Multifunctional coating based on acrylic resin and production process thereof

Abstract

The invention relates to the field of multifunctional coatings, in particular to a multifunctional coating based on acrylic resin and a production process of the multifunctional coating. Comprising the following raw materials in parts by weight: 40-60 parts of water-based acrylic resin emulsion, 0.3-0.6 part of a defoaming agent, 3-5 parts of modified nano hydroxyapatite, 0.3-0.5 part of a flatting agent, 2-5 parts of a dispersing agent, 1-3 parts of a curing agent, 3-5 parts of modified nano aluminum oxide and 30-50 parts of deionized water. The grafted chloroprene rubber can improve the interfacial compatibility of the nano-hydroxyapatite and a matrix and endows the coating with wear resistance, and after the nano-alumina is grafted with polybenzimidazole, a benzimidazole ring interacts with the matrix to enhance the interfacial compatibility of the nano-alumina and the matrix, so that the nano-alumina forms a high-temperature-resistant structure in the coating, and the wear resistance of the coating is improved. And the aromatic heterocyclic structure of the polybenzimidazole can endow the coating with higher thermal decomposition temperature, so that the coating has high temperature resistance.

Description

Technical Field

[0001] The present invention relates to the field of coatings, and in particular to a multifunctional coating based on acrylic resin and its production process Background Art

[0002] Acrylic polymer materials have long been widely used as surface coating materials in the fields of construction, automobiles, industrial protection, etc. due to their excellent film-forming properties, chemical corrosion resistance and adjustable mechanical properties. However, traditional acrylic-based materials still have significant defects in long-term outdoor exposure and mechanical friction scenarios: First, conventional acrylic coatings have insufficient wear resistance and are easily damaged by external scratches, affecting their appearance and functionality. Second, conventional acrylic coatings are more prone to thermal decomposition, yellowing, bubbles, etc. at higher temperatures, making the coating unable to be used for a long time.

[0003] Existing technologies address these issues by adjusting the coating formulation or adding a single inorganic nanomaterial to enhance the coating's wear resistance and high-temperature resistance. However, inorganic nanocoatings often fail to improve wear resistance and high-temperature resistance due to factors such as their own tendency to agglomerate. High filler content in inorganic nanomaterials also tends to disrupt film continuity, reducing flexibility and adhesion. Furthermore, inorganic fillers have poor interfacial compatibility with organic resins, making them susceptible to cracking in the coating at high temperatures due to stress concentration, limiting their potential to improve the coating's high-temperature resistance.

[0004] In view of the above problems, the present invention provides an acrylic resin coating, which can solve the problems existing in the prior art. Summary of the Invention

[0005] In order to solve the problems mentioned in the background technology, the purpose of the present invention is to provide a multifunctional coating based on acrylic resin and a production process thereof.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A multifunctional coating based on acrylic resin comprises the following raw materials, measured by weight: 40-60 parts of waterborne acrylic resin emulsion, 0.3-0.6 parts of defoaming agent, 3-5 parts of modified nano-hydroxyapatite, 0.3-0.5 parts of leveling agent, 2-5 parts of dispersant, 1-3 parts of curing agent, 3-5 parts of modified nano-alumina and 30-50 parts of deionized water.

[0008] Furthermore, the defoaming agent is tributyl phosphate or fatty alcohol polyoxyethylene ether.

[0009] Furthermore, the curing agent is aziridine; the leveling agent is water-based acrylate copolymer or polydimethylsiloxane; and the dispersant is polyvinyl pyrrolidone or polyacrylic acid sodium salt.

[0010] Furthermore, the preparation method of the modified nano-hydroxyapatite comprises the following steps:

[0011] Step A1: adding nano-hydroxyapatite to benzene, and then adding hydroquinone, p-toluenesulfonic acid, and methacrylic acid, stirring evenly and reacting at 70-80° C. for 5-8 hours, filtering, washing, and drying to obtain a modified nano-hydroxyapatite intermediate;

[0012] Step A2: Add chloroprene rubber to a toluene solution of benzoyl peroxide, then add the modified nano-hydroxyapatite intermediate, ultrasonicate for 10-30 minutes at 100-110° C., react for 3-5 hours, filter and wash, and vacuum dry for 10-12 hours to obtain the modified nano-hydroxyapatite.

[0013] In the above technical solution, methacrylic acid containing double bonds is used to undergo an esterification reaction with the hydroxyl groups on the surface of nanohydroxyapatite to produce nanohydroxyapatite with double bonds on the surface. Under the action of the initiator benzoyl peroxide, the rubber molecular chain of chloroprene rubber forms free radicals at the double bond position, and produces a free radical coupling reaction with the double bonds on the surface of the modified nanohydroxyapatite to produce modified nanohydroxyapatite.

[0014] Furthermore, in step A1, the mass ratio of the nano-hydroxyapatite to methacrylic acid is 1:2-3.

[0015] Furthermore, in step A2, the mass fraction of benzoyl peroxide in the toluene solution of benzoyl peroxide is 20-30%, the molecular weight of the chloroprene rubber is 4000, and the mass ratio of the chloroprene rubber to the modified nano-hydroxyapatite intermediate is 15-25:1.

[0016] Furthermore, the preparation method of the modified nano-alumina comprises the following steps:

[0017] Step B1: Mix a silane coupling agent with deionized water, heat to 60-80° C., stir with a magnetic stirrer until the silane coupling agent is completely hydrolyzed, and cool to room temperature to obtain a silane coupling agent solution;

[0018] Step B2: Dispersing the nano-alumina intermediate with anhydrous ethanol, then adding the silane coupling agent solution, mixing evenly, heating to 60-80°C, reacting for 6-8 hours, filtering, washing, and vacuum drying to obtain the modified nano-alumina intermediate;

[0019] Step B3: dissolve polybenzimidazole in dimethyl sulfoxide, mix well, add modified nano-alumina intermediate, potassium carbonate and ferric chloride, heat to 100-110°C, react for 12-24 hours, centrifuge the product, wash and vacuum dry it to obtain modified nano-alumina.

[0020] In the above technical solution, nano-alumina with rich surface hydroxyl groups is condensed with silanol groups generated by hydrolysis of a silane coupling agent to obtain a modified nano-alumina intermediate containing a halogen functional group, and the halogen functional group is reacted with polybenzimidazole by a catalyst to obtain a modified nano-alumina.

[0021] Furthermore, in step B1, the silane coupling agent is 3-chloropropyltriethoxysilane or 3-chloropropyltrimethoxysilane.

[0022] Furthermore, in step B3, the molecular weight of the polybenzimidazole is 27,000; and the mass ratio of the modified nano-alumina intermediate to the polybenzimidazole is 15-20:1.

[0023] A production process for a multifunctional coating based on acrylic resin comprises the following steps:

[0024] Step 1: Add modified nano-hydroxyapatite to water-based acrylic resin emulsion, then add leveling agent, dispersant, modified nano-alumina, and deionized water into a mixer, stir and mix evenly, then add defoamer and let stand to defoam to form a premix;

[0025] Step 2: Stir the curing agent and premix evenly to form a uniform coating at room temperature and store it.

[0026] Beneficial effects of the present invention:

[0027] (1) The present invention prepares nano-hydroxyapatite with a surface modified with chloroprene rubber as a functional additive for coatings. The chloroprene rubber can effectively improve the interfacial compatibility between the nano-hydroxyapatite and the acrylic resin and prevent the agglomeration of the nano-hydroxyapatite. The rigid nanoparticles of the nano-hydroxyapatite can effectively resist the wear of the coating surface. The chloroprene rubber can improve the wear resistance of the coating and prevent crack propagation through its own elastic structure, so that the coating has excellent wear resistance.

[0028] (2) The present invention produces nano-alumina with an aromatic heterocyclic structure on its surface as an additive for coatings. The aromatic heterocyclic structure of polybenzimidazole gives the coating a high thermal decomposition temperature. After grafting, a thermal barrier layer is formed on the coating surface through chemical bonding. At the same time, a transition structure is also formed between the acrylic resin and the nano-alumina, which effectively improves the agglomeration phenomenon of the nano-alumina and promotes its uniform dispersion in the coating. The uniformly dispersed nano-alumina can also give the coating excellent thermal stability.

[0029] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 1 is the infrared test image of the modified nano-hydroxyapatite intermediate and the modified nano-hydroxyapatite in Example 1;

[0032] Figure 2 These are infrared test images of the modified nano-alumina intermediate and modified nano-alumina in Example 1. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0034] Example 1:

[0035] A multifunctional coating based on acrylic resin comprises the following raw materials, measured by weight: 40 parts of waterborne acrylic resin emulsion, 0.6 parts of tributyl phosphate (a defoaming agent), 3 parts of modified nano-hydroxyapatite, 0.5 parts of polydimethylsiloxane (a leveling agent), 2 parts of polyvinyl pyrrolidone (a dispersant), 1 part of aziridine (a curing agent), 3 parts of modified nano-alumina, and 30 parts of deionized water.

[0036] The production process of the coating includes the following steps:

[0037] Step 1: Add modified nano-hydroxyapatite to water-based acrylic resin emulsion, then add leveling agent polydimethylsiloxane, dispersant polyvinyl pyrrolidone, modified nano-alumina, and deionized water into a mixer, stir and mix evenly, then add defoaming agent tributyl phosphate and let it stand for defoaming to form a premix;

[0038] Step 2: Stir the curing agent aziridine and the premix evenly to form a uniform coating and store it at room temperature.

[0039] The modified nano-hydroxyapatite is produced by the following method:

[0040] Step A1: Add 0.5 g of nano-hydroxyapatite to 20 ml of benzene, then add 0.02 g of hydroquinone, 0.02 g of p-toluenesulfonic acid, and 1 ml of methacrylic acid, stir evenly, and react at 80° C. for 5 h. Filter, wash, and dry to obtain a modified nano-hydroxyapatite intermediate.

[0041] Step A2: 10 g of chloroprene rubber with a molecular weight of 4000 was added to 30 ml of a toluene solution with a mass fraction of 25% benzoyl peroxide, followed by the addition of 0.5 g of a modified nano-hydroxyapatite intermediate. The mixture was ultrasonicated at 110° C. for 10 min, reacted for 3 h, filtered and washed, and dried at 110° C. in a vacuum environment for 10 h to obtain modified nano-hydroxyapatite.

[0042] Schematic diagram of infrared test comparison of modified nano-hydroxyapatite intermediate and modified nano-hydroxyapatite Figure 1 As shown in the infrared test of modified nano-hydroxyapatite intermediate, 3457cm -1 The characteristic absorption peak of OH is at 2984-2813 cm -1 The characteristic absorption peaks of CH of methyl and ethyl are at 1737 cm -1 The C=O characteristic absorption peak of the ester group is 1278 cm -1 The CO characteristic absorption peak of the ester group is at 3423cm in the infrared test image of modified nano-hydroxyapatite. -1 The characteristic absorption peak of OH is at 2987-2804 cm -1 The characteristic absorption peaks of CH of methyl and ethyl are at 3025cm -1 The characteristic absorption peak of CH of alkenyl is at 680 cm -1 The C-Cl characteristic absorption peak is at .

[0043] The modified nano-alumina is produced by the following method:

[0044] Step B1: 1.2 g of 3-chloropropyltriethoxysilane (a silane coupling agent) was mixed with 50 ml of deionized water, the mixture was heated to 60° C., and stirred with a magnetic stirrer until the silane coupling agent was completely hydrolyzed. The mixture was then cooled to room temperature to obtain a silane coupling agent solution.

[0045] Step B2: Disperse 2 g of the nano-alumina intermediate with 30 ml of anhydrous ethanol, then add 4 ml of a silane coupling agent solution, mix well, heat to 60° C., react for 6 h, filter, wash, and vacuum dry to obtain a modified nano-alumina intermediate;

[0046] Step B3: Dissolve 15 g of polybenzimidazole with a molecular weight of 27,000 in 80 ml of dimethyl sulfoxide, mix well, add 0.6 g of modified nano-alumina intermediate, 0.03 g of potassium carbonate, and 0.05 g of ferric chloride, heat to 100°C in an oxygen-free environment, stir and react for 12 hours, cool, filter, wash, and vacuum dry to obtain modified nano-alumina.

[0047] Schematic diagram of infrared test comparison between modified nano-alumina intermediate and modified nano-alumina Figure 2 As shown in the infrared test diagram of modified nano-alumina intermediate, 3321cm -1 The characteristic absorption peak of OH is at 2812-2921cm -1 The characteristic absorption peaks of CH of methyl and ethyl are at 1074 cm -1 The Si-O-Al characteristic absorption peak is at 720 cm -1 The Si-C characteristic absorption peak is at 761 cm -1 The Al-O characteristic absorption peak is at 684 cm -1 The C-Cl characteristic absorption peak is at 3353cm in the infrared test diagram of modified nano-alumina. -1 The characteristic absorption peak of OH is at 2823-2942 cm -1 The characteristic absorption peaks of CH of methyl and ethyl are at 1669 cm -1 The characteristic absorption peak of C=N is 1482-1531cm -1 The characteristic absorption peak of the benzene ring skeleton is 1304 cm -1 The characteristic absorption peak of CN is 1054 cm -1 The Si-O-Al characteristic absorption peak is at 773 cm -1 The Al-O characteristic absorption peak is at 731 cm -1 The Si-C characteristic absorption peak is at 672 cm -1 The absorption peak at is C-Cl characteristic absorption peak, which is greatly weakened.

[0048] Example 2:

[0049] A multifunctional coating based on acrylic resin comprises the following raw materials, measured by weight: 45 parts of water-based acrylic resin emulsion, 0.5 parts of tributyl phosphate (a defoaming agent), 4.8 parts of modified nano-hydroxyapatite, 0.3 parts of polydimethylsiloxane (a leveling agent), 4 parts of polyvinyl pyrrolidone (a dispersant), 2 parts of aziridine (a curing agent), 4.5 parts of modified nano-alumina, and 40 parts of deionized water.

[0050] The production process of the coating includes the following steps:

[0051] Step 1: Add modified nano-hydroxyapatite to water-based acrylic resin emulsion, then add leveling agent polydimethylsiloxane, dispersant polyvinyl pyrrolidone, modified nano-alumina, and deionized water into a mixer, stir and mix evenly, then add defoaming agent tributyl phosphate and let it stand for defoaming to form a premix;

[0052] Step 2: Stir the curing agent aziridine and the premix evenly to form a uniform coating and store it at room temperature.

[0053] The preparation methods of the modified nano-hydroxyapatite and modified nano-alumina are the same as those in Example 1.

[0054] Example 3:

[0055] A multifunctional coating based on acrylic resin, characterized in that it comprises the following raw materials, in parts by weight: 60 parts of water-based acrylic resin emulsion, 0.6 parts of defoaming agent, 5 parts of modified nano-hydroxyapatite, 0.5 parts of leveling agent, 5 parts of dispersant, 3 parts of curing agent, 5 parts of modified nano-alumina, and 50 parts of deionized water.

[0056] The production process of the coating includes the following steps:

[0057] Step 1: Add modified nano-hydroxyapatite to water-based acrylic resin emulsion, then add leveling agent polydimethylsiloxane, dispersant polyvinyl pyrrolidone, modified nano-alumina, and deionized water into a mixer, stir and mix evenly, then add defoaming agent tributyl phosphate and let it stand for defoaming to form a premix;

[0058] Step 2: Stir the curing agent aziridine and the premix evenly to form a uniform coating and store it at room temperature.

[0059] The preparation methods of the modified nano-hydroxyapatite and modified nano-alumina are the same as those in Example 1.

[0060] Comparative Example 1:

[0061] A multifunctional coating based on acrylic resin, characterized in that it comprises the following raw materials, in parts by weight: 60 parts of water-based acrylic resin emulsion, 0.6 parts of defoaming agent, 5 parts of nano-hydroxyapatite, 0.5 parts of leveling agent, 5 parts of dispersant, 3 parts of curing agent, 5 parts of modified nano-alumina, and 50 parts of deionized water.

[0062] Step 1: Add nano-hydroxyapatite to water-based acrylic resin emulsion, then add leveling agent polydimethylsiloxane, dispersant polyvinyl pyrrolidone, modified nano-alumina, and deionized water into a mixer, stir and mix evenly, then add defoaming agent tributyl phosphate and let it stand for defoaming to form a premix;

[0063] Step 2: Stir the curing agent aziridine and the premix evenly to form a uniform coating and store it at room temperature.

[0064] The preparation method of the modified nano-alumina is the same as that in Example 1.

[0065] Comparative Example 2:

[0066] A multifunctional coating based on acrylic resin, characterized in that it comprises the following raw materials, in parts by weight: 60 parts of water-based acrylic resin emulsion, 0.6 parts of defoaming agent, 0.5 parts of leveling agent, 5 parts of dispersant, 3 parts of curing agent, 5 parts of modified nano-alumina, and 50 parts of deionized water.

[0067] The production process of the coating includes the following steps:

[0068] Step 1: Add the leveling agent polydimethylsiloxane to the water-based acrylic resin emulsion, then add the dispersant polyvinyl pyrrolidone, modified nano-alumina, and deionized water into a mixer, stir and mix evenly, then add the defoaming agent tributyl phosphate and let it stand for defoaming to form a premix;

[0069] Step 2: Stir the curing agent aziridine and the premix evenly to form a uniform coating and store it at room temperature.

[0070] The preparation method of the modified nano-alumina is the same as that in Example 1.

[0071] Comparative Example 3:

[0072] A multifunctional coating based on acrylic resin, characterized in that it comprises the following raw materials, in parts by weight: 60 parts of water-based acrylic resin emulsion, 0.6 parts of defoaming agent, 5 parts of modified nano-hydroxyapatite, 0.5 parts of leveling agent, 5 parts of dispersant, 5 parts of nano-alumina, 3 parts of curing agent, and 50 parts of deionized water.

[0073] The preparation method of the coating comprises the following steps:

[0074] Step 1: Add modified nano-hydroxyapatite to water-based acrylic resin emulsion, then add leveling agent polydimethylsiloxane, dispersant polyvinyl pyrrolidone, nano-alumina, and deionized water into a mixer, stir and mix evenly, then add defoaming agent tributyl phosphate and let stand to defoam to form a premix;

[0075] Step 2: Stir the curing agent aziridine and the premix evenly to form a uniform coating and store it at room temperature.

[0076] The preparation method of the modified nano-hydroxyapatite is the same as that in Example 1.

[0077] Comparative Example 4:

[0078] A multifunctional coating based on acrylic resin, characterized in that it comprises the following raw materials, in parts by weight: 60 parts of water-based acrylic resin emulsion, 0.6 parts of defoaming agent, 5 parts of modified nano-hydroxyapatite, 0.5 parts of leveling agent, 5 parts of dispersant, 3 parts of curing agent, and 50 parts of deionized water.

[0079] Step 1: Add modified nano-hydroxyapatite to water-based acrylic resin emulsion, then add leveling agent polydimethylsiloxane, dispersant polyvinyl pyrrolidone, and deionized water into a mixer, stir and mix evenly, then add defoaming agent tributyl phosphate and let stand to defoam to form a premix;

[0080] Step 2: Stir the curing agent aziridine and the premix evenly to form a uniform coating and store it at room temperature.

[0081] The preparation method of the modified nano-hydroxyapatite is the same as that in Example 1.

[0082] Comparative Example 5:

[0083] A multifunctional coating based on acrylic resin, characterized in that it comprises the following raw materials, in parts by weight: 60 parts of water-based acrylic resin emulsion, 0.6 parts of defoaming agent, 0.5 parts of leveling agent, 5 parts of dispersant, 3 parts of curing agent, and 50 parts of deionized water.

[0084] The preparation method of the coating comprises the following steps:

[0085] Step 1: Add the leveling agent polydimethylsiloxane to the water-based acrylic resin emulsion, then add the dispersant polyvinyl pyrrolidone and deionized water into a mixer, stir and mix evenly, then add the defoaming agent tributyl phosphate and let it stand to defoam to form a premix;

[0086] Step 2: Stir the curing agent aziridine and the premix evenly to form a uniform coating and store it at room temperature.

[0087] Performance testing:

[0088] The multifunctional coatings based on acrylic resin in Examples 1 to 3 of the present invention and Comparative Examples 1 to 5 were subjected to a wear resistance test: the coating wear resistance test was performed in accordance with GB / T1768-2006, using a rubber wheel at a rotation speed of (60±2) r / min; a high temperature resistance test was performed in accordance with standard GB1735-2009, placing the sample in a muffle furnace, heating it to 200° C., standing it for 10 hours, then taking it out and cooling it to room temperature. The surface condition of the sample was observed. If there was no paint film shedding or cracking, it indicated that the paint film had good heat resistance.

[0089] project Wear resistance (g) High temperature resistance Example 1 0.023 No cracking, no falling off Example 2 0.021 No cracking, no falling off Example 3 0.022 No cracking, no falling off Comparative Example 1 0.067 No cracking, no falling off Comparative Example 2 0.096 No cracking, no falling off Comparative Example 3 0.028 Cracks appear but not fall off Comparative Example 4 0.031 Cracking and peeling Comparative Example 5 0.112 Cracking and peeling

[0090] It can be concluded from the above table that the multifunctional coatings based on acrylic resin produced in Examples 1-3 have excellent wear resistance and do not crack or fall off after being in a high temperature environment for 10 hours, and have excellent high temperature resistance.

[0091] In the coating production process of Comparative Example 1, the nano-hydroxyapatite used was not modified, so the multifunctional coating based on acrylic resin produced had poor wear resistance but good high temperature resistance.

[0092] In the coating production process of Comparative Example 2, no nano-hydroxyapatite material was added, so the multifunctional coating based on acrylic resin produced had very poor wear resistance but good high temperature resistance.

[0093] In the coating production process of Comparative Example 3, the nano-alumina used was not modified, so the multifunctional coating based on acrylic resin produced in this example had excellent wear resistance but poor high temperature resistance.

[0094] In the coating production process of Comparative Example 4, nano boron carbide material was not used, so the acrylic-based multifunctional coating produced had excellent wear resistance, but poor high temperature resistance.

[0095] In the production process of Comparative Example 5, nano-hydroxyapatite and nano-alumina were not used, so the wear resistance and high temperature resistance were the worst.

[0096] The above content is merely an example and explanation of the concept of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A multifunctional coating based on acrylic resin, characterized in that, The raw materials include the following by weight: 40-60 parts of water-based acrylic resin emulsion, 0.3-0.6 parts of defoaming agent, 3-5 parts of modified nano-hydroxyapatite, 0.3-0.5 parts of leveling agent, 2-5 parts of dispersant, 1-3 parts of curing agent, 3-5 parts of modified nano-alumina and 30-50 parts of deionized water.

2. The multifunctional coating based on acrylic resin according to claim 1, characterized in that: The defoaming agent is tributyl phosphate or fatty alcohol polyoxyethylene ether.

3. The multifunctional coating based on acrylic resin according to claim 1, characterized in that: The curing agent is aziridine; the leveling agent is water-based acrylic ester copolymer or polydimethylsiloxane; and the dispersant is polyvinyl pyrrolidone or polyacrylic acid sodium salt.

4. The multifunctional coating based on acrylic resin according to claim 1, characterized in that: The preparation method of the modified nano-hydroxyapatite comprises the following steps: Step A1: adding nano-hydroxyapatite to benzene, then adding hydroquinone, p-toluenesulfonic acid, and methacrylic acid, stirring evenly, reacting at 70-80° C. for 5-8 hours, filtering, washing, and drying to obtain a modified nano-hydroxyapatite intermediate; Step A2: Add chloroprene rubber to a toluene solution of benzoyl peroxide, then add the modified nano-hydroxyapatite intermediate, ultrasonicate for 10-30 minutes at 100-110° C., react for 3-5 hours, filter and wash, and vacuum dry for 10-12 hours to obtain the modified nano-hydroxyapatite.

5. The multifunctional coating based on acrylic resin according to claim 4, characterized in that: In step A1, the mass ratio of the nano-hydroxyapatite to methacrylic acid is 1:2-3.

6. The multifunctional coating based on acrylic resin according to claim 4, characterized in that: In step A2, the mass fraction of benzoyl peroxide in the toluene solution of benzoyl peroxide is 20-30%, the molecular weight of the chloroprene rubber is 4000, and the mass ratio of the chloroprene rubber to the modified nano-hydroxyapatite intermediate is 15-25:

1.

7. The multifunctional coating based on acrylic resin according to claim 1, characterized in that: The preparation method of the modified nano-alumina comprises the following steps: Step B1: Mix a silane coupling agent with deionized water, heat to 60-80° C., stir with a magnetic stirrer until the silane coupling agent is completely hydrolyzed, and cool to room temperature to obtain a silane coupling agent solution; Step B2: Dispersing the nano-alumina intermediate with anhydrous ethanol, then adding the silane coupling agent solution, mixing evenly, heating to 60-80°C, reacting for 6-8 hours, filtering, washing, and vacuum drying to obtain the modified nano-alumina intermediate; Step B3: dissolve polybenzimidazole in dimethyl sulfoxide, mix well, add modified nano-alumina intermediate, potassium carbonate and ferric chloride, heat to 100-110°C, react for 12-24 hours, centrifuge the product, wash and vacuum dry it to obtain modified nano-alumina.

8. The multifunctional coating based on acrylic resin according to claim 7, characterized in that: In step B1, the silane coupling agent is 3-chloropropyltriethoxysilane or 3-chloropropyltrimethoxysilane.

9. The multifunctional coating based on acrylic resin according to claim 7, characterized in that: In step B3, the molecular weight of the polybenzimidazole is 27,000; and the mass ratio of the modified nano-alumina intermediate to the polybenzimidazole is 15-20:

1.

10. The process for producing a multifunctional coating based on acrylic resin according to claim 1, wherein: The following steps are involved: Step 1: Add modified nano-hydroxyapatite to water-based acrylic resin emulsion, then add leveling agent, dispersant, modified nano-alumina, and deionized water into a mixer, stir and mix evenly, then add defoamer and let stand to defoam to form a premix; Step 2: Stir the curing agent and premix evenly to form a uniform coating and store it at room temperature.

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