Coating knowledge: common problems encountered in the construction of real stone paint

Core tip: some real stone paints lose more sand during spraying, which can reach about 1 / 3 in serious cases, resulting in waste In addition to the reasons of construction methods, raw materials and formula may also cause the above phenomenon At present, there are two kinds of sand used for real stone paints: artificial sand and natural sand According to observation, the amount of sand loss of real stone paints prepared with natural sand is less than that of artificial sand This may be related to the hardness and surface state of the sand Generally speaking, it is easy to drop sand when using sand with high hardness and smooth surface In addition, the grading of sand is also very important when preparing stone paint It is suggested that the stone paint with proper gradation not only has less sand loss but also has a closer coating Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Paint Home News: some real stone paint in spray more sand, serious up to 1 / 3, causing waste In addition to the reasons for construction methods Raw materials and formula may also cause the above phenomenon Currently, there are two kinds of sand used for real stone paint: artificial sand and natural sand According to observation, the real stone paint prepared with natural sand, sand loss is less than that of artificial sand This may be related to the hardness and surface state of the sand Generally speaking, it is easy to drop sand when using sand with high hardness and smooth surface In addition, the grading of sand is also very important when preparing stone paint It is suggested that natural sand should be used as much as possible in the preparation of stone paint, and the sand should be graded to a certain extent In addition, the consistency of the coating also has a certain impact on the phenomenon of desanding during spraying When the coating is too thick, the construction is difficult, and when it is too thin, the initial viscosity of the sand on the wall is too low, which will cause the sand to fall Therefore, in the case of no difficulty in construction, it is helpful to improve the consistency of the coating as much as possible to solve the problem of sand removal The paint with good quality real stone paint should be very hard Nails should not be picked If it is used in good weather for three days, it can still be removed with fingernails It should be regarded as too soft The reason why the real stone paint is too soft is that the emulsion is not appropriate Many manufacturers are using the same emulsion as making latex paint when preparing genuine stone lacquer, which is wrong The emulsion in the real paint formula is low When the film is formed, the coating is not tight enough because of the presence of a large amount of sand Therefore, the emulsion with high cohesive force and the lowest film forming temperature should be selected According to the study, the bonding strength of the emulsion used for genuine stone lacquer should not be lower than 3MPa. The minimum film forming temperature should not be lower than 2010. The higher the minimum film forming temperature may cause the disadvantage that the film is not easy to form when the temperature is low It can be solved by proper addition of film assistant The film-forming agent can volatilize completely after the coating is dried, which will not affect the performance of the coating generally At present, the use of drunk vinegar 12 in the production of water emulsion paint also has a good effect in the use of genuine stone paint The dosage is generally added to 5 parts in every one hundred lotions The acrylic emulsion used as film builder of genuine stone paint should have good water resistance after drying Therefore, the coating should not appear white after drying However, some of the real stone coatings will turn white after every rain, and the coating will become loose After the rain stops, the coating will be restored to the original color by the sun Through analysis, it is caused by the poor water resistance of the coating and the absorption of water The structure of polyacrylic cheese is analyzed The coating of real stone paint shall have good water resistance However, due to the addition of surfactants when acrylic emulsion is synthesized, some manufacturers use excessive surfactants to increase the stability of emulsions When some manufacturers prepare the real stone paint, they add some substances such as fusiform fiber turbulence, monoethyl cellulose as thickener, and sodium benzoate as preservative These substances are water-soluble or hydrophilic After the coating film is formed, the water resistance of the coating is greatly reduced Experiments show that pure acrylic emulsion and quartz sand are mixed without any auxiliaries The water absorption rate of the coating formed by spraying is 0.42%; and the water absorption rate rises to 4.3% by adding 0.4% ethyl fiber turbulence on the basis of the above coating Because the coating of real stone paint is thick, once the water is absorbed, it is not easy to release in a short time Therefore, the appearance is white and the inside of the coating is loose In order to solve these problems, raw materials and formula can be improved First of all, excellent quality emulsion should be selected The silicone modified acrylate emulsion (silicone acrylic emulsion) developed in recent years itself has good hydrophobicity It can effectively resist the invasion of water Secondly, special thickeners should be selected There are many thickeners available in the market at present Special materials shall also be selected as preservatives Recently, the silicone water-proof solution supplied in the market was added to the real stone paint, and the unexpected good effect was achieved The rain water will roll down on the surface of the coating in the form of water drops without seeping into the coating, which can make the real stone paint have both decorative effect and waterproof function 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,