Method for dyeing synthetic fibers, dyed fabric and use thereof

Abstract

The present application relates to a synthetic fiber dyeing method, a dyed fabric and application thereof, the dyeing method comprising: soaking and dyeing synthetic fibers in a vegetable dye dip dyeing solution to obtain dyed fibers; immersing the dyed fibers in silicone oil for heat treatment, then taking out, removing surface silicone oil, soaping, and drying. The present application solves the short board of long dyeing cycle and low production efficiency of traditional process, improves the large-scale production capacity; the obtained dyed product has bright color, and the color purity is better than that of traditional process, which improves the product appearance quality and market competitiveness; without adding extra chemical additives, not only the additive procurement cost and subsequent wastewater treatment energy consumption are reduced, but also the environmental pollution caused by chemical additives is avoided, which meets the demand of sustainable development; the process is simplified, the steps of additive preparation, addition and subsequent residual treatment are omitted, and the production complexity and energy consumption are reduced.

Description

Technical Field

[0001] This invention relates to the field of dyeing technology using natural dyes, and specifically to a method for dyeing synthetic fibers, dyed fabrics, and their applications. Background Technology

[0002] Plant dyes are made from natural materials and are environmentally friendly, hypoallergenic, and pollution-free, making them popular with consumers and possessing broad commercial application prospects. For example, turmeric, which has anti-inflammatory and antibacterial properties, can provide gentle care for the skin when used to dye fabrics. However, conventional synthetic fiber dyeing mostly uses disperse dyes, while dyeing synthetic fibers with plant dyes is more difficult and often requires the use of mordants, textile pretreatment, and other technical means.

[0003] Several technical solutions have been studied for dyeing with plant dyes and have achieved certain results. For example, CN106758352A discloses a method for dyeing polyester fabrics with curcumin. Curcumin is dissolved in a carbon tetrachloride / phenol mixed solution, and sodium dodecylbenzenesulfonate, a surfactant, is added and ultrasonically treated to obtain a transparent dye liquor. The polyester fabric is then immersed in the dye liquor, shaken, and heated to 30-60℃ to complete the dyeing process. This method does not require modification of curcumin, but the introduced surfactant increases the difficulty of treating dye waste liquor. CN12000643A discloses a method for preparing plant-dyed polyester-cotton blended yarn. First, cotton fibers are washed to remove impurities and then cationically modified. The modified cotton fibers are then made into cotton slivers, which are blended with polyester fiber slivers to form yarn. After the yarn is dyed with curcumin dye, it is then dyed with madder dye at high temperature and pressure, and finally dehydrated and dried to obtain the finished product. This method solves the problem of simultaneous dyeing of polyester-cotton blended yarns with plant dyes, resulting in high color fastness and unique color of the finished product; however, the cationic modified solution increases the difficulty of recycling and the process is complex and time-consuming, and it is not applicable to the dyeing of polyester fabrics.

[0004] In an era where textiles are empowering the health industry, the demand for plant-based dyeing is becoming increasingly urgent. Therefore, there is a pressing need for a rapid dyeing method using plant-based dyes that requires no additives. Summary of the Invention

[0005] The purpose of this invention is to first dye synthetic fibers in a plant dyeing solution to obtain dyed fibers, and then, without adding any auxiliaries, to achieve rapid dyeing of synthetic fibers by heat-treating the dyed fibers in silicone oil, thereby simplifying the dyeing process and ensuring that the dyed fabrics have excellent color fastness, uniform color and a high K / S value.

[0006] To achieve the above-mentioned technical objectives, the present invention provides a method for dyeing synthetic fibers, comprising, Synthetic fibers are dyed by soaking them in a plant dye solution to obtain dyed fibers. The dyed fibers are immersed in silicone oil for heat treatment, then removed, the surface silicone oil is removed, soaped, and dried.

[0007] Furthermore, the silicone oil is dimethyl silicone oil and / or phenyl silicone oil.

[0008] Furthermore, the heat treatment is carried out at a temperature of 175-205°C for 5-25 seconds.

[0009] Furthermore, the method for preparing the plant dye impregnation solution includes, The plant and the extract were mixed at a ratio of 0.1-50 g / L and extracted at 30-80℃ for 10-60 min to obtain the plant dye infusion. The plant includes at least one of turmeric, indigo, alkanet root, sappanwood, and shellac.

[0010] Furthermore, the immersion staining is carried out at a temperature of 20-90℃ for 5-60 minutes.

[0011] Furthermore, the removal of surface silicone oil is achieved by water washing.

[0012] Furthermore, the soaping is carried out using a mixed solution of 1-3 g / L sodium carbonate and 1-3 g / L soap powder, and is carried out at a temperature of 50-70°C for 20-50 minutes.

[0013] Furthermore, the synthetic fiber includes at least one of polyester and nylon.

[0014] The present invention also provides a dyed fabric obtained by the above-described synthetic fiber dyeing method.

[0015] The present invention also provides the application of the above-described synthetic fiber dyeing method in fabric dyeing.

[0016] Compared with the prior art, the beneficial effects of the present invention include: This invention achieves rapid dyeing of synthetic fibers by immersing them in silicone oil for heat treatment without adding any auxiliaries, thereby simplifying the dyeing process and ensuring that the dyed fabrics have excellent color fastness, uniform color and high K / S value.

[0017] This process addresses the shortcomings of traditional dyeing techniques, such as long cycles and low production efficiency, thereby enhancing large-scale production capabilities. The resulting dyed products exhibit brighter colors and higher color purity compared to traditional processes, improving product appearance quality and market competitiveness. The elimination of unnecessary chemical auxiliaries reduces auxiliary procurement costs and subsequent wastewater treatment energy consumption, while also avoiding environmental pollution caused by chemical auxiliaries, aligning with sustainable development needs. Furthermore, the simplified process eliminates steps such as auxiliary formulation, addition, and subsequent residue treatment, reducing production complexity and energy consumption.

[0018] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in this application will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0020] Figure 1 Line graphs showing the K / S values ​​of the products obtained in Examples 1-5 and Comparative Example 3 before and after soaping are shown. Figure 2 A bar chart showing the K / S values ​​of the products obtained in Examples 5-11 after soaping is shown; Figure 3 The bar charts showing the K / S values ​​of the products obtained in Examples 4 and 12-15 before and after soaping are shown. Figure 4 The bar charts showing the K / S values ​​of the products obtained in Examples 3 and 16-19 before and after soaping are shown. Figure 5 The bar chart shows the K / S values ​​of the products obtained in Examples 2, 4, 5, and Comparative Examples 1-2 before and after soaping. Figure 6 A bar chart showing the K / S values ​​of the repeatedly dyed product in Example 19 before and after soaping is presented. Figure 7 The bar charts showing the K / S values ​​of the products obtained in Examples 21-25 before and after soaping, along with corresponding photographs, are presented. Detailed Implementation

[0021] Conventional dyeing methods for synthetic fibers are well-established, their core being the matching of specific dyes and processes to the fiber's chemical structure. Polyester dyeing primarily relies on disperse dyes and high-temperature, high-pressure processes. Under approximately 130°C and high pressure, the fiber structure is opened, allowing the disperse dye to penetrate and fix. Nylon uses weakly acidic dyes; the amino groups in the nylon molecular chain can form ionic bonds with the anions in the acidic dyes, achieving dyeing. However, dyeing synthetic fibers with plant dyes such as turmeric presents significantly greater technical challenges than conventional methods, mainly in the following aspects: 1. Low affinity and dyeing rate: Most synthetic fibers (especially polyester) have a compact molecular structure and strong hydrophobicity, while plant dyes usually contain more hydrophilic groups. The lack of natural affinity between the two makes it difficult for the dye to penetrate into the fiber.

[0022] 2. Poor color fastness: Due to the lack of stable bonding, synthetic fibers dyed with plant dyes generally have problems with low color fastness to washing, rubbing, and sunlight.

[0023] 3. Complex dyeing process and poor reproducibility: To achieve good dyeing results, complex processes are often required, such as using specific mordants, high temperature and high pressure. Furthermore, plant dyes have poor batch stability, leading to poor dyeing reproducibility.

[0024] The concept of this invention is that, without adding other auxiliaries, after the synthetic fiber is dyed with plant dye solution, the resulting dyed fiber is immersed in silicone oil for heat treatment. During the process, the silicone oil optimizes the interfacial tension, inhibits dye hydrolysis, and improves dispersion stability, ultimately enhancing color depth and color fastness.

[0025] In view of this, on the one hand, the present invention provides a method for dyeing synthetic fibers, including, Synthetic fibers are dyed by immersing them in a plant dye solution to obtain dyed fibers, wherein the synthetic fibers include at least one of polyester and nylon; The dyed fibers are immersed in silicone oil for heat treatment, then removed, the surface silicone oil is removed, soaped, and dried.

[0026] In some preferred embodiments, the synthetic fibers are soaked and dyed in a plant-based dye solution and then dried. This drying process before the color-fixing reaction ensures operational safety and prevents uneven heating of the textile surface due to moisture evaporation during the color-fixing process, thus improving the uniformity of dyeing.

[0027] In some preferred embodiments, the silicone oil is dimethyl silicone oil and / or phenyl silicone oil. The viscosity of the silicone oil used does not need to be strictly limited, as long as its properties remain stable during heat treatment and stable operation is guaranteed.

[0028] As some preferred embodiments, the heat treatment is carried out at a temperature of 175-205°C for 5-25 seconds.

[0029] As some preferred embodiments, the method for preparing the plant dye impregnation solution includes, The plant and the extract are mixed at a ratio of 0.1-50 g / L and extracted at 30-80℃ for 10-60 min to obtain the plant dye infusion. Extraction at a temperature higher than room temperature can accelerate the diffusion of the dyeing substances in the plant into the liquid phase system.

[0030] The plant includes at least one of turmeric, indigo, alkanet root, sappanwood, and shellac.

[0031] It should be noted that the type of extract is not strictly limited and can be flexibly selected according to the plant selected. For example, it can be at least one of water, ethanol, acetone, ethylene glycol, etc.

[0032] Optionally, the filter residue generated during the preparation of plant dye impregnation solution can be collected and used in the secondary dyeing process of fabrics to improve dyeing uniformity and color depth.

[0033] Optionally, the filter residue generated during the preparation of plant dye impregnation solution can be used for multiple cycles of extraction to prepare dye solution, thereby achieving efficient reuse of raw material resources.

[0034] As some preferred embodiments, the immersion staining is carried out at a temperature of 20-90°C for 5-60 minutes.

[0035] In some preferred embodiments, the removal of surface silicone oil is achieved by water washing. Water washing can remove both surface dimethyl silicone oil and turmeric residue adhering to the fabric surface, effectively reducing uneven dyeing caused by localized over-dyeing.

[0036] As some preferred embodiments, the soaping is carried out using a mixed solution of 1-3 g / L sodium carbonate and 1-3 g / L soap powder, and is carried out at a temperature of 50-70°C for 20-50 minutes.

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the invention, are intended to cover non-exclusive inclusion.

[0039] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] The present invention will be further described in detail below through specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field or in accordance with the product instructions. Reagents or instruments used that do not specify the manufacturer are all conventional products that can be obtained commercially.

[0041] Example 1 A method for dyeing synthetic fibers includes the following steps: S1. Disperse 0.01g of turmeric powder in 100mL of deionized water and extract at a constant temperature of 80℃ for 1h to obtain a plant dye impregnation solution. S2. Add 1g of polyester to 50mL of the plant dye immersion solution obtained in S1, and dye it at a constant temperature of 60℃ for 30min. Then take it out and dry it to obtain the dyed polyester. S3. The dyed polyester was immersed in dimethyl silicone oil at 190°C and a viscosity of 100 mPa·s for 10 seconds to fix the color, and then washed with water to remove the residual dimethyl silicone oil on the surface. S4. Place the product obtained in S3 into a mixed aqueous solution of sodium carbonate and soap powder, both with a concentration of 2 g / L, and soap it at 60°C for 30 min, then dry it.

[0042] Example 2 A method for dyeing synthetic fibers includes the following steps: S1. Disperse 0.1g of turmeric powder in 100mL of deionized water and extract at a constant temperature of 80℃ for 1h to obtain a plant dye impregnation solution. S2. Add 1g of polyester to 50mL of the plant dye immersion solution obtained in S1, and dye it at a constant temperature of 60℃ for 30min. Then take it out and dry it to obtain the dyed polyester. S3. The dyed polyester was immersed in dimethyl silicone oil at 190°C and a viscosity of 100 mPa·s for 10 seconds to fix the color, and then washed with water to remove the residual dimethyl silicone oil on the surface. S4. Place the product obtained in S3 into a mixed aqueous solution of sodium carbonate and soap powder, both with a concentration of 2 g / L, and soap it at 60°C for 30 min, then dry it.

[0043] Example 3 A method for dyeing synthetic fibers includes the following steps: S1. Disperse 0.3g of turmeric powder in 100mL of deionized water and extract at a constant temperature of 80℃ for 1h to obtain a plant dye impregnation solution. S2. Add 1g of polyester to 50mL of the plant dye immersion solution obtained in S1, and dye it at a constant temperature of 60℃ for 30min. Then take it out and dry it to obtain the dyed polyester. S3. The dyed polyester was immersed in dimethyl silicone oil at 190°C and a viscosity of 100 mPa·s for 10 seconds to fix the color, and then washed with water to remove the residual dimethyl silicone oil on the surface. S4. Place the product obtained in S3 into a mixed aqueous solution of sodium carbonate and soap powder, both with a concentration of 2 g / L, and soap it at 60°C for 30 min, then dry it.

[0044] Example 4 A method for dyeing synthetic fibers includes the following steps: S1. Disperse 0.5g of turmeric powder in 100mL of deionized water and extract at a constant temperature of 80℃ for 1h to obtain a plant dye impregnation solution. S2. Add 1g of polyester to 50mL of the plant dye immersion solution obtained in S1, and dye it at a constant temperature of 60℃ for 30min. Then take it out and dry it to obtain the dyed polyester. S3. The dyed polyester was immersed in dimethyl silicone oil at 190°C and a viscosity of 100 mPa·s for 10 seconds to fix the color, and then washed with water to remove the residual dimethyl silicone oil on the surface. S4. Place the product obtained in S3 into a mixed aqueous solution of sodium carbonate and soap powder, both with a concentration of 2 g / L, and soap it at 60°C for 30 min, then dry it.

[0045] Example 5 A method for dyeing synthetic fibers includes the following steps: S1. Disperse 5g of turmeric powder in 100mL of deionized water and extract at a constant temperature of 80℃ for 1h to obtain a plant dye impregnation solution. S2. Add 1g of polyester to 50mL of the plant dye immersion solution obtained in S1, and dye it at a constant temperature of 60℃ for 30min. Then take it out and dry it to obtain the dyed polyester. S3. The dyed polyester was immersed in dimethyl silicone oil at 190°C and a viscosity of 100 mPa·s for 10 seconds to fix the color, and then washed with water to remove the residual dimethyl silicone oil on the surface. S4. Place the product obtained in S3 into a mixed aqueous solution of sodium carbonate and soap powder, both with a concentration of 2 g / L, and soap it at 60°C for 30 min, then dry it.

[0046] Examples 6-11 Compared with Example 5, the difference is that the temperature of the dimethyl silicone oil in step S3 is 175°C, 180°C, 185°C, 195°C, 200°C, and 205°C, respectively.

[0047] Examples 12-15 Compared with Example 4, the difference is that the color-fixing time in dimethyl silicone oil in step S3 is 5s, 15s, 20s and 25s respectively.

[0048] Examples 16-19 Compared with Example 3, the difference is that the isothermal extraction time in step S1 is 1 / 3h, 2 / 3h, 2h and 3h respectively.

[0049] Example 20 A method for dyeing synthetic fibers includes the following steps: S1. Disperse 10g of turmeric powder in 200mL of deionized water and extract at a constant temperature of 80℃ for 1h to obtain a plant dye impregnation solution. S2. Add 1g of nylon to 50mL of the plant dye immersion solution obtained in S1, and dye it for 30min at a constant temperature of 60℃. Then take it out and dry it to obtain the dyed nylon, and collect the residue in the plant dye immersion solution. S3. The dyed nylon was immersed in dimethyl silicone oil at 180°C and with a viscosity of 100 mPa·s for 15 seconds to fix the color, and then washed with water to remove the residual dimethyl silicone oil on the surface. S4. Place the product obtained in S3 into a mixed aqueous solution of sodium carbonate and soap powder, both with a concentration of 2 g / L, and soap it at 60°C for 30 min, then dry it. S5. Add 50 mL of deionized water to the residue collected in S2, and repeat the above extraction, dyeing, fixing and soaping to dye the new nylon. Repeat the collection of residue for dyeing twice, that is, the turmeric powder was dyed a total of three times.

[0050] Example 21 A method for dyeing synthetic fibers includes the following steps: S1. Disperse 5g of turmeric powder in 100mL of deionized water and extract at a constant temperature of 80℃ for 1h to obtain a plant dye impregnation solution. S2. Add 1g of nylon to 50mL of the plant dye immersion solution obtained in S1, and dye it for 30min at a constant temperature of 60℃. Then take it out and dry it to obtain the dyed nylon. S3. The dyed nylon was immersed in dimethyl silicone oil at 180°C and with a viscosity of 100 mPa·s for 15 seconds to fix the color, and then washed with water to remove the residual dimethyl silicone oil on the surface. S4. Place the product obtained in S3 into a mixed aqueous solution of sodium carbonate and soap powder, both with a concentration of 2 g / L, and soap it at 60°C for 30 min, then dry it.

[0051] Example 22 A method for dyeing synthetic fibers includes the following steps: S1. Disperse 5g of indigo powder and 1.25g of reducing agent in 100mL of deionized water, and extract at a constant temperature of 80℃ for 1h to obtain plant dye impregnation solution. S2. Add 1g of nylon to 50mL of the plant dye immersion solution obtained in S1, and dye it for 30min at a constant temperature of 60℃. Then take it out and dry it to obtain the dyed nylon. S3. The dyed nylon was immersed in dimethyl silicone oil at 180°C and with a viscosity of 100 mPa·s for 15 seconds to fix the color, and then washed with water to remove the residual dimethyl silicone oil on the surface. S4. Place the product obtained in S3 into a mixed aqueous solution of sodium carbonate and soap powder, both with a concentration of 2 g / L, and soap it at 60°C for 30 min, then dry it.

[0052] Example 23 A method for dyeing synthetic fibers includes the following steps: S1. Disperse 5g of shellac powder in 100mL of deionized water and extract at a constant temperature of 80℃ for 1h to obtain a plant dye impregnation solution. S2. Add 1g of nylon to 50mL of the plant dye immersion solution obtained in S1, and dye it for 30min at a constant temperature of 60℃. Then take it out and dry it to obtain the dyed nylon. S3. The dyed nylon was immersed in dimethyl silicone oil at 180°C and with a viscosity of 100 mPa·s for 15 seconds to fix the color, and then washed with water to remove the residual dimethyl silicone oil on the surface. S4. Place the product obtained in S3 into a mixed aqueous solution of sodium carbonate and soap powder, both with a concentration of 2 g / L, and soap it at 60°C for 30 min, then dry it.

[0053] Example 24 A method for dyeing synthetic fibers includes the following steps: S1. Disperse 5g of Lithospermum erythrorhizon powder in 100mL of 40% ethanol aqueous solution and extract at a constant temperature of 80℃ for 1h to obtain plant dye impregnation solution. S2. Add 1g of nylon to 50mL of the plant dye immersion solution obtained in S1, and dye it for 30min at a constant temperature of 60℃. Then take it out and dry it to obtain the dyed nylon. S3. The dyed nylon was immersed in dimethyl silicone oil at 180°C and with a viscosity of 100 mPa·s for 15 seconds to fix the color, and then washed with water to remove the residual dimethyl silicone oil on the surface. S4. Place the product obtained in S3 into a mixed aqueous solution of sodium carbonate and soap powder, both with a concentration of 2 g / L, and soap it at 60°C for 30 min, then dry it.

[0054] Example 25 A method for dyeing synthetic fibers includes the following steps: S1. Disperse 5g of sappanwood powder in 100mL of deionized water and extract at a constant temperature of 80℃ for 1h to obtain plant dye impregnation solution. S2. Add 1g of nylon to 50mL of the plant dye immersion solution obtained in S1, and dye it at a constant temperature of 60℃ for 30min. Then take it out and dry it to obtain the dyed polyester. S3. The dyed nylon was immersed in dimethyl silicone oil at 180°C and with a viscosity of 100 mPa·s for 15 seconds to fix the color, and then washed with water to remove the residual dimethyl silicone oil on the surface. S4. Place the product obtained in S3 into a mixed aqueous solution of sodium carbonate and soap powder, both with a concentration of 2 g / L, and soap it at 60°C for 30 min, then dry it.

[0055] Example 26 Compared with Example 25, the difference is that in step S3, dimethyl silicone oil is replaced with phenyl silicone oil, and its K / S value after soaping is basically the same as that of Example 25.

[0056] Comparative Example 1 A method for dyeing synthetic fibers includes the following steps: S1. Disperse 0.5g of turmeric powder in 100mL of deionized water and extract at a constant temperature of 80℃ for 1h to obtain a plant dye impregnation solution. S2. Add 1g of polyester to 50mL of the plant dye immersion solution obtained in S1, and dye it at a constant temperature of 60℃ for 30min. Then take it out and dry it to obtain the dyed polyester. S3. Place the dyed polyester in a mixed aqueous solution of sodium carbonate and soap powder, both with a concentration of 2 g / L, and soap it at 60°C for 30 minutes, then dry it.

[0057] Comparative Example 2 A method for dyeing synthetic fibers includes the following steps: S1. Disperse 0.5g of turmeric powder in 100mL of deionized water and extract at a constant temperature of 80℃ for 1h to obtain a plant dye impregnation solution. S2. Add 1g of polyester and 0.15g of dispersant NNO to 50mL of the plant dye immersion solution obtained in S1, and dye at a constant temperature of 130℃ for 30min. Then take it out and dry it to obtain the dyed polyester. S3. Place the dyed polyester in a mixed aqueous solution of sodium carbonate and soap powder, both with a concentration of 2 g / L, and soap it at 60°C for 30 minutes, then dry it.

[0058] Comparative Example 3 The difference from Example 1 is that the amount of turmeric used in step S1 is 10g.

[0059] Comparative Example 4 The difference from Example 4 is that the temperature of the dimethyl silicone oil in step S3 is 210°C.

[0060] Test case like Figure 1 As shown, the K / S values ​​of the products obtained in Examples 1-5 and Comparative Example 3 before and after soaping were tested. It can be seen that when the extraction concentration is 0.1-50 g / L, the resulting dyeing solution can effectively dye polyester. Although the comparative example is slightly improved compared to Example 5, the increase is not significant.

[0061] like Figure 2 As shown, the K / S values ​​of the products obtained in Examples 5-11 and Comparative Example 4 after soaping were tested. It can be seen that color fixation can be achieved under conditions of 175-205℃. Different temperatures have different effects on the color fixation rate. Among them, the K / S value of the product obtained in Comparative Example 4 (210℃) after soaping is also around 22.

[0062] like Figure 3 As shown, the K / S values ​​of the products obtained in Example 4 and Examples 12-15 before and after soaping were tested. It can be seen that dye fixation can be achieved in the time range of 5-25s, with 10s showing better fixation effect.

[0063] like Figure 4 As shown, the K / S values ​​of the products obtained in Examples 3 and 16-19 before and after soaping were tested. It can be seen that the purpose of extracting turmeric dye can be achieved within an extraction time of 20 min to 3 h.

[0064] like Figure 5 As shown, the K / S values ​​of the products obtained in Examples 2, 4, 5, and Comparative Examples 1-2 before and after soaping were tested. It can be seen that compared with the conventional high-temperature dyeing method for polyester in Comparative Example 2, Examples 2, 4, and 5 do not require the use of additional dispersants and avoid the stringent high-temperature requirements of traditional processes.

[0065] like Figure 6 As shown, the K / S values ​​of the products dyed multiple times in Example 19 before and after soaping were tested. It can be seen that the filter residue produced after the extraction of turmeric dye can be extracted multiple times to prepare dye liquor and achieve dyeing, which effectively improves the utilization rate of raw materials and realizes the efficient recycling of dye resources.

[0066] like Figure 7As shown, the K / S values ​​of the products obtained in Examples 21-25 before and after soaping were tested. It can be seen that the rapid dyeing method of the present invention is applicable to a variety of plant dyes and has good dyeing properties, and has good applicability and application potential.

[0067] In summary, this invention abandons the traditional technical approach of using mordants, modifying reagents, and fabric pretreatment, and innovatively uses dimethyl silicone oil and / or phenyl silicone oil to directly fix the synthetic fibers. Without the need to add various chemical reagents, it can achieve rapid dyeing of curcumin on polyester fabrics. This not only effectively simplifies the dyeing process and reduces the difficulty of dye liquor recovery and treatment, but also ensures that the fabric obtains good dyeing effect and color stability, ultimately achieving green and efficient dyeing of synthetic fibers.

[0068] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for dyeing synthetic fibers, characterized by, include, Synthetic fibers are dyed by soaking them in a plant dye solution to obtain dyed fibers. The dyed fibers are immersed in silicone oil for heat treatment, then removed, the surface silicone oil is removed, soaped, and dried.

2. The synthetic fiber dyeing method according to claim 1, characterized by, The silicone oil is dimethyl silicone oil and / or phenyl silicone oil.

3. The synthetic fiber dyeing method according to claim 1, characterized by, The heat treatment is carried out at a temperature of 175-205℃ for 5-25 seconds.

4. The synthetic fiber dyeing method according to claim 1, characterized by, The method for preparing the plant dye impregnation solution includes, The plant and the extract were mixed at a ratio of 0.1-50 g / L and extracted at 30-80℃ for 10-60 min to obtain the plant dye infusion. The plant includes at least one of turmeric, indigo, alkanet root, sappanwood, and shellac.

5. The synthetic fiber dyeing method according to claim 1, wherein The immersion staining is carried out at a temperature of 20-90℃ for 5-60 minutes.

6. The synthetic fiber dyeing method according to claim 1, characterized in that, The removal of surface silicone oil is achieved by water washing.

7. The synthetic fiber dyeing method according to claim 1, characterized in that, The soaping is performed using a mixed solution of 1-3 g / L sodium carbonate and 1-3 g / L soap powder, and is carried out at a temperature of 50-70℃ for 20-50 minutes.

8. The method for dyeing synthetic fibers according to any one of claims 1-7, characterized in that, The synthetic fiber includes at least one of polyester and nylon.

9. A dyed fabric, characterized in that, The synthetic fiber dyeing method described in any one of claims 1-8 is used to obtain it.

10. The application of a synthetic fiber dyeing method as described in any one of claims 1-8 in fabric dyeing.

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