The field of application of organic pigments.
Due to its wide variety, bright color and good tinting strength, organic pigments are widely used in industrial fields such as ink printing, coatings, plastics and rubber, and become indispensable coloring materials for the production of various industrial products. Pigment is an additive to downstream products and its application in subsequent products is a physical dispersion process. Due to the various characteristics of the application environment such as ink, paint, plastic rubber, etc., the properties of the pigments used therein are also different. For example, compared with printing inks, the pigments for coatings are resistant to light, weather, heat and chemicals. There is a higher demand for opacity, which requires pigment manufacturers to develop dosage forms suitable for different applications. High-performance organic pigments including benzimidazolone series, macromolecular series, azo pigments, isoporphyrin pigments and intermediates are superior in light fastness, high temperature resistance and migration resistance. It has made up for the shortage of classic organic pigments and has been widely used in high-end fields such as high-grade inks, advanced coatings, plastics and rubber. The final products are widely used in automobiles, architectural decoration, food and medicine packaging, outdoor advertising, printing, electrical appliances and other industries. Benzimidazolone series pigments and macromolecular series pigments have good heat resistance, light fastness and migration resistance, and can meet the needs of production, processing and application in ink, paint and plastic industries. Since rubber pigments are required to have vulcanization resistance, it is necessary to test the suitability of the product.
(1) Application in ink
Ink is the largest consumer of organic pigments, accounting for 55% to 60% of total consumption. In recent years, various inks with different characteristics have developed rapidly, and the application performance has been continuously improved, especially in the field of packaging paper and plastics, both in terms of variety and production. With the development of printing and decorating industry printing technology, printing equipment and the consumption of cultural goods, higher requirements are placed on organic pigments not only in quantity but also in quality. The main properties required for high-grade ink colorants include: 1 bright color, high color saturation, high color strength and high gloss; 2 in four-color printing, yellow pigment should have excellent transparency to match color reproduction. Quality requirements; 3 good ink printing adaptability, such as the fluidity of the pigmented ink, thixotropic, etc.; 4 solvent ink coloring organic pigment should have good solvent resistance, no color change, no increase in coloring ink Viscosity; 5 Some areas limit or disable pigments containing heavy metals.
Ink system requirements for organic pigments are mainly color, tinting strength, transparency and hiding power. Benzimidazolone pigments are often used in the manufacture of advanced printing inks, especially durable products that require extremely high light fastness or Coloring agents for consumer products, such as outdoor advertising. Benzimidazolone pigments are often used in the printing of polyvinyl chloride or other plastic films due to good solvent resistance and migration resistance. Because of their good migration resistance, solvent resistance and recoatability, macromolecular pigments and the like are also often used in the production of high-grade inks.
(2) Application in coatings
A coating is a chemical material that is applied to the surface of a object and forms a film that imparts protection, beautification, or other desired effects. The pigments for coatings generally take into account the dispersibility, optical properties, fluidity and various fastnesses of the pigments. Compared with printing inks, pigments for coatings have higher requirements for light resistance, weather resistance, heat resistance, chemical resistance, hiding power and the like. The properties required for advanced coatings mainly include: 1 durability, light and weather fastness; 2 high hiding power or specific transparency, high tinting strength and gloss; 3 good matching in different types of color materials Sex and easy to disperse performance; 4 chemical resistance, acid and alkali resistance; 5 good storage stability, no delamination or precipitation; 6 excellent heat stability; 7 restricted or prohibited in some areas containing heavy metals pigment.
In the coatings industry, benzimidazolone organic pigments can be used throughout the paint industry to produce a wide variety of industrial paints to meet the coloring requirements of industrial machinery, agricultural machinery and accessories. Many benzimidazolone pigments meet the automotive lacquer application requirements, and some even meet the highest standards of use and are widely used in the manufacture of automotive original topcoats, refinishes and metallic lacquers. Due to their good migration resistance, solvent resistance and recoatability, macromolecular pigments are also often used in the production of paints, such as architectural paints, latex paints, etc., as well as some varieties used to modulate the original finish of automobiles. And refinishing.
(3) Application in plastics
The development of synthetic plastics not only increases the demand for colorants, but also puts higher demands on the quality of colorants according to the characteristics of coloring objects, coloring processes and processing conditions. The properties required for advanced plastic colorants include: 1 excellent heat stability and stability; 2 excellent migration resistance, no blooming; 3 good compatibility with resin and easy dispersion; 4 outdoor plastic products The organic pigments for coloring should have excellent light fastness and weather fastness; 5 food packaging and colored plastics for toys strictly limit the content of harmful heavy metals therein.
In the plastics industry, benzimidazolone pigments are widely used for their relatively good thermal stability. At the same time, because many benzimidazolone pigment varieties do not affect the distortion of polyolefin injection molded articles, they can be used for thick-walled, large, asymmetric injection molded articles. In the plastics industry, macromolecular pigments are used in polyvinyl chloride and polyolefins, and because of their high molecular weight, they have very good migration resistance in the matrix. The macromolecular pigment has good heat resistance, and can meet the requirements of soft polyvinyl chloride and rigid polyvinyl chloride. It is also often used for the coloration of synthetic fibers, such as the coloration of polypropylene and acrylic. The finished textile has good application properties.
(4) Application in rubber
The rubber is processed by a hot rolling mill or a mixer. The operating temperature is 100 ° C ~ 110 ° C and the temperature during vulcanization can reach 140 ° C ~ 200 ° C. Therefore, the pigment should have sufficient heat resistance and vulcanization. Discoloration. Both the hot rolling mill and the mixer use shear forces to disperse the pigment, and the dispersion effect is not as significant as the grinding. For this reason, the pigment is required to be soft and easy to disperse, and the pigment for rubber coloring also requires excellent light resistance. In the rubber industry, benzimidazolone pigments are widely used for their relatively good thermal stability. The development of downstream industries continues to drive the demand for organic pigments, especially high performance organic pigments. With the improvement of living standards, people are more and more concerned about the quality of life, and are willing to replace the original products with products that are safer, more environmentally friendly and better. The high-performance organic pigments satisfy the customers with their excellent performance. demand.