Steel structure fireproof coating and preparation method thereof

Abstract

The invention discloses a steel structure fireproof coating and a preparation method thereof, the steel structure fireproof coating comprises a main coating and a surface coating, the main coating comprises an inorganic cementing material, an inorganic lightweight thermal insulation aggregate material, a fireproof additive, a reinforcing material, a filler, melanin and copper-plated iron powder, and the overall proportion of the copper-plated iron powder is 5-8%; the surface coating comprises polyacrylate and polyurethane, the ratio of the polyacrylate to the polyurethane is 8: 1, the surface coating and the main body coating are separately placed, and the surface of the integral coating is coated with the surface coating; the preparation method of the fireproof coating for the steel structure comprises the following specific steps: S1, preparing raw materials; s2, mixing the raw materials; s3, plating copper on iron powder; s4, adding iron powder; the steel structure fireproof coating and the preparation method thereof have the advantages that the reflection effect of the coating on ultraviolet rays can be optimized to a great extent, the service life of the coating is prolonged, and the maintenance frequency is further reduced.

Description

Technical Field

[0001] The invention relates to the technical field of fire retardant coatings for steel structures, and in particular to a fire retardant coating for steel structures and a preparation method thereof. Background Art

[0002] Steel is a non-combustible building material with earthquake resistance and bending resistance. In practical applications, steel can not only relatively increase the load capacity of buildings, but also meet the needs of architectural design aesthetics; it also avoids the defects of concrete and other building materials that cannot be bent or stretched. Therefore, steel is favored by the construction industry. It is common to use steel in single-story, multi-story, skyscrapers, factories, warehouses, waiting rooms, airport lounges, etc. However, as a building material, steel has some unavoidable defects in fire prevention. Its mechanical properties, such as yield point, tensile strength and elastic modulus, will drop sharply due to the increase in temperature.

[0003] Applying fireproof material on the surface of steel can provide fireproof protection, further protecting the steel's support force at high temperatures and its service life. During outdoor use of fireproof materials, ultraviolet radiation can have a direct impact on their lifespan. In order to achieve the effect of anti-ultraviolet radiation, fireproof materials are generally set to black that can reflect ultraviolet radiation. However, the reflection of ultraviolet radiation by black alone cannot effectively protect the coating. As a result, fireproof coatings require regular maintenance, which will bring greater work difficulty. Summary of the invention

[0004] The invention discloses a fire retardant coating for steel structure and a preparation method thereof, aiming to solve the technical problem that the reflection of ultraviolet rays by black alone cannot better protect the coating, which results in the need for regular maintenance of the fire retardant coating and brings great difficulty in the work.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A fireproof coating for steel structure, comprising a main coating and a surface coating, wherein the main coating comprises an inorganic binder, an inorganic lightweight insulating aggregate material, a fireproof additive, a reinforcing material, a filler, a melanin and a copper-plated iron powder, and the overall proportion of the copper-plated iron powder is 5-8%, and the surface coating comprises polyacrylate and polyurethane, and the ratio of polyacrylate to polyurethane is 8:1, and the surface coating and the main coating are placed separately, and the surface coating is applied to the surface of the overall coating;

[0007] A method for preparing a fire retardant coating for a steel structure comprises the following specific steps:

[0008] S1: Raw material preparation: prepare inorganic binder, inorganic lightweight insulation aggregate, fire retardant additive, reinforcing material, filler and melanin, and distinguish between polyacrylate and polyurethane;

[0009] S2: Mix raw materials: Place all raw materials into a mixer for uniform mixing to form a coating slurry and a surface coating;

[0010] S3: Copper plating on iron powder: Prepare iron powder, screen out larger particles through a screening device, and copper plate its surface through an electroplating device;

[0011] S4: Add iron powder: Mix the copper-plated iron powder into the raw materials, and the overall proportion of the copper-plated iron powder is 5-8%;

[0012] S5: Filter zirconium beads: Filter the zirconium beads through a grinding device, and store the smaller-diameter particles separately;

[0013] S6: Grind the slurry: Place the filtered large-diameter zirconium beads and the slurry into a grinding device for grinding;

[0014] S7: Filter: Place the ground slurry in a filtering device for filtering to filter out the particles and impurities in the slurry;

[0015] S8: Package: Package and store the filtered coating finished product.

[0016] By adding copper-plated iron powder and surface coating, adding copper-plated iron powder, and during construction, applying the surface coating again on the surface of the non-foaming fireproof coating. Thus, in the state where the thin-coated surface coating is cured and the main coating is not cured, by the action of devices such as magnetic blocks on the coating surface, the copper-plated iron powder floats on the coating surface. Under the triple reflective effects of the copper-plated iron powder, surface coating, and melanin, the reflection effect of the coating on ultraviolet rays can be optimized to a great extent, the service life of the coating can be greatly extended, and the maintenance frequency can be further reduced.

[0017] In a preferred solution, in the S3, the grinding device for filtering zirconium beads includes a grinding cylinder, and a feeding port is provided on the inner wall of the top end of the grinding cylinder. A screening mechanism and a feeding mechanism are simultaneously provided at the top end of the grinding cylinder. The screening mechanism includes a screening cylinder. A bottom support frame is fixedly connected to the inner wall of the bottom end of the screening cylinder, and a filter screen is provided on the bottom support frame. A second eccentric support shaft is fixedly connected to the outer wall of the bottom end of the bottom support frame, and the second eccentric support shaft is connected to a first eccentric support shaft through a hinge. A magnetic attraction plate is provided on the connection surface of the second eccentric support shaft and the first eccentric support shaft. The first eccentric support shaft is fixed to the outer wall of the top end of the second turntable. A stepping motor is fixedly connected to the outer wall of the bottom end of the second turntable, and a support sleeve is wrapped outside the stepping motor. A guide groove is fixedly connected to the outer wall of the support sleeve, and a discharge hole is penetrated through the inner wall of one side of the guide groove. A support rod is fixedly connected to the outer wall of the top end of the screening cylinder, and one end of the support rod is hinged to a second connecting rod. The other end of the second connecting rod is movably connected to a first turntable, and the bottom end of the first turntable is movably connected to an L-shaped bracket.

[0018] By providing a screening mechanism, a large amount of pickling beads need to be added for grinding the fireproof coating during grinding. However, due to the inability to ensure the uniformity of the diameter of the pickling beads, the pickling beads with a smaller diameter will affect the grinding effect. The screening mechanism can screen out the pickling beads with a smaller diameter and reserve the pickling beads with a larger diameter for use, thereby ensuring the quality of the pickling beads used and further ensuring the grinding quality.

[0019] In a preferred embodiment, the feeding mechanism includes a sealing door, and the bottom end of the sealing door is connected to the inner wall of one side of the screening cylinder through a hinge. The outer walls on both opposite sides of the sealing door are respectively connected to a first air rod through a first hinge seat, and the other ends of the first air rods are simultaneously connected to the outer wall of the screening cylinder through a first hinge seat. A support frame is fixedly connected to the outer wall of one side of the guiding groove, and limiting sliding grooves are respectively arranged on the inner walls on both opposite sides of the support frame. A first connecting rod is movably connected in each limiting sliding groove, and the other end of the first connecting rod is movably connected to one side of the L-shaped bracket. A connecting plate is fixedly connected to the outer wall of one side of the L-shaped bracket, and a second air rod is connected to the outer wall of one side of the connecting plate through a second hinge seat. The other end of the second air rod is connected to one side of the support frame through a second hinge seat.

[0020] By providing a feeding mechanism, the sealing door is opened by the stretching of the first air rod, and then the whole screening cylinder is tilted by the elongation of the second air rod and driven by the second connecting rod, so as to realize the automatic dumping of the large-particle pickling beads, effectively replacing manual transfer and improving work efficiency.

[0021] As can be seen from the above, a steel structure fireproof coating includes a main coating and a surface coating. The main coating includes an inorganic binder, an inorganic lightweight heat-insulating aggregate material, a fireproof additive, a reinforcing material, a filler, melanin, and copper-plated iron powder, and the overall proportion of the copper-plated iron powder is 5-8%. The surface coating includes polyacrylate and polyurethane, and the ratio of polyacrylate to polyurethane is 8:1. The surface coating and the main coating are placed separately, and the surface coating is applied to the surface of the whole coating. The steel structure fireproof coating and its preparation method provided by the present invention have the technical effects that under the triple light-reflecting effects of copper-plated iron powder, surface coating, and melanin, the reflection effect of the coating on ultraviolet rays can be optimized to a great extent, the service life of the coating can be greatly extended, and the maintenance frequency can be further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a specific flowchart of a preparation method of a steel structure fireproof coating proposed by the present invention.

[0023] Figure 2 It is a schematic diagram of the overall structure of a grinding device in a preparation method of a steel structure fireproof coating proposed by the present invention.

[0024] Figure 3Partial structural schematic diagram of the grinding equipment in a steel structure fireproof coating and its preparation method proposed by the present invention.

[0025] Figure 4 Cross-sectional view of the grinding equipment in a steel structure fireproof coating and its preparation method proposed by the present invention.

[0026] Figure 5 Schematic diagram of the connection structure of the first eccentric support shaft and the second eccentric support shaft of the grinding equipment in the preparation method of a steel structure fireproof coating proposed by the present invention.

[0027] In the figure: 1, grinding cylinder; 2, feeding mechanism; 3, screening mechanism; 4, feeding port; 201, sealing door; 202, first hinge seat; 203, first air rod; 204, support frame; 205, limit sliding groove; 206, first connecting rod; 207, second hinge seat; 208, second air rod; 209, connecting plate; 301, L-shaped bracket; 302, first turntable; 303, second connecting rod; 304, support rod; 305, screening cylinder; 306, guiding groove; 307, discharge hole; 308, bottom support frame; 309, filter screen; 310, first eccentric support shaft; 311, second turntable; 312, support sleeve; 313, stepping motor; 314, second eccentric support shaft; 315, magnetic attraction plate. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0029] A steel structure fireproof coating and its preparation method disclosed by the present invention are mainly applied to the scenarios where steel structure fireproof coatings are used.

[0030] Refer to Figure 1, a fireproof coating for steel structures, comprising a main coating and a surface coating. The main coating includes an inorganic binder, an inorganic lightweight heat-insulating aggregate material, a fireproof additive, a reinforcing material, a filler, melanin, and copper-plated iron powder, and the overall proportion of the copper-plated iron powder is 5-8%. The surface coating includes polyacrylate and polyurethane, and the ratio of polyacrylate to polyurethane is 8:1. The surface coating and the main coating are placed separately, and the surface coating is applied to the surface of the overall coating. Among them, the inorganic binder, the inorganic lightweight heat-insulating aggregate material, the fireproof additive, the reinforcing material, the filler, and melanin are the main materials of the non-foaming fireproof coating. By adding and uniformly mixing copper-plated iron powder therein, and during construction, applying the surface coating again on the surface of the non-foaming fireproof coating. Among them, polyacrylate and polyurethane have good reflectivity, and their curing speed is faster than that of the main coating. Thus, in the state where the surface coating is cured and the main coating is not cured in the thin coating, by the action of equipment such as magnetic blocks on the surface of the coating, the copper-plated iron powder floats on the surface of the coating. Thus, under the triple reflection effect of the copper-plated iron powder, the surface coating, and melanin, the reflection effect of the coating on ultraviolet rays can be optimized to a large extent, the service life of the coating can be greatly extended, and the maintenance frequency can be further reduced.

[0031] Refer to Figure 1 , a preparation method of a fireproof coating for steel structures, comprising the following specific steps:

[0032] S1: Raw material preparation: Prepare an inorganic binder, an inorganic lightweight heat-insulating aggregate material, a fireproof additive, a reinforcing material, a filler, and melanin, and separately prepare polyacrylate and polyurethane;

[0033] S2: Mix raw materials: Put all the raw materials into a mixer for uniform mixing to form a coating slurry and a surface coating;

[0034] S3: Copper plating on iron powder: Prepare iron powder, and screen out larger particles through a screening device, and copper-plate its surface through an electroplating device. The setting of the iron powder can ensure that it can be smoothly drawn out of the surface by magnetic attraction subsequently, and copper-plating its surface is based on the ultraviolet reflectivity of copper to improve the ultraviolet reflectivity of the iron powder surface;

[0035] S4: Add iron powder: Mix the copper-plated iron powder into the raw materials, and the overall proportion of the copper-plated iron powder is 5-8%;

[0036] S5: Filter pickaxe beads: Filter the pickaxe beads through a grinding device, filter out the smaller-diameter particles and store them separately. The smaller-diameter pickaxe beads will affect the grinding effect of the slurry;

[0037] S6: Grind the slurry: Put the filtered larger-diameter pickaxe beads together with the slurry into a grinding device for grinding;

[0038] S7: Filtration: The ground slurry is placed in a filtration device for filtration to remove particles and impurities in the slurry;

[0039] S8: Packaging: The filtered finished coating is packaged and stored.

[0040] Refer to Figures 2 - 4 , in a preferred embodiment, in S3, the grinding device in the pick bead filtration includes a grinding cylinder 1, and a feed inlet 4 is provided on the inner wall of the top end of the grinding cylinder 1. A screening mechanism 3 and a feeding mechanism 2 are simultaneously provided at the top end of the grinding cylinder 1. The screening mechanism 3 includes a screening cylinder 305. A bottom support frame 308 is fixedly connected to the inner wall of the bottom end of the screening cylinder 305, and a filter screen 309 is provided on the bottom support frame 308.

[0041] Refer to Figure 4 and Figure 5 , in a preferred embodiment, a second eccentric support shaft 314 is fixedly connected to the outer wall of the bottom end of the bottom support frame 308, and the second eccentric support shaft 314 is connected to a first eccentric support shaft 310 through a hinge. A magnetic attraction plate 315 is provided on the connection surface of the second eccentric support shaft 314 and the first eccentric support shaft 310, and the first eccentric support shaft 310 is fixed to the outer wall of the top end of the second turntable 311.

[0042] Refer to Figure 4 , in a preferred embodiment, a stepping motor 313 is fixedly connected to the outer wall of the bottom end of the second turntable 311, and a support sleeve 312 is wrapped outside the stepping motor 313. A guide groove 306 is fixedly connected to the outer wall of the support sleeve 312, and a discharge hole 307 is provided through the inner wall of one side of the guide groove 306.

[0043] Refer to Figure 3 and Figure 4 , in a preferred embodiment, a support rod 304 is fixedly connected to the outer wall of the top end of the screening cylinder 305, and one end of the support rod 304 is hinged to a second connecting rod 303. The other end of the second connecting rod 303 is movably connected to a first turntable 302, and the bottom end of the first turntable 302 is movably connected to an L-shaped bracket 301. A large amount of pick beads need to be added to grind the fireproof coating during grinding. Since the diameters of the pick beads cannot be guaranteed to be uniform, the pick beads with smaller diameters will affect the grinding effect and even cause blockage. Before grinding, the pick beads are placed in the screening cylinder 305. The stepping motor 313 drives the second turntable 311 to rotate, drives the screening cylinder 305 to rotate through the first eccentric support shaft 310, drives the pick beads to move in the screening cylinder 305, so that the pick beads with smaller diameters fall into the guide groove 306 and are discharged, leaving the pick beads with larger diameters for standby. In this way, the use quality of the pick beads can be guaranteed, and the grinding quality can be further guaranteed.

[0044] Refer to Figure 2, in a preferred embodiment, the blanking mechanism 2 includes a sealing door 201, and the bottom end of the sealing door 201 is connected to one inner wall of the screening cylinder 305 through a hinge. The opposite outer walls of the sealing door 201 are respectively connected to a first air rod 203 through a first hinge seat 202, and the other ends of the first air rods 203 are simultaneously connected to the outer wall of the screening cylinder 305 through the first hinge seat 202.

[0045] Refer to Figure 2 , in a preferred embodiment, a support frame 204 is fixedly connected to one outer wall of the guide groove 306, and limiting sliding grooves 205 are respectively arranged on the opposite inner walls of the support frame 204. A first connecting rod 206 is movably connected in each limiting sliding groove 205, and the other end of the first connecting rod 206 is movably connected to one side of the L-shaped bracket 301.

[0046] Refer to Figure 2 , in a preferred embodiment, a connecting plate 209 is fixedly connected to one outer wall of the L-shaped bracket 301, and a second air rod 208 is connected to one side of the connecting plate 209 through a second hinge seat 207. The other end of the second air rod 208 is connected to one side of the support frame 204 through the second hinge seat 207. By the stretching of the first air rod 203 and the limit of the hinge, the sealing door 201 is driven to open and placed at the feeding port 4 position. Then, through the elongation of the second air rod 208, the first connecting rod 206 moves along the limiting sliding groove 205, and the L-shaped bracket 301 is pulled synchronously. The entire screening cylinder 305 is driven to tilt through the second connecting rod 303, causing a bend at the connection between the first eccentric support shaft 310 and the second eccentric support shaft 314. Thus, the automatic dumping of large-particle pick beads can be realized, effectively replacing manual transfer and improving work efficiency.

[0047] Working principle: Inorganic binders, inorganic lightweight thermal insulation aggregate materials, fire retardant additives, reinforcing materials, fillers, and melanin in the coating are the main materials of the non-foaming fire retardant coating. By adding and uniformly mixing copper-plated iron powder in it, and during construction, applying a surface coating again on the surface of the non-foaming fire retardant coating. Among them, polyacrylate and polyurethane have good reflectivity, and their curing speed is faster than that of the main coating. Thus, in the state where the thin-coated surface coating is cured and the main coating is not cured, by the action of equipment such as magnetic blocks on the coating surface, the copper-plated iron powder floats on the coating surface. Thus, under the triple reflection effect of the copper-plated iron powder, the surface coating, and melanin, the reflection effect of the coating on ultraviolet rays can be optimized to a great extent, the service life of the coating can be greatly extended, and the maintenance frequency can be further reduced. When grinding the fire retardant coating, a large amount of pick beads need to be added to grind the coating. However, due to the diameter of the pick beads not being able to ensure uniformity, pick beads with a smaller diameter will affect the grinding effect and even cause blockage. Before grinding, place the pick beads in the screening cylinder 305. Drive the second turntable 311 to rotate through the stepper motor 313, drive the screening cylinder 305 to rotate through the first eccentric support shaft 310, drive the pick beads to move in the screening cylinder 305, so that the pick beads with a smaller diameter fall into the guide groove 306 and are discharged, leaving the pick beads with a larger diameter for standby. Thus, the quality of the pick beads used can be guaranteed, and the grinding quality can be further guaranteed. At the same time, drive the sealing door 201 to open through the stretching of the first air rod 203 and the limit of the hinge, place it on the feeding port 4. Then, through the elongation of the second air rod 208, make the first connecting rod 206 move along the limit sliding groove 205, and synchronously pull the L-shaped bracket 301, drive the entire screening cylinder 305 to tilt through the second connecting rod 303, so that the connection between the first eccentric support shaft 310 and the second eccentric support shaft 314 is bent. Thus, the automatic dumping of large-particle pick beads can be realized, effectively replacing manual transfer and improving work efficiency.

[0048] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A fire retardant coating for steel structure, comprising a main coating and a surface coating, characterized in that: The main coating includes inorganic binder, inorganic lightweight insulation aggregate material, fire retardant additive, reinforcing material, filler, melanin and copper-plated iron powder, and the overall proportion of copper-plated iron powder is 5-8%. The surface coating includes polyacrylate and polyurethane, and the ratio of polyacrylate to polyurethane is 8:

1. The surface coating and the main coating are placed separately, and the surface coating is applied to the surface of the overall coating.

2. The method for preparing a fire retardant coating for steel structure according to claim 1, applied to the fire retardant coating for steel structure according to claim 1, characterized in that: The specific steps include: S1: Raw material preparation: prepare inorganic binder, inorganic lightweight insulation aggregate, fire retardant additive, reinforcing material, filler and melanin, and distinguish between polyacrylate and polyurethane; S2: Mixing raw materials: Put all raw materials into a mixer and mix them evenly to form coating slurry and surface coating; S3: Copper plating of iron powder: prepare iron powder, screen out larger particles through screening equipment, and plate copper on its surface through electroplating equipment; S4: Adding iron powder: mixing the copper-plated iron powder into the raw materials, wherein the copper-plated iron powder accounts for 5-8% of the total; S5: Pick bead filtration: The pick bead is filtered through a grinding device to filter out particles with smaller diameters and store them separately; S6: Slurry grinding: the filtered large-particle pick beads are connected to the slurry and placed in a grinding device for grinding; S7: Filtration: The ground slurry is placed in a filtration device for filtration to filter out particles and impurities in the slurry; S8: Packaging: Packaging and storing the filtered paint products.

3. The method for preparing a fire retardant coating for steel structure according to claim 2, characterized in that: The grinding equipment in the pick bead filtration described in S3 includes a grinding cylinder (1), and a feed port (4) is provided on the inner wall at the top end of the grinding cylinder (1), and a screening mechanism (3) and a feeding mechanism (2) are also provided on the top end of the grinding cylinder (1), and the screening mechanism (3) includes a screening cylinder (305), and a bottom support frame (308) is fixedly connected to the inner wall at the bottom end of the screening cylinder (305), and a filter screen (309) is provided on the bottom support frame (308).

4. The method for preparing a fire retardant coating for steel structure according to claim 3, characterized in that: The bottom outer wall of the bottom support frame (308) is fixedly connected to a second eccentric support shaft (314), and the second eccentric support shaft (314) is connected to the first eccentric support shaft (310) via a hinge, a magnetic attraction plate (315) is provided on the connecting surface between the second eccentric support shaft (314) and the first eccentric support shaft (310), and the first eccentric support shaft (310) is fixed to the top outer wall of the second turntable (311).

5. The method for preparing a fire retardant coating for steel structure according to claim 4, characterized in that: A stepper motor (313) is fixedly connected to the outer wall of the bottom end of the second turntable (311), and the stepper motor (313) is wrapped with a support sleeve (312). The outer wall of the support sleeve (312) is fixedly connected to a guide groove (306), and a discharge hole (307) is provided through the inner wall of one side of the guide groove (306).

6. The method for preparing a fire retardant coating for steel structure according to claim 5, characterized in that: The top outer wall of the screening cylinder (305) is fixedly connected to a support rod (304), one end of the support rod (304) is hinged to a second connecting rod (303), the other end of the second connecting rod (303) is movably connected to a first rotating disk (302), and the bottom end of the first rotating disk (302) is movably connected to an L-shaped bracket (301).

7. The method for preparing a fire retardant coating for steel structure according to claim 5, characterized in that: The unloading mechanism (2) comprises a sealing door (201), and the bottom end of the sealing door (201) is connected to an inner wall of one side of the screening cylinder (305) through a hinge, and the outer walls on both sides of the sealing door (201) facing each other are respectively connected to a first gas rod (203) through a first hinge seat (202), and the other end of the first gas rod (203) is simultaneously connected to the outer wall of the screening cylinder (305) through the first hinge seat (202).

8. The method for preparing a fire retardant coating for steel structure according to claim 7, characterized in that: One side outer wall of the guide groove (306) is fixedly connected to a support frame (204), and the inner walls on both sides facing each other of the support frame (204) are respectively provided with limiting sliding grooves (205), and each limiting sliding groove (205) is movably connected to a first connecting rod (206), and the other end of the first connecting rod (206) is movably connected to one side of the L-shaped bracket (301).

9. The method for preparing a fire retardant coating for steel structure according to claim 8, characterized in that: One side outer wall of the L-shaped bracket (301) is fixedly connected to a connecting plate (209), and one side outer wall of the connecting plate (209) is connected to a second gas rod (208) via a second hinge seat (207), and the other end of the second gas rod (208) is connected to one side of the support frame (204) via a second hinge seat (207).

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