Matting agent for UV coating

UV light curing coating matting agent selection.

UV light-curing coatings because of the absence of volatile organic solvents, wet film drying shrinkage is very small, and the drying time is short. Overall, matting is difficult. But the low reactivity of the coating matting is relatively easy, while the high reactivity of the coating is difficult to matting.

The average particle size of the matting agent developed byk recently is small, the pore volume is small, the actual measurement value is only 0.9ML/G, and the surface special organic treatment agent is up to 20%, but it will not cause “hidden bubble”, and the matting efficiency is high.

Anionic and nonionic surfactants play a very important role in the emulsion synthesis process. In order to meet technical requirements, the two surfactants are often mixed and used. The yearbook shows that there are thousands of different products of surfactants that are commercially produced and can be found on the market [14]. The selection of a surfactant or a suitable surfactant system is usually an iterative process of “experiment-failure” and includes the screening of hundreds of surfactants.

The concept of HLB value (hydrophilic-hydrophobic balance) is widely used, polyamide wax especially for selecting suitable nonionic surfactants or the balance of surfactants in many emulsion systems. In this simple linear HLB value system, the value between 1 and 20 is called emulsifier. A lower value in this range indicates a stronger oil solubility trend, and a higher value indicates a stronger water solubility trend. However, not all non-ionic surfactants are suitable. This is only an empirical discussion.

This mainly depends on the physical and chemical properties of the surfactant 80, that is, the ability of the surfactant to reduce E at the interface between the air phase and the water phase to only a half-low surface tension. The dynamic surface tension of water CMC of about 1.5g/L is fixed at the interface of gas and liquid phase, about 72mN/m. Concentration/(g/L)

With a certain amount of surface activity Figure 1-3Tex ap on°K 12 (needle-shaped) Surface tension and agent are added to the water phase, the surface concentration relationship and CMC tension will continue to decrease until the interface between the gas phase and the water phase Saturated with surfactant molecules.