Enzyme powder as well as preparation method and application thereof

Abstract

The invention discloses enzyme powder as well as a preparation method and application thereof, and belongs to the technical field of textile printing and dyeing. According to the enzyme powder provided by the invention, the components with proper mass parts are selected, and the components have a good synergistic effect, so that a process of combining enzyme washing and bleaching in a jeans wear washing process into one step can be effectively realized, the elasticity of jeans wear is not damaged on the basis of saving the water consumption in the washing process, and the service life of the jeans wear is prolonged. The treated jeans wear has an excellent surface bleaching effect, a back anti-staining effect, ground color luster and texture definition.

Description

Technical Field

[0001] The invention belongs to the technical field of textile printing and dyeing, and in particular relates to enzyme powder and a preparation method and application thereof. Background Art

[0002] Fermentation grinding and bleaching is an important washing method in the washing process of denim clothing. Its purpose is to make the fabric have an old base color and a white and bright appearance on the surface and a soft feel. At present, the two-bath and two-step method of fermentation grinding and bleaching process is: inject clean water with a bath ratio of 1:10 into the washing machine for enzyme powder fermentation grinding, drain, pass clean water once, inject clean water with a bath ratio of 1:10 again, add bleaching products, drain, inject clean water with a bath ratio of 1:10 for neutralization treatment, drain, inject clean water with a bath ratio of 1:15 again for washing, dehydration, and drying to obtain finished garments. The enzyme powder commonly used in the market is medium and high temperature biological enzyme, that is, the use temperature is above 35°C. The products used for bleaching are divided into four products: sodium hypochlorite, hydrogen peroxide, potassium permanganate, and laccase.

[0003] Among them, the four products of sodium hypochlorite, hydrogen peroxide, potassium permanganate and laccase all have their own advantages and disadvantages. First, the sodium hypochlorite bleaching process is to heat the water of the 600-pound washing machine to 35°C and put in sodium hypochlorite; although the price of sodium hypochlorite is low and easy to purchase, there are also problems that cannot be ignored. On the one hand, the amount of sodium hypochlorite used is large, and the reserve product occupies a large space in the factory. A factory with 10 washing machines stores an average of 20 tons of materials, and now the factories are basically in industrial buildings. Loading and unloading materials is time-consuming and laborious, increasing the risk of leakage; on the other hand, most of the finished pants on the market currently contain Lycra ingredients. When using sodium hypochlorite, it is easy to cause blistering and breakage, causing losses to the company; on the third hand, the use of sodium hypochlorite bleaching has a fast reaction speed at high temperature, it is difficult to grasp the effect, there will be toxic gas overflow, and it has a greater impact on the strength of the fabric. Second, the fabric feels good after bleaching using the hydrogen peroxide bleaching process, and no harmful gases are produced; however, its effect on the oxidation of dyes in the finished pants is limited and basically cannot meet the requirements for color discharge. The fabric turns slightly red after treatment, and baking soda (sodium hyposulfite) is required to remove residual hydrogen peroxide in the fabric; at the same time, hydrogen peroxide bleaching has high requirements for equipment, the working liquid temperature is required to reach above 80°C, and the bleaching cost is high. Third, the potassium permanganate bleaching process is to heat the water of a 600-pound washing machine to 50°C. The oxidizing property of potassium permanganate far exceeds that of bleach and hydrogen peroxide, so the dosage is small and the bleaching speed is fast. However, in actual operation, the color removal effect cannot be directly seen after potassium permanganate is put into the washing machine after fermentation. In order to accurately grasp the color removal requirements, the technicians have to take out a pair of pants every 5 minutes and neutralize them with sodium metabisulfite to see the color removal effect. Therefore, the operation is complicated, which not only makes it difficult to grasp the color removal effect, but also wastes materials. At the same time, even after the color removal effect is achieved, 4-6 kilograms of sodium metabisulfite is needed for neutralization, and then clean water is used before drainage, dehydration and drying to obtain the finished garment. In addition, potassium permanganate is a controlled product, and general factories do not have the registration qualification. In addition, during the neutralization process using sodium metabisulfite, a large amount of irritating gas will be released in the workshop, which will harm the workers' health. Fourth, (Novozymes) laccase is a biological enzyme that can directional oxidize indigo dyes. It can meet the bleaching requirements at a water temperature of 50°C. Laccase can be used in the same bath with biological enzymes to meet the required color removal requirements. The fabrics treated with laccase have natural color, soft feel, and are environmentally friendly; however, its price is 90 yuan / kg. Due to its high price, few people use it in the market, and the procurement cycle is very long, which brings inconvenience to large-scale industrial production. That is, the three products widely available in the prior art cannot be used in the same bath with biological enzymes; after multiple experimental comparisons, when various biological enzymes in the market are used in the same bath with the above three products, they basically lose the function of hydrolyzing cellulose after 5-10 minutes.

[0004] The fermentation and bleaching process of denim clothing in a washing plant is to ferment and grind the denim garments with an industrial washing machine, and then rinse them with clean water, inject an appropriate amount of clean water into the industrial washing machine again, heat it to 50-60°C, and add an appropriate amount of bleaching water, hydrogen peroxide, potassium permanganate or laccase to bleach the denim garments according to the depth of the bleached color. However, the existing denim garment bleaching process not only causes a large loss of fabric elasticity, is not suitable for stretch denim, but also is difficult to obtain similar effects in repeated operations. When using potassium permanganate bleaching, the bleaching effect cannot be directly observed. It needs to be neutralized with oxalic acid or sodium metabisulfite to evaluate its bleaching effect. The operation is cumbersome and the accuracy is not high. The existing bleaching products and processes currently used have high water consumption and high control requirements. It takes 130-160 minutes from fermentation to bleaching and cleaning of garments, and consumes 3-4 tons of water. The production efficiency is low, the wastewater discharge is high, and the environmental pollution is serious. In addition, potassium permanganate is a controlled product, and most factories are not qualified to purchase it. With the development of the times, the improvement of people's environmental awareness and the improvement of environmental protection requirements for enterprises, the conventional fermentation, grinding and bleaching process and the products used in it are increasingly unable to meet the development requirements of enterprises and society. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide an enzyme powder and its preparation method and application which can combine enzyme washing and bleaching in the washing process of denim clothing into a one-step process without damaging the elasticity of the denim clothing, and the treated denim clothing has excellent surface bleaching effect, back anti-staining effect, base color gloss and texture clarity.

[0006] To achieve the above object, in a first aspect of the present invention, the present invention provides an enzyme powder, wherein the enzyme powder comprises the following components in parts by weight:

[0007] 5-15 parts of neutral enzyme powder, 20-40 parts of anti-dye powder, 5-15 parts of ammonium sulfate, 0-20 parts of anhydrous sodium sulfate, 25-45 parts of sodium chlorite, 10-25 parts of citric acid;

[0008] The anti-dyeing powder comprises polyester polyether surfactant and perpega.

[0009] The enzyme powder provided by the present invention can effectively combine enzyme washing and bleaching in the washing process of denim clothing into a one-step process by selecting components with appropriate mass parts, and the components have good synergistic effects. On the basis of saving the amount of water used in the washing process, the elasticity of the denim clothing will not be damaged. The treated denim clothing has excellent surface bleaching effect, back anti-staining effect, excellent base color gloss and texture clarity.

[0010] The neutral original enzyme powder provided by the invention is a wide-temperature neutral original enzyme powder, which is a high-concentration powdered neutral cellulase fermented by microorganisms and genetically modified, and can hydrolyze cellulose within the range of pH value of 4.5-9.0 and temperature of 15-65°C.

[0011] The effective content of the anti-dyeing powder provided by the invention is greater than 99.9%, and the powder is a non-ionic surfactant that is easily soluble in water. The pH value of a 10wt% aqueous solution is 6.5-6.8.

[0012] As a preferred embodiment of the enzyme powder of the present invention, the enzyme powder comprises the following components in parts by mass:

[0013] 8-12 parts of neutral enzyme powder, 28-32 parts of anti-dye powder, 8-12 parts of ammonium sulfate, 8-12 parts of anhydrous sodium sulfate, 33-37 parts of sodium chlorite, and 14-18 parts of citric acid.

[0014] The present invention has found that the selection of the mass fraction of the components in the enzyme powder will affect the performance of the denim clothing after being treated by the one-bath fermentation grinding and bleaching process. When the mass fraction of the components in the enzyme powder is further selected to be within the above-mentioned range, the comprehensive performance of the denim clothing after being treated by the one-bath fermentation grinding and bleaching process is better.

[0015] As a preferred embodiment of the enzyme powder of the present invention, the mass ratio of the polyester polyether surfactant and Pingpingjia is 1:1.

[0016] The present invention has found that when the mass ratio of the polyester polyether surfactant and Pingpingjia is further selected to be 1:1, the comprehensive performance of the denim clothing obtained after being treated by the fermentation grinding and bleaching one-bath process is better.

[0017] The polyester polyether surfactant of the present invention is a high molecular weight polyester polyether surfactant.

[0018] In the second aspect of the present invention, the present invention provides a method for preparing enzyme powder, which comprises the following steps: adding citric acid, ammonium sulfate, anti-dyeing powder, neutral enzyme powder and sodium chlorite to anhydrous sodium sulfate in sequence and mixing them evenly to obtain enzyme powder.

[0019] As a preferred embodiment of the preparation method of the present invention, the preparation method comprises the following steps: adding citric acid to anhydrous sodium sulfate, stirring at a speed of 10-25r / min for 3-5min, then adding ammonium sulfate and stirring at a speed of 10-25r / min for 3-5min, then adding anti-dyeing powder and neutral original enzyme powder and stirring at a speed of 10-25r / min for 5-6min, then adding sodium chlorite and stirring at a speed of 5-15r / min until the mixture is uniform; finally, turning off the stirring, cooling to below 25°C, and packaging to obtain enzyme powder.

[0020] The preparation method provided by the present invention is simple to operate, and can effectively obtain enzyme powder with excellent effects by mixing the components in a certain order.

[0021] In the third aspect of the present invention, the present invention provides an application of the enzyme powder in the fermentation and rinsing process of denim clothing.

[0022] The enzyme powder provided by the present invention can be effectively applied to the enzyme grinding and rinsing process of denim clothing, and can meet the one-bath process. The elasticity of the denim clothing will not be damaged after treatment. At the same time, the treated denim clothing has excellent surface bleaching effect, back anti-staining effect, base color gloss and texture clarity.

[0023] In a fourth aspect of the present invention, the present invention provides a fermentation grinding and bleaching one-bath process, the process comprising the following steps:

[0024] (1) adding the denim clothing into water and then adding the enzyme powder of the present invention to perform a first heat preservation treatment;

[0025] (2) After the first heat preservation treatment, the temperature is raised to perform the second heat preservation treatment;

[0026] (3) After the second heat preservation treatment is completed, the working liquid is drained, and then water is added for rinsing. After the rinsing is completed, the rinsed denim clothing is dehydrated and dried to obtain the processed denim clothing.

[0027] The one-bath fermentation bleaching process provided by the invention is simple to operate. After enzyme powder is added, two stages of heat preservation treatment are carried out and then washed once to obtain processed denim clothing, which can significantly shorten the processing time and save processing water.

[0028] As a preferred embodiment of the fermentation grinding and bleaching one-bath process of the present invention, in the step (1), the amount of enzyme powder added is 0.5-1.5% owf.

[0029] The present invention has found that the amount of enzyme powder added will affect the comprehensive effect of the processed denim clothing to a certain extent. When the amount of enzyme powder added is further selected to be 0.5-1.5% owf, excellent comprehensive effects can be achieved on the basis of saving materials.

[0030] As a preferred embodiment of the fermentation grinding and bleaching one-bath process of the present invention, in the step (1), the mass volume ratio of the denim clothing and water is (100-120) kg: (700-850) L.

[0031] The present invention has found that when the mass volume ratio of denim clothing and water is selected within the above range, the enzyme powder can effectively play its role, thereby achieving excellent comprehensive effects.

[0032] As a preferred embodiment of the fermentation grinding and bleaching one-bath process of the present invention, the temperature of the first insulation treatment is 23-27°C, and the time of the first insulation treatment is 30-40 minutes; the temperature of the second insulation treatment is 30-40°C, and the time of the second insulation treatment is 30-40 minutes.

[0033] The fermentation grinding and bleaching one-bath process provided by the present invention has a mild treatment temperature, and can avoid energy waste caused by excessive heating or damage to the denim clothing itself caused by excessive heating.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The enzyme powder provided by the present invention can effectively combine the enzyme washing and bleaching in the washing process of denim clothing into a one-step process by selecting components of appropriate mass parts, and the components have good synergy, so as to save the amount of water used in the washing process without damaging the elasticity of the denim clothing, and the treated denim clothing has excellent surface bleaching effect, anti-staining effect on the back, and excellent base color gloss and texture clarity. In addition, the preparation method of the enzyme powder provided by the present invention is simple to operate and is conducive to actual production.

[0036] Specifically, on the first aspect, by using the one-bath fermentation bleaching process using the enzyme powder of the present invention, 1-1.5 tons of water can be saved for each washing of denim fabrics, and the amount of sewage discharged is greatly reduced, thereby achieving the effects of water saving and emission reduction, and also reducing production costs; on the second aspect, the one-bath process provided by the present invention does not need to be heated to an excessively high temperature, and bleaching can be performed within the normal temperature range, which can significantly save steam energy, save costs, and reduce carbon dioxide emissions; on the third aspect, in the one-bath process provided by the present invention, the bleaching effect increases in direct proportion to time, the bleaching effect is easy to control, the effect can be directly seen without neutralization, the operation is simple, the cost is reduced, and the production efficiency is improved; on the fourth aspect, the components in the enzyme powder provided by the present invention cooperate with each other, and the effect on denim is mild. For example, the use of sodium chlorite has extremely low effects on the elasticity and strength of denim fabrics, and the fabric will not break or wear out, thereby reducing the risk of compensation for the enterprise. DETAILED DESCRIPTION

[0037] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0038] Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art.

[0039] The parallel examples and comparative examples were identical except for the differences noted.

[0040] Neutral original enzyme powder: Depeng New Materials, original enzyme 265;

[0041] Polyester polyether surfactant: Yimeier, polyester anti-dyeing particles SP-105A;

[0042] Ping Pingjia: Shanghai Dongda Chemistry, O-80.

[0043] Examples 1-4 and Comparative Examples 1-6

[0044] The embodiments of the present invention and the comparative examples provide an enzyme powder, the components (by mass) of the enzyme powder are shown in Table 1;

[0045] Table 1

[0046]

[0047] The preparation method of the enzyme powder in the embodiment 1 is:

[0048] (1) Add anhydrous sodium sulfate to a clean horizontal mixer and start stirring;

[0049] (2) Add citric acid and stir at 20 r / min for 4 min until completely mixed;

[0050] (3) Add ammonium sulfate and stir at 20 r / min for 4 min until completely mixed;

[0051] (4) Add anti-dye powder and neutral enzyme powder, and stir at 20 r / min for 4 min until completely mixed;

[0052] (5) adding sodium chlorite and stirring at a speed of 10 r / min until completely mixed;

[0053] (6) Turn off the stirring, check and confirm that there is no lumps in the powder in the mixer, let it stand and cool until the temperature of the material in the mixer is lower than 25°C, then discharge the material and package it to obtain the enzyme powder.

[0054] The preparation methods of the enzyme powders in Examples 2-4 and Comparative Examples 1-6 are consistent with the preparation method of enzyme powder 1, and no related components are added.

[0055] Test Example 1

[0056] The present invention provides a fermentation grinding bleaching one-bath process, which comprises the following steps:

[0057] (1) Add 800 L of water and 100 kg of denim clothing into an industrial washing machine, then add 1% owf of the enzyme powder prepared in Example 1, and treat at room temperature (25° C.) for 35 min;

[0058] (2) Heating to 40°C for 35 min;

[0059] (3) After the treatment, drain the working fluid in the industrial washing machine and then add 1500L of water to wash for 3 minutes;

[0060] (4) After washing, drain the water in the industrial washing machine, then dehydrate for 5 minutes and dry (90°C steam dryer) to obtain the processed denim clothing.

[0061] Test Example 2

[0062] The test example of the present invention provides a one-bath fermentation bleaching process, and the only difference between the process and the test example 1 is that the enzyme powder used is the enzyme powder prepared in Example 2.

[0063] Test Example 3

[0064] The test example of the present invention provides a one-bath fermentation bleaching process, and the only difference between the process and the test example 1 is that the enzyme powder used is the enzyme powder prepared in Example 3.

[0065] Test Example 4

[0066] The test example of the present invention provides a one-bath fermentation grinding and bleaching process. The only difference between the process and the test example 1 is that the enzyme powder used is the enzyme powder prepared in Example 4.

[0067] Comparative test example 1

[0068] The comparative test example of the present invention provides a one-bath fermentation grinding and bleaching process, and the only difference between the process and Test Example 1 is that the enzyme powder used is the enzyme powder prepared in Comparative Example 1.

[0069] Comparative Test Example 2

[0070] The comparative test example of the present invention provides a one-bath fermentation grinding and bleaching process, and the only difference between the process and Test Example 1 is that the enzyme powder used is the enzyme powder prepared in Comparative Example 2.

[0071] Comparative Test Example 3

[0072] The comparative test example of the present invention provides a one-bath fermentation grinding and bleaching process, and the only difference between the process and Test Example 1 is that the enzyme powder used is the enzyme powder prepared in Comparative Example 3.

[0073] Comparative Test Example 4

[0074] The comparative test example of the present invention provides a one-bath fermentation grinding and bleaching process, and the only difference between the process and Test Example 1 is that the enzyme powder used is the enzyme powder prepared in Comparative Example 4.

[0075] Comparative Test Example 5

[0076] The comparative test example of the present invention provides a one-bath fermentation grinding and bleaching process, and the only difference between the process and Test Example 1 is that the enzyme powder used is the enzyme powder prepared in Comparative Example 5.

[0077] Comparative Test Example 6

[0078] The comparative test example of the present invention provides a one-bath fermentation grinding and bleaching process, and the only difference between the process and Test Example 1 is that the enzyme powder used is the enzyme powder prepared in Comparative Example 6.

[0079] Comparative Test Example 7

[0080] The comparative test example of the present invention provides a denim fermentation grinding and bleaching process, which comprises the following steps:

[0081] (1) Enzyme washing: Add 1000L of water and 100kg of denim clothing into an industrial washing machine, heat it to 40°C, add 1g / L of traditional denim water-washing enzyme powder DP-24, run the enzyme washing for 35min, then drain the working fluid and wash with 1500L of clean water for 3min;

[0082] (2) Bleaching: add 1000L of water, raise the temperature to 40°C, add 10g / L of bleaching water, add an appropriate amount of caustic soda, adjust the pH value of the working solution to 9, run the bleaching process for 40 minutes, and then drain the working solution;

[0083] (3) Neutralization: Add 1000L of water, add appropriate amount of hydrogen peroxide and washing powder, run neutralization for 10 minutes, and then drain the working liquid;

[0084] (4) Cleaning: Add 1500L of water, clean the denim for 3 minutes, and then drain the cleaning solution;

[0085] (5) Dehydration and drying: Dehydrate the washed denim clothing for 5 minutes, and then dry it in a 90°C steam dryer; after the dried denim clothing cools to room temperature, the processed denim clothing is obtained.

[0086] Comparative Test Example 8

[0087] The comparative test example of the present invention provides a fermentation grinding bleaching one-bath process, which comprises the following steps:

[0088] (1) Add 800 L of water and 100 kg of denim clothing into an industrial washing machine, then add 1% owf enzyme powder prepared without adding ammonium sulfate and sodium chlorite (the only difference between the enzyme powder and the enzyme powder prepared in Example 1 is that no ammonium sulfate and sodium chlorite are added), and treat at room temperature (25°C) for 35 minutes;

[0089] (2) Drain the working fluid in the industrial washing machine; add 800L of water, heat to 40°C, add ammonium sulfate and sodium chlorite (the number of ammonium sulfate and sodium chlorite here is consistent with the number of enzyme powder in Example 1) and treat for 60 minutes;

[0090] (3) After the treatment, drain the working fluid in the industrial washing machine and then add 1500L of water to wash for 3 minutes;

[0091] (4) After washing, drain the water in the industrial washing machine, then dehydrate for 5 minutes and dry (90°C steam dryer) to obtain the processed denim clothing.

[0092] Effect Example 1

[0093] The effect examples of the present invention explore the performance of the denim clothing processed by test examples 1-4 and comparative test examples 1-8, including the following aspects:

[0094] 1. Denim surface bleaching effect and denim back anti-staining effect: visually inspect and record under D6 standard light source conditions. The more “+” there are, the stronger the denim surface bleaching is and the lighter the back staining is, that is, the better the back anti-staining effect is;

[0095] 2. Base color gloss: It is graded by visual inspection and is divided into five levels: excellent, good, fair, poor, and bad. Excellent represents bright color, and poor represents dullness.

[0096] 3. Texture clarity: Grading is done by visual inspection and is divided into five levels: excellent, good, fair, poor, and bad. Excellent means clear texture and clean base, while poor means chaotic texture and hazy base.

[0097] 4. Denim strength test: Use the falling hammer fabric tearing tester (YGB033A) for testing; the reference standard is GB / T3917.1;

[0098] The test results are shown in Table 2;

[0099] Table 2

[0100]

[0101]

[0102] It can be seen from Table 2 that when the technical solution of the present invention is adopted, the surface bleaching effect and the back anti-staining effect of the processed denim clothing are excellent, and the number of "+" obtained is more than 4; the base color gloss and texture clarity are both above average, and in the strength test, the strength of the warp yarn is more than 24.1N, and the strength of the weft yarn is more than 21.1N; compared with the conventional method in Comparative Test Example 7 or the step-by-step addition of components in Comparative Test Example 8, the comprehensive performance of the processed denim clothing is significantly improved;

[0103] It can be seen from Test Example 1, Test Example 4 and Comparative Test Examples 1-2 that the mass ratio of the anti-dyeing powder polyester polyether surfactant and Pingpingjia in the enzyme powder will affect the effect, and whether the two are added at the same time will also have an effect. When only Pingpingjia is added in Comparative Test Example 1, the processed denim clothing has poor base gloss, poor texture clarity, and poor surface bleaching effect and back anti-staining effect; when only polyester polyether surfactant is added in Comparative Test Example 2, the effect obtained is not much different from that of Test Example 1, but in actual production, since only polyester polyether surfactant is added as anti-dyeing powder, it is easy to cause breakage and blistering for stretch denim ready-made clothing, resulting in a large amount of losses;

[0104] It can be seen from Test Example 1 and Comparative Test Examples 3-4 that the components in the enzyme powder are indispensable. Whether ammonium sulfate or sodium chlorite is missing, the comprehensive performance of the processed denim clothing is significantly reduced. Specifically, the base color gloss of the processed denim clothing is poor, and the surface bleaching effect and the back anti-staining effect both show a certain downward trend; It can be seen from Test Example 1 and Comparative Test Example 6 that the components in the enzyme powder are irreplaceable. When adipic acid is used to replace citric acid, the surface bleaching effect of the processed denim clothing shows a significant downward trend, and the base color gloss and texture clarity are also poor;

[0105] It can be seen from Test Examples 1-3 and Comparative Test Example 5 that the mass fraction of the components in the enzyme powder will also significantly affect the comprehensive performance of the processed denim clothing. When the mass fraction of the enzyme powder components in Comparative Test Example 5 is not within the scope of the present invention, the base color gloss and texture clarity of the processed denim clothing are poor.

[0106] Effect Example 2

[0107] The water volume, time and steam volume used in the processing of Experimental Example 1 and Comparative Experimental Examples 7-8 are shown in Table 3. The process time does not include the time for drainage, heating and feeding.

[0108] Table 3

[0109] Technology Process time Process water / ton Test Example 1 One-step fermentation and rinsing 78 2.3 Comparative Test Example 7 Two-step process of enzyme washing and bleaching 96 6.0 Comparative Test Example 8 Two-step process of enzyme washing and bleaching 103 3.1

[0110] It can be seen from Table 3 that compared with traditional water washing, the technical solution provided by the present invention can significantly shorten the process operation time and improve production efficiency, while also significantly reducing process water, thereby saving energy; compared with the traditional comparative test example 7, the method of the present invention can save 18 minutes and 3.7 tons of water in processing one-machine denim clothing.

[0111] Finally, it should be noted that the above embodiments are intended to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. An enzyme powder, characterized in that: The enzyme powder comprises the following components in parts by weight: 5-15 parts of neutral enzyme powder, 20-40 parts of anti-dye powder, 5-15 parts of ammonium sulfate, 0-20 parts of anhydrous sodium sulfate, 25-45 parts of sodium chlorite, 10-25 parts of citric acid; The anti-dyeing powder comprises polyester polyether surfactant and perpega.

2. The enzyme powder according to claim 1, characterized in that: The enzyme powder comprises the following components in parts by weight: 8-12 parts of neutral enzyme powder, 28-32 parts of anti-dye powder, 8-12 parts of ammonium sulfate, 8-12 parts of anhydrous sodium sulfate, 33-37 parts of sodium chlorite, and 14-18 parts of citric acid.

3. The enzyme powder according to claim 1, characterized in that: In the anti-dyeing powder, the mass ratio of the polyester polyether surfactant to Pingpingjia is 1:

1.

4. The method for preparing the enzyme powder according to any one of claims 1 to 3, characterized in that: The preparation method comprises the following steps: adding citric acid, ammonium sulfate, anti-dyeing powder, neutral enzyme powder and sodium chlorite into anhydrous sodium sulfate in sequence and mixing them evenly to obtain enzyme powder.

5. The preparation method according to claim 4, characterized in that: The preparation method comprises the following steps: adding citric acid to anhydrous sodium sulfate, stirring at a speed of 10-25 r / min for 3-5 min, then adding ammonium sulfate and stirring at a speed of 10-25 r / min for 3-5 min, then adding anti-dye powder and neutral enzyme powder and stirring at a speed of 10-25 r / min for 5-6 min, then adding sodium chlorite and stirring at a speed of 5-15 r / min until the mixture is uniformly mixed; finally, turning off the stirring, cooling to below 25° C., and packaging to obtain enzyme powder.

6. Use of the enzyme powder as described in any one of claims 1 to 3 in the fermentation grinding and rinsing process of denim clothing.

7. A fermentation grinding and bleaching one-bath process, characterized in that: The process comprises the following steps: (1) adding the denim clothing into water and then adding the enzyme powder as described in any one of claims 1 to 3 to perform a first heat preservation treatment; (2) After the first heat preservation treatment, the temperature is raised to perform the second heat preservation treatment; (3) After the second heat preservation treatment is completed, the working liquid is drained, and then water is added for rinsing. After the rinsing is completed, the rinsed denim clothing is dehydrated and dried to obtain the processed denim clothing.

8. The fermentation grinding and bleaching one-bath process according to claim 7, characterized in that: In the step (1), the added amount of enzyme powder is 0.5-1.5% owf.

9. The fermentation grinding and bleaching one-bath process according to claim 7, characterized in that: In the step (1), the mass volume ratio of the denim clothing to water is (100-120) kg: (700-850) L.

10. The fermentation grinding and bleaching one-bath process according to claim 7, characterized in that: The temperature of the first heat preservation treatment is 23-27° C., and the time of the first heat preservation treatment is 30-40 minutes; the temperature of the second heat preservation treatment is 30-40° C., and the time of the second heat preservation treatment is 30-40 minutes.

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