranteed by the body The movement of the gun should also use the body to assist the movement of the arm, not only the wrist, but the wrist should be flexible Spraying method and construction process: there are two spraying methods: vertical and horizontal alternate spraying and double spraying Double spraying, also known as gun pressing, is a common method The spray beam sprayed by the pressure gun spray gun is fan-shaped The center of the spray beam is closest to the material surface, and the edge is farthest from the material surface Therefore, the center of the spray beam is more than the edge of the coating, and the middle thick edge of the coating is thin The gun pressing method is to press 1 / 2 of the coating sprayed by the last gun to make the thickness of the coating consistent And the thickness of two spraying can be obtained by one spraying The sequence and method of spraying by pressing gun method: first spray the edges on both sides of the spraying surface longitudinally, and then spray horizontally from the upper left corner of the spraying surface according to the spraying line The center of the spray beam of the first spray path must be aligned with the upper edge of the spray surface, and later the spray paths shall overlap each other by half Before spraying of each spraying path, the spray gun shall be aligned with the outside of the side edge of the spraying surface, the spray gun shall be moved slowly, and the plate machine shall be buckled before approaching the side edge (that is, the plate machine shall be buckled during the movement of the spray gun) After reaching the end of the spray path, do not immediately loosen the plate machine Wait for the edge on the other side of the spray surface of the spray gun movers, and then loosen the plate machine (that is, before the spray gun stops moving) The spray gun must be in a straight line and cannot move in an arc The spray nozzle and the object surface must be vertical Otherwise, the coating will be thick in the middle, thin on both sides or thick on one side and thin on the other The moving speed of the spray gun shall be stable, about 10-12m per minute, and the length of each spraying shall be about 1.5m 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,