Ceramic fire-resistant sealant for bridge, fireproof structure, preparation equipment and preparation method

Abstract

The invention discloses a ceramic fire-resistant sealant for a bridge, a fireproof structure, a preparation device and a preparation method, and relates to the technical field of sealants for the bridge. The ceramic fire-resistant sealant for the bridge comprises the following specific components in parts by weight: 100 parts of an MS polymer; 0 to 100 parts of a plasticizer; 80 to 150 parts of aluminum hydroxide; 80 to 150 parts of modified wollastonite; 50 to 100 parts of calcium carbonate; 10 to 20 parts of zinc borate; 10 to 20 parts of melamine polyphosphate; 5 to 10 parts of dipentaerythritol; 5 to 10 parts of a dewatering agent; 5 to 10 parts of an adhesion promoter; and 0.5-2 parts of a catalyst. According to the ceramic fire-resistant sealant for the bridge, a rubber body formed after vulcanization is converted into a self-supporting ceramic body under the condition of high temperature or open fire, flame is prevented from diffusing into a material, so that the purposes of flame retardance and fire prevention are achieved, meanwhile, the mechanical property is not obviously attenuated before and after thermal aging, and good elasticity is still kept; and the vulcanized paint has excellent adhesive force to the paint, so that the use effect of the paint is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of sealants for bridges, and in particular relates to a ceramic fire-resistant sealant for bridges, a fire-proof structure, a preparation device and a preparation method. Background Art

[0002] With the vigorous development of transportation, bridge loads are also increasing. When reinforced concrete bridge decks are subjected to the vibration, impact, tension and shear properties of repeated vehicle loads and the shrinkage deformation caused by temperature and climate change, fine cracks will appear on the reinforced concrete bridge deck, causing water seepage or leakage on the bridge deck, resulting in steel corrosion and affecting the durability of the bridge, especially at the junction of the cast-in-place concrete joints of the expansion joints and the center strip and width joints.

[0003] At present, in order to increase the service life of bridges and save maintenance and repair costs, sealants are generally installed at the expansion joints of bridges to achieve the purpose of water-stopping and sealing. The sealants used are mostly vulcanized sealants, but the vulcanized sealants can burn, and the burning is fierce. To address this problem, more and more projects require the use of sealants with flame retardant properties. In the prior art, the sealant is generally made flame-retardant by adding flame retardants to the sealant formula. However, when the sealant with added flame retardants is exposed to high temperature or flame, the flame retardant will decompose, causing the sealant to lose its fireproof ability, affecting the performance of the sealant. Based on this, the present application proposes a ceramic fire-resistant sealant for bridges.

[0004] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide a ceramic fire-resistant sealant, fireproof structure, preparation equipment and preparation method for bridges, which can solve the problem that when the sealant is exposed to high temperature or flame, the flame retardant will decompose, thereby causing the sealant to lose its fireproof ability and affecting the performance of the sealant.

[0006] In order to achieve the above object, a specific embodiment of the present invention provides the following technical solutions: A ceramic fire-resistant sealant for bridges, comprising components of an MS polymer, a plasticizer, aluminum hydroxide, modified wollastonite, calcium carbonate, zinc borate, melamine polyphosphate, dipentaerythritol, a water scavenger, an adhesion promoter, and a catalyst; The contents of the above components are as follows: 100 parts of MS polymer; 0 to 100 parts of plasticizer; 80 to 150 parts of aluminum hydroxide; 80 to 150 parts of modified wollastonite; 50 to 100 parts of calcium carbonate; 10 to 20 parts of zinc borate; 10 to 20 parts of melamine polyphosphate; 5 to 10 parts of dipentaerythritol; 5 to 10 parts of water scavenger; 5 to 10 parts of adhesion promoter; and 0.5 to 2 parts of catalyst. The melamine polyphosphate and dipentaerythritol are used in a ratio of 3:1.

[0007] In one or more embodiments of the present invention, the MS polymer is selected from silane-modified polyether or α-silane-modified polyurethane, the silane-modified polyether includes at least one of S303H, SAX350, SAX580, and SAX750, the α-silane-modified polyurethane includes at least one of STP~E10, STP~E30, and STP~E35, the plasticizer is selected from at least one of alkyl phenyl sulfonate and TCPP, the particle size of the aluminum hydroxide is 5000 mesh; the modified wollastonite is silane-modified or zinc stearate-coated.

[0008] In one or more embodiments of the present invention, the zinc borate is of analytical grade, the dehydrating agent is selected from at least one of p-toluenesulfonyl isocyanate and vinyltrimethoxysilane, the adhesion promoter is selected from at least one of KH550, KH560, KH570, and KH792, and the catalyst is selected from an organotin catalyst, including at least one of U-220H, U-130, TIB 226, and DBTDL.

[0009] A fireproof structure comprises, from the inside to the outside, a composite flexible fireproof heat-insulating material layer, a fireproof winding covering cloth layer, a mass transfer barrier layer and a ceramic fireproof sealant layer.

[0010] A preparation device for ceramic fire-resistant sealant for bridges, comprising: A raw material mixing device includes a mixing device shell, wherein a first rotating shaft is rotatably connected at the center of the top and bottom wall panels of the mixing device shell, and a plurality of stirring members are installed on the side walls of the first rotating shaft at equal intervals, so that the first rotating shaft drives the plurality of stirring members to stir and mix the raw materials added to the mixing device shell. The side walls of the first rotating shaft are fixedly connected to a first mounting plate and a second mounting plate, and a first grinding roller is rotatably connected between the first mounting plate and the second mounting plate, and a second grinding roller is rotatably connected to the bottom of the second mounting plate. When the first rotating shaft drives the stirring members to rotate, it also drives the first grinding roller and the second grinding roller to rotate, so that the solid raw materials in the mixing device shell can be ground and crushed by the first grinding roller and the second grinding roller, and the particle size of the particles is reduced by grinding, so that the raw materials are more fully mixed. At the same time, a dehydration component is installed in the mixing device shell, so that the materials are dehydrated and blended in the mixing device shell.

[0011] The base material dispersing device includes a base material dispersing assembly having a second rotating shaft rotatably connected to the center of the base material dispersing assembly's bottom wall, allowing the second rotating shaft to rotate within the base material dispersing assembly. Multiple sets of shearing and crushing dispersing elements are fixedly connected to the second rotating shaft. The second rotating shaft drives the multiple sets of shearing and crushing dispersing elements to rotate, further refining the material through liquid layer friction and shear force. A high-pressure homogenizing dispersing element is disposed within the base material dispersing assembly, supplying high-pressure gas to the assembly to further refine filler particles through high-pressure shear and cavitation effects. The high-pressure homogenizing dispersing element and the multiple sets of shearing and crushing dispersing elements are positioned opposite each other. When the high-speed rotation of the second rotating shaft drives the shearing and crushing elements to refine the material within the base material dispersing assembly, the centrifugal force generated by the shearing and crushing elements rotates the material. The high-pressure gas supplied by the high-pressure homogenizing dispersing element then acts on the material. The combined action of the shearing and crushing dispersing elements refines the material, achieving nanoscale uniform dispersion, thereby effectively improving the density of the ceramic sealant.

[0012] The conveying and energy-saving component includes a material conveying component and a waste heat recovery component. The material conveying component is used to convey the mixed materials in the mixing device shell to the base material dispersion component. The heat recovery component is used to recover the waste heat in the base material dispersion component and the heat generated by the rotating equipment into the mixing device shell for use, thereby realizing the recovery and utilization of waste heat and avoiding heat waste.

[0013] In one or more embodiments of the present invention, the stirring member includes a stirring impeller, wherein the plurality of stirring impellers are fixedly connected to the sidewalls of the first rotating shaft at equal intervals, so that rotation of the first rotating shaft drives the plurality of stirring impellers to rotate. A plurality of first crushing blades arranged transversely and a plurality of second crushing blades arranged longitudinally are fixedly connected to the front and rear sidewalls of the stirring impeller. Rotation of the stirring impeller drives the first and second crushing blades to rotate, thereby crushing particulate matter in the material, thereby achieving uniform mixing of the material through stirring and crushing. A heating plate is installed within the stirring impeller, so that when the stirring impeller stirs and mixes the material, the heating plate installed within the stirring impeller heats the material, ensuring uniform heating of the material and improving mixing efficiency. An external power supply cable is installed within the first rotating shaft for supplying power to the heating plate. The external power supply cable is connected to an external power source to power the heating plate installed within the stirring impeller. A first motor is installed on the first rotating shaft, which drives the first rotating shaft to rotate. A feed assembly is mounted on the top wall of the mixing device housing, through which raw materials are added to the mixing device housing for mixing. A switch valve is also provided on the feed assembly to create a negative pressure within the mixing device housing. A discharge port is provided on the bottom wall of the mixing device housing, through which the mixed materials within the mixing device housing are discharged.

[0014] In one or more embodiments of the present invention, the first grinding roller abuts against the inner sidewall of the mixing device housing, thereby grinding and crushing solid particles located on the inner sidewall of the mixing device housing. A first scraper is fixedly connected between the first mounting plate and the second mounting plate. One end of the first scraper abuts against the inner sidewall of the mixing device housing. When the first mounting plate and the second mounting plate drive the first scraper to rotate, the first scraper can scrape off material attached to the inner sidewall of the mixing device housing. At the same time, the first scraper and the first grinding roller are arranged relative to each other, so that the material on the inner sidewall of the mixing device housing is ground by the first grinding roller and then scraped off by the first scraper. A pair of third mounting plates are fixedly connected to the bottom of the second mounting plate. A second grinding roller is rotatably connected between the pair of third mounting plates. The second grinding roller abuts against the inner sidewall of the bottom wall plate of the mixing device housing, thereby grinding and crushing solid particles on the bottom sidewall of the mixing device housing through the rotation of the first rotating shaft. A second scraper is fixedly connected to the side wall of the second mounting plate, one end of the second scraper abuts against the inner wall of the bottom wall plate of the mixing device shell, and the second scraper and the second grinding roller are arranged opposite to each other so that the material at the bottom of the mixing device shell is ground by the second grinding roller and then scraped off by the second scraper.

[0015] In one or more embodiments of the present invention, the shearing and crushing dispersion element includes a plurality of first dispersion knives, which are fixedly connected to the side walls of the second rotating shaft at equal intervals, the first dispersion knives at the bottom are arranged horizontally, and a plurality of second dispersion knives are fixedly connected to the upper and lower side walls of the first dispersion knife at the bottom and the upper side wall of the first dispersion knife at the top, and the first dispersion knives on the multiple groups of shearing and crushing dispersion elements are inclined from bottom to bottom in a manner in which the inclination gradually increases, and a second motor is installed at the lower end of the second rotating shaft, and the high-pressure homogenizing dispersion element includes a pressure pipe, which is fixedly connected to the side wall of the base material dispersion component in a through-going manner, and the pressure pipe is placed in the base material dispersion component and a vertical pipe is provided directly above the second rotating shaft, and a plurality of first nozzles are opened on the side wall of the vertical pipe of the pressure pipe in a downwardly inclined manner, and a high-pressure pump is installed at one end of the pressure pipe located outside the base material dispersion component.

[0016] In one or more embodiments of the present invention, the feed assembly includes a delivery pump, the feed port of the delivery pump is equipped with a discharge pipe, the end of the discharge pipe away from the delivery pump is fixedly connected to the bottom of the discharge port, the discharge port of the delivery pump is equipped with a delivery pipe, the end of the delivery pipe away from the delivery pump is installed in a penetrating manner on the side wall of the mixing device shell, so that the mixed material in the mixing device shell is delivered to the base material dispersion assembly through the delivery pump. The waste heat assembly includes a waste heat recovery pipe, which is installed on the bottom wall panel of the base material dispersion assembly, and the top wall panel of the mixing device shell is installed with a second nozzle in an inclined manner at the feed assembly, and the end of the waste heat recovery pipe away from the base material dispersion assembly is installed on the second nozzle. Since the material in the base material dispersion component generates a large amount of heat under the action of high-speed centrifugal rotation, in order to realize the recovery and utilization of heat, the heat generated in the base material dispersion component is transported through the waste heat recovery pipe, and then sprayed to the bottom of the feed component through the second nozzle, so that the heat is recovered to preheat the material added to the mixing device shell, thereby improving the mixing effect of the material in the mixing device shell and realizing the recovery and utilization of the waste heat in the base material dispersion component.

[0017] A method for preparing a ceramic fire-resistant sealant for bridges, the method comprising: Step 1: Add MS polymer, plasticizer, aluminum hydroxide, modified wollastonite, calcium carbonate, zinc borate, melamine polyphosphate and dipentaerythritol into the shell of a mixing device, dehydrate and blend at a temperature of 110° C. to 120° C. and a vacuum degree of 0.085 to 0.099 MPa for 120 to 150 minutes to obtain a base material, and test the moisture content of the base material by Karl Fischer method. A moisture content of 800 ppm or less is considered acceptable. Step 2: The base material, water scavenger, adhesion promoter and catalyst obtained in step 1 are transported to the base material dispersion component, and the shearing and crushing dispersion component is driven at a speed of 5000-6000 rpm to finely disperse the materials. The materials are homogenized and dispersed by the high-pressure homogenizing dispersion component at a pressure of 10-15 MPa to obtain a completely dispersed base material; Step 3: The base material obtained in step 2 is vacuum degassed under the conditions of a vacuum degree of 0.085-0.099 MPa in the base material dispersion component and a rotation speed of 500-1000 rpm in the shearing and crushing dispersion component. During the sealant curing stage, the pressure in the base material dispersion component is adjusted to 2-10 MPa, and the high pressure is used to accelerate the cross-linking reaction of the silane coupling agent and the filler.

[0018] Compared with the prior art, the present invention has the following advantages: 1. The ceramic fire-resistant sealant used in this bridge is a colloid formed after vulcanization. It transforms into a self-supporting ceramic body under high temperature or open flame conditions, hindering the spread of flames into the material, thereby achieving the purpose of flame retardancy and fire prevention. At the same time, the mechanical properties do not show obvious attenuation before and after thermal aging, and it still maintains good elasticity. After vulcanization, the paint has excellent adhesion to it, ensuring its effectiveness. 2. The ceramic fire-resistant sealant used in this bridge has a flame retardancy of up to V~0, meeting the technical requirements for vulcanized rubber sealants in JT / T 694~2007, "Technical Conditions for Anticorrosion Coating of Main Cable Systems of Suspension Bridges," especially regarding thermal aging stability. The sealant surface is paintable and has excellent adhesion. 3. The ceramic fire-resistant sealant for the bridge is prepared by the improved preparation equipment. The raw materials are mixed by the raw material mixing device. During mixing, the materials are mixed and stirred by the stirring element. At the same time, the grinding roller grinds and crushes the solid particles in the material, so that the solid particles can be ground while the materials are mixed. The base material obtained by the raw material mixing device is dispersed by the base material dispersing device. The base material is refined by the coordinated cooperation of the shear crushing dispersing element and the high-pressure homogenizing dispersing element, and nano-level uniform dispersion is achieved, thereby effectively improving the density of the ceramic sealant. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 Schematic diagram of the formulation of the embodiment of the present invention and the comparative example; Figure 2 Schematic diagram of performance test results of sealants prepared using the formulations of the examples and comparative examples; Figure 3 This is a schematic diagram of a device for preparing a ceramic fire-resistant sealant for bridges according to one embodiment of the present invention; Figure 4 This is a perspective view of a device for preparing a ceramic fire-resistant sealant for bridges according to one embodiment of the present invention; Figure 5 This is a cross-sectional view of an apparatus for preparing a ceramic fire-resistant sealant for bridges according to one embodiment of the present invention; Figure 6 For the present invention Figure 5 Schematic diagram at A in the middle; Figure 7 This is a schematic diagram of some components of the raw material mixing assembly of the present invention; Figure 8 is a schematic diagram of some components of the dispersion assembly of the present invention; Figure 9 Schematic diagram of the fire protection structure of the present invention.

[0021] Description of main reference numerals: 1-Raw material mixing device, 11-Mixer housing, 12-First rotating shaft, 13-Stirring impeller, 14-First crushing blade, 15-Second crushing blade, 16-Power supply external connection, 17-First mounting plate, 18-Second mounting plate, 19-First grinding roller, 110-First scraper, 111-Third mounting plate, 112-Second grinding roller, 113-Second scraper, 114-First motor, 115-Feed assembly, 116-Discharge port, 2-Base material dispersion device, 21-Dispersion Device housing, 22-second rotating shaft, 23-first dispersion knife, 24-second dispersion knife, 25-second motor, 26-pressure pipe, 27-first nozzle, 28-high-pressure pump, 3-conveying and energy-saving components, 31-cooked conveying pump, 32-discharge pipe, 33-conveying pipe, 34-waste heat recovery pipe, 35-second nozzle, 4-flexible refractory insulation material layer, 5-refractory winding covering cloth layer, 6-mass transfer barrier layer, 7-ceramic fire-resistant sealant layer, 8-refractory winding covering cloth, 9-outer protective layer. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0023] A ceramic fire-resistant sealant for bridges in one embodiment of the present invention solves the problem that when a flame retardant is added to the sealant to make the sealant flame-retardant, the flame retardant will decompose in a high-temperature environment, causing the sealant to lose its flame-retardant properties and affecting the use effect of the sealant.

[0024] Specifically, the ceramic fire-resistant sealant for bridges includes components such as a MS polymer, a plasticizer, aluminum hydroxide, modified wollastonite, calcium carbonate, zinc borate, melamine polyphosphate, dipentaerythritol, a water scavenger, an adhesion promoter, and a catalyst. The MS polymer is selected from silane-modified polyethers or α-silane-modified polyurethanes. The silane-modified polyethers include at least one of S303H, SAX350, SAX580, and SAX750, and the α-silane-modified polyurethanes include at least one of STP-E10, STP-E30, and STP-E35. The plasticizer is selected from at least one of alkyl phenyl sulfonates and TCPP.

[0025] The particle size of aluminum hydroxide is 5000 mesh. Aluminum hydroxide is a high-temperature curing agent that can enhance the wear resistance, durability and tensile fracture resistance of the sealant. In addition, under high-temperature conditions, aluminum hydroxide decomposes when heated to release water vapor. The latent heat of evaporation of water reduces the combustion temperature and improves the thermal stability of the prepared sealant.

[0026] Modified wollastonite is silane-modified or zinc stearate-coated. Under high temperature conditions, the Si~O structure of the modified wollastonite will be transformed into a continuous, antioxidant, and insulating network of silica ash covering the surface, which not only prevents further ablation, but also provides a material basis for subsequent ceramicization and improves the strength and wear resistance of the prepared sealant.

[0027] Zinc borate is analytically pure and can improve the flame retardancy of the prepared sealant and reduce smoke generation during combustion. The dehumidifier is selected from at least one of p-toluenesulfonyl isocyanate and vinyltrimethoxysilane. The adhesion promoter is selected from at least one of KH550, KH560, KH570, and KH792. The catalyst is selected from an organotin catalyst, including at least one of U-220H and U-130, TIB 226, and DBTDL. U-220H and U-130 can be sourced from Kato Chemical Co., Ltd., Japan. The particle sizes of aluminum hydroxide, modified wollastonite, calcium carbonate, zinc borate, and melamine polyphosphate are identical.

[0028] The contents of the above components are: 100 parts of MS polymer; 0 parts to 100 parts of plasticizer; 80 parts to 150 parts of aluminum hydroxide; 80 parts to 150 parts of modified wollastonite; 50 parts to 100 parts of calcium carbonate; 10 parts to 20 parts of zinc borate; 10 parts to 20 parts of melamine polyphosphate; 5 parts to 10 parts of dipentaerythritol; 5 parts to 10 parts of dehydrating agent; 5 parts to 10 parts of adhesion promoter; 0.5 parts to 2 parts of catalyst; and melamine polyphosphate and dipentaerythritol are used in a ratio of 3:1.

[0029] Through the setting of aluminum hydroxide, modified wollastonite, calcium carbonate, zinc borate and melamine polyphosphate, the sealant produced by the above formula is transformed into a self-supporting ceramic body under high temperature or open flame conditions, hindering the flame from spreading into the interior of the material, thereby achieving the purpose of flame retardancy and fire prevention.

[0030] The present application is further described below through some embodiments and comparative examples of the present application.

[0031] In Examples 1 to 5, the production formula of ceramic fire-resistant sealant for bridges is as shown in the attached specification. Figure 1 As shown, the following production process is adopted and the combination of Examples 1 to 5 is used to produce ceramic fire-resistant sealant for bridges.

[0032] Comparative Example 1 This comparative example provides a sealant, the production formula of which is as shown in the attached specification. Figure 1 As shown, the sealant was prepared using the formulation of Comparative Example 1 and the above production process.

[0033] Comparative Example 2 This comparative example provides a sealant, the production formula of which is as shown in the attached specification. Figure 1 As shown, the sealant was prepared using the formulation of Comparative Example 2 and the above production process.

[0034] The performance tests of the sealants prepared in Examples 1 to 5 and the sealants prepared in Comparative Examples 1 and 2 were carried out. The test results are shown in the attached manual. Figure 2 shown.

[0035] Attached to the instruction manual Figure 2 It can be seen that the flame retardancy of the sealant prepared using the formula of the present application can reach V~0 level; it meets the technical requirements for vulcanized rubber sealants in JT / T694~2007 "Technical Conditions for Anti-corrosion Coating of Suspension Bridge Main Cable Systems", especially the stability of thermal aging. There is no obvious attenuation of mechanical properties before and after thermal aging, and it still maintains good elasticity; the elongation at break is enhanced; it has excellent bonding properties, and its surface can be sprayed with paint.

[0036] In summary, when the ceramic fire-resistant sealant for bridges is used, the vulcanized sealant has a flame retardant function. The rubber body formed after vulcanization is transformed into a self-supporting ceramic body under high temperature or open flame conditions, hindering the flame from spreading into the interior of the material, thereby achieving the purpose of flame retardancy and fire prevention. Not only can it be ceramicized under high temperature or open flame, but the paint has excellent adhesion to it after vulcanization, and there is no obvious attenuation of mechanical properties before and after thermal aging, and it still maintains good elasticity, making it easy to use.

[0037] A fireproof structure comprises, from the inside to the outside, a composite flexible fireproof heat-insulating material layer 4, a fireproof winding covering cloth layer 5, a mass transfer barrier layer 6 and a ceramic fireproof sealant layer 7.

[0038] Specifically, the flexible refractory thermal insulation material layer 4 uses aluminum silicate wool felt with a thickness of 25 to 30 mm, and then is wrapped with a refractory wrapping cloth layer 5, which is two layers of basalt fiber cloth. Then, a mass transfer barrier layer 6 is applied on the basalt fiber cloth. The mass transfer barrier layer 6 uses high-temperature resistant silicone sealant. The thickness of the silicone sealant is 3 mm. After the silicone sealant is cured, a layer of refractory wrapping cloth 8 is wrapped. The refractory wrapping cloth 8 is basalt fiber cloth. Then, ceramic fire-resistant sealant is applied as a ceramic fire-resistant sealant layer 7. The thickness of the ceramic fire-resistant sealant layer 7 is 3 mm. After the fire-resistant sealant is dried, the outer protective layer 9 is coated.

[0039] like Figures 3 to 5 As shown, a preparation device for ceramic fire-resistant sealant for bridges includes a raw material mixing device 1, a discharge port 2 and a conveying and energy-saving component 3.

[0040] like Figures 3 to 5 As shown, the raw material mixing device 1 includes a mixing device housing 11. A first rotating shaft 12 is rotatably connected to the center of the top and bottom wall panels of the mixing device housing 11. Multiple sets of stirring elements are installed at equal intervals on the side walls of the first rotating shaft 12, so that the first rotating shaft 12 drives the multiple stirring elements to stir and mix the raw materials added to the mixing device housing 11. The side walls of the first rotating shaft 12 are fixedly connected to a first mounting plate 17 and a second mounting plate 18. A first grinding roller 19 is rotatably connected between the first mounting plate 17 and the second mounting plate 18. A second grinding roller 112 is rotatably connected to the bottom of the second mounting plate 18. The first rotating shaft 12 drives the stirring elements to rotate, and simultaneously drives the first grinding roller 19 and the second grinding roller 112 to rotate. Therefore, the first grinding roller 19 and the second grinding roller 112 can grind and crush the solid raw materials in the mixing device housing 11, reducing the particle size of the particles by grinding, thereby ensuring more thorough mixing of the raw materials. A dehydration component is also installed in the mixing device housing 11 to complete dehydration and blending of the materials within the mixing device housing 11.

[0041] Preferably, the first mounting plate 17 and the first grinding roller 19 are both made of silicon carbide, and a wear-resistant layer is provided on the inner wall of the mixing device housing 11, so that the first mounting plate 17 and the first grinding roller 19 will not cause wear to the inner wall of the mixing device housing 11.

[0042] like Figure 4 and Figure 7 As shown, the stirring element includes a stirring impeller 13. Multiple stirring impellers 13 are fixedly connected to the sidewalls of the first rotating shaft 12 at equal intervals, so that rotation of the first rotating shaft 12 drives the multiple stirring impellers 13 to rotate. Multiple transversely arranged first crushing blades 14 and multiple longitudinally arranged second crushing blades 15 are fixedly connected to the front and rear sidewalls of the stirring impeller 13. Rotation of the stirring impeller 13 drives the first and second crushing blades 14, 15 to rotate. The first and second crushing blades 14, 15 break up particulate matter in the material, thereby achieving uniform mixing through stirring and crushing. A heating plate is installed within the stirring impeller 13. When the stirring impeller 13 stirs and mixes the material, the heating plate installed within the stirring impeller 13 heats the material. This ensures uniform heating of the material when heated by the heating plate, improving mixing efficiency. An external power supply cable 16 for supplying power to the heating plate is installed within the first rotating shaft 12. The external power supply cable 16 is connected to an external power source to power the heating plate installed within the stirring impeller 13. A first motor 114 is mounted on the first rotating shaft 12, driving the first rotating shaft 12 to rotate. A feed assembly 115 is mounted on the top wall of the mixing device housing 11. Raw materials are added to the mixing device housing 11 through this feed assembly 115 for mixing. A switching valve is provided on the feed assembly 115 to create a negative pressure within the mixing device housing 11. A discharge port 116 is provided on the bottom wall of the mixing device housing 11, through which the mixed materials within the mixing device housing 11 are discharged.

[0043] like Figure 4 and Figure 5As shown, the first grinding roller 19 abuts against the inner side wall of the mixing device housing 11, so that the solid particles located on the inner side wall of the mixing device housing 11 can be ground and crushed by the first grinding roller 19. A first scraper 110 is fixedly connected between the first mounting plate 17 and the second mounting plate 18. One end of the first scraper 110 abuts against the inner side wall of the mixing device housing 11. When the first mounting plate 17 and the second mounting plate 18 drive the first scraper 110 to rotate, the first scraper 110 can scrape off the material attached to the inner side wall of the mixing device housing 11. At the same time, the first scraper 110 and the first grinding roller 19 are arranged relative to each other, so that the material on the inner side wall of the mixing device housing 11 is ground by the first grinding roller 19 and then scraped off by the first scraper 110. A pair of third mounting plates 111 are fixedly connected to the bottom of the second mounting plate 18. A second grinding roller 112 is rotatably connected between the pair of third mounting plates 111. The second grinding roller 112 abuts against the inner sidewall of the bottom wall of the mixing device housing 11, thereby grinding and crushing solid particulate matter on the bottom sidewall of the mixing device housing 11 through the rotation of the first rotating shaft 12. A second scraper 113 is fixedly connected to the sidewall of the second mounting plate 18. One end of the second scraper 113 abuts against the inner sidewall of the bottom wall of the mixing device housing 11. The second scraper 113 and the second grinding roller 112 are arranged opposite each other, so that the second grinding roller 112 grinds the material at the bottom of the mixing device housing 11 and then the second scraper 113 scrapes it away.

[0044] Specifically, since the impeller 13 generates centrifugal force when stirring the material, the solid particles in the material will be brought to the inner wall and bottom of the mixing device shell 11 under the action of the centrifugal force. The solid particles located on the inner wall and bottom can be ground by the first grinding roller 19 and the second grinding roller 112, so that when the stirring element stirs the material, the first grinding roller 19 and the second grinding roller 112 can grind the material to ensure that the material is fully mixed.

[0045] like Figures 3 to 5As shown, the base material dispersion device 2 includes a base material dispersion assembly 21. A second rotating shaft 22 is rotatably connected to the center of the bottom wall of the base material dispersion assembly 21, allowing the second rotating shaft 22 to rotate within the base material dispersion assembly 21. Multiple sets of shearing and crushing dispersion elements are fixedly connected to the second rotating shaft 22. These elements are driven by the second rotating shaft 22 to rotate, further refining the material through liquid layer friction and shear forces. A high-pressure homogenizing disperser is installed within the base material dispersion assembly 21. This high-pressure homogenizing disperser provides high-pressure gas into the base material dispersion assembly 21, further refining the filler particles through high-pressure shear and cavitation effects. The high-pressure homogenizing disperser and the multiple groups of shearing and crushing dispersers are arranged in a relative manner. When the shearing and crushing dispersers are driven by the high-speed rotation of the second rotating shaft 22 to refine the material in the base material dispersion component 21, the centrifugal force generated by the shearing and crushing dispersers will drive the material to rotate, and then the high-pressure gas provided by the high-pressure homogenizing disperser acts on the material. Under the dual action of the shearing and crushing disperser and the high-pressure homogenizing disperser, the material can be refined to achieve nano-level uniform dispersion, thereby effectively improving the density of the ceramic sealant.

[0046] like Figure 5 、 Figure 6 and Figure 8 As shown, the shearing and crushing dispersion element includes a plurality of first dispersion knives 23, which are fixedly connected to the side wall of the second rotating shaft 22 at equal intervals. The first dispersion knife 23 at the bottom is arranged horizontally, and a plurality of second dispersion knives 24 are fixedly connected to the upper and lower side walls of the first dispersion knife 23 at the bottom and the upper side wall of the first dispersion knife 23 at the top. The first dispersion knives 23 on the multiple groups of shearing and crushing dispersion elements are inclined from bottom to bottom in a manner in which the inclination gradually increases. A second motor 25 is installed at the lower end of the second rotating shaft 22. The high-pressure homogenizing dispersion element includes a pressure pipe 26, which is fixedly connected to the side wall of the base material dispersion component 21 in a through manner. The pressure pipe 26 is placed in the base material dispersion component 21 and a vertical pipe is provided directly above the second rotating shaft 22. A plurality of first nozzles 27 are opened on the side wall of the vertical pipe of the pressure pipe 26 in a downward inclined manner. A high-pressure pump 28 is installed at one end of the pressure pipe 26 located outside the base material dispersion component 21.

[0047] Specifically, when the second motor 25 drives the second rotating shaft 22 to rotate at high speed, the second rotating shaft 22 can drive the multiple first dispersing blades 23 to rotate at high speed, so that the high-speed rotation of the first dispersing blades 23 can further refine the material through liquid layer friction and shear force. In addition, the first dispersing blades 23 in different layers are set at different inclinations, and the inclination is set in a manner that gradually increases from the bottom layer to the top layer, so that the first dispersing blades 23 have a better effect of refining the material in the base material dispersing assembly 21. At the same time, when the multiple first dispersing blades 23 rotate at high speed, they can generate centrifugal force on the material, thereby driving the material to rotate, so that the material is dispersed and crushed, and at the same time, heat is generated, which increases the temperature of the material to promote the mixing of the material. At the same time, the high-pressure gas generated by the high-pressure pump 28 is transported to the base material dispersion component 21 through the pressure pipe 26, and then sprayed out through multiple downwardly inclined first nozzles 27, so that the high-pressure gas sprayed by the first nozzle 27 acts on the material moved upward by the first dispersion knife 23. The high-pressure gas presses the material so that the high-pressure gas disperses the material homogeneously and presses it at the first dispersion knife 23 at the same time, so as to fully shear and crush the material. Therefore, through the cooperation of the high-pressure gas and the first dispersion knife 23, the material is evenly dispersed at the nanometer level, thereby effectively improving the density of the ceramic sealant.

[0048] Furthermore, the high-pressure gas ejected from the first nozzle 27 will act on the side wall of the first dispersing knife 23 on the inner wall of the mixing device shell 11. Through the flushing of the high-pressure gas, the adhesion of highly viscous materials is avoided, thereby effectively avoiding the adhesion of materials to the components in the base material dispersing component 21, making it easy to clean the materials.

[0049] like Figures 3 to 5 As shown, the conveying and energy-saving component 3 includes a material conveying component and a waste heat recovery component. The material conveying component is used to convey the mixed material in the mixing device shell 11 to the base material dispersion component 21, and the heat recovery component is used to recover the waste heat in the base material dispersion component 21 and the heat generated by the rotating equipment to the mixing device shell 11 for use, thereby realizing the recovery and utilization of waste heat and avoiding heat waste.

[0050] like Figures 3 to 5As shown, the material delivery assembly includes a delivery pump 31, and a discharge pipe 32 is installed at the feed port of the delivery pump 31. The end of the discharge pipe 32 away from the delivery pump 31 is fixedly connected to the bottom of the discharge port 116. A delivery pipe 33 is installed on the discharge port of the delivery pump 31. The end of the delivery pipe 33 away from the delivery pump 31 is installed in a penetrating manner on the side wall of the mixing device housing 11, so that the mixed materials in the mixing device housing 11 are delivered to the base material dispersion assembly 21 through the delivery pump 31. The waste heat assembly includes a waste heat recovery pipe 34, which is installed on the bottom wall panel of the base material dispersion assembly 21. A second nozzle 35 is installed in an inclined manner on the top wall panel of the mixing device housing 11 at the feed assembly 115. The end of the waste heat recovery pipe 34 away from the base material dispersion assembly 21 is installed on the second nozzle 35. Because the material within the base material dispersing assembly 21 generates a large amount of heat due to high-speed centrifugal rotation, in order to achieve heat recovery and utilization, the heat generated within the base material dispersing assembly 21 is transported through the waste heat recovery pipe 34 and then sprayed to the bottom of the feed assembly 115 through the second nozzle 35. This heat is recovered to preheat the material added to the mixing device housing 11, thereby improving the mixing effect of the materials within the mixing device housing 11 and realizing the recovery and utilization of the waste heat within the base material dispersing assembly 21. The waste heat recovery pipe 34 is provided with an on / off valve for easy control.

[0051] It should be noted that in order to facilitate the intelligent operation of the present invention, it is equipped with necessary sensors and electrical components. The necessary sensors and electrical components can be used in conjunction with a single-chip microcomputer or other control equipment to achieve automatic or semi-automatic control of the present invention. This is well known to those skilled in the art and will not be described in detail here.

[0052] Secondly, in order to ensure the safe use of the equipment under high pressure, relevant components are made of high-pressure resistant materials, and the equipment has good sealing performance.

[0053] A method for preparing a ceramic fire-resistant sealant for bridges, the method comprising: Step 1: Add MS polymer, plasticizer, aluminum hydroxide, modified wollastonite, calcium carbonate, zinc borate, melamine polyphosphate and dipentaerythritol into the mixing device shell 11, dehydrate and blend at a temperature of 110°C to 120°C and a vacuum degree of 0.085 to 0.099 MPa for 120 to 150 minutes to obtain a base material. The moisture content of the base material is tested by the Karl Fischer method. A moisture content of 800 ppm or less is qualified.

[0054] Specifically, MS polymer, plasticizer, aluminum hydroxide, modified wollastonite, calcium carbonate, zinc borate, melamine polyphosphate and dipentaerythritol are added into the mixing device housing 11 through the feeding component 115, and the first rotating shaft 12 is driven to rotate by the first motor 114. When the first rotating shaft 12 rotates, it can drive multiple stirring impellers 13, the first grinding roller 19 and the second grinding roller 112 to rotate. When the multiple stirring impellers 13 rotate, the materials are stirred and mixed. At the same time, the first crushing blade 14 and the second crushing blade 14 on the stirring impeller 13 are driven to rotate. The second crushing knife 15 will crush the material; when the stirring impeller 13 stirs the material, it will cause the material to rotate under the action of centrifugal force, and the solid particles in the material will be brought to the inner side wall and bottom side wall of the mixing device shell 11. The rotation of the first grinding roller 19 and the second grinding roller 112 can grind and crush the solid particles located on the inner side wall and bottom side wall of the mixing device shell 11, so that the solid particles are crushed and dissolved into other materials to obtain a base material, thereby greatly improving the efficiency of mixing the raw materials.

[0055] Step 2: The base material, dehydrating agent, adhesion promoter and catalyst obtained in step 1 are transported to the base material dispersion component 21, and the shearing and crushing dispersion components are driven at a rotation speed of 5000~6000rpm to finely disperse the materials. The materials are homogenized and dispersed by the high-pressure homogenizing dispersion components at a pressure of 10~15MPa to obtain a completely dispersed base material.

[0056] Specifically, the base material mixed in the mixing device housing 11 is transported to the delivery pump 31 through the discharge pipe 32, and then transported to the base material dispersion component 21 through the delivery pipe 33 after being squeezed by the delivery pump 31. In the base material dispersion component 21, the base material transported to the base material dispersion component 21 through the delivery pipe 33 is brought to the first dispersion knife 23 by the centrifugal force due to the high-speed rotation of the first dispersion knife 23. At the same time, the high-pressure gas generated by the high-pressure pump 28 is transported to the base material dispersion component 21 through the pressure pipe 26. The high-pressure gas ejected from the first nozzle 27 acts on the material so as to refine the material under the dual action of the shearing and crushing dispersion component and the high-pressure homogenizing dispersion component to achieve nano-level uniform dispersion, thereby effectively improving the density of the ceramic sealant. At the same time, the high-pressure gas acts on the first dispersing knife 23 and the side wall of the mixing device shell 11, avoiding the high-viscosity material from adhering to the first dispersing knife 23 and the inner wall of the mixing device shell 11, making it easy to clean the material obtained in the base material dispersing component 21.

[0057] Step 3: Vacuum degas the base material obtained in step 2 under the conditions of a vacuum degree of 0.085-0.099 MPa in the base material dispersion component 21 and a rotation speed of 500-1000 rpm for the shear crushing dispersion component. During the sealant curing stage, the pressure in the base material dispersion component 21 is adjusted to 2-10 MPa, and high pressure is used to accelerate the cross-linking reaction between the silane coupling agent and the filler. Since the material will produce microbubbles during the high-pressure homogenization process, the microbubbles generated during the high-pressure homogenization process are eliminated by vacuum means to avoid internal defects after ceramicization. Applying pressure during the sealant curing stage uses high pressure to accelerate the cross-linking reaction between the silane coupling agent and the filler, shortening the curing time by 30%-50%.

[0058] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0059] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A ceramic fire-resistant sealant for bridges, characterized in that: The components of the ceramic fire-resistant sealant for bridges include MS polymer, plasticizer, aluminum hydroxide, modified wollastonite, calcium carbonate, zinc borate, melamine polyphosphate, dipentaerythritol, water scavenger, adhesion promoter and catalyst; The contents of the above components are: 100 parts of MS polymer; 0 to 100 parts of plasticizer; 80 to 150 parts of aluminum hydroxide; 80~150 parts of modified wollastonite; 50~100 parts of calcium carbonate; 10-20 parts of zinc borate; 10-20 parts of melamine polyphosphate; 5-10 parts of dipentaerythritol; 5~10 parts of dewatering agent; 5~10 parts of adhesion promoter; 0.5~2 parts of catalyst; The melamine polyphosphate and dipentaerythritol are used in a ratio of 3:

1.

2. The ceramic fire-resistant sealant for bridges according to claim 1, characterized in that: The MS polymer is selected from silane-modified polyether or α-silane-modified polyurethane, the silane-modified polyether includes at least one of S303H, SAX350, SAX580, and SAX750, the α-silane-modified polyurethane includes at least one of STP~E10, STP~E30, and STP~E35, the plasticizer is selected from at least one of alkyl phenyl sulfonate and TCPP, the particle size of the aluminum hydroxide is 5000 mesh; and the modified wollastonite is silane-modified or zinc stearate-coated.

3. The ceramic fire-resistant sealant for bridges according to claim 1, characterized in that: The zinc borate is of analytical grade, the dehydrating agent is selected from at least one of p-toluenesulfonyl isocyanate and vinyltrimethoxysilane, the adhesion promoter is selected from at least one of KH550, KH560, KH570, and KH792, and the catalyst is selected from an organic tin catalyst, including at least one of U-220H, U-130, TIB 226, and DBTDL.

4. A fireproof structure comprising a ceramic fireproof sealant for bridges according to any one of claims 1 to 3, characterized in that: The fireproof structure comprises, from the inside to the outside, a composite flexible fireproof heat-insulating material layer, a fireproof winding covering cloth layer, a mass transfer barrier layer and a ceramic fireproof sealing adhesive layer.

5. A preparation device for a ceramic fire-resistant sealant for bridges, used for preparing a ceramic fire-resistant sealant for bridges as claimed in any one of claims 1 to 3, characterized in that: The preparation equipment includes: A raw material mixing device includes a mixing device housing, wherein a first rotating shaft is rotatably connected at the center of the top wall plate and the bottom wall plate of the mixing device housing, a plurality of stirring members are installed on the side wall of the first rotating shaft at equal intervals, a first mounting plate and a second mounting plate are fixedly connected to the side wall of the first rotating shaft, a first grinding roller is rotatably connected between the first mounting plate and the second mounting plate, and a second grinding roller is rotatably connected to the bottom of the second mounting plate; The base material dispersing device includes a base material dispersing assembly, wherein a second rotating shaft is rotatably connected to the center of the bottom wall plate of the base material dispersing assembly, and a plurality of shearing and crushing dispersing members are fixedly connected to the second rotating shaft. A high-pressure homogenizing dispersing member is provided in the base material dispersing assembly, and the high-pressure homogenizing dispersing member and the plurality of shearing and crushing dispersing members are arranged in an opposing manner; The conveying and energy-saving component includes a material conveying component and a waste heat recovery component. The material conveying component is used to convey the mixed materials in the mixing device shell to the base material dispersion component. The heat recovery component is used to recover the waste heat in the base material dispersion component and the heat generated by the rotating equipment to the mixing device shell for use.

6. The preparation equipment of a ceramic fire-resistant sealant for bridges according to claim 5, characterized in that: The stirring member includes a stirring impeller, and a plurality of the stirring impellers are fixedly connected to the side wall of the first rotating shaft in an equidistant manner. A plurality of first crushing knives arranged laterally and a plurality of second crushing knives arranged longitudinally are fixedly connected to the front and rear side walls of the stirring impeller. A heating plate is installed in the stirring impeller, an external power supply connection for supplying power to the heating plate is installed in the first rotating shaft, a first motor is installed on the first rotating shaft, a feeding assembly is installed on the top wall panel of the mixing device shell, and a discharge port is opened on the bottom wall panel of the mixing device shell.

7. The equipment for preparing ceramic fire-resistant sealant for bridges according to claim 6, characterized in that: The first grinding roller abuts against the inner side wall of the mixing device housing, a first scraper is fixedly connected between the first mounting plate and the second mounting plate, one end of the first scraper abuts against the inner side wall of the mixing device housing, a pair of third mounting plates are fixedly connected to the bottom of the second mounting plate, a second grinding roller is rotatably connected between the pair of third mounting plates, the second grinding roller abuts against the inner side wall of the bottom wall plate of the mixing device housing, a second scraper is fixedly connected to the side wall of the second mounting plate, and one end of the second scraper abuts against the inner side wall of the bottom wall plate of the mixing device housing.

8. The equipment for preparing ceramic fire-resistant sealant for bridges according to claim 7, characterized in that: The shearing and crushing dispersion component includes a plurality of first dispersion knives, which are fixedly connected to the side walls of the second rotating shaft at equal intervals. The first dispersion knife at the bottom is arranged in a horizontal manner. A plurality of second dispersion knives are fixedly connected to the upper and lower side walls of the first dispersion knife at the bottom and the upper side wall of the first dispersion knife at the top. The first dispersion knives on multiple groups of shearing and crushing dispersion components are inclined from bottom to bottom in a manner in which the inclination gradually increases. A second motor is installed at the lower end of the second rotating shaft. The high-pressure homogenizing dispersion component includes a pressure pipe, which is fixedly connected to the side wall of the base material dispersion component in a through-going manner. The pressure pipe is placed in the base material dispersion component and a vertical pipe is provided directly above the second rotating shaft. A plurality of first nozzles are opened on the side wall of the vertical pipe of the pressure pipe in a downwardly inclined manner. A high-pressure pump is installed at one end of the pressure pipe located outside the base material dispersion component.

9. The equipment for preparing ceramic fire-resistant sealant for bridges according to claim 8, characterized in that: The feeding assembly includes a feeding pump, and a discharge pipe is installed at the feeding port of the feeding pump, and the end of the discharge pipe away from the feeding pump is fixedly connected to the bottom of the discharge port. The feeding port of the feeding pump is installed with a feeding pipe, and the end of the feeding pipe away from the feeding pump is installed on the side wall of the mixing device shell in a penetrating manner. The waste heat assembly includes a waste heat recovery pipe, and the waste heat recovery pipe is installed on the bottom wall panel of the base material dispersion assembly. The top wall panel of the mixing device shell is installed with a second nozzle in an inclined manner at the feeding assembly, and the end of the waste heat recovery pipe away from the base material dispersion assembly is installed on the second nozzle.

10. A method for preparing a ceramic fire-resistant sealant for bridges, using the equipment for preparing a ceramic fire-resistant sealant for bridges as claimed in any one of claims 5 to 9, characterized in that: The preparation method comprises: Step 1: Add MS polymer, plasticizer, aluminum hydroxide, modified wollastonite, calcium carbonate, zinc borate, melamine polyphosphate and dipentaerythritol into the shell of a mixing device, dehydrate and blend at a temperature of 110° C. to 120° C. and a vacuum degree of 0.085 to 0.099 MPa for 120 to 150 minutes to obtain a base material, and test the moisture content of the base material by Karl Fischer method. A moisture content of 800 ppm or less is considered acceptable. Step 2: The base material, water scavenger, adhesion promoter and catalyst obtained in step 1 are transported to the base material dispersion component, and the shearing and crushing dispersion component is driven at a speed of 5000-6000 rpm to finely disperse the materials. The materials are homogenized and dispersed by the high-pressure homogenizing dispersion component at a pressure of 10-15 MPa to obtain a completely dispersed base material; Step 3: The base material obtained in step 2 is vacuum degassed under the conditions of a vacuum degree of 0.085-0.099 MPa in the base material dispersion component and a rotation speed of 500-1000 rpm in the shearing and crushing dispersion component. During the sealant curing stage, the pressure in the base material dispersion component is adjusted to 2-10 MPa, and the high pressure is used to accelerate the cross-linking reaction of the silane coupling agent and the filler.

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