Wet steaming dyeing method of cotton and polylactic acid blended fabric

Abstract

The invention belongs to the technical field of textile dyeing, and particularly relates to a wet steaming dyeing method of a cotton and polylactic acid blended fabric. According to the invention, the cotton and polylactic acid blended fabric is subjected to roll compacting after being dipped in a padding dyeing solution, a padding dyeing piece is obtained, and dipping and roll compacting are carried out once; the padding dyeing piece is subjected to steaming color fixation, and a steaming color fixation treatment piece is obtained; and carrying out post-treatment on the steaming color fixing treatment piece. The wet steaming dyeing method provided by the invention is simple in process, short in flow, less in used equipment, low in energy consumption, free of migration and high in dyeing quality, and the dyed fabric is good in dye permeability, uniformity and flatness. All color fastness indexes meet the standard requirements. The dyeing wastewater is less, and the method is environment-friendly.

Description

Technical Field

[0001] The invention belongs to the technical field of textile dyeing, and particularly relates to a wet steam dyeing method for a cotton and polylactic acid blended fabric. Background Art

[0002] Polylactic acid (PLA) fiber is made from agricultural products such as corn and grains, which are fermented into lactic acid and then synthesized. It not only has excellent physical properties and wearability, but its waste can be completely decomposed into carbon dioxide and water in nature, and will not pollute the environment. Therefore, it is called one of the new environmentally friendly fibers that the industry is paying attention to.

[0003] PLA fibers possess a silky luster and pleasant feel, along with the characteristics of common synthetic fibers, such as similar strength and elongation, excellent wrinkle resistance and morphological stability, excellent antibacterial and mildew resistance, good moisture absorption and perspiration wicking, quick-drying properties, and a high strain recovery rate. Consequently, garments made with PLA fibers exhibit excellent drape and feel, providing comfort and making them a premium material for high-end casual wear. Currently, cotton-PLA blended fabrics not only maintain their biodegradability but also further demonstrate the unique advantages of PLA fiber fabrics.

[0004] However, polylactic acid fiber is not resistant to high temperature (130 ℃) and alkali. When it encounters high temperature or alkali, the strength of the fabric is significantly reduced and it is difficult to color. Currently, the dyeing process of cotton and polylactic acid blended fabrics is complicated, inefficient and has poor dyeing quality. Summary of the Invention

[0005] The present invention aims to provide a wet steam dyeing method for a cotton and polylactic acid blended fabric. The wet steam dyeing method provided by the present invention has simple procedures, high efficiency, high dyeing quality, and various color fastness indicators meet standard requirements.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a wet steam dyeing method for a cotton and polylactic acid blended fabric, comprising the following steps:

[0008] The cotton and polylactic acid blended fabric is immersed in a padding solution and then padded to obtain a pad-dyed piece, wherein the padding solution comprises a disperse dye, a reactive dye and water, and the dipping and padding are both performed once;

[0009] Steaming and fixing the pad-dyed piece to obtain a steam-fixed piece;

[0010] The steam-fixed treated piece is subjected to post-treatment.

[0011] Preferably, in the padding solution: the mass concentration of the disperse dye is 0.05 to 25 g / L, and the mass concentration of the reactive dye is 0.05 to 20 g / L;

[0012] The padding solution further comprises a dispersant, a penetrant and urea, wherein the mass concentration of the dispersant is 0.295 to 0.305 g / L, the mass concentration of the penetrant is 0.245 to 0.255 g / L, and the mass concentration of the urea is 9.5 to 10.5 g / L.

[0013] Preferably, the temperature of the padding solution is 25-30°C.

[0014] Preferably, the rolling margin is 60 to 80%.

[0015] Preferably, the rolling is performed on a rolling mill at a speed of 10 to 45 m / min.

[0016] Preferably, the steaming and fixing is carried out in a steam box; the temperature of the steaming and fixing is 102-105° C., and the time is 2-3 minutes.

[0017] Preferably, the cotton and polylactic acid blended fabric is pre-treated before impregnation to obtain a pre-treated cotton and polylactic acid blended fabric;

[0018] The pretreatment includes low-temperature enzyme desizing treatment, and the temperature of the low-temperature enzyme desizing treatment is 50-55°C.

[0019] Preferably, the capillary effect of the cotton and polylactic acid blended fabric after the pretreatment is ≥10cm / 30min, and the pH value of the fabric surface is 6.5-7.5.

[0020] Preferably, the cotton and polylactic acid blended fabric is woven from warp yarn and weft yarn, the warp yarn is formed by cotton fiber, the specification of the warp yarn is 40S, the weft yarn is formed by cotton fiber and polylactic acid fiber, the specification of the weft yarn is 75D / 72F.

[0021] Preferably, the mass content of the cotton fiber in the cotton and polylactic acid blended fabric is 65-70%, and the mass content of the polylactic acid fiber is 30-35%.

[0022] The present invention provides a wet-steam dyeing method for a cotton and polylactic acid blended fabric, comprising the following steps: impregnating the cotton and polylactic acid blended fabric with a padding solution comprising a disperse dye, a reactive dye, and water, followed by padding to obtain a pad-dyed part, wherein the impregnation and padding are performed in a single step; steam-steaming the pad-dyed part to obtain a steam-fixed part; and post-treating the steam-fixed part. The present invention employs a one-step dyeing method combining a single impregnation and a single padding, significantly simplifying the dyeing process, improving dyeing efficiency, and reducing energy consumption. The present invention also employs a steam-fixing method, using contactless steam to fix and dry the pad-dyed part, thus avoiding overheating and reduced fabric strength. The wet-steam dyeing method provided by the present invention features a simple process, a short flow, minimal equipment, reduced energy consumption, no migration, high dyeing quality, and excellent dye penetration, uniformity, and smoothness of the dyed fabric. All color fastness indicators meet standard requirements. Dyeing wastewater is minimal, making it environmentally friendly.

[0023] Furthermore, in the present invention, the cotton and polylactic acid blended fabric is pretreated before impregnation to obtain a pretreated cotton and polylactic acid blended fabric. The pretreated cotton and polylactic acid blended fabric has a capillary effect of ≥10 cm / 30 min and a surface pH of 6.5 to 7.5. The pretreatment step optimizes the capillary effect and surface pH of the blended fabric, thereby improving the dyeing effect of the fabric in the pad dye solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a physical picture of the dyed cotton and polylactic acid blended fabric obtained by the wet steam dyeing method in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The present invention provides a wet steam dyeing method for a cotton and polylactic acid blended fabric, comprising the following steps:

[0026] The cotton and polylactic acid blended fabric is immersed in a padding solution and then padded to obtain a pad-dyed piece, wherein the padding solution comprises a disperse dye, a reactive dye and water, and the dipping and padding are both performed once;

[0027] Steaming and fixing the pad-dyed piece to obtain a steam-fixed piece;

[0028] The steam-fixed treated piece is subjected to post-treatment.

[0029] In the present invention, unless otherwise specified, all preparation raw materials / components are commercially available products well known to those skilled in the art.

[0030] The invention soaks the cotton and polylactic acid blended fabric in a padding solution and then performs padding to obtain a pad-dyed piece. The padding solution comprises disperse dyes, reactive dyes and water. The soaking and padding are both performed once.

[0031] In the present invention, the cotton and polylactic acid blended fabric is preferably woven from warp yarns and weft yarns. The warp yarns are preferably formed from cotton fibers. The warp yarns are preferably 40S in gauge. The weft yarns are preferably formed from cotton fibers and polylactic acid fibers. The weft yarns are preferably 75D / 72F in gauge.

[0032] In the present invention, the mass content of cotton fiber in the cotton and polylactic acid blended fabric is preferably 65-70%, and in the embodiment it can be 70%. The mass content of polylactic acid fiber in the cotton and polylactic acid blended fabric is preferably 30-35%, and in the embodiment it can be 30%.

[0033] In the present invention, the cotton and polylactic acid blended fabric is preferably pretreated before impregnation to obtain a pretreated cotton and polylactic acid blended fabric. The pretreated cotton and polylactic acid blended fabric is then subjected to the impregnation. In the present invention, the pretreatment preferably includes a low-temperature enzymatic desizing treatment, and the temperature of the low-temperature enzymatic desizing treatment is preferably 50-55°C.

[0034] In the present invention, the capillary effect of the pre-treated cotton and polylactic acid blended fabric is preferably ≥10 cm / 30 min, and the pH value of the fabric surface is preferably 6.5-7.5, and in the embodiment can be 7 (neutral).

[0035] In the present invention, the disperse dye preferably includes Anoky disperse dye and / or Zhejiang Longsheng disperse dye. The Anoky disperse dye preferably includes one or more of Anoklon ERD red dye, Anoklon ERD blue dye and Anoklon ERD yellow-red dye. The Zhejiang Longsheng disperse dye preferably includes one or more of Zhejiang Longsheng S-4BL ruby, Zhejiang Longsheng S-RL orange and Zhejiang Longsheng H-GL dark blue. The disperse dye in the embodiment can be Anoklon ERD red dye, Anoklon ERD blue dye and Anoklon ERD yellow-red dye. In the present invention, the disperse dye is preferably ground before use.

[0036] In the present invention, the mass concentration of the disperse dye in the padding solution is preferably 0.05 to 25 g / L.

[0037] In the present invention, the reactive dyes preferably include Shanghai Yayun's Agarsite NF series reactive dyes and / or Huntsman's high-solar SE series reactive dyes. The Shanghai Yayun's Agarsite NF series reactive dyes preferably include one or more of NF-GR yellow dye, NF-3B red dye, and NF-BN blue dye. In the embodiments, the reactive dyes may be NF-GR yellow dye, NF-3B red dye, or NF-BN blue dye. In the present invention, the mass concentration of the reactive dye in the padding solution is preferably 0.05 to 20 g / L.

[0038] In the present invention, the padding liquor preferably further comprises a dispersant, a penetrant, and urea. The dispersant is preferably Shanghai Daxiang Dispersant T-150. The penetrant is preferably FFA penetrant from Yayun Company. The mass concentration of the dispersant in the padding liquor is preferably 0.295 to 0.305 g / L. The mass concentration of the penetrant in the padding liquor is preferably 0.245 to 0.255 g / L. The mass concentration of urea in the padding liquor is preferably 9.5 to 10.5 g / L.

[0039] In the present invention, the temperature of the padding solution is preferably 25-30°C.

[0040] In the present invention, the padding solution is preferably located in a dye tank. The padding solution is preferably obtained by mixing the disperse dye solution and the reactive dye solution. The volume ratio of the disperse dye solution to the reactive dye solution is preferably 1:1.

[0041] In the present invention, the disperse dye solution preferably includes disperse dye, dispersant and water. The mass concentration of the disperse dye in the disperse dye solution in the material tank is preferably 0.1 to 50 g / L. In the present invention, the disperse dye in the disperse dye solution is preferably one or more, and in an embodiment, it can be three, including red disperse dye, blue disperse dye and yellow disperse dye. The mass concentration of the disperse dye in the disperse dye solution is the mass concentration of any one disperse dye in the disperse dye solution.

[0042] In embodiments of the present invention, the disperse dyes may be Anoklon® ERD Red, Anoklon® ERD Blue, and Anoklon® ERD Yellow-Red. The mass concentration of Anoklon® ERD Red, Anoklon® ERD Blue, and Anoklon® ERD Yellow in the disperse dye solution is 0.27 g / L, 8.60 g / L, and 4.87 g / L, respectively. The mass concentration of the dispersant in the disperse dye solution is preferably 0.59 to 0.61 g / L, and in embodiments may be 0.6 g / L.

[0043] In the present invention, the reactive dye solution preferably includes a reactive dye, a penetrant, urea, and water. The mass concentration of the reactive dye in the reactive dye solution in the material tank is preferably 0.1 to 40 g / L. In the present invention, the reactive dye in the reactive dye solution is preferably one or more, and in an embodiment, can be three, including a yellow reactive dye, a red reactive dye, and a blue reactive dye. The mass concentration of the reactive dye in the reactive dye solution is the mass concentration of any one reactive dye in the reactive dye solution.

[0044] In an embodiment of the present invention, the reactive dyes are preferably NF-GR yellow dye, NF-3B red dye, and NF-BN blue dye. The mass concentration of NF-GR yellow dye in the reactive dye solution is preferably 3.53 g / L, the mass concentration of NF-3B red dye is 0.13 g / L, and the mass concentration of NF-BN blue dye is 6.87 g / L. The mass concentration of the penetrant in the reactive dye solution is preferably 0.49 to 0.51 g / L, and in an embodiment, it can be 0.5 g / L. The mass concentration of urea in the reactive dye solution is preferably 19 to 21 g / L, and in an embodiment, it can be 20 g / L.

[0045] In the present invention, the disperse dye solution and the reactive dye solution are preferably pumped from the material mixing tank into the dye bath tank at a volume ratio of 1:1 using a pump to obtain a padding dye liquor. The pre-treated cotton and polylactic acid blended fabric is then passed through a fabric feeding device into a padder, immersed once in the padding dye liquor, and then pressed once using the padder.

[0046] In the present invention, the rolling ratio of the rolling is preferably 60 to 80%, more preferably 65 to 75%. The rolling is performed on a rolling mill, and the vehicle speed is preferably 10 to 45 m / min, more preferably 15 to 30 m / min. The present invention preferably controls the rolling ratio of the rolling to obtain a dyed fabric product with uniform dyeing. Excessively high or low rolling ratios of the rolling will lead to poor dyeing uniformity. At the same time, by controlling the vehicle speed within the above range, the present invention can improve dyeing quality, including dye penetration and dyeing uniformity of the dyed fabric.

[0047] After obtaining the pad-dyed part, the present invention performs steaming to fix the pad-dyed part to obtain a steam-fixed part. In the present invention, the steaming to fix the part is preferably performed in a steamer. The steaming to fix the part is preferably performed using steam for drying and fixing. The steaming to fix the part is preferably performed at a temperature of 102-105°C and for a time of 2-3 minutes.

[0048] After obtaining the steaming and fixing treatment piece, the present application carries out post-treatment on the steaming and fixing treatment piece to complete wet steaming dyeing. In the present application, the post-treatment preferably comprises first water washing, soaping and second water washing. In the present application, the soaping uses soap water or laundry liquid water, and the time of the soaping is preferably 60s.

[0049] In summary, the wet steaming dyeing method of the cotton and polylactic acid blended fabric provided by the present application is to once immerse in the dyeing liquid, then once press, then steam, and finally post-treat. The method provided by the present application has simple process, short flow, less equipment, reduced energy consumption, no migration, high dyeing quality, good penetration, uniformity and flatness of the dyed fabric. The method provided by the present application has less dyeing wastewater and is friendly to the environment.

[0050] The fastness indexes of the dyed fabric are as follows: original change: 4-5, white staining: 4-5, dry rubbing: 3-4, wet rubbing: 3-4, sunlight: 3, all of which meet the standard requirements.

[0051] In order to further illustrate the present application, the technical solutions provided by the present application are described in detail below in combination with examples, but they should not be understood as limiting the protection scope of the present application.

[0052] Example 1

[0053] The present embodiment provides a wet steaming dyeing method of a cotton and polylactic acid blended fabric, wherein the cotton and polylactic acid blended fabric is woven by warp yarn and weft yarn, and the fabric specification is that the warp yarn is formed by cotton fiber, the specification of the warp yarn is 40S, the weft yarn is formed by cotton fiber and polylactic acid fiber, the specification of the weft yarn is 75D / 72F, the mass content of the cotton fiber in the cotton and polylactic acid blended fabric is 65%, and the mass content of the PLA fiber is 35%. The method specifically comprises the following steps:

[0054] (1) The cotton and polylactic acid blended fabric in the present embodiment is pretreated, and the pretreatment comprises low-temperature enzyme desizing treatment, and the treatment temperature is 50-55℃, to obtain the pretreated cotton and polylactic acid blended fabric, the capillary effect is ≥10cm / 30min, and the fabric surface pH value is 7.

[0055] (2) Select Shanghai Yayun Company Yage Saite NF series reactive dyes, and weigh NF-GR yellow dye, NF-3B red dye and NF-BN blue dye;

[0056] (3) The active dye in step (2) is uniformly dissolved in water in a chemical tank to obtain a dye solution, and then the FFA penetrant and urea of ​​Shanghai Yayun Company are dissolved in the dye solution to obtain a reactive dye solution, wherein the reactive dye solution obtained in the chemical tank has the following contents: the mass concentration of NF-GR yellow dye is 3.53 g / L, the mass concentration of NF-3B red dye is 0.13 g / L, the mass concentration of NF-BN blue dye is 6.87 g / L, the mass concentration of the penetrant is 0.5 g / L, and the mass concentration of urea is 20 g / L;

[0057] (4) Select disperse dyes, weigh Anoklon ERD red dye, Anoklon ERD blue dye, and Anoklon ERD yellow, and then grind them;

[0058] (5) The disperse dye in step (4) is uniformly dissolved in water in a chemical tank to obtain a dye solution; then Shanghai Daxiang dispersant T-150 is dissolved in the dye solution to obtain a disperse dye solution, wherein the disperse dye solution obtained in the chemical tank has the following contents: the mass concentration of Anoklon ERD red dye is 0.27 g / L, the mass concentration of Anoklon ERD blue dye is 8.60 g / L, the mass concentration of Anoklon ERD yellow is 4.87 g / L, and the mass concentration of the dispersant is 0.6 g / L.

[0059] (6) using a proportional pump, pumping equal volumes of the reactive dye solution obtained in step (3) and the disperse dye solution obtained in step (5) into a dye bath to obtain a padding solution, wherein the volume of the padding solution in the dye bath is 40 L, the liquid level of the padding solution is kept stable, and the temperature of the padding solution is 25 to 30° C.

[0060] (7) The cotton and polylactic acid blended fabric with a wool effect of ≥10cm / 30min after pretreatment and a surface pH value of 7 is immersed in the padding dyeing solution once, and then rolled once with a padder, with a rolling rate of 70% and a speed of 40m / min.

[0061] (8) The fabric after dipping and rolling in step (7) is sent into a steamer and steamed at 102°C for 3 minutes to fix the color.

[0062] (9) The steam-fixed fabric is washed with water, boiled with soap (soap water or laundry detergent water, 60s), and then washed with water to complete the dyeing.

[0063] Figure 1 This is a physical picture of the dyed cotton and polylactic acid blended fabric obtained by the wet steam dyeing method in an embodiment of the present invention.

[0064] The color fastness indexes of the fabric dyed in this embodiment are: original change: 4, white staining: 4, dry rubbing: 3-4, wet rubbing: 3-4, and sun exposure: 3, all of which meet the standard requirements (GB / T3920-2008).

[0065] As can be seen from the above examples, the wet steam dyeing method for cotton and polylactic acid blended fabrics provided by the present invention comprises a single immersion in a padding solution, followed by a single padding, steaming, and finally post-treatment. The method provided by the present invention has a simple process, a short flow, requires less equipment, reduces energy consumption, eliminates migration, and achieves high dyeing quality, with good dye penetration, uniformity, and smoothness of the dyed fabric. It also produces less dyeing wastewater and is environmentally friendly.

[0066] Although the above embodiment provides a detailed description of the present invention, it is only a part of the embodiments of the present invention, not all of the embodiments. Other embodiments can be obtained based on this embodiment without creativity, and these embodiments all fall within the scope of protection of the present invention.

Claims

1. A wet steam dyeing method for a cotton and polylactic acid blended fabric, characterized in that: The following steps are involved: The cotton and polylactic acid blended fabric is immersed in a padding solution and then padded to obtain a pad-dyed piece, wherein the padding solution comprises a disperse dye, a reactive dye and water, and the dipping and padding are both performed once; Steaming and fixing the pad-dyed piece to obtain a steam-fixed piece; The steam-fixed treated piece is subjected to post-treatment.

2. wet steam dyeing method according to claim 1, is characterized in that, In the padding solution, the mass concentration of the disperse dye is 0.05 to 25 g / L, and the mass concentration of the reactive dye is 0.05 to 20 g / L; The padding solution further comprises a dispersant, a penetrant and urea, wherein the mass concentration of the dispersant is 0.295 to 0.305 g / L, the mass concentration of the penetrant is 0.245 to 0.255 g / L, and the mass concentration of the urea is 9.5 to 10.5 g / L.

3. wet steam dyeing method according to claim 1 or 2, is characterized in that, The temperature of the padding solution is 25-30°C.

4. wet steam dyeing method according to claim 1, is characterized in that, The rolling margin is 60-80%.

5. The wet steam dyeing method according to claim 1 or 4, wherein The rolling is carried out on a rolling mill at a speed of 10 to 45 m / min.

6. wet steam dyeing method according to claim 1, is characterized in that, The steaming and fixing is carried out in a steam box; the temperature of the steaming and fixing is 102-105° C., and the time is 2-3 minutes.

7. The wet steam dyeing method according to claim 1, wherein The cotton and polylactic acid blended fabric is pre-treated before impregnation to obtain the pre-treated cotton and polylactic acid blended fabric; The pretreatment includes low-temperature enzyme desizing treatment, and the temperature of the low-temperature enzyme desizing treatment is 50-55°C.

8. The wet steam dyeing method according to claim 7, wherein The wool effect of the cotton and polylactic acid blended fabric after the pretreatment is greater than or equal to 10 cm / 30 min, and the pH value of the fabric surface is 6.5-7.

5.

9. The wet steam dyeing method according to claim 1, wherein The cotton and polylactic acid blended fabric is woven from warp yarns and weft yarns, wherein the warp yarns are formed from cotton fibers, and the specification of the warp yarns is 40S; the weft yarns are formed from cotton fibers and polylactic acid fibers, and the specification of the weft yarns is 75D / 72F.

10. The wet steam dyeing method according to claim 1 or 9, wherein: The mass content of cotton fiber in the cotton and polylactic acid blended fabric is 65-70%, and the mass content of polylactic acid fiber is 30-35%.

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