A bacteriostatic polyester fabric dyeing process

Abstract

This invention discloses a dyeing process for antibacterial polyester fabric, belonging to the field of textile dyeing and finishing technology. The process first pre-shapes the polyester fabric using a hot air setting machine, then prepares a dyeing working solution containing disperse dyes, dispersing and leveling agents, and reactive antibacterial finishing agents. The fabric is then placed in a high-temperature, high-pressure dyeing machine for simultaneous dyeing and antibacterial treatment. By controlling the pH value of the dye solution, the heating rate, and the heat preservation parameters, the dye and antibacterial components are simultaneously dyed and fixed. After dyeing, the fabric undergoes sequential washing, reduction cleaning, neutralization, and cationic color fixing treatments. Finally, it is dried in sections and stretched for setting, resulting in the antibacterial polyester fabric. This invention integrates the dyeing process with antibacterial finishing, improving the compatibility of dyes and antibacterial agents, enhancing the fabric's antibacterial durability and color fastness, and is compatible with conventional textile dyeing and finishing equipment. It allows for wastewater recycling, combining high production efficiency and environmental friendliness, and is suitable for industrial-scale mass production.

Description

Technical Field

[0001] This invention relates to the field of textile dyeing and finishing technology, specifically to a dyeing process for antibacterial polyester fabrics. Background Technology

[0002] Polyester fabrics are widely used in clothing, home textiles, and decorative fabrics due to their high strength, good crispness, and easy washing and quick drying. However, polyester fibers have poor moisture absorption and a smooth surface, making them prone to absorbing sweat and microorganisms during use. This can become a breeding ground for bacteria and fungi, leading to unpleasant odors, affecting wearing comfort, and posing hygiene and safety risks.

[0003] Currently, the processing of antibacterial polyester fabrics mostly involves separate dyeing and antibacterial finishing processes, which suffers from problems such as lengthy procedures, high energy and water consumption, and low production efficiency. Some co-bath dyeing processes have defects such as poor compatibility between dyes and antibacterial agents, easy color variations, color stains, and uneven distribution of antibacterial components. The antibacterial performance of the finished fabric decreases significantly after multiple washes. At the same time, conventional high-temperature and high-pressure dyeing processes are energy-intensive, and direct discharge of dyeing wastewater causes resource waste and environmental pollution. Moreover, most processes only achieve a single antibacterial function, making it difficult to simultaneously meet the needs of color fastness, fabric hand feel, and multiple functions. Therefore, developing an integrated polyester dyeing process that is simple in process, adaptable to existing production equipment, has a long-lasting antibacterial effect, and is environmentally friendly and efficient has significant practical application value. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a dyeing process for antibacterial polyester fabrics.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a dyeing process for antibacterial polyester fabric, comprising the following steps:

[0006] Step 1: The polyester fabric is first pre-shaped using a hot air setting machine;

[0007] Step 2: Prepare the dyeing working solution and add disperse dye, dispersing and leveling agent and polyester-specific antibacterial finishing agent to the working solution;

[0008] Step 3: Place the pre-shaped polyester fabric into a high-temperature and high-pressure dyeing machine and immerse it in the above-mentioned dyeing working solution for dyeing and antibacterial treatment in the same bath.

[0009] Step 4: During the dyeing process, control the pH of the dyeing working solution to be neutral to slightly alkaline, and raise the temperature to the polyester dyeing temperature according to the conventional heating procedure and keep it at that temperature.

[0010] Step 5: After the insulation is completed, the polyester fabric is washed and then restored to its original state.

[0011] Step 6: After the fabric has been cleaned, it is subjected to color-fixing treatment and then dried by a drying device to obtain antibacterial polyester fabric.

[0012] Preferably, the pre-forming treatment temperature of the polyester fabric is 180-190℃, the processing speed is 20-30m / min, the liquor ratio of the high-temperature and high-pressure dyeing machine is controlled at 1:15-1:20, the heating rate is 1℃ / min, the dyeing and heat preservation temperature is 130-135℃, and the heat preservation time is 40-60min.

[0013] Preferably, the antibacterial finishing agent is a reactive quaternary ammonium salt antibacterial agent, with an addition amount of 15-25 g / L. Nano zinc oxide antibacterial particles are also added to the staining working solution. The nano particles are first ultrasonically dispersed before being added to the working solution. The ultrasonic dispersion power is 200-300 W, and the dispersion time is 10-15 min.

[0014] Preferably, the reduction cleaning uses a cleaning solution made of sodium hydrosulfite and sodium hydroxide, the cleaning temperature is 70-75℃, the cleaning time is 15-20 minutes, and after reduction cleaning, the fabric is neutralized with acetic acid until the pH value of the fabric surface is 6.5-7.5.

[0015] Preferably, the color-fixing treatment uses a cationic polyester color-fixing agent, the color-fixing temperature is 60-70℃, the color-fixing time is 20-30min, and the color-fixed fabric is then finished by a tenter frame with a setting temperature of 160-170℃ and a setting speed of 20-25m / min.

[0016] Preferably, the dyeing process uses low-temperature dyeing instead of high-temperature and high-pressure dyeing, with the dyeing temperature controlled at 80-90°C. A low-temperature dyeing carrier is added to the dyeing working solution, with the carrier added at an amount of 8-12 g / L. Dyeing and antibacterial fixation can be completed without high-pressure conditions.

[0017] Preferably, the wastewater generated from dyeing is recycled after being treated by ultrafiltration and reverse osmosis membranes, with a wastewater recycling rate of not less than 80%. Dispersing and leveling agents and antibacterial finishing agents are added to the recycled working solution at amounts of 1-3 g / L and 2-5 g / L, respectively, to maintain a stable working solution concentration.

[0018] Preferably, a multifunctional textile auxiliary agent with dispersing, leveling and fixing effects is added to the dyeing working solution at a dosage of 10-15 g / L. The high-temperature and high-pressure dyeing machine is intermittently stirred during the heat preservation process, once every 20 minutes, and the stirring speed is 50-80 r / min.

[0019] Preferably, the drying equipment adopts segmented hot air drying, with the first stage drying temperature at 60℃ and holding time at 10 minutes, the second stage drying temperature at 80℃ and holding time at 20 minutes, the third stage drying temperature at 100℃ and holding time at 10 minutes, and the drying temperature of the cloth not exceeding 40℃.

[0020] Preferably, the dyeing working solution also contains nano-titanium dioxide anti-UV additive, which is used in combination with antibacterial finishing agent. After antibacterial dyeing, the fabric is subjected to two-dip and two-padding treatment, with the padding rate controlled at 70% to 80%, and then pre-drying and baking to complete the multi-functional finishing.

[0021] Compared with the prior art, the present invention provides a dyeing process for antibacterial polyester fabrics, which has the following beneficial effects:

[0022] 1. The dyeing process for this antibacterial polyester fabric adopts a process of dyeing and antibacterial finishing in the same bath, combined with the control of neutral to weakly alkaline dye liquor, sodium hydroxide reduction cleaning and acetic acid neutralization process. This not only eliminates the need for a separate antibacterial finishing process and shortens the production process, but also avoids color stains and color variations caused by incompatibility between dyes and antibacterial agents. At the same time, it keeps the pH value of the fabric stably controlled within a suitable range, significantly improving the dyeing uniformity and color fastness of the fabric, and ensuring that the finished product has a soft hand feel.

[0023] 2. This antibacterial polyester fabric dyeing process combines reactive quaternary ammonium salt antibacterial agents with nano antibacterial particles, along with intermittent stirring and segmented hot air drying in a high-temperature and high-pressure dyeing machine. This allows the antibacterial components to form a strong bond with the polyester fibers, effectively solving the problems of easy shedding of antibacterial components and poor washability in conventional processes. This significantly improves the durability of the fabric's antibacterial performance while ensuring dimensional stability and no heat shrinkage or deformation.

[0024] 3. The dyeing process for this antibacterial polyester fabric, combined with ultrafiltration and reverse osmosis recycling technology for dyeing wastewater, can reduce pollutant emissions. It can also achieve multi-functional integration of antibacterial and anti-ultraviolet properties by compounding nano-titanium dioxide additives, making it highly applicable to industrial applications and increasing product added value. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] A dyeing process for antibacterial polyester fabric includes the following steps:

[0027] Step 1: The polyester fabric is first pre-shaped using a hot air setting machine. The pre-shaped temperature of the polyester fabric is 180-190℃, the processing speed is 20-30m / min, the liquor ratio of the high-temperature and high-pressure dyeing machine is controlled at 1:15-1:20, the heating rate is 1℃ / min, the dyeing holding temperature is 130-135℃, and the holding time is 40-60min.

[0028] Step 2: Prepare the dyeing working solution and add disperse dye, dispersing and leveling agent and polyester-specific antibacterial finishing agent to the working solution; the antibacterial finishing agent is a reactive quaternary ammonium salt antibacterial agent, and the addition amount is 15-25 g / L. Nano zinc oxide antibacterial particles are also added to the dyeing working solution. The nano particles are first ultrasonically dispersed before being added to the working solution. The ultrasonic dispersion power is 200-300 W and the dispersion time is 10-15 min.

[0029] Step 3: Place the pre-shaped polyester fabric into a high-temperature and high-pressure dyeing machine and immerse it in the above-mentioned dyeing working solution for dyeing and antibacterial treatment in the same bath.

[0030] Step 4: During the dyeing process, control the pH of the dyeing working solution to neutral to slightly alkaline, and raise the temperature to the polyester dyeing temperature according to the conventional heating procedure and maintain the temperature. The reduction cleaning uses a cleaning solution composed of sodium hydrosulfite and sodium hydroxide, with a cleaning temperature of 70-75℃ and a cleaning time of 15-20 minutes. After reduction cleaning, neutralize the fabric with acetic acid until the pH of the fabric surface is 6.5-7.5. The dyeing process uses low-temperature dyeing instead of high-temperature and high-pressure dyeing, with the dyeing temperature controlled at 80-90℃. A low-temperature dyeing carrier is added to the dyeing working solution at a concentration of 8-12 g / L. Dyeing and antibacterial fixation can be completed without high pressure. The wastewater generated during dyeing is recycled after ultrafiltration and reverse osmosis membrane treatment, with a wastewater recycling rate of not less than 80%. Dispersing and leveling agents and antibacterial finishing agents are added to the recycled working solution at amounts of 1-3 g / L and 2-5 g / L, respectively, to maintain a stable working solution concentration. A multifunctional textile auxiliary agent with dispersing, leveling, and color-fixing functions is added to the dyeing working solution at an amount of 10-15 g / L. During the heat preservation process, the high-temperature and high-pressure dyeing machine is intermittently stirred every 20 minutes at a stirring speed of 50-80 r / min.

[0031] Step 5: After the heat preservation is completed, the polyester fabric is subjected to water washing and reduction cleaning treatment in sequence. The reduction cleaning uses a cleaning solution of sodium hydrosulfite and sodium hydroxide, the cleaning temperature is 70-75℃, and the cleaning time is 15-20 minutes. After reduction cleaning, the fabric is neutralized with acetic acid until the pH value of the fabric surface is 6.5-7.5.

[0032] Step 6: After the fabric has been restored and cleaned, it undergoes a color-fixing treatment and is then dried using a drying device to obtain an antibacterial polyester fabric. The color-fixing treatment uses a cationic polyester color-fixing agent, with a color-fixing temperature of 60-70℃ and a color-fixing time of 20-30 minutes. The color-fixed fabric is then processed by a tenter frame at a setting temperature of 160-170℃ and a setting speed of 20-25 m / min. The drying device uses a segmented hot air drying process: the first stage drying temperature is 60℃, with a holding time of 10 minutes; the second stage drying temperature is 80℃, with a holding time of 20 minutes; and the third stage drying temperature is 100℃, with a holding time of 10 minutes. The temperature at which the fabric is removed from the dryer does not exceed 40℃.

[0033] The dyeing working solution also contains nano-titanium dioxide UV-resistant additives, which are used in combination with antibacterial finishing agents. After antibacterial dyeing, the fabric is subjected to two-dip and two-padding treatments, with the padding rate controlled at 70% to 80%. Then, it is pre-dried and baked to complete the multi-functional finishing.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A process for dyeing of bacteriostatic polyester fabric, characterized in that, Includes the following steps: Step 1: The polyester fabric is first pre-shaped using a hot air setting machine; Step 2: Prepare the dyeing working solution and add disperse dye, dispersing and leveling agent and polyester-specific antibacterial finishing agent to the working solution; Step 3: Place the pre-shaped polyester fabric into a high-temperature and high-pressure dyeing machine and immerse it in the above-mentioned dyeing working solution for dyeing and antibacterial treatment in the same bath. Step 4: During the dyeing process, control the pH of the dyeing working solution to be neutral to slightly alkaline, and raise the temperature to the polyester dyeing temperature according to the conventional heating procedure and keep it at that temperature. Step 5: After the insulation is completed, the polyester fabric is washed and then restored to its original state. Step 6: After the fabric has been cleaned, it is subjected to color-fixing treatment and then dried by a drying device to obtain antibacterial polyester fabric.

2. The bacteriostatic polyester fabric dyeing process according to claim 1, characterized in that: The pre-forming treatment temperature of the polyester fabric is 180-190℃, the processing speed is 20-30m / min, the liquor ratio of the high-temperature and high-pressure dyeing machine is controlled at 1:15-1:20, the heating rate is 1℃ / min, the dyeing and heat preservation temperature is 130-135℃, and the heat preservation time is 40-60min.

3. The bacteriostatic polyester fabric dyeing process according to claim 1, characterized in that: The antibacterial finishing agent is a reactive quaternary ammonium salt antibacterial agent, with an addition amount of 15-25 g / L. Nano zinc oxide antibacterial particles are also added to the staining working solution. The nano particles are first ultrasonically dispersed before being added to the working solution. The ultrasonic dispersion power is 200-300 W, and the dispersion time is 10-15 min.

4. The bacteriostatic polyester fabric dyeing process according to claim 1, characterized in that: The reduction cleaning uses a cleaning solution made of sodium hydrosulfite and sodium hydroxide, with a cleaning temperature of 70-75°C and a cleaning time of 15-20 minutes. After reduction cleaning, the fabric is neutralized with acetic acid until the pH value of the fabric surface is 6.5-7.

5.

5. The bacteriostatic polyester fabric dyeing process as claimed in claim 1, wherein: The color-fixing treatment uses a cationic polyester color-fixing agent, with a color-fixing temperature of 60-70℃ and a color-fixing time of 20-30 minutes. The color-fixed fabric is then finished by a tenter frame with a setting temperature of 160-170℃ and a setting speed of 20-25 m / min.

6. The bacteriostatic polyester fabric dyeing process as claimed in claim 1, wherein: The dyeing process uses low-temperature dyeing instead of high-temperature and high-pressure dyeing. The dyeing temperature is controlled at 80-90℃. A low-temperature dyeing carrier is added to the dyeing working solution at a concentration of 8-12 g / L. Dyeing and antibacterial fixation can be completed without high-pressure conditions.

7. The bacteriostatic polyester fabric dyeing process according to claim 1, characterized in that: The wastewater generated from dyeing is recycled after being treated by ultrafiltration and reverse osmosis membranes. The wastewater recycling rate is not less than 80%. Dispersing and leveling agents and antibacterial finishing agents are added to the recycled working solution at amounts of 1-3 g / L and 2-5 g / L, respectively, to maintain a stable working solution concentration.

8. The bacteriostatic polyester fabric dyeing process as claimed in claim 1, wherein: The dyeing working solution is added with a multifunctional textile auxiliary agent that has the functions of dispersing, leveling and fixing. The amount added is 10-15g / L. The high temperature and high pressure dyeing machine is intermittently stirred during the heat preservation process, once every 20 minutes, and the stirring speed is 50-80r / min.

9. The bacteriostatic polyester fabric dyeing process as claimed in claim 1, wherein: The drying equipment adopts segmented hot air drying. The first stage drying temperature is 60℃ and the holding time is 10 minutes. The second stage drying temperature is 80℃ and the holding time is 20 minutes. The third stage drying temperature is 100℃ and the holding time is 10 minutes. The temperature of the dried cloth after drying is no higher than 40℃.

10. The bacteriostatic polyester fabric dyeing process as claimed in claim 1, wherein: The dyeing working solution also contains nano-titanium dioxide UV-resistant additives, which are used in combination with antibacterial finishing agents. After antibacterial dyeing, the fabric is subjected to two-dip and two-padding treatments, with the padding rate controlled at 70% to 80%. Then, it is pre-dried and baked to complete the multi-functional finishing.