A three-dimensional printed cloth and a preparation process thereof

Abstract

The application provides a three-dimensional printed fabric and a preparation process thereof, and relates to the technical field of printed fabrics. The three-dimensional printed fabric comprises a base fabric, an intermediate layer and a netting layer from bottom to top. A first printed coating layer is arranged on the netting line of the netting layer away from the intermediate layer. A second printed coating layer is arranged in the mesh hole of the netting layer, the second printed coating layer penetrates the mesh hole, and the second printed coating layer is integrally arranged with the intermediate layer.

Description

Technical Field

[0001] This invention belongs to the field of printed fabric technology, and relates to a three-dimensional printed fabric and its preparation process. Background Technology

[0002] Printing on fabrics serves both decorative and functional purposes. For example, it can protect the fabric from damage caused by prolonged friction. Different print structures produce different effects. From both decorative and functional perspectives, more printing techniques are needed to achieve different print structures. One such technique involves printing different patterns on both the lines and openings of a mesh fabric, but this technique still requires further refinement. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a three-dimensional printed fabric and its preparation process.

[0004] The technical solution of the present invention is as follows:

[0005] A three-dimensional printed fabric, comprising, from bottom to top, a base fabric, a middle layer, and a mesh layer; A first printed coating is provided on the mesh line of the mesh layer opposite to the intermediate layer; A second printed coating is provided inside the mesh of the mesh layer, the second printed coating penetrates the mesh, and the second printed coating is integrally formed with the intermediate layer.

[0006] Preferably, the materials of the intermediate layer, the first printed coating, and the second printed coating are each selected from polyurethane; Alternatively, the material of the first printed coating is selected from polyurethane, and the materials of the intermediate layer and the second printed coating are each selected from aspartic polyurea; Alternatively, the material of the first printed coating is selected from aspartic polyurea, and the materials of the intermediate layer and the second printed coating are each selected from polyurethane.

[0007] Preferably, the height of the first printed coating and the height of the second printed coating are the same or different; The first printed coating may be the same color as or different from the second printed coating.

[0008] Preferably, the height of the second printed coating is higher than the height of the mesh opening; The intermediate layer may be continuous or discontinuous.

[0009] A process for preparing the three-dimensional printed fabric according to any of the above embodiments includes the following steps: The first printing paste is applied to the mesh lines of the mesh and dried to obtain a pre-coated mesh. A perforated screen is placed on the base fabric. The perforated areas of the perforated screen are filled with a second printing paste. After smoothing, the screen is lifted to obtain a pre-printed coating. The pre-coated mesh is placed on top of the pre-printed coating. The perforated screen is used to squeeze the pre-coated mesh so that the pre-printed coating passes through the mesh openings of the pre-coated mesh and protrudes. The perforated screen is removed, and the fabric is dried to obtain the three-dimensional printed fabric.

[0010] Preferably, the first printing paste and the second printing paste are each selected from water-based polyurethane pastes; Alternatively, the first printing paste is selected from water-based polyurethane paste, and the second printing paste is selected from aspartic polyurea paste; Alternatively, the first printing paste is selected from aspartic polyurea paste, and the second printing paste is selected from water-based polyurethane paste.

[0011] Preferably, the thixotropic index of the second printing paste is not less than 4; The size of the mesh opening is not less than 1 mm.

[0012] Preferably, the application of the first printing paste to the mesh lines of the mesh is performed using a screen printing process with a screen mesh count of 100-300.

[0013] More preferably, after screen printing, the process further includes: scraping the surface of the screen on a flat cloth to remove excess material from the back of the screen printing stencil.

[0014] Preferably, the perforations of the perforated screen match the mesh openings of the pre-coated mesh. The thickness of the perforated screen is 0.1-3mm.

[0015] The beneficial effects of this invention are: (1) In the three-dimensional printed fabric of the present invention, different prints are formed on the mesh line and inside the mesh, and there is an intermediate layer between the print inside the mesh and the base fabric. The intermediate layer plays a role in bonding and stabilizing, thus obtaining a composite printed fabric with obvious three-dimensional structure.

[0016] (2) Printing on the mesh fabric and the mesh line can provide good protection for the mesh layer, such as improving abrasion resistance. In particular, when at least one of the prints on the mesh fabric and the prints in the mesh line is aspartic polyurea, the abrasion resistance of the printed coating can be significantly improved.

[0017] (3) In the three-dimensional printed fabric preparation process of the present invention, a first printing coating is first formed on the screen, which forms a spatial steric constraint and avoids overflowing onto the screen when the second printing coating is formed. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the structure of the three-dimensional printed fabric in Example 1.

[0019] Figure 2 This is a photograph of the three-dimensional printed fabric of Example 1. Detailed Implementation

[0020] The technical solution of the present invention will be further explained and described below through specific embodiments.

[0021] On the one hand, the present invention proposes a three-dimensional printed fabric, which includes a base fabric, an intermediate layer and a mesh layer from bottom to top; A first printing coating is provided on the mesh line of the mesh layer opposite to the middle layer; A second printing coating is provided inside the mesh of the mesh layer. The second printing coating penetrates through the mesh and is integrated with the intermediate layer.

[0022] The three-dimensional printed fabric of the present invention is a composite fabric, including a base fabric and a mesh layer. The mesh layer and the base fabric are connected by an intermediate layer. A first printing coating is provided on the mesh line of the mesh layer, and a second printing coating is provided in the mesh opening, forming a composite print. Moreover, the second printing coating and the intermediate layer are integrated, that is, the intermediate layer and the second printing coating are integrated and firmly bond the mesh layer to the base fabric.

[0023] In some embodiments, the materials of the intermediate layer, the first printed coating, and the second printed coating are individually selected from polyurethane; Alternatively, the material of the first printed coating is selected from polyurethane, and the materials of the intermediate layer and the second printed coating are each selected from aspartic polyurea. Alternatively, the material of the first printed coating is selected from aspartic polyurea, and the materials of the intermediate layer and the second printed coating are each selected from polyurethane.

[0024] Polyurethane is a commonly used material for printing coatings, characterized by good flexibility, but its abrasion resistance is slightly insufficient. Aspartic polyurea has better abrasion resistance, but is relatively rigid. When the intermediate layer, the first printing coating, and the second printing coating are all made of polyurethane, the 3D printed fabric has good flexibility. When at least one of the intermediate layer, the first printing coating, and the second printing coating is made of aspartic polyurea, the abrasion resistance of the 3D printed fabric can be significantly improved.

[0025] In some embodiments, the heights of the first printed coating and the second printed coating may be the same or different; The first printing coating may have the same color as or be different from the second printing coating.

[0026] The first and second printing coatings can have the same or different heights and colors, resulting in three-dimensional printed fabrics with different three-dimensional effects. The surfaces of the first and second printing coatings can be flat, rough, or rounded, respectively. The first and second printing coatings can also be foamable coatings that are then foamed under heat.

[0027] In some embodiments, the height of the second printed coating is higher than the height of the mesh opening; The intermediate layer can be continuous or discontinuous.

[0028] The second printed coating is higher than the mesh openings, making it protrude and creating a more pronounced three-dimensional effect. The intermediate layer can be continuous or discontinuous; a discontinuous layer makes the three-dimensional printed fabric easier to bend.

[0029] On the other hand, the present invention also proposes a preparation process for the three-dimensional printed fabric described in any of the above embodiments, the steps of which include: The first printing paste is applied to the mesh lines of the mesh and dried to obtain a pre-coated mesh. A stencil is placed on the base fabric. The stencil is filled with the second printing paste, which is then smoothed out and the stencil is lifted to obtain a pre-printed coating. A pre-coated mesh is placed on top of the pre-printed coating, and the stencil is used to press the pre-coated mesh so that the pre-printed coating passes through the mesh openings and protrudes. The stencil is then removed, and the fabric is dried to obtain a three-dimensional printed fabric.

[0030] This invention first forms a first printing coating on the mesh of a mesh fabric to obtain a pre-coated mesh. Then, a second printing paste is applied to the base fabric using a perforated screen to form a pre-printed coating. A "core-injection" process is employed, where the pre-printed coating (second printing paste) is forced through the mesh openings of the pre-coated mesh (with the coating facing upwards) by extrusion, forming the second printing coating. A portion of the second printing paste remains unextruded into the mesh and remains on the base fabric, forming an intermediate layer. The intermediate layer and the second printing coating are integrated. Therefore, the preparation process of the three-dimensional printed fabric of this invention is relatively simple. When the base fabric has poor flatness or adhesion, it can be pre-treated, for example, by using an adhesion promoter or a base paste layer, to improve the adhesion of the base fabric.

[0031] In some embodiments, the first printing paste and the second printing paste are individually selected from water-based polyurethane pastes; Alternatively, the first printing paste is selected from water-based polyurethane paste, and the second printing paste is selected from aspartic polyurea paste; Alternatively, the first printing paste is selected from aspartic polyurea paste, and the second printing paste is selected from water-based polyurethane paste.

[0032] When both the first and second printing pastes are selected from water-based polyurethane pastes, the three-dimensional printed fabric has better flexibility; when one of the first and second printing pastes is selected from aspartic polyurea paste, the obtained three-dimensional printed fabric has better abrasion resistance.

[0033] In some embodiments, the thixotropic index of the second printing paste is not less than 4; The mesh size should be no less than 1 mm. A high thixotropic index in the second printing paste allows for a higher height of the second printing coating. In this invention, the thixotropic index is tested as follows: using a rotary viscometer, the ratio of the viscosity value measured at 7.5 r / min at 25°C to the viscosity value measured at 75 r / min is used. A higher thixotropic index results in a higher height of the second printing coating. For example, the thixotropic index can be 4, 5, or 6. If the mesh size is too low (e.g., 0.5 mm), the first printing paste may cover and clog the mesh during screen printing.

[0034] By adjusting the amount, area, and degree of compression of the second printing paste, the resulting intermediate layer can be made continuous or discontinuous.

[0035] In this invention, there are no particular restrictions on the source of the first and second printing pastes; they can be obtained directly from the market or prepared according to existing technology.

[0036] In some embodiments, the application of the first printing paste to the mesh lines of the mesh is performed using a screen printing process with a screen mesh count of 100-300. The first printing paste is applied directly using a screen printing process, which can form a first printing coating on the mesh lines of the mesh.

[0037] In some embodiments, after screen printing, the process further includes: smoothing on a flat cloth to remove excess material from the back of the screen printing stencil. That is, after each screen printing of the first printing paste, smoothing is performed on a flat cloth (blank cloth) before another screen printing of the first printing paste. This removes excess material from the back of the stencil, preventing it from covering the mesh openings of the yarn after a single screen printing pass. This technique is suitable for applications requiring multiple screen printing passes to increase the thickness of the first printing coating.

[0038] In some embodiments, the perforations of the stencil match the mesh openings of the pre-coated mesh; the perforations of the stencil are directly opposite the mesh openings of the pre-coated mesh, and the perforations become reserved spaces during extrusion, allowing the second printing paste to be more fully extruded into the mesh openings.

[0039] The thickness of the stencil is 0.1-3mm. There is no particular limitation on the thickness of the stencil; it can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.5mm, 1.7mm, 12mm, 2.2mm, 2.5mm, 2.8mm, 3mm, etc.

[0040] The technical solution of the present invention will be further described and illustrated below with reference to various embodiments. Unless otherwise specified, the parts mentioned in the following embodiments are parts by weight.

[0041] In the following embodiments, the waterborne polyurethanes were obtained directly from the market. Waterborne polyurethane 1 is yellowish-brown, with a viscosity of 112,000 cps at 25°C and a thixotropic index of 3.5; waterborne polyurethane 2 is light green, with a viscosity of 103,000 cps at 25°C and a thixotropic index of 4.

[0042] Aspartic polyurea slurry is composed of component A and component B; The composition of component A is: 70 parts NH1520, 15 parts NH1420, 0.8 parts dispersant BYK163, 0.5 parts defoamer BYK-066N, 1.7 parts Japanese Kusumoto Chemicals Disparlon 6500 anti-settling agent and 12 parts Evonik R816; Under dispersion conditions of 1000 r / min, the raw material components of component A are added and stirred evenly to obtain component A.

[0043] Component B consists of 90 parts Covestro N3600 and 10 parts Evonik R816; Under dispersion conditions of 1000 r / min, the raw material components of component B were added and stirred evenly to obtain component B.

[0044] The aspartic polyurea slurry was obtained by mixing component A and component B at a ratio of 100:70 (by weight). The viscosity (rotational viscometer, 7.5 r, 25℃) was 96000 cps and the thixotropic index was 5.

[0045] Example 1 The structure of the three-dimensional printed fabric in this embodiment 1 is shown in the attached figure. Figure 1 The diagram shows that, from bottom to top, it includes a base fabric 1, a middle layer 2, and a mesh layer.

[0046] A first printing coating 4 is provided on the mesh layer opposite to the mesh line 3 of the middle layer. The first printing coating 4 is polyurethane and has a thickness of 0.3 mm.

[0047] A second printing coating 6 is disposed within the mesh openings 5 ​​(2mm in size) of the mesh layer, penetrating the mesh openings 5, and is integral with the intermediate layer 2. The second printing coating 6 is made of polyurethane and extends 0.5mm above the mesh lines.

[0048] The preparation method of 3D printed fabric is as follows: Water-based polyurethane paste 1 is screen-printed on the mesh using a 150-mesh screen. The water-based polyurethane paste 1 covers the screen line 3 (multiple printing passes, after which the mesh is smoothed on a flat cloth to remove the material buildup on the back of the screen printing screen). The mesh is then baked at 60°C for 10 minutes to obtain a pre-coated mesh. The coating on the pre-coated mesh is the first printing coating 4. A stencil (1mm high) is placed on the base fabric 1. Water-based polyurethane paste 2 is filled into the stencil's cutouts, smoothed, and then the stencil is lifted to obtain a pre-printed coating. A pre-coated mesh (with the coating facing upwards) is placed on top of the pre-printed coating, and the stencil is used to press the pre-coated mesh (the cutouts of the stencil match the mesh openings of the pre-coated mesh). The pre-printed coating is pressed into the mesh openings 5 ​​of the pre-coated mesh and passes through the mesh openings 5, protruding above the mesh lines (this part of the pre-printed coating becomes the second printing coating 6 after drying, and the part of the pre-printed coating that is not pressed into the mesh openings becomes the intermediate layer 2 after drying; the intermediate layer 2 is continuous). The stencil is removed, and the fabric is dried at 60℃ for 20 minutes to obtain a three-dimensional printed fabric.

[0049] The actual sample of the 3D printed fabric obtained in this embodiment is attached. Figure 2 As shown, it has a distinct three-dimensional structure, and the first and second printed coatings can have different colors and different heights.

[0050] Example 2 The difference between this embodiment and Embodiment 1 is as follows: In Embodiment 1, the water-based polyurethane slurry 2 was replaced with aspartic polyurea slurry in the perforated areas of the stencil, and the drying time was changed from 60°C for 20 minutes to 80°C for 30 minutes. The remaining steps remain unchanged.

[0051] Example 3 The three-dimensional printed fabric consists of a base fabric, a middle layer, and a mesh layer from bottom to top.

[0052] A first printing coating is applied to the mesh layer opposite to the middle layer. The first printing coating is aspartic polyurea with a thickness of 0.3 mm.

[0053] A second printing coating is disposed within the mesh openings of the mesh layer, penetrating the mesh openings and integral with the intermediate layer. The second printing coating is made of polyurethane and extends 0.2mm above the mesh lines.

[0054] The preparation method of 3D printed fabric is as follows: Aspartic polyurea paste is applied to the mesh fibers (1 mm in size) of the mesh and baked at 80°C for 30 minutes to obtain a pre-coated mesh. The coating on the pre-coated mesh is the first printing coating. A stencil (0.7mm high) is placed on the base fabric. Water-based polyurethane paste 2 is filled into the stencil's cutouts, smoothed, and then the stencil is lifted to obtain a pre-printed coating. A pre-coated mesh (with the coating facing upwards) is placed on top of the pre-printed coating, and the stencil is used to press the pre-coated mesh (the cutouts of the stencil match the mesh openings of the pre-coated mesh). The pre-printed coating is pressed into the mesh openings of the pre-coated mesh and passes through the mesh openings, protruding above the mesh lines (this part of the pre-printed coating becomes the second printing coating after drying, and the part of the pre-printed coating that is not pressed into the mesh openings becomes the intermediate layer after drying; the intermediate layer is discontinuous). The stencil is removed, and the fabric is dried at 60℃ for 20 minutes to obtain a three-dimensional printed fabric.

[0055] Example 4 The difference between this embodiment and Embodiment 3 is that in Embodiment 3, the second printing coating is adjusted from protruding 0.2mm above the screen line to protruding 0.4mm above the screen line, meaning the second printing coating protrudes 0.1mm more than the first printing coating. The remaining steps remain unchanged.

[0056] The abrasion resistance and flexural strength of the 3D printed fabrics in Examples 1-4 are compared in Table 1 below. Before testing, the samples were baked in a 60℃ oven for 24 hours to promote complete curing.

[0057] Abrasion resistance: Tested according to ASTM D3886-22.

[0058] Flexural strength: Tested according to the method of GB / T 12586-2003.

[0059] Table 1

[0060] It can be seen that when one of the first and second printing coatings is aspartic polyurea, the abrasion resistance of the three-dimensional printed fabric can be significantly improved.

[0061] As described above, the basic principles, main features, and advantages of the present invention have been shown and described. Those skilled in the art should understand that the present invention is not limited to the above embodiments, which are merely preferred embodiments and should not be construed as limiting the scope of the invention. All equivalent changes and modifications made in accordance with the scope of the patent and the description should still fall within the scope of the present invention. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A three-dimensional printed fabric, characterized in that, From bottom to top, it includes a base fabric, a middle layer, and a mesh layer; A first printed coating is provided on the mesh line of the mesh layer opposite to the intermediate layer; A second printed coating is provided inside the mesh of the mesh layer, the second printed coating penetrates the mesh, and the second printed coating is integrally formed with the intermediate layer.

2. The three-dimensional printed fabric according to claim 1, characterized in that, The materials of the intermediate layer, the first printed coating, and the second printed coating are each individually selected from polyurethane; Alternatively, the material of the first printed coating is selected from polyurethane, and the materials of the intermediate layer and the second printed coating are each selected from aspartic polyurea; Alternatively, the material of the first printed coating is selected from aspartic polyurea, and the materials of the intermediate layer and the second printed coating are each selected from polyurethane.

3. The three-dimensional printed fabric according to claim 1, characterized in that, The height of the first printed coating may be the same as or different from that of the second printed coating. The first printed coating may be the same color as or different from the second printed coating.

4. The three-dimensional printed fabric according to claim 1, characterized in that, The height of the second printed coating is higher than the height of the mesh openings; The intermediate layer may be continuous or discontinuous.

5. A process for preparing the three-dimensional printed fabric according to any one of claims 1-4, characterized in that the step include: The first printing paste is applied to the mesh lines of the mesh and dried to obtain a pre-coated mesh. A perforated screen is placed on the base fabric. The perforated area of ​​the perforated screen is filled with a second printing paste. After smoothing, the screen is lifted to obtain a pre-printed coating. The pre-coated mesh is placed on top of the pre-printed coating. The pre-coated mesh is squeezed using the perforated screen to make the pre-printed coating protrude through the mesh openings of the pre-coated mesh. The perforated screen is then removed, and the fabric is dried to obtain the three-dimensional printed fabric.

6. The preparation process of the three-dimensional printed fabric according to claim 5, characterized in that, The first printing paste and the second printing paste are each selected from water-based polyurethane pastes; Alternatively, the first printing paste is selected from water-based polyurethane paste, and the second printing paste is selected from aspartic polyurea paste; Alternatively, the first printing paste is selected from aspartic polyurea paste, and the second printing paste is selected from water-based polyurethane paste.

7. The preparation process of the three-dimensional printed fabric according to claim 5, characterized in that, The thixotropic index of the second printing paste is not less than 4; The size of the mesh opening is not less than 1 mm.

8. The preparation process of the three-dimensional printed fabric according to claim 5, characterized in that, The application of the first printing paste to the mesh lines of the mesh is done using a screen printing process with a screen mesh count of 100-300.

9. The preparation process of the three-dimensional printed fabric according to claim 8, characterized in that, After the screen printing, the process further includes: smoothing the surface on a flat cloth to remove excess material from the back of the screen printing stencil.

10. The preparation process of the three-dimensional printed fabric according to claim 5, characterized in that, The perforations of the perforated screen match the mesh openings of the pre-coated mesh. The thickness of the perforated screen is 0.1-3mm.

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