Super-wear-resistant self-cleaning coating and preparation method therefor

Abstract

A super-wear-resistant self-cleaning coating, comprising first elastic finish coat and second self-cleaning finish coat. The first elastic finish coat comprises, by mass, 10-60 parts of a two-functionality-degree polyurethane acrylic resin A, 2-7 parts of an initiator A, 10-60 parts of an acrylate monomer A, and 3-40 parts of an additive A. The second self-cleaning finish coat comprises, by mass, 2-30 parts of an acrylic acid-modified organic silicon resin with inorganic powder affinity, 0.3-3 parts of high-hardness micro-powder particles, 2-20 parts of a two-functionality-degree polyurethane acrylic resin B, 10-40 parts of a multi-functionality-degree polyurethane acrylic resin B, 15-45 parts of an acrylate monomer B, 2-7 parts of an initiator B, and 3-40 parts of an additive B. Further disclosed is a preparation method for the super-wear-resistant self-cleaning coating.

Claims

1. A super wear-resistant self-cleaning coating, comprising a first elastic topcoat and a second self-cleaning topcoat, wherein the first elastic topcoat comprises, on the basis of parts by mass, 10-60 parts of a bifunctional polyurethane acrylic resin A, 2-7 parts of an initiator A, 10-60 parts of an acrylate monomer A, and 3-40 parts of an additive A; the second self-cleaning topcoat comprises, on the basis of parts by mass, 2-30 parts of an acrylic modified silicone resin having affinity for an inorganic powder, 0.3-3 parts of a high-hardness micropowder particle, 2-20 parts of a bifunctional polyurethane acrylic resin B, 10-40 parts of a multifunctional polyurethane acrylic resin, 15-45 parts of an acrylate monomer B, 2-7 parts of an initiator B and 3-40 parts of an additive B, wherein the bifunctional polyurethane acrylic resin A has a soft segment structural unit having a glass transition temperature of −50° C. to 10° C. and a content of 40-80%, the bifunctional polyurethane acrylic resin A is prepared by polymerizing a diol having a molecular weight of 2000-6000 with an isocyanate and a monohydroxy acrylate monomer; the acrylate monomer A is a mixture of a trifunctional monomer and a bifunctional or monofunctional monomer; wherein the acrylic modified silicone resin having affinity for an inorganic powder is prepared by a method comprising the following steps: i) selecting hydroxypolysiloxane to react with an isocyanate to obtain a silicone prepolymer; ii) reacting the silicone prepolymer with a monohydroxy acrylate monomer to prepare an acrylic modified silicone oligomer; iii) reacting the acrylic modified silicone oligomer with a silane coupling agent to prepare an acrylic modified silicone resin having affinity for an inorganic powder; the high-hardness micropowder particle is a powder with a Moh's hardness of not less than 9, the bifunctional polyurethane acrylic resin B has a soft segment structural unit having a glass transition temperature of −50° C. to 10° C. and a content of 40-80%, the bifunctional polyurethane acrylic resin B is prepared by polymerizing a diol having a molecular weight of 2000-6000 with an isocyanate and a monohydroxy acrylate monomer; the glass transition temperature of the multifunctional polyurethane acrylic resin is 50-150° C., and the multifunctional polyurethane acrylic resin is prepared by an end-capping reaction between a polyisocyanate and a hydroxyl-containing acrylate monomer; and the acrylate monomer B is a mixture of a multifunctional acrylate monomer and a bifunctional or monofunctional monomer.

2. The super wear-resistant self-cleaning coating according to claim 1, wherein the content of the bifunctional polyurethane acrylic resin A is 15-40 parts, the content of the bifunctional polyurethane acrylic resin B is 5-10 parts, the diol is one or more selected from a group consisting of polycaprolactone diols, polyester diols, dimer acid modified diols, and polytetrahydrofuran diols; the isocyanate is one or more selected from a group consisting of toluene diisocyanate, isophorone diisocyanate, and 4,4′-bicyclohexylmethane diisocyanate; the monohydroxy acrylate monomer is one or more selected from a group consisting of hydroxyethyl acrylate, hydroxyethyl methacrylate, and hydroxypropyl acrylate.

3. The super wear-resistant self-cleaning coating according to claim 1, wherein for the acrylate monomer A, the trifunctional acrylic monomer is one or more selected from a group consisting of trimethylolpropane triacrylate and ethoxylated trimethylolpropane triacrylate; the bifunctional or monofunctional monomer is one or more selected from a group consisting of hydroxyethyl methacrylate, hydroxypropyl methacrylate, acryloyl morpholine, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, and polyethylene glycol diacrylate.

4. The super wear-resistant self-cleaning coating according to claim 1, wherein the content of the acrylic modified silicone resin having affinity for an inorganic powder is 8-14 parts.

5. The super wear-resistant self-cleaning coating according to claim 3, wherein the high-hardness micropowder particle is one or more selected from a group consisting of diamond micropowder, silicon carbide micropowder, and alumina particles; the high-hardness micropowder particle has a particle size of 1-100 μm.

6. The super wear-resistant self-cleaning coating according to claim 5, wherein the high-hardness micropowder particle has a particle size of 5-20 μm.

7. The super wear-resistant self-cleaning coating according to claim 1, wherein for the multifunctional polyurethane acrylic resin: the polyisocyanate is one or more selected from a group consisting of isophorone diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, HDI dimer, HDI trimer, HDI biuret and IPDI trimer; the hydroxyl-containing acrylate monomer is one or more selected from a group consisting of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, pentaerythritol triacrylate, and dipentaerythritol pentaacrylate; and the content of the multifunctional polyurethane acrylic resin is 15-30 parts.

8. The super wear-resistant self-cleaning coating according to claim 1, wherein for the acrylate monomer B: the multifunctional acrylate monomer is one or more selected from a group consisting of pentaerythritol triacrylate, pentaerythritol tetraacrylate, trimethylolpropane tetraacrylate, and dipentaerythritol hexaacrylate; the bifunctional or monofunctional monomer is one or more selected from a group consisting of dipropylene glycol diacrylate, neopentyl glycol diacrylate, and acryloyl morpholine.

9. The super wear-resistant self-cleaning coating according to claim 1, wherein both the initiator A and the initiator B are photoinitiators; the additive A and the additive B both comprise a dispersant, a defoamer, a leveling agent, a pigment, a matting powder, a flame retardant and a stabilizer, wherein the matting powder is an inorganic or organic matting powder.

Description

DETAILED DESCRIPTION OF THE EMBODIMENTS

(1) In order to facilitate understanding of the present invention, the present invention will be described more fully and meticulously in combination with preferred examples below, but the scope of protection of the present invention is not limited to the following specific examples.

Example 1

(2) A super wear-resistant self-cleaning coating, including a first elastic topcoat and a second self-cleaning topcoat, wherein the first elastic topcoat comprises, on the basis of parts by mass, 20 parts of a bifunctional polyurethane acrylic resin A having a glass transition temperature of −50° C. to 10° C., 5 parts of an initiator A, 50 parts of an acrylate monomer A, and 25 parts of an additive A; the second self-cleaning topcoat comprises, on the basis of parts by mass, 4 parts of an acrylic modified silicone resin having affinity for an inorganic powder, 1 part of a high-hardness micropowder particle, 4 parts of a bifunctional polyurethane acrylic resin B having a glass transition temperature of −50° C. to −10° C., 30 parts of a multifunctional polyurethane acrylic resin having a glass transition temperature of 50-150° C., 35 parts of an acrylate monomer B having a glass transition temperature of 50-150° C., 4 parts of an initiator B and 22 parts of an additive B.

(3) In this example, the bifunctional polyurethane acrylic resin A is prepared by polymerizing a diol with a molecular weight of 2000-6000, an isocyanate and a monohydroxy acrylate monomer. The diol is polycaprolactone diol; the isocyanate is toluene diisocyanate; and the monohydroxy acrylate monomer is hydroxyethyl acrylate.

(4) In this example, the initiator A is 1-hydroxycyclohexyl phenyl ketone (184). The acrylate monomer A is a mixture of 7 parts of ethoxylated trimethylolpropane triacrylate, 10 parts of hydroxyethyl methacrylate, and 33 parts of tripropylene glycol diacrylate.

(5) In this example, the additive A is a mixture of 4 parts of a dispersant, 15 parts of a silica matting powder, 0.5 parts of a defoamer, 0.5 parts of a wetting agent, and 5 parts of a silicon micropowder.

(6) In this example, the acrylate monomer A is a mixture of a trifunctional monomer with a bifunctional or monofunctional monomer, wherein the content of the trifunctional acrylic monomers is 3%; the content of the bifunctional or monofunctional monomer is 20%, the trifunctional acrylic monomer is trimethylolpropane triacrylate; and the bifunctional or monofunctional monomer is hydroxyethyl methacrylate.

(7) In this example, the preparation method of the acrylic modified silicone resin having affinity for an inorganic powder includes the following steps:

(8) i) selecting hydroxypolysiloxane to react with an isocyanate to obtain a silicone prepolymer;

(9) ii) reacting the silicone prepolymer with a monohydroxy acrylate monomer to prepare an acrylic modified silicone oligomer;

(10) iii) reacting the acrylic modified silicone oligomer with a silane coupling agent to prepare an acrylic modified silicone resin having affinity for an inorganic powder;

(11) In this example, the high-hardness micropowder particle is a diamond micropowder with a particle size of 50 μm.

(12) In this example, the bifunctional polyurethane acrylic resin B is prepared by polymerizing a diol with a molecular weight of 2000-6000, an isocyanate, and a monohydroxy acrylate monomer. The diol is polycaprolactone diol; and the monohydroxy acrylate monomer is hydroxyethyl acrylate.

(13) In this example, the multifunctional urethane acrylic resin is prepared by an end-capping reaction between a polyisocyanate and a hydroxyl-containing acrylate monomer. The polyisocyanate is isophorone diisocyanate; and the hydroxyl-containing acrylate monomer is hydroxyethyl acrylate.

(14) In this example, the acrylate monomer B is a mixture of, on the basis of parts by mass, 6 parts of dipentaerythritol hexaacrylate, 10 parts of acryloyl morpholine, and 19 parts of dipropylene glycol diacrylate.

(15) In this example, the initiator B is a mixture of, on the basis of parts by mass, 3 parts of 1-hydroxycyclohexyl phenyl ketone (184) and 1 part of benzophenone (BP).

(16) In this example, the additive B is a mixture of, on the basis of parts by mass, 4 parts of a dispersant, 14 parts of a silica matting powder, 0.5 parts of a defoamer, 0.5 parts of a wetting agent, and 3 parts of a silicon micropowder.

(17) In this example, both the initiator A and the initiator B are photoinitiators which may be any photoinitiator disclosed in the prior art in this field.

(18) In this example, both the additive A and the additive B include a dispersant, a defoamer, a leveling agent, a pigment, a matting powder, a flame retardant and a stabilizer, wherein the matting powder is an inorganic or organic matting powder, and particularly the matting powder is an inorganic matting powder. The above-mentioned components may be any corresponding components disclosed in the prior art in the field.

(19) A method for preparing a super wear-resistant self-cleaning coating, including the following steps:

(20) 1) preparation of a first elastic topcoat: dispersing at high speed a bifunctional polyurethane acrylic resin having a glass transition temperature of −50° C. to 10° C., an initiator A, an acrylate monomer A and an additive A in suitable equipment to the required fineness, and then applying the resultant mixture onto a substrate to obtain the first elastic topcoat coating by radiation curing using UV;

(21) 2) preparation of a second self-cleaning topcoat: dispersing an acrylic modified silicone resin having affinity for an inorganic powder and a high-hardness micropowder particle to obtain a high-hardness particle well-wrapped by silicone; dispersing at high speed the high-hardness particle well-wrapped by silicone together with a bifunctional polyurethane acrylic resin B having a glass transition temperature of −50° C. to 10° C., a multifunctional polyurethane acrylic resin having a glass transition temperature of 50-100° C., an acrylate monomer B having a glass transition temperature of 50-150° C., an initiator B and an additive B in suitable equipment to the required fineness, and then applying the resultant mixture onto the first elastic topcoat coating to obtain a super wear-resistant self-cleaning coating by radiation curing using UV.

Example 2

(22) A super wear-resistant self-cleaning coating, including a first elastic topcoat and a second self-cleaning topcoat, wherein the first elastic topcoat comprises, on the basis of parts by mass, 30 parts of a bifunctional polyurethane acrylic resin A having a glass transition temperature of −50° C. to 10° C., 4.5 parts of an initiator A, 30.5 parts of an acrylate monomer A, and 35 parts of an additive A; the second self-cleaning topcoat comprises, on the basis of parts by mass, 8 parts of an acrylic modified silicone resin having affinity for an inorganic powder, 0.3 parts of a high-hardness micropowder particle, 3 parts of a bifunctional polyurethane acrylic resin B having a glass transition temperature of −50° C. to −10° C., 40 parts of a multifunctional polyurethane acrylic resin having a glass transition temperature of 50-150° C., 30.7 parts of an acrylate monomer B having a glass transition temperature of 50-150° C., 3 parts of an initiator B and 15 parts of an additive B.

(23) In this example, the bifunctional polyurethane acrylic resin A is prepared by polymerizing a diol with a molecular weight of 2000-6000, an isocyanate and a monohydroxy acrylate monomer. The diol is a mixture of polyester diol and dimer acid modified diol; the isocyanate is isophorone diisocyanate; and the monohydroxy acrylate monomer is a mixture of hydroxyethyl acrylate, hydroxyethyl methacrylate, and hydroxypropyl acrylate.

(24) In this example, the acrylate monomer A is a mixture of a trifunctional monomer with a bifunctional or monofunctional monomer, wherein the trifunctional acrylic monomer is trimethylolpropane triacrylate with a content of 5%; the content of the bifunctional or monofunctional monomer is 25.5%, and the bifunctional or monofunctional monomer is a mixture of 5 parts of neopentyl glycol diacrylate, 15.5 parts of dipropylene glycol diacrylate, and 5 parts of hydroxyethyl methacrylate.

(25) In this example, the additive A is a mixture of, on the basis of parts by mass, 5 parts of a dispersant, 12 parts of a silica matting powder, 0.5 parts of a defoamer, 0.2 parts of a leveling agent, 0.5 parts of a wetting agent, and 12.3 parts of a flame retardant.

(26) In this example, the preparation method of the acrylic modified silicone resin having affinity for an inorganic powder includes the following steps:

(27) i) selecting hydroxypolysiloxane to react with an isocyanate to obtain a silicone prepolymer;

(28) ii) reacting the silicone prepolymer with a monohydroxy acrylate monomer to prepare an acrylic modified silicone oligomer;

(29) iii) reacting the acrylic modified silicone oligomer with a silane coupling agent to prepare an acrylic modified silicone resin having affinity for an inorganic powder;

(30) In this example, the high-hardness micropowder particle is a diamond micropowder with a particle size of 20 μm.

(31) In this example, the bifunctional polyurethane acrylic resin B is prepared by polymerizing a diol with a molecular weight of 2000-6000, an isocyanate, and a monohydroxy acrylate monomer. The diol is dimer acid modified glycol; the isocyanate is 4,4′-dicyclohexylmethane diisocyanate; and the monohydroxy acrylate monomer is a mixture of hydroxyethyl methacrylate and hydroxypropyl acrylate.

(32) In this example, the multifunctional urethane acrylic resin is prepared by an end-capping reaction between a polyisocyanate and a hydroxyl-containing acrylate monomer. The polyisocyanate is a mixture of 4,4′-dicyclohexylmethane diisocyanate, HDI dimer, HDI trimer and HDI biuret; and the hydroxyl-containing acrylate monomer is hydroxyethyl methacrylate.

(33) In this example, the acrylate monomer B is a mixture of, on the basis of parts by mass, 5 parts of pentaerythritol triacrylate, 5 parts of trimethylolpropane tetraacrylate, 4 parts of neopentyl glycol diacrylate, and 16.7 parts of dipropylene glycol diacrylate.

(34) In this example, the initiator B is a mixture of, on the basis of parts by mass, 2 parts of 1-hydroxycyclohexyl phenyl ketone (184) and 1 part of (2,4,6-trimethylbenzoyl) diphenylphosphine oxide (TPO).

(35) In this example, the additive B is a mixture of, on the basis of parts by mass, 3 parts of a dispersant, 10.5 parts of a silica matting powder, 0.5 parts of a defoamer, 0.5 parts of a wetting agent, and 0.5 parts of a leveling agent.

(36) A method for preparing a super wear-resistant self-cleaning coating, including the following steps:

(37) 1) preparation of a first elastic topcoat: dispersing at high speed a bifunctional polyurethane acrylic resin having a glass transition temperature of −50° C. to 10° C., an initiator A, an acrylate monomer A and an additive A in suitable equipment to the required fineness, and then applying the resultant mixture onto a substrate to obtain the first elastic topcoat coating by radiation curing using LED;

(38) 2) preparation of a second self-cleaning topcoat: dispersing an acrylic modified silicone resin having affinity for an inorganic powder and a high-hardness micropowder particle to obtain a high-hardness particle well-wrapped by silicone; dispersing at high speed the high-hardness particle well-wrapped by silicone together with a bifunctional polyurethane acrylic resin B having a glass transition temperature of −50° C. to 10° C., a multifunctional polyurethane acrylic resin having a glass transition temperature of 50-100° C., an acrylate monomer B having a glass transition temperature of 50-150° C., an initiator B and an additive B in suitable equipment to the required fineness, and then applying the resultant mixture onto the first elastic topcoat coating to obtain a super wear-resistant self-cleaning coating by radiation curing using EB.

Example 3

(39) A super wear-resistant self-cleaning coating, including a first elastic topcoat and a second self-cleaning topcoat, wherein the first elastic topcoat comprises, on the basis of parts by mass, 40 parts of a bifunctional polyurethane acrylic resin A having a glass transition temperature of −50° C. to 10° C., 6 parts of an initiator A, 39 parts of an acrylate monomer A, and 15 parts of an additive A; the second self-cleaning topcoat comprises, on the basis of parts by mass, 20 parts of an acrylic modified silicone resin having affinity for an inorganic powder, 2 part of a high-hardness micropowder particle, 10 parts of a bifunctional polyurethane acrylic resin B having a glass transition temperature of −50° C. to −10° C., 30 parts of a multifunctional polyurethane acrylic resin having a glass transition temperature of 50-150° C., 31 parts of an acrylate monomer B having a glass transition temperature of 50-150° C., 2 parts of an initiator B and 5 parts of an additive B.

(40) In this example, the bifunctional polyurethane acrylic resin A is prepared by polymerizing a diol with a molecular weight of 2000-6000, an isocyanate and a monohydroxy acrylate monomer. The diol is polytetrahydrofuran diol; the isocyanate is a mixture of toluene diisocyanate, isophorone diisocyanate and 4,4′-dicyclohexylmethane diisocyanate; and the monohydroxy acrylate monomer is a mixture of hydroxyethyl acrylate and hydroxypropyl acrylate.

(41) In this example, the initiator A is a mixture of, on the basis of parts by mass, 3 parts of (2,4,6-trimethylbenzoyl) diphenylphosphine oxide (TPO) and 3 parts of 1-hydroxycyclohexyl phenyl ketone (184).

(42) In this example, the acrylate monomer A is a mixture of, on the basis of parts by mass, 5 parts of trimethylolpropane triacrylate and 34 parts of acryloyl morpholine.

(43) In this example, the additive A is a mixture of, on the basis of parts by mass, 2.7 parts of a dispersant, 12 parts of a polyurea matting powder, and 0.3 parts of a defoamer.

(44) In this example, the acrylate monomer A is a mixture of a trifunctional monomer with a bifunctional or monofunctional monomer, wherein the content of the trifunctional acrylic monomers is 15%; the content of the bifunctional or monofunctional monomer is 30%, the trifunctional acrylic monomer is ethoxylated trimethylolpropane triacrylate; and the bifunctional or monofunctional monomer is a mixture of 1,6-hexanediol diacrylate and neopentyl glycol diacrylate.

(45) In this example, the preparation method of the acrylic modified silicone resin having affinity for an inorganic powder includes the following steps:

(46) i) selecting hydroxypolysiloxane to react with an isocyanate to obtain a silicone prepolymer;

(47) ii) reacting the silicone prepolymer with a monohydroxy acrylate monomer to prepare an acrylic modified silicone oligomer;

(48) iii) reacting the acrylic modified silicone oligomer with a silane coupling agent to prepare an acrylic modified silicone resin having affinity for an inorganic powder;

(49) In this example, the high-hardness micropowder particle is a mixture of, on the basis of parts by mass, 1 part of diamond micropowder with a particle size of 10 μm and 1 part of a silicon carbide micropowder with a particle size of 60 μm.

(50) In this example, the bifunctional polyurethane acrylic resin B is prepared by polymerizing a diol with a molecular weight of 2000-6000, an isocyanate, and a monohydroxy acrylate monomer. The diol is a mixture of polyester diol and dimer acid modified diol; the isocyanate is 4,4′-dicyclohexylmethane diisocyanate; and the monohydroxy acrylate monomer is a mixture of hydroxyethyl methacrylate and hydroxypropyl acrylate.

(51) In this example, the multifunctional urethane acrylic resin is prepared by an end-capping reaction between a polyisocyanate and a hydroxyl-containing acrylate monomer. The polyisocyanate is IPDI trimer; and the hydroxyl-containing acrylate monomer is a mixture of pentaerythritol triacrylate and dipentaerythritol pentaacrylate.

(52) In this example, the acrylate monomer B is a mixture of, on the basis of parts by mass, 10 parts of pentaerythritol triacrylate and 21 parts of acryloyl morpholine.

(53) In this example, the initiator B is phenylbis(2,4,6-trimethylbenzoyl) phosphine oxide (819).

(54) In this example, the additive B is a mixture of, on the basis of parts by mass, 4.5 parts of a silicon micropowder, 0.2 parts of a defoamer, and 0.3 parts of a leveling agent.

(55) A method for preparing a super wear-resistant self-cleaning coating, including the following steps:

(56) 1) preparation of a first elastic topcoat: dispersing at high speed a bifunctional polyurethane acrylic resin having a glass transition temperature of −50° C. to 10° C., an initiator A, an acrylate monomer A and an additive A in suitable equipment to the required fineness, and then applying the resultant mixture onto a substrate to obtain the first elastic topcoat coating by radiation curing using a combination of UV and LED;

(57) 2) preparation of a second self-cleaning topcoat: dispersing an acrylic modified silicone resin having affinity for an inorganic powder and a high-hardness micropowder particle to obtain a high-hardness particle well-wrapped by silicone; dispersing at high speed the high-hardness particle well-wrapped by silicone together with a bifunctional polyurethane acrylic resin B having a glass transition temperature of −50° C. to 10° C., a multifunctional polyurethane acrylic resin having a glass transition temperature of 50-100° C., an acrylate monomer B having a glass transition temperature of 50-150° C., an initiator B and an additive B in suitable equipment to the required fineness, and then applying the resultant mixture onto the first elastic topcoat coating to obtain a super wear-resistant self-cleaning coating by radiation curing using a combination of LED and EB.

Example 4

(58) A super wear-resistant self-cleaning coating, including a first elastic topcoat and a second self-cleaning topcoat, wherein the first elastic topcoat comprises, on the basis of parts by mass, 60 parts of a bifunctional polyurethane acrylic resin A having a glass transition temperature of −50° C. to 10° C., 2 parts of an initiator A, 28 parts of an acrylate monomer A, and 10 parts of an additive A; the second self-cleaning topcoat comprises, on the basis of parts by mass, 15 parts of an acrylic modified silicone resin having affinity for an inorganic powder, 3 part of a high-hardness micropowder particle, 13 parts of a bifunctional polyurethane acrylic resin B having a glass transition temperature of −30° C. to −10° C., 20 parts of a multifunctional polyurethane acrylic resin having a glass transition temperature of 50-150° C., 17 parts of an acrylate monomer B having a glass transition temperature of 50-150° C., 5 parts of an initiator B and 30 parts of an additive B.

(59) In this example, the bifunctional polyurethane acrylic resin A is prepared by polymerizing a diol with a molecular weight of 2000-6000, an isocyanate and a monohydroxy acrylate monomer. The diol is dimer acid modified diol; the isocyanate is a mixture of toluene diisocyanate, isophorone diisocyanate and 4,4′-dicyclohexylmethane diisocyanate; and the monohydroxy acrylate monomer is hydroxyethyl methacrylate.

(60) In this example, the initiator A is phenylbis(2,4,6-trimethylbenzoyl) phosphine oxide (819).

(61) In this example, the acrylate monomer A is a mixture of, on the basis of parts by mass, 8 parts of ethoxylated trimethylolpropane triacrylate, 9 parts of 1,6-hexanediol diacrylate, and 11 parts of hydroxypropyl methacrylate.

(62) In this example, the additive A is a mixture of, on the basis of parts by mass, 2 parts of a dispersant, 7.5 parts of a silica matting powder, and 0.5 parts of a defoamer.

(63) In this example, the preparation method of the acrylic modified silicone resin having affinity for an inorganic powder includes the following steps:

(64) i) selecting hydroxypolysiloxane to react with an isocyanate to obtain a silicone prepolymer;

(65) ii) reacting the silicone prepolymer with a monohydroxy acrylate monomer to prepare an acrylic modified silicone oligomer;

(66) iii) reacting the acrylic modified silicone oligomer with a silane coupling agent to prepare an acrylic modified silicone resin having affinity for an inorganic powder;

(67) In this example, the high-hardness micropowder particle is a mixture of, on the basis of parts by mass, 1 part of diamond micropowder with a particle size of 10 μm, 1 part of a silicon carbide micropowder with a particle size of 30 μm, and 1 part of alumina with a particle size of 30 μm.

(68) In this example, the bifunctional polyurethane acrylic resin B is prepared by polymerizing a diol with a molecular weight of 2000-6000, an isocyanate, and a monohydroxy acrylate monomer. The diol is polyester diol; the isocyanate is isophorone diisocyanate; and the monohydroxy acrylate monomer is hydroxyethyl methacrylate.

(69) In this example, the multifunctional urethane acrylic resin is prepared by an end-capping reaction between a polyisocyanate and a hydroxyl-containing acrylate monomer. The polyisocyanate is 4,4′-dicyclohexylmethane diisocyanate; and the hydroxyl-containing acrylate monomer is hydroxypropyl acrylate.

(70) In this example, the acrylate monomer B is a mixture of, on the basis of parts by mass, 5 parts of trimethylolpropane tetraacrylate, 5 parts of neopentyl glycol diacrylate, and 7 parts of acryloyl morpholine.

(71) In this example, the initiator B is a mixture of, on the basis of parts by mass, 1 part of phenylbis(2,4,6-trimethylbenzoyl) phosphine oxide (819), 2 parts of 2-hydroxy-2-methyl-1-phenyl-1-acetone (1173), 1 part of 4-chlorobenzophenone, and 1 part of active amine.

(72) In this example, the additive B is a mixture of, on the basis of parts by mass, 5 parts of a dispersant, 15 parts of a silica matting powder, 8.5 parts of a wear-resistant powder, 0.5 parts of a defoamer, 0.5 parts of a wetting agent, and 0.5 parts of a leveling agent.

(73) A method for preparing a super wear-resistant self-cleaning coating, including the following steps:

(74) 1) preparation of a first elastic topcoat: dispersing at high speed a bifunctional polyurethane acrylic resin having a glass transition temperature of −50° C. to 10° C., an initiator A, an acrylate monomer A and an additive A in suitable equipment to the required fineness, and then applying the resultant mixture onto a substrate to obtain the first elastic topcoat coating by radiation curing using a combination of UV and EB;

(75) 2) preparation of a second self-cleaning topcoat: dispersing an acrylic modified silicone resin having affinity for an inorganic powder and a high-hardness micropowder particle to obtain a high-hardness particle well-wrapped by silicone; dispersing at high speed the high-hardness particle well-wrapped by silicone together with a bifunctional polyurethane acrylic resin B having a glass transition temperature of −50° C. to 10° C., a multifunctional polyurethane acrylic resin having a glass transition temperature of 50-100° C., an acrylate monomer B having a glass transition temperature of 50-150° C., an initiator B and an additive B in suitable equipment to the required fineness, and then applying the resultant mixture onto the first elastic topcoat coating to obtain a super wear-resistant self-cleaning coating by radiation curing using a combination of UV and EB.