Development direction of organic pigment industry technology

The development of organic pigment industry technology is the same as other industrial technologies With the continuous expansion of its application field, higher requirements are put forward to promote the development of related technologies in a deeper direction The requirements for its organic pigment products can be summarized as follows: ① the high-grade products meet the requirements of durability, weather fastness, heat resistance, solvent resistance, and migration resistance of metal surface coating; ② the formulation of organic pigment develops special products with special application performance, such as water-based, oil-based, easy to disperse type, with high transparency, heat resistance and migration resistance It is a new special dosage form with high purity, special crystal form and special functional organic pigment
The requirements of the application department promote the rapid development of the organic pigment industry technology From the classical organic unit synthesis reaction (such as halogenation, nitration, reduction, condensation, diazotization, coupling reaction), filtration, separation, drying, comminution process, it gradually permeates the multidisciplinary fields, such as solid physical chemistry, morphology, powder surface chemistry, interface chemistry, solid solution and crystallization chemistry, high Molecular chemistry and powder dispersion technology Among them, the outstanding research focuses are the development of new structural pigments, surface modification of colored crystal particles, effective pigment dispersion technology, commercialization of organic pigments and the detection and evaluation of application performance (1) the development of new chemical structure pigment varieties aims to improve the durability, heat stability, climate fastness, solvent stability and migration resistance of the pigment; the yellow, orange, red, purple and brown varieties with bright color and high coloring intensity, so as to meet the requirements of matching with the excellent blue and green copper phthalocyanine pigments The main way is to synthesize new heterocyclic pigments with good molecular planarity Symmetry, containing specific substituents, changing molecular polarity, can form intermolecular hydrogen bond, improve heat stability and migration resistance According to the classification of pigment durability (light resistance, climate fastness, heat stability, solvent resistance, migration resistance, etc.), high-grade (high-performance) organic pigments, such as hop or HGP (high performance organic pigments; high grade pigments), not only have excellent application fastness, but also have high added value There is no doubt that increasing high-grade organic pigment products to meet the requirements of special dosage forms and high performance in the application field will be an important trend in the future The data show that the output value of high-grade organic pigments (including quinacridone, perylene, anthraquinone, isoindolinone, DPP red and azo with special structure) is higher than that of 75000 t (33%) phthalocyanine, though the output value is only 18000 t (8%), which is equivalent to 120000 t ordinary azo pigments (57%), accounting for about 35% of the output value (2) new synthesis technology of special intermediates for organic pigments Based on the special requirements of the structure and quality of intermediates for the synthesis of organic pigments, new synthetic processes for different intermediates are studied, such as opening up new basic materials, changing the synthetic process, reducing the formation of isomers or studying specific separation and purification methods; developing non carcinogenic intermediates to replace some banned aromatic amine intermediates New processes of general concern, such as the preparation of aromatic amine derivatives by catalytic hydrogenation reduction process, and the phase transfer catalytic reaction technology for alkylation under atmospheric pressure, can reduce the emissions of three wastes, contribute to environmental protection, reduce costs, and improve the internal quality of the final pigment products (3) dispersion process, research on auxiliary agents related to powder technology expansion In order to ensure the effective dispersion of pigment particles in coatings, plastics, inks and pigment printing pastes, in order to obtain fine particle size, concentrated distribution, good wettability, surfactant addition and dispersion equipment are closely related It should be devoted to the development and application of new, efficient, multifunctional wetting and dispersing additives (4) modification, deep processing and commercialization of organic pigments In the use process, the organic pigment particles are evenly dispersed in the oil and water-based application medium In order to make them well wetted and dispersed, the surface modification of the synthesized pigment particles must be carried out to endow the pigment particles with higher lipophilicity or hydrophilicity, so as to achieve a good matching with the use medium Pigment makers try to modify the surface of the paste and powder particles in the synthesis process Develop a variety of organic pigment modification processing technologies, such as pine soap treatment; surfactant and new polymer surfactant (Hyperdispersant) treatment; pigment derivative modification process; grinding treatment; organic solvent treatment; acid dissolution or acid expansion process; extrusion and phase inversion kneading process; organic amine modification process; masterbatch preparation technology; microcapsule coating technology and no Modification of organic compounds Through a variety of specific surface modification and deep processing, the commercial pigment dosage forms with application performance meeting the use requirements are finally prepared (5) the evaluation of the application performance of organic pigment is to ensure the internal quality of the product, develop new structure and new dosage form products according to the user's demand; improve the product grade and increase the competitive strength, and each manufacturer carries out the analysis, monitoring and testing of raw materials, process and pigment products through the physical and chemical (instrument) analysis method The quality of pigment products includes the evaluation of pigment's own performance (such as moisture, relative density, ash, water soluble matter, pH value, oil absorption, crystal form and particle size, etc.) and coloring performance (such as coloring power, color phase, hiding power, transparency, light resistance, heat resistance, migration resistance, dispersion and dispersion stability, etc.).