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Synthesis process of yellow dye of leather

A synthetic process, the technology of yellow dyes, applied in the field of synthetic process of dyes, can solve the problems of large migration, poor color fastness, etc., and achieve the effect of light chroma, high dyeing rate and saving money

Inactive Publication Date: 2010-02-10
HENAN CHENGTAI CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a leather yellow dye synthesis process to solve the defects of poor color fastness and large migration of yellow dye produced by traditional technology in leather dyeing, and to solve the current international and domestic technical problems urgently to be solved

Method used

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  • Synthesis process of yellow dye of leather

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Experimental program
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Effect test

Embodiment 1

[0019] According to the following molar ratio: 4.4'-diaminobenzenesulfonanilide: HCl: NaNO 2 : salicylic acid: pyrazolone = 1: 5.6: 2.2: 1: 0.98, mix 4.4'-diaminobenzenesulfonanilide, hydrochloric acid, and sodium nitrite at a temperature T≤12°C, 0.5≤PH≤ Under the conditions of 2.5, the reaction time is 0.5-2.5 hours for diazotization; then add salicylic acid, and under the conditions of temperature 3-16 ° C, 6≤PH≤10, the reaction time is 2-4.5 hours for a coupling; add Pyrazolone, under the conditions of temperature 8-22°C, 8≤PH≤11, reaction time 2-5 hours for secondary coupling; after secondary coupling, add bis-quaternary ammonium salt and mix; mix and dry to produce finished product .

Embodiment 2

[0021] According to the following molar ratio: 4.4'-diaminobenzenesulfonanilide: HCl: NaNO 2 : salicylic acid: pyrazolone = 1: 5.6: 2.2: 1: 0.98, mix 4.4'-diaminobenzenesulfonanilide, hydrochloric acid, and sodium nitrite at a temperature of 5-10°C, 0.8≤ Under the condition of PH≤2.2, the reaction time is 1-2 hours for diazotization; then add salicylic acid, and under the condition of temperature 5-15℃, 8.5≤PH≤9.5, the reaction time is 2.5-4 hours for a coupling ; add pyrazolone, under the conditions of temperature 10-20 ℃, 8.5≤PH≤10, reaction time 3-4.5 hours for secondary coupling; after secondary coupling, add double quaternary ammonium salt and mix; mix and dry to produce Finished product.

Embodiment 3

[0023] According to the following molar ratio: 4.4'-diaminobenzenesulfonanilide: HCl: NaNO 2 : salicylic acid: pyrazolone = 1: 5.6: 2.2: 1: 0.98, mix 4.4'-diaminobenzenesulfonanilide, hydrochloric acid, and sodium nitrite at a temperature of 8-12°C, 1≤ Under the condition of PH≤2.5, the reaction time is 1-1.5 hours for diazotization; then add salicylic acid, and under the condition of temperature 8-12℃, 8.2≤PH≤9.8, the reaction time is 2-4.5 hours for a coupling ; add pyrazolone, under the condition of temperature 15-20 ℃, 8.2≤PH≤9.6, the reaction time is 3.5-4.5 hours for secondary coupling; after secondary coupling, add double quaternary ammonium salt and mix; mix and dry to produce Finished product.

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Abstract

The invention relates to a synthesis process of yellow dye of leather. The synthesis process comprises the following steps: proportioning; diazotizing; once coupling; twice coupling; mixing; and drying to produce a finished product; in detail, (1) screening a midbody which is primarily an environmental-friendly midbody without 24 carcinogenic aromatic amines; (2) enabling the midbody to have a corresponding molecular structure for synthesizing yellow dye; and (3) researching a reasonable synthesis process. Proved by repeated tests, the synthesis process is suitable for the needs of industrialized production.

Description

technical field [0001] The invention relates to a dye synthesis process, in particular to a leather yellow dye synthesis process. Background technique [0002] At present, the amount of dyes in the yellow spectrum is increasing year by year in modern leather dyeing, accounting for about 25% of leather dyes. In addition to being directly used to dye wet blue leather yellow, yellow leather dyes are mainly used to adjust the color or color matching of other shades of leather dyes. Traditional leather yellow dyes have been using dyes such as acid yellow (bright yellow) or weak acid (bright yellow). These dyes are generally monoazo dyes with relatively high molecular weight. They have the advantages of good permeability and high dyeing rate in leather dyeing, but Due to the small molecular weight, dyed leather has the disadvantages of poor color fastness and large migration, which seriously hinders the improvement of the quality of leather products. Contents of the invention ...

Claims

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Application Information

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IPC IPC(8): C09B35/04D06P1/02D06P3/32
Inventor 陈子厚朱振汉
Owner HENAN CHENGTAI CHEM TECH
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