Polyester trademark woven tape liquid disperse dye dyeing process

Abstract

The invention relates to a liquid disperse dye dyeing process for a polyester trademark braid, and belongs to the technical field of textile printing and dyeing. The dyeing process provided by the invention comprises the steps of pretreatment, dye liquor preparation, dyeing, fixation treatment and post-treatment, and the dyeing temperature, dye liquor concentration and time and addition of auxiliaries are controlled through specific process parameters and operation procedures, so that the dyeing uniformity and color fastness of the polyester trademark braid are remarkably improved; meanwhile, the utilization rate of the dye and the quality of a dyed finished product are improved, emission of the dye in the dyeing process is reduced, and pollution to the environment is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of textile printing and dyeing, and in particular to a liquid disperse dye dyeing process for a polyester trademark ribbon. Background Art

[0002] Polyester fiber has the advantages of high strength, good wear resistance, and good elastic recovery. It is widely used in the fields of trademark webbing, clothing, and home textile products. Polyester trademark webbing is widely used in the clothing, luggage and other industries. It is a kind of identification material widely used in clothing, luggage, shoes and other products. As an accessory of clothing, luggage and other products, the appearance and quality of polyester trademark webbing directly affect the overall product image and market competitiveness. However, in the traditional polyester trademark webbing dyeing process, disperse dye powder is mainly used for dyeing, and high temperature and high pressure dyeing methods are used. The utilization rate of dyes in the dyeing process is low, the dyeing uniformity is poor, and the color fastness after dyeing is not high, and it is easy to fade. In addition, the dyes used in traditional processes contain a large amount of harmful chemicals, causing serious environmental pollution.

[0003] With the continuous improvement of environmental protection requirements and the continuous development of dyeing technology, in order to solve the above problems, the liquid disperse dye dyeing process has gradually attracted attention in recent years. Liquid disperse dyes have the advantages of good solubility, uniform dyeing, high color fastness, and low environmental pollution, and are suitable for the dyeing of polyester trademark ribbons. However, the liquid disperse dye dyeing process in the prior art still has certain limitations for the application of trademark ribbons, such as the dyeing uniformity is still poor during the dyeing process, and the color effect of the trademark ribbon is difficult to maintain stability for a long time. Therefore, an improved dyeing process is urgently needed to solve the deficiencies in the prior art, and the development of an efficient and environmentally friendly polyester trademark ribbon dyeing process has a huge market. Summary of the invention

[0004] The purpose of the present invention is to provide a polyester trademark ribbon liquid disperse dye dyeing process, which includes five main steps of pretreatment, dye preparation, dyeing, color fixation treatment and post-treatment. By reasonably selecting process parameters and operation procedures, high-quality dyeing of polyester trademark ribbons can be achieved. A polyester trademark ribbon liquid disperse dye dyeing process provided by the present invention achieves efficient and uniform dyeing effects by optimizing key parameters and conditions in the dyeing process, while improving the utilization rate of the dye and the quality of the dyed finished product. By optimizing process parameters such as dyeing temperature, dye solution concentration, and time, the uniformity and color fastness of dyeing are improved, and pollution to the environment is reduced to solve the problems existing in the traditional disperse dye powder dyeing process. The process is suitable for large-scale production, and has the advantages of simple operation, uniform dyeing, and high dye utilization, and has broad application prospects and market value.

[0005] A polyester label ribbon liquid disperse dye dyeing process, comprising the following steps: S1 Pretreatment: Degreasing and refining the polyester trademark webbing, cleaning the polyester trademark webbing, removing the oil and impurities on the surface, and ensuring that the webbing surface is clean and undamaged.

[0006] Degreasing and scouring are the basic steps of the dyeing process, which aims to remove oil and impurities on the surface of the fabric, improve the wettability of the ribbon and the uniformity of subsequent dyeing. This process can not only improve the adhesion of the dye, but also prevent spots and uneven dyeing in the subsequent dyeing process. Cleaning ensures that there is no residual material on the ribbon before dyeing, ensuring the uniformity and stability of the dyeing effect.

[0007] Preparation of S2 dye solution: select liquid disperse dye with a dosage of 1-5% of the weight of the fabric, use acetic acid-sodium acetate as a buffer and add deionized water to prepare a solvent with a pH value of 4.5-5.5, slowly add the dye to the solvent and add a dispersant with a mass concentration of 10-30% of the liquid disperse dye and stir evenly. The stirring time is 10-20 minutes, and stirring is continued for 30-60 minutes after heating.

[0008] Liquid disperse dyes provide good solubility, dyeing performance and color fastness, avoiding the problem of traditional solid dyes being difficult to disperse and dissolve. Deionized water is better than hard water, which contains more impurities and more calcium and magnesium ions, affecting the dispersion and precipitation of dyes, as well as the pH stability and the effect of auxiliaries. pH control is crucial in the dyeing process, helping to prevent excessive or insufficient absorption of dyes, thereby maintaining color consistency. The addition of dispersants can improve the dispersion and uniformity of dyes, ensure that the dyes penetrate the fibers evenly during the dyeing process, and reduce uneven dyeing.

[0009] S3 dyeing: immerse the pretreated polyester trademark ribbon into the prepared dye solution, the weight ratio of the ribbon to the dye solution is 1-5:99-95, and dyeing is carried out in a high temperature and high pressure dyeing machine, the dyeing temperature is 120-135℃, the dyeing time is 45-70 minutes, the dyeing pressure is 0.3-0.5MPa, and the pH value is controlled at 5-6; the segmented dyeing method is adopted, and the penetrant, defoamer and anti-precipitant are added step by step during the dyeing process, and the temperature, heating rate, stirring speed and time of each section are controlled.

[0010] The high temperature and high pressure dyeing machine ensures that the dye can evenly penetrate into the webbing fiber under high temperature and high pressure environment. High temperature and high pressure dyeing effectively improves the adhesion and permeability of the dye, allowing the dye to penetrate deeply into the polyester fiber, which makes the dyed trademark webbing uniform in color and bright in color, and can obtain a higher dyeing depth, which can meet the production needs of trademark webbing with higher color requirements. Because the dye can fully combine with the fiber, the dyed trademark webbing performs well in terms of wash fastness, friction fastness and light fastness. After multiple washings, the color is not easy to fade; during the friction process, it is not easy to fade, which can maintain the color stability of the trademark webbing.

[0011] The dyeing temperature of polyester trademark ribbon is between 125-130℃. In this temperature range, the molecular chain movement of polyester fiber intensifies, and the amorphous area of ​​the fiber will produce more gaps, which is conducive to the entry of dye molecules, thereby increasing the dye uptake rate. At the same time, the dispersant can also maintain good dispersing properties at this temperature, ensuring that the dye is evenly dispersed and preventing the dye from aggregating and affecting the dyeing effect. When the temperature is lower than 125℃, the dye uptake speed will be very slow, resulting in a long dyeing time and insufficient dyeing depth; when the temperature is higher than 130℃, it will cause the dispersant to decompose and lose its dispersing effect, and the dye will also undergo adverse reactions such as hydrolysis, which will reduce the dyeing quality.

[0012] In the dyeing process of polyester trademark ribbons, the pH value of the dye liquor where the liquid disperse dye is located is crucial to the dyeing effect. Buffers can maintain the pH value of the dye liquor within a relatively stable range. Polyester fibers have better dyeing effects under acidic conditions, and the commonly used acetic acid-sodium acetate buffer system can stabilize the pH value between 4.5-5.5. When the pH value of the dye liquor changes due to chemical reactions or the introduction of impurities, the buffer can offset the effects of these changes through its own acid-base balance regulation, ensuring that the dye is dyed under a suitable pH environment. A stable pH value helps to ensure consistency in the effect of each dyeing. Different pH values ​​may cause changes in the dye's color uptake, color shade, etc. The use of buffers can enable the dye to work under the same pH conditions, thereby making the color reproducibility of polyester trademark ribbons better, and whether in the same batch or different batches of dyeing production, stable and uniform products can be obtained.

[0013] Penetrants are generally compounds with an amphiphilic structure, containing both hydrophilic and lipophilic groups. During the dyeing process, they can reduce the surface tension between the liquid disperse dye and the polyester trademark ribbon. Fatty alcohol polyoxyethylene ether penetrants, the polyoxyethylene chain in its molecule is hydrophilic, and the fatty alcohol part is lipophilic. This structure enables the penetrant to act as a bridge between the liquid and the surface of the ribbon fiber, reducing the interfacial resistance between the two, making it easier for the dye to penetrate into the interior of the ribbon fiber. For polyester trademark ribbons with a relatively tight structure, the role of the penetrant is particularly important. It can help the dye quickly and evenly penetrate into all parts of the fiber, avoiding the situation where the surface is darkly dyed, the interior is lightly dyed, or the dyeing is uneven. This helps to improve the dyeing quality and make the ribbon color more full and uniform, especially when dyeing dark colors or requiring high color uniformity, the penetrant is an indispensable auxiliary agent.

[0014] During the dyeing process, the liquid disperse dye solution will produce foam due to factors such as stirring, the addition of additives or other chemical reactions. Defoamers can quickly reduce the surface tension of the foam and cause it to burst. Silicone defoamers can quickly spread on the foam surface, replace the liquid in the foam film, make the foam film thinner, and eventually cause the foam to burst. Excessive foam will affect the dyeing process, such as interfering with the uniform distribution of the dye and reducing the effective volume of the dyeing equipment. Timely elimination of foam can ensure the normal progress of the dyeing process and improve production efficiency. If the foam is not handled in time, it will cause the dye to overflow the dyeing equipment, causing waste and environmental pollution. In addition, the presence of foam will prevent the ribbon from fully contacting the dye during the dyeing process, affecting the dyeing quality, and causing problems such as uneven dyeing and color flowers. The use of defoamers can effectively avoid these situations and ensure the smooth dyeing of polyester trademark ribbons.

[0015] During the storage process of liquid disperse dyes, precipitation will occur due to the interaction between dye particles. Anti-precipitation agents can adsorb on the surface of dye particles or increase the viscosity of the liquid to prevent dye precipitation. As an anti-precipitation agent, polyethylene glycol can increase the viscosity of the liquid and slow down the sedimentation rate of dye particles due to its long chain structure. At the same time, it can also wrap the dye particles through physical adsorption, so that they keep a certain distance from each other to avoid agglomeration and precipitation. Preventing dye precipitation is also very important to ensure the uniformity of dyeing. When the dye precipitates during storage, it will cause uneven dye concentration in the dye liquor when used, which will affect the dyeing effect and make the polyester trademark ribbon appear in different shades. Anti-precipitation agents can ensure that the dye is always evenly dispersed during storage and use, which is conducive to obtaining high-quality, uniformly colored dyed ribbons.

[0016] S4 color fixing treatment: Take the dyed ribbon out of the high temperature and high pressure dyeing machine and put it into a solution containing 1-3g / L color fixing agent for color fixing treatment. After treatment at 60℃-80℃ for 20-30 minutes, heat treat the ribbon at 170-180℃ for 20-30 minutes. After the treatment, rinse with clean water and cool to room temperature.

[0017] Color fixation is a key step in the dyeing process. Through chemical fixing agents and heat treatment, the color fastness and washability of fabrics can be effectively improved, and the risk of dye fading can be reduced. The amount of fixing agent and the treatment time directly affect the color fastness. Too much or too little fixing agent will lead to unsatisfactory color fixation effect, so it is very important to reasonably control the amount and time.

[0018] S5 post-treatment: wash, soap, dry and finish the polyester trademark ribbon after color fixation, the washing temperature is 40-60℃, the washing times are 2-5 times, the washed ribbon is put into soap detergent solution for soaping, the amount of soap detergent is 1-3g / L, the treatment temperature is 80-90℃, the treatment time is 10-20 minutes, the washed ribbon is dried by drying, the temperature is controlled at 30-60℃, the time is 30-50 minutes, the dried ribbon is finished, and wrinkles and uneven parts are removed by ironing or stretching to obtain a dyed polyester trademark ribbon.

[0019] The dyed ribbon needs to be thoroughly cleaned to remove the residual dye and dispersant. If the cleaning is not thorough, the residual substances will affect the color fastness and feel of the ribbon. During the cleaning process, it is necessary to choose the appropriate cleaning agent and cleaning process to ensure the cleaning effect. The temperature and time during the drying process must also be controlled. If the temperature is too high or the time is too long, the ribbon will change color, deform or shrink; if the temperature is too low or the time is too short, the moisture in the ribbon cannot be completely removed, which is easy to breed bacteria.

[0020] The present invention provides a polyester trademark ribbon liquid disperse dyeing process, which combines pretreatment, dye preparation, dyeing, color fixation and post-treatment in five steps to form a systematic environmentally friendly dyeing process. By reasonably controlling the temperature, time and dosage parameters of each link, not only the uniformity and color fastness of dyeing are improved, but also the impact on the environment is effectively reduced.

[0021] Preferably, the step S1 pre-processing specifically comprises the following steps: S11 Degreasing: Place the polyester trademark ribbon in a solution containing 1-3g / L of degreasing agent, treat it at 40-60℃ for 20-30 minutes, and remove grease and impurities on the ribbon surface by stirring; S12 Scouring: After degreasing, place the ribbon in a solution containing 2-5g / L of scouring agent and treat it at 80-90℃ for 30-40 minutes to further remove residual impurities on the ribbon; S13 Cleaning: After scouring, wash with clean water to room temperature to ensure that the surface of the ribbon is clean.

[0022] According to the material and oil stain of polyester trademark ribbon, choose the appropriate degreasing agent and scouring agent. The degreasing agent should have good degreasing effect and emulsification performance, and the scouring agent should have good scouring effect and wettability. Degreasing and scouring treatment, through the reasonable selection of degreasing agent and scouring agent and their dosage, temperature and time parameters, effectively remove oil stains and impurities, and improve the wettability and dyeing performance of the ribbon.

[0023] Preferably, the dye solution preparation in step S2 specifically comprises the following steps: S21 Dye selection: According to the color requirements and dyeing depth of the ribbon, select environmentally friendly liquid disperse dyes, the dosage is 1-5% of the fabric weight; S22: preparing the solvent: adding acetic acid-sodium acetate as a buffer into deionized water, mixing evenly and using it as a solvent for the dye, so that the pH value of the dye solution is 4.5-5.5; S23 Stirring the dye solution: slowly add the dye into the solvent, add the dispersant and stir evenly to ensure that the dye is fully dissolved. The temperature rises to 55-60°C within 10-20 minutes, and the heating rate is 1.5-3.0°C / minute. Maintain 55-60°C and continue stirring for 30-60 minutes. The stirring speed is controlled at 400-600 rpm.

[0024] According to the required dyeing effect and color requirements, select liquid disperse dyes with stable quality and high color fastness. According to the weight of the ribbon, the color depth requirements and the concentration of the dye, calculate the required amount of dye, and the mass of the liquid disperse dye used is 15-30 parts.

[0025] Lignin sulfonate is a natural high molecular polymer. It is used as a dispersant mainly by using the sulfonic acid group on its molecule. The sulfonic acid group makes lignin sulfonate hydrophilic and can be adsorbed on the surface of dye particles. In the liquid disperse dye system, lignin sulfonate molecules are adsorbed on the dye particles, so that the dye particles carry the same negative charge. Due to the charge repulsion, it is difficult for the dye particles to aggregate, thus maintaining a good dispersion state. Moreover, lignin sulfonate has a wide range of sources and relatively low costs. Lignin sulfonate can quickly disperse the dye in the dye solution, evenly disperse the dye, keep the dye particles in a stable suspended state in the dye solution, make it easier for the dye to penetrate into the ribbon fiber, and prevent the aggregation and precipitation of the dye particles, so that the dyeing time can be shortened and the production efficiency can be improved. This helps the dye to fully contact with the polyester trademark ribbon and improve the uniformity and depth of dyeing. In actual production, the use of lignin sulfonate as a dispersant can speed up the dyeing process, reduce energy consumption and production cycle. During the dyeing process, even if the concentration of the dye is high, lignin sulfonate can ensure that the dye is evenly dispersed to avoid the situation where the local dyeing is too dark or too light. Lignin sulfonate can promote the adsorption and fixation of dye molecules on the ribbon, increase the binding force between the dye and the ribbon fiber, thereby improving the utilization rate of the dye and the dyeing effect, improving the color strength of the dye, and making the dyed ribbon color more vivid and bright. In the dyeing process of polyester trademark ribbon, it is necessary to dye at a certain temperature to improve the dye uptake and fixation rate of the dye. Lignin sulfonate has good thermal stability and can still maintain good dispersion properties under high temperature conditions, and will not lose its dispersion effect due to temperature increase. Lignin sulfonate is a natural polymer with a wide range of sources and is renewable. It is biodegradable and environmentally friendly, meeting the environmental protection requirements of the modern textile industry. During use, no harmful substances are produced, and the impact on the health of operators and the environment is small. Lignin sulfonate has good compatibility with the auxiliaries added in the dyeing process of polyester trademark ribbon, and can work synergistically to jointly improve the effect of the dyeing process.

[0026] Preferably, the dispersant is lignin sulfonate, and its usage is 10-30% of the mass of the disperse dye.

[0027] The dosage of lignin sulfonate is 10-30% of the dye mass. The specific dosage needs to be adjusted according to factors such as the type and concentration of the dye, the material and thickness of the ribbon, etc. When the dosage is less than 10%, the dye cannot be effectively dispersed, resulting in aggregation of dye particles and uneven dyeing. After dyeing, spots or spots will appear on the surface of the ribbon. When the dosage exceeds 30%, the viscosity of the dye solution will increase significantly, affecting the diffusion and penetration of the dye, which will also lead to uneven dyeing, and more dispersant will remain on the ribbon, affecting the feel of the ribbon and subsequent processing performance.

[0028] Liquid disperse dye and dispersant are slowly added to the solution, stirring while adding, and the stirring speed is controlled at 400-600 rpm. This can make the dye particles in a good dispersed state from the beginning under the action of the dispersant, preventing the dye particles from agglomerating.

[0029] The pH value of the dye solution is controlled between 4.5 and 5.5. Within this pH range, the acidic functional groups such as the carboxyl and sulfonic acid groups of the dispersant lignin sulfonate can maintain a good ionization state, which is conducive to its dispersion effect. At the same time, for many commonly used polyester dyes, this pH value is also conducive to dyeing and fixation of the dye. When the pH value is lower than 4.5, the acidity is too strong, which will cause certain damage to the fibers of the polyester trademark ribbon, reduce the fiber strength and deteriorate the feel. Moreover, an overly acidic environment will also cause structural changes in lignin sulfonate and reduce its dispersion performance. When the pH value is higher than 5.5, the dispersing effect of lignin sulfonate will gradually weaken, and the dye uptake rate will also decrease, resulting in problems such as insufficient dyeing depth and poor color fastness.

[0030] Preferably, the buffer is an acetic acid-sodium acetate buffer system, the amount of acetic acid is 0.5-2g / L, the amount of sodium acetate is 1-3g / L, and the calculated amount of buffer components is first stirred and dissolved in 3-5 times 40-50°C deionized water to ensure complete dissolution, and then added to the water prepared for dissolving the dye to prepare a solvent.

[0031] The acetic acid-sodium acetate buffer system is used to adjust the pH value of liquid disperse dyes. In the polyester dyeing process, the appropriate pH range is very important. Acetic acid is a weak acid and sodium acetate is its corresponding salt. They can buffer according to the changes in the hydrogen ion concentration in the solution. When a small amount of acid or base is added to the solution, acetic acid and sodium acetate will react to keep the pH value of the solution relatively stable. This ensures that the dye is dyed in a suitable acidic environment, which is conducive to the combination of the dye and polyester fiber. During the addition process, continuous stirring is required to evenly disperse the buffer in the water, and then the liquid disperse dye is added for chemical processing. This ensures that the buffer is evenly distributed throughout the dye solution, thereby effectively playing its role in stabilizing the pH value.

[0032] When starting the dyeing equipment, the ribbon should be fully immersed and circulated in the dye solution to ensure that the dye evenly penetrates into the ribbon fiber. During the dyeing process, the heating speed, heat preservation time and cooling speed of the dyeing machine should be controlled according to the properties of the dye and the material of the ribbon to ensure the uniformity and stability of the dyeing effect. Stir continuously during the dyeing process to ensure uniform dyeing.

[0033] Preferably, the dyeing in step S3 adopts a segmented dyeing method, which specifically includes the following steps: S31 The first stage of dyeing: immerse the pretreated polyester trademark webbing in the prepared dye solution at a weight ratio of 1:99-5:95, and dye it in a high temperature and high pressure dyeing machine; add the penetrant fatty alcohol polyoxyethylene ether in an amount of 0.5-3g / L, dilute it with 2-5 times deionized water, and slowly add it to the dye solution under stirring. The speed of the stirring device is controlled at 30-40 revolutions per minute, the pH value is controlled at 5.0-5.5, the heating rate is 5-6℃ / minute within 10-15 minutes until the dyeing temperature is controlled at 120-125℃, and the dyeing time is 30-45 minutes.

[0034] Fatty alcohol polyoxyethylene ether is a commonly used penetrant. Its molecular structure contains hydrophilic polyoxyethylene chains and lipophilic fatty alcohol chains. This amphoteric structure enables fatty alcohol polyoxyethylene ether to reduce the surface tension between the liquid and the polyester trademark ribbon. When dyeing, it helps the dye to penetrate into the ribbon fiber more easily, making the dyeing more uniform. In the case of a relatively tight ribbon structure, fatty alcohol polyoxyethylene ether can effectively help the dye pass through the fiber gaps and improve the dyeing effect.

[0035] The temperature of 120-125℃ can make the dye molecules have sufficient activity and quickly penetrate into the ribbon fibers without causing excessive damage to the physical properties of the ribbon. The speed of 30-40 revolutions per minute can make the dye solution flow fully to avoid dye precipitation without causing excessive mechanical damage to the ribbon. The dyeing time of 30-45 minutes can ensure that the dye fully penetrates into the ribbon fibers and achieves the required dyeing depth. In the pH range of 5.0-5.5, the dye has good stability and can ensure the consistency of the dyeing effect.

[0036] S32 second stage dyeing: add 0.1-0.5g / L of silicone defoamer according to the foam generation situation, dilute the defoamer with 5-10 times deionized water, and slowly add it to the area with more foam. The stirring speed is controlled at 20-30 revolutions per minute, the pH value is controlled at 5.0-5.5, the dyeing temperature is controlled at 125-130℃, the heating rate is 0.3-0.5℃ / minute, and the dyeing time is 10-15 minutes.

[0037] Defoamers are added promptly after foam is generated. When foam is found in the dye liquor, dilute the defoamer with a small amount of water, the dilution ratio is 5-10 times, and then slowly add it to the area with more foam. During the addition process, avoid vigorous stirring, as this will make the foam worse. The defoamer quickly diffuses on the surface of the dye liquor and in the foam layer to play a defoaming role. If foam continues to be generated, it is necessary to add defoamers multiple times, but be careful to avoid excessive use, which will cause the surface tension of the dye liquor to be too low, affecting the dyeing effect.

[0038] S33 third stage dyeing: anti-precipitation agent is added in the final stage of liquid disperse dye production, the dosage of anti-precipitation agent polyethylene glycol is 1-5g / L, the pH value is controlled at 5.0-5.5 during the dyeing process, the dyeing temperature is controlled at 130-135℃, the heating rate is 0.08-0.2℃ / min, the stirring speed is controlled at a medium-low speed of 15-25 revolutions per minute, and the stirring is continued for 5-10 minutes.

[0039] Polyethylene glycol is a high molecular compound used as an anti-precipitation agent in liquid disperse dyes. Its long chain structure can increase the viscosity of the liquid and slow down the sedimentation rate of dye particles. At the same time, it can be adsorbed on the surface of dye particles to further prevent the aggregation and precipitation of dye particles. This is very important for the long-term storage and stable use of liquid disperse dyes, ensuring that the dye components are evenly distributed during use.

[0040] Anti-precipitants are added in the final stage of liquid disperse dye production, and their dosage depends on factors such as the concentration, particle size, and storage conditions of the liquid disperse dye. After the dye has been fully dissolved and filtered, the anti-precipitant is slowly added to the dye solution and stirred thoroughly. The stirring speed is controlled at a medium-low speed of 200-400 rpm, and the continuous stirring time is 15-30 minutes. It should not be too fast to avoid excessive foaming, so as to ensure that the anti-precipitant is evenly dispersed in the dye solution to form a stable anti-precipitation system.

[0041] Preferably, the color fixing treatment in step S4 specifically comprises the following steps: S41 chemical additive: put the dyed ribbon into a solution containing 1-3g / L of color fixing agent, control the temperature at 60-80℃, process for 20-30 minutes, and add a color fixing agent in an amount of 10-20% of the dye amount; S42 heat treatment: heat treatment of the ribbon for initial color fixation at a temperature of 170-180°C for 20-30 minutes; S43 Cooling: Rinse the fixed ribbon with clean water until the temperature reaches room temperature.

[0042] The color fixing agent can improve the color fastness of the dye and prevent the dye from fading during use. According to the color requirements and color fastness requirements of the ribbon, select the appropriate color fixing agent. The color fixing agent should have good color fixing effect and washing resistance. Heat treatment can improve the color fastness of the dye. Through the appropriate amount of color fixing agent and color fixing process, the color fastness of the ribbon is improved, and its washing resistance and friction resistance are greatly enhanced.

[0043] Preferably, the post-processing in step S5 specifically comprises the following steps: S51 water cleaning: After the color fixation is completed, the ribbon is placed in clean water for cleaning. The water temperature is controlled at 40-60℃. The cleaning frequency is 2-5 times to remove the residual dyes and chemical additives on the surface of the ribbon. S52 Soaping: After washing, the ribbon is placed in a soaping agent solution for 10-20 minutes. The amount of soaping agent is 1-3g / L, and the temperature is 80-90℃ to remove unfixed dyes and residues. S53 Drying: Dry the cleaned ribbon at a temperature of 30-60°C for 30-50 minutes; S54 Finishing: Flatten the dried ribbon by ironing or stretching to remove wrinkles and uneven parts.

[0044] Washing and soaping can effectively remove residual substances and unfixed dyes from the dyeing process, preventing fading and dye transfer during use. Drying and finishing ensure that the ribbon remains flat and stable in shape, ensuring the appearance quality of the final product.

[0045] Preferably, the dye used for the polyester trademark ribbon includes: a Disperse dyes: 15-30 parts of azo disperse dyes or anthraquinone disperse dyes, or azo disperse dyes and anthraquinone disperse dyes mixed dyes; b Dispersant: The dosage of lignin sulfonate is 10-30% of the mass of disperse dye; c Buffer: acetic acid-sodium acetate, acetic acid 0.5-2g / L, sodium acetate 1-3g / L; d Penetrant: fatty alcohol polyoxyethylene ether 0.5-2g / L; e Defoamer: silicone defoamer 0.1-0.5g / L; f Anti-precipitation agent: polyethylene glycol 1-5g / L; g Deionized water: 50-70 parts.

[0046] There are two types of liquid disperse dyes: azo disperse dyes and anthraquinone disperse dyes.

[0047] Azo disperse dyes are a type of disperse dyes that contain an azo group (-N=N-) in the molecule. Its molecular structure is synthesized from aromatic amine intermediates through diazotization and coupling reactions. Some common azo disperse dyes have aromatic structures such as benzene rings or naphthalene rings. The azo group is connected to these aromatic rings. By changing the substituents on both sides of the azo group, dyes of different colors can be obtained. In addition, the molecule may contain other substituents, such as alkyl, hydroxyl, amino, etc. The type and position of these substituents will affect the color, solubility, dyeing properties, etc. of the dye.

[0048] Azo disperse dyes can provide a wide range of colors, from light to dark. This is because by changing the substituents in the molecular structure, the absorption spectrum of the dye can be adjusted to produce different colors. By connecting different aromatic rings and substituents on both sides of the azo group, dyes of various colors such as yellow, red, and blue can be obtained. Its synthesis process is relatively mature and the raw materials are relatively easy to obtain, so it has certain advantages in production costs, which makes it widely used in the textile printing and dyeing industry. Azo disperse dyes have good dyeing properties and have a certain affinity for hydrophobic fibers such as polyester fibers. Under appropriate dyeing conditions, it can penetrate well into the fiber and achieve uniform dyeing. Among the yellow disperse dyes, the color of Disperse Yellow SE-3GL is mainly due to the combined effect of the azo structure and the surrounding benzene rings and other substituents. This dye is bright in color and can provide a variety of shades from light yellow to dark yellow. It is used for products that require bright yellow tones in the dyeing of polyester trademark ribbons.

[0049] Anthraquinone disperse dyes are a type of disperse dyes with anthraquinone as the basic structural unit. Anthraquinone disperse dyes use anthraquinone as the basic chromophore. The anthraquinone structure is a planar structure composed of three fused benzene rings. There are usually some substituents on the anthraquinone ring, such as amino, hydroxyl, halogen, etc. The presence and position of these substituents will change the properties of the dye. The introduction of amino groups will increase the affinity of the dye to the fiber, and the presence of hydroxyl groups will affect the solubility and color of the dye.

[0050] Anthraquinone disperse dyes tend to have bright colors, especially in blue and purple. This is because the electron cloud distribution and conjugated system of the anthraquinone structure itself make its absorption spectrum have strong absorption in specific areas, thus showing bright colors. Due to the stability of the anthraquinone structure and the way it combines with the fiber, the dye is not easy to fade under light conditions, so anthraquinone disperse dyes usually have good color fastness, especially in terms of light fastness. Disperse Blue 2BLN has an anthraquinone core structure in its molecular structure, and can produce a blue hue through modification with different substituents. In the dyeing of polyester trademark ribbons, it is suitable for dark products with high requirements for color fastness, such as ribbons that need to be exposed to sunlight for a long time or remain color stable after high temperature treatment.

[0051] Among the dyes used in the polyester trademark ribbon, a suitable dye formula helps to improve the color vividness, and a reasonable combination of dyes can also allow disperse dyes to be more effectively absorbed by the polyester trademark ribbon. At the same time, the interaction can reduce dye waste, improve dye solution utilization, and reduce production costs.

[0052] Disperse dyes can provide a rich selection of colors, and in a stable pH environment maintained by a buffer, the dyes can better exert their dyeing properties, making the colors more vivid. Moreover, this stable dyeing environment and good dye penetration also make the colors more durable in subsequent use and reduce fading.

[0053] Dispersants ensure that disperse dyes are evenly dispersed in the dye liquor and prevent dye agglomeration. During the dyeing process, the dye can be evenly adsorbed on the fiber surface of the polyester trademark ribbon. At the same time, the penetrant further promotes the dye to penetrate into the fiber, so that the entire ribbon can be evenly dyed from the surface to the inside, avoiding the occurrence of color flowers, color spots and other phenomena, and ensuring the consistency of the ribbon color. Anti-precipitation agent polyethylene glycol can effectively prevent the precipitation of dyes and auxiliaries. During the dyeing process, especially when the temperature changes or is placed for a long time, the components in the dye liquor are prone to precipitation. The presence of polyethylene glycol can ensure that the components of the dye liquor are evenly distributed and avoid uneven dyeing caused by precipitation. Defoaming agent silicone defoamer can timely eliminate the foam generated during the dyeing process, ensure that the dye liquor is in full contact with the ribbon, prevent the foam from affecting the dyeing effect, and make the entire dyeing process smoother. The use of buffer acetic acid-sodium acetate can stabilize the pH value of the dye liquor within a suitable range. The dyeing effect of polyester trademark ribbon is sensitive to the pH value, and the fluctuation of the pH value will affect the dye uptake rate and color accuracy. By adjusting the buffer, the pH value of the dye solution can be maintained in a range that is conducive to dyeing, which can provide a stable chemical environment for dyeing.

[0054] The synergistic effect of dispersants and penetrants allows the dye to fully contact and be absorbed by the ribbon fibers, reducing dye waste and improving dye utilization, thereby reducing dyeing costs to a certain extent. Each auxiliary agent, including dispersant lignin sulfonate, penetrant fatty alcohol polyoxyethylene ether, silicone defoamer and anti-precipitation agent polyethylene glycol, has a clear dosage range. This precise dosage control not only ensures that they play an effective role in the dyeing process, but also avoids the cost increase caused by excessive use, achieving a balance between cost and benefit. At the same time, the selected auxiliary agents are relatively environmentally friendly at a reasonable dosage. Auxiliary agents such as silicone defoamers and polyethylene glycol have good degradation in the environment and are less harmful to the environment.

[0055] The use of deionized water can reduce pollutants produced by the reaction of impurities in the water with dyes. Moreover, since the dyeing process is more stable and efficient, the utilization rate of dyes and auxiliaries is high, which reduces the amount of dyes and auxiliaries remaining in the wastewater, and reduces the difficulty and cost of wastewater treatment.

[0056] The present invention provides an improved liquid disperse dye dyeing process for polyester trademark ribbons. The process achieves efficient and uniform dyeing of polyester trademark ribbons by optimizing key parameters and conditions in the dyeing process, while improving the utilization rate of dyes and the quality of dyed finished products, overcoming the problems of poor dyeing uniformity, low color fastness and environmental pollution in traditional polyester fiber dyeing processes. The dyeing process provided by the present invention includes pretreatment, dye liquor preparation, dyeing, color fixation treatment, and post-treatment steps. The dyeing temperature, dye liquor concentration, time, and auxiliary agent addition are controlled by specific process parameters and operating procedures, significantly improving the dyeing uniformity and color fastness of the polyester trademark ribbon, reducing the emission of dyes in the dyeing process, and reducing pollution to the environment. The process is suitable for large-scale production and has the advantages of simple operation, low cost, and environmental friendliness.

[0057] In summary, the present invention has the following beneficial effects: 1. Compared with traditional disperse dye powder, the present invention adopts liquid disperse dye, which has the advantages of good solubility, uniform dyeing, high color fastness, low environmental pollution, etc. It can evenly penetrate into the fiber of polyester trademark ribbon, and the dyeing effect is uniform, bright, and has high color fastness; 2. Compared with the existing preparation process, the polyester trademark ribbon liquid disperse dye dyeing process provided by the present invention accurately controls multiple key parameters in the dyeing process, including dyeing temperature, heating rate, dyeing time, dyeing pressure, dye solution pH value and stirring speed. The reasonable setting of these parameters ensures that the dye can be combined with the ribbon fiber under the best conditions, improves color fastness, ensures the efficient dyeing process, avoids repeated operations or dyeing failures caused by unreasonable parameters, and further improves production efficiency; 3. The segmented dyeing method is adopted to control the temperature, heating speed, stirring speed and time at different stages, and to add penetrants, defoamers and anti-precipitants step by step, which can make the liquid dye have better dispersibility and stability, and can be evenly dispersed in the dye solution, thereby improving the utilization rate of the dye and achieving a more uniform dyeing effect. This fine control method can better adapt to the dyeing needs of the dye at different stages and ensure uniform dyeing; 4. The present invention optimizes the utilization rate of dyes and the use of chemical auxiliaries in the dyeing process, and the dye liquor is efficiently prepared. Lignin sulfonate as a dispersant can quickly disperse the dye in the dye liquor, evenly disperse the dye, and keep the dye particles in a stable suspended state in the dye liquor, thereby preventing the aggregation and precipitation of the dye particles, shortening the dyeing time, and improving the production efficiency. The combination of multiple chemical auxiliaries and heat treatment in the color fixing treatment can effectively improve the color fastness and washing resistance of the fabric and reduce the risk of dye fading. 5. The polyester trademark ribbon liquid disperse dye dyeing process provided by the present invention is simple to operate and easy to control, which reduces the complexity and difficulty of manual operation and reduces the production and operation costs; at the same time, improving production efficiency also indirectly reduces the production cost of unit products, and the optimized use of auxiliary agents also reduces unnecessary material consumption and reduces material costs. It is suitable for large-scale production and meets environmental protection requirements at the same time, and can meet the market's large demand for polyester trademark ribbon dyeing. DETAILED DESCRIPTION

[0058] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0059] Example 1

[0060] S1 Pretreatment: Put the polyester trademark ribbon into a solution containing 2g / L degreasing agent, treat it at 50℃ for 25 minutes, and remove the grease and impurities on the ribbon surface by stirring; after degreasing, put the ribbon into a solution containing 3g / L scouring agent, and treat it at 85℃ for 35 minutes to further remove the residual impurities on the ribbon; after scouring, wash it with clean water to room temperature to ensure that the ribbon surface is clean; Preparation of S2 dye solution: select a mixed dye of azo disperse dye and anthraquinone disperse dye in an amount of 3% of the weight of the fabric, use acetic acid-sodium acetate as a buffer, the amount of acetic acid is 1g / L, the amount of sodium acetate is 2g / L, deionized water is added to prepare a solvent with a pH value of 5, the dye is slowly added to the solvent and a dispersant lignin sulfonate with a mass concentration of 15% of the liquid disperse dye is added and stirred evenly, the stirring time is 15 minutes, and the temperature is raised to 60°C at a heating rate of 2.0°C / min, and the stirring is continued at 60°C for 40 minutes, and the stirring speed is controlled at 500 rpm; S3 staining: S31 first stage dyeing: immerse the pretreated polyester trademark ribbon in the prepared dye solution at a weight ratio of 3:97, and dye it in a high temperature and high pressure dyeing machine; add the penetrant fatty alcohol polyoxyethylene ether in an amount of 1g / L, dilute it with 3 times deionized water, and slowly add it to the dye solution under stirring. The speed of the stirring device is controlled at 35 revolutions per minute, the pH value is controlled at 5.0, the heating rate is 6°C / minute within 10 minutes until the dyeing temperature is controlled at 120°C, and the dyeing time is 35 minutes; S32 Second stage dyeing: add 0.3g / L of organosilicon defoamer according to the foam generation situation, dilute the defoamer with 7 times deionized water, and slowly add it to the area with more foam, control the stirring speed at 25 revolutions per minute, pH value at 5.5, heating rate at 0.4℃ / min, dyeing temperature at 125℃, and dyeing time for 12 minutes; S33 third stage dyeing: anti-precipitation agent is added in the final stage of liquid disperse dye production, the dosage of anti-precipitation agent polyethylene glycol is 3g / L, the pH value is controlled at 5.5 during dyeing, the dyeing temperature is controlled at 130℃, the heating rate is 0.2℃ / min, the stirring speed is controlled at a medium-low speed of 20 revolutions per minute, and the stirring is continued for 10 minutes; S4 color fixing treatment: take the dyed ribbon out of the high temperature and high pressure dyeing machine, put it into a solution containing 2g / L color fixing agent for color fixing treatment, treat it at 70℃ for 25 minutes, add a color fixing agent in an amount of 15% of the dye amount, heat treat the ribbon at a temperature of 175℃ for 25 minutes, and rinse it with clean water to cool it down to room temperature after the treatment; S5 post-treatment: The polyester trademark ribbon after color fixation is washed, soaped, dried and sorted, the washing temperature is 50°C, the washing times are 3 times, the washed ribbon is put into a soaping agent solution for soaping treatment, the amount of soaping agent is 2g / L, the treatment temperature is 85°C, and the treatment time is 15 minutes. The washed ribbon is dried by drying at 40°C for 40 minutes. The dried ribbon is sorted by ironing or stretching to remove wrinkles and uneven parts to obtain a dyed polyester trademark ribbon.

[0061] Example 2

[0062] S1 Pretreatment: Put the polyester trademark ribbon into a solution containing 1g / L degreasing agent, treat it at 40℃ for 20 minutes, and remove the grease and impurities on the ribbon surface by stirring; after degreasing, put the ribbon into a solution containing 2g / L scouring agent, treat it at 80℃ for 30 minutes to further remove the residual impurities on the ribbon; after scouring, wash it with clean water to room temperature to ensure that the ribbon surface is clean; Preparation of S2 dye solution: select liquid disperse dye anthraquinone disperse dye with an amount of 1% of the weight of the fabric, use acetic acid-sodium acetate as a buffer, the amount of acetic acid is 0.5g / L, the amount of sodium acetate is 1g / L, add deionized water to prepare a solvent with a pH value of 4.5, slowly add the dye to the solvent and add a dispersant lignin sulfonate with a mass concentration of 10% of the liquid disperse dye and stir evenly, the stirring time is 10 minutes, and the temperature is raised to 55°C at a heating rate of 3°C / min, and the stirring is continued at 55°C for 30 minutes, and the stirring speed is controlled at 400 rpm; S3 staining: S31 The first stage of dyeing: immerse the pretreated polyester trademark ribbon in the prepared dye solution at a weight ratio of 1:99, and dye it in a high-temperature and high-pressure dyeing machine; add the penetrant fatty alcohol polyoxyethylene ether in an amount of 0.5g / L, dilute it with 5 times deionized water, and slowly add it to the dye solution under stirring. The speed of the stirring device is controlled at 30 revolutions per minute, the pH value is controlled at 5.0, the heating rate is 6°C / minute within 10 minutes until the dyeing temperature is controlled at 120°C, and the dyeing time is 30 minutes; S32 Second stage dyeing: add 0.1g / L of organosilicon defoamer according to the foam generation situation, dilute the defoamer with 5 times deionized water, and slowly add it to the area with more foam, control the stirring speed at 20 revolutions per minute, pH value at 5.0, heating rate at 0.3℃ / min, dyeing temperature at 125℃, and dyeing time for 10 minutes; S33 third stage dyeing: anti-precipitation agent is added in the final stage of liquid disperse dye production, the dosage of anti-precipitation agent polyethylene glycol is 1g / L, the pH value is controlled at 5.0 during dyeing, the dyeing temperature is controlled at 130℃, the heating rate is 0.08℃ / min, the stirring speed is controlled at a medium-low speed of 15 revolutions per minute, and the stirring is continued for 5 minutes; S4 color fixing treatment: take the dyed ribbon out of the high temperature and high pressure dyeing machine, put it into a solution containing 1g / L color fixing agent for color fixing treatment, treat it at 60℃ for 20 minutes, add a color fixing agent in an amount of 10% of the dye amount, heat treat the ribbon at 170℃ for 20 minutes, and rinse it with clean water to cool it down to room temperature after the treatment; S5 post-treatment: wash, soap, dry and finish the fixed color polyester trademark ribbon, the washing temperature is 40°C, the washing times are 2 times, the washed ribbon is put into a soap detergent solution for soaping, the amount of soap detergent is 1g / L, the treatment temperature is 80°C, the treatment time is 10 minutes, the washed ribbon is dried by drying, the temperature is controlled at 30°C, the time is 30 minutes, the dried ribbon is finished, and wrinkles and uneven parts are removed by ironing or stretching to obtain a dyed polyester trademark ribbon.

[0063] Example 3

[0064] S1 Pretreatment: Put the polyester trademark ribbon into a solution containing 3g / L degreasing agent, treat it at 60℃ for 30 minutes, and remove the grease and impurities on the ribbon surface by stirring; after degreasing, put the ribbon into a solution containing 5g / L scouring agent, treat it at 90℃ for 40 minutes to further remove the residual impurities on the ribbon; after scouring, wash it with clean water to room temperature to ensure that the ribbon surface is clean; Preparation of S2 dye liquor: select azo disperse dyes of liquid disperse dyes in an amount of 5% of the weight of the fabric, use acetic acid-sodium acetate as a buffer, the amount of acetic acid is 2g / L, the amount of sodium acetate is 3g / L, add deionized water to prepare a solvent with a pH value of 5.5, slowly add the dye to the solvent and add lignin sulfonate, a dispersant with a mass concentration of 30% of the liquid disperse dye, stir evenly, the stirring time is 20 minutes, and the temperature is raised to 60°C at a heating rate of 1.5°C / min, and the stirring is continued at 60°C for 60 minutes, and the stirring speed is controlled at 600 rpm; S3 staining: S31 first stage dyeing: immerse the pretreated polyester trademark ribbon in the prepared dye solution at a weight ratio of 5:95, and dye it in a high temperature and high pressure dyeing machine; add the penetrant fatty alcohol polyoxyethylene ether in an amount of 3g / L, dilute it with 2 times deionized water, and slowly add it to the dye solution under stirring, the speed of the stirring device is controlled at 40 revolutions per minute, the pH value is controlled at 5.5, the heating rate is 6°C / minute within 15 minutes until the dyeing temperature is controlled at 125°C, and the dyeing time is 45 minutes; S32 Second stage dyeing: add 0.5g / L of organosilicon defoamer according to the foam generation situation, dilute the defoamer with 10 times deionized water, and slowly add it to the area with more foam, control the stirring speed at 30 revolutions per minute, pH value at 5.5, heating rate at 0.5℃ / min, dyeing temperature at 130℃, and dyeing time for 15 minutes; S33 third stage dyeing: anti-precipitation agent is added in the final stage of liquid disperse dye production, the dosage of anti-precipitation agent polyethylene glycol is 5g / L, the pH value is controlled at 5.5 during dyeing, the dyeing temperature is controlled at 135℃, the heating rate is 0.2℃ / min, the stirring speed is controlled at a medium-low speed of 25 revolutions per minute, and the stirring is continued for 10 minutes; S4 color fixing treatment: take the dyed ribbon out of the high temperature and high pressure dyeing machine, put it into a solution containing 3g / L color fixing agent for color fixing treatment, treat it at 80℃ for 30 minutes, add a color fixing agent in an amount of 20% of the dye amount, heat treat the ribbon at 180℃ for 30 minutes, and rinse it with clean water to cool it down to room temperature after the treatment; S5 post-treatment: The polyester trademark ribbon after color fixation is washed, soaped, dried and sorted, the washing temperature is 60°C, the washing times are 5 times, the washed ribbon is put into a soaping agent solution for soaping treatment, the amount of soaping agent is 3g / L, the treatment temperature is 90°C, and the treatment time is 20 minutes. The washed ribbon is dried by drying at 60°C for 50 minutes. The dried ribbon is sorted by ironing or stretching to remove wrinkles and uneven parts to obtain a dyed polyester trademark ribbon.

[0065] Comparative Example 1 The polyester trademark webbing is dyed by using a conventional powder disperse dye dyeing process to obtain a dyed polyester trademark webbing.

[0066] Comparative Example 2 The S3 dyeing step uses a traditional high-temperature and high-pressure dyeing method: the pretreated polyester trademark ribbon is immersed in the prepared dye solution, the weight ratio of the ribbon to the dye solution is 3:97, and dyeing is carried out in a high-temperature and high-pressure dyeing machine. The dyeing temperature is 125°C, the dyeing time is 60 minutes, the dyeing pressure is 0.4MPa, and the pH value is controlled at 5.5; the remaining steps are the same as Example 1, and a dyed polyester trademark ribbon is obtained.

[0067] Comparative Example 3 Preparation of S2 dye solution: select a liquid disperse dye with an amount of 7% of the weight of the fabric, do not add a buffer, slowly add the dye to the solvent and add a dispersant lignin sulfonic acid with a mass concentration of 40% of the liquid disperse dye and stir evenly, the stirring time is 15 minutes, and the stirring is continued for 40 minutes after heating; the remaining steps are the same as in Example 1, and a dyed polyester trademark ribbon is obtained.

[0068] Comparative Example 4 S4 color fixing treatment: the dyed ribbon is taken out from the high temperature and high pressure dyeing machine, and placed in a solution containing 1g / L color fixing agent for color fixing treatment. After treatment at 60°C for 15 minutes, a color fixing agent is added in an amount of 5% of the amount of dye. The ribbon is heat treated at a temperature of 175°C for 15 minutes. After the treatment, it is rinsed with clean water and cooled to room temperature. The remaining steps are the same as in Example 1 to obtain a dyed polyester trademark ribbon.

[0069] Comparative Example 5 S1 Pretreatment: The polyester trademark webbing is not degreased or scourged, but directly cleaned to remove oil and impurities on the surface to ensure that the webbing surface is clean and undamaged; S5 post-treatment: washing, soaping, drying and finishing the polyester trademark ribbon after color fixation, the washing temperature is 40-60°C, the washing times are 2-5 times, the washed ribbon is put into a soaping agent solution for soaping treatment, the amount of soaping agent is 1-3g / L, the treatment temperature is 80-90°C, the treatment time is 10-20 minutes, the washed ribbon is dried by drying, the temperature is controlled at 30-60°C, the time is 30-50 minutes, the dried ribbon is finished, and wrinkles and uneven parts are removed by ironing or stretching; the remaining steps are the same as in Example 1, and a dyed polyester trademark ribbon is obtained.

[0070] 1. Experimental Methods Table 1 Quality inspection of polyester ribbons with different dyeing processes

[0071] The dyed polyester trademark ribbons obtained in Examples 1-3 and Comparative Examples 1-5 were tested for relevant quality indicators, including dyeing uniformity, washing test, dry friction and wet friction test, tensile test, dye uptake, and chemical residue test. The results are shown in Table 1.

[0072] 2. Results Analysis Dyeing uniformity is one of the important indicators to measure the dyeing quality of ribbons. During the comparison process, a method combining visual observation and instrumental measurement was adopted. Visual observation found that when the dye solution was not prepared reasonably, the dye was not evenly dispersed, or the temperature, stirring speed and other parameters were not properly controlled during the dyeing process, obvious color spots and color stripes would appear on the surface of the ribbons of comparative examples 1-5, and the color depth was different, while no color spots and color stripes appeared in Examples 1-3. The CIE Lab values ​​at different positions of the ribbon were further measured using a spectrophotometer. The calculated color difference values ​​exceeded 5 in the samples of comparative examples 1-5, which was much higher than the acceptable standard upper limit of 3, while Examples 1-3 were all 0. This shows that dyeing uniformity is affected by a combination of multiple factors. The dyeing processes of Examples 1-3 of the present invention can accurately control each link of the dyeing process to achieve good dyeing uniformity, indicating that the polyester trademark ribbon liquid disperse dye dyeing process of the present invention has outstanding advantages.

[0073] Washing tests were conducted according to ISO105-C06 standards, and the results showed that there were significant differences in the wash fastness of the webbing under different dyeing process conditions. The wash fastness rating results of the samples in Comparative Examples 1-5 were all 2-4, which were all lower than the wash fastness ratings of Examples 1-3, indicating that the wash fastness of the polyester webbing of the existing process was lower than the dyeing process provided by the present invention. Among them, the wash fastness of Comparative Example 5 was only level 2, indicating that when the amount of color fixing agent used in the color fixing process was insufficient or the treatment time was too short, the color of the webbing changed significantly after washing, and the staining to the standard fabric was serious, and the wash fastness rating was only level 2. Under the optimized process conditions of the present invention in Examples 1-3, the color of the webbing was well maintained, there was no obvious staining to the standard fabric, and the wash fastness could reach level 5.

[0074] The dry friction and wet friction tests were carried out by the friction fastness tester according to ISO105-X12 standard, and it was found that the uneven penetration of dyes during the dyeing process would affect the friction fastness. In Comparative Examples 1-5, the dry friction fastness and wet friction fastness were both smaller than those of Examples 1-3. The dry friction fastness of Comparative Examples 1-5 was 3-4, and the wet friction fastness was 2-3. The dry friction fastness of Comparative Example 2 was only 3, and the wet friction fastness was only 2. After the dyeing process of the present invention was used to improve the uniformity of dye penetration and improve the surface treatment of the ribbon, the dry friction fastness of Examples 1-3 could be improved to 5, and the wet friction fastness could be improved to 4.

[0075] According to the ASTM D882 standard, the tensile test was performed on the dyed ribbon using a tensile testing machine. The results showed that different dyeing processes have a certain effect on the breaking strength of the ribbon. When the degreasing and scouring treatments are improper during the pretreatment process, or the chemical additives used in the dyeing process damage the ribbon fibers, the breaking strength of the ribbon will be significantly reduced. In the comparative test, under the process conditions of Examples 1-5, the breaking strength of the ribbon decreased by 20%-30% compared with the undyed original ribbon, among which the breaking strength of Example 3 was only 71.5%, and the breaking strength of Example 5 was only 70.8%. In Examples 1-3, when the pretreatment and dyeing processes are reasonably controlled by the dyeing process of the present invention, the breaking strength of the ribbon can be maintained between 98%-100% of the original ribbon.

[0076] Also in the tensile test, the elongation at break of the webbing was measured. The elongation at break of Comparative Examples 1-5 is smaller than that of Examples 1-3, especially the elongation at break of Comparative Example 2 is only 52.2% of the original webbing, which is a significant decrease, indicating that when the dyeing temperature is too high or the time is too long, the structure of the webbing fiber will change, thereby affecting the elongation at break. In Comparative Examples 1-5, the elongation at break is 30%-50% lower than that of the original webbing. In Examples 1-3, under the dyeing process of the present invention, by optimizing the dyeing temperature and time and other parameters, the elongation at break can be restored to about 90%-95% of the original webbing, ensuring that the webbing has good toughness.

[0077] The dye uptake rate of the dye is calculated by measuring the content of the dye in the dye liquor before and after dyeing to evaluate the dye utilization rate. The experimental results show that the dye concentration in the dye liquor preparation process, the selection and use amount of the dispersant, and the factors such as the temperature, time and stirring speed in the dyeing process all have a significant impact on the dye utilization rate. When the dye concentration in the dye liquor is too high and the dispersant effect is not good, the dye is easy to aggregate and precipitate, resulting in a low dye uptake rate. The dye uptake rate of the samples in Comparative Examples 1-5 is only 40%-60%, wherein the dye uptake rate of Comparative Example 2 is 41.3%, and that of Comparative Example 3 is 41.6%. And in the case where the dye liquor is reasonably configured by the dyeing process of the present invention and the dyeing process parameters are accurately controlled, the dye uptake rate of Examples 1-3 can be increased to 80%-95%, effectively reducing dye waste and environmental pollution.

[0078] High performance liquid chromatography was used to detect chemical residues in the dyed ribbons, with a focus on detecting the residues of chemical substances such as dyes, degreasers, scouring agents and fixing agents. The results showed that when the cleaning process is not thorough, whether it is insufficient water washing times or improper selection of washing temperature and cleaning agent, the chemical residues will exceed the standard. In the samples of comparative examples 1-5, the dye residues exceeded the specified values ​​of the relevant environmental protection standards, which not only affects the quality of the ribbons, but also poses potential hazards to human health and the environment. The dyeing process embodiments 1-3 of the present invention can effectively reduce the chemical residues and make them meet environmental protection standards by optimizing the post-treatment water washing and soap washing steps, including increasing the water washing times, adjusting the water washing temperature and selecting a suitable cleaning agent.

Claims

1. A polyester label ribbon liquid disperse dyeing process, characterized in that: The following steps are involved: S1 Pretreatment: Degreasing and refining the polyester trademark webbing, cleaning the polyester trademark webbing, removing the oil and impurities on the surface, and ensuring that the webbing surface is clean and undamaged; S2 dye liquor preparation: select a liquid disperse dye with an amount of 1-5% of the weight of the fabric, add deionized water to prepare a solvent with a pH value of 4.5-5.5 with acetic acid-sodium acetate as a buffer, slowly add the dye to the solvent and add a dispersant with a mass concentration of 10-30% of the liquid disperse dye to stir evenly, the stirring time is 10-20 minutes, and the stirring is continued for 30-60 minutes after heating; S3 dyeing: immerse the pretreated polyester trademark ribbon into the prepared dye solution, the weight ratio of the ribbon to the dye solution is 1-5:99-95, dye in a high temperature and high pressure dyeing machine, the dyeing temperature is 120-135℃, the dyeing time is 45-70 minutes, the dyeing pressure is 0.3-0.5MPa, and the pH value is controlled at 5-6; adopt the segmented dyeing method, add penetrant, defoamer and anti-precipitant step by step during the dyeing process, and control the temperature, heating rate, stirring speed and time of each section; S4 color fixing treatment: take the dyed ribbon out of the high temperature and high pressure dyeing machine, put it into a solution containing 1-3g / L color fixing agent for color fixing treatment, treat it at 60℃-80℃ for 20-30 minutes, then heat treat the ribbon at 170-180℃ for 20-30 minutes, and rinse it with clean water to cool it down to room temperature after the treatment; S5 post-treatment: wash, soap, dry and finish the polyester trademark ribbon after color fixation, the washing temperature is 40-60℃, the washing times are 2-5 times, the washed ribbon is put into soap detergent solution for soaping, the amount of soap detergent is 1-3g / L, the treatment temperature is 80-90℃, the treatment time is 10-20 minutes, the washed ribbon is dried by drying, the temperature is controlled at 30-60℃, the time is 30-50 minutes, the dried ribbon is finished, and wrinkles and uneven parts are removed by ironing or stretching to obtain a dyed polyester trademark ribbon.

2. A polyester label ribbon liquid disperse dyeing process according to claim 1, characterized in that: The step S1 pre-processing specifically includes the following steps: S11 Degreasing: Place the polyester trademark ribbon in a solution containing 1-3g / L of degreasing agent, treat it at 40-60℃ for 20-30 minutes, and remove grease and impurities on the ribbon surface by stirring; S12 Scouring: After degreasing, place the ribbon in a solution containing 2-5g / L of scouring agent and treat it at 80-90℃ for 30-40 minutes to further remove residual impurities on the ribbon; S13 Cleaning: After scouring, wash with clean water to room temperature to ensure that the surface of the ribbon is clean.

3. The polyester label ribbon liquid disperse dyeing process according to claim 1, characterized in that: The step S2 of dye solution preparation specifically comprises the following steps: S21 Dye selection: According to the color requirements and dyeing depth of the ribbon, select environmentally friendly liquid disperse dyes, the dosage is 1-5% of the fabric weight; S22: preparing the solvent: adding acetic acid-sodium acetate as a buffer into deionized water, mixing well and using it as a solvent for the dye, so that the pH value of the dye solution is 4.5-5.5; S23 Stirring the dye solution: slowly add the dye into the solvent, add the dispersant and stir evenly to ensure that the dye is fully dissolved. The temperature rises to 55-60°C within 10-20 minutes, and the heating rate is 1.5-3.0°C / minute. Maintain 55-60°C and continue stirring for 30-60 minutes. The stirring speed is controlled at 400-600 rpm.

4. The polyester label ribbon liquid disperse dyeing process according to claim 1, characterized in that: The buffer is an acetic acid-sodium acetate buffer system, the amount of acetic acid is 0.5-2g / L, the amount of sodium acetate is 1-3g / L, the calculated amount of buffer components is first stirred and dissolved in 3-5 times 40-50°C deionized water, and after ensuring complete dissolution, it is added to the water prepared for dissolving the dye to prepare a solvent.

5. The polyester label ribbon liquid disperse dyeing process according to claim 1, characterized in that: The dispersant is lignin sulfonate, and its usage is 10-30% of the mass of the disperse dye.

6. The polyester label ribbon liquid disperse dyeing process according to claim 1, characterized in that: The step S3 dyeing adopts a segmented dyeing method, which specifically includes the following steps: S31 first stage dyeing: immerse the pretreated polyester trademark ribbon in the prepared dye solution at a weight ratio of 1:99-5:95, and dye in a high temperature and high pressure dyeing machine; add the penetrant fatty alcohol polyoxyethylene ether in an amount of 0.5-3g / L, dilute it with 2-5 times deionized water, and slowly add it to the dye solution under stirring, the speed of the stirring device is controlled at 30-40 revolutions per minute, the pH value is controlled at 5.0-5.5, the dyeing temperature is controlled at 120-125°C, the heating rate is 0.1-0.2°C / minute, and the dyeing time is 30-45 minutes; S32 The second stage of dyeing: according to the situation of foam generation, add 0.1-0.5g / L of silicone defoamer, dilute the defoamer with 5-10 times of deionized water, and slowly add it to the area with more foam. The stirring speed is controlled at 20-30 revolutions per minute, the pH value is controlled at 5.0-5.5, the dyeing temperature is controlled at 125-130℃, the heating rate is 0.3-0.5℃ / minute, and the dyeing time is 10-15 minutes; S33 third stage dyeing: anti-precipitation agent is added in the final stage of liquid disperse dye production, the dosage of anti-precipitation agent polyethylene glycol is 1-5g / L, the pH value is controlled at 5.0-5.5 during the dyeing process, the dyeing temperature is controlled at 130-135℃, the heating rate is 0.08-0.2℃ / min, the stirring speed is controlled at a medium-low speed of 15-25 revolutions per minute, and the stirring is continued for 5-10 minutes.

7. The polyester label ribbon liquid disperse dyeing process according to claim 1, characterized in that: The step S4 color fixing treatment specifically includes the following steps: S41 chemical additive: put the dyed ribbon into a solution containing 1-3g / L of color fixing agent, control the temperature at 60-80℃, process for 20-30 minutes, and add a color fixing agent in an amount of 10-20% of the dye amount; S42 heat treatment: heat treatment of the ribbon for initial color fixation at a temperature of 170-180°C for 20-30 minutes; S43 Cooling: Rinse the fixed ribbon with clean water until the temperature reaches room temperature.

8. The polyester label ribbon liquid disperse dyeing process according to claim 1, characterized in that: The post-processing step S5 specifically includes the following steps: S51 water cleaning: After the color fixation is completed, the ribbon is placed in clean water for cleaning. The water temperature is controlled at 40-60℃. The cleaning frequency is 2-5 times to remove the residual dyes and chemical additives on the surface of the ribbon. S52 Soaping: After washing, the ribbon is placed in a soaping agent solution for 10-20 minutes. The amount of soaping agent is 1-3g / L, and the temperature is 80-90℃ to remove unfixed dyes and residues. S53 Drying: Dry the cleaned ribbon at a temperature of 30-60°C for 30-50 minutes; S54 Finishing: Flatten the dried ribbon by ironing or stretching to remove wrinkles and uneven parts.

9. The polyester label ribbon liquid disperse dyeing process according to claim 1, characterized in that: The dyeing compound used for the polyester trademark ribbon includes: a Disperse dyes: 15-30 parts of azo disperse dyes or anthraquinone disperse dyes, or azo disperse dyes and anthraquinone disperse dyes mixed dyes; b Dispersant: The dosage of lignin sulfonate is 10-30% of the mass of disperse dye; c Buffer: acetic acid-sodium acetate, acetic acid 0.5-2g / L, sodium acetate 1-3g / L; d Penetrant: fatty alcohol polyoxyethylene ether 0.5-2g / L; e Defoamer: silicone defoamer 0.1-0.5g / L; f Anti-precipitation agent: polyethylene glycol 1-5g / L; g Deionized water: 50-70 parts.

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