CN110862748B - Fireproof heat-insulating coating and preparation method and application thereof - Google Patents
Fireproof heat-insulating coating and preparation method and application thereof Download PDFInfo
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- 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
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/62—Alcohols or phenols
- C08G59/621—Phenols
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/004—Reflecting paints; Signal paints
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- 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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- 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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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
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- C08K3/20—Oxides; Hydroxides
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- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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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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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- C—CHEMISTRY; METALLURGY
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- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The invention relates to a fireproof heat-insulating coating and a preparation method and application thereof, belonging to the technical field of coatings. The fireproof heat-insulating coating is prepared from the following raw materials in parts by weight: 40-45 parts of water-based epoxy resin, 3-6 parts of Schiff base curing agent, 3-6 parts of phenolic aldehyde amine curing agent, 3-6 parts of phosphorus flame retardant, 5-8 parts of inorganic flame retardant, 5-8 parts of hollow microsphere, 5-8 parts of heat-reflecting heat-insulating powder, 4-8 parts of titanium dioxide, 2.3-6.6 parts of auxiliary agent and 15-20 parts of solvent. In the fireproof heat-insulating coating, the Schiff base curing agent, the phosphorus flame retardant and the inorganic flame retardant are compounded, so that the fireproof heat-insulating coating has good physical and chemical properties and weather resistance, the fire resistance limit is more than 1 hour, the solar light reflection ratio is large, the heat insulation temperature difference is large, the heat conductivity coefficient is small, the heat insulation and heat preservation properties are good, and meanwhile, the preparation process is simple, the construction is convenient, the environment is protected, and the fireproof heat-insulating coating is suitable for fabricated steel structure buildings.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a fireproof heat-insulating coating and a preparation method and application thereof.
Background
Steel structures are good conductors of heat, and their bearing capacity and structural strength decrease in a fire, which may result in collapse of a building and cause serious casualties and property damage. The special steel structure fireproof paint is coated on a steel structure, and is one of the most convenient and effective measures for steel structure fire prevention. The inorganic fireproof coating has the advantages of long fireproof time, low price, environmental protection, good weather resistance and the like, but the coating is thick and does not expand, the construction is inconvenient, and the decoration is poor. The organic fireproof coating has the advantages of thin coating, convenient construction and decoration, but can release toxic smoke when meeting fire, and has poor water resistance and weather resistance. The organic-inorganic composite fireproof coating can take advantages of both organic fireproof coating and inorganic fireproof coating. In addition, the steel structure outer enclosure wall and the roof have fast heat transfer and heat dissipation, which is not beneficial to building energy conservation. The building coating is used in the building exterior envelope structure, and the fireproof and energy-saving effects can be achieved at the same time.
However, the architectural coatings in the current market still cannot give consideration to the fireproof, heat insulation and physical and chemical properties of the coating, and still have the problems of poor weather resistance, heavy coating, inconvenient construction and the like, thereby bringing obstacles to the development and application of steel structures.
Disclosure of Invention
In view of the above, it is necessary to provide a fireproof and heat-insulating coating material, which can ensure the fire resistance limit and heat insulation capability of the coating material and simultaneously achieve the water resistance and weather resistance of the coating material when being used for coating a steel structure.
The fireproof heat-insulating coating is prepared from the following raw materials in parts by weight:
40-45 parts of water-based epoxy resin, 3-6 parts of Schiff base curing agent, 3-6 parts of phenolic aldehyde amine curing agent, 3-6 parts of phosphorus flame retardant, 5-8 parts of inorganic flame retardant, 5-8 parts of hollow microsphere, 5-8 parts of heat-reflecting heat-insulating powder, 4-8 parts of titanium dioxide, 2.3-6.6 parts of auxiliary agent and 15-20 parts of solvent.
In the fireproof heat-insulating coating, the Schiff base curing agent has a curing reaction with the waterborne epoxy resin to endow the coating with good mechanical strength and thermal stability, and explains the release of incombustible gas in the combustion process to inhibit combustion and promote the expansion of the coating; the phosphorus element in the phosphorus flame retardant and the nitrogen and carbon elements in the Schiff base curing agent have a synergistic flame retardant effect; the inorganic flame retardant forms a barrier layer on the surface of the coating and inhibits combustion together with the organic flame retardant, and has positive promoting effect on the mechanical strength, weather resistance and heat insulation effect of the coating. The compounding of the Schiff base curing agent, the phosphorus flame retardant and the inorganic flame retardant endows the coating with excellent physical and chemical properties, weather resistance and fireproof and heat-insulating properties.
In one embodiment, the fireproof heat-insulation coating is prepared from the following raw materials in parts by weight:
40-45 parts of water-based epoxy resin, 3-4 parts of Schiff base curing agent, 4-5 parts of phenolic aldehyde amine curing agent, 3-5 parts of phosphorus flame retardant, 5-7 parts of inorganic flame retardant, 5-7 parts of hollow microsphere, 5-7.6 parts of heat-reflecting heat-insulating powder, 4.2-7 parts of titanium dioxide, 2.3-6.6 parts of auxiliary agent and 16-18 parts of solvent.
In one embodiment, the aqueous epoxy resin is selected from: at least one of bisphenol A epoxy resin EP44, bisphenol A epoxy resin EP51 and novolac epoxy resin FP 44.
In one embodiment, the auxiliary comprises: 1-3 parts of film forming auxiliary agent, 1-3 parts of dispersing and leveling agent, 0.2-0.4 part of hydrophobic agent and 0.1-0.2 part of defoaming agent.
In one embodiment, the schiff base curing agent is prepared by the following method: 2, 5-dihydroxy benzaldehyde and 4,4' -diaminodiphenyl ether are mixed according to the weight ratio of 2-3: 1, and synthesizing epoxy curing agent 4,4' -bis (2, 4-dihydroxyphenylimino) diphenyl ether containing Schiff base structure.
The structural formula of the 4,4' -bis (2, 4-dihydroxybenzimido) diphenyl ether is as follows:
in one embodiment, the phosphorus-based flame retardant is at least one of ammonium polyphosphate, phosphate, phosphonate, 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and derivatives thereof.
In one embodiment, the inorganic flame retardant is at least two of nano magnesium hydroxide (with the particle size less than or equal to 1 mu m), nano aluminum hydroxide (with the particle size less than or equal to 500nm), nano silicon dioxide (with the particle size less than or equal to 100nm) and zinc borate (with the particle size less than or equal to 1 mu m).
In one embodiment, the solvent is: 20 to 30 percent of ethanol aqueous solution.
In one embodiment, the hollow microspheres are at least one of hollow glass microspheres or hollow ceramic microspheres;
the heat-reflecting heat-insulating powder is at least one of 325-mesh, 800-mesh or 2000-mesh infrared ceramic powder;
the titanium dioxide is at least one of rutile type titanium dioxide or anatase type titanium dioxide.
The invention also discloses a preparation method of the fireproof heat-insulating coating, which comprises the following steps:
adding a predetermined amount of auxiliary agent into a solvent, uniformly stirring, then adding the water-based epoxy resin, the phosphorus flame retardant, the inorganic flame retardant, the hollow microspheres, the heat-reflecting heat-insulating powder and the titanium dioxide, dispersing until the fineness of the mixture is lower than 40 mu m, then adding the Schiff base curing agent, the phenolic aldehyde amine curing agent and the rest of auxiliary agent under stirring, stirring and filtering to obtain the composite material.
In one embodiment, the preparation method of the fireproof heat insulation coating comprises the following steps:
(1) adding a dispersing and leveling agent and a half of defoaming agent into a solvent, and stirring at a low speed (600-800 r/min) for 3-5 min;
(2) adding water-based epoxy resin, a phosphorus flame retardant, an inorganic flame retardant, hollow microspheres, heat-reflecting heat-insulating powder and titanium dioxide, and dispersing at medium speed (800-1000 r/min) for 20-30 min until the fineness of the mixture is lower than 40 mu m;
(3) and adding a Schiff base curing agent, a phenolic aldehyde amine curing agent, a film forming auxiliary agent, a hydrophobic agent and the other half of defoaming agent under low-speed (600-800 r/min) stirring, stirring for 20-30 min, and filtering to obtain the fireproof heat-insulating coating.
In one embodiment, the schiff base curing agent is prepared by the following method: adding a mixture of 1: 2-3 of 4,4 '-diaminodiphenyl ether, 2, 5-dihydroxybenzaldehyde and absolute ethyl alcohol with the mole number being 45-55 times of that of 4,4' -diaminodiphenyl ether, uniformly stirring, reacting for 4-8 hours at the temperature of 60-90 ℃, cooling, filtering, washing a filter cake and drying to obtain the Schiff base curing agent.
The invention also discloses application of the fireproof heat-insulating coating in coating a steel structure.
The fireproof heat-insulating coating is coated on the surface of a steel structure, so that the bearing capacity and the structural strength of the steel structure under a high-heat condition can be improved, and the steel structure is effectively prevented from fire.
Compared with the prior art, the invention has the following beneficial effects:
according to the fireproof heat-insulating coating, the Schiff base curing agent, the phosphorus flame retardant and the inorganic flame retardant are compounded, so that the fireproof heat-insulating coating is good in physical and chemical properties and weather resistance, the fire resistance limit is more than 1 hour, the solar light reflection ratio is large, the heat insulation temperature difference is large, the heat conductivity coefficient is small, the heat insulation performance is good, meanwhile, the preparation process is simple, the construction is convenient, the environment is protected, and the fireproof heat-insulating coating is suitable for fabricated steel structure buildings.
Detailed Description
In order that the invention may be more fully understood, preferred embodiments of the invention are now described. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The following examples all used starting materials, unless otherwise specified, were conventional.
Example 1
The fireproof heat-insulating coating comprises the following raw materials in parts by weight:
45 parts of water-based epoxy resin: bisphenol a epoxy resin EP 44;
4 parts of Schiff base curing agent: 4,4' -bis (2, 4-dihydroxybenzimido) diphenyl ether;
5 parts of phenolic aldehyde amine curing agent: t31;
5 parts of phosphorus flame retardant: ammonium polyphosphate;
7 parts of inorganic flame retardant: 4 parts of nano magnesium hydroxide (with the particle size of about 500nm) and 3 parts of nano aluminum hydroxide (with the particle size of about 200 nm);
5 parts of hollow microspheres: hollow glass microspheres (particle size about 180 μm);
5 parts of heat-reflecting heat-insulating powder: 800 mesh infrared ceramic powder;
4.2 parts of titanium dioxide: rutile type titanium dioxide (particle size about 200 nm);
1.8 parts of a film-forming assistant;
1.6 parts of a dispersing leveling agent;
0.2 part of a water repellent agent;
0.2 part of defoaming agent;
16 parts of ethanol aqueous solution: the ethanol content is 25%.
The synthesis process of the Schiff base curing agent comprises the following steps:
(1) adding 4,4 '-diaminodiphenyl ether and 2, 5-dihydroxybenzaldehyde in a molar ratio of 1:2.8 and 54 times of anhydrous ethanol in terms of molar number of 4,4' -diaminodiphenyl ether into a reactor, and uniformly stirring;
(2) reacting for 5 hours at 85 ℃, cooling, filtering, washing a filter cake and drying to obtain the 4,4' -bis (2, 4-dihydroxyphenyl imino) diphenyl ether.
The fireproof heat-insulating coating of the embodiment is prepared by the following preparation method:
(1) adding a dispersing and leveling agent and a half of defoaming agent into the ethanol water solution, and stirring at a low speed (600r/min) for 5 min;
(2) adding water-based epoxy resin, a phosphorus flame retardant, an inorganic flame retardant, hollow microspheres, heat-reflecting heat-insulating powder and titanium dioxide, and dispersing at medium speed (800r/min) for 30min until the fineness of the mixture is lower than 40 mu m;
(3) and adding a Schiff base curing agent, a phenolic aldehyde amine curing agent T31, a film-forming aid, a hydrophobing agent and the other half of a defoaming agent under low-speed (650r/min) stirring, stirring for 28min, and filtering to obtain the fireproof heat-insulating coating.
Example 2
The fireproof heat-insulating coating comprises the following raw materials in parts by weight:
42 parts of water-based epoxy resin: bisphenol a epoxy resin EP 51;
4 parts of Schiff base curing agent: 4,4' -bis (2, 4-dihydroxybenzimido) diphenyl ether;
4 parts of phenolic aldehyde amine curing agent: t31;
4 parts of phosphorus flame retardant: 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO);
6 parts of inorganic flame retardant: 3 parts of nano aluminum hydroxide (with the particle size of about 200nm) and 3 parts of nano silicon dioxide (with the particle size of about 50 nm);
6 parts of hollow microspheres: hollow glass microspheres (particle size about 150 μm);
6 parts of heat-reflecting heat-insulating powder: 300 mesh infrared ceramic powder;
6 parts of titanium dioxide: anatase titanium dioxide (particle size about 500 nm);
2 parts of a film-forming additive;
1.5 parts of a dispersing leveling agent;
0.3 part of a water repellent agent;
0.2 part of defoaming agent;
18 parts of ethanol aqueous solution: the ethanol content was 21%.
The synthesis process of the Schiff base curing agent comprises the following steps:
(1) adding 4,4 '-diaminodiphenyl ether and 2, 5-dihydroxybenzaldehyde in a molar ratio of 1:2.5 and absolute ethanol with the molar number 50 times that of 4,4' -diaminodiphenyl ether into a reactor, and uniformly stirring;
(2) reacting for 6.5 hours at 78 ℃, cooling, filtering, washing a filter cake and drying to obtain the 4,4' -bis (2, 4-dihydroxyphenylimino) diphenyl ether.
The fireproof heat-insulating coating of the embodiment is prepared by the following preparation method:
(1) adding a dispersing and leveling agent and a half of defoaming agent into the ethanol water solution, and stirring at a low speed (700r/min) for 4 min;
(2) adding water-based epoxy resin, a phosphorus flame retardant, an inorganic flame retardant, hollow microspheres, heat-reflecting heat-insulating powder and titanium dioxide, and dispersing at a medium speed (900r/min) for 25min until the fineness of the mixture is lower than 40 mu m;
(3) and adding the Schiff base curing agent, the phenolic aldehyde amine curing agent, the film-forming assistant, the hydrophobing agent and the other half of the defoaming agent under low-speed (700r/min) stirring, stirring for 25min, and filtering to obtain the fireproof heat-insulating coating.
Example 3
The fireproof heat-insulating coating comprises the following raw materials in parts by weight:
40 parts of water-based epoxy resin: novolac epoxy FP 44;
4 parts of Schiff base curing agent: 4,4' -bis (2, 4-dihydroxybenzimido) diphenyl ether;
4 parts of phenolic aldehyde amine curing agent: t31;
3 parts of phosphorus flame retardant: a phosphonate ester;
5 parts of inorganic flame retardant: 1 part of nano magnesium hydroxide (with the grain diameter of about 500nm), 2 parts of nano aluminum hydroxide (with the grain diameter of about 200nm) and 2 parts of zinc borate (with the grain diameter of about 500 nm);
7 parts of hollow microspheres: hollow glass microspheres (particle size about 150 μm);
7.6 parts of heat-reflecting heat-insulating powder: 2000 mesh infrared ceramic powder;
7 parts of titanium dioxide: rutile type titanium dioxide (particle size about 300 nm);
2.1 parts of a film-forming assistant;
1.8 parts of a dispersing leveling agent;
0.35 part of a water repellent agent;
0.15 part of defoaming agent;
18 parts of ethanol aqueous solution: the ethanol content is 29%.
The synthesis process of the Schiff base curing agent comprises the following steps:
(1) adding 4,4 '-diaminodiphenyl ether and 2, 5-dihydroxybenzaldehyde in a molar ratio of 1:2.2 and 47 times of absolute ethyl alcohol in terms of molar number of 4,4' -diaminodiphenyl ether into a reactor, and uniformly stirring;
(2) reacting for 7.5 hours at 65 ℃, cooling, filtering, washing a filter cake and drying to obtain the 4,4' -bis (2, 4-dihydroxyphenylimino) diphenyl ether.
The fireproof heat-insulating coating of the embodiment is prepared by the following preparation method:
(1) adding a dispersing and leveling agent and a half of defoaming agent into the ethanol water solution, and stirring at a low speed (800r/min) for 3 min;
(2) adding water-based epoxy resin, a phosphorus flame retardant, an inorganic flame retardant, hollow microspheres, heat-reflecting heat-insulating powder and titanium dioxide, and dispersing at a medium speed (950r/min) for 20min until the fineness of the mixture is lower than 40 mu m;
(3) and adding the Schiff base curing agent, the phenolic aldehyde amine curing agent, the film-forming assistant, the hydrophobing agent and the other half of the defoaming agent under low-speed (780r/min) stirring, stirring for 22min, and filtering to obtain the fireproof heat-insulating coating.
Comparative example 1
A fire-proof heat-insulating coating is a conventional inorganic fire-proof coating, and the formula of the fire-proof heat-insulating coating is as follows:
45 parts of water-based epoxy resin: bisphenol a epoxy resin EP 44;
9 parts of phenolic aldehyde amine curing agent: t31;
12 parts of inorganic flame retardant: 3 parts of nano magnesium hydroxide (with the particle size of about 500nm), 3 parts of nano aluminum hydroxide (with the particle size of about 200nm), 3 parts of nano silicon dioxide (with the particle size of about 50nm) and 3 parts of zinc borate (with the particle size of about 500 nm);
5 parts of hollow microspheres: hollow glass microspheres (particle size about 180 μm);
5 parts of heat-reflecting heat-insulating powder: 800 mesh infrared ceramic powder;
4.2 parts of titanium dioxide: rutile type titanium dioxide (particle size about 200 nm);
1.8 parts of a film-forming assistant;
1.6 parts of a dispersing leveling agent;
0.2 part of a water repellent agent;
0.2 part of defoaming agent;
16 parts of ethanol aqueous solution: the ethanol content is 25%.
The fireproof heat-insulating coating of the embodiment is prepared by the following preparation method:
(1) adding a dispersing and leveling agent and a half of defoaming agent into the ethanol water solution, and stirring at a low speed (600r/min) for 5 min;
(2) adding water-based epoxy resin, inorganic flame retardant, hollow microspheres, heat-reflecting heat-insulating powder and titanium dioxide, and dispersing at medium speed (800r/min) for 30min until the fineness of the mixture is lower than 40 μm;
(3) adding phenolic aldehyde amine curing agent T31, film-forming assistant, hydrophobing agent and the other half of defoaming agent under low-speed (650r/min) stirring, stirring for 28min, and filtering to obtain the fireproof heat-insulating coating.
Comparative example 2
A fire-proof heat-insulating coating is a conventional organic fire-proof coating, and the formula of the fire-proof heat-insulating coating is as follows:
45 parts of water-based epoxy resin: bisphenol a epoxy resin EP 44;
9 parts of phenolic aldehyde amine curing agent: t31;
12 parts of organic flame retardant: 4 parts of ammonium polyphosphate, 4 parts of pentaerythritol and 4 parts of melamine;
5 parts of hollow microspheres: hollow glass microspheres (particle size about 180 μm);
5 parts of heat-reflecting heat-insulating powder: 800 mesh infrared ceramic powder;
4.2 parts of titanium dioxide: rutile type titanium dioxide (particle size about 200 nm);
1.8 parts of a film-forming assistant;
1.6 parts of a dispersing leveling agent;
0.2 part of a water repellent agent;
0.2 part of defoaming agent;
16 parts of ethanol aqueous solution: the ethanol content is 25%.
The fireproof heat-insulating coating of the embodiment is prepared by the following preparation method:
(1) adding a dispersing and leveling agent and a half of defoaming agent into the ethanol water solution, and stirring at a low speed (600r/min) for 5 min;
(2) adding water-based epoxy resin, organic flame retardant, hollow microspheres, heat-reflecting heat-insulating powder and titanium dioxide, and dispersing at medium speed (800r/min) for 30min until the fineness of the mixture is lower than 40 μm;
(3) adding phenolic aldehyde amine curing agent T31, film-forming assistant, hydrophobing agent and the other half of defoaming agent under low-speed (650r/min) stirring, stirring for 28min, and filtering to obtain the fireproof heat-insulating coating.
Comparative example 3
A fire-retardant and heat-insulating coating, similar to the coating formulation of example 1, except that: the epoxy curing agent used was 9 parts of phenolic aldehyde amine curing agent T31, with no schiff base curing agent added.
Examples of the experiments
The fireproof heat-insulating coating in the embodiment 1-3 is obtained by adopting the preparation method, the physical and chemical properties, the weather resistance and the fireproof performance are tested according to GB/T14907-2018, the sunlight reflection ratio and the heat insulation temperature difference are tested according to JGT235-2008, the heat conductivity coefficient is tested according to GB10295-1988, and the test results are shown in the following table.
TABLE 1 Performance index of the fireproof thermal insulation coating
TABLE 2 Performance test results of the fire-resistant and heat-insulating coating materials in examples and comparative examples
From the test results, the fireproof heat-insulating coating added with the Schiff base curing agent is sprayed on steel, has high bonding strength, good weather resistance, long fire resistance limit and good heat-insulating effect, and can be used as a heat-insulating material on an assembled steel structure outer enclosure system.
The coating in comparative example 1 is a conventional inorganic flame retardant modified fireproof heat-insulating coating, and has the advantages of small amount of agglomeration in a container, long coating drying time, low bonding strength, little cracking after an exposure heat resistance test, and low fire resistance limit. The coating in the comparative example 2 is a fireproof heat-insulating coating modified by a conventional organic flame retardant, and a little layer appears after the test of humidity resistance, heat resistance and salt spray corrosion resistance, so that the fireproof limit is low, and the heat-insulating effect is poor. The coating in the comparative example 3 is a fireproof heat-insulating coating prepared by completely replacing a Schiff base curing agent with a conventional phenolic aldehyde amine curing agent, has a low fire resistance limit, and cannot meet the fireproof requirement.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. The fireproof heat-insulating coating is characterized by being prepared from the following raw materials in parts by weight:
40-45 parts of water-based epoxy resin, 3-6 parts of Schiff base curing agent, 3-6 parts of phenolic aldehyde amine curing agent, 3-6 parts of phosphorus flame retardant, 5-8 parts of inorganic flame retardant, 5-8 parts of hollow microsphere, 5-8 parts of heat-reflecting heat-insulating powder, 4-8 parts of titanium dioxide, 2.3-6.6 parts of auxiliary agent and 15-20 parts of solvent;
the phosphorus flame retardant is at least one of ammonium polyphosphate, phosphonate ester and 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide;
the inorganic flame retardant is at least two of nano magnesium hydroxide, nano aluminum hydroxide, nano silicon dioxide and zinc borate;
the Schiff base curing agent is prepared by the following method: 2, 5-dihydroxy benzaldehyde and 4,4' -diaminodiphenyl ether are mixed according to the weight ratio of 2-3: 1, synthesizing epoxy curing agent 4,4' -bis (2, 4-dihydroxyphenylimino) diphenyl ether containing Schiff base structure to obtain the product;
the heat reflection heat insulation powder is at least one of 325-mesh, 800-mesh or 2000-mesh infrared ceramic powder.
2. The fireproof thermal insulation coating according to claim 1, wherein the auxiliary agent comprises: 1-3 parts of film forming auxiliary agent, 1-3 parts of dispersing and leveling agent, 0.2-0.4 part of hydrophobic agent and 0.1-0.2 part of defoaming agent.
3. The fireproof and heat-insulating coating according to claim 1 or 2, wherein the solvent is: and the ethanol aqueous solution with the volume percentage concentration of 20% -30%.
4. The fireproof heat-insulating coating according to claim 1 or 2, wherein the cenospheres are at least one of cenospheres of hollow glass or cenospheres of hollow ceramic;
the titanium dioxide is at least one of rutile type titanium dioxide or anatase type titanium dioxide.
5. The method for preparing the fireproof heat-insulating coating of any one of claims 1 to 4, which is characterized by comprising the following steps:
adding a predetermined amount of auxiliary agent into a solvent, uniformly stirring, then adding the water-based epoxy resin, the phosphorus flame retardant, the inorganic flame retardant, the hollow microspheres, the heat-reflecting heat-insulating powder and the titanium dioxide, dispersing until the fineness of the mixture is lower than 40 mu m, then adding the Schiff base curing agent, the phenolic aldehyde amine curing agent and the rest of auxiliary agent under stirring, stirring and filtering to obtain the composite material.
6. The preparation method according to claim 5, wherein the Schiff base curing agent is prepared by the following method: adding a mixture of 1: 2-3 of 4,4 '-diaminodiphenyl ether, 2, 5-dihydroxybenzaldehyde and absolute ethyl alcohol with the mole number being 45-55 times of that of 4,4' -diaminodiphenyl ether, uniformly stirring, reacting for 4-8 hours at the temperature of 60-90 ℃, cooling, filtering, washing a filter cake and drying to obtain the Schiff base curing agent.
7. Use of the fire protection and thermal insulation coating of any one of claims 1 to 4 for coating steel structures.
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