A high temperature acid dyeing method for ammonia-free stretch fabric

Abstract

The application belongs to the technical field of textile printing and dyeing, and discloses a high-temperature acid-adjusting dyeing method for ammonia-free elastic fabric, which contains PET / PBT parallel composite fibers or PET / PTT parallel composite fibers, and includes the operation of adding an auxiliary solution, a dyeing solution and an acid solution into a dyeing machine, and the whole process flow includes a heat preservation stage h, a temperature rising stage i, a heat preservation stage j, a temperature rising stage k and a heat preservation stage l, the temperature of the heat preservation stage h is 100-110 DEG C, the temperature of the heat preservation stage l is 130-135 DEG C, the temperature of the heat preservation stage j is 115-120 DEG C, the operation of adding the acid solution into the dyeing machine is carried out in the temperature rising stage k, the temperature rising rate of the temperature rising stage k is 0.5-1.0 DEG C / min, and when the acid solution is added into the dyeing machine, the feeding time is 25-40 min. The application avoids the uneven dyeing caused by the difference in permeability and diffusivity of the fabric, improves the dyeing efficiency and ensures the uniformity of dyeing.

Description

Technical Field

[0001] This invention belongs to the field of textile printing and dyeing technology, and specifically relates to a high-temperature acid-conditioning dyeing method for ammonia-free elastic fabrics. Background Technology

[0002] In recent years, with the upgrading of domestic consumption and the advancement of technology, the market demand for elastic fabrics has gradually increased. However, during the production and use process, traditional elastic fiber spandex has revealed some problems, such as excessively high dyeing and finishing temperatures, which can easily cause loss of fabric elasticity; and issues such as imperfect yarn coverage, exposed spandex fibers, and undyed spandex fibers showing white spots on the fabric, resulting in shiny spots.

[0003] PTT and PBT, as emerging fiber materials, have excellent application prospects in replacing and expanding the functions of spandex fibers. However, they are expensive and are usually blended with synthetic fibers such as PET, cotton, and wool, which reduces costs and optimizes fabric performance. Ammonia-free elastic fabrics containing PET / PBT or PET / PTT parallel composite fibers have superior resilience and excellent dyeing properties, and a soft hand feel, making them ideal raw materials for wool-like and down-like fabrics for comfortable wear. In recent years, ammonia-free elastic fabrics have received widespread attention in the textile industry, and their production has grown rapidly. However, ammonia-free elastic fabrics are prone to problems such as color difference, uneven coloring, and wrinkles during dyeing.

[0004] In practical production applications, the shrinkage rate of PET / PBT composite fibers is affected by dye formulations and dyeing process parameters (such as temperature and pH), and because the shrinkage rate of PET / PBT composite fibers increases with increasing temperature. This is because as the temperature rises, the molecular chain movement in the composite fiber intensifies, more molecular chains evolve from an ordered to a disordered state, disorientation increases, fiber deformation increases, and the shrinkage rate also increases accordingly. At the same temperature, the shrinkage rate of PET / PTT and PET / PBT composite fibers is significantly higher than that of pure PET fibers. This is mainly because PBT and PTT have lower glass transition temperatures. At the same temperature, water molecules can better penetrate into the fiber interior, causing it to swell and resulting in more macromolecular chains dissociating, thus increasing the system's shrinkage rate. Furthermore, for PBT and PTT fibers, due to their lower glass transition temperatures, the dye's ability to penetrate the fiber interior is also higher. As the degree of shrinkage increases, although the dye can penetrate the fiber interior, it is difficult to guarantee uniformity (i.e., the state of the dye entering the fiber at two adjacent moments will be different). Especially for bicomponent composite fibers, due to the differences in glass transition temperature and shrinkage rate between the two fibers, as the temperature rises, the fibers form a three-dimensional spiral curl under internal stress. The degree to which the dye causes the internal voids of the fibers to open varies. If the dyeing rate is not well controlled, the degree to which the dye penetrates the fiber interior will differ. Therefore, it is difficult to control color difference and fabric surface during the dyeing process of such fabrics, greatly affecting the product's quality stability.

[0005] With the rapid development of textile production technology, the quality requirements for textile products are becoming increasingly stringent. In particular, improving color fastness, color vibrancy, and controlling fabric color difference are the main research directions in the field of textile printing and dyeing technology. In the entire dyeing process, injection control is one of the key points of the entire process and plays an important role in the quality of textiles. At present, the injection process control in printing and dyeing production mostly relies on manual labor or simple valve opening adjustment. Due to the influence of the on-site environment such as temperature and pressure, the valve opening is actually in a very unstable state during the entire injection process. This results in the valve opening being either too high or too low in the actual production process, causing the injection rate of dyes, chemicals, and auxiliaries to be too fast or too slow from time to time, which seriously affects the dyeing quality and production efficiency.

[0006] The patent application with publication number CN104278574A discloses a dyeing process for PTT fabrics using microcapsule disperse dyes. This process achieves good dyeing results by using microcapsule disperse dyes to dye PTT fabrics. However, this method requires the use of specially made microcapsule disperse dyes, which results in high costs.

[0007] The patent with authorization publication number CN102080335B discloses a dyeing and finishing method for polypropylene terephthalate (PTT) fabrics. Although it reduces the problems of color spots and chicken claw marks in the dyeing process, it requires the addition of softeners to the dye bath and may not be suitable for PTT blended fabrics.

[0008] Patent CN111996814B discloses a dyeing process for a novel ultra-high elastic fabric based on PBT composite yarn (the process is as follows). Figure 1 As shown in the figure, although this process has achieved good dyeing results, this method is only suitable for dark colors with a high dye dot count (>3.5%). For some sensitive colors and light colors, it cannot guarantee dyeing uniformity and prevent the formation of chicken claw marks and color creases.

[0009] While the above methods improve the dyeing efficiency and uniformity of products under certain specific conditions, they are affected by the dye formulation and auxiliaries, and the acid addition temperature is generally not higher than 60℃. Since the dyeing pH has a significant impact on the dyeing rate, especially for some sensitive and bright color formulations, problems such as color spots and large color differences are particularly prone to occur during dyeing.

[0010] Patent CN117802799B discloses a dyeing method and apparatus for adjusting the pH value of the dye liquor after dyeing. This method involves adjusting the acidity at 80-120℃, resulting in small color difference and a high success rate. However, it is not suitable for dyeing ammonia-free elastic fabrics and cannot solve problems such as color spots, color differences, edge wrinkles, chicken claw marks, and color crease marks that easily occur during the dyeing process of ammonia-free elastic fabrics. Therefore, in order to better solve the above problems, this invention studies the dyeing temperature range of various macromolecular disperse dyes in order to provide a dyeing process method containing disperse bright dye formulations.

[0011] To address the aforementioned issues with dye injection control, patent CN221545022U discloses a high-quality textile printing and dyeing equipment. This equipment, through the design of a quantitative tank and injection pump, ensures the accuracy of dye injection, replacing the method of directly adding dye into the main cylinder. It also facilitates quantity control and features a structure that heats the dye solution to a high temperature via steam heat exchange. Furthermore, the main cylinder is in a compressed air state, which helps enhance the dye's fixation strength on the textile surface and improves printing and dyeing quality. However, this quantitative injection method only ensures the stability of the total liquid volume; controlling the injection rate during the process is difficult.

[0012] In addition, it is crucial to properly control the rate of acid addition during the dyeing process. Adding acid too quickly or too slowly will affect the dyeing rate. None of the above solutions mentioned the control of the acid addition rate when adjusting the pH. This is especially important when dyeing ammonia-free elastic fabrics, as the fabric tends to shrink as the temperature rises. Therefore, it is even more necessary to properly adjust the acid addition rate and temperature to control the dyeing rate within a reasonable range, achieve uniform dyeing, and reduce color differences, edge wrinkles, claw marks, and color creases on the fabric surface after dyeing.

[0013] Therefore, a high-temperature acid-conditioning dyeing method for ammonia-free elastic fabrics is needed to solve the above problems, which is of great significance. Summary of the Invention

[0014] The purpose of this invention is to solve the problems existing in the prior art and provide a high-temperature acid-adjusting dyeing method for ammonia-free elastic fabrics, which solves the problems of color spots, color differences, edge wrinkles, chicken claw marks, and color crease marks that are prone to occur during the dyeing process.

[0015] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0016] A high-temperature acid-conditioning dyeing method for ammonia-free elastic fabric, wherein the ammonia-free elastic fabric contains PET / PBT parallel composite fibers or PET / PTT parallel composite fibers, includes the operation of adding auxiliary solution, dye liquor and acid solution to the dyeing machine. The entire process includes a heat preservation stage h and a heat preservation stage l. The temperature of heat preservation stage h is 100-110℃ and the temperature of heat preservation stage l is 130-135℃. The entire process also includes a heating stage i, a heat preservation stage j and a heating stage k.

[0017] The heat preservation stage h, the heating stage i, the heat preservation stage j, the heating stage k, and the heat preservation stage l are sequentially adjacent;

[0018] The temperature during the heat preservation stage is 115-120℃;

[0019] The addition of acidic solution to the dyeing machine begins at the heating stage k, with a heating rate of 0.5-1.0℃ / min. The addition time for the acidic solution to the dyeing machine is 25-40 min.

[0020] Disperse dyes and polyester fiber molecules are mainly attracted by van der Waals forces. The prerequisite for dyeing is the micro-gaps between polyester fiber molecules. When the volume of the cavities is equal to or exceeds the size of the dye molecules, the dye can diffuse into the fiber. Therefore, the larger the volume and the more numerous the cavities, the greater the probability of the fiber molecules combining with the dye, and the higher the dyeing rate.

[0021] Compared to existing technologies, this invention adds a 115-120℃ holding stage between the 100-110℃ and 130-135℃ holding stages, and postpones the operation of adjusting the pH of the dye bath with an acidic solution. Related studies show that PBT fibers achieve the highest dye uptake at 100℃, and PTT fibers at 110℃. Therefore, during the 100-110℃ holding stage, the dye fully permeates the PBT or PTT components in the fiber. Since no acidic solution is added at this stage, the dyeing rate of PET is much lower than that of the PBT or PTT components. The dye primarily permeates the PBT or PTT components during this process, and the PBT or PTT components in the fiber have already reached their maximum shrinkage rate. The 115-120℃ holding stage allows the fiber to shrink further, at which point most of the dye has uniformly entered the fiber cavities. Adding an acidic solution to adjust the pH of the dye bath further accelerates the diffusion of the dye into the fiber, which is beneficial for achieving uniform dyeing throughout the process. If an acidic solution is added too early to adjust the pH of the dye bath, the entire system will simultaneously experience fiber shrinkage, dye entry into fiber cavities, and dye diffusion into the fiber interior, making it difficult to ensure uniform dyeing throughout the process. If an acidic solution is added too late to adjust the pH of the dye bath, the dye's weak binding ability to the fiber will cause it to desorb from the fiber interior, resulting in poorer dyeing effects and significantly reduced color stability.

[0022] As a preferred technical solution:

[0023] As described above, the high-temperature acid-adjusting dyeing method for ammonia-free elastic fabric involves adding auxiliary solutions, dye liquor, and acidic solutions to the dyeing machine at a uniform feeding rate by adjusting the valve opening in real time. The valve is installed between a cylindrical material tank and the dyeing machine. The cylindrical material tank is used to hold the auxiliary solutions, dye liquor, or acidic solutions. When adding auxiliary solutions to the dyeing machine, the valve opening range is 38-60%, and the feeding time is 2-5 minutes. When adding dye liquor to the dyeing machine, the valve opening range is 0.5-1.5%, and the feeding time is 60-75 minutes. When adding acidic solutions to the dyeing machine, the valve opening range is 2.8-10%.

[0024] Under ideal conditions, the valve opening can be controlled to a constant value when adding auxiliary solutions, dye liquor and acidic solutions to the dyeing machine. However, in practical applications, the valve opening is affected by a variety of factors, including interference from on-site conditions, equipment vibration and temperature and pressure conditions. If the valve opening fluctuates greatly, it will lead to serious dyeing problems, such as increased color difference. Therefore, this invention proposes a solution to adjust the valve opening in real time.

[0025] The high-temperature acid-adjusting dyeing method for ammonia-free elastic fabric described above uses an electrically adjustable proportional valve, with the valve opening varying with the current I*. The steps for adding the auxiliary agent solution, dye liquor, and acidic solution to the dyeing machine are as follows:

[0026] (a) A liquid level sensor is installed inside a cylindrical container (70 cm in diameter and 60 cm in height). An auxiliary agent solution, dye solution, or acidic solution is added to the cylindrical container. When the liquid level in the cylindrical container reaches its minimum value (0), the output current of the liquid level sensor is I. min When the liquid level in the cylindrical container reaches its maximum value, the output current of the liquid level sensor is I. max ;

[0027] (b) A current I* is applied to the valve so that the valve opening u(k) reaches the minimum value. If the valve range is 4-20mA, then the current I* is 4mA.

[0028] (c) Let k=1;

[0029] (d) During the k-th cycle, the output current I of the liquid level sensor is acquired in real time, and the liquid level percentage P of the cylindrical tank is calculated in real time, P=(II) min ) / (I max -I min )×100%, and then calculate the rate of change of the liquid level percentage P in the cylindrical tank with time t, and use it as the actual feeding rate V(k);

[0030] The duration of each cycle is 20ms;

[0031] (e) Calculate the valve opening adjustment value Δu(k);

[0032] when hour, ;

[0033] when , ;

[0034] when hour, ;

[0035] In the formula, the unit of Δu(k) is % %.

[0036] Ve(k) = V*(k) - V(k), where V*(k) represents the target feeding rate. The target feeding rate V*(k) for the auxiliary agent solution is 0.06-0.25% / s, the target feeding rate V*(k) for the dye solution is 0.011-0.020% / s, and the target feeding rate V*(k) for the acidic solution is 0.015-0.045% / s.

[0037] ε1 is 0.05% / s;

[0038] ε2 is 0.2% / s;

[0039] It is 65;

[0040] It is 0.0186;

[0041] =0;

[0042] =900×C+20, where C is the value of Ve(k) in % / s;

[0043] It is 2 / 125;

[0044] =0;

[0045] It is 200;

[0046] It is 0.016;

[0047] =0;

[0048] r is a coefficient with a value of 1, used to ensure that the physical units on both sides of the formula are consistent;

[0049] When k=1, let =0; when k≤2, let =0;

[0050] (f) Adjust the current I* supplied to the valve so that the valve opening u(k) increases by Δu(k);

[0051] (g) Determine whether the feeding time has reached the set value. If so, adjust the current I* supplied to the valve so that the valve opening u(k) reaches the minimum value; otherwise, let k=k+1 and return to step (d).

[0052] The high-temperature acid-conditioning dyeing method for ammonia-free elastic fabric described above also includes sequentially adjacent heating stages a, heat preservation stage b, heating stage c, heat preservation stage d, heating stage e, heat preservation stage f, and heating stage g.

[0053] The heating stage g is adjacent to the heat preservation stage h;

[0054] The temperature of heat preservation stage b is 45-50℃, the temperature of heat preservation stage d is 55-65℃, and the temperature of heat preservation stage f is 80-90℃.

[0055] Existing technologies have two insulation stages between the 45-50℃ insulation stage and the 100-110℃ insulation stage, corresponding to the 75℃ insulation stage and the 100℃ insulation stage, respectively. This invention changes the 75℃ insulation stage to a 55-65℃ insulation stage, and the 100℃ insulation stage to 80-90℃, for the following reasons:

[0056] At 55-65℃, the PET component has not reached the glass transition temperature. Holding at this temperature can allow the dye to dye the PBT or PTT component as much as possible, reducing subsequent competition with the PET component for dyeing.

[0057] At 80-90℃, the shrinkage and dyeing synchronization of PBT or PTT components are better. Keeping the temperature at this level is beneficial for the uniform dyeing of PBT or PTT components.

[0058] Meanwhile, at 80-90℃, the PET component has just reached its glass transition temperature, and the dye is still mainly dyeing the PBT or PTT component. Holding the dye at this temperature can allow the dye to dye the PBT or PTT component as much as possible, reducing the subsequent competition between the dye and the PET component.

[0059] As described above, the high-temperature acid-conditioning dyeing method for ammonia-free elastic fabric has the following holding times: holding stage b, holding stage d, holding stage f, holding stage h, holding stage j, and holding stage l are 2-5 min, 5-10 min, 2-5 min, 10-15 min, 2-5 min, and 40-60 min, respectively; and heating rates for heating stages a, c, e, g, and i are 2-4℃ / min, 0.8-1.2℃ / min, 3-5℃ / min, 0.5-0.8℃ / min, and 0.5-0.8℃ / min, respectively. The heating rate in heating stage g is relatively low because PET reaches its glass transition temperature during the 80-90℃ holding stage, at which point PBT or PTT may compete with PET for dyeing. Reducing the heating rate can decrease the aggregation of dye molecules on the fiber surface and reduce the diffusion rate. When the temperature rises slowly, the kinetic energy of the dye molecules increases uniformly, allowing the dye molecules to enter the fiber interior in an orderly manner, preventing the dye concentration on the outer layer of the fiber from being too high. In addition, the slow heating may cause the fiber structure to swell and shrink uniformly, and the internal pore structure of the fiber to change slowly, allowing the dye to be adsorbed uniformly.

[0060] As described above, in a high-temperature acid-adjusting dyeing method for ammonia-free elastic fabric, the ammonia-free elastic fabric is added to the dyeing machine along with water before the heating stage a. The amount of ammonia-free elastic fabric added is 235-360 kg, and the amount of water added is 1500-2100 L.

[0061] In the high-temperature acid-conditioning dyeing method for ammonia-free elastic fabric described above, the operation of adding dye liquor into the dyeing machine begins at the end of the heating stage a.

[0062] Existing technologies generally add the dye solution at room temperature. This invention adjusts the timing of dye solution addition, which can improve dyeing uniformity for the following reasons:

[0063] Once the fiber reaches its glass transition temperature, if the dye bath has been fully added, the dye concentration in the entire dye bath will be very high. At this point, the dye will begin to diffuse rapidly into the fiber. The main reason for color spots and color differences in the fabric is the uneven dyeing of the fiber. Therefore, PET / PBT and PET / PTT fibers are prone to uneven dyeing distribution. Even if the heating rate is reduced, it is impossible to completely avoid color creases, color spots, and other problems. Therefore, the present invention controls the addition of dye liquor to the dyeing machine to begin at the end of heating stage a and end at the end of heating stage g. On the one hand, this reduces the concentration of dye in the dye bath, greatly improving the uniformity of diffusion. On the other hand, since the fiber contains PET components, both components reach the glass transition temperature after reaching 80°C. At this time, the dye can diffuse into the interior of both components, and the process is similar to the competitive dyeing phenomenon. If the dye concentration is too high at this time, the dye will be on the surface of the fiber over a large area. When the pores inside the fiber open, a large amount of dye will enter, and it will be impossible to ensure uniform dyeing. However, the uniform feeding method will not have such a situation. The dye will not enter the interior of the fiber in a large area randomly, but will enter slowly and gradually. As the temperature rises, this uniform dyeing process can still be guaranteed, and the holding time of each temperature stage can be reduced.

[0064] In the high-temperature acid-adjusting dyeing method for ammonia-free elastic fabric described above, the addition of the auxiliary agent solution to the dyeing machine is carried out during the heating stage a.

[0065] Existing technologies typically involve adding the auxiliary agent solution to the dyeing machine at room temperature. In this invention, the auxiliary agent solution is added to the dyeing machine during the heating stage (a). This improves the uniformity of the auxiliary agent solution on the fiber surface, resulting in a better retarding effect. If the auxiliary agent solution is added to the dyeing machine at room temperature, there may be uneven adsorption of the auxiliary agent solution, causing different areas of the fiber surface to have different retarding properties, thus affecting the dyeing uniformity.

[0066] The high-temperature acid-adjusting dyeing method for ammonia-free elastic fabric described above uses an auxiliary agent solution composed of a dispersant, a leveling agent, and water. The dispersant is at least one of the following: AD-G, chelating dispersant TF-133F(SH), chelating dispersant TF-133CS, and water quality balancing agent M-1075P. The leveling agent is at least one of the following: TF-212K, high-temperature leveling agent MDL, high-efficiency repair agent TF-216BA, and dispersing leveling agent M-2433K. The amount of auxiliary agent solution added is 40-50L, the temperature of the auxiliary agent solution is 25-35℃, and at the end of adding the auxiliary agent solution to the dyeing machine, the concentration of the dispersant or leveling agent in the dyeing machine is 0.6-0.8g / L.

[0067] The high-temperature acid-adjusting dyeing method for ammonia-free elastic fabric described above involves the following steps for preparing the dye solution: 5-10L of water is added to the weighed dye to prepare the sizing, followed by 30-50L of water. The mixture is then stirred for 5-15 minutes using a high-speed mixer to obtain dye solution 1. Dye solution 1 is added to a cylindrical container and diluted with water to 120-160L to obtain dye solution 2, which is then continuously mixed and stirred for later use. The amount of dye solution added is 120-160L, and the temperature of the dye solution is 30-35℃. At the end of adding the dye solution to the dyeing machine, the mass of the dye in the dyeing machine is 0.03-3.5% of the mass of the ammonia-free elastic fabric.

[0068] The high-temperature acid-conditioning dyeing method for ammonia-free elastic fabric described above uses an aqueous solution of an acidic substance, which is ammonium sulfate or glacial acetic acid. The amount of acidic solution added is 100-150L, ​​and the temperature of the acidic solution is 25-35℃. At the end of adding the acidic solution to the dyeing machine, the concentration of the acidic substance in the dyeing machine is 0.4-1.2g / L.

[0069] The high-temperature acid-adjusting dyeing method for ammonia-free elastic fabric described above uses a high-temperature, high-pressure overflow dyeing machine. The process parameters of the high-temperature, high-pressure overflow dyeing machine are: main pump frequency 32-35HZ, main pump pressure 0.2-0.24MPa, and fabric speed (the speed at which the fabric moves in the dyeing machine, converted from meter length / turn) 380-530m / min.

[0070] After the heat preservation stage 1 is completed, the temperature is reduced to 70°C at a cooling rate of 1.0-1.5°C / min, then the liquid is drained and the liquid is rinsed with overflow water.

[0071] The high-temperature acid-conditioning dyeing method for ammonia-free elastic fabric described above involves warp and weft yarns of the ammonia-free elastic fabric composed of PET / PBT parallel composite fibers or PET / PTT parallel composite fibers, or warp yarns composed of PET / PBT parallel composite fibers or PET / PTT parallel composite fibers and weft yarns composed of PET fibers, or warp yarns composed of PET fibers and weft yarns composed of PET / PBT parallel composite fibers or PET / PTT parallel composite fibers.

[0072] The high-temperature acid-adjusting dyeing method for ammonia-free elastic fabric described above results in a color difference value of <0.3 for the dyed ammonia-free elastic fabric, a color fastness to soap washing of grade 4 or above, a color fastness to rubbing of grade 4 or above, and a color fastness to perspiration of grade 4 or above.

[0073] Beneficial effects:

[0074] (1) The high-temperature acid-adjusting dyeing method for ammonia-free elastic fabrics of the present invention changes the traditional dyeing process. By adjusting the acid at a high temperature and speed (above 115°C), the dyeing rate of the entire dyeing stage is reasonably controlled. This reduces the problem of rapid shrinkage of ammonia-free elastic fabrics in conventional processes and uneven dyeing caused by excessively low pH during the rapid dyeing stage. The dyeing rate is controlled within a reasonable range, ensuring the uniformity of dyeing and solving the problems of easy color bleeding, wrinkles, and large color difference in dyeing ammonia-free elastic fabrics.

[0075] (2) According to different injection rates, the present invention controls the PID parameters in stages and optimizes the relationship between the current output value and the valve opening, thereby controlling the valve opening at different injection rates to achieve the best, so that the injection rate of the whole process is uniform and stable, solving the problems of large injection quantity deviation and unstable injection rate in the traditional injection control process, greatly improving the injection control accuracy of dye liquor and auxiliary agent in the dyeing process, helping to improve the uniformity of the interaction between dye liquor, auxiliary agent and dyed fabric, and reducing the color difference of the fabric surface after dyeing. Attached Figure Description

[0076] Figure 1 This is a schematic diagram of a conventional dyeing method for ammonia-free elastic fabrics in the prior art;

[0077] Figure 2 This is a schematic diagram of the high-temperature acid-adjusting dyeing method for ammonia-free elastic fabrics according to the present invention. Detailed Implementation

[0078] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0079] To ensure that the performance of the substances used in each embodiment is fully disclosed, the manufacturers and brands of the substances are specified. Other products from other manufacturers and brands that conform to the limitations of this invention are also feasible.

[0080] The following are the sources of the materials used in each embodiment:

[0081] ALBATEX® AD-G: Manufacturer is Huntsman Textiles & Chemicals (China) Co., Ltd., brand name is ALBATEX® AD-G;

[0082] Chelating dispersant TF-133F(SH): Manufacturer is Zhejiang Chuanhua Chemical Co., Ltd., brand name is TF-133F(SH);

[0083] Chelating dispersant TF-133CS: Manufacturer: Zhejiang Chuanhua Chemical Co., Ltd., Brand: TF-133CS;

[0084] Water quality balancer M-1075P: Manufacturer is Hangzhou Meigao Huayi Chemical Co., Ltd., brand name is M-1075P;

[0085] Leveling agent TF-212K: Manufacturer is Zhejiang Chuanhua Chemical Co., Ltd., brand name is LTF-212K;

[0086] High-temperature leveling agent MDL: Manufacturer is Tuona Co., Ltd., brand name is LEVEGAL MDL 02;

[0087] High-efficiency repair agent TF-216BA: Manufacturer is Zhejiang Chuanhua Chemical Co., Ltd., brand name is TF-216BA;

[0088] Dispersing and leveling agent M-2433K: Manufacturer is Hangzhou Meigao Huayi Chemical Co., Ltd., brand name is M-2433K;

[0089] Functional refining agent HS-113L: Manufacturer is Jiaxing Huasheng Additives Industry Co., Ltd., brand name is multi-component refining agent HS-113L;

[0090] Dispersant JN-180N: Manufacturer is Jiaxing Huasheng Additives Industry Co., Ltd., brand name is chelating dispersant JN-180N;

[0091] The testing methods for the relevant performance indicators in the following embodiments are as follows:

[0092] Fabric color difference value: The ammonia-free elastic fabrics prepared in each embodiment were used as samples, and the Lab values ​​of the samples were analyzed using a spectrophotometer (DATA-COLOR 800). The Lab value analysis involved collecting samples at four sampling points on the sample, measuring the Lab values, and calculating the average value. The specific steps are as follows:

[0093] 1. Start the instrument: Turn on the computer and the colorimeter, and preheat for 20-30 minutes;

[0094] 2. Start the operating system;

[0095] 3. Perform instrument calibration (select a test aperture of 30mm);

[0096] 4. Determination of samples during non-whiteness testing;

[0097] a. Establish a standard sample, using the central area of ​​the test sample as the standard sample, with a test sample size of 80cm*80cm;

[0098] b. Establish batch samples, take 2 points in each of the warp and weft directions of the test sample as the batch sample for measurement, and take the average of the test values ​​of the four points as the color difference value of the fabric surface.

[0099] Color fastness to washing: The ammonia-free elastic fabrics prepared in each example were used as samples, and the color fastness of the samples was tested according to GB / T3921-2008 "Textiles - Tests for color fastness to washing" standard.

[0100] Color fastness to rubbing: The ammonia-free elastic fabrics prepared in each example were used as samples, and the color fastness to rubbing of the samples was tested according to GB / T3920—2008 "Textiles - Tests for color fastness to rubbing" standard.

[0101] Color fastness to perspiration: The ammonia-free elastic fabrics prepared in each example were used as samples, and the color fastness to perspiration of the samples was tested according to GB / T3922-2013 "Textiles - Tests for color fastness to fabrics - Color fastness to perspiration".

[0102] Example A1

[0103] A method for adding auxiliary agent solution, dye liquor, and acidic solution to a dyeing machine, comprising the following steps:

[0104] (a) A liquid level sensor is installed inside a cylindrical container (70 cm in diameter and 60 cm in height). An auxiliary agent solution, dye solution, or acidic solution is added to the cylindrical container. When the liquid level in the cylindrical container reaches its minimum value (0), the output current of the liquid level sensor is I. min When the liquid level in the cylindrical container reaches its maximum value, the output current of the liquid level sensor is I. max ;

[0105] (b) Current I* is supplied to the valve (electrically adjustable proportional valve with a range of 4-20mA) installed between the cylindrical material tank and the dyeing machine so that the valve opening u(k) reaches the minimum value;

[0106] (c) Let k=1;

[0107] (d) During the k-th cycle, the output current I of the liquid level sensor is acquired in real time, and the liquid level percentage P of the cylindrical tank is calculated in real time, P=(II) min ) / ( I max -I min )×100%, and then calculate the rate of change of the liquid level percentage P in the cylindrical tank with time t, and use it as the actual feeding rate V(k);

[0108] The duration of each cycle is 20ms;

[0109] (e) Calculate the valve opening adjustment value Δu(k);

[0110] when hour, ;

[0111] when , ;

[0112] when hour, ;

[0113] In the formula, the unit of Δu(k) is % %.

[0114] Ve(k) = V*(k) - V(k), where V*(k) represents the target feeding rate. The target feeding rate V*(k) for the auxiliary agent solution is 0.06-0.25% / s, the target feeding rate V*(k) for the dye solution is 0.011-0.020% / s, and the target feeding rate V*(k) for the acidic solution is 0.015-0.045% / s.

[0115] ε1 is 0.05% / s;

[0116] ε2 is 0.2% / s;

[0117] It is 65;

[0118] It is 0.0186;

[0119] =0;

[0120] =900×C+20, where C is the value of Ve(k) in % / s;

[0121] It is 2 / 125;

[0122] =0;

[0123] It is 200;

[0124] It is 0.016;

[0125] =0;

[0126] r is a coefficient with a value of 1, used to ensure that the physical units on both sides of the formula are consistent;

[0127] When k=1, let =0; when k≤2, let =0;

[0128] (f) Adjust the current I* supplied to the valve so that the valve opening u(k) increases by Δu(k);

[0129] (g) Determine whether the feeding time has reached the set value. If so, adjust the current I* supplied to the valve so that the valve opening u(k) reaches the minimum value; otherwise, let k=k+1 and return to step (d).

[0130] Example B1

[0131] A high-temperature acid-conditioning dyeing method for ammonia-free elastic fabrics, comprising the following steps:

[0132] (1) Preparation of raw materials;

[0133] Ammonia-free elastic fabric: The manufacturer of ammonia-free elastic fabric is Kunshan Dongli New Material Technology Co., Ltd., the product name is T800, the weight is 210g / m, the width of the raw fabric is 199cm, the warp yarn of the ammonia-free elastic fabric is composed of PET fiber, and the weft yarn is composed of PET / PBT parallel composite fiber.

[0134] The auxiliary solvent consists of Albetes AD-G, leveling agent TF-212K, and water.

[0135] Dye solution: Add 5L of water to blue E-4R, yellow AC-E and pink S-BEL to make a paste. Then add 30L of water and stir with a high-speed mixer for 5 minutes to get dye solution 1. Add dye solution 1 to a cylindrical material tank and dilute with water to 120L to get dye solution 2. Continue to mix and stir for later use.

[0136] Acidic solution: An aqueous solution of an acidic substance, such as ammonium sulfate;

[0137] Dyeing machine: High temperature and high pressure overflow dyeing machine, its process parameters are: main pump frequency 32HZ, main pump pressure 0.2MPa, cloth speed 380m / min;

[0138] OS-type desizing machine: includes an alkali tank and three washing tanks located after the alkali tank; the temperature in the alkali tank is 95℃, and the temperatures of the washing tanks into which the ammonia-free elastic fabric enters first, the second-first, and the last are 70℃, 60℃, and 50℃, respectively; the flat-width desizing solution in the alkali tank is composed of sodium hydroxide with a concentration of 10g / L, functional scouring agent HS-113L with a concentration of 4g / L, dispersant JN-180N with a concentration of 2g / L, and water;

[0139] (2) Pretreatment of ammonia-free elastic fabrics;

[0140] The ammonia-free elastic fabric is desized in an OS-type desizing machine at a flat width; the machine speed is 50m / min.

[0141] (3) The pretreated ammonia-free elastic fabric and water are added to the high-temperature and high-pressure overflow dyeing machine. Then, the heating stage a is started, and the auxiliary agent solution is added to the high-temperature and high-pressure overflow dyeing machine. After the temperature rises from 35°C to 45°C, the heating stage a ends and the heat preservation stage b begins. At the same time, the dye liquor is added to the high-temperature and high-pressure overflow dyeing machine. The heating rate of the heating stage a is 3°C / min, the temperature of the heat preservation stage b is 45°C, and the heat preservation time of the heat preservation stage b is 2min. The amount of ammonia-free elastic fabric added was 360 kg, the amount of water added was 2100 L, the amount of auxiliary agent solution added was 50 L, and the temperature of the auxiliary agent solution was 32 °C. When adding the auxiliary agent solution to the dyeing machine, the valve opening was stabilized at 60% using the control method of Example A1, and the feeding time was 2 min. At the end of adding the auxiliary agent solution to the dyeing machine, the concentration of Albetes AD-G in the dyeing machine was 0.8 g / L, and the concentration of leveling agent TF-212K was 0.6 g / L.

[0142] (4) After the end of the heat preservation stage b in step (3), the heating stage c, heat preservation stage d, heating stage e, heat preservation stage f, heating stage g, heat preservation stage h, heating stage i, and heat preservation stage j are carried out in sequence, and the addition of dye solution is stopped after the end of the heating stage g; wherein, the heating rate of heating stage c, heating stage e, heating stage g, and heating stage i is 0.8℃ / min, 4℃ / min, 0.5℃ / min, and 0.5℃ / min, respectively, and the heat preservation time of heat preservation stage d, heat preservation stage f, heat preservation stage h, and heat preservation stage j is 6min, 3min, 15min, and 2min, respectively, the temperature of heat preservation stage d is 55℃, the temperature of heat preservation stage f is 80℃, the temperature of heat preservation stage h is 100℃, and the temperature of heat preservation stage j is 115℃;

[0143] In steps (3) to (4), when adding dye liquor to the dyeing machine, the control method of Example A1 is used to stabilize the valve opening at 0.5%, the feeding time at 75 min, the amount of dye liquor added at 120 L, and the temperature of the dye liquor at 30 °C. At the end of adding dye liquor to the dyeing machine, the mass of blue E-4R in the dyeing machine is 0.027% of the mass of ammonia-free elastic fabric, the mass of yellow AC-E is 0.1% of the mass of ammonia-free elastic fabric, and the mass of pink S-BEL is 0.058% of the mass of ammonia-free elastic fabric.

[0144] (5) After the heat preservation stage j ends, the heating stage k begins. At the same time, 100L of acidic solution at 30℃ is added to the dyeing machine. After the temperature reaches the target temperature, the heat preservation stage l begins. When adding acidic solution to the dyeing machine, the valve opening is stabilized at 2.8% using the control method of Example A1. The feeding time is 35min. At the end of adding acidic solution to the dyeing machine, the concentration of acidic substance in the dyeing machine is 0.4g / L. The heating rate of heating stage k is 0.5℃ / min. The temperature of heat preservation stage l is 132℃. The heat preservation time of heat preservation stage l is 40min.

[0145] (6) After the heat preservation stage 1 in step (5) is completed, the temperature is reduced to 70°C at a cooling rate of 1.5°C / min. Then the liquid is drained and the overflow water is washed for 5 minutes to obtain the dyed ammonia-free elastic fabric.

[0146] In steps (2) to (6), the valve control method when adding auxiliary agent solution, dye liquor and acidic solution to the dyeing machine adopts the control method of Example A1, wherein the target feeding rate V*(k) of auxiliary agent solution is 0.25% / s, the target feeding rate V*(k) of dye liquor is 0.011% / s, and the target feeding rate V*(k) of acidic solution is 0.020% / s.

[0147] The final dyed ammonia-free elastic fabric has a color difference value of 0.1, a color fastness to soap washing of grade 4-5, a color fastness to rubbing of grade 4-5, a color fastness to perspiration of grade 4-5, and no wrinkles or color wrinkles on the surface of the dyed ammonia-free elastic fabric.

[0148] Comparative Example 1

[0149] A high-temperature acid-adjusting dyeing method for ammonia-free elastic fabric is basically the same as in Example B1, except that it does not contain a heat preservation stage j and a heating stage k. The heating stage i is a direct heating from 100°C to 132°C at a rate of 0.8°C / min before entering the heat preservation stage l.

[0150] The final color difference value of the dyed ammonia-free elastic fabric was 0.52, the color fastness to perspiration was grade 4, and the surface of the dyed ammonia-free elastic fabric had severe color wrinkles.

[0151] Comparing Comparative Example 1 and Example B1, it can be seen that the color difference value of the dyed ammonia-free elastic fabric obtained in this comparative example is significantly increased, and the fastness to perspiration is slightly reduced. This is because this comparative example lacks the heat preservation stage j. During the temperature rise from 100°C to 130°C, it is impossible to ensure that the PBT fibers shrink sufficiently and uneven shrinkage is likely to occur, resulting in wrinkles. In addition, during the temperature rise stage i, the dye cannot be evenly inserted into the fiber cavities due to the excessively rapid temperature rise. Furthermore, with the addition of acidic solution, the dye that has not yet been evenly dispersed will begin to diffuse rapidly into the fiber cavities and the interior of the fiber. Ultimately, this results in a large color difference in the dyed ammonia-free elastic fabric, and due to the color difference, there will also be an increase in local floating dye, which in turn affects the fastness to perspiration.

[0152] Example B2

[0153] A high-temperature acid-conditioning dyeing method for ammonia-free elastic fabrics, comprising the following steps:

[0154] (1) Preparation of raw materials;

[0155] Ammonia-free elastic fabric: The manufacturer is Kunshan Dongli New Material Technology Co., Ltd., the product name is T400, the weight is 129g / m, the width of the raw fabric is 193cm, the warp yarn of the ammonia-free elastic fabric is composed of PET fiber, and the weft yarn is composed of PET / PTT parallel composite fiber;

[0156] The auxiliary solvent consists of chelating dispersant TF-133F (SH), dispersing and leveling agent M-2433K, and water;

[0157] Dye solution: Add 6L of water to blue PX-BL, Xia Liling yellow brown MRDW and pink S-BEL to make a paste. Then add 40L of water and stir with a high-speed mixer for 10 minutes to get dye solution 1. Add dye solution 1 to a cylindrical material tank and dilute with water to 150L to get dye solution 2. Continue to mix and stir for later use.

[0158] Acidic solution: An aqueous solution of an acidic substance, in which the acidic substance is glacial acetic acid;

[0159] Dyeing machine: High temperature and high pressure overflow dyeing machine, its process parameters are: main pump frequency 35HZ, main pump pressure 0.24MPa, cloth speed 530m / min;

[0160] OS-type desizing machine: includes an alkali tank and three washing tanks located after the alkali tank; the temperature in the alkali tank is 95℃, and the temperatures of the washing tanks into which the ammonia-free elastic fabric enters first, the second-first, and the last are 68℃, 60℃, and 45℃, respectively; the flat-width desizing solution in the alkali tank is composed of sodium hydroxide with a concentration of 12g / L, functional scouring agent HS-113L with a concentration of 5g / L, dispersant JN-180N with a concentration of 3g / L, and water;

[0161] (2) Pretreatment of ammonia-free elastic fabrics;

[0162] The ammonia-free elastic fabric is desized in an OS-type desizing machine at a speed of 70 m / min.

[0163] (3) The pretreated ammonia-free elastic fabric and water are added to the high-temperature and high-pressure overflow dyeing machine. Then, the heating stage a is started, and the auxiliary agent solution is added to the high-temperature and high-pressure overflow dyeing machine. After the temperature rises from 33°C to 50°C, the heating stage a ends and the heat preservation stage b begins. At the same time, the dye liquor is added to the high-temperature and high-pressure overflow dyeing machine. The heating rate of the heating stage a is 3°C / min, the temperature of the heat preservation stage b is 50°C, and the heat preservation time of the heat preservation stage b is 2min. The amount of material added was 270 kg, the amount of water added was 1800 L, the amount of auxiliary agent solution added was 40 L, the temperature of the auxiliary agent solution was 30 °C, and when adding the auxiliary agent solution to the dyeing machine, the valve opening was stabilized at 38% using the control method of Example A1, and the feeding time was 5 min. At the end of adding the auxiliary agent solution to the dyeing machine, the concentration of chelating dispersant TF-133F(SH) in the dyeing machine was 0.7 g / L, and the concentration of dispersing and leveling agent M-2433K was 0.7 g / L.

[0164] (4) After the end of the heat preservation stage b in step (3), the heating stage c, heat preservation stage d, heating stage e, heat preservation stage f, heating stage g, heat preservation stage h, heating stage i, and heat preservation stage j are carried out in sequence, and the addition of dye solution is stopped after the end of the heating stage g; wherein, the heating rate of heating stage c, heating stage e, heating stage g, and heating stage i is 1℃ / min, 3℃ / min, 0.5℃ / min, and 0.6℃ / min, respectively, and the heat preservation time of heat preservation stage d, heat preservation stage f, heat preservation stage h, and heat preservation stage j is 5min, 2min, 10min, and 3min, respectively, the temperature of heat preservation stage d is 60℃, the temperature of heat preservation stage f is 85℃, the temperature of heat preservation stage h is 105℃, and the temperature of heat preservation stage j is 117℃;

[0165] In steps (3) to (4), when adding dye liquor to the dyeing machine, the control method of Example A1 is used to stabilize the valve opening at 1%, the feeding time at 70 min, the amount of dye liquor added at 150 L, and the temperature of the dye liquor at 33 °C. At the end of adding dye liquor to the dyeing machine, the mass of blue PX-BL in the dyeing machine is 0.365% of the mass of ammonia-free elastic fabric, the mass of Charling yellow-brown MRDW is 1.02% of the mass of ammonia-free elastic fabric, and the mass of peach red S-BEL is 0.32% of the mass of ammonia-free elastic fabric.

[0166] (5) After the heat preservation stage j ends, the heating stage k begins. At the same time, 120L of acidic solution at 33℃ is added to the dyeing machine. After the temperature reaches the target temperature, the heat preservation stage l begins. When adding acidic solution to the dyeing machine, the valve opening is stabilized at 5.5% using the control method of Example A1. The feeding time is 30min. At the end of adding acidic solution to the dyeing machine, the concentration of acidic substance in the dyeing machine is 0.8g / L. The heating rate of heating stage k is 0.6℃ / min. The temperature of heat preservation stage l is 130℃. The heat preservation time of heat preservation stage l is 50min.

[0167] (6) After the heat preservation stage 1 in step (5) is completed, the temperature is reduced to 70°C at a cooling rate of 1.2°C / min. Then the liquid is drained and the overflow water is washed for 8 minutes to obtain the dyed ammonia-free elastic fabric.

[0168] In steps (2) to (6), the valve control method when adding auxiliary agent solution, dye liquor and acidic solution to the dyeing machine adopts the control method of Example A1, wherein the target feeding rate V*(k) of auxiliary agent solution is 0.06% / s, the target feeding rate V*(k) of dye liquor is 0.015% / s, and the target feeding rate V*(k) of acidic solution is 0.029% / s.

[0169] The final dyed ammonia-free elastic fabric has a color difference value of 0.11, a color fastness to soap washing of grade 4, a color fastness to rubbing of grade 4-5, a color fastness to perspiration of grade 4, and no wrinkles or color wrinkles on the surface of the dyed ammonia-free elastic fabric.

[0170] Example B3

[0171] A high-temperature acid-conditioning dyeing method for ammonia-free elastic fabrics, comprising the following steps:

[0172] (1) Preparation of raw materials;

[0173] Ammonia-free elastic fabric: The manufacturer is Kunshan Dongli New Material Technology Co., Ltd., the product name is T400, the weight is 212g / m, the width of the raw fabric is 190cm, and both the warp and weft yarns of the ammonia-free elastic fabric are composed of PET / PTT parallel composite fibers.

[0174] The auxiliary solvent consists of chelating dispersant TF-133CS, high-temperature leveling agent MDL, and water.

[0175] Dye solution: Add 6L of water to blue E-4R (BS), charrling yellow brown S-2RFLN and pink S-BEL to make a paste. Then add 40L of water and stir with a high-speed mixer for 8 minutes to obtain dye solution 1. Add dye solution 1 to a cylindrical material tank and dilute with water to 140L to obtain dye solution 2. Continue to mix and stir for later use.

[0176] Acidic solution: An aqueous solution of an acidic substance, in which the acidic substance is glacial acetic acid;

[0177] Dyeing machine: High temperature and high pressure overflow dyeing machine, its process parameters are: main pump frequency 34HZ, main pump pressure 0.23MPa, cloth speed 420m / min;

[0178] OS-type desizing machine: includes an alkali tank and three washing tanks located after the alkali tank; the temperature in the alkali tank is 95℃, and the temperatures of the washing tanks into which the ammonia-free elastic fabric enters first, the second-first, and the last are 65℃, 60℃, and 50℃, respectively; the flat-width desizing solution in the alkali tank is composed of sodium hydroxide with a concentration of 11g / L, functional scouring agent HS-113L with a concentration of 5g / L, dispersant JN-180N with a concentration of 3g / L, and water;

[0179] (2) Pretreatment of ammonia-free elastic fabrics;

[0180] The ammonia-free elastic fabric is desized in an OS-type desizing machine at a speed of 40 m / min.

[0181] (3) The pretreated ammonia-free elastic fabric and water are added to the high-temperature and high-pressure overflow dyeing machine. Then, the heating stage a is started, and auxiliary agent solution is added to the high-temperature and high-pressure overflow dyeing machine. After the temperature rises from 25°C to 48°C, the heating stage a ends and the heat preservation stage b begins. At the same time, dye liquor is added to the high-temperature and high-pressure overflow dyeing machine. The heating rate of the heating stage a is 2°C / min, the temperature of the heat preservation stage b is 48°C, and the heat preservation time of the heat preservation stage b is 5min. The amount of fabric added was 260 kg, the amount of water added was 1700 L, the amount of auxiliary agent solution added was 45 L, and the temperature of the auxiliary agent solution was 35 °C. When adding the auxiliary agent solution to the dyeing machine, the valve opening was stabilized at 42.2% using the control method of Example A1, and the feeding time was 4 min. At the end of adding the auxiliary agent solution to the dyeing machine, the concentration of chelating dispersant TF-133CS in the dyeing machine was 0.6 g / L, and the concentration of high-temperature leveling agent MDL was 0.8 g / L.

[0182] (4) After the end of the heat preservation stage b in step (3), the heating stage c, heat preservation stage d, heating stage e, heat preservation stage f, heating stage g, heat preservation stage h, heating stage i, and heat preservation stage j are carried out in sequence, and the addition of dye solution is stopped after the end of the heating stage g; wherein, the heating rate of heating stage c, heating stage e, heating stage g, and heating stage i is 0.9℃ / min, 3.5℃ / min, 0.6℃ / min, and 0.7℃ / min, respectively, and the heat preservation time of heat preservation stage d, heat preservation stage f, heat preservation stage h, and heat preservation stage j is 7min, 4min, 10min, and 4min, respectively, the temperature of heat preservation stage d is 60℃, the temperature of heat preservation stage f is 85℃, the temperature of heat preservation stage h is 103℃, and the temperature of heat preservation stage j is 116℃;

[0183] In steps (3) to (4), when adding dye liquor to the dyeing machine, the control method of Example A1 is used to stabilize the valve opening at 1%, the feeding time at 65 min, the amount of dye liquor added at 140 L, and the temperature of the dye liquor at 35 °C. At the end of adding dye liquor to the dyeing machine, the mass of blue E-4R (BS) in the dyeing machine is 0.447% of the mass of ammonia-free elastic fabric, the mass of Charling yellow-brown S-2RFLN is 0.72% of the mass of ammonia-free elastic fabric, and the mass of peach red S-BEL is 0.257% of the mass of ammonia-free elastic fabric.

[0184] (5) After the heat preservation stage j ends, the heating stage k begins. At the same time, 150L of acidic solution at 35℃ is added to the dyeing machine. After the temperature reaches the target temperature, the heat preservation stage l begins. When adding acidic solution to the dyeing machine, the valve opening is stabilized at 10% using the control method of Example A1. The feeding time is 25min. At the end of adding acidic solution to the dyeing machine, the concentration of acidic substance in the dyeing machine is 0.8g / L. The heating rate of heating stage k is 0.5℃ / min. The temperature of heat preservation stage l is 130℃. The heat preservation time of heat preservation stage l is 50min.

[0185] (6) After the heat preservation stage 1 in step (5) is completed, the temperature is reduced to 70°C at a cooling rate of 1.2°C / min. Then the liquid is drained and the overflow water is washed for 8 minutes to obtain the dyed ammonia-free elastic fabric.

[0186] In steps (2) to (6), the valve control method when adding auxiliary agent solution, dye liquor and acidic solution to the dyeing machine adopts the control method of Example A1, wherein the target feeding rate V*(k) of auxiliary agent solution is 0.08% / s, the target feeding rate V*(k) of dye liquor is 0.016% / s, and the target feeding rate V*(k) of acidic solution is 0.045% / s.

[0187] The final dyed ammonia-free elastic fabric has a color difference value of 0.2, a color fastness to soaping of 4-5, a color fastness to rubbing of 4-5, a color fastness to perspiration of 4-5, and no wrinkles or color wrinkles on the surface of the dyed ammonia-free elastic fabric.

[0188] Example B4

[0189] A high-temperature acid-conditioning dyeing method for ammonia-free elastic fabrics, comprising the following steps:

[0190] (1) Preparation of raw materials;

[0191] Ammonia-free elastic fabric: The manufacturer is Suzhou Qianhuanxue Textile Co., Ltd., the product name is T400, the weight is 198g / m, the width of the raw fabric is 198cm, the weft yarn of the ammonia-free elastic fabric is composed of PET fiber, and the warp yarn is composed of PET / PTT parallel composite fiber;

[0192] The auxiliary solvent consists of water quality balancing agent M-1075P, leveling agent (composed of high-efficiency repair agent TF-216BA and leveling agent TF-212K in a mass ratio of 4:3) and water;

[0193] Dye solution: Add 10L of water to blue E-4R(BS), deep blue H-GL, yellow brown S-2RFL and red SE-2GF to make a paste. Then add 50L of water and stir with a high-speed mixer for 15 minutes to obtain dye solution 1. Add dye solution 1 to a cylindrical material tank and dilute with water to 160L to obtain dye solution 2. Continue to mix and stir for later use.

[0194] Acidic solution: An aqueous solution of an acidic substance, in which the acidic substance is glacial acetic acid;

[0195] Dyeing machine: High temperature and high pressure overflow dyeing machine, its process parameters are: main pump frequency 35HZ, main pump pressure 0.23MPa, cloth speed 450m / min;

[0196] OS-type desizing machine: includes an alkali tank and three washing tanks located after the alkali tank; the temperature in the alkali tank is 95℃, and the temperatures of the washing tanks into which the ammonia-free elastic fabric enters first, the second-first, and the last are 70℃, 60℃, and 50℃, respectively; the flat-width desizing solution in the alkali tank is composed of sodium hydroxide with a concentration of 15g / L, functional scouring agent HS-113L with a concentration of 6g / L, dispersant JN-180N with a concentration of 3.0g / L, and water;

[0197] (2) Pretreatment of ammonia-free elastic fabrics;

[0198] The ammonia-free elastic fabric is desized in an OS-type desizing machine at a flat width; the machine speed is 50m / min.

[0199] (3) The pretreated ammonia-free elastic fabric and water are added to the high-temperature and high-pressure overflow dyeing machine. Then, the heating stage a is started, and the auxiliary agent solution is added to the high-temperature and high-pressure overflow dyeing machine. After the temperature rises from 30°C to 50°C, the heating stage a ends and the heat preservation stage b begins. At the same time, the dye liquor is added to the high-temperature and high-pressure overflow dyeing machine. The heating rate of the heating stage a is 4°C / min, the temperature of the heat preservation stage b is 50°C, and the heat preservation time of the heat preservation stage b is 3min. The amount of ammonia-free elastic fabric added was 300 kg, the amount of water added was 1800 L, the amount of auxiliary agent solution added was 50 L, and the temperature of the auxiliary agent solution was 33 °C. When adding the auxiliary agent solution to the dyeing machine, the valve opening was stabilized at 43.8% using the control method of Example A1, and the feeding time was 4 min. At the end of adding the auxiliary agent solution to the dyeing machine, the concentration of water quality balancing agent M-1075P in the dyeing machine was 0.8 g / L, and the concentration of leveling agent was 0.8 g / L.

[0200] (4) After the end of the heat preservation stage b in step (3), the heating stage c, heat preservation stage d, heating stage e, heat preservation stage f, heating stage g, heat preservation stage h, heating stage i, and heat preservation stage j are carried out in sequence, and the addition of dye solution is stopped after the end of the heating stage g; wherein, the heating rate of heating stage c, heating stage e, heating stage g, and heating stage i is 1.2℃ / min, 5℃ / min, 0.8℃ / min, and 0.8℃ / min, respectively, and the heat preservation time of heat preservation stage d, heat preservation stage f, heat preservation stage h, and heat preservation stage j is 10min, 5min, 15min, and 5min, respectively, the temperature of heat preservation stage d is 65℃, the temperature of heat preservation stage f is 90℃, the temperature of heat preservation stage h is 110℃, and the temperature of heat preservation stage j is 120℃;

[0201] In steps (3) to (4), when adding dye liquor to the dyeing machine, the valve opening is stabilized at 1.5% using the control method of Example A1, the feeding time is 60 min, the amount of dye liquor added is 160 L, and the temperature of the dye liquor is 32 °C. At the end of adding dye liquor to the dyeing machine, the mass of blue E-4R(BS) in the dyeing machine is 0.46% of the mass of ammonia-free elastic fabric, the mass of dark blue H-GL is 2.24% of the mass of ammonia-free elastic fabric, the mass of yellow brown S-2RFL is 0.6% of the mass of ammonia-free elastic fabric, and the mass of red SE-2GF is 0.2% of the mass of ammonia-free elastic fabric.

[0202] (5) After the heat preservation stage j ends, the heating stage k begins. At the same time, 150L of acidic solution at 32℃ is added to the dyeing machine. After the temperature reaches the target temperature, the heat preservation stage l begins. When adding acidic solution to the dyeing machine, the valve opening is stabilized at 4.8% using the control method of Example A1. The feeding time is 40min. At the end of adding acidic solution to the dyeing machine, the concentration of acidic substance in the dyeing machine is 1.2g / L. The heating rate of heating stage k is 0.5℃ / min. The temperature of heat preservation stage l is 130℃. The heat preservation time of heat preservation stage l is 60min.

[0203] (6) After the heat preservation stage 1 in step (5) is completed, the temperature is reduced to 70°C at a cooling rate of 1°C / min. Then the liquid is drained and the overflow water is washed for 10 minutes to obtain the dyed ammonia-free elastic fabric.

[0204] In steps (2) to (6), the valve control method when adding auxiliary agent solution, dye liquor and acidic solution to the dyeing machine adopts the control method of Example A1, wherein the target feeding rate V*(k) of auxiliary agent solution is 0.09% / s, the target feeding rate V*(k) of dye liquor is 0.02% / s, and the target feeding rate V*(k) of acidic solution is 0.027% / s.

[0205] The final dyed ammonia-free elastic fabric has a color difference value of 0.25, a color fastness to soaping of grade 4, a color fastness to rubbing of grade 4-5, a color fastness to perspiration of grade 4, and no wrinkles or color wrinkles on the surface of the dyed ammonia-free elastic fabric.

[0206] Comparative Example 2

[0207] A high-temperature acid-adjusting dyeing method for ammonia-free elastic fabric is basically the same as that in Example B4, except that the heating endpoint of step (4) heating stage i is 111°C and the temperature of the heat preservation stage j is 111°C.

[0208] The final color difference value of the dyed ammonia-free elastic fabric was 1.06, the color fastness to rubbing was grade 4, the color fastness to perspiration was grade 3-4, and wrinkles appeared on the surface of the dyed ammonia-free elastic fabric.

[0209] Comparing Comparative Example 2 and Example B4, it can be seen that the color difference value of the dyed ammonia-free elastic fabric obtained in this comparative example is increased, and the color fastness to rubbing and perspiration is decreased. This is because the temperature of the heat preservation stage j in this comparative example is too low, which causes the PBT fibers to not shrink sufficiently, resulting in poor uniformity of dye entering the fiber cavities. While adding an acidic solution will accelerate the dye entering the fiber cavities and diffusing into the fiber interior, the temperature inside the dyeing machine is too low and the dye concentration outside the fiber is still relatively high when adding the acidic solution, which aggravates the phenomenon of dye competition, increases the amount of floating dye, and thus affects the color fastness to rubbing and perspiration. At the same time, the shrinkage of the entire system fibers will also lead to uneven dyeing of the fibers, causing color difference problems.

[0210] Comparative Example 3

[0211] A high-temperature acid-adjusting dyeing method for ammonia-free elastic fabric is basically the same as that in Example B4, except that the heating endpoint of step (4) heating stage i is 127°C and the temperature of the heat preservation stage j is 127°C.

[0212] The final color difference value of the dyed ammonia-free elastic fabric was 0.92, the color fastness to rubbing was grade 4, the color fastness to perspiration was grade 3-4, and wrinkles appeared on the surface of the dyed ammonia-free elastic fabric.

[0213] Comparing Comparative Example 3 and Example B4, it can be seen that the color difference value of the dyed ammonia-free elastic fabric obtained in this comparative example is increased, and the color fastness to rubbing and perspiration is decreased. This is because the temperature of the heat preservation stage j in this comparative example is too high, which leads to a decrease in the uniformity of PBT fiber shrinkage. It is difficult for the dye to enter the fiber cavities evenly. In addition, the acid solution is added too late, which increases the kinetic energy of the dye and weakens the binding ability between the dye and the fiber. This makes it easy for the dye to desorb from the inside of the fiber, greatly reducing the color difference and color stability. This results in an increase in local floating color and a decrease in the color fastness to washing, rubbing, and perspiration.

[0214] Comparative Example 4

[0215] A high-temperature acid-conditioning dyeing method for ammonia-free elastic fabric is basically the same as in Example B4, except that the addition of acidic solution to the dyeing machine is performed during the heat preservation stage 1.

[0216] The final color difference value of the dyed ammonia-free elastic fabric was 1.68, the color fastness to washing was 3-4, the color fastness to rubbing was 4, the color fastness to perspiration was 3, and color wrinkles appeared on the surface of the dyed ammonia-free elastic fabric.

[0217] Comparing Comparative Example 4 and Example B4, it can be seen that the color difference value of the dyed ammonia-free elastic fabric obtained in this comparative example is increased, and the color fastness to washing, rubbing, and perspiration is decreased. This is because the acid solution is added too late. As the temperature rises, the dye kinetic energy increases, and the dye's binding ability with the fiber is weak, causing the dye to desorb from the inside of the fiber. The dyeing color difference and color stability are greatly reduced. The large color difference also leads to an increase in local floating color, resulting in a decrease in the color fastness to washing, rubbing, and perspiration.

[0218] Comparative Example 5

[0219] A high-temperature acid-conditioning dyeing method for ammonia-free elastic fabric is basically the same as in Example B4, except that the addition of acidic solution to the dyeing machine is performed at the beginning of the heat preservation stage j.

[0220] The final dyed ammonia-free elastic fabric has a color difference value of 0.45 and a rubbing fastness of grade 4.

[0221] Comparing Comparative Example 5 and Example B4, it can be seen that the color difference value of the dyed ammonia-free elastic fabric obtained in this comparative example is increased and the color fastness to rubbing is reduced. This is because the fibers need a certain amount of time to fully shrink after entering the heat preservation stage. When acidic solution is added at this time, the dye will accelerate its penetration into the fiber interior, which may not be able to ensure that the fibers in different positions of the fabric have fully shrunk, increasing the uneven dyeing of fibers in different positions. At this time, color difference problems are likely to occur in the dyed fabric. Due to the color difference, there will be an increase in local floating dye, which reduces the color fastness to rubbing.

[0222] Example B5

[0223] A high-temperature acid-conditioning dyeing method for ammonia-free elastic fabrics, comprising the following steps:

[0224] (1) Preparation of raw materials;

[0225] Ammonia-free elastic fabric: The manufacturer is Jiangsu Chuanhong Fabric Co., Ltd., the product name is T800, the weight is 156g / m, the width of the raw fabric is 195cm, the warp yarn of the ammonia-free elastic fabric is composed of PET / PBT parallel composite fiber, and the weft yarn is composed of PET fiber;

[0226] The auxiliary solvent consists of a dispersant (composed of AD-G and chelating dispersant TF-133CS in a mass ratio of 1:1), a high-efficiency repair agent TF-216BA, and water.

[0227] Dye solution: Add 5L of water to blue E-4R (BS), yellow AC-E and pink S-BEL to make a paste. Then add 30L of water and stir with a high-speed mixer for 5 minutes to get dye solution 1. Add dye solution 1 to a cylindrical container and dilute with water to 120L to get dye solution 2. Continue to mix and stir for later use.

[0228] Acidic solution: An aqueous solution of an acidic substance, such as ammonium sulfate;

[0229] Dyeing machine: High temperature and high pressure overflow dyeing machine, its process parameters are: main pump frequency 35HZ, main pump pressure 0.24MPa, cloth speed 500m / min;

[0230] OS-type desizing machine: includes an alkali tank and three washing tanks located after the alkali tank; the temperature in the alkali tank is 90℃, and the temperatures of the washing tanks into which the ammonia-free elastic fabric enters first, the second-first, and the last are 60℃, 50℃, and 40℃, respectively; the flat-width desizing solution in the alkali tank is composed of sodium hydroxide with a concentration of 8g / L, functional scouring agent HS-113L with a concentration of 3g / L, dispersant JN-180N with a concentration of 1g / L, and water;

[0231] (2) Pretreatment of ammonia-free elastic fabrics;

[0232] The ammonia-free elastic fabric is desized in an OS-type desizing machine at a speed of 40 m / min.

[0233] (3) such as Figure 2 As shown, the pretreated ammonia-free elastic fabric and water are added to a high-temperature, high-pressure overflow dyeing machine. Then, the heating stage (a) begins, and an auxiliary agent solution is added to the machine. After heating from 30°C to 45°C, heating stage (a) ends, and the machine enters the holding stage (b), where dye liquor is added. The heating rate in heating stage (a) is 3°C / min, the temperature in holding stage (b) is 45°C, and the holding time in holding stage (b) is 2 minutes. The amount of ammonia-free elastic fabric added was 235 kg, the amount of water added was 1500 L, the amount of auxiliary agent solution added was 44 L, the temperature of the auxiliary agent solution was 25 °C, and when adding the auxiliary agent solution to the dyeing machine, the valve opening was stabilized at 46.6% using the control method of Example A1, and the feeding time was 3 min. At the end of adding the auxiliary agent solution to the dyeing machine, the concentration of dispersant in the dyeing machine was 0.6 g / L, and the concentration of high-efficiency repair agent TF-216BA was 0.6 g / L.

[0234] (4) such as Figure 2As shown, after the end of the heat preservation stage b in step (3), the heating stage c, heat preservation stage d, heating stage e, heat preservation stage f, heating stage g, heat preservation stage h, heating stage i, and heat preservation stage j are carried out in sequence, and the addition of dye solution is stopped after the end of the heating stage g; wherein, the heating rates of heating stages c, heating stages e, heating stages g, and heating stages i are 0.8℃ / min, 3℃ / min, 0.5℃ / min, and 0.5℃ / min, respectively, and the heat preservation times of heat preservation stages d, heat preservation stages f, heat preservation stages h, and heat preservation stages j are 5min, 2min, 12min, and 2min, respectively, the temperature of heat preservation stage d is 55℃, the temperature of heat preservation stage f is 80℃, the temperature of heat preservation stage h is 100℃, and the temperature of heat preservation stage j is 115℃;

[0235] In steps (3) to (4), when adding dye liquor to the dyeing machine, the valve opening is stabilized at 0.5% using the control method of Example A1, the feeding time is 75 min, the amount of dye liquor added is 120 L, and the temperature of the dye liquor is 31 °C. At the end of adding dye liquor to the dyeing machine, the mass of blue E-4R (BS) in the dyeing machine is 0.005% of the mass of ammonia-free elastic fabric, the mass of yellow AC-E is 0.01% of the mass of ammonia-free elastic fabric, and the mass of pink S-BEL is 0.015% of the mass of ammonia-free elastic fabric.

[0236] (5) such as Figure 2 As shown, after the heat preservation stage j ends, the heating stage k begins, and 100L of acidic solution at 25°C is added to the dyeing machine. After the temperature reaches the target temperature, the heat preservation stage l begins. When adding the acidic solution to the dyeing machine, the valve opening is stabilized at 5.4% using the control method of Example A1, and the feeding time is 25min. At the end of adding the acidic solution to the dyeing machine, the concentration of acidic substance in the dyeing machine is 0.4g / L. The heating rate of heating stage k is 1°C / min, the temperature of heat preservation stage l is 135°C, and the heat preservation time of heat preservation stage l is 40min.

[0237] (6) After the heat preservation stage 1 in step (5) is completed, the temperature is reduced to 70°C at a cooling rate of 1.5°C / min. Then the liquid is drained and the overflow water is washed for 5 minutes to obtain the dyed ammonia-free elastic fabric.

[0238] In steps (2) to (6), the valve control method when adding auxiliary agent solution, dye liquor and acidic solution to the dyeing machine adopts the control method of Example A1, wherein the target feeding rate V*(k) of auxiliary agent solution is 0.11% / s, the target feeding rate V*(k) of dye liquor is 0.012% / s, and the target feeding rate V*(k) of acidic solution is 0.029% / s.

[0239] The final dyed ammonia-free elastic fabric has a color difference value of 0.12, a color fastness to soap washing of grade 4-5, a color fastness to rubbing of grade 4-5, a color fastness to perspiration of grade 4-5, and no wrinkles or color wrinkles on the surface of the dyed ammonia-free elastic fabric.

[0240] Example B6

[0241] A high-temperature acid-adjusting dyeing method for ammonia-free elastic fabric is basically the same as that in Example B5, except that: in steps (2) to (6), when adding auxiliary solution, dye liquor and acid solution to the dyeing machine, the control method of Example A1 is not used. When adding auxiliary solution to the dyeing machine, the initial value of valve opening is 46.6%. When adding dye liquor to the dyeing machine, the initial value of valve opening is 0.5%. When adding acid solution to the dyeing machine, the initial value of valve opening is 5.4%. The valve opening is not actively adjusted throughout the process.

[0242] The final dyed ammonia-free elastic fabric has a color difference value of 0.29, a color fastness to soaping of grade 4-5, a color fastness to rubbing of grade 4-5, a color fastness to perspiration of grade 4, and no wrinkles or color wrinkles on the surface of the dyed ammonia-free elastic fabric.

Claims

1. A high-temperature acid-conditioning dyeing method for ammonia-free elastic fabric, wherein the ammonia-free elastic fabric contains PET / PBT parallel composite fibers or PET / PTT parallel composite fibers, comprising adding auxiliary agent solution, dye liquor and acid solution to a dyeing machine, the entire process comprising a heat preservation stage h and a heat preservation stage l, wherein the temperature of heat preservation stage h is 100-110℃ and the temperature of heat preservation stage l is 130-135℃, characterized in that, The entire process also includes heating stage i, heat preservation stage j, and heating stage k; The heat preservation stage h, the heating stage i, the heat preservation stage j, the heating stage k, and the heat preservation stage l are sequentially adjacent; The temperature during the heat preservation stage is 115-120℃; The addition of acidic solution to the dyeing machine begins at the heating stage k, with a heating rate of 0.5-1.0℃ / min. The addition time is 25-40 min. At the end of the addition of dye solution, the mass of dye in the dyeing machine is 1.424-3.5% of the mass of the ammonia-free elastic fabric. The entire process also includes sequentially adjacent heating stage a and holding stage b; the temperature of holding stage b is 45-50℃; the operation of adding dye liquor into the dyeing machine begins at the end of heating stage a.

2. The high-temperature acid-adjusting dyeing method for ammonia-free elastic fabric according to claim 1, characterized in that, When adding auxiliary agent solution, dye liquor, and acidic solution to the dyeing machine, uniform feeding is achieved by adjusting the valve opening in real time. The valve is installed between the cylindrical material tank and the dyeing machine. The cylindrical material tank is used to hold the auxiliary agent solution, dye liquor, or acidic solution. When adding auxiliary agent solution to the dyeing machine, the valve opening range is 38-60%, and the feeding time is 2-5 minutes. When adding dye liquor to the dyeing machine, the valve opening range is 0.5-1.5%, and the feeding time is 60-75 minutes. When adding acidic solution to the dyeing machine, the valve opening range is 2.8-10%.

3. The high-temperature acid-adjusting dyeing method for ammonia-free elastic fabric according to claim 2, characterized in that, The valve is an electrically adjustable proportional valve; the steps for adding the auxiliary agent solution, dye liquor, and acidic solution to the dyeing machine are as follows: (a) A level sensor is installed inside a cylindrical container. An auxiliary agent solution, dye solution, or acidic solution is added to the container. When the liquid level in the container reaches its minimum value, the output current of the level sensor is I. min When the liquid level in the cylindrical container reaches its maximum value, the output current of the liquid level sensor is I. max ; (b) Apply current I* to the valve so that the valve opening u(k) reaches its minimum value; (c) Let k=1; (d) During the k-th cycle, the output current I of the liquid level sensor is acquired in real time, and the liquid level percentage P of the cylindrical tank is calculated in real time, P=(II) min ) / ( I max -I min )×100%, and then calculate the rate of change of the liquid level percentage P in the cylindrical tank with time t, and use it as the actual feeding rate V(k); The duration of each cycle is 20ms; (e) Calculate the valve opening adjustment value Δu(k); when hour, ; when , ; when hour, ; In the formula, the unit of Δu(k) is % %. Ve(k) = V*(k) - V(k), where V*(k) represents the target feeding rate. The target feeding rate V*(k) for the auxiliary agent solution is 0.06-0.25% / s, the target feeding rate V*(k) for the dye solution is 0.011-0.020% / s, and the target feeding rate V*(k) for the acidic solution is 0.015-0.045% / s. ε1 is 0.05% / s; ε2 is 0.2% / s; It is 65; It is 0.0186; =0; =900×C+20, where C is the value of Ve(k) in % / s; It is 2 / 125; =0; It is 200; It is 0.016; =0; r is a coefficient with a value of 1, used to ensure that the physical units on both sides of the formula are consistent; When k=1, let =0; when k≤2, let =0; (f) Adjust the current I* supplied to the valve so that the valve opening u(k) increases by Δu(k); (g) Determine whether the feeding time has reached the set value. If so, adjust the current I* supplied to the valve so that the valve opening u(k) reaches the minimum value; otherwise, let k=k+1 and return to step (d).

4. The high-temperature acid-conditioning dyeing method for ammonia-free elastic fabric according to claim 1, characterized in that, The entire process also includes sequentially adjacent heating stage c, heat preservation stage d, heating stage e, heat preservation stage f, and heating stage g; The heat preservation stage b is adjacent to the heating stage c, and the heating stage g is adjacent to the heat preservation stage h. The temperature during the heat preservation stage d is 55-65℃, and the temperature during the heat preservation stage f is 80-90℃.

5. The high-temperature acid-adjusting dyeing method for ammonia-free elastic fabric according to claim 4, characterized in that, The holding times for heat preservation stages b, d, f, h, j, and l are 2-5 min, 5-10 min, 2-5 min, 10-15 min, 2-5 min, and 40-60 min, respectively; the heating times for heating stages a, c, e, g, and i are 2-4℃ / min, 0.8-1.2℃ / min, 3-5℃ / min, 0.5-0.8℃ / min, and 0.5-0.8℃ / min, respectively.

6. The high-temperature acid-adjusting dyeing method for ammonia-free elastic fabric according to claim 4, characterized in that, Before the heating stage a, the ammonia-free elastic fabric is added to the dyeing machine along with water. The amount of ammonia-free elastic fabric added is 235-360 kg, and the amount of water added is 1500-2100 L.

7. The high-temperature acid-conditioning dyeing method for ammonia-free elastic fabric according to claim 4, characterized in that, The addition of the auxiliary agent solution to the dyeing machine is performed during the heating phase a.

8. The high-temperature acid-conditioning dyeing method for ammonia-free elastic fabric according to claim 1, characterized in that, The auxiliary agent solution consists of a dispersant, a leveling agent, and water. The amount of auxiliary agent solution added is 40-50L, and the temperature of the auxiliary agent solution is 25-35℃. At the end of adding the auxiliary agent solution into the dyeing machine, the concentration of the dispersant or leveling agent in the dyeing machine is 0.6-0.8g / L.

9. The high-temperature acid-conditioning dyeing method for ammonia-free elastic fabric according to claim 1, characterized in that, The amount of dye solution added is 120-160L, and the temperature of the dye solution is 30-35℃.

10. The high-temperature acid-conditioning dyeing method for ammonia-free elastic fabric according to claim 1, characterized in that, The acidic solution is an aqueous solution of an acidic substance, which is ammonium sulfate or glacial acetic acid. The amount of acidic solution added is 100-150L, ​​and the temperature of the acidic solution is 25-35℃. At the end of adding the acidic solution to the dyeing machine, the concentration of the acidic substance in the dyeing machine is 0.4-1.2g / L.

11. The high-temperature acid-conditioning dyeing method for ammonia-free elastic fabric according to claim 1, characterized in that, The dyeing machine is a high-temperature and high-pressure overflow dyeing machine. The process parameters of the high-temperature and high-pressure overflow dyeing machine are: main pump frequency 32-35HZ, main pump pressure 0.2-0.24MPa, and cloth speed 380-530m / min.

12. The high-temperature acid-conditioning dyeing method for ammonia-free elastic fabric according to claim 1, characterized in that, The warp and weft yarns of the ammonia-free elastic fabric are both composed of PET / PBT parallel composite fibers or PET / PTT parallel composite fibers, or the warp yarns are composed of PET / PBT parallel composite fibers or PET / PTT parallel composite fibers and the weft yarns are composed of PET fibers, or the warp yarns are composed of PET fibers and the weft yarns are composed of PET / PBT parallel composite fibers or PET / PTT parallel composite fibers.

13. A high-temperature acid-conditioning dyeing method for ammonia-free elastic fabric according to any one of claims 1 to 12, characterized in that, The color difference value of the dyed ammonia-free elastic fabric is <0.3, the color fastness to soaping is grade 4 or above, the color fastness to rubbing is grade 4 or above, and the color fastness to perspiration is grade 4 or above.

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