Method for improving color depth of dyed fabric by using alumina sol

Abstract

The invention belongs to the technical field of textiles, and particularly discloses a method for improving the color depth of a dyed fabric by using alumina sol. The method comprises the following steps: preparing an aluminum nitrate or aluminum sulfate solution, adjusting the pH value of the solution with ammonia water under stirring until a large amount of precipitate appears in the solution, centrifuging, and washing the precipitate with deionized water until the precipitate is neutral; dispersing the obtained precipitate in deionized water, and adjusting the pH value with nitric acid to obtain alumina sol; soaking the fabric in the aluminum sol at room temperature for a period of time, washing and drying; preparing a dye solution, soaking the soaked fabric into the dye solution, dyeing, taking out, washing and drying to obtain the dyed fabric. According to the method, the aluminum sol is adopted to replace a traditional mordant, and an excellent deepening effect is obtained under the condition of low aluminum ion concentration.

Description

Technical Field

[0001] The invention belongs to the technical field of textiles and specifically discloses a method for improving the color depth of dyed fabrics by utilizing aluminum sol. Background Art

[0002] Mordant dyeing is a dyeing technique that uses mordants to improve the dye uptake and fixation fastness of dyes on fibers. It is widely used in natural dyeing. The basic principle is that metal ions bridge the dye and fiber through coordination, thereby fixing the dye to the fabric. Common mordants include alum (aluminum salt), green vitriol (ferrous sulfate), chromium salts, copper salts, etc. In traditional mordant dyeing, metal mordants carry little charge, so the amount of mordant used is often large. This can cause a large amount of metal salts to enter the natural environment with wastewater discharge, polluting soil and water sources, and ultimately endangering human health.

[0003] Currently, aluminum ions are primarily used for textile mordanting. Alumina sol is a colloidal solution composed of various complex hydrated aluminum oxide cluster oligomers, formed by dissolving an aluminum source precursor in water and undergoing complex hydrolysis and polymerization reactions. The entire sol micelle is electrically neutral, but because some anions are distributed in the diffusion layer outside the micelle, the micelles of the aluminum sol carry a positive charge. Furthermore, as the pH value changes, aluminum dimers, trimers, and even polymers may appear in the aluminum sol, such as (Al(H2O)6). 3+ , (Al2(OH)2(H2O)8) 4+ ,

[0004] (Al 13 O4(OH) 24 (H2O) 12 ) 7+ 、(Al8(OH) 20 (H2O) 12 ) 4+ The aluminum sol particle size increases, and the charge count increases. Patent CN 110306366 A discloses a method for dyeing cashmere fibers using food coloring after in-situ formation of aluminum hydroxide sol on the surface of the fibers. This method first places the cashmere fibers in an aqueous sodium bicarbonate solution, then drips an aluminum salt solution to generate aluminum hydroxide sol in situ on the cashmere fibers. Because sodium bicarbonate is weakly alkaline, it poses a risk of damaging protein fibers. After the aluminum salt solution is added, acetic acid or formic acid is used to adjust the solution pH to 5-7. This partially dissolves the in-situ aluminum hydroxide sol, forming aluminum ions that fall off during the post-dyeing washing process. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a method for increasing the color depth of dyed fabrics using aluminum sol. The method uses aluminum nitrate or aluminum sulfate as a raw material, precipitates it with ammonia water, and then dissolves it with nitric acid to obtain aluminum sol, which is then used to dye textiles.

[0006] The method for increasing the color depth of dyed fabrics by using aluminum sol provided by the present invention comprises the following specific steps:

[0007] (1) Prepare a 0.2-0.8 mol / L aluminum nitrate solution or a 2 g / L aluminum sulfate solution, and adjust the pH value of the solution to 8-10 with 5 mol / L ammonia water under stirring at room temperature. A large amount of precipitate will appear in the solution, centrifuge, and wash the precipitate with deionized water until it is neutral;

[0008] (2) dispersing the precipitate obtained in step (1) in deionized water, placing the mixture in a water bath at 90° C., and adjusting the pH value to 3-6 with 5 mol / L nitric acid to obtain an aluminum sol; soaking the fabric in the aluminum sol at a bath ratio of 1:30 at room temperature for a period of time, washing the fabric with deionized water 3-5 times, and drying the fabric;

[0009] The mass ratio of the precipitate to the deionized water is 1:10-1:50, the fabric is cotton fabric or silk fabric, and the soaking time is 30 min-120 min;

[0010] (3) preparing a dye solution with a concentration of 1-3 g / L, immersing the fabric treated in step (2) in the dye solution or plant dye extract at a bath ratio of 1:30, dyeing at 60-80° C. for 30-60 min, taking out, washing with deionized water 3-5 times, and drying.

[0011] The dye is a reactive dye or a plant dye; the plant dye is selected from one of madder, chestnut shell and catechu.

[0012] The extraction method of the plant dye extract comprises the following steps: adding the plant raw material into a 50% ethanol aqueous solution at a material-liquid mass ratio of 3.5-5:100, and soaking the mixture at room temperature for 5 hours to obtain the plant dye extract.

[0013] The beneficial effects of the present invention are:

[0014] The present invention uses aluminum sol to replace traditional mordants. Aluminum sol not only has strong positive charge and good stability, but also has excellent adsorption and adhesion properties to fibers. Under conditions of relatively low aluminum ion concentration, an excellent darkening effect is achieved. During the drying process, the aluminum sol can gel on the fibers, thereby improving its bonding strength with the fibers. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1The following are photos of dyed fabrics obtained in Examples 1-14 and Comparative Examples 1-1, 3-1, 3-2, and 4-1.

[0016] Figure 2 XRD of the aluminum sol obtained in Example 3.

[0017] Figure 3 Tyndall effect diagram of the aluminum sol obtained in Example 3. DETAILED DESCRIPTION

[0018] The present invention will be described in further detail below with reference to specific examples. It should be understood that these examples are intended to illustrate the present invention and are not intended to limit the scope of the present invention in any way. The powdered chestnut shell plant dye and catechu plant dye used in the present invention are products of Changzhou Meisheng Biomaterial Co., Ltd.

[0019] Example 1

[0020] (1) Prepare 50 mL of 0.2 mol / L aluminum nitrate solution and adjust the pH of the solution to 9 with 5 mol / L ammonia water under stirring at room temperature. A large amount of precipitate will appear in the solution. Centrifuge and wash the precipitate with deionized water until it is neutral.

[0021] (2) mixing the precipitate obtained in step (1) with deionized water at a mass ratio of 1:40, placing the mixture in a water bath at 90° C., and adjusting the pH to 4 with 5 mol / L nitric acid to obtain an aluminum sol; soaking cotton fabric in the aluminum sol at a bath ratio of 1:30 at room temperature for 30 minutes, washing the mixture three times with deionized water, and drying the mixture;

[0022] (3) Prepare a 1 g / L aqueous solution of reactive dye (Kehuasu Yellow 3RS), immerse the fabric treated in step (2) in the solution at a bath ratio of 1:30, dye at 60° C. for 60 min, remove the fabric, wash it with deionized water three times, and then dry it.

[0023] Comparative Example 1-1

[0024] Prepare a 1g / L aqueous solution of reactive dye (Kehuasu Yellow 3RS), immerse cotton fabric in it with a bath ratio of 1:30. After 15 minutes, add anhydrous sodium sulfate to a concentration of 50g / L in the solution. After complete dissolution, start timing. After 15 minutes, raise the temperature to 60°C and add sodium carbonate to a concentration of 20g / L in the solution. After dyeing at 60°C for 60 minutes, take out, wash three times with deionized water, and dry.

[0025] Example 2

[0026] (1) Prepare 50 mL of 0.8 mol / L aluminum nitrate solution and adjust the pH of the solution to 9 with 5 mol / L ammonia water under stirring at room temperature. A large amount of precipitate will appear in the solution. Centrifuge and wash the precipitate with deionized water until it is neutral.

[0027] (2) mixing the precipitate obtained in step (1) with deionized water at a mass ratio of 1:10, placing the mixture in a water bath at 90° C., and adjusting the pH to 5.5 with 5 mol / L nitric acid to obtain an aluminum sol; soaking cotton fabric in the aluminum sol at a bath ratio of 1:30 at room temperature for 120 min, washing the mixture three times with deionized water, and drying the mixture;

[0028] (3) Prepare a 3 g / L aqueous solution of reactive dye (Kehuasu Yellow 3RS), immerse the fabric treated in step (2) in the solution at a bath ratio of 1:30, dye at 80° C. for 30 min, remove the fabric, wash it with deionized water 5 times, and then dry it.

[0029] Example 3

[0030] (1) Prepare 50 mL of 0.3 mol / L aluminum nitrate solution and adjust the pH of the solution to 9 with 5 mol / L ammonia water under stirring at room temperature. A large amount of precipitate will appear in the solution. Centrifuge and wash the precipitate with deionized water until it is neutral.

[0031] (2) mixing the precipitate obtained in step (1) with deionized water at a mass ratio of 1:25, placing the mixture in a water bath at 90° C., and adjusting the pH to 4 with 5 mol / L nitric acid to obtain an aluminum sol; soaking the silk fabric in the aluminum sol at a bath ratio of 1:30 at room temperature for 60 minutes, washing the mixture with deionized water three times, and drying the mixture;

[0032] (3) Adding the madder root to a 50% ethanol aqueous solution at a material-liquid mass ratio of 3.5:100, soaking at room temperature for 5 hours to obtain the madder plant dye extract, immersing the fabric treated in step (2) in the extract at a bath ratio of 1:30, dyeing at 60°C for 30 minutes, taking out, washing with deionized water 4 times, and drying.

[0033] Figure 2 This is the XRD pattern of the aluminum sol obtained in this example. As can be seen from the figure, the obtained aluminum sol is not a single aluminum hydroxide or aluminum oxide, but is composed of various aluminum ion micelles.

[0034] Comparative Example 3-1

[0035] Rubia cordifolia root was added to a 50% ethanol aqueous solution at a material-liquid mass ratio of 3.5:100, and the mixture was soaked at room temperature for 5 hours to obtain a Rubia cordifolia plant dye extract. Silk fabric was immersed in the extract at a bath ratio of 1:30 and dyed at 60°C for 30 minutes. The fabric was taken out, washed with deionized water four times, and then dried.

[0036] Comparative Example 3-2

[0037] Prepare 50 mL of 0.85 mol / L aluminum nitrate solution and soak the silk fabric in the aluminum nitrate solution at a bath ratio of 1:30 at room temperature for 30 min. Then wash it three times with deionized water and dry it.

[0038] Rubia cordifolia root was added to a 50% ethanol aqueous solution at a material-liquid mass ratio of 3.5:100, and the mixture was soaked at room temperature for 5 hours to obtain a Rubia cordifolia plant dye extract. Silk fabric was immersed in the extract at a bath ratio of 1:30 and dyed at 60°C for 30 minutes. The fabric was taken out, washed with deionized water four times, and then dried.

[0039] Example 4

[0040] (1) Prepare 50 mL of 0.4 mol / L aluminum nitrate solution and adjust the pH of the solution to 9 with 5 mol / L ammonia water under stirring at room temperature. A large amount of precipitate will appear in the solution. Centrifuge and wash the precipitate with deionized water until it is neutral.

[0041] (2) mixing the precipitate obtained in step (1) with deionized water at a mass ratio of 1:20, placing the mixture in a water bath at 90° C., and adjusting the pH to 5 with 5 mol / L nitric acid to obtain an aluminum sol; soaking the silk fabric in the aluminum sol at a bath ratio of 1:30 at room temperature for 90 minutes, washing the mixture three times with deionized water, and drying the mixture;

[0042] (3) Adding the madder root to a 50% ethanol aqueous solution at a material-liquid mass ratio of 5:100, soaking at room temperature for 5 hours to obtain the madder plant dye extract, immersing the fabric treated in step (2) in the extract at a bath ratio of 1:30, dyeing at 70°C for 45 minutes, taking out, washing with deionized water 5 times, and drying.

[0043] Example 5

[0044] (1) Prepare 50 mL of 0.6 mol / L aluminum nitrate solution and adjust the pH of the solution to 9 with 5 mol / L ammonia water under stirring at room temperature. A large amount of precipitate will appear in the solution. Centrifuge and wash the precipitate with deionized water until it is neutral.

[0045] (2) mixing the precipitate obtained in step (1) with deionized water at a mass ratio of 1:10, placing the mixture in a water bath at 90° C., and adjusting the pH to 5.5 with 5 mol / L nitric acid to obtain an aluminum sol; soaking the silk fabric in the aluminum sol at a bath ratio of 1:30 at room temperature for 120 min, washing the mixture with deionized water three times, and drying the mixture;

[0046] (3) Prepare a 2.5 g / L reactive dye (Kehuasu Yellow 3RS) solution, immerse the fabric treated in step (2) in it, with a bath ratio of 1:30, dye at 65°C for 50 minutes, take out, wash with deionized water 5 times, and dry.

[0047] Example 6

[0048] (1) Prepare 50 mL of 0.6 mol / L aluminum nitrate solution and adjust the pH of the solution to 9 with 5 mol / L ammonia water under stirring at room temperature. A large amount of precipitate will appear in the solution. Centrifuge and wash the precipitate with deionized water until it is neutral.

[0049] (2) mixing the precipitate obtained in step (1) with deionized water at a mass ratio of 1:10, placing the mixture in a water bath at 90° C., and adjusting the pH to 5.5 with 5 mol / L nitric acid to obtain an aluminum sol; soaking the silk fabric in the aluminum sol at a bath ratio of 1:30 at room temperature for 60 minutes, washing the mixture with deionized water three times, and drying the mixture;

[0050] (3) Prepare 1.5 g / L chestnut shell plant dye solution, immerse the fabric treated in step (2) in it, with a bath ratio of 1:30, dye at 60° C. for 60 minutes, take out, wash with deionized water 5 times, and dry.

[0051] Example 7

[0052] (1) Prepare 50 mL of 0.8 mol / L aluminum nitrate solution and adjust the pH of the solution to 9 with 5 mol / L ammonia water under stirring at room temperature. A large amount of precipitate will appear in the solution. Centrifuge and wash the precipitate with deionized water until it is neutral.

[0053] (2) mixing the precipitate obtained in step (1) with deionized water at a mass ratio of 1:10, placing the mixture in a water bath at 90° C., and adjusting the pH to 5.5 with 5 mol / L nitric acid to obtain an aluminum sol; soaking the silk fabric in the aluminum sol at a bath ratio of 1:30 at room temperature for 90 minutes, washing the mixture with deionized water three times, and drying the mixture;

[0054] (3) Prepare 1 g / L catechu plant dye solution, immerse the fabric treated in step (2) in it, with a bath ratio of 1:30, dye at 60° C. for 60 min, take out, wash with deionized water 5 times, and dry.

[0055] Example 8

[0056] (1) Prepare 50 mL of 0.3 mol / L aluminum nitrate solution and adjust the pH of the solution to 10 with 5 mol / L ammonia water under stirring at room temperature. A large amount of precipitate will appear in the solution. Centrifuge and wash the precipitate with deionized water until it is neutral.

[0057] (2) mixing the precipitate obtained in step (1) with deionized water at a mass ratio of 1:25, placing the mixture in a water bath at 90° C., and adjusting the pH to 4 with 5 mol / L nitric acid to obtain an aluminum sol; soaking the silk fabric in the aluminum sol at a bath ratio of 1:30 at room temperature for 60 minutes, washing the mixture with deionized water three times, and drying the mixture;

[0058] (3) Adding the madder root to a 50% ethanol aqueous solution at a material-liquid mass ratio of 3.5:100, soaking at room temperature for 5 hours to obtain the madder plant dye extract, immersing the fabric treated in step (2) in the extract at a bath ratio of 1:30, dyeing at 60°C for 30 minutes, taking out, washing with deionized water 4 times, and drying.

[0059] Example 9

[0060] (1) Prepare 50 mL of 0.3 mol / L aluminum nitrate solution and adjust the pH of the solution to 8 with 5 mol / L ammonia water under stirring at room temperature. A large amount of precipitate will appear in the solution. Centrifuge and wash the precipitate with deionized water until it is neutral.

[0061] (2) mixing the precipitate obtained in step (1) with deionized water at a mass ratio of 1:25, placing the mixture in a water bath at 90° C., and adjusting the pH to 4 with 5 mol / L nitric acid to obtain an aluminum sol; soaking the silk fabric in the aluminum sol at a bath ratio of 1:30 at room temperature for 60 minutes, washing the mixture with deionized water three times, and drying the mixture;

[0062] (3) Adding the madder root to a 50% ethanol aqueous solution at a material-liquid mass ratio of 3.5:100, soaking at room temperature for 5 hours to obtain the madder plant dye extract, immersing the fabric treated in step (2) in the extract at a bath ratio of 1:30, dyeing at 60°C for 30 minutes, taking out, washing with deionized water 4 times, and drying.

[0063] Example 10

[0064] (1) Prepare 50 mL of 0.3 mol / L aluminum nitrate solution and adjust the pH of the solution to 9 with 5 mol / L ammonia water under stirring at room temperature. A large amount of precipitate will appear in the solution. Centrifuge and wash the precipitate with deionized water until it is neutral.

[0065] (2) mixing the precipitate obtained in step (1) with deionized water at a mass ratio of 1:25, placing the mixture in a water bath at 90° C., and adjusting the pH to 3 with 5 mol / L nitric acid to obtain an aluminum sol; soaking the silk fabric in the aluminum sol at a bath ratio of 1:30 at room temperature for 60 minutes, washing the mixture with deionized water three times, and drying the mixture;

[0066] (3) Adding the madder root to a 50% ethanol aqueous solution at a material-liquid mass ratio of 3.5:100, soaking at room temperature for 5 hours to obtain the madder plant dye extract, immersing the fabric treated in step (2) in the extract at a bath ratio of 1:30, dyeing at 60°C for 30 minutes, taking out, washing with deionized water 4 times, and drying.

[0067] Example 11

[0068] (1) Prepare 50 mL of 0.3 mol / L aluminum nitrate solution and adjust the pH of the solution to 9 with 5 mol / L ammonia water under stirring at room temperature. A large amount of precipitate will appear in the solution. Centrifuge and wash the precipitate with deionized water until it is neutral.

[0069] (2) mixing the precipitate obtained in step (1) with deionized water at a mass ratio of 1:25, placing the mixture in a water bath at 90° C., and adjusting the pH to 5 with 5 mol / L nitric acid to obtain an aluminum sol; soaking the silk fabric in the aluminum sol at a bath ratio of 1:30 at room temperature for 60 minutes, washing the mixture with deionized water three times, and drying the mixture;

[0070] (3) Adding the madder root to a 50% ethanol aqueous solution at a material-liquid mass ratio of 3.5:100, soaking at room temperature for 5 hours to obtain the madder plant dye extract, immersing the fabric treated in step (2) in the extract at a bath ratio of 1:30, dyeing at 60°C for 30 minutes, taking out, washing with deionized water 4 times, and drying.

[0071] Example 12

[0072] (1) Prepare 50 mL of 0.3 mol / L aluminum nitrate solution and adjust the pH of the solution to 9 with 5 mol / L ammonia water under stirring at room temperature. A large amount of precipitate will appear in the solution. Centrifuge and wash the precipitate with deionized water until it is neutral.

[0073] (2) mixing the precipitate obtained in step (1) with deionized water at a mass ratio of 1:25, placing the mixture in a water bath at 90° C., and adjusting the pH to 6 with 5 mol / L nitric acid to obtain an aluminum sol; soaking the silk fabric in the aluminum sol at a bath ratio of 1:30 at room temperature for 60 minutes, washing the mixture with deionized water three times, and drying the mixture;

[0074] (3) Adding the madder root to a 50% ethanol aqueous solution at a material-liquid mass ratio of 3.5:100, soaking at room temperature for 5 hours to obtain the madder plant dye extract, immersing the fabric treated in step (2) in the extract at a bath ratio of 1:30, dyeing at 60°C for 30 minutes, taking out, washing with deionized water 4 times, and drying.

[0075] Example 13

[0076] (1) Prepare 50 mL of 0.3 mol / L aluminum nitrate solution and adjust the pH of the solution to 9 with 5 mol / L ammonia water under stirring at room temperature. A large amount of precipitate will appear in the solution. Centrifuge and wash the precipitate with deionized water until it is neutral.

[0077] (2) mixing the precipitate obtained in step (1) with deionized water at a mass ratio of 1:50, placing the mixture in a water bath at 90° C., and adjusting the pH to 4 with 5 mol / L nitric acid to obtain an aluminum sol; soaking the silk fabric in the aluminum sol at a bath ratio of 1:30 at room temperature for 60 minutes, washing the mixture with deionized water three times, and drying the mixture;

[0078] (3) Adding the madder root to a 50% ethanol aqueous solution at a material-liquid mass ratio of 3.5:100, soaking at room temperature for 5 hours to obtain the madder plant dye extract, immersing the fabric treated in step (2) in the extract at a bath ratio of 1:30, dyeing at 60°C for 30 minutes, taking out, washing with deionized water 4 times, and drying.

[0079] Example 14

[0080] (1) Prepare 50 mL of 0.3 mol / L aluminum nitrate solution and adjust the pH of the solution to 9 with 5 mol / L ammonia water under stirring at room temperature. A large amount of precipitate will appear in the solution. Centrifuge and wash the precipitate with deionized water until it is neutral.

[0081] (2) mixing the precipitate obtained in step (1) with deionized water at a mass ratio of 1:10, placing the mixture in a water bath at 90° C., and adjusting the pH to 4 with 5 mol / L nitric acid to obtain an aluminum sol; soaking the silk fabric in the aluminum sol at a bath ratio of 1:30 at room temperature for 60 minutes, washing the mixture with deionized water three times, and drying the mixture;

[0082] (3) Adding the madder root to a 50% ethanol aqueous solution at a material-liquid mass ratio of 3.5:100, soaking at room temperature for 5 hours to obtain the madder plant dye extract, immersing the fabric treated in step (2) in the extract at a bath ratio of 1:30, dyeing at 60°C for 30 minutes, taking out, washing with deionized water 4 times, and drying.

[0083] Comparative Example 4-1

[0084] (1) 1 g of silk was added to a 0.5 g / L sodium bicarbonate solution at a bath ratio of 1:50, stirred at room temperature for 30 min, then a 2% (omf) 2 g / L aluminum sulfate solution was added dropwise, and the pH was adjusted to 6 with acetic acid. The mixture was heated to 35°C and reacted for 20 min, cooled, washed with water, and dried;

[0085] (2) Adding madder root to a 50% ethanol aqueous solution at a material-liquid mass ratio of 5:100, soaking at room temperature for 5 hours to obtain a madder plant dye extract, immersing the silk fabric treated in step (1) therein, with a bath ratio of 1:50, dyeing at 60°C for 30 minutes, washing with water, and drying.

[0086] Example 15

[0087] (1) Prepare 100 mL of 2 g / L aluminum sulfate solution. Adjust the pH of the solution to 9 with 5 mol / L ammonia water under stirring at room temperature. A large amount of precipitate will appear in the solution. Centrifuge the solution and wash the precipitate with deionized water until it is neutral.

[0088] (2) The precipitate obtained in step (1) was dispersed in 50 mL of deionized water, and the mixture was placed in a water bath at 90° C., and the pH was adjusted to 4 with 5 mol / L nitric acid to obtain an aluminum sol; 1 g of silk fabric was immersed in the aluminum sol at room temperature (bath ratio 1:50) for 20 min, and then washed with deionized water three times and dried;

[0089] (3) Adding madder root to a 50% ethanol aqueous solution at a material-liquid mass ratio of 5:100, soaking at room temperature for 5 hours to obtain a madder plant dye extract, immersing the fabric treated in step (2) in the madder extract at a bath ratio of 1:50, dyeing at 60°C for 30 minutes, taking out, washing with deionized water 4 times, and then drying.

[0090] Example 16

[0091] Color parameter test: Fold the dyed fabric in half twice and use a datacolor colorimeter to measure the K / S value of the cotton fabric under the test conditions of D65 light source and 10° observation angle. Each sample is tested 4 times in different positions and the average value is taken.

[0092] Table 1 K / S values ​​of dyed fabrics

[0093] K / S value K / S value Example 1 20.30 Example 7 6.97 Comparative Example 1-1 18.62 Example 8 3.99 Example 2 23.55 Example 9 4.34 Example 3 5.06 Example 10 3.95 Comparative Example 3-1 2.81 Example 11 3.83 Comparative Example 3-2 3.78 Example 12 2.10 Example 4 5.45 Example 13 4.17 Example 5 22.72 Example 14 3.18 Example 6 8.49 Comparative Example 4-1 5.18 Example 15 6.34

[0094] The aluminum sol of the present invention has a significant darkening effect on reactive dyes and plant dyes. The color depth (K / S ratio) of the dyed fabrics obtained with the present invention is significantly higher than that of the corresponding comparative examples. While the aluminum nitrate concentration in Comparative Example 3-2 is much higher than that in Example 3, the color depth (K / S ratio) of the treated fabric is lower than that of Example 3. This may be due to the larger aluminum sol particles, which carry a greater positive charge. In step (1), the solution pH was adjusted to 8 or 10 with ammonia water (corresponding to Examples 9 and 8), and the color depth and K / S value of the resulting dyed fabric were both lower than those in Example 3. When the final pH of the sol was 4 (Example 3), the color depth and K / S value of the resulting dyed fabric were higher than those of pH 3 (Example 10), pH 5 (Example 11), and pH 6 (Example 12). When the pH value was too low, the acidity was too strong, and the fabric was severely damaged. When the pH value was too high, the darkening effect was poor, and the color shade of the dyed fabric changed, with the color tending to orange-yellow. Compared with Example 3, during the dissolution process of the precipitate obtained in step (1), the ratio of precipitate to water was too high, the sol viscosity was too high, and it was not easy to penetrate the fiber. When the ratio of precipitate to water was too low (Example 13), the concentration of aluminum micelles in the obtained aluminum sol was low, the color depth and K / S value of the obtained dyed fabric were also low, and the color shade of the dyed fabric was close to that of the unmordanted dyed fabric (Comparative Example 3-1). Therefore, the aluminum sol treatment method of the present invention has a significant darkening effect on the fabric.

Claims

1. A method for increasing the color depth of dyed fabrics using aluminum sol, characterized in that: The method steps are as follows: (1) preparing an aluminum nitrate or aluminum sulfate solution, adjusting the pH value of the aluminum nitrate or aluminum sulfate solution with 5 mol / L ammonia water under stirring at room temperature, causing precipitation to form in the solution, centrifuging, and washing the precipitation with deionized water until it is neutral; (2) dispersing the precipitate obtained in step (1) in deionized water, placing the mixture in a water bath at 90° C., and adjusting the pH value with nitric acid to obtain an aluminum sol; soaking the fabric in the aluminum sol at room temperature, washing the fabric with deionized water, and drying the fabric; (3) preparing a dye solution, immersing the fabric treated in step (2) in the dye solution or plant dye extract, taking out the fabric after dyeing, washing with deionized water, and drying.

2. The method for increasing the color depth of dyed fabrics using aluminum sol according to claim 1, wherein: In step (1), the concentration of the aluminum nitrate solution is 0.2-0.8 mol / L, the concentration of the aluminum sulfate solution is 2 g / L, and the pH value of the aluminum nitrate or aluminum sulfate solution is adjusted to 8-10 by ammonia water.

3. The method for increasing the color depth of dyed fabrics by using aluminum sol according to claim 1, characterized in that: In step (2), the mass ratio of the precipitate to the deionized water is 1:10-1:

50.

4. The method for increasing the color depth of dyed fabrics using aluminum sol according to claim 1, wherein: In step (2), the nitric acid concentration is 5 mol / L, and the pH value is adjusted to 3-6.

5. The method for increasing the color depth of dyed fabrics by using aluminum sol according to claim 1, characterized in that: In step (2), the fabric is cotton fabric or silk fabric, the soaking time is 30 min-120 min; and the fabric is washed 3-5 times.

6. The method for increasing the color depth of dyed fabrics using aluminum sol according to claim 1, wherein: In step (3), the concentration of the dye solution is 1-3 g / L, the bath ratio is 1:30, and the dye is a reactive dye or a powdered plant dye.

7. The method for increasing the color depth of dyed fabrics by using aluminum sol according to claim 6, characterized in that: The plant dye is selected from one of madder, chestnut shell and catechu.

8. The method for increasing the color depth of dyed fabrics using aluminum sol according to claim 1, wherein: In step (3), the plant dye extract is extracted by adding the plant raw material into a 50% ethanol aqueous solution at a material-liquid ratio of 3.5-5:100, and soaking at room temperature for 5 hours to obtain the plant dye extract.

9. The method for increasing the color depth of dyed fabrics using aluminum sol according to claim 1, wherein: In step (3), the dyeing temperature is 60-80°C, the dyeing time is 30-60 minutes, and the dyeing is washed 3-5 times.

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