One is a low-grade water-soluble coating, which is made by dissolving polyvinyl alcohol in water and adding other additives such as pigments. In order to improve its performance and reduce its cost, many measures have been taken. The main products are 106 and 107803 interior wall coatings. The disadvantage of this kind of coating is that it is not resistant to water and alkali, and the coating is easy to peel off after being wetted. It belongs to low-grade interior wall coating and is suitable for general interior wall decoration. This kind of coating has the advantages of low price, non-toxic and tasteless, and convenient construction. Dry cleaning can't remove powder. Because its film-forming substance is water-soluble, it will always leave some traces after scrubbing with a wet cloth, which is not durable and easy to yellow and change color. However, it is cheap and convenient to build. At present, its consumption is still the largest, accounting for about 50% of the market, and it is mostly used for interior wall decoration of middle and low-grade rooms or temporary rooms.
The second type is latex paint, which is made of water as the medium, aqueous solution of acrylate, styrene-acrylic polymer and vinyl acetate polymer as the film-forming substance, and various auxiliary ingredients are added. The film-forming substance is insoluble in water, and the water resistance and weather resistance of the film are greatly improved compared with the first one, leaving no trace after wet scrubbing, and there are different decorative types such as flat light and high light. At present, the decorative effect is similar to that of 106 because of the few colors. In fact, these two kinds of coatings are not of the same grade at all, belonging to middle and high-grade coatings. Although the price is relatively expensive, it occupies an increasing market share because of its excellent performance and decorative effect. A good latex coating has good water resistance, alkali resistance and washing resistance, and the coating will never peel off after being wetted. Generally speaking (under the same conditions of pigment, volume and concentration), styrene-acrylic latex paint has better water resistance, alkali resistance and scrub resistance than ethylene-propylene latex paint, and ethylene-propylene latex paint is better than polyvinyl acetate latex paint (commonly known as latex paint).
The third is the colorful paint which is very popular at present. The film-forming substance of the coating is nitrocellulose, which is dispersed in the water phase in the form of oil in water, and a variety of color patterns can be formed by spraying once.
In recent years, another kind of fangci paint belongs to the fourth category. Its decorative effect is exquisite, smooth and elegant, and its price is not high, but its construction technology is complicated and its wet rubbing resistance is poor.
Second, how to judge the quality of latex paint
After opening the lid, the truly environmentally friendly latex paint should be water-based, non-toxic and tasteless, so it is not an ideal choice for users who smell pungent or industrial essence. After a period of time, genuine latex paint will form a thick elastic oxide film on its surface, which is not easy to crack, while defective products will only form a thin film, which is fragile and has a spicy smell. Stir the latex paint evenly with a wooden stick, and then pick it up with a wooden stick. When high-quality latex paint flows downwards, it will form a fan shape. Touch with your fingers, genuine latex paint should feel smooth and delicate. Real latex paint has no irritating smell, while the low-grade water-soluble paint of fake latex paint may contain formaldehyde, so it has a strong irritating smell.
Secondly, you can brush a small amount of paint on the cement wall, and the paint can be scrubbed with a wet rag after drying. The real latex paint has strong scrubbing resistance, and the appearance of the coating will not be obviously affected after scrubbing for one or two hundred times, while the low-grade water-soluble paint will lose powder and fade after scrubbing for more than ten times. Latex paint is brushed on the wall, and the authentic color is as bright as new.
Look at the ingredients when buying. The composition of high-quality coatings should be * * * poly resin or pure acrylic resin. Don't forget to look at the shelf life of the product.
Third, why is latex paint much better than solvent-based coatings?
Latex paint is a water-based paint, and its film performance is much better than that of solvent-based paint. The organic solvent, which accounts for half of solvent-based coatings, is replaced by water here, so the toxicity problem of organic solvents is basically solved by latex paint. Latex paint is made of some polymer aqueous solutions. In addition to water and different types of polymers or safe and harmless polymers, it also contains a small amount of emulsifier and a small amount of unpolymerized free monomers. Free monomers are small molecules that can be volatilized, and there are different degrees of toxicity problems. At present, the concentration of free monomer in environmental protection paint is controlled below 0. 1%, and the dosage of additives is 2% to 3%. Less than 0.05% to 0. 1%. At present, the concentration of toxic free monomer and the dosage of additives in inferior latex paint exceed the standard by dozens or hundreds of times, which affects health. Now the commonly used Nippon paint and Dulux paint have reached the specified environmental protection standards and are safe. At present, there are many brands of latex paint on the market, and the import and domestic products are neck and neck, and the competition is fierce. Domestic brands with guaranteed quality and good reputation are Red Lion and Crane. Imported brands include Dulux, Nippon Paint and Levi Paint. The washability of these brands is generally not less than 300 times, and some are as high as 2000 times. If the imported brand is a "green product", there is an international certification mark on the outer packaging, such as the German "Der Blaue Engel" mark; Domestic products can only be called "green products" if they have the words "products certified by China Environmental Label Product Certification Committee".
Four. Comparison between imported latex paint and domestic latex paint
At present, latex paint imported from shopping malls belongs to high-grade and high-priced coatings. Only slightly better than domestic latex paint in leveling, fineness, color matching and can-opening state, other indicators are comparable, but the price is 1-2 times higher than domestic latex paint. Some users have misunderstood the propaganda of imported latex paint, for example, 1 kg can be painted more than 8 square meters, which is intended to tell people that the cost per square meter is not more expensive than that made in China. But 1 kg is impossible to brush such a large area. If the coating is too thin, other properties will be difficult to guarantee. General 1 kg paint brush 5 square meters is not too small. Moreover, some imported latex paints are actually produced by domestic joint ventures and bear the trademarks of foreign companies. And there are many domestic latex paints with good quality, but the price is much lower than that of imported paint, which is more suitable for ordinary families. It is best to choose interior wall latex paint for home decoration.
5. How to choose latex paint according to different coating parts?
The role of latex paint is very important, and latex paint should be selected according to different parts of painting. For example, latex paint for bedroom and living room walls requires strong adhesion, delicate texture, good differentiation resistance and good air permeability; Kitchen and bathroom latex paint should be waterproof, mildew-proof and easy to wash. Polyvinyl acetate (commonly known as latex paint) can be used in the bedroom, but coatings with stronger scrub resistance should be used in kitchen, bathroom, balcony ceiling and other parts that are easy to get wet. What should be paid attention to in the construction of strong ethylene propylene latex paint or styrene propylene latex paint?
Before the construction of latex paint, the wall surface must be properly treated, otherwise serious problems such as peeling, cracking and foaming will occur after the latex paint is painted. At present, many people still use 82 1 putty in construction. In fact, 82 1 putty is very water-resistant. When there is water on the wall, 82 1 putty will absorb water and foam, which will cause latex paint to foam and fall off in a large area. Moreover, the better the performance of latex paint, the better the film-forming property and the more serious the problem. Therefore, when using latex paint, the above problems can be avoided by first sealing the wall with the back cover and then using water-resistant putty.
Emulsioni paint should be mixed evenly during construction, especially when colorful products are used. If the mixing is not uniform, the dispersion of the color paste in the coating is unstable or the color paste will precipitate after long-term storage. At this time, the construction will cause frost on the decorative surface, which will seriously affect the decorative effect.
In addition, whether and how much water can be added to latex paint construction must be strictly in accordance with the provisions of the manufacturer. Because some manufacturers have fully considered the various needs of users when designing and developing latex paint, they have designed a variety of formulas. Some latex paints do not need to be added with water during construction, but adding water destroys various properties of latex paints.
Pay attention to brush coating, roller coating and spraying during construction. Both methods can achieve the expected effect, but the viscosity of latex paint needs to be adjusted, so that it is easy to brush during construction, and there is no obvious brush mark after brushing. If the viscosity is too high, the brush marks will be obvious, and if the viscosity is too low, it will easily lead to the disadvantages of slag flow and poor hiding power.
After the construction is completed, the tools should be cleaned with water in time, otherwise it is difficult to clean the latex paint after drying due to the water resistance of the paint film.
7. Can the exterior wall paint brush the interior wall?
Experts said that from the perspective of environmental protection, it is no problem to paint the interior wall with exterior wall paint, but interior wall paint does not have to be used to paint the exterior wall.
Reportedly, latex paint for interior and exterior walls has its own special requirements. Exterior wall latex paint is used to paint the facade of a building, so the most important index is ultraviolet protection, and it should not change color after long-term irradiation. Interior wall coatings are used for indoor wall painting, and the requirements for ultraviolet resistance are far lower than those for exterior wall coatings. Interior wall latex paint requires high scrubbing resistance, and it is easy to dirty the wall in home life, so it can be wiped with water at any time.
The external wall shall be waterproof and self-washing. The paint film should be hard and flat, and the dirt will come off as soon as it is washed. The elasticity of exterior wall coatings is very important. Elasticity can prevent cracking caused by temperature and climate change.
Exterior wall paint can be used for interior wall painting, because it also has water resistance, while interior wall paint does not have sun resistance, so it cannot be used for exterior wall painting, but experts suggest that it is better to use it exclusively.
Exterior wall coatings and China have the same requirements for environmental protection. People ask whether exterior wall coatings can be used to paint interior walls, mainly out of concern for environmental protection, fearing that low environmental protection index in exterior wall coatings will cause indoor air pollution. In fact, as long as it is latex paint, whether it is interior wall paint or exterior wall paint, there is no knowledge of polluting walls and putty. Compared with putty, wall lining is the best substitute for 82 1 putty, and its key raw materials are imported products. There is obvious difference between wall lining and 82 1 putty.
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