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What Is The Definition And Research Status Of Organic Pigments?

The organic pigment refers to an organic substance which is insoluble in water and uses a medium, and coloring the colorant in a highly dispersed particulate state. Compared with inorganic pigments, organic pigments have their own unique properties, including varieties, wide range of chromatography, bright colors, high color strength, good chemical stability, bright colors, it is suitable for fabric dyeing, pulp coloring and modulation printing ink Or a colorant for high-grade paint. In addition, the organic pigment products toxicity, and inorganic pigments most varieties containing heavy metals, such as red, red, etc., are a certain toxicity. Organic pigments are widely used in ink, paint, plastics, rubber, cosmetics and textile printing and dyeing. With the development of industrial technology in the field of application, the organic pigment products are constantly updated and higher requirements, such as high-grade pigments and some other high-grade pigments that can meet the durability, heat resistance, solvent resistance and migration resistance of metal surface coatings. Organic pigments varieties. On the other hand is the organic pigment formulation, the development of special applications with a special range of products, such as water, oily, easy to disperse, granular, color tablets, paste, high transparency, high color strength products. Finally, there are some organic pigments with high purity and special crystal form.

Organic pigments are divided into polymer pigments (polymer pigments) and small molecular pigments according to their molecular weight.

(1) Polymeric pigments

Polymeric pigments are developed in recent years, a class of functional pigments, it is through free radical polymerization. Polymerization, polycondensation, coordination polymerization and macromolecule modification. The dye is introduced into the main chain or side chain of the polymer, and the polymer is easy to form film, high strength, solvent resistance and resistance. Thermal properties and excellent properties of colorants for strong absorption and versatility of light. The properties of polymer pigments, such as heat resistance, washability and fastness properties, have been widely concerned after being put forward, and have become a new field of functional polymer materials and dye chemistry. However, these polymer pigments at room temperature, atmospheric pressure is very stable, the use of waste is difficult to degrade, resulting in a new environmental pollution, affecting the renewable resources.

(2) small molecule organic pigments

Small molecule organic pigment structure of a wide range, according to the molecular contained in the functional groups can be divided into azo pigments, phthalocyanine pigments, acid (alkaline) dyes. Lake pigments, heterocycles and condensed ketone pigments. Due to different structure led to its application performance is very different, different types of pigment applications are not the same.

With the increasing voice of environmental protection, the development of alternative small metal pigments containing heavy metal pigments is a development trend of organic small molecular pigments. CI Pigment Brown 25 High hiding power non-transparent products can be applied to coatings, plastics, and Ink coloring. CI Pigment Yellow 3 and 4, with good acid and alkali and can issue pure greenish yellow; CI Pigment Yellow 74 has good hiding power and good light resistance, can replace chrome yellow for dry lacquer, nitrocellulose , Outdoor paint. C.I. Pigment Orange 73, is a DPP pigment, with pure orange, can replace lead-containing inorganic pigments for powder coatings and high-grade car paint mouth. Organic fluorescent pigments have been used in safety labels, inks, billboards, plastics, toys and so on because of their unusually beautiful colors. Later, Ciba, BASF and Clariant developed azocoumarin series of fluorescent pigments, benzothio or anthraquinone series of fluorescent pigments and pyrrolopyrrolidone series of fluorescent pigments and other commodities have entered the market.

The first proposed hidden pigment technology, hidden pigment technology has been rapid development. The hidden pigment and polyester mixed dissolved, its heating, the mother pigment precipitation, remove the solvent, the polyester coloring effect is good, high transparency. The use of hidden pigment for the preparation of optical filters, have achieved the ideal results do not dissolve in water organic solvent prepared into the emulsion to replace the ink, so that each Parazak with hidden pigment, water, water-insoluble organic solvent prepared into the emulsion After the ink is replaced, the ink is ejected in the form of liquid, and the desired color is displayed on the printing medium by heating or light irradiation, and the recessive pigment is converted into the mother pigment to effectively solve the drawbacks of the ink jet printer. In the production of lithographic offset printing and photographic development also has hidden pigment applications.

Pigment effects include three parts: the production of pigments used in the media, the use of pigments and waste disposal. In general, organic pigments are insoluble, so most of them are very toxic, so the impact of the pigment on the ecology mainly from the preparation of paint when the waste gas, waste water and the use of environmentally friendly pigment treatment.

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