Metal materials (such as steel) are chemically active, and the surface is exposed to water, oxygen, and various acid, alkali, and salt electrolyte ions, which may cause oxidative corrosion, electrochemical corrosion, etc., causing steel corrosion, and the volume of iron oxide generated by steel corrosion is easy to fall off. , causing damage to the steel structure.The coating selected for the coating of steel and metal products depends on the structure and composition of the product itself and the environment in which the product will be used in the future, and also depends on factors such as the user's appearance and service life requirements.There are many kinds of coatings that can be used on steel surfaces. According to steel products, there are marine coatings, automotive coatings, light industrial coatings, etc.; according to the main effects of coatings, there are anti-rust coatings, chemical corrosion-resistant coatings, decorative coatings, etc. For the surface coating of steel metal substrates, poor impermeability and poor adhesion of the coating film are serious defects. The defects such as pores, pinholes, shrinkage cavities, cracks, etc. of the coating film itself are channels through which steel corrosion medium (water, oxygen, electrolyte ions) penetrates, and these channels reduce the impermeability of the coating film.When the oxygen and electrolyte ions are dissolved in water, they will travel through the coating film with the liquid water. When designing anti-corrosion coatings, the wet adhesion is considered as the primary condition in terms of mechanical properties. The protective life of the paint film is inferred by wet adhesion. Some people say that if there is sufficient wet adhesion, the protection of the coating is indefinite.Therefore, it can be said that factors affecting the wet and dry adhesion of the coating film accelerate the expansion of the rust and increase the corrosion. Therefore, the coating with poor wet adhesion of the coating film cannot be coated before it is improved, so as to avoid causing more waste. Sinograce chemical produces anticorrosive coating and anti rust coating for metal surfaces. visit us sinograce chemical: https://www.sinogracechem.com Get a Quote Now :sales@sinogracechem.com Telephone               :+86 0551 63459511

Wood coating process 1.There are many large holes in the hard wood, putty or hole adding agent to flatten; 2.Apply closing primer after hole filling； 3.If you need to deepen the surface texture of the wood and highlight the wood grain, you can apply the closed primer and apply the water color； 4.After conditioning the wood grain, apply two closed primer； 5.Finish with top coat. Sinograce Chemical company has professional technical guidance on coatings. We have polyurethane solutions, acrylic emulsions, wood coatings, and various additives such as leveling agents, defoamers, etc. Sinograce Chemical is professional technical enterprise providing solutions of surface materials and manufacturing of raw materials. Sinograce chemical produces waterborne wood paint coating, as well as top and bottom coatings, and chemical additives. visit us sinograce chemical: https://www.sinogracechem.com Get a Quote Now :sales@sinogracechem.com Telephone               :+86 0551 63459511

Due to the chemical composition of the wood and the particularity of the wood fiber, if it is not handled properly, the water-based paint film will be damaged. Wood is composed of cellulose and a small amount of gum, resin (rosin), pigment, tannin and the like. Although the amount of gum, resin, pigment, tannin, etc. is small, it has a large negative impact on the properties of the coating (mainly film forming and durability), it will affect the adhesion of the coating, if the upward osmosis It also affects the appearance of the film. Wood fiber is hydrophilic, moisture absorption is easy to expand, and drying shrinkage is easy to cause cracking. Wood is prone to cracking and deformation during continuous moisture absorption and drying. Therefore, the wood should be dried before painting to control its water content to suit the local climate to avoid hygroscopic expansion in humid climates or dry shrinkage in dry climates. The moisture content of wood used as building materials or for outdoor use is controlled between 14% and 22%, and for furniture or indoor structures is controlled at around 12%. If the wood topcoat is not hydrophobic, the water will penetrate into the coating film during the coating and use process. If it is light, the appearance of the decorative article will be black and white, and the heavy one will intensify the expansion deformation and mold of the wood fiber,rot. In the process of wood coating, because the wood is a dense and uneven substrate，If the primer is poorly sealed, the solvent and the base material in the topcoat are not uniformly permeable, which may cause the gloss of the topcoat to be uneven and lose light, resulting in poor gloss stability. For the floating color coating, because the penetration is not uniform, the drying rate of the coating film is different, which causes the color to appear uneven. Cork primer glass vitrification is too high, the coating film is too hard and lacks deformation ability, and it is not suitable for the deformation of wood fiber, which will cause cracking and wrinkling of the topcoat. Hard wood has a tight texture and is not prone to expansion and contraction, so coatings used on hardwoods do not necessarily require good flexibility. Sinograce chemical produces waterborne wood paint coating, as well as top and bottom coatings, and chemical additives. visit us sinograce chemical: https://www.sinogracechem.com Get a Quote Now :sales@sinogracechem.com Telephone               :+86 0551 63459511

To master waterborne wood coatings and coatings, you must be familiar with the characteristics of wood. In this way, we can find the root cause of the problem in the painting process and make the necessary preventive and treatment measures. Wood is a natural fiber material, seen from the cross section of the trunk, it is a uniform material composed of layers of different materials, with many textures and holes in the middle. The trunk consists of the outer bark, the pith in the center, and the turning of the wood in between.The outer frame of the bark is soft, the center of the pulp is loose, and the middle part of the wood is hard. The wood part is the main part of the trunk, and the wood we use is the wooden part of the trunk. The material part is mainly composed of wood fiber and a middle duct. The duct is a tree used to transport water and inorganic salts: the wooden surface of the tree has many concentric circles called the annual rings.Because trees grow at different rates from spring, summer, autumn and winter, their texture varies. On the cross section of the trunk, from the loose pith in the central part of the tree to the outer bark of the tree, there are strips of radial radiation lines, called pith rays. These pith and pith rays are composed of slab-wall cells, with a relatively loose texture. According to the varieties of trees, Kimura can be divided into hardwood and softwood. Coniferous trees are soft cork, such as pine, fir, etc., used in construction: broad-leaved trees are strong. Hard texture is hardwood, such as teak, walnut, ash, etc., can be used for furniture and tools. Hard wood has a tight texture and is not easy to expand and contract. However, there are also small holes in the structure. It needs to be added with a putty or a hole-filling agent during the coating process. Sinograce chemical produces waterborne wood paint coating, as well as top and bottom coatings, and chemical additives. visit us sinograce chemical: https://www.sinogracechem.com Get a Quote Now :sales@sinogracechem.com Telephone               :+86 0551 63459511