CN114806249A - Building fireproof coating and preparation method thereof - Google Patents
Building fireproof coating and preparation method thereof Download PDFInfo
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- CN114806249A CN114806249A CN202210377618.4A CN202210377618A CN114806249A CN 114806249 A CN114806249 A CN 114806249A CN 202210377618 A CN202210377618 A CN 202210377618A CN 114806249 A CN114806249 A CN 114806249A
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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
- 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
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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
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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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
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- 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
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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
- 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
- C09D7/63—Additives non-macromolecular organic
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/322—Ammonium phosphate
- C08K2003/323—Ammonium polyphosphate
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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Abstract
The invention belongs to the technical field of fireproof coatings, and particularly relates to a building fireproof coating and a preparation method thereof. The product developed by the invention comprises functional filler and matrix resin; the functional filler comprises ammonium polyphosphate, melamine and titanium dioxide; the matrix resin comprises water-based acrylic resin and pentaerythritol; the fineness of the ammonium polyphosphate is 500-600 meshes; the repose angle of the ammonium polyphosphate is 25-30 degrees; the fineness of the melamine is 600-800 meshes; the melamine has an angle of repose of 28 to 32 °; the fineness of the titanium dioxide is 800-1000 meshes; the angle of repose of the titanium dioxide is 30-35 degrees; the angle of repose of the functional filler is 26-33 degrees; the mass ratio of the functional filler to the matrix resin is 1: 5-1: 10; the mass ratio of the ammonium polyphosphate to the melamine to the titanium dioxide is (1-3): (2-4): (1.2-1.8); the addition amount of the pentaerythritol is 3-8% of the mass of the water-based acrylic resin.
Description
Technical Field
The invention belongs to the technical field of fireproof coatings. More particularly, relates to a building fireproof coating and a preparation method thereof.
Background
The building fireproof coating is a coating which is sprayed on the building surface, improves the flame resistance of the building surface, reduces the propagation speed of flame, prevents combustion within a period of time, controls the spread of fire, enhances the fire resistance of a base material, delays the structural change time, protects the building and improves the fire resistance limit of building materials. Architectural fire-retardant coatings can be broadly classified into the following categories: the coating comprises a finishing type fireproof coating, a cable fireproof coating, a steel structure fireproof coating, a prestressed concrete floor fireproof coating, a high-solid fireproof coating, an environment-friendly building fireproof coating and the like. Although the fireproof coating in China starts much later than the developed national of foreign industry, the development is fast, and the fireproof coatings of individual types: for example, the technology of the steel structure fireproof coating is close to or reaches the international advanced level.
The steel structure has high building strength, light weight, good extensibility, good earthquake resistance and short construction period, and is more and more widely used in the modern building industry. However, although the steel material itself is not combustible, the strength thereof is rapidly reduced at a high temperature, and the supporting ability is rapidly lost, so that the building is deformed or collapsed. Therefore, the steel structure must be protected from fire, and the steel structure fire-retardant coating is produced at the same time.
The steel structure fireproof paint developed and produced in the early stage in the industry is mainly inorganic thick paint. The paint is a non-expansion type fire-proof paint, which is prepared by mixing silicate cement, expanded vermiculite, perlite, mineral fiber and a small amount of flame retardant, and has the advantages of no combustion and low thermal conductivity. The coating on the surface of the steel structure can play a role in isolating air and preventing a fire source from invading a base material. The coating can obviously reduce the propagation speed of flame in the initial stage of combustion, but can lose the effect once the fire is vigorous, so the coating is generally suitable for occasions with lower fire protection requirements. The fire-resistant time of the thick profile steel structure fireproof coating is related to the thickness of the coating, and the thickness of the coating is 8-50 mm.
The coating thickness of the ultrathin steel structure fireproof coating is not more than 3mm, the fire resistance limit is within 2h, and the coating meets the fireproof requirement and has a good decorative effect. The film forming material mainly comprises two types, namely resin type and emulsion type, wherein the former type comprises amino resin, epoxy resin, polyurethane and the like; the latter is such as styrene-acrylic emulsion, pure acrylic emulsion, chlorine partial emulsion, etc. The technical key point of the preparation of the ultrathin fireproof coating is the fineness of the fireproof auxiliary agent, the technology for producing the fireproof auxiliary agent with higher fineness is provided in the industry at present, the research on the superfine ammonium polyphosphate, the pentaerythritol and the melamine has already obtained stage results, the inorganic foaming material with the fineness of more than 400 meshes is put into production and use, and the research results provide favorable guarantee for the development of the ultrathin steel structure fireproof coating. However, the inventors have found that the use of ultrafine materials adversely affects the weather resistance of the product, and that the fire resistance of the coating tends to decrease with the increase in service life during long-term service.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defect and the defect that the weather resistance of the existing ultra-thin building fireproof coating cannot be effectively considered when the existing ultra-thin building fireproof coating is applied to the surface of a steel structure, and provides a building fireproof coating and a preparation method thereof.
The invention aims to provide a fireproof coating for buildings.
The invention also aims to provide a preparation method of the building fireproof coating.
The above purpose of the invention is realized by the following technical scheme:
a building fireproof coating comprises functional filler and matrix resin;
the functional filler comprises ammonium polyphosphate, melamine and titanium dioxide;
the matrix resin comprises water-based acrylic resin and pentaerythritol;
the fineness of the ammonium polyphosphate is 500-600 meshes; the repose angle of the ammonium polyphosphate is 25-30 degrees;
the fineness of the melamine is 600-800 meshes; the melamine has an angle of repose of 28 to 32 °;
the fineness of the titanium dioxide is 800-1000 meshes; the angle of repose of the titanium dioxide is 30-35 degrees;
the angle of repose of the functional filler is 26-33 degrees.
According to the technical scheme, functional fillers with different fineness and different repose angles are compounded, wherein the smaller the mesh number is, the larger the corresponding particle size is, and for ammonium polyphosphate with relatively larger particle size, the smaller the repose angle is and the smaller the repose angle is, the smaller the friction force between ammonium polyphosphate particles is; based on the above, it is speculated from the same theory that the friction force between the total particles of ammonium tripolyphosphate is relatively larger, and the friction force between the total particles of ammonium tripolyphosphate and titanium dioxide is relatively larger; the particles are relatively large, the smaller the friction force between the particles per se is, the easier the particles flow, so the surface energy is relatively low, large particles which are not easy to agglomerate can flow freely in the system more easily, the three functional fillers with different fineness are compounded, the friction force of the particles per se is different, the particles which are relatively large and not easy to agglomerate can flow easily, and the physical barrier to small particles which are easy to agglomerate can be realized, so that the particle size grading of the total functional fillers is ensured, and the uniform distribution can be realized;
in addition, after the three functional fillers are compounded, when the overall performance angle of repose is within the range, the three compounded functional fillers can be uniformly dispersed in the system in the coating mixing process and the coating film drying process under the action of the matrix resin functional group after being added into the pentaerythritol-containing water-based acrylate coating, so that a uniform-graded compact coating can be formed after the product is dried, and due to the compact forming of the coating, the adverse effect of environmental factors on a paint film in the actual use process can be effectively reduced, and the weather resistance of the product is improved.
Further, in the fireproof coating for buildings, the mass ratio of the functional filler to the matrix resin is 1: 5-1: 10;
in the functional filler, the mass ratio of the ammonium polyphosphate to the melamine to the titanium dioxide is (1-3): (2-4): (1.2-1.8);
in the matrix resin, the addition amount of the pentaerythritol is 3-8% of the mass of the water-based acrylic resin.
Through the control of the proportion, each component which is uniformly dispersed benefits from mutual physical separation in the normal use process to keep stable shape, and when a fire disaster is heated, a synergistic physical and chemical reaction can be rapidly generated, the influence of heat on base steel is slowed down, specifically, titanium dioxide and ammonium polyphosphate form a titanium pyrophosphate protective layer under the high-temperature condition, the heat insulation performance of a surface layer is improved, and under the addition of the proportion, the titanium pyrophosphate formed by the combined reaction of the titanium dioxide and the ammonium polyphosphate enables an expanded carbon layer to be compact, and the heat insulation performance of the surface layer is further improved.
Further, the angle of repose of the functional filler is 28-30.
Furthermore, the building fireproof coating also comprises a lubricant accounting for 5-10% of the mass of the titanium dioxide;
the lubricant is selected from any one of calcium stearate, zinc stearate and magnesium stearate.
A preparation method of a building fireproof coating comprises the following specific preparation steps:
providing ammonium polyphosphate with the fineness of 500-600 meshes and the angle of repose of 25-30 ℃;
providing melamine with the fineness of 600-800 meshes and the angle of repose of 28-32 ℃;
providing titanium dioxide with the fineness of 800-1000 meshes and the angle of repose of 30-35 ℃;
adding the ammonium polyphosphate, the melamine and the titanium dioxide into a ball milling tank, adding a grinding aid, and ball milling and mixing until a ball milling material with an angle of repose of 26-33 degrees is obtained to obtain a functional filler;
and uniformly mixing the functional filler, pentaerythritol and water-based acrylate to obtain the building fireproof coating.
Further, the specific preparation steps further comprise:
and adding a lubricant which accounts for 5-10% of the mass of the titanium dioxide while adding the grinding aid, wherein the lubricant is selected from any one of calcium stearate, zinc stearate and magnesium stearate.
Detailed Description
The present invention is further illustrated by the following specific examples, which are not intended to limit the invention in any way. Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
Unless otherwise indicated, reagents and materials used in the following examples are commercially available.
Example 1
Providing ammonium polyphosphate with the fineness of 500 meshes and the repose angle of 25 degrees;
providing melamine with the fineness of 600 meshes and the repose angle of 28 degrees;
providing titanium dioxide with the fineness of 800 meshes and the repose angle of 30 degrees;
adding the ammonium polyphosphate, the melamine and the titanium dioxide into a ball milling tank, wherein the mass ratio of the ammonium polyphosphate to the melamine to the titanium dioxide is 1: 2: 1.2, adding absolute ethyl alcohol as a grinding aid, wherein the dosage of the absolute ethyl alcohol is 10 percent of the total mass of the three fillers in the ball milling tank, then adding a lubricant accounting for 5 percent of the mass of the titanium dioxide, and then adding the mixture of the three fillers according to the mass ratio of 20: 1 adding ball milling beads, and ball milling and mixing the ball milling beads until the ball milling material has an angle of repose of 26 degrees at the rotation speed of 300r/min and the revolution speed of 400r/min to obtain a functional filler;
wherein the lubricant is selected from calcium stearate;
adding pentaerythritol with the mass of 3 percent of the water-based acrylate emulsion into the water-based acrylate emulsion with the solid content of 50 percent, and stirring and mixing for 45min by using a stirrer at the rotating speed of 500r/min to obtain matrix resin;
according to the mass ratio of 1: 5, mixing the functional filler and the matrix resin, pouring the mixture into a high-pressure homogenizer, adding defoamer polysiloxane with the mass of 0.3 percent of the matrix resin, homogenizing the mixture for 2 hours at the rotating speed of 8000r/min, and discharging the mixture to obtain the product.
Example 2
Providing ammonium polyphosphate with the fineness of 550 meshes and the angle of repose of 26 degrees;
providing melamine with the fineness of 700 meshes and the repose angle of 29 degrees;
providing titanium dioxide with the fineness of 900 meshes and the angle of repose of 32 degrees;
adding the ammonium polyphosphate, the melamine and the titanium dioxide into a ball milling tank, wherein the mass ratio of the ammonium polyphosphate to the melamine to the titanium dioxide is 2: 3: 1.5, adding absolute ethyl alcohol as a grinding aid, wherein the dosage of the absolute ethyl alcohol is 12 percent of the total mass of the three fillers in the ball milling tank, then adding a lubricant accounting for 8 percent of the mass of the titanium dioxide, and then adding the mixture of the three fillers according to the mass ratio of 25: 1 adding ball milling beads, and ball milling and mixing the ball milling beads until the ball milling material has an angle of repose of 28 degrees at the autorotation speed of 400r/min and the revolution speed of 500r/min to obtain a functional filler;
wherein the lubricant is selected from zinc stearate;
adding pentaerythritol with the mass of 5 percent of the water-based acrylate emulsion into the water-based acrylate emulsion with the solid content of 55 percent, and stirring and mixing for 50min by using a stirrer at the rotating speed of 600r/min to obtain matrix resin;
according to the mass ratio of 1: 8, mixing the functional filler and the matrix resin, pouring the mixture into a high-pressure homogenizer, adding defoamer polysiloxane with the mass of 0.4% of the matrix resin, homogenizing the mixture for 3 hours at the rotation speed of 8300r/min, and discharging the mixture to obtain the product.
Example 3
Providing ammonium polyphosphate with the fineness of 600 meshes and the repose angle of 30 degrees;
providing melamine with the fineness of 800 meshes and the repose angle of 32 degrees;
providing titanium dioxide with the fineness of 1000 meshes and the repose angle of 35 degrees;
adding the ammonium polyphosphate, the melamine and the titanium dioxide into a ball milling tank, wherein the mass ratio of the ammonium polyphosphate to the melamine to the titanium dioxide is 3: 4: 1.8, adding absolute ethyl alcohol as a grinding aid, wherein the dosage of the absolute ethyl alcohol is 15 percent of the total mass of the three fillers in the ball milling tank, then adding a lubricant accounting for 10 percent of the mass of the titanium dioxide, and then adding the mixture of the three fillers according to the mass ratio of the ball materials of 30: 1 adding ball milling beads, and ball milling and mixing the ball milling beads until the ball milling material has an angle of repose of 33 degrees at the rotation speed of 500r/min and the revolution speed of 600r/min to obtain a functional filler;
wherein the lubricant is selected from magnesium stearate;
adding pentaerythritol with the mass of 8 percent of the mass of the water-based acrylate emulsion into the water-based acrylate emulsion with the solid content of 60 percent, and stirring and mixing for 60min by using a stirrer at the rotating speed of 700r/min to obtain matrix resin;
according to the mass ratio of 1: 10 mixing the functional filler and the matrix resin, pouring the mixture into a high-pressure homogenizer, adding defoaming agent polysiloxane with the mass of 0.5 percent of the matrix resin, homogenizing the mixture for 4 hours at the rotating speed of 8500r/min, and discharging the mixture to obtain the product.
Example 4
Providing ammonium polyphosphate with the fineness of 500 meshes and the repose angle of 25 degrees;
providing melamine with the fineness of 600 meshes and the repose angle of 28 degrees;
providing titanium dioxide with the fineness of 800 meshes and the repose angle of 30 degrees;
adding the ammonium polyphosphate, the melamine and the titanium dioxide into a ball milling tank, wherein the mass ratio of the ammonium polyphosphate to the melamine to the titanium dioxide is 1: 2: 1.2, adding absolute ethyl alcohol as a grinding aid, wherein the dosage of the absolute ethyl alcohol is 10 percent of the total mass of the three fillers in the ball milling tank, then adding a lubricant accounting for 5 percent of the mass of the titanium dioxide, and then adding the mixture of the three fillers according to the mass ratio of 20: 1 adding ball milling beads, and ball milling and mixing the ball milling beads until the ball milling material has an angle of repose of 29 degrees at the rotation speed of 300r/min and the revolution speed of 400r/min to obtain a functional filler;
wherein the lubricant is selected from calcium stearate;
adding pentaerythritol with the mass of 3 percent of the water-based acrylate emulsion into the water-based acrylate emulsion with the solid content of 50 percent, and stirring and mixing for 45min by using a stirrer at the rotating speed of 500r/min to obtain matrix resin;
according to the mass ratio of 1: 5, mixing the functional filler and the matrix resin, pouring the mixture into a high-pressure homogenizer, adding defoamer polysiloxane with the mass of 0.3 percent of the matrix resin, homogenizing the mixture for 2 hours at the rotating speed of 8000r/min, and discharging the mixture to obtain the product.
Example 5
Providing ammonium polyphosphate with the fineness of 550 meshes and the angle of repose of 26 degrees;
providing melamine with the fineness of 700 meshes and the repose angle of 29 degrees;
providing titanium dioxide with the fineness of 900 meshes and the angle of repose of 32 degrees;
adding the ammonium polyphosphate, the melamine and the titanium dioxide into a ball milling tank, wherein the mass ratio of the ammonium polyphosphate to the melamine to the titanium dioxide is 2: 3: 1.5, adding absolute ethyl alcohol as a grinding aid, wherein the dosage of the absolute ethyl alcohol is 12 percent of the total mass of the three fillers in the ball milling tank, then adding a lubricant accounting for 8 percent of the mass of the titanium dioxide, and then adding the mixture of the three fillers according to the mass ratio of 25: 1 adding ball grinding beads, and ball-milling and mixing to obtain ball grinding materials with an angle of repose of 30 degrees at a rotation speed of 400r/min and a revolution speed of 500r/min to obtain the functional filler;
wherein the lubricant is selected from zinc stearate;
adding pentaerythritol with the mass of 5 percent of the water-based acrylate emulsion into the water-based acrylate emulsion with the solid content of 55 percent, and stirring and mixing for 50min by using a stirrer at the rotating speed of 600r/min to obtain matrix resin;
according to the mass ratio of 1: 8, mixing the functional filler and the matrix resin, pouring the mixture into a high-pressure homogenizer, adding defoaming agent polysiloxane with the mass of 0.4 percent of the matrix resin, homogenizing the mixture for 3 hours at the rotating speed of 8300r/min, and discharging the mixture to obtain the product.
Example 6
This example differs from example 1 in that: no lubricant was added and the remaining conditions were kept constant.
Comparative example 1
Providing ammonium polyphosphate with fineness of 400 meshes and an angle of repose of 35 degrees;
providing melamine with the fineness of 600 meshes and the repose angle of 28 degrees;
providing titanium dioxide with the fineness of 800 meshes and the repose angle of 30 degrees;
adding the ammonium polyphosphate, the melamine and the titanium dioxide into a ball milling tank, wherein the mass ratio of the ammonium polyphosphate to the melamine to the titanium dioxide is 1: 2: 1.2, adding absolute ethyl alcohol as a grinding aid, wherein the dosage of the absolute ethyl alcohol is 10 percent of the total mass of the three fillers in the ball milling tank, then adding a lubricant accounting for 5 percent of the mass of the titanium dioxide, and then adding the mixture of the three fillers according to the mass ratio of 20: 1 adding ball milling beads, and ball milling and mixing the ball milling beads until the ball milling material has an angle of repose of 26 degrees at the rotation speed of 300r/min and the revolution speed of 400r/min to obtain a functional filler;
wherein the lubricant is selected from calcium stearate;
adding pentaerythritol with the mass of 3 percent of the water-based acrylate emulsion into the water-based acrylate emulsion with the solid content of 50 percent, and stirring and mixing for 45min by using a stirrer at the rotating speed of 500r/min to obtain matrix resin;
according to the mass ratio of 1: 5, mixing the functional filler and the matrix resin, pouring the mixture into a high-pressure homogenizer, adding defoamer polysiloxane with the mass of 0.3 percent of the matrix resin, homogenizing the mixture for 2 hours at the rotating speed of 8000r/min, and discharging the mixture to obtain the product.
Comparative example 2
Providing ammonium polyphosphate with the fineness of 500 meshes and the repose angle of 25 degrees;
providing melamine with the fineness of 300 meshes and the repose angle of 40 degrees;
providing titanium dioxide with the fineness of 800 meshes and the repose angle of 30 degrees;
adding the ammonium polyphosphate, the melamine and the titanium dioxide into a ball milling tank, wherein the mass ratio of the ammonium polyphosphate to the melamine to the titanium dioxide is 1: 2: 1.2, adding absolute ethyl alcohol as a grinding aid, wherein the dosage of the absolute ethyl alcohol is 10 percent of the total mass of the three fillers in the ball milling tank, then adding a lubricant accounting for 5 percent of the mass of the titanium dioxide, and then adding the mixture of the three fillers according to the mass ratio of 20: 1 adding ball milling beads, and ball milling and mixing the ball milling beads until the ball milling material has an angle of repose of 26 degrees at the rotation speed of 300r/min and the revolution speed of 400r/min to obtain a functional filler;
wherein the lubricant is selected from calcium stearate;
adding pentaerythritol with the mass of 3 percent of the water-based acrylate emulsion into the water-based acrylate emulsion with the solid content of 50 percent, and stirring and mixing for 45min by using a stirrer at the rotating speed of 500r/min to obtain matrix resin;
according to the mass ratio of 1: 5, mixing the functional filler and the matrix resin, pouring the mixture into a high-pressure homogenizer, adding defoamer polysiloxane with the mass of 0.3 percent of the matrix resin, homogenizing the mixture for 2 hours at the rotating speed of 8000r/min, and discharging the mixture to obtain the product.
Comparative example 3
Providing ammonium polyphosphate with the fineness of 500 meshes and the repose angle of 25 degrees;
providing melamine with the fineness of 600 meshes and the repose angle of 28 degrees;
providing titanium dioxide with the fineness of 800 meshes and the angle of repose of 42 degrees;
adding the ammonium polyphosphate, the melamine and the titanium dioxide into a ball milling tank, wherein the mass ratio of the ammonium polyphosphate to the melamine to the titanium dioxide is 1: 2: 1.2, adding absolute ethyl alcohol as a grinding aid, wherein the dosage of the absolute ethyl alcohol is 10 percent of the total mass of the three fillers in the ball milling tank, then adding a lubricant accounting for 5 percent of the mass of the titanium dioxide, and then adding the mixture of the three fillers according to the mass ratio of 20: 1 adding ball grinding beads, and ball-milling and mixing to obtain ball grinding materials with an angle of repose of 32 degrees at a rotation speed of 300r/min and a revolution speed of 400r/min to obtain the functional filler;
wherein the lubricant is selected from calcium stearate;
adding pentaerythritol with the mass of 3 percent of the water-based acrylate emulsion into the water-based acrylate emulsion with the solid content of 50 percent, and stirring and mixing for 45min by using a stirrer at the rotating speed of 500r/min to obtain matrix resin;
according to the mass ratio of 1: 5, mixing the functional filler and the matrix resin, pouring the mixture into a high-pressure homogenizer, adding defoaming agent polysiloxane with the mass of 0.3 percent of the matrix resin, homogenizing the mixture for 2 hours at the rotating speed of 8000r/min, and discharging the mixture to obtain the product.
Comparative example 4
Providing ammonium polyphosphate with the fineness of 500 meshes and the repose angle of 25 degrees;
providing melamine with the fineness of 600 meshes and the repose angle of 28 degrees;
providing titanium dioxide with the fineness of 800 meshes and the repose angle of 30 degrees;
adding the ammonium polyphosphate, the melamine and the titanium dioxide into a ball milling tank, wherein the mass ratio of the ammonium polyphosphate to the melamine to the titanium dioxide is 1: 2: 1.2, adding absolute ethyl alcohol as a grinding aid, wherein the dosage of the absolute ethyl alcohol is 10 percent of the total mass of the three fillers in the ball milling tank, then adding a lubricant accounting for 5 percent of the mass of the titanium dioxide, and then adding the mixture of the three fillers according to the mass ratio of 20: 1 adding ball milling beads, and ball milling and mixing the ball milling beads until an angle of repose is 36 degrees at a rotation speed of 300r/min and a revolution speed of 400r/min to obtain a functional filler;
wherein the lubricant is selected from calcium stearate;
adding pentaerythritol with the mass of 3 percent of the water-based acrylate emulsion into the water-based acrylate emulsion with the solid content of 50 percent, and stirring and mixing for 45min by using a stirrer at the rotating speed of 500r/min to obtain matrix resin;
according to the mass ratio of 1: 5, mixing the functional filler and the matrix resin, pouring the mixture into a high-pressure homogenizer, adding defoamer polysiloxane with the mass of 0.3 percent of the matrix resin, homogenizing the mixture for 2 hours at the rotating speed of 8000r/min, and discharging the mixture to obtain the product.
The products obtained in examples 1 to 6 and comparative examples 1 to 4 were subjected to a performance test, the specific test method being as follows:
selecting a Q235B steel plate with the specification of 300mm multiplied by 3mm, polishing and cleaning, brushing a primer, after the primer is dried and cured, sequentially coating the products of the above examples or comparative examples on the surfaces of different steel plates, wherein the thickness of the coating is 1.5mm, the relative humidity is 50% at room temperature, after curing for 30d, moving the steel plates to a vigorous fire furnace, placing a thermocouple in the middle of the back of the steel plates, testing the back temperature of the steel plates, igniting to perform a fire resistance experiment, stopping the experiment when the back temperature of the steel plates reaches 550 ℃, and calculating the time required for reaching the temperature, namely t 1;
placing the cured steel plate in an accelerated aging test box, continuously irradiating for 15d by using ultraviolet light of 300-365nm by using a UVA-340 lamp tube at the temperature of 42 ℃ and the relative humidity of 65%, and then testing by using the consistent fire resistance test again to obtain corresponding time t 2;
specific test results are shown in table 1;
table 1: product performance test results
| t1/s | t2/s | |
| Example 1 | 125 | 120 |
| Example 2 | 132 | 130 |
| Example 3 | 130 | 124 |
| Example 4 | 135 | 132 |
| Example 5 | 138 | 133 |
| Example 6 | 120 | 114 |
| Comparative example 1 | 105 | 95 |
| Comparative example 2 | 101 | 89 |
| Comparative example 3 | 92 | 80 |
| Comparative example 4 | 93 | 78 |
The test results in table 1 show that the product obtained by the invention can be used on the surface of steel to obtain longer fire resistance time, and still keeps better fire resistance after aging, and has certain weather resistance.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (6)
1. The building fireproof paint is characterized by comprising functional filler and matrix resin;
the functional filler comprises ammonium polyphosphate, melamine and titanium dioxide;
the matrix resin comprises water-based acrylic resin and pentaerythritol;
the fineness of the ammonium polyphosphate is 500-600 meshes; the repose angle of the ammonium polyphosphate is 25-30 degrees;
the fineness of the melamine is 600-800 meshes; the melamine has an angle of repose of 28 to 32 °;
the fineness of the titanium dioxide is 800-1000 meshes; the angle of repose of the titanium dioxide is 30-35 degrees;
the angle of repose of the functional filler is 26-33 degrees.
2. The architectural fire retardant coating of claim 1,
in the building fireproof coating, the mass ratio of the functional filler to the matrix resin is 1: 5-1: 10;
in the functional filler, the mass ratio of the ammonium polyphosphate to the melamine to the titanium dioxide is (1-3): (2-4): (1.2-1.8);
in the matrix resin, the addition amount of the pentaerythritol is 3-8% of the mass of the water-based acrylic resin.
3. The architectural fire retardant coating of claim 1,
the angle of repose of the functional filler is 28-30.
4. The architectural fire retardant coating of claim 1,
the building fireproof coating also comprises a lubricant accounting for 5-10% of the weight of the titanium dioxide;
the lubricant is selected from any one of calcium stearate, zinc stearate and magnesium stearate.
5. The preparation method of the building fireproof coating is characterized by comprising the following specific preparation steps:
providing ammonium polyphosphate with the fineness of 500-600 meshes and the angle of repose of 25-30 ℃;
providing melamine with the fineness of 600-800 meshes and the angle of repose of 28-32 ℃;
providing titanium dioxide with the fineness of 800-1000 meshes and the angle of repose of 30-35 ℃;
adding the ammonium polyphosphate, the melamine and the titanium dioxide into a ball milling tank, adding a grinding aid, and ball milling and mixing until a ball milling material with an angle of repose of 26-33 degrees is obtained to obtain a functional filler;
and uniformly mixing the functional filler, pentaerythritol and water-based acrylate to obtain the building fireproof coating.
6. The preparation method of the architectural fireproof coating according to claim 5, wherein the specific preparation steps further comprise:
and adding a lubricant which accounts for 5-10% of the mass of the titanium dioxide while adding the grinding aid, wherein the lubricant is selected from any one of calcium stearate, zinc stearate and magnesium stearate.
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