Process for improving fibrillation of lyocell or lyocell blended fabric

Abstract

The invention discloses a process for improving fibrillation of lyocell or lyocell blended fabric, and relates to the technical field of lyocell fabric production. According to the technical scheme, lyocell or lyocell blended fabric is used in the warp direction and the weft direction, and the lyocell or lyocell blended fabric which is not fibrillated is obtained through singeing, tight scouring, special bleaching, wet cloth drying, cold dyeing, cold dyeing washing, soaping, tentering and preshrinking; meanwhile, tight scouring, cold dyeing and tentering processes are further improved. According to the invention, the problem of fibrillation of the lyocell or lyocell blended fabric can be solved, so that the lyocell or lyocell blended fabric can resist 50 times of washing, and continuous production of the lyocell or lyocell blended fabric is realized.

Description

Technical Field

[0001] The invention relates to the technical field of lyocell fabric production, in particular to a process for improving the fibrillation of lyocell or lyocell blended fabrics. Background Art

[0002] Lyocell fiber is made from natural plant fiber and is known as the most valuable product in the history of artificial fibers in the past half century. It has many excellent properties of both natural and synthetic fibers. Lyocell is a green fiber. Its raw material is cellulose, which is inexhaustible in nature. There is no chemical reaction in the production process and the solvent used is non-toxic. Clothes made of lyocell fiber not only have a natural luster, smooth feel, high strength, and basically no shrinkage, but also have good moisture permeability and air permeability.

[0003] However, due to the weak lateral bonding force between the fibrils of Lyocell fibers, the bonding force between the fibrils is weakened by external factors such as shear force, friction force, and mechanical force, resulting in peeling and easy formation of fibrillated fibers. Usually, by adding a cross-linking agent in the fiber spinning stage, the active groups of the cross-linking agent react with the fiber hydroxyl groups to form cross-linking bonds, thereby strengthening the lateral bonding force between the fiber macromolecular chains, and making Lyocell fibers less likely to fibrillate under wet friction; or by adding a resin finishing agent during fabric processing for cross-linking. However, if a cross-linking agent is added to the fiber, the cross-linking agent on the fiber will be destroyed by the action of high temperature and high alkali during the dyeing and finishing process, and the fabric will release formaldehyde, the formaldehyde content can reach more than 100ppm, and subsequent improvement is difficult. If the fabric is cross-linked with resin, first, the fabric will feel hard after the resin is added; second, the fabric cost will increase, and the three processes of free ironing-baking-baking and washing need to be added.

[0004] In summary, the development of Lyocell fiber is restricted by the fibrillation problem (i.e., whitening after washing) of Lyocell fabric, and the current methods to solve this problem all have different defects. Therefore, it is necessary to develop a new method that can solve the fibrillation problem of Lyocell while overcoming the defects of the existing solutions. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a process for improving the fibrillation of lyocell or lyocell blended fabrics, which can solve the problem of fibrillation of lyocell or lyocell blended fabrics, make them resistant to 50 washings, and realize the continuous production of lyocell fabrics.

[0006] The technical solution of the present invention is: Improve the fibrillation process of lyocell or lyocell blended fabrics, use lyocell or lyocell blended fabrics in warp and weft directions, singe → tight scouring → special bleaching → wet cloth drying → cold dyeing → cold dyeing washing → soap washing → stretching → pre-shrinking to obtain non-fibrillated lyocell or lyocell blended fabrics; Among them, the tight scouring process is as follows: Desizing: Desizing enzyme OPT-280: 4-6g / L, penetrant ZFC: 3-5g / L, extractant RED: 5-7g / L, refining enzyme CRC: 2-5g / L, steamer temperature: 95-100℃, no cloth piling in the steamer; Scouring: caustic soda: 20-30g / L, refining agent 10-14g / L, penetrant ZFC: 8-10g / L, chelating agent SQ-A: 4-6g / L, degreasing agent TF-109H: 4-6g / L, steamer temperature: 95-100℃, no cloth piling in the steamer; The cold dyeing process is as follows: dye solution 37.8-54.5g / L, penetrant WA-MZ: 2-5g / L, caustic soda: 10-25g / L, substitute alkali WG: 40-60g / L, lyocell locking agent FB: 30-40g / L; The stentering process is as follows: softener DT-8500T: 10-30g / L, penetrant HW: 1-2g / L, neutralizing acid PH-WS: 1-3g / L, fixing agent GD-80: 10-20g / L.

[0007] Preferably, in the tight scouring process, the refining agents used for scouring are scouring agent SA-U: 6-8 g / L and refining enzyme CRC: 4-6 g / L.

[0008] Preferably, in the tight scouring process, the scouring speed is 70-80 m / min.

[0009] Preferably, in the cold dyeing process, the machine speed is 50-70 m / min.

[0010] Preferably, in the cold dyeing process, the stacking time is 12-18 hours.

[0011] Preferably, in the stentering process, the drying room temperature is 120-140°C.

[0012] Preferably, during the tentering process, the vehicle speed is 50-70 m / min.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The pre-treatment of lyocell is different from that of cotton fiber. Cotton fiber needs to be refined and bleached after desizing. However, for lyocell, since there are almost no impurities in the fiber during the production process, it only needs to be desized to remove the oil on the fiber. Therefore, the alkali concentration in the desizing process of ordinary pure cotton and polyester cotton is too high, which will cause the initial fibrillation of lyocell fiber; but if the slurry, oil, etc. in the fiber are not treated thoroughly, it will cause the subsequent fabric dyeing to be shallow or not dyed thoroughly, and the style and feel of the cloth will be poor, affecting the drape of the lyocell fiber fabric. Based on this, the present invention designs a tight scouring process to reduce the concentration of caustic soda, which not only ensures that the impurities in the lyocell fiber are cleanly treated, but also ensures that the lyocell fiber will not be fibrillated, and combines with the degreasing agent TF-109H to remove the oil in the fiber, saving costs and reducing the emission of wastewater and waste gas. At the same time, the essence of the fibrillation phenomenon of lyocell fiber is that the binding force between cellulose macromolecular chains breaks under specific conditions. The present invention adds lyocell binding agent FB in the cold dyeing process, which can achieve deep cross-linking of cellulose molecular chains and enhance the binding force between lyocell fiber macromolecular bonds; and the lyocell binding agent FB itself does not contain formaldehyde and will not decompose formaldehyde. At the same time, in the cold dyeing process, the concentration of caustic soda is 10-25g / L, which ensures that the lyocell binding agent FB reacts under alkaline conditions, thereby playing its role. In addition, in the tentering process of the present invention, the softener DT-8500T is used, which not only greatly improves the feel of lyocell fiber, but also improves the watermark fastness of the fabric and improves the wearing comfort of the fabric. The process of the present invention can solve the problem of fibrillation of lyocell or lyocell blended fabrics, making them resistant to 50 washings, and realizing the continuous production of lyocell or lyocell blended fabrics. DETAILED DESCRIPTION

[0014] In order to enable persons skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention.

[0015] All raw materials used in the following examples and comparative examples, unless otherwise specified, are commercially available products.

[0016] Desizing enzyme OPT-280, Shijiazhuang Lianbang Kete Chemical Co., Ltd.; Penetrant ZFC, Kekai Fine Chemicals (Shanghai) Co., Ltd.; Extraction agent RED, BASF China Co., Ltd.; Refining enzymes CRC, Archroma Chemicals (China) Co., Ltd.; Caustic soda, Sinopec; Refining agent SA-U, Zibo Lurui Fine Chemical Co., Ltd.; Penetrant ZFC, Zibo Lurui Fine Chemical Co., Ltd.; Chelating agent SQ-A, Zibo Lurui Fine Chemical Co., Ltd.; Degreasing agent TF-109H, Transchem Zhilian Co., Ltd.; Penetrant WA-MZ, Zibo Lurui Fine Chemical Co., Ltd.; Alkali substitute WG, Kekai Fine Chemicals (Shanghai) Co., Ltd.; Lyocell lock compound FB, Chuanhua Zhilian Co., Ltd.; Softener DT-8500T, Shijiazhuang Lianbangkete Co., Ltd.; Penetrant HW, Archroma Chemicals (China) Co., Ltd.; Neutralizing acid PH-WS, Zibo Lurui Fine Chemical Co., Ltd.; Fixing agent GD-80, Shijiazhuang Lianbang Kete Co., Ltd.

[0017] Example 1 This embodiment is designed according to the weave specifications, fabric: lyocell 60 / 2×lyocell 60 / 2×135 strands / inch×70 strands / inch, weave: 2 / 1 right bias.

[0018] The process for improving the fibrillation of lyocell fabric in this embodiment is as follows: the lyocell is subjected to singeing → tight scouring → special bleaching → wet cloth drying → cold dyeing → cold dyeing washing → soap washing → stretching → pre-shrinking to obtain a non-fibrillated black lyocell fabric.

[0019] Among them, the tight scouring process is as follows: Desizing: desizing enzyme OPT-280: 4g / L, penetrant ZFC: 3g / L, extractant RED: 5g / L, scouring enzyme CRC: 2g / L, steamer temperature: 100℃, no cloth piling in the steamer; Scouring: caustic soda: 20g / L, refining agent SA-U: 6g / L, refining enzyme CRC: 4g / L, penetrant ZFC: 8g / L, chelating agent SQ-A: 4g / L, degreasing agent TF-109H: 4g / L, steamer temperature: 100℃, no cloth piling in the steamer, vehicle speed: 75m / min.

[0020] The cold dyeing process is as follows: dye solution OC-3R: 1.5g / L, dye solution RS-B: 5g / L, dye solution black SE: 48g / L, penetrant WA-MZ: 3g / L, caustic soda: 15g / L, substitute alkali WG: 50g / L, lyocell locking agent FB: 40g / L, machine speed: 50m / min, and stacking time 18h.

[0021] The stentering process is as follows: softener DT-8500T: 30g / L, penetrant HW: 1g / L, neutralizing acid PH-WS: 1g / L, fixing agent GD-80: 15g / L, drying room temperature: 130℃, vehicle speed: 70m / min.

[0022] After testing, the indicators of the finished lyocell fabric are shown in Table 1: Table 1 Various indicators of the lyocell fabric after finishing in Example 1

[0023] Example 2 This embodiment is designed according to the weave specifications, fabric: Lyocell 120 / 2×Lyocell 40×250 strands / inch×100 strands / inch, weave: 4 / 1 satin.

[0024] The process for improving the fibrillation of lyocell fabric in this embodiment is as follows: the lyocell is subjected to singeing → tight scouring → special bleaching → wet cloth drying → cold dyeing → cold dyeing washing → soap washing → stretching → pre-shrinking to obtain a non-fibrillated navy blue lyocell fabric.

[0025] Among them, the tight scouring process is as follows: Desizing: desizing enzyme OPT-280: 5g / L, penetrant ZFC: 5g / L, extractant RED: 7g / L, scouring enzyme CRC: 5g / L, steamer temperature: 98℃, no cloth piling in the steamer; Scouring: caustic soda: 30g / L, refining agent SA-U: 7g / L, refining enzyme CRC: 5g / L, penetrant ZFC: 10g / L, chelating agent SQ-A: 6g / L, degreasing agent TF-109H: 6g / L, steamer temperature: 98℃, no cloth piling in the steamer, vehicle speed: 70m / min.

[0026] The cold dyeing process is as follows: dye liquor RS-B: 6g / L, dye liquor BL-GB: 22g / L, dye liquor BC-R: 11.5g / L, penetrant WA-MZ: 2g / L, caustic soda: 25g / L, substitute alkali WG: 40g / L, lyocell locking agent FB: 35g / L, vehicle speed: 60m / min, and stacking time 12h.

[0027] The stentering process is as follows: softener DT-8500T: 20g / L, penetrant HW: 2g / L, neutralizing acid PH-WS: 3g / L, fixing agent GD-80: 10g / L, drying room temperature: 120℃, vehicle speed: 60m / min.

[0028] After testing, the various indicators of the finished lyocell fabric are shown in Table 2: Table 2 Various indicators of the lyocell fabric after finishing in Example 2

[0029] Example 3 This embodiment is designed according to the weave specifications, fabric: cotton / lyocell 100 / 2×cotton / lyocell 100 / 2×200 threads / inch×90 threads / inch, weave: 4 / 1 satin.

[0030] The process for improving the fibrillation of lyocell blended fabric in this embodiment is as follows: the lyocell blended fabric is subjected to singeing → tight scouring → special bleaching → wet cloth drying → cold dyeing → cold dyeing washing → soap washing → stretching → preshrinking to obtain a non-fibrillated navy blue lyocell blended fabric.

[0031] Among them, the tight scouring process is as follows: Desizing: desizing enzyme OPT-280: 6g / L, penetrant ZFC: 4g / L, extractant RED: 6g / L, scouring enzyme CRC: 4g / L, steamer temperature: 95℃, no cloth piling in the steamer; Scouring: caustic soda: 25g / L, refining agent SA-U: 8g / L, refining enzyme CRC: 6g / L, penetrant ZFC: 9g / L, chelating agent SQ-A: 5g / L, degreasing agent TF-109H: 5g / L, steamer temperature: 95℃, no cloth piling in the steamer, vehicle speed: 80m / min.

[0032] The cold dyeing process is as follows: dye liquor RS-B: 4.3g / L, dye liquor BL-GB: 22g / L, dye liquor BC-R: 11.5g / L, penetrant WA-MZ: 5g / L, caustic soda: 10g / L, substitute alkali WG: 60g / L, lyocell locking agent FB: 30g / L, vehicle speed: 70m / min, and stacking time 15h.

[0033] The stentering process is as follows: softener DT-8500T: 10g / L, penetrant HW: 1.5g / L, neutralizing acid PH-WS: 2g / L, fixing agent GD-80: 20g / L, drying room temperature: 140℃, vehicle speed: 50m / min.

[0034] After testing, the various indicators of the finished lyocell blended fabric are shown in Table 3: Table 3 Various indicators of the lyocell blended fabric after finishing in Example 3

[0035] Comparative Example 1 The difference from Example 1 is that Comparative Example 1 adopts a desizing process instead of the tight scouring process in Example 1, specifically: desizing: desizing enzyme OPT-280: 4 g / L, penetrant ZFC: 3 g / L, extractant RED: 5 g / L, refining enzyme CRC: 2 g / L, steamer temperature: 100°C, steamer pile cloth treatment time 15 min; scouring: caustic soda: 20 g / L, refining agent SA-U: 6 g / L, refining enzyme CRC: 4 g / L, penetrant ZFC: 8 g / L, chelating agent SQ-A: 4 g / L, degreasing agent TF-109H: 4 g / L, steamer temperature: 100°C, steamer pile cloth treatment time 25 min, vehicle speed: 75 m / min.

[0036] After testing, the various indicators of the finished lyocell fabric are shown in Table 4: Table 4 Various indicators of the lyocell fabric after finishing of Comparative Example 1

[0037] Comparative Example 2 The difference from Example 1 is that in the tight scouring process of Comparative Example 2, during scouring, the caustic soda is 58 g / L.

[0038] After testing, the various indicators of the finished lyocell fabric are shown in Table 5: Table 5 Various indicators of the lyocell fabric after finishing of Comparative Example 2

[0039] Comparative Example 3 The difference from Example 1 is that in the cold dyeing process of Comparative Example 3, no lyocell locking agent FB is added.

[0040] After testing, the various indicators of the finished lyocell fabric are shown in Table 6: Table 6 Various indicators of the lyocell fabric after finishing in Comparative Example 3

[0041] Comparative Example 4 The difference from Example 1 is that in the cold dyeing process of Comparative Example 4, the caustic soda is 8 g / L.

[0042] After testing, the various indicators of the finished lyocell fabric are shown in Table 7: Table 7 Various indicators of the lyocell fabric after finishing of Comparative Example 4

[0043] Lyocell fiber has a cortical structure, and the cortex is very thin and almost translucent. Since the common pre-treatment process (i.e. singeing, scouring and special bleaching) is basically carried out under high temperature, high alkali and high temperature state, the cortex of Lyocell fiber is easily damaged during the processing of Lyocell or Lyocell blended fabrics, causing fiber fibrillation. It can be seen from Comparative Example 1 that after the cortex of Lyocell fiber is damaged during pre-treatment, even if Lyocell condensation agent FB is added in the cold dyeing process, it does not play a role in avoiding fiber fibrillation; at the same time, it can be seen from Comparative Example 3 that even if the pre-treatment process of the present invention is adopted, and Lyocell condensation agent FB is not used in the cold dyeing process, it also does not play a role in avoiding fiber fibrillation. Therefore, the pre-treatment process and cold dyeing process of the present invention need to act simultaneously to improve the whitening of Lyocell or Lyocell blended fabrics after washing. In addition, it can be seen from Comparative Examples 2 and 4 that the problem of fibrillation of Lyocell fibers cannot be avoided even if the caustic soda concentration during scouring in the tight scouring process is too high or the caustic soda concentration during cold dyeing process is too low, which proves that the caustic soda concentration in the tight scouring and cold dyeing processes is also crucial.

Claims

1. A process for improving the fibrillation of lyocell or lyocell blended fabrics, characterized in that: Lyocell or Lyocell blended fabrics are used in warp and weft directions, and are subjected to singeing → tight scouring → special bleaching → wet cloth drying → cold dyeing → cold dyeing washing → soap washing → stentering → pre-shrinking to obtain non-fibrillated Lyocell or Lyocell blended fabrics; Among them, the tight scouring process is as follows: Desizing: Desizing enzyme OPT-280: 4-6g / L, penetrant ZFC: 3-5g / L, extractant RED: 5-7g / L, refining enzyme CRC: 2-5g / L, steamer temperature: 95-100℃, no cloth piling in the steamer; Scouring: caustic soda: 20-30g / L, refining agent 10-14g / L, penetrant ZFC: 8-10g / L, chelating agent SQ-A: 4-6g / L, degreasing agent TF-109H: 4-6g / L, steamer temperature: 95-100℃, no cloth piling in the steamer; The cold dyeing process is as follows: dye solution 37.8-54.5g / L, penetrant WA-MZ: 2-5g / L, caustic soda: 10-25g / L, substitute alkali WG: 40-60g / L, lyocell locking agent FB: 30-40g / L; The stentering process is as follows: softener DT-8500T: 10-30g / L, penetrant HW: 1-2g / L, neutralizing acid PH-WS: 1-3g / L, fixing agent GD-80: 10-20g / L.

2. The process for improving the fibrillation of lyocell or lyocell blended fabrics as claimed in claim 1, characterized in that: In the tight scouring process, the refining agents used for scouring are refining agent SA-U: 6-8g / L and refining enzyme CRC: 4-6g / L.

3. The process for improving the fibrillation of lyocell or lyocell blended fabrics as claimed in claim 1, characterized in that: In the tight scouring process, the scouring speed is 70-80m / min.

4. The process for improving the fibrillation of lyocell or lyocell blended fabrics as claimed in claim 1, characterized in that: In the cold dyeing process, the machine speed is 50-70m / min.

5. The process for improving the fibrillation of lyocell or lyocell blended fabrics as claimed in claim 1, characterized in that: In the cold dyeing process, the piling time is 12-18 hours.

6. The process for improving the fibrillation of lyocell or lyocell blended fabrics according to claim 1, characterized in that: In the stentering process, the drying room temperature is 120-140℃.

7. The process for improving the fibrillation of lyocell or lyocell blended fabrics according to claim 1, characterized in that: During the stenting process, the vehicle speed is 50-70m / min.

Images