Pigment is a kind of very important chemical raw material, widely used in coating, ink, plastic and other industries. It is generally divided into inorganic pigments and organic pigments. The following mainly introduces the commonly used pigments in powder coating powder.
Powder coating powder is the fastest growing coating variety at home and abroad in recent years because of its high utilization rate, environmental protection, no pollution, good physical and chemical properties, one spray molding and many other advantages.
According to the structure, organic pigments are divided into azO pigments, phthalocyanine pigments, heterocyclic and thick cyclic ketone pigments, OXanthracene lake pigments, triarylmethane and its lake pigments, nitro and nitroso pigments, methylimine and its metal complex pigments, fluorescent pigments.
1.1 Azo pigments
Organic pigments HAVE the largest variety and the most important category, and the output is the largest among organic pigments, accounting for about 60%. According to the chemical structure, they can be divided into single azo pigments and double azo pigments, and can be subdivided into three categories: insoluble azo pigments, azo dye lake and condensed azo pigments. According to the characteristics of the intermediate can be divided into:
1.1.1 Benzidine pigments
Biazo pigments are composed of benzidine derivatives. Benzidine pigments are mainly yellow and orange in the chromatographic range, and their performance is far better than that of single azo pigments.
Chemical production of solid yellow HR, pigment yellow PY83, red yellow powder, light resistance grade 7 temperature resistance 220, from polychlorobenzidine eye salt through digitization. Can be used outdoors, but is not suitable for trace addition in powder.
1.1.2 Azo condensation pigments
The structure of the pigment contains aromatic diamond derivatives linked with peptide bonds. The pigment can be obtained by direct coupling of the aromatic diamine diazo salt with the aromatic diamine derivatives, or by condensation of the product already coupled with the aromatic diamine. Due to the increase of molecular weight, the pigment has improved its resistance to migration, sun resistance, heat resistance and other indicators.
1.1.3 2, 3-acids and their lake pigments
Lake pigment is produced by the reaction of 2, 3-acid as the main component of the coupling chromogen and metal salts. Most are mono pigments, but condensed azo types are also available. Its chromatographic range is mainly magenta (blue red)
Baohong 6BR, pigment red PR57:1, alias Risol Baohong BK, blue dark red powder, bright color, strong coloring power, good fluidity in the powder, and has good stability. Light resistance level 6, for indoor use.
Permanent red F5RK, pigment red 48:2, purple red powder, acid and alkaline resistance is slightly poor, while the coloring ability is strong, sun resistance and heat resistance is general.
1.1.4 naphthol sulfonic acid pigments
A variety of naphthol sulfonic acid and arylamine diazo salt reaction, and then through the deposition process to obtain the mono red lake pigment, the pigment has low colouring power, light resistance is not high.
1.1.5 Pyrazole and quinacridone pigments
The monoazo pigment obtained by coupling pyrazole and quinazolinone has excellent fastness to sun and weather, and its chromatographic color is orange and red.
1.1.6 Pyrazolone pigments
The pigment obtained by reaction with aryl presence as coupling component includes monoazo and azo pigments, whose chromatogram ranges from yellow to orange.
Permanent yellow HGR, pigment yellow PY191, has good acid resistance, alkali resistance, heat resistance, temperature resistance, 300, light resistance, 7-8 grade, from 2B- acid by diazotization reaction. Can be added in trace amounts for outdoor use
1.17 Benzimidazolone pigments
Single and double azo pigments with benzodiazepine in the side chain of the coupling component. The molecule contains hydrogen bonds, which increase the molecular polarity of the pigment, and the pigment has very excellent heat resistance, light resistance and solvent resistance.
2.2 Phthalocyanin pigment
Mainly phthalocyanine blue and green high-grade organic pigments, the yield and dosage are large, among which the blue and green spectrum of organic pigments are important sources, bright color, good fastness.
Phthalocyanine blue BGS, pigment blue PB15:3, β-stable, deep blue light powder, bright color, strong coloring power, excellent sun resistance, heat resistance, chemical resistance. It is synthesized from benzene anhydride, urea and chlorobenzene, and then the α type is converted to β type by adding additives.
Phthalocyanin green G, pigment green PG7, dark green powder, bright color, strong coloring power, insoluble general solvent, excellent fastness, belonging to copper phthalocyanine chlorinated non-fading pigments, generally prepared by crude copper phthalocyanine direct chlorination, the number of atoms generally introduced is 14-15.
2.3 Heterocyclic and thick cyclic ketone pigments can be divided into quinacridone pigments, dioxide pigments, anthrone pigments, etc.
2.3.1 Quinacridone pigments
It IS A KIND OF HIGH-GRADE PIGMENT, with EXCELLENT FASTNESS, bright color, strong coloring power, good weather resistance, heat resistance, migration resistance, widely used in automotive coatings, plastics and other coloring. Its chromatography has red, purple and orange.
Such as pigment quinacridone violet ER, pigment violet PY19 (β type), brilliant purple powder, bright color light, strong coloring power. Excellent insolation resistance of grade 7-8, temperature resistance of 250, solvent resistance, no migration.
Yongse peach Pink E, pigment red PY122, alias quinacridone red 1171, bright blue violet red powder, temperature resistance 300, light resistance level 8, the dosage is 20% less than domestic, the effect is similar to Clariant Pink E
2.3.2 Dioxazine pigments
This kind of pigment contains tropotaxis parent, its chromatography is mostly purple, generally has a symmetrical structure.
Permanent VIOLET BL, pigment VIOLET PV23, BLUE VIOLET powder, bright color, high coloring power, excellent heat resistance, permeation resistance and sun resistance, obtained from tetrachlorobenzene quinone, ethyl carbazole, benzyl trimethyl ammonium chloride polymerization by benzene sulfonyl chloride treatment, heat resistance 250 light resistance 7-8. High temperature for a long time baking color phenomenon.