Continuous dyeing method of bio-based nylon 56, dyed fabric and application

Abstract

The invention relates to the technical field of dyeing processes, in particular to a continuous dyeing method of bio-based nylon 56, a dyed fabric and application, and the continuous dyeing method comprises the following steps: carrying out dipping treatment on the bio-based nylon 56 to be dyed by utilizing dye liquor containing dye, then putting the bio-based nylon 56 subjected to dipping treatment into a color fixing medium for color fixing treatment; by adopting the method provided by the invention, the continuous dyeing of the bio-based nylon 56 can be realized, and a very good coloring effect, namely a relatively high K / S value, is ensured to be kept in the continuous dyeing process. In addition, compared with the traditional acid dye dyeing, the continuous dyeing method provided by the invention has the advantage that the color fastness to rubbing is obviously improved.

Description

Technical Field

[0001] The present invention relates to the technical field of dyeing processes, and particularly to a continuous dyeing method for bio-based nylon 56, dyed fabrics, and applications. Background Art

[0002] Nylon (PA, also known as polyamide) is a synthetic fiber with several amide repeating units in its molecular structure. Due to its excellent comprehensive properties, it has developed rapidly in different fields. Currently, the main nylon products in China are PA6 and PA66, accounting for more than 90% of the total polyamide production. The production raw materials of traditional nylon are mainly extracted from petroleum. Due to the increasing demand for nylon materials in industrial production, there is a huge contradiction with the increasing shortage of petrochemical resources. Coupled with the increasingly severe environmental protection issues, the petrochemical source of nylon production raw materials severely restricts the development of nylon.

[0003] Bio-based nylon 56 (also known as bio-based polyamide 56; bio-PA56) is a green and renewable environmentally friendly bio-based material formed by the polycondensation of 1,5-pentanediamine (DN5) and adipic acid. It has good comprehensive properties, with advantages such as high strength, wear resistance, heat resistance, self-lubrication, oil resistance, high bulkiness, and better flame retardancy than existing PA6 and PA66. In addition, the production raw material 1,5-pentanediamine of bio-based nylon 56 can be obtained by converting biomass resources through bio-fermentation engineering. Since the bio-based monomers partially replace the petroleum-based monomers, it conforms to the development trend of the green and low-carbon industry. With obvious advantages in technology localization and environmental protection, bio-based nylon 56 is expected to replace existing PA66 in the future.

[0004] In the prior art, nylon fibers can be dyed with acid dyes, disperse dyes, neutral dyes, reactive dyes, or vat dyes. The research on the dyeing of bio-based nylon 56 focuses on dip dyeing, and more research is on dyeing with acid dyes. However, when dyeing with acid dyes, there are problems such as poor rubbing fastness of the dyed fabrics and heavy metal pollution caused by some acid dyes. In addition, traditional water bath dyeing has problems of high water consumption and serious pollution. Moreover, there are few reports on the continuous dyeing of bio-based nylon 56 in the prior art. Summary of the Invention

[0005] The purpose of the present invention is to solve at least one of the above technical problems in the prior art to a certain extent.

[0006] To achieve the above purpose, the present invention provides a continuous dyeing method for bio-based nylon 56, which includes impregnating the bio-based nylon 56 to be dyed with a dye-containing dye liquor, and then putting the impregnated bio-based nylon 56 into a fixing medium for fixing treatment.

[0007] Preferably, the dye is a reactive dye.

[0008] Preferably, the pH value of the dyeing solution is 3.0 - 13.0, and the mass concentration of the dye in the dyeing solution is 20.0 - 80.0 g / L.

[0009] Preferably, the pH value of the dyeing solution is 12, and the mass concentration of the dye in the dyeing solution is 20 g / L.

[0010] Preferably, after the impregnation treatment, the liquor ratio of the bio - based nylon 56 is 20 - 80%; preferably 20%.

[0011] Preferably, the fixing medium is selected from one or more of decamethylcyclopentasiloxane, liquid paraffin, and absolute ethanol.

[0012] Preferably, the conditions for the fixing treatment include: the fixing temperature is 70 - 95 °C, and the fixing time is 0.5 - 3 min.

[0013] Preferably, the fixing temperature is 70 °C, and the fixing time is 1.5 min.

[0014] Preferably, the continuous dyeing method further includes steps of soaping and washing and drying the bio - based nylon 56 after the fixing treatment.

[0015] Preferably, the conditions for the soaping include: soaping treatment at a temperature of 90 - 95 °C for 10 - 20 min.

[0016] The present invention also provides a dyed fabric obtained by treating according to the above - mentioned continuous dyeing method.

[0017] The present invention also provides an application of the above - mentioned dyed fabric in the textile and clothing fields.

[0018] In the present invention, by adopting the method provided by the present invention, the continuous dyeing of bio - based nylon 56 can be realized, and a good coloring effect, that is, a relatively high K / S value, can be ensured during the continuous dyeing process. In addition, in terms of the rubbing fastness performance, the continuous dyeing method provided by the present invention has a significant improvement compared with the traditional acid dyeing. Brief Description of the Drawings

[0019] Figure 1 is a flow chart of a continuous dyeing method for bio - based nylon 56 provided by the present invention;

[0020] Figure 2 is the K / S value of the dyed fabric obtained by dyeing PA56 fabric with Reactive Blue 19 at different fixing times in Example 1;

[0021] Figure 3is the K / S value of the dyed PA56 fabric obtained by dyeing with Reactive Red 278 in Example 2 at different fixation times;

[0022] Figure 4 is the K / S value of the dyed PA56 fabric obtained by dyeing with Reactive Blue 19 in Example 3 at different fixation temperatures;

[0023] Figure 5 is the K / S value of the dyed PA56 fabric obtained by dyeing with Reactive Red 278 in Example 4 at different fixation temperatures;

[0024] Figure 6 is the K / S value of the dyed PA56 fabric obtained by dyeing with Reactive Blue 19 in Example 5 at different dye liquor pH values;

[0025] Figure 7 is the K / S value of the dyed PA56 fabric obtained by dyeing with Reactive Red 278 in Example 6 at different dye liquor pH values;

[0026] Figure 8 is the K / S value of the dyed PA56 fabric obtained by dyeing with Reactive Blue 19 in Example 7 at different fabric liquor pickup rates;

[0027] Figure 9 is the K / S value of the dyed PA56 fabric obtained by dyeing with Reactive Red 278 in Example 8 at different fabric liquor pickup rates;

[0028] Figure 10 is the K / S value and fixation rate of the dyed PA56 fabric obtained by dyeing with Reactive Blue 19 in Example 9 at different dye mass concentrations;

[0029] Figure 11 is the K / S value and fixation rate of the dyed PA56 fabric obtained by dyeing with Reactive Red 278 in Example 10 at different dye mass concentrations. Specific Embodiments

[0030] The following further elaborates on the specific embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.

[0031] As previously mentioned, in combination with Figure 1 shown, the present invention provides a continuous dyeing method for bio-based nylon 56, comprising:

[0032] S1: Immersing the bio-based nylon 56 to be dyed in a dye liquor containing dyes;

[0033] S2: Placing the bio-based nylon 56 after immersion treatment into a fixation medium for fixation treatment.

[0034] The inventors of the present application have found that by adopting the method provided by the present invention, continuous dyeing of bio-based nylon 56 can be achieved, and good coloring effect can be ensured during continuous dyeing, that is, having a relatively high K / S value. In addition, in terms of the rubbing fastness performance, the continuous dyeing method provided by the present invention has a significant improvement compared with the traditional acid dyeing.

[0035] According to the continuous dyeing method provided by the present invention, in order to improve the fastness of bio-based nylon 56 after dyeing treatment, the dye is preferably a reactive dye. It should be noted that reactive dyes are a type of dye that can form covalent bonds with fiber molecules. They combine with the functional groups of the fiber (such as hydroxyl groups, amino groups) through chemical reactions (such as nucleophilic substitution or addition reactions). This chemical bonding gives them excellent fastness, especially outstanding in terms of wash fastness and rubbing fastness. In the present invention, reactive dyes have many advantages compared with traditional dyes. Specifically, since bio-based nylon 56 is a polyamide fiber formed by the polycondensation of 1,5-pentanediamine (DN5) and adipic acid, its molecular chain contains amino groups (-NH2) and carboxyl groups (-COOH), which provide effective reaction sites for reactive dyes. When dyeing bio-based nylon 56, the reactive groups in the reactive dyes can form stable covalent bonds with bio-based nylon 56, thus significantly improving the fastness, far exceeding that of traditional acid dyes. In addition, compared with traditional acid dyes that require a mordant (such as sodium sulfate) to promote dyeing, only adjusting the pH of the dye solution is needed when using reactive dyes. Moreover, using reactive dyes can complete dyeing under low-temperature conditions, which has an obvious energy consumption advantage compared with traditional acid dyes and can also overcome the drawback that bio-based nylon 56 is sensitive to high temperatures.

[0036] In the present invention, the pH value of the dye solution is 3.0 - 13.0, and the mass concentration of the dye in the dye solution is 20.0 - 80.0 g / L; further, the inventors of the present application have found that by controlling the pH value of the dye solution to 12 and controlling the mass concentration of the dye in the dye solution to 20 g / L, the coloring effect of the dye on bio-based nylon 56 can be effectively ensured while controlling the cost.

[0037] In the present invention, the pH value of the dye liquor can be controlled in any suitable form, and those skilled in the art can make appropriate selections according to the target pH value. For example, when adjusting the acidity, acidic substances such as acetic acid can be added to the dye liquor, and when adjusting the alkalinity, alkaline substances such as sodium bicarbonate or sodium carbonate can be added to the dye liquor. It should be noted that through precise control of the dye content and pH, the fixation rate and color fastness of the reactive dye can be maximized, while reducing the risk of fiber damage. During the continuous dyeing process of the present invention, an on-line pH monitoring device can be combined to realize real-time monitoring and adjustment of the pH value of the dye liquor, thereby ensuring the stability of the continuous dyeing process. It can be understood that in the present invention, after the impregnation treatment, controlling the liquor pickup rate of the bio-based nylon 56 is a key link to optimize the process, improve the dyeing quality and reduce costs. After the impregnation treatment in the present invention, the liquor pickup rate of the bio-based nylon 56 is 20-80%; preferably 20%.

[0038] In the present invention, the fixation medium is selected from one or more of decamethylcyclopentasiloxane, liquid paraffin, and absolute ethanol.

[0039] In the present invention, the conditions for the fixation treatment include: the fixation temperature is 70-95°C, and the fixation time is 0.5-3 min; preferably, the fixation temperature is 70°C and the fixation time is 1.5 min.

[0040] In the present invention, the continuous dyeing method further includes the steps of soaping and washing and drying the bio-based nylon 56 after the fixation treatment. In the present invention, the conditions for the soaping include: soaping treatment at a temperature of 90-95°C for 10-20 min.

[0041] The following further illustrates the continuous dyeing method provided by the present invention through specific examples.

[0042] The continuous dyeing method provided by the embodiment of the present invention detects various performances through the following methods.

[0043] 1. Test of K / S value

[0044] Using a Datacolor 800 spectrophotometer, under a D65 light source, with a 10° standard observer, measure three different positions of the sample in the spectral range of 380-720 nm to obtain the average value of the K / S value, so as to evaluate the dyeing build-up.

[0045] The K / S value of the dyed fabric refers to the ratio of the absorption coefficient K to the scattering coefficient S calculated by the Kubelka-Munk equation, which is used to evaluate the color depth of the dyed fabric. The larger the K / S value, the darker the color of the fabric; conversely, the smaller the K / S value, the lighter the color.

[0046] 2. Fixation rate test

[0047] The dye fixation rate was determined using formula (1).

[0048]

[0049] In the formula, A 0 is the absorbance of the initial dye solution, and A 1 is the absorbance of the soaping residue solution, n 0 is the dilution factor of the initial dye solution, and n 1 is the absorbance of the soaping residue solution, where the absorbance was measured using a UV-visible spectrophotometer UV-2600.

[0050] 3. Color fastness to soaping

[0051] The color fastness to soaping of the dyed sample was determined according to the method of GB / T 3921-2008 "Textiles - Tests for color fastness - Color fastness to soaping". The textile specimen was sewn together with two specified standard adjacent fabrics and placed in a mixed solution containing 5 g / L of soap flakes and 2 g / L of Na 2 CO 3 . It was mechanically agitated at 60 °C for 30 min, then washed and dried. Using the original sample as the reference sample, the color change of the specimen and the staining of the adjacent fabric were evaluated with a gray scale or an instrument.

[0052] 4. Color fastness to rubbing

[0053] The color fastness to rubbing of the dyed sample was determined according to the method of GB / T 3920-2008 "Textiles - Tests for color fastness - Color fastness to rubbing". The test was carried out using a YS71 type dyeing and rubbing color fastness tester produced by Laizhou Yuanmao Instrument Co., Ltd.

[0054] Sources of raw materials used in the examples and comparative examples of the present invention:

[0055] PA56 fabric: 100% bio-based PA56, gram weight: 43 gsm, specification: 20D*20D, purchased from Suzhou Zhongliang Textile Technology Co., Ltd.;

[0056] Decamethylcyclopentasiloxane, CAS No. 541-02-6, purity ≥ 98.0%, purchased commercially;

[0057] Cedren blue N-S, Cedren red N-S: belong to acid dyes, purchased from Jinhua Shuanghong Chemical Industry Co., Ltd.;

[0058] Reactive blue 19, reactive red 278: belong to reactive dyes (filter cake), purchased from Haining Lvyu Textile Technology Co., Ltd. The structural formula of reactive blue 19 is as shown in formula Ⅰ below, and the structural formula of reactive red 278 is as shown in formula Ⅱ below:

[0059]

[0060] Example 1

[0061] This example provides a continuous dyeing method for bio - based nylon 56, and the specific steps are as follows:

[0062] (1) Prepare an active blue 19 dye solution with a mass concentration of 20 g / L and a pH value of 12. Take 6 groups of PA56 fabrics (0.5 g for each group) and immerse them in the above - mentioned active blue 19 dye solution for 30 s respectively;

[0063] (2) Use a vertical padding - mangle to evenly roll the dye solution on the above - mentioned PA56 fabrics, and at the same time control the liquor - pick - up rate of the fabrics to be 20%;

[0064] (3) Put the 6 groups of padded PA56 fabrics into a fixing medium (decamethylcyclopentasiloxane) at 70 °C, and control the fixing treatment time to be 0.5 min, 1.0 min, 1.5 min, 2.0 min, 2.5 min, and 3.0 min respectively. Take them out after the fixing is completed;

[0065] (4) Perform soaping treatment on the fixed PA56 fabrics at 90 °C for 10 min, and then perform drying treatment to obtain dyed fabrics, and test their K / S values. The test results are as Figure 2 shown.

[0066] Example 2

[0067] The continuous dyeing method of bio - based nylon 56 in this example is basically the same as that in Example 1. The difference is that in this example, the dye solution is prepared with active red 278; the test results of the K / S values of the dyed fabrics are as Figure 3 shown.

[0068] Combined Figure 2 and Figure 3 shown, when using active blue 19 and active red 278 to dye the PA56 fabrics respectively, when the fixing time is relatively short, the K / S value increases with the extension of the fixing time. When the fixing time reaches 1.5 min, the K / S value tends to be stable. At this time, if the fixing time is continued to be extended, the K / S value remains unchanged.

[0069] Example 3

[0070] This example provides a continuous dyeing method for bio - based nylon 56, and the specific steps are as follows:

[0071] (1) Prepare an active blue 19 dye solution with a mass concentration of 20 g / L and a pH value of 12. Take 6 groups of PA56 fabrics (0.5 g for each group) and immerse them in the above - mentioned active blue 19 dye solution for 30 s respectively;

[0072] (2) Use a vertical padding machine to evenly pad the dye liquor on the above-mentioned PA56 fabric, and at the same time control the liquor pickup rate of the fabric to be 20%;

[0073] (3) Prepare fixing media (decamethylcyclopentasiloxane) at temperatures of 70°C, 75°C, 80°C, 85°C, 90°C, and 95°C respectively. Immerse the 6 groups of padded PA56 fabrics into the fixing media at the above different temperatures for fixing treatment, and take them out after 1.5 minutes of fixing treatment;

[0074] (4) Scour the fixed PA56 fabric at 90°C for 10 minutes, and then perform drying treatment to obtain the dyed fabric, and test its K / S value. The test results are as Figure 4 shown.

[0075] Example 4

[0076] This example is basically the same as the continuous dyeing method of bio-based nylon 56 in Example 3. The difference is that in this example, the dye liquor is prepared with reactive red 278; the test results of the K / S value of the dyed fabric are as Figure 5 shown.

[0077] Combined Figure 4 and Figure 5 shown, when using reactive blue 19 and reactive red 278 to dye the PA56 fabric respectively, as the fixing temperature increases, the K / S value of the dyed fabric generally shows an upward trend, but the influence of the fixing temperature on the K / S value is not obvious. For example, when the fixing temperature is increased from 70°C to 95°C, the increase in the K / S value is less than 0.5.

[0078] Example 5

[0079] This example provides a continuous dyeing method for bio-based nylon 56, and the specific steps are as follows:

[0080] (1) Prepare reactive blue 19 dye liquor with a mass concentration of 20 g / L and pH values of 3, 4, 5.5, 6, 7, 9, 10, 11, 12, and 13 respectively; Take 10 groups of PA56 fabrics (0.5 g per group) and immerse them into the reactive blue 19 dye liquor with the above pH values for 30 s one by one;

[0081] (2) Use a vertical padding machine to evenly pad the dye liquor on the above-mentioned PA56 fabric, and at the same time control the liquor pickup rate of the fabric to be 20%;

[0082] (3) Immerse the padded PA56 fabric into the fixing medium (decamethylcyclopentasiloxane) at 70°C, and take it out after 1.5 minutes of fixing treatment;

[0083] (4) The PA56 fabric after fixation is soaped at 90 °C for 10 min, and then dried to obtain the dyed fabric. Its K / S value is measured, and the measurement results are as Figure 6 shown.

[0084] Example 6

[0085] The continuous dyeing method of bio-based nylon 56 in this example is basically the same as that in Example 5. The difference is that in this example, the dye liquor is prepared with reactive red 278; the measurement results of the K / S value of the dyed fabric are as Figure 7 shown.

[0086] Combined with Figure 6 and Figure 7 shown, when the PA56 fabric is dyed with reactive blue 19 and reactive red 278 respectively, the K / S value of the dyed fabric shows a trend of first decreasing, then increasing and then decreasing with the increase of the pH value; when the pH value of the dye liquor is 12, the K / S value of the dyed fabric is the largest.

[0087] Example 7

[0088] This example provides a continuous dyeing method for bio-based nylon 56. The specific steps are as follows:

[0089] (1) Prepare a reactive blue 19 dye liquor with a mass concentration of 20 g / L and a pH value of 12. Take 5 groups of PA56 fabrics (0.5 g each group) and immerse them in the above reactive blue 19 dye liquor for 30 s respectively;

[0090] (2) Use a vertical padding mangle to pad the dye liquor on the above PA56 fabrics evenly, and at the same time control the liquor pickup rates of the 5 groups of PA56 fabrics to be 20%, 30%, 40%, 60%, and 80% respectively;

[0091] (3) Put the padded PA56 fabrics into a fixing medium (decamethylcyclopentasiloxane) at 70 °C, take them out after fixing for 1.5 min;

[0092] (4) The PA56 fabric after fixation is soaped at 90 °C for 10 min, and then dried to obtain the dyed fabric. Its K / S value is measured, and the measurement results are as Figure 8 shown.

[0093] Example 8

[0094] The continuous dyeing method of bio-based nylon 56 in this example is basically the same as that in Example 7. The difference is that in this example, the dye liquor is prepared with reactive red 278; the measurement results of the K / S value of the dyed fabric are as Figure 9 shown.

[0095] Combined with Figure 8and Figure 9 As shown in Figure 9 , when using reactive blue 19 and reactive red 278 to dye PA56 fabric respectively, as the liquor pickup rate of the fabric increases, the K / S value of the dyed fabric generally shows an increasing trend, but the influence of the liquor pickup rate on the K / S value is not obvious. For example, when the liquor pickup rate of the fabric increases from 20% to 80%, the increase in the K / S value is less than 0.5.

[0096] Example 9

[0097] This example provides a continuous dyeing method for bio-based nylon 56, and the specific steps are as follows:

[0098] (1) Prepare reactive blue 19 dye baths with mass concentrations of 20 g / L, 30 g / L, 40 g / L, 60 g / L, 80 g / L and a pH value of 12; take 5 groups of PA56 fabrics (0.5 g each) and immerse them in the above different mass concentration reactive blue 19 dye baths for 30 s one by one;

[0099] (2) Use a vertical padding mangle to pad the dye liquor on the above PA56 fabrics evenly, and at the same time control the liquor pickup rate of the fabric to be 20%;

[0100] (3) Put the padded PA56 fabrics into a fixing medium (decamethylcyclopentasiloxane) at 70 °C, take them out after fixing for 1.5 min;

[0101] (4) Scrub the fixed PA56 fabrics at 90 °C for 10 min, and then dry them to obtain dyed fabrics, and test their K / S values and fixation rates. The test results are as Figure 10 shown.

[0102] Combined with Figure 10 As shown in Figure 10 , when using reactive blue 19 to dye PA56 fabric, as the dye mass concentration increases, the K / S value of the dyed fabric shows an increasing trend, while the fixation rate of the dyed fabric shows a decreasing trend. According to Figure 10 it can be seen that when the dye mass concentration is 20 g / L (relatively low cost), the K / S value of the dyed fabric can reach 8.5, and the fixation rate can reach more than 99.5%.

[0103] Example 10

[0104] This example is basically the same as the continuous dyeing method of bio-based nylon 56 in Example 9. The difference is that in this example, the dye bath is prepared with reactive red 278; the test results of the K / S value and fixation rate of the dyed fabric are as Figure 11 shown.

[0105] Combined with Figure 11As shown, when using Reactive Red 278 to dye PA56 fabric, with the increase of the dye mass concentration, the K / S value of the dyed fabric shows an increasing trend, while the fixation rate of the dyed fabric shows a decreasing trend. According to Figure 11 It can be seen that when the dye mass concentration is 20 g / L (relatively low cost), the K / S value of the dyed fabric is about 3.5, and the fixation rate is about 73.8%.

[0106] Comparative Example 1

[0107] This comparative example provides a dyeing method for bio-based nylon 56, and the specific steps are as follows:

[0108] (1) Immerse and dye PA56 fabric (0.5 g) with Cideron Blue N-S (acid dye solution) and Cideron Red N-S (acid dye solution) with a dye mass concentration of 1.0 g / L and a pH value of 4 respectively. The fixation temperature is 70 °C and the fixation time is 40 min;

[0109] (2) Wash and dry the dyed fabric to obtain the dyed fabric.

[0110] Take the dyed fabrics corresponding to the dye mass concentration of 20 g / L in Example 9 and Example 10 and compare them with the dyed fabric obtained in Comparative Example 1. The test items and results are shown in Table 1 below.

[0111] Table 1:

[0112]

[0113] For the dyed fabric obtained by continuous dyeing and processing of bio-based PA56 by the method of the present invention, it has a high fixation rate, reaching 99%, and at the same time has good dyeing build-up. Compared with the rubbing fastness of the dyed fabric obtained by acid dye dipping, the rubbing fastness of the PA56 dyed fabric obtained by the continuous dyeing and processing technology provided by the method of the present invention has been improved from level 3 to level 4-5, an increase of one and a half levels.

[0114] On the other hand, the present invention provides a dyed fabric obtained by processing according to the above continuous dyeing method.

[0115] On yet another aspect, the present invention provides an application of the above dyed fabric in the textile and clothing fields.

[0116] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention. To avoid unnecessary repetition, the present invention will not separately describe various possible combinations. However, these simple modifications and combinations should also be regarded as the content disclosed by the present invention and fall within the protection scope of the present invention.

Claims

1. A continuous dyeing method for bio-based nylon 56, characterized in that: The method comprises the steps of impregnating the bio-based nylon 56 to be dyed with a dye solution containing a dye, and then placing the impregnated bio-based nylon 56 into a color fixing medium for color fixing treatment.

2. The continuous dyeing method according to claim 1, characterized in that: The dye is a reactive dye.

3. The continuous dyeing method according to claim 1, characterized in that: The pH value of the dye solution is 3.0-13.0, and the mass concentration of the dye in the dye solution is 20.0-80.0 g / L; Preferably, the pH value of the dye solution is 12, and the mass concentration of the dye in the dye solution is 20 g / L.

4. The continuous dyeing method according to claim 1, characterized in that: After the impregnation treatment, the liquid carrying rate of the bio-based nylon 56 is 20-80%, preferably 20%.

5. The continuous dyeing method according to claim 1, characterized in that: The color fixing medium is selected from one or more of decamethylcyclopentasiloxane, liquid paraffin, and anhydrous ethanol.

6. The continuous dyeing method according to claim 1, characterized in that: The fixing treatment conditions include: a fixing temperature of 70-95°C and a fixing time of 0.5-3min; Preferably, the fixing temperature is 70° C. and the fixing time is 1.5 min.

7. The continuous dyeing method according to any one of claims 1 to 6, characterized in that: The continuous dyeing method further comprises the steps of soaping, washing and drying the bio-based nylon 56 after the fixation treatment.

8. The continuous dyeing method according to claim 7, characterized in that: The soap washing conditions include: soap washing at a temperature of 90-95° C. for 10-20 min.

9. The dyed fabric obtained by the continuous dyeing method according to any one of claims 1 to 8.

10. Use of the dyed fabric according to claim 9 in the field of textiles and clothing.

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