CN114736568B

CN114736568B - Water-based nano silicon dioxide coating and application method thereof

Info

Publication number: CN114736568B
Application number: CN202210249662.7A
Authority: CN
Inventors: 彭学强; 洪伟强; 陈云
Original assignee: China Paints Shenzhen Co ltd
Current assignee: China Paints Shenzhen Co ltd
Priority date: 2022-03-14
Filing date: 2022-03-14
Publication date: 2023-08-18
Anticipated expiration: 2042-03-14
Also published as: CN114736568A

Abstract

The invention belongs to the technical field of coatings, and particularly relates to a water-based nano silicon dioxide coating and a using method of the coating. The water-based nano silicon dioxide coating disclosed by the invention has the advantages of high hardness, good hot hardness, good anti-back adhesion, high wear resistance, good adhesive force, high gloss, good paint film flexibility, low-temperature crosslinking, environmental protection and energy conservation, and accords with the environment-friendly concept by jointly applying the components such as the water-based acrylic resin, the water-based nano silicon dioxide, the water-based amino resin, the cooling agent, the adhesion promoter and the like, wherein the mass percentage of the hydroxyl groups of the components is 3.0-3.5%. The application method of the water-based nano silicon dioxide coating is simple and convenient, and is convenient for construction and industrial application. In addition, the water-based nano silicon dioxide coating is subjected to low-temperature crosslinking curing, so that the energy consumption for drying and curing the coating and the emission of organic solvents can be reduced, the atmospheric pollution can be reduced, the use is safe, the environment is protected, and the construction performance is good. In addition, the fire-resistant material has nonflammable fire resistance, and is safer to produce, store and transport.

Description

Water-based nano silicon dioxide coating and application method thereof

Technical Field

The invention belongs to the technical field of coatings, and particularly relates to a water-based nano silicon dioxide coating and a using method of the coating.

Background

Some tools in life need to be used under high temperature conditions, such as an electric iron, and work at high temperature of 100-120 ℃, the surface coating is easy to soften, and the abrasion of the surface coating is increased in the use process. Regarding the problems of easy softening and aggravation of coating abrasion of the surface coating in a high-temperature working environment, the existing solution is to add inorganic powder into the coating and apply a high-temperature crosslinking reaction exceeding 160 ℃, but the disadvantage of applying the high-temperature crosslinking reaction is that the energy consumption is large when the coating is dried and solidified, the problem of high energy consumption exists, and the method does not accord with the low-carbon, green and environment-friendly concepts.

At present, a plurality of water-based silica coatings exist on the market, but a lot of the coatings simply and physically blend silica with raw materials such as resin, and the like, and the silica and the resin lack sufficient interaction, so that the problem of silica agglomeration easily occurs, and the surface mechanical property of the coating cannot be obviously improved. The existing coating generally has the problems of low coating hardness, hot hardness deviation and poor flexibility. In addition, part of the aqueous silica paint is subjected to hydrolysis reaction by silica and a silane coupling agent under a wet condition, the paint is required to be constructed under the wet condition, and the construction condition is high.

Disclosure of Invention

The present invention provides another aqueous nano silica coating, a method for preparing the aqueous nano silica coating, and a method for using the aqueous nano silica coating.

In a first aspect of the present invention, an aqueous nanosilica coating is provided. The water-based nano silicon dioxide coating comprises the following components in percentage by mass:

preferably, the aqueous acrylic resin is a resin formed by copolymerizing acrylic acid esters, methacrylic acid esters and other olefinic monomers, and the mass percentage of hydroxyl groups in the aqueous acrylic resin is 3.0% -3.5%.

Preferably, the aqueous amino resin is a methyl etherified homoiminomelamine resin.

Preferably, the neutralizing agent is N, N-dimethylethanolamine.

Preferably, the cooling agent is a closed acid catalyst.

More preferably, the cooling agent is an amine blocked dinonyl naphthalene disulfonic acid catalyst.

Preferably, the adhesion promoter is an aryl phosphate adhesion promoter or an alkyl phosphate adhesion promoter.

Preferably, the leveling agent is a siloxane leveling agent, a polyester leveling agent or an alkyl vinyl ether copolymer leveling agent.

Preferably, the defoaming agent is an organosilicon defoaming agent.

Preferably, the solute of the aqueous nanosilica solution is grafted- (CH) on the silica molecule ₂ ) _n Molecules of OH reactive groups, said n=3, 4 or 5, the mass percentage of active hydroxyl groups in the solute is 2.5% -3.5%.

In a second aspect of the present invention, a method of preparing the above-described aqueous nanosilica coating is provided. The preparation method of the water-based nano silicon dioxide coating comprises the following steps:

the components forming the water-based nano silicon dioxide coating are respectively weighed according to the proportion, and then the components are uniformly mixed.

In a third aspect of the present invention, a method of using the above-described aqueous nanosilica coating is provided. The application method of the water-based nano silicon dioxide coating comprises the following steps:

diluting the water-based nano silicon dioxide coating with deionized water to obtain a diluted coating, wherein the viscosity of the diluted coating is 18-30S when tested by an NK-2 rock field cup, and the testing temperature is 25 ℃; applying the diluted paint to the surface of the workpiece which has been pretreated; and then drying the workpiece to obtain a coated workpiece, wherein the thickness of a coating on the coated workpiece is 20-25 mu m.

Preferably, the pretreatment is to remove oil and dust from the workpiece.

Preferably, the drying temperature of the drying treatment is 100-110 ℃ and the drying time is 30-40min.

More preferably, the method of drying treatment includes oven drying or tunnel drying.

Preferably, the coating mode comprises spraying, knife coating, brush coating and rolling coating.

Compared with the prior art, the invention has the following beneficial effects:

the water-based nano silicon dioxide coating disclosed by the invention has the advantages of high hardness, good hot hardness, good anti-back adhesion, high wear resistance, good adhesive force, high gloss, good paint film flexibility, low-temperature crosslinking, environmental protection and energy conservation, and accords with the environment-friendly concept by jointly applying the components such as the water-based acrylic resin, the water-based nano silicon dioxide, the water-based amino resin, the cooling agent, the adhesion promoter and the like, wherein the mass percentage of the hydroxyl groups of the components is 3.0-3.5%. In particular to an applied aqueous nano-silica solution,the solute water-based nano silicon dioxide is- (CH) with ultra-short chains grafted on silicon dioxide molecules ₂ ) _n The mass percentage of OH molecules and active hydroxyl groups is 2.5-3.5%, and methyl etherified high imino melamine resin is used, so that the aqueous nano silicon dioxide can be crosslinked and solidified with amino resin at low temperature (100-110 ℃) to enable the aqueous nano silicon dioxide to be connected in a paint film, and form a three-dimensional network with alternating organic phase and inorganic phase, thereby reducing softening and stretching of organic molecular chains under high temperature condition and enabling the coating to have better hot hardness.

The application method of the water-based nano silicon dioxide coating provided by the invention is that the coating can be coated on the surface of a pretreated workpiece after being diluted by deionized water, and the coated workpiece can be obtained after being dried. In addition, the water-based nano silicon dioxide coating disclosed by the invention is crosslinked and cured at a low temperature, so that the energy consumption for drying and curing the coating and the emission of an organic solvent can be reduced, the atmospheric pollution is lightened, the use is safe, the environment is protected, and the construction performance is good. In addition, the water-based nano silicon dioxide coating disclosed by the invention has nonflammable fireproof performance, can effectively reduce fire disaster, is safer to produce, store and transport, and is convenient to use.

Detailed Description

The present invention will be described in detail by way of specific examples. The scope of the present invention is not limited to the following embodiments.

The water-based nano silicon dioxide coating provided by the invention can be widely applied to the surface treatment process of various metal products. The water-based nano silicon dioxide coating provided by the embodiment of the invention has the characteristics of high hardness, good hot hardness, good adhesive force, high gloss, good flexibility, low-temperature crosslinking, environmental protection, energy conservation and the like, so that the water-based nano silicon dioxide coating provided by the embodiment of the invention is suitable for decorative top-coat of light industrial products, such as various products of metals, bakelite and the like.

In the embodiment of the invention, the water-based acrylic resin and the water-based nano silicon dioxide (the mass percentage of the active hydroxyl is 2.5% -3.5%) are matched with the water-based amino resin and the adhesion promoter, the softening and the stretching of organic molecular chains are reduced under the high temperature condition, the thermal hardness is kept well, and the hardness, the thermal hardness and the flexibility of the water-based nano silicon dioxide coating can be effectively improved.

In the embodiment of the invention, the aqueous amino resin is preferably methyl etherified high imino melamine resin, and the application of the methyl etherified high imino melamine resin can provide low-temperature reaction activity and crosslinking of the aqueous nano silicon dioxide coating, so that the chemical resistance of the coating is effectively improved.

In the embodiment of the invention, the preferred cooling agent is a closed acid catalyst, more preferred the preferred cooling agent is an amine-closed dinonyl naphthalene disulfonic acid catalyst, and the application of the amine-closed dinonyl naphthalene disulfonic acid catalyst can ensure the stability of the water-based nano silicon dioxide coating, effectively reduce the temperature of the cross-linking reaction of the water-based silicon dioxide solution, the water-based acrylic resin and the amino resin, and realize low-temperature cross-linking and solidification, thereby ensuring various performances of a paint film.

In the embodiment of the invention, preferably, the adhesion promoter is an aryl phosphate promoter or an alkyl phosphate promoter. Adhesion promoters are particularly important for coated metal surfaces because metals are unstable, and the coating of the paint typically has micropores within it that are permeable to oxygen, water molecules, water and ionic species that accelerate the oxidation process of the metal. Corrosion due to penetration can be avoided if the coating adheres well to the metal surface. The aryl phosphate adhesion promoter or alkyl phosphate adhesion promoter is a novel adhesion promoter, has wider solubility, can improve the adhesion of a coating system, obviously improves the binding force of the coating and various base materials, and improves the moisture resistance, salt fog resistance and heat resistance of the coating. And the aryl phosphate adhesion promoter or the alkyl phosphate adhesion promoter is relatively stable in the aqueous nano-silica coating system.

In the embodiment of the invention, preferably, the leveling agent is a siloxane leveling agent, a polyester leveling agent or an alkyl vinyl ether copolymer leveling agent. The leveling agent is a common coating auxiliary agent, can promote the coating to form a flat, smooth and uniform coating film in the drying and film forming process, can effectively reduce the surface tension of the coating, improve the leveling property, wettability and uniformity of the coating, improve the permeability of the coating, reduce spots and marks generated in brushing, improve the coverage and ensure that the film forming is uniform and natural. The siloxane, polyester or alkyl vinyl ether copolymer has good surface state control capability, can effectively improve the compatibility of the water-based nano silicon dioxide coating, has the capability of reducing surface tension and controlling surface flow, and has the effects of slip-increasing, shrinkage cavity resisting and adhesion resisting.

In the embodiment of the invention, preferably, the defoaming agent is an organosilicon defoaming agent. The defoaming agent is used for inhibiting and eliminating foam, and the organic silicon type defoaming agent generally comprises polydimethylsiloxane and the like, and has high defoaming speed and good foam inhibiting effect at normal temperature. The defoamer applied in the embodiment of the invention can effectively improve the stability of the water-based nano silicon dioxide coating.

In the embodiment of the invention, preferably, the neutralizing agent is N, N-dimethylethanolamine. The neutralizing agent can make the water-based acrylic resin form high molecular resin salt in the paint and dissolve in water, and has an improving effect on the water solubility of the acrylic resin in the paint, the storage stability, the viscosity and the curing speed of the paint and the yellowing property of a paint film. N, N-dimethylethanolamine is a high-efficiency amine neutralizer, is in a liquid state, has certain hygroscopicity, mild alkalinity and good water solubility, has the effects of adjusting, stabilizing, assisting solvents and the like, can effectively improve the solubility and stability of the water-based nano silicon dioxide coating, ensures that the water solubility of the coating is good, and a coating film is not yellowing and is dried relatively quickly.

Specifically, in the following examples, the aqueous amino resin is a methyl etherified homoiminomelamine resin (amino resin CYMEL 325 or amino resin CYMEL 303LF of the company cytet, usa); the temperature reducing agent is an amine-blocked dinonyl naphthalene disulfonic acid catalyst (U.S. gold X49110); the adhesion promoter is aryl phosphate adhesion promoter (Kazuki trade company J105A) or alkyl phosphate adhesion promoter (Ke Lisen resin Co., ltd. KN 803A); the leveling agent is a siloxane leveling agent (BYK 333), a polyester leveling agent (Ucat chemistry 350W) or an alkyl vinyl ether copolymer leveling agent (German Degao 410); the defoamer is an organosilicon defoamer (German Degao 902W); the neutralizing agent is N, N-dimethylethanolamine (DMEA from BASF); the water-based acrylic resin used was KW-8753 (3.0% by mass of hydroxyl group) from Kehuai Utility Co., ltd., ZTC02 (1.6% by mass of hydroxyl group) from Sharplike chemical Co., ltd., 1AB911Y (2.4% by mass of hydroxyl group) or AC-8254 (4.2% by mass of hydroxyl group) from Fuqisen New Material Co., ltd.

The composition of the aqueous nano-silica coating of the present invention uses an aqueous nano-silica solution to provide the aqueous nano-silica. In the following examples, the aqueous nanosilica solution used was PW-30 of Tongtai chemistry, the mass percentage concentration of the solute (aqueous nanosilica) was 35%, the mass percentage of the active hydroxyl groups in the aqueous nanosilica was 2.7%; or CY-S01 of Jiupong New Material Co., ltd., the solute of the solution is nano silica grafted with long chain active reactive groups.

Example 1

The embodiment provides a water-based nano silicon dioxide coating and a preparation method thereof. The water-based nano silicon dioxide coating is prepared by uniformly mixing the following raw material components:

55% of aqueous acrylic resin (KW-8753), 12% of aqueous amino resin (CYMEL 325), 0.5% of cooling agent, 3% of adhesion promoter (J105A), 0.2% of flatting agent (BYK 333), 0.2% of defoaming agent, 3% of neutralizing agent, 10% of aqueous nano silicon dioxide solution (PW-30) and 16.1% of deionized water.

Example 2

55% of aqueous acrylic resin (KW-8753), 12% of aqueous amino resin (CYMEL 325), 0.5% of cooling agent, 3% of adhesion promoter (J105A), 0.2% of flatting agent (BYK 333), 0.2% of defoaming agent, 3% of neutralizing agent, 5% of aqueous nano silicon dioxide solution (PW-30) and 21.1% of deionized water.

Example 3

55% of water-based acrylic resin (KW-8753), 12% of water-based amino resin (CYMEL 325), 0.5% of cooling agent, 3% of adhesion promoter (J105A), 0.2% of flatting agent (BYK 333), 0.2% of defoaming agent, 3% of neutralizing agent and 26.1% of deionized water.

Example 4

55% of aqueous acrylic resin (1 AB 911Y), 12% of aqueous amino resin (CYMEL 325), 0.5% of cooling agent, 3% of adhesion promoter (J105A), 0.2% of flatting agent (BYK 333), 0.2% of defoaming agent, 3% of neutralizing agent, 10% of aqueous nano silicon dioxide solution (PW-30) and 16.1% of deionized water.

Example 5

55% of aqueous acrylic resin (1 AB 911Y), 12% of aqueous amino resin (CYMEL 325), 0.5% of cooling agent, 3% of adhesion promoter (J105A), 0.2% of flatting agent (BYK 333), 0.2% of defoaming agent, 3% of neutralizing agent, 5% of aqueous nano silicon dioxide solution (PW-30) and 21.1% of deionized water.

Example 6

55% of aqueous acrylic resin (1 AB 911Y), 12% of aqueous amino resin (CYMEL 325), 0.5% of cooling agent, 3% of adhesion promoter (J105A), 0.2% of flatting agent (BYK 333), 0.2% of defoaming agent, 3% of neutralizing agent and 26.1% of deionized water.

Example 7

55% of water-based acrylic resin (ZTC 02), 12% of water-based amino resin (CYMEL 325), 0.5% of cooling agent, 3% of adhesion promoter (J105A), 0.2% of flatting agent (BYK 333), 0.2% of defoaming agent, 3% of neutralizing agent, 10% of water-based nano silicon dioxide solution (PW-30) and 16.1% of deionized water.

Example 8

55% of aqueous acrylic resin (KW-8753), 12% of aqueous amino resin (CYMEL 325), 0.5% of cooling agent, 3% of adhesion promoter (KN 803A), 0.2% of flatting agent (BYK 333), 0.2% of defoaming agent, 3% of neutralizing agent, 10% of aqueous nano silicon dioxide solution (PW-30) and 16.1% of deionized water.

Example 9

55% of aqueous acrylic resin (KW-8753), 12% of aqueous amino resin (CYMEL 325), 0.5% of cooling agent, 3% of adhesion promoter (J105A), 0.2% of leveling agent (350W), 0.2% of defoaming agent, 3% of neutralizing agent, 10% of aqueous nano silicon dioxide solution (PW-30) and 16.1% of deionized water.

Example 10

55% of aqueous acrylic resin (KW-8753), 12% of aqueous amino resin (CYMEL 325), 0.5% of cooling agent, 3% of adhesion promoter (J105A), 0.2% of leveling agent (German Digao 410), 0.2% of defoaming agent, 3% of neutralizing agent, 10% of aqueous nano silicon dioxide solution (PW-30) and 16.1% of deionized water.

Example 11

50% of aqueous acrylic resin (KW-8753), 15% of aqueous amino resin (CYMEL 325), 0.5% of cooling agent, 3% of adhesion promoter (J105A), 0.2% of flatting agent (BYK 333), 0.2% of defoaming agent, 3% of neutralizing agent, 5% of aqueous nano silicon dioxide solution (PW-30) and 23.1% of deionized water.

Example 12

60% of aqueous acrylic resin (KW-8753), 10% of aqueous amino resin (CYMEL 325), 0.5% of cooling agent, 3% of adhesion promoter (J105A), 0.2% of flatting agent (BYK 333), 0.2% of defoaming agent, 3% of neutralizing agent, 2% of aqueous nano silicon dioxide solution (PW-30) and 21.1% of deionized water.

Example 13

55% of aqueous acrylic resin (KW-8753), 12% of aqueous amino resin (CYMEL 325), 0.2% of cooling agent, 2% of adhesion promoter (J105A), 0.3% of flatting agent (BYK 333), 0.3% of defoaming agent, 2% of neutralizing agent, 10% of aqueous nano silicon dioxide solution (PW-30) and 18.2% of deionized water.

Example 14

55% of aqueous acrylic resin (KW-8753), 12% of aqueous amino resin (CYMEL 325), 0.4% of cooling agent, 2.5% of adhesion promoter (J105A), 0.2% of flatting agent (BYK 333), 0.1% of defoaming agent, 5% of neutralizing agent, 10% of aqueous nano silicon dioxide solution (PW-30) and 14.8% of deionized water.

Example 15

55% of aqueous acrylic resin (KW-8753), 12% of aqueous amino resin (CYMEL 303 LF), 0.5% of cooling agent, 3% of adhesion promoter (J105A), 0.2% of flatting agent (BYK 333), 0.2% of defoaming agent, 3% of neutralizing agent, 10% of aqueous nano silicon dioxide solution (PW-30) and 16.1% of deionized water.

Example 16

55% of aqueous acrylic resin (AC-8254), 12% of aqueous amino resin (CYMEL 325), 0.5% of cooling agent, 3% of adhesion promoter (J105A), 0.2% of flatting agent (BYK 333), 0.2% of defoaming agent, 3% of neutralizing agent, 10% of aqueous nano silicon dioxide solution (PW-30) and 16.1% of deionized water.

Example 17

55% of aqueous acrylic resin (KW-8753), 12% of aqueous amino resin (CYMEL 325), 0.5% of cooling agent, 3% of adhesion promoter (J105A), 0.2% of flatting agent (BYK 333), 0.2% of defoaming agent, 3% of neutralizing agent, 10% of aqueous nano silicon dioxide solution (CY-S01) and 16.1% of deionized water.

Example 18

55% of aqueous acrylic resin (AC-8254), 12% of aqueous amino resin (CYMEL 303 LF), 0.5% of cooling agent, 3% of adhesion promoter (J105A), 0.2% of flatting agent (BYK 333), 0.2% of defoaming agent, 3% of neutralizing agent, 10% of aqueous nano silicon dioxide solution (CY-S01) and 16.1% of deionized water.

The method for using the aqueous nano-silica coating prepared in the above example is as follows:

diluting the water-based nano silicon dioxide coating with deionized water to obtain a diluted coating, wherein the viscosity of the diluted coating is 25S (the testing temperature is 25 ℃) when the water-based nano silicon dioxide coating is tested by using an NK-2 rock field cup;

spraying the diluted coating on the surface of a workpiece subjected to oil removal and dust removal pretreatment, and controlling the thickness of the coating after the coating is dried to be within the range of 20-25 mu m by controlling the spraying amount;

and then drying the workpiece by using an oven at a drying temperature of 105 ℃ for 35min to obtain the coated workpiece.

In other embodiments, the viscosity of the coating after dilution may also be such that the NK-2 field cup test has a run-out time in the range of 18-30S (test temperature 25 ℃); the coating can be applied by knife coating, brush coating, roll coating and the like; the drying temperature of the drying treatment can be controlled within the range of 100-110 ℃, the drying time can be controlled within the range of 30-40min, and other modes such as tunnel drying can be selected as the drying mode.

Performance testing

The properties of the aqueous nano silica coating prepared in the above examples were respectively tested and are shown in table 1 below.

TABLE 1

Test item	Test substrate	Test standard
			Gloss level	Tinplate	GB/T4893.6-1985
Hardness of	Tinplate	GB/T6739-2006
			Hot hardness	Tinplate	Testing at 100deg.C
Back tack	Tinplate	GB1762-1980
			Adhesion force	Tin plate, aluminum sheet, galvanized sheet and steel sheet	GB/T9286-1998
Alcohol resistance (1 kg)	Tinplate	/
			Impact	Tinplate	GB/T1732-1993
Salt spray resistance	Steel sheet	ISO 9227:2012

The test results are shown in table 2 below.

TABLE 2

As can be seen from the comparison of the performance tests, the aqueous nano silicon dioxide coating prepared by the embodiment 1 of the invention can reduce the softening and stretching of organic molecular chains under the high-temperature condition, has good hot hardness, high hardness, good hot hardness, good anti-back adhesion, high wear resistance, good adhesive force, high gloss, good flexibility of a paint film, low-temperature crosslinking, environmental protection, energy saving and the like. In addition, the water-based nano silicon dioxide coating prepared in the embodiment 1 of the invention has the characteristic of nonflammability, can effectively reduce fire occurrence, and is safer to produce, store and transport.

The aqueous nano-silica coating prepared in example 3 is free of grafted ultrashort chain reactive group- (CH) ₂ ) _n The hardness, hot hardness and back tack of the aqueous nano-silica of OH are all significantly worse than those of the aqueous nano-silica coating prepared in example 1. The aqueous nano-silica coating prepared in example 6 also resulted from the absence of grafted ultrashort chain reactive group- (CH) ₂ ) _n The hardness, hot hardness and back tack of the aqueous nano-silica of OH are all significantly worse than those of the aqueous nano-silica coating prepared in example 2.

The aqueous nano silica coating prepared in example 4 has inferior gloss compared with the aqueous nano silica coating prepared in example 2 because of using the aqueous acrylic resin having a low hydroxyl group content. The aqueous nano silica coating prepared in example 7 has poorer gloss than the aqueous nano silica coatings prepared in examples 1 and 4 because of the use of the aqueous acrylic resin having lower hydroxyl group content. Meanwhile, the hardness, hot hardness and back tack of the aqueous nano silica coating prepared in example 7 are also affected by the added aqueous acrylic resin, and the hardness, hot hardness and back tack are all inferior to those of example 1.

The glossiness, hardness, hot hardness and back tack of the aqueous nano-silica coating of the invention are also affected by the types and amounts of the cooling agent, the adhesion promoter, the leveling agent, the defoamer and the neutralizing agent, and the glossiness, hardness, hot hardness and back tack of the aqueous nano-silica coatings prepared in examples 8 to 14 are all worse than those of example 1.

In example 15, CYMEL 303LF was added as the aqueous amino resin, and in example 17, CY-S01 was added as the aqueous nanosilica solution, the hardness of the prepared aqueous nanosilica coating was affected, and the hardness was reduced compared with the aqueous nanosilica coating prepared in example 1.

In example 16, the adhesive force and flexibility of the prepared aqueous nano silica coating are affected by adding AC-8254 as the aqueous acrylic resin, and the adhesive force and flexibility are reduced compared with those of the aqueous nano silica coating prepared in example 1.

The foregoing description is only an example to further illustrate the technical content of the present invention, so that the reader can easily understand the technical content, and the present invention is not limited to the above embodiments, and any technical extension or recreating made in accordance with the present invention is protected by the present invention.

Claims

1. The water-based nano silicon dioxide coating is characterized by comprising the following components in percentage by mass:

the aqueous nano silicon dioxide is provided by an aqueous nano silicon dioxide solution, and the solute of the aqueous nano silicon dioxide solution is grafted- (CH) on silicon dioxide molecules ₂ ) _n Molecules of OH reactive groups, wherein n=3, 4 or 5, and the mass percentage of active hydroxyl groups in the solute is 2.5% -3.5%;

the water-based acrylic resin is formed by copolymerizing acrylic acid esters, methacrylic acid esters and other olefinic monomers, wherein the mass percentage of hydroxyl in the water-based acrylic resin is 3.0% -3.5%;

the aqueous amino resin is methyl etherified high imino melamine resin.

2. The aqueous nanosilica coating of claim 1, wherein the neutralizing agent is N, N-dimethylethanolamine.

3. The aqueous nanosilica coating of claim 1, wherein the temperature reducing agent is a blocked acid catalyst.

4. The aqueous nanosilica coating of claim 1, wherein the adhesion promoter is an aryl phosphate adhesion promoter or an alkyl phosphate adhesion promoter.

5. The aqueous nanosilica coating of claim 1, wherein the leveling agent is a siloxane-based leveling agent, a polyester leveling agent, or an alkyl vinyl ether copolymer leveling agent.

6. The aqueous nano-silica coating according to claim 1, wherein the defoamer is an organosilicon defoamer.

7. A method of using the aqueous nanosilica coating of any one of claims 1 to 6, comprising the steps of: