Double-layer suspension coating forming process and decorative plate

Abstract

The invention provides a double-layer suspension coating forming process and a decorative plate, and relates to the technical field of coatings. The invention provides a double-layer suspension forming process which comprises the following steps: brushing polyester magnetic ink on the surface of a to-be-printed plate by utilizing silk-screen printing, baking and curing in a first magnetic field environment to obtain a first coating, then brushing acrylic acid magnetic ink on the surface of the first coating by utilizing silk-screen printing, and drying to obtain a second coating; and drying and curing in a second magnetic field environment to obtain the double-layer suspension coating formed on the surface of the plate. According to the method, the barrier that only single-layer three-dimensional textures can be realized in a traditional electroplating process is broken through, the double-layer suspension three-dimensional coating can be formed, and the path period of coating processing is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a double-layer suspension coating forming process and a decorative plate. Background Art

[0002] In today's era of rapid technological development, the appearance design and manufacturing process of electronic products are constantly being innovated. As an indispensable electronic product in people's daily life, the beauty and uniqueness of the appearance can highlight the personality of consumers, so it is increasingly attracting the attention of consumers. As an important part of the appearance of mobile phones, the application of texture technology on the battery cover not only affects the overall appearance of the mobile phone, but is also closely related to the manufacturing cycle and production cost.

[0003] In the prior art, when decorating the surface of a mobile phone battery cover, electroplating is usually performed on the surface of the plate to transfer a specific texture pattern to the surface of the battery cover, thereby achieving a certain visual effect. However, the electroplating transfer technology can only reflect a single-layer visual three-dimensional effect on the plane of the plate. This limitation makes the texture effect of the mobile phone battery cover relatively single, lacking in layering and three-dimensionality. Under the market demand for personalization and high quality, a single-layer visual perception is difficult to meet the needs of consumers. Therefore, it is urgent to provide a solution to improve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a double-layer suspension coating forming process and a decorative plate.

[0005] In the first aspect, the present invention provides a double-layer suspension molding process, comprising: using screen printing to brush polyester magnetic ink on the surface of a plate to be printed, baking and curing in a first magnetic field environment to obtain a first coating, then using screen printing to brush acrylic magnetic ink on the surface of the first coating, and drying and curing in a second magnetic field environment to obtain a double-layer suspension coating formed on the surface of the plate.

[0006] Optionally, the polyester magnetic ink includes a polyester matrix and a modified magnetic pigment and a first functional auxiliary agent dispersed in the polyester matrix.

[0007] Optionally, the polyester magnetic ink includes, by weight, 30-40 parts of a polyester matrix, 20-30 parts of a modified magnetic pigment, 5-10 parts of a first functional auxiliary agent, and 20-30 parts of a first solvent.

[0008] Optionally, the modified magnetic pigment includes an organic pigment and a modified ferrite composited with the organic pigment; the preparation method of the modified ferrite includes: performing surface activation treatment on the ferrite, stirring and mixing the ferrite with cashew nut shell oil, separating and drying, and then magnetizing to obtain the modified ferrite.

[0009] Optionally, the ferrite includes at least one of barium ferrite and strontium ferrite.

[0010] Optionally, the organic pigment includes at least one of a phthalocyanine pigment, an azo pigment, and an anthraquinone pigment.

[0011] Optionally, the mass ratio of the organic pigment to the modified ferrite in the modified magnetic pigment is 1:(5-10.

[0012] Optionally, the first functional auxiliary agent includes a dispersant, a curing agent, a thickener, a defoaming agent and a leveling agent.

[0013] Optionally, the first solvent includes at least one of an aliphatic hydrocarbon solvent, an ester solvent, and a ketone solvent.

[0014] Optionally, the mass ratio of the ferrite to the cashew nut shell oil is 1:(0.25-0.5).

[0015] Optionally, the ferrite is subjected to surface activation treatment in a silane solution, wherein the solute in the silane solution includes at least one of trimethylchlorosilane, dimethyldichlorosilane and methyltrichlorosilane.

[0016] Optionally, the preparation method of the modified magnetic pigment comprises: preheating and activating the modified ferrite at 45-55° C., stirring and mixing the modified ferrite with the organic pigment, and separating and drying the modified magnetic pigment.

[0017] Optionally, the acrylic magnetic ink comprises, by mass, 20-30 parts of acrylate prepolymer, 5-10 parts of modified magnetic powder, 1-3 parts of photoinitiator, 1-5 parts of second functional auxiliary agent and 10-20 parts of second solvent.

[0018] Optionally, the preparation method of the modified magnetic powder includes: modifying the surface hydroxyl groups of the magnetic powder in an alkaline solution, mixing with a phthalic anhydride solution, separating and drying to obtain a modified powder; surface activating an inorganic pigment in a silane coupling agent, ultrasonically mixing with the modified powder, separating and drying, and magnetizing to obtain a modified magnetic powder.

[0019] Optionally, the acrylate prepolymer includes at least one of epoxy acrylate, polyurethane acrylate, polyether acrylate, and silicone acrylate.

[0020] Optionally, the photoinitiator includes photoinitiator 907 , photoinitiator 184 , and photoinitiator 819 .

[0021] Optionally, the second functional auxiliary agent includes a leveling agent, an antioxidant and a defoaming agent.

[0022] Optionally, the second solvent includes one of a hydrocarbon solvent and an ester solvent.

[0023] Optionally, the magnetic powder includes cobalt ferrite.

[0024] Optionally, when the surface hydroxyl groups of the magnetic powder are modified in an alkaline solution, the alkaline solution includes one of a sodium hydroxide solution and a potassium hydroxide solution.

[0025] Optionally, the mass ratio of the magnetic powder to the phthalic anhydride in the phthalic anhydride solution is 1:(0.15-0.20).

[0026] Optionally, the mass ratio of the modified powder to the inorganic pigment is 1:(1-1.5).

[0027] Optionally, the average particle size of the modified magnetic powder is 50-100 nm.

[0028] Optionally, the polyester magnetic ink is baked and cured at 150-200° C. in a first magnetic field environment of 500-800 mT.

[0029] Optionally, the acrylic magnetic ink is light-cured in a second magnetic field environment of 500-800 mT.

[0030] In a second aspect, the present invention further provides a decorative board having a double-layer suspension coating formed by any of the above-mentioned optional double-layer suspension coating forming processes on at least one surface of the decorative board. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with general skills in the field to which the present invention belongs.

[0032] The invention provides a double-layer suspension coating forming process, comprising: applying polyester magnetic ink to the surface of a plate to be printed by screen printing, baking and curing in a first magnetic field environment to obtain a first coating, then applying acrylic magnetic ink to the surface of the first coating by screen printing, drying and curing in a second magnetic field environment to obtain a double-layer suspension coating formed on the surface of the plate.

[0033] In fact, by using screen printing, printing can be performed on the surface of various materials, which can greatly improve the applicability of the molding process in the double-layer suspension coating molding. At the same time, screen printing can also achieve high-precision printing, low cost, simple operation and suitable for large-scale production. In addition, it breaks the barrier that the traditional electroplating process can only achieve a single-layer three-dimensional texture, shortening the path cycle of coating processing.

[0034] In fact, the polyester magnetic ink includes a polyester matrix, a modified magnetic pigment dispersed in the polyester matrix, and a first function. Specifically, the polyester matrix plays a role in solidification and film formation, and the modified magnetic pigment can move in the polyester matrix under the action of the first magnetic field environment through its own magnetism, thereby forming a first coating with a specific pattern after solidification.

[0035] Specifically, the polyester magnetic ink includes 30-40 parts of polyester matrix, 20-30 parts of modified magnetic pigment, 5-10 parts of first functional additive and 20-30 parts of first solvent by weight. In fact, the first functional additive can give the polyester magnetic ink comprehensive properties, and the first solvent can dilute the polyester magnetic ink, which is conducive to the uniform distribution and flow of the polyester magnetic ink on the surface of the plate during the screen printing process, and is also conducive to the movement of the modified magnetic pigment.

[0036] In some embodiments, the modified magnetic pigment includes an organic pigment and a modified ferrite compounded with the organic pigment. In fact, by compounding the modified ferrite with the organic pigment, it is advantageous to coat the organic pigment on the surface of the modified ferrite, thereby improving the compatibility of the modified ferrite in the polyester matrix, and the organic pigment can not only give the modified ferrite an appearance color, thereby forming different textures in the polyester ink film when the modified ferrite moves in a magnetic field environment, but also the organic pigment can improve the lubricity of the modified ferrite in the polyester ink, which is beneficial to the movement of the modified ferrite.

[0037] In some embodiments, the preparation method of the modified ferrite includes: stirring and mixing the ferrite with cashew nut shell oil after surface activation treatment, separating and drying, and then magnetizing to obtain the modified ferrite. In fact, by pre-surface activation of the ferrite, it is beneficial to increase the number of active sites on the surface of the ferrite, thereby improving the interaction effect with cashew nut shell oil, which is beneficial to improving the coating effect of cashew nut shell oil on the ferrite, and then the cashew nut shell oil molecules are combined with the ferrite through hydrogen bonds, which is beneficial to the loading of the ferrite on the organic pigment.

[0038] In some embodiments, the ferrite includes barium ferrite (BaFe 12 O 19 ), Strontium ferrite (SrFe 12 O 19). In fact, when barium ferrite and strontium ferrite are magnetized, the consistency of magnetic moment orientation can be improved, and the magnetic stability, anti-demagnetization ability and coercive force can be enhanced. Specifically, the average particle size of the ferrite used is 100-200nm, which is conducive to increasing the specific surface area of ​​the ferrite, thereby facilitating the coating of cashew nut shell oil on the surface of the ferrite. In addition, small-particle ferrite can be made into small-particle modified magnetic pigments, thereby improving the fineness of the formed patterns and textures.

[0039] In some embodiments, when the ferrite is subjected to surface activation treatment, the ferrite is pre-immersed in a silane solution and then separated and dried. In fact, by using a silane solution to surface activate the ferrite, the number of active groups on the ferrite surface can be effectively increased, and the grafting of silane groups on the ferrite surface can be beneficial to the coating and compounding of cashew nut shell oil. Specifically, the solute in the silane solution includes at least one of trimethylchlorosilane, dimethyldichlorosilane, and methyltrichlorosilane.

[0040] In some embodiments, when the ferrite is surface-modified and stirred and mixed with cashew nut shell liquid, the mass ratio of ferrite to cashew nut shell liquid is 1: (0.25-0.5). In fact, by adjusting the mass ratio of ferrite to cashew nut shell liquid, the coating performance of cashew nut shell liquid on ferrite can be adjusted. In fact, when stirring and mixing, the ferrite is dispersed in an acetone solution dissolved with cashew nut shell liquid, and ultrasonic dispersion and oscillation dispersion are performed to perform uniform mixing.

[0041] In some embodiments, when the surface-activated ferrite and cashew nut shell oil are stirred and mixed and then separated and dried, the separated solid is cyclically rinsed with anhydrous ethanol and deionized water, and the rinsed solid is dried to constant weight in an environment of 60-80°C, and then magnetized in a magnetic field environment of 1-2T to obtain modified ferrite.

[0042] Specifically, the preparation method of the modified magnetic pigment includes: preheating and activating the modified ferrite at 45-55°C, stirring and mixing with the organic pigment, and separating and drying to obtain the modified magnetic pigment. In fact, preheating the modified ferrite is conducive to activating the cashew shell oil molecules on the surface of the modified ferrite, thereby improving the composite efficiency of the modified ferrite and the organic pigment, so that the organic pigment is evenly coated on the surface of the modified ferrite. In fact, the mass ratio of the organic pigment to the modified ferrite is 1: (5-10), and the organic pigment includes at least one of a phthalocyanine pigment, an azo pigment, and an anthraquinone pigment.

[0043] In some embodiments, the first functional additive in the polyester magnetic ink includes a dispersant, a curing agent, a thickener, a defoaming agent and a leveling agent, and the first solvent includes at least one of an aliphatic hydrocarbon solvent, an ester solvent and a ketone solvent. In fact, different dispersants in the polyester magnetic ink can give the magnetic ink different properties. For example, the dispersant can improve the dispersibility of the modified magnetic pigment in the ink to avoid sedimentation, while the curing agent can promote the curing of the polyester magnetic ink to form a film.

[0044] Specifically, the acrylic magnetic ink includes, by mass, 20-30 parts of acrylate prepolymer, 5-10 parts of modified magnetic powder, 1-3 parts of photoinitiator, 1-5 parts of second functional additive and 10-20 parts of second solvent. In fact, the photoinitiator in the acrylic magnetic ink can cure the acrylic magnetic ink under the action of light, thereby effectively improving the curing efficiency. At the same time, the formed acrylic film has good transparency and appearance, avoiding shielding of the first coating.

[0045] In some embodiments, the preparation method of the modified magnetic powder includes: modifying the surface hydroxyl group of the magnetic powder in an alkali solution, mixing with a phthalic anhydride solution, and separating and drying to obtain the modified powder; and ultrasonically mixing the inorganic pigment with the modified powder after surface activation in a silane coupling agent, separating and drying, and magnetizing to obtain the modified magnetic powder. In fact, by compounding the magnetic powder with phthalic anhydride, the dispersibility and lubricity of the magnetic powder in acrylic magnetic ink can be effectively improved, and after compounding with the inorganic pigment, the inorganic pigment moves in the acrylic ink in a magnetic field environment to form a composite texture.

[0046] In some embodiments, the acrylate prepolymer includes at least one of epoxy acrylate, polyurethane acrylate, polyether acrylate, and silicone acrylate; the photoinitiator includes photoinitiator 907, photoinitiator 184, and photoinitiator 819; the second functional auxiliary agent includes a leveling agent, an antioxidant, and a defoaming agent; the second solvent includes one of a hydrocarbon solvent and an ester solvent; and the magnetic powder includes cobalt ferrite (CoFe2O4).

[0047] In fact, when the surface hydroxyl groups of the magnetic powder are modified in an alkali solution, the alkali solution includes one of a sodium hydroxide solution and a potassium hydroxide solution. The mass ratio of the magnetic powder to the phthalic anhydride in the phthalic anhydride solution is 1:(0.15-0.20), and the mass ratio of the modified powder to the inorganic pigment is 1:(1-1.5), and the average particle size of the modified magnetic powder is 50-100 nm.

[0048] In some embodiments, the polyester magnetic ink is cured by baking at 70-100° C. in a first magnetic field environment of 500-800 mT. Meanwhile, the acrylic magnetic ink can be cured by light in a second magnetic field environment of 500-800 mT.

[0049] The present invention also provides a decorative sheet material, wherein at least one surface of the decorative sheet material has a double-layer suspension coating formed by the double-layer suspension coating forming process in any of the above-mentioned embodiments. In fact, the decorative sheet material provided by the present invention can be a PC composite sheet material, on the surface of which polyester magnetic ink is printed in a planar printing manner by screen printing, and texture forming and baking and curing are performed in the oriented magnetic field generated by the magnetic oriented mold to form a first coating layer with a planar visual three-dimensional effect, and then acrylic magnetic ink is covered on the surface of the first coating layer in a planar coating manner by a second screen printing, and then placed in the oriented magnetic field generated by the magnetic oriented mold for texture forming, and light curing is performed in a light environment to obtain a decorative sheet material.

[0050] Preparation Example 1 This preparation example 1 provides a method for preparing a modified magnetic pigment, comprising the following steps: S1. Barium ferrite with an average particle size of 100 nm was ultrasonically dispersed in an ether solution of trimethylsilyl chloride (CAS: 75-77-4; the mass ratio of barium ferrite to trimethylsilyl chloride was 1:0.1) at a frequency of 20 kHz for 15 minutes to activate the surface of the barium ferrite; S2. The surface activated barium ferrite and cashew nut shell oil were mixed in a mass ratio of 1:0.3, put into acetone, stirred and dissolved, and then ultrasonically dispersed at a frequency of 20 kHz. After being kept in a water bath at 35°C for 2 hours, the mixture was separated and rinsed three times with anhydrous ethanol and deionized water. The solid obtained by rinsing was dried in a vacuum drying oven at 80°C to constant weight, and then magnetized in a magnetic field environment of 1 T to obtain a modified ferrite. S3. Preheat the modified ferrite at 50° C. in a vacuum environment for 1 hour, then stir and mix with benzidine yellow G (CAS: 6358-85-6) at a mass ratio of 6:1, separate and dry to obtain a modified magnetic pigment.

[0051] Preparation Example 2 This preparation example 2 provides a method for preparing a modified magnetic pigment, comprising the following steps: S1. Barium ferrite with an average particle size of 100 nm was ultrasonically dispersed in an ether solution of trimethylsilyl chloride (CAS: 75-77-4; the mass ratio of barium ferrite to trimethylsilyl chloride was 1:0.1) at a frequency of 20 kHz for 15 minutes to activate the surface of the barium ferrite; S2. The surface activated barium ferrite is magnetized in a 1 T magnetic field environment, preheated in a 50° C. vacuum environment for 1 hour, and then mixed with benzidine yellow G (CAS: 6358-85-6) at a mass ratio of 6:1, separated and dried to obtain a modified magnetic pigment.

[0052] Preparation Example 3 This preparation example 3 provides a method for preparing a modified magnetic powder, comprising the following steps: Y1. Add cobalt ferrite with an average particle size of 50 nm into a saturated aqueous solution of sodium hydroxide at a solid-liquid ratio of 0.15 g / mL, disperse it ultrasonically at a frequency of 20 kHz for 15 minutes, separate it, rinse it with deionized water, and transfer it to a 50°C vacuum drying oven to dry it to constant weight to complete the surface hydroxyl modification of the cobalt ferrite; Y2. The cobalt ferrite with modified surface hydroxyl groups was ultrasonically mixed with an ethanol solution of phthalic anhydride (CAS: 85-44-9, the mass ratio of cobalt ferrite to phthalic anhydride was 1:0.15), and then kept warm in a 40°C water bath for 2 hours. The mixture was separated and rinsed with anhydrous ethanol, and then transferred to a 70°C vacuum drying oven and dried to constant weight to obtain a modified powder. Y3. Red iron oxide with an average particle size of 50 nm is ultrasonically dispersed in an ether solution of trimethylsilyl chloride (CAS: 75-77-4; the mass ratio of red iron oxide to trimethylsilyl chloride is 1:0.1), separated and dried to constant weight, and then ultrasonically dispersed with modified powder in deionized water at a mass ratio of 1:1, separated, dried and ground, and then magnetized in a 1 T magnetic field environment to obtain modified magnetic powder.

[0053] Preparation Example 4 This preparation example 4 provides a method for preparing a modified magnetic powder, comprising the following steps: Y1. Add cobalt ferrite with an average particle size of 50 nm into a saturated aqueous solution of sodium hydroxide at a solid-liquid ratio of 0.15 g / mL, disperse it ultrasonically at a frequency of 20 kHz for 15 minutes, separate it, rinse it with deionized water, and transfer it to a 50°C vacuum drying oven to dry it to constant weight to complete the surface hydroxyl modification of the cobalt ferrite; Y2. Red iron oxide with an average particle size of 50 nm is ultrasonically dispersed in an ether solution of trimethylsilyl chloride (CAS: 75-77-4; the mass ratio of red iron oxide to trimethylsilyl chloride is 1:0.1), separated and dried to constant weight, and then ultrasonically dispersed with cobalt ferrite modified with surface hydroxyl groups in deionized water in a mass ratio of 1:1, separated, dried and ground, and then magnetized in a 1 T magnetic field environment to obtain a modified magnetic powder.

[0054] Example 1 This embodiment 1 provides a polyester magnetic ink, which includes, by mass, 30 parts of polyethylene terephthalate (P875573 purchased from McLean Reagent), 20 parts of modified magnetic pigment prepared in Preparation Example 1, 1 part of BYK-101 (dispersant), 1 part of curing agent (Dow Corning DC4000), 1 part of polyamide wax (thickener, purchased from Tianjin Ruike Chemical Trading Co., Ltd.), 1 part of methyl silicone oil (defoaming agent, purchased from Jinan Silicon Port Chemical Co., Ltd.), 1 part of leveling agent (Mo Neng Chemical 1080) and 20 parts of petroleum ether.

[0055] Example 2 This embodiment 2 provides a polyester magnetic ink, which includes, by mass, 35 parts of polyethylene terephthalate (P875573 purchased from McLean Reagent), 25 parts of the modified magnetic pigment prepared in Preparation Example 1, 1.4 parts of BYK-101 (dispersant), 1.2 parts of curing agent (Dow Corning DC4000), 1.6 parts of polyamide wax (thickener, purchased from Tianjin Ruike Chemical Trading Co., Ltd.), 1.5 parts of methyl silicone oil (defoaming agent, purchased from Jinan Silicon Port Chemical Co., Ltd.), 1.8 parts of leveling agent (Mo Neng Chemical 1080) and 25 parts of petroleum ether.

[0056] Example 3 This embodiment 3 provides a polyester magnetic ink, which includes, by mass, 40 parts of polyethylene terephthalate (P875573 purchased from McLean Reagent), 30 parts of modified magnetic pigment prepared in Preparation Example 1, 2 parts of BYK-101 (dispersant), 2 parts of curing agent (Dow Corning DC4000), 2 parts of polyamide wax (thickener, purchased from Tianjin Ruike Chemical Trading Co., Ltd.), 2 parts of methyl silicone oil (defoaming agent, purchased from Jinan Silicon Port Chemical Co., Ltd.), 2 parts of leveling agent (Mo Neng Chemical 1080) and 30 parts of petroleum ether.

[0057] Example 4 This embodiment 4 provides a polyester modified ink, which includes, by mass, 35 parts of polyethylene terephthalate (P875573 purchased from McLean Reagent), 25 parts of modified magnetic pigment prepared in Preparation Example 2, 1.4 parts of BYK-101 (dispersant), 1.2 parts of curing agent (Dow Corning DC4000), 1.6 parts of polyamide wax (thickener, purchased from Tianjin Ruike Chemical Trading Co., Ltd.), 1.5 parts of methyl silicone oil (defoaming agent, purchased from Jinan Silicon Port Chemical Co., Ltd.), 1.8 parts of leveling agent (1080 from Mo Neng Chemical) and 25 parts of petroleum ether.

[0058] Example 5 This Example 5 provides an acrylic magnetic ink, which includes, by mass, 20 parts of epoxy acrylate (purchased from Hubei Xingyan New Material Technology Co., Ltd.), 5 parts of modified magnetic powder prepared in Preparation Example 3, 1 part of photoinitiator 184, 0.5 parts of leveling agent (Mo Neng Chemical 1080), 0.3 parts of antioxidant 1520, 0.2 parts of defoaming agent BYK-028, and 10 parts of n-hexane.

[0059] Example 6 This Example 6 provides an acrylic magnetic ink, which includes, by mass, 25 parts of epoxy acrylate (purchased from Hubei Xingyan New Material Technology Co., Ltd.), 8 parts of modified magnetic powder prepared in Preparation Example 3, 3 parts of photoinitiator 184, 2 parts of leveling agent (Mo Neng Chemical 1080), 1 part of antioxidant 1520, 1 part of defoaming agent BYK-028, and 15 parts of n-hexane.

[0060] Example 7 This Example 7 provides an acrylic magnetic ink, which includes, by mass, 30 parts of epoxy acrylate (purchased from Hubei Xingyan New Material Technology Co., Ltd.), 10 parts of modified magnetic powder prepared in Preparation Example 3, 5 parts of photoinitiator 184, 3 parts of leveling agent (Mo Neng Chemical 1080), 1 part of antioxidant 1520, 1 part of defoaming agent BYK-028, and 20 parts of n-hexane.

[0061] Example 8 This Example 8 provides an acrylic magnetic ink, which includes, by mass, 25 parts of epoxy acrylate (purchased from Hubei Xingyan New Material Technology Co., Ltd.), 8 parts of modified magnetic powder prepared in Preparation Example 4, 3 parts of photoinitiator 184, 2 parts of leveling agent (Mo Neng Chemical 1080), 1 part of antioxidant 1520, 1 part of defoaming agent BYK-028, and 15 parts of n-hexane.

[0062] Application Example 1 to Application Example 6 Application Examples 1 to 6 of the present invention respectively provide a double-layer suspended coating forming process, comprising the following steps: using an 80T silk screen printing screen to brush polyester magnetic ink on the surface of a transparent PC composite board, baking it at 80°C for 50 minutes in a first magnetic field environment of 600mT to form a first coating, and then using a silk screen printing screen to print acrylic magnetic ink on the surface of the first coating, and then placing a 365nm wavelength LED light source 30cm above the coating in a second magnetic field environment of 600mT for light curing to obtain a decorative board with a double-layer suspended coating.

[0063] The difference between Application Examples 1 to 6 is that the polyester magnetic ink and the acrylic magnetic ink used in the process are different, as shown in Table 1 below.

[0064] Table 1 Polyester magnetic ink and acrylic magnetic ink in Application Examples 1 to 6

[0065] Performance Testing Observe whether the double-layer suspension coating on the surface of the decorative board in Application Examples 1 to 6 is clearly visible, and test the adhesion fastness of the coating based on the method described in GB / T 13217-2009 "Test method for adhesion fastness of liquid inks". 3M tape is used as the test tape, and the percentage of the coating peeled off on the surface in the test area is used as the basis as shown in Table 2 below.

[0066] Table 2 Performance test of application examples 1 to 6

[0067] As can be seen from Table 2, the modified magnetic pigments used in Application Examples 1 to 3 are compounded with barium ferrite and cashew nut shell oil, and then compounded with benzidine yellow G, which can effectively improve the bonding strength between barium ferrite and benzidine yellow G, so that when curing and molding in a magnetic field environment, a coating structure with clear interface and texture can be formed in the first coating. However, the modified magnetic pigments used in Application Example 5 do not use cashew nut shell oil, but directly compound barium ferrite with benzidine yellow G, which causes the interface bonding force between barium ferrite and benzidine yellow G to decrease, resulting in the separation of benzidine yellow G from the surface of barium ferrite during the movement of the modified magnetic pigment, resulting in blurred texture, that is, the inner coating is relatively blurred. In addition, the modified magnetic powders used in Application Examples 1 to 3 are compounded with cobalt ferrite and phthalic anhydride, and then compounded with red iron oxide, which can effectively improve the bonding strength between red iron oxide and phthalic anhydride, thereby improving the visual effect of the coating.

[0068] It can also be seen from Figure 2 that the modified magnetic pigments compounded by barium ferrite and cashew nut shell oil and the modified magnetic powders compounded by cobalt ferrite and phthalic anhydride in Application Examples 1 to 3 can play the role of inorganic fillers in the coating, thereby improving the bonding strength between the coatings, thereby avoiding the coating from falling off during the drawing process.

[0069] Although the embodiments of the present invention are described in detail above, it is obvious to those skilled in the art that various modifications and variations can be made to these embodiments. However, it should be understood that such modifications and variations are within the scope and spirit of the present invention as described in the claims. Moreover, the present invention described herein may have other embodiments and may be implemented or realized in a variety of ways.

Claims

1. A double-layer suspension coating forming process, characterized in that: include: Polyester magnetic ink is brushed on the surface of a plate to be printed by screen printing, and after being baked and cured in a first magnetic field environment to obtain a first coating, acrylic magnetic ink is brushed on the surface of the first coating by screen printing, and after drying and curing in a second magnetic field environment, a double-layer suspension coating formed on the surface of the plate is obtained.

2. The double-layer suspension coating forming process according to claim 1 is characterized in that: The polyester magnetic ink comprises a polyester matrix, a modified magnetic pigment and a first functional additive dispersed in the polyester matrix; in parts by mass, the polyester magnetic ink comprises 30-40 parts of the polyester matrix, 20-30 parts of the modified magnetic pigment, 5-10 parts of the first functional additive and 20-30 parts of the first solvent.

3. The double-layer suspension coating forming process according to claim 2 is characterized in that: The modified magnetic pigment includes an organic pigment and a modified ferrite compounded with the organic pigment; The preparation method of the modified ferrite comprises: performing surface activation treatment on the ferrite, stirring and mixing the ferrite with cashew nut shell oil, separating and drying the ferrite, and then magnetizing the ferrite to obtain the modified ferrite.

4. The double-layer suspension coating forming process according to claim 3 is characterized in that: The ferrite includes at least one of barium ferrite and strontium ferrite; and / or, the organic pigment includes at least one of phthalocyanine pigment, azo pigment and anthraquinone pigment; and / or, the mass ratio of the organic pigment in the modified magnetic pigment to the modified ferrite is 1:(5-10); and / or, the first functional additive includes a dispersant, a curing agent, a thickener, a defoaming agent and a leveling agent; and / or, the first solvent includes at least one of aliphatic hydrocarbon solvents, ester solvents and ketone solvents; and / or, the mass ratio of the ferrite to the cashew nut shell oil is 1:(0.25-0.5); and / or, the ferrite is surface activated in a silane solution, and the solute in the silane solution includes at least one of trimethylchlorosilane, dimethyldichlorosilane and methyltrichlorosilane.

5. The double-layer suspension coating forming process according to claim 3 is characterized in that: The preparation method of the modified magnetic pigment comprises: preheating and activating the modified ferrite at 45-55° C., stirring and mixing the modified ferrite with the organic pigment, and separating and drying the modified magnetic pigment.

6. The double-layer suspension coating forming process according to claim 1 is characterized in that: The acrylic magnetic ink comprises, by weight, 20-30 parts of acrylate prepolymer, 5-10 parts of modified magnetic powder, 1-3 parts of photoinitiator, 1-5 parts of second functional auxiliary agent and 10-20 parts of second solvent; the preparation method of the modified magnetic powder comprises: modifying the surface hydroxyl group of the magnetic powder in an alkaline solution, mixing with a phthalic anhydride solution, separating and drying to obtain the modified powder; and activating the surface of an inorganic pigment in a silane coupling agent, ultrasonically mixing with the modified powder, separating and drying, and magnetizing to obtain the modified magnetic powder.

7. The double-layer suspension coating forming process according to claim 6 is characterized in that: The acrylate prepolymer includes at least one of epoxy acrylate, polyurethane acrylate, polyether acrylate, and silicone acrylate; and / or the photoinitiator includes photoinitiator 907, photoinitiator 184, and photoinitiator 819; and / or the second functional auxiliary agent includes a leveling agent, an antioxidant, and a defoaming agent; and / or the second solvent includes one of a hydrocarbon solvent and an ester solvent; and / or the magnetic powder includes cobalt ferrite.

8. The double-layer suspension coating forming process according to claim 6 is characterized in that: When the surface hydroxyl group of the magnetic powder is modified in an alkali solution, the alkali solution includes one of a sodium hydroxide solution and a potassium hydroxide solution; and / or, the mass ratio of the magnetic powder to the phthalic anhydride in the phthalic anhydride solution is 1:(0.15-0.20); and / or, the mass ratio of the modified powder to the inorganic pigment is 1:(1-1.5); and / or, the average particle size of the modified magnetic powder is 50-100 nm.

9. The double-layer suspension coating forming process according to claim 1, characterized in that: The polyester magnetic ink is baked and cured at 150-200° C. in a first magnetic field environment of 500-800 mT; and / or the acrylic magnetic ink is light-cured in a second magnetic field environment of 500-800 mT.

10. A decorative board, characterized in that: At least one surface of the decorative board has a double-layer suspension coating formed by the double-layer suspension coating forming process according to any one of claims 1 to 9.

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