Application of iron oxide pigments in coatings

iron oxide pigments because of their non-toxic, non-permeable color, low cost, and can form a variety of different hues of characteristics, is widely used in coatings, paints and inksCoatings are made up of film-forming substances, pigments, fillers, solvents and additivesIt has been developed from oily coatings to synthetic resin coatings, all kinds of coatings are inseparable from the application of pigments, especially iron oxide pigments have become an indispensable pigment varieties in the paint industryiron oxide pigments applied to coatings are iron yellow, iron red, iron brown, iron black, mica iron oxide, transparent iron yellow, transparent iron red, as well as translucent products, of which a large area of iron red is the most importantiron red has good heat resistance, does not change color at 500 degrees C, does not change the chemical structure at 1200 degrees C, is extremely stableCan absorb the ultraviolet spectrum in the sun, so the coating has a protective effect, resistant to dilute acid, alkali, water, solvent resistance, so that it has a very good weather resistanceiron red particle size in 0.2 m with yellow phase, than the surface area, oil absorption is also larger, the particle size increases when the color from the red phase purple movement, than the surface area, oil absorption is also smallerIron red is used in a large number of rust-proof coatings with physical anti-rust function, moisture in the atmosphere can not penetrate into the metal layer, and can increase the density of the coating and mechanical strengthiron-red water-soluble salts applied to anti-rust paint should be low, which is conducive to improving rust-proof performance, especially when chlorine ions increase, water is easy to penetrate into the coating, but also to accelerate metal corrosionmetal is very sensitive to acidity, so the ph value of resin, pigment or solvent in the coating is more acidic than 7, it is easier to promote metal corrosion, after long-term exposure to the coating of iron red paint is easy to produce powdering phenomenon, especially the smaller particle level of iron red pink ingenium faster, so to improve weather resistance should choose a larger particle size of iron red, but also easy to make the coating gloss declinethe change of the color of the paint is usually caused by one or several of the pigment components of flocculation phenomenon, pigment wetting poor and wetting agent too much, is often the cause of flocculation, after roasting pigment has a greater flocculation tendency, so in order to make the paint color uniform, should choose the wet synthetic iron red is appropriateThe coating surface made of needle-shaped iron red is easy to produce the influence of silk light, and the stripes produced when painting are observed from all angles, and the color intensity is different, which is related to the different refractive index of the crystallizationsynthetic iron red compared with natural products, the former has a large rife density, small particle size, high purity, good cover, high oil absorption, strong coloring, in some paint formulations, natural iron red and synthetic products common, such as for vehicles, machines, instruments and other black metal surface base ingested with iron-red alcohol icingiron yellow and iron red, like a very good light resistance, solvent resistance, alkali resistance, acid resistance and other characteristics, its heat resistance is slightly worse, in 135 degrees C/1h and 177 degrees C/5min heat treatment, due to the gradual loss of crystalline water and the red phase transformation, so can not be applied to drying temperature higher paintsynthetic iron yellow coloring force is high, color light is brighter, according to the need to create a variety of color iron yellow, abrasive is also better, with the role of shielding ultraviolet radiation, can extend the application life of the coatingbecause of the low price, iron yellow can be stable type of indigo blue, iron blue, etcwith green, and iron red, iron black and so on with brownin the paint iron yellow application and quantity are less, alone use smaller, more and iron red, oil smoke and other pigments mixed, the application of the paint should control the drying temperature to prevent the temperature too high color turn redIn latex paint coloring, can be added a small amount of ferro-yellow color slurry to make beige, light resistance than the organic yellow with single-a-side nitrogen is better than sun-resistant yellow, can also be mixed to use, to take organic yellow brightness and iron yellow durabilityiron brown, iron black natural iron brown often contains carbon, manganese oxide and other doped substances, synthetic products are iron black, iron red and iron yellow mix, has a higher coloring and coveriron brown can absorb almost all the spectrum of ultraviolet, so the camouflage coating made of iron brown has the same infrared reflection as trees, grasses, sand, etc., so that infrared photography in the air can not determine the camouflageiron black can also be used to prepare primers, used in vehicles, transportequipment metal bottoming, than carbon black easier to grind