Coating technology: home wall construction technology

Core tips: I requirements for base material The most basic requirements for the painting surface of architectural coatings are dry, firm and clean 1 Drying: the cement wall shall be maintained for at least one month (7 weeks in winter), the humidity shall be lower than 6%, and the humidity on the wood surface shall be lower than 10%; the wall shall be free of water seepage, cracks and other structural problems 2 Firm: there is no powdered loose matter, and there is no loose paint on the old wall 3 Cleaning: no oil, grease, mould, algae and other adherents If the substrate does not meet the requirements, the film performance will be seriously affected High wall humidity may cause blistering and peeling of paint film 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 Coating home news: first, the base material requirements of the construction coating surface of the most basic requirements - dry, solid, clean 1 Drying: the cement wall shall be maintained for at least one month (7 weeks in winter), the humidity shall be lower than 6%, and the humidity on the wood surface shall be lower than 10%; the wall shall be free of water seepage, cracks and other structural problems 2 Firm: there is no powdered loose matter, and there is no loose paint on the old wall 3 Cleaning: no oil, grease, mould, algae and other adherents If the substrate does not meet the requirements, the performance of the paint film will be seriously affected High wall humidity may cause blistering, peeling and peeling of paint film, as well as wall alkali penetration, paint film loss of light and even mildew; loose substrate with dirt adhesion will affect the adhesion of paint film, resulting in peeling and peeling, and other phenomena, such as mold breeding, will also cause mildew of paint film 2、 Base material treatment 1 New wall Maintenance for more than 1 month, humidity ＜ 6% (it can be tested with a hygrometer), and remove the dust stains and alkali exudation 2 Old wall Wash with high-pressure water or mechanical grinding to remove the dust and bacteria and algae that may grow, clean and dry, if necessary, brush with anti mildew solution (10% solution can be prepared with bleaching powder), and then wash with water; the old coating is in good condition, and can be repainted directly after cleaning the surface; the old coating has pulverization, blistering, cracking and peeling, so it is necessary to remove the old coating and repaint the primer twice 3 Walls with wallpaper It can tear off the wallpaper, wash off the glue, and make proper treatment according to the wall condition after drying, then construct the coating 4 Glass fiber surface It can be directly applied with finish paint 5 timber Remove or replace the worn and rotten parts on the surface, clean and repair the surface, and inlay the joint between the door and window and the wall with elastic filler 6 Metal surface Iron: the rust spots on the surface shall be removed first, and the corresponding antirust primer shall be applied immediately after cleaning; non iron: the oil stain and oxide layer on the surface shall be removed, and the primer with increased adhesion shall be applied accordingly 3、 Wall treatment u if the wall is flat, putty is not recommended U if putty is used, it is easy to apply it thin rather than thick U for putty, besides easy to be approved and polished, it should also have good strength and durability For exterior walls, kitchens and bathrooms, the requirements for putty shall have better cohesiveness, cohesiveness durability and water resistance U treatment methods for possible problems of wall surface: dust and powder can be washed with high-pressure water outdoors, and can be wiped clean with wet cloth indoors; grease can be washed with neutral detergent; mortar can be removed with shovel and scraper, etc.; mould can be washed with high-pressure water outdoors, and can be wiped for several minutes with bleaching agent indoors, and then rinsed with clear water to dry; old paint film can be washed with high-pressure water, or scraped off with scraper , mechanical grinding; damp - strengthen ventilation and prolong drying time; crack and joint - scrape off loose old paint film or plaster, repair with water-insoluble filler, larger and deeper holes can be inlaid in batches; nail rust - brush off rust, polish nail head, knock nail down at 3 and 4mm of paint surface, apply antirust primer and polish in batches 4、 Construction conditions latex paint is a kind of water-based paint, which requires high construction and maintenance conditions The construction and maintenance temperature is higher than 5 ℃ and the environmental humidity is lower than 85%, so as to ensure good film formation Generally speaking, the maintenance time of emulsion paint is 7 days (25 ℃), and the low temperature should be appropriately extended Low temperature will cause problems such as pulverization and cracking of emulsion paint film Environmental humidity will keep the film dry for a long time, and eventually lead to poor film formation Weather factors must be taken into account in the construction of external walls Before applying emulsion paint, it is not allowed to rain for 12 hours And the humidity of paint construction and maintenance should not be too low, especially for two-component reactive paint, the film-forming process will be very slow at low temperature (< 5 ℃) Therefore, it is necessary to ensure that the base material is dry After painting, it cannot rain for 24 hours to prevent the paint film from being damaged by rain 5、 In order to achieve good coating effect, skilled operation level is needed, but the construction of emulsion paint is not very difficult First of all, the base material shall be clean, dry and firm, operate according to the operation instruction, the coating conditions shall be suitable, the dilution ratio shall be accurate, and excessive dilution will make the coating not cover the bottom, powdered, glossy coating will lose light and have different colors If the painting technique is not proficient enough, the matte coating can be selected, so that the wall defects are not easy to expose During the construction of glossy emulsion paint, such as ha San Jia 1 and beautiful J50 products, the bottom surface shall be as flat as possible, and the wall surface shall be applied with putty for several times, so as to feel that the wall surface has no high and low feeling, otherwise the light will easily show the defects; Secondly, good construction tools are also necessary The surface effect of the paint film obtained by spraying is the best, but it may cause environmental pollution; generally, roller coating is relatively simple and feasible, so it is used most, short hair roller is a better choice, although the amount of paint is small, but it is not easy to bubble, and the obtained paint film is relatively flat The common painting sequence of interior wall painting is from the top to the bottom In practice, it starts from the ceiling, then the walls, doors and windows, and finally the skirting boards, window rafters, etc Before using the paint, mix it fully according to the instructions on the barrel If you use the paint of the same color and different batches and brush it on the same plane, it is recommended to mix them in a larger container before using them to ensure the overall uniformity It's like knitting a sweater If the wool is not enough, it's hard to buy the wool without any color difference Sometimes there will be a small amount of color difference between batches Brush: the brush should remove the fallen bristles before use Comb thoroughly with your fingers to make sure it's all cleared Moisten the brush with a liquid of the same nature as the paint you are using If you want to use water-based paint, wet the brush with water Soak the brush in solvent before using oil-based paint When using paint, dip the brush in the paint half, which is very important to prevent backflow of paint It is difficult to remove the paint deposited on the back of the brush and make the brush bristles hard After picking, tap the brush on the edge of the bucket to avoid excessive picking, but do not scrape hard When painting a large area with a paint brush, the stripe as wide as the brush can be painted vertically first, and then evenly painted horizontally until it is covered, and finally lightly brushed vertically again If the brush and roller are used at the same time, first draw out the frame of the part to be brushed, which is called cut in The purpose is to draw a plane suitable for roller brushing on the wall with a paint tape about 3cm wide The specific operations are as follows: use the narrow end of the paint brush to frame on the wall, do not use too much force, and the range of a sketch should not be too large, then use the roller to brush, and use the roller to repaint the line before the end, so as to avoid the frame effect caused by the paint drying too fast at the line Roller coating: before use, first wet it with water (water-based coating) or solvent (oil-based coating) If you want to brush the ceiling, you can first connect a wooden or aluminum rod on the handle of the roller, which will be more handy Pour the paint into the reclaiming tray from the paint barrel Do not overfill it at one time Dip the drum gently into the paint, roll it evenly back and forth for several times, so that all parts of the brush are full When painting, the roller shall be painted zigzag on the wall, and the first painting shall be from bottom to top Every time you use it, you can brush about half a square When the paint on the drum is about to be brushed, go back to the place just brushed, so as to spread the paint evenly During the break, the coated roller cannot be exposed to the air for a long time It must be wrapped with plastic bags or soaked in water or solvent according to the nature of the coating 6、 After finishing the post coating treatment, the tools shall be cleaned immediately, otherwise the tools will be damaged after the coating is dry; the remaining coating shall be kept clean and sealed 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,