The more expensive the function, the more expensive the insider explains the basic function of the paint

Recently, Mr. Yao, who will soon be renovating his readers, told the Beijing-based editorial department that he was troubled by the selection of the interior wall paint: the function of the paint product was too much, cracking, waterproofing, alkali resistance, mildew resistance, and a net smell. Adsorption of formaldehyde and other additional functions. The Purchasing Guide was awful and he was still in the fog. For this reason, he wanted to know if the various functions of the paint had any practical effect. It was not that they had not promoted the "ultra-low VOC" paint and "not environmental protection". With his doubts, the Jinghua household reporter conducted a survey. Experts also pointed out that some of the paint's propaganda “is a gimmick”.

The more expensive the function, the more expensive. Recently, the Jinghua Household Reporter visited a number of brand paint stores on a certain building materials market in the Southwest Fourth Ring as a consumer. It was found that the interior wall paint function of the merchant's publicity was indeed more. Anti-alkali, waterproof, anti-crack, anti-mildew is a function covered by reporters' basic wall paint, and some of these products also have the additional function of odor absorption and formaldehyde absorption. Some products also claim to be formaldehyde-free, ultra-low VOC, or unattended to add VOCs, which can achieve immediate brushing and live-in effect, to show that products are safer and more environmentally friendly.

The reporter learned that the price of paint also rose with the increase in product features. Taking a well-known paint brand as an example, the price of wall paint that absorbs formaldehyde is increased by nearly RMB 100 per barrel compared to low-cost wall paints that contain only basic functions such as alkali resistance, water resistance, crack resistance, and mold resistance.

The insider details the basic functions For the home improvement project, what are the practical significance of these basic functions of coatings? Need these features in home improvement projects? The Jinghua Household Reporter invited a senior engineer working on a wall paint brand to answer these questions.

Waterproof: The most important performance of the waterproof performance is to use a semi-wet rag to wipe the paint, and poor waterproof paint will fade. If the paint is applied to places where the water vapor is heavy, such as kitchens and bathrooms, the waterproof property can prevent the wall paint from dusting.

Anti-alkali: It is very important that the coating has anti-alkali, because the concrete material of the wall is very alkaline, and anti-alkali will appear after painting the wall paint on the wall to make the wall paint become flower. Although the wall will be treated with a putty, the waterproof putty that is used now has a high alkaline pH of more than 10, so the anti-alkali function is very necessary.

Anti-mildew: Although the north is relatively dry, mildew in the wall can also occur under certain conditions. For example, there is a phenomenon of condensation on the wall, in the humidity of more than 70%, the temperature reached 25 °C when the mold will appear. The use of wall paints with mildew resistance on such walls can reduce the chance of mildew, but it cannot be completely eliminated.

Crack resistance: The main defense is the cracking of the paint surface due to shrinkage, which should be the basic function of a qualified product. As for the coating with crack resistance, it can cover small cracks on the wall. The insider points out that this function is mainly reflected in the secondary decoration of the old house, and can cover up very minute cracks without completely eradicating the putty layer. Live, but it can play a very limited role. In the new house renovation, the wall completely re-treatment, this performance of the anti-crack paint is no use.