Colored cloth and preparation method thereof

Abstract

The invention provides colored cloth and a preparation method thereof, and belongs to the technical field of textile treatment. The preparation method of the colored cloth comprises the following steps: (1) mixing plant biomass with an aqueous solution of ethanol, and then sequentially dipping, centrifuging and concentrating to obtain dye liquor; the concentration of the aqueous solution of ethanol is 50-99.7 wt%; the mass ratio of the plant biomass to the aqueous solution of ethanol is (1-10): 1000; and (2) carrying out dip dyeing or spot dyeing on the cloth by adopting the dye liquor obtained in the step (1), and then cooking to obtain the colored cloth. The colored cloth obtained by the preparation method provided by the invention is bright in color, uniform in color distribution and not easy to fade.

Description

Technical Field

[0001] The invention relates to the technical field of textile processing, in particular to a colored cloth and a preparation method thereof. Background Art

[0002] There are many kinds of dyes used for dyeing cloth, mainly natural dyes and synthetic dyes. Traditional natural dyes have the problems of low color yield, long dyeing time, and low color fastness. Therefore, most natural dyes need to use mordants to fix the color and improve the dyeing effect during dyeing. Most traditional mordants (alum, potassium dichromate, stannous chloride, etc.) contain heavy metal ions, and many are even highly toxic. Many of them are included in the list of banned ecological textiles.

[0003] Therefore, providing a colored cloth which does not use a mordant and has bright colors, uniform color distribution, and is not easy to fade has become a technical problem to be solved urgently in the field. Summary of the invention

[0004] The purpose of the present invention is to provide a colored cloth and a preparation method thereof. The colored cloth prepared by the preparation method provided by the present invention has bright colors, uniform color distribution, and is not easy to fade.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a method for preparing colored cloth, comprising the following steps:

[0007] (1) mixing plant biomass with an aqueous solution of ethanol, and then immersing, centrifuging and concentrating in sequence to obtain a dye solution; the concentration of the aqueous solution of ethanol is 50 to 99.7 wt %; the mass ratio of the plant biomass to the aqueous solution of ethanol is (1 to 10): 1000;

[0008] (2) Using the dyeing solution obtained in step (1) to perform immersion dyeing or spot dyeing on the cloth, and then steaming the cloth to obtain colored cloth.

[0009] Preferably, the plant biomass in step (1) comprises wood powder, leaves or flowers of redwood plants.

[0010] Preferably, the immersion time in step (1) is 10 minutes to 24 hours.

[0011] Preferably, when the plant biomass is wood powder of redwood plants, ultrasonic treatment is also performed during the impregnation process.

[0012] Preferably, the power of the ultrasonic treatment is 400-2000W.

[0013] Preferably, in the step (1), the centrifugation speed is 5000 - 8000 r / min, and the centrifugation time is 5 - 10 min.

[0014] Preferably, in the step (1), the concentration of the pigment in the dye solution is 1 - 20 wt%.

[0015] Preferably, the fabric in the step (2) includes cotton cloth, linen cloth or silk.

[0016] Preferably, in the step (2), the steaming temperature is 30 - 90 °C, and the steaming time is 5 - 60 min.

[0017] The present invention also provides a colored fabric prepared by the preparation method described in the above technical solution.

[0018] The present invention provides a method for preparing a colored fabric, comprising the following steps: (1) mixing plant biomass with an aqueous solution of ethanol, followed by impregnation, centrifugation and concentration in sequence to obtain a dye solution; the concentration of the aqueous solution of ethanol is 50 - 99.7 wt%; the mass ratio of the plant biomass to the aqueous solution of ethanol is (1 - 10):1000; (2) impregnating or spot-dyeing the fabric with the dye solution obtained in the step (1), and then steaming to obtain a colored fabric. The present invention extracts the pigment in the plant biomass with an aqueous solution of ethanol. By adjusting the concentration and addition amount of ethanol, pigments such as fats, terpenoids, flavonoids and porphyrins can be obtained, and thus can better form stable chemical bonds with the fibers in the fabric, improving the color fixation effect after dyeing; and ethanol can improve the dye uptake rate of the pigment, and can also change the adsorption behavior of the dye solution on the surface of the fabric fibers, enabling more dyes to be effectively transferred to the fabric fibers, improving the utilization rate of the dye solution, and due to the presence of ethanol, hydrolysis reaction can be reduced and the color fastness can be improved; through steaming, chemical reactions can further occur between the dye molecules and the fibers of the fabric, improving the color fastness of the fabric. The results of the examples show that the preparation method provided by the present invention does not use a mordant, does not cause environmental pollution, the dye solution is extracted from natural plant biomass, is naturally green, the prepared colored fabric can reduce the potential risks to human health, and the fabric has bright colors, uniform color distribution and is not easy to fade. Description of the Drawings

[0019] Figure 1 It is a digital photo of the undyed cotton cloth in Example 1 of the present invention;

[0020] Figure 2 It is a digital photo of the colored fabric obtained in Example 1 of the present invention. Detailed Embodiments

[0021] The present invention provides a method for preparing a colored fabric, comprising the following steps:

[0022] (1) Mix the plant biomass with an aqueous solution of ethanol, and then successively carry out impregnation, centrifugation and concentration to obtain a dye solution;

[0023] (2) Use the dye solution obtained in the above step (1) to impregnate and dye or spot-dye the fabric, and then carry out steaming to obtain a colored fabric.

[0024] In the present invention, the plant biomass is mixed with an aqueous solution of ethanol, and then successively carried out impregnation, centrifugation and concentration to obtain a dye solution.

[0025] As an embodiment of the present invention, the plant biomass may include wood powder, leaves or flowers of redwood plants; the wood powder of redwood plants may include wood powder of Dalbergia cochinchinensis or Dalbergia cearensis; the flower is a colored flower. In the embodiments of the present invention, the flower may be the petals of a rose. The present invention limits the types of plant biomass to the above range to extract pigments from the plant biomass.

[0026] As an embodiment of the present invention, the plant biomass can be washed before use. The present invention has no special limitation on the operation of the washing, and it is only necessary to wash the biomass raw material clean.

[0027] As an embodiment of the present invention, the concentration of the aqueous solution of ethanol may be 50-99.7 wt%, or 60-90 wt%, or 70-80 wt%, or 75 wt%. In the present invention, different concentrations of the aqueous solution of ethanol have different dissolution abilities for the target components. Concentrations lower than 50 wt% are incompletely extracted, and concentrations higher than 99.7 wt% may damage the structure of the extract and make it lose its original biological activity. The present invention limits the concentration of the aqueous solution of ethanol to the above range to better extract the pigments in the plant biomass.

[0028] As an embodiment of the present invention, the mass ratio of the plant biomass to the aqueous solution of ethanol may be (1-10):1000, or (3-10):1000, or (5-10):1000, or (8-10):1000. In the present invention, a mass ratio of the plant biomass to the aqueous solution of ethanol lower than 1:1000 will result in incomplete extraction of the pigments in the plant biomass, and a mass ratio higher than 10:1000 will cause waste of raw materials. The present invention limits the mass ratio of the plant biomass to the aqueous solution of ethanol to the above range to better extract the pigments in the plant biomass.

[0029] The present invention has no special limitation on the operation and time of the mixing, and it is only necessary to mix the plant biomass and the aqueous solution of ethanol evenly.

[0030] As an embodiment of the present invention, the impregnation time can be 10 min to 24 h, or 30 min to 20 h, or 50 min to 18 h, or 2 to 18 h, or 5 to 10 h, or 6 to 8 h. By limiting the impregnation time within the above range, the present invention can fully extract the pigments in the biomass raw materials.

[0031] As an embodiment of the present invention, continuous ultrasonic treatment can also be accompanied during the impregnation process; the continuous ultrasonic treatment can be carried out in an ultrasonic crusher; the power of the continuous ultrasonic treatment can be 400 to 2000 W, or 800 to 1600 W, or 1200 to 1400 W. As an embodiment of the present invention, when continuous ultrasonic treatment is accompanied during the impregnation process, the impregnation time can be 10 to 50 min, or 20 to 40 min, or 25 to 30 min. In the examples of the present invention, when the plant biomass is the wood powder of redwood plants, continuous ultrasonic treatment is accompanied during the impregnation process. By accompanying ultrasonic treatment during the impregnation process and limiting the frequency and time of ultrasonic waves within the above range, the present invention can accelerate the extraction rate of pigments in plant biomass. When the plant biomass is the wood powder of redwood plants, the wood powder of redwood plants can be crushed to destroy the cells of the wood powder, and thus the pigments in the wood powder of redwood plants can be fully extracted.

[0032] As an embodiment of the present invention, the centrifugation can be carried out in a centrifuge; the rotation speed of the centrifugation can be 5000 to 8000 r / min, or 6000 to 7000 r / min, or 6500 r / min; the time of the centrifugation can be 5 to 10 min, or 6 to 9 min, or 7 to 8 min. By limiting the rotation speed and time of the centrifugation within the above range, the present invention can fully separate the plant biomass.

[0033] As an embodiment of the present invention, after the centrifugation is completed, the liquid obtained by the centrifugation can be concentrated.

[0034] As an embodiment of the present invention, the concentration method can be evaporation concentration by water bath heating, rotary evaporation concentration or nitrogen blowing concentration. Through concentration, the present invention can obtain a dye solution with a corresponding concentration.

[0035] As an embodiment of the present invention, the concentration of the pigment in the dye solution can be 1 to 20 wt%, or 2 to 18 wt%, or 5 to 15 wt%, or 8 to 12 wt%, or 9 to 10 wt%. By limiting the concentration of the pigment in the dye solution within the above range, the present invention can obtain dye solutions with different shades of color.

[0036] After obtaining the dye liquor, the present invention uses the dye liquor to impregnate and dye the fabric, and then performs steaming to obtain a colored fabric.

[0037] As an embodiment of the present invention, the fabric includes cotton cloth, linen cloth or silk. Limiting the types of fabrics to the above range in the present invention can better enable the dye liquor to perform dyeing.

[0038] As an embodiment of the present invention, the impregnation dyeing can be overall impregnation dyeing; the overall impregnation dyeing can be to completely immerse the fabric in the dye liquor for dyeing.

[0039] As an embodiment of the present invention, the spot dyeing can be to use a coloring pen to dip the dye liquor and dye the part that needs to be dyed.

[0040] As an embodiment of the present invention, the ratio of the volume of the dye liquor to the mass of the fabric in the impregnation dyeing can be 1:(8 - 12), or 1:(9 - 11), or 1:10. When the ratio of the dye liquor in the present invention is relatively low, it will cause insufficient and uneven contact between the dye liquor and the fabric, and the dye liquor circulation is not smooth, thereby affecting the uniformity of dyeing and easily producing color difference. Limiting the ratio of the volume of the dye liquor to the mass of the fabric in the impregnation dyeing to the above range in the present invention can obtain a colored fabric with uniform color.

[0041] As an embodiment of the present invention, the temperature of the steaming can be 30 - 90°C, or 50 - 80°C, or 60 - 70°C; the time of the steaming can be 5 - 60 min, or 10 - 50 min, or 20 - 40 min, or 25 - 35 min. Through steaming in the present invention, chemical reactions can further occur between the dye molecules and the fibers of the fabric, improving the color fastness of the fabric.

[0042] As an embodiment of the present invention, after the steaming, rinsing and drying can be sequentially performed to obtain a colored fabric.

[0043] As an embodiment of the present invention, the rinsing liquid used for rinsing can be clear water. The present invention has no special limitation on the rinsing time, and the rinsing time commonly used by those skilled in the art can be adopted. Through rinsing in the present invention, the residual color can be washed off.

[0044] As an embodiment of the present invention, the drying can be natural air drying. Through natural air drying in the present invention, a dry colored fabric is obtained.

[0045] The present invention uses an aqueous solution of ethanol to extract pigments from plant biomass. By adjusting the concentration and addition amount of ethanol, pigments such as fats, terpenes, flavonoids, and porphyrins can be obtained, and thus can better form stable chemical bonds with the fibers in the fabric, improving the color fixation effect after dyeing; moreover, ethanol can increase the dye uptake rate of the pigments, and can also change the adsorption behavior of the dye solution on the surface of the fabric fibers, enabling more dyes to be effectively transferred onto the fabric fibers, improving the utilization rate of the dye solution, and due to the presence of ethanol, hydrolysis reactions can be reduced and the color fixation degree can be increased; through steaming, chemical reactions can further occur between the dye molecules and the fibers of the fabric, improving the color fixation degree of the fabric; no mordant is used to avoid environmental pollution, the dye solution is extracted from natural plant biomass, is naturally green, and the prepared colored fabric can reduce the potential risks to human health.

[0046] The technical solutions in the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0047] Example 1

[0048] A method for preparing a colored fabric:

[0049] (1) Rosewood powder is mixed with an aqueous solution of ethanol (concentration 99.7 wt%) at a mass ratio of 10:1000, and then successively subjected to impregnation (impregnation time is 50 min, accompanied by continuous ultrasonic treatment during impregnation, ultrasonic power is 1200 W), centrifugation (centrifugation speed is 8000 r / min, centrifugation time is 10 min), and concentration to obtain a dye solution (pigment concentration in the dye solution is 6 wt%);

[0050] (2) The cotton fabric is impregnated and dyed with the dye solution obtained in step (1), then steamed at 60 °C for 20 min, and then rinsed with clear water, and after washing off the residual color, it is naturally dried to obtain a colored fabric; in the overall impregnation dyeing, the volume ratio of the dye solution to the mass of the cotton fabric is 1:10.

[0051] Example 2

[0052] The difference between Example 2 and Example 1 is only that the concentration of the aqueous solution of ethanol is 75 wt%, and the others are the same as in Example 1.

[0053] Example 3

[0054] The difference between Example 3 and Example 1 is only that the concentration of the aqueous solution of ethanol is 50 wt%, and the others are the same as in Example 1.

[0055] Example 4

[0056] The difference between Example 4 and Example 1 is only that the ultrasonic power is 800 W, and the others are the same as Example 1.

[0057] Example 5

[0058] The difference between Example 5 and Example 1 is only that the ultrasonic power is 400 W, and the others are the same as Example 1.

[0059] Example 6

[0060] The difference between Example 6 and Example 1 is only that the impregnation time is 30 min, and the others are the same as Example 1.

[0061] Example 7

[0062] The difference between Example 7 and Example 1 is only that the impregnation time is 10 min, and the others are the same as Example 1.

[0063] Example 8

[0064] The difference between Example 8 and Example 1 is only that the centrifugation speed is 7000 r / min, and the others are the same as Example 1.

[0065] Example 9

[0066] The difference between Example 9 and Example 1 is only that the centrifugation speed is 5000 r / min, and the others are the same as Example 1.

[0067] Example 10

[0068] The difference between Example 10 and Example 1 is only that the centrifugation time is 8 min, and the others are the same as Example 1.

[0069] Example 11

[0070] The difference between Example 11 and Example 1 is only that the centrifugation time is 5 min, and the others are the same as Example 1.

[0071] Example 12

[0072] The difference between Example 12 and Example 1 is only that the cooking time is 40 min, and the others are the same as Example 1.

[0073] Example 13

[0074] The difference between Example 13 and Example 1 is only that the cooking time is 60 min, and the others are the same as Example 1.

[0075] Example 14

[0076] A method for preparing a colored fabric:

[0077] (1) Mix the rose petals with an aqueous ethanol solution (concentration 99.7 wt%) in a mass ratio of 10:1000, and then carry out impregnation (the impregnation time is 6 h, and the impregnated roses are in a yellow state), centrifugation (the centrifugation speed is 8000 r / min, and the centrifugation time is 10 min), and concentration to obtain a dye solution (the pigment concentration in the dye solution is 6 wt%);

[0078] (2) Use the dye solution obtained in step (1) to impregnate and dye the cotton cloth, then cook it at 60 °C for 20 min, then rinse it with clear water, wash off the remaining color, and air dry it naturally to obtain a colored fabric; in the impregnation and dyeing, the volume ratio of the dye solution to the mass of the cotton cloth is 1:10.

[0079] Example 15

[0080] The difference between Example 15 and Example 14 is only that the concentration of the aqueous ethanol solution is 75 wt%, and the others are the same as Example 14.

[0081] Example 16

[0082] The difference between Example 16 and Example 14 is only that the concentration of the aqueous ethanol solution is 50 wt%, and the others are the same as Example 14.

[0083] Example 17

[0084] The difference between Example 17 and Example 14 is only that the centrifugation speed is 7000 r / min, and the others are the same as Example 14.

[0085] Example 18

[0086] The difference between Example 18 and Example 14 is only that the centrifugation speed is 5000 r / min, and the others are the same as Example 14.

[0087] Example 19

[0088] The difference between Example 19 and Example 14 is only that the centrifugation time is 8 min, and the others are the same as Example 14.

[0089] Example 20

[0090] The difference between Example 20 and Example 14 is only that the centrifugation time is 5 min, and the others are the same as Example 14.

[0091] Example 21

[0092] The difference between Example 21 and Example 14 is only that the cooking time is 40 min, and the others are the same as Example 14.

[0093] Example 22

[0094] Example 22 is only different from Example 14 in that the steaming time is 60 min, and the others are the same as Example 14.

[0095] The digital photo of the undyed cotton cloth in Example 1 is as Figure 1 shown, and the digital photo of the colored cloth obtained in Example 1 is as Figure 2 shown. It can be seen from Figure 1 and Figure 2 that the coloring of the cloth is uniform and the color is saturated.

[0096] The water fastness of the colored cloth (two batches of samples, namely Sample 1# and Sample 2#) obtained in Example 1 was detected by the national standard "Textiles - Tests for color fastness - Color fastness to water" (Standard No.: GB / T 5713 - 2013). The water fastness grades obtained are shown in Table 1. It can be seen from Table 1 that the water fastness grades of the colored cloth of the two samples can both reach Grade 4.

[0097] Table 1 Water fastness grade data of the colored cloth obtained in Example 1

[0098] sample Sample No. 1 Sample No. 2 Water fastness grade (color change rating) 4 4

[0099] The colored cloth obtained by the preparation method provided by the present invention has bright colors, uniform color distribution, is not easy to fade, and has good water fastness.

[0100] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A method for preparing a colored fabric, comprising the following steps: (1) Mix plant biomass with an aqueous ethanol solution, and then perform impregnation, centrifugation, and concentration in sequence to obtain a dye solution; the concentration of the aqueous ethanol solution is 50-99.7 wt%; the mass ratio of the plant biomass to the aqueous ethanol solution is (1-10):1000; (2) Use the dye solution obtained in step (1) to impregnate-dye or spot-dye the fabric, and then perform steaming to obtain a colored fabric.

2. The preparation method according to claim 1, characterized in that, In step (1), the plant biomass includes redwood plant wood powder, leaves, or flowers.

3. The preparation method according to claim 1, wherein In step (1), the impregnation time is 10 min to 24 h.

4. The preparation method according to claim 2, wherein When the plant biomass is redwood plant wood powder, ultrasonic treatment is also performed during the impregnation process.

5. The preparation method according to claim 4, characterized in that, The power of the ultrasonic treatment is 400-2000 W.

6. The preparation method according to claim 1, characterized in that, In step (1), the centrifugation speed is 5000-8000 r / min, and the centrifugation time is 5-10 min.

7. The preparation method according to claim 1, wherein, In step (1), the concentration of pigments in the dye solution is 1-20 wt%.

8. The preparation method according to claim 1, characterized in that, In step (2), the fabric includes cotton cloth, linen cloth, or silk.

9. The preparation method according to claim 1, wherein In step (2), the steaming temperature is 30-90 °C, and the steaming time is 5-60 min.

10. A colored fabric prepared by the preparation method according to any one of claims 1-9.

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