Key points of painting process —— 1. Preparation before painting
1. Inspection of paint performance
Before applying various paints, check the paint name, batch number, manufacturer, and production date. If necessary, performance tests can be conducted. Understand the required pre - treatment methods before painting, as well as the application and drying methods of the paint. For two - (multi -) component paints, check their mixing ratio and the effective service life after mixing. Prepare the matching thinner. It is best to conduct a small - area color - change test coating on the workpiece to be painted to determine the construction process parameters. 2. Opening the paint bucket
When opening the paint bucket, first remove all the dust and debris on the bucket surface. If skinning is found after opening the bucket, remove the skin to avoid affecting the quality. Learn More Surface treatment before painting —— 1. Surface treatment of steel
Steel products are often in contact with the atmosphere. Due to the action of oxygen and water in the atmosphere and possible SO2, CO2, H2S, etc., they are very prone to corrosion, resulting in a decrease in the performance of the products or even damage. Therefore, in the pre - painting treatment, the unfavorable factors affecting the coating quality must be eliminated to improve the protective performance of the coating.
The pre - painting surface treatment of steel, also known as rust removal, not only refers to removing the rust on the steel surface, but also should include removing the oxide scale, old coatings, and contaminated grease, dust, residual welding slag, etc. covering the steel surface. Therefore, the quality of steel surface treatment mainly refers to the degree of removal of the above - mentioned contaminants, that is, cleanliness, and also includes the appropriate “roughness” formed on the steel surface after treatment. Learn More Common painting defects and prevention methods —— I. Abnormalities before paint construction 【Cloudiness】 When varnish or clear lacquer becomes opaque and a cloudy phenomenon occurs, it is called cloudiness. This is mainly caused by improper selection of solvents, moisture absorption, water content, incomplete reaction, too low storage temperature, precipitation of monomers, etc. It can be solved by methods such as replacing solvents, filtering, re - reacting in the pot, and increasing the storage temperature. For example, in the case of mild cloudiness, some alcohol - based solvents can be added depending on the situation. 【Thickening】 The phenomenon that the viscosity of paint increases during the storage period and becomes difficult to apply is called thickening. The reasons are as follows: the acid value of the paint is too high, causing saponification with alkaline pigments; the bucket is leaking, resulting in solvent evaporation; water is mixed into the bucket or the pigments contain water; the storage temperature is too high, which accelerates the polymerization of the paint; the storage temperature is too low, which increases the viscosity of the paint and causes difficulties in construction. As a remedy, depending on the specific situation, the corresponding solvent can be added, and the paint can be used after stirring well to adjust the viscosity. It can also be moved to a warm room for storage for 2 - 3 days to let it return to its original consistency. Learn More Common coating defects and prevention methods —— Most coating products are flammable and volatile organic substances. During use, it is necessary to comply with relevant national safety and fire - prevention regulations and take preventive measures against fire and poisoning. 1. Preventing fires The solvents contained in coatings are extremely volatile and can form flammable gases. If they come into contact with air and accumulate to a certain concentration limit, once they come into contact with an open flame, it is very easy to cause a fire and even an explosion and other accidents. In order to ensure safe production and focus on prevention, construction units should pay attention to the following points: Learn More Packaging, marking, storage and transportation of products — — 1．产品应贮存于清洁、干燥、密封的容器中，容器附有标签，注明产品型号、名称、批号、重量、生产厂名及生产日期等内容。 2．产品多为易燃物品。应存放在阴凉通风库房，避免日晒雨淋，隔绝火种热源。 3．产品在运输时，应防止雨淋、日光曝晒，应符合运输部门有关的规定。 4．乳胶漆不属危险品，应存放于阴凉、干燥处，严防霜冻。 Learn More |
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