Inorganic pigment classification

According to the color classification

Inorganic coloring pigments can be divided into two types of achromatic pigments and color pigments. Achromatic pigments include a series of pigments ranging from white, gray to black that exhibit only a difference in the amount of reflected light, ie, the difference in brightness. Color pigments can be a certain wavelength of light, selectively absorbed, the rest of the wavelength of light reflected and present a variety of different colors.

Black pigment is second only to the important pigment of white pigment. The main species is carbon black. The performance of carbon black pigment and rubber processing with different. Pigment black main quality indicators are blackness and hue. Carbon black is an inorganic pigment colorant for plastics second only to titanium dioxide. Carbon black by processing methods, a wide variety, used as a pigment is generally called "pigment black." Carbon black not only has a coloring property, but also has excellent weather resistance and thermal oxidation resistance.

Red pigment inorganic pigment red pigment, mainly red iron oxide. Iron oxide has a variety of colors, from yellow to red, brown until black. Iron oxide red is the most common iron oxide pigments. Has a good hiding power and tinting strength, chemical resistance, color retention, dispersion, the price is cheaper. Iron oxide red for the production of floor paint, marine paint, due to significant anti-rust properties, but also the main raw material for the production of anti-rust paint and primer. Reduce the particles of iron oxide red to ≤ 0.01μm, the hiding of pigments in organic media significantly decreased, this pigment is called transparent iron oxide, used to make transparent paint or metal flash paint, than the use of organic dyes have Better color retention.

Yellow pigments are lead chrome yellow (lead chromate), zinc chrome yellow (zinc chromate), cadmium yellow (cadmium sulfide) and iron yellow (hydrated iron oxide) and other varieties. Lead chrome yellow which the most widely used, the largest output. The world annual output of about 180kt, China's annual output of about 10kt. Lead chrome yellow hiding power, bright color, easy to disperse, but easy to darken in daylight. Zinc chrome yellow hiding power and tinting power are worse than lead chrome yellow, but the color light, good light resistance. Cadmium yellow has good heat resistance, light resistance, bright color, but the coloring power and hiding power than lead chrome yellow, the cost is higher, the application is limited. Lead chrome yellow and cadmium yellow are heavy metals, can not be used for children's toys, stationery and food packaging coloring. Dark yellow ferrous, but durability, dispersion, hiding power, heat resistance, chemical resistance, alkali resistance are good, and the price is low, it is widely used in building materials coloring.

Lead chrome yellow lead nitrate or lead acetate and sodium dichromate (or potassium dichromate), sodium hydroxide, aluminum sulfate and other raw materials, according to different ratio, different reaction conditions, can be made of various colors of lead chrome yellow.

Zinc chrome yellow, also known as zinc yellow. Suspension of zinc oxide in water followed by addition of potassium dichromate and chromic acid gives the basic zinc potassium chromate K2CrO4 · 3ZnCrO4 · Zn (OH) 2 which is a zinc chrome yellow pigment. There are also some sulfuric acid or hydrochloric acid instead of chromic acid, but the generated potassium sulfate or potassium chloride, must be thoroughly washed away before filtration, drying. Potassium Zinc Chromate can be used as a lemon yellow pigment, but also with iron oxide red to make a primer. Another zinc chrome yellow zinc oxide is used with chromic acid reaction was made, also known as the four salt zinc chromate ZnCrO4 · 4Zn (OH) 2, used in the manufacture of phosphate primer.

Cadmium Yellow Cadmium Yellow Pure cadmium yellow and cadmium sulfate co-precipitation of two kinds of cadmium. Adding a mixed solution of sodium sulfide or sodium sulfide and sodium selenide to an aqueous cadmium salt solution to precipitate cadmium sulfide yellow or cadmium sulfide red, washing, filtering, calcining in a rotary kiln (see kiln) at 500-700 ° C., To get a different color from lemon yellow to orange red pigment cadmium yellow or cadmium red.

Iron yellow natural iron oxide yellow is a hydrated iron oxide containing various impurities, impurities, mainly silicates. In the past, the preparation of iron oxide yellow nitrobenzene reduction aniline production waste iron sludge as raw material. Another method of production is to hydrate ferrous sulfate in the presence of iron and oxygen to form yellow iron oxide. Iron oxide yellow thermal stability is poor, heated to 180 ° C or more, that is dehydrated into red iron oxide.

The main green pigment is chrome oxide green and lead chrome green two. Chromium oxide green light, heat, good chemical resistance, but darker color, tinting power, hiding power are poor. Lead chrome green durability and heat resistance are less than chromium oxide green, but bright color, good dispersion, easy processing, due to toxic heavy metals, since the advent of phthalocyanine green and other organic pigments, the amount has been gradually reduced.

Chromium oxide green, also known as chromium oxide, is chromic anhydride, sodium dichromate (or potassium, ammonium salt) and carbon or sulfur roasted at high temperatures, from bright green to dark green. Used for metallurgy products, cement coloring. It has a high particle hardness and can be used as a polishing agent for optical materials and metal abrasives; its spectral reflectance is very close to chlorophyll and therefore can be used in military camouflage lacquers.

Lead chrome green is a mixture of chrome yellow and iron blue, chrome yellow in the manufacturing process by adding iron blue wet slurry from iron blue to adjust the amount of access to obtain from yellow green (2% ~ 3% iron blue) to Dark green (60% ~ 65% iron blue) of various colors of green paint. Lead chrome green can be used for general coatings. Another kind of chrome yellow and phthalocyanine blue (see organic pigments) mixture also known as lead chrome green, this pigment bright color, and other properties are better.

The main blue iron blue, cobalt blue, ultramarine and other varieties. Among them, a large amount of mass production, ultra-alkali group is not acid, bright and bright color, high temperature. Iron blue acid alkali, hiding power, tinting strength higher than ultramarine, poor durability than the crowd. Since Phthalocyanine blue into the market, because of its tinting strength is twice as high as iron blue, other properties and good, so iron blue dosage decreased year by year. Cobalt blue high temperature, excellent light resistance, but the coloring power and hiding power slightly worse, the price is high, the use is limited.

Iron blue from ferrous sulfate, yellow blood salt (potassium ferrocyanide), ammonium sulfate generated white slurry reaction, and then chlorate oxidation. Blue light blue called China blue (blue), red iron blue called milori blue (milori blue). Iron blue as a hydrophilic pigment, and grease, resin and other media poor affinity to surfactant treatment, can improve its lipophilic, easy grinding performance, made of iron blue dark blue paint, the surface after the exposure Easy to produce copper phenomenon. Mainly used in the manufacture of ink and stationery.

Brown paint

Iron oxide brown

1. Product Description: Molecular formula Fe2O3 · nH2O, iron brown blend products with red iron oxide, yellow iron oxide, iron brown also has a large color range, adaptability and other major features, compared with iron oxide red, iron yellow The scope of application is more extensive, more suitable for users.

2. Specifications Model: 610/686/860/868.

3. Uses: Widely used in color cement brick, paint, paint, building materials, rubber, plastics and other fields.

4. Storage conditions: Store in a dry place, do not damp, to avoid heat, and acid-base isolation. According to the custody of the above conditions, unopened packaging effective storage period of three years.

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