A dyeing and finishing method for pure color polyester fabric
During the dyeing and finishing process of polyester fabrics, trichloromethylsilane is used to combine with dispersed dyes to form a silicon oxygen shell, which solves the problem of dispersed dyes aggregation under high temperature and high pressure, and improves the stability and fixity of the dyes, improving the uniformity and color fastness of the dyes.
Patent Information
- Application Number
- CN202411868594.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-04-04
AI Technical Summary
In the dyeing and finishing of polyester fabrics, dispersed dyes are prone to aggregate under high temperature and high pressure, resulting in poor uniformity of the dyes, and color stains, color points and other phenomena may occur.
By combining trichloromethylsilane with dispersed dyes, a silicon-oxygen shell is formed, which reduces the impact of temperature on the dye, and ensures the stability and fixation of the dye through low-temperature ultrasonication and reduced pressure distillation.
It effectively improves the stability and fixity of the dispersed dye, avoids the aggregation of dyes under high temperature and high pressure, and improves the uniformity and color fastness of the dye.
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Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of polyester fabrics, and in particular relates to a dyeing and finishing method for pure-color polyester fabrics. Background Art
[0002] Disperse dyes are dyes with relatively small molecules and no water-soluble groups in their structure. They can dye polyester fibers, acetate fibers and polyamide fibers, and are special dyes for polyester. Disperse dyes form a homogeneous suspension through a dispersant and are infected on polyester fabrics through the dispersant, thereby creating a dyeing effect. However, during the dyeing and finishing of polyester fabrics, polyester fabrics aggregate during high-temperature and high-pressure dyeing and finishing, and the effect of the dispersant is weakened, resulting in the aggregation of disperse dye particles to form large particles, which leads to poor uniformity of polyester dyes and even the appearance of color stains and color spots. Summary of the invention
[0003] In view of the problems in the prior art, the present invention provides a dyeing and finishing method for pure-color polyester fabrics, which solves the aggregation problem of existing disperse dyes under high temperature and high pressure, and uses trichloromethylsilane to form a silica shell layer on the disperse dye, which not only improves the heat insulation of the silica shell layer, but also effectively reduces the influence of temperature on the disperse dye, thereby improving the stability of the disperse dye and its fixation on the polyester fiber.
[0004] In order to achieve the above technical objectives, the technical solution of the present invention is: A dyeing and finishing method for pure color polyester fabric comprises the following steps: Step 1, adding trichloromethylsilane to diethyl ether and stirring evenly, then adding distilled water and performing low-temperature ultrasound for 20-30 minutes, and obtaining a trihydroxymethylsilane aqueous solution by vacuum distillation, wherein the concentration of the trichloromethylsilane in diethyl ether is 100-400 g / L, the stirring speed for uniform stirring is 300-500 r / min, the amount of distilled water added is 40-60% of the volume of diethyl ether, the temperature of the low-temperature ultrasound is 5-10° C., the ultrasonic frequency is 50-80 kHz, the temperature of the vacuum distillation is 20-30° C., and the pressure is 80-90% of the atmospheric pressure. , this step utilizes the solubility of trichloromethylsilane in diethyl ether and evenly distributes it in diethyl ether; in the low-temperature ultrasonic treatment, although distilled water forms a slightly soluble state with diethyl ether, the high-frequency vibration of ultrasound evenly disperses the diethyl ether and distilled water, and utilizes distilled water and trichloromethylsilane to form a hydrolysis reaction, thereby obtaining trihydroxymethylsilane, and at the same time, low-temperature ultrasound ensures that trihydroxymethylsilane is uniformly dispersed and does not produce condensation; in the reduced pressure distillation, diethyl ether is converted into steam under this environment to obtain trihydroxymethylsilane, and trihydroxymethylsilane contains hydrogen chloride; that is, the system is acidic; Step 2, adding disperse dye to trihydroxymethylsilane aqueous solution, low-temperature ultrasonication for 20-30 minutes, filtering and drying to obtain silicon-oxygen modified disperse dye, the mass ratio of the disperse dye to trichloromethylsilane is 1:2-4, the temperature of the low-temperature ultrasonication is 2-7°C, the ultrasonic frequency is 70-90kHz, the temperature of the drying is 60-80°C, and the drying is carried out under a nitrogen atmosphere; in this step, the disperse dye is used to form a suspended state in trihydroxymethylsilane, and the hydrogen chloride in the solution is used to directly act on the disperse dye, and ensure that the surface thereof forms a positive electrical property, and the positive electrical property ensures that the trihydroxymethylsilane is adsorbed, thereby obtaining the trihydroxymethylsilane-wrapped disperse dye; in the drying after filtering, the trihydroxymethylsilane is in-situ polycondensed to form a silicon-oxygen wrapped structure; the silicon-oxygen structure formed by the polycondensation of trihydroxymethylsilane has good transparency and does not affect the color conduction of the internal disperse dye, and secondly, the surface of the silicon-oxygen wrapped disperse dye contains silanol groups and has a stable and uniform structure; Step 3, putting the polyester fabric into an ethanol aqueous solution containing sodium hydroxide, ultrasonically treating it for 20-40 minutes, washing it with water and then drying it to obtain a clean polyester fabric, wherein the volume proportion of ethanol in the ethanol aqueous solution is 30-40%, and the pH of the ethanol aqueous solution is 9, the bath ratio of the polyester fabric in the ethanol aqueous solution is 1:10-15, the ultrasonic frequency of the ultrasonic treatment is 80-100kHz, and the temperature is 10-20°C; the bath ratio of the water washing is 1:15-20, and the drying temperature is 80-100°C; in this step, the polyester fabric is washed with an alkaline ethanol aqueous solution to achieve the effect of cleaning the polyester fabric, effectively removing impurities and dust on the polyester fabric, and at the same time, in the subsequent water washing, the solubility of distilled water in sodium hydroxide and ethanol achieves the washing effect; after drying, a clean polyester fabric is obtained; Step 4, adding silicon-oxygen modified disperse dye, dispersant and pH regulator into water to mix to form dye, then putting clean polyester fabric into it and reacting at high temperature and high pressure for 30-50 minutes, keeping warm for 1-2 hours, and cooling to room temperature to obtain dyed polyester fabric; the mass ratio of the dye is: 20-25 parts of silicon-oxygen modified disperse dye, 2-3 parts of dispersant, 0.1-0.2 parts of pH regulator, 50-60 parts of water, the dispersant is alkylphenol polyoxyethylene ether or fatty alcohol polyoxyethylene ether, the pH regulator is sodium hydroxide solution, and the pH is 9, the bath ratio of the clean polyester fabric into the dye is 1:5-10, the temperature of the high temperature and high pressure reaction is 120-130°C, the heating rate is 1.4-1.6°C / min, the pressure is 1.3-1.5MPa, and the insulation temperature is 90-95°C. In this step, the silicon-oxygen modified disperse dye is treated with a dispersant. A homogeneous dispersion is formed, and the silanol group on the surface of the silicon-oxygen modified disperse dye is inherently active, and a stable dispersion is formed under the action of the dispersant and hydrogen bonds. In the high temperature and high pressure reaction, the polyester fabric forms a segment convergence movement of the polyester fiber and generates instantaneous pores. With the permeability of the dispersant itself, the silicon-oxygen modified disperse dye is directly penetrated into the polyester fabric, and at the same time, the silicon-oxygen modified disperse dye surface is ensured to be connected to the polyester fiber in the form of a chemical bond, and a stable connection is formed during the heat preservation treatment. During the cooling process, the polyester fiber is ensured to shrink and the silicon-oxygen modified disperse dye is physically clamped, thereby ensuring the dual chemical and physical fixation of the silicon-oxygen modified disperse dye. At the same time, the dye solution effectively reduces the amount of dispersant used, improves the dispersibility of the silicon-oxygen modified disperse dye itself, reduces the influence of the dispersant on the silicon-oxygen modified disperse dye, and improves the stability of the silicon-oxygen modified disperse dye.
[0005] It can be seen from the above description that the present invention has the following advantages: 1. The present invention solves the aggregation problem of existing disperse dyes under high temperature and high pressure, and uses trichloromethylsilane to form a silicon-oxygen shell layer on the disperse dye, which not only improves the heat insulation of the silicon-oxygen shell layer, but also effectively reduces the influence of temperature on the disperse dye, thereby improving the stability of the disperse dye and its fixation on the polyester fiber; 2. The present invention utilizes trichloromethylsilane to form a silicone shell on the surface of the disperse dye by polycondensation, which not only has a good heat insulation barrier effect, prevents the influence of temperature and oxygen on the disperse dye, and improves the stability of the disperse dye, but also forms a rich silanol group on the surface of the disperse dye to form a stable connection in the form of chemical bonds, and the silicone shell has good transparency and does not affect the color of the disperse dye. DETAILED DESCRIPTION
[0006] The present invention is described in detail with reference to the embodiments, but no limitation is imposed on the claims of the present invention. Example 1
[0007] A dyeing and finishing method for pure color polyester fabric comprises the following steps: Step 1, 1000g of trichloromethylsilane is placed in 10L of ether and stirred at a speed of 300r / min to form a 100g / L trichloromethylsilane ether solution, and then 4L of distilled water is added dropwise to the trichloromethylsilane ether solution, and the dropwise addition is completed within half an hour, and then it is ultrasonically vibrated at 5°C and 50kHz for 20min; after the ultrasonication, it is vacuum distilled at a temperature of 20°C under a pressure of 80% of atmospheric pressure, and the ether is evaporated and recovered to obtain a trihydroxymethylsilane aqueous solution; Step 2, adding 500g of disperse dye to the disperse dye in step 1, and ultrasonically vibrating at a frequency of 70kHz for 20min at 2°C, filtering and drying at 60°C to obtain a silicone-modified disperse dye; the disperse dye is disperse red R; Step 3, weighing the silicon-oxygen modified disperse dye, the dispersant, the pH adjuster, and water, and then preparing the dye according to the mass ratio of 20 parts of the silicon-oxygen modified disperse dye, 2 parts of the dispersant, 0.1 parts of the pH adjuster, and 50 parts of water, wherein the dispersant is alkylphenol polyoxyethylene ether, and the pH adjuster is sodium hydroxide solution, and the pH is 9; Step 4, placing the polyester fabric in an ethanol aqueous solution with a pH of 9 and an ethanol volume content of 30% to form a solution with a bath ratio of 1:10, ultrasonically vibrating at a frequency of 80 kHz at 10° C., filtering, washing, and drying at 80° C. to obtain a clean polyester fabric; Step 5, the clean polyester fabric after washing is placed in the dye of step 3 to form a bath ratio of 1:5, and then an environment of 120°C and 1.3MPa is formed at a heating rate of 1.4°C / min, and the reaction is carried out for 30 minutes, and the temperature is kept at 90°C for 1 hour, and then the temperature is naturally cooled to room temperature to obtain a dyed polyester fabric. Example 2
[0008] A dyeing and finishing method for pure color polyester fabric comprises the following steps: Step 1, 4000g of trichloromethylsilane is placed in 10L of ether at a stirring speed of 500r / min to form a 400g / L trichloromethylsilane ether solution, and then 6L of distilled water is added to the trichloromethylsilane ether solution, and then it is ultrasonically vibrated at 10°C and 80kHz for 30min; after the ultrasonication, it is vacuum distilled at a temperature of 30°C under a pressure of 90% of atmospheric pressure, and the ether is evaporated and recovered to obtain a trihydroxymethylsilane aqueous solution; Step 2, adding 250g of disperse dye to the disperse dye in step 1, and ultrasonically vibrating at a frequency of 90kHz for 30min at 7°C, filtering and drying at 80°C to obtain a silicone-modified disperse dye; the disperse dye is disperse yellow SE-NGL; Step 3, weighing the silicon-oxygen modified disperse dye, the dispersant, the pH adjuster, and water, and then preparing the dye according to the mass ratio of 25 parts of the silicon-oxygen modified disperse dye, 3 parts of the dispersant, 0.2 parts of the pH adjuster, and 60 parts of water, wherein the dispersant is fatty alcohol polyoxyethylene ether, and the pH adjuster is sodium hydroxide solution, and the pH is 9; Step 4, placing the polyester fabric in an ethanol aqueous solution with a pH of 9 and an ethanol volume content of 40% to form a solution with a bath ratio of 1:15, ultrasonically vibrating at a frequency of 100 kHz at 20° C., filtering and washing, and then drying at 100° C. to obtain a clean polyester fabric; Step 5, the clean polyester fabric after washing is placed in the dye of step 3 to form a bath ratio of 1:10, and then an environment of 130°C and 1.5MPa is formed at a heating rate of 1.6°C / min, and the reaction is carried out for 30 minutes, and the temperature is kept at 95°C for 2 hours, and then the temperature is naturally cooled to room temperature to obtain a dyed polyester fabric. Example 3
[0009] A dyeing and finishing method for pure color polyester fabric comprises the following steps: Step 1, 2000g of trichloromethylsilane is placed in 10L of ether and stirred at a speed of 400r / min to form a 200g / L trichloromethylsilane ether solution, and then 5L of distilled water is added dropwise to the trichloromethylsilane ether solution, and the dropwise addition is completed within half an hour, and then it is ultrasonically vibrated at 8°C and 70kHz for 30min; after the ultrasonication, it is vacuum distilled at a temperature of 30°C under a pressure of 85% of atmospheric pressure, and the ether is evaporated and recovered to obtain a trihydroxymethylsilane aqueous solution; Step 2, adding 300 g of disperse dye to the disperse dye in step 1, and ultrasonically vibrating at a frequency of 80 kHz at 5° C. for 30 min, filtering and drying at 70° C. to obtain a silicone-modified disperse dye; Step 3, weighing the silicon-oxygen modified disperse dye, the dispersant, the pH adjuster, and water, and then preparing the dye according to the mass ratio of 22 parts of silicon-oxygen modified disperse dye, 2 parts of dispersant, 0.1 parts of pH adjuster, and 55 parts of water, wherein the dispersant is alkylphenol polyoxyethylene ether, the pH adjuster is sodium hydroxide solution, and the pH is 9; the disperse dye is disperse orange; Step 4, placing the polyester fabric in an ethanol aqueous solution with a pH of 9 and an ethanol volume content of 35% to form a solution with a bath ratio of 1:12, ultrasonically vibrating at a frequency of 90 kHz at 15° C., filtering, washing, and drying at 90° C. to obtain a clean polyester fabric; Step 5, the clean polyester fabric after washing is placed in the dye of step 3 to form a bath ratio of 1:8, and then an environment of 125°C and 1.4MPa is formed at a heating rate of 1.5°C / min, and the reaction is carried out for 25 minutes, and the temperature is kept at 90°C for 1 hour, and then the temperature is naturally cooled to room temperature to obtain a dyed polyester fabric.
[0010] Comparative Example 1 A dyeing and finishing method for pure color polyester fabric comprises the following steps: Step 1, weighing disperse dye, dispersant, pH adjuster, and water, and then preparing dye according to the mass ratio of 22 parts of silicone-modified disperse dye, 2 parts of dispersant, 0.1 parts of pH adjuster, and 55 parts of water, wherein the dispersant is alkylphenol polyoxyethylene ether, the pH adjuster is sodium hydroxide solution, and the pH is 9; the disperse dye is disperse orange; Step 2, placing the polyester fabric in an ethanol aqueous solution with a pH of 9 and an ethanol volume content of 35% to form a solution with a bath ratio of 1:12, ultrasonically vibrating at a frequency of 90 kHz at 15° C., filtering, washing, and drying at 90° C. to obtain a clean polyester fabric; Step 3, the clean polyester fabric after washing is placed in the dye of step 1 to form a bath ratio of 1:8, and then an environment of 125°C and 1.4MPa is formed at a heating rate of 1.5°C / min, and the reaction is carried out for 25 minutes, and the temperature is kept at 90°C for 1 hour, and then the temperature is naturally cooled to room temperature to obtain a dyed polyester fabric.
[0011] The polyester fabrics of Examples 1-3 and the comparative example were tested, and the results were as follows: Testing method: The polyester fabrics prepared in Examples 1-3 and the comparative example were cut into block fabrics and tested for color fastness in accordance with GB / T 3920-2008, GB / T 3921-2008 and GB / T 8427-2008.
[0012] Comparison of the data of the above examples 1-3 and the comparative example shows that the technical solution uses trichloromethylsilane to deposit on the surface of the disperse dye by hydrolysis and adsorption, and forms a silicone shell by polycondensation. The disperse dye can effectively improve the color fastness and friction resistance of the polyester fabric. At the same time, the thermal insulation and surface silanol activity of the silicone shell improve the color stability and coloring rate. That is, the dyeing and finishing method provided by the technical solution effectively improves the color fastness.
[0013] It is understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the protection scope of the present invention.
Claims
1. A dyeing and finishing method for pure color polyester fabric, characterized in that: The steps include: Step 1, adding trichloromethylsilane to ether and stirring evenly, then adding distilled water and performing low temperature ultrasonic treatment for 20-30 minutes, and performing reduced pressure distillation to obtain a trihydroxymethylsilane aqueous solution; Step 2, adding disperse dye to trihydroxymethylsilane aqueous solution, performing low temperature ultrasonic treatment for 20-30 minutes, filtering and drying to obtain silicon-oxygen modified disperse dye; Step 3, placing the polyester fabric in an ethanol aqueous solution containing sodium hydroxide, ultrasonically treating for 20-40 minutes, washing with water and then drying to obtain a clean polyester fabric; Step 4, adding the silicon-oxygen modified disperse dye, dispersant and pH adjuster into water to mix to form a dye, then putting the clean polyester fabric into the water and reacting at high temperature and high pressure for 30-50 minutes, keeping the temperature for 1-2 hours, and cooling to room temperature to obtain the dyed polyester fabric.
2. The dyeing and finishing method of pure color polyester fabric according to claim 1, characterized in that: The concentration of trichloromethylsilane in diethyl ether in step 1 is 100-400 g / L, and the stirring speed for uniform stirring is 300-500 r / min.
3. The dyeing and finishing method of pure color polyester fabric according to claim 1, characterized in that: The amount of distilled water added in step 1 is 40-60% of the volume of ether, the temperature of the low-temperature ultrasound is 5-10°C, the ultrasonic frequency is 50-80kHz, the temperature of the reduced pressure distillation is 20-30°C, and the pressure is 80-90% of the atmospheric pressure.
4. The dyeing and finishing method of pure color polyester fabric according to claim 1, characterized in that: The mass ratio of the disperse dye to trichloromethylsilane in step 2 is 1:2-4, the temperature of the low-temperature ultrasound is 2-7°C, and the ultrasound frequency is 70-90kHz.
5. The dyeing and finishing method of pure color polyester fabric according to claim 1, characterized in that: The drying temperature in step 2 is 60-80° C. and the drying is carried out under a nitrogen atmosphere.
6. The dyeing and finishing method of pure color polyester fabric according to claim 1, characterized in that: The volume proportion of ethanol in the ethanol aqueous solution in step 3 is 30-40%, and the pH of the ethanol aqueous solution is 9. The bath ratio of the polyester fabric in the ethanol aqueous solution is 1:10-15.
7. The dyeing and finishing method of pure color polyester fabric according to claim 1, characterized in that: The ultrasonic frequency of the ultrasonic treatment in step 3 is 80-100 kHz and the temperature is 10-20°C; the bath ratio of the water washing is 1:15-20, and the drying temperature is 80-100°C.
8. The dyeing and finishing method of pure color polyester fabric according to claim 1, characterized in that: The mass ratio of the dye in step 4 is: 20-25 parts of silicone-modified disperse dye, 2-3 parts of dispersant, 0.1-0.2 parts of pH adjuster, and 50-60 parts of water. The dispersant is alkylphenol polyoxyethylene ether or fatty alcohol polyoxyethylene ether, and the pH adjuster is sodium hydroxide solution with a pH of 9.
9. The dyeing and finishing method of pure color polyester fabric according to claim 1, characterized in that: The bath ratio of the clean polyester fabric in step 4 to the dye is 1:5-10, the temperature of the high temperature and high pressure reaction is 120-130°C, the heating rate is 1.4-1.6°C / min, the pressure is 1.3-1.5MPa, and the insulation temperature is 90-95°C.