Processing method of high-whiteness cotton and wool blended fabric

Abstract

The invention belongs to the technical field of textile fabrics, and particularly relates to a processing method of a high-whiteness cotton and wool blended fabric. The fabric is a cotton and wool blended product, and the wool content is 10-30%; the processing method comprises the following working procedures: (1) raw cotton is treated through the following procedures of blowing, cotton carding, pre-drawing, sliver lap forming, sliver combing and snapping, and cotton fibers are obtained; the method comprises the following steps: performing pretreatment bleaching on cotton fibers in a dyeing machine, and then sequentially washing, spin-drying and drying to obtain bleached cotton fibers; (2) baling the bleached cotton fibers, mixing the baled bleached cotton fibers with mercerized wool fibers, and then carrying out the following treatment processes of cotton carding, primary drawing, secondary drawing, roving, spinning and spooling to obtain bleached cotton wool yarns; (3) bleaching and dyeing the bleached cotton and wool yarns to obtain bleached yarns; and (4) weaving the bleached yarns to obtain a gray fabric, and carrying out after-treatment on the gray fabric to obtain the high-whiteness cotton and wool blended fabric. According to the invention, high whiteness value and low wool damage of the cotton and wool blended product are realized.

Description

Technical Field

[0001] This invention belongs to the field of textile fabric technology, specifically relating to a processing method for high-whiteness cotton-wool blended fabrics. Background Technology

[0002] White shirts, as an essential part of everyday attire, have always been favored by consumers. In recent years, with the global economic recovery and increased consumer purchasing power, the market demand for white shirts has continued to grow. However, considering the warmth requirements of white shirts in autumn and winter, wool, as a warming fiber on the market, has a relatively low whiteness due to its natural yellow or light yellow color, which falls far short of the whiteness requirements for business shirts. There is an urgent need for a wool shirt product that can achieve a high whiteness while maintaining warmth.

[0003] Chinese invention patent application publication number CN118704227A discloses a bleaching process and application for wool fibers, which bleaches wool fiber fabrics through oxidation-reduction bleaching. Chinese invention patent application publication number CN119287650A discloses a one-bath bleaching process for wool fibers, which uses a weakly acidic bleaching activator, a weakly acidic bleaching buffer, and a weakly oxidizing agent instead of traditional strong acids to bleach wool fibers. Chinese invention patent application publication number CN112941891A discloses a method for producing high-whiteness, low-strength wool fabrics, which treats wool fabrics with hydrogen peroxide and ammonium molybdate, and finishes the wool fabrics under weakly acidic conditions using a cold pad-batch method. Chinese invention patent application publication number CN111945270A describes a method for producing bleached cotton-wool blended yarns, introducing two methods for experimentally demonstrating high whiteness effects on cotton and wool from the raw material end. The fiber whitening processes in the above patents only target the whiteness value of wool or cotton fibers and cannot address the overall whitening requirements of blended fabrics. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a processing method for high whiteness cotton-wool blended fabric, which achieves high whiteness value and low wool damage in cotton-wool blended products.

[0005] The processing method of the high whiteness cotton-wool blended fabric of the present invention, wherein the fabric is a cotton-wool blended product with a wool content of 10% to 30%;

[0006] The processing method includes the following steps:

[0007] (1) The raw cotton is processed through the following process: opening → carding → pre-drawing → sliver winding → combing → breaking to obtain cotton fibers; the cotton fibers are pre-treated and bleached in a dyeing machine, and then washed, spun dry and dried in sequence to obtain bleached cotton fibers; after pre-treatment and bleaching, the whiteness value of the bleached cotton fibers is ≥80, and the whiteness value of the bleached cotton wool yarn is ≥60.

[0008] (2) After bleached cotton fibers are packaged, they are mixed with mercerized wool fibers and then processed through the following process: carding → first drawing → second drawing → roving → spinning → winding to obtain bleached cotton wool yarn;

[0009] (3) Bleached cotton wool yarn is obtained after bleaching and dyeing; the whiteness value of the yarn after bleaching and dyeing is between 125 and 140, and the wool fiber damage is less than 2%.

[0010] (4) After bleaching, the yarn is woven to obtain a grey fabric. The grey fabric is then finished to obtain the high-whiteness cotton-wool blended fabric. The finished fabric increases whiteness by 10 to 20 points.

[0011] Preferably, in step (1), the pretreatment bleaching: the cotton fiber is heated to 100℃ at 2.5℃ / min after being dyed in the dyeing machine for 3 minutes;

[0012] Add the bleaching aid to the water. The bleaching aid and the amount added are as follows: 7-10 g / L of 27.5% hydrogen peroxide, 3-4 g / L of caustic soda, 2-3 g / L of refining agent RAYCLEAN SA-E, 0.3-0.7 g / L of chelating agent, and 1-5 g / L of hydrogen peroxide stabilizer RENA. The bleaching environment is 100℃ for 40 minutes.

[0013] Preferably, in step (1), the water washing process involves treatment at 40-60°C for 10-30 minutes, and the water washing aids include neutralizing acid 0.5-2 g / L, deoxygenating enzyme 0.1-0.4 g / L, and softener 2-4 g / L.

[0014] Preferably, in step (3), the bleaching and dyeing process includes enzyme treatment → bleaching and brightening bath → water washing → softening, followed by draining and drying. The bleaching and brightening bath environment is 80℃ for 50 minutes. The auxiliaries are: refining agent RAYCLEAN SA-E1~2g / L, 27.5% hydrogen peroxide: 8~10g / L, and brightening agent. BHA LIQ: 0.6% owf~0.8% owf, whitening agent BV-S BR LIQ: 0.1%owf~0.2%owf.

[0015] Preferably, in the bleaching and dyeing process, the enzyme treatment is as follows: add 1-5 g / L of boiling enzyme and 0.5-3 g / L of refining agent, at 50°C for 30 min.

[0016] Preferably, in the bleaching and dyeing process, the washing step involves adding 0.5–2 g / L of neutralizing acid and 0.1–0.4 g / L of deoxygenating enzyme at 50°C for 10 minutes.

[0017] Preferably, in the bleaching and dyeing process, softening involves adding a softener to water, with the softener accounting for 2% to 4% of the total mass of the softener and water, and then washing at 50°C for 20 minutes.

[0018] Preferably, in step (4), the finishing process includes singeing → roll dyeing and desizing → drying → liquid ammonia → cold pile Osborne bleaching → stretching → pre-shrinking.

[0019] Preferably, in the post-processing stage, singeing is performed at a speed of 90 m / min and a flame intensity of 10.

[0020] Preferably, in the finishing process, the desizing of the dyeing roll is carried out by washing with water in an overflow machine at a temperature of 90-95°C; the auxiliaries include: 3-8 g / L of high-temperature desizing enzyme, 3-8 g / L of refining agent, and 1-5 g / L of penetrant, and the auxiliaries are added to the water.

[0021] Preferably, in the post-processing stage, the drying process is as follows: machine speed 60-80m / min, temperature 100-120℃, and drop width 165.

[0022] Preferably, in the post-treatment process, liquid ammonia is used: vehicle speed 55-75m / min, pH value 5.5~7.5, drop width 143cm, and water washing at room temperature.

[0023] Preferably, in the post-processing, cold reactor Osborne bleaching: the working solution includes a No. 1 mixture, a No. 2 mixture, and a No. 3 mixture. When preparing the mixture, the No. 2 mixture is added to the No. 1 mixture first, and then the No. 3 mixture is added. After mixing, water is added at a bath ratio of 1:20. The cold reactor Osborne bleaching is carried out by two dips and two scourings, and after being piled for 6 to 10 hours, it is washed with water at 60 to 70°C.

[0024] The preparation method of the No. 1 mixture is as follows: After mixing hydrogen peroxide and stable carboxylic acid DSC Osbon U conc.25 for 5 min, the peroxide reaction catalyst DSC Fixer H liq is added, followed by water; wherein, the concentration of 27.5% hydrogen peroxide is 20-30 g / L, DSC Osbon U conc.25 is 1-3 g / L, and DSC Fixer H liq is 3 g / L;

[0025] The preparation method of the No. 2 mixture is as follows: DSC Osbon Catalyst MH 25 bleaching stabilizer and NaOH are mixed under alkaline conditions and then water is added; wherein, DSC Osbon Catalyst MH 25: 10~20g / L, NaOH: 5~10g / L;

[0026] The preparation method of the No. 3 mixture is as follows: mix the anionic surfactant Daidosol SW.512 and the penetrant RAYCLEAN WA-M and then add water; wherein, Daidosol SW.512: 10~20g / L, and penetrant RAYCLEAN WA-M: 1~3g / L.

[0027] Preferably, in the finishing process, the stretching speed is 60-80m / min, the drying oven temperature is 100-120℃, and neutralizing acid RAYTEXIL PH-X is added at 6-10g / L, silicone oil softener RAYSOFT SMI-60 at 8-15g / L, and fatty acid softener RAYSOFTCS-1 at 8-15g / L.

[0028] Preferably, in the finishing process, the pre-shrinking speed is 50-70m / min, and the temperature of both the rubber blanket and the felt blanket is set to 95℃.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] 1. Yarns made from blended fibers of two different properties, conventional raw cotton and wool, have a lower whiteness value. The bleached cotton / mercerized wool product of this invention has a whiteness value 20-30 higher than that of conventional cotton-wool blended yarns, and effectively reduces wool damage during the bleaching and whitening process.

[0031] 2. The blending of bleached cotton and bleached wool requires dyeing equipment for both cotton fibers and loose wool fibers, which is generally not possible for yarn dyeing factories. The bleaching and dyeing requirements of this invention are relatively low, requiring only the blending of bleached cotton fibers with unbleached mercerized wool cotton.

[0032] 3. This invention includes raw material whitening treatment, yarn whitening treatment, and finishing whitening treatment. Using three steps, it improves the overall whiteness of the fabric in multiple dimensions during cotton pretreatment bleaching, dyeing, and finishing, producing a high-whiteness fabric. Based on relatively high-whiteness cotton-wool blended yarns, the whiteness value of the dyed yarn is increased by ≥60 whiteness values, effectively avoiding wool damage during the bleaching process of the raw cotton / wool. The finishing cold-batch Osborne bleaching increases the whiteness value by 10-20 whiteness values. The overall whiteness of the fabric can reach ≥145, and wool damage is ≤2%. Detailed Implementation

[0033] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments.

[0034] Unless otherwise specified, all raw materials used in the examples were commercially available.

[0035] Among them, the refining agent RAYCLEAN SA-E is produced by Zibo Lurui Fine Chemical Co., Ltd.

[0036] whitening agent BHA LIQ, whitening agent Both BV-S BR LIQ are produced by Angco Chemical (China) Co., Ltd.

[0037] The stable carboxylic acid DSC Osbon U conc.25, the alkaline bleaching stabilizer DSC OsbonCatalyst MH 25, the anionic surfactant Daidosol SW.512, and the peroxide reaction catalyst DSC Fixer H liq were all purchased from Keke Chemical (Shanghai) Co., Ltd., manufactured by OSAKA ISHIN CO.,LTD.

[0038] Example 1

[0039] The fabric specifications are C / W40*C / W40*140*90, with a 2 / 2 weave, finished with liquid ammonia, and a cotton / wool blend ratio of 80 / 20.

[0040] The processing method includes the following steps:

[0041] (1) The raw cotton is processed through the following process: opening → carding → pre-drawing → sliver winding → combing → breaking to obtain cotton fibers; the cotton fibers are pre-treated and bleached in a dyeing machine, and then washed, centrifuged and dried in sequence to obtain bleached cotton fibers.

[0042] Pretreatment bleaching: After the cotton fibers have been in the dyeing machine for 3 minutes, the temperature is increased to 100℃ at a rate of 2.5℃ / min;

[0043] Add bleaching aids to water. The bleaching aids and their amounts are as follows: 8 g / L of 27.5% hydrogen peroxide, 3 g / L of caustic soda, 3 g / L of refining agent RAYCLEAN SA-E, 0.5 g / L of chelating agent, and 3 g / L of hydrogen peroxide stabilizer RENA.

[0044] The bleaching environment was 100℃ for 40 minutes.

[0045] Wash twice: 50℃ for 20 min. Washing aids: neutralizing acid 1 g / L, oxygen scavenging enzyme 0.2 g / L, softener 2 g / L.

[0046] (2) After bleached cotton fibers are packaged, they are mixed with mercerized wool fibers and then processed as follows: carding → first drawing → second drawing → roving → spinning → winding to obtain 40S bleached cotton wool yarn with a whiteness value of 69.2.

[0047] (3) 40S bleached cotton and wool yarn is bleached after dyeing; the dyeing process includes enzyme treatment → one bath of bleaching → water washing → softening, and then draining and drying after softening.

[0048] Enzyme treatment: Add 3g / L of boiling enzyme and 1.5g / L of refining agent, 50℃, 30min.

[0049] One bath of bleaching and brightening: 80℃, 50 min; additives: refining agent RAYCLEAN SA-E 1g / L, 27.5% hydrogen peroxide: 8g / L, brightening agent. BHA LIQ: 0.6% owf, whitening agent BV-S BR LIQ: 0.1% owf.

[0050] Wash with water: Add 1.5 g / L of neutralizing acid and 0.2 g / L of deoxygenase, 50 °C, 10 min.

[0051] Softening: Add fabric softener to water, with the softener accounting for 2% of the total mass of the softener and water, and wash at 50°C for 20 minutes.

[0052] After drying, the wool content was measured to be 19.1%, and the whiteness of the cotton-wool yarn was 135.4.

[0053] (4) After the bleached yarn is warped, sized and woven, the greige fabric is obtained with a whiteness value of 132.6.

[0054] Post-finishing includes singeing → desizing → drying → liquid ammonia → cold batch Osborn bleaching → stretching → pre-shrinking, to obtain the finished product:

[0055] Singeing: Vehicle speed 90m / min, flame intensity 10, cutting and burning.

[0056] Desizing of dyed rolls: Wash with water in an overflow machine at a temperature of 90°C; auxiliaries include: 4g / L high-temperature desizing enzyme, 4g / L refining agent, and 2g / L penetrant. Add the auxiliaries to the water.

[0057] Drying: speed 70m / min, temperature 110℃, drop width 165cm.

[0058] Liquid ammonia: vehicle speed 65m / min, pH value 6.5, drop height 143cm, room temperature water wash.

[0059] Osborne bleaching of cold reactor: The working fluid includes Mixture No. 1, Mixture No. 2 and Mixture No. 3. When preparing the mixture, Mixture No. 2 is added to Mixture No. 1 first, and then Mixture No. 3 is added. After mixing, water is added at a bath ratio of 1:20. Osborne bleaching of cold reactor involves two dips and two squeezes. After being stacked for 8 hours, it is washed with water at 65°C.

[0060] The preparation method of the No. 1 mixture is as follows: After mixing hydrogen peroxide and stable carboxylic acid DSC Osbon U conc.25 for 5 min, the peroxide reaction catalyst DSC Fixer H liq is added, followed by water; wherein, the concentration of 27.5% hydrogen peroxide is 25 g / L, DSC Osbon U conc.25 is 2 g / L, and DSC Fixer H liq is 3 g / L;

[0061] The preparation method of the No. 2 mixture is as follows: DSC Osbon Catalyst MH 25, a bleaching stabilizer under alkaline conditions, and NaOH are mixed and then water is added; wherein, DSC Osbon Catalyst MH 25: 15g / L, NaOH: 8g / L;

[0062] The preparation method of the No. 3 mixture is as follows: mix the anionic surfactant Daidosol SW.512 and the penetrant RAYCLEAN WA-M and then add water; wherein, Daidosol SW.512: 15g / L, and penetrant RAYCLEAN WA-M: 2g / L.

[0063] Stretching: machine speed 70m / min, drying oven temperature 110℃, add neutralizing acid RAYTEXIL PH-X: 6g / L, silicone oil softener RAYSOFT SMI-60: 10g / L, fatty acid softener RAYSOFT CS-1: 10g / L.

[0064] Pre-shrinkage: machine speed 60m / min, temperature of both rubber blanket and felt blanket set to 95℃. Finishing of the greige fabric yields the high-whiteness cotton-wool blended fabric.

[0065] The finished product measured a whiteness value of 152.1, which is 19.5 whiteness values ​​higher than that of the greige fabric. The cotton-wool blend ratio is 81.3 / 18.7.

[0066] Example 2

[0067] The fabric specifications are C / W40*C / W40*140*90, with a 2 / 2 weave, finished with liquid ammonia, and a cotton / wool blend ratio of 85 / 15.

[0068] The processing method includes the following steps:

[0069] (1) The raw cotton is processed through the following process: opening → carding → pre-drawing → sliver winding → combing → breaking to obtain cotton fibers; the cotton fibers are pre-treated and bleached in a dyeing machine, and then washed, centrifuged and dried in sequence to obtain bleached cotton fibers.

[0070] Pretreatment bleaching: After the cotton fibers have been in the dyeing machine for 3 minutes, the temperature is increased to 100℃ at a rate of 2.5℃ / min;

[0071] Add bleaching aids to water. The bleaching aids and their amounts are as follows: 8 g / L of 27.5% hydrogen peroxide, 4 g / L of caustic soda, 3 g / L of refining agent RAYCLEAN SA-E, 0.5 g / L of chelating agent, and 3 g / L of hydrogen peroxide stabilizer RENA.

[0072] The bleaching environment was 100℃ for 40 minutes.

[0073] Wash twice: 50℃ for 20 min. Washing aids: neutralizing acid 1.5 g / L, oxygen-removing enzyme 0.2 g / L, softener 3 g / L.

[0074] (2) After bleached cotton fibers are packaged, they are mixed with mercerized wool fibers and then processed through the following process: carding → first drawing → second drawing → roving → spinning → winding to obtain 40S bleached cotton wool yarn with a whiteness value of 86.5.

[0075] (3) 40S bleached cotton and wool yarn is bleached after dyeing; the dyeing process includes enzyme treatment → one bath of bleaching → water washing → softening, and then draining and drying after softening.

[0076] Enzyme treatment: Add 3g / L of boiling enzyme and 1.8g / L of refining agent, 50℃, 30min.

[0077] One bath of bleaching and brightening: 80℃, 50 min; additives: refining agent RAYCLEAN SA-E 1.5 g / L, 27.5% hydrogen peroxide: 9 g / L, brightening agent. BHA LIQ: 0.6% owf, whitening agent BV-S BR LIQ: 0.1% owf.

[0078] Wash with water: Add 1.4 g / L of neutralizing acid and 0.2 g / L of deoxygenase, 50 °C, for 10 min.

[0079] Softening: Add fabric softener to water, with the fabric softener accounting for 3% of the total mass of fabric softener and water, and wash at 50°C for 20 minutes.

[0080] After drying, the wool content was measured to be 14.5%, and the whiteness of the cotton-wool yarn was 138.2.

[0081] (4) After the bleached yarn is warped, sized and woven, the greige fabric is obtained with a whiteness value of 137.87.

[0082] Post-finishing includes singeing → desizing → drying → liquid ammonia → cold batch Osborn bleaching → stretching → pre-shrinking, to obtain the finished product:

[0083] Singeing: Vehicle speed 90m / min, flame intensity 10, cutting and burning.

[0084] Desizing of dyed rolls: Wash with water in an overflow machine at a temperature of 93°C; auxiliaries include: 5g / L high-temperature desizing enzyme, 5g / L refining agent, and 3g / L penetrant. Add the auxiliaries to the water.

[0085] Drying: speed 70m / min, temperature 110℃, drop width 165cm.

[0086] Liquid ammonia: vehicle speed 65m / min, pH value 6.5, drop height 143cm, room temperature water wash.

[0087] Osborne bleaching of cold reactor: The working fluid includes Mixture No. 1, Mixture No. 2 and Mixture No. 3. When preparing the mixture, Mixture No. 2 is added to Mixture No. 1 first, and then Mixture No. 3 is added. After mixing, water is added at a bath ratio of 1:20. Osborne bleaching of cold reactor involves two dips and two squeezings. After being stacked for 8 hours, it is washed with water at 65°C.

[0088] The preparation method of the No. 1 mixture is as follows: After mixing hydrogen peroxide and stable carboxylic acid DSC Osbon U conc.25 for 5 min, the peroxide reaction catalyst DSC Fixer H liq is added, followed by water; wherein, the concentration of 27.5% hydrogen peroxide is 25 g / L, DSC Osbon U conc.25 is 2 g / L, and DSC Fixer H liq is 3 g / L;

[0089] The preparation method of the No. 2 mixture is as follows: DSC Osbon Catalyst MH 25 bleaching stabilizer and NaOH are mixed under alkaline conditions and then water is added; wherein, DSC Osbon Catalyst MH 25: 15g / L, NaOH: 10g / L;

[0090] The preparation method of the No. 3 mixture is as follows: mix the anionic surfactant Daidosol SW.512 and the penetrant RAYCLEAN WA-M and then add water; wherein, Daidosol SW.512: 15g / L, and penetrant RAYCLEAN WA-M: 2g / L.

[0091] Stretching: machine speed 70m / min, drying oven temperature 110℃, add neutralizing acid RAYTEXIL PH-X: 7g / L, silicone oil softener RAYSOFT SMI-60: 12g / L, fatty acid softener RAYSOFT CS-1: 12g / L.

[0092] Pre-shrinkage: machine speed 60m / min, temperature of both rubber blanket and felt blanket set to 95℃. Finishing of the greige fabric yields the high-whiteness cotton-wool blended fabric.

[0093] The finished product measured a whiteness value of 150.2, which is 12.33 whiteness values ​​higher than that of the greige fabric, and the cotton-wool blend ratio is 86.1 / 13.9.

[0094] Example 3

[0095] The fabric specifications are C / W40*C / W40*140*90, with a 2 / 2 weave, finished with liquid ammonia, and a cotton / wool blend ratio of 70 / 30.

[0096] The processing method includes the following steps:

[0097] (1) The raw cotton is processed through the following process: opening → carding → pre-drawing → sliver winding → combing → breaking to obtain cotton fibers; the cotton fibers are pre-treated and bleached in a dyeing machine, and then washed, spun dry and dried in sequence to obtain bleached cotton fibers;

[0098] Pretreatment bleaching: After the cotton fibers have been in the dyeing machine for 3 minutes, the temperature is increased to 100℃ at a rate of 2.5℃ / min;

[0099] Add bleaching aids to water. The bleaching aids and their amounts are as follows: 8 g / L of 27.5% hydrogen peroxide, 4 g / L of caustic soda, 3 g / L of refining agent RAYCLEAN SA-E, 0.5 g / L of chelating agent, and 4 g / L of hydrogen peroxide stabilizer RENA.

[0100] The bleaching environment was 100℃ for 40 minutes.

[0101] Wash twice: 50℃ for 20 min. Washing aids: neutralizing acid 1.5 g / L, oxygen-removing enzyme 0.3 g / L, softener 3 g / L.

[0102] (2) After bleached cotton fibers are packaged, they are mixed with mercerized wool fibers and then processed as follows: carding → first drawing → second drawing → roving → spinning → winding to obtain 40S bleached cotton wool yarn with a whiteness value of 64.4.

[0103] (3) 40S bleached cotton and wool yarn is bleached after dyeing; the dyeing process includes enzyme treatment → one bath of bleaching → water washing → softening, and then draining and drying after softening.

[0104] Enzyme treatment: Add 4 g / L of boiling enzyme and 2.5 g / L of refining agent, 50℃, 30 min.

[0105] One bath of bleaching and brightening: 80℃, 50 min; additives: refining agent RAYCLEAN SA-E 2g / L, 27.5% hydrogen peroxide: 9g / L, brightening agent. BHA LIQ: 0.8% owf, whitening agent BV-S BR LIQ: 0.2% owf.

[0106] Wash with water: Add 1.5 g / L of neutralizing acid and 0.4 g / L of deoxygenase, 50 °C, for 10 min.

[0107] Softening: Add fabric softener to water, with the fabric softener accounting for 3% of the total mass of fabric softener and water, and wash at 50°C for 20 minutes.

[0108] After drying, the wool content was measured to be 28.8%, and the whiteness of the cotton-wool yarn was 130.0.

[0109] (4) After the bleached yarn is warped, sized and woven, the greige fabric is obtained with a whiteness value of 131.64.

[0110] Post-finishing includes singeing → desizing → drying → liquid ammonia → cold batch Osborn bleaching → stretching → pre-shrinking, to obtain the finished product:

[0111] Singeing: Vehicle speed 90m / min, flame intensity 10, cutting and burning.

[0112] Desizing of dyed rolls: Wash with water in an overflow machine at a temperature of 93°C; auxiliaries include: 5g / L high-temperature desizing enzyme, 5g / L refining agent, and 4g / L penetrant. Add the auxiliaries to the water.

[0113] Drying: speed 70m / min, temperature 110℃, drop width 165cm.

[0114] Liquid ammonia: vehicle speed 65m / min, pH value 6.5, drop height 143cm, room temperature water wash.

[0115] Osborne bleaching of cold reactor: The working solution includes Mixture No. 1, Mixture No. 2 and Mixture No. 3. When preparing the mixture, Mixture No. 2 is added to Mixture No. 1 first, and then Mixture No. 3 is added. After mixing, water is added at a bath ratio of 1:20. Osborne bleaching of cold reactor involves two dips and two squeezings. After being stacked for 9 hours, it is washed with water at 65°C.

[0116] The preparation method of the No. 1 mixture is as follows: After mixing hydrogen peroxide and stable carboxylic acid DSC Osbon U conc.25 for 5 min, the peroxide reaction catalyst DSC Fixer H liq is added, followed by water; wherein, the concentration of 27.5% hydrogen peroxide is 28 g / L, DSC Osbon U conc.25 is 3 g / L, and DSC Fixer H liq is 3 g / L;

[0117] The preparation method of the No. 2 mixture is as follows: DSC Osbon Catalyst MH 25 bleaching stabilizer and NaOH are mixed under alkaline conditions and then water is added; wherein, DSC Osbon Catalyst MH 25: 20g / L, NaOH: 10g / L;

[0118] The preparation method of the No. 3 mixture is as follows: the anionic surfactant Daidosol SW.512 and the penetrant RAYCLEAN WA-M are mixed and then water is added; wherein, Daidosol SW.512: 18g / L, and penetrant RAYCLEAN WA-M: 3g / L.

[0119] Stretching: machine speed 70m / min, drying oven temperature 110℃, add neutralizing acid RAYTEXIL PH-X: 7g / L, silicone oil softener RAYSOFT SMI-60: 12g / L, fatty acid softener RAYSOFT CS-1: 12g / L.

[0120] Pre-shrinkage: machine speed 60m / min, temperature of both rubber blanket and felt blanket set to 95℃. Finishing of the greige fabric yields the high-whiteness cotton-wool blended fabric.

[0121] The finished product measured a whiteness value of 146.1, which is 14.46 whiteness values ​​higher than that of the greige fabric. The cotton-wool blend ratio is 71.9 / 28.1.

[0122] Comparative Example 1

[0123] The difference between Comparative Example 1 and Example 1 is that the cotton fibers were not pretreated with a bleaching process in the dyeing machine in step (1). The raw yarn obtained in step (1) has a whiteness value of 50.42. All other processes are the same as in Example 1. The whiteness value of the bleached yarn obtained after the dyeing treatment in step (3) is 110.81, with a cotton-wool blend ratio of 80.8 / 19.2; the whiteness value of the grey fabric is 112.51; and the whiteness value of the finished product is 119.6, with a cotton-wool blend ratio of 83.2 / 16.8.

[0124] Comparative Example 2

[0125] The difference between Comparative Example 2 and Example 1 is that the post-treatment uses oxidative bleaching instead of cold reactor Osborn bleaching.

[0126] Oxidative bleaching: Treat for 150 min, then cool to 30℃ at a rate of 2℃ / min. The working solution is: water with added refining agent RAYCLEAN SA-E, 27.5% hydrogen peroxide, hydrogen peroxide stabilizer RENA, and whitening agent. BHA LIQ, whitening agent BV-S BR LIQ.

[0127] The amounts added are as follows: refining agent RAYCLEAN SA-E: 3 g / L, 27.5% hydrogen peroxide: 15 g / L, hydrogen peroxide stabilizer RENA: 3 g / L, and whitening agent. BHA LIQ: 2g / L, whitening agent BV-S BR LIQ: 2g / L.

[0128] The whiteness value of the bleached yarn obtained after dyeing and bleaching is 134.8, with a cotton-wool blend ratio of 81.0 / 19.0; the whiteness value of the grey fabric is 130.6, the whiteness value of the finished product is 136.21, and the cotton-wool blend ratio is 87.2 / 12.8.

[0129] Comparative Example 3

[0130] The difference between Comparative Example 3 and Example 1 is that the post-treatment uses reduction bleaching instead of cold reactor Osborn bleaching.

[0131] Reduction bleaching: Raise the temperature from 30℃ to 65℃ at a rate of 2℃ / min, hold for 85 minutes, maintain pH at 6, and then cool and rinse the fabric. The working solution consists of: adding sodium hydrosulfite, reducing agent NaHSO3, and brightening agent sequentially to water. BHA LIQ, whitening agent BV-S BR LIQ and neutralizing acid PH-X.

[0132] The amounts added are: sodium hydrosulfite: 1.5 g / L, reducing agent NaHSO3: 8 g / L, and whitening agent. BHA LIQ: 3g / L, whitening agent BV-S BR LIQ: 2.5g / L, neutralizing acid: 0.8g / L.

[0133] The whiteness value of the bleached yarn obtained after dyeing and bleaching is 134.8, with a cotton-wool blend ratio of 81.0 / 19.0; the whiteness value of the grey fabric is 130.6, the whiteness of the finished product is 133.44, and the cotton-wool blend ratio is 86.1 / 13.9.

[0134] Specifically, the whiteness values ​​and cotton-wool blending ratios in different processes in the embodiments and comparative examples are shown in Table 1.

[0135] Table 1. Whiteness values ​​and cotton-wool blend ratios for the examples and comparative examples.

[0136]

[0137] The data in Table 1 shows that this invention mainly achieves an overall whiteness value of ≥145 for high-whiteness blended cotton and wool fabrics by improving the whiteness of raw materials, yarns, and finished fabrics, with wool damage less than 2%. Furthermore, unlike oxidative bleaching and reduction bleaching, which have incompatibility issues with wool damage and whiteness, this invention is effectively compatible.

Claims

1. A processing method for a high-whiteness cotton-wool blended fabric, characterized in that, The fabric is a cotton-wool blend with a wool content of 10% to 30%. The processing method includes the following steps: (1) The raw cotton is processed through the following process: opening → carding → pre-drawing → sliver winding → combing → breaking to obtain cotton fibers; the cotton fibers are pre-treated and bleached in a dyeing machine, and then washed, spun dry and dried in sequence to obtain bleached cotton fibers; (2) After bleached cotton fibers are packaged, they are mixed with mercerized wool fibers and then processed through the following process: carding → first drawing → second drawing → roving → spinning → winding to obtain bleached cotton wool yarn; (3) Bleached cotton and wool yarns are dyed to obtain bleached yarns; (4) After bleaching, the yarn is woven to obtain a grey fabric, and the grey fabric is then finished to obtain the high whiteness cotton-wool blended fabric.

2. The processing method of the high-whiteness cotton-wool blended fabric according to claim 1, characterized in that, In step (1) pretreatment bleaching, the cotton fibers are heated to 100℃ at 2.5℃ / min after 3 minutes in the dyeing machine; Add bleaching aids to water. The bleaching aids and their amounts are as follows: 7-10 g / L of 27.5% hydrogen peroxide, 3-4 g / L of caustic soda, 2-3 g / L of refining agent RAYCLEAN SA-E, 0.3-0.7 g / L of chelating agent, and 1-5 g / L of hydrogen peroxide stabilizer RENA. The bleaching environment was 100℃ for 40 minutes.

3. The processing method of the high-whiteness cotton-wool blended fabric according to claim 1, characterized in that, In step (3), the bleaching and dyeing process includes enzyme treatment → bleaching and brightening bath → water washing → softening. The bleaching and brightening bath environment is 80℃ for 50 minutes. The auxiliaries are: refining agent RAYCLEAN SA-E1~2g / L, 27.5% hydrogen peroxide: 8~10g / L, and brightening agent. BHA LIQ: 0.6% owf~0.8% owf, whitening agent BV-S BR LIQ: 0.1%owf~0.2%owf.

4. The processing method of the high-whiteness cotton-wool blended fabric according to claim 1, characterized in that, In step (4), the finishing process includes singeing → roll dyeing and desizing → drying → liquid ammonia → cold pile Osborne bleaching → stretching → pre-shrinking.

5. The processing method of the high-whiteness cotton-wool blended fabric according to claim 4, characterized in that, In the post-processing stage, during the cold reactor Osborn bleaching, the working solution includes Mixture No. 1, Mixture No. 2, and Mixture No.

3. When preparing the mixture, Mixture No. 2 is added to Mixture No. 1 first, and then Mixture No. 3 is added. After mixing, water is added at a bath ratio of 1:

20. The cold reactor Osborn bleaching process involves two dips and two squeezings, followed by a 6-10 hour standing period and a water wash at 60-70°C. The preparation method of the No. 1 mixture is as follows: After mixing hydrogen peroxide and stable carboxylic acid DSC Osbon U conc.25 for 5 min, the peroxide reaction catalyst DSC Fixer H liq is added, followed by water; wherein, the concentration of 27.5% hydrogen peroxide is 20-30 g / L, DSC Osbon U conc.25 is 1-3 g / L, and DSC Fixer H liq is 3 g / L; The preparation method of the No. 2 mixture is as follows: DSC Osbon Catalyst MH 25 bleaching stabilizer and NaOH are mixed under alkaline conditions and then water is added; wherein, DSC Osbon Catalyst MH 25: 10~20g / L, NaOH: 5~10g / L; The preparation method of the No. 3 mixture is as follows: mix the anionic surfactant Daidosol SW.512 and the penetrant RAYCLEAN WA-M and then add water; wherein, Daidosol SW.512: 10~20g / L, and penetrant RAYCLEAN WA-M: 1~3g / L.

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