Printing coating cloth and preparation method thereof

Abstract

The invention provides printed coating cloth and a preparation method thereof, and relates to the technical field of printed coatings. According to the invention, the discontinuous polyurea coating is arranged at the hollow pattern position of the continuous polyurethane coating, or the discontinuous polyurea coating is arranged on the surface of the continuous polyurethane coating, so that the influence on the flexibility of the printed coating is relatively low, and the printed coating cloth with both wear resistance and flexibility can be obtained.

Description

Technical Field

[0001] This invention belongs to the field of printing coating technology, and relates to a printed coating fabric and its preparation method. Background Technology

[0002] The printed coating on the fabric surface serves both decorative and functional purposes. Since the printed coating is exposed to the outside, it is frequently subjected to friction; if its abrasion resistance is poor, it is easily worn away. Therefore, improving the abrasion resistance of the printed coating is essential. Existing technologies generally modify the printing paste used in the printing coating. For example, Chinese patent CN113832748A discloses an elastic printing paste containing a single-component resin, with raw material components including silicone-modified polyurethane; Chinese patent CN119102128A discloses an abrasion-resistant printing paste, with raw material components including water-based silicone resin, water-based silica sol, and modified microspheres. However, the printing pastes obtained by the above methods are costly and unsuitable for large-scale promotion and use, and may also lead to a decrease in the softness and flexural strength of the printed coating.

[0003] Therefore, existing abrasion-resistant printed coatings need further optimization. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a printed coated fabric and its preparation method.

[0005] The technical solution of the present invention is as follows:

[0006] A printed coated fabric comprising a fabric and a printed coating; The printed coating is located on the surface of the fabric; The printed coating comprises a continuous polyurethane coating and a discontinuous polyurea coating; The continuous polyurethane coating has several hollowed-out patterns, and the discontinuous polyurea coating is dispersed among the several hollowed-out patterns. The thickness of the polyurea coating is not less than the thickness of the polyurethane coating. Alternatively, the discontinuous polyurea coating may be located on the surface of the continuous polyurethane coating away from the fabric.

[0007] Preferably, when the discontinuous polyurea coating is dispersed among the plurality of hollowed-out patterns, the thickness of the polyurea coating is greater than the thickness of the polyurethane coating; The various hollowed-out flower positions are not connected to each other.

[0008] More preferably, the thickness of the polyurea coating is 0.05 mm or more greater than the thickness of the polyurethane coating.

[0009] More preferably, the thickness of the polyurethane coating is 0.1-2 mm, and the thickness of the polyurea coating is 0.5-6 mm.

[0010] More preferably, the discontinuous polyurea coating fills all of the plurality of perforated patterns; Alternatively, there may be gaps between the discontinuous polyurea coating and the plurality of perforated patterns.

[0011] Preferably, when the discontinuous polyurea coating is located on the surface of the continuous polyurethane coating away from the fabric, the thickness of the polyurethane coating is 0.1-2 mm, and the thickness of the polyurea coating is 0.01-1 mm.

[0012] More preferably, the polyurea coating is selected from aspartic polyurea coating; The polyurea coating has a regular or irregular shape, and the length of the projection of the polyurea coating onto a plane perpendicular to the fabric does not exceed 2 cm.

[0013] More preferably, the discontinuous polyurea coating is divided into several regions, and the thickness of the polyurea coating in the several regions may be the same or different. Alternatively, the polyurea coatings in the aforementioned regions may have the same or different shapes.

[0014] A method for preparing the printed coated fabric according to any of the above embodiments includes printing polyurethane paste with a hollow pattern on the fabric using a screen printing plate, drying it to form the continuous polyurethane coating; printing a filling polyurea paste at the hollow pattern positions of the continuous polyurethane coating, drying it to form the discontinuous polyurea coating, and obtaining the printed coated fabric. Alternatively, a polyurethane paste is printed on the fabric and dried to form the continuous polyurethane coating; a polyurea paste is printed on the continuous polyurethane coating and dried to form the discontinuous polyurea coating, thereby obtaining the printed coated fabric.

[0015] Preferably, the polyurethane slurry is selected from water-based polyurethane slurries; The polyurea slurry is an aspartic polyurea slurry, and the viscosity of the aspartic polyurea slurry at 25°C is 50,000-150,000 cps.

[0016] The beneficial effects of this invention are: (1) The present invention uses a polyurethane coating with good flexibility and a polyurea coating with good wear resistance to form a printing coating. The polyurethane coating forms a continuous coating with hollowed-out patterns, and the polyurea coating is discontinuous and dispersed in the hollowed-out patterns, or the discontinuous polyurea coating is located above the polyurethane coating. The polyurea coating improves the wear resistance of the printing coating and avoids reducing the flexibility of the printing coating, so that the printing coating has both good flexibility and wear resistance.

[0017] (2) The method for preparing the printing coating of the present invention is simple, can use raw materials that are sold on a large scale in the market, has low cost, and can further optimize the appearance of the printing coating. Attached Figure Description

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

[0019] Figure 2 This is a photograph of the printed coated fabric from Example 1.

[0020] Figure 3 This is a schematic diagram of the structure of the printed coated fabric in Example 4. Detailed Implementation

[0021] The technical solution of the present invention will be further explained and described below through specific embodiments.

[0022] On the one hand, the present invention proposes a printed coated fabric, comprising a fabric and a printed coating; The printing coating is located on the surface of the fabric; The printed coating includes continuous polyurethane coatings and discontinuous polyurea coatings; The continuous polyurethane coating has several perforated patterns, while the discontinuous polyurea coating is dispersed among several perforated patterns. The thickness of the polyurea coating is not less than the thickness of the polyurethane coating. Alternatively, a discontinuous polyurea coating may be located on the surface of a continuous polyurethane coating away from the fabric.

[0023] The printed coating of this invention consists of a continuous polyurethane coating and a discontinuous polyurea coating. The continuous polyurethane coating provides flexibility, while the discontinuous polyurea coating provides abrasion resistance. Although the polyurea coating has higher hardness and lower flexibility, its discontinuity means it does not significantly affect the flexibility of the polyurethane coating. Therefore, the printed coating of this invention can combine good flexibility and abrasion resistance, and exhibits good flexural properties.

[0024] In this invention, there are two ways to set the discontinuous polyurea coating. One is to disperse it in the hollowed-out pattern of the polyurethane coating. Both the polyurethane coating and the polyurea coating are attached to the surface of the fabric. The polyurea coating is separated by the hollowed-out pattern and forms a discontinuous state, such as a scattered distribution. The other is that the polyurea coating is directly formed on the surface of the polyurethane coating and is discontinuous, that is, the polyurea coating does not directly contact the fabric. For example, a three-point polyurea coating is distributed on the surface of the polyurethane coating.

[0025] In some embodiments, when the discontinuous polyurea coating is dispersed in several perforated areas, the thickness of the polyurea coating is greater than the thickness of the polyurethane coating. The openwork flower positions are not connected.

[0026] The perforated patterns are not connected, forming an isolated state. The polyurea coating is distributed within these perforated patterns, and therefore, the polyurea coating is also not connected, forming a discontinuous state. When the thickness of the polyurea coating is greater than that of the polyurethane coating, it is equivalent to the polyurea coating protruding from the printing coating dimension. When the printing coating is subjected to external friction, it first comes into contact with the wear-resistant polyurea coating, thereby improving the wear resistance of the printing coating, especially protecting the polyurethane coating.

[0027] In some embodiments, the thickness of the polyurea coating is 0.05 mm or more greater than the thickness of the polyurethane coating. This invention has found that as long as the thickness of the polyurea coating is 0.05 mm or more greater than the thickness of the polyurethane coating, the abrasion resistance of the printed coating can be significantly improved. For example, the thickness of the polyurea coating being 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc., can be greater than the thickness of the polyurethane coating.

[0028] In some embodiments, the thickness of the polyurethane coating is 0.1-2 mm, and the thickness of the polyurea coating is 0.5-6 mm, as long as the thickness of the polyurea coating is not less than the thickness of the polyurethane coating. For example, the thickness of the polyurethane coating can be 0.1 mm, 0.3 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.6 mm, 1.8 mm, 2 mm, etc., and the thickness of the polyurea coating can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, etc. For instance, when the thickness of the polyurethane coating is 0.2 mm, the thickness of the polyurea coating can be 0.25 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc.; when the thickness of the polyurethane coating is 0.5 mm, the thickness of the polyurea coating can be 0.6 mm, 0.7 mm, 0.8 mm, 1 mm, etc.

[0029] In some embodiments, a discontinuous polyurea coating fills several perforated areas; Alternatively, there may be gaps between the discontinuous polyurea coating and several perforated areas.

[0030] In this invention, the discontinuous polyurea coating can completely fill several perforated areas, meaning the polyurea coating is in direct contact with the polyurethane coating; alternatively, the discontinuous polyurea coating can be distributed within several perforated areas but not in direct contact with the polyurethane coating, meaning gaps exist between the polyurea coating and the polyurethane coating. The shape of the polyurea coating can match the shape of the perforated areas, for example, both the polyurea coating and the perforated areas can be circular, elliptical, square, etc.; alternatively, the shape of the polyurea coating can be mismatched with the shape of the perforated areas, for example, the polyurea coating is circular and the perforated areas are square.

[0031] In some embodiments, when the discontinuous polyurea coating is located on the surface of the continuous polyurethane coating away from the fabric, the thickness of the polyurethane coating is 0.1-2 mm, and the thickness of the polyurea coating is 0.01-1 mm. Using this technical solution, the polyurea coating is directly on the surface of the polyurethane coating, and the polyurea coating at the protruding position of the printed coating provides abrasion resistance. For example, the thickness of the polyurethane coating can be 0.1 mm, 0.3 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.6 mm, 1.8 mm, 2 mm, etc., and the thickness of the polyurea coating can be 0.01 mm, 0.05 mm, 0.1 mm, 0.3 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, etc. Further, the thickness of the polyurea coating is 0.1-1 mm.

[0032] In some embodiments, the polyurea coating is selected from aspartic polyurea coating; The polyurea coating can be regular or irregular in shape, and the length of the polyurea coating's projection onto a plane perpendicular to the fabric does not exceed 2 cm.

[0033] The aspartic polyurea paste used for aspartic polyurea coatings has a relatively long working time; for example, by adjusting the formula, the gel time can reach 20-120 minutes, suitable for printing operations. The polyurea coating can be in regular shapes such as circles, squares, ovals, and lines, or it can be irregular shapes. The projection length of the polyurea coating onto a plane perpendicular to the fabric should not exceed 2 cm to avoid the coating being too large and affecting the flexibility of the printing coating in certain applications. For larger areas of printing coatings, the size of the polyurea coating can be relatively large; for smaller areas, the size can be relatively small. Those skilled in the art can set the size as needed. There are no particular restrictions on the aspartic polyurea paste used for aspartic polyurea coatings. For example, it can consist of component A and component B. The raw materials of component A may include aspartic ester resin (such as Covestro NH1420 and NH1520), dispersant, anti-settling agent, thickener, defoamer, etc., while the raw materials of component B may include isocyanate curing agent, thickener, water-absorbing agent, etc.

[0034] In some embodiments, the discontinuous polyurea coating is divided into several regions, and the thickness of the polyurea coating in the several regions may be the same or different. Alternatively, the polyurea coatings in several areas may have the same or different shapes.

[0035] In this invention, the design of the polyurea coating is highly flexible; the thickness and shape of the polyurea coating in different areas can be the same or different. For example, the polyurethane coating is 1mm thick, the hollowed-out areas of the polyurethane coating are circular with a size of 2mm, and the polyurea coating fills the hollowed-out areas. The polyurea coating is divided into 4 areas, and the thicknesses of the polyurea coating in the 4 areas are 1.1mm, 1.05mm, 1.2mm, and 1.3mm, respectively. The different thicknesses result in a stronger three-dimensional effect of the printed coating.

[0036] On the other hand, the present invention also proposes a method for preparing the printed coated fabric described in any of the above embodiments. Method 1: Polyurethane paste with a hollow pattern is printed on the fabric using a screen printing plate, dried to form a continuous polyurethane coating; polyurea paste is printed at the hollow pattern positions of the continuous polyurethane coating, dried to form a discontinuous polyurea coating, and the printed coated fabric is obtained. Alternatively, preparation method two: print polyurethane paste on the fabric, dry it to form a continuous polyurethane coating; print polyurea paste on the continuous polyurethane coating, dry it to form a discontinuous polyurea coating, and obtain the printed coated fabric.

[0037] Two different preparation methods can be used to address the two different methods of setting discontinuous polyurea coatings. In the printed coated fabric obtained by preparation method one, both the polyurethane coating and the polyurea coating are directly attached to the fabric surface, with the polyurea coating dispersed within the perforated areas of the polyurethane coating, forming a discontinuous state. In the printed coated fabric obtained by preparation method two, the polyurea coating is attached on top of the polyurethane coating and is dispersed and discontinuous. The printed coated fabrics obtained by both preparation methods combine the flexural resistance of polyurethane with the abrasion resistance of aspartic polyurea.

[0038] In some embodiments, the polyurethane slurry is selected from water-based polyurethane slurries; water-based polyurethane slurries have good environmental performance. The polyurea slurry is an aspartic polyurea slurry, with a viscosity of 50,000-150,000 cps at 25°C. Aspartic polyurea slurry has a high solids content (up to 95% or more), and may contain little or no organic solvents, making it environmentally friendly. Both waterborne polyurethane slurries and aspartic polyurea slurries are commercially available or can be formulated using existing technologies.

[0039] 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.

[0040] Example 1 The structural schematic diagram of the printed coated fabric in this embodiment is attached. Figure 1 As shown, the printed coated fabric includes fabric 1 and a printed coating; The printing coating is located on the surface of fabric 1, and the printing coating comprises a continuous polyurethane coating 2 and a discontinuous polyurea coating 3; The continuous polyurethane coating 2 has multiple perforated patterns, while the discontinuous polyurea coating 3 is dispersed among these perforated patterns and fills them completely. The thickness of the polyurethane coating 2 is 0.5 mm, and the thickness of the polyurea coating 3 is 1.0 mm.

[0041] The preparation method of the printed coated fabric in this embodiment is as follows: Water-based polyurethane paste (obtained directly from the market) is screen-printed onto the fabric using a screen with a perforated pattern. The paste is then dried in a 60°C oven for 20 minutes to form a continuous polyurethane coating. The polyurethane coating has multiple perforated areas, each circular with a diameter of 2.5 mm. At the perforated areas of the continuous polyurethane coating, an aspartic polyurea paste is printed using a perforated screen (the perforation pattern of the screen corresponds to the perforation area). After printing, the paste is dried in a 60°C oven for 24 hours to form a discontinuous polyurea coating, thus obtaining the printed coated fabric. A physical image of the printed coated fabric in this embodiment is attached. Figure 2 As shown.

[0042] The above-mentioned aspartic polyurea slurry consists of component A and component B.

[0043] 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.

[0044] 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.

[0045] The aspartic polyurea slurry was obtained by mixing component A and component B at a ratio of 100:70 (by weight) until homogeneous. The viscosity (rotational viscometer, 7.5 r, 25 °C) was 90,000 cps.

[0046] Example 2 The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the thickness of the polyurea coating 3 was adjusted from 1.0 mm to 0.55 mm, meaning the thickness of the polyurea coating is 0.05 mm greater than the thickness of the polyurethane coating. The remaining steps remain unchanged.

[0047] Example 3 The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the thickness of the polyurea coating 3 was adjusted from 1.0 mm to 0.5 mm, meaning the thickness of the polyurea coating is equal to the thickness of the polyurethane coating. The remaining steps remain unchanged.

[0048] Example 4 The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the thickness of the polyurea coating 3 was adjusted from 1.0 mm to 0.4 mm, meaning the thickness of the polyurea coating is 0.1 mm less than the thickness of the polyurethane coating. The remaining steps remain unchanged.

[0049] Comparative Example 1 The difference between this comparative example and Example 1 is that Example 1 does not contain a polyurea coating; the printed coating only contains a continuous polyurethane coating, which is formed by screen printing on the fabric using a water-based polyurethane paste. The remaining steps remain unchanged.

[0050] Comparative Example 2 The difference between this comparative example and Example 1 is that Example 1 does not contain a polyurethane coating; the printed coating only contains a continuous polyurea coating, which is formed by screen printing an aspartic polyurea paste onto the fabric. The remaining steps remain unchanged.

[0051] The abrasion resistance and flexural strength of the printed coated fabrics of Examples 1-4 and Comparative Examples 1-2 are compared in Table 1 below.

[0052] Abrasion resistance: Tested according to ASTM D3886-22.

[0053] Flexural strength: Tested according to the method of GB / T 12586-2003.

[0054] Table 1

[0055] Therefore, as shown in Table 1, the polyurea coating provided in the perforated areas of the polyurethane coating in this invention can significantly improve the abrasion resistance of the printed coating, while the retention rate of flexural resistance is around 90%. For example, when the thickness of the polyurea coating and the polyurethane coating are the same (Example 3), the abrasion resistance increases by 2.9 times; when the thickness of the polyurea coating is 0.05 mm greater than that of the polyurethane coating (Example 2), the abrasion resistance increases by 3.3 times; and when the thickness of the polyurea coating is only 80% of the thickness of the polyurethane coating (Example 4), the abrasion resistance increases by 2.4 times.

[0056] Example 5 The structural schematic diagram of the printed coated fabric in this embodiment is attached. Figure 3 As shown, the printed coated fabric comprises fabric 4 and a printed coating; The printing coating is located on the surface of the fabric 4, and the printing coating includes a continuous polyurethane coating 5 and a discontinuous polyurea coating 6; The continuous polyurethane coating 5 is in direct contact with the fabric, while the discontinuous polyurea coating 6 is located on the surface of the continuous polyurethane coating 5 away from the fabric 4. The thickness of the polyurethane coating 5 is 0.3 mm, and the thickness of the polyurea coating 6 is 0.01 mm. The discontinuous polyurea coating 6 consists of dispersed dot-like particles with a particle size of 2 mm.

[0057] The preparation method of the printed coated fabric in this embodiment is as follows: water-based polyurethane paste (obtained directly from the market) is screen-printed onto the fabric using a screen printing plate, and dried in an oven at 60°C for 20 minutes to form a continuous polyurethane coating; aspartic polyurea paste (aspartic polyurea paste in Example 1) is screen-printed onto the surface of the continuous polyurethane coating using a screen printing plate with a hollow pattern, and dried in an oven at 60°C for 24 hours after printing to obtain the printed coated fabric.

[0058] Example 6 The difference between this embodiment and Embodiment 5 is that in Embodiment 5, the thickness of the polyurea coating 6 was adjusted from 0.01 mm to 0.1 mm. The remaining steps remain unchanged.

[0059] Example 7 The difference between this embodiment and Embodiment 5 is that in Embodiment 5, the thickness of the polyurea coating 6 was adjusted from 0.01 mm to 0.3 mm. The remaining steps remain unchanged.

[0060] Comparative Example 3 The printed coating in this comparative example is the continuous polyurethane coating in Example 5, i.e., the printed coating does not contain a polyurea coating.

[0061] The results of Examples 5-7 and Comparative Example 3, according to the above-described abrasion resistance and flexural resistance test methods, are shown in Table 2 below.

[0062] Table 2

[0063] Therefore, as can be seen from the results in Table 2 above, the printing coating of the present invention continues to provide a discontinuous polyurea coating on the polyurethane coating, which can significantly improve the wear resistance of the printing coating, but has a low impact on the flexibility.

[0064] 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 printed coated fabric, characterized in that, Includes fabric and printed coating; The printed coating is located on the surface of the fabric; The printed coating comprises a continuous polyurethane coating and a discontinuous polyurea coating; The continuous polyurethane coating has several hollowed-out patterns, and the discontinuous polyurea coating is dispersed among the several hollowed-out patterns. The thickness of the polyurea coating is not less than the thickness of the polyurethane coating. Alternatively, the discontinuous polyurea coating may be located on the surface of the continuous polyurethane coating away from the fabric.

2. The printed coated fabric according to claim 1, characterized in that, When the discontinuous polyurea coating is dispersed in the plurality of hollowed-out patterns, the thickness of the polyurea coating is greater than the thickness of the polyurethane coating; The various hollowed-out flower positions are not connected to each other.

3. The printed coated fabric according to claim 2, characterized in that, The thickness of the polyurea coating is 0.05 mm or more greater than the thickness of the polyurethane coating.

4. The printed coated fabric according to claim 2, characterized in that, The thickness of the polyurethane coating is 0.1-2 mm, and the thickness of the polyurea coating is 0.5-6 mm.

5. The printed coated fabric according to claim 2, characterized in that, The discontinuous polyurea coating fills the plurality of hollowed-out patterns; Alternatively, there may be gaps between the discontinuous polyurea coating and the plurality of perforated patterns.

6. The printed coated fabric according to claim 1, characterized in that, When the discontinuous polyurea coating is located on the surface of the continuous polyurethane coating away from the fabric, the thickness of the polyurethane coating is 0.1-2 mm, and the thickness of the polyurea coating is 0.01-1 mm.

7. The printed coated fabric according to claim 1, characterized in that, The polyurea coating is selected from aspartic polyurea coating; The polyurea coating has a regular or irregular shape, and the length of the projection of the polyurea coating onto a plane perpendicular to the fabric does not exceed 2 cm.

8. The printed coated fabric according to claim 1, characterized in that, The discontinuous polyurea coating is divided into several regions, and the thickness of the polyurea coating in the several regions may be the same or different. Alternatively, the polyurea coatings in the aforementioned regions may have the same or different shapes.

9. A method for preparing the printed coated fabric according to any one of claims 1-8, characterized in that, Polyurethane paste with a hollowed-out pattern is screen-printed onto the fabric and dried to form a continuous polyurethane coating; polyurea paste is then printed at the hollowed-out areas of the continuous polyurethane coating and dried to form a discontinuous polyurea coating, thus obtaining the printed coated fabric. Alternatively, a polyurethane paste is printed on the fabric and dried to form the continuous polyurethane coating; a polyurea paste is printed on the continuous polyurethane coating and dried to form the discontinuous polyurea coating, thereby obtaining the printed coated fabric.

10. The method for preparing the printed coated fabric according to claim 9, characterized in that, The polyurethane slurry is selected from water-based polyurethane slurries; The polyurea slurry is an aspartic polyurea slurry, and the viscosity of the aspartic polyurea slurry at 25°C is 50,000-150,000 cps.

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