UV light is absorbed by iron oxide red–coated film.

Particularly, UV light is absorbed by iron oxide red–coated film. The relationship between wavelength and light transparency in trans-iron oxide red–coated film. The light transparency of UV light is lower; however, IR light easily passes through the coated film. The relationship between particle size of iron oxide red particles and light transparency at λ = 700 nm. When the particle size is finer than 100 nm, light transparency becomes larger. Then, iron oxide pigment can be applied as transpigment for transparency film with a function of UV absorbent. The preparation procedure of trans-iron oxide red particles is mentioned as follows: iron sulfate solution and sodium carbonate solution are mixed and aged in the reactor with N2-gas bubbling; then, the oxidation reaction occurs with aeration and nanosized α-FeOOH particles are synthesized in the reactor. α-FeOOH particles are washed and dried to derive α-FeOOH powder with acicular shape and particle size of 80 nm as precursor particles of iron oxide red pigment. α-FeOOH particles are heated at 250–400°C in the oven and dehydrated to α-Fe2O3 particles, and then nanosized iron oxide red particles are derived. Nanosized iron oxide red particles are hard to disperse because particle size is so small. It seems that they tend to coagulate together. It is necessary to introduce a surface treatment onto particles for easy dispersion. We recommend silicone coating onto iron oxide red particles to reduce their coagulation force between particles. Silicone additive is coated on nanosized iron oxide red particles in amounts such as 1, 1/2, 1/4, 1/8, 1/16, and 1/32-layer equivalent. If coagulation force between particles was reduced, particles would be dispersed well in the lacquer, and light transparency becomes higher in coloring film. Silicone-coated iron oxide red particles with 1/4-layer equivalent coating. If you are looking for high quality, high purity and cost-effective Iron oxide, or if you require the latest price of Iron oxide, please feel free to email contact mis-asia.