Xiaobian once introduced the epoxy floor paint in the previous article. I personally feel that the content introduced today has similarities with it. Solvent-free epoxy resin coating is a chemical product with strong anti-corrosion and adhesion. Although it is solvent-free, it has the characteristics of solvent-based epoxy coating. Then let Xiaobian take everyone to look at the introduction of the relevant content of solvent-free epoxy coatings .
1. Solvent-free epoxy coatings are a substitute for low-pollution of solvent-based epoxy coatings, and have better unique product properties. The organic solvent in the solvent coating is relatively small, and the volume solids are in the range of 98% to 100%.
2. Solvent-free epoxy coatings are used as lining coatings for tank inner walls, inner walls of water pipelines, inner walls of tanks, etc., or for heavy-duty applications of large steel structures such as offshore platforms and water conservancy facilities. Solvent epoxy glass flakes have better corrosion resistance, and solvent phenolic epoxy coatings have better high temperature resistance.
3. Solvent-free epoxy coatings have the following characteristics compared to solvent-based epoxy coatings.
(1) Edge-covering solvent Epoxy coating has strong covering ability on the edge of untreated steel sheet, while solvent-based epoxy paint shrinks at the edge of steel due to solvent evaporation, resulting in thin film coating and lowering Antiseptic effect. This is one of the main reasons why the edge of the profile that we can often see is rusted first, but the plane is intact.
(2) Non-shrinkage, no elongation The solvent-free epoxy does not shrink during the curing process, and the coating does not elongate after drying, which is the main feature of the solvent-free epoxy coating for durability. When the solvent-based epoxy coating is dried, it will cause cracking due to solvent evaporation, and the non-shrinking property of the solvent-free epoxy makes it unsuitable for cracks to occur when an uneven steel plate is encountered.
(3) Safety of construction Since ordinary solvent-based epoxy coatings contain more than 40% of volatile organic solvents, it is a high-solid epoxy coating in time, and the volatile organic content (VOC) is also more than 20%. The large amount of organic solvents present has brought a lot of safety, hygiene and environmental problems to the use of paints.
There are a large number of open flame operations in the manufacture of steel structures. Therefore, it is necessary to avoid open flames during painting and construction, or after the painting operation is completed, the test is performed after the test is completed, and the time for stopping the open flame operation depends on the length of the solvent evaporation process. And ventilation. The use of solvent-free epoxy coatings can greatly reduce this time due to the low amount of volatile solvents, which facilitates the production schedule for steel structure manufacturing.
In addition, in order to ensure the health of the construction workers, the content of the air must be limited. The higher the organic solvent content in the coating, the greater the amount of fresh air that needs to be replenished, ie the greater the amount of ventilation required. For some closed parts, such as the cabin of the ship, petrochemical tanks and other occasions, the use of solvent-free epoxy coating means that this part of the ventilation can be reduced.
(4) Environmental protection It must be emphasized that the most prominent advantage of using solvent-free epoxy coatings is to reduce the air pollution caused by the evaporation of organic solvents. In heavy-duty coatings, the solvent-free and water-based coatings will be the development direction, while solvent-free epoxy coatings are more practical under current conditions.
(5) Thick film type construction Solvent-free epoxy pattern can be applied in thick film type, which can reach 150~400μm or even higher dry film thickness. This greatly saves construction time. For the integrity of the paint film, to avoid defects in one construction, it is recommended to apply two paints to achieve the specified dry film thickness.
How about, I read the above introduction to solvent-free epoxy coatings, and I have learned a lot about solvent-free epoxy coatings. I hope that you can learn more about home improvement knowledge through this article, and you will be able to create a more perfect home environment. Thank you for reading this article and your support and love for Xiaobian. If you want to get more information about home improvement, please continue to pay attention to the decoration home network.
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