Multifunctional acrylic resin-based coating and process for its production

Abstract

The present application relates to the field of multifunctional coating, in particular to a kind of multifunctional coating based on acrylic resin and its production process, the coating includes the following raw materials according to weight parts: water-based acrylic resin emulsion 40-60 parts, defoaming agent 0.3-0.6 parts, modified nano-hydroxyapatite 3-5 parts, leveling agent 0.3-0.5 parts, dispersing agent 2-5 parts, curing agent 1-3 parts, modified nano-aluminum oxide 3-5 parts, deionized water 30-50 parts, the rigid nano-particle of nano-hydroxyapatite can effectively resist the wear and tear of coating surface, grafted neoprene can improve the interface compatibility of nano-hydroxyapatite and matrix, give the wear resistance of coating, after nano-aluminum oxide grafts polybenzimidazole, benzimidazole ring and matrix interact, the interface compatibility of both is enhanced, makes nano-aluminum oxide form high-temperature resistant structure in coating, and the aromatic heterocyclic structure of polybenzimidazole can give coating higher thermal decomposition temperature so that coating has high-temperature resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of paint, in particular to a multifunctional paint based on acrylic resin and a production process thereof BACKGROUND

[0002] Acrylic polymer materials have been widely used as surface coating materials in the fields of building, automobile and industrial protection for a long time due to their excellent film-forming property, chemical corrosion resistance and controllable mechanical properties. However, the conventional acrylic-based materials still have significant defects in long-term outdoor exposure and mechanical friction scenarios: firstly, the wear resistance of conventional acrylic coatings is insufficient, and the surface is easily damaged by external force scratching, affecting the appearance and functionality; secondly, conventional acrylic coatings are prone to thermal decomposition, yellowing and bubbling at high temperatures, which makes the coating cannot be used for a long time.

[0003] For the above problems, the existing technology often adjusts the formula proportion of the paint or adds a single inorganic nano material to enhance the wear resistance and high temperature resistance of the coating. However, the inorganic nano paint often cannot improve the wear resistance and high temperature resistance of the paint due to its easy agglomeration and other reasons. The high filler content of inorganic nano materials often destroys the continuity of the coating film, reduces the flexibility and adhesion. At the same time, the interface compatibility between inorganic fillers and organic resins is poor, and the stress concentration at high temperature easily causes the coating to crack, which limits the improvement of the high temperature resistance of the paint.

[0004] In view of the above problems, the present application provides an acrylic resin paint which can solve the problems existing in the prior art. SUMMARY

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

[0006] The purpose of the present application can be achieved by the following technical solutions:

[0007] A multifunctional paint based on acrylic resin, by weight, comprising the following raw materials: 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 dispersing agent, 1-3 parts of curing agent, 3-5 parts of modified nano aluminum oxide and 30-50 parts of deionized water.

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

[0009] Further, the curing agent is aziridine, the leveling agent is water-based acrylic ester copolymer or polydimethylsiloxane, and the dispersing agent is polyvinylpyrrolidone or polyacrylic acid sodium salt.

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

[0011] Step A1: adding nano-hydroxyapatite into benzene, then adding hydroquinone, p-toluenesulfonic acid and methacrylic acid, stirring uniformly, and then reacting at 70-80℃ for 5-8h, to obtain the modified nano-hydroxyapatite intermediate after filtration, washing and drying;

[0012] Step A2: adding chlorobutyl rubber into the toluene solution of benzoyl peroxide, then adding the modified nano-hydroxyapatite intermediate, ultrasonicating at 100-110℃ for 10-30min, and then reacting for 3-5h, to obtain the modified nano-hydroxyapatite after filtration, washing and vacuum drying for 10-12h.

[0013] In the above technical solution, the esterification reaction of the methacrylic acid containing double bonds and the hydroxyl groups on the surface of the nano-hydroxyapatite is carried out to obtain the nano-hydroxyapatite containing double bonds on the surface, the rubber molecular chains of the chlorobutyl rubber form free radicals at the double bond positions under the action of the initiator benzoyl peroxide, and the free radical coupling reaction of the free radicals and the double bonds on the surface of the modified nano-hydroxyapatite is carried out to obtain the modified nano-hydroxyapatite.

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

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

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

[0017] Step B1: mixing the silane coupling agent with deionized water, heating to 60-80℃, and stirring with a magnetic stirrer until the silane coupling agent is completely hydrolyzed, and then cooling to room temperature to obtain the silane coupling agent solution;

[0018] Step B2: dispersing the nano-alumina oxide intermediate with anhydrous ethanol, then adding the silane coupling agent solution, uniformly mixing, heating to 60-80℃, and then reacting for 6-8h to obtain the modified nano-alumina oxide intermediate after filtration, washing and vacuum drying;

[0019] Step B3: dissolving polybenzimidazole in dimethyl sulfoxide, uniformly mixing, then adding the modified nano-alumina oxide intermediate, potassium carbonate and ferric chloride, heating to 100-110℃, and then reacting for 12-24h to obtain the modified nano-alumina oxide after centrifugation, washing and vacuum drying.

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

[0021] Further, in step B1, the silane coupling agent is 3-chloropropyl triethoxysilane or 3-chloropropyl trimethoxysilane.

[0022] Further, in step B3, the molecular weight of the polybenzimidazole is 27000; and the mass ratio of the modified nano-alumina intermediate to the polybenzimidazole is 15-20:1.

[0023] A production process of a multifunctional coating based on acrylic resin, comprising the following steps:

[0024] Step one: add the modified nano-hydroxyapatite into the aqueous acrylic resin emulsion, then add a leveling agent, a dispersing agent, modified nano-alumina and deionized water into a mixer, stir and mix uniformly, then add a defoaming agent, stand and defoam to form a premix;

[0025] Step two: stir and mix the curing agent with the premix uniformly to form a uniform coating, which can be stored at room temperature.

[0026] The beneficial effects of the present application are as follows:

[0027] (1) The present application uses nano-hydroxyapatite modified by chloroprene rubber as a functional additive of the coating, which can effectively improve the interfacial compatibility of the nano-hydroxyapatite and the acrylic resin, prevent the agglomeration of the nano-hydroxyapatite, and effectively resist the wear of the coating surface by the rigid nano-particles of the nano-hydroxyapatite.

[0028] (2) The present application uses nano-alumina containing aromatic heterocyclic structures on the surface as an additive of the coating, which can effectively improve the agglomeration of the nano-alumina and promote its uniform dispersion in the coating by the aromatic heterocyclic structure of the polybenzimidazole, and the uniformly dispersed nano-alumina can also endow the coating with excellent thermal stability.

[0029] Of course, it is not necessary for any product implementing the present application to achieve all the advantages mentioned above at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0031] Figure 1 The infrared test chart of the modified nanometer hydroxyapatite intermediate and the modified nanometer hydroxyapatite in Example 1;

[0032] Figure 2 The infrared test chart of the modified nanometer alumina intermediate and the modified nanometer alumina in Example 1. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort belong to the scope of protection of the present application.

[0034] Example 1:

[0035] A multifunctional coating based on acrylic resin, including the following raw materials by weight parts: water-based acrylic resin emulsion 40 parts, antifoaming agent tributyl phosphate 0.6 parts, modified nanometer hydroxyapatite 3 parts, leveling agent polydimethylsiloxane 0.5 parts, dispersing agent polyvinylpyrrolidone 2 parts, curing agent aziridine 1 part, modified nanometer alumina 3 parts, deionized water 30 parts.

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

[0037] Step one: add the modified nanometer hydroxyapatite into the water-based acrylic resin emulsion, then add the leveling agent polydimethylsiloxane, the dispersing agent polyvinylpyrrolidone, the modified nanometer alumina, and the deionized water into the mixer, stir and mix uniformly, then add the antifoaming agent tributyl phosphate to stand and defoam to form the premix;

[0038] Step two: stir and mix the curing agent aziridine and the premix uniformly to form the uniform coating, which can be stored at room temperature.

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

[0040] Step A1: Add 0.5g of nano-hydroxyapatite to 20ml of benzene, then add 0.02g of hydroquinone, 0.02g of p-toluenesulfonic acid, and 1ml of methacrylic acid. Stir well and react at 80℃ for 5h. After filtration, washing and drying, the modified nano-hydroxyapatite intermediate is obtained.

[0041] Step A2: Add 10g of chloroprene rubber with a molecular weight of 4000 to 30ml of toluene solution of benzoyl peroxide with a mass fraction of 25%, then add 0.5g of modified nano-hydroxyapatite intermediate, sonicate at 110℃ for 10min, react for 3h, filter and wash, and dry at 110℃ under vacuum for 10h to obtain modified nano-hydroxyapatite.

[0042] A comparative diagram of infrared spectral analysis of modified nano-hydroxyapatite intermediate and modified nano-hydroxyapatite is shown below. Figure 1 As shown in the infrared spectrum of the modified nano-hydroxyapatite intermediate, 3457 cm⁻¹ -1 The characteristic absorption peak for OH is located at 2984-2813 cm⁻¹. -1 The peak at 1737 cm⁻¹ is the characteristic absorption peak for CH of methyl and ethyl groups. -1 The peak at 1278 cm⁻¹ is the characteristic absorption peak of the C=O group of the ester group. -1 The characteristic absorption peak of CO at 3423 cm⁻¹ is observed in the infrared spectrum of modified nano-hydroxyapatite, where the ester group is located. -1 The characteristic absorption peak for OH is located at 2987-2804 cm⁻¹. -1 The peak at 3025 cm⁻¹ is the characteristic absorption peak of CH for methyl and ethyl groups. -1 The characteristic absorption peak of CH at 680 cm⁻¹ is for the alkenyl group. -1 The peak at this location is a characteristic absorption peak of C-Cl.

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

[0044] Step B1: Mix 1.2g of silane coupling agent 3-chloropropyltriethoxysilane with 50ml of deionized water, heat to 60℃, stir with a magnetic stirrer until the silane coupling agent is completely hydrolyzed, cool to room temperature, and obtain a silane coupling agent solution.

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

[0046] Step B3: 15g polybenzimidazole with molecular weight of 27000 was dissolved in 80ml dimethyl sulfoxide, after mixing, 0.6g modified nano-alumina intermediate and 0.03g potassium carbonate, 0.05g ferric chloride were added, and the reaction was stirred at 100℃ for 12h under anaerobic environment. After cooling, filtration and washing, and vacuum drying, the modified nano-alumina was obtained.

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

[0048] Example 2:

[0049] A multifunctional coating based on acrylic resin, including the following raw materials by weight: water-based acrylic resin emulsion 45 parts, antifoaming agent tributyl phosphate 0.5 parts, modified nano-hydroxyapatite 4.8 parts, leveling agent polydimethylsiloxane 0.3 parts, dispersing agent polyvinylpyrrolidone 4 parts, curing agent aziridine 2 parts, modified nano-alumina 4.5 parts, deionized water 40 parts.

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

[0051] Step one: add modified nano-hydroxyapatite into the aqueous acrylic resin emulsion, then add leveling agent polydimethylsiloxane, dispersing agent polyvinylpyrrolidone, modified nano-alumina, deionized water into the mixer, stir and mix uniformly, then add defoaming agent tributyl phosphate, stand for defoaming to form a premix;

[0052] Step two: stir and mix uniformly the curing agent aziridine with the premix to form a uniform paint, which can be stored at room temperature.

[0053] The preparation method of the modified nano-hydroxyapatite and the modified nano-alumina is the same as that of Example 1.

[0054] Example 3:

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

[0056] The production process of the paint comprises the following steps:

[0057] Step one: add modified nano-hydroxyapatite into the aqueous acrylic resin emulsion, then add leveling agent polydimethylsiloxane, dispersing agent polyvinylpyrrolidone, modified nano-alumina, deionized water into the mixer, stir and mix uniformly, then add defoaming agent tributyl phosphate, stand for defoaming to form a premix;

[0058] Step two: stir and mix uniformly the curing agent aziridine with the premix to form a uniform paint, which can be stored at room temperature.

[0059] The preparation method of the modified nano-hydroxyapatite and the modified nano-alumina is the same as that of Example 1.

[0060] Comparative Example 1:

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

[0062] Step one: add nano-hydroxyapatite into the aqueous acrylic resin emulsion, then add leveling agent polydimethylsiloxane, dispersing agent polyvinylpyrrolidone, modified nano-alumina, deionized water into the mixer, stir and mix uniformly, then add defoaming agent tributyl phosphate, stand for defoaming to form a premix;

[0063] Step two: mix the curing agent aziridine with the premix evenly, form a uniform coating, and store at room temperature.

[0064] The modified nano-aluminum oxide is prepared by the same method as in Example 1.

[0065] Comparative Example 2:

[0066] A multifunctional coating based on acrylic resin, characterized in that it comprises the following raw materials 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 dispersing agent, 3 parts of curing agent, 5 parts of modified nano-aluminum oxide, and 50 parts of deionized water.

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

[0068] Step one: add the leveling agent polydimethylsiloxane to the water-based acrylic resin emulsion, then add the dispersing agent polyvinyl pyrrolidone, the modified nano-aluminum oxide, and deionized water into the mixer, stir and mix evenly, then add the defoaming agent tributyl phosphate and stand for defoaming to form a premix;

[0069] Step two: mix the curing agent aziridine with the premix evenly, form a uniform coating, and store at room temperature.

[0070] The modified nano-aluminum oxide is prepared by the same method as in Example 1.

[0071] Comparative Example 3:

[0072] A multifunctional coating based on acrylic resin, characterized in that it comprises the following raw materials 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 dispersing agent, 5 parts of nano-aluminum oxide, 3 parts of curing agent, and 50 parts of deionized water.

[0073] The production process of the coating comprises the following steps:

[0074] Step one: add the modified nano-hydroxyapatite to the water-based acrylic resin emulsion, then add the leveling agent polydimethylsiloxane, the dispersing agent polyvinyl pyrrolidone, the nano-aluminum oxide, and deionized water into the mixer, stir and mix evenly, then add the defoaming agent tributyl phosphate and stand for defoaming to form a premix;

[0075] Step two: mix the curing agent aziridine with the premix evenly, form a uniform coating, and store at room temperature.

[0076] The modified nano-hydroxyapatite is prepared by the same method as in Example 1.

[0077] Comparative Example 4:

[0078] A multifunctional coating based on acrylic resin, characterized in that the following raw materials are included by weight parts: 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 dispersing agent, 3 parts of curing agent, and 50 parts of deionized water.

[0079] Step one: add modified nano-hydroxyapatite into water-based acrylic resin emulsion, then add leveling agent polydimethylsiloxane, dispersing agent polyvinylpyrrolidone, and deionized water into a mixer, stir and mix uniformly, then add defoaming agent tributyl phosphate, stand still to defoam and form a premix;

[0080] Step two: stir and mix the curing agent aziridine with the premix uniformly to form a uniform coating, which can be stored at room temperature.

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

[0082] Comparative Example 5:

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

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

[0085] Step one: add leveling agent polydimethylsiloxane into water-based acrylic resin emulsion, then add dispersing agent polyvinylpyrrolidone and deionized water into a mixer, stir and mix uniformly, then add defoaming agent tributyl phosphate, stand still to defoam and form a premix;

[0086] Step two: stir and mix the curing agent aziridine with the premix uniformly to form a uniform coating, which can be stored at room temperature.

[0087] Performance detection:

[0088] The multifunctional coatings based on acrylic resin in Embodiments 1-3 and Comparative Examples 1-5 are subjected to wear resistance test: the coating wear resistance test is carried out according to GB / T1768-2006, the rubber wheel is used in the wear resistance test, and the rotation speed is (60±2) r / min; the high temperature resistance test is carried out according to standard GB1735-2009, the sample plate is placed in a muffle furnace, heated to 200℃, taken out after 10h, and cooled to room temperature, and the sample plate surface is observed, if there is no paint film peeling or cracking, it indicates that the paint film has good heat resistance;

[0089] Item Wear resistance (g) High temperature resistance Example 1 0.023 No cracking, no peeling Example 2 0.021 No cracking, no peeling Example 3 0.022 No cracking, no peeling Comparative Example 1 0.067 No cracking, no peeling Comparative Example 2 0.096 No cracking, no peeling Comparative Example 3 0.028 Cracking occurred, no peeling Comparative Example 4 0.031 Cracking and peeling occurred Comparative Example 5 0.112 Cracking and peeling occurred

[0090] From the above table, it can be concluded that the acrylic resin-based multifunctional coating produced in Examples 1-3 has excellent wear resistance, and no cracking and peeling occurs after 10 hours of high temperature environment, and has excellent high temperature resistance.

[0091] In Comparative Example 1, the nano-hydroxyapatite used in the production of the coating is not modified, so the acrylic resin-based multifunctional coating produced has poor wear resistance and good high temperature resistance.

[0092] In Comparative Example 2, no nano-hydroxyapatite material is added during the production of the coating, so the acrylic resin-based multifunctional coating produced has very poor wear resistance and good high temperature resistance.

[0093] In Comparative Example 3, the nano-aluminum oxide used in the production of the coating is not modified, so the acrylic resin-based multifunctional coating produced has excellent wear resistance and poor high temperature resistance.

[0094] In Comparative Example 4, no nano-boron carbide material is used in the production of the coating, so the acrylic resin-based multifunctional coating produced has excellent wear resistance but very poor high temperature resistance.

[0095] In Comparative Example 5, no nano-hydroxyapatite and nano-aluminum oxide are used in the production process, so the wear resistance and high temperature resistance are the worst.

[0096] The above is only an example and explanation of the concept of the present application. Those skilled in the art can make various modifications or supplements to the described specific examples or use similar ways to replace them, as long as they do not deviate from the concept of the present application or exceed the scope defined by the present claims.

Claims

1. A multifunctional coating based on acrylic resin, characterized in that, By weight, it includes the following raw materials: 40-60 parts of water-based acrylic resin emulsion, 0.3-0.6 parts of defoamer, 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. The preparation method of the modified nano-hydroxyapatite includes the following steps: Step A1: Add nano-hydroxyapatite to benzene, then add hydroquinone, p-toluenesulfonic acid, and methacrylic acid. After stirring evenly, react at 70-80℃ for 5-8 hours. After filtration, washing, and drying, the modified nano-hydroxyapatite intermediate is obtained. Step A2: Add chloroprene rubber to a toluene solution of benzoyl peroxide, then add modified nano-hydroxyapatite intermediate, sonicate at 100-110℃ for 10-30 min, react for 3-5 h, filter and wash, and vacuum dry for 10-12 h to obtain modified nano-hydroxyapatite. The preparation method of the modified nano-alumina includes the following steps: Step B1: Mix the silane coupling agent with deionized water, heat to 60-80℃, stir with a magnetic stirrer until the silane coupling agent is completely hydrolyzed, cool to room temperature, and obtain a silane coupling agent solution; the silane coupling agent is 3-chloropropyltriethoxysilane or 3-chloropropyltrimethoxysilane. Step B2: Disperse the nano-alumina intermediate with anhydrous ethanol, then add silane coupling agent solution, mix well, heat to 60-80℃, react for 6-8 hours, filter, wash, and vacuum dry to obtain 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℃, react for 12-24h, centrifuge to get the product, wash and vacuum dry to obtain modified nano-alumina.

2. The multifunctional coating based on acrylic resin according to claim 1, characterized in that, The defoamer 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 an aqueous acrylate copolymer or polydimethylsiloxane; and the dispersant is polyvinylpyrrolidone or sodium polyacrylate.

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

5. A multifunctional coating based on acrylic resin according to claim 1, 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.

6. The multifunctional coating based on acrylic resin according to claim 1, characterized in that, In step B3, the molecular weight of the polybenzimidazole is 27,000; the mass ratio of the modified nano-alumina intermediate to the polybenzimidazole is 15-20:

1.

7. The production process of a multifunctional coating based on acrylic resin as described in claim 1, characterized in that, Includes the following steps: 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: Mix the curing agent and premixed material evenly to form a uniform coating, and store at room temperature.

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