Anti-carbonization coating and preparation method thereof

Abstract

The invention provides an anti-carbonization coating and a preparation method thereof, and relates to the field of coatings. The anti-carbonization coating is prepared from the following components in parts by weight: 32 to 38 parts of vinyl ester resin, 6 to 8 parts of rutile titanium dioxide, 8 to 12 parts of glass flake, 3 to 6 parts of mica powder, 1 to 3 parts of nano zirconium dioxide, 2 to 3 parts of nano silicon dioxide, 1 to 3 parts of modified boron nitride nano powder, 5 to 8 parts of styrene, 1 to 2 parts of methyl ethyl ketone peroxide and 1 to 2 parts of functional additive, according to the anti-carbonization coating provided by the invention, the sheet structures of the used glass flakes and boron nitride are synergistic, a permeation path is prolonged, the glass flakes and the boron nitride are jointly dispersed in resin, stress is absorbed through interlayer slippage, and crack propagation of a coating is reduced; under the combined action of gamma-aminopropyltriethoxysilane and octadecyltrimethoxysilane, dual functional modification is given to the boron nitride nanosheets, covalent bonds or hydrogen bonds are formed by the boron nitride nanosheets and polar groups in vinyl ester resin through chemical bonding, and the interface bonding force between filler and a matrix is enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of paint, in particular to a carbonation-proof paint and a preparation method thereof. BACKGROUND

[0002] Concrete carbonation refers to the chemical reaction between carbon dioxide in the air and calcium hydroxide, a hydration product of cement in concrete, to form calcium carbonate and water, which leads to the decrease of alkalinity of concrete.

[0003] Concrete carbonation easily leads to the failure of the steel bar protective layer and causes corrosion. Although calcium carbonate generated by the carbonation reaction is insoluble in water, it can destroy the alkaline medium inside the concrete, dissolve the passivation film on the surface of the steel bar, and expose the steel bar to rapid oxidation and corrosion in a humid environment, resulting in internal stress, cracking, peeling and even structural damage of the concrete. At the same time, carbonation can reduce the compressive strength and impermeability of concrete, weaken the microstructure density, and accelerate the penetration of harmful substances such as chloride ions and sulfates.

[0004] Therefore, it is necessary to provide a new carbonation-proof paint and a preparation method thereof to solve the above technical problems. SUMMARY

[0005] To solve the above technical problems, the present application provides a carbonation-proof paint and a preparation method thereof.

[0006] The carbonation-proof paint provided by the present application comprises the following components by weight:

[0007] 32-38 parts of vinyl ester resin, 6-8 parts of rutile titanium dioxide, 8-12 parts of glass flake, 3-6 parts of mica powder, 1-3 parts of nano zirconium dioxide, 2-3 parts of nano silicon dioxide, 1-3 parts of modified boron nitride nano powder, 5-8 parts of styrene, 1-2 parts of methyl ethyl ketone peroxide, and 1-2 parts of functional additives;

[0008] The preparation method of the modified boron nitride nano powder is as follows: a mixed solution of ethanol and deionized water is prepared, the pH is adjusted to 4-5, γ-aminopropyl triethoxysilane and octadecyl trimethoxysilane are added while stirring, the mixture is stirred uniformly, hexagonal boron nitride powder and nano zinc oxide are added, a pre-dispersed suspension is obtained, the pre-dispersed suspension is placed in an ice water bath, ultrasonic treatment is performed, condensation reflux is performed, the precipitate is collected by centrifugation, the precipitate is redispersed in a mixed solution of anhydrous ethanol and deionized water, centrifugation is performed again, the process is repeated for 3-6 times, modified boron nitride nano sheet precipitate is obtained, the modified boron nitride nano sheet precipitate is dispersed in ethanol, and dried for 12-18 hours to obtain the modified boron nitride nano powder.

[0009] Preferably, the following components by weight are included:

[0010] Vinyl ester resin 35 parts, rutile titanium dioxide 7 parts, glass flake 10 parts, mica powder 4.5 parts, nano zirconium dioxide 2 parts, nano silicon dioxide 2.5 parts, modified boron nitride nano powder 2 parts, styrene 6.5 parts, methyl ethyl ketone peroxide 1.5 parts and functional additives 1.5 parts.

[0011] Preferably, the functional additives include defoamers and ultraviolet absorbers.

[0012] Preferably, the weight of each component in the preparation method of the modified boron nitride nano powder is as follows: ethanol 150-200 parts, γ-aminopropyl triethoxysilane 3-4 parts, octadecyl trimethoxysilane 3-4 parts, hexagonal boron nitride powder 60-80 parts, nano zinc oxide 2-2.8 parts.

[0013] Preferably, a mixture of ethanol and deionized water is configured, and when adjusting the pH, ice acetic acid is used for adjustment.

[0014] A preparation method of a carbonization-resistant coating, prepared according to the carbonization-resistant coating described above, comprising the following preparation steps:

[0015] S1: weigh each component according to the proportion;

[0016] S2: add the modified boron nitride nano powder to the deionized water, ultrasonically disperse for 30-45 min, and prepare a boron nitride suspension;

[0017] S3: mix the vinyl ester resin, styrene and methyl ethyl ketone peroxide, stir uniformly, and then add the rutile titanium dioxide, glass flake, mica powder, nano zirconium dioxide and nano silicon dioxide, mix uniformly, and obtain a mixed solution;

[0018] S4: heat the mixed solution to 50-62℃, add the boron nitride suspension, ultrasonically disperse for 10-25 min, continue to heat to 65-75℃, then add the functional additives, and stir at low speed (180-200 rpm) for 10 min until mixed uniformly, and obtain a primary coating;

[0019] S5: age the primary coating, and filter through a filter screen to obtain a finished coating.

[0020] Preferably, the vinyl ester resin, styrene and methyl ethyl ketone peroxide are mixed, and when stirring, forward and reverse intermittent stirring is adopted, wherein clockwise stirring is performed for 3 min at a speed of 300-400 rpm, static for 3 min, and then counterclockwise stirring is performed for 3 min at a speed of 450-550 rpm.

[0021] Preferably, the filter screen is 200 mesh.

[0022] Preferably, the aging of the primary coating comprises the following steps:

[0023] S701: Put the primary coating in a closed container, and low-speed stirring at 55℃, 60rpm for 30min;

[0024] S702: Stop stirring, open the vacuum system, and reduce the pressure to-0.095MPa, and maintain for 30-45min for vacuum defoaming;

[0025] S703: Release the vacuum, and discharge the coating, and stand for 10-12h at 25℃.

[0026] Compared with the related art, the anti-carbonization coating and the preparation method thereof have the following beneficial effects:

[0027] 1. The glass flake and the boron nitride are used in the application, and the penetration path is prolonged through the synergistic effect of the flaky structure of the glass flake and the boron nitride, both of which are dispersed in the resin, and the stress is absorbed through interlayer sliding to reduce the crack propagation of the coating, the modified boron nitride nanosheet has an ultrathin flaky structure, and after modification by γ-aminopropyl triethoxysilane and octadecyl trimethoxysilane, hydrophilic groups (-NH2, -OH) and hydrophobic groups (-CH3) are introduced on the surface, thereby enhancing the interfacial bonding force with the resin.

[0028] 2. The glass flake has a wide temperature resistance range and a low thermal expansion coefficient, which can reduce the thermal stress cracking of the coating caused by temperature difference, the boron nitride has high thermal conductivity, which is beneficial to the uniform distribution of heat during the curing process of the coating, avoids the degradation of the resin caused by local overheating, and the layered structure can also inhibit the heat transfer direction and reduce heat accumulation, thereby improving the weather resistance of the coating.

[0029] 3. The boron nitride is modified in the application, and the γ-aminopropyl triethoxysilane and octadecyl trimethoxysilane jointly modify the boron nitride nanosheet, form covalent bonds or hydrogen bonds with the polar groups in the vinyl ester resin through chemical bonding, enhance the interfacial bonding force between the filler and the matrix, and after modification, the boron nitride nanosheet forms a uniform two-dimensional sheet structure in the coating, reduces the agglomeration pores, and thereby builds a more dense physical barrier, in addition, nano-zinc oxide is used in the modification process, which reduces the degradation of the coating matrix by ultraviolet light and delays the carbonization risk caused by aging. DETAILED DESCRIPTION

[0030] The application will be further described below in combination with the embodiments.

[0031] In the specific implementation process:

[0032] An anti-carbonization coating comprises the following components by weight:

[0033] Vinyl ester resin 32-38 parts, rutile titanium dioxide 6-8 parts, glass flake 8-12 parts, mica powder 3-6 parts, nano zirconium dioxide 1-3 parts, nano silicon dioxide 2-3 parts, modified boron nitride nano powder 1-3 parts, styrene 5-8 parts, methyl ethyl ketone peroxide 1-2 parts and functional additives 1-2 parts;

[0034] The preparation method of the modified boron nitride nano powder is: configuring a mixed solution of ethanol and deionized water, adjusting the pH to 4-5 using glacial acetic acid, adding γ-aminopropyl triethoxysilane and octadecyl trimethoxysilane while stirring, stirring uniformly, adding hexagonal boron nitride powder and nano zinc oxide, obtaining a pre-dispersed suspension, placing the pre-dispersed suspension in an ice water bath, ultrasonic treatment, condensation reflux, centrifugal collection of the precipitate, redispersion of the precipitate with a mixed solution of anhydrous ethanol and deionized water, centrifugation again, repeating 3-6 times, obtaining modified boron nitride nano sheet precipitate, dispersing the modified boron nitride nano sheet precipitate in ethanol, drying for 12-18 hours to obtain the modified boron nitride nano powder, and the weight amount of each component in the preparation method of the modified boron nitride nano powder is: ethanol 150-200 parts, γ-aminopropyl triethoxysilane 3-4 parts, octadecyl trimethoxysilane 3-4 parts, hexagonal boron nitride powder 60-80 parts, and nano zinc oxide 2-2.8 parts;

[0035] The functional additives include defoaming agents and ultraviolet absorbers;

[0036] A preparation method of a carbonization-resistant coating, prepared according to the carbonization-resistant coating described above, includes the following preparation steps:

[0037] S1: weighing each component by proportion;

[0038] S2: adding the modified boron nitride nano powder into deionized water, ultrasonic dispersion (500W) for 30-45min to prepare a boron nitride suspension;

[0039] S3: mixing the vinyl ester resin, styrene and methyl ethyl ketone peroxide, stirring uniformly, using forward and reverse intermittent stirring during stirring, clockwise stirring for 3min at a speed of 300-400rpm, static for 3min, then counterclockwise stirring for 3min at a speed of 450-550rpm, sequentially adding rutile titanium dioxide, glass flake, mica powder, nano zirconium dioxide and nano silicon dioxide, mixing uniformly to obtain a mixed solution;

[0040] S4: heating the mixed solution to 50-62℃, adding the boron nitride suspension, ultrasonic dispersion for 10-25min, continuing to heat to 65-75℃, then adding the functional additives, low-speed stirring (180-200rpm) for 10min until mixing is uniform to obtain a primary coating;

[0041] S5: aging the primary coating, filtering the finished coating using a 200 mesh filter;

[0042] The aging of the primary coating comprises the following steps:

[0043] S701: placing the primary coating in a sealed container, and stirring at a low speed of 55℃ and 60rpm for 30min;

[0044] S702: stopping the stirring, starting the vacuum system, and reducing the pressure to -0.095MPa for 30-45min for vacuum defoaming;

[0045] S703: releasing the vacuum, and discharging the coating for standing aging at 25℃ for 10-12h.

[0046] Example One

[0047] A carbonization-resistant coating, comprising the following components by weight:

[0048] 32 parts of vinyl ester resin, 6 parts of rutile titanium dioxide, 8 parts of glass flake, 3 parts of mica powder, 1 part of nano zirconium dioxide, 2 parts of nano silicon dioxide, 1 part of modified boron nitride nano powder, 5 parts of styrene, 1 part of methyl ethyl ketone peroxide, and 1 part of functional additives;

[0049] The preparation method of the modified boron nitride nano powder is as follows: a mixed solution of ethanol and deionized water is prepared, and the pH is adjusted to 4.5 using glacial acetic acid. While stirring, γ-aminopropyl triethoxysilane and octadecyl trimethoxysilane are added, and the mixture is stirred until uniform. Hexagonal boron nitride powder and nano zinc oxide are added, and a pre-dispersed suspension is obtained. The pre-dispersed suspension is placed in an ice water bath, and ultrasonic treatment is performed. Condensation reflux is performed, and the precipitate is collected by centrifugation. The precipitate is re-dispersed in a mixed solution of anhydrous ethanol and deionized water, and centrifugation is performed again. This process is repeated 5 times to obtain a modified boron nitride nano sheet precipitate. The modified boron nitride nano sheet precipitate is dispersed in ethanol, and dried for 15h to obtain the modified boron nitride nano powder. In the preparation method of the modified boron nitride nano powder, the weight amounts of the components are as follows: 170 parts of ethanol, 3.5 parts of γ-aminopropyl triethoxysilane, 3.5 parts of octadecyl trimethoxysilane, 70 parts of hexagonal boron nitride powder, and 2.4 parts of nano zinc oxide;

[0050] The functional additives include a defoaming agent and an ultraviolet absorber;

[0051] A preparation method of a carbonization-resistant coating, which is prepared according to the carbonization-resistant coating described above, comprising the following preparation steps:

[0052] S1: weighing the components in proportion;

[0053] S2: adding the modified boron nitride nano-powder into deionized water, and ultrasonic dispersion for 38 min to prepare a boron nitride suspension;

[0054] S3: mixing the vinyl ester resin, styrene and methyl ethyl ketone peroxide, and stirring uniformly; during the stirring, forward and reverse intermittent stirring is adopted, clockwise stirring for 3 min at a speed of 350 rpm, static setting for 3 min, and then counterclockwise stirring for 3 min at a speed of 500 rpm; then, the rutile titanium dioxide, glass flake, mica powder, nano-zirconium dioxide and nano-silicon dioxide are added in sequence and mixed uniformly to obtain a mixed solution;

[0055] S4: heating the mixed solution to 56℃, adding the boron nitride suspension, ultrasonic dispersion for 17 min, continuing to heat to 70℃, then adding the functional additive, and low-speed stirring (190 rpm) for 10 min until mixed uniformly to obtain a primary coating;

[0056] S5: maturing the primary coating, and filtering the product coating using a 200-mesh filter screen;

[0057] The maturing of the primary coating comprises the following steps:

[0058] S701: placing the primary coating in a sealed container, and low-speed stirring at 55℃ and 60 rpm for maturing for 30 min;

[0059] S702: stopping the stirring, starting the vacuum system, reducing the pressure to -0.095 MPa, and maintaining for 38 min for vacuum defoaming;

[0060] S703: releasing the vacuum, discharging the coating, and static setting for maturing for 11 h in an environment at 25℃.

[0061] Example Two

[0062] A carbonization-resistant coating, comprising the following components by weight:

[0063] vinyl ester resin 35 parts, rutile titanium dioxide 7 parts, glass flake 10 parts, mica powder 4.5 parts, nano-zirconium dioxide 2 parts, nano-silicon dioxide 2.5 parts, modified boron nitride nano-powder 2 parts, styrene 6.5 parts, methyl ethyl ketone peroxide 1.5 parts and functional additive 1.5 parts;

[0064] The preparation method of the modified boron nitride nano powder is as follows: a mixed solution of ethanol and deionized water is configured, glacial acetic acid is used to adjust the pH to 4.5, γ-aminopropyl triethoxysilane and octadecyl trimethoxysilane are added while stirring, the mixture is stirred uniformly, hexagonal boron nitride powder and nano zinc oxide are added, a pre-dispersed suspension is obtained by stirring, the pre-dispersed suspension is placed in an ice water bath, ultrasonic treatment is performed, condensation reflux is performed, the precipitate is collected by centrifugation, the precipitate is redispersed in a mixed solution of anhydrous ethanol and deionized water, centrifugation is performed again, the above steps are repeated 5 times, a modified boron nitride nano sheet precipitate is obtained, the modified boron nitride nano sheet precipitate is dispersed in ethanol, and drying is performed for 15 h to obtain the modified boron nitride nano powder, and the weight amount of each component in the preparation method of the modified boron nitride nano powder is as follows: 170 parts of ethanol, 3.5 parts of γ-aminopropyl triethoxysilane, 3.5 parts of octadecyl trimethoxysilane, 70 parts of hexagonal boron nitride powder, and 2.4 parts of nano zinc oxide;

[0065] The functional additives include a defoaming agent and an ultraviolet absorber;

[0066] A preparation method of the anti-carbonization coating, which is prepared according to the anti-carbonization coating described above, comprises the following preparation steps:

[0067] S1: proportionally weighing each component;

[0068] S2: adding the modified boron nitride nano powder into deionized water, and ultrasonic dispersing for 38 min to prepare a boron nitride suspension;

[0069] S3: mixing the vinyl ester resin, styrene and peroxide methyl ethyl ketone, and stirring uniformly, wherein, during the stirring, forward and reverse intermittent stirring is adopted, clockwise stirring is performed for 3 min at a speed of 350 rpm, static setting is performed for 3 min, counterclockwise stirring is performed for 3 min at a speed of 500 rpm, and then rutile titanium dioxide, glass flake, mica powder, nano zirconium dioxide and nano silicon dioxide are sequentially added and mixed uniformly to obtain a mixed solution;

[0070] S4: heating the mixed solution to 56℃, adding the boron nitride suspension, ultrasonic dispersing for 17 min, continuing to heat to 70℃, then adding the functional additives, and stirring at a low speed (190 rpm) for 10 min until the mixture is uniform to obtain a primary coating;

[0071] S5: maturing the primary coating, and filtering the matured primary coating through a 200-mesh filter screen to obtain a finished coating;

[0072] The maturing of the primary coating comprises the following steps:

[0073] S701: placing the primary coating in a sealed container, and maturing at a low speed of 60 rpm at 55℃ for 30 min;

[0074] S702: stop stirring, start the vacuum system, reduce the pressure to-0.095 MPa, and maintain for 38 min for vacuum defoaming;

[0075] S703: release the vacuum, discharge the paint, and stand for curing at 25°C for 11 h.

[0076] Example Three

[0077] A carbonization-resistant paint, comprising the following components by weight:

[0078] 38 parts of vinyl ester resin, 8 parts of rutile titanium dioxide, 12 parts of glass flake, 6 parts of mica powder, 3 parts of nano-zirconium dioxide, 3 parts of nano-silicon dioxide, 3 parts of modified boron nitride nano-powder, 8 parts of styrene, 2 parts of methyl ethyl ketone peroxide, and 2 parts of functional additives;

[0079] The preparation method of the modified boron nitride nano-powder is as follows: a mixed solution of ethanol and deionized water is prepared, the pH is adjusted to 4.5 using glacial acetic acid, γ-aminopropyl triethoxysilane and octadecyl trimethoxysilane are added while stirring, the mixture is stirred uniformly, hexagonal boron nitride powder and nano-zinc oxide are added, a pre-dispersed suspension is obtained, the pre-dispersed suspension is placed in an ice water bath, ultrasonic treatment is performed, condensation reflux is performed, the precipitate is collected by centrifugation, the precipitate is redispersed in a mixed solution of anhydrous ethanol and deionized water, centrifugation is performed again, the process is repeated 5 times, modified boron nitride nano-sheet precipitate is obtained, the modified boron nitride nano-sheet precipitate is dispersed in ethanol, and dried for 15 h to obtain the modified boron nitride nano-powder. In the preparation method of the modified boron nitride nano-powder, the weight amount of each component is as follows: 170 parts of ethanol, 3.5 parts of γ-aminopropyl triethoxysilane, 3.5 parts of octadecyl trimethoxysilane, 70 parts of hexagonal boron nitride powder, and 2.4 parts of nano-zinc oxide.

[0080] The functional additives include a defoaming agent and an ultraviolet absorber.

[0081] A preparation method of a carbonization-resistant paint, which is prepared according to the carbonization-resistant paint described above, comprising the following preparation steps:

[0082] S1: weigh each component according to the proportion;

[0083] S2: add the modified boron nitride nano-powder to deionized water, and ultrasonically disperse for 38 min to prepare a boron nitride suspension;

[0084] S3: Mix vinyl ester resin, styrene and methyl ethyl ketone peroxide, and stir evenly. When stirring, use intermittent forward and reverse stirring. Stir clockwise for 3 minutes at 350 rpm, let stand for 3 minutes, and then stir counterclockwise for 3 minutes at 500 rpm. Add rutile titanium dioxide, glass flakes, mica powder, nano zirconium dioxide and nano silica in sequence, and mix evenly to obtain a mixture.

[0085] S4: Heat the mixture to 56°C, add boron nitride suspension, ultrasonically disperse for 17 min, continue heating to 70°C, add functional additives, stir at low speed (190 rpm) for 10 min until uniformly mixed, and obtain the primary coating.

[0086] S5: The primary coating is matured and filtered through a 200-mesh filter to obtain the finished coating;

[0087] The maturation of the primary coating includes the following steps:

[0088] S701: Place the primary coating in a sealed container and mature it by stirring at low speed at 55℃ and 60rpm for 30min.

[0089] S702: Stop stirring, turn on the vacuum system, reduce the pressure to -0.095MPa, and maintain it for 38 minutes for vacuum degassing;

[0090] S703: Release the vacuum, export the coating, and allow it to stand and mature at 25°C for 11 hours.

[0091] Comparative Example 1

[0092] An anti-carbonation coating comprises the following components in parts by weight:

[0093] The mixture contains 35 parts vinyl ester resin, 7 parts rutile titanium dioxide, 4.5 parts mica powder, 2 parts nano zirconium dioxide, 2.5 parts nano silica, 2 parts modified boron nitride nanopowder, 6.5 parts styrene, 1.5 parts methyl ethyl ketone peroxide, and 1.5 parts functional additives.

[0094] The preparation method of the modified boron nitride nano powder is as follows: a mixed solution of ethanol and deionized water is configured, glacial acetic acid is used to adjust the pH to 4.5, γ-aminopropyl triethoxysilane and octadecyl trimethoxysilane are added while stirring, the mixture is stirred uniformly, hexagonal boron nitride powder and nano zinc oxide are added, a pre-dispersed suspension is obtained by stirring, the pre-dispersed suspension is placed in an ice water bath, ultrasonic treatment is performed, condensation reflux is performed, the precipitate is collected by centrifugation, the precipitate is redispersed in a mixed solution of anhydrous ethanol and deionized water, centrifugation is performed again, the above steps are repeated 5 times, a modified boron nitride nano sheet precipitate is obtained, the modified boron nitride nano sheet precipitate is dispersed in ethanol, and the mixture is dried for 15 hours to obtain the modified boron nitride nano powder; in the preparation method of the modified boron nitride nano powder, the weight amount of each component is as follows: 170 parts of ethanol, 3.5 parts of γ-aminopropyl triethoxysilane, 3.5 parts of octadecyl trimethoxysilane, 70 parts of hexagonal boron nitride powder, and 2.4 parts of nano zinc oxide;

[0095] The functional additives include a defoaming agent and an ultraviolet absorber;

[0096] A preparation method of the carbonization-resistant coating, which is prepared according to the carbonization-resistant coating described above, comprises the following preparation steps:

[0097] S1: proportionally weighing each component;

[0098] S2: adding the modified boron nitride nano powder into deionized water, and ultrasonic dispersing for 38 minutes to prepare a boron nitride suspension;

[0099] S3: mixing the vinyl ester resin, the styrene and the methyl ethyl ketone peroxide, and stirring uniformly; during the stirring, forward and reverse intermittent stirring is adopted, wherein clockwise stirring is performed for 3 minutes at a speed of 350 rpm, static setting is performed for 3 minutes, counterclockwise stirring is performed for 3 minutes at a speed of 500 rpm, and the rutile titanium dioxide, the mica powder, the nano zirconium dioxide and the nano silicon dioxide are sequentially added and mixed uniformly to obtain a mixed solution;

[0100] S4: heating the mixed solution to 56°C, adding the boron nitride suspension, ultrasonic dispersing for 17 minutes, continuously heating to 70°C, adding the functional additives, and stirring at a low speed (190 rpm) for 10 minutes until the mixture is uniform to obtain a primary coating;

[0101] S5: maturing the primary coating, and filtering the matured primary coating through a 200-mesh filter screen to obtain a finished coating;

[0102] The maturing of the primary coating comprises the following steps:

[0103] S701: placing the primary coating in a sealed container, and maturing at a low speed of 60 rpm at 55°C for 30 minutes;

[0104] S702: Stop stirring, turn on the vacuum system, reduce the pressure to -0.095MPa, and maintain it for 38 minutes for vacuum degassing;

[0105] S703: Release the vacuum, export the coating, and allow it to stand and mature at 25°C for 11 hours.

[0106] Comparative Example 2

[0107] An anti-carbonation coating comprises the following components in parts by weight:

[0108] The composition includes 35 parts vinyl ester resin, 7 parts rutile titanium dioxide, 10 parts glass flakes, 4.5 parts mica powder, 2 parts nano zirconium dioxide, 2.5 parts nano silica, 6.5 parts styrene, 1.5 parts methyl ethyl ketone peroxide, and 1.5 parts functional additives.

[0109] The functional additives include defoamers and ultraviolet absorbers;

[0110] A method for preparing an anti-carbonation coating, comprising the following steps:

[0111] S1: Weigh each component according to the proportion;

[0112] S2: Mix vinyl ester resin, styrene and methyl ethyl ketone peroxide, and stir evenly. When stirring, use intermittent forward and reverse stirring. Stir clockwise for 3 minutes at 350 rpm, let stand for 3 minutes, and then stir counterclockwise for 3 minutes at 500 rpm. Add rutile titanium dioxide, glass flakes, mica powder, nano zirconium dioxide and nano silica in sequence, and mix evenly to obtain a mixture.

[0113] S3: Heat the mixture to 70°C, add the functional additive, and stir at low speed (190 rpm) for 10 minutes until the mixture is uniform to obtain the primary coating.

[0114] S4: The primary coating is matured and filtered through a 200-mesh filter to obtain the finished coating;

[0115] The maturation of the primary coating includes the following steps:

[0116] S701: Place the primary coating in a sealed container and mature it by stirring at low speed at 55℃ and 60rpm for 30min.

[0117] S702: Stop stirring, turn on the vacuum system, reduce the pressure to -0.095MPa, and maintain it for 38 minutes for vacuum degassing;

[0118] S703: Release the vacuum, export the coating, and allow it to stand and mature at 25°C for 11 hours.

[0119] Comparative Example Three

[0120] A carbonization-proof coating, comprising the following components by weight:

[0121] 35 parts of vinyl ester resin, 7 parts of rutile titanium dioxide, 4.5 parts of mica powder, 2 parts of nano-zirconium dioxide, 2.5 parts of nano-silicon dioxide, 6.5 parts of styrene, 1.5 parts of methyl ethyl ketone peroxide, and 1.5 parts of functional additives;

[0122] The functional additives include defoaming agents and ultraviolet absorbers;

[0123] A preparation method of a carbonization-proof coating, prepared according to the carbonization-proof coating described above, comprising the following preparation steps:

[0124] S1: weighing the components in proportion;

[0125] S2: mixing the vinyl ester resin, styrene and methyl ethyl ketone peroxide, and stirring uniformly, wherein the stirring is carried out in a forward and reverse intermittent manner, clockwise stirring for 3 min at a speed of 350 rpm, static setting for 3 min, counterclockwise stirring for 3 min at a speed of 500 rpm, and sequentially adding the rutile titanium dioxide, mica powder, nano-zirconium dioxide and nano-silicon dioxide, and mixing uniformly to obtain a mixed solution;

[0126] S3: adding the functional additives to the mixed solution after heating to 70℃, and stirring at a low speed (190 rpm) for 10 min until mixed uniformly to obtain a primary coating;

[0127] S4: aging the primary coating, and filtering the product coating using a 200-mesh filter screen;

[0128] The aging of the primary coating comprises the following steps:

[0129] S701: placing the primary coating in a sealed container, and aging at a low speed under stirring at 55℃ and 60 rpm for 30 min;

[0130] S702: stopping the stirring, starting a vacuum system, reducing the pressure to -0.095 MPa, and maintaining for 38 min for vacuum defoaming;

[0131] S703: releasing the vacuum, discharging the coating, and static setting for aging at 25℃ for 11 h.

[0132] Comparative Example Four

[0133] A carbonization-proof coating, comprising the following components by weight:

[0134] vinyl ester resin 35 parts, rutile titanium dioxide 7 parts, glass flake 10 parts, mica powder 4.5 parts, nano zirconium dioxide 2 parts, nano silicon dioxide 2.5 parts, hexagonal boron nitride powder 2 parts, styrene 6.5 parts, methyl ethyl ketone peroxide 1.5 parts, and functional additives 1.5 parts;

[0135] The functional additives include defoaming agents and ultraviolet absorbers;

[0136] A preparation method of the carbonization-resistant coating, prepared according to the carbonization-resistant coating described above, comprises the following preparation steps:

[0137] S1: proportionally weigh each component;

[0138] S2: add the hexagonal boron nitride powder into deionized water, and ultrasonically disperse for 38 min to prepare a boron nitride suspension;

[0139] S3: mix the vinyl ester resin, styrene and methyl ethyl ketone peroxide, and uniformly stir; during the stirring, the forward and reverse intermittent stirring is adopted, wherein clockwise stirring is performed for 3 min at a speed of 350 rpm, static setting is performed for 3 min, counterclockwise stirring is performed for 3 min at a speed of 500 rpm, and the rutile titanium dioxide, glass flake, mica powder, nano zirconium dioxide and nano silicon dioxide are sequentially added and uniformly mixed to obtain a mixed solution;

[0140] S4: heat the mixed solution to 56℃, add the boron nitride suspension, ultrasonically disperse for 17 min, continue to heat to 70℃, then add the functional additives, and uniformly mix at a low speed (190 rpm) for 10 min to obtain a primary coating;

[0141] S5: mature the primary coating, and filter the matured primary coating using a 200-mesh filter screen to obtain a finished coating;

[0142] The maturation of the primary coating comprises the following steps:

[0143] S701: place the primary coating in a sealed container, and mature at a low speed of 60 rpm at 55℃ for 30 min;

[0144] S702: stop the stirring, start a vacuum system, reduce the pressure to-0.095 MPa, and maintain the pressure for 38 min to perform vacuum defoaming;

[0145] S703: release the vacuum, guide the coating out of the container, and mature the coating at 25℃ for 11 h.

[0146] Experimental group

[0147] The paint prepared according to the components and preparation method provided in Embodiment One, Embodiment Two, Embodiment Three, Comparative Example One, Comparative Example Two, Comparative Example Three, Comparative Example Four is respectively applied on a concrete test block with a size of 150mm*150mm*150mm, the application thickness is 1.2mm, and the coating area is 5000mm 2 At 25℃, humidity 60%, and curing for 72h.

[0148] Carbonization test:

[0149] The test block is placed in a carbonization box (CO2 concentration ≥20%, temperature 20±2℃, humidity 60±5%), and the carbonization depth after 25 days of testing is measured. After 25 days, the test piece is split, and 1% phenolphthalein alcohol solution is immediately sprayed on the split surface. The phenolphthalein indicator method is used to measure the carbonization depth (the uncarbonized area is red, and the carbonized area is colorless). The uncarbonized part of the concrete (pH>9) turns red, and the carbonized part (pH<9) does not change color. The average carbonization depth (mm) is measured with a vernier caliper;

[0150] Ultraviolet aging test: xenon lamp aging box (300W / m 2 , humidity 65%, cycle 8h light + 4h condensation), and the surface state of the coating (powdering, loss rate) after 500h of testing is observed;

[0151] Water resistance test: the test block is immersed in distilled water (25℃) for 96h, and the peeling and falling of the coating is observed;

[0152] Adhesion test:

[0153] The adhesion of the obtained paint is tested according to GB / T5210-2006 “Determination of Coating Adhesion Pull-off Method”;

[0154]

[0155] According to the data in the table, it can be known from the data of Embodiment One, Embodiment Two and Embodiment Three that the components and preparation method provided by the present application can effectively reduce the carbonization depth, reduce ultraviolet aging, and have better performance in water resistance and adhesion. According to the data of Comparative Example One, Comparative Example Two, Comparative Example Three and Comparative Example Four, it can be known that glass flake and modified boron nitride nano powder can effectively improve the performance of the coating in carbonization depth, ultraviolet aging, water resistance and adhesion, and the effect of modified boron nitride nano powder is better than that of glass flake. Both have a certain synergistic effect. According to the data of Comparative Example Four and each embodiment, it can be known that the use of modified boron nitride nano powder in the preparation of the anti-carbonization coating is better than the direct use of hexagonal boron nitride powder. This shows that the modification of hexagonal boron nitride powder improves the anti-carbonization effect.

[0156] The above merely illustrates the embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process conversion, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A carbonization-preventive paint characterized by comprising, The following components are included by weight parts: Vinyl ester resin 32-38 parts, rutile titanium dioxide 6-8 parts, glass flake 8-12 parts, mica powder 3-6 parts, nano zirconium dioxide 1-3 parts, nano silicon dioxide 2-3 parts, modified boron nitride nano powder 1-3 parts, styrene 5-8 parts, methyl ethyl ketone peroxide 1-2 parts, and functional additives 1-2 parts; The preparation method of the modified boron nitride nano powder is: a mixed solution of ethanol and deionized water is configured, the PH is adjusted to 4-5, γ-aminopropyl triethoxysilane and octadecyl trimethoxysilane are added while stirring, stirring is uniform, hexagonal boron nitride powder and nano zinc oxide are added, and a pre-dispersed suspension is obtained. The pre-dispersed suspension is placed in an ice water bath, ultrasonic treatment is performed, condensation reflux is performed, the precipitate is collected by centrifugation, the precipitate is redispersed in a mixed solution of anhydrous ethanol and deionized water, centrifugation is performed again, the process is repeated 3-6 times, and modified boron nitride nano sheet precipitate is obtained. The modified boron nitride nano sheet precipitate is dispersed in ethanol, dried for 12-18 hours, and the modified boron nitride nano powder is obtained.

2. The carbonization-preventive paint according to claim 1, characterized by, The following components are included by weight parts: Vinyl ester resin 32-38 parts, rutile titanium dioxide 6-8 parts, glass flake 8-12 parts, mica powder 3-6 parts, nano zirconium dioxide 1-3 parts, nano silicon dioxide 2-3 parts, modified boron nitride nano powder 1-3 parts, styrene 5-8 parts, methyl ethyl ketone peroxide 1-2 parts, and functional additives 1-2 parts; 3. The carbonization-preventive paint according to claim 1, characterized by, The functional additives include a defoaming agent and an ultraviolet absorber.

4. The carbonization-preventive paint according to claim 1, characterized by, The weight part amount of each component in the preparation method of the modified boron nitride nano powder is: ethanol 150-200 parts, γ-aminopropyl triethoxysilane 3-4 parts, octadecyl trimethoxysilane 3-4 parts, hexagonal boron nitride powder 60-80 parts, and nano zinc oxide 2-2.8 parts.

5. The carbonization-preventive paint according to claim 1, characterized by, When adjusting the PH of the mixed solution of ethanol and deionized water, ice acetic acid is used for adjustment.

6. A method for the preparation of a carbonization-resistant coating according to any one of claims 1 to 5, characterized in that The following preparation steps are included: S1: weigh each component according to the proportion; S2: add the modified boron nitride nano powder to deionized water, ultrasonic dispersion for 30-45 minutes, and prepare a boron nitride suspension; S3: mix the vinyl ester resin, styrene, and methyl ethyl ketone peroxide, stir uniformly, add the rutile titanium dioxide, glass flake, mica powder, nano zirconium dioxide, and nano silicon dioxide in sequence, mix uniformly, and obtain a mixed solution; S4: heat the mixed solution to 50-62°C, add the boron nitride suspension, ultrasonic dispersion for 10-25 minutes, continue to heat to 65-75°C, add the functional additives, stir at low speed for 10 minutes until mixed uniformly, and obtain a primary coating; S5: mature the primary coating, filter through a filter screen, and obtain a finished coating.

7. The method of claim 6, wherein the carbonization-preventing coating is prepared by a process comprising: When mixing the vinyl ester resin, styrene, and methyl ethyl ketone peroxide, the stirring adopts forward and reverse intermittent stirring, wherein clockwise stirring is performed for 3 minutes at a speed of 300-400 rpm, static for 3 minutes, counterclockwise stirring is performed for 3 minutes at a speed of 450-550 rpm.

8. The method of claim 6, wherein the carbonization-preventing coating is prepared by a process comprising: The filter screen is 200 mesh.

9. The method for preparing the anti-carbonization coating according to claim 6, characterized in that, The maturation of the primary coating includes the following steps: S701: Put the primary coating into a closed container, and mature for 30 min at 55℃ with low speed stirring at 60 rpm; S702: Stop stirring, start the vacuum system, and reduce the pressure to -0.095 MPa, and maintain for 30-45 min for vacuum defoaming; S703: Release the vacuum, and discharge the coating, and mature for 10-12 h at 25℃.

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