Coating general knowledge: Construction Technology of fluorocarbon coating for building exterior wall

Core tip: fluorocarbon coating refers to the coating with fluororesin as the main film-forming material, also known as fluorocarbon paint, fluorocarbon paint, fluororesin paint, etc Among all kinds of coatings, due to the introduction of large electronegativity of fluorine element and strong carbon fluorine bond energy, fluororesin coatings have particularly superior performance: weather resistance, heat resistance, low temperature resistance, chemical resistance, and unique non stick and low friction Its core technology was born in DuPont company in 1938 The physical and chemical properties of fluororesin coatings in the global chemical industry at that time The world caused a sensation After decades of rapid development, fluorocoatings in construction, chemical industry, electrical appliances 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 Coating home news: fluorocarbon coating refers to the coating with fluororesin as the main film-forming material, also known as fluorocarbon paint, fluorocarbon paint, fluororesin paint, etc Among all kinds of coatings, due to the introduction of large electronegativity of fluorine element and strong carbon fluorine bond energy, fluororesin coatings have particularly superior performance: weather resistance, heat resistance, low temperature resistance, chemical resistance, and unique non stick and low friction Its core technology was born in DuPont company in 1938 The physical and chemical properties of fluororesin coatings in the global chemical industry at that time The world caused a sensation After decades of rapid development, fluorine coatings have been widely used in various fields such as construction, chemical industry, electrical and electronic industry, mechanical industry, aerospace industry, household products, and become the coating brand with the highest comprehensive performance after acrylic coating, polyurethane coating, silicone coating and other high-performance coatings At present, the widely used fluororesin coatings are mainly PTFE, PVDF and PEVE China is the third country after the United States and Japan to have the synthesis technology of fluorocoatings and realize industrialization The construction process of fluorocarbon paint is different due to different spraying materials The construction process of fluorocarbon paint for exterior wall is attached for reference only: 1 Requirements for base course 1 The quality of base course for plastering and concrete shall conform to JGJ code for construction and acceptance of Building Decoration Engineering; 2 There shall be no dirt on plastering layer or concrete surface course (including partition joint, window frame, etc.); 3 The surface of the base course must be firm and free of looseness, cracks or peeling, flatness ≤ 2mm, and the base course shall be free of floating dust and adherent particles; 4 The water content of plastering and concrete base course shall be no more than 10%, pH value shall be no more than 9, and new cement shall be applied Mortar walls need to be cured for more than 10 days in summer, more than 20 days in winter, cast-in-place concrete walls need to be cured for more than 21 days in summer and more than 28 days in winter 2、 Base surface treatment 1 Check the flatness of the wall surface The large protrusions shall be sanded and leveled, and the large depressions or holes shall be filled with cement mortar and polished and leveled; 2 Cut the large cracks on the wall surface and fill the high elastic putty for several times until the wall surface is flat, and then polish and leveled after the putty is dry; 3 Use a brush, blade or sandpaper to remove the particles and sundries on the wall surface, and remove the loose cement layer on the wall surface; 4 After treatment, it is required to meet the flatness requirement of ≤ 2mm; 5 The wall surface is basically clean, free of floating dust and adhering particles 3、 Full batch of special anti crack putty for fluorocarbon paint 1 Use special anti crack putty for fluorocarbon paint: special additive for anti crack putty for fluorocarbon paint: water = 20; 1; 8 to mix the putty The putty must be fully stirred with electric hand drill, 2 The longest storage time is 4 hours, which shall not be used for more than 4 hours, and the solidified slurry shall not be used; the wall surface shall be checked to see if there is any dirt such as particle dust, which shall be cleaned; 3 The aluminum alloy with a length of 2 meters shall be used Drag and scrape the putty with the guiding rule First scrape it vertically, then scrape it horizontally The running speed and force of the guiding rule should be balanced, otherwise it will form waves along the moving direction of the guiding rule, which will affect its flatness 4 Paste the decorative tape, divide the boundary strip according to the requirements, and then put the putty after the boundary is divided, and then tear the tape off one by one 5 Generally, the putty is embedded 4-5 times; 6 The putty layer shall be sanded after drying (generally no more than 4 hours) If the time is too long and the putty is dry and hard, it will be difficult to sand (waste of manpower and sandpaper) The rough greasy surface must be completely polished, otherwise a large amount of putty will be wasted in the subsequent construction; 7 120 mesh or 150 mesh sandpaper shall be used for polishing; 8 After the putty is polished, the uneven phenomenon of the wall surface shall be completely eliminated, and the external angle and waistline shall be straightened at the same time 4、 Polishing putty construction 1 Polishing putty construction shall be carried out on the polished putty; 2 The surface shall be free of scratch marks, especially the internal and external corners, drip lines, window edges and walls near the downpipe; 3 The lines shall be straight, the external corners shall be straight, and there shall be no defects; 4 Picking with nails shall be free of powder dropping, and the bonding force shall be qualified; 5 The hand feeling shall be smooth, and there shall be no convex, concave or undulating feeling 5、 Primer spraying 1 Check whether the putty meets the requirements and repair the problems in time; 2 Spray primer on the completely dry wall (the wall should be dry and the water content of the wall is less than 8%) (air pressure is 5-8KG / cm2, no water spraying); 3 It is required to spray evenly without omission, keep the color uniform, and avoid blooming Construction is not allowed in windy (above grade 6) and rainy days 4 The primer shall be sprayed once and inspected after spraying If there is batch scratch mark or bee eye on the wall surface, it must be polished to meet the requirements; 5 The 280 mesh or 360 mesh water abrasive paper shall be used for grinding, and the coating shall not be worn through carefully; 6 The dust shall be removed after grinding, and the dust generated by grinding on the wall surface shall be cleaned with a rag If the dust removal is not complete, the fluorocarbon paint will not be able to achieve a smooth coating after construction; 7 After spraying the primer, the color shall be uniform, the luster shall be uniform, the surface of the coating shall be smooth, and there shall be no dust and other stains 6、 Fluorocarbon finish paint spraying 1 The primer must be completely dry, and the wall shall be free of dust and other sundries; 2 Construction ratio, main paint: curing agent: diluent = 10:1:2; 3 The prepared fluorocarbon paint must be filtered with 200 mesh screen, and the diluent shall be continuously stirred during the placing process to avoid sedimentation; 4 Spray gun model: w-77, nozzle size: 1.5-2.0mm, air pump pressure: 0.3-0.5mp; 5 During the construction, the cooperation of spraying number, spraying area, spraying base surface and hanging cage distribution shall be considered, and the construction personnel shall be arranged to spray at the same time, and the spraying thickness shall be as much as possible on the premise of ensuring no sagging; 6 Anti pollution and anti-virus work shall be done well, and downpipes shall be protected Workers shall wear anti-virus masks, gloves and other protective articles during construction Meanwhile, fireworks are strictly prohibited The spraying shall be uniform, with reasonable density, without sagging, uneven light and shade, blooming and other phenomena The hand feel shall be delicate, with uniform luster, without batch scratch marks and unevenness 7、 Cleaning and sanitation 1 Clean the polluted places such as glass and downpipe, pay attention to the protection of other finished products, and clean them thoroughly; 2 Clean the living area and inventory area, and restore the original 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,