Matte powders are sometimes required to have a semi-gloss or matte powder coating depending on the application. In order to reduce the gloss of the coating film, conventional matting agents include ultrafine silica, talc, aluminum stearate, calcium stearate, and low molecular weight thermoplastic resins. To get the matting effect, you can use the following methods:
a. The powder coatings with different curing speeds are mixed by the dry mixing method, and the gloss of the obtained coating film is remarkably lowered to play a matting effect. Due to the rapid curing of the highly reactive powder coating, the slower curing of the continuous phase of the resin and the reaction are hindered, so that the final cured coating loses its luster. Although this method is effective, it increases the manufacturing process and costs.
b. Add a thermoplastic resin. A cellulose powder is added to the epoxy powder coating, and a fine powdery low molecular weight polyethylene or a polypropylene resin is added to the polyester powder coating to obtain a matte powder coating. The gloss of the coating film is affected by the manufacturing conditions. Since the addition of the thermoplastic resin will affect the storage stability of the powder coating, the amount of addition is limited to 23% of the amount of the resin.
What problems should we pay attention to when using matting powder?
C. special curing agent with extinction effect.D. Add packing with extinction effect.Add ultrafine silica, talcum powder and other fillers to significantly reduce the luster.In particular, the particle size of the filler has a great impact on the gloss of the film.The larger the particle size, the lower the luster.It should be noted that increasing the amount of filler, will make the film flat and mechanical strength decreased.In epoxy powder coating, the influence of calcium carbonate particle size on the gloss of coating is shown in the table.Matt coatings can be obtained by adding ultrafine silica and kaolin to acrylic and polyester powder coatings.In addition, wax such as polyethylene paraffin and hydrogenated castor oil can also be used to obtain matt coatings.
The difference between matte agent and matting powder
The Matting Agent is a light yellow bright liquid or black liquid, suitable for various inks, resins, coatings and liquid silicone rubber and low viscosity two-component silicone potting compound.
The mechanism of matte light: the light shines on the rough appearance, the reflected light will scatter and the gloss will drop. L-1030/1031 matting agent is based on the scattering principle of this light. When the compound is dry, the matting agent in the glue makes the rubber surface form a micro-rough surface, when the incident light reaches the gel surface. Slow onset of seizures, strong matte effect.
Matting powder is a kind of chemical agent which is very simple and disintegrated and organically disposed. It is a kind of coating auxiliary. The main purpose of matting powder is to reduce the gloss of the coating film. The commonly used matting powder has ultrafine silica. , talc, aluminum stearate, calcium stearate, low molecular weight thermoplastic resin, and the like.
Anticorrosion Pigments, Inkjet Receptive Coating, Matting Agent
