Three-dimensional printed cloth and preparation method thereof

Abstract

The invention relates to a three-dimensional printed fabric and a preparation method thereof. The mold is covered with a layer of polymeric film, and pressure is applied to the film-covered mold for printing, so that the printing layer can accurately and deeply copy pattern details on the surface of the mold, printing paste is prevented from permeating into the mold, and the printing layer and the base cloth are combined more firmly. And as the film covering mold is easy to remove from the three-dimensional printing, the film covering mold can be repeatedly used, and the production cost is reduced. Besides, by optimizing the drying time and temperature of the printing layer, it is ensured that the coating is fully dried, the problem that the pattern positions are damaged in the mold removal process and the phenomena of burrs and ink layer pattern stripping are avoided, the attractiveness of the fabric is improved, the yield of the fabric is increased, and therefore the attractiveness and market competitiveness of the fabric are greatly improved. The base fabric is wide in material application range, including polyester, spandex and the like, can be a fabric with a flat surface or with jacquard, and meets different requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of three-dimensional printed fabrics, and more specifically relates to a three-dimensional printed fabric and a preparation method thereof. Background Art

[0002] As people's demand for beauty and personalization of clothing and home decoration continues to increase, three-dimensional printed fabrics have received more and more attention and popularity in the market. Three-dimensional printed fabrics can not only provide rich visual effects, but also enhance the added value of products through their unique touch. In order to meet the needs of the market, various three-dimensional printing technologies continue to emerge. However, the existing technology still has certain limitations and shortcomings. For example, the three-dimensional slurry forms a three-dimensional effect under the action of the mesh, but due to the obstruction of the mesh, the three-dimensional printing pattern is not clear enough, and the height of the printed protrusion is low, which affects the overall appearance; and the protrusion effect formed by the transfer technology remains on the foam material. When the mesh fabric is torn off, it is easy to cause burrs on the foam material and the ink layer pattern to peel off due to uneven force, affecting the appearance of the fabric and the yield rate. The above-mentioned deficiencies and defects restrict the market promotion of three-dimensional printed fabrics and need to be improved urgently. Summary of the invention

[0003] To this end, it is necessary to provide a three-dimensional printed fabric and a preparation method thereof to overcome the shortcomings of the above-mentioned three-dimensional printed fabric and the preparation method in the prior art, so as to significantly improve the clarity and protrusion height of the printed pattern, enhance the three-dimensional printed shape, enhance the aesthetics of the fabric, and at the same time simplify the process of producing three-dimensional printed fabrics, improve production efficiency, and reduce production costs.

[0004] To achieve the above object, in a first aspect, the present invention provides a method for preparing a three-dimensional printed fabric, comprising the following steps:

[0005] Preparing a film-coated mold: preparing an infiltration liquid, infiltrating a preset mold into the infiltration liquid, and drying the mold to obtain a film-coated mold with a polymer film on the surface;

[0006] Preparing a printing layer: preparing a printing paste, preparing a base fabric, and placing the printing paste on the base fabric to obtain a printing layer;

[0007] Printing: placing the laminating mold on the printing layer, and applying appropriate pressure to make the laminating mold contact with the printing layer;

[0008] Removing the mold: drying the printed layer, and removing the laminating mold from the dried printed layer to obtain a three-dimensional printed fabric;

[0009] Wherein, the infiltration solution includes the following components: 5-60g / L component A, 0-2ml / L pH regulator; the component A includes 20-30% acrylate polymer, 1-5% isopropyl alcohol or propylene glycol, and 65-75% water; preferably, the pH regulator is 60% acetic acid or citric acid, and more preferably, the amount of the component A is 30g / L, and the amount of the pH regulator is 1.2ml / L.

[0010] The impregnation liquid first penetrates into the preset mold, reacts at 140-160°C, and a layer of polymer film is coated on the surface of the preset mold. The polymer film is combined with the preset mold, and the contact angle between the polymer film and the surface of the preset mold is greater than 90°, so that the surface tension is less than 20mN / m, and the combination between the two is more solid. When the preset mold is placed on the printing layer, due to the barrier of the polymer film, the printing slurry contacts the preset mold, but will not penetrate into the preset mold. After the printing slurry is dried, the preset mold can be easily torn and removed, and the three-dimensional printing will not produce burrs and the ink layer pattern will not peel off. The polymer film on the surface of the preset mold can still remain intact and dense, and can be reused many times. Component A in the impregnation liquid is mainly composed of acrylate polymer, isopropyl alcohol or propylene glycol and water. These materials are all environmentally friendly materials, and the amount used is moderate, which reduces the emission of harmful substances. The repeated use of the coating mold reduces material waste. Therefore, the preparation method of the three-dimensional printed fabric of the present invention is in line with the current concept of green manufacturing and sustainable development.

[0011] The three-dimensional printed fabric created by the present invention improves the three-dimensional sense and fineness of the printing. By preparing a film-coated mold and applying pressure thereon for printing, the printing layer can accurately and deeply replicate the pattern details on the mold surface, thereby giving the fabric a strong three-dimensional sense and layering. The film-coated mold preparation process in the present invention is relatively simple and reusable, which improves production efficiency and flexibility and reduces production costs. At the same time, by adjusting the formula of the impregnation liquid and the design of the preset mold, the material, color and shape of the printed pattern can be flexibly controlled to meet the personalized needs of different consumers and improve the flexibility and diversity of production.

[0012] In some preferred embodiments, the temperature for drying the printed layer is 45-70° C. and the time is 7-10 hours. These embodiments control the drying time and temperature to achieve the best curing state of the resin, thickener, cross-linking agent and other components in the printed layer, reduce coating defects caused by insufficient or excessive drying, such as incomplete curing of the coating, sticky surface or brittle cracking caused by excessive hardening, thereby significantly improving the overall quality of the printed fabric.

[0013] In some preferred embodiments, the preset mold is a cloth with mesh, a cloth with raised patterns or other polymer materials with 3D structures. In these embodiments, a polymer material with mesh, raised patterns or 3D structures is used as a mold, and a three-dimensional pattern corresponding to the mold structure can be directly formed on the printing layer. Compared with other technologies, this direct physical embossing method can more accurately replicate the three-dimensional details of the mold, making the pattern of the printed fabric more layered and three-dimensional, greatly enriching the visual effect and tactile experience of the fabric. Different types of molds such as different mesh sizes, different convex shapes and depths, and different 3D structural designs provide unlimited possibilities for the design of printed patterns. According to market demand and consumer preferences, the mold type and pattern design can be flexibly selected to produce a variety of three-dimensional printed fabrics to meet the needs of different occasions and uses. Compared with some complex three-dimensional printing technologies in the prior art, using a mold with a three-dimensional structure for embossing is more direct and efficient. It saves the multi-step printing and post-processing process, reduces the production cost and process difficulty, and makes the production of three-dimensional printed fabrics easier. In addition, due to the precision and repeatability of the mold, using it for imprinting can ensure that the printed pattern on each piece of cloth remains highly consistent in size, shape and position, thereby improving the stability and consistency of product quality.

[0014] In some preferred embodiments, the printing paste comprises: 85-90wt% of mixed water-based PU resin, 1-3wt% of water-based dispersant, 1-3wt% of fine fibers, 0.5-2wt% of fumed silica, 0.5-2.0wt% of thickener, and 6-9wt% of water-based crosslinking agent. In the above embodiments, the mixed water-based PU resin is used as the main component, and its high dosage ratio ensures the strength, wear resistance and elasticity of the printing layer. At the same time, by adjusting the ratio of water-based PU with hydroxyl groups to water-based PU without hydroxyl groups, the film-forming performance and adhesion of the resin can be further optimized, thereby improving the clarity and durability of the printed pattern. The addition of water-based dispersants such as BYK190 can effectively disperse pigment particles, prevent pigment agglomeration, improve the stability and fluidity of the printing paste, and ensure uniform color and clear pattern during the printing process. The addition of fine fibers such as slender fibers after grinding polyester not only increases the thickness and three-dimensional sense of the printing layer, but also improves the touch of the cloth, making the printed cloth softer and more comfortable. As fine particles, fumed silica can form a microstructure in the printing layer, enhance the hardness and wear resistance of the coating, improve the scratch resistance, and protect the printed pattern from daily wear and tear. The appropriate addition of thickeners such as polyurethane or alkali-swellable thickeners can adjust the viscosity of the printing paste, making the printing process smoother, and also help improve the adhesion and peeling resistance of the printing layer. The addition of water-based crosslinking agents such as isocyanate crosslinking agents can promote the crosslinking reaction between resin molecules during the drying process, forming a more compact and stable coating structure, and improving the water resistance, solvent resistance and weather resistance of the printing layer.

[0015] In some preferred embodiments, the mixed water-based PU resin comprises a mixture of a water-based PU resin with hydroxyl groups and a water-based PU resin without hydroxyl groups, and the water-based PU with hydroxyl groups accounts for 20-40% of the content of the mixed water-based PU resin. In this way, the water-based PU resin with hydroxyl groups can form stronger chemical bonds with other components such as cross-linking agents and fibers due to the hydroxyl functional groups on its molecular chain, significantly improving the adhesion of the printing layer to the base fabric. At the same time, an appropriate amount of hydroxyl content also contributes to the interaction between resin molecules, promotes the uniformity and density of the film-forming process, and makes the printing layer smoother and smoother. The water-based PU resin without hydroxyl groups usually has good flexibility and elasticity. After mixing with the resin with hydroxyl groups, it can give the printing layer better flexibility and wrinkle resistance while maintaining a certain adhesion. This component ratio enables the printed fabric to maintain a good shape and feel during wearing or use. The mixed use of water-based PU resins with hydroxyl groups and those without hydroxyl groups can optimize the overall performance of the coating by adjusting the ratio of the two. The cross-linking effect of the hydroxyl resin enhances the cohesion of the coating, while the flexibility of the non-hydroxyl resin helps to alleviate the damage to the coating caused by external stress, thereby improving the overall stability and durability of the coating. Since the mixed resin has good film-forming properties and adhesion, the printing paste can be more evenly covered on the base fabric during the scraping process, and a clear and delicate pattern is formed after drying. At the same time, the stability and flexibility of the coating also help to maintain the integrity of the pattern during subsequent processing and use.

[0016] In some preferred embodiments, the thin fibers are slender fibers obtained after grinding polyester cloth, and the length of the thin fibers is 50-400um. In this way, waste polyester fabrics can be well recycled and reused. The slender fibers are interwoven and interspersed in the coating, and can form a tiny fiber network in the printing layer, which not only increases the thickness of the printing layer, but also makes the pattern more three-dimensional and layered visually. The addition of slender fibers enables the printed pattern to produce richer light and shadow effects under the irradiation of light, enhancing the overall beauty and attractiveness of the fabric. The slender fibers obtained after grinding polyester cloth are easier to be evenly dispersed in the printing paste due to their small size and regular shape, reducing the blockage phenomenon during the printing process and improving the printing efficiency and quality. The addition of slender fibers makes the printing paste more fluid and adaptable, and can better adapt to various molds with meshes, raised patterns or 3D structures, providing more possibilities for the design of printed patterns and broadening the application range of printed fabrics.

[0017] In some preferred embodiments, the base fabric is a fabric with a smooth surface or with jacquard pattern.

[0018] The printing paste can be arranged on the base fabric by scraping with a hollow pattern screen. In some preferred embodiments, the preparation of the printing layer also includes placing a first screen with a first hollow pattern on the base fabric, filling the printing paste into the first hollow pattern, removing the first screen, and obtaining the printing layer. Screen printing is an efficient automated or semi-automated production method. Compared with manual printing, screen printing can complete the printing task of large areas or complex patterns more quickly, and can greatly improve the production efficiency of the printing layer while maintaining the consistency and quality stability of the pattern. The use of a screen with a hollow pattern can ensure that the printing paste is accurately filled into the preset pattern area, avoiding the problems of blurred patterns and unclear edges that may occur in traditional manual printing. Screen printing technology can be flexibly applied to base fabrics of various materials and shapes, including fabrics with flat surfaces or jacquards. At the same time, by replacing different screens and printing paste formulas, printing effects of different colors, patterns and textures can be easily achieved to meet the design requirements of different products.

[0019] In some preferred embodiments, the "applying appropriate pressure" is to place a pressing block on the laminating mold for extrusion, and the pressing block is a second screen with a second hollow pattern, and the second hollow pattern is a proportional enlargement of the first hollow pattern, and the area of ​​the second hollow pattern is larger than the first hollow pattern. By using a second hollow pattern screen with a larger area than the first hollow pattern as a pressing block for extrusion, the printing paste can form a more obvious convex effect on the base fabric, thereby enhancing the three-dimensional sense and layering of the printing pattern. During the extrusion process, since the hollow pattern of the second screen is larger than that of the first screen and is proportionally enlarged, it can better control the diffusion range of the printing paste on the base fabric to avoid edge blur or overflow. Therefore, such a solution helps to optimize the clarity of the pattern edge and make the printing pattern more accurate and beautiful.

[0020] In the second aspect, the inventor provides a three-dimensional printed fabric prepared by the preparation method described in the first aspect of the present invention. The three-dimensional printed fabric prepared by the present invention has unique visual effects and good physical properties, and can therefore be widely used in a variety of fields such as clothing, home decoration, automobile interiors, and luggage accessories, providing more possibilities for product design and improving the added value and market competitiveness of the product.

[0021] Different from the prior art, the above technical solution applies pressure on the film-coated mold to print by covering a layer of polymer film on the mold, so that the printing layer can accurately and deeply replicate the pattern details on the mold surface, avoiding the printing slurry from penetrating into the mold, and making the printing layer and the base cloth more firmly combined. Since the film-coated mold is easy to remove from the three-dimensional printing, it can be reused many times, reducing the production cost. In addition, by optimizing the drying time and temperature of the printing layer, it is ensured that the coating is fully dried, the problem of damaging the flower position during the mold removal process and the phenomenon of burrs and ink layer pattern peeling are avoided, and the beauty and yield rate of the fabric are improved, thereby greatly improving the beauty and market competitiveness of the fabric. The base cloth material of the present invention has a wide range of applications, including polyester, spandex, etc., and can be a fabric with a flat surface or jacquard, meeting different needs. The three-dimensional printed fabric preparation method of the present invention shows significant beneficial effects and progress in improving printing effect, enhancing printing fastness, improving production efficiency, promoting environmental protection, and broadening the application field. These technological improvements and innovations not only solve various problems in the existing technologies, but also achieve higher production efficiency and product quality in the preparation process of three-dimensional printed fabrics, and have broad market prospects and commercial potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Comparative photos of the three-dimensional printed fabric in the prior art (left) and the three-dimensional printed fabric provided by Example 1 of the present invention (right);

[0023] Figure 2 This is a printing effect diagram of the second embodiment of the present invention;

[0024] Figure 3 This is a printing effect diagram of the third embodiment of the present invention;

[0025] Figure 4 The three-dimensional printing effect diagram (a) of the comparative example 1 and the three-dimensional printing effect diagram (b) provided by the fourth embodiment of the present invention;

[0026] Figure 5 It is a schematic diagram of forming a printing layer by scraping printing paste with a screen having a first hollow pattern on a flat polyester base fabric according to the first embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of placing a laminating mold on a printing layer and applying pressure to a pressing block using a second screen with a second hollow pattern in Example 1 of the present invention. DETAILED DESCRIPTION

[0028] In order to explain the technical content, structural features, achieved objectives and effects of the technical solution in detail, the following is a detailed description in conjunction with specific embodiments and accompanying drawings.

[0029] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0030] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0031] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.

[0032] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0033] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0034] Similar to the understanding in the Patent Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.

[0035] In the description of the embodiments of the present application, space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0036] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms such as "install", "connect", "connect", "fix", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0037] Among the existing technologies for preparing three-dimensional printed fabrics, most use three-dimensional slurry to form a three-dimensional effect under the action of mesh. However, due to the obstruction of the mesh, the three-dimensional printed pattern is not clear enough, and the height of the printed protrusion is low, which affects the overall appearance. In addition, the protrusion effect formed by the transfer technology remains on the foam material. When the mesh fabric is torn off, it is easy to cause burrs on the foam material and the ink layer pattern to peel off due to uneven force, affecting the appearance of the fabric and the yield rate. The present invention aims to overcome the shortcomings of the traditional printing method of flat patterns and lack of three-dimensional sense, so that the printed fabric is more vivid and lifelike in visual effect, and ensure that the pattern of the three-dimensional printed fabric is not easy to fall off or fade during long-term use, so as to maintain good decorative effect and durability.

[0038] Embodiment 1

[0039] A three-dimensional printed fabric and preparation method thereof

[0040] (I) Preparation of laminating mold

[0041] Preparation of the impregnation liquid: Take 30g / L of component A (component A contains 30% acrylate polymer, 5% isopropyl alcohol or propylene glycol, and the balance is water) and mix evenly with 1.2ml / L of pH adjuster (pH adjuster is 60% acetic acid). Select a polymer material mold with a preset mesh structure, immerse it in the above impregnation liquid, and then dry it at 150°C to evenly cover the mold surface with a layer of polymer film to obtain a film-coated mold.

[0042] (II) Preparation and printing of printing paste

[0043] A printing paste is prepared, which includes 85wt% of a mixed water-based PU resin, 3wt% of a water-based dispersant BYK190, 3wt% of fine fibers, which are polyester powder with a fiber size of 50-400um, 2.0wt% of fumed silica, 1.0wt% of a polyurethane thickener, and 6wt% of a Covestro 3900 crosslinker, and the above components are fully mixed. The mixed water-based PU resin is a mixture of a water-based PU resin with hydroxyl groups and a water-based PU resin without hydroxyl groups, wherein the water-based PU with hydroxyl groups accounts for 22% of the content of the mixed water-based PU resin.

[0044] On the flat polyester base fabric, use the screen with the first hollow pattern to scrape the printing paste to form a printing layer (see Figure 5 ).

[0045] (III) Lamination die printing

[0046] Place the laminating mold on the printed layer, and use the second screen with a second hollow pattern to apply pressure to the pressing block. The pressure can be applied automatically or manually to ensure that the laminating mold is in close contact with the printed layer. The second hollow pattern is obtained by enlarging the first hollow pattern in equal proportion (see Figure 6 ).

[0047] Dry at 50°C for 8 hours to ensure that the printed layer is fully cured without damaging the coating.

[0048] (IV) Remove the mold

[0049] After the printed layer is cured and dried, carefully remove the mold to obtain Figure 1 The surface shown has a printed fabric with a clear three-dimensional pattern.

[0050] The method for preparing three-dimensional printed fabrics provided in this embodiment produces a polymer film layer on the surface of the mold by infiltration treatment of the polymer mold, and is combined with the scraping printing (embossing) technology. The printing paste can be easily removed after drying without burrs or peeling of the ink layer pattern, and the three-dimensional printing shape is not damaged. The three-dimensional effect of the printed pattern is achieved, the visual and tactile experience of the textile is enriched, and it has significant technical progress and market promotion value.

[0051] Embodiment 2

[0052] A three-dimensional printed fabric and preparation method thereof

[0053] (I) Preparation of laminating mold

[0054] Preparation of the impregnation liquid: Take 5g / L of component A (component A contains 30% acrylate polymer, 5% isopropyl alcohol or propylene glycol, and the balance is water) and mix evenly with 1.2ml / L of pH adjuster (pH adjuster is 60% acetic acid). Select a polymer material mold with a preset jacquard structure, immerse it in the above impregnation liquid, and then dry it at 140°C to evenly cover the surface of the mold with a layer of polymer film to obtain a film-coated mold.

[0055] (II) Preparation and printing of printing paste

[0056] A printing paste is prepared, which includes 90wt% of a mixed water-based PU resin, 1wt% of a water-based dispersant BYK190, 1wt% of fine fibers, which are polyester powder with a fiber size of 50-400um, 1wt%, 1.1wt% of fumed silica, 0.8wt% of a polyurethane thickener, and 6.1wt% of a Covestro 3900 crosslinker, and the above components are fully mixed. The mixed water-based PU resin is a mixture of a water-based PU resin with hydroxyl groups and a water-based PU resin without hydroxyl groups, wherein the water-based PU with hydroxyl groups accounts for 20% of the content of the mixed water-based PU resin.

[0057] On the flat polyester base fabric, a printing paste is scraped and coated using a screen with a first hollow pattern to form a printing layer.

[0058] (III) Lamination die printing

[0059] The laminating mold is placed on the printed layer, and pressure is applied to the pressing block using a second screen with a second hollow pattern. The pressure can be applied automatically or manually to ensure that the laminating mold is in close contact with the printed layer. The second hollow pattern is obtained by enlarging the first hollow pattern in equal proportion.

[0060] Dry at 70°C for 5 hours to ensure that the printed layer is fully cured without damaging the coating.

[0061] (IV) Remove the mold

[0062] After the printed layer is cured and dried, carefully remove the mold to obtain Figure 2 The surface shown has a printed fabric with a clear three-dimensional pattern.

[0063] The method for preparing three-dimensional printed fabrics provided in this embodiment produces a polymer film layer on the surface of the mold by infiltration treatment of the polymer mold, and is combined with the scraping printing (embossing) technology. The printing paste can be easily removed after drying without burrs or peeling of the ink layer pattern, and the three-dimensional printing shape is not damaged. The three-dimensional effect of the printed pattern is achieved, the visual and tactile experience of the textile is enriched, and it has significant technical progress and market promotion value.

[0064] Embodiment 3

[0065] A three-dimensional printed fabric and preparation method thereof

[0066] (I) Preparation of laminating mold

[0067] Preparation of the impregnation liquid: Take 60g / L of component A (component A contains 30% acrylate polymer, 5% isopropyl alcohol or propylene glycol, and the balance is water) and mix evenly with 1.2ml / L of pH adjuster (pH adjuster is 60% acetic acid). Select a polymer material mold with a preset jacquard structure, immerse it in the above impregnation liquid, and then dry it at 160°C to evenly cover the surface of the mold with a layer of polymer film to obtain a film-coated mold.

[0068] (II) Preparation and printing of printing paste

[0069] A printing paste is prepared, which includes 85wt% of a mixed water-based PU resin, 2.0wt% of a water-based dispersant BYK190, 1.8wt% of fine fibers, which are ground polyester powder with a fiber size of 50-400um, 0.5wt% of fumed silica, 1.7wt% of a polyurethane thickener, and 9wt% of a Covestro 3900 crosslinker. The above components are fully mixed. The mixed water-based PU resin is a mixture of a water-based PU resin with hydroxyl groups and a water-based PU resin without hydroxyl groups, wherein the water-based PU with hydroxyl groups accounts for 40% of the content of the mixed water-based PU resin.

[0070] On the flat polyester base fabric, a printing paste is scraped and coated using a screen with a first hollow pattern to form a printing layer.

[0071] (III) Lamination die printing

[0072] The laminating mold is placed on the printed layer, and pressure is applied to the pressing block using a second screen with a second hollow pattern. The pressure can be applied automatically or manually to ensure that the laminating mold is in close contact with the printed layer. The second hollow pattern is obtained by enlarging the first hollow pattern in equal proportion.

[0073] Dry at 45°C for 12 hours to ensure that the printed layer is fully cured without damaging the coating.

[0074] (IV) Remove the mold

[0075] After the printed layer is cured and dried, carefully remove the mold to obtain Figure 3 The surface shown has a printed fabric with a clear three-dimensional pattern.

[0076] The method for preparing three-dimensional printed fabrics provided in this embodiment produces a polymer film layer on the surface of the mold by infiltration treatment of the polymer mold, and is combined with the scraping printing (embossing) technology. The printing paste can be easily removed after drying without burrs or peeling of the ink layer pattern, and the three-dimensional printing shape is not damaged. The three-dimensional effect of the printed pattern is achieved, the visual and tactile experience of the textile is enriched, and it has significant technical progress and market promotion value.

[0077] Embodiment 4

[0078] (I) Preparation of laminating mold

[0079] Preparation of the impregnation liquid: Take 30g / L of component A (component A contains 20% acrylate polymer, 1% isopropyl alcohol or propylene glycol, and the balance is water) and mix evenly with 2ml / L of pH adjuster (pH adjuster is 60% citric acid). Select a polymer material mold with a preset mesh structure, immerse it in the above impregnation liquid, and then dry it at 150°C to evenly cover the mold surface with a layer of polymer film to obtain a film-coated mold.

[0080] (II) Preparation and printing of printing paste

[0081] A printing paste is prepared, which includes 87wt% of a mixed water-based PU resin, 1.5wt% of a water-based dispersant BYK190, 2.3wt% of fine fibers, which are polyester powder with a fiber size of 50-400um, 1.2wt% of fumed silica, 0.6wt% of a polyurethane thickener, and 7.4wt% of a Covestro 3900 crosslinker. The above components are fully mixed. The mixed water-based PU resin is a mixture of a water-based PU resin with hydroxyl groups and a water-based PU resin without hydroxyl groups, wherein the water-based PU with hydroxyl groups accounts for 30% of the content of the mixed water-based PU resin.

[0082] On the flat polyester base fabric, a printing paste is scraped and coated using a screen with a first hollow pattern to form a printing layer.

[0083] (III) Lamination die printing

[0084] The laminating mold is placed on the printed layer, and pressure is applied to the pressing block using a second screen with a second hollow pattern. The pressure can be applied automatically or manually to ensure that the laminating mold is in close contact with the printed layer. The second hollow pattern is obtained by enlarging the first hollow pattern in equal proportion.

[0085] Dry at 50°C for 8 hours to ensure that the printed layer is fully cured without damaging the coating.

[0086] (IV) Remove the mold

[0087] After the printed layer is cured and dried, carefully remove the mold to obtain Figure 4 (b) The printed fabric shown in the figure has a clear three-dimensional pattern on the surface.

[0088] The method for preparing three-dimensional printed fabrics provided in this embodiment produces a polymer film layer on the surface of the mold by infiltration treatment of the polymer mold, and is combined with the scraping printing (embossing) technology. The printing paste can be easily removed after drying without burrs or peeling of the ink layer pattern, and the three-dimensional printing shape is not damaged. The three-dimensional effect of the printed pattern is achieved, the visual and tactile experience of the textile is enriched, and it has significant technical progress and market promotion value.

[0089] Comparative Example 1

[0090] A multi-layer three-dimensional fabric and its production method and application

[0091] See also Figure 4 (a), this comparative example provides a 4-layer three-dimensional fabric and its production method and application. The production method is as follows:

[0092] (1) Preparation of three-dimensional slurry layer slurry: In terms of mass percentage, 85% of aqueous polyurethane dispersion (Wanhua 5630), 0.2% of pH adjuster (2-amino-2-methyl-1-propanol), 0.19% of silicone defoamer (BYK 192, polyether siloxane copolymer), 0.6% of dispersant (BYK 190, alkoxy ammonium salt of polycarboxylic acid polymer), 2.0% of cotton fiber (60 mesh), 1.3% of PU thickener (Rohm and Haas ASE60, non-ionic ethoxylated polyurethane polymer with a molecular weight of 30,000-50,000), 9.0% of cellulose ether (10% of Asia Blue HEC 250, molecular weight 10K), 0.51% of acrylic thickener (Lubrizol SF-1, methacrylic acid copolymer), and 1.2% of propylene glycol were mixed evenly, and 4% of the above-mentioned total mass of isocyanate curing agent was added to obtain a three-dimensional slurry layer slurry. The viscosity of the slurry is 100000±10000 mPa·s at 7.5 rpm, 25000±2000 mPa·s at 75 rpm, and the surface drying time is 1 hour.

[0093] (2) Lay the base fabric layer (single-layer warp knitted mesh) flat on a flat platform. Place a first screen having a first preset hollow pattern and a hollow pattern thickness of 0.5 mm on the base fabric layer, fill the three-dimensional slurry layer slurry into the first preset hollow pattern by scraping, remove the first screen, and form a three-dimensional slurry layer. The length of the first preset hollow pattern is 5-200 mm (the longest distance is 200 mm, and the shortest distance is 5 mm), and the width is 3-20 mm (the longest distance is 20 mm, and the shortest distance is 3 mm).

[0094] (3) When the three-dimensional slurry layer is not dry, a single layer of mesh with a mesh size of 1 mm, a skeleton width of 0.5 mm, a warp breaking strength of the mesh layer of ≥150 N, and a weft breaking strength of ≥200 N is cut and placed on the three-dimensional slurry layer (the interval between the previous operation and the previous operation shall not exceed 5 minutes). Then, a second screen having a second preset hollow pattern (the same as the first preset hollow pattern, but the edge of the second preset hollow pattern is 1 mm larger than the edge of the first preset hollow pattern) and a hollow pattern thickness of 5 mm is pressed on the mesh layer with a pressure of 20 N, so that the three-dimensional slurry layer forms an extruded layer protruding from the mesh layer, and a sandwich layer between the base fabric layer and the mesh layer.

[0095] (4) Allow to set naturally at room temperature, then heat cure at 30°C to obtain Figure 4 (a) shows the 4-layer three-dimensional fabric.

[0096] from Figure 4 As can be seen from the figure (a), due to the obstruction of the mesh, the pattern of the three-dimensional printing is not clear and the height of the printed protrusion is low, which affects the overall appearance.

[0097] In summary, compared with the comparative example, the present invention can not only be combined with materials with meshes to achieve a more obvious three-dimensional printing effect on the coating surface, a clearer pattern, and a better raised effect; it also broadens the scope of application, and when combined with materials with jacquard structures, a clear and obvious texture pattern effect is formed on the surface.

[0098] It should be noted that, although the above embodiments have been described in this article, the patent protection scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, changes and modifications made to the embodiments described herein, or equivalent structures or equivalent process changes made using the contents of the present invention specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields, are all included in the patent protection scope of the present invention.

Claims

1. A method for preparing a three-dimensional printed fabric, It is characterized in that The following steps are involved: Preparing a film-coated mold: preparing an infiltration liquid, infiltrating a preset mold into the infiltration liquid, and drying the mold to obtain a film-coated mold with a polymer film on the surface; Preparing a printing layer: preparing a printing paste, preparing a base fabric, and placing the printing paste on the base fabric to obtain a printing layer; Printing: placing the laminating mold on the printing layer, and applying appropriate pressure to make the laminating mold contact with the printing layer; Removing the mold: drying the printed layer, and removing the laminating mold from the dried printed layer to obtain a three-dimensional printed fabric; The infiltration solution comprises the following components: 5-60 g / L component A, 0-2 ml / L pH regulator; the component A comprises 20-30% acrylate polymer, 1-5% isopropyl alcohol or propylene glycol, and 65-75% water.

2. The method for preparing the three-dimensional printed fabric according to claim 1, It is characterized in that The printing layer is dried at a temperature of 45-70° C. for 5-12 hours.

3. The method for preparing the three-dimensional printed fabric according to claim 1, It is characterized in that The preset mold is a cloth with mesh holes, a cloth with raised patterns or other polymer materials with a 3D structure.

4. The method for preparing the three-dimensional printed fabric according to claim 1, It is characterized in that The printing paste comprises: Mix 85-90wt% of water-based PU resin, 1-3wt% of water-based dispersant, 1-3wt% of fine fibers, 0.5-2wt% of fumed silica, 0.5-2.0wt% of thickener, and 6-9wt% of water-based crosslinking agent.

5. The method for preparing the three-dimensional printed fabric according to claim 4, It is characterized in that The mixed water-based PU resin comprises a mixture of a water-based PU resin with hydroxyl groups and a water-based PU resin without hydroxyl groups, and the water-based PU with hydroxyl groups accounts for 20-40% of the mixed water-based PU resin.

6. The method for preparing the three-dimensional printed fabric according to claim 4, It is characterized in that The fine fibers are slender fibers obtained by grinding polyester cloth, and the length of the fine fibers is 50-400um.

7. The method for preparing the three-dimensional printed fabric according to claim 1, It is characterized in that The base fabric is a fabric with a flat surface or with jacquard patterns.

8. The method for preparing the three-dimensional printed fabric according to claim 1, It is characterized in that The method of preparing the printing layer also includes placing a first screen having a first hollow pattern on the base fabric, filling the printing paste into the first hollow pattern, and removing the first screen to obtain the printing layer.

9. The method for preparing the three-dimensional printed fabric according to claim 8, It is characterized in that The "applying appropriate pressure" is to place a pressing block on the laminating mold for extrusion, the pressing block is a second screen having a second hollow pattern, the second hollow pattern is a proportional enlargement of the first hollow pattern, and the area of ​​the second hollow pattern is larger than that of the first hollow pattern.

10. A three-dimensional printed fabric prepared according to the preparation method according to any one of claims 1 to 9.

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