Wood coating is often used as a protective paint for furniture, which greatly improves the properties of furniture such as wear resistance, scratch resistance, and corrosion resistance, thereby prolonging the service life of wood furniture.
Water-based coating is also an environmentally friendly product that has developed rapidly in recent years. Water-based wood lacquer produced by adding water-based additives has many advantages:
1. High film transparency, soft paint film and high solid content;
2. The water-soluble system does not contain APEO, VOC and other harmful substances;
3. High cost performance, safe and harmless to construction personnel;
4. The construction is convenient and the bubble phenomenon is reduced;
5. Good hand feeling, especially smooth, water-resistant and wear-resistant.
However, the use of wood lacquer also needs to pay attention to skills. The common problems are:
Poor paint film adhesion:
After the construction of general water-based wood paint, it will be found that the adhesion between the coating layers is not strong, resulting in poor adhesion. In summer, the temperature is high and the humidity in the air is high in some areas. Construction personnel are required to fully polish each layer to improve adhesion. At the same time, it is advisable to arrange construction in the morning and evening to ensure that the inherent quality of the product is reflected.
The paint layer is whitish:
The main reason is that the humidity of the construction environment is too high, and the coating film is too thick during the construction process. In summer, the temperature is high and the air humidity is high in some areas. During the construction process, the drying time may be neglected, and another coat of paint is applied immediately after the paint layer is dry. In rainy or humid weather, the paint layer is prone to whitening.
Paint film cracking:
This phenomenon is also common in summer construction. During the construction process, the paint film is too thick, which causes the surface layer to dry quickly and form a film, but the thick inner layer dries slowly, which directly causes cracking of the primer. At the same time, attention should also be paid to the board If there are quality problems, it is recommended to purchase a plate with good stability.
Paint film wrinkling:
In the flat coating, one-time thick coating is adopted, and the fullness of the result is excellent, but at high temperature, the surface layer of the paint film dries quickly to form a film, but the thick inner layer dries slowly, and the paint is not smooth. The flow creates a tension difference that results in an uneven, i.e. wrinkled, final film surface.
Application of water-based wax in wood lacquer:
How to improve the above-mentioned problems of wood lacquer has been deeply researched at home and abroad. Studies have shown that the addition of wax emulsion can greatly improve the surface performance of wood lacquer. It can not only enhance the abrasion resistance, scratch/scratch resistance, high temperature adhesion resistance and other properties of wood ware paint, but also improve the feel and gloss of wood furniture.
Production of high melting point polyolefin wax dispersion by emulsification method:
Polyethylene wax（PE Wax）, polypropylene wax(PP Wax), and Fischer-Tropsch wax(FT Wax) can be made into water dispersions with a particle size of 4-10 μm, which can improve scratch resistance and abrasion resistance in water-based coatings. The wax-water dispersion produced by the emulsification method overcomes the dispersion problem in the coating. The wax (oily) melted at high temperature forms dispersed particles with a reasonable particle size under the high shear of the emulsifier and equipment, and turns into Suspoemulsion of solid particles. Its spatial structure is similar to emulsion micelles. The lipophilic group of the emulsifier dissolves in the wax particles, and the hydrophilic group forms a good combination with the water phase, thus greatly improving the dispersion stability of the dispersion.
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