Reader: The wall of the house has a small pothole after the paint is finished, but the wall surface is smoothed and the pit is only after the paint is finished. Is this related to the quality of the paint?
There is no relationship between the small pits on the wall and the paint, mainly caused by the unprocessed wall base. Many owners believe that after painting, all kinds of small pits on the wall can be made up. In fact, even if the primer is completely brushed twice, the thickness of the coating is less than 2 mm, and the thickness is completely insufficient. To make up for covering the small pit.
There are two main reasons for the appearance of small pits on the wall. The last layer of the base layer of the wall is putty. When the putty is unevenly mixed, there will be particles. These particles will fall off during the later grinding, resulting in small pits. In addition, due to the characteristics of the putty itself, gas is generated after stirring with water, so the putty after stirring is allowed to stand for about half an hour, the gas is fully generated, and then the gas is released by stirring. If it is not used after being stirred and used directly, the gas generated will eject a small bubble inside the wall, and after a sanding, a small pit will appear.
For whatever reason, these pits cannot be observed after grinding because there is a lot of sanding dust in it. It only appears after sweeping the wall and brushing the primer for the first time. Therefore, the experienced oil union finds the pit after brushing the primer, then fills the pit with the putty and the primer, and then smoothes it after drying, and then continues to brush the topcoat twice.
As to whether there are small pits on the wall, it is unqualified construction, and the industry has relevant standard specifications. Due to the inevitability of the material and the accuracy of the construction, for ordinary decoration, it is required to stand at a height of 1.5 meters from the wall. If the obvious pit is not visible, if it is a well-decorated house, it needs to stand 1 meter away from the wall. At the head, you can't see the obvious pit as qualified.
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Label: What is the reason for the small pit on the wall where the paint is finished?
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Acids exist universally in our life. There are both numerous kinds of natural ACID compounds with biological functions and massive synthesized acids which are used in many ways.
In industry
Acids are fundamental reagents in treating almost all processes in today's industry. In the chemical industry, acids react in neutralization reactions to produce salts. For example, nitric acid reacts with ammonia to produce ammonium nitrate, a fertilizer. Additionally, carboxylic acids can be esterified with alcohols, to produce esters. Acids are often used to remove rust and other corrosion from metals in a process known as pickling. They may be used as an electrolyte in a wet cell battery, such as sulfuric acid in a car battery.
In food
Many acids can be found in various kinds of food as additives, as they alter their taste and serve as preservatives. Phosphoric acid, for example, is a component of cola drinks. Acetic Acid is used in day-to-day life as vinegar. Citric acid is used as a preservative in sauces and pickles. Certain acids are used as drugs. Acetylsalicylic acid (Aspirin) is used as a pain killer and for bringing down fevers.
Acid catalysis
Acids are used as catalysts in industrial and organic chemistry; for example, sulfuric acid is used in very large quantities in the alkylation process to produce gasoline. Some acids, such as sulfuric, phosphoric, and hydrochloric acids, also effect dehydration and condensation reactions. In biochemistry, many enzymes employ acid catalysis.
ACID
Ethanedioic Acid,Anhydrous Oxalic Acid,Acetic Acid 98.5%,Acid Industry Grade
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