Physical adsorption. In order to adsorb, it is necessary to select and physically adsorb the filler, add it to the coating system, evenly disperse it after coating grinding and other processes, and release the free formaldehyde in the absorption environment through the surface structure of the adsorbed filler coating film, and store it in the packaging. At present, the internationally popular adsorption fillers, including activated carbon, diatomite, wheat grain and other fillers, are such an adsorption principle. They are treated by special coating process to make them fully dispersed and keep adsorption function for a long time. As a natural material, diatomite is widely used in coatings. Diatomite is a kind of phytoplankton, belonging to algae. This unicellular phytoplankton can absorb silicate in water abnormally, form cell wall, and form diatomite with silicic acid as main component. This microporous structure makes diatomite have good properties of absorbing harmful gases such as formaldehyde and hygroscopic. With natural materials, green environmental protection, deeply loved by consumers. In recent years, the bamboo charcoal coating, which is also the upgraded version of activated carbon and the principle of physical adsorption, has also won the hearts of many consumers.

　　与物理吸附相比，化学分解对甲醛等有害气体的处理更为彻底。还以添加物的形式，向涂料体系中添加化学分解甲醛的化学添加物，以确保涂料形成膜后，该成分能够捕获甲醛，吸收并分解为无害成分。原理很简单，但找到合适的添加剂就不简单了。添加剂必须与涂料体系具有很好的相容性和配合性，其次涂料中的其他成分不能破坏化学分解助剂的结构，不影响其正常发挥作用，这并不是所有涂料配方都能做到的。目前，我们可以找到更多种类的催化剂添加剂，包括银离子催化剂、负离子催化剂和其他不同的催化剂材料。从催化剂的生产原理来看，光催化剂是更适合的涂料产品。特别是可重复使用的光催化材料，在光辐射下产生催化作用，吸收并分解甲醛，与植物光合作用具有相同的可回收性，是更理想的添加剂。

　　Compared with physical adsorption, chemical decomposition is more thorough in the treatment of formaldehyde and other harmful gases. In addition, in the form of additives, the chemical additives that can decompose formaldehyde are added to the coating system to ensure that the component can capture formaldehyde, absorb and decompose into harmless components after the coating film is formed. The principle is simple, but it's not easy to find the right additives. The additives must have good compatibility and coordination with the coating system. Secondly, other components in the coating cannot destroy the structure of the chemical decomposition additives and do not affect their normal function, which is not all the coating formulations can achieve. At present, we can find more kinds of catalyst additives, including silver ion catalyst, anion catalyst and other different catalyst materials. According to the production principle of catalyst, photocatalyst is the most suitable coating product. In particular, the reusable photocatalysis material, which can produce catalysis under the light radiation, absorb and decompose formaldehyde, has the same recyclability as plant photosynthesis, and is the most ideal additive.

　　如果你能把物理和化学方法结合起来，甲醛的去除效果会更好。吸附与分解相辅相成，取长补短，效果会更加明显。因为涂层作为家庭装饰材料之一,不仅要考虑自己不释放甲醛,还需要考虑如何甲醛气体,其他材料生产,可以说这种设计思路是功能材料作为涂层的一种空气净化进行设计。

　　If you can combine physical and chemical methods, formaldehyde removal will be better. Adsorption and decomposition complement each other, learn from each other, and the environmental protection effect will be more obvious. As one of the decoration materials for home, coating should not only consider not releasing formaldehyde, but also consider how to eliminate formaldehyde gas. Other material production, it can be said that this design idea is that functional material is designed as an air purification of coating.

　　除此之外，我还想谈谈零voc涂料基材、溶剂和添加剂的研发，这是一种从根本上去除甲醛等有害物质的方法。流行的零VOC设计理念有两个方向，一是涂料固含量高，无挥发;二是以水为基础的所有原料，杜绝有机溶剂的参与。但建筑涂料有些特殊，不可能采用高固体度涂料，这主要用于工业和汽车等领域，所以水性建筑涂料已成为发展方向。从目前的趋势来看，只要水基技术能够在性能和成本之间找到平衡，我们的消费者就会迎来真正的水基涂料产品，甲醛，自然消失得无影无踪。

　　In addition, I would like to talk about the research and development of zero VOC coating substrate, solvent and additive, which is a fundamental way to remove formaldehyde and other harmful substances. The international popular zero VOC design concept has two directions: one is the high solid content of the coating, no volatilization; the other is all the raw materials based on water, to eliminate the participation of organic solvents. However, due to the particularity of architectural coatings, it is impossible to use high solid coatings, which are mainly used in industry, automobile and other fields, so waterborne architectural coatings have become the development direction. From the current trend, as long as water-based technology can find a balance between performance and cost, our consumers will usher in the real water-based coating products, formaldehyde, will disappear without trace.