A dyeing and finishing method for ultra-fine viscose

Abstract

The invention relates to the technical field of textiles, and provides a dyeing and finishing method for ultrafine denier viscose, comprising the following steps: S1 degreasing: degreasing the ultrafine denier viscose by using a degreasing agent; S2 dyeing: placing the ultrafine denier viscose after the degreasing treatment in a dyeing machine, adding direct dye, sodium sulfate and a leveling agent for dyeing, and dyeing at 98 DEG C for 50 minutes; cooling to 60 DEG C, draining the dye water, and washing at 60 DEG C; S3 soaping: soaping the ultrafine denier viscose after dyeing and washing with water with a soaping agent at 90 DEG C for 20 minutes; cooling to 60 DEG C, draining the soaping waste liquid, and washing at 60 DEG C; S4 color fixing: placing the ultrafine denier viscose after soaping and washing with water in a color fixing liquid, and treating at 50 DEG C for 30 minutes; S5 drying: drying the ultrafine denier viscose after color fixing, and completing the dyeing process of the ultrafine denier viscose. The technical problem that ultra-fine viscose is difficult to dye and finish due to its small fineness has been solved. The method can be used for large-scale factory production, is adaptable to the dyeing of ultra-fine viscose, and improves the performance of the fabric.

Description

Technical Field

[0001] The invention relates to the technical field of textiles, and in particular to a dyeing and finishing method for ultra-fine denier viscose. Background Art

[0002] Viscose fiber has a soft hand feel and good luster. It is as soft as cotton fiber and as smooth as silk fiber. It has good hygroscopicity and air permeability. The basic chemical composition of viscose fiber is the same as that of cotton fiber. Therefore, some of its properties are similar to those of cotton fiber. The difference is that its hygroscopicity and air permeability are better than those of cotton fiber.

[0003] As a novel regenerated cellulose fiber, ultrafine viscose fiber has been widely used in the domestic textile industry. The fiber has fineness, large specific surface area, small bending stiffness, good moisture absorption and air permeability, soft hand feel, soft and delicate luster, smooth surface, light specific gravity, small fiber bending resistance and absolute strength. The fabrics made of it have the advantages of excellent quality and light texture. The fabrics processed by dyeing and finishing are deeply favored by consumers for their soft color, excellent drape, luxurious and elegant texture, silk-like style and elasticity.

[0004] The main features of ultra-fine viscose are as follows:

[0005] 1. The cross section of ultrafine viscose fiber is irregularly zigzag, with many grooves in the longitudinal direction. It has a large specific surface area and high moisture absorption capacity. It can be worn as warm and moisture-absorbing underwear.

[0006] 2. The breaking strength and breaking elongation of ultrafine viscose fiber are small, and the initial modulus is small, which means that the fiber has poor ability to withstand external forces and resist deformation under small deformation conditions. The fabric made of this fiber is soft and comfortable, and is suitable for blending with other fibers to improve its shortcomings such as low strength and poor shaping, and give full play to its own soft characteristics.

[0007] 3. The moisture regain of ultrafine viscose fiber is 11.47%, and the moisture regain after dehumidification is 19.69%. It has good hygroscopicity, mainly because cellulose fiber contains a large number of hydrophilic groups and a large specific surface area. When this fiber is blended with cotton fiber, it can significantly improve the moisture absorption capacity of the fabric and improve the comfort of clothing.

[0008] 4. The curl rate of ultrafine viscose fiber is small, which means that the fiber's cohesion is poor. It can be improved by blending with other fibers in the spinning process. The oil content is high, which can effectively reduce the generation of hairiness and static electricity. The mass specific resistance is small, and the static electricity phenomenon is not obvious, which will not affect the textile processing.

[0009] However, due to the difficulty of dyeing and finishing ultra-fine viscose, no factory has yet carried out large-scale production, and there is little research on the dyeing and finishing process of ultra-fine viscose, and there is no mature dyeing and finishing process. Therefore, in order to overcome the above problems in the prior art, a new ultra-fine viscose dyeing and finishing process is needed to adapt to the dyeing of ultra-fine viscose and improve the performance of the fabric. Summary of the invention

[0010] Based on the above background, the object of the present invention is to provide a dyeing and finishing method for ultra-fine viscose.

[0011] The present invention adopts the following technical solutions:

[0012] A dyeing and finishing method for ultra-fine viscose comprises the following steps:

[0013] S1 Degreasing: Use degreasing agent to degrease the ultra-fine viscose;

[0014] S2 dyeing: Place the degreased ultrafine viscose in a dyeing machine, add direct dye, sodium sulfate and leveling agent for dyeing, dye at 98°C for 50 minutes; cool to 60°C, drain the dye water, and wash at 60°C;

[0015] S3 Soaping: Soap the dyed and washed ultrafine viscose with a soaping agent at 90°C for 20 minutes; cool to 60°C, drain the soaping waste liquid, and wash with water at 60°C;

[0016] S4 Fixation: Place the soaped and washed ultrafine viscose in a fixation solution and treat at 50°C for 30 minutes;

[0017] S5 Drying: Dry the ultra-fine viscose after color fixation to complete the dyeing process of ultra-fine viscose.

[0018] Furthermore, during the degreasing treatment, the concentration of the degreasing agent is 1-2 g / L, the temperature is 40-75° C., and the time is 15-45 minutes.

[0019] Preferably, during the degreasing treatment, the concentration of the degreasing agent is 1.5 g / L, the temperature is 60° C., and the duration is 30 minutes.

[0020] Furthermore, the mass concentration of the added direct dye is 0.5%-5%; the concentration of sodium sulfate is 25g / L-50g / L; and the concentration of the leveling agent is 1.5g / L.

[0021] Furthermore, the direct dye is direct red CN-3B.

[0022] Furthermore, the concentration of the soaping agent is 2 g / L.

[0023] Furthermore, the fixing agent concentration of the fixing solution is 1-3 g / L.

[0024] Furthermore, the fineness of the ultrafine viscose is 0.45 dtex.

[0025] The present invention has the following beneficial effects:

[0026] It solves the technical problem that ultra-fine viscose is difficult to dye and finish due to its small fineness. It can be mass-produced in factories and can adapt to the dyeing of ultra-fine viscose, improve the performance of fabrics. The fabrics after dyeing and finishing have soft color, excellent drape, luxurious and elegant texture, silk-like style, elasticity, and good market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a degreasing process curve diagram of Example 1 of the present invention;

[0028] Figure 2 This is a dyeing process curve diagram of Example 1 of the present invention;

[0029] Figure 3 This is a reactive dye degreasing process curve diagram of Comparative Example 1;

[0030] Figure 4 This is a reactive dyeing process curve diagram of Comparative Example 1;

[0031] Figure 5 This is a process curve diagram of vat dyeing and degreasing in comparative example 2;

[0032] Figure 6 This is the process curve of vat dyeing in comparative example 2. DETAILED DESCRIPTION

[0033] The present invention will be specifically described below in conjunction with embodiments:

[0034] Fabrics, medicines and instruments:

[0035] Fabric: 0.45dtex ultrafine viscose fiber (Japan Kinjuan); 1.33tex ordinary viscose fiber (Jilin Chemical Fiber)

[0036] Chemicals: degreasing agent, reactive dyes, direct dyes, vat dyes, leveling agent, soaping agent, glacial acetic acid, sodium sulfate, soda ash, insurance powder, fixing agent.

[0037] Instruments: color measuring and matching instrument, automatic dripping machine, small setting machine, high temperature small sample machine, small blast drying oven.

[0038] Example 1

[0039] The dyeing and finishing method of ultra-fine viscose comprises the following steps:

[0040] S1 Degreasing: Use degreasing agent to degreasing ultrafine denier viscose, the concentration of degreasing agent is 1.5g / L, the temperature is 60℃, and the time is 30 minutes;

[0041] S2 dyeing: Place the degreased ultrafine viscose in a dyeing machine, add direct red CN-3B, sodium sulfate, and leveling agent (concentration of 1.5 g / L) for dyeing at 98°C for 50 min; cool to 60°C, drain the dye water, and wash at 60°C;

[0042] S3 Soaping: Soap the dyed and washed ultrafine viscose with a soaping agent at 90°C for 20 minutes, with a soaping agent concentration of 2g / L; cool to 60°C, drain the soaping waste liquid, and wash with water at 60°C;

[0043] S4 Fixation: Place the soaped and washed ultrafine viscose in a fixation solution and treat at 50°C for 30 minutes;

[0044] S5 Drying: Dry the ultra-fine viscose after color fixation to complete the dyeing process of ultra-fine viscose.

[0045] The fiber dyeing recipe is shown in Table 1.

[0046] Table 1 Dyeing fiber prescription

[0047] Direct Red CN-3B 0.5％ 1％ 2％ 3％ 5％ Sodium sulfate / (g / L) 25 25 30 40 50 Leveling agent / (g / L) 1.5 1.5 1.5 1.5 1.5 Soap detergent / (g / L) 2 2 2 2 2 Fixing agent / (g / L) 1 1 2 2 3

[0048] The degreasing process curve and dyeing process curve are shown in Figure 1 and Figure 2 shown.

[0049] Comparative Example 1

[0050] Dyeing with reactive dyes:

[0051] Process flow: degreasing → dyeing → peracid → soaping → washing → color fixing → drying;

[0052] Degreasing prescription: Degreasing agent / (g / L) is 1.5;

[0053] Dyeing fiber prescription: see Table 2.

[0054] Table 2 Reactive dyeing process fiber dyeing prescription

[0055] Reactive Red 3BS 0.5％ 1％ 2％ 3％ 5％ Sodium sulfate / (g / L) 25 25 30 40 50 Sodium carbonate / (g / L) 8 8 10 15 15 Leveling agent / (g / L) 1.5 1.5 1.5 1.5 1.5 Soap detergent / (g / L) 2 2 2 2 2 Glacial acetic acid / (g / L) 1 1 1 1 1 Fixing agent / (g / L) 1 1 2 2 3

[0056] The degreasing process curve and dyeing process curve are shown in Figure 3 and Figure 4 shown.

[0057] Comparative Example 2

[0058] Dyeing using vat dyeing process:

[0059] Process flow: degreasing → dyeing → oxidation-reduction → washing → drying;

[0060] Degreasing prescription: Degreasing agent / (g / L) is 1.5;

[0061] Dyeing fiber prescription: see Table 3.

[0062] Table 3 Reduction of fiber dyeing process using vat dyes

[0063] Vat Red 0.5％ 1％ 2％ 3％ 5％ Caustic soda / (g / L) 15 30 50 60 80 Hydrosulfite / (g / L) 8 15 30 40 60 Penetrant / (g / L) 5 5 5 5 5 Hydrogen peroxide / (g / L) 1 1 1 1 1 Soap detergent / (g / L) 2 2 2 2 2

[0064] The degreasing process curve and dyeing process curve are shown in Figure 5 and Figure 6 shown.

[0065] Experimental test:

[0066] 1. Test method:

[0067] 1.1 Coloring rate

[0068] The fiber dyeing depths of 0.45dtex ultra-fine viscose and 1.33tex ordinary viscose were compared, and the color difference between the two was determined using a computer colorimeter.

[0069] 1.2 Washing fastness

[0070] The fabric fastness is tested according to the soap washing fastness GB / T3921-2008 standard.

[0071] 2. Results and Analysis

[0072] 2.1 Comparison of fiber dyeing depth between 0.45dtex ultra-fine viscose and 1.33tex ordinary viscose

[0073] 2.1.1 Analysis of dyeing process results according to Example 1 of the present application

[0074] The colorimetric values ​​of 0.45 dtex ultrafine viscose are shown in Table 4. According to the dyeing process flow of Example 1 of the present application, the same dye concentration of 1.33 tex ordinary viscose under the same dyeing conditions is the standard sample test result.

[0075] The washing fastness grade is determined according to method 1.2.

[0076] Table 4 Color measurement values ​​of 0.45dtex ultra-fine viscose in the dyeing process of Example 1 of the present application

[0077]

[0078]

[0079] From the data in Table 4, it can be seen that the soap fastness of 0.45 dtex ultrafine viscose and 1.33 tex ordinary viscose fibers after dyeing is basically the same.

[0080] 2.2.1 Analysis of reactive dyeing process results

[0081] The colorimetric values ​​of 0.45 dtex ultrafine viscose are shown in Table 5. According to the reactive dye dyeing process of Comparative Example 1, the same dye concentration of 1.33 tex ordinary viscose under the same dyeing conditions is the standard sample test result.

[0082] The washing fastness grade is determined according to method 1.2.

[0083] Table 5 Color measurement values ​​of 0.45dtex ultra-fine viscose dyeing process with reactive dyes

[0084]

[0085] From the data in Table 5, it can be seen that the soap fastness of 0.45 dtex ultrafine viscose and 1.33 tex ordinary viscose fibers after dyeing is basically the same.

[0086] 2.1.3 Analysis of vat dyeing results

[0087] The colorimetric values ​​of 0.45 dtex ultrafine viscose are shown in Table 6. According to the vat dyeing process of Comparative Example 2, the same dye concentration of 1.33 tex ordinary viscose under the same dyeing conditions is the standard sample test result.

[0088] The washing fastness grade is determined according to method 1.2.

[0089] Table 6 Color measurement values ​​of 0.45dtex ultra-fine viscose by vat dyeing process

[0090]

[0091] From the data in Table 6, it can be seen that the soap fastness of 0.45 dtex ultrafine viscose and 1.33 tex ordinary viscose fibers after dyeing is basically the same.

[0092] In summary, from the data in Tables 4, 5 and 6, it can be seen that the soap fastness of 0.45 dtex ultrafine viscose and 1.33 tex ordinary viscose is basically the same. The color difference varies according to the dyeing process.

[0093] According to the dyeing process of Example 1 of the present application, the color difference increases with the increase of the dye concentration, and the average DE value is 2.78. According to the reactive dyeing process of Comparative Example 1, the color difference first decreases and then increases with the increase of the dye concentration, and the average DE value is 3.29. According to the vat dyeing process of Comparative Example 2, the color difference increases with the increase of the dye concentration, and the average DE value is 3.13.

[0094] Therefore, the ultrafine denier viscose has irregular color difference when dyed with reactive dyes according to comparative example 1; has regular color difference when dyed with vat dyes according to comparative example 2 but the average DE value is the largest; and has regular color difference when dyed with dyes according to embodiment 1 of the present application and the average DE value is the smallest!

[0095] Example 2

[0096] The dyeing and finishing method of ultra-fine viscose comprises the following steps:

[0097] S1 Degreasing: Use degreasing agent to degreasing ultrafine denier viscose, the concentration of degreasing agent is 1.5g / L, the temperature is 60℃, and the time is 30 minutes;

[0098] S2 dyeing: the degreased ultrafine viscose was placed in a dyeing machine, and direct red CN-3B (1%), sodium sulfate (25 g / L), and leveling agent (concentration of 1.5 g / L) were added for dyeing at 98°C for 60 min;

[0099] S3 Soaping: Soap the dyed and washed ultrafine viscose with a soaping agent at 90°C for 20 minutes, with a soaping agent concentration of 2g / L;

[0100] S4 washing water: 50℃ warm water 3 times.

[0101] S5 fixation: fixative 1g / L temperature: 50℃, 20 minutes.

[0102] S6 drying: drying at 120℃.

[0103] The ultra-fine denier viscose is blended according to the following ingredients: 60% acrylic fiber 40% ultra-fine denier viscose + 20DPU jersey, hemp red, 160g / ㎡. After identification, the final material surface is intact and flawless. The soap fastness meets customer requirements.

[0104] The dyeing and finishing process of the present application solves the technical problem that ultra-fine denier viscose is difficult to dye and finish due to its small fineness. The process can be used for large-scale factory production, can adapt to the dyeing of ultra-fine denier viscose, and improve the performance of the fabric. The fabric after dyeing and finishing has a soft color, excellent drape, luxurious and elegant texture, silk-like style, elasticity, and good market prospects.

[0105] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A dyeing and finishing method for ultra-fine viscose, characterized in that: The following steps are involved: S1 Degreasing: Use degreasing agent to degrease the ultra-fine viscose; The fineness of the ultra-fine viscose is 0.45 dtex; S2 dyeing: Place the degreased ultrafine viscose in a dyeing machine, add direct dye, sodium sulfate and leveling agent for dyeing, dye at 98°C for 50 minutes; cool to 60°C, drain the dye water, and wash at 60°C; The mass concentration of the added direct dye is 0.5%-5%; the concentration of sodium sulfate is 25g / L-50g / L; the concentration of the leveling agent is 1.5g / L; S3 Soaping: Soap the dyed and washed ultrafine viscose with a soaping agent at 90°C for 20 minutes; cool to 60°C, drain the soaping waste liquid, and wash with water at 60°C; The concentration of the soaping agent is 2 g / L; S4 Fixation: Place the soaped and washed ultrafine viscose in a fixation solution and treat at 50°C for 30 minutes; The fixing agent concentration of the fixing solution is 1-3 g / L; S5 Drying: Dry the ultra-fine viscose after color fixation to complete the dyeing process of ultra-fine viscose.

2. The dyeing and finishing method of ultra-fine viscose according to claim 1, characterized in that: During degreasing treatment, the concentration of the degreasing agent is 1-2 g / L, the temperature is 40-75°C, and the time is 15-45 minutes.

3. The dyeing and finishing method of ultra-fine viscose according to claim 2, characterized in that: During the degreasing treatment, the concentration of the degreasing agent was 1.5 g / L, the temperature was 60°C, and the duration was 30 minutes.

4. The dyeing and finishing method of ultra-fine viscose according to claim 1, characterized in that: The direct dye is direct red CN-3B.

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