cas 55281-26-0, 3-[[4-[(2,6-dibromo-4-nitrophenyl)azo]phenyl]ethylamino]propiononitrile

Articles about 55281-26-0Total 6 be found

Clean synthesis of disperse azo dyes based on peculiar stable 2,6-dibromo-4-nitrophenyl diazonium sulfate
The development of clean synthetic technology of disperse azo dyes is essential for the dye industry due to ecological and economical demands. In this study, a clean, safe, and low-energy-consumption method for preparing disperse azo dyes based on 2,6-dibromo-4-nitroaniline is presented with excellent yield and short reaction time. The peculiar stable diazonium sulfate of 2,6-dibromo-4-nitroaniline is precipitated from the organic reaction system, and the solid diazonium salt is directly used to synthesize disperse azo dyes. Compared with traditional method, the amount of sulfuric acid used is reduced by 80%, the amount of waste inorganic salt is reduced by 80.9% and the heat released from the reaction system is reduced by 88.5% in the proposed method. The dye structures are verified by 1H NMR, 13C NMR, Fourier transform infrared spectroscopy (FT-IR), and high resolution mass spectrometry (HR-MS). Compared with commercial dyes, the prepared dyes have the same dyeing properties that are sufficient for industrial applications.
Qiu, Jinjing,Tang, Bingtao,Ju, Benzhi,Zhang, Shufen,Jin, Xin
(2019/09/30)

Disperse dye composition and preparation method and application thereof
The invention discloses a disperse dye composition as well as a preparation method and an application thereof. The disperse dye composition comprises a component A consisting of one or more of compounds shown by formula (1), a component B consisting of one or more compounds shown by formula (2), forbidden aromatic amine compound, chlorinated phenol, chlorobenzene, chlorotoluene, optional accessory and other unavoidable impurities, wherein the total content of the forbidden aromatic amine compound is below 10ppm, the total content of chlorinated phenol of each kind is below 0.5ppm, and the total content of chlorobenzene and chlorotoluene is below 1ppm. The environmental protection indexes of the disperse dye composition meet the requirements of Oeko-Tex Standard 100 (2016); and the properties such as washing fastness after dyeing are excellent. Moreover, by adopting the disperse dyeing composition disclosed by the invention for dyeing, the dyed fabric meets the baby-level requirements of Oeko-Tex Standard 100 (2016).
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Paragraph 0098-0101

(2019/12/15)

Diazotization method of wet nitroaniline
The invention provides a diazotization method of wet nitroaniline, and relates to the field of dye synthesis. The diazotization method comprises following steps: step one, evenly stirring sulfuric acid (98%) and nitrosyl sulfuric acid (40%) in a diazotization reactor; and step two, adding wet nitroaniline into the diazotization reactor at a controlled temperature of -10 to 40 DEG C to obtain diazotization salts, wherein the mole ratio of sulfuric acid to nitrosyl sulfuric acid to diazotization component is 1.0-6: 1.02-1.1: 1. The quality of the provided wet dye is the same as that of a dry product, the diazotization component does not need to be dried, and the provided dye is energy saving and environmentally friendly.
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Paragraph 0016-0019

(2019/01/05)

Disperse dye composition, and preparation method and application thereof
Disclosed are a disperse dye composition, and a preparation method and application thereof. The disperse dye composition comprises a component A composed of one or more of compounds shown as a formula (1) (please see the specifications for the formula), a component B composed of one or more of compounds shown as a formula (2) (please see the specifications for the formula), forbidden aromatic amine compounds, chlorinated phenols, chlorobenzene and chlorotoluene, optional auxiliaries, and other unavoidable impurities. The total content of the forbidden aromatic amine compounds is 10 ppm or below, the respective content of the various chlorinated phenols is 0.5 ppm or below, and the total content of the chlorobenzene and chlorotoluene is 1 ppm or below. The various environment protection indexes of the disperse dye composition meet the requirements of Oeko-Tex Standard 100(2016). In addition, after fabric is dyed through the disperse dye composition, the dyed fabric meets the baby level requirements of Oeko-Tex Standard 100(2016).
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Paragraph 0112-0114; 0117

(2017/08/28)

Stable diazonium salts of weakly basic amines—Convenient reagents for synthesis of disperse azo dyes
A new synthetic strategy for industrially important deep-shade disperse azo dyes was presented in this study. The key procedure is to prepare stable solid diazonium salts of weakly basic amines in the absence of concentrated sulfuric acid. Diazotization by tert-butyl nitrite in ethyl acetate was allowed to proceed in the presence of equivalent 1,5-naphthalenedisulfonic acid as stabilizer of diazonium salts and donor of hydrogen ion for the reaction. The separated solid diazonium salts exhibited good thermal stability. The corresponding disperse azo dyes were subsequently synthesized through the azo-coupling of the prepared solid diazonium salts with a range of aromatic tertiary amines. The azo dyes were produced in short reaction time, excellent yields, mild reaction conditions, simple experimental procedure and low energy consumption.
Qiu, Jinjing,Tang, Bingtao,Ju, Benzhi,Xu, Yuanji,Zhang, Shufen
p. 63 - 69
(2016/08/24)

Disperse dye composition and preparation method and application thereof
The invention relates to a disperse dye composition and a preparation method and application thereof. The disperse dye composition comprises a component A as shown in formula (1), a forbidden aromatic amine compound, chlorinated phenol, chlorobenzene, chlorotoluene, any auxiliary materials and other unavoidable impurities. According to the disperse dye composition, the total content of the forbidden aromatic amine compound is 10ppm or lower, the total content of each chlorinated phenol is 0.5ppm or lower, and the total content of chlorobenzene and chlorotoluene (COCs) is 1ppm or lower. Various environment-protective indexes of the disperse dye composition conform to the requirement of Oeko-Tex Standard 100 (2016), and various performance such as the fold strength, sublimation fastness and the like is excellent. Furthermore, after the disperse dye composition of the invention is used for dyeing a fabric, the dyed fabric conforms to the requirements of a baby level of the Oeko-Tex Standard 100 (2016). (Shown in the description).
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Paragraph 0102; 0103; 0104; 0105

(2017/07/20)