Method for washing dyed fabric based on micro-nano bubble technology

Abstract

The invention belongs to the technical field of textile dyeing and finishing, and relates to a method for washing dyed fabric based on a micro-nano bubble technology, which comprises the following steps of: continuously injecting water containing micro-nano bubbles at the temperature of 10-80 DEG C into a washing tank or a dyeing vat in which the dyed fabric is placed by utilizing a micro-nano bubble generating device until the fabric is completely immersed in the water; the micro-nano bubbles are continuously generated to wash the dyed fabric for 30 seconds to 10 minutes, and the process of washing the fabric by using the water containing the micro-nano bubbles can be repeated according to the color fastness requirement of the washed and dyed fabric; the fabric contains any one fiber component of cellulosic fiber, wool and silk; the micro-nano bubbles are air bubbles, oxygen bubbles, hydrogen bubbles, nitrogen bubbles, helium bubbles or argon bubbles; the minimum diameter of the micro-nano bubbles is smaller than or equal to the pore diameter of micropores in fibers after the fabric is swelled. In the washing process, only micro-nano bubble water is used, a soaping agent is not used, the washing time is shortened to 30s-10min, and the color fastness of the washed fabric is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of textile dyeing and finishing, and relates to a method for washing fabric after dyeing based on micro-nano bubble technology. Background Art

[0002] Washing after dyeing is a crucial part of the textile dyeing and finishing industry, which aims to remove impurities such as unabsorbed dyes, acid and alkali substances, salts, surfactants, residual auxiliaries, etc. that remain on the fibers. However, the traditional washing method faces prominent problems such as high water and energy consumption, long process flow, low equipment efficiency, poor decontamination effect, waste of resources, and environmental pollution.

[0003] The defects of the traditional post-dyeing washing method are as follows: ① The traditional post-dyeing washing step usually requires a large amount of water to wash away the excess dyes and chemical additives on the textiles, and the surfactants added during the soaping process cause environmental pollution. ② The traditional post-dyeing washing process is energy-intensive. Usually, post-dyeing washing is carried out at high temperatures to promote the dissolution and removal of dyes, which results in high energy consumption to maintain the washing temperature.

[0004] The commonly used soap washing methods reported in the literature use 2g / L soaping agent, bath ratio 1:50, and high temperature soap washing for 20 minutes; the commonly used soap washing methods take a long time and consume a lot of energy. For example, literature 1 (New soap washing process for cotton fabric after dyeing and production and application of soap washing enzyme [J]. Knitting Industry, 2015, (01): 53-56.) mentions the traditional soap washing process, the polymer soap washing agent such as MA-AA soap washing process, the urea-H2O2 oxidation soap washing process, the mixed soap washing process and the enzyme washing process (i.e. washing without soap washing agent). The washing time of these processes is more than 15 minutes.

[0005] Reference 2 (Production practice of eco-enzyme treatment and short process of dyeing with new reactive dyes and soap-free post-treatment process [J]. Dyeing and Finishing Technology, 2024, 46 (02): 31-33.) mentions a soap-free post-treatment process after dyeing with the addition of Jager Partner ASP, which requires two water washes at 70°C and 10 min.

[0006] Reference 3 (Environmentally friendly reactive dye soap-free dyeing process [J]. Knitting Industry, 2022, (02): 54-57.) selected the GE and CRF series dyes of Yagesu and adopted the reactive dye soap-free dyeing method. By replacing soda ash with the high-efficiency auxiliary agent Yage companion ASP, high-temperature soap washing is not required after dyeing, and only a few water washes are needed to achieve the effect of removing floating color. However, the washing time is also more than 15 minutes.

[0007] The soaping time of the above-mentioned post-dyeing washing technology using soaping agents is usually around 15-20 minutes, and the shortest oxidation soaping process also requires an oxidation cleaning time of 10 minutes. At present, the washing process without soaping agents is to achieve the effect of soap-free by adding auxiliaries during the dyeing process using specific dyes. The post-dyeing washing time without soaping agents is usually more than 20 minutes.

[0008] Therefore, it is of great significance to study a green water washing method for fabric after dyeing based on micro-nano bubble technology to achieve source pollution reduction, green and low-carbon, energy saving and emission reduction, so as to solve the problems existing in the existing technology. Summary of the invention

[0009] The purpose of the present invention is to solve the problems existing in the prior art and provide a method for washing fabric after dyeing based on micro-nano bubble technology.

[0010] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0011] A method for washing dyed fabrics based on micro-nano bubble technology, which uses a micro-nano bubble generating device to continuously inject water containing micro-nano bubbles at a certain temperature into a washing tank or a dyeing vat where the dyed fabrics are placed until the fabrics are completely immersed in the water, and continuously generates micro-nano bubbles to wash the dyed fabrics for a certain period of time. According to the color fastness requirements of the washed dyed fabrics, the process of washing the fabrics with water containing micro-nano bubbles can be repeated;

[0012] The fabric is a fabric containing any one of the fiber components of cellulose fiber, wool and silk; the fabric containing cellulose fiber is cotton fabric, linen fabric, viscose fabric or tencel fabric;

[0013] The micro-nano bubbles are air bubbles, oxygen bubbles, hydrogen bubbles, nitrogen bubbles, helium bubbles or argon bubbles;

[0014] The minimum diameter of the micro-nano bubbles is less than or equal to the micropore diameter in the fiber after the fabric swells. The bubbles generated by the micro-nano bubble generator include micron bubbles and nano bubbles. The bubble size distribution is wide. The larger bubbles directly act on the fiber surface, and the smaller bubbles diffuse into the fiber. Therefore, it is necessary to ensure that the minimum diameter of the micro-nano bubbles is less than or equal to the internal pore diameter of the fiber after the fabric swells.

[0015] A certain temperature is greater than or equal to 10°C and less than 30°C, and a certain time is 5 to 10 minutes;

[0016] Alternatively, the certain temperature is greater than or equal to 30°C and less than 60°C, and the certain time is 2 to 5 minutes;

[0017] Alternatively, the certain temperature is greater than or equal to 60°C and less than or equal to 80°C, and the certain time is 30s to 5min;

[0018] The generation rate of deionized water containing micro-nano bubbles can be adjusted according to the actual needs of the production process, which is 10000mL / min~1000L / min, and the dynamic equilibrium concentration of micro-nano bubbles in the water is 50-300 million / mL. In the early stage, with the continuous injection of micro-nano bubbles, the bubble concentration in the washing tank will gradually increase. Once the concentration reaches a certain level, the bubbles in the liquid begin to diffuse in the working bath, enrich on the surface of the fiber fabric, diffuse in the fiber pores, collide with each other, aggregate, rupture or escape. At this time, the bubble generation rate and the rupture and escape rate tend to balance. When this dynamic equilibrium is achieved, the concentration of bubbles will no longer increase, the system will reach a stable state, and the concentration will remain at a relatively constant value.

[0019] Air bubbles, oxygen bubbles and hydrogen bubbles have redox properties and are destructive to fabrics or dyed dyes. Therefore, the dynamic equilibrium concentration of micro-nano bubbles in water should be less than or equal to 150 million / mL and controlled to be 50-150 million / mL.

[0020] For nitrogen bubbles, helium bubbles and argon bubbles, which are inert gases, in order to improve the washing effect, the dynamic equilibrium concentration of micro-nano bubbles in water should be greater than or equal to 150 million / mL and controlled to be 150-300 million / mL.

[0021] Micro-nano bubble technology refers to bubbles with diameters between microns and nanometers produced by physical and chemical means. Micro-nano bubbles are small in size and can form a delicate bubble layer on the surface of the fabric. When the fabric is immersed in a solution containing micro-nano bubbles, these tiny bubbles will collide with the surface of the fabric, generating mechanical impact. This process helps to strip off unreacted dye molecules and desorb them from the surface of the fabric or fiber pores. Since the gas-liquid interface formed by micro-nano bubbles in water has a greater attraction to anions than cations, many anions will gather at the gas-liquid interface, resulting in a negative charge on the surface of the micro-nano bubbles, which can adsorb some cationic substances, such as cationic surfactants and cationic additives.

[0022] The present invention proposes coordinated control of the diameter of the fiber after the fabric is swollen and the diameter of the bubbles, the gas properties and the dynamic equilibrium concentration of the bubbles applied, and the temperature and time: for the diameter of the fiber after different fabrics are swollen, the minimum diameter of the micro-nano bubbles is determined to ensure the cleanliness of the floating color in the fine pores inside the fiber; for the gas with redox properties, the dynamic equilibrium concentration of the micro-nano bubbles in the water is reduced to avoid damage to the fiber and the dye that has been dyed; for the inert gas, the dynamic equilibrium concentration of the micro-nano bubbles in the water is increased to improve the washing effect; for the relationship between temperature and time, the fiber damage caused by high-temperature and long-term washing is reduced and avoided.

[0023] As the preferred technical solution:

[0024] In the above-mentioned method for washing fabric after dyeing based on micro-nano bubble technology, the diameter of the micro-nano bubble is 30nm~100μm. The bubble size is controlled by adjusting the flow rate and pressure of the nano bubble generator. The size of the nano bubble used for washing is designed according to the fiber pore size. For example, for cotton fiber, the internal size of the fiber after moisture absorption and swelling is about 30~50nm, then the parameters are adjusted to generate as many micro-nano bubbles of 50nm and below as possible to wash the cotton fiber, which helps smaller micro-nano bubbles to diffuse into the fiber pores.

[0025] The minimum diameter of micro-nano bubbles used in different fabrics satisfies the following relationship:

[0026] The diameter of micropores in cotton fabric after swelling is 30-60 nm, so the minimum diameter of micro-nano bubbles is 30 nm;

[0027] The diameter of the micropores in the fibers after swelling of linen fabric is 40~60nm, so the minimum diameter of micro-nano bubbles is 40 nm;

[0028] The diameter of micropores in the fibers of viscose fabric after swelling is 40~80nm, so the minimum diameter of micro-nano bubbles is 40 nm;

[0029] The micropore diameter of Tencel fabric after swelling is 50~100nm, so the minimum diameter of micro-nano bubbles is 50nm;

[0030] The diameter of micropores in wool fabric after swelling is 80-120 nm, so the minimum diameter of micro-nano bubbles is 80 nm;

[0031] The diameter of the micropores in the silk fabric fibers after swelling is 70~100nm, so the minimum diameter of the micro-nano bubbles is 70 nm.

[0032] The above-mentioned method for washing fabric after dyeing based on micro-nano bubble technology uses a micro-nano bubble generating device to continuously generate micro-nano bubbles in a washing tank or a dyeing vat, which means that the water in the washing tank is continuously absorbed by the micro-nano bubble generating device to generate micro-nano bubbles and then re-introduced into the washing tank or the dyeing vat.

[0033] As described above, in a method for washing fabric after dyeing based on micro-nano bubble technology, the working flow of the micro-nano bubble generating device is 1000mL / min~1000L / min, the gas flow rate is 6mL / min~20mL / min, and the pressure is 0.4~2MPa.

[0034] As described above, the method for washing fabric after dyeing based on micro-nano bubble technology, the dyed fabric refers to fabric dyed with reactive dyes, direct dyes, acid dyes, cationic dyes, vat dyes or sulphur dyes, and the dyeing process is an immersion dyeing process or a pad dyeing process.

[0035] Invention mechanism:

[0036] In order to solve the problems of high energy consumption, long soaping time and environmental pollution caused by surfactants added during the soaping process in the traditional post-dyeing washing method in the prior art, the present invention creatively proposes a post-dyeing washing method based on micro-nano bubble technology. By combining micro-nano bubbles with post-dyeing washing, its innovation lies in the following aspects: ① Micro-nano bubble technology uses the physical effect of bubbles (such as the bursting effect of bubbles) to wash fabrics at room temperature for a short time to remove pollutants on its surface or inside the fiber, which is different from the traditional washing method of adding soaping agents and dispersants, high-temperature soaping for a long time and multiple batches, which effectively speeds up the washing process and greatly compresses the washing time. ② According to the internal pore size of different fibers, the distribution of micro-nano bubbles in the process is adjusted to meet the washing needs of different types of fabrics after dyeing. ③ Use micro-nano bubbles to wash away unreacted floating dyes, surfactants, and residual salt and alkali. The rapid mass transfer properties of micro-nano bubbles can wash away these substances without the use of soap detergents. Since soap detergents are not used in the washing process, the consumption of auxiliaries is greatly reduced, COD (chemical oxygen demand) and BOD (biochemical oxygen demand) are reduced at the source, achieving green and low-carbon, and significantly reducing environmental pollution. ④ Micro-nano bubbles have strong physical cleaning ability due to their ultra-small size and large specific surface area, and can more efficiently remove dyes, auxiliaries and other residues that are not completely fixed during the dyeing process. Compared with traditional soap washing, micro-nano bubbles can penetrate into the micropores of fibers and remove more unfixed dye molecules, surfactants and other pollutants through stronger physical cleaning. This can effectively reduce the impact of these residues on dye fastness, prevent the color fastness of dyes from decreasing due to reaction or deposition with uncleared residues, and effectively replace and remove odor gas molecules adsorbed between fibers.

[0037] The prior art discloses the use of micro-nano bubbles to wash fabrics, most of which are mainly used to wash oil stains on fabrics, such as patent CN202010626627.3. Since oil stains are difficult to dissolve in water, this type of technology requires the use of soap detergent or detergent; while another part of the washing technology is mainly used for the disinfection of fabrics. This type of technology relies on the strong oxidizing property of the gas in the micro-nano bubbles to achieve the disinfection effect.

[0038] The method disclosed in the prior art for preparing ozone micro-nano bubbles to treat dye wastewater after dyeing, such as patent CN201810011704.7, only treats the wastewater after dyeing, and the system does not contain fabrics. In addition, the use of ozone micro-nano bubbles is to achieve the washing effect through its strong oxidizing property. Ozone micro-nano bubbles can decompose organic matter, remove odors, and destroy the cell membranes of microorganisms. They have a strong killing effect on pollutants and microorganisms such as bacteria. If the dyed fabric is directly washed with water using this technology, ozone may directly act on the dyes on the fabric to destroy the dye chromophores and cause washing.

[0039] Beneficial effects:

[0040] (1) A method for washing fabrics after dyeing based on micro-nano bubble technology of the present invention does not use soaping agent during the washing process, and the washing time is reduced to 30s to 10min;

[0041] (2) The present invention provides a method for washing fabrics after dyeing based on micro-nano bubble technology. The micro-nano bubble technology is introduced into washing after dyeing. The micro-nano bubbles used for washing are high-density micro-nano bubbles with a concentration of 50-300 million / mL and a diameter of 30nm-100μm. This method can not only improve the effect of removing floating colors and improve various fastnesses, but also greatly save water, energy and time, optimize the utilization of water resources, and reduce energy consumption, thus having significant economic and environmental benefits.

[0042] (3) The present invention provides a method for washing fabrics after dyeing based on micro-nano bubble technology. The color fastness of the fabrics after washing with micro-nano bubbles is improved compared with the traditional soap washing method. DETAILED DESCRIPTION

[0043] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0044] The test methods involved in the performance indicators in the embodiments and comparative examples of the present invention are as follows:

[0045] Color fastness to washing with soap: Color fastness to washing with soap is tested according to the test method in GB / T 3921-2008 "Textiles - Tests for Color Fastness - Color Fastness to Washing with Soap". The specific process is as follows:

[0046] (1) Sample preparation: Take a 10 cm × 4 cm sample and sandwich it between two pieces of standard adjacent fabrics of 10 cm × 4 cm. Sew the four sides together to form a combined sample (the adjacent fabrics for cotton fabric are cotton and viscose fibers; the adjacent fabrics for linen fabric are linen fabric and viscose fibers; the adjacent fabrics for viscose fabric and Tencel fabric are viscose fiber fabric and cotton fabric; the adjacent fabrics for wool fabric are cotton fabric and wool fabric; the adjacent fabrics for silk fabric are silk fabric and cotton fabric).

[0047] (2) Preparation of soap solution: Prepare 5g of standard soap flakes and 2g of anhydrous Na2CO3 per liter of distilled water, heat until completely dissolved and the solution becomes a transparent colloid.

[0048] (3) Pour water into the preheating barrel and working barrel of the soap washing machine to the marked water level, and set the temperature so that the water temperature in the working barrel reaches 60℃+2℃.

[0049] (4) Weigh the combined sample and measure the volume of soap solution according to the bath ratio of 1:50.

[0050] (5) Put the soap solution and the combined sample into a steel cup, put it into a preheating barrel for 30 minutes, then put it into a working barrel, set the test time to 30 minutes, and start the test. After the test, take out the sample, wash off the soap solution with water, cut the suture thread, and put it into an oven set at 80°C for drying.

[0051] (6) Use the grey colorimetric card to evaluate the color staining of the sample’s backing fabric.

[0052] The fiber sources used in the examples are as follows:

[0053] The cotton fabric is mercerized cotton, provided by Shandong Lutai Textile Co., Ltd.;

[0054] The linen fabric is a standard adjacent fabric ramie fabric, purchased from Min Testing Instruments (Shanghai) Co., Ltd.;

[0055] The viscose fabric is a standard adjacent fabric viscose fabric purchased from Min Testing Instrument (Shanghai) Co., Ltd.;

[0056] Tencel fabric was purchased from Lenzing Fibers GmbH;

[0057] The wool fabric was a standard adjacent fabric viscose fabric purchased from Min Testing Instruments (Shanghai) Co., Ltd.;

[0058] The silk fabric was a standard adjacent fabric viscose fabric purchased from Min Testing Instruments (Shanghai) Co., Ltd.

[0059] The fabric strength after washing is tested in accordance with the requirements of GB / T 3923.1-2013 "Tensile properties of textile fabrics Part 1: Determination of breaking strength and elongation at break (strip method)".

[0060] The color difference after washing is calculated according to the requirements of ISO 105-J03:2009 "Textiles - Tests for color fastness - Part J03: Calculation of color difference".

[0061] Example 1

[0062] A method for washing fabric after dyeing based on micro-nano bubble technology, the specific process is as follows:

[0063] (1) Using a micro-nano bubble generator, continuously inject water containing oxygen micro-nano bubbles at 80° C. into a washing tank containing dyed cotton fabric until the fabric is completely submerged in the water;

[0064] The diameter of oxygen micro-nano bubbles is 30nm~100μm, the water generation rate of oxygen micro-nano bubbles is 50 L / min, and the dynamic equilibrium concentration of oxygen micro-nano bubbles in the water washing tank is 130 million / mL; the working flow rate of the micro-nano bubble generating device is 50 L / min, the gas flow rate is 0.5 L / min, and the pressure is 1 MPa;

[0065] (2) The water in the washing tank is continuously sucked by the micro-nano bubble generator to generate oxygen micro-nano bubbles and then re-introduced into the washing tank to wash the dyed cotton fabric for 5 minutes;

[0066] Among them, the smaller pore size inside the cotton fabric after swelling in water is concentrated in the range of 30~60nm.

[0067] For cotton fabrics dyed with reactive dye blue K-BF, the color fastness to soap washing after traditional soap washing is level 4, and the color fastness to washing with micro-nano bubbles reaches level 4-5. There is no significant decrease in fabric strength and no significant change in fabric color when washing with micro-nano bubbles compared with traditional soap washing (CIEΔE=0.8); for cotton fabrics dyed with reactive dye yellow K-3RS, the color fastness to soap washing after traditional soap washing is level 4, and the color fastness to washing with micro-nano bubbles reaches level 4-5. There is no significant decrease in fabric strength and no significant change in fabric color when washing with micro-nano bubbles compared with traditional soap washing (CIEΔE=0.8); for cotton fabrics dyed with reactive dye red K-3BS, the color fastness to soap washing after traditional soap washing is level 4-5, and the color fastness to washing with micro-nano bubbles is level 4-5 For cotton fabrics dyed with vat dye vat blue 6, the color fastness to soap washing is 4-5 after traditional soap washing, and the color fastness to soap washing with micro-nano bubbles is 5. Compared with traditional soap washing, the strength of the fabric has not decreased significantly, and the color of the fabric has not changed significantly (CIEΔE=0.8); for cotton fabrics dyed with sulfur dye sulfur B3R red-brown, the color fastness to soap washing is 3-4 after traditional soap washing, and the color fastness to soap washing with micro-nano bubbles is 4. Compared with traditional soap washing, the strength of the fabric has not decreased significantly, and the color of the fabric has not changed significantly (CIEΔE=0.8).

[0068] Comparative Example 1

[0069] A method for washing fabric after dyeing based on micro-nano bubble technology is basically the same as Example 1, except that the gas flow rate is 1.2 L / min and the pressure is 1.5 MPa; at this time, the dynamic equilibrium concentration of oxygen micro-nano bubbles in the washing tank is 250 million / mL;

[0070] The test shows that when cotton fabric is dyed with the reactive dye yellow K-3RS and washed with micro-nano bubbles and compared with traditional soap washing, the strength of the fabric decreases by 20%, and the color of the fabric becomes visibly lighter (CIEΔE=1.2). Compared with Example 1 and Comparative Example 1, the mechanical properties of the fabric after washing are significantly reduced, and the color becomes significantly lighter. This is because oxygen, as a gas with certain oxidizing properties, will destroy the cellulose molecular chains of the cotton fabric when the concentration of micro-nano bubbles is high, resulting in strength damage. On the other hand, it will also cause the dyed dye to be oxidized, destroy the chromophore group, and make the color lighter.

[0071] Example 2

[0072] A method for washing fabric after dyeing based on micro-nano bubble technology, the specific process is as follows:

[0073] (1) Using a micro-nano bubble generator, continuously injecting water containing hydrogen micro-nano bubbles at 70° C. into a washing tank containing dyed linen fabrics until the fabrics are completely submerged in the water;

[0074] The diameter of hydrogen micro-nano bubbles is 40nm~80μm, the water generation rate containing hydrogen micro-nano bubbles is 120 L / min, and the dynamic equilibrium concentration of hydrogen micro-nano bubbles in the water washing tank is 138 million / mL; the working flow rate of the micro-nano bubble generation device is 120 L / min, the gas flow rate is 1 L / min, and the pressure is 1.5MPa;

[0075] (2) The water in the washing tank is continuously sucked by the micro-nano bubble generator to generate hydrogen micro-nano bubbles and then re-introduced into the washing tank to wash the dyed linen fabric for 2 minutes;

[0076] Among them, the smallest pore size inside the linen fabric after swelling in water is concentrated in the range of 40~60nm.

[0077] For linen fabrics dyed with direct dye Direct Red 23, the color fastness to soap washing after traditional soap washing is level 4, and the color fastness to soap washing with micro-nano bubbles reaches level 4-5. There is no significant decrease in fabric strength and no significant change in fabric color when washing with micro-nano bubbles compared with traditional soap washing (CIEΔE=0.7); for linen fabrics dyed with Direct Blue 71, the color fastness to soap washing after traditional soap washing is level 4, and the color fastness to soap washing with micro-nano bubbles reaches level 4-5. There is no significant decrease in fabric strength and no significant change in fabric color when washing with micro-nano bubbles compared with traditional soap washing (CIEΔE=0.8).

[0078] Comparative Example 2

[0079] A method for washing fabric after dyeing based on micro-nano bubble technology is basically the same as Example 2, except that: the dyed linen fabric is washed for 10 minutes;

[0080] The test shows that for linen fabrics dyed with direct dye Direct Red 23, the color fastness to soap washing after traditional soap washing is level 4, and the color fastness to soap washing with micro-nano bubbles reaches level 4-5. Compared with traditional soap washing, the strength of the fabric decreased by 15% after washing with micro-nano bubbles, and the color of the fabric changed visibly to the naked eye (CIEΔE=1.1). Compared with Example 2, the mechanical properties of the fabric after washing in Comparative Example 2 were significantly reduced, and the color became significantly lighter. This is because hydrogen, as a gas with certain reducing properties, will destroy the cellulose molecular chains of the linen fabric at high temperature (70°C) for 10 minutes, resulting in damage to the strength. On the other hand, it will also reduce the dye that has been dyed, destroy the chromophore group, and cause the color change.

[0081] Example 3

[0082] A method for washing fabric after dyeing based on micro-nano bubble technology, the specific process is as follows:

[0083] (1) Using a micro-nano bubble generator, continuously inject water containing nitrogen micro-nano bubbles at 60° C. into a washing tank containing dyed cotton fabric until the fabric is completely submerged in the water;

[0084] The diameter of nitrogen micro-nano bubbles is 30nm~80μm, the water generation rate containing nitrogen micro-nano bubbles is 15 L / min, and the dynamic equilibrium concentration of nitrogen micro-nano bubbles in the water washing tank is 300 million / mL; the working flow rate of the micro-nano bubble generation device is 15 L / min, the gas flow rate is 180 L / min, and the pressure is 2 MPa;

[0085] (2) The water in the washing tank is continuously sucked by the micro-nano bubble generator to generate nitrogen micro-nano bubbles and then re-introduced into the washing tank to wash the dyed cotton fabric for 30 seconds;

[0086] Among them, the smaller pore size inside the cotton fabric after swelling in water is concentrated in the range of 30~60nm.

[0087] For cotton fabrics dyed with reactive dye reactive scarlet KE-3B, the color fastness to soap washing after traditional soap washing is level 3, and the color fastness to soap washing with micro-nano bubbles reaches level 3-4. There is no significant decrease in fabric strength and no significant change in fabric color when washing with micro-nano bubbles compared with traditional soap washing (CIEΔE=0.8); for cotton fabrics dyed with reactive dye reactive turquoise blue KN-G, the color fastness to soap washing after traditional soap washing is level 2, and the color fastness to soap washing with micro-nano bubbles reaches level 2-3. There is no significant decrease in fabric strength and no significant change in fabric color when washing with micro-nano bubbles compared with traditional soap washing (CIEΔE=0.8).

[0088] Example 4

[0089] A method for washing fabric after dyeing based on micro-nano bubble technology, the specific process is as follows:

[0090] (1) Using a micro-nano bubble generator, continuously injecting 50° C. water containing helium micro-nano bubbles into a washing tank containing dyed viscose fabric until the fabric is completely submerged in the water;

[0091] Among them, the diameter of helium micro-nano bubbles is 30nm~95μm, the water generation rate containing helium micro-nano bubbles is 1000 mL / min, the dynamic equilibrium concentration of helium micro-nano bubbles in the water washing tank is 260 million / mL, the working flow of the micro-nano bubble generation device is 1000 L / min, the gas flow rate is 12 mL / min, and the pressure is 1.5MPa;

[0092] (2) The water in the washing tank is continuously sucked by the micro-nano bubble generator to generate helium micro-nano bubbles and then re-introduced into the washing tank to wash the dyed fabric for 5 minutes;

[0093] Among them, the smaller pore size inside the viscose fabric after swelling in water is concentrated in the range of 40~80nm.

[0094] For the viscose fabric dyed with reactive dye blue K-BF, the color fastness to soap washing is level 4 after traditional soap washing, and the color fastness to soap washing with micro-nano bubbles reaches level 4-5. Compared with traditional soap washing, the strength of the fabric does not decrease significantly after washing with micro-nano bubbles, and the color of the fabric does not change significantly (CIEΔE=0.8); for the reactive dye reactive red KE-3B For the viscose fabrics dyed with active dye active turquoise blue KN-G, the color fastness to soap washing is level 2 after traditional soap washing, and the color fastness to soap washing with micro-nano bubbles reaches level 3-4. There is no significant decrease in fabric strength and no significant change in fabric color when washing with micro-nano bubbles compared with traditional soap washing (CIEΔE=0.7). For the viscose fabrics dyed with active dye active turquoise blue KN-G, the color fastness to soap washing is level 2 after traditional soap washing, and the color fastness to soap washing with micro-nano bubbles reaches level 2-3. There is no significant decrease in fabric strength and no significant change in fabric color when washing with micro-nano bubbles compared with traditional soap washing (CIEΔE=0.7).

[0095] Example 5

[0096] A method for washing fabric after dyeing based on micro-nano bubble technology, the specific process is as follows:

[0097] (1) Using a micro-nano bubble generator, continuously injecting water containing argon micro-nano bubbles at 75° C. into a washing tank containing dyed Tencel fabric until the fabric is completely submerged in the water;

[0098] The diameter of argon micro-nano bubbles is 40nm~100μm, the water generation rate containing argon micro-nano bubbles is 1500 mL / min, and the dynamic equilibrium concentration of argon micro-nano bubbles in the water washing tank is 200 million / mL; the working flow rate of the micro-nano bubble generation device is 1500 mL / min, the gas flow rate is 20 mL / min, and the pressure is 1.8 MPa;

[0099] (2) The water in the washing tank is continuously sucked by the micro-nano bubble generating device to generate argon micro-nano bubbles and then re-introduced into the washing tank to wash the dyed Tencel fabric for 5 minutes;

[0100] Among them, after Tencel fabric swells in water, the smaller pore size inside is concentrated in 50~100nm.

[0101] For Tencel fabrics dyed with reactive dye blue K-BF, the color fastness to soap washing after traditional soap washing is level 4, and the color fastness to soap washing with micro-nano bubbles reaches level 4-5. There is no significant decrease in fabric strength and no significant change in fabric color after washing with micro-nano bubbles compared with traditional soap washing (CIEΔE=0.8); for Tencel fabrics dyed with reactive dye yellow K-3RS, the color fastness to soap washing after traditional soap washing is level 3-4, and the color fastness to soap washing with micro-nano bubbles reaches level 4. There is no significant decrease in fabric strength and no significant change in fabric color after washing with micro-nano bubbles compared with traditional soap washing (CIEΔE=0.8); for Tencel fabrics dyed with reactive dye red K-3BS, the color fastness to soap washing after traditional soap washing is level 4-5, and the color fastness to soap washing with micro-nano bubbles is 4 -5, using micro-nano bubbles for washing and comparing with traditional soap washing, there is no significant decrease in fabric strength and no significant change in fabric color (CIEΔE=0.4); for Tencel fabrics dyed with reactive dye reactive scarlet KE-3B, the color fastness to soap washing is level 3 after traditional soap washing, and the color fastness to soap washing reaches level 4 when washed with micro-nano bubbles, and there is no significant decrease in fabric strength and no significant change in fabric color when washed with micro-nano bubbles and comparing with traditional soap washing (CIEΔE=0.8); for Tencel fabrics dyed with reactive dye reactive turquoise blue KN-G, the color fastness to soap washing is level 2 after traditional soap washing, and the color fastness to soap washing reaches level 2-3 when washed with micro-nano bubbles, and there is no significant decrease in fabric strength and no significant change in fabric color when washed with micro-nano bubbles and comparing with traditional soap washing (CIEΔE=0.7).

[0102] Comparative Example 3

[0103] A method for washing fabric after dyeing based on micro-nano bubble technology is basically the same as Example 5, except that: the gas flow rate is 12 mL / min, the pressure is 1.0 MPa; and the diameter of the argon micro-nano bubbles is 200 nm~100 μm.

[0104] The test shows that the color fastness of Tencel fabric dyed with reactive red KE-3B after traditional soap washing is level 3, and the color fastness of Tencel fabric dyed with micro-nano bubbles after washing is level 3-4. Compared with Example 5, the color fastness of Comparative Example 3 is significantly reduced. This is because the minimum diameter of the micro-nano bubbles is much larger than the minimum diameter of the Tencel fabric after swelling, which is 50 nm. The micro-nano bubbles cannot penetrate into the small pores of the Tencel fabric for cleaning, so floating color still remains in the small pores, resulting in reduced color fastness.

[0105] Example 6

[0106] A method for washing fabric after dyeing based on micro-nano bubble technology, the specific process is as follows:

[0107] (1) Using a micro-nano bubble generator, continuously inject water containing air micro-nano bubbles at 10°C into a washing tank containing dyed wool fabric until the fabric is completely submerged in the water;

[0108] The diameter of the air micro-nano bubbles is 70nm~100μm, the water generation rate containing air micro-nano bubbles is 300 L / min, and the dynamic equilibrium concentration of air micro-nano bubbles in the water washing tank is 100 million / mL; the working flow rate of the micro-nano bubble generation device is 300 L / min, the gas flow rate is 2 L / min, and the pressure is 0.8 MPa;

[0109] (2) The water in the washing tank is continuously sucked by the micro-nano bubble generator to generate air micro-nano bubbles and then re-introduced into the washing tank to wash the dyed wool fabric for 5 minutes;

[0110] Among them, the smaller pore size inside the wool fabric after swelling in water is concentrated in the range of 80~120nm.

[0111] For the wool fabric dyed with acid red 3R, the color fastness to soap washing is level 4-5 after traditional soap washing, and the color fastness to soap washing with micro-nano bubbles reaches level 5. There is no significant decrease in fabric strength and no significant change in fabric color when washing with micro-nano bubbles compared with traditional soap washing (CIEΔE=0.6); for the wool fabric dyed with acid blue B, the color fastness to soap washing is level 4-5 after traditional soap washing, and the color fastness to soap washing with micro-nano bubbles reaches level 5. There is no significant decrease in fabric strength and no significant change in fabric color when washing with micro-nano bubbles compared with traditional soap washing (CIEΔE=0.7).

[0112] Comparative Example 4

[0113] A method for washing fabric after dyeing based on micro-nano bubble technology is basically the same as Example 6, except that: washing the dyed fabric for 1 min;

[0114] For wool fabric dyed with acid red 3R, the color fastness to soap washing is level 4 after traditional soap washing, and the color fastness to soap washing reaches level 4-5 when washed with micro-nano bubbles. Compared with traditional soap washing, the strength of the fabric does not decrease significantly, and the color of the fabric does not change significantly (CIEΔE=0.6). Compared with Example 6, the color fastness of Comparative Example 4 is significantly reduced. This is because under low temperature, the micro-nano bubble washing time is short, and the unfixed dyes in the pores of the wool fabric cannot be fully cleaned, so the color fastness is reduced.

[0115] Example 7

[0116] A method for washing fabric after dyeing based on micro-nano bubble technology, the specific process is as follows:

[0117] (1) Using a micro-nano bubble generator, continuously injecting water containing oxygen micro-nano bubbles at 40° C. into a washing tank containing dyed silk fabrics until the fabrics are completely submerged in the water;

[0118] The diameter of oxygen micro-nano bubbles is 60nm~100μm, the water generation rate of oxygen micro-nano bubbles is 500 L / min, and the dynamic equilibrium concentration of oxygen micro-nano bubbles in the water washing tank is 150 million / mL; the working flow rate of the micro-nano bubble generating device is 500 L / min, the gas flow rate is 4 L / min, and the pressure is 1.8 MPa;

[0119] (2) The water in the washing tank is continuously sucked by the micro-nano bubble generating device to generate oxygen micro-nano bubbles and then re-introduced into the washing tank, and the dyed silk fabric is then washed for 5 minutes;

[0120] Among them, the smallest pore size inside the silk fabric after swelling in water is concentrated in 70~100nm.

[0121] For silk fabrics dyed with the reactive dye Annosu yellow-brown LF, the color fastness to soap washing after traditional soap washing is level 4, and the color fastness to soap washing with micro-nano bubbles reaches level 4-5. There is no significant decrease in fabric strength and no significant change in fabric color after washing with micro-nano bubbles compared with traditional soap washing (CIEΔE=0.8); for silk fabrics dyed with the cationic dye cationic fluorescent red XR, the color fastness to soap washing after traditional soap washing is level 3, and the color fastness to soap washing with micro-nano bubbles reaches level 3-4. There is no significant decrease in fabric strength and no significant change in fabric color after washing with micro-nano bubbles compared with traditional soap washing (CIEΔE=0.8).

Claims

1. A method for washing fabric after dyeing based on micro-nano bubble technology, characterized in that: Using a micro-nano bubble generating device, water containing micro-nano bubbles at a certain temperature is continuously injected into a washing tank or dyeing vat where the dyed fabric is placed until the fabric is completely immersed in the water, and the micro-nano bubbles are continuously generated to wash the dyed fabric for a certain period of time; The fabric is a fabric containing any fiber component of cellulose fiber, wool and silk; The micro-nano bubbles are air bubbles, oxygen bubbles, hydrogen bubbles, nitrogen bubbles, helium bubbles or argon bubbles; The minimum diameter of the micro-nano bubbles is less than or equal to the diameter of the micropores in the fibers after the fabric is swollen; A certain temperature is greater than or equal to 10°C and less than 30°C, and a certain time is 5 to 10 minutes; Alternatively, the certain temperature is greater than or equal to 30°C and less than 60°C, and the certain time is 2 to 5 minutes; Alternatively, the certain temperature is greater than or equal to 60°C and less than or equal to 80°C, and the certain time is 30s to 5min; The water containing micro-nano bubbles is produced at a rate of 1000mL / min~1000L / min; For air bubbles, oxygen bubbles, and hydrogen bubbles, the dynamic equilibrium concentration of micro-nano bubbles in water is 50-150 million / mL; For nitrogen bubbles, helium bubbles and argon bubbles, the dynamic equilibrium concentration of micro-nano bubbles in water is 150 to 300 million per mL.

2. The method for washing fabric after dyeing based on micro-nano bubble technology according to claim 1, characterized in that: The diameter of micro-nano bubbles is 30nm~100μm.

3. The method for washing fabric after dyeing based on micro-nano bubble technology according to claim 1, characterized in that: Continuously generating micro-nano bubbles in a washing tank or a dyeing jar by using a micro-nano bubble generating device means continuously absorbing water in the washing tank by the micro-nano bubble generating device to generate micro-nano bubbles and then re-introducing the micro-nano bubbles into the washing tank or the dyeing jar.

4. The method for washing fabric after dyeing based on micro-nano bubble technology according to claim 1, characterized in that: The working flow rate of the micro-nano bubble generating device is 1000mL / min~1000L / min, the gas flow rate is 6mL / min~20L / min, and the pressure is 0.4~2MPa.

5. The method for washing fabric after dyeing based on micro-nano bubble technology according to claim 1, characterized in that: The dyed fabric refers to the fabric dyed with reactive dyes, direct dyes, acid dyes, cationic dyes, vat dyes or sulphur dyes, and the dyeing process is an immersion dyeing process or a pad dyeing process.