Process for improving color fastness of UV printed fabric

Abstract

The invention belongs to the technical field of textile printing and dyeing, and particularly relates to a UV printed fabric color fastness improving process, which is characterized in that a GD-588 epoxy crosslinking curing agent of American 3M company is mixed with water at normal temperature to prepare a finishing liquid, and the finishing liquid is uniformly coated on a printed fabric to be treated through a roller coating method. A GD-588 epoxy crosslinking curing agent of the American 3M company is adopted, the color fastness of the UV printed fabric is improved to 4-5 levels, treatment is conducted through a roller coating method, finishing liquid is evenly distributed on the fabric, a protective film is formed, combination of dye and fibers is enhanced, the dry and wet friction resistance of the treated fabric is improved, the hand feeling is not affected, it needs to be ensured that the fabric is washed cleanly, and the color fastness of the UV printed fabric is improved. The surface active agent residue is avoided, proper baking conditions are selected, and the roller coating method is simple in process, energy-saving, capable of reducing water washing and free of influence on subsequent processing.

Description

Technical Field

[0001] The invention belongs to the technical field of textile printing and dyeing, and particularly relates to a process for improving the color fastness of UV printed fabrics. Background Art

[0002] At present, with the increasing demand for complexity and diversity of printing patterns in the footwear and apparel market, traditional thermal sublimation transfer technology has high requirements for material selection due to the need to withstand high temperature conditions during its processing, especially for materials such as nylon with poor high temperature resistance. To solve this problem, UV light-curing inkjet printers have gradually become popular because they can achieve complex printing at room temperature. This technology uses ultraviolet light to quickly dry and cure inks containing photosensitizers. It is not only not restricted by materials, but also has high work efficiency and simple process operation. However, this technology has significant defects, namely, the color fastness does not meet the standards, especially under dry friction conditions, the color fastness can usually only reach level 2-3 or lower, which cannot meet the strict requirements of high-end application fields such as footwear for color durability.

[0003] Some existing solutions include treating fabrics with adhesives or fixing agents to improve color fastness, but such methods can make the fabric feel harder and the color may turn yellow, affecting the quality of the final product:

[0004] For example, patent CN104831535B proposes a friction color fastness enhancer based on sulfobetaine-type amphoteric surfactant, cross-linkable epoxy group condensate, polyethylene emulsion and diethylene glycol, and uses a two-dip and two-pad process for treatment. Although this method can effectively improve color fastness, the handle of the treated fabric becomes significantly harder;

[0005] On the other hand, patent CN112709086A uses silicone-modified polyurethane and reactive water-based polyurethane color fastness enhancers and treats the fabric by spraying, which reduces the impact on the feel to a certain extent, but may still cause the fabric to turn yellow, and the spraying method has the problems of waste of treatment agent and uneven spraying.

[0006] In summary, there is an urgent need to develop a UV printed fabric color fastness improvement process that can significantly improve the color fastness of printed fabrics without affecting the original feel and color of the fabric. Summary of the invention

[0007] 1. Technical issues to be resolved

[0008] In order to overcome the problems in the prior art that the dry friction color fastness of UV inkjet printed fabrics is insufficient and the feel and color of the fabric are easily affected during the improvement process, the present invention provides a UV printed fabric color fastness improvement process which can significantly improve the color fastness of the printed fabric without affecting the original feel and color of the fabric.

[0009] (II) Technical solution

[0010] The present invention is achieved through the following technical scheme: The present invention proposes a process for improving the color fastness of UV printed fabrics, using GD-588 epoxy cross-linking curing agent from 3M Company of the United States, mixed with water at room temperature to form a finishing liquid, and the finishing liquid is evenly coated on the printed fabric to be treated by a roller coating method to improve its color fastness.

[0011] Furthermore, GD-588 epoxy cross-linking curing agent from 3M Company of the United States is mixed with water in a ratio of 3% to 10%: 90% to 98% to prepare a finishing liquid capable of improving color fastness.

[0012] Furthermore, the roller coating method comprises the following steps: the printed fabric to be treated is smoothly pulled by the cloth guide roller and enters between the pressure roller and the liquid-carrying roller, the liquid-carrying roller takes up the finishing liquid from the finishing liquid immersed in the liquid pool below, and then the excess finishing liquid is squeezed out by the pressure roller to ensure that the finishing liquid is evenly distributed on the fabric, and the process ends.

[0013] Furthermore, the normal temperature is 20°C to 40°C.

[0014] Furthermore, the pressure applied by the pressure roller is 2KG, and the pressure roller speed is 20m / min.

[0015] Furthermore, the amount of finishing liquid carried by the liquid-carrying roller from the liquid pool is 50% to 70%.

[0016] Furthermore, the fabric further comprises the following steps before improving the color fastness:

[0017] Sampling: Select the printed fabric to be processed;

[0018] Cleaning: Wash the printed fabrics to be treated;

[0019] After the fabric has improved color fastness, the method further comprises the following steps:

[0020] Drying and shaping: After the fabric is stretched and fixed in the stenter, it enters the oven for drying;

[0021] Winding: Wind the dried and shaped fabric onto the cloth roller;

[0022] Testing: Color fastness testing of wound fabrics.

[0023] Furthermore, the oven temperature is 140-180° C., and the drying time is 2-8 min.

[0024] Furthermore, the oven temperature is 140° C. and the drying time is 3 minutes.

[0025] (III) Beneficial effects

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention adopts GD-588 epoxy cross-linking curing agent of 3M Company of the United States to improve the color fastness of UV printed fabrics to level 4-5. Through roller coating treatment, the finishing liquid is evenly distributed on the fabric to form a protective film, which enhances the combination of dye and fiber. The dry and wet friction resistance of the treated fabric is improved, and the hand feel is not affected. It is necessary to ensure that the fabric is clean, avoid surfactant residue, and select appropriate baking conditions. The roller coating process is simple and energy-saving, reduces water washing, and does not affect subsequent processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0029] Figure 1 Flow chart of the roller coating method of the present invention. DETAILED DESCRIPTION

[0030] In this technical solution:

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] A method for improving the color fastness of UV printed fabrics is as follows:

[0033] i. Preparation of finishing liquid: Use GD-588 epoxy cross-linking solid from 3M Company of the United States

[0034] The chemical is mixed with water at a ratio of 3% to 10%: 90% to 98% at room temperature (20°C to 40°C) to prepare a finishing liquid for improving color fastness;

[0035] ii. Fabric preparation: Select UV printed fabrics that need to be treated for color fastness improvement and wash them to eliminate any residual active agents on the fabrics;

[0036] iii. Roller coating: Figure 1As shown, the cleaned fabric is smoothly passed around the cloth guide roller and enters between the pressure roller and the liquid belt roller. The liquid belt roller takes up the finishing liquid from the finishing liquid immersed in the liquid pool below (the amount of finishing liquid taken up by the liquid belt roller from the liquid pool is 50% to 70%), and then the excess finishing liquid is squeezed out by the pressure roller (the pressure applied by the pressure roller is 2KG, and the pressure roller speed is 20m / min), ensuring that the finishing liquid is evenly distributed on the fabric;

[0037] iv. Drying and shaping: The roller-coated fabric is stretched and fixed in a tenter frame, and then placed in an oven at a temperature of 140-180°C for 2-8 minutes to complete drying and shaping;

[0038] v. Winding and testing: Wind the dried and shaped fabric onto the fabric roller, and test the color fastness of the treated fabric to ensure the expected effect.

[0039] Wherein, the oven temperature is 140°C and the drying time is 3 minutes.

[0040] Embodiment 1:

[0041] Recipe preparation:

[0042] In a mixing container, mix 3% of GD-588 epoxy cross-linking curing agent and 97% of water, stir evenly to make a finishing liquid;

[0043] Make sure the water temperature during mixing is around 25°C and not higher than 40°C;

[0044] Fabric preparation:

[0045] Select UV printed warp knitted shoe fabric (polyester) as the treatment object;

[0046] Clean the fabric to remove the surfactant residue and stains on the surface;

[0047] Roller coating:

[0048] The cleaned fabric is smoothly passed around the guide roller and enters the roller coating equipment;

[0049] The solution is brought up from the finishing liquid immersed in the liquid pool below by the liquid-carrying roller, and then the excess solution is squeezed out by the pressure screw to ensure that the solution is evenly distributed on the fabric;

[0050] Control the liquid volume of the liquid roller to 60%;

[0051] The pressure applied by the pressure roller is set to 2KG and the speed is 20m / min;

[0052] Drying and shaping:

[0053] The roller-coated fabric is sent into a tenter frame for stretching and fixing;

[0054] Then put the fabric into an oven at 160°C and dry it for 3 minutes to complete the drying and shaping;

[0055] Winding and testing:

[0056] Winding the dried and shaped fabric onto the fabric roll;

[0057] Use a color fastness tester to test the color fastness of the treated fabric and record the results;

[0058]

[0059] It can be seen from the table that the polyester material has been significantly improved after being treated with the color fastness improvement process described in this solution.

[0060] Embodiment 2:

[0061] Recipe preparation:

[0062] In a mixing container, mix 5% of GD-588 epoxy cross-linking curing agent and 95% of water, stir evenly to make a finishing liquid;

[0063] Make sure the water temperature during mixing is around 25°C and not higher than 40°C;

[0064] Fabric preparation:

[0065] Select UV printed warp knitted shoe fabric (nylon material) as the treatment object;

[0066] Clean the fabric to remove the surfactant residue and stains on the surface;

[0067] Roller coating:

[0068] The cleaned fabric is smoothly passed around the guide roller and enters the roller coating equipment;

[0069] The solution is brought up from the finishing liquid immersed in the liquid pool below by the liquid-carrying roller, and then the excess solution is squeezed out by the pressure screw to ensure that the solution is evenly distributed on the fabric;

[0070] Control the liquid volume of the liquid roller to 70%;

[0071] The pressure applied by the pressure roller is set to 2KG and the speed is 20m / min;

[0072] Drying and shaping:

[0073] The roller-coated fabric is sent into a tenter frame for stretching and fixing;

[0074] Then put the fabric into an oven at 130°C and dry it for 3 minutes to complete the drying and shaping;

[0075] Winding and testing:

[0076] Winding the dried and shaped fabric onto the fabric roll;

[0077] Use a color fastness tester to test the color fastness of the treated fabric and record the results;

[0078]

[0079] It can be seen from the table that the nylon material has significantly improved after being treated with the color fastness improvement process described in this solution.

[0080] In the present invention, the present invention adopts GD-588 epoxy cross-linking curing agent produced by 3M Company of the United States. The curing agent is mainly polyols. After being treated with finishing liquid and dried, it can "bridge" between the dye and the fiber to form a compound, that is, to build a protective film with considerable strength on the surface of the fabric and the fiber. This protective film forms a highly diversified cross-linking system, which makes the combination between the dye and the fiber more firm and effectively prevents the dye from falling off the fiber. This characteristic significantly improves the dry and wet friction performance of the fabric, thereby improving the dry and wet friction resistance quality of the fabric. After such a finishing process, the color fastness of the UV printed fabric can reach 4-5 levels;

[0081] The finishing process adopted by the present invention is a roller coating method, the liquid amount is controlled at 50% to 70%, under normal temperature conditions, the pressure roller applies a pressure of 2KG, the roller speed is 20 meters per minute, and the drying process is dried in an oven at 140-180°C for 2-8 minutes. This roller coating method enables the finishing liquid to be evenly distributed on the surface of the fabric. Compared with the traditional padding method, it does not affect the feel of the fabric. The color fastness test method follows the current GB / T 3920-2008 "Textile Color Fastness Test Abrasion Color Fastness" standard for detection and judgment;

[0082] It should be noted that the fabric to be finished must have been fully cleaned to ensure that there is no surfactant residue. In addition, choosing appropriate baking conditions is crucial for the fabric to be fully baked. Too high a temperature or too long a baking time may reduce the fabric's resistance to dry and wet friction.

[0083] In general, the roller coating process is simple, convenient and energy-saving. It reduces the subsequent washing process, and the treated fabric does not affect the peeling strength of subsequent coating, lamination and other processing.

[0084] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0085] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0086] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0087] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A process for improving the color fastness of UV printed fabrics, characterized in that: The upgrading process is to use GD-588 epoxy cross-linking curing agent from 3M Company of the United States, mix it with water at room temperature to form a finishing liquid, and the finishing liquid is evenly coated on the printed fabric to be treated by roller coating.

2. The process for improving color fastness of UV printed fabrics according to claim 1, characterized in that: The GD-588 epoxy cross-linking curing agent of 3M Company of the United States is mixed with water in a ratio of 3% to 10%: 90% to 98% to prepare the finishing liquid.

3. The process for improving color fastness of UV printed fabrics according to claim 1, characterized in that: The roller coating method comprises the following steps: the printed fabric to be treated is smoothly pulled by the cloth guide roller and enters between the pressure roller and the liquid-carrying roller, the liquid-carrying roller takes up the finishing liquid from the finishing liquid immersed in the liquid pool below, and then the excess finishing liquid is squeezed out by the pressure roller, and the process ends.

4. A process for improving color fastness of UV printed fabrics according to any one of claim 1, characterized in that: The normal temperature is 20°C to 40°C.

5. A process for improving color fastness of UV printed fabrics according to any one of claim 2, characterized in that: The pressure applied by the pressure roller is 2KG, and the pressure roller speed is 20m / min.

6. A process for improving color fastness of UV printed fabrics according to any one of claim 2, characterized in that: The liquid carrying roller carries 50% to 70% of the finishing liquid from the liquid pool.

7. The process for improving color fastness of UV printed fabrics according to claim 1, characterized in that: The fabric also has the following features: The following steps are involved: Sampling: Select the printed fabric to be processed; Cleaning: Wash the printed fabrics to be treated; After the fabric has improved color fastness, the method further comprises the following steps: Drying and shaping: After the fabric is stretched and fixed in the stenter, it enters the oven for drying; Winding: Wind the dried and shaped fabric onto the cloth roller; Testing: Color fastness testing of wound fabrics.

8. The process for improving color fastness of UV printed fabrics according to claim 6, characterized in that: The oven temperature is 140-180° C., and the drying time is 2-8 minutes.

9. The process for improving color fastness of UV printed fabrics according to claim 7, characterized in that: The oven temperature is 140° C. and the drying time is 3 min.

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