CN115537099A - Water-based intumescent fire retardant coating for outdoor steel structure and preparation method thereof - Google Patents

Water-based intumescent fire retardant coating for outdoor steel structure and preparation method thereof Download PDF

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CN115537099A
CN115537099A CN202211181393.1A CN202211181393A CN115537099A CN 115537099 A CN115537099 A CN 115537099A CN 202211181393 A CN202211181393 A CN 202211181393A CN 115537099 A CN115537099 A CN 115537099A
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water
emulsion
coating
stirring
retardant coating
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黄明君
田尔布
曾武华
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Sanming University
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Sanming University
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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
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • 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
    • C09D5/185—Intumescent 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
    • 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
    • C09D7/65—Additives macromolecular
    • 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
    • C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
    • C—CHEMISTRY; METALLURGY
    • 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
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C08K2003/0856—Iron
    • C—CHEMISTRY; METALLURGY
    • 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
    • C—CHEMISTRY; METALLURGY
    • 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
    • C08K3/32—Phosphorus-containing compounds
    • C08K2003/321—Phosphates
    • C08K2003/322—Ammonium phosphate
    • C08K2003/323—Ammonium polyphosphate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
    • C08L2205/16—Fibres; Fibrils
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Abstract

The invention provides a water-based intumescent fire-retardant coating for an outdoor steel structure and a preparation method thereof, and the coating comprises, by weight, 15% -20% of deionized water, 8% -11.2% of ammonium polyphosphate, 5% -7% of melamine, 10% -14% of pentaerythritol, 10% -13% of a mixture of polyacrylate emulsion and epoxy resin emulsion, 2% -4% of titanium dioxide, 2% -4% of kaolin, 4% -6% of water-soluble polyvinyl alcohol fiber, 15% -19% of expandable graphite, 2% -4% of wollastonite powder, 2% -4% of quartz powder, 5% -7% of steel slag micropowder, 6% -8% of aluminum hydroxide and 1% -2% of other additives. The invention takes the water-soluble polyvinyl alcohol fiber as the binder, and can effectively reduce the micro-cracks inside and outside the foaming tissue of the fireproof coating. The steel slag micro powder is used as a film forming base material, so that the later strength of the coating can be improved, and the defect that the cement-based coating is easy to crack is overcome. The wollastonite powder can improve the physical and chemical properties of the coating and enhance the expansion capability and corrosion resistance of the coating. The quartz powder can improve the weather resistance of the fireproof coating. The mixture of polyacrylate emulsion and epoxy resin emulsion as film forming emulsion can improve the flexibility and impact resistance of the film.

Description

Water-based intumescent fire retardant coating for outdoor steel structure and preparation method thereof
Technical Field
The invention relates to the technical field of fireproof coatings, and particularly relates to a water-based intumescent fireproof coating for an outdoor steel structure and a preparation method thereof.
Background
The steel material is a non-combustible building material and has the characteristics of earthquake resistance, bending resistance and the like. The steel material can relatively increase the load capacity of buildings, meet the requirement of aesthetic appearance and shape of building design, and avoid the defects that the building materials such as concrete and the like cannot bend and stretch. Therefore, the steel has wide application in the building industry. However, steel as a building material has some inevitable defects in fire protection, such as a sharp decrease in mechanical properties (yield point, tensile strength, and elastic modulus) due to an increase in temperature.
In practical application, the fire-proof treatment can overcome the defects of the steel structure material in fire prevention. For applications, stainless steel fireproof materials can be classified into indoor types and outdoor types. The outdoor steel structure fireproof coating has higher index requirements than indoor steel structure materials, such as exposure resistance, damp-heat resistance, freeze-thaw cycle resistance, acid and alkali resistance, salt mist corrosion resistance and the like. However, the existing traditional steel structure fireproof paint has the problems of poor adhesion, difficulty in taking moisture resistance, water resistance and flame retardance into consideration, and the like, so that the requirement on the aspect of outdoor steel structure fire prevention cannot be met.
Disclosure of Invention
The invention aims to provide a water-based intumescent fire retardant coating for an outdoor steel structure, which has the properties of good adhesive force, weather resistance, flexibility, impact resistance and the like.
The invention also aims to provide a preparation method of the water-based intumescent fire retardant coating for the outdoor steel structure, which is simple to operate, controllable in parameters and suitable for industrial large-scale production.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The invention provides a water-based intumescent fire retardant coating for an outdoor steel structure, which is characterized by comprising the following components in percentage by weight: 15-20% of deionized water, 8-11.2% of ammonium polyphosphate (APP), 5-7% of Melamine (MEL), 10-14% of Pentaerythritol (PER), 10-13% of a mixture of polyacrylate emulsion and epoxy resin emulsion, 2-4% of titanium dioxide, 2-4% of kaolin, 4-6% of water-soluble polyvinyl alcohol (PVA), 15-19% of expandable graphite, 2-4% of wollastonite powder, 2-4% of quartz powder, 5-7% of steel slag micropowder, 6-8% of aluminum hydroxide and 1-2% of other additives.
The invention provides a preparation method of a water-based intumescent fire retardant coating for an outdoor steel structure, which comprises the following steps:
s1, weighing the components according to the mass percentage of the water-based intumescent fire-retardant coating for the outdoor steel structure, and then adding the water-soluble polyvinyl alcohol fiber into the distilled water and uniformly stirring to obtain a polyvinyl alcohol aqueous solution;
s2, adding the aluminum hydroxide, the titanium dioxide, the kaolin, the wollastonite powder, the quartz powder, the steel slag micro powder, the dispersing agent and the defoaming agent into the polyvinyl alcohol aqueous solution, and stirring to obtain a first mixed solution;
s3, adding the ammonium polyphosphate, the melamine, the pentaerythritol and the expandable graphite into the first mixed solution, and stirring to obtain a second mixed solution;
and S4, adding the mixture of the polyacrylate emulsion and the epoxy emulsion into the second mixed solution, stirring, and adding a thickening agent to obtain the water-based intumescent fire-retardant coating.
The water-based intumescent fire retardant coating for the outdoor steel structure and the preparation method thereof have the beneficial effects that:
1. the invention uses water-soluble polyvinyl alcohol fiber as a binder. Because PVA has good cohesiveness and film forming property, the mechanical property of the formed film is excellent, and the tensile strength is obviously improved, thereby effectively reducing the micro-cracks inside and outside the foaming tissue of the fireproof coating.
2. The invention adopts the steel slag micro powder to replace Portland cement as an inorganic film-forming base material, the steel slag has a phase composition similar to that of the cement, and comprises C 2 S、C 3 S, etc., has potential gelling activity and hydraulicity. By mechanically grinding the steel slag to an ultra-fine powder (D50. Ltoreq. 50 μm), free CaO contained in the steel slag is released, and the hydration activity index of the steel slag increases as the particle size decreases. The steel slag micro powder hydration reaction has the characteristics of low early strength, slow hydration speed and long setting time, and can continue to carry out secondary hydration reaction after the coating is put on the wall, thereby improving the later strength of the coating and improving the defect that the cement-based coating is easy to crack.
3. The pigment and filler of the invention comprises titanium dioxide, kaolin, wollastonite powder and quartz powder. The titanium dioxide and the kaolin are used together to play a role of an extender so as to improve the covering power of the paint. The wollastonite powder can improve the physical and chemical properties of the coating, and enhance the expansion capability and corrosion resistance of the coating, thereby reducing cracks and oil absorption. The quartz powder can improve the weather resistance of the fireproof coating. The flexibility and impact resistance of the coating film can be improved by using the mixture of polyacrylate emulsion and epoxy resin emulsion as the film-forming emulsion.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a flow chart of a preparation process of an aqueous intumescent fire retardant coating for an outdoor steel structure according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The following is a detailed description of the water-based intumescent fire retardant coating for outdoor steel structures and the preparation method thereof according to the embodiment of the invention.
The embodiment of the invention provides a water-based intumescent fire retardant coating for an outdoor steel structure, which is characterized by comprising the following components in percentage by weight: 15-20% of deionized water, 8-11.2% of ammonium polyphosphate, 5-7% of melamine, 10-14% of pentaerythritol, 10-13% of a mixture of polyacrylate emulsion and epoxy resin emulsion, 2-4% of titanium dioxide, 2-4% of kaolin, 4-6% of water-soluble polyvinyl alcohol fiber, 15-19% of expandable graphite, 2-4% of wollastonite powder, 2-4% of quartz powder, 5-7% of steel slag micropowder, 6-8% of aluminum hydroxide and 1-2% of other additives.
The invention takes water-soluble polyvinyl alcohol fiber as a binder, and the chemical formula of the water-soluble polyvinyl alcohol fiber is [ C ] 2 H 4 O] n The main structure is 1,3-propanediol. The longitudinal structure surface of PVA is smooth, the thickness is even, its horizontal cross-section is close to the circular, is obvious skin-core structure. The PVA dissolving process comprises two processes of broad swelling and dissolving and dispersing: in distilled water at 70-90 ℃, water molecules penetrate into a PVA amorphous region, and meanwhile, the water molecules are subjected to the affinity action of hydroxyl groups in polyvinyl alcohol molecules, so that the fibers expand transversely and contract longitudinally. If the water temperature is continuously increased, the PVA fiber is dissolved into colloidal small fragments, and the water temperature is further increased or the treatment time is prolonged, the polyvinyl alcohol is dissolved and dispersed in a molecular form to form a uniform solution. The PVA has good cohesiveness and film forming property, the mechanical property of the formed film is excellent, the tensile strength is obviously improved, and the micro-cracks inside and outside the foaming tissue of the fireproof coating are effectively reduced.
The invention adopts the steel slag micro powder to replace Portland cement as an inorganic film-forming base material, the steel slag has a phase composition similar to that of the cement, and comprises C 2 S、C 3 S, etc., has potential gelling activity and hydraulicity. Passing machineThe steel slag is mechanically ground to ultra-fine powder (D50 is less than or equal to 50 mu m), free CaO contained in the steel slag is released, and the hydration activity index of the steel slag is increased along with the reduction of the granularity. The steel slag micro powder hydration reaction has the characteristics of low early strength, slow hydration speed and long setting time, and can continue to carry out secondary hydration reaction after the coating is put on the wall, thereby improving the later strength of the coating and improving the defect that the cement-based coating is easy to crack.
The pigment and filler of the invention comprises titanium dioxide, kaolin, wollastonite powder and quartz powder. The titanium dioxide and the kaolin are used together to play a role of an extender so as to improve the covering power of the coating. The wollastonite powder can improve the physical and chemical properties of the coating, and enhance the expansion capability and corrosion resistance of the coating, thereby reducing cracks and oil absorption. The quartz powder can improve the weather resistance of the fireproof coating. The flexibility and impact resistance of the coating film can be improved by using the mixture of polyacrylate emulsion and epoxy resin emulsion as the film-forming emulsion.
Further, in the preferred embodiment of the present invention, the water-soluble polyvinyl alcohol fiber of the present invention is a water-soluble polyvinyl alcohol fiber of yongbao Hualin. The product characteristics are as follows: the dissolving temperature of the water-soluble polyvinyl alcohol fiber in water is 70-90 ℃. The content of insoluble fiber at the water temperature of 95 ℃ is less than or equal to 0.5 percent, the deviation rate of linear density is +/-8 percent, the deviation rate of length is +/-6 percent, the dry breaking strength is more than or equal to 3.8CN, the dry breaking elongation is 23 +/-5 percent, the foreign fiber is less than or equal to 20.0mg/100g, the number of crimps is more than or equal to 3.5/25 mm, and the oiling rate is more than or equal to 0.1 percent.
Further, in the preferred embodiment of the invention, the specific surface area of the steel slag micro powder is more than or equal to 550m 2 Kg, density not less than 3.2g/cm 3 The water content is less than or equal to 1.0 percent, the free calcium oxide content is less than or equal to 4.0 percent, the sulfur trioxide content is less than or equal to 4.0 percent, and the chloride ion content is less than or equal to 0.06 percent.
Further, in a preferred embodiment of the present invention, the other additives include a thickener, a dispersant and an antifoaming agent, wherein the thickener is bentonite, the dispersant is sodium polyacrylate 731A, and the antifoaming agent is polypropylene glycol PPG-400.
Referring to fig. 1, the invention also provides a preparation method of the water-based intumescent fire retardant coating for the outdoor steel structure, which comprises the following steps:
s1, weighing the components according to the mass percentage of the water-based intumescent fire retardant coating for the outdoor steel structure, and then adding the water-soluble polyvinyl alcohol fiber into the distilled water and uniformly stirring to obtain a polyvinyl alcohol aqueous solution. The water-soluble polyvinyl alcohol fiber is dissolved in advance, so that the situation that when the water-soluble polyvinyl alcohol fiber and the pigment and filler are added simultaneously, the water-soluble polyvinyl alcohol fiber is not easy to disperse and even forms defects in the coating because PVA is easily wrapped by the pigment and filler can be avoided.
Further, in a preferred embodiment of the present invention, the temperature of the distilled water is 70 to 90 ℃. The stirring speed is 800-1000 r/min, and the stirring time is 5-15 min.
S2, adding the aluminum hydroxide, the titanium dioxide, the kaolin, the wollastonite powder, the quartz powder, the steel slag micro powder, the dispersing agent and the defoaming agent into the polyvinyl alcohol aqueous solution, and stirring to obtain a first mixed solution. Pentaerythritol and melamine are dispersed in water to have a quick swelling effect, so that the effects of pseudo-thickening and high-shear thinning of the system can be caused. Therefore, the preparation process selects to add the pigment and the filler to dilute the water so as to reduce the pseudo-thickening effect. In an aqueous medium, the dispersion process of the pigment and filler comprises three mutually synergistic processes of wetting, separation and stabilization. In the pulping process, the pigment and the filler are not easy to be wetted by water, are easy to generate clusters, and cannot be added with powder in the designed amount, while the emulsion cannot be added in the pulping stage so as to prevent emulsion breaking during stirring. Therefore, a dispersant is added to solve the problem of dispersion of the pigment and filler.
Further, in the preferred embodiment of the invention, the stirring speed is 1000-1200 r/min, and the stirring time is 15-25 min.
And S3, adding the ammonium polyphosphate, the melamine, the pentaerythritol and the expandable graphite into the first mixed solution, and stirring to obtain a second mixed solution.
Further, in the preferred embodiment of the invention, the stirring speed is 1000-1200 r/min, and the stirring time is 15-20 min.
And S4, adding the mixture of the polyacrylate emulsion and the epoxy emulsion into the second mixed solution, stirring, and adding a thickening agent to obtain the water-based intumescent fire retardant coating. In order to prevent emulsion breaking, the emulsion needs to be stirred and dispersed at low shear, so that the powder raw material components are uniformly dispersed at high shear in water at the early stage, and then the emulsion is added and stirred at low shear.
Further, in a preferred embodiment of the present invention, the step of preparing the mixture of polyacrylate emulsion and epoxy emulsion comprises: mixing polyacrylate emulsion and epoxy emulsion at 65-85 deg.c in the ratio of 1: 6.8-7.2 to obtain the mixture of the polyacrylate emulsion and the epoxy emulsion. Preferably, the polyacrylate emulsion and the epoxy emulsion are mixed at a temperature of 65 to 85 ℃ in a ratio of 1:7 to obtain a mixture of polyacrylate emulsion and epoxy emulsion.
Further, in the preferred embodiment of the present invention, the stirring speed is 600-800 r/min, and the stirring time is 10-15 min.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The embodiment provides a water-based intumescent fire retardant coating for an outdoor steel structure, which is prepared according to the following method:
(1) 5% PVA was added to 85 ℃ distilled water, and the mixture was stirred at 1000r/min for 10min to dissolve it sufficiently.
(2) Adding 8% of aluminum hydroxide, 3% of titanium dioxide, 3% of kaolin, 4% of wollastonite powder, 4% of quartz powder, 6% of steel slag micro powder, 0.25% of dispersing agent and 0.25% of defoaming agent, and stirring at the rotating speed of 1000r/min for 20min.
(3) Then 8 percent of ammonium polyphosphate, 5 percent of melamine, 10 percent of pentaerythritol and 15 percent of expandable graphite are added, and the mixture is continuously stirred for 15 to 20min.
(4) After being stirred evenly, 13 percent of mixture of polyacrylate emulsion and epoxy emulsion is added, and the mixture is stirred for 10 to 15mim at the rotating speed of 800 r/min. The preparation method of the mixture of the polyacrylate emulsion and the epoxy emulsion comprises the following steps: mixing 1.63% polyacrylate emulsion and 11.38% epoxy resin emulsion, heating to 85 deg.C, and stirring at 600-800 r/min for 40min.
(5) And finally, adding 0.5% of thickening agent to adjust the viscosity, thereby obtaining the water-based intumescent fire retardant coating.
Example 2
The embodiment provides a water-based intumescent fire retardant coating for an outdoor steel structure, which is prepared according to the following method:
(1) 6% PVA was added to 85 ℃ distilled water, and the mixture was sufficiently dissolved by stirring at 800r/min for 10 min.
(2) Adding 6% of aluminum hydroxide, 2% of titanium dioxide, 2% of kaolin, 3% of wollastonite powder, 3% of quartz powder, 5% of steel slag micro powder, 0.5% of dispersing agent and 0.5% of defoaming agent, and stirring at the rotating speed of 1000r/min for 20min.
(3) Then 10 percent of ammonium polyphosphate, 6.25 percent of melamine, 12.5 percent of pentaerythritol and 17 percent of expandable graphite are added, and the mixture is continuously stirred for 20min.
(4) After stirring evenly, adding 10 percent of mixture of polyacrylate emulsion and epoxy emulsion, and stirring at the rotating speed of 800r/min for 15mim. The preparation method of the mixture of the polyacrylate emulsion and the epoxy emulsion comprises the following steps: mixing 1.25% polyacrylate emulsion and 8.75% epoxy resin emulsion, heating to 85 deg.C, and stirring at 600-800 r/min for 40min.
(5) And finally, adding 1% of thickening agent to adjust the viscosity, thereby obtaining the water-based intumescent fire-retardant coating.
Example 3
The embodiment provides a water-based intumescent fire retardant coating for an outdoor steel structure, which is prepared according to the following method:
(1) 4% PVA was added to 85 ℃ distilled water, and the mixture was stirred at 800r/min for 10min to dissolve it sufficiently.
(2) Adding 6% of aluminum hydroxide, 2% of titanium dioxide, 2% of kaolin, 2% of wollastonite powder, 2% of quartz powder, 5% of steel slag micro powder, 0.25% of dispersing agent and 0.25% of defoaming agent, and stirring at the rotating speed of 1200r/min for 20min.
(3) Then 11 percent of ammonium polyphosphate, 7 percent of melamine, 14 percent of pentaerythritol and 19 percent of expandable graphite are added, and the mixture is continuously stirred for 20min.
(4) After being stirred evenly, 10 percent of mixture of polyacrylate emulsion and epoxy emulsion is added, and 15mim is stirred at the rotating speed of 800 r/min. The preparation method of the mixture of the polyacrylate emulsion and the epoxy emulsion comprises the following steps: mixing 1.25% polyacrylate emulsion and 8.75% epoxy resin emulsion, heating to 85 deg.C, and stirring at 600r/min for 40min.
(5) And finally, adding 0.5% of thickening agent to adjust the viscosity, thereby obtaining the water-based intumescent fire-retardant coating.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims (10)

1. The water-based intumescent fire-retardant coating for the outdoor steel structure is characterized by comprising the following components in percentage by weight: 15-20% of deionized water, 8-11.2% of ammonium polyphosphate, 5-7% of melamine, 10-14% of pentaerythritol, 10-13% of a mixture of polyacrylate emulsion and epoxy resin emulsion, 2-4% of titanium dioxide, 2-4% of kaolin, 4-6% of water-soluble polyvinyl alcohol fiber, 15-19% of expandable graphite, 2-4% of wollastonite powder, 2-4% of quartz powder, 5-7% of steel slag micropowder, 6-8% of aluminum hydroxide and 1-2% of other additives.
2. The water-based intumescent fire retardant coating for outdoor steel structures as claimed in claim 1, characterized in that the water-soluble polyvinyl alcohol fiber has a dissolution temperature of 70-90 ℃ in water, a fiber insoluble content of not more than 0.5% at a water temperature of 95 ℃, a linear density deviation rate of +/-8%, a length deviation rate of +/-6%, a dry breaking strength of not less than 3.8CN, a dry breaking elongation of 23 +/-5%, a foreign fiber of not more than 20.0mg/100g, a crimp number of not less than 3.5/25 mm, and an oiling rate of not less than 0.1%.
3. The water-based intumescent fire retardant coating for outdoor steel structure as claimed in claim 1, characterized in that the specific surface area of said steel slag micropowder is not less than 550m 2 Kg, density is more than or equal to 3.2g/cm 3 The water content is less than or equal to 1.0 percent, the free calcium oxide content is less than or equal to 4.0 percent, the sulfur trioxide content is less than or equal to 4.0 percent, and the chloride ion content is less than or equal to 0.06 percent.
4. The aqueous intumescent fire retardant coating for outdoor steel structures as claimed in claim 1, characterized in that said other auxiliary agents comprise thickening agent, dispersing agent and defoaming agent, wherein said thickening agent is bentonite, said dispersing agent is polyacrylic acid sodium salt 731A, and said defoaming agent is polypropylene glycol PPG-400.
5. A preparation method of a water-based intumescent fire retardant coating for an outdoor steel structure is characterized by comprising the following steps:
s1, weighing the components according to the mass percentage of the water-based intumescent fire retardant coating for the outdoor steel structure as claimed in any one of claims 1 to 4, adding the water-soluble polyvinyl alcohol fiber into the distilled water, and uniformly stirring to obtain a polyvinyl alcohol aqueous solution;
s2, adding the aluminum hydroxide, the titanium dioxide, the kaolin, the wollastonite powder, the quartz powder, the steel slag micro powder, the dispersing agent and the defoaming agent into the polyvinyl alcohol aqueous solution, and stirring to obtain a first mixed solution;
s3, adding the ammonium polyphosphate, the melamine, the pentaerythritol and the expandable graphite into the first mixed solution, and stirring to obtain a second mixed solution;
and S4, adding the mixture of the polyacrylate emulsion and the epoxy emulsion into the second mixed solution, stirring, and adding a thickening agent to obtain the water-based intumescent fire retardant coating.
6. The preparation method according to claim 5, wherein in the step S1, the temperature of the distilled water is 70-90 ℃, the stirring speed is 800-1000 r/min, and the stirring time is 5-15 min.
7. The method according to claim 5, wherein in step S2, the stirring speed is 1000 to 1200r/min and the stirring time is 15 to 25min.
8. The method according to claim 5, wherein in the step S3, the stirring speed is 1000 to 1200r/min and the stirring time is 15 to 20min.
9. The method according to claim 5, wherein the step of preparing the mixture of polyacrylate emulsion and epoxy emulsion in step S4 comprises: mixing polyacrylate emulsion and epoxy emulsion at 65-85 ℃ in a proportion of 1: 6.8-7.2 to obtain the mixture of the polyacrylate emulsion and the epoxy emulsion.
10. The preparation method according to claim 5, wherein in step S4, the stirring speed is 600-800 r/min and the stirring time is 10-15 min.
CN202211181393.1A 2022-09-27 2022-09-27 Water-based intumescent fire retardant coating for outdoor steel structure and preparation method thereof Pending CN115537099A (en)

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Citations (2)

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Publication number Priority date Publication date Assignee Title
CN102838907A (en) * 2012-08-24 2012-12-26 华南理工大学 Waterborne ultra-thin steel structure fire retardant coating and preparation method thereof
CN106833174A (en) * 2017-01-11 2017-06-13 合肥英索莱特新材料科技有限公司 Expansion type tunnel fire-proof paint

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
CN102838907A (en) * 2012-08-24 2012-12-26 华南理工大学 Waterborne ultra-thin steel structure fire retardant coating and preparation method thereof
CN106833174A (en) * 2017-01-11 2017-06-13 合肥英索莱特新材料科技有限公司 Expansion type tunnel fire-proof paint

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