There are many kinds of latex paints, and the formulas of different manufacturers are different. The production process is different, so its performance and decorative effect are very different. What kind of latex paint is used for decoration? This is a question people often ask.
At present, there are a large number of imported latex paints on the market, and the price is 40-50 yuan/kg. The general reasonable amount is 5 square meters/kilogram, just the wall coating fee is 8-10 yuan / square meter, plus the construction fee and other costs, generally about 20 yuan per square meter, a set of 60 square meters The two bedrooms and one living room need 3000-4000 yuan. Due to the thin coating of latex paint on the wall surface, the surface strength is not high, and it is easily damaged by hard objects such as tables and chairs. Although it can be scrubbed with a damp cloth after scorching, it will still leave slight marks. Therefore, it is considered that high-grade paint is selected. It will be a wrong idea to be able to keep it intact once and for all. The author believes that foreign paints are superior to home-made latex paints only in terms of advection, fineness and color matching, and some foreign latex paints are still produced domestically. Domestic emulsions are used, so there is no need to adopt foreign products when selecting latex paints. In fact, the domestic latex paint and the indicators are also quite good, and the price is only 1/2 or 1/3 of the "foreign paint", so when decorating the room, choose a cheap and affordable home-made latex paint is appropriate.
In the decoration process, latex paints should also be selected from three perspectives:
1. Decorative effect
The role of latex paint is mainly decorative, decorative effects in addition to the overall design, color selection, and latex paint performance is also a considerable relationship. The leveling, coloring, light type, and feel of latex paint directly affect the decorative effect.
2. Select latex paint according to site of use
Based on the requirements of different places for the performance of latex paint, it is the main basis for selecting latex paint. Such as: hotels, restaurants and some of the more demanding office building decoration, generally use high-end varieties. In places with low requirements such as ordinary offices and factories, ordinary latex paint can be used. Underground engineering, kitchens, toilets, floor and other places requiring higher water resistance should choose good waterproof latex paint.
3. Investment cost is the basis for choosing latex paint
Obviously, the cost of the product determines the quality of the product. However, it is also necessary to analyze the situation according to the specific circumstances. For example, if the economy does not allow it, it can be used together. In general, the walls are prone to dampness, and the environment that requires scrubbing can be easily soiled. High-grade latex paints can be used. The top surface can be made of ordinary latex paint. For home decoration, the living room is easily defaced, and the kitchen and toilet have high humidity. The use of scrub-resistant, waterproof, high-grade latex paint and common latex paint in the bedroom are also required. Of course, if the economy allows, the same type of material can also be used to maintain overall consistency.
two. How to ensure construction quality
The paint film formed by latex paint is different from paint. It is porous and breathable, and has a certain alkali resistance. It can be painted on a base that has been initially dried and returned to white, and a small amount of water in the base layer can be used. Through the outward migration and scattering of the coating film, the top of the coating film is not damaged, and the coating film is dried quickly. The interval between the two passes during construction is only a few hours. These characteristics are very favorable for accelerating the construction progress and shortening the construction period.
One of the main advantages of latex paints is that the leveling properties are particularly good. Construction according to the construction specifications ensures that the surface is fine and clean, such as porcelain. Because the surface layer is only 0.1mm thick, it is necessary to treat the base layer well, requiring the base layer to have sufficient strength, no powdering, and sanding. At the same time, the flatness of the grass-roots level is also very high. Otherwise, the fine and smooth advantages of latex paints are not shown. Therefore, the grass-roots layer needs to be polished three times before the brushing, and then the roller paint is applied twice to ensure the construction. quality.
Some construction workers have to save materials, easy to construct, and add water to latex paints, which is not allowed by economical latex paints. Some high-grade latex paints can be mixed with water, some are concentrated, some have good hiding power, and some have excellent scrubbing performance. However, this does not mean that unlimited water can be added, and the area of ​​brushing can be expanded without limit.
Assuming that the latex paint has a solid content of 50% and 1 kg of latex paint is applied to 8 square meters, the effective composition per square meter of wall surface is about 60 g. If the paint is applied to 50 square meters, the effective composition is only 10 g/m2. Such a coating on the wall, the coating film thickness is very thin, the scrub performance will be greatly reduced and can not reach the standard requirements of 300 times, it will inevitably directly affect the decorative effect and the service life.
three. Common quality problems and preventive measures in construction
1. Drums and waves
main reason:
(1) The grassroots is not strong, with dust, oil traces and loose material; the base layer has a high moisture content and is alkaline.
(2) It is not water resistant. Because latex paint has a certain degree of water permeability, if the coating is exposed to water or moist air, the water will enter the ground layer from the surface layer. If the putty is not resistant to water, it will cause shedding.
(3) The construction temperature was too low to reach the minimum film formation temperature (+5°C) because no continuous film was formed.
(4) The coating is too thick and the coating surface is dry and the inside is dry. The base is too dry, causing partial demulsification of the coating.
Preventive measures
(1) When the base layer is treated, the surface loose material is removed and repaired with a putty with a certain strength. Let the base layer dry, the moisture content is less than 10%, and the surface pH is less than 10.
(2) When applying putty, use 107 glue or emulsion to adjust putty, must not use only cellulose and old powder approved putty.
(3) The construction temperature of latex paint is above 5°C, and it cannot be lower than this temperature before film formation.
(4) If the latex paint is too thick, it can be diluted with a certain amount of water as specified in the specification. If the grass is too dry, use a small amount of water to paint it thinly and dry it.
2. Uneven color, hair flowers
main reason
(1) Latex paint does not mix well, and the emulsion, filler, and color are not evenly distributed. The amount of coating is not enough, the bottom is not covered, or the coating thickness is uneven.
(2) The grass-roots level is not even. Due to the effect of light, the grass-roots level has a lighter color and the unevenness appears deeper.
(3) Strong alkaline base, causing latex paint discoloration hair.
Preventive measures
(1) During construction, the emulsion paint should be fully mixed. If the latex paint is too thin or has poor hiding power, it should be painted again.
(2) The base should be flattened with putty and then painted with latex paint.
(3) Let the surface of the grass-roots surface with a PH value of less than 10 before construction. If necessary, use a primer to prevent alkaline substances from seeping out.
3. Decolorization, yellowing
main reason
The construction temperature is lower than the minimum film forming temperature of the latex paint, and the coating does not form a continuous film and powder.
Latex paint is mixed with more impurities, such as adding water is not clean, mixed with other coatings.
Alkaline basalt, or emulsion paint has not been completely filmed, it is decorated with paint. The solvent and latex paint in the paint work to make the coating yellow.
Preventive measures
During construction, the temperature should not fall below 5°C.
Prevent impurities from mixing in. Use clean water to add latex paint.
The prevention measures for efflorescence have been described above. Prevent paint from yellowing as long as latex paint finishes and then paint.
4. Severe brush marks
The main cause of the obvious brush marks is that after the water in the latex paint is volatilized, the paint is too late to be leveled and the film is formed, leaving behind traces of the brush. The following measures can be taken to prevent brush marks:
(1) Improve the technical level of construction workers;
(2) The base layer should not be too dry;
(3) The latex paint used for the last coating should be thin;
(4) The use of some construction tools, such as construction with a wool brush or an imported drum, may also be applied by spraying, so that no brush marks are actually achieved. Of course, the brush mark is also related to the construction temperature, humidity, etc.
In fact, to ensure construction quality, site management of construction is also key. Only by doing a good job of on-site management, improving the technical level of construction workers, and following the standard construction can we obtain satisfactory results.
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