Dyeing process for polyester-cotton sand washing fabric

Abstract

The invention provides a dyeing process for polyester-cotton sand washing fabric. The dyeing process comprises the following steps: sequentially performing presetting, polyester overflow dyeing, primary reduction cleaning, cotton fiber active dyeing, soaping, secondary reduction cleaning and fastness treatment on the polyester-cotton sand washing fabric to finish dyeing of the polyester-cotton sand washing fabric; wherein dye for polyester overflow dyeing comprises an S-type disperse dye, a dispersing agent and a leveling agent; the reactive dye for reactive dyeing of the cotton fibers comprises a vinyl sulfone reactive dye, a leveling agent and a fiber protective agent. According to the method, dyeing interference of polyester and cotton fibers can be avoided through separated-bath dyeing, the reactive dye is selected to conduct controllable dyeing on the cotton fibers, the controllability of colored light is improved, in addition, dual reduction cleaning and cation fastness treatment are combined, the floating color removal rate of the polyester-cotton sand-washed fabric can be larger than 95%, and the dark color wet friction can reach the fourth level.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of polyester-cotton sand-washed fabric dyeing, in particular to a dyeing process for polyester-cotton sand-washed fabric. BACKGROUND

[0002] Polyester-cotton sand-washed fabric is a kind of textile made of polyester and cotton blending or interweaving and treated by special sand-washing process. It mainly uses cellulase and pumice stone friction to gently etch the surface of the fabric, so as to produce fine and dense nap on the cotton fibers, thereby obtaining soft, fluffy hand feeling and presenting soft and old-fashioned appearance, matte suede effect and excellent drape. It not only retains the wear resistance and wrinkle resistance of polyester, but also has moisture absorption and air permeability of cotton fibers, and is widely used in leisure accessories such as retro-style shirts, coats and pants.

[0003] However, due to the difference in properties of the two fibers and sand-washing damage, the dyeing compatibility of polyester and cotton fibers is poor and the color uniformity is poor, and the "flash color" phenomenon is prone to occur. In addition, sand-washing causes the surface of cotton fibers to produce nap and micro-damage, significantly increases the hiding area of floating color, causes poor wet rubbing fastness and color fading, and also causes dyeing color unevenness after sand-washing treatment.

[0004] Therefore, there is an urgent need for a dyeing process for polyester-cotton sand-washed fabric to solve the above problems. SUMMARY

[0005] (I) Technical problems solved

[0006] In view of the deficiencies of the prior art, the present application provides a dyeing process for polyester-cotton sand-washed fabric to solve the problems raised in the background.

[0007] (II) Technical solutions

[0008] To achieve the above purpose, the present application is realized by the following technical solutions:

[0009] According to the first aspect of the present application, a dyeing process for polyester-cotton sand-washed fabric is provided, comprising the following steps:

[0010] The polyester-cotton sand-washed fabric is sequentially pre-shaped, overflow dyed with polyester, once reduced and washed, cotton fiber is dyed with reactive dye, soaped, twice reduced and washed, and fastness treated to complete the dyeing of polyester-cotton sand-washed fabric;

[0011] The dye of the polyester overflow dyeing includes S-type disperse dye, dispersing agent and leveling agent;

[0012] The reactive dye of the cotton fiber reactive dyeing includes ethylene sulfone reactive dye, leveling agent and fiber protective agent.

[0013] Preferably, the pre-forming temperature is 190–195°C, and the time is 30–40 seconds. This invention removes wrinkles from polyester-cotton sand-washed fabrics through the pre-forming step, stabilizing the fabric's shape and reducing instability during subsequent dyeing processes.

[0014] Preferably, the conditions for polyester overflow dyeing are as follows: liquor ratio of 1:8 to 12, pH of 4.5 to 5.5, dyeing temperature of 130 to 135°C, and dyeing time of 30 to 50 minutes. Dyeing polyester under high temperature conditions can prevent secondary staining during subsequent cotton dyeing processes.

[0015] Preferably, in the polyester overflow dyeing process, the amount of the S-type disperse dye is 0.1-15 g / L, the amount of the dispersant is 0.5-1.5 g / L, and the amount of the leveling agent is 1.0-2.0 g / L.

[0016] Specifically, the dispersant can be selected from sodium lignosulfonate, and the leveling agent can be selected from fatty alcohol polyoxyethylene ether.

[0017] More specifically, the amount of S-type disperse dye added is as follows:

[0018] When the dyeing depth is less than 0.2%, the amount of the S-type disperse dye used is 0.1-0.5 g / L;

[0019] When the dyeing depth is 0.2-0.5%, the amount of the S-type disperse dye used is 0.5-2 g / L;

[0020] When the dyeing depth is 0.5-1%, the amount of the S-type disperse dye used is 2.0-8.0 g / L;

[0021] When the dyeing depth is greater than 1%, the amount of the S-type disperse dye used is 8.0% to 15.0%.

[0022] Preferably, the conditions for the primary reduction cleaning are as follows: the temperature for the primary reduction cleaning is 75–85°C, the time for the primary reduction cleaning is 20–30 minutes, and the reducing cleaning agent is 2 g / L caustic soda and 2 g / L sodium hydrosulfite. This primary reduction cleaning can remove the floating dye from the polyester surface and provide a clean base for subsequent cotton fiber dyeing.

[0023] Preferably, the specific steps of the reactive dyeing of cotton fibers are as follows: under a liquor ratio of 1:10-12, the temperature is increased to 60°C at room temperature at a rate of 1°C / min, electrolyte is added, and then alkali is added to adjust the pH to 10.5-11, followed by color fixing for 50-60 minutes. Dyeing cotton fibers under low-temperature conditions can reduce cotton fiber hydrolysis and, through the dyeing of cotton fibers with vinyl sulfone reactive dyes, reduce the color difference with polyester.

[0024] Preferably, the electrolyte comprises a mixture of sodium sulfate and sodium chloride, and the amount of the electrolyte is 20-80 g / L.

[0025] Preferably, in the reactive dyeing of the cotton fibers, the amount of vinyl sulfone reactive dye is 3.0-6.0 g / L, the amount of leveling agent is 0.5-1.5%, and the amount of fiber protectant is 1.0-2.0%.

[0026] Specifically, fatty alcohol polyoxyethylene ether can be selected as the leveling agent, and polysiloxane derivatives can be selected as the cellulose protectant.

[0027] Preferably, the soaping conditions are as follows: temperature 95-100℃, time 15-20 min, and soaping agent dosage 1-2 g / L;

[0028] The conditions for the secondary reduction cleaning are as follows: the temperature of the secondary reduction cleaning is 75-85℃, the time of the secondary reduction cleaning is 20-30 minutes, and the reducing cleaning agent is 2g / L caustic soda and 2g / L sodium hydrosulfite.

[0029] Preferably, the fastness treatment conditions are: fastness treatment at 60°C for 20 min in a cationic polymer.

[0030] Beneficial effects

[0031] This invention provides a dyeing process for polyester-cotton sand-washed fabrics. It has the following beneficial effects:

[0032] (1) This solution provides a dyeing process for polyester-cotton sand-washed fabrics. By using separate bath dyeing, the dyeing interference between polyester and cotton fibers can be avoided. Reactive dyes are selected to control the dyeing of cotton fibers, thereby improving the controllability of color. In addition, by combining double reduction washing and cationic fastness treatment, the floating color removal rate of polyester-cotton sand-washed fabrics can be greater than 95%, and the wet rubbing of dark colors can reach level four.

[0033] (2) This solution provides a dyeing process for polyester-cotton sand-washed fabrics, which combines pre-shaped anti-wrinkle with low-temperature cotton dyeing and fiber protectant, resulting in a cotton strength retention rate of more than 85%. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with embodiments. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer are followed. Reagents or instruments used, unless otherwise specified, are all commercially available products.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] The S-type disperse dyes used in this embodiment of the invention were purchased from Zhejiang Runtu Co., Ltd. as disperse orange, disperse red, and disperse deep blue.

[0037] The dispersant was sodium lignosulfonate manufactured by Maclean Company;

[0038] The leveling agent was purchased from Shandong Longhui Chemical Co., Ltd. as fatty alcohol polyoxyethylene ether.

[0039] The vinyl sulfone reactive dye was purchased from Haian Petrochemical.

[0040] The cellulose protectant was purchased from polydimethylsiloxane produced by Huachen New Materials.

[0041] The soap detergent was purchased from Guangzhou Qiantai Chemical's low-temperature soap-washing enzyme.

[0042] The cationic polymer selected is polyquaternary ammonium salt-5.

[0043] To better illustrate the content of this invention, the following description is provided in conjunction with specific embodiments.

[0044] Example 1

[0045] A dyeing process for polyester-cotton sand-washed fabrics includes the following steps:

[0046] Step 1: Use a hot air tenter frame to pre-set the polyester-cotton sand-washed fabric. Set the pre-setting temperature to 190℃, the speed of the hot air tenter frame to 20m / min, and the pre-setting time of the polyester-cotton sand-washed fabric to 30s.

[0047] Step 2: Place the pretreated polyester-cotton sand-washed fabric in an overflow dyeing machine. Add water to the overflow dyeing machine at a liquor ratio of 1:10. Add 1 g / L of disperse deep blue, 1 g / L of sodium lignosulfonate and 1.5 g / L of fatty alcohol polyoxyethylene ether at 40℃. Add acetic acid to adjust the pH of the dyeing liquor to 5.0. First, raise the temperature to 80℃ at a rate of 1℃ / min, and then raise it to 130℃ at a rate of 1℃ / min. Keep the temperature for dyeing for 40 minutes, and then lower the temperature to 80℃ at a rate of 2℃ / min. Drain the liquor, wash with water, and complete the polyester dyeing.

[0048] Step 3: Add 2g / L of caustic soda and 2g / L of sodium hydrosulfite, and perform reduction cleaning at 80℃ for 20 minutes;

[0049] Step 4: Place the polyester-cotton sand-washed fabric in an overflow dyeing machine. Add water to the overflow dyeing machine at a liquor ratio of 1:10. Add 4.0 g / L of vinyl sulfone reactive dye, 1.0 g / L of fatty alcohol polyoxyethylene ether, and 1.0 g / L of polydimethylsiloxane at 40°C. First, add 40 g / L of sodium sulfate and sodium chloride in three portions, and circulate for 10 minutes. Then, add soda ash in two portions to adjust the pH of the reactive dyeing solution to 11. Raise the temperature to 60°C at a rate of 1°C / min, and keep it at this temperature for 40 minutes to fix the color. Then drain the solution.

[0050] Step 5: Introduce 1g / L of low-temperature soaping agent, heat to 95℃, soap for 15 minutes, and then rinse with 80℃ hot water.

[0051] Step 6: Add 2g / L of caustic soda and 2g / L of sodium hydrosulfite, and perform reduction cleaning at 80℃ for 20 minutes;

[0052] Step 7: Finally, inject 2.0 g / L of polyquaternium-5, treat at 50℃ for 20 min, dehydrate and open the fabric to complete the dyeing process.

[0053] Example 2

[0054] A dyeing process for polyester-cotton sand-washed fabrics includes the following steps:

[0055] Step 1: Use a hot air tenter frame to pre-set the polyester-cotton sand-washed fabric. Set the pre-setting temperature to 190℃, the speed of the hot air tenter frame to 20m / min, and the pre-setting time of the polyester-cotton sand-washed fabric to 30s.

[0056] Step 2: Place the pretreated polyester-cotton sand-washed fabric in an overflow dyeing machine. Add water to the overflow dyeing machine at a liquor ratio of 1:10. Add 1 g / L of disperse red jade, 0.5 g / L of sodium lignosulfonate and 1.0 g / L of fatty alcohol polyoxyethylene ether at 40℃. Add acetic acid to adjust the pH of the dyeing liquor to 5.0. First, raise the temperature to 80℃ at a rate of 1℃ / min, and then raise it to 135℃ at a rate of 1℃ / min. Keep the temperature for dyeing for 50 minutes, and then lower the temperature to 80℃ at a rate of 2℃ / min. Drain the liquor, wash with water, and complete the polyester dyeing.

[0057] Step 3: Add 2g / L of caustic soda and 2g / L of sodium hydrosulfite, and perform reduction cleaning at 80℃ for 20 minutes;

[0058] Step 4: Place the polyester-cotton sand-washed fabric in an overflow dyeing machine. Add water to the overflow dyeing machine at a liquor ratio of 1:10. Add 4.0 g / L of vinyl sulfone reactive dye, 0.5 g / L of fatty alcohol polyoxyethylene ether, and 1.0 g / L of polydimethylsiloxane at 40°C. First, add 40 g / L of sodium sulfate and sodium chloride in three portions, and circulate for 10 min. Then, add soda ash in two portions to adjust the pH of the reactive dyeing solution to 11. Raise the temperature to 60°C at a rate of 1°C / min, and keep it at this temperature for 40 min to fix the color. Then drain the solution.

[0059] Step 5: Introduce 1g / L of low-temperature soaping agent, heat to 95℃, soap for 15 minutes, and then rinse with 80℃ hot water.

[0060] Step 6: Add 2g / L of caustic soda and 2g / L of sodium hydrosulfite, and perform reduction cleaning at 80℃ for 20 minutes;

[0061] Step 7: Finally, inject 2.0 g / L of polyquaternium-5, treat at 50℃ for 20 min, dehydrate and open the fabric to complete the dyeing process.

[0062] Example 3

[0063] A dyeing process for polyester-cotton sand-washed fabrics includes the following steps:

[0064] Step 1: Use a hot air tenter frame to pre-set the polyester-cotton sand-washed fabric. Set the pre-setting temperature to 190℃, the speed of the hot air tenter frame to 20m / min, and the pre-setting time of the polyester-cotton sand-washed fabric to 30s.

[0065] Step 2: Place the pretreated polyester-cotton sand-washed fabric in an overflow dyeing machine. Add water to the overflow dyeing machine at a liquor ratio of 1:10. Add 1 g / L of disperse red jade, 1.5 g / L of sodium lignosulfonate and 2.0 g / L of fatty alcohol polyoxyethylene ether at 40℃. Add acetic acid to adjust the pH of the dyeing liquor to 5.0. First, raise the temperature to 80℃ at a rate of 1℃ / min, and then raise it to 130℃ at a rate of 1℃ / min. Keep the temperature for dyeing for 50 minutes, and then lower the temperature to 80℃ at a rate of 2℃ / min. Drain the liquor, wash with water, and complete the polyester dyeing.

[0066] Step 3: Add 2g / L of caustic soda and 2g / L of sodium hydrosulfite, and perform reduction cleaning at 80℃ for 20 minutes;

[0067] Step 4: Place the polyester-cotton sand-washed fabric in an overflow dyeing machine. Add water to the overflow dyeing machine at a liquor ratio of 1:10. Add 4.0 g / L of vinyl sulfone reactive dye, 1.5 g / L of fatty alcohol polyoxyethylene ether, and 2.0 g / L of polydimethylsiloxane at 40°C. First, add 40 g / L of sodium sulfate and sodium chloride in three portions, and circulate for 10 minutes. Then, add soda ash in two portions to adjust the pH of the reactive dyeing solution to 11. Raise the temperature to 60°C at a rate of 1°C / min, and keep it at this temperature for 40 minutes to fix the color. Then drain the solution.

[0068] Step 5: Introduce 1g / L of low-temperature soaping agent, heat to 95℃, soap for 15 minutes, and then rinse with 80℃ hot water.

[0069] Step 6: Add 2g / L of caustic soda and 2g / L of sodium hydrosulfite, and perform reduction cleaning at 80℃ for 20 minutes;

[0070] Step 7: Finally, inject 2.0 g / L of polyquaternium-5, treat at 50℃ for 20 min, dehydrate and open the fabric to complete the dyeing process.

[0071] Performance testing

[0072] The color fastness to soap washing, color fastness to soap staining, color fastness to dry rubbing, color fastness to wet rubbing, color difference value, and fabric surface effect of the dyed polyester-cotton sand-washed fabrics of Examples 1 to 3 were tested respectively. The test results are shown in Table 1.

[0073] Table 1

[0074] Test Example 1 Example 2 Example 3 Fastness to soaping discoloration 4-5 4-5 4-5 Fastness to soaping staining 4-5 4-5 4-5 Fastness to dry rubbing 4-5 4-5 4-5 Fastness to wet rubbing 4 4 4-5 Delta E value 0.75 0.49 0.63 Fabric appearance Even Even Even Even

[0075] This application improves the smoothness of the fabric surface through pretreatment, and the combination of split dyeing and specific post-treatment processes can effectively remove the floating color on the surface of polyester and cotton fibers, and the color fastness can reach level 4-5. In the split dyeing process, specific auxiliaries are selected to improve the uniform diffusion or fixation of dye, reduce the dye on the surface, and result in low color difference value. The fabric has a soft hand feel and a smooth surface.

[0076] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dyeing process for polyester-cotton sand-washed fabrics, characterized in that: Includes the following steps: The polyester-cotton sand-washed fabric is pre-shaped, polyester overflow dyeing, first reduction washing, cotton fiber reactive dyeing, soap washing, second reduction washing and fastness treatment to complete the dyeing of the polyester-cotton sand-washed fabric. The dyes used for polyester overflow dyeing include S-type disperse dyes, dispersants, and leveling agents. The reactive dyes used in the reactive dyeing of cotton fibers include vinyl sulfone reactive dyes, leveling agents, and fiber protectants.

2. The dyeing process for polyester-cotton sand-washed fabric according to claim 1, characterized in that: The predetermined temperature is 190–195°C, and the time is 30–40 seconds.

3. The dyeing process for polyester-cotton sand-washed fabric according to claim 1, characterized in that: The conditions for polyester overflow dyeing are as follows: liquor ratio of 1:8 to 12, pH of 4.5 to 5.5, dyeing temperature of 130 to 135°C, and dyeing time of 30 to 50 minutes.

4. The dyeing process for polyester-cotton sand-washed fabric according to claim 1, characterized in that: In the polyester overflow dyeing process, the amount of S-type disperse dye used is 0.1-15 g / L, the amount of dispersant used is 0.5-1.5 g / L, and the amount of leveling agent used is 1.0-2.0 g / L.

5. The dyeing process for polyester-cotton sand-washed fabric according to claim 1, characterized in that: The conditions for the first reduction cleaning are as follows: the temperature of the first reduction cleaning is 75-85℃, the time of the first reduction cleaning is 20-30min, and the reduction cleaning agent is 2g / L of caustic soda and 2g / L of sodium hydrosulfite.

6. The dyeing process for polyester-cotton sand-washed fabric according to claim 1, characterized in that: The specific steps of the reactive dyeing of cotton fibers are as follows: under the condition of a liquor ratio of 1:10 to 12, the temperature is raised to 60°C at room temperature at a heating rate of 1°C / min, electrolytes are added, and then alkali is added to adjust the pH to 10.5 to 11, and the color is fixed for 50 to 60 minutes.

7. The dyeing process for polyester-cotton sand-washed fabric according to claim 6, characterized in that: The electrolyte comprises a mixture of sodium sulfate and sodium chloride, and the amount of the electrolyte used is 20-80 g / L.

8. The dyeing process for polyester-cotton sand-washed fabric according to claim 1, characterized in that: In the reactive dyeing of cotton fibers, the amount of vinyl sulfone reactive dye is 3.0-6.0 g / L, the amount of leveling agent is 0.5-1.5%, and the amount of fiber protectant is 1.0-2.0%.

9. The dyeing process for polyester-cotton sand-washed fabric according to claim 1, characterized in that: The soaping conditions are as follows: temperature 95-100℃, time 15-20min, and soaping agent dosage 1-2g / L. The conditions for the secondary reduction cleaning are as follows: the temperature of the secondary reduction cleaning is 75-85℃, the time of the secondary reduction cleaning is 20-30 minutes, and the reducing cleaning agent is 2g / L of caustic soda and 2g / L of sodium hydrosulfite.

10. The dyeing process for polyester-cotton sand-washed fabric according to claim 1, characterized in that: The fastness treatment conditions are as follows: fastness treatment at 60°C for 20 min in a cationic polymer.