Non-intumescent fireproof coating for steel structure, its preparation method and application

Abstract

The application discloses a non-intumescent steel structure fireproof coating, a preparation method and application thereof, and belongs to the technical field of materials. The non-intumescent steel structure fireproof coating comprises an interface agent, fireproof and heat-insulating coating powder and a finishing material coating. The application further discloses application of the non-intumescent steel structure fireproof coating in preparation of a non-intumescent steel structure multi-layer protection system. The non-intumescent steel structure multi-layer protection system is prepared from the non-intumescent steel structure fireproof coating, and comprises an interface layer, a fireproof and heat-insulating coating layer and a finishing coating layer. The non-intumescent steel structure fireproof coating has good fireproof performance, aging resistance and comprehensive performance.

Description

Technical Field

[0001] This invention belongs to the field of materials technology, and relates to fireproof materials, particularly to a non-intumescent fireproof coating for steel structures, its preparation method and application. Background Technology

[0002] In the event of a fire in a high-rise / super high-rise building, the fire spreads rapidly vertically, contains a large amount of combustible material, poses significant challenges to external rescue, carries a high risk of smoke and toxic gases, and has limited primary rescue methods. High-rise / super high-rise buildings rely heavily on self-rescue. Therefore, improving the fire resistance rating of high-rise / super high-rise buildings is the primary issue in enhancing their fire safety.

[0003] Among existing high-rise fire protection products, fire-resistant boards and fire-retardant coatings are the most mature technologies, both capable of meeting the 3.00h-4.00h fire resistance rating requirements for walls or load-bearing structures in high-rise / super high-rise buildings. However, the overall cost of fire-resistant board measures is relatively high; in practical engineering applications, there are few cases where fire-resistant boards have achieved a fire resistance rating of 3.00h-4.00h. Compared to fire-resistant boards, fire-retardant coatings have the advantages of better deformability, allowing them to be modified according to the shape of the steel structure. The coating is also thinner, resulting in a lower weight per unit area for the same protective effect, thus placing lower load requirements on the building.

[0004] Fire-retardant coatings for steel structures are mainly divided into intumescent and non-intumescent types. For high-rise and super high-rise buildings with high fire resistance requirements, the two types of fire-retardant coatings are suitable for different applications based on their performance characteristics. Currently, in the fire protection design of high-rise and super high-rise steel structures (or buildings with a fire resistance rating exceeding 2.50 hours) in China, non-intumescent fire-retardant coatings are recommended, primarily for the fire protection of load-bearing components. Intumescent fire-retardant coatings are mainly used for the fire protection of components with a fire resistance rating of less than 2.00 hours.

[0005] Existing non-intumescent fire-retardant coatings all employ homogeneous fire-retardant structures with the same uniform composition. Improving the fire resistance of these coatings simply requires increasing the thickness of the fire-retardant layer. However, at high temperatures, changes in the crystal form or volume of the insulating, refractory, and binder components of the fire-retardant coating consequently affect its volume stability at high temperatures. Furthermore, the single-structure fire-retardant coatings of existing technologies cannot simultaneously achieve both fire resistance and insulation properties.

[0006] Therefore, providing a non-intumescent fireproof coating for steel structures, which has good aging resistance and comprehensive performance, can adapt to the fire protection characteristics of high-rise / super high-rise buildings, and can provide long-term fire protection for high-rise / super high-rise buildings, has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide a non-intumescent fire-retardant coating for steel structures and its preparation method, thereby solving the technical problem that existing non-intumescent fire-retardant coatings are all homogeneous fire-retardant structures with the same structure, which limits the aging resistance and overall performance of the fire-retardant coating.

[0008] Another object of the present invention is to provide the application of this non-intumescent steel structure fire retardant coating in the preparation of a non-intumescent steel structure multilayer protection system.

[0009] The technical solution adopted in this invention is as follows:

[0010] This invention discloses a non-intumescent fireproof coating for steel structures, comprising an interface agent, fireproof and heat-insulating coating powder, and finishing material coating.

[0011] In some embodiments of the present invention, the interface agent is made from raw materials comprising the following parts by weight: 90520-80 parts of flame retardant emulsion, 15-70 parts of solid mixture, 121-4 parts of alcohol ester, 11-44 parts of vitrified microspheres, 0.05-0.2 parts of hydroxyethyl cellulose, and 10-60 parts of water.

[0012] Preferably, the interface agent is made from the following raw materials in parts by weight: 90-550-60 parts of flame retardant emulsion, 25-45 parts of solid mixture, 121-3 parts of alcohol ester, 14-30 parts of vitrified microspheres, 0.08-0.12 parts of hydroxyethyl cellulose, and 10-45 parts of water.

[0013] In some embodiments of the present invention, the solid mixture is composed of silicon micro powder, silicon carbide powder, and attapulgite powder in a mass ratio of 4-16:0.5-2:0.05-0.2;

[0014] Preferably, the solid mixture is composed of silicon micro powder, silicon carbide powder, and attapulgite powder in a mass ratio of 6-12:0.8-1.2:0.08-0.12.

[0015] In some embodiments of the present invention, the fireproof and heat-insulating coating powder is made from the following raw materials in parts by weight: 450-1800 parts of black silicate binder, 90-360 parts of white silicate binder, 75-300 parts of expanded perlite, 425-1700 parts of expanded vermiculite, 10-40 parts of cenospheres, 110-440 parts of mica, 1.5-6 parts of hydroxypropyl cellulose, 0.1-0.4 parts of sodium dodecyl sulfate, 2-8 parts of zirconium-containing aluminosilicate fiber, and 25-100 parts of alumina fiber;

[0016] Preferably, the fireproof and heat-insulating coating powder is made from the following raw materials in parts by weight: 600-1200 parts black silicate binder, 150-210 parts white silicate binder, 100-200 parts expanded perlite, 700-1000 parts expanded vermiculite, 15-25 parts cenospheres, 180-250 parts mica, 2-4 parts hydroxypropyl cellulose, 0.1-0.3 parts sodium dodecyl sulfate, 3-5 parts zirconium-containing aluminum silicate fiber, and 40-60 parts alumina fiber.

[0017] In some embodiments of the present invention, the decorative coating is made from raw materials comprising the following parts by weight: 10-40 parts diatomaceous earth, 6-24 parts closed-cell perlite, 40-160 parts expanded vermiculite, 10-40 parts microspheres, 100-400 parts alumina fiber, 250-1000 parts aluminosilicate fiber, 5-20 parts titanium dioxide, 2-8 parts zirconium-containing aluminosilicate fiber, 1.5-6 parts polyvinyl alcohol powder, 15-60 parts latex powder, and 0.1-0.4 parts turquoise blue.

[0018] Preferably, the decorative coating is made from the following raw materials in parts by weight: 10-30 parts diatomaceous earth, 8-16 parts closed-cell perlite, 60-100 parts expanded vermiculite, 10-30 parts microspheres, 10-300 parts alumina fiber, 400-600 parts aluminum silicate fiber, 8-12 parts titanium dioxide, 2-6 parts zirconium-containing aluminum silicate fiber, 2-5 parts polyvinyl alcohol powder, 20-40 parts latex powder, and 0.15-0.3 parts turquoise blue.

[0019] In some embodiments of the present invention, the interface agent is made from the following raw materials in parts by weight: 90,540 parts of flame retardant emulsion, 35 parts of solid mixture, 122 parts of alcohol ester, 22 parts of vitrified microspheres, 0.1 parts of hydroxyethyl cellulose, and 20-30 parts of water; the solid mixture is composed of silicon micro powder, silicon carbide powder, and attapulgite powder in a mass ratio of 8:1:0.1.

[0020] The fireproof and heat-insulating coating powder is made from the following raw materials in parts by weight: 900 parts black silicate binder, 180 parts white silicate binder, 150 parts expanded perlite, 850 parts expanded vermiculite, 20 parts cenospheres, 220 parts mica, 3 parts hydroxypropyl cellulose, 0.2 parts sodium dodecyl sulfate, 4 parts zirconium-containing aluminosilicate fiber, and 50 parts alumina fiber.

[0021] The decorative coating is made from the following raw materials in parts by weight: 20 parts diatomaceous earth, 12 parts closed-cell perlite, 80 parts expanded vermiculite, 20 parts microspheres, 200 parts alumina fiber, 500 parts aluminum silicate fiber, 10 parts titanium dioxide, 4 parts zirconium-containing aluminum silicate fiber, 3 parts polyvinyl alcohol powder, 30 parts latex powder, and 0.2 parts turquoise blue.

[0022] In some embodiments of the present invention, the particle size of closed-cell perlite is 80-120 mesh, preferably 100 mesh;

[0023] The particle size of the expanded vermiculite is 180-220 mesh, preferably 200 mesh;

[0024] The particle size of the microspheres is 120-180 mesh, preferably 150 mesh.

[0025] This invention discloses a method for preparing a non-intumescent fire-retardant coating for steel structures, comprising the following steps:

[0026] Preparation of interface agent: Prepare the raw materials of interface agent according to the proportion, mix them evenly, and the product is obtained;

[0027] Preparation of fire-retardant and heat-insulating coating: Prepare the raw materials of fire-retardant and heat-insulating coating according to the proportion, mix them evenly, and the coating is obtained.

[0028] Preparation of decorative coating: Prepare the raw materials of the decorative coating according to the proportions, mix them evenly, and the coating is obtained.

[0029] This invention discloses the application of a non-intumescent fire-retardant coating for steel structures in the preparation of a multi-layered protective system for non-intumescent steel structures.

[0030] The present invention discloses a non-expansion steel structure multilayer protection system, which is made of the above-mentioned non-expansion steel structure fireproof coating, including an interface layer, a fireproof and heat-insulating coating layer and a finishing coating layer;

[0031] The interface layer is formed by uniformly applying an interface agent to the surface of the steel structure; the fireproof and heat-insulating coating layer is formed by applying a fireproof and heat-insulating coating containing an interface agent; and the finishing coating layer is formed by applying a finishing coating containing an interface agent.

[0032] Preferably, the fire-retardant coating containing an interface agent is a mixture of fire-retardant and heat-insulating coating, water, and interface agent in a mass ratio of 80-120:13-170:3-8, and more preferably, the fire-retardant and heat-insulating coating:water:interface agent = 100:150:5;

[0033] Preferably, the decorative coating containing the interface agent is a mixture of the decorative coating, water, and interface agent in a mass ratio of 80-120:13-170:6-10, and more preferably, the ratio of decorative coating:water:interface agent is 100:150:8.

[0034] When using the non-intumescent fire-retardant coating for steel structures according to the present invention, the steel structure surface is cleaned and coated with anti-rust paint. An interface agent is then evenly applied to the steel structure surface. Before the interface layer is completely dry, a coat of fire-retardant coating containing the interface agent is sprayed first, followed by another coat of the same fire-retardant coating to the specified thickness. Finally, a coat of finishing coating containing the interface agent is applied to the specified thickness, and then cured.

[0035] The applicant found in their research that the addition of cement and silicate binders easily causes the interface agent to gel. Acidic emulsions such as tert-vinyl acetate emulsions, vinyl acetate-acrylic emulsions, tert-carbonate emulsions, and ethylene-vinyl acetate copolymer emulsions exhibit poor water resistance, making them unsuitable for use as outdoor non-intumescent fire-retardant coatings. Silicone-acrylic emulsions have the best water resistance, but they also easily cause the interface agent to gel rapidly. The addition of cement can improve the water resistance of the emulsion.

[0036] The applicant discovered that within the heating range of 400℃-1200℃, the volume of white silicate binder generally decreases with increasing temperature, while the volume of black silicate binder generally increases. Relying solely on either white or black silicate binder is detrimental to maintaining the volume stability of the fire-retardant coating at high temperatures. Therefore, this invention employs a compound system of white and black silicate binders.

[0037] The applicant discovered that the volume of basalt fibers gradually decreases with increasing temperature, but the reduction is not significant. When the temperature reaches around 1150℃, the volume of basalt fibers shrinks sharply. Using basalt as a refractory material carries some risks. However, it can be used as a heat insulation material in multi-layer fire-retardant coatings. During the heating process, mineral wool fibers expand in volume, decreasing and then increasing with increasing temperature. When the temperature of mineral wool fibers exceeds approximately 950℃, the volume increases. The properties of mineral wool can be utilized, combined with the temperature-increase-volume characteristic of black silicates, to prepare a fire-retardant insulation layer with relatively stable volume. Between 400℃ and 550℃, the volume change of carbon fibers is small, indicating that carbon fibers are relatively stable within this temperature range. When the temperature exceeds approximately 550℃, the carbon fiber pixels shrink linearly and sharply. This indicates that carbon fibers cannot be used as a reinforcing material for fire-retardant coatings at 550℃. Throughout the heating process, zirconium-containing aluminosilicate fibers exhibit relatively stable volume at high temperatures and can be used as a reinforcing material for fire-retardant coatings.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The non-intumescent fireproof coating for steel structures of the present invention consists of three parts: an interface agent, a fireproof and heat-insulating coating, and a finishing coating. It has a heterogeneous structure and has good fireproof performance, aging resistance, and comprehensive performance. Attached Figure Description

[0040] Appendix Figure 1 This is a schematic diagram of the thermocouple arrangement in Experiment Example 1;

[0041] Appendix Figure 2 This is a view of the steel beam after the fire resistance test in Example 1. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the reagent supplier shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0043] Example 1

[0044] This embodiment discloses a method for preparing the fire-retardant coating of the present invention, as detailed below:

[0045] 1. Preparation of interfacial agents

[0046] Table 1-1 Ingredients of Interface Agent in Example 1

[0047]

[0048] The production steps of the interface agent are as follows:

[0049] (1) Weigh the materials in Table 1-1 according to the proportions;

[0050] (2) Add water to the mixing tank in sequence, and pour in 1 / 2 part of alcohol ester 12;

[0051] (3) Start the mixer, set the mixer speed to 1500 r / min, slowly add the metered hydroxyethyl cellulose, and stir for 20 min;

[0052] (4) Adjust the mixer speed to 900 r / min and slowly add the solid mixture into the mixing tank;

[0053] (5) While stirring, pour in the measured amount of flame retardant emulsion 905;

[0054] (6) Pour in the remaining alcohol ester 12;

[0055] (7) Reduce the mixer speed to 500 r / min and slowly add the vitrified microspheres;

[0056] (8) Continue stirring for 20 minutes to obtain a uniform and thick interface agent.

[0057] 2. Production of fire-retardant and heat-insulating coating powder

[0058] Table 1-2 Ingredients Table for Fireproof and Heat-Insulating Coating in Example 1

[0059] No. Raw material name Weight parts 1 Black silicate binder 900 2 White silicate binder 180 3 Expanded perlite 150 4 Expanded vermiculite 850 5 Floating bead 20 6 Mica 220 7 Hydroxypropyl cellulose 3 8 Sodium dodecyl sulfate 0.2 9 Zirconium-containing aluminum silicate fiber 4 10 Alumina fiber 50

[0060] The production steps for fire-retardant and heat-insulating coatings are as follows:

[0061] (1) Weigh the materials in Table 1-2 according to the proportions;

[0062] (2) Start the dry powder mixer, add the measured amount of zirconium-containing aluminum silicate fiber and alumina fiber in sequence, and stir for about 5 minutes to fully disperse these fibers;

[0063] (3) Add expanded perlite, expanded vermiculite, cenospheres, mica, hydroxypropyl cellulose and sodium dodecyl sulfate to the dry powder mixer in sequence. After the feeding is completed, continue to stir for 4 minutes.

[0064] (4) Finally, add black silicate binder and white silicate binder, and continue stirring for 10 minutes to obtain fireproof and heat-insulating coating.

[0065] 3. Production of decorative coatings

[0066] Table 1-3 Example 1 Decorative Coating Ingredient List

[0067] No. Raw material name Weight parts 1 Diatomaceous earth 20 2 Closed-cell perlite (80 mesh) 12 3 Expanded vermiculite (220 mesh) 80 4 Microbead (180 mesh) 20 5 Alumina fiber 200 6 Aluminum silicate fiber 500 7 Titanium white powder 10 8 Zirconium-containing aluminum silicate fiber 4 9 Polyvinyl alcohol powder 3 10 Latex powder 30 11 Cobalt blue 0.2

[0068] The production steps for the finishing powder are as follows:

[0069] (1) Weigh the materials in Table 1-3 according to the proportions;

[0070] (2) Start the dry powder mixer, add the measured materials mentioned above in sequence, and stir for about 30 minutes to fully disperse the fibers and obtain the decorative coating.

[0071] Example 2

[0072] This embodiment discloses a method for preparing the fire-retardant coating of the present invention, as detailed below:

[0073] 1. Preparation of interfacial agents

[0074] Table 2-1 Ingredients of Interface Agent in Example 2

[0075]

[0076] The production steps of the interface agent are as follows:

[0077] (1) Weigh the materials in Table 2-1 according to the proportions;

[0078] (2) Add water to the mixing tank in sequence, and pour in 1 / 3 part of alcohol ester 12;

[0079] (3) Start the mixer, set the mixer speed to 1000 r / min, slowly add the metered hydroxyethyl cellulose, and stir for 30 min;

[0080] (4) Adjust the mixer speed to 800 r / min and slowly add the solid mixture into the mixing tank;

[0081] (5) While stirring, pour in the measured amount of flame retardant emulsion 905;

[0082] (6) Pour in the remaining alcohol ester 12;

[0083] (7) Reduce the mixer speed to 400 r / min and slowly add the vitrified microspheres;

[0084] (8) Continue stirring for 30 minutes to obtain a uniform and thick interface agent.

[0085] 2. Production of fire-retardant and heat-insulating coating powder

[0086] Table 2-2 Ingredient list of fireproof and heat-insulating coating for Example 2

[0087]

[0088]

[0089] The production steps for fire-retardant and heat-insulating coatings are as follows:

[0090] (1) Weigh the materials in Table 2-2 according to the proportions;

[0091] (2) Start the dry powder mixer, add the measured amount of zirconium-containing aluminum silicate fiber and alumina fiber in sequence, and stir for about 10 minutes to fully disperse these fibers;

[0092] (3) Add expanded perlite, expanded vermiculite, cenospheres, mica, hydroxypropyl cellulose and sodium dodecyl sulfate to the dry powder mixer in sequence. After the feeding is completed, continue to stir for 10 minutes.

[0093] (4) Finally, add black silicate binder and white silicate binder, and continue stirring for 20 minutes to obtain fireproof and heat-insulating coating.

[0094] 3. Production of decorative coatings

[0095] Table 2-3 Example 2 Finishing Coating Ingredient List

[0096] No. Raw material name Weight parts 1 Diatomaceous earth 10 2 Closed-cell perlite (120 mesh) 6 3 Expanded vermiculite (180 mesh) 40 4 Microbead (120 mesh) 10 5 Alumina fiber 120 6 Aluminum silicate fiber 250 7 Titanium white powder 8 8 Zirconium-containing aluminum silicate fiber 2 9 Polyvinyl alcohol powder 2 10 Latex powder 15 11 Cobalt blue 0.1

[0097] The production steps for the finishing powder are as follows:

[0098] (1) Weigh the materials in Table 2-3 according to the proportions;

[0099] (2) Start the dry powder mixer, add the measured materials mentioned above in sequence, and stir for about 30 minutes to fully disperse the fibers and obtain the decorative coating.

[0100] Example 3

[0101] This embodiment discloses a method for preparing the fire-retardant coating of the present invention, as detailed below:

[0102] 1. Preparation of interfacial agents

[0103] Table 3-1 Ingredients of Interface Agent in Example 3

[0104]

[0105] The production steps of the interface agent are as follows:

[0106] (1) Weigh the materials in Table 3-1 according to the proportions;

[0107] (2) Add water to the mixing tank in sequence, and pour in 1 / 2 part of alcohol ester 12;

[0108] (3) Start the mixer and set the mixer speed to 1800 r / min. Slowly add the measured amount of hydroxyethyl cellulose and stir for 30 min.

[0109] (4) Adjust the mixer speed to 900 r / min and slowly add the solid mixture into the mixing tank;

[0110] (5) While stirring, pour in the measured amount of flame retardant emulsion 905;

[0111] (6) Pour in the remaining alcohol ester 12;

[0112] (7) Reduce the mixer speed to 600 r / min and slowly add the vitrified microspheres;

[0113] (8) Continue stirring for 30 minutes to obtain a uniform and thick interface agent.

[0114] 2. Production of fire-retardant and heat-insulating coating powder

[0115] Table 3-2 Ingredient list for fireproof and heat-insulating coating in Example 3

[0116] No. Raw material name Weight parts 1 Black silicate binder 600 2 White silicate binder 110 3 Expanded perlite 120 4 Expanded vermiculite 425 5 Floating bead 15 6 Mica 110 7 Hydroxypropyl cellulose 1.5 8 Sodium dodecyl sulfate 0.1 9 Zirconium-containing aluminum silicate fiber 2 10 Alumina fiber 25

[0117] The production steps for fire-retardant and heat-insulating coatings are as follows:

[0118] (1) Weigh the materials in Table 3-2 according to the proportions;

[0119] (2) Start the dry powder mixer, add the measured amount of zirconium-containing aluminum silicate fiber and alumina fiber in sequence, and stir for about 5 minutes to fully disperse these fibers;

[0120] (3) Add expanded perlite, expanded vermiculite, cenospheres, mica, hydroxypropyl cellulose and sodium dodecyl sulfate to the dry powder mixer in sequence. After the feeding is completed, continue to stir for 5 minutes.

[0121] (4) Finally, add black silicate binder and white silicate binder, and continue stirring for 15 minutes to obtain fireproof and heat-insulating coating.

[0122] 3. Production of decorative coatings

[0123] Table 3-3 Ingredients of Finishing Coating for Example 3

[0124] No. Raw material name Weight parts 1 Diatomaceous earth 30 2 Closed-cell perlite (100 mesh) 16 3 Expanded vermiculite (200 mesh) 40 4 Microbead (180 mesh) 15 5 Alumina fiber 280 6 Aluminum silicate fiber 600 7 Titanium white powder 12 8 Zirconium-containing aluminum silicate fiber 6 9 Polyvinyl alcohol powder 5 10 Latex powder 35 11 Cobalt blue 0.15

[0125] The production steps for the finishing powder are as follows:

[0126] (1) Weigh the materials in Table 3-3 according to the proportions;

[0127] (2) Start the dry powder mixer, add the measured materials mentioned above in sequence, and stir for about 20 minutes to fully disperse the fibers and obtain the decorative coating.

[0128] Example 4

[0129] This embodiment discloses a method for preparing the fire-retardant coating of the present invention, as detailed below:

[0130] 1. Preparation of interfacial agents

[0131] Table 4-1 Ingredients of Interface Agent in Example 4

[0132]

[0133] The production steps of the interface agent are as follows:

[0134] (1) Weigh the materials in Table 4-1 according to the proportions;

[0135] (2) Add water to the mixing tank in sequence, and pour in 2 / 3 of the alcohol ester 12;

[0136] (3) Start the mixer and set the mixer speed to 1800 r / min. Slowly add the measured amount of hydroxyethyl cellulose and stir for 30 min.

[0137] (4) Adjust the mixer speed to 800 r / min and slowly add the solid mixture into the mixing tank;

[0138] (5) While stirring, pour in the measured amount of flame retardant emulsion 905;

[0139] (6) Pour in the remaining alcohol ester 12;

[0140] (7) Reduce the mixer speed to 400 r / min and slowly add the vitrified microspheres;

[0141] (8) Continue stirring for 10 minutes to obtain a uniform and thick interface agent.

[0142] 2. Production of fire-retardant and heat-insulating coating powder

[0143] Table 4-2 Ingredient list of fireproof and heat-insulating coating for Example 4

[0144] No. Raw material name Weight parts 1 Black silicate binder 1200 2 White silicate binder 150 3 Expanded perlite 100 4 Expanded vermiculite 700 5 Floating bead 20 6 Mica 300 7 Hydroxypropyl cellulose 3 8 Sodium dodecyl sulfate 0.2 9 Zirconium-containing aluminum silicate fiber 5 10 Alumina fiber 40

[0145] The production steps for fire-retardant and heat-insulating coatings are as follows:

[0146] (1) Weigh the materials in Table 4-2 according to the proportions;

[0147] (2) Start the dry powder mixer, add the measured amount of zirconium-containing aluminum silicate fiber and alumina fiber in sequence, and stir for about 5 minutes to fully disperse these fibers;

[0148] (3) Add expanded perlite, expanded vermiculite, cenospheres, mica, hydroxypropyl cellulose and sodium dodecyl sulfate to the dry powder mixer in sequence. After the feeding is completed, continue to stir for 4 minutes.

[0149] (4) Finally, add black silicate binder and white silicate binder, and continue stirring for 10 minutes to obtain fireproof and heat-insulating coating.

[0150] 3. Production of decorative coatings

[0151] Table 4-3 Example 4 Finishing Coating Ingredient List

[0152] No. Raw material name Weight parts 1 Diatomaceous earth 40 2 Closed-cell perlite (120 mesh) 24 3 Expanded vermiculite (200 mesh) 160 4 Microbead (150 mesh) 40 5 Alumina fiber 300 6 Aluminum silicate fiber 1000 7 Titanium white powder 20 8 Zirconium-containing aluminum silicate fiber 8 9 Polyvinyl alcohol powder 6 10 Latex powder 60 11 Cobalt blue 0.4

[0153] The production steps for the finishing powder are as follows:

[0154] (1) Weigh the materials in Table 4-3 according to the proportions;

[0155] (2) Start the dry powder mixer, add the measured materials mentioned above in sequence, and stir for about 30 minutes to fully disperse the fibers and obtain the decorative coating.

[0156] Example 5

[0157] This embodiment discloses a method for preparing the fire-retardant coating of the present invention, as detailed below:

[0158] 1. Preparation of interfacial agents

[0159] Table 5-1 Ingredients of Interface Agent in Example 5

[0160]

[0161] The production steps of the interface agent are as follows:

[0162] (1) Weigh the materials in Table 5-1 according to the proportions;

[0163] (2) Add water to the mixing tank in sequence, and pour in 1 / 2 part of alcohol ester 12;

[0164] (3) Start the mixer, set the mixer speed to 1500 r / min, slowly add the metered hydroxyethyl cellulose, and stir for 20 min;

[0165] (4) Adjust the mixer speed to 900 r / min and slowly add the solid mixture into the mixing tank;

[0166] (5) While stirring, pour in the measured amount of flame retardant emulsion 905;

[0167] (6) Pour in the remaining alcohol ester 12;

[0168] (7) Reduce the mixer speed to 500 r / min and slowly add the vitrified microspheres;

[0169] (8) Continue stirring for 20 minutes to obtain a uniform and thick interface agent.

[0170] 2. Production of fire-retardant and heat-insulating coating powder

[0171] Table 5-2 Ingredient list of fireproof and heat-insulating coating for Example 5

[0172] No. Raw material name Weight parts 1 Black silicate binder 1500 2 White silicate binder 210 3 Expanded perlite 300 4 Expanded vermiculite 1000 5 Floating bead 40 6 Mica 250 7 Hydroxypropyl cellulose 6 8 Sodium dodecyl sulfate 0.4 9 Zirconium-containing aluminum silicate fiber 8 10 Alumina fiber 60

[0173] The production steps for fire-retardant and heat-insulating coatings are as follows:

[0174] (1) Weigh the materials in Table 5-2 according to the proportions;

[0175] (2) Start the dry powder mixer, add the measured amount of zirconium-containing aluminum silicate fiber and alumina fiber in sequence, and stir for about 5 minutes to fully disperse these fibers;

[0176] (3) Add expanded perlite, expanded vermiculite, cenospheres, mica, hydroxypropyl cellulose and sodium dodecyl sulfate to the dry powder mixer in sequence. After the feeding is completed, continue to stir for 4 minutes.

[0177] (4) Finally, add black silicate binder and white silicate binder, and continue stirring for 10 minutes to obtain fireproof and heat-insulating coating.

[0178] 3. Production of decorative coatings

[0179] Table 5-3 Example 5 Decorative Coating Ingredient List

[0180]

[0181]

[0182] The production steps for the finishing powder are as follows:

[0183] (1) Weigh the materials in Table 5-3 according to the proportions;

[0184] (2) Start the dry powder mixer, add the measured materials mentioned above in sequence, and stir for about 30 minutes to fully disperse the fibers and obtain the decorative coating.

[0185] Example 6

[0186] This embodiment discloses a method for preparing the fire-retardant coating of the present invention, as detailed below:

[0187] 1. Preparation of interfacial agents

[0188] Table 6-1 Ingredients of Interface Agent in Example 6

[0189]

[0190] The production steps of the interface agent are as follows:

[0191] (1) Weigh the materials in Table 6-1 according to the proportions;

[0192] (2) Add water to the mixing tank in sequence, and pour in 1 / 2 part of alcohol ester 12;

[0193] (3) Start the mixer, set the mixer speed to 1500 r / min, slowly add the metered hydroxyethyl cellulose, and stir for 20 min;

[0194] (4) Adjust the mixer speed to 900 r / min and slowly add the solid mixture into the mixing tank;

[0195] (5) While stirring, pour in the measured amount of flame retardant emulsion 905;

[0196] (6) Pour in the remaining alcohol ester 12;

[0197] (7) Reduce the mixer speed to 500 r / min and slowly add the vitrified microspheres;

[0198] (8) Continue stirring for 20 minutes to obtain a uniform and thick interface agent.

[0199] 2. Production of fire-retardant and heat-insulating coating powder

[0200] Table 6-2 Ingredient list for fireproof and heat-insulating coating in Example 6

[0201]

[0202]

[0203] The production steps for fire-retardant and heat-insulating coatings are as follows:

[0204] (1) Weigh the materials in Table 6-2 according to the proportions;

[0205] (2) Start the dry powder mixer, add the measured amount of zirconium-containing aluminum silicate fiber and alumina fiber in sequence, and stir for about 5 minutes to fully disperse these fibers;

[0206] (3) Add expanded perlite, expanded vermiculite, cenospheres, mica, hydroxypropyl cellulose and sodium dodecyl sulfate to the dry powder mixer in sequence. After the feeding is completed, continue to stir for 4 minutes.

[0207] (4) Finally, add black silicate binder and white silicate binder, and continue stirring for 10 minutes to obtain fireproof and heat-insulating coating.

[0208] 3. Production of decorative coatings

[0209] Table 6-3 Example 6 Finishing Coating Ingredient List

[0210] No. Raw material name Weight parts 1 Diatomaceous earth 35 2 Closed-cell perlite (100 mesh) 24 3 Expanded vermiculite (220 mesh) 100 4 Microbead (150 mesh) 40 5 Alumina fiber 400 6 Aluminum silicate fiber 400 7 Titanium white powder 12 8 Zirconium-containing aluminum silicate fiber 6 9 Polyvinyl alcohol powder 5 10 Latex powder 40 11 Cobalt blue 0.3

[0211] The production steps for the finishing powder are as follows:

[0212] (1) Weigh the materials in Table 6-3 according to the proportions;

[0213] (2) Start the dry powder mixer, add the measured materials mentioned above in sequence, and stir for about 30 minutes to fully disperse the fibers and obtain the decorative coating.

[0214] Experimental Example 1

[0215] This experimental example discloses the performance testing of the fire-retardant coating of the present invention. First, the fire-retardant coating of Example 1 was applied to a steel beam to prepare a sample, and then the performance was tested.

[0216] 1. Sample preparation

[0217] The fire resistance test uses 36b hot-rolled I-beams as specified in GB / T706-2016. Rust, oil, dust and other debris are removed from the surface of the steel structure. Then, epoxy zinc-rich anti-rust paint is applied in one coat with a thickness of about 40-80 μm, and the structure is cured indoors for 24 hours.

[0218] Apply the interface agent evenly to the surface of the I-beam. Before the interface layer is completely dry, first spray one coat of fire-retardant coating containing the interface agent (fire-retardant and heat-insulating coating: water: interface agent = 100:150:5, mass ratio), then apply another coat of the same fire-retardant coating to a thickness of 40mm. Finally, apply one coat of finishing coating containing the interface agent (finishing coating: water: interface agent = 100:150:8, mass ratio) to the test thickness. After curing for 25 days, the specified test conditions are met.

[0219] 2. Testing

[0220] During the fire resistance test, four standard cover plates were placed on the upper surface of the steel beam specimen. The cover plates had a density of 800 kg / m³. 3 The specimen is a lightweight concrete slab, 150 mm thick, 1000 mm long, and 600 mm wide. A layer of aluminum silicate fiber cotton, with a width equal to the width of the upper flange of the beam, is placed between the cover plate and the upper flange of the beam. The specimen is loaded with a four-point concentrated load (simulating a uniformly distributed load). A total of 12 thermocouples are arranged inside the steel beam, as shown in the attached diagram. Figure 1 As shown. The calculated span of the steel beam is 4200mm, and the total external load is 207kN.

[0221] The physical and chemical performance test specimens were sampled in accordance with the requirements of GB14907-2018 "Fireproof Coatings for Steel Structures".

[0222] The results are shown in the table below:

[0223] Table 7 Test Results

[0224]

[0225]

[0226] After the test, the steel beam was removed from the refractory furnace, and its appearance was as shown in the attached image. Figure 2 As shown in the attached diagram at the end of the test, the non-expansion steel structure multilayer protection system of the present invention can achieve a durability requirement of 4.0 hours.

[0227] The invention's non-intumescent steel structure multi-layer protection system was compared with the test reports of non-intumescent steel structure fire-retardant coatings produced by major fire-retardant coating manufacturers in the prior art. The results are as follows:

[0228] Table 8. Analysis of Technical Indicators of Non-Intumescent Fireproof Coatings for Steel Structures

[0229]

[0230] As can be seen from the table above, it has the following characteristics:

[0231] (1) The fire resistance limit of non-intumescent steel structure fireproof coating reaches 4.0h, and the thickness of the fireproof coating needs to reach or exceed 40mm.

[0232] (2) The multi-layer fire protection technology of the present invention, the multi-layer fire protection system developed has a temperature of less than 400°C inside the steel beam after 4 hours, which shows excellent heat insulation performance.

[0233] (3) Judging from the maximum bending deformation at the end of the test, the deformation of the multi-layer fire protection system is lower than that of its peers.

[0234] (4) The number of cracks at the end of the test was the fewest in the multi-layer fire protection system.

[0235] 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 non-intumescent fireproofing coating for steel structures, characterized in that, Interface agent, fireproof and thermal insulation coating powder and finishing material coating; The interface agent is made of raw materials including 90-520 parts by weight of fire-retardant emulsion, 15-70 parts by weight of solid mixture, 1-24 parts by weight of alcohol ester, 11-44 parts by weight of vitrified microbead, 0.05-0.2 parts by weight of hydroxyethyl cellulose and 10-60 parts by weight of water; the solid mixture is composed of silicon powder, silicon carbide powder and attapulgite powder in a mass ratio of 4-16:0.5-2:0.05-0.2; The fireproof and thermal insulation coating powder is made of raw materials including 450-1800 parts by weight of black silicate binder, 90-360 parts by weight of white silicate binder, 75-300 parts by weight of expanded perlite, 425-1700 parts by weight of expanded vermiculite, 10-40 parts by weight of floating bead, 110-440 parts by weight of mica, 1.5-6 parts by weight of hydroxypropyl cellulose, 0.1-0.4 parts by weight of sodium dodecyl sulfate, 2-8 parts by weight of zirconium-containing aluminum silicate fiber and 25-100 parts by weight of aluminum oxide fiber; The finishing material coating is made of raw materials including 10-40 parts by weight of diatomite, 6-24 parts by weight of closed perlite, 40-160 parts by weight of expanded vermiculite, 10-40 parts by weight of microbead, 100-400 parts by weight of aluminum oxide fiber, 250-1000 parts by weight of aluminum silicate fiber, 5-20 parts by weight of titanium white, 2-8 parts by weight of zirconium-containing aluminum silicate fiber, 1.5-6 parts by weight of polyvinyl alcohol powder, 15-60 parts by weight of latex powder and 0.1-0.4 parts by weight of emerald blue.

2. A non-intumescent fireproofing coating for steel structures according to claim 1, characterized in that, The interface agent is made of raw materials including 90-520 parts by weight of fire-retardant emulsion, 15-70 parts by weight of solid mixture, 1-24 parts by weight of alcohol ester, 11-44 parts by weight of vitrified microbead, 0.05-0.2 parts by weight of hydroxyethyl cellulose and 10-60 parts by weight of water; the solid mixture is composed of silicon powder, silicon carbide powder and attapulgite powder in a mass ratio of 4-16:0.5-2:0.05-0.2; 3. The non-intumescent fireproof coating for steel structure according to claim 1, characterized in that, The solid mixture is composed of silicon powder, silicon carbide powder and attapulgite powder in a mass ratio of 6-12:0.8-1.2:0.08-0.

12.

4. The non-intumescent fireproof coating for steel structure according to claim 1, characterized in that, The fireproof and thermal insulation coating powder is made of raw materials including 450-1800 parts by weight of black silicate binder, 90-360 parts by weight of white silicate binder, 75-300 parts by weight of expanded perlite, 425-1700 parts by weight of expanded vermiculite, 10-40 parts by weight of floating bead, 110-440 parts by weight of mica, 1.5-6 parts by weight of hydroxypropyl cellulose, 0.1-0.4 parts by weight of sodium dodecyl sulfate, 2-8 parts by weight of zirconium-containing aluminum silicate fiber and 25-100 parts by weight of aluminum oxide fiber; 5. The non-intumescent fireproofing coating for steel structures according to claim 1, characterized in that, The finishing material coating is made of raw materials including 10-40 parts by weight of diatomite, 6-24 parts by weight of closed perlite, 40-160 parts by weight of expanded vermiculite, 10-40 parts by weight of microbead, 100-400 parts by weight of aluminum oxide fiber, 250-1000 parts by weight of aluminum silicate fiber, 5-20 parts by weight of titanium white, 2-8 parts by weight of zirconium-containing aluminum silicate fiber, 1.5-6 parts by weight of polyvinyl alcohol powder, 15-60 parts by weight of latex powder and 0.1-0.4 parts by weight of emerald blue.

6. The non-intumescent fireproofing coating for steel structures according to claim 1, characterized in that, The interface agent is made of raw materials including 90-520 parts by weight of fire-retardant emulsion, 15-70 parts by weight of solid mixture, 1-24 parts by weight of alcohol ester, 11-44 parts by weight of vitrified microbead, 0.05-0.2 parts by weight of hydroxyethyl cellulose and 10-60 parts by weight of water; the solid mixture is composed of silicon powder, silicon carbide powder and attapulgite powder in a mass ratio of 4-16:0.5-2:0.05-0.2; The fireproof and heat-insulating coating powder is made of raw materials including 900 parts by weight of black silicate binder, 180 parts by weight of white silicate binder, 150 parts by weight of expanded perlite, 850 parts by weight of expanded vermiculite, 20 parts by weight of floating bead, 220 parts by weight of mica, 3 parts by weight of hydroxypropyl cellulose, 0.2 parts by weight of sodium dodecyl sulfate, 4 parts by weight of zirconium-containing aluminum silicate fiber, and 50 parts by weight of aluminum oxide fiber. The finishing coating is made of raw materials including 20 parts by weight of diatomite, 12 parts by weight of closed-cell perlite, 80 parts by weight of expanded vermiculite, 20 parts by weight of microbead, 200 parts by weight of aluminum oxide fiber, 500 parts by weight of aluminum silicate fiber, 10 parts by weight of titanium white, 4 parts by weight of zirconium-containing aluminum silicate fiber, 3 parts by weight of polyvinyl alcohol powder, 30 parts by weight of latex powder, and 0.2 parts by weight of emerald blue.

7. The non-intumescent fireproof coating for steel structure according to any one of claims 1-6, characterized in that, The closed-cell perlite has a particle size of 80-120 mesh; Or / and the expanded vermiculite has a particle size of 180-220 mesh; Or / and the microbead has a particle size of 120-180 mesh.

8. A non-intumescent fireproofing coating for steel structures according to claim 7, characterized in that, The closed-cell perlite has a particle size of 100 mesh; Or / and the expanded vermiculite has a particle size of 200 mesh; Or / and the microbead has a particle size of 150 mesh.

9. The method for preparing a non-intumescent fireproof coating for steel structure according to any one of claims 1-8, characterized in that, The method comprises the following steps: Preparation of the interface agent: the raw materials of the interface agent are prepared in proportion and uniformly mixed to obtain the interface agent; Preparation of the fireproof and heat-insulating coating: the raw materials of the fireproof and heat-insulating coating are prepared in proportion and uniformly mixed to obtain the fireproof and heat-insulating coating; Preparation of the finishing material coating: the raw materials of the finishing material coating are prepared in proportion and uniformly mixed to obtain the finishing material coating.

10. Use of the non-intumescent fireproof coating for steel structure according to any one of claims 1-8 in the preparation of a non-intumescent fireproof coating system for steel structure.

11. A non-intumescent steel structure multi-coat protection system, characterized by, The non-intumescent fireproof coating for steel structure according to any one of claims 1-8 comprises an interface layer, a fireproof and heat-insulating coating layer, and a finishing coating layer; The interface layer is formed by uniformly coating the interface agent on the surface of the steel structure; the fireproof and heat-insulating coating layer is formed by applying the fireproof and heat-insulating coating containing the interface agent; and the finishing coating layer is formed by applying the finishing coating containing the interface agent; The fireproof and heat-insulating coating containing the interface agent is prepared by mixing the fireproof and heat-insulating coating, water, and the interface agent in a mass ratio of 80-120:13-170:3-8; and the finishing coating containing the interface agent is prepared by mixing the finishing coating, water, and the interface agent in a mass ratio of 80-120:13-170:6-10.

12. A non-intumescent steel construction multicovering protection system according to claim 11, characterized in that Fireproof and heat-insulating coating:water:interface agent = 100:150:

5.

13. A non-intumescent steel construction multicovering protection system according to claim 11, characterized in that Finishing coating:water:interface agent = 100:150:8.

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