Powder coating capable of forming texture through magnetic control and texture forming method

Abstract

The invention relates to the technical field of functional powder coatings, and particularly discloses a powder coating capable of forming textures through magnetic control and a texture forming method. A powder coating capable of forming textures through magnetic control is prepared from base powder and magnetic pigment according to the mass ratio of (60-99): (1-40), and the base powder is prepared from, by weight, 50-80 parts of powder resin, 5-10 parts of filler, 0.5-10 parts of hyperchromic pigment and 6.5-13 parts of auxiliaries. Through the magnetic field gradient design of the magnetic mold, the three-dimensional texture is formed by directionally arranging the magnetic pigment powder along the magnetic field direction under the action of the external magnetic field by utilizing the directionally-arranged matrix of the magnetic pigment, the texture pattern can be programmed and regulated, the customization flexibility is higher, the texture formed under the same mold has high consistency, and the quality of the texture is improved. The consistency of texture coatings of multiple batches of products can be realized, and the formed texture coatings have excellent mechanical properties.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of functional powder coating, more particularly, it relates to a powder coating capable of forming texture under magnetic control and a texture forming method. BACKGROUND

[0002] With the upgrading of the demand of manufacturing industry for product appearance differentiation and function integration, powder coating has developed from the traditional protection type to the integration of protection and decoration.

[0003] Texture effect powder coating is a coating material capable of forming a non-flat coating with specific tactile and visual texture on the surface of a substrate. Through precise formula design and construction process control, on the one hand, it can achieve a variety of textures such as orange peel, sand texture, hammer texture, wrinkle, and skin texture from fine particles to three-dimensional lines to meet the aesthetic needs of different scenes, such as anti-slip and fingerprint-free sand texture of household appliances, and wood grain / stone grain texture of building materials. On the other hand, it can also achieve additional functions through texture structure, such as hiding substrate surface defects, improving slip resistance, enhancing wear resistance and chemical corrosion resistance, while inheriting the environmental protection and durability advantages of powder coating such as "zero VOC emission, high adhesion after curing, wear resistance, and chemical corrosion resistance", which meets the global low-carbon development trend of the coating industry, and is widely used in industrial equipment, household appliances, building materials, and daily necessities.

[0004] Currently, the industry mainly relies on passive regulation of powder coating formula combined with experience-based construction parameters to achieve texture effect. By adding special texture agents (such as microspheres and insoluble particles) or adjusting the proportion of resin and curing agent in the powder, the coating produces uneven shrinkage or particle suspension during heating and curing, forming natural texture. The depth and density of the texture are further refined by adjusting the spraying thickness, curing temperature, and time. The essence is to induce the coating to form texture through non-precise physical / chemical action.

[0005] For the related technologies in the above, the inventors found that as the downstream industry's requirements for texture consistency, customization flexibility, and three-dimensional expressiveness continue to improve, such as high-end household appliances requiring texture error ≤5% for products of the same batch, and building materials requiring natural gradient effect of simulated stone texture, the existing texture powder coating is poor in controllability and consistency of texture formation. The texture effects that can be achieved by existing technologies are mostly globally uniform, random lines without specific patterns, which are difficult to achieve preset, regular, and dynamic changing patterns on the surface of the coating. SUMMARY

[0006] In order to improve the precision and customization flexibility of powder coating in forming texture effect, the present application provides a powder coating capable of forming texture under magnetic control and a texture forming method.

[0007] In a first aspect, the application provides a powder coating capable of forming a magnetic texture, which comprises a base powder and a magnetic pigment in a mass ratio of (60-80):(20-40), wherein the magnetic pigment is a flaky powder coated with metal oxide, and the base powder comprises 50-80 parts of powder resin, 5-10 parts of filler, 0.5-10 parts of toning pigment, and 6.5-13 parts of auxiliary agent.

[0008] Optionally, the average particle size of the magnetic pigment is 5-20 μm, and the aspect ratio is ≥10:1.

[0009] By using the above technical solution, the magnetic material is mixed with the base powder of the pigment powder to form a composition to build a magnetic texture basic system, the magnetic pigment ensures the sensitivity of the magnetic field response, and a clear and stable texture has been formed, the base powder provides a film-forming basis to ensure the mechanical properties and construction performance of the texture coating, and the problem of mismatch between the formula components and the magnetic control demand in the traditional texture coating is solved.

[0010] The magnetic pigment powder with an aspect ratio ≥10:1 flaky structure can effectively improve the directional arrangement efficiency of the magnetic pigment in the magnetic field, improve the three-dimensional height of the formed texture, and help form a clear and glossy three-dimensional texture structure.

[0011] Optionally, the magnetic pigment is a modified magnetic pigment obtained by coating and modifying hydroxyl pillar[5]arene and ionic liquid.

[0012] Optionally, the ionic liquid is an imidazole phosphate ionic liquid.

[0013] Optionally, the ionic liquid is selected from 1-butyl-3-methylimidazole dibutyl phosphate ionic liquid.

[0014] Optionally, the preparation method of the modified magnetic pigment comprises the following steps: The hydroxyl pillar[5]arene and the ionic liquid are dissolved in ethanol, and the solution is ultrasonically treated to form a clathrate solution; The magnetic pigment is immersed in the clathrate solution, stirred at 40-50°C in a water bath for 8-10 h, and ultrasonically dispersed at intervals during the stirring, and then dried and sieved to obtain the modified magnetic pigment.

[0015] By using the above technical solution, the hydroxyl pillar[5]arene, as a macromolecular compound, has a large rigid structure, can coat the active sites of the metal oxide exposed on the surface of the magnetic pigment through hydrophobic interaction to form a physical barrier, and the hydroxyl groups in the molecular structure of the hydroxyl pillar[5]arene can form hydrogen bonds with the hydroxyl groups in the coating layer on the surface of the metal oxide through interaction to realize chemical anchoring and prevent the surface of the pillar arene from falling off.

[0016] The imidazole phosphate ionic liquid has a high melting point and good thermal stability, can be kept stable in a high-temperature molten state, the imidazole cation in the structure thereof can form a hydrogen bond to bridge the pillararene and be occluded and fixed, and the phosphate anion can be coordinated and chelated with metal ions on the surface of the magnetic pigment, so as to be stably anchored on the surface of the magnetic pigment together with the pillararene.

[0017] The rigid cyclic structure of the hydroxyl pillar[5]arene can form a nano protrusion on the flaky pigment, and the adjacent pigment particles can avoid direct contact and agglomeration due to steric hindrance repulsion, further, the coating of the imidazole phosphate ionic liquid makes the adjacent flaky pigments repel each other due to electrostatic repulsion, further reducing the agglomeration between the flaky structure magnetic pigments, and the magnetic pigment powder has stronger dispersion uniformity, and the ionic liquid further optimizes the interface polarity, so that the modified magnetic pigment has better compatibility with the resin, and the magnetic field response performance of the modified magnetic pigment particles is better, and precise texture orientation can be realized even under an ultra-low magnetic field strength.

[0018] Further, the composite modification of the hydroxyl pillar[5]arene and the ionic liquid significantly improves the mechanical properties of the formed texture, when the texture coating is impacted, the stress is transmitted from the resin to the dispersed rigid magnetic pigment particles, the existence of the coating layer plays a role in relaxing the interface stress, ensuring that the stress can be effectively dispersed and absorbed, and the impact resistance and flexibility of the texture coating are significantly improved.

[0019] Optionally, the raw material of the powder resin comprises a linear polyester resin and a hydroxyl-terminated hyperbranched polyester.

[0020] By adopting the above technical solution, the inventors add the hyperbranched polyester in the resin system, the linear polyester resin provides a rigid main chain to ensure the hardness of the texture coating, the hydroxyl-terminated hyperbranched polyester has a three-dimensional spherical structure, which on one hand effectively reduces the melt viscosity of the resin system during curing, reduces the obstacle of the directional arrangement of the magnetic pigment, the magnetic field response rate is faster, the fineness and formation speed of the texture are improved, and on the other hand forms a more compact microstructure with the flaky magnetic pigment, and the compactness, hardness and hiding power of the entire coating system on the substrate are improved.

[0021] In a second aspect, the application provides a preparation method of a powder coating capable of forming a texture under the control of a magnetic field, which adopts the following technical solution: The preparation method of the powder coating capable of forming a texture under the control of a magnetic field comprises the following steps: S1: the base powder raw material is weighed according to the weight parts, mixed uniformly, and then melt-extruded at 90-120℃, tabletted, ground and sieved to obtain the base powder, and the base powder is mixed with the magnetic pigment to obtain the powder coating; S2: embedding NdFeB permanent magnet array on the surface of the mold to obtain a magnetic mold, spraying the powder coating to the substrate and then moving into the magnetic mold, applying a static magnetic field to obtain a pre-prepared workpiece; S3: heating the pre-prepared workpiece to 180-200 DEG C, curing and cooling, and removing the magnetic mold to obtain a three-dimensional texture.

[0022] Optionally, the magnetic pole spacing in the magnetic mold is 5-10 mm, and the magnetic field distribution gradient difference is less than or equal to 10%.

[0023] Optionally, the strength of the static magnetic field applied in step S2 is 0.1-0.5T.

[0024] By adopting the above technical solution, NdFeB permanent magnet array is embedded on the surface of the mold, the magnetic pole compatibility and the magnetic field distribution are controlled, the sheet-shaped magnetic pigment coated with metal oxide is arranged in the direction of the magnetic field under the action of the external magnetic field in the powder melting stage, and a specific pattern is formed before curing. For example, the dense magnetic pole area can form fine patterns, and the sparse area can form rough textures. The problems of strong randomness and poor customization flexibility in traditional texture formation are solved. The formation of the texture is more flexible, the precision is higher and more stable, the consistency of the texture pattern of multiple batches can be realized, and the formed texture coating has excellent mechanical properties and is more durable and persistent.

[0025] In summary, the present application has the following beneficial effects: 1. By designing the magnetic field gradient of the magnetic mold, the present application utilizes the directional arrangement mechanism of the magnetic pigment, and the magnetic pigment powder is arranged in the direction of the magnetic field under the action of the external magnetic field to form a three-dimensional texture. The texture pattern can be programmed and controlled, the customization flexibility is higher, the textures formed under the same mold have high consistency, the consistency of the texture coating of multiple batches of products can be realized, and the formed texture coating has excellent mechanical properties.

[0026] 2. In the present application, the modified magnetic pigment obtained by coating modification of hydroxyl pillar[5]arene and imidazole phosphate ester ionic liquid is preferably used. The hydroxyl pillar[5]arene and imidazole phosphate ester ionic liquid are chemically anchored on the surface of the magnetic pigment. On the one hand, it significantly improves the dispersion stability of the sheet-shaped magnetic pigment, prevents overlapping and agglomeration between the sheet-shaped pigments, and significantly improves the magnetic field response flexibility of the magnetic pigment. The texture can be accurately formed under a very small magnetic field strength. It can also significantly improve the compatibility between the magnetic core pigment and the resin matrix, improve the interface compatibility, and the formed texture coating has more excellent mechanical properties.

[0027] 3、The application adopts a mixed resin system of linear polyester resin and hydroxyl-terminated hyperbranched polyester. The introduction of hyperbranched polyester improves the resin melting condition under curing condition, and the melting viscosity decreases, which is more suitable for the magnetic pigment system. The obstacle of the directional arrangement of the magnetic pigment in response to the magnetic field is reduced, the speed of texture formation is faster, the precision is higher, and the formed texture coating has more uniform gloss. DETAILED DESCRIPTION

[0028] The application will be further described in detail below in combination with examples and comparative examples.

[0029] Raw materials The raw materials used in the examples and comparative examples in the application are commercially available products, specifically: Hydroxyl linear polyurethane, selected from Dongguan Jiuru Plastic Raw Material Co., Ltd., AS737L, average particle size 5-20 μm, diameter-thickness ratio ≥ 10:1; Hydroxyl-terminated hyperbranched polyester, selected from Wuhan Hyperbranched Resin Technology Co., Ltd., H202; Magnetic pigment, selected from Hefei Xuyang Aluminum Pigment Co., Ltd., XY-M904; Hydroxyl pillar[5]arene, selected from Xi'an Ruixi Biological Technology Co., Ltd., CAS:1315103-53-7; 1-Butyl-3-methylimidazole dibutyl phosphate ionic liquid, CAS:663199-28-8; Curing agent is isocyanate curing agent, selected from Germany Covestro, Bayhydur 2655; Leveling agent, selected from Germany BYK, BYK381; Degassing agent, selected from Jinhuihong (Shenzhen) Industry Co., Ltd., JHH-602; Titanium dioxide, selected from Sichuan Longma, R-996, average particle size 0.26-0.3 μm. Examples

[0030] Example 1 A powder coating capable of forming texture under magnetic control, including 70:30 of base powder and modified magnetic pigment, according to parts by weight, the base powder includes 65 parts of hydroxyl linear polyurethane, 5 parts of barium sulfate and calcium carbonate powder with a mass ratio of 3:1, 6.6 parts of titanium dioxide, 7 parts of curing agent, 1.5 parts of leveling agent and 0.8 parts of degassing agent, wherein the modified magnetic pigment is obtained by coating modification of hydroxyl pillar[5]arene and 1-butyl-3-methylimidazole dibutyl phosphate ionic liquid; The preparation method of the modified magnetic pigment includes the following steps: S1: 2g of hydroxyl pillar[5]arene and 5g of 1-butyl-3-methylimidazolium dibutyl phosphate ionic liquid were added into 600mL of anhydrous ethanol, and a clathrate solution was formed by ultrasonic dispersion for 30min at 400W; S2: 100g of magnetic pigment was slowly added into the clathrate solution to ensure complete immersion, and stirred at 500rpm for 10h in a 40℃ water bath, during which ultrasonic dispersion was performed for 5min every 30min at 300W to promote the penetration and adsorption of the modifier onto the surface of the magnetic pigment, and then dried and sieved to obtain the modified magnetic pigment.

[0031] Example 2 A powder coating capable of forming texture under magnetic control, comprising a base powder and a modified magnetic pigment at a mass ratio of 60:40, wherein the base powder comprises 50 parts of hydroxyl linear polyurethane, 5 parts of barium sulfate and calcium carbonate powder at a mass ratio of 3:1, 10 parts of titanium dioxide, 5 parts of a curing agent, 1 part of a leveling agent, and 0.5 parts of a degassing agent, and the modified magnetic pigment is obtained by coating modification of hydroxyl pillar[5]arene and 1-butyl-3-methylimidazolium dibutyl phosphate ionic liquid; A method for preparing a modified magnetic pigment, comprising the following steps: S1: 2g of hydroxyl pillar[5]arene and 5g of 1-butyl-3-methylimidazolium dibutyl phosphate ionic liquid were added into 600mL of anhydrous ethanol, and a clathrate solution was formed by ultrasonic dispersion for 30min at 400W; S2: 100g of magnetic pigment was slowly added into the clathrate solution to ensure complete immersion, and stirred at 500rpm for 10h in a 40℃ water bath, during which ultrasonic dispersion was performed for 5min every 30min at 300W to promote the penetration and adsorption of the modifier onto the surface of the magnetic pigment, and then dried and sieved to obtain the modified magnetic pigment.

[0032] Example 3 A powder coating capable of forming texture under magnetic control, comprising a base powder and a modified magnetic pigment at a mass ratio of 80:20, wherein the base powder comprises 80 parts of hydroxyl linear polyurethane, 10 parts of barium sulfate and calcium carbonate powder at a mass ratio of 3:1, 0.5 parts of titanium dioxide, 10 parts of a curing agent, 2 parts of a leveling agent, and 1 part of a degassing agent, and the modified magnetic pigment is obtained by coating modification of hydroxyl pillar[5]arene and 1-butyl-3-methylimidazolium dibutyl phosphate ionic liquid; A method for preparing a modified magnetic pigment, comprising the following steps: S1: 2g of hydroxyl pillar[5]arene and 5g of 1-butyl-3-methylimidazolium dibutyl phosphate ionic liquid were added into 600mL of anhydrous ethanol, and a clathrate solution was formed by ultrasonic dispersion for 30min at 400W; S2: 100 g of magnetic pigment was slowly added into the inclusion compound solution to ensure complete immersion, and stirred at 45℃ water bath, 500 rpm for 9h, during which 300W ultrasonic dispersion was used for 5min every 30min to promote the penetration and adsorption of the modifier to the surface of the magnetic pigment, and then dried and sieved to obtain.

[0033] Example 4 A powder coating capable of forming texture under magnetic control, which is different from example 1 in that the preparation method of the modified magnetic pigment comprises the following steps: S1: 2g of hydroxyl pillar[5]arene was added into 600mL of anhydrous ethanol, and 400W ultrasonic dispersion was used for 30min to form a mixed solution; S2: 100g of magnetic pigment was slowly added into the mixed solution to ensure complete immersion, and stirred at 40℃ water bath, 500 rpm for 10h, during which 300W ultrasonic dispersion was used for 5min every 30min to promote the penetration and adsorption of the modifier to the surface of the magnetic pigment, and then dried and sieved to obtain, and other steps were the same as example 1.

[0034] Example 5 A powder coating capable of forming texture under magnetic control, which is different from example 1 in that the preparation method of the modified magnetic pigment comprises the following steps: S1: 5g of 1-butyl-3-methylimidazolium dibutyl phosphate ionic liquid was added into 600mL of anhydrous ethanol, and 400W ultrasonic dispersion was used for 30min to form a mixed solution; S2: 100g of magnetic pigment was slowly added into the mixed solution to ensure complete immersion, and stirred at 40℃ water bath, 500 rpm for 10h, during which 300W ultrasonic dispersion was used for 5min every 30min to promote the penetration and adsorption of the modifier to the surface of the magnetic pigment, and then dried and sieved to obtain, and other steps were the same as example 1.

[0035] Example 6 A powder coating capable of forming texture under magnetic control, which is different from example 1 in that the magnetic pigment is not modified, and other steps are the same as example 1.

[0036] Example 7 A powder coating capable of forming texture under magnetic control, which is different from example 1 in that the hydroxyl linear polyurethane in the base powder is replaced by equal mass of hydroxyl linear polyurethane and hydroxyl-terminated hyperbranched polyester with a mass ratio of 6:1, and other steps are the same as example 1.

[0037] Application Example A texture forming method, which uses the powder coating capable of forming texture under magnetic control of the application for construction.

[0038] Application Example 1 A method for forming a texture, the application of the magnetically controllable texture forming powder coating of embodiment 1 is used for construction, comprising the following steps: S1: the base powder raw material is weighed according to the weight part, then mixed in a high-speed mixer, after uniform mixing, the mixture is sent into an extruder for melting extrusion at 100 DEG C, then sent into a tablet press for tabletting, a coarse crusher for crushing, a fine grinder for grinding, and sieved to obtain a base powder with a particle size of 40+5 mu m; S2: a mold with a specific texture pattern is designed, and an array of NdFeB permanent magnets is embedded on the surface of the mold to obtain a magnetic mold; S3: the base powder is mixed with the modified magnetic pigment to obtain a powder coating, which is then added to a spraying device, the surface of the substrate is uniformly sprayed by electrostatic spraying, then the substrate sprayed with the powder coating is moved into the magnetic mold, a static magnetic field of 0.2T is applied to obtain a prefabricated workpiece, wherein the magnetic pole spacing in the magnetic mold is 5-10 mm, and the magnetic field gradient difference is less than or equal to 10%; S4: the prefabricated workpiece is heated to 180 DEG C together, the magnetic field is maintained, during which the flaky magnetic pigment is oriented and arranged along the magnetic field direction under the action of the magnetic field force, after solidification and cooling, the magnetic mold is removed to obtain a three-dimensional texture.

[0039] Application example 2 A method for forming a texture, the application of the magnetically controllable texture forming powder coating of embodiment 2 is used for construction, comprising the following steps: S1: the base powder raw material is weighed according to the weight part, then mixed in a high-speed mixer, after uniform mixing, the mixture is sent into an extruder for melting extrusion at 90 DEG C, then sent into a tablet press for tabletting, a coarse crusher for crushing, a fine grinder for grinding, and sieved to obtain a base powder with a particle size of 40+5 mu m; S2: a mold with a specific texture pattern is designed, and an array of NdFeB permanent magnets is embedded on the surface of the mold to obtain a magnetic mold; S3: the base powder is mixed with the modified magnetic pigment to obtain a powder coating, which is then added to a spraying device, the surface of the substrate is uniformly sprayed by electrostatic spraying, then the substrate sprayed with the powder coating is moved into the magnetic mold, a static magnetic field of 0.5T is applied to obtain a prefabricated workpiece, wherein the magnetic pole spacing in the magnetic mold is 5-10 mm, and the magnetic field gradient difference is less than or equal to 10%; S4: the prefabricated workpiece is heated to 200 DEG C together, the magnetic field is maintained, during which the flaky magnetic pigment is oriented and arranged along the magnetic field direction under the action of the magnetic field force, after solidification and cooling, the magnetic mold is removed to obtain a three-dimensional texture.

[0040] Application example 3 A method for forming a texture, the powder coating capable of forming a texture by magnetic control in application example 3 is used for construction, comprising the following steps: S1: the base powder raw material is weighed according to the weight part, then mixed in a high-speed mixer, after uniform mixing, the mixture is sent into an extruder for melt extrusion at 120 DEG C, then sent into a tablet press for tabletting, a coarse crusher for crushing, a fine grinder for grinding, and sieved to obtain a base powder with a particle size of 40+5 mu m; S2: a mold with a specific texture pattern is designed, and an array of NdFeB permanent magnets is embedded on the surface of the mold to obtain a magnetic mold; S3: the base powder is mixed with the modified magnetic pigment to obtain a powder coating, which is then added to a spraying device, and the surface of the substrate is uniformly sprayed by electrostatic spraying, then the substrate sprayed with the powder coating is moved into the magnetic mold, and a static magnetic field of 0.1 T is applied to obtain a prefabricated workpiece, wherein the magnetic pole spacing in the magnetic mold is 5-10 mm, and the magnetic field gradient difference is less than or equal to 10%; S4: the prefabricated workpiece is heated to 180 DEG C while the magnetic field is applied, during which the flaky magnetic pigment is oriented and arranged along the magnetic field direction under the action of the magnetic field force, and after solidification and cooling, the magnetic mold is removed to obtain a three-dimensional texture.

[0041] Application example 4 A method for forming a texture, which is different from application example 1 in that the powder coating capable of forming a texture by magnetic control in application example 4 is used for construction, and the other steps are the same as those in application example 1.

[0042] Application example 5 A method for forming a texture, which is different from application example 1 in that the powder coating capable of forming a texture by magnetic control in application example 5 is used for construction, and the other steps are the same as those in application example 1.

[0043] Application example 6 A method for forming a texture, which is different from application example 1 in that the powder coating capable of forming a texture by magnetic control in application example 6 is used for construction, and the other steps are the same as those in application example 1.

[0044] Application example 7 A method for forming a texture, which is different from application example 1 in that the powder coating capable of forming a texture by magnetic control in application example 7 is used for construction, and the other steps are the same as those in application example 1.

[0045] Performance detection test The texture coatings prepared in application examples 1-7 are subjected to the following related performance detection tests.

[0046] 1. Appearance: the texture coating obtained after curing is observed by visual observation, whether the formed pattern has a continuous and complete three-dimensional texture, and whether the gloss transition of the texture edge is continuous; 2. Flexibility: tested according to the method specified in GB / T 1731-1993, level 1: shaft stick 35 mm x 10 mm x (1 ± 0.1) mm, curvature radius (0.5 ± 0.1) mm; level 2: shaft stick 35 mm x 10 mm x (2 ± 0.1) mm, curvature radius (1 ± 0.1) mm; level 3: shaft stick 35 mm x 10 mm x (3 ± 0.1) mm, curvature radius (1.5 ± 0.1) mm, level 1 indicating the best flexibility, level 3 the worst; 3. Impact resistance: tested according to the method specified in GB / T 1732-1993; 4. Hardness: tested according to the pencil method specified in GB / T 6739-2007.

[0047] Table 1 According to the performance test results in Table 1, it can be seen that, by designing the magnetic field gradient of the magnetic mold, using the directional arrangement mechanism of the magnetic pigment, the magnetic pigment powder is arranged in the direction of the magnetic field under the action of the external magnetic field to form a three-dimensional texture, the texture pattern can be programmed and controlled, the customization flexibility is higher, and the texture coating formed by the application has excellent flexibility, impact resistance and anti-scratching and wear performance. The three-dimensional protrusions and interface complexity of the texture coating do not sacrifice the mechanical properties of the coating, leading to the problems of easy cracking, easy damage and easy scratching of the texture structure, and the texture coating has both decorative and durable properties.

[0048] According to the performance test results of Example 1 and Example 6, it can be seen that the modified magnetic pigment obtained by coating modification of hydroxyl column [5] arene and imidazole phosphate ionic liquid is more suitable for the coating of texture structure, significantly improves the interface compatibility of the magnetic pigment in the resin system, improves the surface physical properties of the texture coating, and at the same time improves the magnetic field response flexibility of the magnetic pigment, so that the flaky magnetic pigment can be arranged in the direction of the magnetic field more quickly and orderly to form a precise three-dimensional texture.

[0049] According to the performance detection results of embodiments 1 and 6, it can be seen that the modified magnetic pigment formed by the texture coating modified by the hydroxyl pillar[5]arene and the imidazole phosphate ionic liquid alone shows performance, and the effect of the hydroxyl pillar[5]arene alone is better than that of the ionic liquid alone. This is because the imidazole phosphate ionic liquid can realize the surface lubrication of the magnetic pigment, the imidazole cation in the structure of the imidazole phosphate ionic liquid can form a hydrogen bond with the pillar arene to realize bridging and then be included and fixed, the combination of the hydroxyl pillar[5]arene and the imidazole phosphate ionic liquid can form a solid anchoring layer on the surface of the pigment, and the physical barrier effect and electrostatic effect of the macrocyclic molecule significantly improve the problem of uneven dispersion and easy agglomeration of the magnetic pigment in the resin system, and the interfacial bonding force is significantly improved. Further, the rigid anchoring skeleton of the hydroxyl pillar[5]arene ensures the mechanical strength of the coating, when the texture coating is impacted, the stress is transmitted from the resin to the dispersed rigid magnetic pigment particles, the existence of the coating layer plays a role in relaxing the interfacial stress, and ensures that the stress can be effectively dispersed and absorbed, which significantly improves the impact resistance and flexibility of the texture coating.

[0050] According to the performance detection results of embodiments 1 and 6, it can be seen that the introduction of the hyperbranched polyester further improves the impact resistance of the texture coating, and the synergy of the hyperbranched polyester and the linear polyester, on the one hand, by reducing the melt viscosity, the magnetic pigment can realize high monodispersion, and the three-dimensional branched structure of the hyperbranched polyester can effectively disperse and buffer the impact on the coating, so that the stress transmission in the coating is more uniform, on the other hand, the obstacle of directional arrangement of the magnetic pigment is reduced, the magnetic field response rate is faster, and the fineness and formation speed of the texture are improved.

[0051] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A magnetically controllable texturing powder coating, characterized in that, The base powder includes 50-80 parts of powder resin, 5-10 parts of filler, 0.5-10 parts of toning pigment and 6.5-13 parts of auxiliary agent by weight parts, and the magnetic pigment is flaky powder coated with metal oxide.

2. The magnetically controllable textured powder paint according to claim 1, characterized in that, The magnetic pigment is a modified magnetic pigment coated with hydroxyl pillar[5]arene and ionic liquid.

3. The magnetically controllable textured powder coating according to claim 2, characterized in that, The ionic liquid is imidazole phosphate ionic liquid.

4. The magnetically controllable textured powder coating according to claim 3, characterized in that, The preparation method of the modified magnetic pigment comprises the following steps: The hydroxyl pillar[5]arene and ionic liquid are dissolved in ethanol and ultrasonic treatment to form a clathrate solution; The magnetic pigment is immersed in the clathrate solution, stirred at 40-50 DEG C water bath for 8-10 h, and ultrasonic dispersion treatment is carried out during the interval, and then dried and sieved to obtain the modified magnetic pigment.

5. The magnetically controllable textured powder coating of claim 1, wherein, The raw material of the powder resin includes linear polyester resin and hydroxyl-terminated hyperbranched polyester.

6. A texture forming method characterized by, The application of the magnetic controllable textured powder coating of any one of claims 1-5 comprises the following steps: S1: the base powder raw material is weighed according to weight parts, mixed uniformly, and then melt extruded at 90-120 DEG C, tabletted, ground and sieved to obtain the base powder, and the base powder is mixed with the magnetic pigment to obtain the powder coating; S2: the magnetic mold is obtained by embedding NdFeB permanent magnet array on the surface of the mold, the powder coating is sprayed on the substrate, and then moved into the magnetic mold, and a static magnetic field is applied to obtain a prefabricated workpiece; S3: the prefabricated workpiece is heated to 180-200 DEG C, solidified and cooled, and then the magnetic mold is removed to obtain a three-dimensional textured surface.

7. The texture forming method according to claim 6, wherein The magnetic pole spacing in the magnetic mold is 5-10 mm, and the magnetic field distribution gradient difference is less than or equal to 10%.

8. The texture forming method according to claim 6, wherein The strength of the static magnetic field applied in step S2 is 0.1-0.5 T.

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