Multi-effect renovating direct-coating intermediate coat and preparation method thereof

Abstract

The invention relates to a multi-effect renovating direct-coating intermediate coat and a preparation method thereof. The multi-effect renovating direct-coating intermediate coat comprises the following components: an acrylic emulsion, hollow glass beads, titanium dioxide, thermoplastic expanded microspheres, calcium sand, modified attapulgite, an auxiliary agent, an adhesion promoter and deionized water. Wherein the modified attapulgite is obtained by reacting an amino silane coupling agent, dialdehyde, chitosan and glycidyl methacrylate with attapulgite. According to the invention, the modified attapulgite is adopted as a thickening agent and is compounded with various components such as the acrylic emulsion, the hollow glass beads and the thermoplastic expanded microspheres, so that the problems of insufficient compatibility of a light material in a coating and poorer water resistance, binding power and stability of a product are solved, the steps of a construction process can be reduced, the time cost is saved, and the construction efficiency is improved. And the coating efficiency is improved, and good application prospects are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and particularly to a multi-effect renovation direct coating intermediate paint and a preparation method thereof. Background Art

[0003] In the renovation and recoating market, due to the complexity of the construction base surface and the particularity of the construction environment, the requirements for coating products are different from those for new house painting. Simpler construction processes are needed, the fewer coating passes the better, and more diverse construction methods to meet the construction of variable base layer environments and shorten the house renovation cycle.

[0004] From the perspective of the current market share of architectural coating products, the consumption of stone-like coatings accounts for more than 65% of the entire architectural coating market. Architectural exterior stone-like coatings mainly include three categories: real stone paint, texture paint, and colorful paint. However, from the perspective of the general coating processes of the above three types of products at present, from the base layer to the surface layer, real stone paint and texture paint require 6 process layers, namely: 2 coats of putty for leveling, 1 coat of alkali-resistant primer; 2 coats of real stone paint or texture paint, 1 coat of topcoat varnish; while the process layer of colorful paint is more complex, and the complete coating process requires 8 layers, namely 2 coats of putty for leveling, 1 coat of alkali-resistant primer; 2 coats of intermediate coat background color paint; 2 coats of colorful paint topcoat, 1 coat of topcoat varnish; Such a complex coating process can no longer meet the industry's needs under the background of the sluggish real estate market, increasingly fierce market competition, and the market facing transformation from the incremental housing market to the stock housing market.

[0005] Moreover, in the prior art, although lightweight materials such as thermoplastic expandable microspheres and hollow glass microspheres are also used in some coating products, the products prepared from such materials have the following problems: the addition of lightweight materials will greatly reduce the adhesion between the product and the base layer; for the products containing these lightweight materials, the paint film is relatively loose, has strong water absorption, and is easy to soften when encountering water; the compatibility of lightweight materials is poor, and problems such as easy agglomeration occur.

[0006] In summary, it is urgent to develop a new technical solution to solve the defects existing in the prior art. Summary of the Invention

[0007] Based on this, the present invention provides a multi-effect renovation direct coating intermediate paint and a preparation method thereof. The present invention uses modified attapulgite as a thickener, which is compounded with various components such as acrylic emulsion, hollow glass microspheres, and thermoplastic expandable microspheres, solves the problems of insufficient compatibility of lightweight materials in coatings, as well as poor water resistance, adhesion, and stability of products, can also reduce the steps of the construction process, save time costs, improve the coating efficiency, and has good application prospects.

[0008] The object of the present invention is to provide a multi-effect renovation direct coating intermediate paint, and the multi-effect renovation direct coating intermediate paint comprises the following components in parts by mass:

[0009]

[0010] Among them,

[0011] The modified attapulgite is obtained by reacting attapulgite with amino silane coupling agent, dialdehyde, chitosan and glycidyl methacrylate.

[0012] Furthermore, the hollow glass microspheres include fine hollow glass microspheres with an average particle size of 0.15 - 0.18 mm and coarse hollow glass microspheres with an average particle size of 0.85 - 0.9 mm.

[0013] Furthermore, the adhesion promoter is selected from one or more of isooctyltriethoxysilane, n-butyltriethoxysilane or n-octyltriethoxysilane.

[0014] Furthermore, the additives are selected from one or more of silane coupling agent, antifreeze, film-forming aid, bactericide, preservative, defoamer, PH regulator.

[0015] Furthermore, the multi-effect renovation direct coating intermediate paint comprises the following components in parts by mass:

[0016]

[0017]

[0018] The adhesion promoter in the present invention is selected from one or two of isooctyltriethoxysilane, n-butyltriethoxysilane or n-octyltriethoxysilane. The adhesion promoter has excellent penetration and reinforcement performance, and significantly improves the water resistance of the paint film.

[0019] The thermoplastic expandable microspheres are composed of a thermoplastic shell, a volatile expander wrapped inside the thermoplastic shell and an organosilicon modifier coated on the surface of the thermoplastic shell. The diameter distribution range of the microspheres is 60 - 80 μm, and the density is 160 ± 10 kg / m 3 . It has the characteristics of low density, excellent mechanical stability and chemical stability.

[0020] The acrylic emulsion is an organosilicon-modified acrylic emulsion with a particle size of 80 nm, and is selected from RS-3799A of Badfu. This is a fine particle size emulsion with a particle size range of 80 - 100 nm, and has good permeability and adhesion.

[0021] The preservative is selected from one or several of 2-methyl-4-isothiazolin-3-one and 1,2-benzisothiazolin-3-one;

[0022] The antifreeze is selected from one or more of propylene glycol and ethylene glycol monobutyl ether;

[0023] The film-forming auxiliary agent is selected from one or more of alcohol ester 12, propylene glycol monobutyl ether, and benzyl alcohol;

[0024] The defoaming agent is selected from one or more of polyether-modified dimethylsiloxane, polysiloxane, and ethylene glycol siloxane;

[0025] The pH regulator (organic amine auxiliary agent) is selected from one or more of 2-amino-2-methyl-1-propanol, diethanolamine, and ammonia water.

[0026] Another object of the present invention is to provide a preparation method of the above multi-effect renovation direct coating intermediate paint, and the preparation method of the multi-effect renovation direct coating intermediate paint includes the following steps:

[0027] S1. Mix attapulgite and an amino-silane coupling agent, after heating and reacting, add a dialdehyde, and after stirring and reacting, obtain an intermediate product;

[0028] S2. Mix the intermediate product and chitosan, heat and react, and then add glycidyl methacrylate to continue reacting to obtain modified attapulgite;

[0029] S3. Mix hollow glass microspheres, an auxiliary agent, and deionized water, and after heating and reacting, obtain a mixed solution;

[0030] S4. Add the modified attapulgite to deionized water, stir, then add the mixed solution, thermoplastic expandable microspheres, and titanium dioxide, stir and disperse, and then add the remaining components to obtain the multi-effect renovation direct coating intermediate paint.

[0031] Further, in step S1, the temperature of the heating reaction is 60-90°C.

[0032] Further, in step S2, the mass ratio of the intermediate product, chitosan, and glycidyl methacrylate is 1:(0.5-1):(0.1-1).

[0033] Further, in step S2, the temperature of the heating reaction is 30-90°C.

[0034] Further, in step S3, the temperature of the heating reaction is 60-90°C.

[0035] Further, the dialdehyde is selected from one or more of glyoxal and glutaraldehyde.

[0036] The present invention has the following beneficial effects:

[0037] The multi-effect renovation direct coating intermediate paint of the present invention uses modified attapulgite as a thickening component. This component first reacts amino-silane coupling agent, dialdehyde with attapulgite to obtain an intermediate product, and then mixes and reacts with chitosan, thereby bonding chitosan to the surface of attapulgite in a covalent bond manner, improving the bonding fastness between chitosan and attapulgite. Finally, the epoxy group of glycidyl methacrylate reacts with the active hydroxyl group in chitosan to introduce double bonds on the surface of the modified attapulgite. The modified attapulgite not only has better thixotropy due to the introduction of chitosan, but also the large number of active groups in chitosan endow attapulgite with better adsorption effect, better compatibility with light components such as thermoplastic expandable microspheres in the formulation system, promoting the uniform dispersion of other components, and also improving the stability of the system and the adhesion of the paint film. The bonding strength with cement, putty or mortar-based walls can reach more than 1.2 MPa; in addition, the introduced double bond structure further promotes the adsorption capacity for glass microspheres treated with KH-570, and the affinity of various components with acrylic emulsion is also stronger, and it can also crosslink through double bonds to form a more stable network structure, thereby greatly improving various properties such as the mechanical strength, solvent resistance and stability of the product.

[0038] The multi-effect renovation direct coating intermediate paint of the present invention also has excellent filling, leveling and color development properties. It can not only be tinted and used instead of the intermediate paint, but also can replace putty to level the base layer and make up for defects. In addition, the paint of the present invention has good workability. The single-pass spraying construction can reach a thickness of 3-5 mm without phenomena such as sagging and cracking; and there are various construction methods, which can be sprayed or applied by troweling, meeting the construction requirements of more complex base surfaces.

[0039] Based on the above performance improvements, compared with the traditional painting process, the multi-effect renovation direct coating intermediate paint of the present invention can greatly shorten the painting process and reduce the material, labor and time costs during the painting process. For example: the painting process of real stone paint and texture paint can be reduced from the traditional 6 processes to 3 processes; the painting process of water-in-oil paint can be reduced from the traditional 8 processes to 4 processes. Detailed implementation mode

[0040] In order to more clearly illustrate the technical solution of the present invention, the following examples are listed. The raw materials, reactions and post-treatment means appearing in the examples are all common raw materials on the market and technical means well-known to those skilled in the art, unless otherwise specified.

[0041] The terms "preferred", "preferably", "more preferred", etc. in the present invention refer to embodiments of the present invention that can provide certain beneficial effects under certain circumstances. However, in the same circumstances or other circumstances, other embodiments may also be preferred. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not available, nor is it intended to exclude other embodiments from the scope of the present invention.

[0042] It should be understood that, except in any operating instance or otherwise indicated, all numbers representing the amounts of ingredients used in the specification and claims, for example, should be understood to be modified in all instances by the term "about". Accordingly, unless indicated to the contrary, the numerical parameters set forth in the following specification and attached claims are approximations that vary depending upon the desired properties sought to be obtained by the present invention.

[0043] The following raw materials are used in the examples of the present invention:

[0044] The acrylic emulsion is Bardgefu RS-3799A;

[0045] The coarse hollow glass microspheres are the hollow microspheres of Xinyie Thermal Insulation Building Materials Co., Ltd., with an average particle size of 0.85 - 0.9 mm;

[0046] The fine hollow glass microspheres are Gesafei L1308B, with an average particle size of 0.15 - 0.18 mm;

[0047] The titanium dioxide is Shandong Dongjia SR-237;

[0048] The thermoplastic expandable microspheres are Guangzhou Songwei MH-60W15;

[0049] The calcium sand is the 80 - 120 mesh snow-white calcium sand of Hubei Jinze Construction Engineering Co., Ltd.;

[0050] The adhesion promoter is isooctyltriethoxysilane or n-butyltriethoxysilane;

[0051] The antifreeze is propylene glycol or ethylene glycol monobutyl ether;

[0052] The film-forming aid is alcohol ester twelve or propylene glycol monobutyl ether or benzyl alcohol;

[0053] The bactericide is Dow K20;

[0054] The preservative is 2-methyl-4-isothiazolin-3-one and 1,2-benzisothiazolin-3-one (BIT);

[0055] The defoamer is Nopco's NXZ defoamer;

[0056] The pH regulator is 2-amino-2-methyl-1-propanol or diethanolamine or ammonia water.

[0057] In the embodiments of the present invention, "parts" all refer to parts by mass.

[0058] Example 1

[0059] A multi-effect renovation direct coating intermediate paint, the multi-effect renovation direct coating intermediate paint comprises the following components in parts by mass:

[0060]

[0061]

[0062] The preparation method of the multi-effect renovation direct coating intermediate paint comprises the following steps:

[0063] S1. Using toluene as a solvent, adding attapulgite, ultrasonically dispersing for 30 min, then adding KH-550, reacting at 70 °C for 10 h, filtering, washing and drying to obtain amino-functionalized attapulgite;

[0064] Adding the amino-functionalized attapulgite into a glutaraldehyde solution (concentration 5 wt%), reacting at 30 °C for 3 h, filtering, washing and drying to obtain an intermediate product;

[0065] Wherein, attapulgite:KH-550:glutaraldehyde = 1:1:7.5, m / m / m;

[0066] S2. Adding 1 g of chitosan into 200 mL of an acetic acid solution (concentration 1 wt%) to obtain a chitosan solution;

[0067] Adding 1 g of the intermediate product into 100 mL of water, stirring and dispersing to obtain a suspension;

[0068] Mixing the chitosan solution and the suspension in a volume ratio of 1:1, stirring and reacting at 30 °C for 5 h, then adding glycidyl methacrylate and a catalyst TEBAC (chitosan:glycidyl methacrylate:TEBAC = 1:1:0.15, m / m / m), reacting at 80 °C for 3 h, filtering, washing and drying to obtain modified attapulgite;

[0069] S3. According to the above parts by mass, mixing coarse and fine hollow glass microspheres, KH-570 and deionized water (50% of the total mass), reacting at 80 °C for 3 h, and cooling to obtain a mixed solution;

[0070] S4. Add the modified attapulgite, propylene glycol, and alcohol ester 12 into the remaining deionized water, disperse at a rotation speed of 800 r / min for 8 min to fully swell and disperse it, then add the mixed solution, MH-60W15, and SR-237, disperse at 1000 r / min for 20 min, then add 2-methyl-4-isothiazolin-3-one, 1,2-benzisothiazolin-3-one, polyether-modified dimethylsiloxane, and 2-amino-2-methyl-1-propanol, stir at 500 r / min for 5 min, then add RS-3799A and calcium sand, stir at 800 r / min for 8 min, and finally add a bactericide and isooctyltriethoxysilane, stir for 5 min to obtain the multi-functional renovation direct coating intermediate paint.

[0071] Example 2

[0072] A multi-functional renovation direct coating intermediate paint, the multi-functional renovation direct coating intermediate paint includes the following components in parts by mass:

[0073]

[0074] The preparation method of the multi-functional renovation direct coating intermediate paint includes the following steps:

[0075] S1. Using toluene as a solvent, add attapulgite, disperse ultrasonically for 30 min, then add KH-550, react at 70 °C for 10 h, filter, wash, and dry to obtain amino-functionalized attapulgite;

[0076] Add the amino-functionalized attapulgite into a glutaraldehyde solution (concentration 5 wt%), react at 30 °C for 3 h, filter, wash, and dry to obtain an intermediate product;

[0077] Among them, attapulgite:KH-550:glutaraldehyde = 1:1:7.5, m / m / m;

[0078] S2. Add 1 g of chitosan into 200 mL of an acetic acid solution (concentration 1 wt%) to obtain a chitosan solution;

[0079] Add 1 g of the intermediate product into 100 mL of water, stir and disperse to obtain a suspension;

[0080] Mix the chitosan solution and the suspension in a volume ratio of 1:1, stir and react at 30 °C for 5 h, then add glycidyl methacrylate and a catalyst TEBAC (chitosan:glycidyl methacrylate:TEBAC = 1:1:0.15, m / m / m), react at 80 °C for 3 h, filter, wash, and dry to obtain modified attapulgite;

[0081] S3. According to the above mass parts, mix coarse and fine hollow glass microspheres, KH-570 and deionized water (50% of the total mass), react at 80 °C for 3 h, and cool to obtain a mixed solution;

[0082] S4. Add the modified attapulgite, ethylene glycol monobutyl ether, and propylene glycol monobutyl ether to the remaining deionized water, disperse at a rotation speed of 800 r / min for 8 min to fully swell and disperse, then add the mixed solution, MH-60W15, and SR-237, disperse at 1000 r / min for 20 min, then add 2-methyl-4-isothiazolin-3-one, 1,2-benzisothiazolin-3-one, polyether-modified dimethylsiloxane, and diethanolamine, stir at 500 r / min for 5 min, then add RS-3799A and calcium sand, stir at 800 r / min for 8 min, and finally add a bactericide and n-butyltriethoxysilane, stir for 5 min to obtain the multi-functional renovation direct coating intermediate paint.

[0083] Example 3

[0084] A multi-functional renovation direct coating intermediate paint, the multi-functional renovation direct coating intermediate paint includes the following components in mass parts:

[0085]

[0086] The preparation method of the multi-functional renovation direct coating intermediate paint includes the following steps:

[0087] S1. Using toluene as a solvent, add attapulgite, ultrasonically disperse for 30 min, then add KH-550, react at 70 °C for 10 h, filter, wash, and dry to obtain amino-functionalized attapulgite;

[0088] Add the amino-functionalized attapulgite to a glutaraldehyde solution (concentration 5 wt%), react at 30 °C for 3 h, filter, wash, and dry to obtain an intermediate product;

[0089] Among them, attapulgite:KH-550:glutaraldehyde = 1:1:7.5, m / m / m;

[0090] S2. Add 1 g of chitosan to 200 mL of acetic acid solution (concentration 1 wt%) to obtain a chitosan solution;

[0091] Add 1 g of the intermediate product to 100 mL of water, stir and disperse to obtain a suspension;

[0092] Mix the chitosan solution and the suspension in a volume ratio of 1:1, stir and react at 30 °C for 5 h, then add glycidyl methacrylate and catalyst TEBAC (chitosan:glycidyl methacrylate:TEBAC = 1:1:0.15, m / m / m), react at 80 °C for 3 h, filter, wash, and dry to obtain modified attapulgite;

[0093] S3. Mix the coarse and fine hollow glass microspheres, KH-570, and deionized water (50% of the total mass) according to the above parts by mass, react at 80 °C for 3 h, and cool to obtain a mixed solution.

[0094] S4. Add the modified attapulgite, propylene glycol, and benzyl alcohol to the remaining deionized water, disperse at a rotation speed of 800 r / min for 8 min to fully swell and disperse, then add the mixed solution, MH-60W15, and SR-237, disperse at 1000 r / min for 20 min, then add 2-methyl-4-isothiazolin-3-one, 1,2-benzisothiazolin-3-one, polyether-modified dimethylsiloxane, and ammonia water, stir at 500 r / min for 5 min, then add RS-3799A and calcium sand, stir at 800 r / min for 8 min, and finally add a bactericide and n-butyltriethoxysilane, stir for 5 min to obtain the multi-effect renovation direct coating intermediate paint.

[0095] Comparative Example 1

[0096] The difference between this comparative example and Example 1 is that amino-functionalized attapulgite is used to replace the modified attapulgite, and other components and preparation methods are the same as those in Example 1.

[0097] Comparative Example 2

[0098] The difference between this comparative example and Example 1 is that in step S2, glycidyl methacrylate is not added, and other components and preparation methods are the same as those in Example 1.

[0099] Comparative Example 3

[0100] The difference between this comparative example and Example 1 is that KH-570 is not added, and at the same time, step S4 is modified as follows:

[0101] Add the modified attapulgite to the remaining deionized water, disperse at a rotation speed of 800 r / min for 8 min to fully swell and disperse, then add the mixed solution, MH-60W15, and SR-237, disperse at 1000 r / min for 20 min, then add propylene glycol, ethylhexyl lactate, 2-methyl-4-isothiazolin-3-one, 1,2-benzisothiazolin-3-one, polyether-modified dimethylsiloxane, and 2-amino-2-methyl-1-propanol, stir at 500 r / min for 5 min, then add RS-3799A and calcium sand, stir at 800 r / min for 8 min, and finally add a bactericide and isooctyltriethoxysilane, stir for 5 min to obtain the multi-effect renovation direct coating intermediate paint; other components and preparation methods are the same as those in Example 1.

[0102] Test Example

[0103] The performance tests were carried out on the samples prepared in the examples and comparative examples and the commercially available product (SKS-SGZ902) with reference to JG / T 157-2009.

[0104] The test results are shown in Table 1.

[0105] Table 1 Test Results

[0106]

[0107] It can be concluded from Table 1 that the multi-effect renovation direct coating intermediate paint of the embodiment of the present invention has excellent construction performance, without sagging and cracking phenomena; the bonding strength under standard conditions is above 1.5 MPa, far higher than the standard requirement of 0.6 MPa; the bonding strength after freeze-thaw cycle is above 1.2 MPa, far higher than the standard requirement of 0.4 MPa, indicating that the present invention has good adhesion to the base layer; at the same time, the contrast ratio is greater than 0.89, having a good covering effect on the base layer; the dynamic anti-cracking is greater than 0.5 mm, and the flexibility also meets the highest standard requirements, and there are no cracks after bending at 50 mm, having a good covering effect on the fine cracks of the base layer; from the perspective of the initial drying anti-cracking performance, when the single-pass thick coating of the product of the present technical invention is 5.0 mm, no cracking phenomenon occurs, indicating that the film-forming property and flexibility of the present invention are excellent, and the shrinkage rate is low, which lays a foundation for the excellent filling and leveling functions shown in the application process of the product.

[0108] In Comparative Example 1-2, the modified attapulgite was replaced, resulting in a decrease in the compatibility and affinity between components, making it difficult to obtain a good synergistic effect, and the performance of the paint film such as adhesion, flexibility, and anti-cracking decreased significantly; in Comparative Example 3, the formula components were modified, and the film-forming aid and antifreeze were not used to pre-dissolve the modified attapulgite in advance, resulting in the formation of small particle agglomerates in the components, uneven dispersion, and a decrease in the bonding degree between the glass beads, emulsion, and attapulgite. Therefore, various performances decreased to varying degrees.

[0109] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

[0110] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-effect renovation direct coating mid-coat paint, characterized in that: The multi-effect renovation direct coating intermediate paint comprises the following components in parts by mass: in, The modified attapulgite is obtained by reacting an aminosilane coupling agent, a dialdehyde, chitosan and glycidyl methacrylate with attapulgite.

2. The multi-effect renovation direct coating mid-coat paint according to claim 1, characterized in that: The hollow glass microspheres include fine hollow glass microspheres with an average particle size of 0.15-0.18 mm and coarse hollow glass microspheres with an average particle size of 0.85-0.9 mm.

3. The multi-effect renovation direct coating mid-coat paint according to claim 1, characterized in that: The adhesion promoter is selected from one or more of isooctyltriethoxysilane, n-butyltriethoxysilane or n-octyltriethoxysilane.

4. The multi-effect renovation direct coating mid-coat paint according to claim 1, characterized in that: The auxiliary agent is selected from one or more of a silane coupling agent, an antifreeze agent, a film-forming aid, a bactericide, a preservative, a defoaming agent, and a pH regulator.

5. The multi-effect renovation direct coating intermediate paint according to claim 4 is characterized in that: The multi-effect renovation direct coating intermediate paint comprises the following components in parts by mass:

6. The method for preparing the multi-effect renovation direct coating mid-coat according to any one of claims 1 to 5, characterized in that: The preparation method of the multi-effect renovation direct coating intermediate paint comprises the following steps: S1, mixing attapulgite and an aminosilane coupling agent, heating for reaction, adding a dialdehyde, stirring for reaction, and obtaining an intermediate product; S2, mixing the intermediate product and chitosan, heating for reaction, and then adding glycidyl methacrylate to continue the reaction to obtain modified attapulgite; S3, mixing the hollow glass microspheres, the additive and deionized water, and heating them for reaction to obtain a mixed solution; S4. Add the modified attapulgite into deionized water, stir, add the mixed solution, thermoplastic expanded microspheres and titanium dioxide, stir and disperse, and then add the remaining ingredients to obtain the multi-effect renovation direct-coating intermediate paint.

7. The method for preparing the multi-effect renovation direct coating intermediate paint according to claim 6, characterized in that: In step S1, the temperature of the heating reaction is 60-90°C.

8. The method for preparing the multi-effect renovation direct coating intermediate paint according to claim 6, characterized in that: In step S2, the mass ratio of the intermediate product, chitosan and glycidyl methacrylate is 1:(0.5-1):(0.1-1).

9. The method for preparing the multi-effect renovation direct coating intermediate paint according to claim 6, characterized in that: In step S2, the temperature of the heating reaction is 30-90°C.

10. The method for preparing the multi-effect renovation direct coating intermediate paint according to claim 6, characterized in that: In step S3, the temperature of the heating reaction is 60-90°C.

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