Thermal insulation inorganic coating based on chemical bond connection, preparation method and application

Abstract

The invention relates to the technical field of inorganic coatings, and discloses a thermal insulation inorganic coating based on chemical bond connection as well as a preparation method and application thereof, and the preparation method comprises the following steps: fully dispersing the following raw materials in parts by weight: 100-500 parts of an aerogel-filler bond connection material, 100-400 parts of silicate, 20-50 parts of a sol tackifier and a solvent to obtain dispersed dispersion liquid; adding 10-50 parts by weight of cellulose, 5-20 parts by weight of rare earth zirconate, 4-13 parts by weight of an auxiliary agent and a solvent into the dispersion liquid, and continuously and fully dispersing to obtain the required coating; wherein the weight part of the solvent is 200 to 500 parts; the aerogel-filler bond connection material is obtained by bonding amino-modified aerogel and aldehyde-modified filler through a bond; the obtained coating has the advantages of strong cohesiveness with a base material, low heat conductivity coefficient which can reach 0.038 W / m.K at the minimum, and good environmental protection property.

Description

Technical Field

[0001] The present invention relates to the technical field of inorganic coatings, and in particular to a thermal insulation inorganic coating based on chemical bond connection, a preparation method and application thereof. Background Art

[0002] Currently, most of the existing coatings are organic-inorganic composites, and 5-12% of organic synthetic resin emulsions are added. Organic synthetic resin emulsions account for a large part of the water-based coatings. Organic synthetic resin emulsions themselves have poor fire resistance, poor air permeability, and high VOC content. As people's environmental awareness gradually increases, they not only pursue material needs, but also have a stronger demand for healthy and green life. Since the water-based inorganic coatings on the market contain some organic synthetic resin emulsions, their VOCs cannot be completely removed.

[0003] At present, there are some studies on environmentally friendly inorganic coatings, but the existing inorganic coatings have the problems of high thermal conductivity and low bonding strength. For example, the publication number is CN115851010A, an inorganic coating and its preparation method and application, including: 50-90 parts of alkali metal silicate, 100-180 parts of inorganic oxide nanosol, 80-150 parts of emulsion, 150-250 parts of aerogel aqueous slurry and 3-5 parts of short fibers; the mass ratio of the alkali metal silicate and the inorganic oxide nanosol is (0.3-0.6): 1; the short fibers are wood fibers. Although the thermal conductivity and bonding strength have been improved to a certain extent, they are not very ideal. Therefore, preparing an inorganic coating with good bonding strength, low thermal conductivity and environmental protection is an important research direction in this field. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a thermal insulation inorganic coating based on chemical bond connection, a preparation method and application.

[0005] The technical solution adopted by the present invention is:

[0006] A method for preparing a thermal insulation inorganic coating based on chemical bond connection comprises the following steps:

[0007] Fully dispersing 100 to 500 parts by weight of a raw aerogel-filler bonding material, 100 to 400 parts by weight of a silicate, 20 to 50 parts by weight of a sol thickener, and a solvent to obtain a dispersed liquid;

[0008] Add 10 to 50 parts by weight of raw cellulose, 5 to 20 parts by weight of rare earth zirconate, 4 to 13 parts by weight of an auxiliary agent and a solvent into the dispersion liquid and continue to fully disperse to obtain the desired coating;

[0009] The solvent is 200 to 500 parts by weight;

[0010] The aerogel-filler bonding material is obtained by bonding an amino-modified aerogel and an aldehyde-modified filler.

[0011] Furthermore, the aerogel-filler bonding material preparation process is as follows:

[0012] Adding the amino-modified aerogel and the aldehyde-modified filler into a solvent, and reflux reacting for 6 to 24 hours;

[0013] Sodium borohydride is added, reacted for 4 to 10 hours, and the product is filtered, washed, and dried to obtain an aerogel-filler bond connection material;

[0014] The molar ratio of the amino-modified aerogel to the aldehyde-modified filler is 1:1; and the mass ratio of the amino-modified aerogel to sodium borohydride is 1:3.

[0015] Furthermore, the preparation process of the amino-modified aerogel is as follows:

[0016] Add aerogel and aminosilane coupling agent into solvent and react at 60°C for 3 to 12 hours;

[0017] After sufficient reaction, the product is filtered and dried to obtain amino-modified aerogel.

[0018] Furthermore, the preparation process of the aldehyde-modified filler is as follows:

[0019] Add filler and aminosilane coupling agent into solvent and react at 60°C for 3 to 12 hours;

[0020] Add flexible long-chain dialdehyde and react at room temperature for 2 to 8 hours. After filtering and drying the product, an aldehyde-modified filler can be obtained.

[0021] Furthermore, the aerogel is one or two or more of silicon dioxide aerogel, zirconium dioxide aerogel and aluminum oxide aerogel mixed in any proportion;

[0022] The aminosilane coupling agent is one or a mixture of two or more of 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropylmethyldimethoxysilane and 3-aminopropylmethyldiethoxysilane in any proportion.

[0023] Furthermore, the filler is a mixture of two or more of titanium dioxide, heavy calcium, attapulgite, and silica powder in any proportion;

[0024] The aminosilane coupling agent is one or a mixture of two or more of 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropylmethyldimethoxysilane and 3-aminopropylmethyldiethoxysilane in any proportion;

[0025] The flexible long-chain diol is a terminal dibasic fatty aldehyde having 4 to 12 carbon atoms.

[0026] A thermal insulation inorganic coating based on chemical bond connection, comprising, by weight:

[0027] 100-500 parts of aerogel-filler bonding material, 100-400 parts of silicate, 20-50 parts of sol thickener, 10-50 parts of cellulose, 5-20 parts of rare earth zirconate, 4-13 parts of auxiliary agent, and 200-500 parts of solvent;

[0028] The aerogel-filler bonding material is obtained by bonding an amino-modified aerogel and an aldehyde-modified filler.

[0029] Furthermore, the silicate is one of potassium silicate, sodium silicate and lithium silicate, or a mixture of two or more of the above in any proportion.

[0030] Furthermore, the cellulose is one or two or more of hydroxyethyl cellulose, hydroxypropyl cellulose, and methyl cellulose mixed in any proportion; the rare earth zirconate is one or two or more of lanthanum zirconate, yttrium zirconate, gadolinium zirconate, and lanthanum cerium zirconate mixed in any proportion.

[0031] An application of a thermal insulation inorganic coating based on chemical bond connection, wherein the thermal insulation inorganic coating based on chemical bond connection is used for preparing a thermal insulation inorganic coating.

[0032] The beneficial effects of the present invention are:

[0033] (1) The aerogel component and the filler component in the present invention form a stable CN covalent bond through a reduction Schiff base reaction, thereby achieving chemical bonding and enhancing the interaction between the inorganic components to form an aerogel-filler bond connection material;

[0034] (2) The flexible long chains between the aerogel component and the filler component in the aerogel-filler bonded material of the present invention can be "woven" into the Si-O-Si network structure formed when the silicate is formed into a film, further enhancing the interaction between the components, achieving the purpose of no powdering, difficult to fall off, and no need to add organic resin emulsion;

[0035] (3) The rare earth zirconate in the present invention is used as a heat insulation effect regulator, which can effectively improve the high temperature resistance and corrosion resistance of the coating;

[0036] (4) The coating provided in the present invention has the advantages of being free of VOCs, having good thermal insulation effect, being flame retardant and fire resistant, and meets the requirements of safety, environmental protection, energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the structure of the aerogel-filler bond connection material in the present invention. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0039] A method for preparing a thermal insulation inorganic coating based on chemical bond connection comprises the following steps:

[0040] Fully dispersing 100 to 500 parts by weight of a raw aerogel-filler bonding material, 100 to 400 parts by weight of a silicate, 20 to 50 parts by weight of a sol thickener, and a solvent to obtain a dispersed liquid;

[0041] Add 10 to 50 parts by weight of raw cellulose, 5 to 20 parts by weight of rare earth zirconate, 4 to 13 parts by weight of an auxiliary agent and a solvent into the dispersion liquid and continue to fully disperse to obtain the desired coating;

[0042] The solvent is 200 to 500 parts by weight and is water.

[0043] like Figure 1 As shown, the aerogel-filler bonding material is obtained by bonding an amino-modified aerogel and an aldehyde-modified filler.

[0044] The preparation process of aerogel-filler bond material is as follows:

[0045] Adding the amino-modified aerogel and the aldehyde-modified filler into a solvent, and reflux reacting for 6 to 24 hours;

[0046] Sodium borohydride is added, reacted for 4 to 10 hours, and the product is filtered, washed, and dried to obtain an aerogel-filler bond connection material;

[0047] The molar ratio of amino-modified aerogel to aldehyde-modified filler is 1:1, and the mass ratio of amino-modified aerogel to sodium borohydride is 1:3. The filler is a mixture of two or more of titanium dioxide, heavy calcium, attapulgite, and silica powder in any proportion.

[0048] The preparation process of amino-modified aerogel is as follows:

[0049] Add aerogel and aminosilane coupling agent into solvent and react at 60°C for 3 to 12 hours;

[0050] After sufficient reaction, the product is filtered and dried to obtain amino-modified aerogel.

[0051] The preparation process of aldehyde-modified fillers is as follows:

[0052] Add filler and aminosilane coupling agent into solvent and react at 60°C for 3 to 12 hours;

[0053] Add flexible long-chain dialdehyde and react at room temperature for 2 to 8 hours. After filtering and drying the product, an aldehyde-modified filler can be obtained.

[0054] Aerogel is composed of one or two or more of silicon dioxide, zirconium dioxide and aluminum oxide mixed in any proportion;

[0055] The aminosilane coupling agent is one or a mixture of two or more of 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropylmethyldimethoxysilane and 3-aminopropylmethyldiethoxysilane in any proportion.

[0056] The aminosilane coupling agent is one or a mixture of two or more of 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropylmethyldimethoxysilane and 3-aminopropylmethyldiethoxysilane in any proportion;

[0057] The flexible long-chain diol is a terminal dibasic fatty aldehyde having 4 to 12 carbon atoms.

[0058] A thermal insulation inorganic coating based on chemical bond connection, comprising, by weight:

[0059] The invention comprises 100 to 500 parts of aerogel-filler bonding material, 100 to 400 parts of silicate, 20 to 50 parts of sol thickener, 10 to 50 parts of cellulose, 5 to 20 parts of rare earth zirconate, 4 to 13 parts of auxiliary agent and 200 to 500 parts of solvent; the solvent is water.

[0060] The sol thickener can be selected from existing products, such as Evonik Degussa SIVO 112, Evonik Degussa SIVO 113, etc. The additives are dispersants and defoamers, wherein the dispersant is 3 to 10 parts by weight and the defoamer is 1 to 3 parts by weight. The dispersant can be an existing product, such as Nouryon Alcosperse 747, Nouryon Alcosperse 797, etc.; the defoamer can be an existing product, such as BASF FoamStar-SI 2293, BASF FoamStar-SI 2299, etc.

[0061] The aerogel-filler bonding material is obtained by bonding an amino-modified aerogel and an aldehyde-modified filler.

[0062] Silicate is composed of one or two or more of potassium silicate, sodium silicate and lithium silicate in any proportion. Cellulose is composed of one or two or more of hydroxyethyl cellulose, hydroxypropyl cellulose and methyl cellulose in any proportion; rare earth zirconate is composed of one or two or more of lanthanum zirconate, yttrium zirconate, gadolinium zirconate and lanthanum cerium zirconate in any proportion.

[0063] Example 1

[0064] Follow the steps below to prepare thermal insulation inorganic coatings based on chemical bonding:

[0065] First, prepare the amino-modified aerogel:

[0066] 5 parts by mass of silica aerogel and 1 part by mass of 3-aminopropyltriethoxysilane were added to 30 parts by mass of 90% ethanol aqueous solution, and reacted at 60° C. for 6 hours;

[0067] After sufficient reaction, the product is filtered and dried to obtain amino-modified silica aerogel.

[0068] Then prepare the aldehyde-modified filler:

[0069] A filler consisting of 3 parts by mass of titanium dioxide and 2 parts by mass of heavy calcium was added to 30 parts by mass of a 90% ethanol aqueous solution containing 1 part by mass of 3-aminopropyltriethoxysilane, and reacted at 60° C. for 6 hours.

[0070] 2 parts by mass of glutaraldehyde were added, reacted at room temperature for 3 hours, the product was filtered and dried naturally to obtain an aldehyde-modified filler.

[0071] Preparation of aerogel-filler bonding materials:

[0072] Add the amino-modified silica aerogel and the aldehyde-modified filler into anhydrous ethanol and stir and reflux for 12 hours;

[0073] After cooling to room temperature, sodium borohydride was added, reacted for 6 hours, and the product was filtered; after washing, it was vacuum dried at 80°C for 3 hours to obtain an aerogel-filler bonded material, wherein the molar ratio of amino-modified silica aerogel to aldehyde-modified filler was 1:1, and the mass ratio of amino-modified silica aerogel to sodium borohydride was 1:3.

[0074] Weigh each raw material according to the following mass parts:

[0075] 300 parts of aerogel-filler bonding material, 150 parts of silicate, Evonik Degussa 35 parts of SIVO 112 sol thickener were added to 380 parts of water and dispersed at high speed for 20 minutes to obtain a dispersion.

[0076] 20 parts of hydroxyethyl cellulose, 12 parts of lanthanum zirconate, 6 parts of Nouryon Alcosperse 747 dispersant, and 2 parts of BASF FoamStar-SI 2293 defoamer were added to the dispersion, and high-speed dispersion was continued for 30 minutes. After grinding, a chemically bonded thermal insulation inorganic coating was obtained.

[0077] Example 2

[0078] Follow the steps below to prepare thermal insulation inorganic coatings based on chemical bonding:

[0079] First, prepare the amino-modified aerogel:

[0080] 5 parts by mass of zirconium dioxide aerogel and 1 part by mass of 3-aminopropylmethyldimethoxysilane were added to 30 parts by mass of 90% ethanol aqueous solution, and reacted at 60° C. for 6 hours;

[0081] After sufficient reaction, the product is filtered and dried to obtain amino-modified zirconium dioxide aerogel.

[0082] Then prepare the aldehyde-modified filler:

[0083] A filler consisting of 3 parts by mass of titanium dioxide and 2 parts by mass of heavy calcium was added to 30 parts by mass of a 90% ethanol aqueous solution containing 1 part by mass of 3-aminopropylmethyldimethoxysilane, and reacted at 60° C. for 6 hours.

[0084] 2 parts by mass of succinaldehyde were added, reacted at room temperature for 3 hours, the product was filtered and dried naturally to obtain an aldehyde-modified filler.

[0085] Preparation of aerogel-filler bonding materials:

[0086] The amino-modified zirconium dioxide aerogel and the aldehyde-modified filler were added into anhydrous ethanol and stirred and refluxed for 12 hours;

[0087] After cooling to room temperature, sodium borohydride was added, reacted for 6 hours, and the product was filtered; after washing, it was vacuum dried at 80°C for 3 hours to obtain an aerogel-filler bonded material, wherein the molar ratio of amino-modified silica aerogel to aldehyde-modified filler was 1:1, and the mass ratio of amino-modified silica aerogel to sodium borohydride was 1:3.

[0088] Weigh each raw material according to the following mass parts:

[0089] 300 parts of aerogel-filler bonding material, 150 parts of silicate, Evonik Degussa 35 parts of SIVO 112 sol thickener were added to 380 parts of water and dispersed at high speed for 20 minutes to obtain a dispersion.

[0090] Add 20 parts of hydroxypropyl cellulose, 12 parts of yttrium zirconate, 6 parts of Nouryon Alcosperse 797 dispersant, and 2 parts of BASF FoamStar-SI 2299 defoamer to the dispersion, continue to disperse at high speed for 30 minutes, and obtain a chemically bonded thermal insulation inorganic coating after grinding.

[0091] Example 3

[0092] Follow the steps below to prepare thermal insulation inorganic coatings based on chemical bonding:

[0093] First, prepare the amino-modified aerogel:

[0094] 5 parts by mass of silica aerogel and 1 part by mass of 3-aminopropyltriethoxysilane were added to 30 parts by mass of 90% ethanol aqueous solution, and reacted at 60° C. for 12 hours;

[0095] After sufficient reaction, the product is filtered and dried to obtain amino-modified silica aerogel.

[0096] Then prepare the aldehyde-modified filler:

[0097] A filler consisting of 3 parts by mass of titanium dioxide and 2 parts by mass of attapulgite was added to 30 parts by mass of a 90% ethanol aqueous solution containing 1 part by mass of 3-aminopropyltriethoxysilane, and reacted at 60° C. for 3 hours.

[0098] 2 parts by mass of glutaraldehyde were added, reacted at room temperature for 8 hours, the product was filtered and dried naturally to obtain an aldehyde-modified filler.

[0099] Preparation of aerogel-filler bonding materials:

[0100] Add the amino-modified silica aerogel and the aldehyde-modified filler into anhydrous ethanol and stir and reflux for 24 hours;

[0101] After cooling to room temperature, sodium borohydride was added, reacted for 4 hours, and the product was filtered; after washing, it was vacuum dried at 80°C for 3 hours to obtain an aerogel-filler bonded material, wherein the molar ratio of amino-modified silica aerogel to aldehyde-modified filler was 1:1, and the mass ratio of amino-modified silica aerogel to sodium borohydride was 1:3.

[0102] Weigh each raw material according to the following mass parts:

[0103] 300 parts of aerogel-filler bonding material, 150 parts of silicate, Evonik Degussa 35 parts of SIVO 112 sol thickener were added to 380 parts of water and dispersed at high speed for 30 minutes to obtain a dispersion.

[0104] Add 20 parts of methyl cellulose, 12 parts of gadolinium zirconate, 6 parts of Nouryon Alcosperse 747 dispersant, and 2 parts of BASF FoamStar-SI 2293 defoamer to the dispersion, continue to disperse at high speed for 20 minutes, and grind to obtain a chemically bonded thermal insulation inorganic coating.

[0105] Example 4

[0106] Follow the steps below to prepare thermal insulation inorganic coatings based on chemical bonding:

[0107] First, prepare the amino-modified aerogel:

[0108] 5 parts by mass of silica aerogel and 1 part by mass of 3-aminopropylmethyldimethoxysilane were added to 30 parts by mass of 90% ethanol aqueous solution, and reacted at 60° C. for 3 hours;

[0109] After sufficient reaction, the product is filtered and dried to obtain amino-modified silica aerogel.

[0110] Then prepare the aldehyde-modified filler:

[0111] A filler consisting of 3 parts by mass of titanium dioxide and 2 parts by mass of heavy calcium was added to 30 parts by mass of a 90% ethanol aqueous solution containing 1 part by mass of 3-aminopropylmethyldimethoxysilane, and reacted at 60° C. for 12 hours.

[0112] 2 parts by mass of glutaraldehyde were added, reacted at room temperature for 2 hours, the product was filtered and dried naturally to obtain an aldehyde-modified filler.

[0113] Preparation of aerogel-filler bonding materials:

[0114] Add the amino-modified silica aerogel and the aldehyde-modified filler into anhydrous ethanol and stir and reflux for 6 hours;

[0115] After cooling to room temperature, sodium borohydride was added, reacted for 10 hours, and the product was filtered; after washing, it was vacuum dried at 80°C for 3 hours to obtain an aerogel-filler bonded material, wherein the molar ratio of amino-modified silica aerogel to aldehyde-modified filler was 1:1, and the mass ratio of amino-modified silica aerogel to sodium borohydride was 1:3.

[0116] Weigh each raw material according to the following mass parts:

[0117] 300 parts of aerogel-filler bonding material, 150 parts of silicate, Evonik Degussa 35 parts of SIVO 112 sol thickener were added to 380 parts of water and dispersed at high speed for 10 minutes to obtain a dispersion.

[0118] Add 20 parts of hydroxyethyl cellulose, 12 parts of lanthanum zirconate, 6 parts of Nouryon Alcosperse 747 dispersant, and 2 parts of BASF FoamStar-SI 2293 defoamer to the dispersion, continue to disperse at high speed for 10 minutes, and grind to obtain a chemically bonded thermal insulation inorganic coating.

[0119] Example 5

[0120] Follow the steps below to prepare thermal insulation inorganic coatings based on chemical bonding:

[0121] First, prepare the amino-modified aerogel:

[0122] 5 parts by mass of silica aerogel and 1 part by mass of 3-aminopropyltriethoxysilane were added to 30 parts by mass of 90% ethanol aqueous solution, and reacted at 60° C. for 6 hours;

[0123] After sufficient reaction, the product is filtered and dried to obtain amino-modified silica aerogel.

[0124] Then prepare the aldehyde-modified filler:

[0125] A filler consisting of 3 parts by mass of titanium dioxide and 2 parts by mass of heavy calcium was added to 30 parts by mass of a 90% ethanol aqueous solution containing 1 part by mass of 3-aminopropyltriethoxysilane, and reacted at 60° C. for 6 hours.

[0126] 2 parts by mass of glutaraldehyde were added, reacted at room temperature for 3 hours, the product was filtered and dried naturally to obtain an aldehyde-modified filler.

[0127] Preparation of aerogel-filler bonding materials:

[0128] Add the amino-modified silica aerogel and the aldehyde-modified filler into anhydrous ethanol and stir and reflux for 12 hours;

[0129] After cooling to room temperature, sodium borohydride was added, reacted for 6 hours, and the product was filtered; after washing, it was vacuum dried at 80°C for 3 hours to obtain an aerogel-filler bonded material, wherein the molar ratio of amino-modified silica aerogel to aldehyde-modified filler was 1:1, and the mass ratio of amino-modified silica aerogel to sodium borohydride was 1:3.

[0130] Weigh each raw material according to the following mass parts:

[0131] 500 parts of aerogel-filler bonding material, 100 parts of silicate, Evonik Degussa 20 parts of SIVO 112 sol thickener were added to 500 parts of water and dispersed at high speed for 20 minutes to obtain a dispersion.

[0132] 50 parts of hydroxyethyl cellulose, 5 parts of lanthanum zirconate, 10 parts of Nouryon Alcosperse 747 dispersant, and 3 parts of BASF FoamStar-SI 2293 defoamer were added to the dispersion, and high-speed dispersion was continued for 30 minutes. After grinding, a chemically bonded thermal insulation inorganic coating was obtained.

[0133] Example 6

[0134] Follow the steps below to prepare thermal insulation inorganic coatings based on chemical bonding:

[0135] First, prepare the amino-modified aerogel:

[0136] 5 parts by mass of silica aerogel and 1 part by mass of 3-aminopropyltriethoxysilane were added to 30 parts by mass of 90% ethanol aqueous solution, and reacted at 60° C. for 6 hours;

[0137] After sufficient reaction, the product is filtered and dried to obtain amino-modified silica aerogel.

[0138] Then prepare the aldehyde-modified filler:

[0139] A filler consisting of 3 parts by mass of titanium dioxide and 2 parts by mass of heavy calcium was added to 30 parts by mass of a 90% ethanol aqueous solution containing 1 part by mass of 3-aminopropyltriethoxysilane, and reacted at 60° C. for 6 hours.

[0140] 2 parts by mass of glutaraldehyde were added, reacted at room temperature for 3 hours, the product was filtered and dried naturally to obtain an aldehyde-modified filler.

[0141] Preparation of aerogel-filler bonding materials:

[0142] Add the amino-modified silica aerogel and the aldehyde-modified filler into anhydrous ethanol and stir and reflux for 12 hours;

[0143] After cooling to room temperature, sodium borohydride was added, reacted for 6 hours, and the product was filtered; after washing, it was vacuum dried at 80°C for 3 hours to obtain an aerogel-filler bonded material, wherein the molar ratio of amino-modified silica aerogel to aldehyde-modified filler was 1:1, and the mass ratio of amino-modified silica aerogel to sodium borohydride was 1:3.

[0144] Weigh each raw material according to the following mass parts:

[0145] Aerogel-filler bonding material 100 parts, silicate 400 parts, Evonik Degussa 50 parts of SIVO 112 sol thickener were added to 200 parts of water and dispersed at high speed for 20 minutes to obtain a dispersion.

[0146] 10 parts of hydroxyethyl cellulose, 20 parts of lanthanum zirconate, 3 parts of Nouryon Alcosperse 747 dispersant, and 1 part of BASF FoamStar-SI 2293 defoamer were added to the dispersion, and high-speed dispersion was continued for 30 minutes. After grinding, a chemically bonded thermal insulation inorganic coating was obtained.

[0147] Comparative Example

[0148] Weigh each raw material according to the following mass parts:

[0149] 150 parts of silica aerogel, 90 parts of titanium dioxide, 60 parts of heavy calcium, 150 parts of silicate, Evonik Degussa 35 parts of SIVO 112 sol thickener were added to 380 parts of water and dispersed at high speed for 20 minutes to obtain a dispersion.

[0150] 20 parts of hydroxyethyl cellulose, 12 parts of lanthanum zirconate, 6 parts of Nouryon Alcosperse 747 dispersant, and 2 parts of BASF FoamStar-SI 2293 defoamer were added to the dispersion, and high-speed dispersion was continued for 30 minutes. The inorganic coating was obtained after grinding.

[0151] The coating prepared above was applied on the surface of the substrate, dried at room temperature for 3 days, and then the performance test was performed. The results are shown in Table 1. The method used to detect the thermal conductivity coefficient was GB / T10295-2008, and the water resistance (360h) test method was JG / T26-2002. The method used for washing resistance (times) was GB / T9266-2009, the TVOC (g / L) test method was GB18582-2020, and the free formaldehyde (g / L) test method was GB18582-2020.

[0152] Table 1. Performance test results

[0153]

[0154] The aerogel component and the filler component in the present invention form a stable CN covalent bond through a reduction Schiff base reaction, thereby achieving chemical bonding and enhancing the interaction between inorganic components to form an aerogel-filler bond connection material; the flexible long chains between the aerogel component and the filler component in the aerogel-filler bond connection material can be "woven" into the Si-O-Si network structure formed when the silicate is formed into a film, further enhancing the interaction between the components, achieving the purpose of no powdering, difficult to fall off, and no need to add an organic resin emulsion; rare earth zirconate can be used as a heat insulation effect regulator to effectively improve the high temperature resistance and corrosion resistance of the coating; the provided coating has the advantages of no VOCs, good heat preservation effect, flame retardancy and fire resistance, and meets the requirements of safety, environmental protection, energy saving and consumption reduction.

Claims

1. A method for preparing a thermal insulation inorganic coating based on chemical bond connection, characterized in that: The following steps are involved: Fully dispersing 100 to 500 parts by weight of a raw aerogel-filler bonding material, 100 to 400 parts by weight of a silicate, 20 to 50 parts by weight of a sol thickener, and a solvent to obtain a dispersed liquid; Adding 10 to 50 parts by weight of raw cellulose, 5 to 20 parts by weight of rare earth zirconate, 4 to 13 parts by weight of an auxiliary agent and a solvent into the dispersion and continuing to fully disperse to obtain the desired coating; The solvent is 200 to 500 parts by weight; The aerogel-filler bond connection material is obtained by bonding an amino-modified aerogel and an aldehyde-modified filler.

2. The method for preparing a thermal insulation inorganic coating based on chemical bond connection according to claim 1, characterized in that: The aerogel-filler bond material preparation process is as follows: Adding amino-modified aerogel and aldehyde-modified filler into a solvent and reflux reaction for 6 to 24 hours; Sodium borohydride is added and reacted for 4 to 10 hours. The product is filtered, washed, and dried to obtain an aerogel-filler bonded material. The molar ratio of the amino-modified aerogel and the aldehyde-modified filler is 1:1; and the mass ratio of the amino-modified aerogel and sodium borohydride is 1:

3.

3. The method for preparing a thermal insulation inorganic coating based on chemical bond connection according to claim 2, characterized in that: The preparation process of the amino-modified aerogel is as follows: Add aerogel and aminosilane coupling agent into solvent and react at 60°C for 3 to 12 hours; After sufficient reaction, the product is filtered and dried to obtain amino-modified aerogel.

4. The method for preparing a thermal insulation inorganic coating based on chemical bond connection according to claim 2, characterized in that: The preparation process of the aldehyde-modified filler is as follows: Add filler and aminosilane coupling agent to solvent and react at 60°C for 3 to 12 hours; Add flexible long-chain dialdehyde and react at room temperature for 2 to 8 hours. After filtering and drying the product, an aldehyde-modified filler can be obtained.

5. The method for preparing a thermal insulation inorganic coating based on chemical bond connection according to claim 3, characterized in that: The aerogel is composed of one or two or more of silicon dioxide aerogel, zirconium dioxide aerogel and aluminum oxide aerogel in any proportion; The aminosilane coupling agent is composed of one or a mixture of two or more of 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropylmethyldimethoxysilane and 3-aminopropylmethyldiethoxysilane in any proportion.

6. The method for preparing a thermal insulation inorganic coating based on chemical bond connection according to claim 4, characterized in that: The filler is a mixture of two or more of titanium dioxide, heavy calcium carbonate, attapulgite, and silica powder in any proportion; The aminosilane coupling agent is composed of one or a mixture of two or more of 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropylmethyldimethoxysilane and 3-aminopropylmethyldiethoxysilane in any proportion; The flexible long-chain diol is a terminal dibasic fatty aldehyde having 4 to 12 carbon atoms.

7. The thermal insulation inorganic coating based on chemical bond connection obtained by any one of the preparation methods of claims 1 to 6, characterized in that: In terms of parts by mass, it includes: 100-500 parts of aerogel-filler bonding material, 100-400 parts of silicate, 20-50 parts of sol thickener, 10-50 parts of cellulose, 5-20 parts of rare earth zirconate, 4-13 parts of auxiliary agent, and 200-500 parts of solvent; The aerogel-filler bonding material is obtained by bonding an amino-modified aerogel and an aldehyde-modified filler.

8. The thermal insulation inorganic coating based on chemical bond connection according to claim 7, characterized in that: The silicate is one of potassium silicate, sodium silicate and lithium silicate, or a mixture of two or more of the above in any proportion.

9. The thermal insulation inorganic coating based on chemical bond connection according to claim 7, characterized in that: The cellulose is one or two or more of hydroxyethyl cellulose, hydroxypropyl cellulose, and methyl cellulose mixed in any proportion; the rare earth zirconate is one or two or more of lanthanum zirconate, yttrium zirconate, gadolinium zirconate, and lanthanum cerium zirconate mixed in any proportion.

10. The use of the thermal insulation inorganic coating based on chemical bond connection according to any one of claims 7 to 9, characterized in that: The thermal insulation inorganic paint based on chemical bond connection is used to prepare a thermal insulation inorganic coating.

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