Dyeing and finishing process for improving organic fastness of polyester spandex fabric or pure polyester fabric
By strictly controlling the pre-forming process and optimizing the dyeing and post-treatment processes, the problem of insufficient organic fastness of polyester spandex and pure polyester fabrics was solved, achieving stable fixation of dyes inside the fibers and uniform dyeing, thus improving the quality of textile and footwear materials.
Patent Information
- Application Number
- CN202411458459.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-18
- Publication Date
- 2025-02-18
AI Technical Summary
In traditional dyeing and finishing processes, the organic fastness of polyester spandex and pure polyester fabrics is insufficient, resulting in poor dye penetration and fixation. Furthermore, it is difficult to completely remove unbound dyes and impurities from the fabric surface and inside the fibers, leading to problems such as uneven dyeing and easy fading.
We employ a strictly controlled pre-treatment process, optimized dyeing, and a combination of acid and alkali post-treatment. This process, along with high sublimation, high molecular weight dyes, and low-temperature fixation, ensures the stable fixation of the dye within the fiber. This includes temperature control at 180-210℃, 130-135℃, pH value of 4, 95℃ acidic reduction treatment, and 85℃ alkaline cleaning to avoid high-temperature sublimation and migration.
It significantly improves the organic fastness of polyester spandex and pure polyester fabrics, reduces fading, staining and overflow problems, and enhances the overall quality and dyeing uniformity of textile and footwear materials, reaching level 4-5 of GB/T7074-1997 standard.
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Abstract
Description
Technical Field
[0001] The invention relates to the technical field of textile dyeing and finishing technology, and more specifically to a dyeing and finishing process for improving the organic fastness of polyester-spandex fabrics or pure polyester fabrics. Background Art
[0002] In the field of footwear and clothing, especially in the field of shoe materials, spandex is often selected as a key material due to its excellent elasticity and durability. However, in the traditional dyeing and finishing process system, pre-setting treatment is often treated in isolation, and its operating parameters such as temperature and time are mostly dependent on empirical rules or broad fiber type classification, lacking in-depth analysis and fine adjustment of specific fabric characteristics and dyeing requirements. This extensive pre-setting treatment method leads to uneven heat setting effects of fibers, which directly weakens the penetration ability and fixation effect of dyes into the fiber during the subsequent dyeing process, making organic fastness a major hidden danger; In addition, in the post-dyeing treatment stage, the industry generally tends to adopt the traditional single or mixed treatment method of glacial acetic acid combined with hydrosulfite. However, this method is often difficult to completely remove the unbound dyes and impurities remaining on the surface of the fabric and inside the fiber. These stubborn residues not only damage the visual beauty and tactile experience of the product, but more importantly, they seriously weaken the organic fastness, making the textile footwear very easy to fade, stain and other quality problems during subsequent wearing and washing; What is even more troublesome is that during the finishing process, due to the deficiencies in the aforementioned processing links, the dyes are very likely to sublimate and migrate under high temperature conditions. This phenomenon not only destroys the uniformity and clarity of the dyeing, but also further reduces the dyeing quality and overall performance of the textile footwear materials. Summary of the invention
[0003] The purpose of the present invention is to solve the above technical problems and provide a dyeing and finishing process for improving the organic fastness of polyester-spandex fabrics or pure polyester fabrics.
[0004] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: The present invention provides a dyeing and finishing process for improving the organic fastness of polyester-spandex fabric or pure polyester fabric, wherein the steps of the dyeing and finishing process include pre-setting, dyeing, post-treatment and setting of the polyester-spandex fabric or pure polyester fabric, wherein the polyester-spandex fabric is a mixed textile of polyester and spandex, wherein the temperature during the pre-setting process of the polyester-spandex fabric is 180-210° C.; and the temperature during the pre-setting process of the pure polyester fabric is 160-180° C.; The temperature during the dyeing process is 130-135°C, the duration is 30-60 minutes, the pH value is 4, and high sublimation and polymer dyes are used for dyeing; In the post-treatment process, a two-step method of one acid and one base is adopted, which specifically includes an acid reduction treatment with a high-potential acidic reducing agent at 95° C. for 30 minutes and an alkaline reduction cleaning treatment with a mixture of sodium hydroxide and sodium dithionite at 85° C. for 20 minutes; The temperature during the setting process is ≤130° C., and a polyester-spandex fabric or a pure polyester fabric with improved organic fastness is obtained.
[0005] As a preferred technical solution of the present invention, the shrinkage rate of the polyester-spandex fabric or pure polyester fabric after the pre-forming process is ≤±3%.
[0006] As a preferred technical solution of the present invention, when it comes to polyester-spandex fabrics, the temperature during the pre-setting process is 210°C, and the temperature during the setting process is 130°C.
[0007] As a preferred technical solution of the present invention, the shrinkage rate of the polyester-spandex fabric or the pure polyester fabric after the pre-forming process is ≤3%.
[0008] As a preferred technical solution of the present invention, when it comes to polyester-spandex fabrics, the temperature during the pre-setting process is 210°C, and the temperature during the setting process is 130°C.
[0009] As a preferred technical solution of the present invention, the temperature during the dyeing process is 135° C. and the duration is 50 minutes.
[0010] As a preferred technical solution of the present invention, the high sublimation polymer dye is a mixed dye system comprising disperse dyes, strong dispersing leveling agents and buffered acid.
[0011] As a preferred technical solution of the present invention, the mixing ratio of sodium hydroxide and sodium dithionite is 1:2.
[0012] As a preferred technical solution of the present invention, the pre-treatment in the dyeing process needs to fully deal with oil stains and other impurities.
[0013] A shoe material, wherein the shoe material is selected from any of the above-mentioned polyester-spandex fabrics or pure polyester fabrics.
[0014] The beneficial effects of the present invention are as follows: The present invention proposes a dyeing and finishing process for polyester-spandex and pure polyester fabrics, by strictly controlling pre-setting (polyester-spandex 180-210°C, pure polyester 160-180°C), optimizing dyeing (130-135°C, 20-50 minutes, pH4, using high sublimation, polymer dyes), implementing one acid and one alkali post-treatment (95°C acidic for 30 minutes, 85°C alkaline for 20 minutes), and low-temperature setting (≤130°C). This temperature setting not only avoids the sublimation and migration of the dye at high temperature, but also ensures the stable fixation of the dye inside the fiber, significantly improves the organic fastness of the fabric, reduces fading, staining and overflow problems, and improves the overall quality of textile footwear materials. DETAILED DESCRIPTION
[0015] The present invention provides a dyeing and finishing process for improving the organic fastness of polyester-spandex fabric or pure polyester fabric. The steps of the dyeing and finishing process include pre-setting, dyeing, post-treatment and setting of the polyester-spandex fabric or pure polyester fabric. The polyester-spandex fabric is a mixed textile of polyester and spandex. In the case of the polyester-spandex fabric, the temperature during the pre-setting process is 180-210°C; in the case of the pure polyester fabric, the temperature during the pre-setting process is 160-180°C. The pre-setting temperature should be determined according to the fiber composition and tissue structure of the fabric. Generally speaking, the temperature should be higher than the highest temperature in subsequent processing, but cannot exceed the fiber The specific duration of the pre-setting depends on the thickness, width and heating efficiency of the polyester-spandex fabric or pure polyester fabric. The pre-setting time needs to be long enough to ensure the dimensional stability of the fabric and the heat setting effect of the fiber. However, too long a time will increase energy consumption and reduce production efficiency. Therefore, the pre-setting time of polyester-spandex fabric or pure polyester fabric is usually between 20 and 80 seconds as the best, and the polyester-spandex fabric is preferably 60s to ensure the dimensional stability of the fabric and the heat setting effect of the fiber. The temperature during the dyeing process is 130-135°C, the duration is 30-60 minutes, the pH value is 4, and high sublimation and polymer dyes are used for dyeing; the purpose is to further open the polyester fiber molecules and better allow the dye to be adsorbed and fixed inside the fiber; In the post-treatment process, a two-step method of one acid and one base is adopted, specifically including an acid reduction treatment with a high-potential acidic reducing agent at 95° C. for 30 minutes and an alkaline reduction cleaning treatment with a mixture of sodium hydroxide and sodium dithionite at 85° C. for 20 minutes; a high-potential acidic reducing agent is a chemical substance with strong reducing properties under acidic conditions, and such reducing agents are usually able to lose electrons in a chemical reaction, thereby being oxidized, and reducing other substances to a lower oxidation state; the acid treatment uses a high-potential reducing agent to reduce the fabric at a specific temperature and time, which helps to further open the fiber structure, allowing the dye to more easily enter the fiber and firmly bind, while the subsequent alkaline treatment uses a specific reduction washing formula to further remove unbound dyes and other impurities while controlling the temperature to avoid affecting the color of the fabric, thereby consolidating the fixation effect of the dye; The temperature in the setting process is ≤130°C, and a polyester-spandex fabric or pure polyester fabric with improved organic fastness is obtained. Due to the key role played by the pre-setting treatment and the acid-base treatment in the subsequent intermediate steps, the temperature can be controlled below 130°C (not higher than the dyeing temperature) in the final setting process. This temperature setting not only avoids the sublimation and migration of the dye at high temperature, but also ensures the stable fixation of the dye inside the fiber, thereby significantly improving the organic fastness of the textile shoe material. According to GB / T7074-1997, the organic fastness of the material is measured to be level 4-5.
[0016] Wherein, the shrinkage rate of the polyester-spandex fabric or pure polyester fabric after the pre-forming process is ≤±3%.
[0017] Among them, when it comes to polyester-spandex fabrics, the temperature during the pre-setting process is 210°C, and the temperature during the setting process is 130°C.
[0018] Wherein, the shrinkage rate of the polyester-spandex fabric or pure polyester fabric after the pre-forming process is ≤3%.
[0019] Among them, when it comes to polyester-spandex fabrics, the temperature during the pre-setting process is 210°C, and the temperature during the setting process is 130°C.
[0020] The temperature during the dyeing process is 135° C. and the duration is 50 minutes.
[0021] The high-sublimation, high-molecular dye is a mixed dye system comprising disperse dyes, strong dispersing leveling agents and buffered acid, which helps the dyes to be better adsorbed and fixed on the fibers.
[0022] Wherein, the mixing ratio of sodium hydroxide and sodium dithionite is 1:2.
[0023] Among them, the pre-treatment in the dyeing process needs to fully deal with oil stains and other impurities, usually using a degreasing agent for treatment, which is beneficial to the uniform adsorption and fixation of the dye in the subsequent dyeing process.
[0024] A shoe material, which is selected from any of the polyester-spandex fabrics or pure polyester fabrics described above, and can meet high-demand usage scenarios due to its excellent organic fastness and stability. Example
[0025] Example 1: Dyeing process of medium-light colored polyester-spandex fabric Pre-order stage: Temperature: 200℃ Time: 60 seconds The result: dimensionally stable fabrics with fixed stresses in the fibers.
[0026] Dyeing stage: Dye formula: Disperse blue dye: 0.78 o▪w▪f (relative to material weight) Disperse red dye: 0.22 o▪w▪f (relative to material weight) Strong dispersing and leveling agent: appropriate amount Buffered acid: adjust pH to 4 Temperature: 132°C Time: 30 minutes Result: The dye penetrates evenly into the fiber and the medium and light colors are as expected.
[0027] Post-processing stage: Acid reduction treatment: High potential acid reducing agent: 1% (relative to fabric weight) Temperature: 95℃ Time: 30 minutes Alkaline reduction cleaning treatment: Sodium hydroxide: 2.5 g / l (relative to bath weight of water) Sodium dithionite: 5g / l (relative to bath weight of water) Temperature: 85℃ Time: 20 minutes Result: Unbound dye and impurities are effectively removed and dye fixation is enhanced.
[0028] Establishment stage: Temperature: 128℃ Results: The organic fastness of the material was significantly improved, reaching level 4-5 of GB / T7074-1997 standard.
[0029] Example 2: Dyeing process of medium-dark pure polyester fabric Pre-order stage: Temperature: 170℃ Time: 40 seconds The result: dimensionally stable fabrics with fixed stresses in the fibers.
[0030] Dyeing stage (adjust the formula according to the needs of medium and dark colors): Dye formula: Disperse black dye: 1.8 o▪w▪f (relative to material weight) Disperse red dye: 0.15 o▪w▪f (relative to material weight) Strong dispersing and leveling agent: 0.5% Buffer acid: appropriate amount Temperature: 135℃ Duration: 40 minutes The result: deep dye penetration for rich, rich medium and dark shades.
[0031] The post-processing stage is the same as in Example 1.
[0032] Establishment stage: Temperature: 130℃ Result: The material has excellent organic fastness, reaching level 5 of GB / T7074-1997 standard.
[0033] Example 3: Dark polyester spandex material dyeing process Pre-order stage: Temperature: 210℃ Time: 80 seconds Result: The material is dimensionally stable and the stresses within the fibers are completely fixed.
[0034] Dyeing stage (taking dark formula and adjusting): Dye formula: Disperse black dye: 3.5 o▪w▪f (relative to material weight) Disperse blue dye: 0.2 o▪w▪f (relative to material weight) Strong dispersing and leveling agent: 1% Buffer acid: appropriate amount Temperature: 135℃ Duration: 50 minutes The result: deep and even penetration of dye for rich color.
[0035] The post-processing stage is the same as in Example 1.
[0036] Establishment stage: Temperature: 130℃ Result: The material has extremely high organic fastness, reaching the highest level of GB / T7074-1997 standard.
[0037] Example 4: Dyeing process of special effect polyester spandex material (multi-color mixing) Pre-order stage: Temperature: 205℃ Time: 70 seconds The result: a dimensionally stable material suitable for special effects processing.
[0038] Dyeing stage (using multi-color mixing formula): Dye formula: Disperse orange dye: 0.2 o▪w▪f (relative to material weight) Disperse green dye: 0.15 o▪w▪f (relative to material weight) Disperse violet dye: 0.1 o▪w▪f (relative to material weight) Strong dispersing and leveling agent: 0.8% Buffer acid: appropriate amount Temperature: 133°C Duration: 45 minutes The result: a material with a unique blend of colours, rich and layered.
[0039] The post-processing stage is the same as in Example 1, but the amount of reducing agent may need to be adjusted according to the actual color effect.
[0040] Establishment stage: Temperature: 128℃ Result: The material has good organic fastness and stable color, reaching level 4-5 of GB / T7074-1997 standard, showing a unique visual effect.
[0041] The following table is a comparison table of the prior art and four embodiments:
[0042] This comparison table is intended to demonstrate in more detail the significant advantages of the technology of the present invention in improving the organic fastness of polyester-spandex fabrics or pure polyester fabrics, and to highlight the differences with the prior art.
[0043] The following table is a comparison table of the difference effects between this application and the prior art:
[0044] From the above table, we can see that: 1. In the pre-setting treatment stage of the present invention, the temperature and time are finely adjusted according to the fabric characteristics and dyeing requirements to ensure a stable heat setting effect of the fiber, thereby facilitating the subsequent penetration and fixation of the dye into the fiber.
[0045] 2. In the dyeing process, the present invention uses high sublimation, high molecular dyes, which are particularly suitable for spandex and polyester blended materials, and the dyeing temperature and time are optimized to ensure the best penetration and fixation effect of the dye.
[0046] 3. In the post-processing stage, the present invention adopts an acid-base technology, which can completely remove the unbound dyes and impurities remaining on the fabric surface and inside the fiber, thereby significantly improving the visual beauty and tactile experience of the product, while significantly improving the organic fastness.
[0047] 4. In the finishing process stage, the present invention avoids the sublimation and migration of the dye under high temperature conditions by precisely controlling the temperature, thereby maintaining the uniformity and clarity of dyeing and improving the dyeing quality and overall performance.
[0048] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any mark in the claims should not be regarded as limiting the claims involved.
[0049] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. A dyeing and finishing process for improving the organic fastness of polyester-spandex fabric or pure polyester fabric, the dyeing and finishing process comprising pre-setting, dyeing, post-treatment and setting of the polyester-spandex fabric or pure polyester fabric, the polyester-spandex fabric being a mixed textile of polyester and spandex, characterized in that: For polyester spandex fabrics, the temperature during the pre-setting process is 180-210°C; for pure polyester fabrics, the temperature during the pre-setting process is 160-180°C; The temperature during the dyeing process is 130-135°C, the duration is 30-60 minutes, the pH value is 4, and high sublimation and polymer dyes are used for dyeing; In the post-treatment process, a two-step method of one acid and one base is adopted, which specifically includes an acid reduction treatment with a high-potential acidic reducing agent at 95° C. for 30 minutes and an alkaline reduction cleaning treatment with a mixture of sodium hydroxide and sodium dithionite at 85° C. for 20 minutes; The temperature during the setting process is ≤130° C., and a polyester-spandex fabric or a pure polyester fabric with improved organic fastness is obtained.
2. A dyeing and finishing process for improving the organic fastness of polyester-spandex fabric or pure polyester fabric according to claim 1, characterized in that: The shrinkage rate of the polyester-spandex fabric or pure polyester fabric after the pre-forming process is ≤±3%.
3. A dyeing and finishing process for improving the organic fastness of polyester-spandex fabric or pure polyester fabric according to claim 1 or 2, characterized in that: When treating polyester-spandex fabrics, the temperature during the pre-setting process is 210°C, and the temperature during the setting process is 130°C, so as to obtain polyester-spandex fabrics with improved organic fastness.
4. A dyeing and finishing process for improving the organic fastness of polyester-spandex fabric or pure polyester fabric according to claim 1, characterized in that: The temperature during the dyeing process was 135° C. and the duration was 50 minutes.
5. A dyeing and finishing process for improving the organic fastness of polyester-spandex fabric or pure polyester fabric according to claim 1, characterized in that: The high sublimation polymer dye is a mixed dye system comprising disperse dye, strong dispersing leveling agent and buffered acid.
6. A dyeing and finishing process for improving the organic fastness of polyester-spandex fabric or pure polyester fabric according to claim 1, characterized in that: The mixing ratio of the sodium hydroxide and the sodium dithionite is 1:
2.
7. A dyeing and finishing process for improving the organic fastness of polyester-spandex fabric or pure polyester fabric according to claim 1, characterized in that: The pre-treatment in the dyeing process needs to fully deal with oil stains and other impurities.
8. A shoe material, characterized in that: The shoe material is selected from the polyester-spandex fabric or pure polyester fabric described in any one of claims 1 to 7.