A high colorfastness polyamide 56 fabric and its preparation method

Abstract

This invention relates to the field of textile printing and dyeing, and discloses a high-colorfastness polyamide 56 fabric and its preparation method. The polyamide 56 fabric contains 70-100% polyamide 56 fiber and 0-30% spandex. The fabric has been dyed at least once, and the dye used for dyeing is a reactive dye. The polyamide 56 fabric dyed with reactive dyes of this invention has the advantages of higher dye uptake, wider pH adaptability, no need for large amounts of calcium salts for dyeing, and minimal or no use of color-fixing crosslinking agents.

Description

Technical Field

[0001] This invention relates to the field of textile printing and dyeing, specifically to a high color fastness polyamide 56 fabric and its preparation method. Background Technology

[0002] The dyes commonly used for dyeing polyamide fibers are acid dyes, 1:2 metal complex dyes, and a small amount of disperse dyes. However, the color fastness to wet treatment is poor, especially in the dyeing of bright-colored, fully matte fine denier fibers. Multiple color-fixing treatments are required to improve this. On the one hand, multiple washing and color-fixing processes increase the number of steps and reduce winding efficiency. The use of a large number of auxiliaries also increases processing costs and makes the treatment of dyeing wastewater more difficult. On the other hand, multiple color-fixing processes significantly increase fiber damage, worsen the hand feel, and reduce water absorption. To address the issues associated with acid dyes and 1:2 metal complex dyes in polyamide fiber dyeing, specialized reactive dyes for polyamide fibers, such as Eriofast, Yalilong ZD, Fangkesu AN, and Unilao P, have been gradually introduced to the market in recent years for dyeing and processing fully matte fine denier fiber fabrics. Because reactive dyes can react with the terminal amino groups of high molecular weight polyamide fibers to form covalent bonds, wet treatment color fastness is significantly improved compared to traditional acid dyes and 1:2 metal complex dyes. However, problems such as poor dyeing depth and low fixation rate still exist during application. A large amount of calcium salt is required for dyeing acceleration during the dyeing stage. At the same time, after dyeing, thorough alkaline washing is required to remove floating dye, and crosslinking agents are used to further improve color fastness and dyeing depth. Summary of the Invention

[0003] The purpose of this invention is to apply reactive dyes to the dyeing of polyamide 56 to solve the problems of poor color fastness of conventional acid dyes and 1:2 metal complex dyes in wet treatment, as well as the problem of dyeing depth of traditional polyamide fibers with reactive dyes, and to provide a high color fastness bio-based polyamide 56 fabric and its preparation method.

[0004] The first aspect of the present invention provides a high color fastness bio-based polyamide 56 fabric, wherein the polyamide 56 fabric contains 70-100% polyamide 56 fiber and 0-30% spandex, and the fabric has been dyed at least once, wherein the dye used for dyeing is a reactive dye.

[0005] In some embodiments, the reactive dye includes Eriofast dyes, Yalilong ZD series dyes, spunbond AN dyes, or Uniladium P dyes, preferably Eriofast dyes or Yalilong ZD series dyes. The Yalilong ZD series dyes include, but are not limited to, dyes such as Light Yellow ZD-6G, Yellow ZD-2R, Red ZD-2R, Deep Red ZD-R, Red ZD-GX, Brilliant Blue ZD-3R, Ocean Blue ZD-BG, Dark Blue ZD-V, and Black ZD-M.

[0006] In some embodiments, the amino content of the polyamide 56 fiber is 20-100 mmol / kg, more specifically 40-90 mmol / kg, and even more specifically 50-80 mmol / kg.

[0007] In some embodiments, the relative viscosity of the polyamide 56 fiber is 2.2-3.6, more specifically 2.4-3.3, and even more specifically 2.7-3.0.

[0008] In some embodiments, the dyeing process includes: adding the fabric to be dyed to a prepared dye solution, heating to 90-100℃ at a rate of 0.5-1.5℃ / min and maintaining the temperature for 20-60 minutes, and then cooling to below 50℃ at a rate of 0.5-2.0℃ / min; the dye solution may optionally contain a dyeing accelerator; and the pH value of the dye solution is 4-7.

[0009] In some embodiments, the fabric may also undergo a color-fixing and cross-linking post-treatment. The color-fixing and cross-linking post-treatment process includes: adding the polyamide 56 fabric, which has been dyed with reactive dyes and washed, to a color-fixing treatment solution, heating it at 2.0-5.0℃ / min to 40-70℃ and holding it at that temperature for 20-40 minutes, and then cooling it at 0.5-3.0℃ / min to below 50℃.

[0010] The second aspect of the present invention provides a method for preparing a high color fastness bio-based polyamide 56 fabric, the method comprising: dyeing the polyamide 56 fabric with a dyeing solution containing reactive dyes, washing it with water; and optionally subjecting the washed fabric to a color-fixing crosslinking post-treatment.

[0011] In some embodiments, the amount of the reactive dye used is 0.5-6% owf, more specifically 2-6% owf.

[0012] In some embodiments, the dye solution further includes a leveling agent and an optional dyeing accelerator.

[0013] According to a preferred embodiment of the present invention, the leveling agent includes anionic, cationic, nonionic, amphoteric, or anionic / nonionic compound leveling agents, preferably anionic / nonionic compound leveling agents, and more preferably at least one of Levegal FTSK, Univadine MC, TF-217BA, and SETAVIN PA-1C60, more preferably Levegal FTSK and / or Univadine MC.

[0014] According to a preferred embodiment of the present invention, the amount of the dyeing accelerator is 0-5%, for example 0%, 0.5%, 1%, 2%, 3%, 4%, 5%, etc., and the dyeing accelerator is preferably calcium chloride, and the percentage is a percentage relative to the mass of the fabric being dyed.

[0015] In some embodiments, the pH value of the dye solution is controlled at 4-7, preferably 6-7.

[0016] The dyeing process and the range of reactive dyes described in step (1) of this invention are as previously described and will not be repeated here.

[0017] In some embodiments, the color-fixing treatment solution includes a color-fixing crosslinking agent, Eriofast Fix, and an alkali agent.

[0018] According to a preferred embodiment of the present invention, the amount of the color-fixing crosslinking agent is 0-30% of the amount of dye, and the percentage is a mass percentage. That is, the amount of color-fixing crosslinking agent % = the amount of dye % × A, where A ranges from 0-0.3.

[0019] In some embodiments, the amount of the alkali agent used is 0.2-1.0 g / L, for example, sodium hydroxide.

[0020] The color-fixing and cross-linking post-treatment process described in step (2) of this invention is as described above and will not be repeated here.

[0021] The present invention further includes pretreatment and pre-forming steps before dyeing the polyamide 56 fabric.

[0022] In some embodiments, the pretreatment step includes pretreating the fabric at 70-80°C for 20-30 minutes using a degreasing agent (0.5-2.0%) and sodium carbonate (0.5-2.0 g / L), followed by washing and a neutralization process to control the fabric pH value to 6.5-7.5. This invention removes spinning oils, weaving oils, sizing agents, and impurities such as oil stains and dust acquired during transportation and storage from the fibers through pretreatment.

[0023] In some embodiments, the pre-forming step includes pre-forming the pretreated fabric at 190-200°C for 30-60 seconds, with the concentration of the heat-resistant yellowing agent being 0.5-5 g / L. The purpose of the pre-forming in this invention is mainly to eliminate wrinkles generated when the fabric relaxes and creases, improve the dimensional stability of the fabric, and prevent creases from appearing during subsequent dyeing processes.

[0024] In this invention, after dyeing or color-fixing cross-linking post-treatment, the method further includes an alkaline washing step to remove floating color, which includes: using 1-5 g / L of soaping agent and 1-5 g / L of sodium carbonate to soap the fabric at 50-80°C for 8-20 minutes.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The polyamide 56 fabric dyed with reactive dyes according to this invention has the advantages of higher dye uptake, wider pH adaptability, no need for large amounts of calcium salts to promote dyeing, and little or no use of color-fixing crosslinking agents. Compared with traditional acid dyes and 1:2 metal complex dyes, it still has high color fastness in the field of bright colors, and the dyed fabric surface has good water absorption. Detailed Implementation

[0027] The following are specific embodiments of the present invention. These embodiments are intended to further describe the present invention and not to limit it. Experimental methods in the following embodiments that do not specify specific conditions were performed according to conventional methods and conditions, or as selected according to the product instructions.

[0028] The following examples and comparative examples illustrate the various test methods:

[0029] 1. Wash fastness: Tested according to ISO 105-C02.

[0030] 2. Water fastness: Tested according to ISO 105-E01.

[0031] 3. Color fastness to perspiration: Tested according to ISO 105-E02.

[0032] 4. Water droplet penetration time: Lay the fabric horizontally and drop a drop of water (about 0.02 mL) vertically at a distance of 1 cm from the fabric surface. Record the time (s) required for the water droplet to be completely absorbed by the fabric. Test 9 points on the same sample and take the average value.

[0033] 5. Dyeing percentage: Use a UV-Vis spectrophotometer to measure the absorbance of the dye solution before and after dyeing at the maximum absorption wavelength, and calculate the dyeing percentage according to the following formula.

[0034]

[0035] Where A0 is the absorbance of the dye solution before staining, n0 is the dilution factor of the dye solution before staining, A1 is the absorbance of the dye solution after staining, and n1 is the dilution factor of the dye solution after staining.

[0036] 6. K / S value: The color depth K / S value of the dyed sample was tested using a Datacolor 650 computer colorimeter.

[0037] In the following examples and comparative examples, the pretreatment step includes pretreating the fabric at 70°C for 20 minutes using commercially available degreasing agent TF-129A 0.5% and sodium carbonate 2.0 g / L; the pre-forming step includes pre-forming the pretreated fabric at 195°C for 30 seconds, with the concentration of the heat anti-yellowing agent being 2 g / L.

[0038] Example 1

[0039] Pre-treated and pre-shaped polyamide 56 fabric (containing 80 wt% polyamide 56 fiber and 20 wt% spandex, where the amino content of polyamide 56 fiber is 53 mmol / kg and the relative viscosity is 2.78) was dyed with Eriofast reactive dyes. The dye bath formula was: Eriofast Red 2B 2.0% owf, leveling agent (Univadine MC) 1.0% owf, and calcium chloride 0%. The dyeing pH was adjusted to 4.0, 5.0, 6.0, and 7.0 using an acetate-sodium acetate buffer solution. The dyeing process was as follows: heating to 95℃ at 1.0℃ / min and holding for 40 min, followed by cooling to below 50℃ at 2.0℃ / min. After dyeing, the fabric was soaped at 60℃ for 10 min with 2 g / L soaping agent and 2 g / L sodium carbonate. The dye uptake rate under different pH conditions was compared, and the results are shown in Table 1.

[0040] Example 2

[0041] The pre-treated and pre-shaped polyamide 56 fabric (containing 80 wt% polyamide 56 fiber and 20 wt% spandex, wherein the amino content of polyamide 56 fiber is 53 mmol / kg and the relative viscosity is 2.78) was dyed with Eriofast reactive dyes. The dye bath formula was: Eriofast Red 2B 2.0% owf, leveling agent (Univadine MC) 1.0% owf, calcium chloride 0%. The dyeing pH was adjusted to 4.0, 5.0, 6.0 and 7.0 respectively using acetate-sodium acetate buffer solution. The dyeing process was as follows: heating to 95℃ at 1.0℃ / min and holding for 40 min, then cooling to below 50℃ at 2.0℃ / min. After dyeing, the dye was washed with water for color fixation and crosslinking treatment. The treatment involved 0.6% Eriofast Fix and 0.5 g / L sodium hydroxide, with the temperature increased at 2.0 °C / min to 60 °C and held for 30 min, followed by a decrease to below 50 °C at 2.0 °C / min. After color fixation and crosslinking, the dye was soaped at 60 °C for 10 min with 2 g / L soaping agent and 2 g / L sodium carbonate. The dye uptake rate was compared under different pH conditions, and the results are shown in Table 1.

[0042] Example 3

[0043] The pre-treated and pre-shaped polyamide 56 fabric (containing 80 wt% polyamide 56 fiber and 20 wt% spandex, wherein the amino content of polyamide 56 fiber is 53 mmol / kg and the relative viscosity is 2.78) was dyed with Yalilong ZD reactive dyes. The dye bath formula was: 2.0% owf of Yalilong ZD series dyes, 1.0% owf of leveling agent (Univadine MC), and the dyeing pH was adjusted to 6.5 using an acetate-sodium acetate buffer solution. The dyeing process was as follows: heating to 95℃ at 1.0℃ / min and holding for 40 min, then cooling to below 50℃ at 2.0℃ / min. After dyeing, the fabric was washed with water for color fixation and crosslinking post-treatment, which included Eriofast Fix 0.6% and sodium hydroxide 0.5 g / L, heating to 60℃ at 2.0℃ / min and holding for 30 min, then cooling to below 50℃ at 2.0℃ / min. After color fixation and crosslinking, the fabric was soaped at 60℃ for 10 minutes with 2 g / L soaping agent and 2 g / L sodium carbonate. The color fastness to soaping, water, perspiration (alkali) and water absorption of polyamide 56 fabric after dyeing with different dyes were tested. The results are shown in Table 2.

[0044] Example 4

[0045] The pre-treated and pre-shaped polyamide 56 fabric (containing 80 wt% polyamide 56 fiber and 20 wt% spandex, wherein the amino content of polyamide 56 fiber is 53 mmol / kg and the relative viscosity is 2.78) was dyed with Eriofast reactive dyes. The dye bath formula was: Eriofast Red 2B 0.5, 1.0, 2.0, 4.0 and 6.0% owf, leveling agent (Univadine MC) 1.0% owf, calcium chloride 0%, and the dyeing pH was adjusted to 6.0 using an acetate-sodium acetate buffer solution. The dyeing process was as follows: heating to 95℃ at 1.0℃ / min and holding for 40 min, then cooling to below 50℃ at 2.0℃ / min. After dyeing, the samples were washed with water for color fixation and crosslinking treatment. The treatment involved 0.6% Eriofast Fix and 0.5 g / L sodium hydroxide, with the temperature increased to 60°C at 2.0°C / min and held at that temperature for 30 min, followed by a decrease to below 50°C at 2.0°C / min. After color fixation, the samples were soaped at 60°C for 10 min with 2 g / L soaping agent and 2 g / L sodium carbonate. The K / S values ​​of the dyed samples at different dyeing depths were measured, and the results are shown in Table 3.

[0046] Comparative Example 1

[0047] Pre-treated and pre-shaped polyamide 66 fabric (containing 80 wt% polyamide 66 fiber and 20 wt% spandex) was dyed with Eriofast reactive dyes. The dye bath formula was: Eriofast Red2B 2.0% owf, leveling agent (Univadine MC) 1.0% owf, and calcium chloride 0%. The dyeing pH was adjusted to 4.0, 5.0, 6.0, and 7.0 using an acetate-sodium acetate buffer solution. The dyeing process was as follows: heating to 98℃ at 1.0℃ / min and holding for 40 min, followed by cooling to below 50℃ at 2.0℃ / min. After dyeing, the fabric was soaped at 60℃ for 10 min with 2 g / L soaping agent and 2 g / L sodium carbonate. The dye uptake rate under different pH conditions was compared, and the results are shown in Table 1.

[0048] Comparative Example 2

[0049] Pre-treated and pre-shaped polyamide 66 fabric (containing 80 wt% polyamide 66 fiber and 20 wt% spandex) was dyed with Eriofast reactive dyes. The dye bath formula was: Eriofast Red2B 2.0% owf, leveling agent (Univadine MC) 1.0% owf, and calcium chloride 10%. The dyeing pH was adjusted to 4.0, 5.0, 6.0, and 7.0 using an acetate-sodium acetate buffer solution. The dyeing process was as follows: heating to 98℃ at 1.0℃ / min and holding for 40 min, followed by cooling to below 50℃ at 2.0℃ / min. After dyeing, the fabric was soaped at 60℃ for 10 min with 2 g / L soaping agent and 2 g / L sodium carbonate. The dye uptake rate under different pH conditions was compared, and the results are shown in Table 1.

[0050] Comparative Example 3

[0051] The pre-treated and pre-shaped polyamide 66 fabric (containing 80 wt% polyamide 66 fiber and 20 wt% spandex) was dyed with Eriofast reactive dyes. The dye bath formula was: Eriofast Red2B 2.0% owf, leveling agent (Univadine MC) 1.0% owf, and calcium chloride 10%. The pH values ​​for dyeing were adjusted to 4.0, 5.0, 6.0, and 7.0 using an acetate-sodium acetate buffer solution. The dyeing process was as follows: heating to 98℃ at 1.0℃ / min and holding for 40 min, then cooling to below 50℃ at 2.0℃ / min. After dyeing, the fabric underwent a color-fixing and cross-linking post-treatment with Eriofast Fix 1.0% and sodium hydroxide 0.5 g / L. The treatment involved heating to 60℃ at 2.0℃ / min and holding for 30 min, then cooling to below 50℃ at 2.0℃ / min. After color fixation and crosslinking, the sample was soaped at 60℃ for 10 min with 2 g / L soaping agent and 2 g / L sodium carbonate. The dyeing rate was compared under different pH conditions, and the results are shown in Table 1.

[0052] Comparative Example 4

[0053] The pre-treated and pre-shaped polyamide 56 fabric (containing 80 wt% polyamide 56 fiber and 20 wt% spandex, wherein the amino content of polyamide 56 fiber is 53 mmol / kg and the relative viscosity is 2.78) was dyed with the 1:2 metal complex dye Lanaset Blue PA. The dye bath formula was: Lanaset Blue PA 2.0% owf, leveling agent (Levegal FTSK) 1.0% owf, and acid-releasing agent (A35) 1.0 g / L. The dyeing process was as follows: heating to 95℃ at 0.6℃ / min and holding for 30 min, then cooling to below 50℃ at 2.0℃ / min. After washing with water at 40℃ for 10 min, a color-fixing treatment was performed. The color-fixing agent AF-2N was used at 4% owf, the color-fixing pH was 3.0, the temperature was increased to 70℃ at 2.0℃ / min and held for 25 min, then cooled to 50℃ at 1℃ / min. The color fastness of the dyed polyamide 56 fabric to soap washing, water, perspiration (alkali) and water absorption were tested, and the results are shown in Table 2.

[0054] Comparative Example 5

[0055] The pre-treated and pre-shaped polyamide 6 fabric (containing 80 wt% polyamide 56 fiber and 20 wt% spandex) was dyed with Eriofast reactive dyes. The dye bath formula was: Eriofast Red 2B 0.5, 1.0, 2.0, 4.0, and 6.0% owf, leveling agent (Univadine MC) 1.0% owf, and calcium chloride 10%. The pH of the dyeing solution was adjusted to 5.0 using an acetate-sodium acetate buffer solution. The dyeing process was as follows: heating to 95℃ at 1.0℃ / min and holding for 40 min, then cooling to below 50℃ at 2.0℃ / min. After dyeing, the fabric underwent washing and color-fixing crosslinking post-treatment. Fix 1.0%, sodium hydroxide 0.5 g / L, heated to 60℃ at 2.0℃ / min and held at that temperature for 30 min, then cooled to below 50℃ at 2.0℃ / min. After color fixation and crosslinking, the samples were soaped at 60℃ for 10 min with soaping agent 2 g / L and sodium carbonate 2 g / L. The K / S values ​​of the dyed samples at different dyeing depths were tested, and the results are shown in Table 3.

[0056] Comparative Example 6

[0057] The pre-treated and pre-shaped polyamide 66 fabric (containing 80 wt% polyamide 56 fiber and 20 wt% spandex) was dyed with Eriofast reactive dyes. The dye bath formula was: Eriofast Red 2B 0.5, 1.0, 2.0, 4.0, and 6.0% owf, leveling agent (Univadine MC) 1.0% owf, and calcium chloride 10%. The pH of the dyeing solution was adjusted to 5.0 using an acetate-sodium acetate buffer solution. The dyeing process was as follows: heating to 95℃ at 1.0℃ / min and holding for 40 min, then cooling to below 50℃ at 2.0℃ / min. After dyeing, the fabric underwent washing and color-fixing crosslinking post-treatment. Fix 1.0%, sodium hydroxide 0.5 g / L, heated to 60℃ at 2.0℃ / min and held at that temperature for 30 min, then cooled to below 50℃ at 2.0℃ / min. After color fixation and crosslinking, the samples were soaped at 60℃ for 10 min with soaping agent 2 g / L and sodium carbonate 2 g / L. The K / S values ​​of the dyed samples at different dyeing depths were tested, and the results are shown in Table 3.

[0058] Table 1

[0059]

[0060] As shown in Table 1, polyamide 56 fibers exhibit a wider pH adaptability when dyed with Eriofast reactive dyes, with the dye uptake rate showing a slight increasing trend with increasing pH value. The effect of post-treatment with fixation and cross-linking on the dye uptake rate is also insignificant. In contrast, polyamide 66 requires a combination of calcium chloride and fixation / cross-linking processes to ensure a certain dye uptake rate, and dyeing must be carried out under acidic conditions with a pH of 4-5.

[0061] Table 2

[0062]

[0063] As shown in Table 2, the color fastness of polyamide 56 fabric can be maintained at level 4 or above after being dyed with reactive dyes, and the water absorption of the fabric is significantly improved compared with acid dyes.

[0064] Table 3

[0065]

[0066]

[0067] As can be seen from Table 3, the dyeing depth of polyamide 56 fabric is significantly better than that of polyamide 6 and polyamide 66 fabrics.

[0068] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A high color fastness bio-based polyamide 56 fabric, characterized in that, The polyamide 56 fabric contains 70-80% polyamide 56 fibers and 20-30% spandex, the fabric is at least dyed, the dye used for the dyeing is a reactive dye, and the reactive dye is Eriofast dye or Yalong ZD series dye. The dyeing process comprises: adding the dyed fabric into a prepared dyeing solution, increasing the temperature to 90-100 DEG C at a rate of 0.5-1.5 DEG C / min, keeping the temperature for 20-60 min, decreasing the temperature to below 50 DEG C at a rate of 0.5-2.0 DEG C / min, the pH value of the dyeing solution is 6-7, and the dyeing solution contains a leveling agent.

2. The high color fastness bio-based polyamide 56 fabric according to claim 1, wherein the amino content of the polyamide 56 fibers is 20-100 mmol / kg; and / or the relative viscosity of the polyamide 56 fibers is 2.2-3.

6.

3. The high color fastness bio-based polyamide 56 fabric according to claim 1, wherein the amino content of the polyamide 56 fibers is 40-90 mmol / kg; and / or the relative viscosity of the polyamide 56 fibers is 2.4-3.

3. The dyeing solution contains a dyeing promoter; and / or the amino content of the polyamide 56 fibers is 50-80 mmol / kg; and / or the relative viscosity of the polyamide 56 fibers is 2.7-3.

0. The fabric can be further subjected to a fixation and crosslinking post-treatment, and the fixation and crosslinking post-treatment process comprises: adding the polyamide 56 fabric after being dyed with a reactive dye and washed to a fixation treatment solution, increasing the temperature to 40-70 DEG C at a rate of 2.0-5.0 DEG C / min, keeping the temperature for 20-40 min, and decreasing the temperature to below 50 DEG C at a rate of 0.5-3.0 DEG C / min. The method comprises: dyeing the dyed polyamide 56 fabric with a dyeing solution containing a reactive dye, and washing; and optionally, subjecting the washed fabric to a fixation and crosslinking post-treatment. The dyeing process comprises: adding the dyed fabric into a prepared dyeing solution, increasing the temperature to 90-100 DEG C at a rate of 0.5-1.5 DEG C / min, keeping the temperature for 20-60 min, decreasing the temperature to below 50 DEG C at a rate of 0.5-2.0 DEG C / min, the pH value of the dyeing solution is 6-7, and the dyeing solution contains a leveling agent; and the reactive dye is Eriofast dye or Yalong ZD series dye.

4. The high color fastness bio-based polyamide 56 fabric according to claim 1, characterized in that, The amount of the reactive dye is 0.5-6% o.w.f. The amount of the reactive dye is 2-6% o.w.f. The dyeing solution further contains a dyeing promoter in an amount of 0-5%, and the percentage is relative to the mass percentage of the dyed fabric.

5. The high color fastness bio-based polyamide 56 fabric according to claim 1, wherein, The leveling agent is anionic, cationic, nonionic, amphoteric, or anionic / nonionic complex type.

6. A process for the preparation of high color fastness bio-based polyamide 56 fabric as claimed in any one of claims 1 to 5, characterized in that, The leveling agent is anionic / nonionic complex type; and / or the dyeing promoter is calcium chloride. The leveling agent is at least one of Levegal FTSK, Univadine MC, TF-217BA, and SETAVIN PA-1C60.

7. The process for preparing high color fastness bio-based polyamide 56 fabric according to claim 6, characterized in that, The leveling agent is Levegal FTSK and / or Univadine MC.

8. The process for preparing high color fastness bio-based polyamide 56 fabric according to claim 7, characterized in that, ​ 9. The process for preparing high color fastness bio-based polyamide 56 fabric according to claim 6, characterized in that, ​ ​ 10. The process for preparing high color fastness bio-based polyamide 56 fabric according to claim 9, characterized in that, ​ ​ 11. The process for preparing high color fastness bio-based polyamide 56 fabric according to claim 9, characterized in that, ​ 12. The process for preparing high color fastness bio-based polyamide 56 fabric according to claim 9, characterized in that, ​ 13. The process for preparing high color fastness bio-based polyamide 56 fabric according to claim 6, characterized in that, The fixing and cross-linking post-treatment process comprises: adding a fixing treatment liquid into the polyamide 56 fabric after the active dyeing and water washing, heating at 2.0-5.0 ℃ / min to 40-70 ℃, and keeping the temperature for 20-40 min, and cooling at 0.5-3.0 ℃ / min to below 50 ℃.

14. The process for preparing the high color fastness bio-based polyamide 56 fabric according to claim 6 or 13, characterized in that, The fixing treatment liquid comprises a fixing and cross-linking agent Eriofast Fix and an alkali agent. The fixing and cross-linking agent is used in an amount of 0-30% of the amount of the dye, and the percentage is a mass percentage. The alkali agent is used in an amount of 0.2-1.0 g / L.

15. The process for preparing a high color fastness bio-based polyamide 56 fabric according to claim 14, characterized in that, The alkali agent is sodium hydroxide.

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