CN110041731B - Red brown dye for leather and preparation method thereof - Google Patents
Red brown dye for leather and preparation method thereof Download PDFInfo
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- CN110041731B CN110041731B CN201810040279.4A CN201810040279A CN110041731B CN 110041731 B CN110041731 B CN 110041731B CN 201810040279 A CN201810040279 A CN 201810040279A CN 110041731 B CN110041731 B CN 110041731B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B69/00—Dyes not provided for by a single group of this subclass
- C09B69/10—Polymeric dyes; Reaction products of dyes with monomers or with macromolecular compounds
- C09B69/106—Polymeric dyes; Reaction products of dyes with monomers or with macromolecular compounds containing an azo dye
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/02—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using azo dyes
- D06P1/04—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using azo dyes not containing metal
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
- D06P3/02—Material containing basic nitrogen
- D06P3/04—Material containing basic nitrogen containing amide groups
- D06P3/32—Material containing basic nitrogen containing amide groups leather skins
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Coloring (AREA)
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Abstract
The invention relates to a red brown dye for leather and a preparation method thereof, belonging to the field of direct dyes. The red brown dye for leather comprises the following raw materials in parts by weight: 280-320 parts of sodium dianthrancenate, 160-200 parts of sodium nitrite, 500-520 parts of hydrochloric acid, 210-236 parts of 4, 4' -diaminostilbene-disulfonic acid, 13-27 parts of sodium acetate, 70-90 parts of water, 12-24 parts of bisphenol-A polyoxyethylene ether and 12-24 parts of 2- [2- [ bis (2, 6-dimethylphenyl) methoxy ] ethoxy ] -N, N-dimethylethylamine. The leather surface color colored by the red brown dye is bright, the light fastness, the water resistance and the dry and wet friction resistance of the red brown dye layer on the leather surface are greatly improved, and the problems of poor coloring effect and poor fastness of leather products are solved.
Description
Technical Field
The invention relates to the field of direct dyes, in particular to a red brown dye for leather and a preparation method thereof.
Background
Colored substances that are soluble in water and solvents and have a certain fastness are called dyes. Among them, a dye for dyeing protein fibers of leather is referred to as a leather dye. In addition to the requirement for bright colors, dyes for leather are required to have good substantivity and fastness properties, such as light fastness, water resistance, dry and wet rub-off resistance, etc., after coloring.
Currently, leather dyes commonly used are classified into two major classes, acid dyes and direct dyes. The acid dye is an anionic dye, and in the process of using the acid dye, leather to be dyed is required to be placed in an acid water bath for pretreatment, so that subsequent coloring work can be carried out. Therefore, the medium with stronger acidity can damage the fiber of the leather, greatly shorten the service life of the leather and influence the quality of the leather.
The direct dye is used for coloring the surface of the leather in a direct coating mode, so that the corrosion of strong acid to the fibers on the surface of the leather is reduced. However, the direct dyes have large molecular mass and slow penetration, such as direct yellow, direct red brown, direct yellow brown, direct red, direct lake blue and the like. The leather surface has a large amount of protein fiber, and its surface unevenness, leather is at the in-process of coloring, and direct dyestuff is difficult to permeate to the tiny texture on leather surface, leads to coloring the effect poor, and the light fastness, the water proofness of the dyestuff after coloring, resistant wet and dry rubbing nature all are relatively poor.
Disclosure of Invention
The invention aims to provide a red brown dye for leather and a preparation method thereof, wherein the surface of the leather colored by the red brown dye is bright, and the light fastness, the water resistance and the dry and wet rubbing resistance of a red brown dye layer on the surface of the leather are greatly improved.
The above object of the present invention is achieved by the following technical solutions: the red brown dye for leather comprises the following raw materials in parts by weight: 280-320 parts of sodium dianthrancenate, 160-200 parts of sodium nitrite, 500-520 parts of hydrochloric acid, 210-236 parts of 4, 4' -diaminostilbene-disulfonic acid, 13-27 parts of sodium acetate, 70-90 parts of water, 12-24 parts of bisphenol-A polyoxyethylene ether and 12-24 parts of 2- [2- [ bis (2, 6-dimethylphenyl) methoxy ] ethoxy ] -N, N-dimethylethylamine.
Preferably, the mass ratio of the bisphenol-A polyoxyethylene ether to the 2- [2- [ bis (2, 6-dimethylphenyl) methoxy ] ethoxy ] -N, N-dimethylethylamine is 1: 1-2.
Preferably, the mass ratio of the bisphenol-A polyoxyethylene ether to the 2- [2- [ bis (2, 6-dimethylphenyl) methoxy ] ethoxy ] -N, N-dimethylethylamine is 1: 2.
Preferably, the concentration of the hydrochloric acid is 2.4-2.8 g/L.
The invention also aims to provide a preparation method of the red brown dye for leather.
The above object of the present invention is achieved by the following technical solutions: a preparation method of a red brown dye for leather comprises the following steps:
s1: taking 4, 4' -diaminostilbene-disulfonic acid, water and hydrochloric acid, raising the temperature of a reaction system to 50-60 ℃, uniformly stirring for 1-1.4 h, reducing the temperature of the reaction system to 20-24 ℃, adding sodium nitrite, and continuously stirring for 30-40 min;
s2: taking sodium dianthrancenate, water and sodium acetate, raising the temperature of a reaction system to 21-24 ℃, uniformly stirring for 1-1.6 h, adding sodium nitrite, and continuously stirring for 30-40 min;
s3: reducing the temperature of a reaction system to 15-17 ℃, slowly dropwise adding the mixed solution obtained in the step S1 into the mixed solution obtained in the step S2, continuously and uniformly stirring for 1-1.4 h, adding bisphenol-A polyoxyethylene ether and 2- [2- [ bis (2, 6-dimethylphenyl) methoxy ] ethoxy ] -N, N-dimethylethylamine, continuously stirring for 30-40 min, and adjusting the solution to be alkaline to prepare the red brown dye solution for leather;
s4: and drying the leather by using the red brown dye solution, and crushing the dried dye to prepare the red brown dye for the leather.
Preferably, in the step S3, the pH of the solution is 7.5 to 8.
Preferably, the time for dropping the mixed solution obtained in step S1 is 20 to 30 min.
Preferably, in the step S3, the ph of the mixed solution is adjusted by using a sodium hydroxide solution, wherein the concentration of the sodium hydroxide solution is 1.5 to 3.3 g/L.
Preferably, the mass ratio of the water in the step S1 to the water in the step 2 is 1: 1.
Preferably, the mass ratio of the sodium nitrite in the step S1 to the step 2 is 3: 1.
In conclusion, the invention has the following beneficial effects:
1. the red-brown dye for leather prepared by the invention has good use performance, the surface color of the leather colored by the red-brown dye for leather is bright, and the light fastness, the water resistance and the dry-wet friction resistance of the red-brown dye layer on the surface of the leather are improved by more than 20%.
2. In the process of preparing the reddish brown dye for leather, bisphenol-A polyoxyethylene ether and 2- [2- [ bis (2, 6-dimethylphenyl) methoxy ] ethoxy ] -N, N-dimethylethylamine are grafted on C ═ C and N ═ N of the dye, and meanwhile, more hydrophilic groups are grafted on macromolecules of the dye by adjusting reaction conditions. In the process of using the reddish brown dye for leather, the hydrophilic groups in the bisphenol-A polyoxyethylene ether and the 2- [2- [ bis (2, 6-dimethylphenyl) methoxy ] ethoxy ] -N, N-dimethylethylamine are quickly adsorbed on the surface of the leather, so that dye macromolecules are quickly filled in fine textures of the leather, the permeability of the dye is improved, a reddish brown dye layer formed on the surface of the leather is uniform and compact, and the light fastness, the water resistance and the dry-wet friction resistance of the reddish brown dye layer are greatly improved.
Detailed Description
All materials referred to in the examples of the present invention are commercially available.
First, the manufacturing embodiment
Example 1
S1: taking 223kg of 4, 4' -diaminostilbene-disulfonic acid, 40kg of water and 510kg of hydrochloric acid, wherein the concentration of the hydrochloric acid is 2.6g/L, raising the temperature of a reaction system to 55 ℃, uniformly stirring for 1.2h, reducing the temperature of the reaction system to 22 ℃, adding 135kg of sodium nitrite, and continuously stirring for 35 min;
s2: taking 300kg of sodium dianthrancenate, 40kg of water and 20kg of sodium acetate, raising the temperature of a reaction system to 22.5 ℃, uniformly stirring for 1.3h, adding 45kg of sodium nitrite, and continuously stirring for 35 min;
s3: reducing the temperature of a reaction system to 16 ℃, slowly dropwise adding the mixed solution obtained by S1 into the mixed solution obtained by S2, wherein the dropwise adding time is 25min, continuously and uniformly stirring for 1.2h after the dropwise adding is finished, then adding 12kg of bisphenol-A polyoxyethylene ether and 24kg of 2- [2- [ bis (2, 6-dimethylphenyl) methoxy ] ethoxy ] -N, N-dimethylethylamine, continuously stirring for 35min, and then adjusting the pH of the solution to 8 by using a sodium hydroxide solution to prepare a red brown dye solution for leather, wherein the concentration of the sodium hydroxide is 2.4 g/L;
s4: and drying the leather by using the red brown dye solution, and crushing the dried dye to prepare the red brown dye for the leather.
Example 2
S1: taking 210kg of 4, 4' -diaminostilbene-disulfonic acid, 35kg of water and 500kg of hydrochloric acid, wherein the concentration of the hydrochloric acid is 2.8g/L, raising the temperature of a reaction system to 60 ℃, uniformly stirring for 1h, reducing the temperature of the reaction system to 22 ℃, adding 150kg of sodium nitrite, and continuously stirring for 30 min;
s2: taking 280kg of sodium dianthrancenate, 35kg of water and 13kg of sodium acetate, raising the temperature of a reaction system to 24 ℃, uniformly stirring for 1.6h, adding 40kg of sodium nitrite, and continuously stirring for 35 min;
s3: reducing the temperature of a reaction system to 17 ℃, slowly dropwise adding the mixed solution obtained by S1 into the mixed solution obtained by S2, wherein the dropwise adding time is 20min, continuously and uniformly stirring for 1h after the dropwise adding is finished, then adding 18kg of bisphenol-A polyoxyethylene ether and 18kg of 2- [2- [ bis (2, 6-dimethylphenyl) methoxy ] ethoxy ] -N, N-dimethylethylamine, continuously stirring for 40min, and then adjusting the pH of the solution to 8 by using a sodium hydroxide solution to prepare a red brown dye solution for leather, wherein the concentration of sodium hydroxide is 1.5 g/L;
s4: and drying the leather by using the red brown dye solution, and crushing the dried dye to prepare the red brown dye for the leather.
Example 3
S1: taking 236kg of 4, 4' -diaminostilbene-disulfonic acid, 35kg of water and 500kg of hydrochloric acid, wherein the concentration of the hydrochloric acid is 2.8g/L, raising the temperature of a reaction system to 50 ℃, uniformly stirring for 1.4h, reducing the temperature of the reaction system to 24 ℃, adding 150kg of sodium nitrite, and continuously stirring for 30 min;
s2: taking 320kg of sodium dianthrancenate, 35kg of water and 13kg of sodium acetate, raising the temperature of a reaction system to 24 ℃, uniformly stirring for 1h, adding 50kg of sodium nitrite, and continuously stirring for 40 min;
s3: reducing the temperature of a reaction system to 17 ℃, slowly dropwise adding the mixed solution obtained by S1 into the mixed solution obtained by S2, wherein the dropwise adding time is 20min, continuously and uniformly stirring for 1.4h after the dropwise adding is finished, then adding 12kg of bisphenol-A polyoxyethylene ether and 12kg of 2- [2- [ bis (2, 6-dimethylphenyl) methoxy ] ethoxy ] -N, N-dimethylethylamine, continuously stirring for 40min, and then regulating the pH of the solution to 7.5 by using a sodium hydroxide solution to prepare a reddish brown dye solution for leather, wherein the concentration of sodium hydroxide is 3.3 g/L;
s4: and drying the leather by using the red brown dye solution, and crushing the dried dye to prepare the red brown dye for the leather.
Example 4
S1: taking 210kg of 4, 4' -diaminostilbene-disulfonic acid, 35kg of water and 520kg of hydrochloric acid, wherein the concentration of the hydrochloric acid is 2.4g/L, raising the temperature of a reaction system to 60 ℃, uniformly stirring for 1.2h, reducing the temperature of the reaction system to 20 ℃, adding 135kg of sodium nitrite, and continuously stirring for 40 min;
s2: taking 280kg of sodium dianthrancenate, 35kg of water and 27kg of sodium acetate, raising the temperature of a reaction system to 21 ℃, uniformly stirring for 1.6h, adding 45kg of sodium nitrite, and continuously stirring for 30 min;
s3: reducing the temperature of a reaction system to 16 ℃, slowly dropwise adding the mixed solution obtained by S1 into the mixed solution obtained by S2, wherein the dropwise adding time is 30min, continuously and uniformly stirring for 1h after the dropwise adding is finished, then adding 12kg of bisphenol-A polyoxyethylene ether and 24kg of 2- [2- [ bis (2, 6-dimethylphenyl) methoxy ] ethoxy ] -N, N-dimethylethylamine, continuously stirring for 30min, and then adjusting the pH of the solution to 8 by using a sodium hydroxide solution to prepare the red brown dye solution for leather, wherein the concentration of the sodium hydroxide is 2.4 g/L;
s4: and drying the leather by using the red brown dye solution, and crushing the dried dye to prepare the red brown dye for the leather.
Example 5
S1: taking 236kg of 4, 4' -diaminostilbene-disulfonic acid, 45kg of water and 520kg of hydrochloric acid, wherein the concentration of the hydrochloric acid is 2.4g/L, raising the temperature of a reaction system to 50 ℃, uniformly stirring for 1h, reducing the temperature of the reaction system to 22 ℃, adding 135kg of sodium nitrite, and continuously stirring for 40 min;
s2: taking 320kg of sodium dianthrancenate, 45kg of water and 27kg of sodium acetate, raising the temperature of a reaction system to 21 ℃, uniformly stirring for 1h, adding 40kg of sodium nitrite, and continuously stirring for 35 min;
s3: reducing the temperature of a reaction system to 16 ℃, slowly dropwise adding the mixed solution obtained by S1 into the mixed solution obtained by S2, wherein the dropwise adding time is 30min, continuously and uniformly stirring for 1.4h after the dropwise adding is finished, then adding 24kg of bisphenol-A polyoxyethylene ether and 24kg of 2- [2- [ bis (2, 6-dimethylphenyl) methoxy ] ethoxy ] -N, N-dimethylethylamine, continuously stirring for 30min, and then adjusting the pH of the solution to 7.5 by using a sodium hydroxide solution to prepare a red brown dye solution for leather, wherein the concentration of sodium hydroxide is 1.5 g/L;
s4: and drying the leather by using the red brown dye solution, and crushing the dried dye to prepare the red brown dye for the leather.
Example 6
S1: taking 210kg of 4, 4' -diaminostilbene-disulfonic acid, 45kg of water and 500kg of hydrochloric acid, wherein the concentration of the hydrochloric acid is 2.4g/L, raising the temperature of a reaction system to 60 ℃, uniformly stirring for 1.4h, reducing the temperature of the reaction system to 24 ℃, adding 120kg of sodium nitrite, and continuously stirring for 40 min;
s2: taking 280kg of sodium dianthrancenate, 45kg of water and 13kg of sodium acetate, raising the temperature of a reaction system to 21 ℃, uniformly stirring for 1.6h, adding 50kg of sodium nitrite, and continuously stirring for 40 min;
s3: reducing the temperature of a reaction system to 15 ℃, slowly dropwise adding the mixed solution obtained by S1 into the mixed solution obtained by S2, wherein the dropwise adding time is 30min, continuously and uniformly stirring for 1h after the dropwise adding is finished, then adding 24kg of bisphenol-A polyoxyethylene ether and 12kg of 2- [2- [ bis (2, 6-dimethylphenyl) methoxy ] ethoxy ] -N, N-dimethylethylamine, continuously stirring for 30min, and then adjusting the pH of the solution to 8 by using a sodium hydroxide solution to prepare the red brown dye solution for leather, wherein the concentration of the sodium hydroxide is 3.3 g/L;
s4: and drying the leather by using the red brown dye solution, and crushing the dried dye to prepare the red brown dye for the leather.
Second, preparation of comparative example
Comparative example 1: commercially available direct red brown dyes.
Comparative example 2:
s1: taking 223kg of 4, 4' -diaminostilbene-disulfonic acid, 40kg of water and 510kg of hydrochloric acid, wherein the concentration of the hydrochloric acid is 2.6g/L, raising the temperature of a reaction system to 55 ℃, uniformly stirring for 1.2h, reducing the temperature of the reaction system to 22 ℃, adding 135kg of sodium nitrite, and continuously stirring for 35 min;
s2: taking 300kg of sodium dianthrancenate, 40kg of water and 20kg of sodium acetate, raising the temperature of a reaction system to 22.5 ℃, uniformly stirring for 1.3h, adding 45kg of sodium nitrite, and continuously stirring for 35 min;
s3: reducing the temperature of the reaction system to 16 ℃, slowly dropwise adding the mixed solution obtained in the step S1 into the mixed solution obtained in the step S2, wherein the dropwise adding time is 25min, after the dropwise adding, continuously and uniformly stirring for 1.2h, and then, adjusting the pH of the solution to 8 by using a sodium hydroxide solution to prepare a red brown dye solution for leather, wherein the concentration of the sodium hydroxide is 2.4 g/L;
s4: and drying the leather by using the red brown dye solution, and crushing the dried dye to prepare the red brown dye for the leather.
Third, the performance of the dyes of the above examples and comparative examples were tested.
10g of the dyes of the examples and comparative examples were dissolved in 100L of water, and then the leather was dyed. And (3) carrying out a fastness test on the dyed leather, and taking a standard fading card as an evaluation standard.
The evaluation index results are shown in table 1.
TABLE 1 results of performance test of dyes in examples and comparative examples
| Results of Performance testing | Leather color | Color fastness to sunlight | Dry friction | Wet friction | Water resistance |
| Example 1 | Bright and uniform color | 4 stage | 4 stage | 4 stage | 4 stage |
| Example 2 | Bright and uniform color | 4 stage | 4 stage | 4 stage | 4 stage |
| Example 3 | Bright and uniform color | 4 stage | 4 stage | 4 stage | 4 stage |
| Example 4 | Bright and uniform color | 4 stage | 4 stage | 4 stage | 4 stage |
| Example 5 | Bright and uniform color | 4 stage | 4 stage | 4 stage | 4 stage |
| Example 6 | Bright and uniform color | 4 stage | 4 stage | 4 stage | 4 stage |
| Comparative example 1 | Bright and uneven color | Stage 2 | Grade 3 | Stage 2 | Stage 2 |
| Comparative example 2 | Bright and uneven color | Grade 3 | Grade 3 | Stage 2 | Grade 3 |
The table shows that the red-brown dye for leather prepared by the invention has good service performance, the leather surface color colored by the red-brown dye for leather is bright and uniform, and the light fastness, the water resistance and the dry-wet friction resistance of the red-brown dye layer on the surface of the leather are greatly improved.
Wherein, the comparative example 1 is a commercial direct red brown dye, and the direct red brown dye has large molecular mass and slow permeation, so that the direct dye is difficult to permeate into fine textures on the surface of the leather in the coloring process of the leather, thereby causing poor coloring effect, and the dye after coloring has poor light fastness, water resistance and dry and wet friction resistance.
In comparative example 2, bisphenol-A polyoxyethylene ether and 2- [2- [ bis (2, 6-dimethylphenyl) methoxy ] ethoxy ] -N, N-dimethylethylamine were not added, and no hydrophilic grafting was carried out in the dye molecular chain during the preparation of the reddish brown dye for leather. In the process of using the reddish brown dye for leather, the dye can not be quickly adsorbed on the surface of the leather, so that dye macromolecules can not be quickly filled in fine textures of the leather, a reddish brown dye layer formed on the surface of the leather is uneven and compact, and the light fastness, the water resistance and the dry-wet friction resistance of the reddish brown dye layer are reduced.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. The red brown dye for leather is characterized by comprising the following raw materials in parts by weight: 280-320 parts of sodium dianthrancenate, 160-200 parts of sodium nitrite, 500-520 parts of hydrochloric acid, 210-236 parts of 4, 4' -diaminostilbene-disulfonic acid, 13-27 parts of sodium acetate, 70-90 parts of water, 12-24 parts of bisphenol-A polyoxyethylene ether and 12-24 parts of 2- [2- [ bis (2, 6-dimethylphenyl) methoxy ] ethoxy ] -N, N-dimethylethylamine.
2. The reddish brown dye for leather as claimed in claim 1, wherein the mass ratio of bisphenol-A polyoxyethylene ether to 2- [2- [ bis (2, 6-dimethylphenyl) methoxy ] ethoxy ] -N, N-dimethylethylamine is 1: 1-2.
3. The reddish brown dye for leather as claimed in claim 2, wherein the mass ratio of bisphenol-A polyoxyethylene ether to 2- [2- [ bis (2, 6-dimethylphenyl) methoxy ] ethoxy ] -N, N-dimethylethylamine is 1: 2.
4. The red brown dye for leather as claimed in claim 1, wherein the concentration of the hydrochloric acid is 2.4-2.8 g/L.
5. A process for preparing the red brown dye for leather according to claim 1, comprising the steps of:
s1: taking 4, 4' -diaminostilbene-disulfonic acid, water and hydrochloric acid, raising the temperature of a reaction system to 50-60 ℃, uniformly stirring for 1-1.4 h, reducing the temperature of the reaction system to 20-24 ℃, adding sodium nitrite, and continuously stirring for 30-40 min;
s2: taking sodium dianthrancenate, water and sodium acetate, raising the temperature of a reaction system to 21-24 ℃, uniformly stirring for 1-1.6 h, adding sodium nitrite, and continuously stirring for 30-40 min;
s3: reducing the temperature of a reaction system to 15-17 ℃, slowly dropwise adding the mixed solution obtained in the step S1 into the mixed solution obtained in the step S2, continuously and uniformly stirring for 1-1.4 h, adding bisphenol-A polyoxyethylene ether and 2- [2- [ bis (2, 6-dimethylphenyl) methoxy ] ethoxy ] -N, N-dimethylethylamine, continuously stirring for 30-40 min, and adjusting the solution to be alkaline to prepare the red brown dye solution for leather;
s4: and drying the leather by using the red brown dye solution, and crushing the dried dye to prepare the red brown dye for the leather.
6. The method for preparing the reddish brown dye for leather according to claim 5, wherein in the step S3, the pH value of the solution is 7.5-8.
7. The method for preparing the reddish brown dye for leather according to claim 5, wherein the time for dripping the mixed solution obtained in the step S1 is 20-30 min.
8. The method for preparing the reddish brown dye for leather according to claim 5, wherein in the step S3, the pH value of the mixed solution is adjusted by using a sodium hydroxide solution, and the concentration of the sodium hydroxide solution is 1.5-3.3 g/L.
9. The method for preparing the red brown dye for leather according to claim 5, wherein the mass ratio of the water in the step S1 to the water in the step 2 is 1: 1.
10. The method for preparing the reddish brown dye for leather according to claim 5, wherein the mass ratio of the sodium nitrite in the step S1 to the step 2 is 3: 1.
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| CN110041731B true CN110041731B (en) | 2020-09-18 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5360472A (en) * | 1992-12-17 | 1994-11-01 | Xerox Corporation | Waterfast dye compositions |
| US5431723A (en) * | 1992-08-20 | 1995-07-11 | Basf Aktiengesellschaft | Use of liquid preparations of a disazo dye in the ink jet process and the diazo dye |
| JP2007291246A (en) * | 2006-04-25 | 2007-11-08 | Mitsubishi Chemicals Corp | Azo dye, composition for anisotropic dye film having the dye, anisotropic dye film, and polarizing element |
| CN105647234A (en) * | 2014-11-13 | 2016-06-08 | 赵建英 | Leather composite red-brown dye synthesis process |
-
2018
- 2018-01-16 CN CN201810040279.4A patent/CN110041731B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5431723A (en) * | 1992-08-20 | 1995-07-11 | Basf Aktiengesellschaft | Use of liquid preparations of a disazo dye in the ink jet process and the diazo dye |
| US5360472A (en) * | 1992-12-17 | 1994-11-01 | Xerox Corporation | Waterfast dye compositions |
| JP2007291246A (en) * | 2006-04-25 | 2007-11-08 | Mitsubishi Chemicals Corp | Azo dye, composition for anisotropic dye film having the dye, anisotropic dye film, and polarizing element |
| CN105647234A (en) * | 2014-11-13 | 2016-06-08 | 赵建英 | Leather composite red-brown dye synthesis process |
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