A kind of solid dyeing process of polyester fabric
By using ammonium carbonate permeation and frozen deposition on polyester fabrics, combined with alkali roughening and alkali dyeing, the problem of poor dyeing stability of polyester fabrics is solved, and better dyeing effect and surfactivity are achieved.
Patent Information
- Application Number
- CN202411953536.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-04-04
AI Technical Summary
The dyeing stability of existing polyester fabrics is poor, resulting in unstable color.
The permeability, frozen deposition and thermal decomposition of ammonium carbonate is adopted, combined with alkali roughening and alkali dyeing, and the surface activity of polyester fabrics and uniform dyeing of dispersed dyes are improved through sonication and puffing treatment.
It improves the dyeing stability of polyester fabrics, enhances surfactivity, ensures uniform fixation of dispersed dyes, reduces the amount of dispersant used, and avoids the problem of poor dispersant stability at high temperatures.
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of fabrics, and in particular relates to a solid dyeing process for polyester fabrics. Background Art
[0002] Polyester fabric is a kind of chemical fiber clothing fabric that is widely used in daily life. Its biggest advantage is its good wrinkle resistance and shape retention. Therefore, it is suitable for outerwear, various bags, tents and other outdoor products. Polyester fabric is mainly dyed with high temperature and high pressure, and the dyeing temperature reaches 120-130℃. This temperature combined with dispersant can effectively improve the dyeing effect of disperse dyes. However, with the influence of temperature on dispersant, during high temperature setting, the thermal migration of dyes will lead to a decrease in color fastness, resulting in a decrease in the color stability of polyester fabrics. Summary of the invention
[0003] In view of the problems in the prior art, the present invention provides a method for solid dyeing of polyester fabrics, which solves the problem of poor dyeing stability of the existing polyester fabrics. The polyester fabrics are made fluffy by utilizing the penetration, freezing deposition and thermal decomposition of ammonium carbonate, and the surface activity of the polyester fabrics is improved by combining alkali roughening and alkali dyeing, thereby achieving uniform dyeing of disperse dyes.
[0004] In order to achieve the above technical objectives, the technical solution of the present invention is: A method for solid dyeing of polyester fabrics comprises the following steps: Step 1, washing the polyester fabric in an acid solution, then gradually adding soda ash until it is alkaline, and drying after ultrasonic treatment to obtain the pretreated polyester fabric; the acid solution is a hydrochloric acid solution, and the pH of the acid solution is 6-6.5, the temperature is 20-30°C, the soda ash addition rate is 2-5g / min, and the alkaline pH is 8-9, the ultrasonic frequency of the ultrasonic treatment is 80-90kHz, the temperature is 40-50°C; the drying temperature is 80-90°C; this step uses an acid solution to perform acid washing on the polyester fabric, and at the same time, the soda ash is added to the polyester fabric to obtain the pretreated polyester fabric. During the addition process, soda ash reacts with hydrochloric acid to produce bubbles and sodium chloride. The bubbles can effectively improve the liquid's stripping and emulsification properties. At the same time, sodium chloride can also play a stripping and emulsifying effect on oil stains. Soda ash in an alkaline state is kept in an excessive state, which plays an emulsifying role on impurities such as oil stains. Ultrasonic treatment can greatly improve the stripping energy in the entire liquid, improve the rapid stripping of impurities in polyester fabrics, and greatly increase the exposure of the polyester fabric surface. At the same time, ultrasound can fully open the gaps in the polyester fabric and fill the gaps with sodium carbonate and sodium chloride during drying. Step 2, adding ammonium carbonate and a penetrant to water and stirring evenly, then putting the pretreated polyester fabric in and performing low-temperature ultrasound for 20-30 minutes, taking it out and freeze-drying it to obtain a dry polyester fabric, the mass fraction of the ammonium carbonate in the water is 10-25%, the penetrant is the penetrant JFC-4, and the mass fraction of the penetrant in the water is 1-3%, the stirring speed for uniform stirring is 100-400r / min, the mass ratio of the pretreated polyester fabric in the water is 10-15%, the ultrasonic frequency of the low-temperature ultrasound is 60-90kHz, and the temperature is 5-10°C; the freeze-drying temperature is -20°C; in this step, ammonium carbonate and a penetrant are added to water to form a homogeneous permeable solution, and the ammonium carbonate is infiltrated into the gaps of the polyester fabric by means of low-temperature ultrasound, and the water is removed in the subsequent freeze-drying, and the ammonium carbonate is precipitated in situ and fixed inside and outside the polyester fabric; Step 3, after pressing the polyester fabric, keep it warm for 30-50 minutes, and slowly release the pressure to obtain an expanded polyester fabric; the pressing pressure is 0.5-0.6MPa, the insulation temperature is 80-85°C, the release rate of the slow pressure release is 0.05-0.08MPa / min, and the temperature is 30-50°C; in this step, the polyester fabric is tightly fitted by pressing, and materials such as ammonium carbonate are sealed in the gap. At this time, the ammonium carbonate is decomposed by heating to form a large amount of gas, and the pressing sealing performance causes a large amount of gas to fill the gap, thereby achieving a good expansion effect; Step 4, soaking the expanded polyester fabric in an alkali solution for 2-3 minutes, taking it out and slowly heating and drying it to obtain a roughened polyester fabric, wherein the alkali solution is a sodium hydroxide solution with a pH of 8-8.5, and the soaking temperature is 5-10°C; the temperature of the slowly heating and drying is 70-80°C, and the heating rate is 3-5°C / min; this step utilizes the large surface area of the expanded polyester fabric to achieve full contact of the alkali solution with the polyester fabric, and increases the alkali concentration during the heating and drying, which not only effectively improves the surface roughness of the polyester fabric, but also increases the surface activity of the polyester fabric, which helps to improve the attractiveness of the polyester fabric to disperse dyes; Step 5, adding disperse dye, sodium bicarbonate, and leveling agent into water for ultrasonic dispersion to form a dye solution, and then subjecting the roughened polyester fabric to low-temperature ultrasonic treatment, dehydrating and shaping to obtain a dyed polyester fabric, wherein the mass ratio of the dye solution is: 5-7 parts of disperse dye, 0.5-4 parts of sodium bicarbonate, 0.3-0.7 parts of leveling agent, and 70-90 parts of water, wherein the leveling agent is didodecyl dimethyl ammonium bromide; the dispersion temperature of the ultrasonic dispersion is 10-15°C, the ultrasonic frequency is 60-90kHz, the bath ratio of the roughened polyester fabric in the dye solution is 1:10-12, the temperature of the low-temperature ultrasonic treatment is 30-40°C, and the ultrasonic frequency is 80-1 00kHz, the dehydration temperature is 30-40℃; the shaping adopts a shaping roller, the temperature is 50-60℃, and the running speed is 5-10m / min; this step uses sodium bicarbonate to adjust the dye liquor to weak alkalinity, increase the dispersibility and emulsification of disperse dyes, and at the same time, distribute hydroxyl structures on the surface of disperse dyes, cooperate with ultrasonic treatment of expanded polyester fabrics, improve the connection strength of disperse dyes on polyester fabrics, cooperate with subsequent dehydration and shaping, effectively improve the fixation of disperse dyes on the surface of polyester fabrics; at the same time, the shaping roller can effectively improve the tightness of fabrics, thereby reducing the fluffy effect of polyester fabrics, and ensuring the fixed clamping and curing of disperse dyes.
[0005] It can be seen from the above description that the present invention has the following advantages: 1. The present invention solves the problem of poor dyeing stability of existing polyester fabrics. The polyester fabrics are made fluffy by using the penetration, freezing deposition and thermal decomposition of ammonium carbonate, and the surface activity of the polyester fabrics is improved by alkali roughening and alkali dyeing to achieve uniform dyeing with disperse dyes. 2. The present invention utilizes the acid washing treatment and the change of acid washing into alkali washing to achieve the washing and impurity removal of polyester fabrics and improve the impurity stripping effect; 3. The present invention utilizes the deposition of ammonium carbonate under the action of a penetrant to effectively penetrate into the polyester fabric, and combined with the low-temperature stability under freeze drying, the deposition stability of ammonium carbonate is achieved, providing conditions for subsequent internal in-situ decomposition and fluffing; 4. The present invention utilizes a puffing treatment method to increase the surface area of the polyester fabric, and forms a surface alkali treatment by combining alkali washing and drying, which effectively improves the activity of the polyester fabric surface and provides a large number of active sites for subsequent disperse dye fixation. DETAILED DESCRIPTION
[0006] A specific embodiment of the present invention is described in detail in conjunction with the embodiments, but no limitation is imposed on the claims of the present invention. Example 1
[0007] A method for solid dyeing of polyester fabrics comprises the following steps: Step 1, washing the polyester fabric in a hydrochloric acid solution with a pH of 6 at a constant temperature, then gradually adding soda ash at a rate of 2 g / min until alkalinity is formed, and drying after ultrasonic treatment to obtain a pretreated polyester fabric; the temperature of the constant temperature washing is 20° C., the pH of the alkalinity after the soda ash is added is 8, the ultrasonic frequency of the ultrasonic treatment is 80 kHz, and the temperature is 40° C.; the temperature of the drying is 80° C.; Step 2, adding ammonium carbonate and a penetrant to water and stirring evenly at a speed of 100 r / min, then putting the pretreated polyester fabric in and performing low-temperature ultrasound for 20 minutes, taking it out and freeze-drying it to obtain a dry polyester fabric, the mass fraction of the ammonium carbonate in the water is 10%, the penetrant is the penetrant JFC-4, and the mass fraction of the penetrant in the water is 1%, the mass ratio of the pretreated polyester fabric in the water is 10%, the ultrasonic frequency of the low-temperature ultrasound is 60 kHz, and the temperature is 5°C; the freeze-drying temperature is -20°C; Step 3, pressing the polyester fabric at a pressure of 0.5 MPa, keeping the temperature at 80° C. for 30 min, and slowly releasing the pressure at a speed of 0.05 MPa / min to obtain an expanded polyester fabric; the temperature of the slow pressure release is 30° C.; Step 4, soaking the expanded polyester fabric in a sodium hydroxide solution with a pH of 6 for 2 minutes, taking it out and slowly heating and drying it to obtain a roughened polyester fabric, wherein the soaking temperature is 5° C., the slowly heating and drying temperature is 70° C., and the heating rate is 3° C. / min; Step 5, ultrasonically dispersing according to the mass ratio of 5 parts of disperse dye, 0.5 parts of sodium bicarbonate, 0.3 parts of didodecyl dimethyl ammonium bromide and 70 parts of water to form a dye solution, and then low-temperature ultrasonically treating the roughened polyester fabric to obtain a dyed polyester fabric after dehydration and shaping, wherein the dispersion temperature of the ultrasonic dispersion is 10°C, the ultrasonic frequency is 60kHz, the bath ratio of the roughened polyester fabric in the dye solution is 1:10, the temperature of the low-temperature ultrasound is 30°C, the ultrasonic frequency is 80kHz, and the dehydration temperature is 30°C; the shaping adopts a shaping roller with a temperature of 50°C and a running speed of 5m / min. Example 2
[0008] A method for solid dyeing of polyester fabrics comprises the following steps: Step 1, putting the polyester fabric into a hydrochloric acid solution with a pH of 6.5 and washing it at a constant temperature, then gradually adding soda ash at a speed of 5 g / min until alkalinity is formed, and drying it after ultrasonic treatment to obtain the pretreated polyester fabric; the temperature of the constant temperature washing is 25°C, the pH of the alkalinity after the soda ash is added is 8, the ultrasonic frequency of the ultrasonic treatment is 85 kHz, and the temperature is 45°C; the temperature of the drying is 90°C; Step 2, adding ammonium carbonate and a penetrant into water and stirring evenly at a speed of 400 r / min, then putting the pretreated polyester fabric into the water and performing low-temperature ultrasound for 30 minutes, taking it out and freeze-drying it to obtain a dry polyester fabric, wherein the mass fraction of the ammonium carbonate in the water is 25%, the penetrant is the penetrant JFC-4, and the mass fraction of the penetrant in the water is 2%, the mass ratio of the pretreated polyester fabric in the water is 15%, the ultrasonic frequency of the low-temperature ultrasound is 90 kHz, and the temperature is 8°C; the freeze-drying temperature is -20°C; Step 3, pressing the polyester fabric at a pressure of 0.6 MPa, keeping the temperature at 85° C. for 50 min, and slowly releasing the pressure to obtain an expanded polyester fabric; the slow pressure release has a pressure release rate of 0.07 MPa / min and a temperature of 50° C.; Step 4, soaking the expanded polyester fabric in a sodium hydroxide solution with a pH of 8.5 for 3 minutes, taking it out and slowly heating and drying it to obtain a roughened polyester fabric, wherein the soaking temperature is 10° C.; the slowly heating and drying temperature is 80° C., and the heating rate is 5° C. / min; Step 5, ultrasonically dispersing according to the mass ratio of 7 parts of disperse dye, 3 parts of sodium bicarbonate, 0.5 parts of didodecyl dimethyl ammonium bromide and 90 parts of water to form a dye solution, and then subjecting the roughened polyester fabric to low-temperature ultrasonication, dehydrating and shaping to obtain a dyed polyester fabric, wherein the dispersion temperature of the ultrasonic dispersion is 15°C, the ultrasonic frequency is 90kHz, the bath ratio of the roughened polyester fabric in the dye solution is 1:12, the temperature of the low-temperature ultrasound is 40°C, the ultrasonic frequency is 100kHz, and the dehydration temperature is 40°C; the shaping adopts a shaping roller with a temperature of 55°C and a running speed of 8m / min. Example 3
[0009] A method for solid dyeing of polyester fabrics comprises the following steps: Step 1, washing the polyester fabric in a hydrochloric acid solution with a pH of 6 at a constant temperature, then gradually adding soda ash at a rate of 3 g / min until alkalinity is formed, and drying after ultrasonic treatment to obtain the pretreated polyester fabric; the temperature of the constant temperature washing is 30° C., the pH of the alkalinity after the addition of soda ash is 9, the ultrasonic frequency of the ultrasonic treatment is 90 kHz, and the temperature is 50° C.; the temperature of the drying is 85° C.; Step 2, adding ammonium carbonate and a penetrant into water and stirring evenly at a speed of 400 r / min, then putting the pretreated polyester fabric into the water and performing low-temperature ultrasound for 25 minutes, taking it out and freeze-drying it to obtain a dry polyester fabric, wherein the mass fraction of the ammonium carbonate in the water is 15%, the penetrant is the penetrant JFC-4, and the mass fraction of the penetrant in the water is 3%, the mass ratio of the pretreated polyester fabric in the water is 12%, the ultrasonic frequency of the low-temperature ultrasound is 80 kHz, and the temperature is 7°C; the freeze-drying temperature is -20°C; Step 3, pressing the polyester fabric at a pressure of 0.6 MPa, keeping the temperature at 80° C. for 40 minutes, and slowly releasing the pressure to obtain an expanded polyester fabric; the slow pressure release rate is 0.08 MPa / min, and the temperature is 40° C.; Step 4, soaking the expanded polyester fabric in a sodium hydroxide solution with a pH of 8 for 2 minutes, taking it out and slowly heating and drying it to obtain a roughened polyester fabric, wherein the soaking temperature is 8° C.; the slowly heating and drying temperature is 75° C., and the heating rate is 4° C. / min; Step 5, ultrasonically dispersing according to the mass ratio of 6 parts of disperse dye, 4 parts of sodium bicarbonate, 0.7 parts of didodecyl dimethyl ammonium bromide and 80 parts of water to form a dye solution, and then low-temperature ultrasonically treating the roughened polyester fabric to obtain a dyed polyester fabric after dehydration and shaping, wherein the dispersion temperature of the ultrasonic dispersion is 12°C, the ultrasonic frequency is 80kHz, the bath ratio of the roughened polyester fabric in the dye solution is 1:10, the temperature of the low-temperature ultrasound is 35°C, the ultrasonic frequency is 90kHz, and the dehydration temperature is 35°C; the shaping adopts a shaping roller with a temperature of 60°C and a running speed of 10m / min.
[0010] Comparative Example 1 A method for solid dyeing of polyester fabrics comprises the following steps: Step 1, washing the polyester fabric in a hydrochloric acid solution with a pH of 6 at a constant temperature, then gradually adding soda ash at a rate of 3 g / min until alkalinity is formed, and drying after ultrasonic treatment to obtain the pretreated polyester fabric; the temperature of the constant temperature washing is 30° C., the pH of the alkalinity after the addition of soda ash is 9, the ultrasonic frequency of the ultrasonic treatment is 90 kHz, and the temperature is 50° C.; the temperature of the drying is 85° C.; Step 2, adding ammonium carbonate and a penetrant into water and stirring evenly at a speed of 400 r / min, then putting the pretreated polyester fabric into the water and performing low-temperature ultrasound for 25 minutes, taking it out and freeze-drying it to obtain a dry polyester fabric, wherein the mass fraction of the ammonium carbonate in the water is 15%, the penetrant is the penetrant JFC-4, and the mass fraction of the penetrant in the water is 3%, the mass ratio of the pretreated polyester fabric in the water is 12%, the ultrasonic frequency of the low-temperature ultrasound is 80 kHz, and the temperature is 7°C; the freeze-drying temperature is -20°C; Step 3, pressing the polyester fabric at a pressure of 0.6 MPa, keeping the temperature at 80° C. for 40 minutes, and slowly releasing the pressure to obtain an expanded polyester fabric; the slow pressure release rate is 0.08 MPa / min, and the temperature is 40° C.; Step 4, according to the mass ratio of 6 parts of disperse dye, 4 parts of sodium bicarbonate, 0.7 parts of didodecyl dimethyl ammonium bromide, and 80 parts of water, ultrasonic dispersion is performed to form a dye solution, and then the expanded polyester fabric is subjected to low-temperature ultrasonication, and the dyed polyester fabric is obtained after dehydration and shaping. The dispersion temperature of the ultrasonic dispersion is 12°C, the ultrasonic frequency is 80kHz, the bath ratio of the roughened polyester fabric in the dye solution is 1:10, the temperature of the low-temperature ultrasound is 35°C, the ultrasonic frequency is 90kHz, and the dehydration temperature is 35°C; the shaping adopts a shaping roller with a temperature of 60°C and a running speed of 10m / min.
[0011] Comparative Example 2 A method for solid dyeing of polyester fabrics comprises the following steps: Step 1, washing the polyester fabric in a hydrochloric acid solution with a pH of 6 at a constant temperature, then gradually adding soda ash at a rate of 3 g / min until alkalinity is formed, and drying after ultrasonic treatment to obtain the pretreated polyester fabric; the temperature of the constant temperature washing is 30° C., the pH of the alkalinity after the addition of soda ash is 9, the ultrasonic frequency of the ultrasonic treatment is 90 kHz, and the temperature is 50° C.; the temperature of the drying is 85° C.; Step 2, soaking the pretreated polyester fabric in a sodium hydroxide solution with a pH of 8 for 2 minutes, taking it out and slowly heating and drying it to obtain a roughened polyester fabric, wherein the soaking temperature is 8° C.; the slowly heating and drying temperature is 75° C., and the heating rate is 4° C. / min; Step 3, ultrasonically dispersing according to the mass ratio of 6 parts of disperse dye, 4 parts of sodium bicarbonate, 0.7 parts of didodecyl dimethyl ammonium bromide and 80 parts of water to form a dye solution, and then low-temperature ultrasonically treating the roughened polyester fabric to obtain a dyed polyester fabric after dehydration and shaping, wherein the dispersion temperature of the ultrasonic dispersion is 12°C, the ultrasonic frequency is 80kHz, the bath ratio of the roughened polyester fabric in the dye solution is 1:10, the temperature of the low-temperature ultrasound is 35°C, the ultrasonic frequency is 90kHz, and the dehydration temperature is 35°C; the shaping adopts a shaping roller with a temperature of 60°C and a running speed of 10m / min.
[0012] Performance Testing The solid-dyed polyester fabrics of Examples 1-3 and Comparative Examples 1-2 were tested, and the results were as follows: Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Light fastness 5.0 5.0 5.0 4.5 4.5 Soap fastness 4.5 4.5-5.0 4.5 4.0 4.0 Dry rubbing fastness 4.5 4.5-5.0 4.5-5.0 4.0 4.0-4.5 Wet rubbing fastness 4.0-4.5 4.5 4.0-4.5 3.5-4.0 4.0 From the performance test data of the above-mentioned Examples 1-3 and Comparative Examples 1-2, it can be seen that the present technical solution adopts an ammonium carbonate-based puffing treatment and a sodium hydroxide-based roughening treatment, which effectively improves the surface activity of the polyester fabric, and ensures that the disperse dye forms a stable connection with the polyester fabric after subsequent alkaline dyeing, which not only effectively reduces the amount of dispersant used, but also eliminates the problem of poor stability of the dispersant at high temperature. At the same time, from the comparison between Example 3 and Comparative Examples 1-2, it can be seen that both the puffing treatment and the roughening treatment can effectively improve the fastness of the disperse dye on the polyester fabric. There is no obvious difference in the dyed polyester fabrics of Examples 1-3, which meets customer requirements.
[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 method for fixing dyeing of polyester fabric, characterized in that: The solid dyeing method comprises the following steps: Step 1, washing the polyester fabric in an acid solution, then gradually adding soda ash to make it alkaline, and drying after ultrasonic treatment to obtain the pretreated polyester fabric; Step 2, adding ammonium carbonate and a penetrant into water and stirring evenly, then placing the pretreated polyester fabric into the water and subjecting it to low temperature ultrasound for 20-30 minutes, taking it out and freeze-drying it to obtain a dry polyester fabric; Step 3, after pressing the polyester fabric, keeping it warm for 30-50 minutes, and slowly releasing the pressure to obtain an expanded polyester fabric; Step 4, soaking the expanded polyester fabric in an alkaline solution for 2-3 minutes, taking it out and slowly heating and drying it to obtain a roughened polyester fabric; Step 5, adding disperse dye, sodium bicarbonate and leveling agent into water for ultrasonic dispersion to form dye solution, and then subjecting the roughened polyester fabric to low temperature ultrasonic treatment, dehydration and shaping to obtain dyed polyester fabric.
2. The method for fixing dyeing of polyester fabric according to claim 1, characterized in that: The acid solution in step 1 is hydrochloric acid solution, and the pH of the acid solution is 6-6.5, the temperature is 20-30° C., the addition rate of soda ash is 2-5 g / min, and the alkaline pH is 8-9.
3. The method for fixing dyeing of polyester fabric according to claim 1, characterized in that: The ultrasonic frequency of the ultrasonic treatment in step 1 is 80-90 kHz and the temperature is 40-50°C; the temperature of the drying is 80-90°C.
4. The method for fixing dyeing of polyester fabric according to claim 1, characterized in that: The mass fraction of ammonium carbonate in water in step 2 is 10-25%, the penetrant is JFC-4, and the mass fraction of the penetrant in water is 1-3%, and the stirring speed for uniform stirring is 100-400 r / min.
5. The method for fixing dyeing of polyester fabric according to claim 1, characterized in that: The mass ratio of the pretreated polyester fabric in water in step 2 is 10-15%, the ultrasonic frequency of low-temperature ultrasound is 60-90kHz, and the temperature is 5-10°C; the temperature of freeze drying is -20°C.
6. The method for fixing dyeing of polyester fabric according to claim 1, characterized in that: The pressing pressure in step 3 is 0.5-0.6 MPa, the insulation temperature is 80-85°C, the slow pressure release speed is 0.05-0.08 MPa / min, and the temperature is 30-50°C.
7. The method for solid dyeing of polyester fabric according to claim 1, characterized in that: The alkali solution in step 4 is sodium hydroxide solution with a pH of 8-8.5, and the soaking temperature is 5-10°C; the temperature of the slowly heating and drying is 70-80°C, and the heating rate is 3-5°C / min.
8. The method for fixing dyeing of polyester fabric according to claim 1, characterized in that: The mass ratio of the dye solution in step 5 is: 5-7 parts of disperse dye, 0.5-4 parts of sodium bicarbonate, 0.3-0.7 parts of leveling agent, and 70-90 parts of water.
9. The method for fixing dyeing of polyester fabric according to claim 8, characterized in that: The leveling agent is didodecyl dimethyl ammonium bromide.
10. The method for fixing dyeing of polyester fabric according to claim 1, characterized in that: The dispersion temperature of the ultrasonic dispersion in step 5 is 10-15°C, the ultrasonic frequency is 60-90kHz, the bath ratio of the roughened polyester fabric in the dye solution is 1:10-12, the temperature of the low-temperature ultrasound is 30-40°C, the ultrasonic frequency is 80-100kHz, and the temperature of the dehydration is 30-40°C; the shaping adopts a shaping roller with a temperature of 50-60°C and a running speed of 5-10m / min.