The effect of pigment dispersion on the properties of the coating, we will separately discuss the effects of pigment dispersants on the following properties of the coating: gloss, transparency, compatibility, leveling, production, color strength, and reduction of VOC. luster This is an indicator of the properties of the film. The higher the gloss, the stronger the reflection. For the gloss of high quality coatings, the particles should not be larger than 5 microns and up to 3 microns. The ink should not exceed 1 micron. Large particles in the coating either do not disperse effectively, or flocculate, or stimulate crystallization during the formulation process. The polymeric dispersant also reduces large particles formed by flocculation and improves gloss. Transparent This is a characteristic of the film. The higher the transparency, the easier it is to see the bottom layer. The higher the hiding power, the stronger the hiding power of the bottom layer. The amount of light reflected and passed through the surface determines the hiding power or transparency of the coating. The type of pigment and the degree of dispersion have an effect on this. Occlusive pigments have a greater effect on reflected light due to the influence of refractive index and particle size. Polymeric dispersants increase transparency by affecting the pigment particle size distribution (more uniform and narrower). For titanium dioxide, high refractive index and large particles can effectively reflect and refract light of various wavelengths. The addition of a polymeric dispersant can increase the surface area (reducing agglomerates, reducing the particle size) and further improving the hiding power. For transparent pigments, the polymer dispersant improves the particle size distribution for more light transmission (increased transparency). Compatible Compatibility is important because good compatibility allows coating manufacturers to produce dispersions for many different types of resin products. Polymeric dispersants can increase the pigment concentration, not only increasing yield, but also reducing potential media incompatibility issues from grinding the colorant to the final product. Therefore, especially in the case of using a highly compatible resin, the polymer dispersant expands the range of use of the base paint. This is very important for the production of mixed pigmented coatings. Flow/leveling Leveling is the ability of a coating to spread on a particular surface. Coating surface defects are usually caused by surface tension and occur relatively quickly. Brush marks on decorative paints are also usually caused by insufficient leveling. The ideal flow parallelism can be explained by Newtonian mechanics. However, after the pigment is introduced into the system, it changes. This is because the particles are affected by chemical bonds and physical interactions and are very susceptible to thixotropic and pseudoplasticity. The start of the shield machine refers to a series of work in which the shield machine is driven from the tunnel door to the undisturbed soil section by using the temporarily assembled pipe segments, Reaction Frame and other equipment of the working shaft. Reinforcement of the starting end, installation of shield machine, starting bracket, assembly of shield machine, installation of reaction frame, shield machine system debugging. Starting Frame,Shield Launching Frame,Shield Starting Base Structure,Starting Base Frame Anshan Lijian Engineering Group Co. LTD , https://www.lijianformwork.com
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