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Application of fumed silica matting agent in coatings

October 12, 2019


The addition of pigments or fillers to a coating, evenly distributed in the coating film to form a slightly rough surface.The larger the particle on the surface, the lower the gloss.Sometimes the precipitating calcium carbonate or talc is used when producing matte coating, dosage is bigger, often exceed and make physical property becomes poor, appear the phenomenon such as layer and hard precipitation, the critical pigment volume concentration that USES Matting Agent can avoid film of this kind of oil paint produces matte coating phenomenon.The commonly used organic and inorganic matting agents 2, inorganic matting agent is mainly white Carbon Black Matting Agent, its chemical composition is silica, the surface is divided into organic treatment and untreated.The following is to introduce the application of carbon black matting agent in coatings.


1, pyrolysis Silica Matting Agent: the grinding processing of quartz sand (powder), many impurities, main composition is sio2, cannot be called white carbon black, no extinction performance only as coating packing, no extinction, as matting agent and silica coating is mainly synthetic silica, Fumed Silica and precipitated silica, microstructure is amorphous or vitreous.Precipitated silica is mainly made of quartz sand, sodium carbonate or sodium hydroxide and its temperature after the reaction in the furnace, and then through the melt treatment system.Calcined silica is made by hydrolyzing silicon tetrachloride in hydrogen and oxygen flame. Compared with natural silica, silica of silica has high purity, great inertia and ultraviolet resistance.1.46 is the refractive index of amorphous silica, which is similar to the refraction value of many resins in the coating industry. Therefore, amorphous silica with good optical properties can be used as a matting agent in coatings.


2. Extinction mechanism of carbon black and pyrolytic silica matting agent: when the varnish coating mirror film without matting agent is in a state of levelling, when the light reaches the surface of the film mirror, the incident light is partially absorbed and partially reflected, part of the film presents luster.The film contains a silica matting agent, which is evenly distributed over the film of silica particles to form a slightly rougher surface.The cross section scanning electron micrograph of the film's matting agent particles is evenly distributed in the film. When the incident light reaches the uneven surface of the film, it is clearly visible and diffused. The light is scattered to produce a low gloss and matt matting appearance.High porosity, good particle size distribution and suitable surface treatment of silica matting agent can get good matting effect.

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