1. What kinds of interior wall paints are there at present?
One kind is low-grade water-soluble paint, which is made by dissolving polyvinyl alcohol in water and then adding pigments and other additives. In order to improve its performance and reduce the cost, many ways have been taken, and the main products are 116 and 117813 interior wall coatings. The disadvantage of this kind of coating is that it is not water-resistant and alkali-resistant, 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, odorless and convenient construction. Dry wiping can't remove powder. Because its film-forming substance is water-soluble, it always leaves some marks after scrubbing with wet cloth, which is not durable and easy to yellow and discolor. However, it is cheap and convenient to construct. At present, its consumption is still the largest, accounting for about 51% 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-acrylate polymer and vinyl acetate polymer as the film-forming substance, and various auxiliary components 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 type, leaving no trace after wet scrubbing, and there are different decorative types such as flat light and high light. At present, because of its few colors, the decorative effect is similar to that of Class 116. In fact, these two kinds of coatings are not the same grade at all, and belong to middle and high-grade coatings. Although the price is relatively expensive, they occupy an increasing market share because of their 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 scrubbing 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 category is the colorful paint which is very popular at present. The film-forming substance of this paint is nitrocellulose, which is dispersed in the water phase in the form of oil-in-water.
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 the cover is opened, the truly environmentally friendly latex paint should be water-based, nontoxic and tasteless, so it is not an ideal choice for users to smell pungent or industrial essence. After a period of time, the surface of genuine latex paint will form a thick elastic oxide film, which is not easy to crack, while the defective product will only form a thin film, which is fragile and has a spicy smell. Mix the latex paint evenly with a wooden stick, and then pick it up with a wooden stick. When the high-quality latex paint flows downwards, it will form a sector shape. Touch with your fingers, genuine latex paint should feel smooth and delicate. The 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, a small amount of paint can be brushed 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 being scrubbed for one or two hundred times, while the low-grade water-soluble paint will lose powder and fade after being scrubbed for more than ten times. When latex paint is painted on the wall, the authentic color is as bright as new.
Look at the ingredients when purchasing. The ingredients 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 latex paints are much better than solvent-based paints
Latex paints are water-based paints, and their film properties are much better than solvent-based paints. The organic solvent that accounts for half of solvent-based paints is replaced by water here, so the toxicity of organic solvents is basically solved by latex paints. Latex paint is made of some polymer aqueous solutions. In addition to water and different types of polymers or polymers that are safe and harmless, it also contains a small amount of emulsifier and a small amount of unpolymerized free monomers. Free monomers are small molecules that can volatilize, and there are different degrees of toxicity problems. At present, the concentration of free monomers in environmental protection paint is controlled below 1.1%, and the dosage of additives is 2% to 3%. Less than 1.15% to 1.1%. 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 Kelan. Imported brands are Dulux, Nippon Paint, Levi Paint, etc. The washing resistance of these brands is generally not less than 311 times, and some are as high as 2111 times. If the imported brand is a "green product", there is an international certification mark on the outer packaging, for example, Germany is the "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".
iv. comparison between imported latex paint and domestic latex paint
at present, imported latex paint in shopping malls belongs to high-grade and high-priced coatings. It is only slightly better than domestic latex paint in leveling, fineness, color matching and can-opening state, and other indicators are comparable, but the price is 1-2 times higher than domestic latex paint. Imported latex paint has some misleading propaganda, such as 1 kg can be brushed 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 it is impossible to brush such a large area with 1 kg. If the coating is too thin, other properties will be difficult to guarantee. Generally, it is not less to brush 5 square meters with 1 kg of paint. Moreover, some imported latex paints are actually produced by domestic joint ventures and labeled with 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 paints, which is more suitable for ordinary families. It is best to choose interior wall latex paint for home decoration.
V. How to choose latex paint according to different parts of painting
The function of latex paint is very important, and latex paint should be selected according to different parts of painting. For example, the latex paint used on the wall of bedroom and living room requires strong adhesion, delicate texture, good differentiation resistance and air permeability; Latex paint for kitchen and bathroom should be waterproof, mildew-proof and easy to wash. The bedroom can be made of polyvinyl acetate (commonly called latex paint), but the parts of the kitchen, toilet and balcony ceiling that are easy to be affected with damp should be selected with more scrub-resistant paint. What should be paid attention to in the construction of strong ethylene propylene or styrene propylene latex paint?
before the construction of latex paint, the wall surface must be well treated, otherwise the latex paint will cause serious problems such as peeling, cracking and foaming after painting. Nowadays, many people still use 821 putty in construction. In fact, 821 putty is very water-resistant. When the wall contains water, 821 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 emulsion paint, first use the back cover to seal the wall, and then use water-resistant putty to avoid the above problems.
latex paint should be evenly mixed during construction, especially when brightly colored products are used. If it is not evenly mixed, when the dispersion of color paste in the coating material is unstable or the color paste is precipitated after long-term storage, the construction will cause the decorative surface to bloom, 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 manufacturer's regulations. Because some manufacturers have fully considered the various needs of users when designing and developing latex paints, they have designed a variety of formulas. Some latex paints do not need to add water during construction, but add water to destroy the various properties of latex paints.
note that brush coating, roller coating and spray coating can be used in construction. Either method can achieve the expected effect, but it is necessary to adjust the viscosity of latex paint. The viscosity should be easy to brush during construction and there is no obvious brush mark after brushing. If the viscosity is too high, the brush marks are 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, the tools should be washed with water in time, otherwise it will be difficult to clean the latex paint after drying due to the water resistance of the paint film.
7. Can exterior paint paint the interior wall?
According to experts, it is no problem to paint the interior wall in exterior paint from the perspective of environmental protection, but it is not necessary for interior wall paint to be used to paint the exterior wall.
According to reports, interior and exterior wall latex paints have their own special requirements. Exterior wall latex paints are used to paint the facade of buildings, so the most important indicator is the resistance to ultraviolet radiation, and it is necessary to achieve long-term irradiation without discoloration. The interior wall paint is used for indoor wall painting, and the requirements for ultraviolet resistance are much lower than those in exterior paint. Latex paint for interior wall 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 requires water resistance and self-washing. The paint film should be hard and flat, and the dirt will come off as soon as it is washed. Elasticity in exterior paint is very important. Elasticity can prevent cracking caused by temperature and climate change.
exterior paint can be used for interior wall painting because it also has water resistance, but interior wall paint does not have sun resistance, so it can't be used for exterior wall painting, but experts suggest that it is better to use it exclusively.
China and exterior paint have the same requirements for environmental protection. People put forward the question whether exterior paint can be used to paint interior walls, mainly because they are concerned about environmental protection, and they are worried that the low environmental protection index in exterior paint will cause indoor air pollution. In fact, as long as it is latex paint, whether it is interior wall paint or exterior paint, there is no pollution of wall lining and putty knowledge. Compared with putty, wall lining is the best substitute for 821 putty, and its key raw material is imported products. There are obvious differences between wall lining and 821 putty.
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