High-color-fastness balanced type polyester fabric dyeing process
By combining low-temperature plasma pretreatment and β-cyclodextrin dyeing with bio-enzyme cleaning, the health and environmental problems of traditional dyeing processes have been solved, achieving high color fastness and environmentally friendly dyeing effects for polyester fabrics.
Patent Information
- Application Number
- CN202511117083.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-11
- Publication Date
- 2025-11-18
AI Technical Summary
The chemicals used in the traditional dyeing process of pure cotton fabrics are harmful to health, wastewater treatment is difficult, environmental pressure is high, and the dyeing effect is poor.
The process employs a combination of low-temperature plasma pretreatment, β-cyclodextrin staining, and bio-enzyme cleaning, including steps such as refining and desizing, low-temperature plasma surface modification, staining, ultrasonic cleaning, reduction cleaning, and gradient water washing. High-purity nitrogen plasma and bio-enzymes are used to replace traditional strong alkali treatment, increasing the dye adsorption sites and improving color fastness.
It effectively reduces COD emissions from wastewater treatment, improves dyeing uniformity and color fastness, achieves environmentally friendly dyeing with high color fastness, has a floating color removal rate of over 90%, and significantly improves color fastness.
Smart Images
Figure CN120967700A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of textile manufacturing technology, specifically to a high color fastness and uniformity dyeing process for polyester fabrics. Background Technology
[0002] Traditional cotton dyeing processes involve the extensive use of corrosive and toxic chemicals, resulting in cotton fabrics containing residual formaldehyde, carcinogenic or allergenic banned azo dyes, and heavy metal ions such as lead, chromium, cadmium, cobalt, and mercury. These substances pose a threat to human health, especially to clothing worn close to the skin. Furthermore, the dyeing process generates large amounts of wastewater with high pH and chemical oxygen demand (COD), making treatment difficult and costly. It also causes fatal soil salinization, leading to soil compaction and serious environmental damage, placing significant pressure on the ecological environment.
[0003] In view of this, the inventors of this case conducted in-depth research on the above-mentioned problems, which led to the creation of this case. Summary of the Invention
[0004] The purpose of this invention is to address the above-mentioned shortcomings by providing a high color fastness and relatively environmentally friendly high color fastness uniform polyester fabric dyeing process.
[0005] The solution adopted by this invention to solve the technical problem is: a dyeing process for high colorfastness and uniformity of polyester fabric, comprising the following steps:
[0006] S1. Pretreatment: Refining and desizing treatment of polyester fabric;
[0007] S2. Pretreatment: The surface of the pretreated polyester fabric is modified using a low-temperature plasma device.
[0008] S3. Dyeing: Immerse the pretreated polyester fabric in a dye bath at 40℃ at a liquor ratio of 1:8. Increase the temperature to 130℃ at 1.5℃ / min, keep it at that temperature for 40 minutes, and then decrease the temperature to 100℃ at 2℃ / min. Add 1.5-2.0% owf of β-cyclodextrin at 100±2℃, keep it at that temperature for 10 minutes, and then continue to decrease the temperature to 60℃ before draining the liquid.
[0009] S4. Post-treatment: The dyed polyester fabric is subjected to ultrasonic cleaning, reduction cleaning and color fixing in sequence.
[0010] S5, gradient washing and drying.
[0011] Furthermore, in order to remove spinning oil, weaving sizing agents and dust from the fabric and avoid affecting the dyeing uniformity and color fastness, the refining and desizing treatment in S1 involves adding desizing working solution to the dyeing vat at a bath ratio of 1:10, immersing the polyester fabric in the desizing working solution at 65-70℃ for 20 minutes, then steaming at 98℃ for 30 minutes, followed by a three-stage countercurrent water wash at 95℃→80℃→60℃ and then drying.
[0012] Furthermore, to improve the cleaning effect and ensure that the uniformity and color fastness during dyeing are not affected, the desizing working solution comprises: 4-6 g / L scouring agent, 2-3 g / L desizing enzyme, 5-8 g / L hydrogen peroxide, 1 g / L sodium hydroxide, 1-2 g / L chelating dispersant, and 1-1.5 g / L penetrant. The scouring agent emulsifies oil and disperses impurities; the desizing enzyme degrades PVA sizing; the hydrogen peroxide oxidizes starch / acrylate; the chelating dispersant complexes metal ions to prevent cavitation; and the penetrant improves wettability.
[0013] Furthermore, in order to treat the fiber surface, improve the wettability of the fabric, increase the dye adsorption sites, and generate polar groups (-NH2,-COOH) through plasma reaction on the fiber surface; the working gas of the low-temperature plasma equipment in S2 is nitrogen, the gas flow rate is 80-120 sccm, the equipment power is 280-320W, and the processing time is 100-110s.
[0014] Furthermore, polyester fabric has a compact molecular structure and strong hydrophobicity. In order to improve the dyeing rate, the dyeing solution of S3 consists of 3-5% owf disperse dye and 1.2 g / L dispersant, and the pH value of the dyeing solution is adjusted to 5.2±0.2 using a sodium dihydrogen phosphate-citric acid system.
[0015] Furthermore, to thoroughly remove excess dye, the ultrasonic cleaning in step S4 involves placing the polyester fabric in an ultrasonic cleaner with an ultrasonic frequency of 40kHz and an ultrasonic power density of 0.8W / cm². 2 Temperature 50±1℃, processing time 10±0.5min.
[0016] Furthermore, in order to replace sodium hydrosulfite with biological enzymes and wash away the floating color to achieve zero sulfur oxide emissions, the reduction cleaning of S4 is carried out using a compound enzyme agent, which includes laccase and glucose oxidase, and the pH value is controlled at 5.5.
[0017] Furthermore, in order to achieve an activity balance between laccase and glucose oxidase, so as to fully utilize the oxidative decomposition of azo dye chromophores by laccase and the generation of H2O2 by glucose oxidase, thereby improving the enzymatic hydrolysis effect, the mass ratio of laccase to glucose oxidase is 2:1.
[0018] Furthermore, in order to improve the color-fixing effect and take into account environmental protection, the color-fixing process in S4 involves immersing the polyester fabric in a color-fixing solution, which is composed of chitosan quaternary ammonium salt, tea polyphenol-acrylic acid copolymer, nanocellulose crystals, polyether-modified siloxane leveling agent, polycarbodiimide crosslinking agent, and acetic acid aqueous solution.
[0019] Furthermore, to prevent residual moisture from affecting the color-fixing effect of cyclodextrin, the gradient water washing in S5 includes three stages of water washing: 60℃ → 40℃ → room temperature. After water washing, it is dried with hot air at 110℃.
[0020] Compared with the prior art, the present invention has the following advantages:
[0021] (1) This invention innovatively adopts a combination of plasma activation, β-cyclodextrin anchoring and dual-enzyme cleaning process. The surface of polyester fabric is treated by plasma physical activation, then the dyeing molecules are chemically anchored by β-cyclodextrin, and finally the cleaning is completed by biological enzymes, which solves the industry problem that high color depth and high color fastness cannot be achieved simultaneously in polyester dyeing.
[0022] (2) The present invention pre-treats the fabric with low-temperature plasma before dyeing, replacing the traditional strong alkali pre-treatment, effectively preserving the fabric fibers. Moreover, compared with the traditional process, COD emissions are reduced by 85%. The gas used in the low-temperature plasma treatment is high-purity nitrogen with a purity of ≥99.999%. Nitrogen plasma can form micro-nano pits, increasing the specific surface area and increasing the dye adsorption sites. At the same time, the polar group -NH2 is introduced by nitrogen plasma. The polar group can cross-link with β-cyclodextrin to improve color fastness.
[0023] (3) In the dyeing process, β-cyclodextrin is added at 100°C. This temperature is the critical region of glass transition of polyester. The polyester chain segments still have mobility, but the dye migration activity is reduced. At this time, cyclodextrin is added to take advantage of the fiber swelling characteristics of polyester in the glass transition temperature region to encapsulate free dye molecules. The inclusion constant of β-cyclodextrin at 100°C is 2.5-3.2 times higher than that at room temperature, which can effectively block the thermal migration path. In addition, β-cyclodextrin can crosslink with plasma-modified groups, thereby improving color fastness.
[0024] (4) The present invention uses biological enzymes for reduction washing. Laccase and glucose oxidase work together to generate OH free radicals, which can improve the floating color removal rate. Laccase oxidizes and decomposes the chromophores of azo dyes, and glucose oxidase generates H2O2, which strengthens the removal of floating color. The floating color removal rate is greater than 90%. Attached Figure Description
[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0026] Figure 1 A schematic diagram of the delivery mechanism and plasma nozzle;
[0027] Figure 2 This is a schematic diagram of the conveying mechanism;
[0028] Figure 3 This is the main structural view of the conveying mechanism.
[0029] In the figure: 1. Frame; 2. First conveyor roller; 3. Drive disc; 301. Cam groove; 302. Intermittent disc; 4. Cam column; 401. Lever; 5. Drive shaft; 6. Drive wheel; 7. Drive motor; 8. Second conveyor roller; 9. Plasma nozzle; 10. Polyester fabric; 11. Detailed Implementation
[0030] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:
[0031] Example: This example provides a high colorfastness and uniformity dyeing process for polyester fabrics, including the following steps:
[0032] S1. Pretreatment: Refining and desizing treatment of polyester fabric;
[0033] S2. Pretreatment: The surface of the pretreated polyester fabric is modified by low-temperature plasma equipment. On the one hand, nitrogen plasma can form micro-nano pits, increasing the specific surface area and increasing the dye adsorption sites. On the other hand, the nitrogen-containing polar groups introduced by nitrogen plasma increase the nitrogen content by 8 times according to XPS detection. The nitrogen-containing polar groups can combine with dye molecules.
[0034] S3. Dyeing: Immerse the pretreated polyester fabric in a dye bath at 40℃ at a liquor ratio of 1:8. Increase the temperature to 130℃ at 1.5℃ / min, keep it at that temperature for 40 minutes, and then decrease the temperature to 100℃ at 2℃ / min. Add 1.5-2.0% owf β-cyclodextrin at 100±2℃. Here, the absorbance at 650nm can be monitored by online spectrophotometry. Add β-cyclodextrin when the dye uptake rate is >92%. Keep it at that temperature for 10 minutes, and then continue to decrease the temperature to 60℃ before draining the liquid.
[0035] S4. Post-treatment: The dyed polyester fabric is subjected to ultrasonic cleaning, reduction cleaning and color fixing in sequence.
[0036] S5, gradient washing and drying.
[0037] XPS analysis showed that the fiber-dye binding rate was highest at 100℃. The table below shows the fiber-dye binding state at different temperatures of 90℃, 100℃, and 110℃:
[0038] Combined state 90℃ 100℃ 110℃ CN key percentage 5.3％ 8.7％ 6.1％ OH bond percentage 12.1％ 15.9％ 13.5％
[0039] Experiments showed that at 100℃, the hydroxyl groups of β-cyclodextrin formed more hydrogen bonds (OH bonds) with the polar groups of cellulose, resulting in an overall increase of 31%. Furthermore, the inclusion rates of β-cyclodextrin were tested at different temperatures of 90℃, 100℃, and 110℃, and were 71%, 93%, and 82%, respectively. Therefore, the inclusion rate of β-cyclodextrin was highest at 100℃.
[0040] In this embodiment, in order to remove spinning oil, weaving sizing agent and dust from the fabric and avoid affecting the dyeing uniformity and color fastness, the refining and desizing treatment in S1 involves adding desizing working solution to the dyeing vat at a bath ratio of 1:10, immersing the polyester fabric in the desizing working solution at 65-70℃ for 20 minutes to degrade PVA, then steaming hydrogen peroxide working solution at 98℃ for 30 minutes to oxidize starch, followed by a three-stage countercurrent water wash at 95℃→80℃→60℃, and finally neutralizing with 0.5g / L acetic acid and drying.
[0041] In this embodiment, to improve the cleaning effect and ensure that the uniformity and color fastness during dyeing are not affected, the desizing working solution comprises: 4-6 g / L scouring agent, 2-3 g / L desizing enzyme, 5-8 g / L hydrogen peroxide, 1 g / L sodium hydroxide, 1-2 g / L chelating dispersant, and 1-1.5 g / L penetrant, maintaining the pH at 10.5. The scouring agent emulsifies oil and disperses impurities; the desizing enzyme degrades PVA sizing; the hydrogen peroxide oxidizes starch / acrylate; the chelating dispersant complexes metal ions to prevent cavitation; and the penetrant improves wettability. Here, the desizing enzyme is a PVA degrading enzyme, the chelating dispersant is an organophosphonic acid chelating agent, and the penetrant is a fatty alcohol polyoxyethylene ether penetrant.
[0042] In this embodiment, to fully react with nitrogen on the fiber surface to generate polar groups (-NH2,-COOH), thereby improving the wettability of the fabric and increasing the dye adsorption sites, the working gas of the low-temperature plasma equipment in S2 is nitrogen, with a gas flow rate of 80-120 sccm, an equipment power of 280-320W, and a processing time of 100-110s to ensure uniform modification. Modification is insufficient if less than 100 seconds, and can easily damage the fibers if more than 110 seconds. The nitrogen content on the surface of the plasma-treated polyester fabric is ≥5.5 at% (XPS measurement), and the contact angle is ≤30°. Experiments show that when the power is 300W and the gas flow rate is 100 sccm, the nitrogen content on the fiber surface can reach 5.7 at%, which is beneficial for improving the β-cyclodextrin anchoring effect.
[0043] In this embodiment, as Figure 1-3As shown, the fabric is modified in order to transport the fabric; the low-temperature plasma equipment of S2 includes a frame 1, a conveying mechanism, a plasma nozzle 10, a plasma generator, and a moving mechanism. The conveying mechanism is mounted on the frame 1. The moving mechanism includes a slide rail, a slider, and a driver for driving the slider to reciprocate on the slide rail. The slide rail is located above the conveying mechanism, and the length direction of the slide rail is perpendicular to the conveying direction of the conveying mechanism. The plasma nozzle 10 is mounted on the slider and is connected to the plasma generator.
[0044] In this embodiment, in order to drive the first conveying roller 2 and the second conveying roller 9 to rotate intermittently, the conveying mechanism includes a frame 1, the first conveying roller 2, the second conveying roller 9 and the drive motor 8. The first conveying roller 2 and the second conveying roller 9 are respectively rotatably mounted on both sides of the frame 1. There are two drive motors 8. The two drive motors 8 are respectively connected to the first conveying roller 2 and the second conveying roller 9 through an intermittent mechanism to drive the first conveying roller 2 and the second conveying roller 9 to rotate intermittently.
[0045] In this embodiment, in order to drive the first conveying roller 2 and the second conveying roller 9 to rotate intermittently, the intermittent mechanism includes a drive disk 3, an intermittent disk 4, and an intermittent assembly. A drive shaft 5 is rotatably mounted on the frame 1. The drive shaft 5 is connected to the drive motor 8. There are two drive disks 3 and two intermittent disks 4. The two drive disks 3 are coaxially fixedly mounted on both sides of the drive shaft 5, and the two intermittent disks 4 are coaxially fixedly mounted on both sides of the first conveying roller 2 and the second conveying roller 9. The drive disk 3 is located beside the intermittent disk 4. The drive disk 3 drives the intermittent disk 4 to rotate intermittently through the intermittent assembly, thereby driving the first conveying roller 2 and the second conveying roller 9 to rotate intermittently.
[0046] In this embodiment, in order to drive the intermittent disk 4 to rotate, the intermittent assembly includes several cam grooves 301, cam posts 401, paddle blocks 302, and paddle levers 402. The cam grooves 301 are formed by the radial inward recess of the drive disk 3, and the cam posts 401 are formed by the axial outward protrusion of the intermittent disk 4. The diameter of the cam posts 401 is smaller than the groove diameter of the cam grooves 301, and the distance between the center point of the cam posts 401 and the center point of the drive disk 3 is smaller than the diameter of the drive disk 3, so that the intermittent disk 4 can be driven to rotate by the cam posts 401 being inserted into the cam grooves 301, thereby driving the paddle blocks 302 to paddle levers 402.
[0047] The lever 402 is radially arranged on the intermittent disk 4, and the lever block 302 is axially arranged on the drive disk 3. The distance between the center point of the lever block 302 and the center point of the intermittent disk 4 is less than the length of the lever 402, so that the lever 402 is moved by the lever block 302 to drive the intermittent disk 4 to rotate, so that the cam column 401 is engaged in the cam groove 301, thereby driving the intermittent disk 4 to rotate.
[0048] In this embodiment, in order to drive the drive shaft 5 to rotate, the drive motor 8 is mounted on the frame 1, the drive motor 8 has a drive wheel 6 coaxially fixedly mounted on the motor shaft, and the drive shaft 5 has a driven wheel 7 coaxially fixedly mounted on the drive shaft 5. The drive wheel 6 is connected to the driven wheel 7 by a belt to drive the drive shaft 5 to rotate.
[0049] In this embodiment, the drive assembly includes a drive motor 8, a drive wheel 6, and a driven wheel 7. The drive motor 8 is mounted on the frame 1. The drive wheel 6 is coaxially fixedly mounted on the motor shaft of the drive motor 8. The driven wheel 7 is coaxially fixedly mounted on the drive shaft 5. The drive wheel 6 is connected to the driven wheel 7 via a transmission chain.
[0050] This invention intermittently conveys textile fabric 11, and works with a plasma nozzle 10 to perform surface treatment on the textile fabric 11 to improve its subsequent dyeing performance. During operation, to ensure the movement speed of the plasma nozzle 10 matches the conveying speed of the fabric 11, the fabric 11 remains stationary while the plasma nozzle 10 moves from left to right. When the plasma nozzle 10 reaches its rightmost position, a unit amount of fabric 11 is conveyed, allowing the plasma nozzle 10 to begin a new round of surface treatment on the fabric 11. Compared to traditional conveying mechanisms, this method offers higher processing efficiency. Specifically, when the drive shaft 5 rotates, it drives the... When disk 3 rotates, cam post 401 engages with cam groove 301. Rotating disk 3 drives intermittent disk 4 to rotate. When cam groove 301 separates from cam post 401, intermittent disk 4 stops rotating, while disk 3 continues to rotate. Then, lever 302 contacts lever 402, which moves lever 402, causing intermittent disk 4 to rotate again. When lever 302 separates from lever 402, intermittent disk 4 stops rotating again, while disk 3 continues to rotate, causing cam groove 301 to contact cam post 401 again. This achieves intermittent conveying of textile fabric 11, which is very convenient to use.
[0051] In this embodiment, the polyester fabric has a compact molecular structure and strong hydrophobicity. In order to improve the dyeing rate, the dyeing liquor of S3 consists of 3-5% owf disperse dye and 1.2 g / L dispersant. The pH value of the dyeing liquor is adjusted to 5.2±0.2 using a sodium dihydrogen phosphate-citric acid system. The disperse dye is a high sublimation fastness disperse dye, and the dispersant is naphthalenesulfonic acid formaldehyde condensate.
[0052] In this embodiment, to thoroughly remove excess dye, the ultrasonic cleaning in step S4 involves placing the polyester fabric in an ultrasonic cleaner with an ultrasonic frequency of 40kHz and an ultrasonic power density of 0.8W / cm². 2 Temperature 50±1℃, processing time 10±0.5min.
[0053] In this embodiment, to replace sodium hydrosulfite with biological enzymes and remove floating color to achieve zero sulfur oxide emissions, the reduction cleaning in S4 uses a composite enzyme agent, which includes laccase and glucose oxidase. The laccase can be laccase fermented by Aspergillus oryzae, which has better heat resistance than laccase fermented by white rot fungi. Specifically, the laccase concentration is 0.6 g / L, and the glucose oxidase concentration is 0.3 g / L, with the pH value controlled at 5.5. Here, the -NH2 polar group introduced by nitrogen plasma produces a synergistic oxidation effect with laccase / glucose oxidase. Compared with the traditional reduction washing process using sodium hydrosulfite, the floating color removal rate can reach 95%, and the COD emission rate is reduced by 40%.
[0054] In this embodiment, in order to achieve an activity balance between laccase and glucose oxidase, so as to fully utilize the oxidative decomposition of azo dye chromophores by laccase and the generation of H2O2 by glucose oxidase, thereby improving the enzymatic hydrolysis effect, the addition ratio of laccase and glucose oxidase is 2:1.
[0055] In this embodiment, to improve the color-fixing effect while considering environmental protection, the color-fixing process in step S4 employs a high-precision rolling mill, controlling the pressure at 0.3 MPa. The polyester fabric is immersed in the color-fixing solution at a liquor ratio of 1:15, undergoing two dips and two nips, with a pick-up rate of 70%. Overfeeding by 3-5% is used to prevent shrinkage. Then, it is pre-dried at 110℃ for 2 minutes, followed by baking at 150℃ for 1 minute. Here, the color-fixing solution is ultrasonically dispersed before use. The color-fixing solution consists of 35±2% chitosan quaternary ammonium salt, 25±2% tea polyphenol-acrylic acid copolymer, 5±0.5% nanocellulose crystals, 0.2% polyether-modified siloxane leveling agent, 5±1% polycarbodiimide crosslinking agent, 27±2% 10% acetic acid aqueous solution, and 0.1% hydroxyethyl cellulose. Nanocellulose crystals with an aspect ratio >20, preferably 30-50 nm, bridge chitosan quaternary ammonium salt and polycarbodiimide to form an ultra-thin 0.5 μm cross-linked film, improving color fastness without affecting the feel. The fixing solution is prepared fresh before use, with the chitosan quaternary ammonium salt using a 1% acetic acid aqueous solution as the solvent. The nanocellulose crystals are prepared from microcrystalline cellulose via sulfuric acid hydrolysis, with a Zeta potential of -35 mV to -45 mV. The nanocellulose crystals are pre-dispersed in a 1% acetic acid aqueous solution for 30 minutes before use. Here, the long cationic quaternary ammonium salt chain enhances the binding force with hydrophobic fibers, and the nanocellulose fills the fiber gaps, preventing dye leaching. Hydroxyethyl cellulose is used to prevent the nanocellulose crystals from settling.
[0056] In this embodiment, in order to prevent residual moisture from affecting the color-fixing effect of cyclodextrin, the water washing in S5 adopts a gradient water washing method, which involves three stages of water washing: 60°C → 40°C → room temperature. The gradient water washing can prevent the β-cyclodextrin film layer from being cold-cold-induced to break. Then, it is dried with hot air at 110°C.
[0057] The table below compares the technical effects of this application with those of traditional processes (tested according to GB standards):
[0058]
[0059] XPS analysis showed that after plasma treatment, the O / C ratio on the fiber surface increased from 0.25 to 0.41, and the nitrogen content reached 5.7%. After the addition of β-cyclodextrin, the dye thermal migration rate decreased by 62% (HPLC determination).
[0060] This invention innovatively employs a combined process of plasma activation, β-cyclodextrin anchoring, and dual-enzyme cleaning. It physically activates the polyester fabric surface with plasma, then chemically anchors dyeing molecules using β-cyclodextrin, and finally cleans with biological enzymes. This solves the industry problem of the incompatibility between high color depth and high color fastness in polyester dyeing. Pre-treatment of the fabric with low-temperature plasma before dyeing replaces traditional strong alkali pre-treatment, effectively preserving the fabric fibers. Furthermore, compared to traditional processes, COD emissions are reduced by 85%. The low-temperature plasma treatment gas is high-purity nitrogen (≥99.999%). Nitrogen plasma can form micro-nano pits, increasing the specific surface area and dye adsorption sites. Simultaneously, the introduction of polar groups -NH2 through nitrogen plasma allows these groups to cross-link with β-cyclodextrin, improving color fastness and color retention. High color fastness; During the dyeing process, β-cyclodextrin is added at 100℃, which is the critical region of the glass transition of polyester. While polyester chain segments still possess mobility, the dye migration activity is reduced. Adding cyclodextrin at this temperature utilizes the fiber swelling characteristics of polyester in the glass transition temperature range to encapsulate free dye molecules. The inclusion constant of β-cyclodextrin at 100℃ is 2.5-3.2 times higher than at room temperature, effectively blocking thermal migration pathways. Furthermore, β-cyclodextrin can crosslink with plasma-modified groups, thereby improving color fastness. This invention employs bio-enzymes for reductive washing. Laccase and glucose oxidase synergistically generate OH free radicals, which can improve the floating color removal rate. Laccase oxidizes and decomposes the chromophores of azo dyes, and glucose oxidase generates H2O2, enhancing floating color removal, achieving a floating color removal rate greater than 90%.
[0061] The above description is merely an embodiment of the present invention and does not limit the scope of patent protection of the invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.
Claims
1. A high colorfastness and uniformity dyeing process for polyester fabrics, characterized in that: Includes the following steps: S1. Pretreatment: Refining and desizing treatment of polyester fabric; S2. Pretreatment: The surface of the pretreated polyester fabric is modified using a low-temperature plasma device. S3. Dyeing: Immerse the pretreated polyester fabric in a dye bath at 40℃ at a liquor ratio of 1:
8. Increase the temperature to 130℃ at 1.5℃ / min, keep it at that temperature for 40 minutes, and then decrease the temperature to 100℃ at 2℃ / min. Add 1.5-2.0% owf of β-cyclodextrin at 100±2℃, keep it at that temperature for 10 minutes, and then continue to decrease the temperature to 60℃ before draining the liquid. S4. Post-treatment: The dyed polyester fabric is subjected to ultrasonic cleaning, reduction cleaning and color fixing in sequence. S5, gradient washing and drying.
2. The high colorfastness and uniformity polyester fabric dyeing process according to claim 1, characterized in that: The refining and desizing process of S1 involves adding desizing working solution to the dyeing vat at a bath ratio of 1:10, immersing the polyester fabric in the desizing working solution at 65-70℃ for 20 minutes, then steaming at 98℃ for 30 minutes, followed by a three-stage countercurrent water wash at 95℃→80℃→60℃ and then drying.
3. The high colorfastness and uniformity polyester fabric dyeing process according to claim 2, characterized in that: The desizing working solution comprises: 4-6 g / L scouring agent, 2-3 g / L desizing enzyme, 5-8 g / L hydrogen peroxide, 1 g / L sodium hydroxide, 1-2 g / L chelating dispersant, and 1-1.5 g / L penetrant.
4. The high colorfastness and uniformity polyester fabric dyeing process according to claim 1, characterized in that: The low-temperature plasma equipment of S2 uses nitrogen as the working gas, with a gas flow rate of 80-120 sccm, a power of 280-320W, and a processing time of 100-110s.
5. The high colorfastness and uniformity polyester fabric dyeing process according to claim 1, characterized in that: The dyeing solution of S3 consists of 3-5% owf disperse dye and 1.2 g / L dispersant, and the pH value of the dyeing solution is adjusted to 5.2 ± 0.2 using a sodium dihydrogen phosphate-citric acid system.
6. The high colorfastness and uniformity polyester fabric dyeing process according to claim 1, characterized in that: The ultrasonic cleaning process in step S4 involves placing the polyester fabric in an ultrasonic cleaner with an ultrasonic frequency of 40 kHz and an ultrasonic power density of 0.8 W / cm². 2 Temperature 50±1℃, processing time 10±0.5min.
7. The high colorfastness and uniformity polyester fabric dyeing process according to claim 1, characterized in that: The reduction cleaning of S4 is performed using a compound enzyme agent, which includes laccase and glucose oxidase, and the pH value is controlled at 5.
5.
8. The high colorfastness and uniformity polyester fabric dyeing process according to claim 7, characterized in that: The mass ratio of laccase to glucose oxidase is 2:
1.
9. The high colorfastness and uniformity polyester fabric dyeing process according to claim 1, characterized in that: The color-fixing process in S4 involves immersing the polyester fabric in a color-fixing solution, which comprises chitosan quaternary ammonium salt, tea polyphenol-acrylic acid copolymer, nanocellulose crystals, polyether-modified siloxane leveling agent, polycarbodiimide crosslinking agent, and 10% aqueous acetic acid solution.
10. The high colorfastness and uniformity polyester fabric dyeing process according to claim 1, characterized in that: The gradient water washing of S5 includes three stages of water washing: 60℃→40℃→room temperature. After water washing, it is dried with hot air at 110℃.