White carbon black is now a very popular product. Because of its good performance, wide application and valuable potential functions, white carbon black has not been abandoned. The key is that the field of white carbon black is indeed too wide. Today, we will talk about the application of white carbon black in leather coatings.


The leather finishing agent is white carbon black, which has two types: high gloss (bright) and matte. Usually, the glossiness required is adjusted according to a certain proportion of bright and matte. Gas phase white carbon black is used as a matte finishing agent and plays a role of extinction. Because the deposited matte powder is more serious, it simply presents a deposition appearance in the polyurethane system. The extinction effect of Degussa vapor phase extinction powder ts-100, tt-600, or Japanese tokama fm-14 can be treated, but the cost is high. At this time, Wacker N20 (hydrophilic, 200 square meters / gram, uniform particle size of 12 nanometers, can achieve extinction and reduce costs together. N20 also plays a role in preventing sedimentation. More importantly, N20 will not reduce the brilliance and fullness. Wacker N20 has been widely used in the leather finishing industry. Leather finishing is mainly distributed in Jiangsu, Zhejiang, Fujian and other three provinces.


The so-called extinction, also known as matte, is the physical uniform dispersion of nano particles in the system. When the light expires and is continuously reflected by these small particles, zinc stearate presents the so-called total reflection, so that the light cannot be emitted. In this way, the appearance will become dark and lusterless.


The best selection of silica dispersion method and dispersion equipment depends on the consistency of the system. Sometimes we suggest that some liquid or some formula materials should be used to disperse all the fumed silica, and then the remaining liquid and other formula materials should be used to adjust the content of fumed silica to reach the formula demand share. In principle, fumed silica of white carbon black is added as the fundamental particle size decreases. However, with the addition of particle fineness, higher shear force is required to achieve its thickening effect.


The effect of fumed silica depends on the strength of dispersion to a large extent, and at least a high-speed dispersion machine needs to be selected for dispersion. To achieve the best dispersion effect of white carbon black, you can choose rotor stator dispersion, ball machine, three roller machine dispersion and ultrasonic dispersion equipment.


The above is about the use of white carbon black in leather coatings. Do you all know it? In the future, we will continue to introduce the role of white carbon black in other fields. Please continue to pay attention to it.