Coating technology: Technology for coating typical steel plate

Key tips: 1 Preparation before painting 1 Before painting, the type, model and specification of all paints shall be checked to see if they meet the requirements of construction technology Paint of different quality or deterioration shall not be used 2 Before painting, the basic composition, function and construction method of the paint shall be understood, and appropriate painting tools shall be selected and determined according to the respective construction requirements of the paint 3 Because the specific gravity of various components in the paint is different, the general paint will be precipitated in different degrees after storage Therefore, it is necessary to mix the paint to the full average before painting 80-120 should be used if paint skin or particles are found Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Paint Home News: 1 Preparation before painting 1 Before painting, check whether the variety, model and specification of all paints meet the requirements of construction technology Paint of different quality or deterioration shall not be used 2 Before painting, the basic composition, function and construction method of the paint shall be understood, and appropriate painting tools shall be selected and determined according to the respective construction requirements of the paint 3 Because the specific gravity of various components in the paint is different, the general paint will be precipitated in different degrees after storage Therefore, it is necessary to mix the paint to the full average before painting If paint skin or particles are found, they shall be filtered with 80-120 mesh screen 4 All kinds of epoxy antirust paint, epoxy coal tar pitch heavy-duty anticorrosive paint, epoxy anticorrosive finish paint and acrylic polyurethane finish paint are two-component two tank coatings Before use, it is necessary to mix evenly according to the specified weight ratio If the mixing ratio is wrong, it will affect the dryer's ability to prevent rust and corrosion Epoxy type, coal tar epoxy thick paste paint, acrylic polyurethane paint and other coatings are all crosslinked and solidified After a period of time, the two groups will gradually gelled to the point where they cannot be used Therefore, it is necessary to calculate the usage of the coating area before mixing and use it up within the designated time 5 For different types of paint, if the viscosity is too large, it is necessary to use the diluent matching with it to adjust to the ideal coating viscosity 6 The storage period stated in this copy is the warranty period of our factory, during which our factory is responsible for the quality of the paint itself After the storage period, it is not impossible to use the product, and it can still be used after the product has been overhauled and qualified 2、 Painting 1 Painting: when painting with paint brush, the direction of painting shall be from top to bottom, then left and right The paint brush shall not be dipped too much to prevent dripping When applying heavy-duty anticorrosive coating, the interval between brushes shall not be too large to avoid too thin film In case of rough surface, edge corners and bulges and other departments should pay special attention, it is better to precoat one layer first 2 Roll coating: when the roller is used for coating, the paint dipped on the roller shall be evenly distributed When painting, the dynamic speed should be kept to a certain extent, not too fast Do not press the roller too hard For the concave parts such as welds and cuts, special attention should be paid to the treatment It is better to precoat one layer first 3 High pressure airless spraying: This is the fastest coating method, and can obtain a very thick film Therefore, in order to determine the film thickness, it is best to use airless spraying In the actual coating, the vertical and horizontal spraying method of first up and down then left and right or first left and right then up and down shall be adopted The use of unpainted spraying requires a higher skill The spray gun and the surface to be coated should be kept at a horizontal interval When operating, the spray gun should be prevented from high interval or arc swing 4 Control of film thickness: in order to make the heavy-duty anticorrosive coating perform its best function, sufficient film thickness is extremely important Therefore, the film thickness must be strictly controlled The thickness of each coating layer obtained by painting with brush or roller is thinner, and the number of coating layers shall be at least twice of that of high-pressure airless spraying, so as to reach the specified thickness For edges, corners, welds, cuts and other parts, before spraying, a layer of paint shall be applied first, and then a large area of paint shall be applied to ensure the film thickness of the protruding parts During construction, coating shall be carried out according to the usage on time, and wet film thickness gauge is often used to measure the film thickness If the film thickness does not meet the requirements, it must be repaired 5 The distance between different types of coatings is different The construction shall be carried out according to the respective requirements of each coating In particular, it should be pointed out that it is better to finish the next coat one by one when the paint film is only dry, so that the upper and lower layers are slightly mutually soluble and there is no problem of adhesion between layers After complete cure, if repainting, roughen with sandpaper 6 Usage amount: the usage amount in this copy is the theoretical value, which refers to the amount of paint per unit area calculated theoretically under the ideal premise and under the same average film thickness However, the actual consumption of paint during painting depends on the thickness of the film, the loss during painting, the painting method, and the coarseness of the surface to be coated When estimating the actual consumption of paint, 50-80% of the paint consumption should generally be calculated within the theoretical consumption 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,