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    Home > Coatings News > Paints and Coatings Market > Coating technology: basic construction technology of crack paint

    Coating technology: basic construction technology of crack paint

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tips: 1 The crack paint is a single component paint, and no other curing agent is required during paint preparation The construction viscosity can be adjusted by appropriate amount of special crack water produced by the same factory for construction After fully mixing the adjusted crack paint, use 100-200 mesh filter screen to filter, and then construction can be carried out The paint liquid is now prepared and used Once it is prepared, try to use it up to 4 hours within 2 hours After the paint is opened, it must be sealed immediately to avoid volatilization, moisture absorption deterioration and affecting the use effect 2 In general, the spray coating has the best construction effect, and the crack texture is round, natural, uniform and three-dimensional Application scope and advantages of roller ceramic coating Recommended introduction: the surface of ceramic rubber plate used for roller ceramic coating is cast into durable rubber plate by hundreds of independent small ceramic pieces Each ceramic piece has raised characteristics Under general conveyor belt pressure, thousands of unique cast bumps can produce positive traction, prevent slipping and extend the service life of conveyor belt roller At the same time, the bottom layer adopts high-quality rubber, which has strong elasticity and can play a good impact resistance role The scope of application of roller ceramic coating is one three six 83857180 (the same as V) 1 Roller coating in extremely harsh working environment 2 The belt joint is not suitable for fixing with iron buckle; 3 It is suitable for leather Paint Home News: 1 The crack paint is a one-component paint, no other curing agent is required when paint is prepared, and the construction viscosity can be adjusted with a certain amount of special crack water produced by the same factory, so as to facilitate construction After fully mixing the adjusted crack paint, use 100-200 mesh filter screen to filter, and then construction can be carried out The paint liquid is now used Once it is prepared, try to use it up to 4 hours within 2 hours After the paint is opened, it must be sealed immediately to avoid volatilization, moisture absorption deterioration and affecting the use effect 2 In general, the spraying construction effect is the best, the crack texture is round and natural, uniform and three-dimensional; if the hand brush construction is used, the crack will be affected by the uneven change of gesture and direction when painting, resulting in the feeling of uneven crack texture, dry rough and rigid 3 Before the construction of crack paint, the primer is generally constructed first The primer can be matched with the crack primer produced by the same factory or colored primer can be made with aluminum powder, pearlescent powder, gold powder, etc Generally speaking, the greater the color contrast between the primer and the finish, the stronger the stereoscopic sense and the better the effect But if it is applied on polystyrene plastic (PS), it can be directly sprayed with crack paint without priming a Matching crack primer for construction: the matching crack primer is the same as the crack paint No curing agent is needed when matching the paint The construction viscosity is adjusted with a proper amount of special crack water After the adjusted paint is fully mixed, filter it with a 100-200 mesh filter screen, and then the construction can be carried out The paint liquid is now used Once it is prepared, try to use it up to 4 hours within 2 hours After the paint is opened, it must be sealed immediately to avoid volatilization, moisture absorption deterioration and affecting the use effect During the construction, 1-2 layers of nitro sealing primer (dedebo) shall be applied at the base course, and then 2-3 layers of nitro white (or colored) primer shall be applied until the base course reaches the full effect After the base course is dry, it shall be polished and dedusted, and then 1-2 layers of supporting crack primer can be applied During the construction, it shall be evenly sprayed, and after it is dry, it shall be polished with 600 meshes of sandpaper to remove the dust The film coating of crack primer shall have certain fullness (generally spraying a half cross) If the film is too thin, it will affect the adhesion and strength b Construction aluminum powder, pearlescent powder, gold powder and other colored primers: aluminum powder, pearlescent powder, gold powder and so on are mixed with proper amount of Tianna water During the construction, 2-3 layers of white nitro hand broom paint are applied at the base to achieve the full effect After the paint is dry, it can be polished and cleaned, and then evenly spray 1-2 layers of mixed aluminum powder, pearlescent powder, gold powder and other paints After the paint is dry, it can be cleaned without grinding c Construction crack paint: evenly spray one layer of the prepared crack paint on the base surface which has been sprayed with primer for about 30-50 minutes Due to the shrinkage of shrinkage agent, the crack effect can be produced by itself Under the beautiful crack, the color of the base color paint will be exposed If the crack paint matches with the primer, a good pattern and color can be obtained When spraying the crack finish, the construction must be carried out after the primer is dry (generally 25 ℃, more than 6 hours), otherwise the crack will be affected Finally, semi matte, matte clear finish or two-component PU varnish shall be used to cover the crack paint surface Before large-scale construction, the sample must be sprayed on the small sample plate which has been sprayed with primer According to the effect of crack size, the construction viscosity of crack top coat and the thickness of paint film shall be selected, and the shape, air pressure and paint output (setting) of spray gun shall be adjusted When the viscosity of crack finish is large and the film is thick, the crack speed is slow and the crack texture is large; otherwise, the crack speed is fast and the crack texture is small The spraying of crack top coat must be uniform, otherwise the effect of uneven crack size will be produced If the crack effect is not good after construction, the primer can be repainted directly on the top coat (before the varnish covering process), and the repainting method is the same as before 4 Construction skills: the construction of crack paint requires certain skills The size and evenness of cracks are related to the viscosity of paint mixing, air volume, oil volume, thickness, etc The construction viscosity of paint spraying with the same crack effect shall be unified, and the color proportion of paint mixing with the same crack effect shall be unified The air pressure of the air compressor shall be kept the same during spraying, not large or small The diameter of spray gun shall be 1.5-2.0mm, and the oil outlet shall be smooth The gun speed and interval distance should be the same, and the exhaust and oil output should be well controlled 3、 Common problems and solutions of cracked paint 1 The crack of cracked paint is too thin or even the crack surface does not crack: because the crack pattern is presented by the uniform crack of the paint film, it can not be sprayed too thick at one time, otherwise the crack will be very thin or even the crack surface does not crack, the oil output and the number of guns should be carefully controlled to select the best pattern At the same time, because the crack paint is sensitive to temperature and humidity, the temperature is too low, the crack is small or even does not crack; the temperature is too high, the pattern is large Therefore, it is not suitable to construct when the ambient humidity is too high, too high or too low Generally, the temperature is 25 ℃, and the relative humidity is 75%, so as to avoid adverse effects In other cases, due to the lack of basic characteristics of the crack paint, the use of non nitro paint (including aluminum powder, pearlescent powder, gold powder and other colored primers) during the construction of base primer causes the crack paint can not effectively blend with the primer and show another crack characteristics However, the solution is very simple For the paint primer (including aluminum powder, pearlescent powder, gold powder and other colored primers) with non nitro properties that have been constructed, 1-2 layers of nitro varnish shall be sprayed before spraying the crack paint, and the crack paint shall be sprayed immediately when the nitro varnish is in the semi dry state for about 10-20 minutes (depending on the ambient temperature), so as to produce the crack effect 2 Uneven crack size: the uniform crack size is affected by many factors, especially the construction personnel's mastery of spraying skills, which can only strengthen the training and training of construction personnel, there is no other shortcut to go But at the same time, we should also master the principle of crack size: if large crack effect is needed, the primer film should be thicker, and the crack paint should be sprayed 2-3 times more, and the air volume should not be too large; if small crack effect is needed, the primer should not be too thick, and the crack paint should be sprayed thinner, and the air volume can be slightly larger However, the uniformity of spraying should be maintained all the time to obtain uniform crack effect, especially when spraying, only one spray can be applied, and one shot should be successful It is not allowed to return or repair the gun If the thickness is uneven, the size of the crack will be uneven if the gun is returned or repaired (before the crack is terminated in the spraying process, spray again on the crack to control the crack size, but this requires the construction personnel to have very advanced technical skills, which is not recommended by the general construction personnel) 3 Paint surface falling off after cracking: due to the large powder, large shrinkage, small flexibility and poor adhesion of the cracked paint, the paint surface is easy to fall off after drying and shrinkage In order to make the crack paint firm and durable, more bright and beautiful, after the crack paint is completely dry, it shall be polished and smooth After the surface is cleaned, it shall be covered with semi Matt, matte nitro varnish or polyester paint, polyurethane paint, two-component PU varnish, etc When finishing, the thin spraying shall be done for several times (at least twice) Due to lack of understanding of the basic characteristics of crack paint, some construction personnel use common putty to scrape and apply putty Paint with non nitro properties (including aluminum powder, pearlescent powder, gold powder and other colored primers) shall be constructed after priming, resulting in soft base, high tensile strength of internal stress after spraying crack paint, and turning over all soft base during shrinkage, resulting in large area peeling and peeling However, the solution is also very simple Polyester primer or polyurethane can be used for non nitro paint (including aluminum powder, pearlescent powder, gold powder and other colored primers) after priming with ordinary putty For the paint with strong sealability such as primer, strong and tough paint film and thick and hard surface, the original base course shall be sealed and strengthened first, and then the prepared aluminum powder, pearlescent powder, gold powder and other paints shall be sprayed for 1-2 times After the paint is dry and cleaned, the crack paint can be sprayed for 1 time, and the crack effect can be produced The method of surface coating is the same as above 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,
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