Inorganic dyes according to color classification:

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

A black pigment

Second only to the white pigment of the important pigments. The main varieties are carbon black. The performance of the pigment with carbon black is different from that of rubber processing. The main quality indicators of pigment carbon black are blackness and hue. Carbon black is an inorganic pigment colorant for plastics that is second only to titanium dioxide. Carbon black according to the processing method of classification, variety, used as a pigment is generally known as "pigment carbon black". Carbon black not only has a coloring performance, but also has excellent weather resistance and thermal oxidation.

Second, red paint

Inorganic pigments in the red pigment, mainly iron oxide red. Iron oxide has a variety of different colors, from yellow to red, brown until black. Iron oxide is the most common iron oxide pigment. Has a good hiding power and color strength, chemical resistance, color retention, dispersion, the price is cheaper. Iron oxide red for the production of floor paint, ship paint, due to significant anti-rust performance, but also the production of anti-rust paint and primer the main raw material. When the particles of iron oxide red are ground to? 0.01μm, the hiding power of the pigment in the organic medium is remarkably decreased. This pigment is called transparent iron oxide, which is used to make transparent paint or metallic flash paint. Better color retention.

Three, yellow pigment

There are lead chrome yellow (lead chromate), zinc chrome yellow (zinc chromate), cadmium yellow (cadmium sulfide) and iron yellow (hydrated iron oxide) and other varieties. Which is the most widely used lead chrome yellow, the largest output. The world's annual output of about 180kt, China's annual output of about 10kt. Lead chrome yellow hiding power, bright color, easy to disperse, but in the sunlight is easy to darken. Zinc chrome yellow hiding power and color strength are lower than the lead chrome yellow, but the color is light, good light resistance. Cadmium yellow has good heat resistance, light resistance, bright color, but the color strength and hiding power as lead chrome yellow, the cost is higher, in the application is limited. Lead chrome yellow and cadmium yellow are heavy metals, can not be used for children's toys, cultural and educational supplies and food packaging coloring. The yellowish color is dark, but the durability, dispersibility, hiding power, heat resistance, chemical resistance, alkali resistance are very good, and the price is low, so widely used in building materials coloring.

Lead chrome yellow

Lead nitrate or lead acetate and lead dichromate (or potassium dichromate), sodium hydroxide, aluminum sulfate and other raw materials, according to different ratio, different reaction conditions, can produce a variety of color lead chrome yellow.

Zinc chrome yellow (zinc yellow)

The zinc oxide suspended in water, and then add potassium dichromate and chromic acid, that is, the basic potassium zinc phosphate K2CrO4 · 3ZnCrO4 · Zn (OH) 2 is zinc chrome yellow pigment. Also useful sulfuric acid or hydrochloric acid instead of part of the chromic acid, but the formation of potassium sulfate or potassium chloride, must be filtered before drying thoroughly washed away. Alkaline zinc chromate can be used as lemon yellow pigment, can also be made with iron oxide red primer. Another kind of zinc chrome yellow is made with zinc oxide with chromic acid, also known as four salt zinc chromate ZnCrO4 · 4Zn (OH) 2, used to make phosphating primer.

Cadmium yellow

Cadmium and yellow are pure cadmium and barium sulfate co-precipitation of cadmium and yellow two. Adding a solution of sodium sulfide or sodium sulfide and sodium selenate to the aqueous solution of cadmium salt, precipitating cadmium sulfide or cadmium sulfide, washing and filtering, calcining at 500 to 700 ° C in a kiln (see kiln) That is, from lemon yellow to orange-red different color of the pigment cadmium or cadmium red.

Iron yellow

Natural iron oxide is a kind of impurities containing hydrated iron oxide, containing impurities, mainly silicate. In the past, the preparation of iron oxide yellow to nitrobenzene to reduce the production of aniline when the waste as raw material. Another production method is in the presence of iron and oxygen, the ferrous sulfate heated to hydration, that is, the formation of iron oxide yellow. The thermal stability of iron oxide yellow is poor, heated to 180 ° C or more, that is, dehydration and become iron oxide red.

Four, green paint

There are two kinds of chromium oxide and lead chromium green. Chromium oxide green light resistance, heat resistance, excellent chemical resistance, but the color is dark, color strength, hiding power are poor. Lead chromium green durability, 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 reduced.

Chromium oxide green

Also known as chromium trioxide, with chromic anhydride, sodium dichromate (or potassium, ammonium) and carbon or sulfur by high temperature roasting, the color from bright green to dark green. Used for metallurgical products, cement coloring. Its high hardness, can be used for optical materials and metal polishing with the polishing agent; its spectral reflection characteristics are close to the chlorophyll, it can be used for military camouflage paint.

Lead chrome green

Is a mixture of chrome yellow and iron blue, in the chrome yellow manufacturing process by adding iron blue wet pulp made of iron to adjust the amount of how much can be obtained from the yellow green (2% ~ 3% iron blue) to dark green 60% to 65% iron blue) of the different color of the green pigment. Lead Chromium Green can be used for general coatings. There is also a mixture of chrome yellow and phthalocyanine blue (see organic pigments), also known as lead chrome green, this pigment bright color, other performance is also better.

Five blue pigment

Mainly iron blue, cobalt blue, ultramarine and other varieties. Which group of large green production, ultramarine acid is not acid, bright and bright color, high temperature. Iron blue acid resistant alkali, hiding power, color strength is higher than the ultramarine, durability than the group of poor. Since the phthalocyanine blue into the market, because of its color strength than iron blue twice as high, other performance and good, so the amount of iron blue decreased year by year. Cobalt blue high temperature, light resistance is excellent, but the color strength and hiding power is slightly worse, the price is high, the use is limited.

Iron blue

From ferrous sulfate, yellow blood salt (potassium ferrocyanide), ammonium sulfate reaction to produce white pulp, and then oxidized from chlorate. Blue light blue called China blue (China blue), red iron blue called milrow blue (milori blue). Iron blue for the hydrophilic pigments, and grease, resin and other media affinity is poor, with surfactant treatment, can improve its lipophilic, easy grinding performance, made of iron blue dark blue paint, after exposure to the surface Easy to produce copper phenomenon. Mainly used in the manufacture of ink and cultural and educational supplies.

Six, brown pigments

Iron oxide brown oxide brown

1, Product Overview: Molecular formula Fe2O3 · nH2O, iron brown mixed products with iron oxide, iron oxide yellow characteristics, iron brown also has a large color range, strong adaptability and other major features, compared with iron oxide, iron yellow The scope of application is more extensive, more applicable to 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 and transportation conditions: stored in a dry place, do not make moisture, to avoid high temperature, and isolated with acid and alkali. According to the above custody conditions, the unpackaged product has an effective storage period of three years.
Product Name: Iron Oxide Brown Model: 610/686/860/868

Seven other categories

Ultramarine
The following are the same as the "
From clay, sulfur, soda ash, mirabilite, carbon black and quartz powder in accordance with the different recipe mix, installed in the pot, the high temperature roasting, and then washed and other refined process made. Products can be light blue to dark blue. Mixed with ammonium chloride by heat treatment, can be made of pink, purple pigment. Used for painting pigments, rubber, plastic, paint and so on. Group of green case of calcium hydroxide white, it can not be used for cement coloring.