Finishing method for improving dimensional stability of jeans wear with high cellulose fiber content

Abstract

The invention discloses a finishing method for improving dimensional stability of jeans wear with high cellulose fiber content, which belongs to the field of textile and comprises the following steps: carrying out first fading treatment on the jeans wear by using enzyme washing liquid containing amylase, cellulase and laccase; and carrying out second color fading treatment on the jeans wear by using a decolorizing solution containing horse radish peroxidase and hydrogen peroxide to inactivate enzyme on the jeans wear, immersing the jeans wear absorbing alkali liquor into a vinyl acetate solution to carry out hydrophobic treatment, washing away residual unreacted substances, and drying the jeans wear. According to the scheme, the size stability of the jean fabric in the washing process can be systematically improved, the number of hydrophilic groups on the surfaces of fibers is reduced, and therefore the water absorption capacity of the fibers is reduced. By means of the treatment, when the fabric enters the wet state subsequently, fibers of the fabric are not prone to swelling deformation, and the size change amplitude is reduced. The defects of long legs and short legs can be greatly reduced, and the garment quality and appearance stability of jean products are improved.

Description

Technical Field

[0001] The present invention relates to a finishing method for improving the dimensional stability of denim clothing with a high cellulose fiber content, belonging to the textile field. Background Art

[0002] Traditional denim clothing needs to go through multiple different washing processes for fading and aging. The washing processes include oxygen bleaching, chlorine bleaching, manganese bleaching, etc., and can also be combined with other treatments, with countless variations, so as to achieve the ever-changing styles of denim clothing. The washing process is an essential link in the production process of denim clothing, and at the same time, it is the key process to increase the added value of denim clothing.

[0003] Cellulose fibers such as cotton fibers and regenerated cellulose fibers have excellent skin-friendly properties and hygroscopicity. The denim clothing made from them is soft and comfortable, with a skin-friendly touch, and is loved by people. However, due to their too-good hygroscopicity, the denim clothing made from them is prone to quality problems of poor dimensional stability after washing. When the content of such cellulose fibers in the fabric is less than 30%, by designing and adjusting the spinning process, weaving process, and post-finishing process, the shrinkage rate of the fabric can be controlled at about -8%. Then, when cutting and sewing, the size of shrinkage is reserved in advance, so that the made denim clothing will not have the quality problem of dislocation after washing.

[0004] However, when the content of such cellulose fibers (cotton fibers, regenerated cellulose fibers) is less than 30%, the comfort of the fabric is insufficient. Based on market demand, when making more soft and comfortable denim clothing, it is necessary to increase the content of cellulose fibers. When the content exceeds 40%, after being processed by front-end spinning, weaving, and post-finishing technologies, it is difficult to control the shrinkage rate of the fabric within a stable range. In addition, after the made denim clothing is processed by the washing process, the washing process will, to a certain extent, damage the fiber structure, for example, reduce the crystallinity of cotton fibers, further enhancing the hygroscopic capacity, resulting in that the denim clothing is more likely to absorb moisture and swell, and the swelling amplitude is also larger. When swelling, the fibers become longer. After the made denim clothing is washed at home or even in a natural humid environment, it will deform, forming the quality problem of "unequal leg lengths". Such quality problems are difficult to repair in the finished clothing state.

[0005] In order to reduce the hygroscopicity of cellulose materials, in other fields using cellulose materials, technicians have carried out hydrophobic treatment on cellulose materials (such as paper). For example, under the catalysis of sulfuric acid, perchloric acid or pyridine, acid anhydrides or acyl chlorides are used as acylating agents to esterify cellulose materials. Since most acid anhydrides or acyl chlorides are sensitive to water, the surface esterification treatment of cellulose materials needs to be carried out in expensive organic solvents, with a long reaction time and a relatively high reaction temperature, which will also affect the morphology and crystal structure of cellulose materials, and cause relatively large damage to the fibers. The treatment process has a high cost and is not conducive to sustainable development. Summary of the Invention

[0006] In order to overcome the deficiencies of the prior art, the present invention provides a finishing method for improving the dimensional stability of denim clothing with a high cellulose fiber content, which can reduce the hygroscopicity of the fabric in denim clothing while ensuring the fading and aging effect.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: A finishing method for improving the dimensional stability of denim clothing with a high cellulose fiber content, comprising the following steps: Perform the first fading treatment on the denim clothing with an enzyme washing solution containing amylase, cellulase, and laccase; Perform the second fading treatment on the denim clothing with a decolorizing solution containing horseradish peroxidase and hydrogen peroxide; Inactivate the enzymes on the denim clothing, and immerse the denim clothing that has absorbed the alkali solution in a vinyl acetate solution for hydrophobic treatment; Wash away the remaining unreacted substances and dry the denim clothing.

[0008] The finishing method for improving the dimensional stability of denim clothing with a high cellulose fiber content provided by this application can systematically improve the dimensional stability of denim fabric during washing, reduce the number of hydrophilic groups on the fiber surface, thereby reducing the water absorption capacity of the fiber. This treatment makes it difficult for the fibers of the fabric to expand and deform when entering the wet state subsequently, reducing the amplitude of dimensional changes. It is beneficial to significantly reduce the "unequal leg length" defect and improve the garment quality and appearance stability of denim products.

[0009] Further, the enzyme washing solution contains 2 g / L to 4 g / L of the amylase, 1 g / L to 2 g / L of the cellulase, and 2 g / L to 3 g / L of the laccase.

[0010] Further, the enzyme washing solution also contains 0.3 g / L to 0.8 g / L of a non-ionic wetting agent, 0.4 g / L to 1 g / L of a dispersant, and 0.4 g / L to 0.6 g / L of a non-ionic anti-wrinkle agent.

[0011] Further, the steps of the first fading treatment include: After putting the denim clothing into a washing machine, first add the non-ionic wetting agent, the dispersant, and the non-ionic anti-wrinkle agent, run for 2 min to 3 min, then add the amylase, the cellulase, and the laccase, adjust the bath ratio to 1:15, and the pH value is between 6.0 and 6.5, heat up to 50°C to 60°C, and continue to run the washing machine for 30 min to 40 min.

[0012] First, add non-ionic wetting agents, dispersants, and non-ionic anti-wrinkle agents and run for a period of time to enable these auxiliaries to fully play their roles, ensure that the solution evenly and well wets the clothing, and create a suitable environment for the subsequent addition of enzymes. Since the suitable conditions for various enzymes are different, adjusting the pH value and temperature to the above-mentioned levels, combined with the concentrations of various enzymes, can enable various enzymes to work in the same environment and ensure the activity of the enzymes. Select an appropriate liquor ratio and time to enable the enzymes to fully treat the denim clothing, achieve efficient desizing and fading, minimize the damage to the fabric, and at the same time, ensure that the COD value of the wastewater formed during the first fading treatment is relatively low when the desired fading effect is achieved, realizing an environmentally friendly and efficient washing process.

[0013] Further, the decolorizing solution contains 100 U / ml to 200 U / ml of the horseradish peroxidase and 3 ml / L to 5 ml / L of hydrogen peroxide.

[0014] The horseradish peroxidase and hydrogen peroxide within this concentration range can effectively play their roles in the second fading treatment, quickly decompose some of the indigo dyes remaining after the first fading treatment, and achieve a further fading effect. At the same time, the appropriate concentration ratio makes it not easy for the bottom surface of the fabric to get stained, ensuring the uniformity and aesthetic degree of the fading effect.

[0015] Further, the temperature of the second fading treatment is 32°C to 40°C, and the treatment time is 30 min to 45 min.

[0016] Further, the step of inactivating the enzymes on the denim clothing includes: Wash the denim clothing that has undergone the second fading treatment with hot water at 85°C to 90°C for 5 min to 10 min, and then dry it with hot air at 100°C to 120°C for 30 min to 40 min.

[0017] Washing with hot water at 85°C to 90°C can inactivate the remaining enzymes on the denim clothing at an appropriate high temperature, avoiding the unnecessary influence of the continued action of the enzymes on the clothing. At the same time, hot water washing can remove the remaining enzymes and other impurities on the clothing surface, ensuring the purity of the subsequent treatment process. Subsequently, drying with hot air at 100°C to 120°C further ensures the complete inactivation of the enzymes and dries the clothing to a certain extent, facilitating the subsequent processes. Appropriate temperature and time control not only ensure the effective inactivation of the enzymes and the removal of impurities but also do not damage the clothing fabric due to excessive temperature or too long time, which is beneficial to maintaining the original performance of the clothing.

[0018] Further, the denim clothing is also treated with ozone for 3 min to 6 min before absorbing the lye, and the ozone concentration is 50 mg / m 3 ~100 mg / m 3 .

[0019] Further, the denim clothing is also subjected to hot air treatment before the ozone treatment: the denim clothing is blown alternately with hot air perpendicular to the fabric and hot air parallel to the fabric, the temperature is 120°C, and the alternation is carried out every 2 minutes for a total of 16 minutes to 20 minutes.

[0020] By adopting specific hot air beating process parameters, the internal stress of the fibers can be eliminated, making the fibers inside the yarns close to each other, while the fibers on the outer layer of the yarns are relatively fluffy. This structural change is beneficial to reducing the shrinkage rate of the fabric and improving the fabric strength. At the same time, the state of the fabric after hot air beating is more conducive to the penetration and action of the treatment liquid in the subsequent ozone treatment and other processes, improving the overall treatment effect, and ultimately improving the dimensional stability and durability of the denim clothing.

[0021] Further, the step of immersing the denim clothing absorbed with the lye into the vinyl acetate solution for hydrophobic treatment includes: Soak the denim clothing in a sodium hydroxide solution with a concentration of 1 mol / L to 2 mol / L for 1 minute to 2 minutes, take out the denim clothing and put it into a vinyl acetate solution with a concentration of 2 mol / L to 5 mol / L for soaking for 2 minutes to 4 minutes.

[0022] The beneficial effects of the present invention are as follows: The finishing method for improving the dimensional stability of the denim clothing with a high cellulose fiber content of the present invention can achieve a good fading and aging effect by using two fading treatments, and has less damage to the fabric, which is beneficial to reducing the decrease in the crystallinity of cotton fibers and reducing the possibility of clothing deformation. Then, the cellulose on the surface of the clothing is esterified in an aqueous solution, reducing the water absorption rate of the denim clothing to a certain extent. Finally, the denim clothing can achieve a conventional aging effect and is not easily deformed during subsequent daily washing. Specific Embodiments

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely below. Obviously, the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts fall within the scope of protection of the present invention.

[0024] It should be understood that, on the premise of no conflict, any and all implementation schemes of the present invention can be combined with the technical features in any other implementation scheme or multiple other implementation schemes to obtain additional implementation schemes. The present invention includes such combined additional implementation schemes.

[0025] Unless otherwise specified, all technical and scientific terms used herein have the standard meanings in the field to which the claimed subject matter pertains. In case of multiple definitions for a term, the definition herein shall prevail.

[0026] In traditional denim clothing washing processes, a large amount of potassium permanganate, hydrogen peroxide, sodium hypochlorite, and sodium hydroxide are used. These washing processes generate a large amount of difficult-to-treat wastewater, which has a high treatment cost and is likely to affect the ecological environment. Additionally, multiple rinses in traditional denim clothing washing processes consume a large amount of time and energy.

[0027] The embodiments of the present application provide a finishing method for improving the dimensional stability of denim clothing with a high cellulose fiber content, including the following steps: S1: Perform the first fading treatment on the denim clothing with an enzyme washing solution containing amylase, cellulase, and laccase.

[0028] S2: Perform the second fading treatment on the denim clothing with a decolorizing solution containing horseradish peroxidase and hydrogen peroxide.

[0029] S3: Inactivate the enzymes on the denim clothing, and immerse the denim clothing that has absorbed the alkali solution into a vinyl acetate solution for hydrophobic treatment.

[0030] S4: Wash away the remaining unreacted substances and dry the denim clothing.

[0031] In step S1, the sizing agent remaining on the yarn is removed by means of amylase, exposing the original surface of the yarn, enabling cellulase and laccase to come into more sufficient contact with the yarn, and the indigo dye attached to the sizing agent falls off with the sizing agent; laccase can decompose part of the dye on the yarn and also the dye that has fallen into the solution; cellulase decomposes cellulose to a certain extent, and the indigo dye hydrogen-bonded to cellulose falls off with the decomposition of cellulose. The first fading treatment can fade a relatively large amount of indigo dye. Compared with the wastewater generated by traditional washing processes, the wastewater formed by the first fading treatment has a lower COD value (chemical oxygen demand).

[0032] Step S2 continues to rapidly decompose part of the indigo on the basis of the first fading treatment having been carried out, and makes the bottom of the fabric less likely to get stained.

[0033] These two fading treatments in step S1 and step S2 can achieve a good fading and aging effect, cause less damage to the fabric, are beneficial to reducing the decrease in the crystallinity of cotton fibers, and reducing the possibility of clothing deformation.

[0034] Step S3 esterifies the cellulose on the clothing surface in an aqueous solution, reduces the water absorption rate of the denim clothing to a certain extent, and ultimately enables the denim clothing to achieve a conventional aging effect and not be easily deformed during subsequent daily washing.

[0035] Specifically, the enzyme washing solution in step S1 contains 2 g / L to 4 g / L of amylase, 1 g / L to 2 g / L of cellulase, and 2 g / L to 3 g / L of laccase.

[0036] The amylase within this concentration range can fully act on denim fabric, effectively removing the sizing agent on the fabric surface, creating conditions for the subsequent better performance of cellulase and laccase. An appropriate amount of cellulase can decompose cellulose to a certain extent while avoiding excessive decomposition of cellulose, which is beneficial for reducing small fibers that are not firmly connected to the main body of the clothing and stabilizing the color fastness after fading and aging. The laccase at a suitable concentration can not only decompose part of the dyes on the yarn but also decompose the dyes that have fallen into the solution, reducing the color staining on the fabric bottom, ensuring the fading effect, helping to reduce the COD value of the wastewater formed during the first fading treatment, and achieving an efficient and environmentally friendly fading process.

[0037] Preferably, the enzyme washing solution also contains 0.3 g / L to 0.8 g / L of non-ionic wetting agent, 0.4 g / L to 1 g / L of dispersant, and 0.4 g / L to 0.6 g / L of non-ionic anti-wrinkle agent.

[0038] The non-ionic wetting agent can reduce the surface tension of the solution, enabling the enzyme washing solution to better infiltrate denim clothing, improving the contact efficiency between the enzyme and the fabric, and enhancing the effect of the enzyme. The dispersant can prevent the enzyme and other substances from aggregating in the solution, making them evenly dispersed, and ensuring that each component can fully play its role. The addition of the non-ionic anti-wrinkle agent helps to reduce the generation of wrinkles during the washing process of denim clothing, maintain the good shape of the clothing, avoid uneven local treatment caused by wrinkles, and at the same time reduce the difficulty and cost of treating the flatness of the clothing in subsequent finishing processes.

[0039] The most suitable working conditions of different enzymes vary. To enable various enzymes to work properly and cooperate with each other in a single bath, the specific process of step S1 in the embodiments of the present application includes: After putting the denim clothing into the washing machine, first add the non-ionic wetting agent, dispersant, and non-ionic anti-wrinkle agent, run for 2 min to 3 min, and then add amylase, cellulase, and laccase, adjust the bath ratio to 1:15, and the pH value is between 6.0 and 6.5, heat up to 50°C to 60°C, and continue to run the washing machine for 30 min to 40 min. Since the action efficiency of different enzymes is affected by enzyme concentration and treatment temperature, and the contribution degree of the action effect to fading is different, it is necessary to reasonably control the treatment process parameters, so as to minimize the damage to the fabric while achieving the fading effect required for traditional denim clothing.

[0040] Step S1 of the embodiment of the present application adopts a mild and environmentally friendly fading and washing method, which can effectively fade the indigo dye on the denim fabric. By adding a high-concentration amylase, it can fully act on the denim fabric to remove the sizing on the fabric surface, enabling cellulase and laccase to better act on denim clothing. Cellulase will decompose cellulose, and laccase can decompose the indigo dye in the denim fabric, thereby enabling the denim clothing to present a faded and white-exposed effect.

[0041] Step S1 of the embodiment of the present application can achieve desizing and fading simultaneously, without traditional chlorine bleaching and manganese bleaching, which can avoid causing damage to the fabric strength, reduce the wastewater COD, and can achieve the conventional fading effect while having basically no impact on the fabric strength and splitting performance.

[0042] In step S2, the decolorizing solution contains 100U / ml - 200U / ml of horseradish peroxidase and 3ml / L - 5ml / L of hydrogen peroxide. Among them, 3ml / L - 5ml / L of hydrogen peroxide is calculated based on pure hydrogen peroxide. Since there is less pure hydrogen peroxide sold in the market, it can also be charged with 5ml / L - 8.5ml / L of 60% hydrogen peroxide, or charged with 10.5ml / L - 18.5ml / L of 27.5% hydrogen peroxide.

[0043] Horseradish peroxidase catalyzes the rapid decomposition of hydrogen peroxide to indigo, and the products are isatin and small molecule substances. The COD value of the wastewater generated in this treatment process is low, which is environmentally friendly and meets the requirements of sustainable development.

[0044] Specifically, the temperature of the second fading treatment is 32°C - 40°C, and the treatment time is 30min - 45min.

[0045] The appropriate temperature range ensures the activity of horseradish peroxidase, enabling it to efficiently catalyze the decomposition of hydrogen peroxide to indigo. Within this temperature range, the catalytic efficiency of the enzyme is high and its stability is good. It can not only quickly achieve the fading effect but also avoid enzyme inactivation or excessive damage to the fiber due to too high temperature. The appropriate treatment time allows the reaction to proceed fully, ensuring sufficient time to decompose the residual indigo dye to reach the ideal fading degree, and at the same time avoiding affecting the fading effect due to too long or too short treatment time, and ensuring a good fading and aging effect without excessive damage to the fabric.

[0046] In step S3, the steps to inactivate the enzyme on the denim clothing include: Wash the denim clothing that has undergone the second fading treatment with hot water at 85°C - 90°C for 5min - 10min, and then dry it with hot air at 100°C - 120°C for 30min - 40min to dry the denim clothing.

[0047] During the traditional desizing and fading processes, multiple cleaning and drying treatments are carried out. For example, after chlorine bleaching, it is cleaned and dried, then manganese bleached, and after manganese bleaching, it is cleaned and dried again. Then, there may be oxygen bleaching, and after oxygen bleaching, it needs to be cleaned and dried again. This consumes a large amount of time and a large amount of energy. In the embodiment of the present application, after the treatment in step S1, the treatment in step S2 can be directly carried out, and after the treatment in step S2, inactivation is carried out uniformly, thereby greatly reducing the waste water volume (reducing cleaning) and energy consumption, and the enzyme treatment can act on the denim fabric faster and more gently.

[0048] The denim clothing is also treated with ozone before absorbing the lye, and the treatment time is 3 min to 6 min. Specifically, an ozone machine in the denim industry is used, and the ozone concentration is 50 mg / m 3 ~100mg / m 3 .

[0049] Utilizing the strong oxidizing property of ozone, within the treatment time of 1 min to 3 min, ozone can act on the surface of the denim clothing fabric to improve the wetting ability of the fibers on the fabric surface. This enables the subsequent denim clothing to better contact the treatment liquid when absorbing the lye and performing the hydrophobic treatment, improving the reaction efficiency and uniformity, and contributing to more effectively modifying the cellulose fibers. Although the ozone treatment itself will slightly damage the fiber structure, combined with the esterification treatment of the water-based treatment liquid, this can instead more significantly reduce the moisture absorption ability of the fibers, reducing the problem of clothing size change caused by fiber moisture absorption after home washing in the future, and being more beneficial to improving the dimensional stability of the clothing.

[0050] The denim clothing is also treated with hot air before ozone treatment: The denim clothing is blown alternately with hot air perpendicular to the fabric and hot air parallel to the fabric, the temperature is 120 °C, and it alternates every 2 min. Each denim clothing is blown for 16 min to 20 min. The hot air beating can make the cotton yarns in the denim clothing compact in the center and fluffy on the periphery, ensuring that the fibers oxidized and damaged during the subsequent ozone treatment are mainly on the surface of the yarns and less inside the yarns, which is beneficial to maintaining the shape of the yarns during ozone treatment and reducing yarn yellowing.

[0051] In step S3, the step of immersing the denim clothing that has absorbed the lye in the vinyl acetate solution for hydrophobic treatment includes: Soaking the denim clothing in a 1 mol / L to 2 mol / L sodium hydroxide solution for 1 min to 2 min, fishing out the denim clothing and putting it into a 2 mol / L to 5 mol / L vinyl acetate solution for soaking for 2 min to 4 min.

[0052] Soak with sodium hydroxide solution to enable the fibers on the surface of denim clothing to absorb the lye, creating conditions for the subsequent reaction between cellulose and vinyl acetate. A sodium hydroxide solution with an appropriate concentration combined with a shorter soaking time can not only ensure that the fibers fully absorb the lye but also prevent excessive corrosion and embrittlement of the fibers. Under these conditions, after the denim clothing is placed in the vinyl acetate solution, vinyl acetate can quickly disperse to the material surface and react with the hydroxyl groups of cellulose, reducing the free hydroxyl groups of the fibers, thereby reducing the hygroscopicity of the fibers. Reasonable control of the concentration and time ensures the effectiveness of the hydrophobic treatment, realizes the efficient modification of cellulose fibers, effectively solves the problem of size change due to moisture absorption of clothing in the natural state caused by a high content of cellulose fibers, and improves the dimensional stability of denim clothing.

[0053] Step S4 can be specifically, for example: Wash the denim clothing with an ethanol solution at 60°C, and then wash it once with normal-temperature clear water. Transfer it to an oven for drying treatment of the denim clothing, and the drying temperature is 70°C - 80°C.

[0054] Experimental comparison Take a kind of denim fabric with a cotton fiber content of 50% and a regenerated cellulose fiber content of 50%. Cut and sew it into jeans of the same specification, record the original leg length, and test the original moisture regain rate of the fabric.

[0055] For the first experimental group, after putting the jeans into the washing machine, add 35L of water, and first add a non-ionic wetting agent (Lutensol XP90 of Shanghai Yushi Cheng Chemical Technology Co., Ltd.), a dispersant (DISPERBYK-190 BYK wetting and dispersing agent of BYK), and a non-ionic anti-wrinkle agent (GL-212 of Guangdong Guanglong Textile New Materials Co., Ltd.) to make the concentration of the non-ionic wetting agent 0.3g / L, the concentration of the dispersant 0.6g / L, and the concentration of the non-ionic anti-wrinkle agent 0.5g / L. Run for 3 minutes, and then add amylase, cellulase, and laccase, adjust the bath ratio to 1:15, make the concentration of amylase 4g / L, the concentration of cellulase 2g / L, and the concentration of laccase 3g / L, and the pH value is in the range of 6.0 - 6.5. Heat up to 60°C and continue to run the washing machine for 30 minutes. After the first fading treatment, the COD value of the wastewater discharged this time is measured to be 283mg / L.

[0056] Without taking out the jeans in the washing machine, continue to add water and feed materials to the washing machine to make the concentration of hydrogen peroxide equivalent to adding 5ml of pure hydrogen peroxide per liter of solution, and the concentration of horseradish peroxidase (Novozymes (China) Biotechnology Co., Ltd.) reaches 100U / ml. Heat up to 35°C and continue to run the washing machine for 30 minutes.

[0057] Wash the denim clothing with 90°C hot water for 5 minutes, and then dry it with 100°C hot air for 40 minutes.

[0058] Soak the jeans in 1 mol / L sodium hydroxide solution for 2 minutes, take out the jeans and soak them in 5 mol / L vinyl acetate solution for 4 minutes.

[0059] Wash the denim clothing with 60 °C ethanol solution, and then wash it once with normal temperature water. Transfer it to an oven for drying, and the drying temperature is 80 °C.

[0060] Test the moisture regain of the denim fabric after drying. Compared with the original moisture regain, the moisture regain of the fabric has decreased by 32.8%.

[0061] Use a household washing machine to continuously wash 10 pairs of jeans treated in the first experimental group 5 times, and then dry them naturally. Measure the leg lengths of the 10 pairs of jeans, and no uneven leg lengths occur.

[0062] In the second experimental group, after putting the jeans into the washing machine, add 35 L of water. First, add a non-ionic wetting agent, a dispersant, and a non-ionic anti-wrinkle agent, so that the concentration of the non-ionic wetting agent is 0.5 g / L, the concentration of the dispersant is 0.4 g / L, and the concentration of the non-ionic anti-wrinkle agent is 0.4 g / L. Run for 2 minutes, and then add amylase, cellulase, and laccase. Adjust the bath ratio to 1:15, so that the concentration of amylase is 3 g / L, the concentration of cellulase is 1.5 g / L, and the concentration of laccase is 2.5 g / L, and the pH value is in the range of 6.0 - 6.5. Heat up to 50 °C and continue to run the washing machine for 40 minutes.

[0063] Without taking out the jeans in the washing machine, continue to add water and feed materials to the washing machine, so that the concentration of hydrogen peroxide is equivalent to adding 4 ml of pure hydrogen peroxide per liter of solution, and the concentration of horseradish peroxidase reaches 120 U / ml. Heat up to 38 °C and continue to run the washing machine for 40 minutes.

[0064] Wash the denim clothing with 85 °C hot water for 10 minutes, and then dry it with 120 °C hot air for 35 minutes.

[0065] Conduct hot air treatment on the jeans at a temperature of 120 °C. Blow the denim clothing alternately with hot air perpendicular to the fabric and hot air parallel to the fabric at a temperature of 120 °C, and alternate every 2 minutes for a total of 20 minutes.

[0066] Use an ozone machine to conduct ozone treatment on the jeans, with an ozone concentration of 50 mg / m 3 , and the treatment time is 3 minutes.

[0067] Soak the jeans in 1 mol / L sodium hydroxide solution for 2 minutes, take out the jeans and soak them in 5 mol / L vinyl acetate solution for 4 minutes.

[0068] Wash the denim clothing with an ethanol solution at 60°C, and then wash it once with normal-temperature clear water. Transfer it to an oven for drying, and the drying temperature is 80°C.

[0069] Use a household washing machine to continuously wash 10 pairs of jeans treated in the first experimental group 5 times, and then let them dry naturally. Measure the leg lengths of the 10 pairs of jeans, and there is no situation of uneven leg lengths.

[0070] Control group Treat traditional denim clothing with conventional washing methods, that is, go through desizing, enzyme wash, clear water wash, chlorine bleach, clear water cleaning, manganese bleach, neutralization treatment, clear water cleaning, and drying in sequence. Combine the wastewater, and the measured COD value of the wastewater is 1459 mg / L.

[0071] Desizing: Add the jeans to a washing machine, add 80 L of water, heat to 40°C, then add 200 ml of soap oil and 500 ml of anti-shrinkage and anti-dyeing powder, and wash with water for 8 min; Enzyme stone wash: Add 18 KG of pumice, 90 L of water, 300 ml of soap oil, 1 L of anti-shrinkage and anti-dyeing powder, and 350 ml of neutral enzyme powder, and wash with normal-temperature water for 30 min; Clear water cleaning: Clean the jeans with clear water 2 times. Add 80 L of clear water to the machine, wash at normal temperature for 3 min, and then dehydrate.

[0072] Drying: Carry out drying treatment on the jeans, with the treatment temperature of 110°C and the treatment time of 10 min.

[0073] Chlorine bleach: Add 100 L of water and heat to 50°C, then add 320 ml of caustic soda, 800 ml of sodium hypochlorite, and 200 ml of soap oil, and wash with water for 15 min; Clear water cleaning: Clean the jeans with clear water 2 times. Add 80 L of clear water to the machine, wash at normal temperature for 3 min, and then dehydrate.

[0074] Dehydration and drying: Treat the denim fabric in a dehydrator for 3 - 5 min, and then treat it in a dryer at 100°C for 20 min.

[0075] Manganese bleach: Add the denim fabric to a washing machine, add 90 L of potassium permanganate solution and 45 KG of industrial salt, and treat at normal temperature for 10 min; Neutralization: Re-add 90 L of water and 230 g of sodium bisulfite, and wash with normal-temperature water for 5 min; Clear water cleaning: Clean the jeans with clear water 2 times. Add 80 L of clear water to the machine, wash at normal temperature for 3 min, and then dehydrate.

[0076] Dehydration and drying: Treat the denim fabric in a dehydrator for 3 - 5 min, and then treat it in a dryer at 100°C for 20 min.

[0077] Wash 10 pairs of jeans treated in the control group continuously 5 times with a household washing machine, and then air-dry them naturally. Measure the leg lengths of the 10 pairs of jeans. The difference between the left and right leg sizes of the pair with the largest deviation is 1.5 inches.

[0078] By comparison, the embodiments of the present application can achieve surface modification of denim clothing, reduce the moisture absorption performance of the fabric, so that the degree of clothing size change caused by moisture absorption of fabrics with a high content of cellulose fiber materials can be reduced, and the quality defect of "one leg longer than the other" can be reduced. It can effectively replace the traditional washing process and solve the quality problems that cannot be solved by the traditional washing process.

[0079] In the description of this specification, the description with reference to terms such as "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0080] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A finishing method for improving the dimensional stability of denim clothing with a high cellulose fiber content, characterized in that, It includes the following steps: Perform the first fading treatment on the denim clothing with an enzyme washing solution containing amylase, cellulase, and laccase; Perform the second fading treatment on the denim clothing with a decolorizing solution containing horseradish peroxidase and hydrogen peroxide; Inactivate the enzymes on the denim clothing, and immerse the denim clothing that has absorbed the alkali solution in a vinyl acetate solution for hydrophobic treatment; Wash away the residual unreacted substances and dry the denim clothing.

2. The finishing method for improving the dimensional stability of denim clothing with a high cellulose fiber content according to claim 1, characterized in that, The enzyme washing solution contains 2 g / L to 4 g / L of the amylase, 1 g / L to 2 g / L of the cellulase, and 2 g / L to 3 g / L of the laccase.

3. The finishing method for improving the dimensional stability of denim clothing with a high cellulose fiber content according to claim 2, characterized in that, The enzyme washing solution also contains 0.3 g / L to 0.8 g / L of a non-ionic wetting agent, 0.4 g / L to 1 g / L of a dispersant, and 0.4 g / L to 0.6 g / L of a non-ionic anti-wrinkle agent.

4. The finishing method for improving the dimensional stability of denim clothing with a high cellulose fiber content according to claim 3, characterized in that, The steps of the first fading treatment include: After putting the denim clothing into the washing machine, first add the non-ionic wetting agent, the dispersant, and the non-ionic anti-wrinkle agent, run for 2 min to 3 min, then add the amylase, the cellulase, and the laccase, adjust the bath ratio to 1:15, and the pH value is between 6.0 and 6.5, heat up to 50°C to 60°C, and continue to run the washing machine for 30 min to 40 min.

5. The finishing method for improving the dimensional stability of denim clothing with a high cellulose fiber content according to claim 1, characterized in that, The decolorizing solution contains 100 U / ml to 200 U / ml of the horseradish peroxidase and 3 ml / L to 5 ml / L of hydrogen peroxide.

6. The finishing method for improving the dimensional stability of denim clothing with a high cellulose fiber content according to claim 5, characterized in that, The temperature of the second fading treatment is 32°C to 40°C, and the treatment time is 30 min to 45 min.

7. The finishing method for improving the dimensional stability of denim clothing with a high cellulose fiber content according to claim 1, characterized in that, The steps of inactivating the enzymes on the denim clothing include: Wash the denim clothing that has undergone the second fading treatment with hot water at 85°C to 90°C for 5 min to 10 min, and then dry it with hot air at 100°C to 120°C for 30 min to 40 min.

8. The finishing method for improving the dimensional stability of denim clothing with a high cellulose fiber content according to claim 1, characterized in that, The denim clothing is also treated with ozone before absorbing the lye, with a treatment time of 3 min to 6 min and an ozone concentration of 50 mg / m 3 ~100 mg / m 3 .

9. The finishing method for improving the dimensional stability of denim clothing with a high cellulose fiber content according to claim 8, characterized in that, Before the ozone treatment, the denim clothing also undergoes hot air treatment: Blow the denim clothing alternately with hot air perpendicular to the fabric and hot air parallel to the fabric, the temperature is 120°C, and it alternates every 2 min for a total of 16 min to 20 min.

10. The finishing method for improving the dimensional stability of denim clothing with a high cellulose fiber content according to claim 1, characterized in that, The steps of immersing the denim clothing that has absorbed the alkali solution in a vinyl acetate solution for hydrophobic treatment include: Soak the denim clothing in a 1 mol / L to 2 mol / L sodium hydroxide solution for 1 min to 2 min, take out the denim clothing and put it into a 2 mol / L to 5 mol / L vinyl acetate solution and soak for 2 min to 4 min.