Part 1 introduction of classification performance of wall coatings
Wall coating refers to the coating used for building wall surface, which plays the role of decoration and protection, makes the wall surface more beautiful and tidy, and also plays the role of protecting the building wall surface and prolonging the service life. At present, there are many kinds of wall paints on the market, which dazzle consumers. In order to choose a high-quality environmental protection wall paint, we need to have a detailed understanding of the wall paint first. Otherwise, if you don't know anything, you will easily be fooled by some unscrupulous vendors.
Wall coatings are divided into four dimensions and various categories.
According to the substrate, it can be divided into organic coating, inorganic coating and organic-inorganic composite coating. Organic coatings include solvent-based, water-emulsion and water-soluble organic coatings. Inorganic coatings include traditional cement, lime, etc. , can be divided into flat coatings with smooth surface, sandy coatings with sandy decorative effect on the surface, multilayer coatings with concave-convex decorative effect, interior wall coatings according to the use area, exterior wall coatings according to the use function, and decorative coatings and special functional coatings (such as fireproof coatings, mildew-proof coatings, waterproof coatings, elastic coatings, etc.). ).
According to different standards, wall coatings can be divided into different categories. Specifically, it can be classified according to four dimensions: base material, decorative effect, use position and use function. A variety of coating categories are derived from the arrangement and combination of four dimensions. Generally, coatings are named according to the substrate and the use area, such as solvent-based exterior wall coatings, water-soluble interior wall coatings and inorganic exterior wall coatings.
Commonly used wall paint latex paint has many advantages.
Latex paint is the main wall paint on the market now, and latex paint is the main choice for most family decoration. Latex paint is a kind of organic paint, which is a water-based paint based on synthetic resin emulsion and added with pigments, fillers and various additives. Compared with other wall coatings, latex paint is more environmentally friendly, and there is no danger of explosion and fire during transportation and storage. At the same time, it has the advantages of convenient construction, fast film drying, good air permeability and good water resistance.
The judgment is based on four performance indexes of wall paint.
There are many indexes to determine the quality of wall paint. The following are four indexes that have great influence on quality: hiding power, adhesion, viscosity and fineness. Knowing these indexes of coatings will have a basis when testing the quality of coatings.
Covering power: refers to the minimum coating amount, expressed in g/m2, when the color coating is evenly coated on the black-and-white grid so that the black-and-white grid no longer appears. The greater the weight, the weaker the hiding power, and the stronger the hiding power means that the amount of paint per unit area is less.
Adhesion: indicates the adhesion between the coating film and the base layer, and the firmness of the coating film and the coated surface through physical and chemical actions. The coated surface can be a bare substrate or a painted substrate. The wall paint with weak adhesion is easy to fall off, which affects the appearance of the wall.
Viscosity: refers to the viscosity of paint, which can be measured by a paint viscosity measuring instrument. Viscosity is an important index of coating performance, which has a great influence on the storage stability, construction performance and film-forming performance of coatings. The paint is too thick to brush easily, and too thin to sag easily, so the viscosity of the paint should be controlled within a certain range.
Fineness: refers to the size and dispersion uniformity of particles in coatings. Fineness directly affects the smoothness, luster and water permeability of the coating surface. Generally speaking, the finer the paint, the more expensive it is.
The second part is the five misunderstandings of buying wall paint.
There are many kinds of wall coatings, and consumers often go astray when buying because they don't understand them. It is a waste of money and delays in construction to buy inappropriate products. For consumers, when buying wall paint, we must be careful and clever to get out of the misunderstanding.
Myth 1: Pay attention to price and ignore quality.
When many people buy wall paint, it is easy to go into the misunderstanding that price is more important than quality. Some people think that the higher the paint price, the better, so they choose the most expensive one, but the experimental results show that this is not the case. On the other hand, in order to save money, the lower the price, the better, saving a lot of money, but the wall quality and indoor environment are worrying in the future. Therefore, it is suggested that you pay attention to the quality of wall paint as much as possible after considering the price, and generally choose a big brand with good reputation.
Myth # 2: Pay attention to packaging, but ignore the inside.
When consumers buy latex paint, it is very necessary to look at the packaging often. However, it should be noted that the packaged coating is not necessarily of excellent internal quality. In order to attract customers, some manufacturers make a big fuss about the packaging of products, deliberately exaggerating the performance and efficacy of products. Therefore, consumers are advised to pay attention to other aspects besides the product packaging, such as the detailed inspection list of the product.
Myth 3: The color card is exactly the same as the wall color.
Many consumers think that the color of paint on the color card is exactly the same as that on the wall, which is a misunderstanding. Because of light reflection and other reasons, after all the four walls of the room are painted, the wall color will look darker than the color card. The color that consumers see on the color card is usually different from the actual color of the paint on the wall. Therefore, it is suggested that when consumers choose colors in color cards, it is best to choose their favorite color number with a slightly lighter color. If they like dark walls, they can adjust them to the same color as the selected color card.
Myth 4: Don't estimate the amount of paint in advance.
Many consumers did not estimate the amount of paint in advance, fearing that they would buy less, and the more they bought, the better. This may cause waste of materials, increase the cost of home improvement, and at the same time, excessive paint accumulation will also have a certain impact on construction safety. Therefore, it is suggested that consumers must see the area of the building area clearly before construction, so as to estimate the amount of materials to be purchased. A relatively simple method to estimate the amount of paint is: the amount of paint required for a layer of paint (L)= (wall area x2.5)/ coating area per liter.
Myth 5: tasteless and environmentally friendly.
Many people judge the safety of wall paint by smell, and think that low-odor or odorless wall paint is environmentally friendly. This is a big misunderstanding. Because odorless coatings can be achieved by adding essence or using low-odor materials, not all odorless coatings are environmentally friendly and non-toxic. The most professional way to judge the environmental protection of wall paint is to see whether its environmental protection index meets the standard. There are three key environmental indicators of wall paint: VOC, free formaldehyde and heavy metals.
The third part is flexible and practical skills of choosing wall paint.
In order to buy high-quality environmentally-friendly wall paint, consumers must keep their eyes open when purchasing. Consumers can make purchases according to the following tips.
1. Purchase through regular channels to check the environmental inspection report.
Choose regular big brand products or formal channels to buy. Paint and coating products are not only related to the beauty and comfort of the living environment, but also to the health of family members, so we should not be careless. Generally, the front of latex paint will be marked with name, trademark, net content, composition, usage and precautions. Pay attention to the production date and shelf life. The shelf life of various brands of latex paints ranges from 1 to 5 years. Try to buy the latest products.
2. Weigh the components and listen to the sound.
Generally speaking, the quality of qualified latex paint is about 7 kg in a barrel of 5 liters, and about 25 kg in a barrel of 18 liters. Whether it is qualified or not can be judged by weighing the paint bucket. Another simple way is to lift the paint bucket. Regular brand latex paint generally can't hear the sound when it is shaken, and it is easy to shake the sound, which proves that the viscosity of latex paint is insufficient.
3. Four ways to open cans by hand.
A look at the water quality solution shows that the high-quality latex paint is viscous, milky white liquid, without caking, even after stirring, without peculiar smell; Second, look at wire drawing. Take a brush and dip it in latex paint, which will make the wire hang for a long time and fall evenly. Try to feel it with your fingers. Authentic latex paint should feel smooth and delicate. Four smells, most non-environmental protection paints have pungent smell, smell whether there is pungent smell in the paint.