A dyeing method for achieving red and black double-color effect on one side of fabric

Abstract

The present invention belongs to the field of textile technology and discloses a dyeing method for achieving a red and black dual-color effect on one side of a fabric. The dyeing method comprises the following steps: (1) soaking the fabric in a yam dye, taking it out, drying it in the sun for oxidation, and then mordant dyeing with ferrous salt to fix the color; (2) treating the fabric treated in step (1) with a calcium hydroxide aqueous solution to complete the dyeing operation. The dyeing method can achieve a black and red dual-color effect on one side of the fabric, avoids the use of artificial dyes, and has the advantage of being green and environmentally friendly. In addition, the fabric obtained by the dyeing method has good color fastness and is not prone to fading.

Description

Technical Field

[0001] The invention belongs to the field of textile technology, and in particular relates to a dyeing method for achieving a red and black two-color effect on one side of a fabric. Background Art

[0002] Dioscorea spp. is a natural plant dye. By coating mulberry silk fabric with its juice, then covering it with mineral-rich river and pond mud unique to the Pearl River Delta, and sun-drying it, Xiangyunsha, a costly gauze product, can be made. However, existing Xiangyunsha production processes can only achieve a jet-black finish on one side and a tea-brown finish on the other, not a dual-color black and red finish on the same side.

[0003] In addition, although there are methods that use a variety of artificial dyes of different properties to achieve a two-color effect on the surface of the fabric, such methods are highly polluting due to the use of artificial dyes. At the same time, they require the coordinated use of multiple artificial dyes, resulting in low dye utilization rates, and the color saturation and fastness of artificial dyes are generally poor.

[0004] Therefore, the present invention hopes to propose a dyeing method using yam as a dye to achieve a red and black double-color effect on one side of a fabric, thereby overcoming the defects and shortcomings of artificial dyes. Summary of the Invention

[0005] The present invention aims to address at least one of the technical problems existing in the aforementioned prior art. To this end, the present invention provides a dyeing method for achieving a red and black dual-color effect on one side of a fabric. This dyeing method can achieve a black and red dual-color effect on one side of the fabric while avoiding the use of artificial dyes, thus offering the advantage of being environmentally friendly. Furthermore, the resulting fabric exhibits excellent color fastness and is resistant to fading.

[0006] The present invention provides a dyeing method for achieving a red and black double-color effect on one side of a fabric, comprising the following steps:

[0007] (1) Soak the fabric in yam dye, take it out and dry it in the sun for oxidation, and then dye it with ferrous salt for color fixation;

[0008] (2) The fabric treated in step (1) is subjected to a calcium hydroxide aqueous solution to complete the dyeing operation.

[0009] In this dyeing method, the fabric is repeatedly soaked in a yam dye solution, air-dried and oxidized, and then mordanted with ferrous salts to achieve a completely jet-black finish. A calcium hydroxide solution is then used to generate a reddish-brown calcium tannate in areas of the fabric where the dye film is poorly formed or abraded, ultimately creating a single-sided red and black dual-color effect. Furthermore, compared to other natural plant dyes, this dyeing method is the only one that achieves a good red-black contrast and excellent color fastness.

[0010] Preferably, the preparation method of the Dioscorea scoparia dye in step (1) is as follows: the tubers of Dioscorea scoparia are crushed, water is added for extraction, and the filtrate is filtered to obtain the Dioscorea scoparia dye.

[0011] More preferably, the extraction is performed 1-5 times.

[0012] Preferably, the soaking and airing operations in step (1) are repeated until the weight gain of the fabric reaches 60%-75%. Through this operation, the yam dye can fully penetrate the fabric, thereby achieving a good subsequent dyeing effect.

[0013] More preferably, the number of repetitions is 8-20 times.

[0014] Preferably, the soaking time is no less than 20 minutes each time; the drying time is no less than 10 hours each time, and the temperature is no less than 20°C.

[0015] Preferably, the ferrous salt is selected from ferrous sulfate (FeSO4). If the ferrous salt is replaced by an inorganic salt, the contrast effect of the red and black colors cannot be formed.

[0016] Preferably, the amount of ferrous salt used in the mordanting and fixing in step (1) is 5%-10% of the mass of the fabric.

[0017] Preferably, the bath ratio (mass ratio of fabric to ferrous salt solution) during the mordanting and fixing in step (1) is 1:(15-25).

[0018] Preferably, the concentration of the calcium hydroxide (Ca(OH)2) aqueous solution in step (2) is 0.3-3 g / L.

[0019] Preferably, the time of the calcium peroxide aqueous solution in step (2) is controlled to be 30-60 seconds. If the time is too long, the overall color of the fabric will change to reddish brown, and the fabric will be a single color and will not achieve a two-color effect. If the time is too short, the color will remain black, and no reddish brown will appear. Therefore, by controlling the length of this step, a good black and red two-color effect can be achieved on the fabric.

[0020] Preferably, after the ferrous salt mordanting and fixation in step (1) and the calcium hydroxide aqueous solution in step (2), both are washed with clean water.

[0021] The present invention also provides a fabric with a red and black double-color effect on one side, and the fabric is made by adopting the dyeing method.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention uses the natural plant Dioscorea to achieve a red and black double-color effect on one side of the fabric with high color saturation, thereby increasing the added value of the textile and broadening the application range of the plant Dioscorea as a textile dye.

[0024] 2. Compared with the use of artificial dyes to achieve double-sided dyeing, the use of yam dye in the present invention has the advantages of being green, environmentally friendly, sustainable, and having a high dye utilization rate, and the resulting fabric has better color fastness. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the final dyeing effect diagram of the cotton and linen plain fabric in Example 1.

[0026] Figure 2 This is the final dyeing effect diagram of the silk and wool interwoven twill fabric in Example 1.

[0027] Figure 3 This is the final dyeing effect diagram of the linen and cotton interwoven plain fabric in Comparative Example 1.

[0028] Figure 4 This is the final dyeing effect diagram of the cotton and linen plain fabric in Comparative Example 2.

[0029] Figure 5 This is the final dyeing effect diagram of the cotton and linen plain fabric in Comparative Example 3. DETAILED DESCRIPTION

[0030] In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the following examples are given for illustration. It should be noted that the following examples are only preferred embodiments of the present invention and do not limit the scope of protection claimed by the present invention. Any modification, substitution, or combination made without violating the spirit and principle of the present invention is included in the scope of protection of the present invention.

[0031] Unless otherwise specified, the raw materials, reagents, or devices used in the following examples can be obtained from conventional commercial sources or by existing known methods.

[0032] Example 1

[0033] This embodiment provides a dyeing method for achieving a red and black two-color effect on one side of a fabric based on a yam dye (containing tannin and pectin), comprising the following steps:

[0034] Preparation of Dioscorea dye: Fresh Dioscorea stems were pulverized into a paste using a plant grinder. Deionized water was then added at a 1:1 mass ratio. The mixture was incubated at 40°C for 4 hours, filtered, and then re-extracted with an equal amount of deionized water. This was repeated three times. The three extracts were combined to obtain the Dioscorea dye.

[0035] 2. Two groups of fabrics: A. cotton and linen plain weave fabric; B. silk and wool twill fabric. Perform conventional desizing on each.

[0036] 3. Dyeing: Soak the fabric in the yam dye at room temperature until evenly soaked, squeeze dry, and dry in sunlight. Then soak in the yam dye again for 20 minutes. Repeat the soaking process several times. Heat the yam dye to 45°C for the third and seventh soaks. Air the fabric in the sun for 10 hours between each soak at a temperature above 20°C to allow the plant tannins and gums to fully oxidize and form a film. The fabric must be completely dry before the next soaking and drying cycle.

[0037] 4. Cotton and linen plain fabrics gain 74% weight after dyeing and airing 15 times, and silk and wool twill fabrics gain 67% weight after dyeing and airing 18 times. Stop dyeing and airing.

[0038] 5. Immerse the aired fabric in a ferrous sulfate solution for mordant dyeing. Use approximately 6% of the fabric weight (based on the weight of the untreated fabric) at a bath ratio of 1:20, at a temperature of 25°C, for 4 hours. Rinse with clean water to remove any loose color, leaving a pure black fabric.

[0039] 6. Add 0.5 g / L of slaked lime (calcium hydroxide) to tap water, stir, and clarify. Collect the upper layer of the clarified aqueous solution. Pass the fabric through this clarified limewater solution quickly (in this example, 50 seconds for cotton and linen plain weave fabric and 40 seconds for silk and wool twill fabric). Then, wash, dehydrate, and dry to produce a fabric with a single-sided red and black two-tone effect.

[0040] Figure 1 Shown is the final dyeing effect of cotton and linen plain fabric. Figure 2 Shown is the final dyeing effect of the silk and wool twill fabric.

[0041] Comparative Example 1

[0042] This comparative example provides a method for dyeing fabrics using a Quercus acutissima shell dye (containing tannin), comprising the following steps:

[0043] 1. Dye preparation: Place 100 g of Quercus acutissima shell in a solvent (soft water) with a pH value of 7, extract at 90° C. for 60 minutes, and filter to obtain the Quercus acutissima shell dye.

[0044] 2. Select linen and cotton interwoven plain fabric and carry out conventional desizing treatment.

[0045] 3. Place the linen-cotton plain weave fabric in the aforementioned oak shell extract. Remove the fabric and immerse it in an aqueous solution of ferrous sulfate for mordanting and fixation. Use approximately 5% of the fabric weight, with a bath ratio of 1:30. Fix the fabric at room temperature for 30 minutes, then re-immerse it in the original dye solution at 80°C for 20 minutes. Rinse with clean water to remove any loose color, resulting in a pure black fabric.

[0046] 4. Add 0.5g / L of slaked lime (calcium hydroxide) to tap water, stir, and clarify. Collect the upper layer of clarified water. Pass the fabric through this clarified limewater solution quickly for 30 seconds. Then, rinse, dehydrate, and dry to complete the dyeing process.

[0047] Figure 3 Shown is the final dyeing effect of the linen and cotton plain weave fabric. It can be seen that the fabric has no obvious two-tone effect.

[0048] Comparative Example 2

[0049] This comparative example provides a fabric dyeing method based on biwen dye and reactive dye, comprising the following steps:

[0050] 1. Select cotton and linen plain fabrics and perform conventional desizing treatment.

[0051] 2. Modify the fabric. Process parameters: temperature 60°C, pH 9, bath ratio 1:30, modifier (Tiansheng Chemical cation converter TS-TCM) dosage 4% (owf); after 30 minutes of treatment, rinse twice with cold water.

[0052] 3. Dye the modified fabric. Process parameters: temperature 70°C, bath ratio 1:30, 6% (owf) Nano Black 8503 (Biwen dye, purchased from Dongguan Tiansheng Chemical), treatment time 30 minutes. Rinse twice with clean water, solidify with 40°C warm water, dehydrate, and dry at 80°C.

[0053] 4. Perform conventional reactive dyeing on the Biwen-dyed fabric. Process parameters: Use a medium-temperature reactive dye, environmentally friendly Reactive Red (purchased from Shanghai Wonder Chemical, model number: 6BF), at 65°C for 40 minutes. Then rinse, dehydrate, and dry to complete the dyeing process.

[0054] Figure 4 The final dyeing result of the cotton and linen plain fabric is shown. It can be seen that although it has two-color contrast, the color transition is blurred.

[0055] Comparative Example 3

[0056] This comparative example provides a fabric dyeing method based on persimmon lacquer dye (containing tannin and gum), comprising the following steps:

[0057] 1. Use fresh, unripe persimmons, crush them into a paste, squeeze and filter the juice to obtain persimmon juice. Add deionized water at a mass ratio of 1:2 (1 part persimmon juice to 2 parts water) to obtain the persimmon lacquer dye solution.

[0058] 2. Select cotton and linen plain fabrics and perform conventional desizing treatment.

[0059] 3. Soak the plain cotton and linen fabric in the persimmon lacquer dye at room temperature until evenly soaked, squeeze dry, and dry in natural sunlight. Soak again for 20 minutes, for a total of 13 soaks, until the fabric gains 68% weight. Air the fabric in the sun for 10 hours between each soak at a temperature above 20°C to allow the plant tannins and gums to fully oxidize and form a film. The fabric must be completely dry before the next soaking and drying cycle.

[0060] 4. Immerse the aired fabric in a ferrous sulfate solution for mordant dyeing. Use approximately 6% of the fabric weight (based on the weight of the untreated fabric) at a bath ratio of 1:20, at a temperature of 25°C, for 4 hours. Rinse with clean water to remove any loose color, leaving a pure black fabric.

[0061] 6. Add 0.5g / L of slaked lime (calcium hydroxide) to tap water, stir, and clarify. Take the upper clarified aqueous solution. Quickly pass this clarified limewater through the fabric, in this embodiment, cotton and linen plain fabric for 120 seconds (the degree of persimmon lacquer conjunctiva formation is higher, and the shorter time does not change anything). Then, wash, dehydrate, and dry to complete the dyeing operation.

[0062] Figure 5 Shown is the final dyeing result of cotton and linen plain fabric. It can be seen that its dyeing effect is close to black and white.

[0063] Product effect testing

[0064] Color fastness test

[0065] The fabrics prepared in Example 1 and Comparative Examples 1-3 were subjected to the following tests. The test results are shown in Table 1.

[0066] 1. Soap washing test method: refer to ISO105-E01 standard;

[0067] 2. Water fastness test method: refer to ISO105-E01 standard;

[0068] 3. Alkali sweat test method: refer to ISO105-E01 standard;

[0069] 4. Acid sweat test method: refer to ISO105-E01 standard;

[0070] 5. Sunlight test method: Refer to ISO105-B02 standard (correlated color temperature: 5500K-6500K);

[0071] 6. Rubbing fastness test: refer to ISO105-D02 standard.

[0072] Table 1 Color fastness test results

[0073]

[0074]

[0075] As shown in Table 1, only Example 1 achieves a red-and-black dual-color effect on one side of the fabric, high color saturation, and excellent color fastness. Comparative Examples 1 and 3, while also using natural plant dyes containing tannin (Quercus acutissima shell dye and Persimmon lacquer dye), fail to achieve a dual-color effect or only produce an effect close to black and white, limiting their practical application value. Furthermore, the color fastness of the fabrics obtained in Comparative Examples 1 and 3 is inferior to that of Example 1. Comparative Example 2, while using artificial dyeing to dye the fabric, produces a dual-color contrast effect, but the color transition is blurred and the effect is poor. The color fastness of the fabric obtained in Comparative Example 2 also suffers from defects.

[0076] While the embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to the embodiments described above. Various modifications may be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof may be combined with one another unless there is a conflict.

Claims

1. A dyeing method for achieving a red and black double-color effect on one side of a fabric, characterized in that: The following steps are involved: (1) The fabric was soaked in yam dye at room temperature, taken out and dried for oxidation, and then fixed with ferrous salt mordant at 25°C for 4 hours; Repeat the soaking and drying operations in step (1) until the weight gain of the fabric reaches 60%-75%; (2) treating the fabric treated in step (1) with a calcium hydroxide aqueous solution to complete the dyeing operation; The time of the calcium perhydroxide aqueous solution in step (2) is controlled to be 30-60s.

2. The dyeing method according to claim 1, wherein The preparation method of the yamsonia dye in step (1) is as follows: the tubers of yamsonia are crushed, water is added for extraction, and the filtrate is filtered to obtain the yamsonia dye.

3. The dyeing method according to claim 1, wherein The soaking time is no less than 20 minutes each time; the drying time is no less than 10 hours each time, and the temperature is no less than 20°C.

4. The dyeing method according to claim 1, wherein The ferrous salt is selected from ferrous sulfate.

5. The dyeing method according to claim 1, wherein The amount of ferrous salt used in the mordanting and fixing step (1) is 5%-10% of the mass of the fabric.

6. The dyeing method according to claim 1, wherein The concentration of the calcium hydroxide aqueous solution in step (2) is 0.3-3 g / L.

7. The dyeing method according to claim 1, wherein After the color fixing by ferrous salt mordanting in step (1) and the calcium hydroxide aqueous solution in step (2), both are washed with clean water.

8. A fabric with a red and black double-color effect on one side, characterized in that: The fabric is made by the dyeing method according to any one of claims 1 to 7.

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