Leveling agent is a kind of coating additives often used in our textile industry. It can promote the coating to form a flat, smooth and uniform film in the process of drying film, so that our fabric becomes smooth and smooth. It is just an understanding of most of us about leveling agent.

    The main function of paint is decoration and protection, if there are flow and leveling defects, not only affect the appearance, but also damage the protection function.Such as the formation of shrinkage caused by insufficient thickness of the film, the formation of pinholes will lead to the discontinuity of the film, which will reduce the protection of the film.In the process of coating construction and film formation, some physical and chemical changes will occur. These changes and the properties of the coating itself will significantly affect the flow and leveling of the coating.

    After the coating is applied, a new interface will appear, generally the liquid/solid interface between the coating and the substrate and the liquid/gas interface between the coating and the air.If the interfacial tension of the liquid/solid interface between the coating and the substrate is higher than the critical surface tension of the substrate, the coating will not be able to spread on the substrate, and naturally there will be levelling defects such as fish eyes and shrinkage holes.

    The evaporation of solvents during the drying process of the film will lead to the temperature, density and surface tension differences between the surface and the interior of the film. These differences in turn lead to the turbulent motion within the film, forming the so-called Benard vortex.The Benard vortex will produce orange peel;In the system containing more than one pigment, if there is a certain difference in the movement of pigment particles, the Benard vortex is likely to lead to floating color and flowers, and the vertical plane construction will lead to silk.

    The drying process of paint film sometimes produces some insoluble colloidal particles. The production of insoluble colloidal particles will lead to the formation of surface tension gradient, which often leads to the production of shrinkage pores in paint film.For example, in a cross-linked curing system where the formulation contains more than one resin, the less soluble resin may form insoluble colloidal particles as the solvent evaporates during the drying of the film.In addition, in formulations containing surfactants, surface tension differences can also form if the surfactant is incompatible with the system, or if the concentration changes as the solvent evaporates during the drying process, resulting in a change in solubility and the formation of incompatible droplets.These can lead to the formation of shrinkage holes.

    In the process of coating construction and film formation, if there are external pollutants, it may also lead to shrinkage hole, fisheye and other leveling defects.These pollutants are usually from the air, construction tools and substrate oil, dust, paint fog, water vapor and so on.

    The properties of the paint itself, such as construction viscosity and drying time, will also have a significant effect on the final leveling of the film.High construction viscosity and short drying time usually result in poor leveling of the surface.

    Therefore, it is necessary to help the coating obtain a good leveling by adding leveling agent, by adjusting some changes in the process of coating construction and film formation and coating properties.We have independently developed dimethyl silicone oil, phenyl silicone oil, leveling agent and other products.More than 10 years of production experience, reliable.