A fireproof and heat-insulating coating for steel structures, its preparation method and application

Abstract

This invention relates to a fire-resistant and heat-insulating coating for steel structures, its manufacturing method, and its application. It addresses the technical problems of existing methods that combine aluminosilicate cotton and perlite fireproof boards to protect steel structures, which suffer from poor fire protection and low fire resistance. The fire-resistant and heat-insulating coating of this invention is made from silicate cement, expanded vermiculite, expanded perlite, calcium carbonate, magnesium hydroxide, aluminum hydroxide, VAE, talc, reinforcing fibers, dispersant, hydroxyethyl cellulose, and water in a specific ratio. Applied to fire-resistant and heat-insulating steel column cladding systems, it improves upon existing methods that combine aluminosilicate cotton and perlite fireproof boards. Specifically, while maintaining the same protective thickness, the thickness of the perlite fireproof board is kept constant, and a portion of the aluminosilicate cotton is replaced with a heat-insulating board made from the fire-resistant and heat-insulating coating of this invention. This significantly slows down the temperature rise of the steel column, resulting in better fire protection and improved fire resistance.

Description

Technical Field

[0001] This invention belongs to the field of fireproof materials technology, specifically relating to a fireproof and heat-insulating coating for steel structures, its preparation method and application. Background Technology

[0002] Steel structures are commonly used in various locations such as high-rise buildings, factories, and bridges. In buildings with steel structures, fire protection is necessary to improve their safety. This protection slows down the temperature rise of the steel structure in the event of a fire, preventing it from losing its load-bearing capacity and collapsing, thus buying time for evacuation and rescue, and reducing losses.

[0003] Existing fire protection measures for steel structures, which combine aluminum silicate cotton and perlite fireproof boards, have technical problems with the rapid and high temperature rise of the steel structure during a fire. Specifically, under the dual protection of aluminum silicate cotton and fireproof boards, the temperature of the steel structure can rise to as high as 538 degrees Celsius within one hour, resulting in poor fire protection and low fire resistance of the steel structure. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide a fireproof and heat-insulating coating for steel structures, its preparation method and application, to solve the technical problem that the existing method of protecting steel structures by combining aluminum silicate cotton and perlite fireproof board has poor fire protection effect and poor fire resistance of steel structures.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A fireproof and heat-insulating coating for steel structures is made from the following raw materials in parts by weight: 30-40 parts silicate cement, 25-30 parts expanded vermiculite, 15-20 parts expanded perlite, 5-10 parts calcium carbonate, 10-15 parts magnesium hydroxide, 5-10 parts aluminum hydroxide, 10-15 parts VAE, 2-5 parts talc, 2-5 parts reinforcing fiber, 0.5-1 part dispersant, 0.1-0.2 parts hydroxyethyl cellulose, and 30-50 parts water.

[0006] Furthermore, the dispersant is sodium hexametaphosphate.

[0007] Furthermore, the reinforcing fiber is any one or more of glass fiber, aluminosilicate fiber, and ceramic fiber.

[0008] Furthermore, the reinforcing fiber is aluminum silicate fiber.

[0009] A method for preparing a fireproof and heat-insulating coating for steel structures includes the following steps: Step 1: Weigh out the raw materials in portions of each weight; Step 2: Turn on the mixer and adjust the mixer speed to 300~500r / min. Add the weighed dry powder materials, namely silicate cement, expanded vermiculite, expanded perlite, calcium carbonate, magnesium hydroxide, aluminum hydroxide and talc powder, into the mixer in sequence and mix for 5~10min. Step 3: Increase the mixer speed to 800~1000 r / min and continue mixing for 15-20 minutes to accelerate the mixing of dry powder materials in the mixer; Step 4: Reduce the mixer speed to 300~500r / min, slowly and evenly sprinkle the weighed aluminum silicate fiber into the dry powder mixture being stirred, and continue stirring for 5~10min; Step 5: Increase the mixer speed to 800~1800 r / min and continue mixing for 15-20 minutes to accelerate the mixing of aluminum silicate fiber and dry powder material in the mixer; Step 6: Add the weighed sodium hexametaphosphate and hydroxyethyl cellulose to the mixer and continue mixing for 10-15 minutes; Step 7: Reduce the speed of the mixer to 300~500 r / min, and slowly add the weighed water into the mixer and mix for 4~8 minutes; Step 8: Add the weighed VAE, increase the mixer speed to 700~900 r / min, and continue stirring for 10~20 minutes to obtain the fireproof and heat-insulating coating.

[0010] Application of a fire-resistant and heat-insulating coating for steel structures in a fire-resistant and heat-insulating steel column cladding system: The fire-resistant and heat-insulating steel column cladding system includes an I40b I-beam column, aluminum silicate cotton filling the cavity and outer surface of the I40b I-beam column, a heat insulation board covering the periphery of the I40b I-beam column and located outside the aluminum silicate cotton, and a perlite fireproof board covering the heat insulation board; the heat insulation board is formed by air-drying and pressing the fire-resistant and heat-insulating coating.

[0011] Furthermore, two L-shaped keels and several connecting steel strips are distributed opposite each other on the outer periphery of the heat insulation board. The L-shaped keels and connecting steel strips are adjacent to each other and located between the heat insulation board and the floating fireproof board. Self-tapping screws are used to connect the L-shaped keels, connecting steel strips and floating fireproof board.

[0012] Furthermore, the insulation board is 30mm thick, and the beaded fireproof board is 40mm thick.

[0013] Furthermore, the fire resistance and heat insulation test method for the fire-resistant and heat-insulating steel column cladding system is as follows: A thermocouple is connected to an I40b I-beam column. A specimen is fabricated according to the structure of the fire-resistant and heat-insulating steel column cladding system. During specimen fabrication, the thermocouple output is led out of the specimen. Concrete is used to cover both ends of the specimen. The specimen is then placed in a test furnace. The thermocouple output is connected in parallel to the input of the matching display instrument, recording instrument, and electronic regulator via a three-way connector. The output of the electronic regulator is connected to the test furnace. The test furnace is then turned on to burn the specimen for 4.00 hours. During combustion, the temperature of the I40b I-beam column is measured using the thermocouple. The combustion temperature of the test furnace is adjusted using the electronic regulator used with the thermocouple. The temperature of the I40b I-beam column is read using the display instrument used with the thermocouple. The temperature change of the I40b I-beam column is recorded using the recording instrument used with the thermocouple. After combustion, the temperature values ​​of the I40b I-beam columns were recorded, the highest temperature of the I40b I-beam columns was selected, and the average temperature of the I40b I-beam columns was calculated.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention improves the existing method of protecting steel structures by combining aluminum silicate cotton and cenosphere fireproof board. That is, under the premise of the same protective thickness, while keeping the thickness of the cenosphere fireproof board unchanged, the aluminum silicate cotton of a certain thickness is replaced with the heat insulation board of the present invention, which slows down the temperature rise of the steel column to a greater extent, provides better fire protection for the steel structure, and improves the fire resistance of the steel structure.

[0015] The heat insulation board of this invention is formed by air-drying and pressing the fireproof and heat-insulating coating of this invention. The fireproof and heat-insulating coating is made of silicate cement, expanded vermiculite, expanded perlite, calcium carbonate, magnesium hydroxide, aluminum hydroxide, VAE, talc, reinforcing fibers, dispersant, hydroxyethyl cellulose, and water in a certain proportion. When the heat insulation board of this invention is used, in terms of spatial dimension, the use of silicate cement and VAE as binders provides basic strength for the fireproof and heat-insulating coating, enhancing the coating's high-temperature resistance; the composite of inorganic insulating aggregates expanded vermiculite and expanded perlite with fillers calcium carbonate, magnesium hydroxide, and aluminum hydroxide further enhances the coating structure, achieving multi-layered barrier against heat transfer; the use of reinforcing fibers enhances the coating's crack resistance and fire resistance limit, further improving the coating's strength and durability; the addition of talc, dispersant, and hydroxyethyl cellulose adjusts the leveling properties of the coating, making it easier to use.

[0016] In terms of time, from the initial stage of a fire to the later stages, the free water inside the insulation board of this invention first absorbs heat and evaporates. Then, magnesium hydroxide and aluminum hydroxide absorb heat and decompose into oxides and water vapor, reducing heat transfer and slowing down the temperature rise of the steel column. Subsequently, expanded vermiculite and expanded perlite expand when heated, and calcium carbonate decomposes when heated. After expansion, the expanded vermiculite and expanded perlite form a physical barrier inside the insulation board, isolating heat transfer. Calcium carbonate decomposes when heated into calcium oxide and carbon dioxide. Carbon dioxide overflows, and calcium oxide becomes honeycomb-like, further enhancing the insulation capacity of the insulation board. At different stages of the fire, the components inside the insulation board of this invention play their respective roles in isolating the temperature of the fire, slowing down the temperature rise of the steel column, and improving the fire resistance of the steel structure. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of a fire-resistant and heat-insulating steel column cladding system.

[0018] Figure 2 This is a schematic diagram showing the distribution of thermocouples on a steel column.

[0019] Figure 3 for Figure 2 Sectional view along direction AA.

[0020] Figure 4 Appearance of the specimen before and after the fire resistance test. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention. Example

[0022] This embodiment 1 provides a fireproof and heat-insulating coating for steel structures, its preparation method, and its application, as detailed below: Fireproof and heat-insulating coatings: 30 parts of silicate cement; 25 parts of expanded vermiculite; 15 parts expanded perlite; 5 parts calcium carbonate; 10 parts magnesium hydroxide; 5 parts aluminum hydroxide; VAE 10 copies; 2 parts talcum powder; Two parts of aluminum silicate fiber; Sodium hexametaphosphate 0.5 parts; 0.1 parts of hydroxyethyl cellulose; 30 parts water.

[0023] Preparation method of fire-retardant and heat-insulating coating: Step 1: Weigh out the raw materials in portions of each weight; Step 2: Turn on the mixer and adjust the mixer speed to 300~500r / min. Add the weighed dry powder materials, namely 30 parts of silicate cement, 25 parts of expanded vermiculite, 15 parts of expanded perlite, 5 parts of calcium carbonate, 10 parts of magnesium hydroxide, 5 parts of aluminum hydroxide, and 2 parts of talc powder, into the mixer in sequence and mix for 5~10 minutes. Step 3: Increase the mixer speed to 800~1000 r / min and continue mixing for 15-20 minutes to accelerate the mixing of dry powder materials in the mixer; Step 4: Reduce the speed of the mixer to 300~500r / min, slowly and evenly sprinkle the weighed 2 portions of aluminum silicate fiber into the dry powder mixture being stirred, and continue stirring for 5~10 minutes. Step 5: Increase the mixer speed to 800~1800 r / min and continue mixing for 15-20 minutes to accelerate the mixing of aluminum silicate fiber and dry powder material in the mixer; Step 6: Add 0.5 parts of weighed sodium hexametaphosphate and 0.1 parts of hydroxyethyl cellulose to the mixer and continue mixing for 10-15 minutes; Step 7: Reduce the speed of the mixer to 300~500 r / min, and slowly add 30 parts of the weighed water into the mixer and mix for 4~8 minutes; Step 8: Add 10 parts of the weighed VAE, increase the speed of the mixer to 700~900 r / min, and continue stirring for 10~20 minutes to obtain the fireproof and heat-insulating coating.

[0024] Application of fire-retardant and heat-insulating coatings in fire-resistant and heat-insulating steel column cladding systems: The fire-resistant and heat-insulating steel column cladding system includes an I40b I-beam column, aluminum silicate cotton filling the cavity and outer surface of the I40b I-beam column, a heat insulation board covering the periphery of the I40b I-beam column and located outside the aluminum silicate cotton, and a perlite fireproof board covering the heat insulation board; the heat insulation board is made by air drying and pressing the fireproof and heat-insulating coating.

[0025] Two L-shaped keels and several connecting steel strips are distributed opposite each other on the outer perimeter of the insulation board. The L-shaped keels and connecting steel strips are adjacent to each other and located between the insulation board and the foamed fireproof board. Self-tapping screws connect the L-shaped keels, connecting steel strips and foamed fireproof board. The thickness of the L-shaped keels is 0.8mm, and the specifications of the connecting steel strips are 0.8*30mm.

[0026] The insulation board is 30mm thick, and the beaded fireproof board is 40mm thick. Example

[0027] This embodiment 2 provides a fireproof and heat-insulating coating for steel structures, its preparation method, and its application, as detailed below: Fireproof and heat-insulating coatings: 32 parts of silicate cement; 26 parts of expanded vermiculite; 16 portions of expanded perlite; 6 parts calcium carbonate; 12 parts magnesium hydroxide; 6 parts aluminum hydroxide; VAE 12 copies; 2.5 parts talcum powder; 3 parts aluminum silicate fiber; Sodium hexametaphosphate 0.6 parts; 0.15 parts of hydroxyethyl cellulose; 35 parts water.

[0028] Preparation method of fire-retardant and heat-insulating coating: Step 1: Weigh out the raw materials in portions of each weight; Step 2: Turn on the mixer and adjust the mixer speed to 300~500r / min. Add the weighed dry powder materials, namely 32 parts of silicate cement, 26 parts of expanded vermiculite, 16 parts of expanded perlite, 6 parts of calcium carbonate, 12 parts of magnesium hydroxide, 6 parts of aluminum hydroxide, and 2.5 parts of talc powder, into the mixer in sequence and mix for 5~10 minutes. Step 3: Increase the mixer speed to 800~1000 r / min and continue mixing for 15-20 minutes to accelerate the mixing of dry powder materials in the mixer; Step 4: Reduce the speed of the mixer to 300~500r / min, slowly and evenly sprinkle the weighed aluminum silicate fiber into the dry powder mixture being stirred, and continue stirring for 5~10min; Step 5: Increase the mixer speed to 800~1800 r / min and continue mixing for 15-20 minutes to accelerate the mixing of aluminum silicate fiber and dry powder material in the mixer; Step 6: Add 0.6 parts of weighed sodium hexametaphosphate and 0.15 parts of hydroxyethyl cellulose to the mixer and continue mixing for 10-15 minutes. Step 7: Reduce the speed of the mixer to 300~500 r / min, and slowly add 35 parts of the weighed water into the mixer and mix for 4~8 minutes; Step 8: Add 12 parts of the weighed VAE, increase the speed of the mixer to 700~900 r / min, and continue mixing for 10~20 minutes to obtain the fireproof and heat-insulating coating.

[0029] Application of fire-retardant and heat-insulating coatings in fire-resistant and heat-insulating steel column cladding systems: The fire-resistant and heat-insulating steel column cladding system includes an I40b I-beam column, aluminum silicate cotton filling the cavity and outer surface of the I40b I-beam column, a heat insulation board covering the periphery of the I40b I-beam column and located outside the aluminum silicate cotton, and a perlite fireproof board covering the heat insulation board; the heat insulation board is made by air drying and pressing the fireproof and heat-insulating coating.

[0030] Two L-shaped keels and several connecting steel strips are distributed opposite each other on the outer perimeter of the insulation board. The L-shaped keels and connecting steel strips are adjacent to each other and located between the insulation board and the foamed fireproof board. Self-tapping screws connect the L-shaped keels, connecting steel strips and foamed fireproof board. The thickness of the L-shaped keels is 0.8mm, and the specifications of the connecting steel strips are 0.8*30mm.

[0031] The insulation board is 30mm thick, and the beaded fireproof board is 40mm thick. Example

[0032] This embodiment 3 provides a fireproof and heat-insulating coating for steel structures, its preparation method, and its application, as detailed below: Fireproof and heat-insulating coatings: 35 parts of silicate cement; 28 parts of expanded vermiculite; 16 portions of expanded perlite; 7 parts calcium carbonate; 13 parts magnesium hydroxide; 7 parts aluminum hydroxide; VAE 13 copies; 3 parts talcum powder; 3.5 parts of aluminum silicate fiber; Sodium hexametaphosphate 0.7 parts; 0.18 parts of hydroxyethyl cellulose; 38 portions of water.

[0033] Preparation method of fire-retardant and heat-insulating coating: Step 1: Weigh out the raw materials in portions of each weight; Step 2: Turn on the mixer and adjust the mixer speed to 300~500r / min. Add the weighed dry powder materials, namely 35 parts of silicate cement, 28 parts of expanded vermiculite, 16 parts of expanded perlite, 7 parts of calcium carbonate, 13 parts of magnesium hydroxide, 7 parts of aluminum hydroxide, and 3 parts of talc powder, into the mixer in sequence and mix for 5~10 minutes. Step 3: Increase the mixer speed to 800~1000 r / min and continue mixing for 15-20 minutes to accelerate the mixing of dry powder materials in the mixer; Step 4: Reduce the speed of the mixer to 300~500r / min, slowly and evenly sprinkle 3.5 parts of the weighed aluminum silicate fiber into the dry powder mixture being mixed, and continue mixing for 5~10 minutes. Step 5: Increase the mixer speed to 800~1800 r / min and continue mixing for 15-20 minutes to accelerate the mixing of aluminum silicate fiber and dry powder material in the mixer; Step 6: Add 0.7 parts of weighed sodium hexametaphosphate and 0.18 parts of hydroxyethyl cellulose to the mixer and continue mixing for 10-15 minutes. Step 7: Reduce the speed of the mixer to 300-500 r / min, and slowly add 38 parts of the weighed water into the mixer and mix for 4-8 minutes. Step 8: Add 13 parts of the weighed VAE, increase the speed of the mixer to 700~900 r / min, and continue stirring for 10~20 minutes to obtain the fireproof and heat-insulating coating.

[0034] Application of fire-retardant and heat-insulating coatings in fire-resistant and heat-insulating steel column cladding systems: The fire-resistant and heat-insulating steel column cladding system includes an I40b I-beam column, aluminum silicate cotton filling the cavity and outer surface of the I40b I-beam column, a heat insulation board covering the periphery of the I40b I-beam column and located outside the aluminum silicate cotton, and a perlite fireproof board covering the heat insulation board; the heat insulation board is made by air drying and pressing the fireproof and heat-insulating coating.

[0035] Two L-shaped keels and several connecting steel strips are distributed opposite each other on the outer perimeter of the insulation board. The L-shaped keels and connecting steel strips are adjacent to each other and located between the insulation board and the foamed fireproof board. Self-tapping screws connect the L-shaped keels, connecting steel strips and foamed fireproof board. The thickness of the L-shaped keels is 0.8mm, and the specifications of the connecting steel strips are 0.8*30mm.

[0036] The insulation board is 30mm thick, and the beaded fireproof board is 40mm thick. Example

[0037] This embodiment 4 provides a fireproof and heat-insulating coating for steel structures, its preparation method, and its application, as detailed below: Fireproof and heat-insulating coatings: 37 parts of silicate cement; 28 parts of expanded vermiculite; 17 portions of expanded perlite; 8 parts calcium carbonate; 13 parts magnesium hydroxide; 8 parts aluminum hydroxide; VAE 12 copies; 4 parts talcum powder; 3 parts aluminum silicate fiber; Sodium hexametaphosphate 0.9 parts; 0.1 parts of hydroxyethyl cellulose; 37 portions of water.

[0038] Preparation method of fire-retardant and heat-insulating coating: Step 1: Weigh out the raw materials in portions of each weight; Step 2: Turn on the mixer and adjust the mixer speed to 300~500r / min. Add the weighed dry powder materials, namely 37 parts of silicate cement, 28 parts of expanded vermiculite, 17 parts of expanded perlite, 8 parts of calcium carbonate, 13 parts of magnesium hydroxide, 8 parts of aluminum hydroxide, and 8 parts of talc powder, into the mixer in sequence and mix for 5~10 minutes. Step 3: Increase the mixer speed to 800~1000 r / min and continue mixing for 15-20 minutes to accelerate the mixing of dry powder materials in the mixer; Step 4: Reduce the speed of the mixer to 300~500r / min, slowly and evenly sprinkle 3 portions of the weighed aluminum silicate fiber into the dry powder mixture being stirred, and continue stirring for 5~10 minutes. Step 5: Increase the mixer speed to 800~1800 r / min and continue mixing for 15-20 minutes to accelerate the mixing of aluminum silicate fiber and dry powder material in the mixer; Step 6: Add 0.9 parts of weighed sodium hexametaphosphate and 0.1 parts of hydroxyethyl cellulose to the mixer and continue mixing for 10-15 minutes. Step 7: Reduce the speed of the mixer to 300~500 r / min, and slowly add 37 parts of the weighed water into the mixer and mix for 4~8 minutes; Step 8: Add 12 parts of the weighed VAE, increase the speed of the mixer to 700~900 r / min, and continue mixing for 10~20 minutes to obtain the fireproof and heat-insulating coating.

[0039] Application of fire-retardant and heat-insulating coatings in fire-resistant and heat-insulating steel column cladding systems: The fire-resistant and heat-insulating steel column cladding system includes an I40b I-beam column, aluminum silicate cotton filling the cavity and outer surface of the I40b I-beam column, a heat insulation board covering the periphery of the I40b I-beam column and located outside the aluminum silicate cotton, and a perlite fireproof board covering the heat insulation board; the heat insulation board is made by air drying and pressing the fireproof and heat-insulating coating.

[0040] Two L-shaped keels and several connecting steel strips are distributed opposite each other on the outer perimeter of the insulation board. The L-shaped keels and connecting steel strips are adjacent to each other and located between the insulation board and the foamed fireproof board. Self-tapping screws connect the L-shaped keels, connecting steel strips and foamed fireproof board. The thickness of the L-shaped keels is 0.8mm, and the specifications of the connecting steel strips are 0.8*30mm.

[0041] The insulation board is 30mm thick, and the beaded fireproof board is 40mm thick. Example

[0042] This embodiment 5 provides a fireproof and heat-insulating coating for steel structures, its preparation method, and its application, as detailed below: Fireproof and heat-insulating coatings: 40 parts of silicate cement; 30 parts of expanded vermiculite; 15 parts expanded perlite; 9 parts calcium carbonate; 15 parts magnesium hydroxide; 6 parts aluminum hydroxide; VAE 10 copies; 5 parts talcum powder; 4 parts of aluminum silicate fiber; Sodium hexametaphosphate 0.8 parts; 0.19 parts of hydroxyethyl cellulose; 45 parts water.

[0043] Preparation method of fire-retardant and heat-insulating coating: Step 1: Weigh out the raw materials in portions of each weight; Step 2: Turn on the mixer and adjust the mixer speed to 300~500r / min. Add the weighed dry powder materials, namely 40 parts of silicate cement, 30 parts of expanded vermiculite, 15 parts of expanded perlite, 9 parts of calcium carbonate, 15 parts of magnesium hydroxide, 6 parts of aluminum hydroxide, and 5 parts of talc powder, into the mixer in sequence and mix for 5~10 minutes. Step 3: Increase the mixer speed to 800~1000 r / min and continue mixing for 15-20 minutes to accelerate the mixing of dry powder materials in the mixer; Step 4: Reduce the speed of the mixer to 300~500r / min, slowly and evenly sprinkle 4 portions of the weighed aluminum silicate fiber into the dry powder mixture being stirred, and continue stirring for 5~10 minutes. Step 5: Increase the mixer speed to 800~1800 r / min and continue mixing for 15-20 minutes to accelerate the mixing of aluminum silicate fiber and dry powder material in the mixer; Step 6: Add 0.8 parts of weighed sodium hexametaphosphate and 0.19 parts of hydroxyethyl cellulose to the mixer and continue mixing for 10-15 minutes. Step 7: Reduce the speed of the mixer to 300-500 r / min, and slowly add 45 parts of the weighed water into the mixer and mix for 4-8 minutes. Step 8: Add 10 parts of the weighed VAE, increase the speed of the mixer to 700~900 r / min, and continue stirring for 10~20 minutes to obtain the fireproof and heat-insulating coating.

[0044] Application of fire-retardant and heat-insulating coatings in fire-resistant and heat-insulating steel column cladding systems: The fire-resistant and heat-insulating steel column cladding system includes an I40b I-beam column, aluminum silicate cotton filling the cavity and outer surface of the I40b I-beam column, a heat insulation board covering the periphery of the I40b I-beam column and located outside the aluminum silicate cotton, and a perlite fireproof board covering the heat insulation board; the heat insulation board is made by air drying and pressing the fireproof and heat-insulating coating.

[0045] Two L-shaped keels and several connecting steel strips are distributed opposite each other on the outer perimeter of the insulation board. The L-shaped keels and connecting steel strips are adjacent to each other and located between the insulation board and the foamed fireproof board. Self-tapping screws connect the L-shaped keels, connecting steel strips and foamed fireproof board. The thickness of the L-shaped keels is 0.8mm, and the specifications of the connecting steel strips are 0.8*30mm.

[0046] The insulation board is 30mm thick, and the beaded fireproof board is 40mm thick. Example

[0047] This embodiment 6 provides a fireproof and heat-insulating coating for steel structures, its preparation method, and its application, as detailed below: Fireproof and heat-insulating coatings: 38 parts of silicate cement; 25 parts of expanded vermiculite; 18 portions of expanded perlite; 10 parts calcium carbonate; 12 parts magnesium hydroxide; 7 parts aluminum hydroxide; VAE 11 copies; 4 parts talcum powder; 4.5 parts of aluminum silicate fiber; Sodium hexametaphosphate 0.8 parts; 0.1 parts of hydroxyethyl cellulose; 40 parts water.

[0048] Preparation method of fire-retardant and heat-insulating coating: Step 1: Weigh out the raw materials in portions of each weight; Step 2: Turn on the mixer and adjust the mixer speed to 300~500r / min. Add the weighed dry powder materials, namely 38 parts of silicate cement, 25 parts of expanded vermiculite, 18 parts of expanded perlite, 10 parts of calcium carbonate, 12 parts of magnesium hydroxide, 7 parts of aluminum hydroxide, and 4 parts of talc powder, into the mixer in sequence and mix for 5~10 minutes. Step 3: Increase the mixer speed to 800~1000 r / min and continue mixing for 15-20 minutes to accelerate the mixing of dry powder materials in the mixer; Step 4: Reduce the speed of the mixer to 300~500r / min, slowly and evenly sprinkle 4.5 parts of the weighed aluminum silicate fiber into the dry powder mixture being mixed, and continue mixing for 5~10 minutes. Step 5: Increase the mixer speed to 800~1800 r / min and continue mixing for 15-20 minutes to accelerate the mixing of aluminum silicate fiber and dry powder material in the mixer; Step 6: Add 0.8 parts of weighed sodium hexametaphosphate and 0.1 parts of hydroxyethyl cellulose to the mixer and continue mixing for 10-15 minutes; Step 7: Reduce the speed of the mixer to 300~500 r / min, and slowly add 40 parts of the weighed water into the mixer and mix for 4~8 minutes; Step 8: Add 11 parts of VAE weighed out, increase the speed of the mixer to 700~900 r / min, and continue mixing for 10~20 minutes to obtain the fireproof and heat-insulating coating.

[0049] Application of fire-retardant and heat-insulating coatings in fire-resistant and heat-insulating steel column cladding systems: The fire-resistant and heat-insulating steel column cladding system includes an I40b I-beam column, aluminum silicate cotton filling the cavity and outer surface of the I40b I-beam column, a heat insulation board covering the periphery of the I40b I-beam column and located outside the aluminum silicate cotton, and a perlite fireproof board covering the heat insulation board; the heat insulation board is made by air drying and pressing the fireproof and heat-insulating coating.

[0050] Two L-shaped keels and several connecting steel strips are distributed opposite each other on the outer perimeter of the insulation board. The L-shaped keels and connecting steel strips are adjacent to each other and located between the insulation board and the foamed fireproof board. Self-tapping screws connect the L-shaped keels, connecting steel strips and foamed fireproof board. The thickness of the L-shaped keels is 0.8mm, and the specifications of the connecting steel strips are 0.8*30mm.

[0051] The insulation board is 30mm thick, and the beaded fireproof board is 40mm thick. Example

[0052] This embodiment 7 provides a fireproof and heat-insulating coating for steel structures, its preparation method, and its application, as detailed below: Fireproof and heat-insulating coatings: 39 parts of silicate cement; 29 parts of expanded vermiculite; 20 parts expanded perlite; 9 parts calcium carbonate; 13 parts magnesium hydroxide; 8 parts aluminum hydroxide; VAE 12 copies; 3 parts talcum powder; 5 parts of aluminum silicate fiber; 1 part sodium hexametaphosphate; 0.16 parts of hydroxyethyl cellulose; 42 parts water.

[0053] Preparation method of fire-retardant and heat-insulating coating: Step 1: Weigh out the raw materials in portions of each weight; Step 2: Turn on the mixer and adjust the mixer speed to 300~500r / min. Add the weighed dry powder materials, namely 39 parts of silicate cement, 29 parts of expanded vermiculite, 20 parts of expanded perlite, 9 parts of calcium carbonate, 13 parts of magnesium hydroxide, 8 parts of aluminum hydroxide, and 3 parts of talc powder, into the mixer in sequence and mix for 5~10 minutes. Step 3: Increase the mixer speed to 800~1000 r / min and continue mixing for 15-20 minutes to accelerate the mixing of dry powder materials in the mixer; Step 4: Reduce the speed of the mixer to 300~500r / min, slowly and evenly sprinkle 5 portions of the weighed aluminum silicate fiber into the dry powder mixture being mixed, and continue mixing for 5~10 minutes. Step 5: Increase the mixer speed to 800~1800 r / min and continue mixing for 15-20 minutes to accelerate the mixing of aluminum silicate fiber and dry powder material in the mixer; Step 6: Add 1 part of weighed sodium hexametaphosphate and 0.16 parts of hydroxyethyl cellulose to the mixer and continue mixing for 10-15 minutes. Step 7: Reduce the speed of the mixer to 300~500 r / min, and slowly add 42 parts of the weighed water into the mixer and mix for 4~8 minutes; Step 8: Add 12 parts of the weighed VAE, increase the speed of the mixer to 700~900 r / min, and continue mixing for 10~20 minutes to obtain the fireproof and heat-insulating coating.

[0054] Application of fire-retardant and heat-insulating coatings in fire-resistant and heat-insulating steel column cladding systems: The fire-resistant and heat-insulating steel column cladding system includes an I40b I-beam column, aluminum silicate cotton filling the cavity and outer surface of the I40b I-beam column, a heat insulation board covering the periphery of the I40b I-beam column and located outside the aluminum silicate cotton, and a perlite fireproof board covering the heat insulation board; the heat insulation board is made by air drying and pressing the fireproof and heat-insulating coating.

[0055] Two L-shaped keels and several connecting steel strips are distributed opposite each other on the outer perimeter of the insulation board. The L-shaped keels and connecting steel strips are adjacent to each other and located between the insulation board and the foamed fireproof board. Self-tapping screws connect the L-shaped keels, connecting steel strips and foamed fireproof board. The thickness of the L-shaped keels is 0.8mm, and the specifications of the connecting steel strips are 0.8*30mm.

[0056] The insulation board is 30mm thick, and the beaded fireproof board is 40mm thick.

[0057] Experimental Example 1.

[0058] This test example provides a fire resistance performance test of a fire-resistant and heat-insulating steel column cladding system using the fire-resistant and heat-insulating coating of the present invention.

[0059] The fire resistance test method is as follows: connect thermocouples to I40b I-beam columns (the distribution of thermocouples on the I40b I-beam columns is as follows). Figure 2-3 As shown in the figure (circles represent thermocouples), a test specimen was made according to the structure of the refractory and heat-insulating steel column cladding system. During the specimen making process, the output end of the thermocouple was led out of the specimen, and the two end faces of the specimen were covered with concrete. Then the specimen was placed in the test furnace. The thermocouple lead-out end was connected in parallel to the input end of the matching display instrument, recording instrument and electronic regulator through a three-way connector. The output end of the electronic regulator was connected to the test furnace. Then the test furnace was turned on to burn the specimen for 4.00 hours. During the combustion process, the temperature of the I40b I-beam steel column was measured by the thermocouple. The combustion temperature of the test furnace was adjusted by the electronic regulator used with the thermocouple. The temperature of the I40b I-beam steel column was read by the display instrument used with the thermocouple. The temperature change of the I40b I-beam steel column was recorded by the recording instrument used with the thermocouple. After combustion, the temperature values ​​of the I40b I-beam columns were recorded, the highest temperature of the I40b I-beam columns was selected, and the average temperature of the I40b I-beam columns was calculated.

[0060] The specimen was 2.8 meters high, 308 mm wide, and 585 mm long. The insulation board on the specimen was 30 mm thick, the fireproof board was 40 mm thick, and the fireproof layer covering the specimen was 70 mm thick.

[0061] According to the technical requirements specified in XF / T 110-2013 General Requirements for Fire-Resistant Protective Materials for Building Components: the fire resistance performance of steel columns should be ≥2.00h, with a single-point temperature ≤649℃ and an average temperature ≤538℃. The fire resistance performance test results of the fire-resistant and heat-insulating steel column cladding system using the fire-resistant and heat-insulating coating of this invention are as follows: cladding material thickness: 70mm; after 4.00h, the average temperature of the specimen is 118℃, and the highest temperature is 125℃.

[0062] According to the fire resistance test results, the fire resistance performance of the fire-resistant and heat-insulating steel column cladding system using the fire-resistant and heat-insulating coating of this invention meets the technical requirements specified in XF / T 110-2013 General Requirements for Fire-resistant Protective Materials for Building Components. Furthermore, it can be seen that the fire-resistant and heat-insulating coating of this invention provides good fire protection for steel structures. Based on the existing method of protecting steel structures by combining aluminum silicate cotton and perlite fireproof boards, this invention improves upon this method by replacing a portion of the aluminum silicate cotton with the fire-resistant and heat-insulating coating of this invention, thus significantly slowing down the temperature rise of the steel columns and improving the fire resistance of the steel structure.

[0063] Finally, it should be noted that the above embodiments are merely preferred embodiments of the present invention used to illustrate the technical solutions of the present invention, and are not intended to limit the invention, nor are they intended to limit the patent scope of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. That is to say, any changes or refinements made to the main design concept and spirit of the present invention that are not of substantial significance, but whose technical problems are still consistent with the present invention, should be included within the protection scope of the present invention. In addition, the direct or indirect application of the technical solutions of the present invention to other related technical fields are similarly included within the patent protection scope of the present invention.

Claims

1. A fireproof and heat-insulating coating for steel structures, characterized in that, It is made from the following raw materials in parts by weight: 30-40 parts silicate cement, 25-30 parts expanded vermiculite, 15-20 parts expanded perlite, 5-10 parts calcium carbonate, 10-15 parts magnesium hydroxide, 5-10 parts aluminum hydroxide, 10-15 parts VAE, 2-5 parts talc, 2-5 parts reinforcing fiber, 0.5-1 part dispersant, 0.1-0.2 parts hydroxyethyl cellulose, and 30-50 parts water.

2. The fireproof and heat-insulating coating for steel structures according to claim 1, characterized in that, The dispersant is sodium hexametaphosphate.

3. The fireproof and heat-insulating coating for steel structures according to claim 1, characterized in that, The reinforcing fiber is any one or more of glass fiber, aluminosilicate fiber, and ceramic fiber.

4. The fireproof and heat-insulating coating for steel structures according to claim 3, characterized in that, The reinforcing fiber is aluminum silicate fiber.

5. A method for preparing a fireproof and heat-insulating coating for steel structures according to any one of claims 1-4, characterized in that, Includes the following steps: Step 1: Weigh out the raw materials in portions of each weight; Step 2: Turn on the mixer and adjust the mixer speed to 300~500r / min. Add the weighed dry powder materials, namely silicate cement, expanded vermiculite, expanded perlite, calcium carbonate, magnesium hydroxide, aluminum hydroxide and talc powder, into the mixer in sequence and mix for 5~10min. Step 3: Increase the mixer speed to 800~1000 r / min and continue mixing for 15-20 minutes to accelerate the mixing of dry powder materials in the mixer; Step 4: Reduce the mixer speed to 300~500r / min, slowly and evenly sprinkle the weighed aluminum silicate fiber into the dry powder mixture being stirred, and continue stirring for 5~10min; Step 5: Increase the mixer speed to 800~1800 r / min and continue mixing for 15-20 minutes to accelerate the mixing of aluminum silicate fiber and dry powder material in the mixer; Step 6: Add the weighed sodium hexametaphosphate and hydroxyethyl cellulose to the mixer and continue mixing for 10-15 minutes; Step 7: Reduce the speed of the mixer to 300~500 r / min, and slowly add the weighed water into the mixer and mix for 4~8 minutes; Step 8: Add the weighed VAE, increase the mixer speed to 700~900 r / min, and continue stirring for 10~20 minutes to obtain the fireproof and heat-insulating coating.

6. The application of a fire-resistant and heat-insulating coating for steel structures according to any one of claims 1-4 in a fire-resistant and heat-insulating steel column cladding system, characterized in that, The fire-resistant and heat-insulating steel column cladding system includes an I40b I-beam column, aluminum silicate cotton filling the cavity and outer surface of the I40b I-beam column, a heat insulation board covering the periphery of the I40b I-beam column and located outside the aluminum silicate cotton, and a perlite fireproof board covering the heat insulation board; the heat insulation board is made by air drying and pressing the fireproof and heat-insulating coating.

7. The application of the fireproof and heat-insulating coating for steel structures according to claim 6 in a fire-resistant and heat-insulating steel column cladding system, characterized in that, Two L-shaped keels and several connecting steel strips are distributed opposite each other on the outer periphery of the heat insulation board. The L-shaped keels and connecting steel strips are adjacent to each other and located between the heat insulation board and the floating fireproof board. Self-tapping screws are used to connect the L-shaped keels, connecting steel strips and floating fireproof board.

8. The application of the fireproof and heat-insulating coating for steel structures according to claim 6 in a fire-resistant and heat-insulating steel column cladding system, characterized in that, The insulation board is 30mm thick, and the beaded fireproof board is 40mm thick.

9. The application of the fireproof and heat-insulating coating for steel structures according to claim 6 in a fire-resistant and heat-insulating steel column cladding system, characterized in that, The fire resistance and heat insulation test method for the fire-resistant and heat-insulating steel column cladding system is as follows: A thermocouple is connected to an I40b I-beam column. A specimen is fabricated according to the structure of the fire-resistant and heat-insulating steel column cladding system. During specimen fabrication, the thermocouple output is led out of the specimen. Concrete is used to cover both ends of the specimen. The specimen is then placed in a test furnace. The thermocouple output is connected in parallel to the input of the matching display instrument, recording instrument, and electronic regulator via a three-way connector. The output of the electronic regulator is connected to the test furnace. The test furnace is then turned on to burn the specimen for 4.00 hours. During combustion, the temperature of the I40b I-beam column is measured using the thermocouple. The combustion temperature of the test furnace is adjusted using the electronic regulator used with the thermocouple. The temperature of the I40b I-beam column is read using the display instrument used with the thermocouple. The temperature change of the I40b I-beam column is recorded using the recording instrument used with the thermocouple. After combustion, the temperature values ​​of the I40b I-beam columns were recorded, the highest temperature of the I40b I-beam columns was selected, and the average temperature of the I40b I-beam columns was calculated.

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