Printing and dyeing processing method of silk and lyocell fiber blended fabric

Abstract

The invention relates to a printing and dyeing processing method of a silk and lyocell fiber blended fabric, compared with a traditional printing and dyeing processing technology, an enzyme treatment procedure is added between a bleaching procedure and a dyeing treatment procedure, and the dyeing treatment procedure adopts a double-active-group dye, so that the dyeing efficiency is improved; the binding force between the fibers and dye molecules and between the fibers is effectively improved, and the fibrillating resistance of the fabric is improved, namely the phenomenon that the fibers fall off or form fluff due to external force in the use process is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of textiles, and in particular to a printing and dyeing method for a silk and lyocell fiber blended fabric. Background Art

[0002] Silk fiber is derived from the natural protein secreted by silkworms. It has a delicate structure, soft and smooth touch, and excellent moisture absorption and breathability, making the wearing experience unparalleled. In addition, the soft luster of silk fabrics is both high-end and warm, satisfying consumers' dual pursuit of aesthetics and functionality. However, the high cost of silk fiber limits its widespread popularity in the mass market. In addition, silk fabrics are prone to fibrillation during use, resulting in graying of the surface, affecting the aesthetics and durability, further restricting the market acceptance of silk fabrics.

[0003] As an innovative regenerated cellulose fiber, Lyocell fiber has gradually emerged in the field of textiles, clothing and home textiles with its environmentally friendly production process and excellent physical properties. Lyocell fiber is made by dissolving cellulose raw materials through advanced solvent method and wet spinning. It not only retains the natural comfort and softness of cotton fiber, but also has good air permeability and moisture permeability, charming luster, and delicate hand feel, providing consumers with a wearing experience close to natural fiber. More importantly, the price of Lyocell fiber is relatively affordable, and without special treatment, it has been widely recognized by the market, showing its great potential in alternative or blended materials.

[0004] Given the unique advantages of silk and lyocell fibers, blending the two in order to combine the high-end texture of silk with the economic efficiency and good performance of lyocell has become a feasible way to improve fabric quality and expand market applications. However, the fibrillation problem of both silk and lyocell fibers in the blending process has become a technical challenge that needs to be overcome urgently. Fibrillation not only causes "gray damage" on the surface of the fabric, affecting the appearance and feel, but may also reduce the overall strength and durability of the fabric, thus seriously hindering the promotion of such blended fabrics in the high-end market and daily applications. Summary of the invention

[0005] The purpose of this application is to effectively solve the problems of fibrillation and "ash damage" after washing in blended fabrics.

[0006] To achieve the above objectives, this application is implemented through the following technical solutions: The present application provides a printing and dyeing method for a silk and lyocell fiber blended fabric, comprising the following steps: S1, blending silk and lyocell fiber in a certain ratio to obtain silk lyocell blended fiber, and manufacturing a mixed fabric with the silk lyocell blended fiber as warp and weft yarns; S2, sequentially performing singeing, desizing, bleaching, enzyme treatment, dyeing, softening and shaping, calendering and pre-shrinking steps on the mixed fabric in step S1.

[0007] As a further improvement of the present application, in step S1, the ratio of the silk to the lyocell fiber is 1:4 to 4:1 by mass, the yarn count of the silk lyocell blended fiber is 40s to 100s, and the weave structure of the mixed fabric is twill weave or satin weave.

[0008] As a further improvement of the present application, in step S2, the enzyme treatment solution used in the enzyme treatment contains 5 to 10 g / L of compound enzyme working solution.

[0009] As a further improvement of the present application, the compound enzyme working solution includes the following components, measured by mass: 5 to 10 parts of silk protein hydrolase, 5 to 10 parts of cellulase, 0.5 to 1.5 parts of dispersant, 0.2 to 0.5 parts of preservative, and 88 to 89.3 parts of water.

[0010] As a further improvement of the present application, the compound enzyme working solution is prepared by the following steps: first add water into the reaction container, add silk protein hydrolase and cellulase while stirring, then add dispersant, slowly stir evenly at room temperature, and finally add preservative and stir evenly to obtain the compound enzyme working solution.

[0011] As a further improvement of the present application, in step S2, during the enzyme treatment: the bath ratio of the fabric to the enzyme treatment solution is 1:10-20, the temperature is 50-55°C, and the time is 30-40 min.

[0012] As a further improvement of the present application, soda ash is added to the mixture after the enzyme treatment for inactivation treatment, the concentration of the soda ash is 3-5 g / L, the temperature of the inactivation treatment is 90-95° C., and the time of the inactivation treatment is 40-60 min.

[0013] As a further improvement of the present application, in step S2, the dyeing solution used in the dyeing step includes a dual-active group reactive dye, the pH value of the dyeing solution is 8 to 10, the dyeing temperature is 80 to 90° C., and the dyeing time is 1 to 2 hours.

[0014] As a further improvement of the present application, the dual-active group reactive dye is a bis-vinyl sulfone type reactive dye or a bis-monochloro-s-triazine type reactive dye.

[0015] As a further improvement of the present application, a resin finishing step is further included after the dyeing step and before the soft setting step. Preferably, the finishing agent used in the resin finishing contains modified dimethylol dihydroxy ethylene urea. Further preferably, the concentration of the modified dimethylol dihydroxy ethylene urea is 60 to 80 g / L.

[0016] The beneficial effect of the present application is that the present application provides a printing and dyeing method for a silk and lyocell fiber blended fabric, and solves the technical problem of "gray damage" exhibited by the silk and lyocell fiber blended fabric due to low breaking strength and easy pilling after washing by designing a specific printing and dyeing process, specifically: 1. Compared with traditional printing and dyeing processing technology, this application adds an enzyme treatment process between the bleaching process and the dyeing process, and provides a composite enzyme working solution comprising silk protein hydrolase and cellulase for enzyme treatment. Before the dyeing process, the surface of silk and lyocell fiber blended yarn is exposed to more hydroxyl and amino groups, and the active sites on the fiber surface are increased. Hydroxyl and amino groups are hydrophilic groups, which can adsorb a large amount of water molecules. In the dyeing process, the enhancement of hydrophilicity helps the dye molecules to better wet the fiber surface, thereby promoting the diffusion and penetration of dye molecules, and improving the dyeing speed and dyeing percentage of the dye. In addition, hydroxyl and amino groups can react chemically with the active groups in the dye molecules to form covalent bonds or ionic bonds. The formation of this chemical bond can significantly enhance the bonding force between the dye and the fiber, and improve the fastness and uniformity of dyeing.

[0017] 2. Due to the presence of two reaction sites, the double-active group dye can react with the hydroxyl or amino group on the fiber to form a strong covalent bond, and the dye has a relatively high fixation rate, and the dyed fabric is not easy to fade. In addition, the double-active group dye has good adaptability to pH value and temperature, and can maintain stable dyeing performance under different dyeing conditions.

[0018] 3. In the technical solution of the present application, a resin finishing process is added after the dyeing process and before the soft shaping process. In this process, modified dimethylol dihydroxyethylene urea is evenly applied to the fabric surface. The resin finishing agent contains multiple active groups, such as methylol, etc. These groups can react with hydroxyl groups, amino groups, etc. on the fiber surface by heating to form covalent bonds or ionic bonds. This cross-linking reaction occurs not only between silk fibers, but also between silk fibers and lyocell fibers, and between lyocell fibers, thereby forming a stable network structure, effectively enhancing the bonding force between fibers, and making the fibers more closely interwoven. This enhanced bonding force helps to improve the anti-fibrillation performance of the fabric, that is, to reduce the phenomenon that the fibers fall off or form fluff due to external forces during use. DETAILED DESCRIPTION

[0019] The following will be combined with the embodiments of the present application to clearly and completely describe the technical solution of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with specific implementation methods.

[0021] Example 1 This embodiment provides a printing and dyeing method for a silk and lyocell fiber blended fabric, comprising the following steps: S1. Blending silk and lyocell fiber in a ratio of 1:1 by weight to obtain silk lyocell blended fiber, and using the silk lyocell blended fiber as warp and weft yarns to manufacture a mixed fabric; specifically, the mixed fabric has the following specifications: 105'' / (lyocell / silk 50 / 50) 60S lyocell*(lyocell / silk 50 / 50) 60S lyocell / 200*100 4 / 1 satin, specifically: the above fabric is a 60-spindle fabric with a width of 105 inches, a blend of 50% lyocell and 50% silk, a warp and weft density of 200*100, and a 4 / 1 satin weave.

[0022] S2, singeing, desizing, bleaching, enzyme treatment, dyeing, softening, calendering and pre-shrinking the mixed fabric in step S1 in sequence. Preparation of enzyme treatment solution: First, prepare the compound enzyme working solution. By weight, first add 88.5 parts of water into the reaction container, add 8 parts of silk protein hydrolase and 7 parts of cellulase while stirring, then add 1 part of dispersant, slowly stir evenly at room temperature, and finally add 0.4 parts of preservative and stir evenly to obtain the compound enzyme working solution; secondly, add the compound enzyme working solution into water to prepare an enzyme treatment solution with a concentration of 10 g / L.

[0023] In the enzyme treatment process: in parts by weight, the bath ratio of the fabric to the enzyme treatment solution is 1:15, the temperature is 53°C, and the time is 35 minutes. Soda ash is added to the mixture after the enzyme treatment for inactivation treatment, the concentration of the soda ash is 4g / L, the temperature of the inactivation treatment is 93°C, and the time of the inactivation treatment is 50 minutes.

[0024] In the dyeing process: the fabric is dyed with a dyeing solution containing a divinyl sulfone type active dye, the pH value of the dyeing solution is 9, the dyeing temperature is 85°C, the dyeing time is 2h, and after dyeing, the color is fully fixed, washed, and dried.

[0025] In addition, the steps of singeing, desizing, bleaching, softening, calendering and pre-shrinking in this embodiment are all conventional processing processes in the art.

[0026] Example 2 This embodiment provides a printing and dyeing method for a silk and lyocell fiber blended fabric, comprising the following steps: S1. Blending silk and lyocell fiber in a ratio of 1:4 by weight to obtain silk lyocell blended fiber, and using the silk lyocell blended fiber as warp and weft yarns to manufacture a mixed fabric; specifically, the mixed fabric has the following specifications: 105'' / (lyocell / silk 80 / 20) 60S lyocell*(lyocell / silk 80 / 20) 60S lyocell / 200*100 4 / 1 satin, specifically: the above fabric is a 60-spindle fabric with a width of 105 inches, a blend of 80% lyocell and 20% silk, a warp and weft density of 200*100, and a 4 / 1 satin weave.

[0027] S2, singeing, desizing, bleaching, enzyme treatment, dyeing, softening, calendering and pre-shrinking the mixed fabric in step S1 in sequence. Preparation of enzyme treatment solution: First, prepare the compound enzyme working solution. By weight, first add 88 parts of water into the reaction container, add 5 parts of silk protein hydrolase and 5 parts of cellulase while stirring, then add 0.5 parts of dispersant, slowly stir evenly at room temperature, and finally add 0.2 parts of preservative and stir evenly to obtain the compound enzyme working solution; secondly, add the compound enzyme working solution into water to prepare an enzyme treatment solution with a concentration of 10 g / L.

[0028] In the enzyme treatment process: in parts by weight, the bath ratio of the fabric to the enzyme treatment solution is 1:10, the temperature is 55°C, and the time is 30 minutes. Soda ash is added to the mixture after the enzyme treatment for inactivation treatment, the concentration of the soda ash is 3g / L, the temperature of the inactivation treatment is 90°C, and the time of the inactivation treatment is 60 minutes.

[0029] In the dyeing process: the fabric is dyed with a dyeing solution containing divinyl sulfone type active dyes, the pH value of the dyeing solution is 8, the dyeing temperature is 80°C, the dyeing time is 2h, and after dyeing, the color is fully fixed, washed, and dried.

[0030] In addition, the steps of singeing, desizing, bleaching, softening, calendering and pre-shrinking in this embodiment are all conventional processing processes in the art.

[0031] Example 3 This embodiment provides a printing and dyeing method for a silk and lyocell fiber blended fabric, comprising the following steps: S1. Silk and lyocell fiber are blended in a ratio of 4:1 by weight to obtain silk lyocell blended fiber, and the silk lyocell blended fiber is used as warp and weft yarn to manufacture a mixed fabric; specifically, the specification of the mixed fabric is: 105'' / (lyocell / silk 80 / 20)60S lyocell*(lyocell / silk 80 / 20)60S lyocell / 200*1004 / 1 satin, specifically: the above fabric is a 60-spindle fabric with a width of 105 inches, blended from 20% lyocell and 80% silk, with a warp and weft density of 200*100 and a 4 / 1 satin weave.

[0032] S2, singeing, desizing, bleaching, enzyme treatment, dyeing, softening, calendering and pre-shrinking the mixed fabric in step S1 in sequence. Preparation of enzyme treatment solution: First, prepare the compound enzyme working solution. By weight, first add 89.3 parts of water into the reaction container, add 10 parts of silk protein hydrolase and 10 parts of cellulase while stirring, then add 1.5 parts of dispersant, slowly stir evenly at room temperature, and finally add 0.5 parts of preservative and stir evenly to obtain the compound enzyme working solution; secondly, add the compound enzyme working solution into water to prepare an enzyme treatment solution with a concentration of 5 g / L.

[0033] In the enzyme treatment process: the bath ratio of the fabric to the enzyme treatment solution is 1:20 by weight, the temperature is 50°C, and the time is 40 minutes. Soda ash is added to the mixture after the enzyme treatment for inactivation treatment, the concentration of the soda ash is 5g / L, the temperature of the inactivation treatment is 95°C, and the time of the inactivation treatment is 40 minutes.

[0034] In the dyeing process: the fabric is dyed with a dyeing solution containing a divinyl sulfone type active dye, the pH value of the dyeing solution is 10, the dyeing temperature is 90°C, the dyeing time is 1h, and after dyeing, the color is fully fixed, washed, and dried.

[0035] In addition, the steps of singeing, desizing, bleaching, softening, calendering and pre-shrinking in this embodiment are all conventional processing processes in the art.

[0036] Example 4 The difference between this embodiment and embodiment 1 is that in the dyeing process: a dyeing solution of a bis-monochloro-s-triazine type reactive dye is used to dye the fabric.

[0037] Example 5 A resin finishing process is also included between the dyeing process and the softening and setting process. In the resin finishing process: the fabric is resin finished with a finishing agent containing modified dimethylol dihydroxyethylene urea, the concentration of modified dimethylol dihydroxyethylene urea in the finishing agent is 70g / L, the resin finishing temperature is 140°C, and the resin finishing time is 3 minutes.

[0038] Example 6 A resin finishing process is also included between the dyeing process and the softening and setting process. In the resin finishing process: the fabric is resin finished with a finishing agent containing modified dimethylol dihydroxyethylene urea, the concentration of modified dimethylol dihydroxyethylene urea in the finishing agent is 60g / L, the resin finishing temperature is 130°C, and the resin finishing time is 2 minutes.

[0039] Example 7 A resin finishing process is also included between the dyeing process and the softening and setting process. In the resin finishing process: the fabric is resin-finished with a finishing agent containing modified dimethylol dihydroxyethylene urea, the concentration of the modified dimethylol dihydroxyethylene urea in the finishing agent is 80g / L, the resin finishing temperature is 150°C, and the resin finishing time is 4 minutes.

[0040] Comparative Example 1 The difference between this comparative example and Example 1 is that this comparative example does not include an enzyme treatment step between the bleaching step and the dyeing step.

[0041] Comparative Example 2 The difference between this comparative example and Example 1 is that the fabric is dyed with a dyeing solution containing a single-reactive-group reactive dye.

[0042] Comparative Example 3 The difference between this comparative example and Example 1 is that the step of adding soda ash to the mixture after the enzyme treatment for inactivation treatment is not included.

[0043] According to the standard, the breaking strength of the semi-finished products of Examples 1 to 7 and Comparative Examples 1 to 3, as well as the pilling and breaking strength of the finished products after washing were tested and evaluated, and the results are shown in Table 1, wherein the semi-finished product refers to the cloth after enzyme treatment, and the finished product refers to the cloth after pre-shrinkage.

[0044] Breaking strength: With reference to standard GB / T 7742.1-2005, the breaking strength of the fabric was tested by YG(B)026HC-250 electronic fabric strength tester.

[0045] Anti-pilling: Refer to the standard GB / T 4802.1-2008 and use YG401N fabric flat grinding instrument to test the anti-pilling performance of the fabric.

[0046] Table 1

[0047] According to the requirements of the existing standard GB 18401-2010 "National Textile Basic Safety Technical Code", the tensile breaking strength of the fabric ≥250cN / dtex is the national first-class product.

[0048] By comparing and analyzing Examples 1-4 with Comparative Example 1, it can be seen that although the enzyme treatment process is arranged after the bleaching process and before the dyeing process, the breaking strength of the silk and lyocell fiber blended fabric will be reduced, it can improve the anti-pilling performance of the fabric after washing while ensuring that the breaking strength of the fabric meets the national standard for first-class products.

[0049] Comparative analysis of Examples 1-4 and Comparative Example 2 shows that Comparative Example 2 uses a single-reactive group dye. Compared with the single-reactive group dye, the double-reactive group dye has two reaction sites and can react with the hydroxyl or amino group on the fiber to form a strong covalent bond. Therefore, it can improve the anti-pilling performance of the fabric after washing.

[0050] By comparing and analyzing Examples 1-4 with Comparative Example 3, it can be seen that if the enzyme treatment process is not inactivated, the hydrolysis reaction of silk fibers and cellulose fibers will continue, resulting in a significant decrease in the breaking strength of the formed fabric, and the anti-pilling performance of the fabric after washing is also poor.

[0051] Comparative analysis of Examples 1-4 and Examples 5-7 shows that providing a resin finishing process between the dyeing process and the softening and shaping process is beneficial to further improve the anti-pilling performance of the fabric after washing.

[0052] In summary, the silk and lyocell fiber blended fabric obtained after treatment with the technical scheme of the present application has good breaking strength and anti-pilling performance, especially the anti-pilling index after multiple washings is significantly improved. This shows that the technical scheme of the present application can effectively improve the anti-dust damage and anti-fibrillation properties of the silk and lyocell fiber blended fabric.

[0053] Although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0054] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present application. They are not intended to limit the scope of protection of the present application. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present application should be included in the scope of protection of the present application.

Claims

1. A printing and dyeing method for a silk and lyocell fiber blended fabric, characterized in that: The steps include: S1, blending silk and lyocell fiber in a certain ratio to obtain silk lyocell blended fiber, and manufacturing a mixed fabric with the silk lyocell blended fiber as warp and weft yarns; S2, sequentially performing singeing, desizing, bleaching, enzyme treatment, dyeing, softening and shaping, calendering and pre-shrinking steps on the mixed fabric in step S1.

2. The printing and dyeing method of silk and lyocell fiber blended fabric according to claim 1, characterized in that: In step S1, the ratio of the silk to the lyocell fiber is 1:4 to 4:1 by weight, the yarn count of the silk lyocell blended fiber is 40s to 100s, and the weave structure of the mixed fabric is twill weave or satin weave.

3. The printing and dyeing method of silk and lyocell fiber blended fabric according to claim 1, characterized in that: In step S2, the enzyme treatment solution used in the enzyme treatment contains 5-10 g / L of compound enzyme working solution.

4. The printing and dyeing method of silk and lyocell fiber blended fabric according to claim 3, characterized in that: The compound enzyme working solution comprises the following components in parts by mass: 5 to 10 parts of silk protein hydrolase, 5 to 10 parts of cellulase, 0.5 to 1.5 parts of dispersant, 0.2 to 0.5 parts of preservative, and 88 to 89.3 parts of water.

5. The printing and dyeing method of silk and lyocell fiber blended fabric according to claim 4, characterized in that: The compound enzyme working solution is prepared by the following steps: firstly adding water into a reaction container, adding silk protein hydrolase and cellulase while stirring, then adding a dispersant, slowly stirring evenly at room temperature, and finally adding a preservative and stirring evenly to obtain the compound enzyme working solution.

6. The printing and dyeing method of silk and lyocell fiber blended fabric according to claim 3, characterized in that: In step S2, during the enzyme treatment: the bath ratio of the fabric to the enzyme treatment solution is 1:10-20, the temperature is 50-55°C, and the time is 30-40 minutes.

7. The printing and dyeing method of silk and lyocell fiber blended fabric according to claim 3, characterized in that: Adding soda ash to the mixture after the enzyme treatment for inactivation treatment, the concentration of the soda ash is 3-5 g / L, the temperature of the inactivation treatment is 90-95° C., and the time of the inactivation treatment is 40-60 min.

8. The printing and dyeing method of silk and lyocell fiber blended fabric according to claim 1, characterized in that: In step S2, the dyeing solution used in the dyeing step includes a double-active group reactive dye, the pH value of the dyeing solution is 8-10, the dyeing temperature is 80-90° C., and the dyeing time is 1-2 hours.

9. The printing and dyeing method of silk and lyocell fiber blended fabric according to claim 8, characterized in that: The double-active-group reactive dye is a bis-vinyl sulfone type reactive dye or a bis-monochloro-s-triazine type reactive dye.

10. The printing and dyeing method of silk and lyocell fiber blended fabric according to claim 1, characterized in that: A resin finishing step is also included after the dyeing step and before the soft setting step.

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