Common knowledge of coating: several problems should be paid attention to when using emulsion paint

Core tips: first, how to choose latex paint with many varieties, different manufacturers' formulas and different production processes, so that its performance and decoration effect are very different, what kind of latex paint is used for decoration? This is a question that people often ask At present, there are a large number of imported latex paint on the market, the price is 40-50 yuan / kg Generally, the reasonable consumption is 5 square meters / kg, and the cost of wall coating alone is 8-10 yuan / square meter In addition to the construction cost and other costs, the cost per square meter is generally about 20 yuan, and a set of 60 yuan is needed for construction Paint knowledge | precautions for wall paint color selection Recommended introduction: when painting the wall, the owner sometimes has difficulty in choosing what color of the wall paint to paint In fact, there is no ugly color in the wall paint, only the disharmonious color matching The use of wall color contains the knowledge of health Too strong color will stimulate people's perception, make people have a sense of fidgety, affect people's mental health Grasp the basic principles of wall color and paint a colorful space 1、 Wall paint color selection notice 1 Light color is generally used for the top surface Light colors make people feel light, dark colors make people feel heavy Usually, the treatment of rooms is from top to bottom, from shallow to deep For example, the ceiling and walls of rooms are white and Paint Home News: 1 How to choose a variety of latex paint latex paint, and different manufacturers of different formulations, different production processes, so that its performance and decoration effect is very different, what kind of latex paint is used for decoration? This is a question that people often ask At present, there are a large number of imported latex paint on the market, the price is 40-50 yuan / kg Generally, the reasonable consumption is 5 square meters / kg, and the cost of wall coating alone is 8-10 yuan / square meter In addition to the construction cost and other costs, the cost per square meter is generally about 20 yuan, and the construction of a set of 60 square meters of two rooms and one hall requires 3000-4000 yuan Due to the thin coating of emulsion paint on the wall, low surface strength, easy to be damaged by hard objects such as desks and chairs Although it can be wiped with wet cloth after being stained, it will still leave slight traces Therefore, it is a wrong view to think that the selection of high-grade paint can keep it intact once and for all, clean and beautiful The author thinks that foreign lacquer is superior to domestic latex paint in advection, fineness and color matching, and some foreign latex paint is still produced in China, and it uses domestic emulsion Therefore, it is not necessary to use foreign products when choosing latex paint In fact, domestic latex paint and various indexes are quite good, and the price is only 1/2 or 1/3 of foreign lacquer, so when decorating the living room, It is suitable to choose domestic emulsion paint with good price In the process of decoration, latex paint should also be selected from three angles: 1 The function of decoration effect latex paint is mainly decoration The decoration effect is related to the overall design and color selection, as well as the performance of latex paint The leveling, color matching, light type and hand feeling of emulsion paint directly affect the decoration effect 2 The selection of emulsion paint according to the place of use is based on the requirements of different places for the performance of emulsion paint, which is the main basis for the selection of emulsion paint For example: hotels, restaurants and some office buildings with high requirements for wall decoration, generally use high-grade varieties Common emulsion paint can be used in common office, factory and other places with low requirements Underground engineering, kitchen, toilet, ground floor and other places with high waterproof requirements should choose latex paint with good waterproof performance 3 It is obvious that the investment cost is the basis for choosing latex paint, and the level of the cost determines the product grade But it should also be analyzed according to the specific situation For example, if the economy does not allow, it can be used in combination Generally speaking, high-grade emulsion paint can be used for walls that are easy to get wet and dirty, and common emulsion paint can be used for the top surface For home decoration, the living room is easy to be stained, and the kitchen and toilet have high humidity The high-grade latex paint with scrub resistance and water resistance should be used The ordinary latex paint can be selected for the bedroom Of course, if the economy allows, the same kind of materials can be used to maintain overall consistency 2、 How to ensure the construction quality of latex paint formed by the film and paint Different, it is porous and breathable, and has a certain alkali resistance It can be painted on the wall base that has been preliminarily dried and turned white A small amount of water in the base layer can be transferred and distributed outwards through the film without damaging the film The film drying is also fast, and the interval between two times during construction is only a few hours These characteristics are very beneficial to speed up the construction progress and shorten the construction period One of the main advantages of latex paint is that it has a very good leveling property, and the construction according to the construction specifications can ensure that its surface is as fine as porcelain As the surface layer is only 0.1mm thick, it is necessary to treat the base course well, which requires that the base course has sufficient strength, no pulverization and sanding At the same time, the requirements for the flatness of the base course are also very high, otherwise the advantages of fine and smooth emulsion paint will not be shown Therefore, the base course needs to be treated with three coats and three grinds before painting, and then two coats of emulsion paint are rolled to ensure the construction quality In order to save materials and make construction easy, some construction personnel mix water into emulsion paint, which is not allowed by economic emulsion paint Some high-grade latex paint shows that it can be mixed with water, some are concentrated, some have excellent covering power, some have excellent washability, but this does not mean that it can be mixed with water without limit, and the painting area can be expanded without limit Assuming that the solid content of emulsion paint is 50% and 1kg emulsion paint is applied for 8 square meters, the effective composition of each square meter of wall is about 60g If 50 square meters are applied, the effective composition is only 10g / square meter Such a little coating on the wall, its film thickness is very thin, and the scrub resistance will be greatly reduced to less than 300 times of standard requirements, which will also directly affect the decoration effect and service life 3、 Common quality problems and preventive measures in construction 1 Main causes of bulge and wave: ⑴ the base course is not solid, with dust, oil and loose materials; the base course has high moisture content and large alkalinity (2) be tired of water Because latex paint has certain water permeability, if the coating meets water or humid air, water will enter the base layer from the surface layer, if the putty is not water resistant, it will cause falling off (3) the construction temperature is too low to reach the minimum film forming temperature (+ 5 ℃), because no continuous film is formed (4) the coating is too thick, and the surface of the coating is dry but the inside is not The base course is too dry, resulting in partial demulsification of the coating Prevention measures (1) during the base course treatment, the loose matters on the surface shall be eliminated and the putty with certain strength shall be used for repairing Let the base course dry with moisture content less than 10% and surface pH less than 10% (2) when applying putty, 107 glue or emulsion liquid shall be used to adjust the putty It is not allowed to use only cellulose and old powder to apply putty (3) the construction temperature of emulsion paint shall be above 5 ℃ and shall not be lower than the temperature before film forming (4) if the emulsion paint is too thick, a certain amount of water can be added to dilute it according to the instructions, and one time coating cannot be too much If the base course is too dry, brush it with a small amount of water, and then construct after the surface is dry 2 uneven color, the main reason for flower: latex paint is not evenly stirred, emulsion, filler, uneven color distribution Coating is not enough to cover the bottom, or the thickness of the film is uneven (2) the base course is uneven Due to the effect of light, the flat part of the base course is light in color, and the uneven part is deep (3) the base course is strong in alkalinity, which causes discoloration and blooming of emulsion paint Prevention measures (1) during the construction, the emulsion paint shall be stirred evenly If the emulsion paint is too thin or the covering power is not good, it shall be applied once more (2) the base course shall be leveled with putty and then coated with emulsion paint (3) make the pH value of the base course surface less than 10 before construction If necessary, use the sealer to prevent the leakage of alkaline substances 3 The main reason for powder removal and yellowing is that the construction temperature is lower than the minimum film forming temperature of emulsion paint, and the coating does not form continuous film and is powdered There are many impurities in the emulsion paint, such as the water added is not clean, mixed with other coatings, etc The base course is alkaline, or the emulsion paint is not completely filmed, so the paint is used for decoration The solvent and emulsion paint in the paint work to make the coating yellow During the construction of preventive measures, the temperature shall not be lower than 5 ℃ Prevent sundries from mixing, use clean water to add emulsion paint The preventive measures for pantothene are described above To prevent the paint from yellowing, the paint shall be applied only after the latex paint is finished and the film is formed 4 The main reason for the serious brush marks is that after the water in the emulsion paint evaporates, the paint does not flow flat and has become film, thus leaving the brush marks The following measures can be taken to prevent obvious brush marks: ⑴ improve the technical level of construction personnel; ⑵ the base course should not be too dry; ⑶ the latex paint used in the last coating should be thinner; ⑵ some construction tools, such as wool brush or an imported roller, can also be used for spraying construction, so as to achieve no brush marks Of course, brush marks are also related to construction temperature and humidity In fact, to ensure the construction quality, the construction site management is also the key Only by doing a good job in site management, improving the technical level of construction personnel, and following the standard construction, can we obtain satisfactory results 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,