It is understood that fumed silica (fumed white carbon black) is white granular and inactive in nature. It does not interact with halogens and halogenated substances other than fluorine and hydrogen fluoride. Through the action of hydrogen, sulfuric acid, nitric acid, and perchloric acid (except for hot concentrated phosphoric acid), the fumed silica particles are fully and evenly dispersed into the resin material, which can fully achieve the purpose of improving the properties of the resin-based material.
The particle size of fumed silica is very small, so it has a large specific surface area, strong surface adsorption, high surface energy, and is very easy to agglomerate. Fumed silica has high chemical purity and good dispersion properties. It also has specific properties in terms of thermal resistance and electrical resistance. With its superior stability, reinforcement, thickening and thixotropy, it is unique in many disciplines and fields. Characteristics play an irreplaceable role.
Application and role of fumed silica in ink coatings:
Application in ink coatings can improve inkjet printing gloss and ink absorbency. To improve the fluidity of the ink and the influence of the characteristics of the marinade in the coating on the surface of the coated paper, a combination of chemical and physical methods can be used to disperse fumed silica, and a good dispersion effect can be obtained.
With the increase in the amount of fumed silica, the smoothness of the coated paper is significantly improved, but the ink absorbency is slightly reduced. The solid content of the coating is controlled at 25%, which can be obtained by two coatings. High gloss and suitable ink absorbency.
Pyrogenic silica acts as a thixotropic agent in moisture-sensitive systems; it is an effective material for anti-rust coatings; it improves the printing characteristics and ink balance of offset inks. When using this additive, it must be fully dispersed. Generally, the master mixture method is ideal.
In industrial inks, fumed silica can be used to control the flow properties of the product. In printing or laser printing, fumed silica can be used as a dispersant to control the printing performance.
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