Dyeing process of polyethylene composite fabric and its application

Abstract

The present invention provides a dyeing process for a polyethylene composite fabric and an application thereof. The dyeing process comprises: immersing the polyethylene composite fabric in a dye solution, dyeing under a staged heating condition, and then performing post-processing to complete the dyeing process. The staged heating method specifically comprises: heating the dye solution from 40 to 60° C. to 75 to 85° C. for the first time, keeping the temperature for 10 to 20 minutes, heating the solution to 95 to 105° C. for the second time, keeping the temperature for 15 to 25 minutes, and heating the solution to 110 to 125° C. for the third time, keeping the temperature for 25 to 35 minutes. The dyeing process effectively solves the problem of poor dyeability of the polyethylene composite fabric by heating the solution in a staged manner, so that the dyed polyethylene composite fabric has a better coloring effect, and the coloring is uniform, the color is good, and the fastness is high, thereby providing a new process method for dyeing the polyethylene composite fabric.

Description

Technical Field

[0001] The invention belongs to the technical field of textiles, and particularly relates to a dyeing process for a polyethylene composite fabric and an application thereof. Background Art

[0002] With the continuous progress of social economy and the continuous improvement of people's living standards, the textile industry has also been developing rapidly to meet people's material needs. In order to meet market demand, fabrics often need to be dyed. At present, there are two existing dyeing processes: immersion dyeing and spray dyeing. Among them, immersion dyeing is the most common dyeing process in fabric dyeing and has been widely used in industries such as clothing and home textiles.

[0003] The dyeing process for different fabrics is also different. CN114214851A discloses a dyeing process for nylon fabrics, comprising the following steps: open-width washing and pre-shrinking, preparation of dyeing solution, heating, dyeing, color fixing, neutralization, and drying. Before dyeing, the pre-shrinked nylon fabric is subjected to a cylinder hardening treatment to shrink the warp and weft threads of the nylon fabric, so that the warp and weft threads in the warp and weft threads are closely attached and squeezed against each other to achieve densification of the nylon fabric. Without the need for a resin coating, the nylon fabric can achieve excellent stiffness and bone feel. By using an acid leveling agent and an acid dye, the dyeing of the densified nylon fabric is well adapted, without the obstruction of the resin coating. The dyed nylon fabric has a brighter color and is more durable. The subsequent molding process is less restricted, and the application range is wide, making it particularly suitable for making products such as luggage and windbreakers. CN113073441A discloses a jacquard fabric production and dyeing process, which uses a jacquard fabric production and dyeing device, the jacquard fabric production and dyeing device comprising a base and a dyeing device, wherein the dyeing device is provided on the upper surface of the base. This invention solves the problem of simply placing the fabric in a dye solution for immersion and then simply turning the fabric. This dyeing method is too simple, making it difficult for the dye solution to fully penetrate the interior of the fabric, and the dyed fabric will also be unevenly dyed, resulting in poor dyeing effect of the jacquard fabric. It is also difficult to accurately control the contact time between the fabric and the dye solution. Too long a contact time will result in the fabric being dyed too darkly, while too short a contact time will result in the fabric being dyed too lightly. This will not only result in poor dyeing effect of the fabric, but also lead to low dyeing efficiency of the fabric, seriously affecting the production efficiency of the jacquard fabric. CN111235905A discloses a dyeing process for nylon fabrics. The surface of the nylon fabric is treated to increase the roughness of the surface of the nylon fabric and enhance the coloring effect of the nylon fabric. During the dyeing process of the nylon fabric, bubble dyeing and atomized dyeing are used to significantly reduce the amount of dye used in the dyeing process of the nylon fabric, reduce the generation of dye-rich wastewater, reduce the cost of wastewater treatment during the dyeing process of the nylon fabric, and increase the economic benefits of the dyeing of the nylon fabric. During the bubble dyeing process, the dye sprayed from the bubble nozzle is mixed with some dye bubbles. The dye bubbles will explode when they contact the surface of the nylon fabric. The impact of the explosion will cause the dye to splash, so that the dye is more evenly coated on the surface of the nylon fabric. At the same time, the explosion of the dye bubbles will generate a large amount of instantaneous heat, which enhances the coating effect of the dye.

[0004] However, there is currently no dyeing process for fabrics containing polyethylene fibers. The molecules of polyethylene fibers are long-chain linear structures or branched structures, which are typical crystalline polymers with strong chemical stability and are difficult to dye directly. For example, conventional disperse dyes and acid dyes are used for dyeing. Since these dyes have no dyeing groups during dyeing, it is difficult for the dyes to penetrate into the polyethylene fibers, which results in poor dyeing performance of conventional dyeing processes on polyethylene fiber fabrics.

[0005] Therefore, developing a dyeing process for polyethylene composite fabrics that is easy to color and has uniform, firm and good color after coloring is a technical problem that needs to be solved urgently in this field. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a dyeing process for polyethylene composite fabrics and its application. The dyeing process can effectively solve the problem of poor dyeability of polyethylene composite fabrics, so that the dyed polyethylene composite fabrics have a better coloring effect, and the coloring is uniform, the color is good, and the fastness is high, providing a new process method for dyeing polyethylene composite fabrics.

[0007] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a dyeing process for a polyethylene composite fabric, the dyeing process comprising: immersing the polyethylene composite fabric in a dye solution, dyeing under staged temperature increase conditions, and post-processing to complete the dyeing process of the polyethylene composite fabric;

[0009] The staged heating method specifically comprises: heating the dye liquor from 40-60° C. (e.g., 42° C., 44° C., 46° C., 48° C., 50° C., 52° C., 54° C., 56° C., or 58° C.) to 75-85° C. (e.g., 76° C., 77° C., 78° C., 79° C., 80° C., 81° C., 82° C., 83° C., or 84° C.), keeping the temperature for 10-20 min (e.g., 11 min, 12 min, 13 min, 14 min, 15 min, 16 min, 17 min, 18 min, or 19 min), heating the dye liquor to 95-105° C. (e.g., 96° C., 97° C., 98° C., 99° C., The temperature is preferably 100℃, 101℃, 102℃, 103℃ or 104℃, etc.), and kept warm for 15-25min (for example, 16min, 17min, 18min, 19min, 20min, 21min, 22min, 23min or 24min, etc.), and the temperature is raised to 110-125℃ (for example, 112℃, 114℃, 116℃, 118℃, 120℃, 122℃ or 124℃, etc.) for the third time, and kept warm for 25-35min (for example, 26min, 27min, 28min, 29min, 30min, 31min, 32min, 33min or 34min, etc.).

[0010] The dyeing process for polyethylene composite fabrics provided by the present invention first involves immersing the polyethylene composite fabric in a dye liquor, then dyeing the polyethylene composite fabric while the dye liquor is heated in stages, and finally, undergoing post-processing to complete the dyeing process for the polyethylene composite fabric. By limiting the dyeing process to include a staged heating step, and further limiting the heating temperature and holding time for each stage of the staged heating, the present invention ensures that the polyethylene composite fabric dyed using the dyeing process has a good coloring effect, with uniform color, good color, high fastness, and resistance to fading, thereby providing a new process for dyeing polyethylene composite fabrics.

[0011] It should be noted that the "polyethylene composite fabric" mentioned in the present invention refers to a fabric woven from polyethylene fibers and other materials.

[0012] Preferably, the polyethylene composite fabric is woven from polyethylene yarn alone, or woven from polyethylene yarn and other yarns.

[0013] The other yarns include any one of polyester, polyester blended yarn, nylon, nylon blended yarn, cotton or cotton blended yarn, or a combination of at least two thereof.

[0014] Preferably, the polyethylene yarn further comprises polyethylene yarn blended yarn or single polyethylene yarn.

[0015] Preferably, the polyethylene yarn further comprises polyethylene composite fibers. The polyethylene composite fibers are of a core-sheath structure, wherein the core layer of the core-sheath structure comprises any one or a combination of at least two of polyester, polyamide or polypropylene, and the sheath layer of the core-sheath structure is polyethylene.

[0016] Preferably, the core layer is polyester.

[0017] Preferably, the core-sheath structure is a semi-enclosed core-sheath structure or a fully-enclosed core-sheath structure. Preferably, the time for immersing in the dye solution is 1 to 15 minutes, for example, 2 minutes, 3 minutes, 4 minutes, 5 minutes, 6 minutes, 7 minutes, 8 minutes, 9 minutes, 10 minutes, 11 minutes, 12 minutes, 13 minutes or 14 minutes.

[0018] Preferably, the dye liquor comprises water, a dispersant and a disperse dye.

[0019] Preferably, the mass ratio of the disperse dye to water is (1.5-5):1000, for example, 2:1000, 2.5:1000, 3:1000, 3.5:1000, 4:1000 or 4.5:1000.

[0020] Preferably, the mass ratio of the dispersant to water is (0.2-0.5):1000, for example, 0.23:1000, 0.26:1000, 0.29:1000, 0.3:1000, 0.33:1000, 0.36:1000, 0.39:1000, 0.4:1000, 0.43:1000, 0.46:1000 or 0.49:1000, etc.

[0021] Preferably, the other yarns include nylon, and the dye solution further includes an acid dye.

[0022] Preferably, the other yarns include cotton, and the dye liquor further includes a reactive dye.

[0023] Preferably, the other yarn is cationic polyester, and the dye solution further includes a cationic dye.

[0024] Preferably, the pH value of the dye solution is 4-6, for example, 4.2, 4.4, 4.6, 4.8, 5, 5.2, 5.4, 5.6 or 5.8.

[0025] Preferably, the pH value is adjusted by adding glacial acetic acid.

[0026] Preferably, the heating rates of the first heating, the second heating and the third heating are each independently 0.5 to 2°C / min, for example, 0.7°C / min, 0.9°C / min, 1.1°C / min, 1.3°C / min, 1.5°C / min, 1.7°C / min, 1.8°C / min or 1.9°C / min, etc.

[0027] As a preferred technical solution of the present invention, setting the heating rate to 0.5-2°C / min can achieve better dyeing effect of polyethylene composite fabrics. If the heating rate is lower than 0.5°C / min, it will lead to low dyeing efficiency and waste of resources. If the heating rate is higher than 2°C / min, it will lead to poor dyeing uniformity.

[0028] Preferably, the post-processing includes the steps of cooling, washing, drying, shaping and drying.

[0029] Preferably, the temperature of the dye liquor after cooling is 50-90°C, for example, 55°C, 60°C, 65°C, 70°C, 75°C, 80°C, 85°C or 90°C.

[0030] Preferably, the cooling rate is 0.5-2°C / min, such as 0.7°C / min, 0.9°C / min, 1.1°C / min, 1.3°C / min, 1.5°C / min, 1.7°C / min, 1.8°C / min or 1.9°C / min, etc. Preferably, the cleaning is performed with an acidic reducing cleaning agent.

[0031] Preferably, the other yarns include nylon, nylon blended yarn, cotton, cotton blended yarn or cationic polyester, and the step of re-dyeing is further included after the cleaning.

[0032] Preferably, the counterstaining includes any one of acidic counterstaining, reactive counterstaining or cationic counterstaining, or a combination of at least two of them.

[0033] As an optimal technical solution, the dyeing process includes: immersing the polyethylene composite fabric in a dye solution with a pH value of 4 to 6 adjusted by glacial acetic acid for 1 to 15 minutes, heating the dye solution from 40 to 60°C to 75 to 85°C at a heating rate of 0.5 to 2°C / min for the first time, keeping warm for 10 to 20 minutes, heating it to 95 to 105°C for the second time at a heating rate of 0.5 to 2°C / min, keeping warm for 15 to 25 minutes, heating it to 110 to 125°C for the third time at a heating rate of 0.5 to 2°C / min, keeping warm for 25 to 35 minutes, and finally cooling the dye solution to 50 to 60°C at a cooling rate of 0.5 to 2°C / min, washing with an acidic reducing detergent, drying, setting and drying, to complete the dyeing process of the polyethylene composite fabric.

[0034] In a second aspect, the present invention provides a garment, wherein the garment is made from fabric dyed by the dyeing process described in the first aspect.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The dyeing process of the polyethylene composite fabric provided by the present invention first immerses the polyethylene composite fabric in a dye solution, then dyes the polyethylene composite fabric under the condition of staged heating, and finally completes the dyeing process of the polyethylene composite fabric through post-processing; the dyeing process limits the heating mode to staged heating, and further limits the heating temperature and holding time of each stage of the staged heating, so that the dyed polyethylene composite fabric has a good dyeing effect, the color uniformity test is excellent or good, and the polyethylene composite fabric has high color fastness and is not easy to fade. The washing color fastness can reach 3 to 5 levels, the perspiration color fastness can reach 3 to 5 levels, the light color fastness can reach 3 to 5 levels, the dry abrasion color fastness can reach 4 to 5 levels, and the wet abrasion color fastness can reach 3 to 5 levels, thereby providing a new process method for dyeing polyethylene composite fabrics. DETAILED DESCRIPTION

[0037] The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0038] Example 1

[0039] A dyeing process for a polyethylene composite fabric, the dyeing process specifically comprising: immersing a polyethylene composite fabric woven from polyethylene yarn and polyester in a dye solution (comprising disperse dyes (Zhejiang Runtu Co., Ltd., Disperse Black ECO, Disperse Ruby WXF, and Disperse Yellow S-BRL), water, and a dispersant (Zhejiang Runtu Co., Ltd., Repair Agent L)) with a pH value of 5 adjusted by glacial acetic acid for 10 minutes; then placing the dye solution in a high-temperature and high-pressure box; heating the dye solution from 50°C to 80°C at a heating rate of 1.5°C / min for a first time, keeping the temperature for 15 minutes; heating the dye solution to 100°C at a heating rate of 1.5°C / min for a second time, keeping the temperature for 20 minutes; heating the dye solution to 115°C at a heating rate of 1.5°C / min for a third time, keeping the temperature for 30 minutes; and finally cooling the dye solution to 70°C at a cooling rate of 1.5°C / min; taking the dye solution out of the high-temperature and high-pressure box; and washing, spinning, setting, and drying the dye solution to complete the dyeing process for the polyethylene composite fabric.

[0040] Example 2

[0041] A dyeing process for a polyethylene composite fabric, the dyeing process specifically comprising: immersing a polyethylene composite fabric woven from polyethylene yarn and polyester in a dye solution (comprising a disperse dye (Zhejiang Runtu Co., Ltd., Disperse Ruby WXF), water, and a dispersant (Zhejiang Runtu Co., Ltd., Repair Agent L) with a mass ratio of 2:1000:0.3) adjusted by glacial acetic acid and having a pH value of 4 for 5 minutes, then placing the dye solution in a high-temperature and high-pressure box, heating the dye solution from 40°C to 75°C for the first time at a heating rate of 1°C / min, keeping the temperature for 15 minutes, heating the dye solution to 95°C for the second time at a heating rate of 1°C / min, keeping the temperature for 15 minutes, heating the dye solution to 110°C for the third time at a heating rate of 1°C / min, keeping the temperature for 25 minutes, and finally cooling the dye solution to 50°C at a cooling rate of 1°C / min, taking the dye solution out of the high-temperature and high-pressure box, washing, drying, setting, and drying, thereby completing the dyeing process for the polyethylene composite fabric.

[0042] Example 3

[0043] A dyeing process for a polyethylene composite fabric, the dyeing process specifically comprising: immersing a polyethylene composite fabric woven from polyethylene yarn and polyester in a dye solution (comprising a disperse dye (Zhejiang Runtu Co., Ltd., Disperse Yellow S-BRL), water, and a dispersant (Zhejiang Runtu Co., Ltd., Repair Agent L) with a mass ratio of 5:1000:0.5) adjusted by glacial acetic acid and having a pH value of 6 for 5 minutes, then placing the dye solution in a high-temperature and high-pressure box, heating the dye solution from 60°C to 85°C at a heating rate of 1°C / min for a first time, keeping the temperature for 20 minutes, heating the dye solution to 105°C at a heating rate of 2°C / min for a second time, keeping the temperature for 25 minutes, heating the dye solution to 125°C at a heating rate of 2°C / min for a third time, keeping the temperature for 35 minutes, and finally cooling the dye solution to 90°C at a cooling rate of 2°C / min, taking the dye solution out of the high-temperature and high-pressure box, and completing the dyeing process of the polyethylene composite fabric by washing, drying, setting, and drying.

[0044] Example 4

[0045] A dyeing process for a polyethylene composite fabric, which differs from Example 1 in that the heating rates of the first, second, and third heating processes in the staged heating process are all 0.5°C / min, and the other steps and conditions are the same as those in Example 1.

[0046] Example 5

[0047] A dyeing process for a polyethylene composite fabric, which differs from Example 1 in that the heating rates of the first, second, and third heating processes in the staged heating process are all 2°C / min, and the other steps and conditions are the same as those in Example 1.

[0048] Example 6

[0049] A dyeing process for a polyethylene composite fabric, which differs from Example 1 in that the heating rates of the first, second, and third heatings in the staged heating process are all 0.25°C / min, and the other steps and conditions are the same as those in Example 1.

[0050] Example 7

[0051] A dyeing process for a polyethylene composite fabric, which differs from Example 1 in that the heating rates of the first, second, and third heating processes in the staged heating process are all 2.5°C / min, and the other steps and conditions are the same as those in Example 1.

[0052] Comparative Example 1

[0053] A dyeing process for a polyethylene composite fabric is disclosed, which differs from Example 1 in that, during the staged heating process, the dye liquor is directly heated from 50°C to 115°C at a heating rate of 1.5°C / min and kept warm for 65 minutes. The other steps and conditions are the same as those in Example 1.

[0054] Comparative Example 2

[0055] A dyeing process for a polyethylene composite fabric, which differs from Example 1 in that, during the staged heating process, the dye liquor is first heated from 50°C to 80°C at a heating rate of 1.5°C / min, kept warm for 15 minutes, and then heated to 115°C for a second time at a heating rate of 1.5°C / min, and kept warm for 50 minutes. The other steps and conditions are the same as those in Example 1.

[0056] Comparative Example 3

[0057] A dyeing process for a polyethylene composite fabric, which differs from Example 1 in that, during the staged heating process, the dye liquor is first heated from 50°C to 100°C at a heating rate of 1.5°C / min, kept warm for 35 minutes, and then heated to 115°C for a second time at a heating rate of 1.5°C / min, and kept warm for 30 minutes. The other steps and conditions are the same as those in Example 1.

[0058] Comparative Example 4

[0059] A dyeing process for a polyethylene composite fabric, which differs from Example 1 in that, during the heating process, the dye solution is heated from 50°C to 80°C for the first time at a heating rate of 1.5°C / min, kept warm for 5 minutes, heated to 100°C for the second time at a heating rate of 1.5°C / min, kept warm for 10 minutes, and heated to 115°C for the third time at a heating rate of 1.5°C / min, kept warm for 20 minutes. The other steps and conditions are the same as those in Example 1.

[0060] Comparative Example 5

[0061] A dyeing process for a polyethylene composite fabric is different from Example 1 only in that the third heating is not performed, and other steps and conditions are the same as those in Example 1.

[0062] Comparative Example 6

[0063] A dyeing process for a polyethylene composite fabric is provided, which differs from Example 1 only in that the temperature of the dye liquor after the third heating is 130° C., and the other steps and conditions are the same as those in Example 1.

[0064] Performance testing:

[0065] (1) Uniformity: Under standard light source D65, visually observe the color and brightness of the dyed fabric. If the fabric surface has no color difference and the color is uniform, it is excellent; if there are no more than 3 locations per square meter of fabric with color difference or uneven color, it is good; if there are more than 3 locations per square meter of fabric with color difference or uneven color, it is poor.

[0066] (3) Washing color fastness: tested according to the test method provided in JIS L 0844 and evaluated according to the AATCC Gray Scale for Color Change / Staining. There are 5 evaluation levels. The larger the value, the better the color fastness.

[0067] (4) Color fastness to perspiration: Tested according to the test method provided in JIS L 0848 and evaluated according to the AATCC Gray Scale for Color Change / Staining. There are 5 evaluation levels. The larger the value, the better the color fastness.

[0068] (5) Color fastness to light: tested according to the test method provided in JIS L 0842 and evaluated according to the AATCC Gray Scale for Color Change / Staining. There are 5 evaluation levels. The larger the value, the better the color fastness.

[0069] (6) Color fastness to rubbing: The test is carried out according to the test method provided in JIS L 0849, which is divided into a dry test and a wet test. The evaluation is carried out according to the AATCC gray card for color change / staining. There are 5 evaluation levels. The larger the value, the better the color fastness.

[0070] The polyethylene composite fabrics dyed by the dyeing process provided in Examples 1 to 7 and Comparative Examples 1 to 6 were tested according to the above test method. The test results are shown in Table 1:

[0071] Table 1

[0072]

[0073]

[0074] According to the data in Table 1, it can be seen that the dyeing process of the polyethylene composite fabric provided by the present invention has the advantages of uniform coloring, good color, not easy to fade and high fastness.

[0075] Specifically, the color uniformity of the fabric dyed by the dyeing process provided in Examples 1 to 7 is excellent or good, the color fastness to washing is 3 to 5 levels, the color fastness to perspiration is 3 to 5 levels, the color fastness to light is 3 to 5 levels, the color fastness to dry abrasion is 4 to 5 levels, and the color fastness to wet abrasion is 3 to 5 levels.

[0076] By comparing Example 1 and Comparative Examples 1 to 3, it can be found that the dyeing uniformity of the fabric obtained by directly heating the temperature to the target temperature in one step without adopting staged heating (Comparative Example 1) is poor, and the color fastness to washing, color fastness to perspiration, color fastness to light and color fastness to rubbing are also reduced; and although the staged heating is adopted, the color uniformity of the fabrics obtained by dyeing by only carrying out two staged heatings to reach the target temperature (Comparative Examples 2 and 3) is only good, and the color fastness to washing, color fastness to perspiration, color fastness to light and color fastness to rubbing are also reduced.

[0077] By comparing Example 1 and Comparative Example 4, it can be found that the dyed fabric obtained by the shorter holding time during the staged heating process has good color uniformity, and the color fastness to washing, perspiration, light and friction is greatly reduced.

[0078] Further comparison of Example 1 and Comparative Examples 5 to 6 shows that the dyed fabrics obtained by not performing the third heating (Comparative Example 5) or performing three heating times but at a lower final temperature (Comparative Example 6) have poor color uniformity, and are also poor in color fastness to washing, color fastness to perspiration, color fastness to light, and color fastness to rubbing.

[0079] Further comparison of Example 1 and Examples 4 to 7 shows that the color uniformity, washing color fastness, perspiration color fastness, light fastness and rubbing color fastness of the fabric obtained after dyeing under the condition of too high a stage heating rate (Example 7) have all decreased slightly; and in actual operation, although the dyeing uniformity and color fastness of the dyed fabric obtained by the stage heating rate being too slow (Example 6) are good, it will lead to low dyeing efficiency and waste of resources.

[0080] In summary, only by limiting the heating method to stage heating and further limiting the heating temperature and holding time of each stage of the stage heating can the dyed polyethylene composite fabric have a better dyeing effect, with the advantages of uniform, firm and good color.

[0081] The applicant states that while the present invention illustrates a polyethylene composite fabric dyeing process and its application through the above-described embodiments, the present invention is not limited to the above-described process steps, nor does it necessarily rely on the above-described process steps for implementation. Persons skilled in the art should understand that any improvements to the present invention, equivalent substitutions for the raw materials used, additions of auxiliary components, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

Claims

1. A dyeing process for polyethylene composite fabrics, characterized in that: The dyeing process includes: immersing the polyethylene composite fabric in a dye solution, dyeing under staged temperature increase conditions, and post-processing to complete the dyeing process of the polyethylene composite fabric; The staged heating method specifically comprises: heating the dye liquor from 40-60° C. to 75-85° C. for the first time, keeping the temperature for 10-20 minutes, heating the dye liquor to 95-105° C. for the second time, keeping the temperature for 15-25 minutes, and heating the dye liquor to 110-125° C. for the third time, keeping the temperature for 25-35 minutes, thereby completing the staged heating. The polyethylene composite fabric is woven from polyethylene yarn and polyester; The dye liquor comprises water, a dispersant and a disperse dye; The mass ratio of the disperse dye to water is (1.5-5):1000; The mass ratio of the dispersant to water is (0.2-0.5):1000; The heating rates of the first heating, the second heating and the third heating are each independently 0.5-2°C / min.

2. The dyeing process according to claim 1, wherein The time of immersing in the dye solution is 1 to 15 minutes.

3. The dyeing process according to claim 1, wherein The pH value of the dye solution is 4-6.

4. The dyeing process according to claim 3, wherein The pH value was adjusted by adding glacial acetic acid.

5. The dyeing process according to claim 1, characterized in that The post-processing includes the steps of cooling, washing, drying, shaping and drying.

6. The dyeing process according to claim 5, characterized in that The temperature of the dye liquor after cooling is 50-90°C.

7. The dyeing process according to claim 5, characterized in that The cooling rate is 0.5-2°C / min.

8. The dyeing process according to claim 5, characterized in that The cleaning is performed using an acidic reducing cleaning agent.

9. The dyeing process according to claim 5, characterized in that The step of counterstaining is included after the washing.

10. The dyeing process according to claim 9, characterized in that The counterstaining includes any one of acidic counterstaining, reactive counterstaining or cationic counterstaining, or a combination of at least two of them.

11. The dyeing process according to claim 1, characterized in that The dyeing process includes: immersing the polyethylene composite fabric in a dye solution whose pH value is adjusted to 4-6 by adding glacial acetic acid for 1-15 minutes, heating the dye solution from 40-60°C to 75-85°C at a heating rate of 0.5-2°C / min for the first time, keeping the temperature for 10-20 minutes, heating the dye solution to 95-105°C at a heating rate of 0.5-2°C / min for the second time, keeping the temperature for 15-25 minutes, heating the dye solution to 110-125°C at a heating rate of 0.5-2°C / min for the third time, keeping the temperature for 25-35 minutes, and finally cooling the dye solution to 50-60°C at a cooling rate of 0.5-2°C / min, washing with an acidic reducing detergent, drying, setting, and drying, thereby completing the dyeing process of the polyethylene composite fabric.

12. A garment, characterized in that: The clothing is made of fabric dyed by the dyeing process according to any one of claims 1 to 11.

Images