One-bath dyeing method for polyester blended fabric

Abstract

The invention discloses a polyester blended fabric one-bath dyeing method which comprises the following process steps: putting a polyester chemical fiber fabric into a dyeing solution containing a low-temperature refining agent, a chelating dispersant and sodium hydrosulfite according to a bath ratio of 1: 5, soaking for 10-20 minutes by using an acetic acid aqueous solution, diluting a disperse dye by using a dispersant, adding the diluted disperse dye into the dyeing solution, and uniformly stirring; compared with a traditional dyeing process, the low-temperature refining agent, the chelating dispersant, the sodium dithionite, the acetic acid water, the hydrogen peroxide and the sodium carbonate are added, contaminated stains and surface impurities are removed, and the dyeing rate and uniformity of the fabric are remarkably improved; thiourea dioxide series sodium hydrosulfite is added, so that stains and surface impurities are further removed, and the dye-uptake rate and color fastness of the fabric are improved; a disperse dye is diluted with a dispersing agent, and a penetrating agent is added, so that the fabric uniformly permeates, and the efficient level dyeing effect is achieved; the to-be-dyed fabric is repeatedly dip-dyed, so that the dyeing effect and the dyeing uniformity are obviously improved.

Description

Technical Field

[0001] The invention belongs to the technical field of polyester blended fabric printing and dyeing, and specifically relates to a polyester blended fabric one-bath dyeing method. Background Art

[0002] Blended fabrics are composed of two or more fibers. Different fibers have different coloring properties, some are similar, and some are different. For example, cotton is similar to viscose fibers, but different from synthetic fibers. In the dyeing process of blended fabrics, fibers with different coloring properties have different adsorption and fixation abilities to certain dyes, resulting in color differences. In addition, various fibers have different affinities for the same dye, and their dyeing properties will also be different. When using disperse dyes to dye polyester fibers and direct dyes to dye cotton fibers, cotton fibers do not adsorb disperse dyes, and polyester fibers do not adsorb direct dyes either.

[0003] In the process of printing and dyeing, disperse dyes and other types of dyes or dyeing auxiliaries have poor compatibility, and generally a segmented processing technology is required, that is, polyester chemical fiber fabrics are first dyed with disperse dyes, and then processed with other dyes or dyeing auxiliaries. The process flow is complicated, the production cycle is long, the production efficiency is low, the energy consumption is high, and the processing cost is high.

[0004] The dyeing process is to dye cotton first and then polyester. Put the polyester-cotton blended knitted fabric into the dye solution containing refining agent, alkali agent, soaping agent and corresponding auxiliaries. First dye the cotton, then remove the dye solution, and then add disperse dyes, a small amount of alkali agent, dye enhancer and carrier to color the polyester fiber. Finally, wash with water to remove the floating color on the cotton and the floating color on the polyester, and soap the polyester with the soaping agent. Obviously, such a process is complicated, affects efficiency, wastes water resources and electricity, and increases production costs.

[0005] To solve the above problems, in the prior art, the blended fabric is pre-shaped - dyed - dehydrated - loose drying - soaked - regained moisture - opened - shaped; before dyeing, a shaping operation is required, the production process is long, the efficiency is low, and the production cost is high.

[0006] Therefore, the present invention is proposed to solve the above problems. Summary of the invention

[0007] The technical problem to be solved by the present invention is that the traditional polyester dyeing process has the technical problems of high energy consumption and long process flow. A polyester blended fabric one-bath dyeing method is used to dye polyester chemical fiber fabrics with cotton yarn, viscose blended fabric, linen yarn or silk fabric with disperse dyes in one bath, and the dyeing effect reaches the level of single dyeing polyester, so as to overcome the shortcomings of the prior art. By dyeing polyester blended fibers in one bath, production energy consumption can be reduced and the amount of printing and dyeing wastewater discharged can be reduced.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0009] A one-bath dyeing method for polyester blended fabrics comprises the following steps: (1) placing polyester chemical fiber fabrics in a dyeing solution containing 0.5-1.5 g / L low-temperature refining agent, 0.5-2 g / L chelating dispersant and 2-3 g / L sodium dithionite at a bath ratio of 1:5, keeping the temperature for 10-20 minutes, then heating the temperature to 75-85°C and keeping the temperature for 15-20 minutes, then cooling the temperature to 70°C, soaking in 0.5-1.5 g / L acetic acid aqueous solution for 10-20 minutes, then heating the temperature to 85-95°C and continuing to soak for 10-20 minutes, draining the liquid, washing with water, and completing the oil and impurity removal process; (2) adding water to the dyeing vat, diluting the disperse dye with 1-5 g / L dispersant and then adding it, controlling the adding speed, adding time to 30-40 minutes, and stirring while adding ; (3) When the bath temperature reaches 60°C, add 0.05-0.5g / L hydrogen peroxide, control the heating rate to be lower than 0.8°C / min, so that the dye solution is evenly dispersed; when the bath temperature reaches 80°C, add 4.5-5.5g / L soda ash, then control the heating rate to uniformly heat to 130±2°C at 1-2°C / min, and keep warm for 30-60 minutes; (4) After keeping warm, cool to 65-70°C at 1-2°C / min, drain, wash with water, and perform reduction cleaning to complete the dyeing process; (5) The reduction cleaning process is as follows: put the polyester blended fabric into the dye solution containing 0.5-1.5g / L soap detergent, run for 10-20 minutes, then heat to 80-85°C, keep warm for 10-20 minutes, drain, wash with water, and complete the reduction cleaning process.

[0010] Further, the polyester chemical fiber fabric is placed in a dye solution containing 4-5g / L of dispersant, and the dyed polyester fabric is added, and the temperature is first raised to 60-70°C, then raised to 80°C, and then raised to 130°C, kept warm, and then cooled to 65-70°C at 1-2°C / min, and the liquid is drained, washed with water, and reduced to complete the dyeing process.

[0011] Furthermore, the reduction cleaning process is as follows: placing the polyester blended fabric into a dye solution containing 4.5-5 g / L thiourea dioxide-based hydrosulfur powder, first running it for 10-20 minutes, then heating it to 80-85°C, keeping it warm for 10-20 minutes, draining the liquid, and washing it with water to complete the reduction cleaning process.

[0012] Furthermore, in the process of preparing the dispersion, the disperse dye is diluted 200-250 times with the dispersant.

[0013] Furthermore, 2-4 g / L of penetrant is added to the dye solution in step (1).

[0014] Furthermore, it includes a dye vat and a liquid collector which are connected through a liquid delivery pipeline, an injection head is arranged inside the liquid collector dye vat, and auxiliary liquid is input through the injection head, a valve switch is arranged on the liquid delivery pipeline, a pressure safety valve is arranged on the top of the liquid collector, a first liquid level meter and a first liquid level meter sensor are arranged on the liquid collector, the valve switch of the liquid delivery pipeline controls the injection flow of the auxiliary liquid, and also includes an external main controller, which is connected to the pressure safety valve, the valve switch, and the first liquid level meter sensor.

[0015] Furthermore, the auxiliary liquid of the liquid collector is injected into the dye vat from the injection port through a pressure pump. The dye vat is provided with a second liquid level meter and a second liquid level meter controller. The top of the dye vat has an air inlet and an outlet. The second liquid level meter and the second liquid level meter controller are used to detect the liquid level height in the dye vat in real time.

[0016] Furthermore, after the auxiliary liquid enters the dye vat for dyeing, the dye liquid is pressed out into the liquid collector, and then is led out from the liquid collector and injected into the dye vat for repeated immersion dyeing.

[0017] Furthermore, in the initial stage of the immersion dyeing operation, the fabric to be dyed, the dye, and the auxiliary liquid immersed in the liquid are mixed to form an initial dye concentration C1, the dyeing time is 10 minutes, the dye liquid is discharged, and after acid washing, the dye is mixed again to form a second dye liquid concentration C2, the dyeing time is 15 minutes, the dye liquid is discharged, after the initial water washing, the dye is mixed again to form a third dye liquid concentration C3, the dyeing time is 20 minutes, the dye liquid is discharged, after soap washing, the dye is mixed again to form a fourth dye liquid concentration C4, the dyeing time is 30 minutes, the dye liquid is discharged, and after water washing, the dye liquid is discharged.

[0018] Furthermore, the second dye solution concentration C2 is higher than the initial concentration C1, the third dye solution concentration C3 is greater than the second dye solution concentration C2, and the fourth dye solution concentration C4 is greater than the third dye solution concentration C3.

[0019] The beneficial effects of the present invention are as follows: compared with the common dyeing process, the present invention adds a low-temperature refining agent, a chelating dispersant, sodium dithionite, acetic acid water, hydrogen peroxide and soda ash to remove stained stains and surface impurities, and significantly improve the fabric dyeing rate and uniformity; in the process of reduction cleaning, thiourea dioxide-based insurance powder is added to further remove stained stains and surface impurities, and improve the fabric dyeing rate and color fastness; disperse dyes are diluted with dispersants, and disperse dyes are hydrolyzed into small-molecule disperse dyes, thereby increasing their affinity with fibers, which is beneficial to the dyeing of polyester chemical fiber fabrics; a penetrant is added to make the fabric evenly penetrated to achieve the effect of efficient and uniform dyeing; the fabric to be dyed is repeatedly dip-dyed for multiple times, and the dyeing effect and dyeing uniformity are significantly improved.

[0020] The one-bath dyeing method for polyester chemical fiber fabrics can effectively reduce energy consumption and wastewater discharged during the dyeing of chemical fiber fabrics.

[0021] Dyeing polyester chemical fiber fabrics, cotton fabrics, viscose fabrics, linen fabrics, and silk fabrics in the same bath greatly shortens the dyeing time, thereby effectively improving the production efficiency of the dyeing factory, increasing the color yield of the dyed cloth, and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of the liquid collector 3 in the embodiment;

[0023] Figure 2 It is a schematic diagram of the structure of the dyeing vat 2 in the embodiment. DETAILED DESCRIPTION

[0024] Below, refer to the attached Figure 1-2 A one-bath dyeing method for polyester blended fabrics according to the present invention is described in detail. In order to make the purpose, technical scheme and advantages of the present utility model clearer, the technical scheme in the embodiment of the present invention will be clearly and completely described below in combination with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments.

[0025] Therefore, the following detailed description of the embodiments of the present disclosure provided in conjunction with the accompanying drawings is not intended to limit the scope of the present disclosure claimed for protection, but merely represents selected embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present disclosure.

[0026] Unless otherwise defined in the context, the singular includes the plural. Throughout the specification, the terms "comprising", "having", etc. are used herein to specify the presence of the features, numbers, steps, operations, elements, parts or combinations thereof, but do not exclude the presence or addition of one or more other features, numbers, steps, operations, elements, parts or combinations thereof.

[0027] In addition, even though terms including ordinal numbers such as "first," "second," etc. may be used to describe various components, these components are not limited by these terms, and these terms are only used to distinguish one element from other elements. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component without departing from the scope of the present disclosure.

[0028] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the disclosed product is usually placed when in use, or are directions or positional relationships commonly understood by those skilled in the art. These are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present disclosure.

[0029] The present invention discloses a one-bath dyeing method for polyester blended fabrics, according to one embodiment, comprising the following process steps: (1) placing polyester chemical fiber fabrics in a dyeing solution containing 0.5-1.5 g / L low-temperature refining agent, 0.5-2 g / L chelating dispersant and 2-3 g / L sodium dithionite at a bath ratio of 1:5, keeping the temperature for 10-20 minutes, then heating the temperature to 75-85°C and keeping the temperature for 15-20 minutes, then cooling the temperature to 70°C, soaking in 0.5-1.5 g / L acetic acid aqueous solution for 10-20 minutes, then heating the temperature to 85-95°C and continuing to soak for 10-20 minutes, draining the liquid, washing with water, and completing the oil and impurity removal process; the use of a low-temperature refining agent can effectively remove the oil and impurities at a lower temperature. Remove impurities and oil stains on the fabric surface. Combined with the strong reducing property of sodium dithionite, it can effectively remove oxidative impurities and color stains on the fabric, and improve the purity and brightness of the dyeing; the chelating dispersant can reduce the electrostatic repulsion between the dye molecules and the fabric through chelation, prevent the dye molecules from enriching on the fabric surface, thereby improving the uniformity and permeability of the dyeing; and the use of low-temperature sodium dithionite can also reduce the dyeing temperature, further reducing energy consumption and wastewater discharge; the low temperature state can be carried out at room temperature, and then the temperature is raised to 75-85℃ to improve the decontamination effect; after cooling, it is treated with an acetic acid aqueous solution to remove impurities and oil stains on the fabric surface and improve the purity and dyeability of the fiber.

[0030] (2) Add water to the dye vat, dilute the disperse dye with 1-5g / L dispersant and then add it, control the adding speed, add the time within 30-40 minutes, and stir while adding; the dispersant used in the dye bath is anionic, non-ionic or composite. In this embodiment, polyoxyethylene ether is used, which can be adsorbed on the surface of the dye particles to form a protective film to prevent the aggregation and sedimentation of the dye particles, thereby maintaining the stable dispersion state of the dye in the dye bath, and adjusting the adsorption and diffusion rate of the dye on the fiber to make the dye evenly distributed on the fiber to avoid the generation of color difference and color spots.

[0031] (3) Further, when the bath temperature reaches 60°C, 0.05-0.5g / L hydrogen peroxide is added, and the heating rate is controlled to be lower than 0.8°C / minute to make the dye solution evenly dispersed; when the bath temperature reaches 80°C, 4.5-5.5g / L soda ash is added, and then the heating rate is controlled to be uniformly heated to 130±2°C at a rate of 1-2°C / minute, and kept warm for 30-60 minutes; this process uses hydrogen peroxide and soda ash to further bleach. Hydrogen peroxide is weakly acidic, and the addition of soda ash can neutralize the acidic substances in the dye bath. Polyester fiber has good dyeing performance under alkaline conditions, so that the dye bath is kept in a suitable alkaline environment.

[0032] (4) After keeping warm, cool down to 65-70℃ at 1-2℃ / min, drain, wash with water, and perform reduction cleaning; (5) The process of reduction cleaning is as follows: put the polyester blended fabric into the dyeing solution containing 0.5-5g / L of insurance powder and 0.5-1.5g / L of soap detergent, run for 10-20 minutes, then heat to 80-85℃, keep warm for 10-20 minutes, drain, wash with water, and complete the reduction cleaning process; adding insurance powder such as sodium dithionite, due to its strong reducing property, can effectively remove disperse dyes and other oxidative impurities stained on polyester fibers, thereby improving the purity and color fastness of dyed fabrics; soap detergent is a product of the type of high molecular polymer compound, which can effectively remove floating colors and unfixed dyes on the surface of dyed fabrics, improve the cleanliness and color fastness of dyed fabrics, and has the function of a softener, which can improve the feel and comfort of fabrics while removing floating colors.

[0033] Furthermore, the polyester chemical fiber fabric is placed in a dye solution containing 4-5g / L of dispersant, and the dyed polyester fabric is added, and the temperature is first raised to 60-70°C, then raised to 80°C, and then raised to 130°C, kept warm, and then cooled to 65-70°C at a rate of 1-2°C / min, and the liquid is drained, washed with water, and reduced to complete the dyeing process. In this process, the dispersant is used in an amount of 4-5g / L, which can be adsorbed on the surface of the dye particles to form a protective film to prevent the aggregation and sedimentation of the dye particles, thereby maintaining a stable dispersion state of the dye in the dye bath.

[0034] Furthermore, the reduction cleaning process is: putting the polyester blended fabric into a dye solution containing 4.5-5g / L thiourea dioxide-based insurance powder, first running it for 10-20 minutes, then heating it to 80-85°C, keeping it warm for 10-20 minutes, draining the liquid, washing with water, and completing the reduction cleaning process; it can effectively remove floating colors and unfixed dyes on the surface of dyed fabrics, improve the cleanliness and color fastness of dyed fabrics, and improve the feel and comfort of the fabrics.

[0035] Furthermore, a dispersion liquid is prepared by diluting the disperse dye with a dispersant by 200-250 times; too high a dilution ratio may result in too low a dye concentration and too high a degree of dye dispersion, affecting the dyeing effect; too low a dilution ratio may result in the dye particles being unable to be fully dispersed. In this embodiment, a dilution of 200-250 times is determined to be the preferred dilution ratio.

[0036] 2-4 g / L of penetrant is added to the dye liquor in step (1). The penetrant reduces the surface or interfacial tension, allowing water or other liquids to spread or penetrate on the solid material, thereby improving wettability and permeability. The penetrant is used in the dyeing process to shorten the process time and improve the fabric quality and dyeing uniformity.

[0037] In some embodiments, the dye vat 2 is provided with a liquid collector 3 through a liquid delivery pipeline 1, and low-temperature refining agent, chelating dispersant, low-temperature sodium dithionite, dispersant and insurance powder are prepared into liquid in the liquid collector 3. The liquid collector 3 is a pressure vessel with an internal pressure range of 0.05-0.2MP, and is injected into the dye vat 2 through a pressure pump 7; at the same time, the dye inside the dye vat 2 can be pressed out and injected into the liquid collector 3, and repeatedly injected into the dye vat 2 to improve the dyeing effect.

[0038] Furthermore, an injection head 21 is provided inside the dye vat 2, and the auxiliary liquid is input through the injection head 21. A valve switch 11 is provided on the liquid delivery pipeline 1. A pressure safety valve 31 is provided on the top of the liquid collector 3. A first liquid level meter 4 and a first liquid level meter sensor 5 are provided in the liquid collector 3. The valve switch 11 of the liquid delivery pipeline 1 controls the injection flow of the auxiliary liquid, and also includes an external main controller, which is connected to the pressure safety valve 31, the valve switch 11, and the first liquid level meter sensor 5; the auxiliary liquid in the liquid collector 3 is injected into the dye vat 2 from the injection port 22 through the pressure pump 7, and the main controller realizes the intelligent valve switch 11 to control the injection flow of the auxiliary liquid.

[0039] The master controller integrates data acquisition, processing and decision-making, including a first liquid level meter sensor 5, a pressure sensor, a temperature sensor, a data processing unit, a control algorithm module and a communication interface. The first liquid level meter sensor, flow sensor, temperature sensor and pressure sensor (not shown in the figure) collect flow data and environmental parameters in real time. The data processing unit and the control algorithm module: a built-in intelligent control algorithm predicts future flow demand based on current flow data and historical data, and calculates the optimal valve opening of the valve switch 11; a communication interface: communicates with the valve controller and sends control instructions; according to the prediction results and the preset flow distribution strategy, a control instruction is generated to connect the master controller with the valve controllers of each branch through the network to form a complete intelligent flow control system.

[0040] Furthermore, the dye vat 2 is provided with a second liquid level meter 23 and a second liquid level meter controller 24. The top of the dye vat 2 has an air inlet 25 and an outlet 26. The second liquid level meter 22 and the second liquid level meter controller 23 are used to detect the liquid level height in the dye vat 2 in real time; it also includes a flow sensor, a temperature sensor and a pressure sensor (not shown in the figure), etc.

[0041] For example, if 100L of auxiliary solution is set, the first liquid level meter sensor 5 collects the signal of 100L solution being injected into the dye vat 2 in real time and sends it to the main controller. After calculating that the injection of 100L solution is completed, the main controller sends the closing signal to the valve switch 11 to close it. This can achieve real-time and accurate control of flow and flow rate, and can improve dyeing efficiency and effect.

[0042] In order to further improve the dyeing effect, the auxiliary liquid enters the dye vat 2, and the dye liquid after dyeing is forced out into the liquid collector 3, and then is led out from the liquid collector 3 and injected into the dye vat 2 for repeated multiple immersion dyeing to achieve:

[0043] In the initial stage of the immersion dyeing operation, the fabric to be dyed, the dye and the auxiliary liquid immersed in the liquid are mixed to form an initial dye concentration C1, the dyeing time is 10 minutes, the dye liquid is discharged, and after pickling and washing, the dye is mixed again to form a second dye liquid concentration C2, the dyeing time is 15 minutes, the dye liquid is discharged, and after pickling and washing, the dye is mixed again to form a third dye liquid concentration C3, the dyeing time is 20 minutes, the dye liquid is discharged, and after pickling and washing, the dye is mixed again to form a fourth dye liquid concentration C4, the dyeing time is 30 minutes, the dye liquid is discharged, and after pickling and washing, the dye liquid is finally discharged, wherein the second dye liquid concentration C2 is higher than the initial concentration C1, the third dye liquid concentration C3 is greater than the second dye liquid concentration C2, and the fourth dye liquid concentration C4 is greater than the third dye liquid concentration C3.

[0044] The following are specific examples 1-5 and comparative examples 1-3 for illustration.

[0045] Embodiment 1:

[0046] In this embodiment, the dyed polyester fabric is first dyed at room temperature with a bath ratio of 1:5, 1g / L low-temperature refining agent, 1g / L chelating dispersant and 2.5g / L sodium dithionite (chelating dispersant model JY-10087, low-temperature refining agent model JY-10083, sodium dithionite model JY-10081, from Shaoxing Jiyu Chemical Technology Co., Ltd.), and the disperse dye is 0.3% owf disperse brilliant blue (0.3% owf disperse brilliant blue 2BLN, from Shaoxing Jiyu Chemical Technology Co., Ltd.), and the heat preservation operation is 15 minutes, the temperature is raised to 80°C, the temperature is kept for 15 minutes, and then the temperature is lowered to 70°C, and the fabric is soaked in 1g / L acetic acid aqueous solution for 10 minutes, washed with water, heated to 90°C, and continued to soak for 10 minutes, drained, and washed with water to complete the oil removal and impurity removal process;

[0047] Add water to the dye vat, dilute 0.3% owf Disperse Brilliant Blue 2BLN with 5g / L dispersant and add slowly, control the adding speed, add for 30 minutes, and stir while adding;

[0048] When the bath temperature reaches 60°C, add 0.1g / L hydrogen peroxide and control the heating rate to be lower than 0.8°C / min to make the dye solution evenly dispersed;

[0049] When the bath temperature reaches 80°C, add 5g / L soda ash, then control the heating rate to uniformly increase the temperature to 130°C at 1-2°C / min and keep it warm for 40 minutes;

[0050] After keeping warm, cool down to 70℃ at 1℃ / min, drain, wash with water, and perform reduction cleaning to complete the dyeing process;

[0051] The reduction cleaning process is as follows: put the polyester chemical fiber fabric into the dye solution containing 0.5-5g / L of insurance powder and 1g / L of soap detergent, run for 10 minutes, then heat to 80℃, keep warm for 15 minutes, drain the liquid, wash with water, and complete the reduction cleaning process.

[0052] Example 2

[0053] In this embodiment, what is different from Embodiment 1 is that during the reduction cleaning process: the polyester blended fabric is placed in a dye solution containing 4.5 g / L thiourea dioxide-based insurance powder, first operated for 15 minutes, then heated to 80°C, kept warm for 15 minutes, drained, washed with water, and the reduction cleaning process is completed.

[0054] Example 3

[0055] In this embodiment, what is different from Embodiment 2 is that in the process of preparing the dispersion liquid, the disperse dye is diluted 240 times with the dispersant.

[0056] Example 4

[0057] In this embodiment, the difference from Embodiment 3 is that 3 g / L of penetrant is added to the dye solution in step (1).

[0058] Example 5

[0059] In this embodiment, the dyeing auxiliary agent, dyeing time, temperature and other conditions are the same as those in Example 4, except that the polyester fabric to be dyed is repeatedly dip-dyed multiple times:

[0060] In the initial stage, the polyester fabric to be dyed, the disperse dye 0.3% owf Disperse Brilliant Blue 2BLN, and the auxiliary liquid (the auxiliary in Example 4) are mixed and put into the dye vat 2 to form an initial dye concentration C1, and the dye liquor is discharged from the outlet 26 of the dye vat 2 into the liquid collector 3. After dyeing, the polyester fabric is soaked in a 1g / L acetic acid aqueous solution for 10 minutes, and then washed with water. After washing, the second dye liquor concentration C2 mixed dye formed by the liquid collector 3 is injected into the dye vat 2 through the pressure pump 7. The dyeing time is 15 minutes. The dye liquor is discharged in the same way. After acid washing and washing, , the third dye liquor concentration C3 mixed dye formed by the liquid collector 3 is injected into the dye vat 2 through the pressure pump 7 again, the dyeing time is 20 minutes, the dye liquor is discharged, and after acid washing and water washing, the fourth dye liquor concentration C4 mixed dye formed by the liquid collector 3 is injected into the dye vat 2 through the pressure pump 7, the dyeing time is 30 minutes, and finally the dye liquor is discharged. After the dyed polyester fabric is acid washed and water washed; wherein, the second dye liquor concentration C2 is higher than the initial concentration C1, the third dye liquor concentration C3 is greater than the second dye liquor concentration C2, and the fourth dye liquor concentration C4 is greater than the third dye liquor concentration C3.

[0061] Comparative Examples 1-3

[0062] The experimental process and results of Example 1 and Comparative Examples 1-3 of the present invention are as follows:

[0063] The process of Comparative Example 1 is basically the same as that of Example 1, except that this comparative example does not contain low-temperature refining agent, chelating dispersant, sodium dithionite, acetic acid water, hydrogen peroxide and soda ash.

[0064] The process of Comparative Example 2 is substantially the same as that of Example 1, except that acetic acid water, hydrogen peroxide and soda ash are not contained in this comparative example.

[0065] The process of Comparative Example 3 is substantially the same as that of Example 1, except that hydrogen peroxide and soda ash are not contained in this comparative example.

[0066] Performance Test 1: According to the dyeing process described in Examples 1-5 and Comparative Examples 1-3, 20 pieces of the same dyed fabrics were dyed, dried, and then compared with the color chart. The fabrics were scored according to the degree of color brightness, with excellent, good, medium, and poor scores. The excellent score was above 80 points, the good score was above 70-79 points, the medium score was above 60-69 points, and the poor score was below 59 points. The average calculation results are shown in the following table.

[0067] Performance Test 2: According to the dyeing process described in Examples 1-5 and Comparative Examples 1-3, 20 pieces of the same dyed fabrics were dyed and dried, and the dyeing uniformity was visually inspected. The dyeing uniformity was scored in four grades: excellent, good, medium, and poor. The excellent score was above 80 points, the good score was above 70-79 points, the medium score was above 60-69 points, and the poor score was below 59 points. The average calculation results are shown in the following table.

[0068]

[0069] in conclusion:

[0070] Compared with Comparative Example 1, Example 1 of the present invention adds a low-temperature refining agent, a chelating dispersant, sodium dithionite, acetic acid water, hydrogen peroxide and soda ash to remove stained stains and surface impurities, and significantly improves the dyeing rate and uniformity of the fabric. Acetic acid water can control the pH value, avoid uneven dyeing of the fabric, and improve the dyeing rate. Hydrogen peroxide and soda ash are used in combination for further bleaching. Hydrogen peroxide is weakly acidic, and the addition of soda ash can neutralize the acidic substances in the dye bath. The polyester fiber has good dyeing property under alkaline conditions.

[0071] Compared with Comparative Example 2, Example 1 adds acetic acid water, hydrogen peroxide and soda ash. Acetic acid water can control the pH value, avoid uneven dyeing of the fabric, and improve the dyeing rate. Hydrogen peroxide and soda ash are used in combination for further bleaching. Hydrogen peroxide is weakly acidic, and the addition of soda ash can neutralize the acidic substances in the dye bath. The polyester fiber has good dyeing properties under alkaline conditions.

[0072] Compared with Comparative Example 3, Example 1 uses hydrogen peroxide and soda ash for further bleaching. Hydrogen peroxide is weakly acidic, and the addition of soda ash can neutralize the acidic substances in the dye bath. The polyester fiber has better dyeability under alkaline conditions.

[0073] Compared with Example 1, Example 2 of the present invention adds thiourea dioxide-based insurance powder during the reduction cleaning process to further remove stains and surface impurities, thereby improving the dyeing rate and color fastness of the fabric; Compared with Example 2, Example 3 of the present invention dilutes the disperse dye with a dispersant by 240 times, which can form a protective film on the surface of the dye particles to prevent the aggregation and sedimentation of the dye particles, thereby maintaining a stable dispersion state of the dye in the dye bath; Compared with Example 3, Example 4 of the present invention adds a penetrant to make the fabric evenly penetrated to achieve the effect of efficient and even dyeing; Compared with Example 4, Example 5 of the present invention repeatedly performs multiple immersion dyeing on the fabric to be dyed, thereby significantly improving the dyeing effect and dyeing uniformity.

Claims

1. A one-bath dyeing method for polyester blended fabrics, characterized in that The method comprises the following steps: (1) placing polyester chemical fiber fabric in a dyeing solution containing 0.5-1.5 g / L low-temperature refining agent, 0.5-2 g / L chelating dispersant and 2-3 g / L sodium dithionite at a bath ratio of 1:5, keeping the temperature for 10-20 minutes, heating the temperature to 75-85°C and keeping the temperature for 15-20 minutes, then cooling the temperature to 70°C, soaking the fabric in a 0.5-1.5 g / L acetic acid aqueous solution for 10-20 minutes, heating the fabric to 85-95°C and continuing to soak the fabric for 10-20 minutes, draining the fabric, washing the fabric with water, and completing the oil and impurity removal process; (2) adding water into the dyeing vat, diluting the disperse dye with 1-5 g / L dispersant and then adding the disperse dye, controlling the adding speed, adding the dye for 30-40 minutes, and stirring the dye while adding the dye; (3) when the bath is heated to 100 °C, the dyeing solution is dried and the dye is washed with water, ... When the temperature reaches 60°C, add 0.05-0.5g / L hydrogen peroxide, and control the heating rate to be lower than 0.8°C / min to make the dye solution evenly dispersed; when the bath temperature reaches 80°C, add 4.5-5.5g / L soda ash, and then control the heating rate to uniformly heat to 130±2°C at 1-2°C / min, and keep warm for 30-60 minutes; (4) After keeping warm, cool to 65-70°C at 1-2°C / min, drain, wash with water, and perform reduction cleaning to complete the dyeing process; (5) The reduction cleaning process is as follows: put the polyester blended fabric into the dye solution containing 0.5-1.5g / L soap detergent, run for 10-20 minutes, then heat to 80-85°C, keep warm for 10-20 minutes, drain, wash with water, and complete the reduction cleaning process.

2. The one-bath dyeing method for polyester blended fabric according to claim 1, characterized in that: Put the polyester chemical fiber fabric into the dye solution containing 4-5g / L dispersant, add the dyed polyester fabric, first heat it to 60-70℃, then heat it to 80℃, then heat it to 130℃, keep it warm, then cool it down to 65-70℃ at 1-2℃ / min, drain the liquid, wash it with water, and perform reduction cleaning to complete the dyeing process.

3. A one-bath dyeing method for polyester blended fabrics according to claim 2, characterized in that: The reduction cleaning process is as follows: putting the polyester blended fabric into a dye solution containing 4.5-5g / L thiourea dioxide-based hydrosulfur powder, running it for 10-20 minutes, then heating it to 80-85°C, keeping it warm for 10-20 minutes, draining the liquid, washing with water, and completing the reduction cleaning process.

4. The one-bath dyeing method for polyester blended fabric according to claim 2, characterized in that: During the preparation of the dispersion, the disperse dye is diluted 200-250 times with the dispersant.

5. A one-bath dyeing method for polyester blended fabrics according to claim 4, characterized in that: Add 2-4 g / L of penetrant to the dye solution in step (1).

6. A one-bath dyeing method for polyester blended fabrics according to any one of claims 1 to 5, characterized in that: It includes a dye vat and a liquid collector which are connected through a liquid delivery pipeline. An injection head is arranged inside the dye vat, and auxiliary liquid is input through the injection head. A valve switch is arranged on the liquid delivery pipeline. A pressure safety valve is arranged on the top of the liquid collector. A first liquid level meter and a first liquid level meter sensor are arranged on the liquid collector. The valve switch of the liquid delivery pipeline controls the injection flow of the auxiliary liquid. It also includes an external main controller, and the main controller is connected to the pressure safety valve, the valve switch, and the first liquid level meter sensor.

7. A one-bath dyeing method for polyester blended fabrics according to claim 6, characterized in that: The auxiliary liquid of the liquid collector is injected into the dyeing vat from the injection port through a pressure pump. The dyeing vat is provided with a second liquid level meter and a second liquid level meter controller. The top of the dyeing vat is provided with an air inlet and an outlet. The second liquid level meter and the second liquid level meter controller are used to detect the liquid level height in the dyeing vat in real time.

8. A one-bath dyeing method for polyester blended fabrics according to claim 7, characterized in that: The auxiliary liquid enters the dye vat for dyeing, and the dye liquid is pressed out into the liquid collector after being dyed. Then, it is led out from the liquid collector and injected into the dye vat for repeated immersion dyeing.

9. A one-bath dyeing method for polyester blended fabrics according to claim 8, characterized in that: In the initial stage of the immersion dyeing operation, the fabric to be dyed, the dye and the auxiliary liquid immersed in the liquid are mixed to form an initial dye concentration C1, the dyeing time is 10 minutes, the dye liquid is discharged, and after acid washing, the dye is mixed again to form a second dye liquid concentration C2, the dyeing time is 15 minutes, the dye liquid is discharged, after the initial water washing, the dye is mixed again to form a third dye liquid concentration C3, the dyeing time is 20 minutes, the dye liquid is discharged, after soap washing, the dye is mixed again to form a fourth dye liquid concentration C4, the dyeing time is 30 minutes, the dye liquid is discharged, and after water washing, the dye liquid is discharged.

10. A one-bath dyeing method for polyester blended fabrics according to claim 8, characterized in that: The second dye solution concentration C2 is higher than the initial concentration C1, the third dye solution concentration C3 is greater than the second dye solution concentration C2, and the fourth dye solution concentration C4 is greater than the third dye solution concentration C3.

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