Microorganism cultivation dyeing-based flower gray fabric and preparation method thereof

Abstract

The invention relates to the technical field of fabrics, and particularly discloses a yellowish gray fabric based on microbial cultivation dyeing and a preparation method of the yellowish gray fabric. The preparation method comprises the following steps: S1, preparing a nutrient solution; s2, microbial culture: inoculating and culturing an aspergillus niger strain in a nutrient solution to obtain a culture solution containing aspergillus niger for later use; s3, inoculating raw materials with microorganisms: uniformly treating the culture solution containing aspergillus niger onto cotton fibers; s4, culturing and coloring: culturing, growing and coloring aspergillus niger on the cotton fibers in situ to obtain plaque colored cotton fibers; s5, spinning: performing opening picking, cotton carding and spinning on the plaque colored cotton fibers to obtain dyed yarns; s6, weaving, wherein the dyed yarn is subjected to fabric weaving, scouring and bleaching and sizing, and the gray fabric is obtained. The flower grey fabric prepared by in-situ growth of the aspergillus niger on the cotton fibers is stable and controllable in color, good in washing color fastness and rubbing color fastness, and green and environment-friendly in production process.

Description

Technical Field

[0001] The present invention relates to the technical field of fabrics, and specifically discloses a variegated grey fabric based on microbial cultivation and dyeing and a preparation method thereof. Background Art

[0002] Variegated grey belongs to a unique fabric style, and its yarn preparation method is to use different colored fibers for blending. Its fabric is made by using different component yarns and dyes in combination, or by using printing means. Fabrics of this style are very popular in the market due to their unique visual effects and rich layering.

[0003] There are some deficiencies in the existing methods of using blending or printing to prepare variegated grey fabrics. The patterns are relatively unstable, and it is difficult to form a natural and irregular variegated grey style. Moreover, the dyes used in such processes are all synthetic dyes, which consume a large amount of organic auxiliaries. This not only increases the production cost, but also causes a greater burden on the environment. Therefore, it is of great practical significance to develop an environmentally friendly and aesthetically pleasing preparation method for variegated grey fabrics. Summary of the Invention

[0004] There are many microorganisms in nature that can produce color pigments without the need to input chemical raw materials, including bacteria and fungi. The pigment-producing characteristics of these microorganisms are less restricted by environmental factors, the conditions are easy to control, and the types of microorganisms that can produce pigments are rich, having the advantage of sustainable development and utilization. Therefore, the characteristics of microorganisms producing colors can be used to color fabrics, yarns or fibers, which is not only environmentally friendly, but also can solve the problem of insufficient supply of natural dyes.

[0005] The currently known microbial dyeing technologies are mainly divided into two types: extract dyeing and cell body dyeing. Extract dyeing is to culture microorganisms in a liquid medium. After a certain period of fermentation, the microorganisms metabolize a large amount of pigments, and then the pigments are extracted through steps such as filtration, extraction, and concentration. This process is cumbersome and costly, limiting its large-scale application. Cell body dyeing is to culture microorganisms for a period of time to make them produce a large amount of pigments, and then put them into a sterile fabric for mordant dyeing. Although cell body dyeing is time-saving, labor-saving and easy to operate, it is limited to microorganisms that produce water-soluble natural pigments and cannot be used on a large scale.

[0006] This solution proposes a new process route. Synthetic dyes are not used in the process. Utilizing the characteristics of natural microorganisms to produce colors, the microorganisms that produce pigments, biological enzymes and raw materials are cultured together under suitable conditions to achieve the purpose of pretreatment and coloring of cellulose fibers. By in-situ production and coloring of cellulose fibers, and then blending and weaving with other colored and type fibers in different proportions, a variegated grey fabric can be obtained.

[0007] The preparation method of microbial fermentation dyeing of the present invention is for in-situ growth dyeing of cellulose fibers. Nutrients are provided through carbon sources and nitrogen sources under suitable temperature and acid-base environments, and Aspergillus niger grows stably on cotton fibers. Since some Aspergillus niger can produce amylase, acid protease, cellulase pectinase, glucose oxidase, etc. by itself, it plays a role in slowly hydrolyzing impurities such as pectin on cotton yarns, which is beneficial for coloring and color fastness. At the same time, Aspergillus niger produces pigments. As time goes by, the pigments on the surface of the raw materials accumulate continuously and help the cellulose raw materials to be colored. Moreover, as time increases, the depth also deepens. The color depth of the microbially dyed cotton fibers can be controlled by the dosage of the microorganisms put in. The depth and color of the variegated gray presented by the yarn are determined by the mixing ratio, the depth of the microbially dyed fibers, and the color of the ordinary fibers.

[0008] The present invention specifically adopts the following technical solutions:

[0009] On the one hand, the present invention protects a preparation method of a variegated gray fabric based on microbial cultivation dyeing, including the following steps:

[0010] S1. Prepare the nutrient solution: The nutrient solution includes water, a carbon source, and a nitrogen source;

[0011] S2. Microbial culture: Inoculate and culture Aspergillus niger in the nutrient solution to obtain a culture solution containing Aspergillus niger for standby;

[0012] S3. Inoculate the raw materials with microorganisms: Uniformly treat the culture solution containing Aspergillus niger onto cotton fibers;

[0013] S4. Culture and color: Aspergillus niger is cultured and grows in-situ on the cotton fibers for coloring to obtain cotton fibers with plaque coloring;

[0014] S5. Spinning: Carry out opening, cleaning, carding, and spinning on the cotton fibers with plaque coloring to obtain dyed yarns;

[0015] S6. Weaving: Carry out fabric weaving, boiling, bleaching, and setting on the dyed yarns to obtain a variegated gray fabric.

[0016] Preferably, the carbon source in S1 includes but is not limited to the following substances and dosages: glucose 0 - 30 g / L, fructose 0 - 15 g / L, soluble starch 0 - 5 g / L.

[0017] Preferably, the nitrogen source includes but is not limited to the following substances and dosages: singeing water 0 - 10 g / L, ammonium sulfate 0 - 10 g / L, soybean powder 0 - 10 g / L, various amino acids 0 - 10 g / L.

[0018] Preferably, in the step S2, the dosage of Aspergillus niger strain in the culture medium is 1-10 g / L, the pH of the culture medium is 3-9, the pH buffer can be composed of acetic acid / sodium acetate, and it is cultured at 26±2°C for 60-120 min.

[0019] Preferably, in the step S3, the prepared culture medium containing Aspergillus niger is uniformly sprayed onto the cotton fiber at a dosage of 1-5 L / kg.

[0020] Preferably, in the step S4, the cotton fiber with the culture medium containing Aspergillus niger is sealed and cultured at 26±2°C for 1-28 d.

[0021] Preferably, the spinning in the step S5 is the blending of the plaque-colored cotton fiber and the non-plaque-colored cotton fiber.

[0022] Preferably, the blending ratio of the plaque-colored cotton fiber to the non-plaque-colored cotton fiber is (1-100):(0-99).

[0023] Preferably, the non-plaque-colored cotton fiber is a mixture of one or more of cotton, hemp, wool, silk, polyester, and nylon.

[0024] Preferably, the color of the non-plaque-colored cotton fiber includes any one of white, red, yellow, gray, and black, and the color of the gray flower gray fabric is any one of white gray, red gray, yellow gray, and black gray.

[0025] Preferably, in the step S6, the woven fabric is boiled and bleached with hot water at 80-95°C on a rope washing machine, and then the fabric is dried on a setting machine set at 140-170°C, and soft oil and color fixing agent are added to the setting machine for setting.

[0026] On the other hand, the present invention protects a gray flower fabric based on microbial cultivation and dyeing, which is obtained by using the cotton fiber colored in situ by Aspergillus niger and prepared by the above preparation method of the gray flower fabric based on microbial cultivation and dyeing through spinning, weaving, boiling and bleaching, and setting.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] The preparation method of the present invention uses Aspergillus niger for in-situ cultivation and coloring on cotton fibers. Different from synthetic dyes that require a large amount of chemical reagents, it reduces the emission of organic pollutants and decreases the damage to the ecological environment. The cultivation and coloring process does not require heating, and fermentation dyeing can be carried out only at low temperature. During this process, Aspergillus niger can continue to reproduce, and the fermentation broth can be recycled after dyeing, which conforms to the sustainable development dyeing production method. After microbial dyeing, there is no need to inactivate the microorganisms separately, and they can be inactivated incidentally during subsequent scouring, bleaching, degreasing, or heat setting processes. By spinning and weaving the plaque-colored cotton fibers obtained by in-situ growth of Aspergillus niger on cotton fibers, the obtained variegated gray fabric not only has stable and controllable colors but also has good color fastness to washing and rubbing. Detailed Embodiments

[0029] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with specific embodiments.

[0030] Example 1

[0031] A variegated gray fabric based on microbial cultivation dyeing and its preparation method. The preparation method includes the following steps:

[0032] S1. Prepare the nutrient solution: Add 100 L of water, 5 g / L of glucose, 5 g / L of bioenzyme, and 5 g / L of soybean powder to a sterilized stainless steel barrel, stir to dissolve them completely, and add water to 250 L to obtain the nutrient solution for standby.

[0033] S2. Microbial cultivation: Take 1 kg of Aspergillus niger essence and add it to 250 L of culture solution to prepare a 4 g / L Aspergillus niger culture solution, adjust the pH to 7, and keep it at a constant temperature of 26 °C and oscillate for 1 h for standby.

[0034] S3. Inoculate the raw materials with microorganisms: Spray the prepared culture solution containing Aspergillus niger evenly onto 1000 kg of cotton fibers at a dosage of 2 L / kg.

[0035] S4. Cultivate and color: Seal the cotton fibers with Aspergillus niger culture solution in a constant temperature room at 26 °C and cultivate for 14 days for in-situ cultivation, growth, and coloring to obtain plaque-colored cotton fibers.

[0036] S5. Spinning: Open and clean the plaque-colored cotton fibers and wool staple fibers separately, and obtain black-cotton sliver and ordinary wool sliver respectively. Then, co-draw 40% black-cotton sliver and 60% wool sliver to obtain cotton / wool blended roving and 20S fine yarn dyed yarn.

[0037] S6. Weaving: Weave the above-mentioned fine yarn into a fabric by the weaving method shown in Table 1 below.

[0038] Table 1

[0039]

[0040]

[0041] Use 50°C hot water on a rope washing machine, with a machine speed of 20 m / min, wash for 30 min, then dry the fabric on a setting machine set at 150°C, add 50 g / L soft oil and 10 g / L fixing agent to the setting machine for final setting, giving the fabric a soft handfeel to obtain a flower grey fabric.

[0042] Example 2

[0043] A flower grey fabric based on microbial cultivation dyeing and its preparation method. The preparation method includes the following steps:

[0044] S1. Prepare the nutrient solution: Add 100 L of water, 5 g / L of glucose, 5 g / L of bioenzyme and 5 g / L of soybean powder to a stainless steel barrel, stir to completely dissolve it, and add water to 250 L to obtain the nutrient solution for standby.

[0045] S2. Microbial culture: Take 2 kg of Aspergillus niger essence and add it to 250 L of culture solution to prepare an 8 g / L Aspergillus niger culture solution, adjust the pH to 7, and keep it at a constant temperature of 26°C and oscillate for 1 h for standby.

[0046] S3. Inoculate the raw materials with microorganisms: Evenly spray the prepared culture solution containing Aspergillus niger onto 1000 kg of cotton fibers at a dosage of 2 L / kg.

[0047] S4. Culture and coloration: Seal the cotton fibers with Aspergillus niger culture solution in a constant temperature room at 26°C for 14 days for in-situ culture growth and coloration to obtain plaque-colored cotton fibers.

[0048] S5. Spinning: Open and clean, and card the plaque-colored cotton fibers and ordinary cotton fibers respectively to obtain Aspergillus niger cotton sliver and ordinary cotton sliver, and co-draw 20% Aspergillus niger cotton sliver and 80% ordinary cotton sliver to obtain a blended roving of Aspergillus niger cotton / ordinary cotton and a dyed yarn of 20S fine yarn.

[0049] S6. Weaving: Weave the above fine yarn into a fabric by the weaving method as in Example 1, add 5 g / L of caustic soda, 6 g / L of hydrogen peroxide and 1 g / L of penetrant in a flat screen soaping machine for boiling and bleaching, then dry the fabric on a setting machine set at 150°C, add 50 g / L of soft oil and 10 g / L of fixing agent to the setting machine for final setting, giving the fabric a soft handfeel to obtain a flower grey fabric.

[0050] Comparative Example 1

[0051] A microbial mordant dyeing white grey fabric and its preparation method. The preparation method includes the following steps:

[0052] S1. Preparation of nutrient solution: Add 100 L of water, 5 g / L of glucose, 5 g / L of bioenzyme, and 5 g / L of soybean powder into a stainless-steel barrel, stir to dissolve them completely, and then add water to make up to 250 L to obtain the nutrient solution for standby.

[0053] S2. Microorganism culture: Take 2 kg of Aspergillus niger essence and add it to 250 L of culture medium to prepare an Aspergillus niger culture medium with a concentration of 8 g / L, adjust the pH to 7, and keep it in a constant-temperature shaker at 26 °C for 1 h for standby.

[0054] S3. Dyeing: Soak the cotton fibers in the Aspergillus niger culture medium and add 1 g / L of praseodymium chloride, and carry out dyeing at 50 °C for 120 min.

[0055] S4. Spinning: Open and clean the Aspergillus niger-dyed cotton fibers and ordinary cotton fibers respectively, and card them respectively to obtain Aspergillus niger cotton sliver and ordinary cotton sliver. Then, co-draw 20% of the Aspergillus niger cotton sliver and 80% of the ordinary cotton sliver to obtain a blended roving of Aspergillus niger cotton / ordinary cotton and 20S yarn.

[0056] S5. Weaving: Weave the above-mentioned yarn into a fabric by the weaving method as in Example 1. Add 5 g / L of caustic soda, 6 g / L of hydrogen peroxide, and 1 g / L of penetrant in a flat-width soaping machine for scouring and bleaching. Then, dry the fabric on a setting machine set at 150 °C, and add 50 g / L of soft oil and 10 g / L of fixing agent in the setting machine for setting to give the fabric a soft hand feeling and obtain a light grayish flower fabric.

[0057] Performance testing

[0058] 1. Dyeing performance testing:

[0059] Use a DataColor tester to test the K / S value of the fabrics obtained in the above examples and comparative examples. The test results are shown in Table 2:

[0060] Table 2

[0061] K / S value Sampling point 1 Sampling point 2 Sampling point 3 Example 1 14.818 14.810 14.800 Example 2 13.517 13.506 13.456 Comparative example 1 6.426 6.135 6.034

[0062] 2. Washing fastness performance testing:

[0063] According to GB / T 3921-2008, test the washing fastness of the fabrics obtained in the above examples and comparative examples. The test results are shown in Table 3:

[0064] Table 3

[0065]

[0066]

[0067] 3. Rubbing color fastness performance testing:

[0068] The fabrics obtained from the above examples and comparative examples were tested for rubbing color fastness according to GB / T 3920, and the test results are shown in Table 4:

[0069] Table 4

[0070]

[0071] 4. Detection of the breaking strength performance of single yarn in roving:

[0072] The fabrics obtained from the above examples and comparative examples were tested for the breaking strength of single yarn in roving according to GB / T 3916-2013, and the test results are shown in Table 5:

[0073]

[0074]

[0075] From the above test performance results, it can be seen that the breaking strength of single yarn in Examples 1 and 2 is almost the same as that of normal cotton yarn of the same count, meeting the strength requirements for knitting yarn; the washing and rubbing color fastness are both good, the K / S value fluctuates little between different sampling points, and the color is stable. However, in Comparative Example 1, the dyed color is light and the effect of the fabric's variegated gray style is not ideal.

[0076] The new process route of this solution uses the method of in-situ cultivation and coloring of Aspergillus niger on cotton fibers in the production of variegated gray style fabrics. Compared with the traditional process route, it has the following advantages:

[0077] 1. Different from synthetic dyes that require a large amount of chemical reagents, it reduces the emission of organic pollutants and reduces the damage to the ecological environment;

[0078] 2. There is no need to raise the temperature, and fermentation dyeing can be carried out only at low temperature. During this process, Aspergillus niger can continue to reproduce, and the fermentation broth can be recycled after dyeing, meeting the sustainable development dyeing production method;

[0079] 3. During the fermentation dyeing process, biological enzymes are used to remove most of the natural impurities such as pectin and wax on the fiber surface, effectively improving the water absorption and capillary effect grade.

[0080] 4. There is no need to inactivate microorganisms separately, and they can be inactivated incidentally during the subsequent boiling, bleaching, degreasing or heat setting and temperature raising processes.

[0081] 5. After standardization, the variegated gray color is stable and controllable, and the overall color of the final fabric can be changed at will.

[0082] 6. For some variegated gray effects, the pretreatment and dyeing steps can even be omitted, saving energy and reducing consumption.

[0083] The above has introduced the technical solution provided by the present invention in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A method for preparing gray fabric based on microbial cultivation and dyeing, characterized in that: The following steps are involved: S1. Prepare nutrient solution: the nutrient solution includes water, a carbon source and a nitrogen source; S2, microbial culture: inoculate and culture the Aspergillus niger in a nutrient solution to obtain a culture solution containing the Aspergillus niger for later use; S3, inoculating microorganisms into raw materials: evenly treating the culture solution containing Aspergillus niger onto the cotton fibers; S4, culture and coloring: Aspergillus niger is cultured, grown and colored in situ on cotton fibers to obtain bacterial plaque colored cotton fibers; S5, spinning: opening, cleaning, combing and spinning the bacterial plaque-dyed cotton fibers to obtain dyed yarn; S6, weaving: weaving, bleaching and shaping the dyed yarn to obtain a gray fabric.

2. The method for preparing gray fabric based on microbial cultivation and dyeing according to claim 1, characterized in that: In S2, the amount of Aspergillus niger in the culture solution is 1-10 g / L, the pH of the culture solution is 3-9, and the culture is carried out at 26±2° C. for 60-120 min.

3. The method for preparing gray fabric based on microbial cultivation and dyeing according to claim 1, characterized in that: In the step S3, the prepared culture solution containing Aspergillus niger is sprayed uniformly onto the cotton fibers at a dosage of 1 to 5 L / kg.

4. The method for preparing gray fabric based on microbial cultivation and dyeing according to claim 1, characterized in that: In the S4, the cotton fiber with the culture solution of Aspergillus niger is sealed and cultured at 26±2° C. for 1 to 28 days.

5. The method for preparing gray fabric based on microbial cultivation and dyeing according to claim 1, characterized in that: The spinning in S5 is a blend of the bacterial plaque colored cotton fiber and the bacterial plaque-free colored cotton fiber.

6. The method for preparing gray fabric based on microbial cultivation and dyeing according to claim 5, characterized in that: The blending ratio of the bacterial plaque colored cotton fiber and the bacterial plaque-free colored cotton fiber is (1-100):(0-99).

7. The method for preparing gray fabric based on microbial cultivation and dyeing according to claim 5, characterized in that: The sterile spot-free colored cotton fiber is a mixture of one or more of cotton, linen, wool, silk, polyester and nylon.

8. The method for preparing gray fabric based on microbial cultivation and dyeing according to claim 5, characterized in that: The color of the sterile spot-free colored cotton fiber includes any one of white, red, yellow, gray, and black, and the color of the gray flower gray fabric is any one of white gray, red gray, yellow gray, and black gray.

9. The method for preparing gray fabric based on microbial cultivation and dyeing according to claim 1, characterized in that: In S6, the woven fabric is bleached in a rope washing machine using hot water at 80-95° C., and then dried in a setting machine set at 140-170° C., and softening oil and a color fixing agent are added to the setting machine for setting.

10. A gray fabric dyed by microbial cultivation, characterized in that: The method is obtained by using cotton fibers colored by in-situ growth of Aspergillus niger through spinning, weaving, scalding, bleaching and shaping.

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