Method for dyeing wool with natural vegetable dye
By using a mixture of water and ethyl acetate and natural plant dye to dye the wool, the problems of poor dye reproducibility, severe dye degradation, low utilization rate and large water consumption were solved, and efficient and environmentally friendly dyeing effect was achieved.
Patent Information
- Application Number
- CN202510203083.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2025-06-06
AI Technical Summary
In the prior art, natural plant dye wool dyes have problems such as poor dye reproducibility, severe dye degradation, low utilization rate and large water consumption.
A mixture of water and ethyl acetate is mixed with natural plant dye to form a dye solution, and the wool is dyed without the addition of mottled agents.
It improves the utilization rate of natural plant dyes and the dyeing rate of wool, reduces the degradation of dyes and water consumption during the dyeing process, and is green and environmentally friendly in the dyeing process.
Smart Images
Figure BDA0005283734410000101
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of wool dyeing, and in particular to a method for dyeing wool with natural plant dyes. Background Art
[0002] Natural plant dyes are pigments extracted from the flowers, leaves, fruits, bark and other parts of plants, which can be used to dye textiles. Compared with synthetic dyes, natural plant dyes are environmentally friendly, non-toxic and harmless, and therefore are becoming more and more popular. Wool fiber is a natural protein fiber, which is widely used in clothing and textiles due to its excellent texture, soft feel, good hygroscopicity, elasticity, breathability, warmth retention and wearing comfort. However, when dyeing wool with most natural plant dyes, mordants are required to improve the dye uptake and dye fastness of the dyes. However, the addition of metal mordants will change the color of natural plant dyes and increase the difficulty of dyeing reproducibility. In addition, the addition of metal mordants may also cause the metal ion content of textiles to exceed the standard after dyeing. At the same time, wool needs to be dyed under high temperature conditions to promote the dye molecules to dye onto wool fibers. However, most natural plant dyes are not resistant to high temperatures. Natural plant dyes that dissolve in water will degrade during the long dyeing process, which reduces the utilization rate of natural plant dyes. At the same time, long-term high-temperature dyeing will also increase the damage to wool. Summary of the invention
[0003] The purpose of the invention is to overcome the problems of poor dyeing reproducibility, serious degradation of natural plant dyes, low utilization rate of natural plant dyes and large water consumption in the prior art of wool dyeing with natural plant dyes, and to provide a method for dyeing wool with natural plant dyes. The method can reduce water consumption and does not require the addition of a mordant, and the used ethyl acetate is easy to recycle, which is green and environmentally friendly. At the same time, dyeing wool with the method can improve the utilization rate of the natural plant dye and the dyeing rate of the wool, and the dyeing is fast and efficient, thereby reducing the degradation of the natural plant dye at high temperature.
[0004] In order to achieve the above object, the present invention provides a method for dyeing wool with natural plant dyes, the method comprising the following steps:
[0005] (1) preparing a mixed solution of water and ethyl acetate, and then mixing the mixed solution with a natural plant dye to form a dye solution;
[0006] (2) placing the wool in the dyeing solution for dyeing;
[0007] (3) taking out the dyed wool and removing the floating color;
[0008] Wherein, in step (1), the volume content of ethyl acetate in the mixed solution is ≤90%.
[0009] Preferably, in step (1), the volume content of ethyl acetate in the mixed solution is 70-90%.
[0010] Preferably, the weight ratio of the wool to the natural plant dye is 100:0.1-10.
[0011] Preferably, the ratio of the volume of the mixed solution to the weight of the wool is 10-50 mL: 1 g.
[0012] Preferably, in step (1), the natural plant dye is selected from one or more of gardenia yellow natural plant dye, gardenia blue natural plant dye and watermelon red natural plant dye.
[0013] Preferably, in step (2), the dyeing conditions include: temperature of 70-100° C. and time of 10-60 min.
[0014] Preferably, in step (2), the dyeing conditions include: temperature of 80-90° C. and time of 15-40 min.
[0015] Preferably, in step (2), the dyeing is carried out under stirring.
[0016] Preferably, in step (2), the dyeing heating rate is 0.5 to 5°C / min.
[0017] Preferably, in step (3), the process of removing floating color includes solid-liquid separation, soaping and drying.
[0018] The method of the present invention uses natural plant dyes to dye wool quickly and efficiently with a high dyeing rate, and can also reduce the problem of low utilization rate of natural plant dyes due to high-temperature degradation during the dyeing process. No mordant is added during the dyeing process, thereby avoiding the problem of color change of natural plant dyes and excessive metal ion content in dyed fabrics. At the same time, the water consumption during the dyeing process is extremely small and the remaining ethyl acetate is easy to recycle, which is green and environmentally friendly. DETAILED DESCRIPTION
[0019] The specific embodiments of the present invention are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.
[0020] The endpoints and any values of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the endpoint values of each range, the endpoint values of each range and the individual point values, and the individual point values can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.
[0021] The present invention provides a method for dyeing wool with natural plant dyes, the method comprising the following steps:
[0022] (1) preparing a mixed solution of water and ethyl acetate, and then mixing the mixed solution with a natural plant dye to form a dye solution;
[0023] (2) placing the wool in the dyeing solution for dyeing;
[0024] (3) taking out the dyed wool and removing the floating color;
[0025] Wherein, in step (1), the volume content of ethyl acetate in the mixed solution is ≤90%.
[0026] The method of the present invention is used to dye wool, so that the dyeing rate of natural plant dyes on wool can be improved. This is mainly because the addition of ethyl acetate accelerates the adsorption of natural plant dyes in aqueous solution by wool, and can also reduce the problem of degradation of natural plant dyes due to high temperature during the dyeing process. In addition, during the dyeing process, part of ethyl acetate can be decomposed into ethanol and acetic acid under high temperature conditions, ethanol helps the swelling of wool fibers, and acetic acid helps to increase amino cations in wool molecules, thereby increasing the dyeing rate of natural plant dyes. Moreover, no mordant is added during the entire dyeing process, so that the problem of color change of natural plant dyes and excessive metal ion content in dyed fabrics is avoided. At the same time, the water consumption during the dyeing process is extremely small and the remaining ethyl acetate is easy to be recycled, which is green and environmentally friendly.
[0027] In a preferred embodiment, in order to improve the dyeing rate and levelness of natural plant dyes on wool, in step (1), the volume content of ethyl acetate in the mixed solution is 70-90%; specifically, the volume content of ethyl acetate in the mixed solution can be 70%, 75%, 80%, 85% or 90%.
[0028] In the present invention, the weight ratio of the wool to the natural plant dye is controlled according to the need for wool dyeing depth; in a preferred embodiment, in order to improve the dyeing rate and levelness of the natural plant dye on wool, the weight ratio of the wool to the natural plant dye is 100:0.1-10; specifically, the weight ratio of the wool to the natural plant dye can be 100:0.1, 100:0.5, 100:1, 100:2, 100:3, 100:4, 100:5, 100:6, 100:7, 100:8, 100:9 or 100:10.
[0029] In a preferred embodiment, in order to further improve the dyeing rate and levelness of natural plant dyes on wool, the ratio of the volume of the mixed solution to the weight of the wool is 10-50 mL: 1 g; preferably 20-40 mL: 1 g.
[0030] In the present invention, there is no special requirement for the natural plant dye, and any natural plant dye commonly used in the art can be used. In a preferred embodiment, in step (1), the natural plant dye is selected from one or more of gardenia yellow natural plant dye, gardenia blue natural plant dye and watermelon red natural plant dye.
[0031] In a preferred embodiment, in order to further improve the dyeing rate of natural plant dyes on wool while reducing the degradation of natural plant dyes, in step (2), the dyeing conditions include: a temperature of 70 to 100° C. and a time of 10 to 60 minutes.
[0032] In a preferred embodiment, in order to further improve the dyeing rate of natural plant dyes on wool while reducing the degradation of natural plant dyes, in step (2), the dyeing conditions include: a temperature of 80 to 90° C. and a time of 15 to 40 minutes.
[0033] In a preferred embodiment, in order to improve the dyeing rate and levelness of natural plant dyes on wool, in step (2), the dyeing is carried out under stirring.
[0034] In a preferred embodiment, in order to improve the dyeing rate and levelness of natural plant dyes on wool, in step (2), the dyeing heating rate is 0.5 to 5°C / min; specifically, the dyeing heating rate can be 0.5°C / min, 1°C / min, 1.5°C / min, 2°C / min, 3°C / min, 4°C / min or 5°C / min.
[0035] In a preferred embodiment, in step (3), the process of removing floating color includes solid-liquid separation, soaping and drying; the residual liquid (water, ethyl acetate and dye) on the dyed wool is removed by solid-liquid separation, then the floating color is removed by soaping, and finally drying is performed.
[0036] In the present invention, there is no special requirement for the operations of solid-liquid separation, soaping and drying, and conventional operations in the art can be used.
[0037] The following examples further illustrate the method for dyeing wool with natural plant dyes of the present invention. The examples are implemented based on the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following examples.
[0038] The experimental methods in the following examples, unless otherwise specified, are all conventional methods in the art. The experimental materials used in the following examples, unless otherwise specified, are all commercially available.
[0039] Example 1
[0040] (1) preparing a mixed solution of water and ethyl acetate, wherein the volume content of ethyl acetate in the mixed solution is 90%, and then mixing 50 mL of the mixed solution with 0.04 g of gardenia natural plant dye to form a dye solution;
[0041] (2) placing 2 g of wool in the dye solution, heating the temperature to 90° C. at a heating rate of 2° C. / min, and then dyeing the mixture for 20 min;
[0042] (3) Take out the dyed wool, use a centrifugal dehydrator to remove the residual liquid (water, ethyl acetate and dye), and then soap and dry it.
[0043] Example 2
[0044] (1) preparing a mixed solution of water and ethyl acetate, wherein the volume content of ethyl acetate in the mixed solution is 70%, and then mixing 50 mL of the mixed solution with 0.04 g of gardenia blue natural plant dye to form a dye solution;
[0045] (2) placing 2 g of wool in the dye solution, heating the temperature to 80° C. at a heating rate of 2° C. / min, and then keeping the temperature to dye for 40 minutes;
[0046] (3) Take out the dyed wool, use a centrifugal dehydrator to remove the residual liquid (water, ethyl acetate and dye), and then soap and dry it.
[0047] Example 3
[0048] (1) preparing a mixed solution of water and ethyl acetate, wherein the volume content of ethyl acetate in the mixed solution is 90%, and then mixing 40 mL of the mixed solution with 0.04 g of gardenia natural plant dye to form a dye solution;
[0049] (2) placing 2 g of wool in the dye solution, heating the temperature to 90° C. at a heating rate of 2° C. / min, and then dyeing the mixture for 20 min;
[0050] (3) Take out the dyed wool, use a centrifugal dehydrator to remove the residual liquid (water, ethyl acetate and dye), and then soap and dry it.
[0051] Example 4
[0052] (1) preparing a mixed solution of water and ethyl acetate, wherein the volume content of ethyl acetate in the mixed solution is 90%, and then mixing 50 mL of the mixed solution with 0.04 g of gardenia natural plant dye to form a dye solution;
[0053] (2) placing 2 g of wool in the dye solution, heating the temperature to 70° C. at a heating rate of 2° C. / min, and then dyeing the mixture for 20 min;
[0054] (3) Take out the dyed wool, use a centrifugal dehydrator to remove the residual liquid (water, ethyl acetate and dye), and then soap and dry it.
[0055] Example 5
[0056] (1) preparing a mixed solution of water and ethyl acetate, wherein the volume content of ethyl acetate in the mixed solution is 90%, and then mixing 50 mL of the mixed solution with 0.04 g of gardenia natural plant dye to form a dye solution;
[0057] (2) placing 2 g of wool in the dye solution, heating the temperature to 90° C. at a heating rate of 2° C. / min, and then dyeing the mixture for 10 min;
[0058] (3) Take out the dyed wool, use a centrifugal dehydrator to remove the residual liquid (water, ethyl acetate and dye), and then soap and dry it.
[0059] Example 6
[0060] (1) preparing a mixed solution of water and ethyl acetate, wherein the volume content of ethyl acetate in the mixed solution is 90%, and then mixing 50 mL of the mixed solution with 0.04 g of gardenia natural plant dye to form a dye solution;
[0061] (2) placing 2 g of wool in the dye solution, heating the temperature to 60° C. at a heating rate of 2° C. / min, and then dyeing the mixture for 20 min;
[0062] (3) Take out the dyed wool, use a centrifugal dehydrator to remove the residual liquid (water, ethyl acetate and dye), and then soap and dry it.
[0063] Comparative Example 1
[0064] (1) 50 mL of water and 0.04 g of Gardenia jasminoides natural plant dye were mixed and stirred to form a dye solution;
[0065] (2) placing 2 g of wool in the dye solution, heating the temperature to 90° C. at a heating rate of 2° C. / min, and then dyeing the mixture for 20 min;
[0066] (3) Take out the dyed wool, use a centrifugal dehydrator to remove the residual liquid (water and dye), and then soap and dry it.
[0067] Comparative Example 2
[0068] (1) preparing a mixed solution of water and ethyl propionate, wherein the volume content of ethyl propionate in the mixed solution is 90%, and then mixing 50 mL of the mixed solution with 0.04 g of gardenia natural plant dye to form a dye solution;
[0069] (2) placing 2 g of wool in the dye solution, heating the temperature to 90° C. at a heating rate of 2° C. / min, and then dyeing the mixture for 20 min;
[0070] (3) Take out the dyed wool, use a centrifugal dehydrator to remove the residual liquid (water, ethyl propionate and dye), and then soap and dry it.
[0071] Comparative Example 3
[0072] (1) preparing a mixed solution of water and ethyl acetate, wherein the volume content of ethyl acetate in the mixed solution is 95%, and then mixing 50 mL of the mixed solution with 0.04 g of gardenia natural plant dye to form a dye solution;
[0073] (2) placing 2 g of wool in the dye solution, heating the temperature to 90° C. at a heating rate of 2° C. / min, and then dyeing the mixture for 20 min;
[0074] (3) Take out the dyed wool, use a centrifugal dehydrator to remove the residual liquid (water, ethyl acetate and dye), and then soap and dry it.
[0075] Comparative Example 4
[0076] (1) 50 mL of water and 0.04 g of gardenia blue natural plant dye were mixed and stirred to form a dye solution;
[0077] (2) placing 2 g of wool in the dye solution, heating the temperature to 80° C. at a heating rate of 2° C. / min, and then keeping the temperature to dye for 40 minutes;
[0078] (3) Take out the dyed wool, use a centrifugal dehydrator to remove the residual liquid (water and dye), and then soap and dry it.
[0079] Comparative Example 5
[0080] (1) preparing a mixed solution of water and ethyl propionate, wherein the volume content of ethyl propionate in the mixed solution is 70%, and then mixing 50 mL of the mixed solution with 0.04 g of gardenia blue natural plant dye to form a dye solution;
[0081] (2) placing 2 g of wool in the dye solution, heating the temperature to 80° C. at a heating rate of 2° C. / min, and then keeping the temperature to dye for 40 minutes;
[0082] (3) Take out the dyed wool, use a centrifugal dehydrator to remove the residual liquid (water, ethyl propionate and dye), and then soap and dry it.
[0083] Comparative Example 6
[0084] (1) preparing a mixed solution of water and ethyl acetate, wherein the volume content of ethyl acetate in the mixed solution is 95%, and then mixing 50 mL of the mixed solution with 0.04 g of gardenia blue natural plant dye to form a dye solution;
[0085] (2) placing 2 g of wool in the dye solution, heating the temperature to 90° C. at a heating rate of 2° C. / min, and then dyeing the mixture for 20 min;
[0086] (3) Take out the dyed wool, use a centrifugal dehydrator to remove the residual liquid (water, ethyl acetate and dye), and then soap and dry it.
[0087] Test Case
[0088] The K / S values of the dyed fabrics of the embodiment and the comparative example were tested, and the level dyeing effect of the fabrics was observed. The results are shown in Table 1.
[0089] Table 1
[0090]
[0091]
[0092] "-" means the wool has very poor levelness after dyeing and the K / S value cannot be measured
[0093] It can be seen from the results in Table 1 that the method described in the present invention can be used to dye wool with natural plant dyes to obtain a good leveling effect, while the dyeing rate and fixation rate are high and the dyeing is fast, and the degradation of natural plant dyes at high temperatures can be reduced.
[0094] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.
Claims
1. A method for dyeing wool with natural plant dyes, characterized in that: The method comprises the following steps: (1) preparing a mixed solution of water and ethyl acetate, and then mixing the mixed solution with a natural plant dye to form a dye solution; (2) placing the wool in the dyeing solution for dyeing; (3) taking out the dyed wool and removing the floating color; Wherein, in step (1), the volume content of ethyl acetate in the mixed solution is ≤90%.
2. The method according to claim 1, characterized in that In step (1), the volume content of ethyl acetate in the mixed solution is 70-90%.
3. The method according to claim 1 or 2, characterized in that: The weight ratio of the wool to the natural plant dye is 100:0.1-10.
4. The method according to claim 3, characterized in that The ratio of the volume of the mixed solution to the weight of the wool is 10-50 mL: 1 g.
5. The method according to claim 1 or 4, characterized in that: In step (1), the natural plant dye is selected from one or more of gardenia yellow natural plant dye, gardenia blue natural plant dye and watermelon red natural plant dye.
6. The method according to claim 5, characterized in that In step (2), the dyeing conditions include: temperature of 70 to 100° C. and time of 10 to 60 min.
7. The method according to claim 1 or 6, characterized in that: In step (2), the dyeing conditions include: temperature of 80 to 90° C. and time of 15 to 40 minutes.
8. The method according to claim 7, characterized in that In step (2), the dyeing is carried out under stirring.
9. The method according to claim 1 or 8, characterized in that: In step (2), the dyeing heating rate is 0.5 to 5°C / min.
10. The method according to claim 9, characterized in that In step (3), the process of removing floating color includes solid-liquid separation, soaping and drying.