Stunning paint world

Pigments are substances that can color objects. Pigments are soluble and insoluble, with inorganic and organic differences. Pigment A powdered substance used for coloring. It does not dissolve in media such as water, grease, resins, organic solvents, etc., but it can disperse evenly in these media and can color the media, but it also has a certain hiding power.

Pigments are indispensable raw materials for the manufacture of paints, inks, oil paints, make-up paints, and colored papers. It is also used for filling and coloring of plastics, rubber products, and synthetic fiber stocks.

From the chemical composition, pigments can be divided into inorganic pigments and organic pigments. The sources can be divided into natural pigments and synthetic pigments. Natural pigments are sourced from minerals such as: cinnabar, red earth, realgar, malachite green and heavy calcium carbonate folk painting pigments, wollastonite, barite powder, talcum powder, mica powder, kaolin, and so on. For biological sources, such as from the animals: cochineal red, natural scales, etc.; from the plants: garcinia, alizarin red, indigo and so on. Synthetic pigments are artificially synthesized, such as titanium dioxide, zinc white, lead chrome yellow, iron blue and other inorganic pigments, as well as organic pigments such as big red powder, even light yellow, phthalocyanine blue, quinoquinone and the like.

The rust-proof pigments, magnetic pigments, luminescent pigments, pearlescent pigments, conductive pigments, and the like classified by the function of pigments. Sorting by color is a convenient and useful method. Such pigments can be classified as white, yellow, red, blue, green, brown, purple, black regardless of their source or chemical composition. The well-known Color Indes is based on color classification: if the pigment is divided into pigment yellow (PY), pigment orange (PO), pigment red (PR), pigment violet (PV), pigment blue (PB) , Pigment Green (PG), Pigment Brown (PBr), Pigment Black (PBk), Pigment White (PW), Metallic Pigment (PM) and other ten categories. Pigments of the same color are numbered according to the order. For example, titanium white is PW- 6, Lithopone white PW-5, lead chrome yellow PY-34, quinoline ketone PR-207, red iron oxide PR-101, phthalocyanine blue PB-15 and so on. In order to find the chemical composition, there is another structure number, such as titanium white PW-6C. I. 77891, Phthalocyanine blue is PB-15C. I. With the 74160, pigment manufacturers and users can find out the composition and chemical structure of the pigments listed. Therefore, it has been widely used in the international pigment import and export trade industry. Some domestic pigment manufacturers also use this pigment's international classification standard. China's pigment national standard GB/T3182-1995 also uses color classification. Each color of the pigment has a mark, such as white BA, red HO, yellow HU, and then combined with the chemical structure of the code and serial number of the composition of the pigment model, such as rutile titanium white BA-01-03, medium chromium yellow HU-02-02, red iron oxide HO-01-01, lithopone white BA-11-01, **amine red HO-02-01, BGS phthalocyanine blue LA-61-02, and the like.

Pigments can be classified according to the class of compounds they contain: Inorganic pigments can be subdivided into oxides, chromates, sulfates, silicates, borates, molybdates, phosphates, vanadates, iron cyanates. , hydroxides, sulfides, metals, etc.; organic pigments can be divided into azo pigments, phthalocyanine pigments, quinones, steroids, quinoquinone, dioxazine and other polycyclic pigments, aromatic methane, according to the chemical structure of the compound. Department of pigments. Classification from the production point of view can be divided into titanium pigments, iron pigments, chromium pigments, lead pigments, zinc pigments, metal pigments, organic synthetic pigments, this classification method has practical significance, often a system can Representing a pigment professional production industry.

Pearlescent pigments consist of several thin layers of metal oxide coated mica. Changing the thin layer of metal oxide can produce different pearlescent effects. Compared with other pigments, pearlescent pigments have unique soft pearl luster with unparalleled effects. The special surface structure, high refractive index and good transparency make it possible to create the same effect as pearl sheen in a transparent medium.

Iron oxide, alias magnetic iron oxide red; high permeability iron oxide; burned brown iron ore; burning saggers; iron dan; iron powder, red powder; Venetian red (mainly iron oxide), ferric oxide. Chemical formula Fe2O3, soluble in **, is a red-brown powder. Its reddish-brown powder is a low-grade pigment, and it is industrially known as red iron oxide. It is used in the industries of paint, ink, rubber, etc. It can be used as a catalyst, a polishing agent for glass, precious stones and metals, and can be used as a raw material for ironmaking.

Phthalocyanine is a compound with a large conjugation system of 18 electrons. Its structure is very similar to that of porphyrins widely found in nature. However, unlike porphyrins, which play an important role in living organisms, phthalocyanines are different. It is a completely synthetic compound. In 1928, at the Grangemouth plant of the Scottish Dyestuffs plant, during the preparation of a large amount of phthalimide from benzoic anhydride, the reaction was exposed directly to the steel shell of the pipe due to the rupture of the glass pipe. It was surprisingly found that Some blue impurities were produced in the white phthalimide. Because of the bright colors of these impurities, and the high stability of the air even acid and alkali, it was later isolated as a dye. Used as a enamel, plastic, paint, rubber products dyes.