CN109797572B - Method for improving dye uptake of cellulose fiber dyed by natural dye - Google Patents
Method for improving dye uptake of cellulose fiber dyed by natural dye Download PDFInfo
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Abstract
The invention discloses a method for improving the dye uptake of natural dye dyed cellulose fiber, which comprises the following steps: 1) preparing decamethylcyclopentasiloxane solution with adjuvant; 2) preparing a dyeing solution; 3) completing the preparation of decamethylcyclopentasiloxane staining solution; 4) finishing dyeing to obtain a dyed object; 5) preparing a color fixing solution; 6) completing the preparation of decamethylcyclopentasiloxane color fixing solution; 7) the invention can effectively improve the dye-uptake of the natural dye dyed cellulose fiber, improve the utilization rate of the dye and improve the color fastness to washing. Meanwhile, the decamethylcyclopentasiloxane is an environment-friendly solvent and can be recycled, the water consumption of the dyeing and color fixing method is very low, the water consumption in the dyeing process is effectively reduced, the resources and the cost are saved, and the product value is improved.
Description
Technical Field
The invention relates to the technical field of natural dye dyeing, in particular to a method for improving the dye uptake of cellulose fibers dyed by natural dye.
Background
The problems of low dye-uptake rate and the like of cellulose fibers dyed by natural dyes generally exist, mainly because the natural dyes are difficult to adsorb and fix on the cellulose fibers. Therefore, in order to increase the dye uptake of natural dyes on cellulose fibers, the dye uptake of the dyes and the color fastness to washing of dyed articles can be improved by a dyeing technology of a fore-medium, a co-medium or a after-medium, namely, metal ions are introduced. Natural dyes are generally difficult to up-dye cellulosic fibers, primarily due to their molecular structure. The affinity of the natural dye to the cellulose fiber is poor, so that the dye amount of the dye on the fiber is less in the dyeing process, metal ions are required to be added for complexing, more dye is dyed on the fiber, and the natural dye has better color fastness to washing. However, the use of metal ions, such as chromium ions, nickel ions, etc., may cause certain environmental pollution. Therefore, another green dyeing technique needs to be found.
In order to increase the dye-uptake of the cellulose fiber dyed with natural dyes, it is necessary to make the natural dyes adsorbed onto the fiber as much as possible in the dyeing stage, and then fix the dyed natural dyes to ensure that the dyes dyed onto the fiber are not washed off in the subsequent soaping process. In order to make the cellulose fiber adsorb natural dye as much as possible, a high-concentration natural dye solution may be prepared and uniformly dispersed in a medium of decamethylcyclopentasiloxane (D5) to dye the cellulose fiber.
According to the rule that the distribution of hydrophilic dye aqueous solution between cellulose fiber and decamethylcyclopentasiloxane is greatly beneficial to cellulose fiber, in decamethylcyclopentasiloxane dye liquor, dye is distributed in dyeing medium in high concentration dye liquor microdrops, and the dye liquor microdrops continuously run along with the dyeing medium, repeatedly and fully contact with the cellulose fiber, so that monomolecular dye continuously trapped by cotton fiber is spread on the surface of the fiber. Because the affinity of the dye to water and cellulose fiber is far higher than that of the dye to decamethylcyclopentasiloxane, the transfer process is unidirectional, so that the dye transfer process is repeated in decamethylcyclopentasiloxane dye liquor along with the continuous circulation of the medium until all the dye is transferred to the surface of the fiber, namely the dye uptake can reach 100%.
After the adsorption of the natural dye is completed, a fixation treatment is required in order to enable the already dyed dye to be fixed on the fiber. The existing color fixing procedure is to exhaust the dye liquor after finishing the fiber dyeing, and then inject the dye liquor into the aqueous solution containing the color fixing agent for color fixing treatment. If the traditional fixing process and technology of the aqueous solution of the fixing agent are adopted for fixing, the natural dye previously adsorbed on the fiber can be transferred from the dyed fiber and dissolved in the aqueous solution of the fixing agent, so that the fixation amount of the dye is reduced. Therefore, after dyeing by the decamethylcyclopentasiloxane dye liquor, a decamethylcyclopentasiloxane color fixing system containing high-concentration color fixing agent droplets is adopted for fixing color, so that the natural dye adsorbed on the fiber is retained on the fiber, and the dye-uptake of the natural dye dyed cellulose fiber is improved.
Disclosure of Invention
The invention provides a method for improving the dye uptake of cellulose fibers dyed by natural dyes.
The scheme of the invention is as follows:
a method for improving the dye uptake of cellulose fibers dyed by natural dyes comprises the following steps:
1) respectively taking a surfactant and a cosurfactant, stirring uniformly to prepare an assistant solution, taking the prepared assistant solution, adding the decamethylcyclopentasiloxane solution, stirring uniformly to prepare a decamethylcyclopentasiloxane solution with an assistant;
2) taking 1 to 6 percent of o.m.f dye, dissolving the dye in 50 to 500 percent of o.m.f water to prepare a dyeing solution;
3) adding the decamethylcyclopentasiloxane solution containing the auxiliary agent prepared in the step 1) into the dyeing solution prepared in the step 2), and stirring the mixture uniformly to finish the preparation of the decamethylcyclopentasiloxane dyeing solution;
4) taking cellulose fibers, and immersing the cellulose fibers into the decamethylcyclopentasiloxane dyeing solution prepared in the step 3), wherein the cellulose fibers are dyed for 10-60 min at the temperature of 60-100 ℃, and dyeing is finished to obtain a dyed product;
5) taking a color fixing agent of 1-5% o.m.f, dissolving the color fixing agent in water of 100-500% o.m.f, and preparing a color fixing solution;
6) adding the decamethylcyclopentasiloxane solution containing the auxiliary agent prepared in the step 1) into the color fixing solution prepared in the step 5), and stirring the mixture uniformly to finish the preparation of the decamethylcyclopentasiloxane color fixing solution;
7) and (3) immersing the dyed object in the step 4) into the decamethylcyclopentasiloxane color fixing solution prepared in the step 6), fixing the color of the dyed object at the temperature of 40-90 ℃ for 10-50 min, taking out the dyed object, washing with water, drying, and soaping to remove the loose color, thereby finishing the color fixing.
As a preferable technical scheme, 5g of surfactant and cosurfactant are respectively taken in the step 1), stirred to be uniform and prepared into an auxiliary agent solution.
As a preferred embodiment, the dye is cocoa shell pigment.
As a preferred technical scheme, 4% of dye of o.m.f. is taken in the step 2), and the dye is dissolved in 100% of water of o.m.f.; the cellulose fiber in the step 4) is dyed for 30min at the temperature of 100 ℃.
Preferably, the bath ratio of the cellulose fibers to the decamethylcyclopentasiloxane dyeing liquor in the step 4) is 1: 20.
As a preferred technical scheme, 4% of fixing agent o.m.f. is taken in the step 5), and the fixing agent is dissolved in 100% of o.m.f. water; and (3) fixing the color of the dyeing substance in the step 7) for 30min at the temperature of 80 ℃.
As a preferred technical scheme, the surfactant is AEO-3.
As a preferred technical scheme, the cosurfactant is n-octanol.
As a preferable technical scheme, the bath ratio of the dyeing substance to the decamethylcyclopentasiloxane fixing solution in the step 7) is 1: 20.
Due to the adoption of the technical scheme, the method for improving the dye uptake of the natural dye dyed cellulose fiber comprises the following steps: 1) respectively taking a surfactant and a cosurfactant, stirring uniformly to prepare an assistant solution, taking the prepared assistant solution, adding the decamethylcyclopentasiloxane solution, stirring uniformly to prepare a decamethylcyclopentasiloxane solution with an assistant; 2) taking 1 to 6 percent of o.m.f dye, dissolving the dye in 50 to 500 percent of o.m.f water to prepare a dyeing solution; 3) adding the decamethylcyclopentasiloxane solution containing the auxiliary agent prepared in the step 1) into the dyeing solution prepared in the step 2), and stirring the mixture uniformly to finish the preparation of the decamethylcyclopentasiloxane dyeing solution; 4) taking cellulose fibers, and immersing the cellulose fibers into the decamethylcyclopentasiloxane dyeing solution prepared in the step 3), wherein the cellulose fibers are dyed for 10-60 min at the temperature of 60-100 ℃, and dyeing is finished to obtain a dyed product; 5) taking a color fixing agent of 1-5% o.m.f, dissolving the color fixing agent in water of 100-500% o.m.f, and preparing a color fixing solution; 6) adding the decamethylcyclopentasiloxane solution containing the auxiliary agent prepared in the step 1) into the color fixing solution prepared in the step 5), and stirring uniformly to complete the preparation of the decamethylcyclopentasiloxane color fixing solution; 7) and (3) immersing the dyed object in the step 4) into the decamethylcyclopentasiloxane color fixing solution prepared in the step 5), fixing the color of the dyed object at the temperature of 40-90 ℃ for 10-50 min, taking out the dyed object, washing with water, drying, and soaping to remove the loose color, thereby finishing the color fixing.
The invention has the advantages that: the dyeing quantity of the dye in the natural dye dyed cellulose fiber is effectively improved, the utilization rate of the dye is improved, the color fastness to washing is improved, meanwhile, the decamethylcyclopentasiloxane is an environment-friendly solvent and can be recycled.
Detailed Description
In order to make up for the above deficiencies, the present invention provides a method for increasing the dye uptake of cellulose fibers dyed with natural dyes to solve the above problems in the background art.
A method for improving the dye uptake of cellulose fibers dyed by natural dyes comprises the following steps:
1) respectively taking a surfactant and a cosurfactant, stirring uniformly to prepare an assistant solution, taking the prepared assistant solution, adding the decamethylcyclopentasiloxane solution, stirring uniformly to prepare a decamethylcyclopentasiloxane solution with an assistant;
2) taking 1 to 6 percent of o.m.f dye, dissolving the dye in 50 to 500 percent of o.m.f water to prepare a dyeing solution;
3) adding the decamethylcyclopentasiloxane solution containing the auxiliary agent prepared in the step 1) into the dyeing solution prepared in the step 2), and stirring the mixture uniformly to finish the preparation of the decamethylcyclopentasiloxane dyeing solution;
4) taking cellulose fibers, and immersing the cellulose fibers into the decamethylcyclopentasiloxane dyeing solution prepared in the step 3), wherein the cellulose fibers are dyed for 10-60 min at the temperature of 60-100 ℃, and dyeing is finished to obtain a dyed product;
5) taking a color fixing agent of 1-5% o.m.f, dissolving the color fixing agent in water of 100-500% o.m.f, and preparing a color fixing solution;
6) adding the decamethylcyclopentasiloxane solution containing the auxiliary agent prepared in the step 1) into the color fixing solution prepared in the step 5), and stirring the mixture uniformly to finish the preparation of the decamethylcyclopentasiloxane color fixing solution;
7) and (3) immersing the dyed object in the step 4) into the decamethylcyclopentasiloxane color fixing solution prepared in the step 6), fixing the color of the dyed object at the temperature of 40-90 ℃ for 10-50 min, taking out the dyed object, washing with water, drying, and soaping to remove the loose color, thereby finishing the color fixing.
And in the step 1), 5g of surfactant and cosurfactant are respectively taken and stirred to be uniform to prepare an auxiliary agent solution.
The dye is cocoa shell pigment.
The cellulose fiber is cotton cloth.
Taking 4% o.m.f. dye in the step 2), and dissolving the dye in 100% o.m.f. water; the cellulose fiber in the step 4) is dyed for 30min at the temperature of 100 ℃.
The bath ratio of the cellulose fibers to the decamethylcyclopentasiloxane dyeing liquid in the step 4) is 1: 20.
Taking 4% of color fixing agent o.m.f. in the step 5), and dissolving the color fixing agent in 100% of o.m.f. water; and (3) fixing the color of the dyeing substance in the step 7) for 30min at the temperature of 80 ℃.
The surfactant is AEO-3.
The cosurfactant is n-octanol.
The bath ratio of the dyeing substance to the decamethylcyclopentasiloxane fixing solution in the step 7) is 1: 20.
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example 1:
decamethylcyclopentasiloxane dye liquor is used for dyeing cellulose fiber.
5g of surfactant AEO-3 and cosurfactant n-octanol are respectively taken and stirred to be uniform to prepare an assistant solution. Taking 2.5g of the prepared assistant solution, adding the decamethylcyclopentasiloxane solution to 100mL, and stirring uniformly to prepare the decamethylcyclopentasiloxane solution containing the assistant. 0.06g (3% o.m.f) of cocoa shell pigment is dissolved in 1mL (50% o.m.f), 2mL (100% o.m.f), 4mL (200% o.m.f), 6mL (300% o.m.f), 8mL (400% o.m.f) and 10mL (500% o.m.f) of water respectively to prepare high-concentration natural dye solutions containing cocoa shell pigment with different moisture contents, and then the prepared decamethylcyclopentasiloxane solution containing the auxiliary agent is added to 40mL and stirred uniformly, so that the preparation of decamethylcyclopentasiloxane dye solutions with different moisture contents is completed, and the absorbance of the dye solution before dyeing is detected and is recorded as A0.
2g of cotton cloth was immersed in 40mL (bath ratio 1:20) of decamethylcyclopentasiloxane dye solutions having different water contents, and dyed at 80 ℃ for 60min, and the absorbance of the dyeing residue was measured and recorded as A1.
The adsorption rate of the dye was calculated from the formula E% ([ (a0-a1)/a0] × 100% adsorption rate and is shown in table 1. As the moisture content increases, the adsorption rate tends to decrease. When the decamethylcyclopentasiloxane dye liquor contains 1mL of water, namely 50% o.m.f., the adsorption rate is as high as 99.21%, but the phenomenon of uneven dyeing exists, so that the adsorption rate is not considered. When the water content is 2mL, the adsorption rate is 98.85%, and the dyeing is uniform. Therefore, the optimum moisture content is 2mL, i.e., 100% o.m.f.
TABLE 1 Effect of moisture content on cocoa Shell pigment adsorption Rate
| Moisture content (mL) | 1 | 2 | 4 | 6 | 8 | 10 |
| Moisture corresponds to the amount of fabric weight (o.m.f,%) | 50 | 100 | 200 | 300 | 400 | 500 |
| Adsorption Rate (%) | 99.21 | 98.85 | 92.91 | 84.41 | 84.64 | 82.56 |
Example 2:
decamethylcyclopentasiloxane dye liquor is used for dyeing cellulose fiber.
5g of surfactant AEO-3 and cosurfactant n-octanol are respectively taken and stirred to be uniform to prepare an assistant solution. Taking 2.5g of the prepared assistant solution, adding the decamethylcyclopentasiloxane solution to 100mL, and stirring uniformly to prepare the decamethylcyclopentasiloxane solution containing the assistant. 0.06g (3% o.m.f) of cocoa shell pigment is dissolved in 2mL (100% o.m.f) of water to prepare a high-concentration natural dye solution of the cocoa shell pigment, then the prepared decamethylcyclopentasiloxane solution containing the auxiliary agent is added to 40mL, the mixture is stirred to be uniform, the preparation of the decamethylcyclopentasiloxane dye solution is completed, and the absorbance of the dye solution, namely the absorbance of the dye solution before dyeing, is detected and is marked as A0.
2g of cotton cloth is respectively immersed into 40mL (bath ratio is 1:20) of decamethylcyclopentasiloxane dye liquor, the cotton cloth is dyed at 80 ℃ for 10min, 15min, 20min, 30min, 40min and 50min respectively, and the absorbance of the dyeing residual liquid is measured after dyeing, and is recorded as A1.
The adsorption rate of the dye was calculated from the formula E% ([ (a0-a1)/a0] × 100% adsorption rate and is shown in table 2. The adsorption rate tended to increase with increasing dyeing time and reached an equilibrium of 94.57% at 30 min. Therefore, the optimal dyeing time is 30 min.
TABLE 2 Effect of dyeing time on cocoa Shell pigment adsorption Rate
| Dyeing time (min) | 10 | 15 | 20 | 30 | 40 | 50 |
| Adsorption Rate (%) | 92.83 | 93.83 | 94.29 | 94.97 | 95.01 | 95.08 |
Example 3:
decamethylcyclopentasiloxane dye liquor is used for dyeing cellulose fiber.
5g of surfactant AEO-3 and cosurfactant n-octanol are respectively taken and stirred to be uniform to prepare an assistant solution. Taking 2.5g of the prepared assistant solution, adding the decamethylcyclopentasiloxane solution to 100mL, and stirring uniformly to prepare the decamethylcyclopentasiloxane solution containing the assistant. 0.06g (3% o.m.f) of cocoa shell pigment is dissolved in 2mL (100% o.m.f) of water to prepare a high-concentration natural dye solution of the cocoa shell pigment, then the prepared decamethylcyclopentasiloxane solution containing the auxiliary agent is added to 40mL, the mixture is stirred to be uniform, the preparation of the decamethylcyclopentasiloxane dye solution is completed, and the absorbance of the dye solution, namely the absorbance of the dye solution before dyeing, is detected and is marked as A0.
2g of cotton cloth was immersed in 40mL (bath ratio 1:20) of decamethylcyclopentasiloxane dye solutions, and dyed at 60 ℃, 70 ℃, 80 ℃, 90 ℃, 100 ℃ for 30min, and the absorbance of the dyeing residue was measured and recorded as A1.
The adsorption rate of the dye was calculated according to the formula E% ([ (a0-a1)/a0] × 100% adsorption rate and is shown in table 3. The adsorption rate tended to increase with increasing dyeing temperature and reached a maximum value of 98.05% at 100 ℃. Therefore, the optimum dyeing temperature is 100 ℃.
TABLE 3 Effect of dyeing temperature on cocoa Shell pigment adsorption Rate
| Dyeing temperature (. degree.C.) | 60 | 70 | 80 | 90 | 100 |
| Adsorption Rate (%) | 84.59 | 92.97 | 94.75 | 96.05 | 98.05 |
Example 4:
decamethylcyclopentasiloxane dye liquor is used for dyeing cellulose fiber.
5g of surfactant AEO-3 and cosurfactant n-octanol are respectively taken and stirred to be uniform to prepare an assistant solution. Taking 2.5g of the prepared assistant solution, adding the decamethylcyclopentasiloxane solution to 100mL, and stirring uniformly to prepare the decamethylcyclopentasiloxane solution containing the assistant. 0.02g (1% o.m.f.), 0.04g (2% o.m.f.), 0.06g (3% o.m.f.), 0.08g (4% o.m.f.), 0.10g (5% o.m.f.) and 0.12g (6% o.m.f) of cocoa shell pigment are dissolved in 2mL (100% o.m.f) of water to prepare high-concentration natural dye solutions containing different dye masses, and then the prepared decamethylcyclopentasiloxane solution containing the auxiliary agent is added to 40mL and stirred uniformly to complete the preparation of the decamethylcyclopentasiloxane dye solution, and the absorbance of the decamethylcyclopentasiloxane dye solution, namely the absorbance of the dye solution before dyeing, is detected and is recorded as A0.
2g of cotton cloth was immersed in 40mL (bath ratio 1:20) of decamethylcyclopentasiloxane dye solutions containing different dye masses, and dyed at 100 ℃ for 30min, and the absorbance of the dyeing residue was measured and recorded as A1.
The adsorption rate of the dye was calculated according to the formula E% ([ (a0-a1)/a0] × 100% adsorption rate and is shown in table 4. As the amount of dye used was increased, the adsorption rate tended to increase, reaching a maximum of 98.30% at 0.08g, and then decreased. Therefore, the optimal dye loading is 0.08g, i.e. 4% o.m.f.
TABLE 4 influence of dye dosage on cocoa husk pigment adsorption
| Amount of dye (g) | 0.02 | 0.04 | 0.06 | 0.08 | 0.10 | 0.12 |
| Amount of dye to fabric weight (o.m.f,%) | 1 | 2 | 3 | 4 | 5 | 6 |
| Adsorption Rate (%) | 97.74 | 97.79 | 98.05 | 98.30 | 98.10 | 97.94 |
Therefore, the best conditions for dyeing cotton fiber by the cocoa shell pigment dyeing solution of decamethylcyclopentasiloxane are that the water content is 10% o.m.f, the dyeing time is 30min, the dyeing temperature is 100 ℃, and the dye dosage is 4% o.m.f.
Example 5:
and (3) fixing the dyed cellulose fiber by the decamethylcyclopentasiloxane fixing solution.
5g of surfactant AEO-3 and cosurfactant n-octanol are respectively taken and stirred to be uniform to prepare an assistant solution. Taking 2.5g of the prepared assistant solution, adding the decamethylcyclopentasiloxane solution to 100mL, and stirring uniformly to prepare the decamethylcyclopentasiloxane solution containing the assistant. 0.08g (4% o.m.f) of color fixing agent is taken and dissolved in 2mL (100% o.m.f), 4mL (200% o.m.f), 6mL (300% o.m.f), 8mL (400% o.m.f) and 10mL (500% o.m.f) of water respectively to prepare color fixing solutions with different contents and high concentrations, then the prepared decamethylcyclopentasiloxane solution containing the auxiliary agent is added to 40mL, and the mixture is stirred to be uniform, so that the preparation of the decamethylcyclopentasiloxane color fixing solution containing different moisture contents is completed.
Dyeing cotton fibers by using cocoa shell pigment dye liquor of decamethylcyclopentasiloxane under the optimal condition, taking out dyed objects after dyeing, washing with water, drying, and measuring the K/S value of the dyed objects, wherein the K/S value is marked as (K/S) 0; the dye adsorption rate was 98.30%.
2g of the dyeing material is taken and respectively immersed into 40mL (bath ratio is 1:20) of prepared decamethylcyclopentasiloxane color fixing solution containing different moisture contents, the color is fixed for 30min at 40 ℃, then the dyeing material is taken out, washed by water, dried and soaped to remove the loose color, and the K/S value of the dyeing material is measured and is marked as (K/S) 1.
The fixation and dye uptake of the dye was calculated according to the fixation formula F% [ (K/S)1/(K/S)0 ]. times.100%, and the dye uptake formula T%. times.e%. times.f%. times.100, and are shown in table 5. The fixation rate and the dye-uptake of the dyed object which is not subjected to fixation treatment are respectively 49.17 percent and 48.33 percent and are far lower than those of the dyed object subjected to fixation treatment, which shows that the fixation rate and the dye-uptake of the dye subjected to fixation treatment are obviously improved. After the color fixing treatment, the color fixing rate and the dye-uptake rate of the dye tend to decrease along with the increase of the moisture content. The fixation and dye uptake was 93.99% and 92.39% at maximum when 2mL of moisture was present. Therefore, the optimum moisture content is 2mL, i.e., 100% o.m.f.
TABLE 5 Effect of moisture content on cocoa husk pigment fixation
Example 6:
and (3) fixing the dyed cellulose fiber by the decamethylcyclopentasiloxane fixing solution.
5g of surfactant AEO-3 and cosurfactant n-octanol are respectively taken and stirred to be uniform to prepare an assistant solution. Taking 2.5g of the prepared assistant solution, adding the decamethylcyclopentasiloxane solution to 100mL, and stirring uniformly to prepare the decamethylcyclopentasiloxane solution containing the assistant. Dissolving 0.08g (4% o.m.f) of color fixing agent in 2mL (100% o.m.f) of water to prepare a high-concentration color fixing solution, then adding the prepared decamethylcyclopentasiloxane solution containing the auxiliary agent to 40mL, and stirring until the solution is uniform, thereby completing the preparation of the decamethylcyclopentasiloxane color fixing solution.
Dyeing is carried out under the optimal condition that the cotton fiber is dyed by cocoa shell pigment dye liquor of decamethylcyclopentasiloxane, and the dyed object is taken out after dyeing, washed by water, dried, and measured the K/S value of the dyed object and recorded as (K/S) 0.
2g of the dyeing material is taken and immersed into 40mL (bath ratio is 1:20) of decamethylcyclopentasiloxane color fixing solution, color fixing is carried out for 10min, 20min, 30min, 40min and 50min respectively at 40 ℃, then the dyeing material is taken out, washed by water, dried and soaped to remove floating color, and the K/S value of the dyeing material is measured and recorded as (K/S) 1.
The fixation and dye uptake of the dye was calculated according to the fixation formula F% [ (K/S)1/(K/S)0 ]. times.100%, and the dye uptake formula T%. times.e%. times.f%. times.100, and are shown in table 6. The fixation rate and the dye-uptake of the dyed object which is not subjected to fixation treatment are respectively 49.17 percent and 48.33 percent and are far lower than those of the dyed object subjected to fixation treatment, which shows that the fixation rate and the dye-uptake of the dye subjected to fixation treatment are obviously improved. After the fixation treatment, the fixation rate of the dye firstly tends to increase along with the extension of the fixation time. After fixation for 30min, the fixation and dye uptake reached maximum values of 92.79% and 91.21%, respectively, and then declined. Therefore, the optimal fixation time is 30 min.
TABLE 6 Effect of fixation time on fixation and exhaustion of cocoa Shell pigments
| Fixation time (min) | Unfixed | 10 | 20 | 30 | 40 | 50 |
| Fixation ratio (%) | 49.17 | 92.16 | 92.31 | 92.79 | 92.50 | 92.37 |
| Dye uptake (%) | 48.33 | 90.59 | 90.74 | 91.21 | 90.93 | 90.80 |
Example 7:
and (3) fixing the dyed cellulose fiber by the decamethylcyclopentasiloxane fixing solution.
5g of surfactant AEO-3 and cosurfactant n-octanol are respectively taken and stirred to be uniform to prepare an assistant solution. Taking 2.5g of the prepared assistant solution, adding the decamethylcyclopentasiloxane solution to 100mL, and stirring uniformly to prepare the decamethylcyclopentasiloxane solution containing the assistant. Dissolving 0.08g (4% o.m.f) of color fixing agent in 2mL (100% o.m.f) of water to prepare a high-concentration color fixing solution, then adding the prepared decamethylcyclopentasiloxane solution containing the auxiliary agent to 40mL, and stirring until the solution is uniform, thereby completing the preparation of the decamethylcyclopentasiloxane color fixing solution.
Dyeing is carried out under the optimal condition that the cotton fiber is dyed by cocoa shell pigment dye liquor of decamethylcyclopentasiloxane, and the dyed object is taken out after dyeing, washed by water, dried, and measured the K/S value of the dyed object and recorded as (K/S) 0.
2g of the dyeing material is taken and immersed into 40mL (bath ratio is 1:20) of decamethylcyclopentasiloxane color fixing solution, the color is fixed for 30min at 40 ℃, 50 ℃, 60 ℃, 70 ℃, 80 ℃ and 90 ℃, and then the dyeing material is taken out, washed by water, dried and soaped to remove the floating color, and the K/S value of the dyeing material is measured and recorded as (K/S) 1.
The fixation and dye uptake of the dye was calculated according to the fixation formula F% [ (K/S)1/(K/S)0 ]. times.100%, and the dye uptake formula T%. times.e%. times.f%. times.100, and are shown in table 7. The fixation rate and the dye-uptake of the dyed object which is not subjected to fixation treatment are respectively 49.17 percent and 48.33 percent and are far lower than those of the dyed object subjected to fixation treatment, which shows that the fixation rate and the dye-uptake of the dye subjected to fixation treatment are obviously improved. After the fixation treatment, the fixation rate and the dye uptake of the dye tend to increase along with the increase of the fixation temperature. When the fixing temperature was 80 ℃, the fixation and dye uptake reached a maximum of 93.79% and 92.20%, respectively, and then decreased. Therefore, the optimum fixing temperature is 80 ℃.
TABLE 7 Effect of fixation temperature on fixation and exhaustion of cocoa Shell pigments
| Fixation temperature (. degree.C.) | Unfixed | 40 | 50 | 60 | 70 | 80 | 90 |
| Fixation ratio (%) | 49.17 | 92.00 | 92.50 | 92.84 | 93.49 | 93.79 | 93.68 |
| Dye uptake (%) | 48.33 | 90.44 | 90.93 | 91.26 | 91.90 | 92.20 | 92.09 |
Example 8:
and (3) fixing the dyed cellulose fiber by the decamethylcyclopentasiloxane fixing solution.
5g of surfactant AEO-3 and cosurfactant n-octanol are respectively taken and stirred to be uniform to prepare an assistant solution. Taking 2.5g of the prepared assistant solution, adding the decamethylcyclopentasiloxane solution to 100mL, and stirring uniformly to prepare the decamethylcyclopentasiloxane solution containing the assistant. 0.02g (1% o.m.f.), 0.04g (2% o.m.f.), 0.06g (3% o.m.f.), 0.08g (4% o.m.f.) and 0.10g (5% o.m.f) of color fixing agents are respectively dissolved in 2mL (100% o.m.f) of water to prepare color fixing solutions with different color fixing agent dosages and high concentrations, then the prepared decamethylcyclopentasiloxane solution containing the auxiliary agent is respectively added to 40mL, and the mixture is stirred uniformly to complete the preparation of the decamethylcyclopentasiloxane color fixing solution.
Dyeing is carried out under the optimal condition that the cotton fiber is dyed by cocoa shell pigment dye liquor of decamethylcyclopentasiloxane, and the dyed object is taken out after dyeing, washed by water, dried, and measured the K/S value of the dyed object and recorded as (K/S) 0.
2g of the dyeing material is taken and immersed into 40mL (bath ratio is 1:20) of decamethylcyclopentasiloxane color fixing solution, color fixing is carried out for 30min at 80 ℃, then the dyeing material is taken out, washed by water, dried and soaped to remove floating color, and the K/S value of the dyeing material is measured and recorded as (K/S) 1.
The fixation and dye uptake of the dye was calculated according to the fixation formula F% [ (K/S)1/(K/S)0 ]. times.100%, and the dye uptake formula T%. times.e%. times.f%. times.100, and are shown in table 8. The fixation rate and the dye-uptake of the dyed object which is not subjected to fixation treatment are respectively 49.17 percent and 48.33 percent and are far lower than those of the dyed object subjected to fixation treatment, which shows that the fixation rate and the dye-uptake of the dye subjected to fixation treatment are obviously improved. After the color fixing treatment, the color fixing rate and the dye-uptake rate of the dye tend to increase along with the increase of the dosage of the color fixing agent. When the fixing agent amount was 0.08g, i.e. 4% o.m.f., the fixation and dye uptake reached a maximum of 94.75% and 93.14, respectively, and then remained stable. Therefore, the optimal amount of fixing agent is 0.08g, i.e. 4% o.m.f.
TABLE 8 Effect of dye fixative dose on cocoa shell pigment fixation and exhaustion
Therefore, the optimal conditions for fixing the dyed cotton fiber by the decamethylcyclopentasiloxane fixing solution are that the water content is 10% o.m.f, the fixing time is 30min, the fixing temperature is 80 ℃, and the using amount of the fixing agent is 4% o.m.f.
Therefore, when the dyeing is carried out under the condition that the optimal cocoa shell pigment dyeing solution of decamethylcyclopentasiloxane dyes cotton fibers and the color fixation is carried out under the condition that the optimal color fixing solution of decamethylcyclopentasiloxane fixes the dyed cotton fibers, the dye-uptake of the cocoa shell pigment dyed cotton fibers can reach the maximum value of 93.14%.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A method for improving the dye uptake of cellulose fibers dyed by natural dyes is characterized by comprising the following steps:
1) respectively taking a surfactant and a cosurfactant, stirring uniformly to prepare an assistant solution, taking the prepared assistant solution, adding the decamethylcyclopentasiloxane solution, stirring uniformly to prepare a decamethylcyclopentasiloxane solution with an assistant;
2) taking 1 to 6 percent of o.m.f dye, dissolving the dye in 50 to 500 percent of o.m.f water to prepare a dyeing solution;
3) taking the decamethylcyclopentasiloxane solution containing the auxiliary agent prepared in the step 1), adding the decamethylcyclopentasiloxane solution into the dyeing solution prepared in the step 2), and stirring the solution uniformly to finish the preparation of the decamethylcyclopentasiloxane dyeing solution;
4) taking cellulose fibers, and immersing the cellulose fibers into the decamethylcyclopentasiloxane dyeing solution prepared in the step 3), wherein the cellulose fibers are dyed for 10-60 min at the temperature of 60-100 ℃, and dyeing is finished to obtain a dyed product; the bath ratio of the cellulose fibers to the decamethylcyclopentasiloxane dyeing liquor is 1: 20;
5) taking a color fixing agent of 1-5% o.m.f, dissolving the color fixing agent in water of 100-500% o.m.f, and preparing a color fixing solution;
6) adding the decamethylcyclopentasiloxane solution containing the auxiliary agent prepared in the step 1) into the color fixing solution prepared in the step 5), and stirring the mixture uniformly to finish the preparation of the decamethylcyclopentasiloxane color fixing solution;
7) soaking the dyed object in the step 4) into the decamethylcyclopentasiloxane color fixing solution prepared in the step 6), fixing the color of the dyed object at the temperature of 40-90 ℃ for 10-50 min, taking out, washing with water, drying, and soaping to remove the loose color, thereby finishing the color fixing; the bath ratio of the dyeing substance to the decamethylcyclopentasiloxane color fixing solution is 1: 20.
2. A method of increasing the dye uptake of natural dye dyed cellulosic fibers as claimed in claim 1 wherein: and in the step 1), 5g of surfactant and cosurfactant are respectively taken and stirred to be uniform to prepare an auxiliary agent solution.
3. A method of increasing the dye uptake of natural dye dyed cellulosic fibers as claimed in claim 1 wherein: taking 4% o.m.f. dye in the step 2), and dissolving the dye in 100% o.m.f. water; the cellulose fiber in the step 4) is dyed for 30min at the temperature of 100 ℃.
4. A method of increasing the dye uptake of natural dye dyed cellulosic fibers as claimed in claim 1 wherein: the dye is cocoa shell pigment, and the cellulose fiber is cotton cloth.
5. A method of increasing the dye uptake of natural dye dyed cellulosic fibers as claimed in claim 1 wherein: taking 4% of color fixing agent o.m.f. in the step 5), and dissolving the color fixing agent in 100% of o.m.f. water; and (3) fixing the color of the dyeing substance in the step 7) for 30min at the temperature of 80 ℃.
6. A method of increasing the dye uptake of natural dye dyed cellulosic fibers as claimed in claim 1 wherein: the surfactant is AEO-3.
7. A method of increasing the dye uptake of natural dye dyed cellulosic fibers as claimed in claim 1 wherein: the cosurfactant is n-octanol.
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| CN102154849A (en) * | 2011-04-07 | 2011-08-17 | 浙江理工大学 | Dyeing process of pure cotton fabric |
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