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

Essence As long as the amount of essence can improve the odor of the paint liquid, the dosage is about 0.05%, and the individual case can be as high as 0.1%. Of course, it can be used. ultraviolet light absorber Indoor water-based wood paint rarely use ultraviolet absorbent, for the use of TDI emulsion or moisture dispersion production of varnish and outdoor paint, especially outdoor white paint had better add ultraviolet absorbent, in order to prevent photodegradation and reduce the speed of photochromism. Thickener Thickening agent provides viscosity under low shear conditions. Paint viscosity is large, a coating film thick, paint film fullness is high. More main is the settlement that can prevent the solid composition in lacquer of high viscosity recipe, this is very important to the inferior smooth lacquer that this pair of solid color lacquer, be putty and add to have eliminate smooth pink, otherwise lacquer can produce when storing precipitation, divide water to wait for malpractice.The amount of the thickener is controlled within 0.5%, and is added after dilution with water or a film forming aid such as propylene glycol, propylene glycol butyl ether, diethylene glycol diethyl ether or ethylene glycol butyl ether to facilitate rapid dispersion, prevention of flocculation and Agglomeration. Sinograce Chemical produces water based additives, such as thickener, crosslinking agent, wetting agent.

In the solid paint, white paint is taken as an example. The amount of titanium dioxide should be sufficient to ensure that the paint film has sufficient capping power. The amount of titanium dioxide should not be lower than 13%, but it is not necessary to be higher than 22%. The situation is the same as solvent-based white paint. Fillers may be added or not added. However, a small amount of filler must be added to the water-based putty, such as talc, heavy calcium, and zinc stearate. The total amount can be between 15% and 30~//oo. The more filler, the worse the transparency of the putty, but the better the interstitial. Colorants include pigments and dyes. Pigments are used in solid paints (coating without revealing wood grain) and dyes are used in clear paints (painting of wood grain). When there is a pigment filler in the formulation, a wetting and dispersing agent of 2% to 10% of the total amount of the pigment filler is added to help disperse the pigment filler. Sinograce Chemical produces water based additives, such as thickener, crosslinking agent, wetting agent.