Coated yarn, preparation method thereof and color regulation type fabric

Abstract

The invention provides a coated yarn, a preparation method thereof and a color control type fabric, the coated yarn is provided with at least two coatings, the colors of the coatings are different, and the solubility parameter difference value delta delta between the adjacent coatings is larger than or equal to 2 (J / cm < 3 >) (1 / 2). According to the invention, at least two layers of coatings with different colors are arranged on the surface of the yarn, one or more layers of coatings can be selectively removed according to the design during application, and the coating with the target color is exposed, so that the fabric comprising the coated yarn has different color designs.

Description

Technical Field

[0001] This invention belongs to the field of functional fabric technology, specifically relating to a coated yarn and its preparation method, and a color-controlled fabric. Background Technology

[0002] In the textile consumption sector, with the continuous upgrading of demand for functional and personalized textiles, traditional single-color or simple printed fabrics can no longer meet the market's pursuit of dynamic and diversified visual effects.

[0003] The current mainstream technologies for achieving multicolor fabrics all have insurmountable defects: 1) Traditional printing or dyeing processes rely on multicolor overprinting or interweaving of different colored yarns. Although they can present fixed multicolor patterns, the colors cannot be dynamically adjusted, and complex patterns require multiple registrations, resulting in high process complexity and low production efficiency; 2) Multi-layer composite fabrics achieve multicolor by bonding different colored films or fabric layers, but generally suffer from weak interlayer bonding and easy peeling, and cannot selectively display the colors of specific layers, resulting in insufficient functional flexibility; 3) Although smart materials such as photochromic and thermochromic materials can achieve color changes, their color rendering effect is strictly limited by environmental factors such as light and temperature, resulting in a narrow range of color changes and poor controllability; 4) Laser engraving technology can only engrave patterns on a single layer and cannot achieve three-dimensional or multi-dimensional color rendering by utilizing the color differences of multi-layer structures.

[0004] In summary, existing technologies cannot simultaneously achieve the selectivity, flexibility, and durability of multi-color displays. Therefore, there is an urgent need to develop a textile material that can selectively present different layers of color through process control, with flexible color combinations and a stable structure. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a coated yarn, a method for preparing the same, and a color-controlled fabric.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a coated yarn having at least two coating layers, each coating layer being a different color, wherein: the difference in solubility parameter between adjacent coating layers Δδ ≥ 2 (J / cm²). 3 )^(1 / 2).

[0008] The solubility parameter difference Δδ between adjacent coatings described in this invention is ≥2 (J / cm²). 3 )^(1 / 2), for example 2 (J / cm 3 )^(1 / 2), 3 (J / cm 3 )^(1 / 2), 4 (J / cm 3 )^(1 / 2), 5 (J / cm 3)^(1 / 2), 6 (J / cm 3 )^(1 / 2), 7 (J / cm 3 )^(1 / 2), 8 (J / cm 3 )^(1 / 2), 9 (J / cm 3 )^(1 / 2), 10 (J / cm 3 )^(1 / 2), 15 (J / cm 3 )^(1 / 2), 20 (J / cm 3 )^(1 / 2), 30 (J / cm 3 )^(1 / 2), 40 (J / cm 3 )^(1 / 2), 50 (J / cm 3 )^(1 / 2), etc.

[0009] The present application can selectively remove one or more coating layers according to design during application, expose the coating layer with the target color, and make the fabric including the coating yarn of the present application present different color designs. The coating yarn of the present application does not penetrate between each coating layer, avoiding the mutual influence of different colors between adjacent coating layers.

[0010] In actual application, the target color can be exposed by removing the unnecessary coating layer by etching, and the color can be adjusted arbitrarily according to different needs. Compared with the traditional printing / dyeing process, the coating yarn of the present application can realize the function of dynamically adjusting the color pattern, and the complex pattern does not need to be printed and dyed multiple times, which is simple and convenient. Compared with the color film, the coating yarn of the present application has strong interlayer bonding force and is not easy to peel off, and can be selectively changed in color. Compared with the photochromic material, the color change range of the coating yarn of the present application is wide and controllable. Compared with the laser engraving process, the coating yarn of the present application has a multi-layer structure, and the color difference can be displayed in three dimensions or multiple dimensions.

[0011] Preferably, the color difference ΔE between adjacent coating layers is ≥2.0, for example, 2.0, 2.2, 2.5, 2.8, 3.0, 3.2, 3.5, 4.0, 4.5, 5, 6, 7, 8, 9, etc.

[0012] In the present application, the calculation method of the color difference ΔE is CIE 1976 (ΔE×ab).

[0013] The color of each coating layer of the coating yarn of the present application has a certain contrast, which can form contrast with the surrounding different colors after the target coating color is exposed.

[0014] The coating yarn provided by the present application comprises a coating with certain laser etching resistance, which can avoid the influence on the coating with target color when removing the unnecessary color by laser etching.

[0015] Preferably, the peeling strength between adjacent coatings is ≥5 N / cm, such as 5 N / cm, 6 N / cm, 7 N / cm, 8 N / cm, 9 N / cm, 10 N / cm, 12 N / cm, 15 N / cm, 20 N / cm, etc.

[0016] Preferably, the peeling strength between the coating close to one side of the yarn and the yarn is ≥5 N / cm, such as 5 N / cm, 6 N / cm, 7 N / cm, 8 N / cm, 9 N / cm, 10 N / cm, 12 N / cm, 15 N / cm, 20 N / cm, etc.

[0017] The coating yarn provided by the present application simultaneously loads at least two different color functional coatings, and the functional coatings have high binding force with the yarn and between the functional coatings, and are not easy to fall off.

[0018] Preferably, the thickness of each layer of the coating is independently selected from 5-50 μm, such as 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, etc.

[0019] Preferably, the total thickness of the coating of the coating yarn is ≤200 μm, such as 200 μm, 180 μm, 160 μm, 150 μm, 140 μm, 120 μm, 100 μm, 80 μm, 60 μm, 50 μm, 20 μm, 10 μm, etc.

[0020] Preferably, the composition of each layer of the coating independently comprises a base resin and a dye.

[0021] Preferably, the base resin comprises a thermoplastic resin or a light-cured UV resin, preferably comprises any one or a combination of at least two of polyurethane resin, polyester resin, polyacrylate resin, polyurethane-acrylate hybrid resin, epoxy resin or polyvinyl alcohol resin.

[0022] Preferably, the base resin needs to have the following properties:

[0023] Preferably, the base resin used by the adjacent coating layers has a good adhesion, preferably the peeling strength between them is ≥5 N / cm, such as 5 N / cm, 6 N / cm, 7 N / cm, 8 N / cm, 9 N / cm, 10 N / cm, 12 N / cm, 15 N / cm, 20 N / cm, etc., to avoid the disadvantage of easy peeling.

[0024] Preferably, the base resin used by the coating layer close to the base yarn has a good adhesion with the base yarn, preferably the peeling strength between them is ≥5 N / cm, such as 5 N / cm, 6 N / cm, 7 N / cm, 8 N / cm, 9 N / cm, 10 N / cm, 12 N / cm, 15 N / cm, 20 N / cm, etc.

[0025] Preferably, the difference in solubility parameter Δδ between the base resins used by the adjacent coating layers is ≥2 (J / cm 3 )^(1 / 2), such as 2 (J / cm 3 )^(1 / 2), 3 (J / cm 3 )^(1 / 2), 4 (J / cm 3 )^(1 / 2), 5 (J / cm 3 )^(1 / 2), 6 (J / cm 3 )^(1 / 2), 7 (J / cm 3 )^(1 / 2), 8 (J / cm 3 )^(1 / 2), 9 (J / cm 3 )^(1 / 2), 10 (J / cm 3 )^(1 / 2), 15 (J / cm 3 )^(1 / 2), 20 (J / cm 3 )^(1 / 2), 30 (J / cm 3 )^(1 / 2), 40 (J / cm 3 )^(1 / 2), 50 (J / cm 3 )^(1 / 2), etc., to avoid the penetration and mixing of different colors between the adjacent layers.

[0026] Meanwhile, the base resin described in the present application has laser etching resistance, to avoid affecting the target color coating when etching to remove unnecessary colors.

[0027] Preferably, the visible light transmittance of the base resin used by each coating layer is independently ≥30%, such as 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, etc., to ensure that the dye included therein can be clearly visible, avoiding the influence of the light transmittance of the resin on the color of the dye.

[0028] Preferably, the dye is selected from inorganic or organic dyes, including but not limited to azo dyes, phthalocyanine blue, iron oxide red, etc., and the color can cover the visible light spectrum, such as red, orange, yellow, green, blue, indigo, violet, or special effects, such as fluorescence or pearlescent.

[0029] Preferably, in each of the coating layers, the amount of dye added is independently selected from 3-10% of the mass of the matrix resin, for example, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, etc.

[0030] In a second aspect, the present invention provides a method for preparing coated yarn as described in the first aspect, the method comprising: applying at least two layers of coatings of different colors to the surface of a base yarn by a layer-by-layer coating method to obtain the coated yarn.

[0031] Preferably, the preparation method includes:

[0032] S1. Pre-treat the base yarn;

[0033] S2. By coating and drying layer by layer, at least two layers of coatings of different colors are applied to the surface of the pretreated base yarn to obtain the coated yarn.

[0034] Preferably, the base yarn can be a monofilament or a multifilament fiber, such as polyester, nylon, cotton or modal, and is first subjected to surface pretreatment to improve the adhesion of the coating.

[0035] Preferably, the pretreatment method includes plasma treatment and / or chemical grafting treatment.

[0036] Preferably, the plasma treatment method includes: cleaning the surface of the base yarn using Ar / O2 mixed gas plasma to remove organic contaminants and increase surface roughness, so that the contact angle of the base yarn surface is ≤30°.

[0037] Preferably, the chemical grafting treatment method includes grafting treatment using a silane coupling agent (such as KH550) or a cationic surfactant to make the yarn surface positively charged, which facilitates the adhesion of subsequent coating materials. In particular, anionic coating materials can be stably adhered to the surface of the base yarn.

[0038] Preferably, the present invention employs a step-by-step coating method to apply at least two layers of coatings of different colors to the base yarn. The preferred step-by-step coating method includes: drying after each coating and then applying the next coating.

[0039] Preferably, the coating method includes dip coating, spray coating, or microgravure roller coating.

[0040] Preferably, the thickness of a single coating layer is 5-50 μm, such as 5 μm, 6 μm, 8 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, etc., and preferably the total thickness of the coating is ≤200 μm, such as 200 μm, 180 μm, 160 μm, 150 μm, 140 μm, 120 μm, 100 μm, 80 μm, 60 μm, 50 μm, 20 μm, 10 μm, etc.

[0041] Preferably, drying (or curing) is performed after each coating. The drying (or curing) temperature is preferably 60-120°C, such as 60°C, 70°C, 80°C, 90°C, 100°C, 110°C, 120°C, etc. When the base resin is a UV resin, curing is performed using ultraviolet light irradiation. Preferably, the energy density of the ultraviolet light curing is 500-1500 mJ / cm². 2 For example, 500mJ / cm 2 600 mJ / cm 2 800 mJ / cm 2 1000 mJ / cm 2 1200 mJ / cm 2 1500 mJ / cm 2 wait.

[0042] Thirdly, the present invention provides a color-controlled fabric, wherein the warp and / or weft yarns of the color-controlled fabric are selected from the coated yarns described in the first aspect.

[0043] The fabric provided by this invention can be laser-etched, and the coated yarn can be precisely displayed with the target color by controlling the number of etching layers. It is applicable to fields such as smart textiles, personalized clothing, decorative fabrics and anti-counterfeiting labels.

[0044] Fourthly, the present invention provides a method for preparing a color-controlled fabric as described in the third aspect, the method comprising:

[0045] (1) The coated yarn described in the first aspect is used as warp and / or weft yarns to make a greige fabric;

[0046] (2) The fabric is flattened;

[0047] (3) The flattened fabric is etched and colored using a laser;

[0048] (4) After etching is completed, post-processing is performed to obtain the color-controlled fabric.

[0049] In this invention, the woven fabric is flattened to maintain a smooth surface, providing a uniform working surface for subsequent laser etching. Simultaneously, this invention selectively strips away the coating color through laser etching, exposing only the target layer color, enabling single-area multi-color display or patterned color combination display. The preparation method provided by this invention is simple, controllable, and low-cost, making it suitable for large-scale industrial production.

[0050] In step (1) of this invention, the coated yarn in the fabric can be used as warp or weft yarn and interwoven with ordinary yarn or coated yarn of the same type to form the fabric. The weaving parameters need to meet the following requirements:

[0051] Preferably, the tension fluctuation of the weaving is ≤ ±5 N (e.g., ±5 N, ±4 N, ±3 N, ±2 N, ±1 N, etc.) to ensure uniform weaving tension.

[0052] Preferably, the fabric has a plain weave, twill weave, or satin weave structure, and the warp / weft density is preferably controlled within the range of 40-120 threads / 10cm, such as 40 threads / 10 cm, 50 threads / 10 cm, 60 threads / 10 cm, 80 threads / 10 cm, 100 threads / 10 cm, 120 threads / 10 cm, etc.

[0053] Preferably, the weaving process can reduce the speed of the guide rollers and / or increase the lubricant spraying to avoid severe friction causing the surface coating to peel off.

[0054] Preferably, the fabric obtained by the weaving process needs to be flattened to eliminate surface unevenness and provide a smooth surface for subsequent laser etching.

[0055] Preferably, in step (2), the flattening process includes pre-pressing, fine pressing, and cooling and shaping in sequence.

[0056] Preferably, the pre-compression temperature includes 80-100℃, such as 80℃, 82℃, 85℃, 88℃, 90℃, 92℃, 95℃, 100℃, the pressure is 0.1-0.3 MPa, such as 0.1 MPa, 0.15 MPa, 0.2 MPa, 0.25 MPa, 0.3 MPa, etc., and the speed is 5-10 m / min, such as 5 m / min, 6 m / min, 7 m / min, 8 m / min, 9 m / min, 10 m / min; the fabric is first pre-compressed to remove wrinkles.

[0057] Preferably, the temperature of the fine pressing includes 25-30℃, such as 25℃, 26℃, 27℃, 28℃, 29℃, and 30℃; the pressure is 0.2-0.5 MPa, such as 0.2 MPa, 0.25 MPa, 0.3 MPa, 0.35 MPa, 0.4 MPa, 0.45 MPa, and 0.5 MPa; and the speed is 3-5 m / min, such as 3 m / min, 3.5 m / min, 4 m / min, 4.5 m / min, and 5 m / min. Using cold pressing rollers to flatten the fabric a second time can reduce the surface roughness of the fabric. Preferably, the roughness is ≤0.5 μm, such as 0.5 μm, 0.4 μm, 0.3 μm, 0.2 μm, and 0.1 μm.

[0058] Preferably, the cooling and shaping temperature is 15-20℃, such as 15℃, 16℃, 17℃, 18℃, 19℃, 20℃, etc., to cool the fabric temperature to room temperature and fix the flattened structure.

[0059] After flattening, a portion of the coating is selectively removed using a high-energy-density laser, exposing the coating with the target color to achieve the desired graphic or color design. In the laser etching and color development process used in this invention, the parameters of the laser or color development process include:

[0060] Preferably, in step (3), the etching and color development method includes layer etching based on the target color, and preferably the laser wavelength used for etching is selected based on the absorption peak of the etched layer.

[0061] In this invention, the wavelength of the laser or the wavelength used for etching and color development is selected according to the absorption spectrum of the coating material to be removed. This invention only provides illustrative examples. For instance, if a PU coating needs to be removed by laser and its absorption peak is at 355 nm, then ultraviolet laser etching is selected. If a polyamide coating needs to be removed and its absorption peak is at 532 nm, then green laser etching is selected. This invention will not provide detailed examples; it is sufficient to achieve the goal of removing the coating.

[0062] Preferably, in step (3), the power of the laser is 5-50 W (continuous laser, such as 5 W, 10 W, 15 W, 20 W, 25 W, 30 W, 35 W, 40 W, 45 W, 50 W, etc.) or 1-10 mJ (pulsed laser, such as 1 mJ, 2 mJ, 5 mJ, 6 mJ, 8 mJ, 10 mJ, etc.), the scanning rate is 100-1000 mm / s, such as 100 mm / s, 200 mm / s, 400 mm / s, 500 mm / s, 600 mm / s, 800 mm / s, 1000 mm / s, etc., and the spot diameter is 0.05-0.5 mm, such as 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc.

[0063] In this invention, the power of the laser is sufficient to strip the coating without damaging the remaining coating, and the scanning rate is sufficient to ensure relatively complete etching while avoiding "burning through the underlying layer". If the scanning rate is too fast, the etching will be incomplete; if the scanning rate is too slow, the underlying layer will easily be "burned through". The spot diameter can be determined according to the fineness of the target color area. The laser scanning path is designed according to the target pattern and color.

[0064] Meanwhile, in this invention, the laser is used for etching and color development. In order to accurately expose the target color coating, the parameters of the laser need to be adjusted layer by layer to remove unwanted coatings, which can ensure that each layer is completely peeled off and avoid affecting the target coating.

[0065] During the laser etching process, an infrared sensor can be introduced to monitor the fabric surface temperature, ensuring that the fabric surface temperature is ≤80℃ to avoid thermal damage.

[0066] Preferably, after etching and color development, post-processing is performed. The preferred post-processing method includes using compressed air to remove the peeled coating debris, then using warm water (neutral detergent, 30-40℃, such as 30℃, 32℃, 35℃, 38℃, 40℃, etc.) to wash away residual coating debris, and finally drying. The preferred drying temperature is 40-60℃, such as 40℃, 42℃, 45℃, 48℃, 50℃, 52℃, 55℃, 60℃, etc., and the air velocity is 1-3 m / s, such as 1 m / s, 1.5 m / s, 2 m / s, 2.5 m / s, 3 m / s, etc.

[0067] In this invention, by utilizing a combination of multi-layer color coating, directional weaving, surface flattening, and laser etching processes, excess coatings can be selectively removed using the high energy density of lasers, exposing the target coating color, thereby achieving dynamic control and personalized design of fabric color. Moreover, the method is simple and easy to implement.

[0068] Fifthly, the present invention provides the application of the coated yarn described in the first aspect or the color-controlled fabric described in the third aspect in smart textile fabrics, apparel fabrics or anti-counterfeiting labels.

[0069] Compared with the prior art, the present invention has the following beneficial effects:

[0070] (1) Multi-color adjustability: By setting at least two coatings with different colors on the surface of the yarn, when applying it, one or more coatings can be selectively removed according to the design to expose the coating with the target color, so that the fabric including the coated yarn of the present invention presents different color designs.

[0071] (2) High color stability: The coated yarn provided by the present invention avoids color mixing by selecting the coating. At the same time, the coating has excellent bonding force between the coating and between the coating and the yarn. It has excellent water resistance and still has excellent color fastness after washing.

[0072] (3) The preparation method is simple and controllable: The preparation method of the coated yarn provided by the present invention is simple and easy to implement. The target color can be exposed by removing the unwanted coating through etching or other methods.

[0073] (4) Strong designability: The color-controlled fabric provided by the present invention can be designed and processed according to different needs. Only laser etching is needed to expose the target color. It can also modify the color and other designs on the completed pattern design, which has strong designability.

[0074] (5) Environmental protection: The present invention preferably uses water-based resin as the matrix resin, which can reduce VOC emissions, and laser etching does not cause chemical reagent pollution. Detailed Implementation

[0075] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0076] Unless otherwise specified, the raw materials involved in the following specific embodiments of the present invention are all conventional materials in the art, and can be purchased from commercially available products. Some raw material information is as follows:

[0077] (1) Matrix resin:

[0078] Waterborne polyurethane resin: δ≈22 (J / cm) 3 )^(1 / 2), purchased from Guangzhou Ruilin New Materials Co., Ltd., model number RL-8302;

[0079] Waterborne polyacrylate resin: δ≈20 (J / cm) 3)^(1 / 2), purchased from Covestro, model Bayhydrol XP2470;

[0080] Waterborne polyester resin: δ≈20 (J / cm) 3 )^(1 / 2), purchased from Shanghai Shuaike Chemical Co., Ltd., model SK9613;

[0081] Waterborne polyurethane-acrylate hybrid resin: δ≈22 (J / cm) 3 )^(1 / 2), purchased from Taiping Yumingcheng Trading Company, Xiangcheng District, model AA-8730S;

[0082] Waterborne epoxy resin: δ≈24 (J / cm) 3 )^(1 / 2), purchased from Zhejiang Anbang New Materials, model AB-EP-20;

[0083] Polyethylene resin: δ≈18 (J / cm) 3 )^(1 / 2), purchased from Sinopec Yangzi Petrochemical, model YEC-5505;

[0084] Polyamide resin: δ≈23 (J / cm3)^(1 / 2), purchased from DSM, model Akulon® K224-HG6;

[0085] (2) Pigment

[0086] Red azo dyes, blue phthalocyanine dyes, yellow dyes, orange dyes, green dyes, and purple dyes: all purchased from Clariant.

[0087] Example 1

[0088] This embodiment provides a double-layer color-coated yarn and its preparation method.

[0089] (1) Basic yarn pretreatment

[0090] Polyester low elasticity yarn (DTY, fineness 150 D, tensile strength 4.5 cN / dtex) was selected and treated with plasma (Ar / O2=3:1, power 100 W, treatment time 3 min), the surface contact angle was reduced from 95° to 28°;

[0091] (2) Blue base coat

[0092] A water-based polyacrylate resin was used, and blue phthalocyanine dye (concentration of 8 wt%) was added to obtain the base slurry. The base yarn was coated by micro-gravure roller coating (100 lines / cm of anilox roller, coating thickness of 15 μm), and dried at 100℃ for 5 min to form a blue coating.

[0093] (3) Red surface coating

[0094] A surface slurry was obtained by adding red azo dye (5 wt%) to water-based polyurethane resin. The slurry was then coated using a micro-gravure roller coating method (100 lines / cm on the anilox roller, 10 μm coating thickness). The coating was dried at 80°C for 3 min to form a red coating, thus obtaining the coated yarn.

[0095] The solubility parameter difference Δδ between the surface and the bottom layers is 3 (J / cm³). 3 )^(1 / 2).

[0096] Example 2

[0097] This embodiment provides a double-layer color-coated yarn and its preparation method.

[0098] The difference from Example 1 is that, in this example, by replacing the resin used in the blue underlayer with a water-based polyester resin, the solubility parameter difference Δδ between the surface layer and the underlayer is 2 (J / cm). 3 )^(1 / 2).

[0099] Example 3

[0100] This embodiment provides a double-layer color-coated yarn and its preparation method.

[0101] The difference from Example 1 is that, in this example, by replacing the resin used in the blue underlayer with water-based epoxy resin (drying method: pre-drying at 100°C for 3 min + curing at 120°C for 5 min), the peel strength between the underlayer and the yarn is 5 N / cm (Example 3).

[0102] Examples 4-6

[0103] This embodiment provides a double-layer color-coated yarn and its preparation method.

[0104] The difference from Example 1 is that in this example, by replacing the dye, the bottom layer has different colors, specifically purple dye (Example 4), yellow dye (Example 5), and green dye (Example 6).

[0105] Example 7

[0106] This embodiment provides a three-layer color-coated yarn and its preparation method.

[0107] (1) Basic yarn pretreatment

[0108] Polyester low-elasticity yarn (DTY, fineness 150 D, tensile strength 4.5 cN / dtex) was selected and plasma treated (He / O2=1:1, power 120 W, treatment time 4 min).

[0109] Then, grafting was performed using a 3% KH570 aqueous solution at pH 9 and 70°C for 15 min, which reduced the surface contact angle from 90° to 35°.

[0110] (2) Red base coat

[0111] A water-based epoxy resin was used, and 3 wt% red azo dye was added to obtain a slurry. The slurry was coated using a micro-gravure roller coating method (250 lines / cm of anilox roller, coating thickness of 10 μm). The coating was pre-dried at 100℃ for 3 min and then cured at 120℃ for 5 min to form a red coating.

[0112] (3) Orange intermediate coating

[0113] A waterborne polyurethane-acrylate hybrid resin was used, and 3 wt% orange dye was added to obtain a slurry. The slurry was applied by dip coating with an immersion time of 3 s, a fabric lifting rate of 1.5 m / min, a doctor blade pressure of 0.15 MPa, and a coating thickness of 8 μm. The slurry was pre-dried at 90℃ for 3 min and then cured at 110℃ for 3 min to form an orange coating.

[0114] (4) Yellow surface coating

[0115] A water-based polyester resin was used, with 3 wt% yellow dye added. The coating was applied by spraying (air pressure 0.4 MPa, nozzle-to-yarn distance 15 cm, spray volume 15 mL / min) to form a coating layer with a thickness of 5 μm. After spraying, the coating was dried at 80℃ for 4 min and cured at 100℃ for 2 min to obtain the coated yarn.

[0116] Comparative Example 1

[0117] This comparative example provides a double-layer color-coated yarn and its preparation method.

[0118] The difference from Example 1 is that, in this comparative example, the resin used in the blue underlayer was replaced with a waterborne polyurethane-acrylate hybrid resin, so that the solubility parameter difference Δδ between the surface layer and the underlayer was 0 (J / cm). 3 )^(1 / 2).

[0119] Comparative Example 2

[0120] This comparative example provides a double-layer color-coated yarn and its preparation method.

[0121] The difference from Example 1 is that, in this comparative example, the resin used for the blue underlayer was replaced with polyamide resin, so that the peel strength between the underlayer and the yarn was 1 N / cm.

[0122] Comparative Example 3

[0123] This comparative example provides a double-layer color-coated yarn and its preparation method.

[0124] The difference from Example 1 is that, in this comparative example, the resin used for the red surface layer is replaced with polyethylene resin.

[0125] Performance Test 1

[0126] The performance of the coated yarns provided in Examples 1-7 and Comparative Examples 1-3 was tested using the following methods:

[0127] (1) Peel strength 1: The peel strength between the coating and the yarn is tested according to the GB / T 2791 test standard;

[0128] (2) Peel strength 2: According to the GB / T 2791 test standard, the peel strength between the substrate and the adjacent coating is tested;

[0129] (3) Interlayer penetration: Slice and observe (optical microscope, magnification 100x) to confirm whether there is color mixing between adjacent coatings, observe ≥10 samples;

[0130] (4) Wash resistance: After 50 standard washes, the color fastness of the coating is tested according to the test standard published in GB / T 3921-2008.

[0131] The test results are as follows:

[0132] Table 1

[0133]

[0134] As can be seen from the embodiments and performance tests, the coated yarn provided by the present invention has at least two different colored coatings with obvious color contrast. At the same time, the coatings and yarns have excellent adhesion, and the coatings themselves have excellent color fastness to washing. Furthermore, the permeability between the coatings is small, so it will not cause color contamination between the coatings.

[0135] Application Example 1

[0136] This application example provides a color-controlled fabric and its preparation method.

[0137] (1) Using the coated yarn provided in Example 1 as the warp yarn (60 warp threads / 10 cm) and ordinary polyester yarn as the weft yarn (40 weft threads / 10 cm), a plain weave fabric (120 g / m²) was woven on a rapier loom. 2 );

[0138] (2) Flattening process, including:

[0139] Pre-compression: Hot roller temperature 90℃, pressure 0.2 MPa, speed 8 m / min;

[0140] Precision pressing: cold press roller temperature 28℃, pressure 0.3 MPa, speed 4 m / min;

[0141] Cooling and setting: Cooling roller temperature 18℃, final fabric surface roughness Ra=0.4μm;

[0142] (3) Laser etching and color development

[0143] The "LOGO" pattern (line width 0.2 mm) was drawn using CAD software. A UV laser etching machine (wavelength 355 nm, power 20 W, spot diameter 0.1 mm, scanning speed 300 mm / s) was used to target the surface polyurethane coating. The power was adjusted to 20 W. After scanning, the PU layer was completely peeled off, exposing the underlying blue acrylic coating.

[0144] (4) Post-processing

[0145] Debris is removed by compressed air, and the fabric is washed with warm water (35℃, neutral detergent) and dried to obtain a color-controlled fabric with a red logo and a blue background.

[0146] Performance Test 2

[0147] The performance of the color-controlled fabric obtained from the corresponding use case was tested using the following method:

[0148] (1) Color contrast: The color of the coating was detected using a colorimeter, and ΔE was calculated using the CIE 1976 (ΔE×ab) formula. The results are as follows:

[0149] Red (RGB 255,0,0), blue (RGB 0,0,255), ΔE=5, visually distinct;

[0150] (2) Washability: Tested according to the published test standard GB / T4265-2014, the results are as follows:

[0151] The fabric provided in Application Example 1 of this invention, after 50 standard washes, showed no fading of the logo edge and a color retention rate of ≥90%, demonstrating excellent washability.

[0152] (3) Laser precision: The minimum line width of the pattern of the color-controlled fabric provided in Example 1 of this invention is 0.2 mm, with no burrs or over-cutting.

[0153] The applicant declares that the technical solution of this invention is illustrated through the above embodiments, but this invention is not limited to the above process steps, that is, it does not mean that this invention must rely on the above process steps to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of the raw materials used in this invention, additions of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of this invention.

Claims

1. A coated yarn characterized in that, The coated yarn has at least two layers of coating, each layer of coating having a different color, wherein the difference in solubility parameter between adjacent layers of coating is Δδ ≥ 2 (J / cm 3 )^(1 / 2).

2. The coated yarn according to claim 1, characterized in that, a color difference ΔE between adjacent coating layers ≥ 2.0; and / or, a peeling strength between adjacent coating layers ≥ 5 N / cm; and / or, a peeling strength between a coating layer close to the yarn and the yarn ≥ 5 N / cm.

3. Coated yarn according to claim 1 or 2, characterized in that, a thickness of each layer of the coating layer is independently selected from 5-50 μm; preferably, a total thickness of the coating layers included in the coating yarn is ≤ 200 μm.

4. Coated yarn according to any of claims 1-3, characterized in that, a composition of each layer of the coating layer independently includes a base resin and a dye; preferably, a visible light transmittance of the base resin included in each layer of the coating layer is independently ≥ 30%; preferably, the base resin includes a thermoplastic resin or a light-cured UV resin, preferably includes any one or a combination of at least two of a polyurethane resin, a polyester resin, a polyacrylate resin, a polyurethane-acrylate hybrid resin, an epoxy resin or a polyvinyl alcohol resin; preferably, in each layer of the coating layer, an added amount of the dye is independently selected from 3-10% of a mass of the base resin.

5. A process for the production of a coated yarn as claimed in any one of claims 1 to 4, characterized in that, the preparation method includes: using a layer-by-layer coating method to dispose at least two layers of coating layers with different colors on a surface of a base yarn to obtain the coating yarn.

6. The preparation method according to claim 5, characterized in that, the preparation method includes: S1. pretreating a base yarn; S2. using a layer-by-layer coating and drying method to dispose at least two layers of coating layers with different colors on a surface of the pretreated base yarn to obtain the coating yarn; preferably, the pretreatment method includes a plasma treatment and / or a chemical grafting treatment.

7. The preparation method according to claim 6, characterized in that, the coating method includes dip coating, spray coating or micro-gravure roll coating; preferably, a thickness of a single layer of coating is 5-50 μm, and preferably a total thickness of the coating layers is ≤ 200 μm.

8. A color-controllable fabric, characterized by, the warp yarn and / or the weft yarn of the color-controllable fabric is selected from the coating yarn according to any one of claims 1-4.

9. A method of producing a color-controllable fabric according to claim 8, characterized by, the preparation method includes: (1) using the coating yarn according to any one of claims 1-4 as a warp yarn and / or a weft yarn to make a gray fabric; (2) performing a flattening treatment on the gray fabric; (3) using a laser to perform etching color development on the flattened gray fabric; (4) after the etching is completed, performing a post-treatment to obtain the color-controllable fabric; preferably, in step (2), the flattening treatment method includes sequentially performing a pre-pressing, a fine pressing and a cooling setting; preferably, the pre-pressing temperature includes 80-100℃, the pressure is 0.1-0.3 MPa, and the speed is 5-10 m / min; preferably, the fine pressing temperature includes 25-30℃, the pressure is 0.2-0.5 MPa, and the speed is 3-5 m / min; preferably, the cooling setting temperature is 15-20℃; preferably, in step (3), the power of the laser is 5-50 W or 1-10 mJ, the scanning rate is 100-1000 mm / s, and the spot diameter is 0.05-0.5 mm; preferably, in step (3), the etching color development method includes performing layered etching according to a target color, and preferably a wavelength of the laser used for the etching is selected according to an absorption peak of an etching layer.

10. Use of the coated yarn of any one of claims 1-4 or the color-controllable fabric of claim 8 in a smart textile, a clothing fabric, or a security marking.

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