CN115403946A - Gypsum-based comprehensive modified steel structure fireproof coating and preparation method and application method thereof - Google Patents

Gypsum-based comprehensive modified steel structure fireproof coating and preparation method and application method thereof Download PDF

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CN115403946A
CN115403946A CN202211108353.4A CN202211108353A CN115403946A CN 115403946 A CN115403946 A CN 115403946A CN 202211108353 A CN202211108353 A CN 202211108353A CN 115403946 A CN115403946 A CN 115403946A
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gypsum
steel structure
fireproof coating
modified steel
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王爱红
谭仝奎
费飞
康崇为
李慧
毋凡琛
李超杰
李梦璐
李月波
杨泽茹
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BAOTOU RESEARCH INSTITUTE OF METALLURGICAL CONSTRUCTION
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    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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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
    • C09D5/08—Anti-corrosive paints
    • 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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    • 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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    • C09D7/00—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
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    • 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
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    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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Abstract

The invention discloses a gypsum-based comprehensive modified steel structure fireproof coating as well as a preparation method and an application method thereof, belonging to the field of fireproof materials, and the fireproof coating comprises the following components in parts by mass: 35-65 parts of regenerated alpha-high-strength gypsum, 5-15 parts of sepiolite, 5-10 parts of brucite fiber, 1-3 parts of waste polyphenyl regenerated particles, 5-10 parts of floating beads, 10-20 parts of perlite, 3-10 parts of admixture (FL), 3-10 parts of rare earth oxide, 1-3 parts of composite additive and 80-120 parts of tap water; according to the invention, through comprehensive modification of gypsum, the water resistance of the steel structure fireproof coating is obviously improved, the elastic plasticity of the material is increased, and the fire resistance limit of the coating is improved, so that the coating shows good binding power, cracking resistance and fire resistance after being sprayed; the invention adopts industrial solid waste as a main raw material, changes waste into valuable, enlarges the range of consuming industrial waste residue and is beneficial to environmental protection.

Description

Gypsum-based comprehensive modified steel structure fireproof coating and preparation method and application method thereof
Technical Field
The invention relates to the field of fireproof materials, in particular to gypsum-based comprehensive modified steel structure fireproof coating and a preparation method and an application method thereof.
Background
The steel structure is a green energy-saving environment-friendly building material, and is widely applied to the building industry because of the advantages of light dead weight, high strength, good earthquake resistance, easy installation and the like. Compared with a concrete structure, the fire resistance of a steel structure is poor, and the reason is mainly two aspects: firstly, the heat conduction coefficient of steel is large, and the temperature of a steel component is quickly raised in case of fire; secondly, the strength of the steel material decreases rapidly with increasing temperature.
The fire-resistant time of the steel structure without fire protection is usually only 15min-20min, so the steel structure is easy to damage under the action of fire; therefore, in order to prevent and reduce the fire hazard of the building steel structure, the steel structure must be scientifically designed to be fireproof, and safe, reliable, economical and reasonable fireproof protection measures are taken.
At present, steel structure fire-proof coatings are divided into two main categories, namely organic expansion type and inorganic heat insulation type. In the initial development stage of the fireproof coating, the organic intumescent fireproof coating is sought after by people because of good decoration and the thickness of the organic intumescent fireproof coating is only 2-7 mm; however, most organic substances are easily agedIn addition, the fire retardant contained in the organic fire-retardant coating is mostly C-N-P or C-N-P-CL system, which contains melamine, chlorinated paraffin and other substances, which can be quickly decomposed to generate NO harmful to human body after being subjected to high temperature 2 CO and HCl, all of which have a choking effect. This results in the first toxic gas from the fire-retardant coating to expand when heated during a fire, thereby increasing the number of casualties from a building fire.
At present, the traditional domestic inorganic heat-insulating fireproof coating is mainly cement-based steel structure fireproof coating, gypsum-based steel structure fireproof coating and traditional non-intumescent fireproof coating, most of the traditional inorganic heat-insulating fireproof coating is prepared from materials such as cement, perlite, vermiculite and the like, and the fireproof coating needs to be hung in construction due to the heavy weight of a cement base material, is long in maintenance period after construction, is complicated in construction and high in construction cost, is easy to crack after the cement is hydrated, is poor in adhesion relative to a steel structure, and is easy to fall off.
Disclosure of Invention
The invention aims to provide a gypsum-based comprehensive modified steel structure fireproof coating, and a preparation method and an application method thereof.
The technical scheme adopted by the invention is as follows:
according to a first aspect of the disclosure, the invention provides a gypsum-based comprehensive modified steel structure fireproof coating, which comprises the following powder materials: 35-65 parts of alpha-high-strength gypsum, 5-15 parts of sepiolite, 5-10 parts of brucite fiber, 1-3 parts of polyphenyl granules, 5-10 parts of floating beads, 10-20 parts of perlite, 3-10 parts of admixture, 3-10 parts of rare earth oxide and 1-3 parts of composite additive by mass; wherein the admixture is a mixture of blast furnace slag powder and aluminate cement; the composite additive is any one or a mixture of a plurality of water reducing agent, defoaming agent, retarder and air entraining agent; the powder material and the water are mixed according to the mass ratio of 1.
In an exemplary embodiment of the present disclosure, the α -high strength gypsum is regenerated α -high strength gypsum prepared by high temperature calcination and aging of desulfurized gypsum, and the main component is CaSO 4 ·1/2H 2 O。
In an exemplary embodiment of the present disclosure, the polyphenyl granules are crushed granules obtained by crushing waste foam boxes and foam boards, and the particle size of the crushed granules is 1-3mm, and further preferably 1-2mm or 2-3mm.
In an exemplary embodiment of the present disclosure, the floating bead particle size ranges from: 0.25 to 0.83mm, more preferably 0.38 to 0.83mm, and still more preferably 0.55mm.
In an exemplary embodiment of the present disclosure, the perlite particle size ranges are: 1 to 3mm, more preferably 1 to 2.36mm.
In an exemplary embodiment of the present disclosure, the blast furnace slag powder is blast furnace slag produced by water quenching solid waste blast furnace slag, and is ground to 400 meshes or more and powder with an activity index of 75% or more, and the main components of the powder include: 37.58% CaO,33.65% SiO 2 13.70% of Al 2 O 3 0.88% of Fe 2 O 3 9.75% of MgO and 0.14% of SO 3 0.31% MnO,1.77% TiO 2 Lg of 2.22%.
Furthermore, the aluminate cement is CA-50 type aluminate cement, and has good heat resistance and corrosion resistance, and high strength and high hardness.
Further, the rare earth oxide is lanthanum oxide or cerium oxide.
Further, the water reducing agent is any one of a water-soluble resin water reducing agent and a polycarboxylic acid water reducing agent.
Further, the defoaming agent is any one of higher fatty acid, polyethylene glycol, polypropylene glycol, organic phosphate and modified organic silicon resin.
Further, the retarder is organic acid and soluble salt retarder or alkaline phosphate retarder thereof.
Further, the air entraining agent is alkyl and alkyl arene sulfonic acid or fatty alcohol sulfonate.
According to a second aspect of the disclosure, the invention provides a preparation method of a gypsum-based comprehensive modified steel structure fireproof coating, which comprises the following steps:
(1) Respectively weighing alpha-high-strength gypsum, sepiolite, brucite fiber, polyphenyl granules, floating beads, perlite, an admixture, a rare earth oxide and a composite additive according to the mass ratio; then, the materials were mixed in the following batches.
(2) Firstly, pouring alpha-high-strength gypsum, sepiolite, brucite fiber and admixture into a mixer to mix for 1-3min in advance.
(3) Then, the rare earth oxide and the composite admixture are poured into a mixer to be mixed for 2-10min.
(4) Then, pouring the polyphenyl granules, the floating beads and the perlite into a mixer to be uniformly mixed.
(5) And finally, adding water and mixing for 2-6min to obtain the gypsum-based comprehensive modified steel structure fireproof coating. The raw materials are respectively added according to the batches and mixed to realize uniform mixing.
According to a third aspect of the disclosure, the invention further provides an application method of the gypsum-based comprehensive modified steel structure fireproof coating, the fireproof coating is sprayed on the surface of a steel structure to form a fireproof layer, and preferably, the spraying thickness is 20-60mm.
The invention has the beneficial effects that: 1. the alpha-high-strength gypsum can be used for preparing the steel structure fireproof coating by adopting the regenerated alpha-high-strength gypsum prepared from industrial waste desulfurized gypsum as a main material, and the large application of the regenerated alpha-high-strength gypsum can relieve the problems of stockpiling and land occupation of the desulfurized gypsum and environmental pollution, thereby changing waste into valuable; in addition, the regenerated alpha-high-strength gypsum has the advantages of light weight, excellent heat-insulating property, good fireproof performance, low price, environmental protection, energy conservation and the like, so that the gypsum-based fireproof coating prepared by the invention has the characteristics of non-combustibility, heat insulation, fire insulation and no combustible volatile gas after meeting fire.
2. The modification admixture adopts a mixture of blast furnace slag powder and aluminate cement, wherein the blast furnace slag powder specifically adopts blast furnace slag generated by water quenching process of solid waste blast furnace slag generated in the steel-clad smelting process, and the powder is ground into powder with the granularity of more than 400 meshes and the activity index of more than 75%. The aluminate cement is CA-50 type aluminate cement, and has good heat resistance and corrosion resistance, and high strength and high hardness. Because the active alumina in the slag is hydrated in the alkaline medium of the aluminate cement to form calcium sulphoaluminate crystals, the hydration product of the regenerated alpha-high-strength gypsum composite cementing material has the characteristics of a calcium sulphate dihydrate and hydrated calcium silicate composite material, namely the hydration product has the common characteristics of gypsum and cement, the early strength is determined by the gypsum, the later strength is determined by the composite crystals excited by the gypsum and the slag, and the calcium sulphoaluminate and calcium silicate composite cementing material becomes a main factor for forming the setting strength and simultaneously forms the hydraulic cementing material. In addition, the blast furnace slag powder is embedded between the dihydrate gypsum crystals, can play a role of skeleton support, and is improved by 10-27% compared with the absolute dry compressive strength of single gypsum. Therefore, after the gypsum is comprehensively modified, the strength and the water resistance are greatly improved, the corrosion resistance and the impermeability of the gypsum are improved, the volume of the gypsum is slightly expanded in the hardening process, the fire resistance of the fireproof coating is improved, and the problems of hollowing and cracking of the fireproof coating caused by shrinkage after spraying can be solved.
3. The invention can adopt the waste polyphenyl regenerated particles as the light aggregate, greatly reduces the probability of the falling-off phenomenon of the fireproof material, and is beneficial to realizing the recycling of energy.
4. According to the invention, by matching the proportion and the granularity of the polyphenyl particles, the floating beads and the perlite and compounding the polyphenyl particles, the floating beads and the perlite with the comprehensive modified gypsum, a very compact protective layer can be formed, so that water, air and the like are effectively prevented from entering, the corrosion phenomenon of a steel structure is reduced, and the fire resistance of the fireproof coating is improved.
5. The invention introduces the rare earth oxide, utilizes the unique crystal phase structure and good heat reflection capability of the rare earth material, can effectively increase the heat reflection capability of the fireproof coating, obviously reduces the temperature rise speed of the internal steel structure, improves the fire resistance and high temperature resistance stability of the fireproof coating, better meets the fireproof, corrosion-resistant, heat-insulating and fireproof performances under various indoor and outdoor environments, and improves the application field of the fireproof coating of the steel structure.
6. The gypsum-based fireproof coating provided by the invention is simple in composition, simple and convenient in preparation process, easy to operate and strong in practicability; the fireproof coating prepared by the method has good performances of fire prevention, heat insulation and strong binding power, the elastic plasticity and the water resistance of the material are improved through modification, the problem that the steel structure fireproof coating in the prior art is easy to fall off is solved, in addition, the raw materials are prepared from a large amount of industrial solid wastes, the comprehensive cost is low, and the application prospect is wide.
Drawings
FIG. 1 is a diagram of a fire retardant coating configured in accordance with the present invention.
FIG. 2 is a schematic representation of the fireproof coating of the present invention sprayed on a steel structural member to form a fireproof layer.
Detailed Description
The technical solution of the present invention is described in detail by the following specific embodiments, but the content of the present invention is not limited to the following embodiments. The experimental procedures used in the following examples are conventional unless otherwise specified. Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Example 1
In the embodiment, a gypsum-based comprehensive modified steel structure fireproof coating is provided, and the fireproof coating comprises the following raw materials in parts by mass: 103 parts of powder and 90 parts of tap water, wherein the powder comprises the following components in parts by mass: 50 parts of regenerated alpha-high-strength gypsum, 5 parts of sepiolite, 10 parts of brucite fiber, 2 parts of waste polyphenyl regenerated particles, 8 parts of floating beads, 10 parts of perlite, 10 parts of modified admixture, 5 parts of rare earth oxide and 3 parts of composite additive.
Wherein, the sepiolite is purchased from Hebei Ponkan New Material science and technology Limited company, first-grade product; the brucite fiber is purchased from Majie building materials Co., ltd, first-grade product of Shijiazhuang; the floating beads are purchased from a Hui Chang floating bead factory from the chenge platform, and the fineness is 40 meshes; perlite is purchased from Gallery New popular Filter aid Limited, and has fineness of 1-3mm; the waste polyphenyl regenerated particles are crushed particles of the recycled waste foam box foam board, and the particle size is 1-2mm; the admixture is a mixture of blast furnace slag powder and aluminate cement, and the proportion of the blast furnace slag powder to the aluminate cement is 1:1; the rare earth oxide is cerium oxide and is purchased from Baotou Huamei rare earth high-tech limited; the composite additive is a polycarboxylic acid water reducing agent and an organic phosphate defoaming agent, and the mass ratio of the polycarboxylic acid water reducing agent to the organic phosphate defoaming agent is 2:1.
The preparation method of the gypsum-based comprehensive modified steel structure fireproof coating comprises the following steps: pouring weighed regenerated alpha-high-strength gypsum, sepiolite, brucite fiber and admixture into a mixer according to the weight ratio, stirring, adjusting the speed to 300 r/min, mixing for 2min, adding rare earth cerium oxide, a polycarboxylic acid water reducing agent and organic phosphate into the mixer, continuously stirring for 2min, and pouring waste polyphenyl regenerated particles, floating beads and perlite into the mixer until the waste polyphenyl regenerated particles, the floating beads and the perlite are uniformly mixed to obtain finished powder.
The application method of the gypsum-based comprehensive modified steel structure fireproof coating comprises the following steps: and (3) stirring the finished product powder and water according to the mass ratio of 1.9 to a state suitable for construction, and directly spraying the mixture on the surface of a steel structure, wherein the thickness of the coating is 30mm.
Example 2
In the embodiment, a gypsum-based comprehensive modified steel structure fireproof coating is provided, and the fireproof coating comprises the following raw materials in parts by mass: 100 parts of tap water, and the powder comprises the following components in parts by mass: 54 parts of regenerated alpha-high-strength gypsum, 5 parts of sepiolite, 10 parts of brucite fiber, 2 parts of hollow waste polyphenyl regenerated particles, 10 parts of floating beads, 10 parts of perlite, 6 parts of modified admixture, 3 parts of rare earth oxide and 2.5 parts of composite additive.
Wherein, the sepiolite is purchased from Hebei Ponkan New Material science and technology Limited company, first-grade product; the brucite fiber is purchased from Shijiazhuang Mayun building materials Co., ltd, first-grade product; the floating beads are purchased from a Hui Chang floating bead factory from the chenge platform, and the fineness is 30 meshes; perlite is purchased from new popular filter aid Limited of Gallery, and has fineness of 2.36mm; the waste polyphenyl regenerated particles are crushed particles of recycled waste foam box foam plates, and the particle size is 1-2mm and 2-3mm; the admixture is a mixture of blast furnace slag powder and aluminate cement, and the proportion of the blast furnace slag powder to the aluminate cement is 1:1; the rare earth oxide is cerium oxide and is purchased from Baotou Huamei rare earth high-tech limited; the composite additive is a polycarboxylic acid water reducing agent and an organic phosphate defoaming agent, and the mass ratio of the polycarboxylic acid water reducing agent to the organic phosphate defoaming agent is 1.5.
The preparation method of the gypsum-based comprehensive modified steel structure fireproof coating comprises the following steps: pouring weighed regenerated alpha-high-strength gypsum, sepiolite, brucite fiber and admixture into a mixer according to the weight ratio, stirring, adjusting the speed to 300 r/min, mixing for 2min, adding rare earth cerium oxide, a polycarboxylic acid water reducing agent and organic phosphate into the mixer, continuously stirring for 2min, and pouring waste polyphenyl regenerated particles, floating beads and perlite into the mixer until the waste polyphenyl regenerated particles, the floating beads and the perlite are uniformly mixed to obtain finished powder.
The application method of the gypsum-based comprehensive modified steel structure fireproof coating comprises the following steps: and (3) stirring the finished product powder and water according to the mass ratio of 1:1 to a state suitable for construction, and directly spraying the mixture on the surface of a steel structure, wherein the thickness of the coating is 30mm.
Example 3
In the embodiment, a gypsum-based comprehensive modified steel structure fireproof coating is provided, and the fireproof coating comprises the following raw materials in parts by mass: 110 parts of tap water, and the powder material comprises the following components in parts by mass: 57 parts of regenerated alpha-high-strength gypsum, 5 parts of sepiolite, 10 parts of brucite fiber, 2 parts of hollow waste polyphenyl regenerated particles, 10 parts of floating beads, 10 parts of perlite, 3 parts of modified admixture, 3 parts of rare earth oxide and 2 parts of composite additive.
Wherein the sepiolite is purchased from Hebei Kun New Material science and technology Limited, first-grade product; the brucite fiber is purchased from Shijiazhuang Mayun building materials Co., ltd, first-grade product; the floating beads are purchased from a Huichang floating bead factory from Chenchen Tai, and the fineness is 30 meshes; perlite is purchased from Touchenfang New popular Filter aid Co., ltd, and the fineness is 2.36mm; the waste polyphenyl regenerated particles are crushed particles of recycled waste foam box foam plates, and the particle size is 1-2mm and 2-3mm; the admixture is a mixture of blast furnace slag powder and aluminate cement, and the proportion of the blast furnace slag powder to the aluminate cement is 1:1; the rare earth oxide is cerium oxide, and is purchased from Baotou Huamei rare earth high-tech limited; the composite additive is a polycarboxylic acid water reducing agent and an organic phosphate defoaming agent, and the mass ratio of the polycarboxylic acid water reducing agent to the organic phosphate defoaming agent is 1:1.
The preparation method of the gypsum-based comprehensive modified steel structure fireproof coating comprises the following steps: pouring weighed regenerated alpha-high-strength gypsum, sepiolite, brucite fiber and admixture into a mixer according to the weight ratio, stirring, adjusting the speed to 300 r/min, mixing for 2min, adding rare earth cerium oxide, a polycarboxylic acid water reducing agent and organic phosphate into the mixer, continuously stirring for 2min, and pouring waste polyphenyl regenerated particles, floating beads and perlite into the mixer until the waste polyphenyl regenerated particles, the floating beads and the perlite are uniformly mixed to obtain finished powder.
The application method of the gypsum-based comprehensive modified steel structure fireproof coating comprises the following steps: and (3) stirring the finished product powder and water according to the mass ratio of 1.1 to a state suitable for construction, and directly spraying the mixture on the surface of a steel structure, wherein the thickness of the coating is 30mm.
Example 4
The powder material in the embodiment comprises the following components in parts by mass: 59 parts of regenerated alpha-high-strength gypsum, 5 parts of sepiolite, 10 parts of brucite fiber, 2 parts of hollow waste polyphenyl regenerated particles, 5 parts of floating beads, 10 parts of perlite, 6 parts of modified admixture, 3 parts of rare earth oxide and 2.5 parts of composite additive. The rest of the process was the same as in example 2.
Example 5
The powder material of the embodiment comprises the following components in parts by mass: 56 parts of regenerated alpha-high-strength gypsum, 5 parts of sepiolite, 10 parts of brucite fiber, 3 parts of hollow waste polyphenyl regenerated particles, 7 parts of floating beads, 10 parts of perlite, 6 parts of modified admixture, 3 parts of rare earth oxide and 2.5 parts of composite additive. The rest of the process was the same as in example 2.
Example 6
In the powder of this embodiment, the modifying admixture is blast furnace slag powder and aluminate cement, and the ratio of the two is 2:1, the rest of the same procedure as in example 5.
Comparative example 1
Compared with the examples, the powder material of the comparative example lacks of the modified admixture, namely the fireproof coating comprises the following raw materials and mass components: 100 parts of tap water, and the powder material comprises the following components in parts by mass: 62 parts of regenerated alpha-high-strength gypsum, 5 parts of sepiolite, 10 parts of brucite fiber, 3 parts of hollow waste polyphenyl regenerated particles, 7 parts of floating beads, 10 parts of perlite, 3 parts of rare earth oxide and 2.5 parts of composite additive. The rest of the process was the same as in example 2.
Comparative example 2
Compared with the examples, the powder material of the comparative example is lack of rare earth oxide, namely the fireproof coating comprises the following raw materials and mass components: 100 parts of tap water, and the powder material comprises the following components in parts by mass: 59 parts of regenerated alpha-high-strength gypsum, 5 parts of sepiolite, 10 parts of brucite fiber, 3 parts of hollow waste polyphenyl regenerated particles, 7 parts of floating beads, 10 parts of perlite, 6 parts of modified admixture and 2.5 parts of composite additive. The rest of the process was the same as example 2.
The fireproof coatings prepared in the examples 1~6 and the comparative example 1~2 are indoor non-intumescent steel structure fireproof coatings, and the obtained fireproof coatings are subjected to physical and chemical performance and fire resistance tests according to the regulations in GB14907-2018 Steel structure fireproof coatings. The results of the measurements are shown in the following table:
TABLE 1 test results of main properties of fire-retardant coatings
Refractory time/h Strong adhesion degree/MPa Dry density- kg·m -3 Water resistance Resistance to cold and heat cycles
Standard of reference Adopting building fiber fire hazard heating condition, resisting The fire limit is not less than 2.0h ≥0.04 ≤500 No layer and hair growing in 24h Bubbling, flaking off After 15 times of tests, the coating has no cracking or stripping, Foaming phenomenon
Example 1 3.2h 0.16 405 No layer and hair growing in 24h Bubbling and flaking off After 15 times of tests, the coating has no cracking, peeling or peeling Bubble phenomenon
Example 2 3.1h 0.15 407 No layer and hair growing in 24h Bubbling, flaking off After 15 times of tests, the coating has no cracking, peeling or peeling Bubble phenomenon
Example 3 2.8h 0.13 403 No layer and hair growing in 24h Bubbling and flaking off After 15 times of tests, the coating has no cracking, peeling or peeling Bubble phenomenon
Example 4 3.4h 0.16 398 No layer and hair growing in 24h Bubbling, flaking off After 15 times of tests, the coating has no cracking, peeling or peeling Bubble phenomenon
Example 5 2.9h 0.15 396 No layer and hair growing in 24h Bubbling, flaking off After 15 times of tests, the coating has no cracking, peeling or peeling Bubble phenomenon
Example 6 3.5h 0.17 396 No layer and hair growing in 24h Bubbling, flaking off After 15 times of tests, the coating has no cracking, peeling or peeling Bubble phenomenon
Comparative example 1 2.2h 0.11 403 No generation of hair layer for 24h Bubbling and flaking off After 15 tests, the coating had no cracking and slight cracking Flaking and bubbling phenomena
Comparative example 2 2.0h 0.14 406 No layer and hair growing in 24h Bubbling, flaking off After 15 times of tests, the coating has no cracking, peeling or peeling Bubble phenomenon
As can be seen from the measurement results in the table above, compared with the fireproof coating obtained by the comparative example, the fireproof coating provided by the invention has good fireproof performance and good bonding strength by adding the modification admixture and the rare earth oxide to comprehensively modify the gypsum; meanwhile, most of the materials used by the method adopt industrial solid waste recycling products as raw materials, the cost is low, the method is simple and feasible, and the maximum utilization of resources can be realized.
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations will be apparent to persons skilled in the art upon consideration of the foregoing description. And obvious variations are contemplated as falling within the scope of the present invention. Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Claims (9)

1. A gypsum-based comprehensive modified steel structure fireproof coating is characterized in that: the powder comprises the following components: 35-65 parts of alpha-high-strength gypsum, 5-15 parts of sepiolite, 5-10 parts of brucite fiber, 1-3 parts of polyphenyl granules, 5-10 parts of floating beads, 10-20 parts of perlite, 3-10 parts of admixture, 3-10 parts of rare earth oxide and 1-3 parts of composite additive by mass; wherein the admixture is a mixture of blast furnace slag powder and aluminate cement; the composite additive is any one or a mixture of a plurality of water reducing agent, defoaming agent, retarder and air entraining agent; the powder material and the water are mixed according to the mass ratio of 1.8-1.2.
2. The gypsum-based fireproof coating for the comprehensively modified steel structure as claimed in claim 1, wherein the α -high-strength gypsum is regenerated α -high-strength gypsum prepared by high-temperature calcination and aging of desulfurized gypsum, and comprises the main componentIs CaSO 4 ·1/2H 2 O。
3. The gypsum-based comprehensive modified steel structure fireproof coating as claimed in claim 1, wherein the polyphenyl granules are crushed granules obtained by crushing waste foam boxes and foam boards, and the particle size is 1-3mm; the particle size range of the floating beads is 0.25-0.83mm; the value range of the perlite particle size is 1-3mm.
4. The gypsum-based comprehensive modified steel structure fireproof coating as claimed in claim 1, wherein the blast furnace slag powder is blast furnace slag produced by water quenching of solid waste blast furnace slag, is ground into powder with 400 meshes or more and an activity index of 75% or more, and comprises the following main components: 37.58% CaO,33.65% SiO 2 13.70% of Al 2 O 3 0.88% of Fe 2 O 3 9.75% of MgO and 0.14% of SO 3 0.31% MnO,1.77% TiO 2 2.22% lg; the aluminate cement is CA-50 type aluminate cement.
5. The gypsum-based comprehensive modified steel structure fireproof coating as claimed in claim 1, wherein the rare earth oxide is lanthanum oxide or cerium oxide.
6. The gypsum-based comprehensive modified steel structure fireproof coating as claimed in claim 1, wherein the water reducing agent is any one of a water-soluble resin water reducing agent and a polycarboxylic acid water reducing agent; the defoaming agent is any one of higher fatty acid, polyethylene glycol, polypropylene glycol, organic phosphate and modified organic silicon resin; the retarder is organic acid and soluble salt retarder or alkaline phosphate retarder thereof; the air entraining agent is alkyl and alkyl arene sulfonic acid or fatty alcohol sulfonate.
7. A preparation method of gypsum-based comprehensive modified steel structure fireproof paint is characterized by comprising the following steps:
respectively weighing alpha-high-strength gypsum, sepiolite, brucite fiber, polyphenyl granules, floating beads, perlite, admixture, rare earth oxide and composite additive according to the mass ratio of claim 1; then mixing the materials according to the following batches respectively; firstly, pouring alpha-high-strength gypsum, sepiolite, brucite fiber and admixture into a mixer for premixing; then, pouring the rare earth oxide and the composite additive into a mixer for mixing; then, pouring the polyphenyl granules, the floating beads and the perlite into a mixer to be uniformly mixed; and finally, adding water for mixing to obtain the gypsum-based comprehensive modified steel structure fireproof coating.
8. A method for applying gypsum-based comprehensive modified steel structure fireproof coating, which is characterized in that the fireproof coating prepared according to claim 7 is sprayed on the surface of a steel structure to form a fireproof layer.
9. The method for applying the gypsum-based comprehensive modified steel structure fireproof coating as claimed in claim 8, wherein the spraying thickness is 20-60mm.
CN202211108353.4A 2022-09-13 2022-09-13 Gypsum-based comprehensive modified steel structure fireproof coating and preparation method and application method thereof Pending CN115403946A (en)

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