Common knowledge of coating: what are the effects of base strength, flatness, pH value and moisture content on finishing works?

Core tip: what are the effects of base strength, flatness, pH and moisture content on finishing works? ① Generally speaking, the strength of concrete base is high, the strength of mortar, plywood and fiberboard is in the middle, and the strength of gypsum board is low If the strength of the base course is too low, the adhesion of the coating will be affected If the base course has the phenomena of powder falling, sand rising, hollowing, etc., the coating is easy to crack, peel off, fall off and other defects ② The evenness of the base course mainly affects the final decoration effect of the coating, and the base course with poor evenness also increases the filling and finishing 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 Home of paint news: base strength, flatness, pH, moisture content on finishing works what is the impact? ① Generally speaking, the strength of concrete base is high, the strength of mortar, plywood and fiberboard is in the middle, and the strength of gypsum board is low If the strength of the base course is too low, the adhesion of the coating will be affected If the base course has the phenomena of powder falling, sand rising, hollowing, etc., the coating is easy to crack, peel off, fall off and other defects ② The evenness of the base course mainly affects the final decoration effect of the coating The base course with poor evenness also increases the workload of filling and trimming and material consumption There are four items for flatness inspection: surface flatness, internal and external angle verticality, elevation verticality and internal and external angle squareness In addition, it is required that the depth of the separation joint is the same, horizontal and vertical, without missing edges and corners; the drip line is straight and firm, without surface defects; the flashing slope meets the design requirements ③ The construction base of building coating is often mortar, concrete, etc., in which lime and cement are very alkaline, mainly due to the large amount of calcium hydroxide With the volatilization of base moisture, calcium hydroxide is brought to the surface and reacts with carbon dioxide in the air to form neutral calcium carbonate, which makes mortar and concrete tend to be neutral When the base course is dry, the alkalinity is reduced correspondingly, which can meet the requirements of coating construction If the base is too alkaline, it will affect the adhesion of the coating, and cause quality accidents such as coating discoloration and falling off The above problems often appear in the project of the year-end rush period in northern China, so it is necessary to control the base acid-base In JGJ / T 29-2003 code for construction and acceptance of architectural finishing engineering, the pH value of the base course shall not be greater than 10 If the base is too alkaline, it should be treated, otherwise, it will cause the coating defects such as excessive alkali and blooming There are many methods to determine pH value and excessive alkalinity, which should be selected according to the specific situation In the end, the surface should be cleaned with water, and then the pH value should be determined To ensure a long maintenance period of the cement mortar batch layer, it is also necessary for the proper maintenance of the wall The purpose of maintenance is to volatilize and dry the water of the mortar layer, improve the hardening strength, and carbonate the alkaline substances Generally, it needs to be maintained for 5-7 weeks in winter and spring, while it needs to be maintained for 4 weeks in summer and autumn In order to ensure that the coating does not pan alkali after coating construction, the inner and outer walls shall be coated with sealing primer ④ Excessive moisture content of the base course will affect the adhesion, drying time, film-forming performance of the coating, and affect the progress and quality of the coating works According to JGJ / T 29-2003 code for construction and acceptance of building finishing engineering, the base course shall be dry, the moisture content of the base course for water-based coating construction shall not be greater than 10%, and that of the base course for solvent coating construction shall not be greater than 8% 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,