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One type is the low-grade water-soluble coating, which is made by dissolving polyvinyl alcohol in water and adding other additives such as pigments. To improve its performance and reduce costs to take a variety of ways, many brands, the main products are 106,107,803 interior paint. The disadvantage of this coating is that it is not resistant to water and alkali, and the coating is easily peeled off after being exposed to moisture. It is a low-grade interior wall coating and is suitable for general interior wall decoration. This type of paint has the advantages of low price, non-toxic, odorless, and convenient construction. Dry wipe can not afford powder, because its film is water-soluble, so with a damp cloth after scrubbing always leave some traces, durability is not good, easy to yellow discoloration, but its cheap, the construction is also very convenient, The consumption is still the largest, accounting for about 50% of the market, and it is mostly used for the decoration of interior and interior walls in mid- and low-end homes or temporary residences.
The second type is latex paint, which is a kind of water-based medium and is made of an aqueous solution of acrylic esters, styrene-acrylic ester copolymers, and vinyl acetate polymers. It is made by adding a variety of auxiliary components. The film forming material is insoluble in water, and the water resistance and weather resistance of the coating film are greatly improved compared with the first type, and no trace is left after the wet scrubbing, and there are different decorative types such as plain light and high light. Due to its low color, the decorative effect is similar to that of 106 types. In fact, these two types of coatings are not a grade at all. They are medium-to-high-grade coatings. Although the prices are relatively expensive, due to their excellent performance and decorative effects, they occupy a larger and larger market share. A good latex paint layer has good water, alkali, and scrub resistance, and the coating will never peel off after it has been wet. In general (under the same conditions of pigment, volume, and concentration), styrene-acrylic emulsion paint is better than EPR paint in water resistance, alkali resistance, scrub resistance, and ethylene-propylene emulsion paint than polyvinyl acetate latex paint (known as latex paint). it is good.
The third category is a colorful paint that is currently very popular. The film-forming material of the paint is nitrocellulose, which is dispersed in the water phase in the form of oil-in-water. A single spray can form multiple color patterns. In recent years, there has been a fourth type of imitation ceramic coating. Its decorative effect is delicate, smooth, elegant, and the price is not high, but the construction process is complicated and the wet rub resistance is poor.
Second, how to judge the quality of latex paint
After opening the lid, the truly environmentally-friendly emulsion paint should be water-based, non-toxic and odorless, so if the user smells pungent or industrial flavor, it is not ideal. After a period of time, the surface of genuine latex paint will form a very thick and elastic oxide film, which will not be easily cracked, while inferior products will only form a very thin film that is fragile and has a spicy smell. Mix the latex paint with a wooden stick and pick it up with a wooden stick. The high-quality latex paint will become fan-shaped when it goes down. Touch with your finger, genuine latex paint should feel smooth and delicate. Real latex paint does not have a pungent odor, and the low-grade water-soluble coating of counterfeit latex paint may contain formaldehyde and therefore has a strong pungent taste.
Secondly, a small amount of paint can be brushed onto the concrete wall. After the coating is dry, it can be scrubbed with a wet rag. The real latex paint has strong scrub resistance. Rubbing one or two hundred times does not have a significant effect on the appearance of the coating. The coating only wiped more than ten times, which resulted in the discoloration of powder and exposed bottom. The latex paint is applied to the wall and the genuine color is as bright as new. When looking at the ingredients when purchasing, the composition of the high-quality coating should be a copolymer resin or a pure acrylic resin. Don't forget to look at the product's shelf life.
Third, why latex paint is much better than solvent-based paint
Latex paints are water-based paints. Their paint film performance is much better than that of solvent-based paints. Half of the organic solvents that make up solvent-based paints are replaced by water. Therefore, the toxicity of organic solvents is basically solved by latex paints. . Latex paint is made of membranes of some aqueous polymer solutions. Besides water and safe and harmless different types of polymers or polymers, it also contains small amounts of emulsifiers and traces of unpolymerized free monomers. The free monomers are Some volatile small molecule substances have different degrees of toxicity problems. Now the concentration of free paint in environmental protection paint is controlled at 0.1% or less, and the amount of additives used is 2% to 3%; the less is only 0.05% to 0.1%. %between. The toxic free monomer concentration of the poor quality latex paint and the dosage of the auxiliary agent exceed tens or hundreds of times, affecting health. The commonly used CRC, Nippon, and Dulux paints that have reached the prescribed environmental standards are safe. At present, there are many brands of latex paint on the market, and imports and domestic production go hand in hand, and the competition is fierce. The quality-guaranteed and well-reputed domestic brands are China Resources Paint, Love Paint, Mei Tushi, etc.; the imported brands are Dulux, Nippon Paint, Valspar, etc. The washability of these brands is generally not less than 300 times, and some are up to 2000 times. If the imported brand is a "green product", there is an international certification mark on the outer packaging, such as Germany is the "blue sky to make" sign; domestic products must have the "China Environmental Labeling Product Certification Committee certified product" can be called "green product."
Fourth, the comparison of imported latex paint and homemade latex paint
At present, imported latex paint is a high-grade, high-priced paint on the market. It is only slightly superior to domestic latex paint in leveling, fineness, color matching and canning. Other indicators are comparable, but the price is 1-2 times higher than domestic latex paint. Some imported latex paints have misunderstood propaganda, such as 1 kg brushing more than 8 square meters, which is intended to tell people that the cost per square meter is not more expensive than domestic ones. But 1 kilogram is impossible to brush such a large area. The coating is too thin and other properties are difficult to guarantee. Generally 1 kilogram of paint brush 5 square meters is not much less. Moreover, some imported latex paints are actually produced by domestic joint ventures and are affixed with the trademarks of foreign companies. The domestic latex paint also has a lot of good quality, the price is much lower than the imported paint, for the average family, more applicable. Home interior decoration is best to use interior latex paint.
How to choose latex paint according to different parts of brushing
The function of latex paint is very important. It is necessary to select the latex paint according to different parts of the brushing. For example, the latex paint used in the walls of bedrooms and living rooms requires strong adhesion, delicate texture, good resistance to differentiation and breathability, and kitchen and bathroom facilities. Latex paints should have waterproof, mildew-proof and washable properties. Bedrooms use polyvinyl acetate (commonly known as latex paint), but kitchens, toilets, and balcony roofs that are prone to moisture should be chosen for scrub-resistant coatings, strong ethylene-propylene or styrene-acrylic latex paints.
Sixth, construction should pay attention to what
Before the construction of latex paint, the wall surface must be handled well. Otherwise, the emulsion paint will cause serious problems such as shedding, cracking and foaming. Now many people work, putty still use 821 putty, in fact 821 putty is not water, when the wall contains water, 821 putty will bubbling, resulting in a large area of ​​latex paint blistering, shedding. And the better the performance of the latex paint, the better the film formation and the more serious the problem. Therefore, when using latex paint, use a back cover to seal the wall and then use a water-resistant putty to avoid the above problems.
In the construction of latex paint, it should be evenly mixed. Especially when using colorful products, if the mixing is not uniform, when the color paste in the coating is not stable or the color paste is precipitated after long-term storage, the construction will cause the finish. Flowering, seriously affect the decorative effect.
In addition, the construction of latex paint can add water and the amount of water, must be in strict accordance with the provisions of the manufacturers. Because some manufacturers in the design and development of latex paint, has fully taken into account the various needs of users, designed a variety of formulas, some latex paint in the construction without adding water, add water but break the various properties of latex paint.
Note that brush, roller, and spray processes can be used during construction. Either of these methods can achieve the desired results, but the viscosity of the latex paint needs to be adjusted so that the viscosity can be easily applied during construction and no significant after brushing. Brush marks are appropriate. Too much viscosity of the brush mark is obvious, the viscosity is low, it is easy to cause slag, poor hiding power and other ills.
After the construction is completed, the tools should be cleaned with water in time. Otherwise, after the latex paint dries, it will be difficult to clean due to the water resistance of the paint film.
Seven, exterior wall paint can brush the interior wall
According to experts, the external wall paint brush interior wall, no problem from the environmental point of view, and the interior wall paint used to brush the exterior wall is not necessarily OK. According to reports, interior and exterior latex paints have their own special requirements. Exterior latex paint is used to paint on the facades of buildings. Therefore, one of the most important indicators is anti-ultraviolet radiation, and it will not change color if it reaches a long time irradiation. The interior wall paint is used for interior wall painting, and the requirement for resisting ultraviolet rays is much lower than that of the exterior wall paint. The interior wall latex paint has high resistance to scrubbing performance, and it is easier to contaminate the wall in home life and can be wiped with water at any time.
The exterior wall requires water resistance and requires self-cleaning. The film must be hard, smooth, and dirty. The elasticity of interior and exterior wall paints is very important, and elasticity can prevent cracking caused by temperature and climate change.
External wall paint can be used for interior wall brushing because it also has water resistance, while interior wall paint does not have anti-sun function, so it can not be used to paint the exterior wall, but experts suggest that it is still special for special purposes. Internal and external wall paints have the same requirements for environmental protection. People have raised the question of whether exterior paint can be used to paint interior walls. The main concern is environmental issues. They are concerned about the low environmental protection indicators of exterior paint and cause indoor air pollution. In fact, as long as it is latex paint, no matter whether it is interior wall paint or exterior wall paint, there is no pollution.
First, the current interior decoration interior wall coatings are those types