One-bath dyeing method for polyester-viscose blended fabric

Abstract

The invention discloses a one-bath dyeing method for a polyester-viscose blended fabric, and belongs to the technical field of textile dyeing. According to the invention, the production characteristics of viscose fibers are utilized, a silane coupling agent cross-linked octadecyl trimethyl ammonium chloride functional modified polyester-viscose blended fabric is used as a matrix, and a cationic reactive dye and an anionic disperse dye are sequentially deposited by utilizing an alternate cross-linking self-assembly method. The method provided by the invention not only solves the problems of dispersibility and reagglomeration of the disperse dye and the reactive dye, but also enhances the adhesion between the disperse dye and the reactive dye and the polyester-viscose blended fabric, does not need a large amount of chemical adhesion reagents, and is green and environment-friendly, simple to operate and low in cost compared with an existing chemical method.

Description

Technical Field

[0001] The invention relates to a one-bath dyeing method for polyester-viscose blended fabrics, belonging to the technical field of textile dyeing. Background Art

[0002] In the field of fabric dyeing and finishing, various fibers in blended fabrics have coloring problems due to large differences in performance. Polyester fiber has the characteristics of high strength, wear resistance, excellent resilience and heat setting, can maintain the bending deformation formed when heated, and has a light texture. However, its levelness and dyeing depth are poor, so it is easy to cause uneven dyeing during the dyeing process. The basic chemical composition of viscose fiber is the same as that of cotton fiber, so it is close to cotton fiber in some properties, for example, it has good softness; at the same time, viscose fiber has the smoothness of silk fiber, and its hygroscopicity, air permeability and gloss are better than cotton fiber. Therefore, viscose fiber has good dyeing performance, is easier to color than cotton fiber, and has pure and bright colors, and the most complete color spectrum; however, the biggest disadvantage of viscose fiber is poor wet strength, the fabric is easy to wrinkle and difficult to recover. By blending polyester fiber and viscose fiber, a blended fabric that is soft, moisture-absorbent, breathable and has good strength can be obtained. However, the performance of these two fibers is quite different. The traditional dyeing and finishing process requires the blended fabric to be degreased, dyed with polyester, cleaned, dyed with viscose, and soaped before dyeing can be completed. The energy consumption is very high. As environmental pressure increases, various production costs are also increasing.

[0003] For the dyeing of polyester and viscose fibers, the traditional method is to adopt the "two-bath method", dyeing the polyester fiber first, draining the liquid and then dyeing the viscose fiber, which consumes a lot of energy; there is also a method of using the "one-bath two-step method", selecting salt-resistant disperse dyes and high-temperature resistant direct dyes for dyeing, but because it is necessary to use multiple dyes and add them in batches, the process time is long and the operation is complicated. Direct dyes are unstable at high temperatures and viscose is prone to color shift. At the same time, in order to solve the dyeing defects of direct-reactive dyes under high temperature conditions, multiple dyes are generally used. However, the disadvantage of using multiple dyes is that it is difficult to match colors and the reproducibility is poor. It is impossible to achieve one-step and one-bath dyeing of polyester and viscose blended fabrics, and the dyeing effect is poor and the cost is high.

[0004] Therefore, in order to overcome the above-mentioned problems in the prior art, a new dyeing and finishing process for polyester and viscose blended fabrics is needed to reduce the usage of various dyes and auxiliaries and the amount of sewage discharged, improve the utilization rate of dyeing and finishing equipment, improve the energy consumption time of dyeing and finishing process, and reduce costs. Summary of the invention

[0005] In order to solve the problem of dyeing polyester and viscose blended fabrics in one step and one bath, the invention provides a one-bath dyeing method for polyester-viscose blended fabrics and a preparation method thereof.

[0006] The present invention is achieved through the following technical solutions:

[0007] The first object of the present invention is to provide a one-bath dyeing method for polyester-viscose blended fabrics, comprising the following steps:

[0008] (1) performing impurity removal pretreatment on a polyester-viscose blended fabric to obtain a pretreated polyester-viscose blended fabric;

[0009] (2) using octadecyltrimethylammonium chloride (STAC) and a silane coupling agent to modify the polyester-viscose blended fabric after the impurity removal pretreatment in step (1) to obtain a polyester-viscose blended fabric after surface modification;

[0010] (3) dipping the modified polyester-viscose blended fabric obtained in step (2) in a mixed dispersion of a cationic active dye and a disperse dye, drying, and repeating the dipping-drying operation 2-5 times; performing reduction cleaning, washing, and drying to obtain a dyed polyester-viscose blended fabric.

[0011] In one embodiment of the present invention, the impurity removal pretreatment in step (1) is to immerse the polyester-viscose blended fabric in a solution containing 0.2-8.5 g / L soda ash, 0.15-5.5 g / L degreasing agent RG-Y100 and 2-70 g / L hydrogen peroxide, and then immerse it at a constant temperature of 70-90°C for 30-120 minutes, then take it out, wash it with water, perform reduction cleaning, wash it with water, dry it, weigh it for use, and the bath ratio is 1:60-80.

[0012] In one embodiment of the present invention, the cationic active dye in step (2) is cationic yellow X-5GL, cationic red X-GRL, cationic blue X-BL, cationic golden yellow X-GL, cationic red X-GTL or cationic blue FGRL, and the disperse dye is anionic disperse dye K-1 or anionic disperse dye K-2.

[0013] The molecular structure of anionic disperse dye K-1 is:

[0014]

[0015] The molecular structure of anionic disperse dye K-2 is:

[0016]

[0017] In one embodiment of the present invention, the modification described in step (2) is to immerse the polyester-viscose blended fabric after impurity removal pretreatment in a mixed solution containing octadecyltrimethylammonium chloride (STAC) and a silane coupling agent, the solution pH is 8-10, washed with water, and dried; wherein the concentration of octadecyltrimethylammonium chloride (STAC) in the mixed solution is 0.25-8.5M; the concentration ratio of octadecyltrimethylammonium chloride (STAC) to the silane coupling agent is 2:3-4, and the concentration of the buffer solution is 0.5-4.5M.

[0018] In one embodiment of the present invention, the silane coupling agent described in step (1) is one of A151 (vinyl triethoxy silane), A171 (vinyl trimethoxy silane), A172 (vinyl tri (β-methoxyethoxy) silane), silane coupling agent KH-560, and silane coupling agent KH-570.

[0019] In one embodiment of the present invention, the impregnation in the modification process of step (2) is carried out at room temperature of 25-45°C with magnetic stirring at 50-120 rpm for 16-54 hours.

[0020] In one embodiment of the present invention, the concentration of the cationic active dye in step (3) is 1.5-45 mM, and the concentration of the disperse dye is 2.5-65 mM.

[0021] In one embodiment of the present invention, the immersion temperature in step (3) is 95-125° C. and the time is 30-120 min.

[0022] In one embodiment of the present invention, the pH of the mixed dispersion in step (3) is 4-7.

[0023] In one embodiment of the present invention, the reduction cleaning in step (3) is as follows: placing the dyed fabric at 40°C, heating it to 40-80°C at a rate of 1.5°C / min and keeping it warm for 5-30min (ultrasonic power is 60-120W, ultrasonic reduction cleaning), then washing, dehydrating and drying, wherein the acidic reduction cleaning agent DM-8931 is 1.5-4.5g / L, soda ash is 2.5-10.5g / L, and the bath ratio is 1:40.

[0024] Beneficial effects of the present invention:

[0025] The invention utilizes the production characteristics of viscose fiber, takes the polyester-viscose blended fabric functionally modified by silane coupling agent cross-linking octadecyltrimethylammonium chloride (STAC) as the matrix, and utilizes the method of alternating cross-linking self-assembly to sequentially deposit cationic active dyes and anionic disperse dyes.

[0026] On the one hand, the adsorption of octadecyltrimethylammonium chloride (STAC) on the surface of viscose fiber leads to the enhancement of its electrostatic attraction to anionic disperse dyes and electrostatic repulsion to cationic active dyes, and the blockage of some pores between fibers, which inhibits the agglomeration of cationic active dyes on polyester-viscose blended fabrics and the excessive spreading of anionic disperse dyes. At the same time, the electrostatic adsorption of cationic active dyes and anionic disperse dyes inhibits the agglomeration of cationic active dyes and anionic disperse dyes on polyester-viscose blended fabrics.

[0027] On the other hand, cationic active dyes and anionic disperse dyes can be intercalated on the functionally modified polyester-viscose blended fabric to act as nano-space barriers. After washing and drying, the second layer of cationic active dyes and disperse dyes are deposited. The second layer of film is deposited on the surface of the first layer by the electrostatic adsorption driving force between the cationic active dyes and the anionic disperse dyes. The second layer of film is washed and dried again to complete a cycle, and then the above steps are repeated to the required number of layers. Such a deposition effect not only increases the contact area between the cationic active dyes and the anionic disperse dyes and the polyester-viscose blended fabric, but also enhances the adhesion of the cationic active dyes and the anionic disperse dyes to the polyester-viscose blended fabric.

[0028] The one-bath dyeing method for polyester-viscose blended fabrics developed by the present invention not only solves the dispersibility and reagglomeration problems of disperse dyes and reactive dyes, but also enhances the adhesion between them and the polyester-viscose blended fabrics without requiring a large amount of chemical adhesion agents. Compared with the existing chemical methods, the process method of the present invention is green, environmentally friendly, simple to operate and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is the process curve of one-bath dyeing of polyester-viscose blended fabric. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with specific examples. These implementation cases are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope limited by the claims attached to the application.

[0032] Test method:

[0033] Color fastness

[0034] The color fastness to washing is determined in accordance with ISO 105C10-2006 "Textiles - Tests for color fastness - Part C10: Color fastness to washing with soap or soda water".

[0035] The color fastness to rubbing is determined in accordance with ISO 105X12-2001 "Textiles - Tests for color fastness - Part X12: Color fastness to rubbing".

[0036] The color fastness to sunlight is determined in accordance with ISO 105B02-2013 “Textiles - Tests for color fastness - Part B02: Fastness to artificial colored light: Xenon arc fading test”.

[0037] Dyeing rate

[0038] The absorbance of the dye solution at the maximum absorption wavelength before and after dyeing was tested by UV-visible spectrophotometer, and the dye uptake rate E was calculated according to formula (1).

[0039]

[0040] In the formula: A0 is the absorbance of the original dye solution before dyeing; A1 is the absorbance of the residual dye solution after dyeing.

[0041] The technical solution of the present invention is described in detail below in conjunction with specific embodiments. In the following embodiments, unless otherwise specified, the reagents, materials and equipment used can be purchased from commercial sources, or prepared by conventional methods, or are commonly used in the industry.

[0042] Embodiment 1:

[0043] A one-bath dyeing method for polyester-viscose blended fabrics comprises the following steps:

[0044] (1) The polyester-viscose blended fabric was immersed in a solution containing 0.4 g / L soda ash, 0.4 g / L degreasing agent RG-Y100 and 4 g / L hydrogen peroxide, and then immersed at a constant temperature of 80°C for 50 min, washed, dried, weighed and set aside, with a bath ratio of 1:70.

[0045] (2) immersing the polyester-viscose blended fabric obtained in step (1) after the impurity removal pretreatment in a mixed solution containing octadecyltrimethylammonium chloride (STAC) (3M) and silane coupling agent K560 (5.25M), the solution pH being 8.5; and then magnetically stirring at 80 rpm at room temperature 25°C for 24 hours;

[0046] (3) The modified polyester-viscose blended fabric obtained in step (2) is immersed in a mixed dispersion of cationic yellow X-5GL (4 mM) and anionic disperse dye K-1 (4.5 mM), the solution pH is 5, the immersion temperature is 100° C., the immersion time is 60 min, and then dried at 60° C. for 30 min, and the immersion-drying operation is repeated 3 times; reduction cleaning is performed to obtain a dyed polyester-viscose blended fabric.

[0047] The reduction cleaning is as follows: putting the dyed fabric at 40°C, heating it to 80°C at 1.5°C / min and keeping it warm for 30min (ultrasonic power is 100W, ultrasonic reduction cleaning), then washing, dehydrating and drying, wherein the acidic reduction cleaning agent DM-89313.5g / L, soda ash 2.5g / L, and the bath ratio is 1:50.

[0048] The test results of dyed polyester-viscose blended fabrics are: dyeing rate is 97.4%, color fastness to rubbing is level 4 (dry), level 4-5 (wet), color fastness to soaping: color change level 4, wool staining level 4-5, cotton staining level 4, color fastness to perspiration: color change level 4, wool staining level 4-5, cotton staining level 4-5.

[0049] Embodiment 2:

[0050] A one-bath dyeing method for polyester-viscose blended fabrics comprises the following steps:

[0051] (1) The polyester-viscose blended fabric was immersed in a solution containing 0.8 g / L soda ash, 0.5 g / L degreasing agent RG-Y100 and 5 g / L hydrogen peroxide, and then immersed at a constant temperature of 80°C for 60 min, taken out, washed, dried, weighed and set aside, with a bath ratio of 1:70.

[0052] (2) immersing the polyester-viscose blended fabric obtained in step (1) after the impurity removal pretreatment in a mixed solution containing octadecyltrimethylammonium chloride (STAC) (3.5 M) and silane coupling agent K560 (6.125 M), the solution pH being 8.5; and then magnetically stirring at 80 rpm at room temperature 25° C. for 24 h;

[0053] (3) The modified polyester-viscose blended fabric obtained in step (2) is immersed in a mixed dispersion of cationic red X-GRL (4.6 mM) and anionic disperse dye K-2 (5.5 mM), the solution pH is 5.5, the immersion temperature is 110° C., the immersion time is 70 min, and then dried at 60° C. for 30 min, and the immersion-drying operation is repeated 3 times; reduction cleaning is performed to obtain a dyed polyester-viscose blended fabric.

[0054] The reduction cleaning is as follows: putting the dyed fabric at 40°C, heating it to 80°C at 1.5°C / min and keeping it warm for 30min (ultrasonic power is 100W, ultrasonic reduction cleaning), then washing, dehydrating and drying, wherein the acidic reduction cleaning agent DM-89314.5g / L, soda ash 4.5g / L, and the bath ratio is 1:50.

[0055] The test results of dyed polyester-viscose blended fabrics are: dyeing rate is 98.3%, color fastness to rubbing is level 4 (dry), level 4-5 (wet), color fastness to soaping: color change level 4-5, wool staining level 4, cotton staining level 4-5, color fastness to perspiration: color change level 4-5, wool staining level 4, cotton staining level 4-5.

[0056] Comparative Example 1:

[0057] (1) The polyester-viscose blended fabric was immersed in a solution containing 0.4 g / L soda ash, 0.4 g / L degreasing agent RG-Y100 and 4 g / L hydrogen peroxide, and then immersed at a constant temperature of 80°C for 50 min, taken out, washed, dried, weighed and set aside, with a bath ratio of 1:70.

[0058] (2) immersing the polyester-viscose blended fabric obtained in step (1) after the impurity removal pretreatment in a solution of silane coupling agent K560 (5.25 M), the solution pH being 8.5; and then magnetically stirring at 80 rpm at room temperature 25° C. for 24 h;

[0059] (3) The modified polyester-viscose blended fabric obtained in step (2) is immersed in a mixed dispersion of cationic yellow X-5GL (4 mM) and anionic disperse dye K-1 (4.5 mM), the solution pH is 5, the immersion temperature is 100° C., the immersion time is 60 min, and then dried at 60° C. for 30 min, and the immersion-drying operation is repeated 3 times; reduction cleaning is performed to obtain a dyed polyester-viscose blended fabric.

[0060] The reduction cleaning is as follows: putting the dyed fabric at 40°C, heating it to 80°C at 1.5°C / min and keeping it warm for 30min (ultrasonic power is 100W, ultrasonic reduction cleaning), then washing, dehydrating and drying, wherein the acidic reduction cleaning agent DM-89313.5g / L, soda ash 2.5g / L, and the bath ratio is 1:50.

[0061] The test results of dyed polyester-viscose blended fabrics are: dyeing rate is 88%, color fastness to rubbing: level 3 (dry), level 2 (wet), color fastness to soaping: level 3 for discoloration, level 3 for wool staining, level 4 for cotton staining, color fastness to perspiration: level 3 for discoloration, level 3 for wool staining, level 3 for cotton staining.

[0062] Comparative Example 2:

[0063] (1) The polyester-viscose blended fabric was immersed in a solution containing 0.4 g / L soda ash, 0.4 g / L degreasing agent RG-Y100 and 4 g / L hydrogen peroxide, and then immersed at a constant temperature of 80°C for 50 min, taken out, washed, dried, weighed and set aside, with a bath ratio of 1:70.

[0064] (2) immersing the polyester-viscose blended fabric obtained in step (1) after the impurity removal pretreatment in a 3M octadecyltrimethylammonium chloride (STAC) solution, the pH of the solution being 8.5; and then stirring the mixture with a magnetic stirrer at 80 rpm for 24 h at room temperature of 25° C.;

[0065] (3) The modified polyester-viscose blended fabric obtained in step (2) is immersed in a mixed dispersion of cationic yellow X-5GL (4 mM) and anionic disperse dye K-1 (4.5 mM), the solution pH is 5, the immersion temperature is 100° C., the immersion time is 60 min, and then dried at 60° C. for 30 min, and the immersion-drying operation is repeated 3 times; reduction cleaning is performed to obtain a dyed polyester-viscose blended fabric.

[0066] The reduction cleaning is as follows: putting the dyed fabric at 40°C, heating it to 80°C at 1.5°C / min and keeping it warm for 30min (ultrasonic power is 100W, ultrasonic reduction cleaning), then washing, dehydrating and drying, wherein the acidic reduction cleaning agent DM-89313.5g / L, soda ash 2.5g / L, and the bath ratio is 1:50.

[0067] The test results of dyed polyester-viscose blended fabrics are: dyeing rate is 86%, color fastness to rubbing: level 3 (dry), level 3 (wet), color fastness to soaping: level 3 for discoloration, level 4 for wool staining, level 3 for cotton staining, color fastness to perspiration: level 2 for discoloration, level 3 for wool staining, level 4 for cotton staining.

[0068] Comparative Example 3:

[0069] (1) The polyester-viscose blended fabric was immersed in a solution containing 0.4 g / L soda ash, 0.4 g / L degreasing agent RG-Y100 and 4 g / L hydrogen peroxide, and then immersed at a constant temperature of 80°C for 50 min, taken out, washed, dried, weighed and set aside, with a bath ratio of 1:70.

[0070] (2) immersing the polyester-viscose blended fabric obtained in step (1) after the impurity removal pretreatment in a mixed solution containing octadecyltrimethylammonium chloride (STAC) (3M) and silane coupling agent K560 (6.75M), the solution pH being 8.5; and then magnetically stirring at 80 rpm at room temperature 25°C for 24 hours;

[0071] (3) The modified polyester-viscose blended fabric obtained in step (2) is immersed in a mixed dispersion of cationic yellow X-5GL (4 mM) and anionic disperse dye K-1 (4.5 mM), the solution pH is 5, the immersion temperature is 100° C., the immersion time is 60 min, and then dried at 60° C. for 30 min, and the immersion-drying operation is repeated 3 times; reduction cleaning is performed to obtain a dyed polyester-viscose blended fabric.

[0072] The reduction cleaning is as follows: putting the dyed fabric at 40°C, heating it to 80°C at 1.5°C / min and keeping it warm for 30min (ultrasonic power is 100W, ultrasonic reduction cleaning), then washing, dehydrating and drying, wherein the acidic reduction cleaning agent DM-89313.5g / L, soda ash 2.5g / L, and the bath ratio is 1:50.

[0073] The test results of dyed polyester-viscose blended fabrics are: dyeing rate is 85.8%, color fastness to rubbing: level 3 (dry), level 3 (wet), color fastness to soaping: level 3 for discoloration, level 4 for wool staining, level 2 for cotton staining, color fastness to perspiration: level 3 for discoloration, level 3 for wool staining, level 3 for cotton staining.

[0074] Comparative Example 4:

[0075] (1) The polyester-viscose blended fabric was immersed in a solution containing 0.4 g / L soda ash, 0.4 g / L degreasing agent RG-Y100 and 4 g / L hydrogen peroxide, and then immersed at a constant temperature of 80°C for 50 min, taken out, washed, dried, weighed and set aside, with a bath ratio of 1:70.

[0076] (2) immersing the polyester-viscose blended fabric obtained in step (1) after the impurity removal pretreatment in a mixed solution containing octadecyltrimethylammonium chloride (STAC) (3M) and silane coupling agent K560 (5.25M), the solution pH being 8.5; and then magnetically stirring at 80 rpm at room temperature 25°C for 24 hours;

[0077] (3) The modified polyester-viscose blended fabric obtained in step (2) is immersed in a mixed dispersion of cationic yellow X-5GL (4 mM) and cationic disperse dye Ruby SE-2GF (4.5 mM), the solution pH is 5, the immersion temperature is 100° C., the immersion time is 60 min, and then dried at 60° C. for 30 min, and the immersion-drying operation is repeated 3 times; reduction washing is performed to obtain a dyed polyester-viscose blended fabric.

[0078] The reduction cleaning is as follows: putting the dyed fabric at 40°C, heating it to 80°C at 1.5°C / min and keeping it warm for 30min (ultrasonic power is 100W, ultrasonic reduction cleaning), then washing, dehydrating and drying, wherein the acidic reduction cleaning agent DM-89313.5g / L, soda ash 2.5g / L, and the bath ratio is 1:50.

[0079] The test results of dyed polyester-viscose blended fabrics are: dyeing rate is 75%, color fastness to rubbing: level 2 (dry), level 2 (wet), color fastness to soaping: level 2 for discoloration, level 3 for wool staining, level 2 for cotton staining, color fastness to perspiration: level 2 for discoloration, level 3 for wool staining, level 2 for cotton staining.

[0080] Comparative Example 5:

[0081] (1) The polyester-viscose blended fabric was immersed in a solution containing 0.4 g / L soda ash, 0.4 g / L degreasing agent RG-Y100 and 4 g / L hydrogen peroxide, and then immersed at a constant temperature of 80°C for 50 min, taken out, washed, dried, weighed and set aside, with a bath ratio of 1:70.

[0082] (2) immersing the polyester-viscose blended fabric obtained in step (1) after the impurity removal pretreatment in a mixed solution containing octadecyltrimethylammonium chloride (STAC) (3M) and silane coupling agent K560 (5.25M), the solution pH being 8.5; and then magnetically stirring at 80 rpm at room temperature 25°C for 24 hours;

[0083] (3) The modified polyester-viscose blended fabric obtained in step (2) is immersed in a mixed dispersion of Lanasol Yellow 3G (4 mM) and anionic disperse dye K-1 (4.5 mM), wherein the solution pH is 5, the immersion temperature is 100° C., the immersion time is 60 min, and then dried at 60° C. for 30 min, and the immersion-drying operation is repeated 3 times; reduction cleaning is performed to obtain a dyed polyester-viscose blended fabric.

[0084] The reduction cleaning is as follows: putting the dyed fabric at 40°C, heating it to 80°C at 1.5°C / min and keeping it warm for 30min (ultrasonic power is 100W, ultrasonic reduction cleaning), then washing, dehydrating and drying, wherein the acidic reduction cleaning agent DM-89313.5g / L, soda ash 2.5g / L, and the bath ratio is 1:50.

[0085] The test results of dyed polyester-viscose blended fabrics are: dyeing rate is 85%, color fastness to rubbing: level 3 (dry), level 3 (wet), color fastness to soaping: level 2 for discoloration, level 3 for wool staining, level 3 for cotton staining, color fastness to perspiration: level 2 for discoloration, level 3 for wool staining, level 2 for cotton staining.

[0086] Comparative Example 6:

[0087] (1) The polyester-viscose blended fabric was immersed in a solution containing 0.4 g / L soda ash, 0.4 g / L degreasing agent RG-Y100 and 4 g / L hydrogen peroxide, and then immersed at a constant temperature of 80°C for 50 min, taken out, washed, dried, weighed and set aside, with a bath ratio of 1:70.

[0088] (2) immersing the polyester-viscose blended fabric obtained in step (1) after the impurity removal pretreatment in a mixed solution containing octadecyltrimethylammonium chloride (STAC) (3M) and silane coupling agent K560 (5.25M), the solution pH being 8.5; and then magnetically stirring at 80 rpm at room temperature 25°C for 24 hours;

[0089] (3) The modified polyester-viscose blended fabric obtained in step (2) is immersed in a mixed dispersion of Lanasol yellow CE-01 (4 mM) and cationic disperse dye Ruby SE-2GF (4.5 mM), the solution pH is 5, the immersion temperature is 100° C., the immersion time is 60 min, and then dried at 60° C. for 30 min, and the immersion-drying operation is repeated 3 times; reduction cleaning is performed to obtain a dyed polyester-viscose blended fabric.

[0090] The reduction cleaning is as follows: putting the dyed fabric at 40°C, heating it to 80°C at 1.5°C / min and keeping it warm for 30min (ultrasonic power is 100W, ultrasonic reduction cleaning), then washing, dehydrating and drying, wherein the acidic reduction cleaning agent DM-89313.5g / L, soda ash 2.5g / L, and the bath ratio is 1:50.

[0091] The test results of dyed polyester-viscose blended fabrics are: dyeing rate is 57%, color fastness to rubbing: level 2 (dry), level 2 (wet), color fastness to soaping: level 2 for discoloration, level 2 for wool staining, level 3 for cotton staining, color fastness to perspiration: level 3 for discoloration, level 2 for wool staining, level 3 for cotton staining.

[0092] The embodiments provided above are not intended to limit the scope of the present invention, and the steps described are not intended to limit the execution order thereof. Those skilled in the art may make obvious improvements to the present invention in combination with existing common knowledge, which also fall within the scope of protection defined by the claims of the present invention.

Claims

1. A one-bath dyeing method for polyester-viscose blended fabrics, characterized in that: The steps include: (1) performing impurity removal pretreatment on a polyester-viscose blended fabric to obtain a pretreated polyester-viscose blended fabric; (2) using octadecyltrimethylammonium chloride and a silane coupling agent to modify the polyester-viscose blended fabric after the impurity removal pretreatment in step (1) to obtain a polyester-viscose blended fabric after surface modification; (3) dipping the modified polyester-viscose blended fabric obtained in step (2) in a mixed dispersion of a cationic active dye and a disperse dye, drying, and repeating the dipping-drying operation 2-5 times; performing reduction cleaning, washing, and drying to obtain a dyed polyester-viscose blended fabric.

2. The one-bath dyeing method for polyester-viscose blended fabrics according to claim 1, characterized in that: The impurity removal pretreatment described in step (1) is to immerse the polyester-viscose blended fabric in a solution containing 0.2-8.5g / L soda ash, 0.15-5.5g / L degreasing agent RG-Y100 and 2-70g / L hydrogen peroxide, immerse it at a constant temperature of 70-90°C for 30-120min, then take it out, wash it with water, perform reduction cleaning, wash it with water, dry it, weigh it for later use, and the bath ratio is 1:60-80.

3. The one-bath dyeing method for polyester-viscose blended fabrics according to claim 1, characterized in that: The cationic active dye in step (2) is cationic yellow X-5GL, cationic red X-GRL, cationic blue X-BL, cationic golden yellow X-GL, cationic red X-GTL or cationic blue FGRL, and the disperse dye is anionic disperse dye K-1 or anionic disperse dye K-2, The molecular structure of anionic disperse dye K-1 is: The molecular structure of anionic disperse dye K-2 is:

4. The one-bath dyeing method for polyester-viscose blended fabrics according to any one of claims 1 or 3, characterized in that: The modification described in step (2) is to immerse the polyester-viscose blended fabric after impurity removal pretreatment in a mixed solution containing octadecyltrimethylammonium chloride and a silane coupling agent, the solution pH is 8-10, washed with water, and dried; wherein the concentration of octadecyltrimethylammonium chloride in the mixed solution is 0.25-8.5M; the concentration ratio of octadecyltrimethylammonium chloride to silane coupling agent is 2:3-4, and the concentration of the buffer solution is 0.5-4.5M.

5. The one-bath dyeing method for polyester-viscose blended fabrics according to claim 1, characterized in that: The silane coupling agent described in step (1) is one of vinyl triethoxysilane, vinyl trimethoxysilane, vinyl tri (β-methoxyethoxy) silane, silane coupling agent KH-560, and silane coupling agent KH-570.

6. The one-bath dyeing method for polyester-viscose blended fabrics according to claim 1, characterized in that: In the modification process of step (2), the immersion is carried out at room temperature of 25-45° C. with magnetic stirring at 50-120 rpm for 16-54 hours.

7. The one-bath dyeing method for polyester-viscose blended fabrics according to claim 1, characterized in that In step (3), the concentration of the cationic active dye is 1.5-45 mM, and the concentration of the disperse dye is 2.5-65 mM.

8. The one-bath dyeing method for polyester-viscose blended fabrics according to any one of claims 1 or 7, characterized in that: The immersion temperature in step (3) is 95-125° C. and the immersion time is 30-120 min.

9. The one-bath dyeing method for polyester-viscose blended fabrics according to any one of claims 1 or 7, characterized in that: The pH of the mixed dispersion in step (3) is 4-7.

10. The one-bath dyeing method for polyester-viscose blended fabrics according to any one of claims 1 or 7, characterized in that: The reduction cleaning in step (3) is as follows: placing the dyed fabric at 35-45°C, heating to 40-80°C at a rate of 1.0-2.0°C / min, and keeping the temperature for 5-30min, then washing, dehydrating, and drying, wherein the acidic reduction cleaning agent DM-8931 is 1.5-4.5g / L, soda ash is 2.5-10.5g / L, and the bath ratio is 1:30-50.

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