Coating technology: coating technology of exterior wall architectural coating

Core tips: Information: During the coating process of exterior wall coating, the coating construction specifications shall be followed, and different construction techniques and methods shall be applied according to different wall requirements, so as to achieve satisfactory effect of wall decoration Base material requirements: the most basic requirements for the coating surface of architectural coatings - 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: no powdered loose matter, no loose paint on the old wall 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: News: in the coating process of exterior wall paint, the paint construction specifications shall be followed, and different construction techniques and methods shall be applied according to different wall requirements, so as to achieve satisfactory effect of wall decoration Base material requirements: the most basic requirements for the coating surface of architectural coatings - 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 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 paint film adhesion, resulting in peeling, peeling and other phenomena If mold grows, it will also cause mildew of paint film Base material treatment 1 New wall surface: maintain for more than 1 month, humidity ＜ 6% (can be tested with hygrometer), remove floating ash 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 the anti mildew solution (can be made into 10% solution with bleaching powder), and then wash it with water; the old coating is intact, and can be repainted directly after cleaning the surface; the old coating has chalking, foaming, cracking and peeling, so the old coating needs to be removed Brush the primer and finish again 3 Wall with wallpaper: the wallpaper can be torn off, the glue can be washed off, and the paint can be applied after the wall is dried according to the condition of the wall 4 Glass fiber surface: it can be directly painted with finish paint 5 Wood: 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 and iron: the rust spots on the surface shall be removed first, and the corresponding antirust primer shall be applied immediately after cleaning; 7 Non iron: the oil stain and oxide layer on the surface shall be removed, and the primer with increased adhesion shall be applied accordingly Wall treatment 1 If the wall is flat, it is not recommended to use putty 2 If putty is used, it is easy to apply it thin rather than thick 3 The putty shall have good strength and durability besides being easy to be approved and polished For exterior walls, kitchens and bathrooms, the requirements for putty shall have better cohesiveness, cohesiveness durability and water resistance 4 Treatment methods for possible problems on the wall: 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; mold can be washed with high-pressure water outdoors, and can be wiped for several minutes indoors with bleach, and then rinsed with clear water to dry Coating system: general coating system for exterior wall building, divided into three layers: primer, intermediate coating and finish 1 primer The primer can seal the wall alkaline, improve the adhesion of the top coat, and have a great influence on the surface coating performance and surface effect If the primer is not used, the adhesion of the paint film will be weakened, and the alkaline wall surface will have a greater impact on the performance of the paint In particular, the use of white cement putty on the bottom may cause problems such as paint film pulverization, yellowing, alkali penetration, etc., damage the performance of the finish paint, and affect the service life of the paint film 2 Intermediate painting The main function of middle coat is to improve adhesion and covering power, provide three-dimensional pattern, increase fullness, and correspondingly reduce the amount of top coat 3 top coat Topcoat is the last coating in the system, which has decorative function and resists environmental damage In consideration of different requirements of users, different exterior wall finish products can be recommended 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 Low temperature will cause problems such as pulverization and cracking of emulsion paint film Environmental humidity makes the paint film not dry for a long time, and eventually leads to poor film formation Weather factors must be considered in the construction of exterior wall Before applying latex paint, it is not allowed to rain for 12 hours to ensure that the base material is dry; after application, it is not allowed to rain for 24 hours to prevent the paint film from being damaged by rain Painting skills to achieve good painting effect, skilled operation level is required, but the construction of latex paint is not difficult First of all, the base material shall be clean, dry and firm, operated in accordance with the instruction manual, with suitable coating conditions and accurate dilution ratio Excessive dilution will make the coating not cover the bottom, powdered, glossy coating lose light and different colors Secondly, good construction tools are also necessary 1 The painting sequence of exterior wall shall be from top to bottom, from roof, gutter, column top, beam and rafter to wall, door, window and base plate Each part shall also be painted from top to bottom When painting each part, do not stop halfway If you have to stop, you should also choose the original connection part of the house structure, such as the joint between the wall and the window frame This will avoid unsightly seams When brushing the cornice board, the following two steps shall be taken: first brush the bottom of the cornice board, and then brush the sunward part When brushing several cornices at the same time, move the ladder and follow the wall in turn The action should be fast in the process of painting Brush back and forth at the joints that have been dried and have not been dried from time to time to avoid leaving overlaps or joints 2 Windows: hinged sliding windows shall be painted The order is top, side, bottom, then crossbar, window frame, top line board and windowsill 3 Flat door: the painting method of this kind of door is the same as that of the wall, first draw the frame and then fill it up, then brush from top to bottom, and finish at the joint between the door and the wall Another method is to use the roller first, and then use the brush to gently take it in the vertical direction to remove the stripe mark of the roller 4 Fancy wooden door: this kind of door shall be painted from the concave and convex parts at the top first, and each part shall be brushed with the edge first and then filled, and finally the rest parts and frames on the door and their joints with the wall shall be brushed 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,