Water-based orange-peel paint, coating, fabric and preparation method of water-based orange-peel paint

Abstract

The invention relates to a water-based orange-peel paint, a coating, a fabric and a preparation method thereof. The water-based resin dispersion contained in the coating forms a film on the surface of the coating, and the high-solid-content high-molecular-weight water-based anionic polyurethane emulsion dispersion is arranged in the coating; the surface tension of the surface of the coating is changed due to different curing speeds and curing shrinkage rates inside and outside the coating, and finally orange-peel textures are formed. The coating and the coating are simple in component and process, green and environment-friendly, and the formed coating is clear in orange-peel texture, strong in stereoscopic impression and strong in mechanical property.

Description

Technical Field

[0001] The present application relates to the field of textiles, and in particular to a water-based orange-grain paint, coating, fabric and a preparation method thereof. Background Art

[0002] Orange peel morphology usually refers to the effect of orange peel texture in paint, coating or surface treatment. This effect can be achieved in a variety of ways, depending on the materials and processes used. Currently, spray paint is commonly used, and its effect is usually achieved by adjusting the fluidity or solvent evaporation rate with additives; or using fast-evaporating solvents to make the paint evaporate quickly, which often contains organic solvents. Or adjust the spray parameters to control the atomization effect and deposition method through pressure, distance and speed, but it requires a high level of operator skills; control the drying conditions so that the surface drying speed is inconsistent, forming texture, which requires high equipment; treat the underlying substrate and enhance the texture through grinding, polishing or embossing processes, which will increase labor costs. Summary of the invention

[0003] In view of the above problems, the present application provides a water-based orange-peel paint, coating, fabric and preparation method thereof. The water-based resin dispersion contained in the paint forms a film on the surface of the coating, while the high-solid-content high-molecular-weight water-based anionic polyurethane emulsion dispersion is inside the coating; the coating surface changes in surface tension due to the difference in curing speed and curing shrinkage inside and outside the coating, and finally forms an orange-peel texture. The paint and coating have simple components and processes, and are green and environmentally friendly. The formed coating has a clear orange-peel texture, a strong three-dimensional sense, and strong mechanical properties.

[0004] The first aspect of the present application provides a water-based orange-peel paint, which includes a water-based resin dispersion, water, and a high molecular weight water-based anionic polyurethane emulsion dispersion; the water-based resin dispersion is at least one of a water-based polyurethane resin and a water-based polyurethane modified acrylic emulsion.

[0005] Different from the prior art, the high-solid-content, high-molecular-weight aqueous anionic polyurethane emulsion dispersion in the coating is incompatible with the aqueous resin dispersion, and the curing shrinkage is also different. Therefore, after the coating is used, the aqueous resin dispersion will quickly form a uniform semi-solid film on the surface of the coating due to its low surface tension and high volatility, while the high-solid-content, high-molecular-weight aqueous anionic polyurethane emulsion dispersion is in liquid form inside the coating; and the coating surface cures quickly, while the coating cures slowly inside. Due to the difference in curing speed and curing shrinkage inside and outside the coating, the surface tension of the coating changes, and eventually an orange-peel texture is formed. In addition, the aqueous resin dispersion itself has excellent mechanical properties, the coating has high hydrolysis resistance, wear resistance and flexibility resistance, is non-toxic and non-irritating, and meets environmental protection requirements.

[0006] Furthermore, the aqueous resin dispersion includes aqueous polyurethane resin and aqueous polyurethane modified acrylic emulsion; the two resins have different curing speeds and curing shrinkage rates, and the surface tension of the coating will also change, thereby increasing the orange peel effect of the coating.

[0007] Furthermore, the solid content of the high molecular weight aqueous anionic polyurethane emulsion dispersion is 40-60wt%; the mass ratio of the aqueous resin dispersion, water, and high molecular weight aqueous anionic polyurethane emulsion dispersion is 60-80:20-40:100-900.

[0008] Furthermore, the water-based orange peel paint also includes a curing agent.

[0009] The addition of curing agent also increases the difference in curing speed and curing shrinkage between the coating surface and interior, thereby deepening the orange peel texture on the coating surface and improving the clarity of the orange peel.

[0010] Furthermore, the curing agent is one or more of a hydrophilic aliphatic isocyanate curing agent based on HDI and an ionic modified isocyanate curing agent.

[0011] The HDI-based hydrophilic aliphatic isocyanate curing agent increases the difference in curing rate and curing shrinkage between the coating surface and interior through cross-linking curing reaction, causing changes in the coating surface tension, thereby enhancing the three-dimensional sense of the orange peel texture.

[0012] Ionic modified isocyanate curing agents also improve their compatibility with high-solid content and high-molecular-weight aqueous anionic polyurethane emulsion dispersions through ion modification, enhance the adhesion of the coating, and improve the stability and durability of the coating.

[0013] Furthermore, the curing agent includes a hydrophilic aliphatic isocyanate curing agent based on HDI and an ionic modified isocyanate curing agent.

[0014] The combination of the two curing agents increases the difference in curing rate and curing shrinkage between the coating surface and the interior, which can further increase the tension change on the coating surface, and contribute to the clarity and three-dimensional sense of the orange-peel texture. At the same time, the mechanical effect of the coating can be increased through the cross-linking curing reaction of the curing agent.

[0015] Furthermore, the water-based orange peel paint also includes an auxiliary agent, which includes a pH stabilizer, an antimicrobial preservative, a defoamer, and a thickener. The antimicrobial preservative can effectively inhibit the growth of microorganisms and extend the shelf life and service life of the paint. The defoamer eliminates bubbles in the coating and improves the surface quality. The pH stabilizer adjusts the pH value of the coating to maintain stability and extend the shelf life.

[0016] Furthermore, the pH stabilizer is one or more of 2-amino-2-methyl-1-propanol and 2-methyl-2-methylamino-1-propanol.

[0017] Furthermore, the antibacterial preservative is one or more of 5-chloro-2-methyl-1-isothiazoline-3-one and 2-methyl-1-isothiazoline-3-one.

[0018] The second aspect of the present application provides a method for preparing a water-based orange peel coating, comprising the following steps: S1: stirring an auxiliary agent, water and a water-based resin dispersion to obtain a first mixture; the water-based resin dispersion is at least one of a water-based polyurethane resin and a water-based polyurethane modified acrylic emulsion;

[0019] S2: adding the first mixture to a high molecular weight aqueous anionic polyurethane emulsion dispersion having a solid content of 40-60 wt %, stirring evenly to obtain a second mixture;

[0020] S3: Add a curing agent to the second mixture and mix them evenly to obtain the water-based orange peel paint.

[0021] Different from the prior art, the high solid content and high molecular weight aqueous anionic polyurethane emulsion dispersion in the coating is incompatible with the aqueous resin dispersion, and the curing shrinkage is also different. Therefore, after the coating is used, the aqueous resin dispersion will quickly form a uniform semi-solid film on the surface of the coating due to its low surface tension and high volatility, while the high solid content and high molecular weight aqueous anionic polyurethane emulsion dispersion is in a liquid state inside the coating; and the coating surface cures quickly, while the coating inside cures slowly. Due to the difference in curing speed and curing shrinkage inside and outside the coating, the surface tension of the coating changes, and finally forms an orange peel texture. At the same time, the addition of the curing agent also increases the difference in curing speed and curing shrinkage between the surface and inside of the coating, thereby deepening the orange peel texture on the surface of the coating and improving the clarity of the orange peel. In addition, the aqueous resin dispersion itself has excellent mechanical properties, improves the wear resistance and flexibility resistance of the coating, is non-toxic and non-irritating, and meets environmental protection requirements.

[0022] Furthermore, the aqueous resin dispersion includes aqueous polyurethane resin and aqueous polyurethane modified acrylic emulsion; the two resins have different curing speeds and curing shrinkage rates, the surface tension of the coating will also change, and the orange peel effect of the coating will also increase.

[0023] Furthermore, the mass ratio of the aqueous resin dispersion to water is 60-80:20-40.

[0024] Furthermore, the auxiliary agent includes a pH stabilizer, an antimicrobial preservative, a defoamer, and a thickener. The antimicrobial preservative can effectively inhibit the growth of microorganisms and extend the storage period and service life of the coating. The defoamer eliminates bubbles in the coating and improves the surface quality.

[0025] pH stabilizers adjust the pH of the coating, maintaining stability and extending shelf life.

[0026] Furthermore, the pH stabilizer is one or more of 2-amino-2-methyl-1-propanol and 2-methyl-2-methylamino-1-propanol.

[0027] Furthermore, the antibacterial preservative is one or more of 5-chloro-2-methyl-1-isothiazoline-3-one and 2-methyl-1-isothiazoline-3-one.

[0028] Furthermore, in the step S1, the mass ratio of the aqueous resin dispersion, pH stabilizer, antimicrobial preservative, defoamer, thickener and water is 60-80: 0.1-1: 0.01-0.1: 0.1-0.5: 0.2-0.6: 20-40.

[0029] Furthermore, in the step S2, the mass ratio of the first mixture to the high molecular weight aqueous anionic polyurethane emulsion dispersion is 100-105:100-900.

[0030] Furthermore, the mass ratio of the aqueous resin dispersion, water, and high molecular weight aqueous anionic polyurethane emulsion dispersion is 60-80:20-40:100-900.

[0031] Furthermore, the amount of the curing agent is 1-5 wt % of the second mixture.

[0032] Furthermore, the curing agent is one or more of a hydrophilic aliphatic isocyanate curing agent based on HDI and an ionic modified isocyanate curing agent.

[0033] The HDI-based hydrophilic aliphatic isocyanate curing agent increases the difference in curing rate and curing shrinkage between the coating surface and interior through cross-linking curing reaction, causing changes in the coating surface tension, thereby enhancing the three-dimensional sense of the orange peel texture.

[0034] Ionic modified isocyanate curing agents also improve their compatibility with high-solid content and high-molecular-weight aqueous anionic polyurethane emulsion dispersions through ion modification, enhance the adhesion of the coating, and improve the stability and durability of the coating.

[0035] Furthermore, the curing agent includes a hydrophilic aliphatic isocyanate curing agent based on HDI and an ionic modified isocyanate curing agent.

[0036] The combination of the two curing agents increases the difference in curing rate and curing shrinkage between the coating surface and the interior, which can further increase the tension change on the coating surface, and contribute to the clarity and three-dimensional sense of the orange-peel texture. At the same time, the mechanical effect of the coating can be increased through the cross-linking curing reaction of the curing agent.

[0037] The second aspect of the present application provides a water-based orange-peel paint, which is prepared using the preparation method described in the first aspect of the present application.

[0038] Different from the prior art, the high solid content and high molecular weight aqueous anionic polyurethane emulsion dispersion in the coating is incompatible with the aqueous resin dispersion, and the curing shrinkage is also different. Therefore, after the coating is used, the aqueous resin dispersion will quickly form a uniform semi-solid film on the surface of the coating due to its low surface tension and high volatility, while the high solid content and high molecular weight aqueous anionic polyurethane emulsion dispersion is in a liquid state inside the coating; and the coating surface cures quickly, while the coating inside cures slowly. Due to the difference in curing speed and curing shrinkage inside and outside the coating, the surface tension of the coating changes, and finally forms an orange peel texture. At the same time, the addition of the curing agent also increases the difference in curing speed and curing shrinkage between the surface and inside of the coating, thereby deepening the orange peel texture on the surface of the coating and improving the clarity of the orange peel. In addition, the aqueous resin dispersion itself has excellent mechanical properties, improves the wear resistance and flexibility resistance of the coating, is non-toxic and non-irritating, and meets environmental protection requirements.

[0039] The third aspect of the present application provides a water-based orange-peel coating, which is printed by screen printing using the water-based orange-peel coating described in the first aspect of the present application.

[0040] Different from the existing technology, the coating surface is mainly water-based resin dispersion, while the coating interior is mainly high-solid content high molecular weight water-based anionic polyurethane emulsion dispersion. The orange peel on the coating surface is due to the difference in curing speed and curing shrinkage on the coating surface or inside and outside the coating, which causes the change in surface tension and eventually forms the orange peel texture.

[0041] The fourth aspect of the present application provides a water-based orange-grain coated fabric, on which the water-based orange-grain coating described in the third aspect of the present application is printed.

[0042] Different from the existing technology, the water-based orange-peel coating on the fabric is mainly a water-based resin dispersion on the coating surface, and the interior of the coating is mainly a high-solid content and high-molecular-weight water-based anionic polyurethane emulsion dispersion. The orange peel on the coating surface is due to the difference in curing speed and curing shrinkage on the coating surface or inside and outside the coating, which causes the change in surface tension and ultimately forms an orange peel texture.

[0043] The above-mentioned records related to the invention content are only an overview of the technical solution of the present application. In order to enable ordinary technicians in the field to more clearly understand the technical solution of the present application, and then implement it according to the written contents of the specification, and to make the above-mentioned purpose and other purposes, features and advantages of the present application easier to understand, the specific implementation mode and drawings of the present application are explained below. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The drawings are only used to illustrate the principles, implementation methods, applications, characteristics and effects of the specific embodiments of the present application and other related contents, and shall not be considered as limitations of the present application.

[0045] In the drawings of the specification:

[0046] Figure 1 This is a partial enlarged view of the orange-peel coating prepared in Example 2. DETAILED DESCRIPTION

[0047] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] Similar to the understanding in the 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.

[0054] The first aspect of the present application provides a water-based orange-peel paint, which includes a water-based resin dispersion, water, and a high molecular weight water-based anionic polyurethane emulsion dispersion; the water-based resin dispersion is at least one of a water-based polyurethane resin and a water-based polyurethane modified acrylic emulsion.

[0055] Different from the prior art, the high-solid content and high-molecular-weight aqueous anionic polyurethane emulsion dispersion in the coating is incompatible with the aqueous resin dispersion, and the curing shrinkage is also different. Therefore, after the coating is used, the aqueous resin dispersion will quickly form a uniform semi-solid film on the surface of the coating due to its low surface tension and high volatility, while the high-solid content and high-molecular-weight aqueous anionic polyurethane emulsion dispersion is in liquid form inside the coating; and the coating surface cures quickly, while the coating cures slowly inside. Due to the different curing speeds and curing shrinkages inside and outside the coating, the surface tension of the coating changes, and eventually an orange-peel texture is formed. In addition, the aqueous resin dispersion itself has excellent mechanical properties, the coating has high wear resistance and flexibility resistance, is non-toxic and non-irritating, and meets environmental protection requirements.

[0056] Furthermore, the aqueous resin dispersion includes aqueous polyurethane resin and aqueous polyurethane modified acrylic emulsion; the two resins have different curing speeds and curing shrinkage rates, and the surface tension of the coating will also change, thereby increasing the orange peel effect of the coating.

[0057] Furthermore, the solid content of the high molecular weight aqueous anionic polyurethane emulsion dispersion is 40-60wt%; the mass ratio of the aqueous resin dispersion, water, and high molecular weight aqueous anionic polyurethane emulsion dispersion is 60-80:20-40:100-900.

[0058] Furthermore, the water-based orange peel paint also includes a curing agent.

[0059] The addition of curing agent also increases the difference in curing speed and curing shrinkage between the coating surface and interior, thereby deepening the orange peel texture on the coating surface and improving the clarity of the orange peel.

[0060] Furthermore, the curing agent is one or more of a hydrophilic aliphatic isocyanate curing agent based on HDI and an ionic modified isocyanate curing agent.

[0061] The HDI-based hydrophilic aliphatic isocyanate curing agent increases the difference in curing rate and curing shrinkage between the coating surface and interior through cross-linking curing reaction, causing changes in the coating surface tension, thereby enhancing the three-dimensional sense of the orange peel texture.

[0062] Ionic modified isocyanate curing agents also improve their compatibility with high-solid content and high-molecular-weight aqueous anionic polyurethane emulsion dispersions through ion modification, enhance the adhesion of the coating, and improve the stability and durability of the coating.

[0063] Furthermore, the curing agent includes a hydrophilic aliphatic isocyanate curing agent based on HDI and an ionic modified isocyanate curing agent.

[0064] The combination of the two curing agents increases the difference in curing rate and curing shrinkage between the coating surface and the interior, which can further increase the tension change on the coating surface, and contribute to the clarity and three-dimensional sense of the orange-peel texture. At the same time, the mechanical effect of the coating can be increased through the cross-linking curing reaction of the curing agent.

[0065] Furthermore, the water-based orange peel paint also includes an auxiliary agent, which includes a pH stabilizer, an antimicrobial preservative, a defoamer, and a thickener. The antimicrobial preservative can effectively inhibit the growth of microorganisms and extend the shelf life and service life of the paint. The defoamer eliminates bubbles in the coating and improves the surface quality. The pH stabilizer adjusts the pH value of the coating to maintain stability and extend the shelf life.

[0066] Furthermore, the pH stabilizer is one or more of 2-amino-2-methyl-1-propanol and 2-methyl-2-methylamino-1-propanol.

[0067] Furthermore, the antibacterial preservative is one or more of 5-chloro-2-methyl-1-isothiazoline-3-one and 2-methyl-1-isothiazoline-3-one.

[0068] The second aspect of the present application provides a method for preparing a water-based orange peel coating, comprising the following steps: S1: stirring an auxiliary agent, water and a water-based resin dispersion to obtain a first mixture; the water-based resin dispersion is at least one of a water-based polyurethane resin and a water-based polyurethane modified acrylic emulsion;

[0069] S2: adding the first mixture to a high molecular weight aqueous anionic polyurethane emulsion dispersion having a solid content of 40-60 wt %, stirring evenly to obtain a second mixture;

[0070] S3: Add a curing agent to the second mixture and mix them evenly to obtain the water-based orange peel paint.

[0071] Different from the prior art, the high solid content and high molecular weight aqueous anionic polyurethane emulsion dispersion in the coating is incompatible with the aqueous resin dispersion, and the curing shrinkage is also different. Therefore, after the coating is used, the aqueous resin dispersion will quickly form a uniform semi-solid film on the surface of the coating due to its low surface tension and high volatility, while the high solid content and high molecular weight aqueous anionic polyurethane emulsion dispersion is in a liquid state inside the coating; and the coating surface cures quickly, while the coating inside cures slowly. Due to the difference in curing speed and curing shrinkage inside and outside the coating, the surface tension of the coating changes, and finally forms an orange peel texture. At the same time, the addition of the curing agent also increases the difference in curing speed and curing shrinkage between the surface and inside of the coating, thereby deepening the orange peel texture on the surface of the coating and improving the clarity of the orange peel. In addition, the aqueous resin dispersion itself has excellent mechanical properties, improves the wear resistance and flexibility resistance of the coating, is non-toxic and non-irritating, and meets environmental protection requirements.

[0072] Furthermore, the aqueous resin dispersion includes aqueous polyurethane resin and aqueous polyurethane modified acrylic emulsion; the two resins have different curing speeds and curing shrinkage rates, the surface tension of the coating will also change, and the orange peel effect of the coating will also increase.

[0073] Furthermore, the mass ratio of the aqueous resin dispersion to water is 60-80:20-40.

[0074] Furthermore, the auxiliary agent includes a pH stabilizer, an antimicrobial preservative, a defoamer, and a thickener. The antimicrobial preservative can effectively inhibit the growth of microorganisms and extend the storage period and service life of the coating. The defoamer eliminates bubbles in the coating and improves the surface quality.

[0075] pH stabilizers adjust the pH of the coating, maintaining stability and extending shelf life.

[0076] Furthermore, the pH stabilizer is one or more of 2-amino-2-methyl-1-propanol and 2-methyl-2-methylamino-1-propanol.

[0077] Furthermore, the antibacterial preservative is one or more of 5-chloro-2-methyl-1-isothiazoline-3-one and 2-methyl-1-isothiazoline-3-one.

[0078] Furthermore, in the step S1, the mass ratio of the aqueous resin dispersion, pH stabilizer, antimicrobial preservative, defoamer, thickener and water is 60-80: 0.1-1: 0.01-0.1: 0.1-0.5: 0.2-0.6: 20-40.

[0079] Furthermore, in the step S2, the mass ratio of the first mixture to the high molecular weight aqueous anionic polyurethane emulsion dispersion is 100-105:100-900.

[0080] Furthermore, the mass ratio of the aqueous resin dispersion, water, and high molecular weight aqueous anionic polyurethane emulsion dispersion is 60-80:20-40:100-900.

[0081] Furthermore, the amount of the curing agent is 1-5 wt % of the second mixture.

[0082] Furthermore, the curing agent is one or more of a hydrophilic aliphatic isocyanate curing agent based on HDI and an ionic modified isocyanate curing agent.

[0083] The HDI-based hydrophilic aliphatic isocyanate curing agent increases the difference in curing rate and curing shrinkage between the coating surface and interior through cross-linking curing reaction, causing changes in the coating surface tension, thereby enhancing the three-dimensional sense of the orange peel texture.

[0084] Ionic modified isocyanate curing agents also improve their compatibility with high-solid content and high-molecular-weight aqueous anionic polyurethane emulsion dispersions through ion modification, enhance the adhesion of the coating, and improve the stability and durability of the coating.

[0085] Furthermore, the curing agent includes a hydrophilic aliphatic isocyanate curing agent based on HDI and an ionic modified isocyanate curing agent.

[0086] The combination of the two curing agents increases the difference in curing rate and curing shrinkage between the coating surface and the interior, which can further increase the tension change on the coating surface, and contribute to the clarity and three-dimensional sense of the orange-peel texture. At the same time, the mechanical effect of the coating can be increased through the cross-linking curing reaction of the curing agent.

[0087] The second aspect of the present application provides a water-based orange-peel paint, which is prepared using the preparation method described in the first aspect of the present application.

[0088] Different from the prior art, the high solid content and high molecular weight aqueous anionic polyurethane emulsion dispersion in the coating is incompatible with the aqueous resin dispersion, and the curing shrinkage is also different. Therefore, after the coating is used, the aqueous resin dispersion will quickly form a uniform semi-solid film on the surface of the coating due to its low surface tension and high volatility, while the high solid content and high molecular weight aqueous anionic polyurethane emulsion dispersion is in a liquid state inside the coating; and the coating surface cures quickly, while the coating inside cures slowly. Due to the difference in curing speed and curing shrinkage inside and outside the coating, the surface tension of the coating changes, and finally forms an orange peel texture. At the same time, the addition of the curing agent also increases the difference in curing speed and curing shrinkage between the surface and inside of the coating, thereby deepening the orange peel texture on the surface of the coating and improving the clarity of the orange peel. In addition, the aqueous resin dispersion itself has excellent mechanical properties, improves the wear resistance and flexibility resistance of the coating, is non-toxic and non-irritating, and meets environmental protection requirements.

[0089] The third aspect of the present application provides a water-based orange-peel coating, which is printed by screen printing using the water-based orange-peel coating described in the first aspect of the present application.

[0090] Different from the existing technology, the coating surface is mainly water-based resin dispersion, while the coating interior is mainly high-solid content high molecular weight water-based anionic polyurethane emulsion dispersion. The orange peel on the coating surface is due to the difference in curing speed and curing shrinkage on the coating surface or inside and outside the coating, which causes the change in surface tension and eventually forms the orange peel texture.

[0091] The fourth aspect of the present application provides a water-based orange-grain coated fabric, on which the water-based orange-grain coating described in the third aspect of the present application is printed.

[0092] Different from the existing technology, the water-based orange-peel coating on the fabric is mainly a water-based resin dispersion on the coating surface, and the interior of the coating is mainly a high-solid content and high-molecular-weight water-based anionic polyurethane emulsion dispersion. The orange peel on the coating surface is due to the difference in curing speed and curing shrinkage on the coating surface or inside and outside the coating, which causes the change in surface tension and ultimately forms an orange peel texture.

[0093] In this embodiment, the waterborne polyurethane resin is PU polyurethane resin produced by Dongguan Longqin Printing Materials Co., Ltd., the waterborne polyurethane modified acrylic emulsion is DSM NeoPac E-129, and the high molecular weight waterborne anionic polyurethane emulsion dispersion is Covestro waterborne polyurethane emulsion Dispercoll U2643.

[0094] In this embodiment, the curing agent is a mixture of 90 wt% of a hydrophilic aliphatic isocyanate curing agent based on HDI and 10 wt% of an ionic modified isocyanate curing agent. The hydrophilic aliphatic isocyanate curing agent based on HDI is Bayhydur XP 2547 (-NCO content is 20.5-22.5 wt%) produced by Covestro; the ionic modified isocyanate curing agent is: Covestro XP 2655 (-NCO content 20.3-21.3 wt%).

[0095] In this embodiment, the defoaming agent is Digo 902W or Digo 810. The pH regulator is Dow AMP-95. The antibacterial preservative is 5-chloro-2-methyl-1-isothiazoline-3-one.

[0096] In this embodiment, the printing method of the water-based orange-grain coating fabric is: printing the primer paste on the base fabric 3 times and 6 times, printing the color ink 3 times and 6 times, and printing the orange-grain coating once and 2 times after drying. The printing adopts a 120-mesh screen, the primer paste and the color ink are dried at 60°C after printing, and the orange-grain coating is dried naturally.

[0097] Example 1 A water-based orange peel paint, coating, and fabric

[0098] S1: 40 parts by mass of an aqueous polyurethane resin, 20 parts by mass of an aqueous polyurethane modified acrylic emulsion, 39 parts by mass of water, 0.5 parts by mass of a pH stabilizer, 0.1 parts by mass of an antibacterial preservative, and 0.2 parts by mass of a thickener are added to a reaction kettle, stirred at high speed, and then 0.2 parts by mass of a defoamer is added after stirring evenly, and stirred at high speed to obtain a first mixture;

[0099] S2: adding the first mixture to a high molecular weight aqueous anionic polyurethane emulsion dispersion having a solid content of 40-60 wt%, stirring evenly to obtain a second mixture; the mass ratio of the first mixture to the high molecular weight aqueous anionic polyurethane emulsion dispersion is 10:90;

[0100] S3: Add 2 wt % of curing agent to the second mixture and mix well to obtain the water-based orange-grain paint. S4: Print the water-based orange-grain paint by screen printing to obtain a water-based orange-grain fabric.

[0101] Example 2 A water-based orange peel paint and coating, fabric

[0102] S1: 40 parts by mass of an aqueous polyurethane resin, 20 parts by mass of an aqueous polyurethane modified acrylic emulsion, 39 parts by mass of water, 0.5 parts by mass of a pH stabilizer, 0.1 parts by mass of an antibacterial preservative, and 0.2 parts by mass of a thickener are added to a reaction kettle, stirred at high speed, and then 0.2 parts by mass of a defoamer is added after stirring evenly, and stirred at high speed to obtain a first mixture;

[0103] S2: adding the first mixture to a high molecular weight aqueous anionic polyurethane emulsion dispersion having a solid content of 40-60 wt%, stirring evenly to obtain a second mixture; the mass ratio of the first mixture to the high molecular weight aqueous anionic polyurethane emulsion dispersion is 15:85;

[0104] S3: Add 2 wt % of curing agent to the second mixture and mix well to obtain the water-based orange-grain paint. S4: Print the water-based orange-grain paint by screen printing to obtain a water-based orange-grain fabric.

[0105] Example 3 A water-based orange peel paint, coating, and fabric

[0106] S1: 40 parts by mass of an aqueous polyurethane resin, 20 parts by mass of an aqueous polyurethane modified acrylic emulsion, 39 parts by mass of water, 0.5 parts by mass of a pH stabilizer, 0.1 parts by mass of an antibacterial preservative, and 0.2 parts by mass of a thickener are added to a reaction kettle, stirred at high speed, and then 0.2 parts by mass of a defoamer is added after stirring evenly, and stirred at high speed to obtain a first mixture;

[0107] S2: adding the first mixture to a high molecular weight aqueous anionic polyurethane emulsion dispersion having a solid content of 40-60 wt%, stirring evenly to obtain a second mixture; the mass ratio of the first mixture to the high molecular weight aqueous anionic polyurethane emulsion dispersion is 15:85;

[0108] S3: Add 5 wt % of curing agent to the second mixture and mix well to obtain the water-based orange-grain paint. S4: Print the water-based orange-grain paint by screen printing to obtain a water-based orange-grain fabric.

[0109] Example 4 A water-based orange peel paint and coating, fabric

[0110] S1: 40 parts by mass of an aqueous polyurethane resin, 20 parts by mass of an aqueous polyurethane modified acrylic emulsion, 39 parts by mass of water, 0.5 parts by mass of a pH stabilizer, 0.1 parts by mass of an antibacterial preservative, and 0.2 parts by mass of a thickener are added to a reaction kettle, stirred at high speed, and then 0.2 parts by mass of a defoamer is added after stirring evenly, and stirred at high speed to obtain a first mixture;

[0111] S2: adding the first mixture to a high molecular weight aqueous anionic polyurethane emulsion dispersion having a solid content of 40-60 wt%, stirring evenly to obtain a second mixture; the mass ratio of the first mixture to the high molecular weight aqueous anionic polyurethane emulsion dispersion is 15:85;

[0112] S3: The second mixture is not added with a curing agent to obtain the water-based orange peel paint.

[0113] S4: Printing with water-based orange-grain paint by screen printing to obtain water-based orange-grain fabric.

[0114] Example 5 A water-based orange peel paint, coating, and fabric

[0115] S1: 40 parts by mass of an aqueous polyurethane resin, 20 parts by mass of an aqueous polyurethane modified acrylic emulsion, 39 parts by mass of water, 0.5 parts by mass of a pH stabilizer, 0.1 parts by mass of an antibacterial preservative, and 0.2 parts by mass of a thickener are added to a reaction kettle, stirred at high speed, and then 0.2 parts by mass of a defoamer is added after stirring evenly, and stirred at high speed to obtain a first mixture;

[0116] S2: adding the first mixture to a high molecular weight aqueous anionic polyurethane emulsion dispersion having a solid content of 40-60 wt%, stirring evenly to obtain a second mixture; the mass ratio of the first mixture to the high molecular weight aqueous anionic polyurethane emulsion dispersion is 30:70;

[0117] S3: Add 2 wt % of curing agent to the second mixture and mix well to obtain the water-based orange-grain paint. S4: Print the water-based orange-grain paint by screen printing to obtain a water-based orange-grain fabric.

[0118] Example 6 A water-based orange peel paint, coating, and fabric

[0119] S1: 40 parts by mass of an aqueous polyurethane resin, 20 parts by mass of an aqueous polyurethane modified acrylic emulsion, 39 parts by mass of water, 0.5 parts by mass of a pH stabilizer, 0.1 parts by mass of an antibacterial preservative, and 0.2 parts by mass of a thickener are added to a reaction kettle, stirred at high speed, and then 0.2 parts by mass of a defoamer is added after stirring evenly, and stirred at high speed to obtain a first mixture;

[0120] S2: adding the first mixture to a high molecular weight aqueous anionic polyurethane emulsion dispersion having a solid content of 40-60 wt%, stirring evenly to obtain a second mixture; the mass ratio of the first mixture to the high molecular weight aqueous anionic polyurethane emulsion dispersion is 40:60;

[0121] S3: Add 2 wt % of curing agent to the second mixture and mix well to obtain the water-based orange-grain paint. S4: Print the water-based orange-grain paint by screen printing to obtain a water-based orange-grain fabric.

[0122] Comparative Example A water-based orange-grain paint, coating and fabric.

[0123] The comparative example coating adopts commercially available polyurethane orange-grain coating to which fumed silica and orange-grain additives are added.

[0124] The preparation method of the water-based orange-grain fabric is the same as that in the embodiment.

[0125] Performance Testing:

[0126] The performance of the polyurethane orange-grain fabrics prepared in the examples and comparative examples was tested.

[0127] The performance test method is as follows: the polyurethane orange grain fabric is dried in a 50°C oven for 24 hours, then taken out and left to stand for 24 hours, and the following tests are performed. The test results are shown in Table 1.

[0128] 1. Hydrolysis test: Soak the fabric in 10% sodium hydroxide solution for 24 hours, and visually inspect whether the orange-grain coating is cracked or peeled off. The wrinkled and peeled area of ​​the orange-grain coating is recorded as S1, and the total area of ​​the fabric is S2, S = S1 / S2: S ≤ 5% is excellent; 5% < S ≤ 10% is good; 10% < S ≤ 20% is qualified, and S > 20% is unqualified.

[0129] 2. Flex test: Take 4 standard samples according to ISO 2418 standard, use Bally bending tester, perform dry test method, and record the number of bends without damage.

[0130] 3. Orange grain effect test: Visual inspection, the clear area of ​​orange grain is recorded as A1, the total area of ​​fabric is A2, A=A1 / A2: A≥95% is obviously clear; 85%≤A<95% is clear; 70%≤A<85% is unclear, A<70% is seriously unclear.

[0131] Table 1 Performance test results

[0132] Hydrolysis resistance Flexibility Orange texture effect Example 1 excellent 150,000 times Clarity Example 2 excellent 150,000 times Clear and clear Example 3 excellent 120,000 times Clarity Example 4 good 120,000 times Unclear Example 5 excellent 150,000 times Unclear Example 6 excellent 150,000 times Unclear Comparative Example good 100,000 times Clarity

[0133] It can be seen from the results of Examples 2 and 3 that adding too much curing agent (5wt%) will cause excessive cross-linking of the coating, increased internal stress, and unbalanced surface tension, which will in turn reduce the mechanical properties of the coating. It can be seen from the results of Examples 2 and 4 that without adding curing agent (0wt%), the coating cannot form a stable three-dimensional network structure, the incompletely cured coating has poor bonding with the substrate, and the mechanical properties are reduced. In Examples 5-6, due to the high content of the water-based resin dispersion and the relatively smooth surface, the coating surface does not shrink enough and the orange peel effect is weak. Users can adjust the content of the water-based resin dispersion as needed to achieve the desired orange peel effect. The orange peel coating prepared in Example 2, as shown locally Figure 1 As shown, the surface is convex and concave, feels comfortable and smooth, and has a good decorative effect. In this embodiment, the preferred amount of curing agent added is 2wt%.

[0134] Meanwhile, compared with the commercially available polyurethane orange-grain paint to which fumed silica and orange-grain additives are added, the water resistance and flexibility resistance of the coating formed by the orange-grain paint in this embodiment are both better than those of the commercially available orange-grain paint.

[0135] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concept of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. A water-based orange peel paint, characterized in that: The water-based orange-strip paint comprises a water-based resin dispersion, water, and a high molecular weight water-based anionic polyurethane emulsion dispersion; the water-based resin dispersion is at least one of a water-based polyurethane resin and a water-based polyurethane modified acrylic emulsion.

2. The water-based orange peel paint according to claim 1, characterized in that: The solid content of the high molecular weight aqueous anionic polyurethane emulsion dispersion is 40-60wt%; the mass ratio of the aqueous resin dispersion, water, and high molecular weight aqueous anionic polyurethane emulsion dispersion is 60-80:20-40:100-900.

3. The water-based orange-grain paint according to claim 1, characterized in that: The water-based orange-grain paint also includes a curing agent; the curing agent is one or more of a hydrophilic aliphatic isocyanate curing agent based on HDI and an ionic modified isocyanate curing agent.

4. The water-based orange-grain paint according to claim 1, characterized in that: The water-based orange peel paint also includes additives, which include pH stabilizers, antibacterial preservatives, defoamers, and thickeners.

5. A method for preparing a water-based orange peel paint, characterized in that: The following steps are involved: S1: stirring an additive, water and an aqueous resin dispersion to obtain a first mixture; the aqueous resin dispersion is at least one of an aqueous polyurethane resin and an aqueous polyurethane modified acrylic emulsion; S2: adding the first mixture to a high molecular weight aqueous anionic polyurethane emulsion dispersion having a solid content of 40-60 wt %, stirring evenly to obtain a second mixture; S3: Add a curing agent to the second mixture and mix them evenly to obtain the water-based orange peel paint.

6. The preparation method according to claim 5, characterized in that: The auxiliary agents include pH stabilizers, antimicrobial preservatives, defoamers and thickeners.

7. The preparation method according to claim 5, characterized in that: The mass ratio of the aqueous resin dispersion, water and high molecular weight aqueous anionic polyurethane emulsion dispersion is 60-80:20-40:100-900.

8. The preparation method according to claim 5, characterized in that: The amount of the curing agent is 1-5wt% of the second mixture; the curing agent is one or more of a hydrophilic aliphatic isocyanate curing agent based on HDI and an ionic modified isocyanate curing agent.

9. A water-based orange peel coating, characterized in that: The water-based orange-peel coating is printed by screen printing using the water-based orange-peel coating described in any one of claims 1 to 4.

10. A water-based orange-grain coated fabric, characterized in that: The fabric is printed with the water-based orange-skin coating according to claim 9.

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