CN110590303A - Fireproof coating for tunnel - Google Patents
Fireproof coating for tunnel Download PDFInfo
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- CN110590303A CN110590303A CN201910968784.XA CN201910968784A CN110590303A CN 110590303 A CN110590303 A CN 110590303A CN 201910968784 A CN201910968784 A CN 201910968784A CN 110590303 A CN110590303 A CN 110590303A
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- tunnel
- cement
- fireproof coating
- coating
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
- C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Ceramic Products (AREA)
Abstract
The invention discloses a fireproof coating for a tunnel, which comprises the following raw materials in parts by weight: 5-70g of high-alumina cement, 5-70g of ordinary cement, 1-10g of redispersible rubber powder, 9-32g of expanded perlite, 7-33g of expanded vermiculite, 5-15g of hollow microspheres, 15-35g of light calcium carbonate, 2-12g of bentonite, 2-9g of sepiolite, 1-10g of aluminum silicate fiber, 4-25g of flame-retardant smoke suppressant, 2-15g of aluminum hydroxide, 3-10g of magnesium hydroxide and 2-10g of sodium tetraborate. The invention delays the heating speed of the reinforcing steel bar, improves the fire resistance, enhances the fire-proof limit, strengthens the bonding strength between the coating and the inner wall of the tunnel, effectively carries out fire-proof treatment in the tunnel, reduces the loss caused by external fire and reduces the repairing cost by depending on the incombustibility and low heat conductivity of the material and the heat absorptivity of the material in the coating.
Description
Technical Field
The invention relates to the technical field of fireproof coatings for tunnels, in particular to a fireproof coating for a tunnel.
Background
An underground artificially constructed tunnel having a cross-sectional area exceeding 30 square meters is defined in architecture as a tunnel. The tunnel not only undertakes the task of transportation, but also plays the function of optical cables, electric cables, even oil pipelines and water conveying pipelines. Although the reinforced concrete member used as the main building in the tunnel is a non-combustible material, the tunnel fire has the characteristics of rapid rise of the surrounding temperature after combustion, long duration, large ignition range, difficult fire fighting and rescue and difficult entry and the like. In the short time that the conflagration takes place, the local temperature at the scene of catching fire in the tunnel can rise to 1000 ℃ rapidly, along with the continuation rising of temperature, combines water to become steam inflation in the concrete, produces pressure, leads to the concrete top layer to take place to explode and split, produces big collapse, and tunnel lining and structure also receive destruction, have aggravated evacuation and rescue personnel's life danger, and its direct loss and indirect loss are huge, and the tunnel can be divided into traffic tunnel, hydraulic tunnel, municipal tunnel, mine tunnel.
The tunnel fireproof coating is gradually researched and produced from the end of 90 years in the 20 th century, and mainly comprises a binder, an inorganic heat-insulating filler, a foaming material, an auxiliary agent and the like. The fireproof protection principle is that the self fireproof and non-combustible material forms a glaze film closed base material at high temperature to isolate air, separate flame and heat, thereby achieving the purpose of fireproof and flame-retardant. Therefore, the tunnel fireproof coating is one of effective protective measures for improving the fire resistance limit of the tunnel and preventing the steel components from deformation and collapse caused by rapid temperature rise in a fire, and the simple and feasible prevention method is to spray the tunnel special fireproof coating.
In the prior art, many researches are made on a fireproof coating for a tunnel, and patent number CN106630872A discloses a special fireproof coating for a tunnel, wherein epoxy-terminated polyetheramine and polybenzimidazole are added, the epoxy-terminated polyetheramine contains a large amount of hydroxyl groups, so that the adhesion between the coating and a substrate can be greatly improved, the aging resistance of the coating is improved, the compatibility between the coating and a system can be greatly improved through sulfonation and beta-cyclodextrin modification, the crosslinking density of the system can be greatly improved, and the adhesion and the strength are improved.
Patent No. CN108640567A discloses an environmental protection fire-proof coating for tunnel, which is fire-resistant, corrosion-resistant and stable, safe and nontoxic, short in curing time, convenient for construction, and high in efficiency, but the research personnel find that the bonding strength of the coating is low, so that the coating and the inner wall of the tunnel can not be effectively attached, and the coating can easily fall off after long-time use.
In summary, how to improve the bonding strength of the fireproof coating, how to ensure the effective adhesion between the fireproof coating and the inner wall of the tunnel, and how to enhance the fireproof limit of the fireproof coating is the key point of research by the technical personnel in the field, and therefore, a fireproof coating for the tunnel is provided to solve the problems.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a fireproof coating for a tunnel.
In order to achieve the purpose, the invention adopts the following technical scheme:
the fireproof coating for the tunnel comprises the following raw materials in parts by weight: 5-70g of high-alumina cement, 5-70g of ordinary cement, 1-10g of redispersible rubber powder, 9-32g of expanded perlite, 7-33g of expanded vermiculite, 5-15g of hollow microspheres, 15-35g of light calcium carbonate, 2-12g of bentonite, 2-9g of sepiolite, 1-10g of aluminum silicate fiber, 4-25g of flame-retardant smoke suppressant, 2-15g of aluminum hydroxide, 3-10g of magnesium hydroxide and 2-10g of sodium tetraborate.
Preferably, 10-60g of high-alumina cement, 10-65g of ordinary cement, 2-9g of redispersible rubber powder, 10-30g of expanded perlite, 8-28g of expanded vermiculite, 6-12g of hollow microspheres, 18-30g of light calcium carbonate, 3-10g of bentonite, 3-8g of sepiolite, 2-9g of aluminum silicate fibers, 5-20g of flame-retardant smoke suppressant, 3-12g of aluminum hydroxide, 4-9g of magnesium hydroxide and 3-9g of sodium tetraborate.
Preferably, 30g of high-alumina cement, 40g of ordinary cement, 5g of redispersible rubber powder, 20g of expanded perlite, 18g of expanded vermiculite, 8g of cenospheres, 24g of light calcium carbonate, 6g of bentonite, 5g of sepiolite, 5g of aluminum silicate fiber, 12g of flame retardant and smoke suppressant, 8g of aluminum hydroxide, 6g of magnesium hydroxide and 7g of sodium tetraborate.
Preferably, the weight ratio of the high-alumina cement to the ordinary cement is 10-60: 10-65.
Preferably, the weight ratio of the aluminum hydroxide to the magnesium hydroxide to the sodium tetraborate is 3-12: 4-9: 3-9.
Preferably, the weight ratio of the expanded perlite to the expanded vermiculite to the bentonite to the sepiolite is 10-30: 8-28: 3-10: 3-8.
Preferably, the flame retardant and smoke suppressant is a molybdate.
In the invention, raw materials such as expanded perlite, expanded vermiculite, hollow microspheres, bentonite and sepiolite are screened to remove coarse particles so as to avoid blockage of pipelines and spray guns by the coarse particles during spraying construction, an auxiliary agent is added into the raw materials such as the expanded perlite, the expanded vermiculite, the hollow microspheres, the bentonite and the sepiolite, the raw materials are fully stirred and uniformly mixed in a high-speed stirrer to form a mixed material, a binder is added into the mixed material, the mixed material is fully stirred and uniformly mixed, and then water, high-alumina cement, ordinary cement, redispersible rubber powder, light calcium carbonate, aluminum silicate fiber, a flame retardant smoke suppressant, aluminum hydroxide, magnesium hydroxide, sodium tetraborate, the mixed material and other auxiliary agents are mixed according to the proportion of (0.70-0.75): 1, stirring for 20 minutes by a stirrer to form thick paste, wherein the ordinary silicon cement has the characteristics of high bonding strength, good frost resistance, stable strength development, dry shrinkage, large hydration heat, low cost and the like, compared with the ordinary silicon cement, the high-alumina cement mainly has a fast-hardening, high-strength and fireproof characteristic net, a small amount of slurry is used as a cross-strip thickness mark with the interval of 2.5 meters and used as a reference object for spraying construction, then a spraying machine is used for spraying from the waist part to the top part of a tunnel, the spraying thickness is 3-8 millimeters each time, after the primary spraying is basically dried, the spraying is continued for the second time, the circulation is carried out until the spraying is carried out to the designed thickness, after the final spraying, the slurry is immediately used for manual filling and finishing, the surface of the coating is flat, smooth and clean, the basic surface layer is constructed by using machines such as a spray gun, a wool brush, a roller and the like to form a surface layer, when the coating is sprayed on the surfaces of the concrete at the vault and the side wall in the tunnel and a fire occurs, because inorganic additives such as boride, aluminum oxide and the like are added into the coating, once the aluminum oxide reaches the decomposition temperature of the aluminum oxide in the fire, aluminum hydroxide absorbs part of combustion heat in the dehydration process to reduce the temperature of a system, then the dehydrated water is changed into water vapor at the combustion temperature to absorb heat, a large amount of water vapor can also inhibit the generation of smoke, and in addition, AD203 generated by reaction is an inorganic refractory material and has good fireproof and heat-insulating effects with other carbide formed by combustion, so that the coating effectively blocks flame and heat, the heat reduces the transmission speed of the heat to the concrete and the steel bars inside the concrete lining so as to delay the heating speed of the concrete and protect the tunnel from fire, the invention depends on the incombustibility, low heat conductivity and the heat absorption of the material in the coating, the speed that the reinforcing bar rises to heat has been delayed, has improved fire resistance, has strengthened the fire prevention limit, has strengthened the adhesive strength between coating and the tunnel inner wall, and effectual fire prevention treatment is carried out in to the tunnel, has reduced the loss and the reduction prosthetic cost that outside conflagration brought.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Example 1
The fireproof coating for the tunnel comprises the following raw materials in parts by weight: 10g of high-alumina cement, 10g of ordinary cement, 2g of redispersible rubber powder, 15g of expanded perlite, 10g of expanded vermiculite, 10g of hollow microspheres, 18g of light calcium carbonate, 2g of bentonite, 3g of sepiolite, 3g of aluminum silicate fibers, 8g of flame-retardant smoke suppressant, 4g of aluminum hydroxide, 5g of magnesium hydroxide and 4g of sodium tetraborate.
In the present invention, the main characteristics of the high alumina cement are high early strength, high temperature and corrosion resistance. The high-alumina cement is mainly used for urgent projects of construction period, such as pressure protection projects, roads, special rush-repair projects and the like, and can also be used for projects of winter construction, the ordinary silica cement has the characteristics of high strength, large hydration heat, good frost resistance, small dry shrinkage, good wear resistance, good carbonization resistance, poor corrosion resistance and no high temperature resistance, and the bonding strength of the fireproof coating and the inner wall of the tunnel is enhanced by combining the high-alumina cement and the ordinary silica cement.
Example 2
The fireproof coating for the tunnel comprises 20g of high-alumina cement, 20g of ordinary cement, 5g of redispersible rubber powder, 16g of expanded perlite, 18g of expanded vermiculite, 8g of hollow microspheres, 24g of light calcium carbonate, 4g of bentonite, 5g of sepiolite, 5g of aluminum silicate fibers, 12g of flame-retardant smoke suppressant, 8g of aluminum hydroxide, 6g of magnesium hydroxide and 5g of sodium tetraborate.
In the present invention, the main characteristics of the high alumina cement are high early strength, high temperature and corrosion resistance. The high-alumina cement is mainly used for urgent projects of construction period, such as pressure protection projects, roads, special rush-repair projects and the like, and can also be used for projects of winter construction, the ordinary silica cement has the characteristics of high strength, large hydration heat, good frost resistance, small dry shrinkage, good wear resistance, good carbonization resistance, poor corrosion resistance and no high temperature resistance, and the bonding strength of the fireproof coating and the inner wall of the tunnel is enhanced by combining the high-alumina cement and the ordinary silica cement.
Example 3
The fireproof coating for the tunnel comprises 30g of high-alumina cement, 30g of ordinary cement, 6g of redispersible rubber powder, 20g of expanded perlite, 20g of expanded vermiculite, 12g of hollow microspheres, 28g of light calcium carbonate, 6g of bentonite, 6g of sepiolite, 7g of aluminum silicate fibers, 18g of flame-retardant smoke suppressant, 10g of aluminum hydroxide, 7g of magnesium hydroxide and 6g of sodium tetraborate.
In the present invention, the main characteristics of the high alumina cement are high early strength, high temperature and corrosion resistance. The high-alumina cement is mainly used for urgent projects of construction period, such as pressure protection projects, roads, special rush-repair projects and the like, and can also be used for projects of winter construction, the ordinary silica cement has the characteristics of high strength, large hydration heat, good frost resistance, small dry shrinkage, good wear resistance, good carbonization resistance, poor corrosion resistance and no high temperature resistance, and the bonding strength of the fireproof coating and the inner wall of the tunnel is enhanced by combining the high-alumina cement and the ordinary silica cement.
Example 4
The flame-retardant smoke-inhibiting agent comprises 40g of high-alumina cement, 40g of ordinary cement, 7g of redispersible rubber powder, 25g of expanded perlite, 25g of expanded vermiculite, 13g of hollow microspheres, 30g of light calcium carbonate, 7g of bentonite, 7g of sepiolite, 8g of aluminum silicate fibers, 20g of flame-retardant smoke-inhibiting agent, 12g of aluminum hydroxide, 8g of magnesium hydroxide and 7g of sodium tetraborate.
In the present invention, the main characteristics of the high alumina cement are high early strength, high temperature and corrosion resistance. The high-alumina cement is mainly used for urgent projects of construction period, such as pressure protection projects, roads, special rush-repair projects and the like, and can also be used for projects of winter construction, the ordinary silica cement has the characteristics of high strength, large hydration heat, good frost resistance, small dry shrinkage, good wear resistance, good carbonization resistance, poor corrosion resistance and no high temperature resistance, and the bonding strength of the fireproof coating and the inner wall of the tunnel is enhanced by combining the high-alumina cement and the ordinary silica cement.
Example 5
The flame-retardant smoke-inhibiting agent comprises 50g of high-alumina cement, 50g of ordinary cement, 7g of redispersible rubber powder, 30g of expanded perlite, 30g of expanded vermiculite, 14g of hollow microspheres, 32g of light calcium carbonate, 10g of bentonite, 8g of sepiolite, 9g of aluminum silicate fibers, 23g of flame-retardant smoke-inhibiting agent, 13g of aluminum hydroxide, 8g of magnesium hydroxide and 9g of sodium tetraborate.
In the present invention, the main characteristics of the high alumina cement are high early strength, high temperature and corrosion resistance. The high-alumina cement is mainly used for urgent projects of construction period, such as pressure protection projects, roads, special rush-repair projects and the like, and can also be used for projects of winter construction, the ordinary silica cement has the characteristics of high strength, large hydration heat, good frost resistance, small dry shrinkage, good wear resistance, good carbonization resistance, poor corrosion resistance and no high temperature resistance, and the bonding strength of the fireproof coating and the inner wall of the tunnel is enhanced by combining the high-alumina cement and the ordinary silica cement.
In the invention, raw materials such as expanded perlite, expanded vermiculite, hollow microspheres, bentonite and sepiolite are screened to remove coarse particles so as to avoid blockage of pipelines and spray guns by the coarse particles during spraying construction, an auxiliary agent is added into the raw materials such as the expanded perlite, the expanded vermiculite, the hollow microspheres, the bentonite and the sepiolite, the raw materials are fully stirred and uniformly mixed in a high-speed stirrer to form a mixed material, a binder is added into the mixed material, the mixed material is fully stirred and uniformly mixed, and then water, high-alumina cement, ordinary cement, redispersible rubber powder, light calcium carbonate, aluminum silicate fiber, a flame retardant smoke suppressant, aluminum hydroxide, magnesium hydroxide, sodium tetraborate, the mixed material and other auxiliary agents are mixed according to the proportion of (0.70-0.75): 1, stirring for 20 minutes by a stirrer to form thick paste, wherein the ordinary silicon cement has the characteristics of high bonding strength, good frost resistance, stable strength development, dry shrinkage, large hydration heat, low cost and the like, compared with the ordinary silicon cement, the high-alumina cement mainly has a fast-hardening, high-strength and fireproof characteristic net, a small amount of slurry is used as a cross-strip thickness mark with the interval of 2.5 meters and used as a reference object for spraying construction, then a spraying machine is used for spraying from the waist part to the top part of a tunnel, the spraying thickness is 3-8 millimeters each time, after the primary spraying is basically dried, the spraying is continued for the second time, the circulation is carried out until the spraying is carried out to the designed thickness, after the final spraying, the slurry is immediately used for manual filling and finishing, the surface of the coating is flat, smooth and clean, the basic surface layer is constructed by using machines such as a spray gun, a wool brush, a roller and the like to form a surface layer, when the coating is sprayed on the surfaces of the concrete at the vault and the side wall in the tunnel and a fire hazard occurs, inorganic additives such as boride, aluminum oxide and the like are added into the coating, once the aluminum oxide reaches the decomposition temperature of the aluminum oxide in the fire hazard, part of combustion heat is absorbed in the dehydration process of aluminum hydroxide, the temperature of a system is reduced, then the dehydrated water is changed into water vapor at the combustion temperature and also absorbs heat, a large amount of water vapor can inhibit the generation of smoke, and in addition, AD203 generated by reaction is an inorganic refractory material and has good fireproof and heat-insulating effects with other carbide formed by combustion, so that the coating effectively blocks flame and heat, the heat reduces the transfer speed of the heat to the concrete and the steel bars in the liner of the concrete, the heating speed of the concrete is delayed, and the tunnel is protected from fire.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. The fireproof coating for the tunnel is characterized by comprising the following raw materials in parts by weight: 5-70g of high-alumina cement, 5-70g of ordinary cement, 1-10g of redispersible rubber powder, 9-32g of expanded perlite, 7-33g of expanded vermiculite, 5-15g of hollow microspheres, 15-35g of light calcium carbonate, 2-12g of bentonite, 2-9g of sepiolite, 1-10g of aluminum silicate fiber, 4-25g of flame-retardant smoke suppressant, 2-15g of aluminum hydroxide, 3-10g of magnesium hydroxide and 2-10g of sodium tetraborate.
2. The fireproof coating for tunnels according to claim 1, wherein: 10-60g of high-alumina cement, 10-65g of ordinary cement, 2-9g of redispersible rubber powder, 10-30g of expanded perlite, 8-28g of expanded vermiculite, 6-12g of hollow microspheres, 18-30g of light calcium carbonate, 3-10g of bentonite, 3-8g of sepiolite, 2-9g of aluminum silicate fiber, 5-20g of flame-retardant smoke inhibitor, 3-12g of aluminum hydroxide, 4-9g of magnesium hydroxide and 3-9g of sodium tetraborate.
3. The fireproof coating for tunnels according to claim 1, wherein: 30g of high-alumina cement, 40g of ordinary cement, 5g of redispersible rubber powder, 20g of expanded perlite, 18g of expanded vermiculite, 8g of hollow microspheres, 24g of light calcium carbonate, 6g of bentonite, 5g of sepiolite, 5g of aluminum silicate fibers, 12g of flame-retardant smoke suppressant, 8g of aluminum hydroxide, 6g of magnesium hydroxide and 7g of sodium tetraborate.
4. The fireproof coating for tunnels according to claim 2, wherein: the weight ratio of the high-alumina cement to the ordinary silica cement is 10-60: 10-65.
5. The fireproof coating for tunnels according to claim 2, wherein: the weight ratio of the aluminum hydroxide to the magnesium hydroxide to the sodium tetraborate is 3-12: 4-9: 3-9.
6. The fireproof coating for tunnels according to claim 2, wherein: the weight ratio of the expanded perlite to the expanded vermiculite to the bentonite to the sepiolite is 10-30: 8-28: 3-10: 3-8.
7. The fireproof coating for tunnels according to claim 1, wherein: the flame-retardant smoke suppressant is molybdate.
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| CN201910968784.XA CN110590303A (en) | 2019-10-12 | 2019-10-12 | Fireproof coating for tunnel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910968784.XA CN110590303A (en) | 2019-10-12 | 2019-10-12 | Fireproof coating for tunnel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111039631A (en) * | 2019-12-23 | 2020-04-21 | 应急管理部四川消防研究所 | Fireproof coating for concrete structure |
| CN116003029A (en) * | 2022-12-20 | 2023-04-25 | 福州大学 | Graphite-phase carbon nitride fireproof coating and application method thereof |
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| CN101407649A (en) * | 2008-04-16 | 2009-04-15 | 北京冶建新技术公司 | Adhesive complex tunnel fire-resisting paint |
| CN105198334A (en) * | 2015-10-28 | 2015-12-30 | 杨金伟 | Seepage-proof and fire-proof coating for tunnels |
| WO2016156761A1 (en) * | 2015-04-02 | 2016-10-06 | Lafarge | Insulating construction material comprising plant additives |
| CN108863230A (en) * | 2018-07-26 | 2018-11-23 | 安徽省安银金融机具设备有限公司 | A kind of fire-proof heat-insulating material and preparation method thereof |
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| CN101407649A (en) * | 2008-04-16 | 2009-04-15 | 北京冶建新技术公司 | Adhesive complex tunnel fire-resisting paint |
| WO2016156761A1 (en) * | 2015-04-02 | 2016-10-06 | Lafarge | Insulating construction material comprising plant additives |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111039631A (en) * | 2019-12-23 | 2020-04-21 | 应急管理部四川消防研究所 | Fireproof coating for concrete structure |
| CN116003029A (en) * | 2022-12-20 | 2023-04-25 | 福州大学 | Graphite-phase carbon nitride fireproof coating and application method thereof |
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