CN114410138A - Inorganic waterproof flame-retardant coating and preparation method thereof - Google Patents

Inorganic waterproof flame-retardant coating and preparation method thereof Download PDF

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CN114410138A
CN114410138A CN202111451367.1A CN202111451367A CN114410138A CN 114410138 A CN114410138 A CN 114410138A CN 202111451367 A CN202111451367 A CN 202111451367A CN 114410138 A CN114410138 A CN 114410138A
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coating
magnesium
water
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CN114410138B (en
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符思
廖位红
梁巧敏
傅国景
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Guangzhou Hotech Building Materials Co ltd
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Guangzhou Hotech Building Materials Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • C09D1/02—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/18—Fireproof paints including high temperature resistant paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds

Abstract

The invention discloses an inorganic waterproof flame-retardant material and a preparation method thereof, the inorganic waterproof flame-retardant material takes water, phosphate, lithium water glass, a magnesium-containing compound, modified silicon dioxide, jade powder, kaolin, coarse whiting, a dispersing agent, a thickening agent and a defoaming agent as main components, wherein the lithium water glass is used as a main film forming substance and combines the combined action of the modified silicon dioxide, the magnesium-containing compound and other raw materials, so that the water resistance and the scouring resistance of a coating are effectively improved. When the coating is coated on the surface of a wall or a building material, the wall or the building material has better high temperature resistance, water resistance, fire resistance and other properties. The preparation method is simple, and the prepared inorganic waterproof flame-retardant material can reduce the damage and pulverization of a coating caused by water wetting and scouring due to hydrophobicity, so that the service life of the inorganic waterproof flame-retardant material in a humid and rainy environment is greatly prolonged.

Description

Inorganic waterproof flame-retardant coating and preparation method thereof
Technical Field
The invention belongs to the technical field of inorganic coatings, and relates to an inorganic waterproof flame-retardant coating and a preparation method thereof.
Background
Compared with organic coatings, the inorganic coatings have the advantages of rich components, low cost, low organic compound content, low VOCs (volatile organic compounds) and low sensitization; and the main component of the inorganic coating is an inorganic substance, on one hand, the inorganic component can generate petrochemical action with a mineral substrate and is well attached to the substrate, and on the other hand, the inorganic component has particularly good high-temperature resistance and can not burn at high temperature. Therefore, the inorganic coating has high stability and aging resistance, has a service life of dozens of years, meets the requirements of people on energy conservation and environmental protection of modern building materials, and is favored by people as an environment-friendly flame retardant coating.
However, the inorganic coating is prepared by mixing inorganic substances, is different from a cross-linking film between organic coating polymers, and the inorganic substances are exposed in the environment for a long time, and are affected by the environment, particularly wetting and scouring of water, and the adhesiveness among inorganic components is reduced, so that the coating of the coating is pulverized, and the flame retardant property of the coating is reduced. Therefore, enhancing the water resistance of inorganic coatings is a problem that inorganic coatings must overcome.
Disclosure of Invention
In order to overcome the defects of the prior art, the first object of the invention is to provide an inorganic waterproof flame-retardant coating, which has excellent flame-retardant property, and the coating has super-hydrophobic property by modifying silicon dioxide, so that the coating can resist water infiltration and scouring and avoid chalking of the coating.
The second purpose of the invention is to provide a preparation method of the inorganic waterproof flame-retardant coating.
The first purpose of the invention can be achieved by adopting the following technical scheme:
the inorganic waterproof flame-retardant coating is characterized by comprising the following components in parts by weight:
35-45 parts of water, 5-20 parts of phosphate powder, 10-40 parts of lithium water glass, 1-5 parts of magnesium-containing compound, 1-5 parts of modified silicon dioxide, 5-15 parts of jade powder, 5-8 parts of kaolin, 5-10 parts of heavy calcium carbonate, 1-4 parts of dispersing agent, 2-4 parts of thickening agent and 1-4 parts of defoaming agent.
Further, the inorganic waterproof flame-retardant coating is characterized by comprising the following components in parts by weight: 38-41 parts of water, 10-15 parts of phosphate powder, 15-30 parts of lithium water glass, 2-4 parts of magnesium-containing compound, 2-4 parts of modified silicon dioxide, 8-12 parts of jade powder, 6-7 parts of kaolin, 6-8 parts of heavy calcium carbonate, 2-3 parts of dispersing agent, 3-4 parts of thickening agent and 2-3 parts of defoaming agent.
Further, the modified preparation method of the modified silicon dioxide comprises the following steps:
s31, adding ethyl orthosilicate, (2, 3-epoxypropoxy) propyl trimethoxy silane and hydrochloric acid into the ethanol solution to obtain a mixed solution;
s32 and hexadecyl trimethoxy silane are added into the mixed solution obtained in the step S31, and the mixture is stirred at room temperature to obtain the modified silicon dioxide.
Further, in step S32, hexadecyl trimethoxy silane with the mass of 5% of ethyl orthosilicate is added into the reaction liquid obtained in step S31, and the mixture is continuously stirred for 7 to 9 hours at room temperature; and adding hexadecyl trimethoxy silane accounting for 5 percent of the weight of the ethyl orthosilicate and continuously stirring for 16-20h at room temperature.
Further, in step S31, the molar ratio of ethyl orthosilicate, (2, 3-epoxypropoxy) propyl trimethoxy silane and hydrochloric acid is 1 (0.10-0.12) to (0.008-0.01).
Further, the phosphate powder is one or a combination of more than two of ammonium phosphate, sodium phosphate and potassium phosphate.
Further, SiO in lithium water glass2And Li2The molar ratio of O is 4.5-8.5.
Further, the magnesium-containing compound is one or a combination of more than two of magnesium oxide, magnesium carbonate, magnesium hydroxide, dolomite and magnesium chloride.
The invention also provides a preparation method of the inorganic waterproof flame-retardant coating, which is characterized by comprising the following steps:
s11, pouring the lithium water glass, the modified silicon dioxide, the magnesium-containing compound and the jade powder into a stirring device for mixing and stirring, and adding water during stirring to obtain a mixed solution;
s12, adding a defoaming agent, a thickening agent and a dispersing agent into the mixed solution prepared in the S11, and continuously stirring to obtain a mixed coating;
and S13, adding phosphate, kaolin and coarse whiting after the mixed coating prepared in the S12 has no obvious bubbles, and continuously stirring for 30-80min to obtain the finished product of the inorganic coating.
Further, the rotating speed of the stirring device is controlled at 200-400r/min, and the stirring temperature is 20-30 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides an inorganic waterproof flame-retardant coating, wherein the lithium water glass has excellent water resistance and provides better flame retardance by combining with phosphate, and the water resistance of the coating can be obviously improved by combining modified silicon dioxide and a magnesium-containing compound; after the coating is coated on the surface of a wall or a building material, the wall or the building material has better high-temperature resistance, water resistance, fire resistance and other properties, and particularly, the damage and pulverization of the coating caused by wetting and scouring of water can be reduced due to the hydrophobicity, so that the service life of the coating under a humid and rainy environment is greatly prolonged.
2. The inorganic waterproof flame-retardant coating can quickly prepare an inorganic coating with excellent quality by adopting a simple preparation method, and after the coating is coated on the surface of a mineral matrix, the coating is resistant to water infiltration and scouring and avoids pulverization of the coating.
Drawings
FIG. 1 is a contact angle measurement of the coating of example 3 applied to a flat asbestos-free fiber cement panel.
Detailed Description
The invention will be further described with reference to specific embodiments:
in order to increase the water resistance of the inorganic coating, the inorganic coating is generally modified by a fluorosilane hydrophobic modifier, so that the hydrophobicity of the coating is increased, but the fluorine pollution caused by fluorine-containing compounds is more and more emphasized, so that the invention uses the modified silica nano composite material to form a durable non-fluorinated super-hydrophobic compound as a component of the inorganic coating to jointly increase the scouring resistance of the inorganic coating.
An inorganic waterproof flame-retardant coating comprises the following components in parts by weight:
33-45 parts of water, 5-20 parts of phosphate powder, 10-40 parts of lithium water glass, 1-5 parts of magnesium-containing compound, 1-5 parts of modified silicon dioxide, 5-15 parts of jade powder, 5-8 parts of kaolin, 5-10 parts of heavy calcium carbonate, 1-4 parts of dispersing agent, 2-4 parts of thickening agent and 1-4 parts of defoaming agent.
As a preferred embodiment, the inorganic waterproof flame-retardant coating comprises the following components in parts by weight: 36-41 parts of water, 10-15 parts of phosphate powder, 15-30 parts of lithium water glass, 2-4 parts of magnesium-containing compound, 2-4 parts of modified silicon dioxide, 8-12 parts of jade powder, 6-7 parts of kaolin, 6-8 parts of heavy calcium carbonate, 2-3 parts of dispersing agent, 3-4 parts of thickening agent and 2-3 parts of defoaming agent.
The silicate is SiO which is the mixing ratio of quartz sand and alkali metal oxide2And M2The molar ratio of O (M is potassium or sodium) indicates the composition of the silicate, and water glass has the disadvantage of poor water resistance, so that water glass cannot be used in humid and alkaline environments. Therefore, various curing agents such as fluorosilicates are generally used to improve the water resistance of the curing agent, but a satisfactory effect has not yet been obtained.
The water glass is based on lithium silicate, so that the water resistance of the potassium oxide or sodium oxide based water glass can be improved; in order to obtain a more water-resistant water glass coating, the composition also comprises a magnesium-containing compound, wherein magnesium in the magnesium-containing compound is subjected to a condensation reaction with silicate, and is used as a connecting site to be combined with silicate-based water glass or inserted into the silicate to form a network structure, so that on one hand, the compatibility with water can be increased, the lithium water glass has better dispersibility and stability, and on the other hand, the bonding strength of the coating to a substrate can be improved, and the coating is not easy to fall off.
Among them, the amount of the lithium water glass is not so small that the improvement of water resistance and heat resistance is not remarkable, and if it is too large, the concentration of the coating composition becomes too high, the workability becomes poor, and the coating film is broken, so that the above-mentioned addition amount is selected. Phosphate is an excellent inorganic flame retardant, so the phosphate is added into the coating of the invention as a flame retardant to enhance the heat resistance and flame retardance of the coating together with the lithium water glass.
As a preferred embodiment, the modified silica is prepared by a modification method comprising:
s31, adding ethyl orthosilicate, (2, 3-epoxypropoxy) propyl trimethoxy silane and hydrochloric acid into the ethanol solution to obtain a mixed solution;
s32 and hexadecyl trimethoxy silane are added into the mixed solution obtained in the step S31, and the mixture is stirred at room temperature to obtain the modified silicon dioxide.
The modified silicon dioxide in the coating is prepared by carrying out cohydrolysis and polycondensation reaction on ethyl orthosilicate, ethyl (2, 3-epoxypropoxy) propyl trimethoxy silane and hexadecyl trimethoxy silane which are precursors of silicon dioxide under the condition of hydrochloric acid, and is not modified by using fluorosilane, the surface of the obtained modified silicon dioxide contains a large amount of hexadecyl hydrophobic groups, a hydrophobic layer can be formed on the surface of the coating when the coating is coated by utilizing the characteristics of hydrophobicity and self-assembly, and when water contacts with the hydrophobic layer on the surface of the coating, the hydrophobic layer can reduce the wetting of the coating by the water and prevent the water from entering the coating, so that the damage and pulverization of the coating after the water is evaporated are avoided.
The preparation method of the modified silicon dioxide is simple, and the ethyl orthosilicate, (2, 3-epoxypropoxy) propyl trimethoxy silane and hexadecyl trimethoxy silane are stirred and mixed at room temperature under the hydrochloric acid condition.
In a preferred embodiment, step S32 includes adding 5% by weight of ethyl orthosilicate hexadecyl trimethoxysilane to the reaction solution obtained in step S31, and continuing stirring at room temperature for 7-9 h; and adding hexadecyl trimethoxy silane accounting for 5 percent of the weight of the ethyl orthosilicate and continuously stirring for 16-20h at room temperature. The hexadecyl trimethoxy silane is reacted twice, and according to the reaction principle, the formed silicon dioxide can be fully modified, so that the performance of the modified silicon dioxide is improved.
As a preferred embodiment, the molar ratio of ethyl orthosilicate, (2, 3-epoxypropoxy) propyltrimethoxysilane and hydrochloric acid in the step S31 is 1 (0.10-0.12) to (0.008-0.01).
In principle, any molar ratio of starting materials can be used to prepare the modified silica, but the hydrophobicity of the resulting modified silica is best when the molar ratio of ethyl orthosilicate, (2, 3-glycidoxy) propyltrimethoxysilane, and hydrochloric acid is 1 (0.10-0.12) to (0.008-0.01), and hexadecyltrimethoxysilane is 10% of the total amount of ethyl orthosilicate.
In a preferred embodiment, the phosphate powder is one or a combination of two or more of ammonium phosphate, sodium phosphate and potassium phosphate.
As a preferred embodiment, SiO in lithium water glass2And Li2The molar ratio of O is 4.5-8.5. Generally, the higher the modulus in sodium silicate, the less soluble the solid sodium silicate in water, but the more soluble the lithium silicate glass is in the range of 4.5-8.5 SiO2With Li2When the modulus is smaller, the micelle particles in the lithium water glass are smaller in particle size, good in dispersion condition, larger in modulus and larger in particle size, and form a chain structure through bonding of Si-O alkali, and the bonding degree of the micelle particles Si-O alkali in the solution is further improved along with the modulus reaching above 4.5 and is expanded from one dimension to two dimensions to form a network structure. The modulus is increased to 8.5 or more, and the dispersion degree is too low to be suitable for uniform film formation. Lithium water glass having such a high molar ratio can therefore be dissolved in water and has excellent water resistance, and can contribute to promotion of water resistance and heat resistance of the coating film of the composition of the present invention.
In a preferred embodiment, the magnesium-containing compound is one or a combination of two or more of magnesium oxide, magnesium carbonate, magnesium hydroxide, dolomite, and magnesium chloride.
The magnesium-containing compound is used as a substance which reacts with the lithium water glass and the modified silicon dioxide, the lithium water glass and the modified silicon dioxide can be combined to form a network structure, firm Si-O bonds are formed among silicon dioxide particles to form a continuous network structure film, and molecules of the magnesium-containing compound are inserted among Si-O to form a three-dimensional interpenetrating network structure; on the one hand, the dispersibility and the stability are improved, and on the other hand, the adhesion of the coating is improved.
As a preferred embodiment, the dispersant is a conventional dispersant, and may be one or a combination of two or more of BYK190, Dego740W, and 5040.
As a preferred embodiment, the thickener may be hydroxyethyl cellulose.
As a preferred embodiment, the defoaming agent is one or a combination of more than two of BYK024, TEGO810 and DC-65.
The invention also provides a preparation method of the inorganic waterproof flame-retardant coating, which comprises the following steps:
s11, pouring the lithium water glass, the modified silicon dioxide, the magnesium-containing compound and the jade powder into a stirring device for mixing and stirring, and adding water during stirring to obtain a mixed solution;
s12, adding a defoaming agent, a thickening agent and a dispersing agent into the mixed solution prepared in the S11, and continuously stirring to obtain a mixed coating;
and S13, adding phosphate, kaolin and coarse whiting after the mixed coating prepared in the S12 has no obvious bubbles, and continuously stirring for 30-80min to obtain the finished product of the inorganic coating.
The lithium water glass, the modified silicon dioxide, the magnesium-containing compound and the jade powder are poured into a stirring device to be stirred first, and then water is added to enable various substances to be mixed more uniformly, so that the reaction is more uniform and thorough. Then other raw materials are added, so that the components can be uniformly dispersed in the film-forming material, the coating is more stable, and the material in the coating is uniform after the coating is coated.
As a preferred embodiment, the rotating speed of the stirring device is controlled at 200-400r/min, and the stirring temperature is 20-30 ℃. Under the stirring speed, not only can the stirring and mixing effects be realized, but also more bubbles caused by over-high rotating speed can be prevented; and the temperature can ensure the progress of various reactions in the coating at a lower temperature, and the preparation limitation of the coating is low.
Example 1: preparation of modified silica
Adding ethyl orthosilicate, (2, 3-epoxypropoxy) propyl trimethoxy silane and hydrochloric acid into an absolute ethanol solution according to the ratio of 1:0.10:0.01, uniformly stirring, adding 0.5% of hexadecyl trimethoxy silane of the ethyl orthosilicate into the mixed solution, stirring for 7 hours at room temperature, then continuing stirring for 16 hours at room temperature for hexadecyl trimethoxy silane added with 0.5% of the ethyl orthosilicate again, and freeze-drying to remove the solvent after the reaction to obtain the modified silicon dioxide.
Example 2: preparation of modified silica
Adding ethyl orthosilicate, (2, 3-epoxypropoxy) propyl trimethoxy silane and hydrochloric acid into an absolute ethanol solution according to the ratio of 1:0.12:0.008, uniformly stirring, adding 0.5% of hexadecyl trimethoxy silane of the ethyl orthosilicate into the mixed solution, stirring at room temperature for 9 hours, then continuing stirring at room temperature for 20 hours with the hexadecyl trimethoxy silane of the ethyl orthosilicate of 0.5% again, and freeze-drying to remove the solvent after the reaction to obtain the modified silicon dioxide.
Example 3:
pouring 10 parts of lithium water glass with the modulus of 4.5, 2.5 parts of modified silicon dioxide prepared in example 1, 1 part of magnesium oxide and 5 parts of jade powder into a stirring device for mixing and stirring, and adding 33 parts of water during stirring to obtain a mixed solution; adding 1 part of BYK024 defoaming agent, 2 parts of hydroxyethyl cellulose and 1 part of BYK1901 dispersing agent into the mixed solution, continuously stirring until the mixed coating has no obvious bubbles, adding 5 parts of ammonium phosphate, 5 parts of kaolin and 5 parts of heavy calcium, and continuously stirring for 30min to obtain the finished inorganic coating.
Example 4:
pouring 20 parts of lithium water glass with the modulus of 5.5, 1 part of modified silicon dioxide prepared in example 2, 2.5 parts of magnesium carbonate and 8 parts of jade powder into a stirring device for mixing and stirring, and adding 36 parts of water during stirring to obtain a mixed solution; adding 2 parts of TEGO810 defoaming agent, 3 parts of hydroxyethyl cellulose and 2 parts of Dego740W dispersing agent into the mixed solution, continuously stirring until the mixed coating has no obvious bubbles, adding 10 parts of sodium phosphate, 6 parts of kaolin and 6 parts of heavy calcium, and continuously stirring for 40min to obtain the finished inorganic coating.
Example 5:
30 parts of lithium water glass with the modulus of 6, 3 parts of modified silicon dioxide prepared in example 1, 3 parts of dolomite and 12 parts of jade powder are poured into a stirring device for mixing and stirring, and 41 parts of water is added during stirring to obtain a mixed solution; and 3 parts of a DC-65 defoaming agent, 2 parts of hydroxyethyl cellulose and 3 parts of a 5040 dispersing agent are added into the mixed solution, the mixture is continuously stirred, 15 parts of potassium phosphate, 7 parts of kaolin and 8 parts of heavy calcium are added after the mixed coating has no obvious bubbles, and the mixture is continuously stirred for 50min to obtain the finished inorganic coating.
Example 6:
pouring 15 parts of lithium water glass with the modulus of 7.5, 4 parts of modified silicon dioxide prepared in example 1, 4 parts of magnesium chloride and 15 parts of jade powder into a stirring device for mixing and stirring, and adding 45 parts of water during stirring to obtain a mixed solution; adding 4 parts of BYK024 defoaming agent, 4 parts of hydroxyethyl cellulose and 4 parts of BYK1901 dispersing agent into the mixed solution, continuously stirring until the mixed coating has no obvious bubbles, adding 20 parts of ammonium phosphate, 8 parts of kaolin and 10 parts of heavy calcium, and continuously stirring for 60min to obtain the finished inorganic coating.
Example 7:
pouring 40 parts of lithium water glass with the modulus of 8.5, 5 parts of modified silicon dioxide prepared in example 2,3 parts of magnesium hydroxide and 10 parts of jade powder into a stirring device for mixing and stirring, and adding 40 parts of water during stirring to obtain a mixed solution; adding 2.5 parts of TEGO810 defoaming agent, 3 parts of hydroxyethyl cellulose and 2.5 parts of BYK1901 dispersing agent into the mixed solution, continuously stirring until the mixed coating has no obvious bubbles, adding 6 parts of ammonium phosphate, 6 parts of sodium phosphate, 6.5 parts of kaolin and 7.5 parts of heavy calcium carbonate, and continuously stirring for 80min to obtain the finished inorganic coating.
Comparative example 1
Pouring 10 parts of lithium water glass with the modulus of 4.5, 2.5 parts of silicon dioxide, 1 part of magnesium oxide and 5 parts of jade powder into a stirring device for mixing and stirring, and adding 33 parts of water during stirring to obtain a mixed solution; adding 1 part of BYK024 defoaming agent, 2 parts of hydroxyethyl cellulose and 1 part of BYK1901 dispersing agent into the mixed solution, continuously stirring until the mixed coating has no obvious bubbles, adding 5 parts of ammonium phosphate, 5 parts of kaolin and 5 parts of heavy calcium, and continuously stirring for 30min to obtain the finished inorganic coating.
Comparative example 2
20 parts of lithium water glass with the modulus of 5.5, 1 part of modified silicon dioxide prepared in example 2 and 8 parts of jade powder are poured into a stirring device for mixing and stirring, and 36 parts of water is added during stirring to obtain a mixed solution; adding 2 parts of TEGO810 defoaming agent, 3 parts of hydroxyethyl cellulose and 2 parts of Dego740W dispersing agent into the mixed solution, continuously stirring until the mixed coating has no obvious bubbles, adding 10 parts of sodium phosphate, 6 parts of kaolin and 6 parts of heavy calcium, and continuously stirring for 40min to obtain the finished inorganic coating.
Comparative example 3
Pouring 20 parts of lithium water glass with the modulus of 1.5, 1 part of modified silicon dioxide prepared in example 2, 2.5 parts of magnesium carbonate and 8 parts of jade powder into a stirring device for mixing and stirring, and adding 36 parts of water during stirring to obtain a mixed solution; adding 2 parts of TEGO810 defoaming agent, 3 parts of hydroxyethyl cellulose and 2 parts of Dego740W dispersing agent into the mixed solution, continuously stirring until the mixed coating has no obvious bubbles, adding 10 parts of sodium phosphate, 6 parts of kaolin and 6 parts of heavy calcium, and continuously stirring for 40min to obtain the finished inorganic coating.
Comparative example 4
20 parts of sodium silicate-based water glass with the modulus of 5.5, 1 part of modified silicon dioxide prepared in example 2, 2.5 parts of magnesium carbonate and 8 parts of jade powder are poured into a stirring device for mixing and stirring, and 36 parts of water is added during stirring to obtain a mixed solution; adding 2 parts of TEGO810 defoaming agent, 3 parts of hydroxyethyl cellulose and 2 parts of Dego740W dispersing agent into the mixed solution, continuously stirring until the mixed coating has no obvious bubbles, adding 10 parts of sodium phosphate, 6 parts of kaolin and 6 parts of heavy calcium, and continuously stirring for 40min to obtain the finished inorganic coating.
And (3) performance detection:
material hydrophobicity test: the coating of example 3 was applied to a flat asbestos-free fiber cement board and the contact angle of the interface of the water area coating was measured using a hydrophobic tester model PZ-200SD, as shown in fig. 1, where the contact angle was about 138 ° and the interface was hydrophobic.
And (3) testing the flushing resistance of the coating: the coatings of examples 2-7 and comparative examples 1-4 were tested as specified in GB/T9266-2009 determination of scrub resistance of architectural coatings, wherein the scrubbing medium was deionized water and the results are given in Table 1.
Table 1 results of the scrub resistance test of the paint.
Figure RE-GDA0003489747020000121
As can be seen from Table 1, the coating of the present invention has excellent washout resistance when deionized water is used as a washout medium, and the coating is broken only after more than 3800 times of washout according to GB/T9266-. The silicon dioxide in the comparative example 1 is not modified, and the scouring resistance times are only about 2700, which shows that the hydrophobicity of the hydrophobic groups in the modified silicon dioxide can effectively avoid the wetting and erosion of water to the coating in the scouring process, and the friction of the scouring is slowed down. Comparative example 2 no magnesium-containing compound was added, and the number of washing resistance was decreased, indicating the effect of the magnesium-containing compound and lithium water glass forming a three-dimensional network structure on hydrophobicity and paint stability. In contrast, comparative example 3, the modulus of the lithium silicate was 1.5, the particle size of the lithium silicate colloid was too small, the dispersion was uniform, the cohesive force was small, and it was difficult to form a network structure by bonding, so that the resistance of the coating was remarkably reduced. In comparative example 4 using sodium silicate water glass, it was difficult to achieve the washout resistance that could be achieved with lithium water glass as a coating film-forming material, even by reinforcement with modified silica or the like.
In conclusion, the inorganic waterproof flame-retardant material disclosed by the invention takes the lithium water glass with the modulus of 4.5-8.5 as a main film forming substance and combines the combined action of the modified silicon dioxide, the magnesium-containing compound and other raw materials, so that the water resistance and the scouring resistance of the coating are effectively improved, better flame retardance is provided through phosphate combination, after the inorganic waterproof flame-retardant material is coated on the surface of a wall or a building material, the wall or the building material has better high-temperature resistance, waterproof performance, fireproof performance and other performances, particularly, the damage and pulverization of a coating caused by water wetting and scouring can be reduced due to hydrophobicity, and the service life of the inorganic waterproof flame-retardant material is greatly prolonged in a humid and rainy environment.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims (10)

1. The inorganic waterproof flame-retardant coating is characterized by comprising the following components in parts by weight:
33-45 parts of water, 5-20 parts of phosphate powder, 10-40 parts of lithium water glass, 1-5 parts of magnesium-containing compound, 1-5 parts of modified silicon dioxide, 5-15 parts of jade powder, 5-8 parts of kaolin, 5-10 parts of heavy calcium carbonate, 1-4 parts of dispersing agent, 2-4 parts of thickening agent and 1-4 parts of defoaming agent.
2. The inorganic waterproof flame-retardant coating material as claimed in claim 1, which comprises the following components in parts by weight:
36-41 parts of water, 10-15 parts of phosphate powder, 15-30 parts of lithium water glass, 2-4 parts of magnesium-containing compound, 2-4 parts of modified silicon dioxide, 8-12 parts of jade powder, 6-7 parts of kaolin, 6-8 parts of heavy calcium carbonate, 2-3 parts of dispersing agent, 3-4 parts of thickening agent and 2-3 parts of defoaming agent.
3. The inorganic waterproof flame-retardant coating of claim 1, wherein the modification method of the modified silica comprises the following steps:
s31, adding ethyl orthosilicate, (2, 3-epoxypropoxy) propyl trimethoxy silane and hydrochloric acid into the ethanol solution to obtain a mixed solution;
s32 and hexadecyl trimethoxy silane are added into the mixed solution obtained in the step S31, and the mixture is stirred at room temperature to obtain the modified silicon dioxide.
4. The inorganic waterproof flame-retardant coating material of claim 3, wherein in step S32, the step of adding the hexadecyl trimethoxy silane to the mixed solution obtained in step S31 comprises:
hexadecyl trimethoxy silane with the mass of 5% of tetraethoxysilane is added into the reaction liquid obtained in the step S31, and the mixture is continuously stirred for 7 to 9 hours at room temperature; and adding 5% of hexadecyl trimethoxy silane based on the weight of the ethyl orthosilicate into the reaction liquid obtained in the step S31, and continuously stirring for 16-20h at room temperature.
5. The inorganic waterproof flame-retardant coating material of claim 3, wherein the molar ratio of the ethyl orthosilicate, the (2, 3-epoxypropoxy) propyltrimethoxysilane and the hydrochloric acid in the step S31 is 1 (0.10-0.12) to (0.008-0.01).
6. The inorganic waterproof flame-retardant coating material of claim 1, wherein the phosphate powder is one or a combination of more than two of ammonium phosphate, sodium phosphate and potassium phosphate.
7. The inorganic water-resistant flame-retardant coating as claimed in claim 1, wherein SiO in the lithium water glass2And Li2The molar ratio of O is 4.5-8.5.
8. The inorganic waterproof flame-retardant coating material as claimed in claim 1, wherein the magnesium-containing compound is one or a combination of more than two of magnesium oxide, magnesium carbonate, magnesium hydroxide, dolomite and magnesium chloride.
9. A method for preparing the inorganic water-resistant flame-retardant coating according to any one of claims 1 to 8, which comprises the following steps:
s11, pouring the lithium water glass, the modified silicon dioxide, the magnesium-containing compound and the jade powder into a stirring device for mixing and stirring, and adding water during stirring to obtain a mixed solution;
s12, adding a defoaming agent, a thickening agent and a dispersing agent into the mixed solution prepared in the S11, and continuously stirring to obtain a mixed coating;
and S13, adding kaolin and coarse whiting after the mixed coating prepared in the S12 has no obvious bubbles, and continuously stirring for 30-80min to obtain the finished product of the inorganic waterproof flame-retardant coating.
10. The method for preparing an inorganic waterproof flame-retardant coating as claimed in claim 9, wherein the rotation speed of the stirring device is controlled at 200-400r/min, and the stirring temperature is 20-30 ℃.
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CN107226925A (en) * 2017-06-09 2017-10-03 国家海洋局第三海洋研究所 A kind of high intensity hydrophobic polyethylene alcohol composite sponge preparation method
CN109054469A (en) * 2018-06-25 2018-12-21 浙江启墨新材料科技有限公司 A kind of water-proof fire-retardant flame retardant paint
CN109554006A (en) * 2018-11-15 2019-04-02 四川华邦保和涂料有限公司 A kind of preparation method with A grades of fire-proof function interior wall inorganic environment-friendly coating
CN111019416A (en) * 2019-11-12 2020-04-17 立邦涂料(四川)有限公司 Fireproof reflective heat-insulation inorganic coating for exterior wall and preparation method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107226925A (en) * 2017-06-09 2017-10-03 国家海洋局第三海洋研究所 A kind of high intensity hydrophobic polyethylene alcohol composite sponge preparation method
CN109054469A (en) * 2018-06-25 2018-12-21 浙江启墨新材料科技有限公司 A kind of water-proof fire-retardant flame retardant paint
CN109554006A (en) * 2018-11-15 2019-04-02 四川华邦保和涂料有限公司 A kind of preparation method with A grades of fire-proof function interior wall inorganic environment-friendly coating
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