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Solvent Black 3,Also known as Sudan Black B, it is an important chemical compound that appears as a dark brown to black powder. It is soluble in organic solvents such as acetone and toluene, slightly soluble in ethanol, and almost insoluble in water. It is stable at room temperature and pressure. It is a commonly used solvent dye that can be used for coloring organic solvents such as hydrocarbons and alcohols, providing a deep black tone. As a histological staining agent, it can be used for staining neutral triglycerides and lipids, as well as bacteria and fats.
In biological experiments, it is also used to distinguish between paraffin and animal fat, as well as for staining with myelin. Although it is stable at room temperature, appropriate safety measures still need to be taken during handling. It may pose potential health and environmental hazards, therefore relevant safety regulations and guidelines should be followed when handling, using, and disposing of it. It should be stored at room temperature, avoiding direct sunlight and humidity.
Additional information of chemical compound:
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Chemical Formula |
C29H24N6 |
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Exact Mass |
456.21 |
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Molecular Weight |
456.55 |
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m/z |
456.21(100.0%),457.21(31.4%),458.21(2.7%),457.20(2.2%),458.21(2.0%) |
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Elemental Analysis |
C, 76.29; H, 5.30; N, 18.41 |
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Melting point |
120-124℃(lit.) |
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Boiling point |
552.68℃(rough estimate) |
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Density |
1.4899 (rough estimate) |
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Solvent Black 3,Also known as Sudan Black B, it is an important chemical dye with a wide range of uses. The following is a detailed explanation of its purpose:
In the textile industry, it is widely used as a solvent dye due to its good solubility and dark black color expression. It is suitable for dyeing various fibers, such as synthetic fibers like polyester and nylon, as well as natural fibers like wool and silk. By selecting appropriate solvents and dyeing processes, a uniform and long-lasting black dyeing effect can be achieved. The application of this dye in the textile industry not only improves the color brightness and fastness of products, but also meets consumers' pursuit of fashion and beauty.
Ink industry
In the ink industry, this substance is used as a coloring agent for ink due to its excellent solubility and color properties. It can be mixed with various resins, solvents, and additives to produce ink with excellent printing performance. This ink is suitable for various printing methods, such as gravure printing, relief printing, and flexographic printing. The ink produced using it has the characteristics of bright color, rapid drying, and strong adhesion, and is widely used in packaging printing, advertising, publication printing, and other fields.
In the plastic industry, Sudan Black B has a wide range of applications as a plastic coloring agent. It can be mixed with plastic resins such as polyvinyl chloride, polyethylene, and polypropylene to produce various colored plastic products through molding processes such as injection molding and extrusion. These plastic products not only have a beautiful appearance, but also have excellent weather resistance, heat resistance, and chemical stability. The application of Sudan Black B in the plastic industry not only enriches the color selection of plastic products, but also enhances their added value and market competitiveness.
Biological staining agent
In addition to the aforementioned industrial applications, Sudan Black B also plays an important role as a biological staining agent in the fields of biology and medical research. It can be used for staining bacteria and fats, as well as distinguishing paraffin and animal fats in tissue chemistry. In addition, it can also be used for staining myelin, white blood cell granules and Golgi apparatus, as well as staining lipids in cells and tissues. These staining applications help researchers better observe and analyze the structure and function of biological samples.
Optical materials: Sudan Black B also has broad application prospects in the field of optical materials. It can serve as a coloring agent for optical films, used in the manufacture of various optical components and devices. These optical components and devices have excellent transparency, heat resistance, and chemical stability, and can be used in fields such as optical instruments, communication equipment, aerospace, etc. In addition, Sudan Black B can also be used to manufacture optical components such as optical filters and polarizers to meet specific optical performance requirements. It is also used to manufacture display devices such as electronic paper.
Environmentally friendly materials: Sudan Black B, as an environmentally friendly dye, has a wide range of application prospects in the field of environmentally friendly materials. It can be mixed with various environmentally friendly resins, additives, etc. to produce coatings, inks, plastics, and other products with excellent environmental performance. These products not only have a beautiful appearance and excellent performance, but also meet environmental standards and requirements, helping to reduce environmental pollution and protect the ecological environment.
Solvent Black 3 is a diazo oil-soluble dye. Its industrial synthesis uses aniline, 1-naphthylamine, and 2,2-dimethyl-2,3-dihydro-1H-perimidine as core raw materials, and is completed through two-step diazotization-coupling, intermediate preparation, and post-treatment refining. Low temperature and acidity are controlled throughout the process to ensure product purity and yield.
I. Preparation of Key Intermediate
2,2-Dimethyl-2,3-dihydro-1H-perimidine is an essential intermediate. It is synthesized via condensation and cyclization of 1,8-diaminonaphthalene with acetone under acid catalysis. The reaction is carried out at 60–80 °C for 4–6 hours. After cooling, crystallization, filtration, and drying, a pale yellow solid is obtained with a purity of ≥98%, serving as the key coupling component for subsequent reactions.
II. First Diazotization-Coupling (Preparation of Monoazo Intermediate)
Diazotization of anilineAniline is dissolved in dilute hydrochloric acid and cooled to 0–5 °C. Sodium nitrite solution is added dropwise slowly with pH maintained below 2. The reaction proceeds for 1 hour to form benzenediazonium salt. The endpoint is detected by starch-iodide paper to avoid excess nitrous acid.
Coupling reaction1-Naphthylamine is dissolved in an ethanol-water mixed solvent, and the pH is adjusted to 4–5. The above diazonium salt solution is added dropwise, and the reaction is maintained at 0–5 °C for 2–3 hours to yield 4-phenylazo-1-naphthylamine (monoazo intermediate). The product is filtered, washed with water to remove inorganic salts, and dried for further use, with a yield of approximately 90%.
III. Second Diazotization-Coupling (Synthesis of Final Product)
Rediazotization of intermediate4-Phenylazo-1-naphthylamine is dissolved in a glacial acetic acid-hydrochloric acid mixture. Sodium nitrite solution is added dropwise at 0–5 °C, and the reaction lasts 1.5 hours to prepare the diazonium salt of the diazo precursor. The entire process is protected from light to prevent decomposition.
Final coupling reaction2,2-Dimethyl-2,3-dihydro-1H-perimidine is dissolved in DMF or pyridine, and the solution is adjusted to weakly alkaline. The diazonium salt solution is added dropwise, and the reaction is conducted at 0–10 °C for 3–4 hours to form 2,3-dihydro-2,2-dimethyl-6-[[4-(phenylazo)-1-naphthyl]azo]perimidine, with the reaction mixture turning blue-black.
IV. Post-Treatment and Refining
Upon completion of the reaction, dilute acid is added to induce crystallization, and the crude product is collected by filtration. It is washed with hot water and recrystallized from ethanol/toluene to remove unreacted starting materials and byproducts (including about 40% isomeric impurities). After vacuum drying at 80–100 °C, a blue-black powder is obtained with a purity of ≥98%, meeting application standards for plastics, inks, biological staining, and other fields.
Solvent Black 3 is a diazo-type oil-soluble black dye commonly used in plastics, printing inks, and biological staining. Its analysis mainly focuses on content determination, purity inspection, structural identification, and physicochemical index control, with chromatography and spectroscopy as the mainstream methods, supplemented by routine physical and chemical analyses.
I. High-Performance Liquid Chromatography (HPLC)
HPLC is the primary method for content and purity testing of this dye. A C18 reversed-phase column is typically used, with acetonitrile–water or methanol–water as the mobile phase; formic acid or buffer salts may be added appropriately to improve peak shape. A detection wavelength of 580–620 nm is often selected, as this range corresponds to the characteristic absorption peak of the product.
The main component content is calculated by the external standard method or area normalization method, which can effectively separate unreacted starting materials, isomers, and by-products. This method features high sensitivity and good repeatability, meeting the quality control requirement of ≥98% purity for industrial-grade products, and is also a standard method commonly used in import and export inspection.
II. UV-Vis Spectrophotometry
Qualitative and quantitative analysis is performed based on the characteristic absorption generated by its highly conjugated structure. The sample is dissolved in organic solvents such as toluene, ethanol, or chloroform, and the absorption curve is scanned in the range of 550–650 nm. Its maximum absorption wavelength is approximately 595 nm, which can be used for rapid qualitative identification. The absorbance shows a good linear relationship with concentration within a certain range, making it suitable for rapid quantitative screening of the product in stock solutions, color pastes, and printing inks. It is easy to operate, low-cost, and suitable for batch sample testing.
III. Fourier Transform Infrared Spectroscopy (FTIR)
It is mainly used for structural identification and authenticity verification. The infrared spectrum is measured by the potassium bromide pellet method or film method. The sample exhibits characteristic absorption peaks of the azo group (-N=N-) at 1500–1600 cm⁻¹, along with typical absorptions in the aromatic ring and alkyl regions.
IV. Other Auxiliary Analytical Items
For comprehensive quality control, tests such as melting point, volatile matter, residue on ignition, heavy metals, and solvent solubility are routinely performed. The melting point is generally 120–124 °C, which can preliminarily indicate purity; moisture content is determined by the Karl Fischer method to control water levels; residue on ignition is used to detect inorganic impurities. For reagent-grade products used in biological staining, additional safety index tests for heavy metals and arsenic are required to ensure compliance with application requirements.
FAQ
What is solvent black?
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Solvent black 5 (Spirit nigrosine) is a synthetic dye belonging to the family of azo dyes. Also known as oil black or naphthol black, it is dark blue-black and has excellent solubility in organic solvents.
What are the three types of solvents?
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Solvents are primarily classified by their polarity and ability to hydrogen bond, with the three main types being polar protic, polar aprotic, and nonpolar solvents. These types dictate how they dissolve solutes based on charge separation and hydrogen bonding capacity.
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