Corrosion-resistant flame-retardant composite sealant for bridge cable, preparation equipment and application of corrosion-resistant flame-retardant composite sealant

Abstract

The invention discloses an anti-corrosion and flame-retardant composite sealant for a bridge cable, preparation equipment and application of the anti-corrosion and flame-retardant composite sealant for the bridge cable. The corrosion-resistant flame-retardant composite sealant comprises the following components in parts by weight: 100 parts of MS (Murashige and Skoog) polymer, 100 parts of plasticizer, 100 parts of aluminum hydroxide, 100 parts of magnesium hydroxide, 100 parts of fumed silica, 100 parts of rheological additive, 100 parts of stabilizer, 100 parts of moisture scavenger, 100 parts of adhesion promoter and 100 parts of catalyst. 30 to 100 parts of a plasticizer; 100 to 300 parts of aluminum hydroxide; 100 to 300 parts of magnesium hydroxide; 10 to 20 parts of fumed silica; 10 to 20 parts of a rheological additive; 5-10 parts of a stabilizer; 5 to 10 parts of a dewatering agent; 5 to 10 parts of an adhesion promoter; and 0.5 to 2 parts of a catalyst. The anti-corrosion and flame-retardant composite sealant for the bridge cable has excellent flame-retardant performance, and the flame-retardant performance can reach the V-0 level; the mechanical property is not obviously attenuated before and after thermal aging, and good elasticity is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge cable sealants, and in particular relates to an anti-corrosion and flame-retardant composite sealant for bridge cables, a preparation device and an application thereof. Background Art

[0002] Sealant is a sealing material that deforms with the shape of the sealing surface, resists flow, and exhibits a certain degree of adhesion. It is used to fill gaps in structures and provide a seal. It plays an important role in various fields, including construction, assembly, and transportation. In cable-type bridges, cables are important load-bearing components, and sealing and corrosion protection of their lower anchorage areas is a key component of cable structural design. Sealant sealing technology is currently being used on finished cables to prevent rusting of the cable anchorages in the lower anchorage areas due to water ingress.

[0003] Prior art sealants used to seal bridge cables are mostly made of vulcanized rubber, a combustible material that can burn and spread flames under certain conditions. To address this issue, prior art has proposed adding flame retardants to rubber to impart flame retardancy. Halogenated flame retardants (particularly brominated flame retardants) are widely used due to their low dosage, high flame retardancy, and wide adaptability. Furthermore, these halogenated flame retardants do not significantly degrade the physical, mechanical, and electrical properties of the substrate. They are available in a wide variety of varieties, offer a high cost-effectiveness, and are readily available.

[0004] However, when halogen-containing flame retardants burn, they generate a large amount of smoke and toxic and corrosive gases, which can cause cable corrosion and environmental pollution, and generate toxic gases that are extremely harmful to the human body. Adding halogen-containing flame retardants to rubber does not prevent the influence of oxygen on the rubber. Before and after thermal aging of the rubber, the elasticity of the rubber deteriorates, further affecting the sealing of the bridge cable; and the cable system is in a long-term vibration state due to the influence of temperature, wind load, vehicle load, etc., and the rubber with deteriorated elasticity is prone to cracking, affecting its anti-corrosion performance. At the same time, most of the sealant preparation equipment in the existing technology needs to be shut down before adding raw materials when raw materials need to be added. This not only makes the adding process cumbersome and complicated, but also the vacuum degree, temperature and other factors during the shutdown process will have an adverse effect on the raw materials in the preparation equipment, resulting in poor sealant processing quality.

[0005] 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

[0006] The purpose of the present invention is to provide a bridge cable anti-corrosion flame-retardant composite sealant, preparation equipment and application thereof, which can reduce the adverse effects of oxygen and thermal aging on the performance of the sealant and improve the elasticity, anti-aging and anti-corrosion properties of the sealant.

[0007] To achieve the above-mentioned object, a specific embodiment of the present invention provides a technical solution as follows: an anti-corrosion and flame-retardant composite sealant for bridge cables, the anti-corrosion and flame-retardant composite sealant comprising the following components: MS polymer, plasticizer, aluminum hydroxide, magnesium hydroxide, fumed silica, rheological additive, stabilizer, water scavenger, adhesion promoter, and catalyst; The contents of the above components are as follows: MS polymer: 100 parts; plasticizer: 30-100 parts; aluminum hydroxide: 100-300 parts; magnesium hydroxide: 100-300 parts; fumed silica: 10-20 parts; rheological additive: 10-20 parts; stabilizer: 5-10 parts; water scavenger: 5-10 parts; adhesion promoter: 5-10 parts; catalyst: 0.5-2 parts; The MS polymer includes silane-modified polyether and α-silane-modified polyurethane; The fumed silica, aluminum hydroxide and magnesium hydroxide are all in microparticle form, and the particle sizes of the aluminum hydroxide and magnesium hydroxide are the same.

[0008] In one or more embodiments of the present invention, the silane-modified polyether is at least one of S303H, SAX350, SAX580, and SAX750, the α-silane-modified polyurethane is at least one of STP-E10, STP-E30, and STP-E35, and the plasticizer is selected from at least one of alkyl phenyl sulfonate, polyether polyol, and DINP.

[0009] In one or more embodiments of the present invention, the particle size of both the aluminum hydroxide and the magnesium hydroxide is 5000 mesh, the content of the aluminum hydroxide is not less than that of the magnesium hydroxide, the fumed silica is AEROSIL R974, and the stabilizer is a hindered amine light stabilizer.

[0010] In one or more embodiments of the present invention, the rheological additive is selected from at least one of polyamide wax, hydrogenated castor oil, and polyurea; the water scavenger 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 at least one of an organic tin catalyst, U-220H and U-130, TIB 226, and DBTDL.

[0011] A preparation device for anti-corrosion and flame-retardant composite sealant for bridge cables, comprising: a dispersion kettle, a kettle cover, a split feeding mechanism and a self-excited screening and filtering mechanism, wherein the dispersion kettle is buckled and assembled with a kettle cover on the top, and the dispersion kettle and the kettle cover cooperate to form a closed kettle body, the split feeding mechanism is fixedly assembled on the top of the kettle cover, the split feeding mechanism comprises a screening material guide cylinder, the material outlet of the screening material guide cylinder is connected to the material inlet of the kettle cover, a driving shaft is rotatably connected in the screening material guide cylinder, and a feeding augers is fixedly sleeved on the side of the driving shaft close to the kettle cover, and the feeding augers are connected to the screening material guide cylinder. The material guide barrel is arranged in a coordinated manner, and a pneumatic isolation unit is installed on the side of the driving shaft close to the kettle cover. The self-excited screening and filtering mechanism is installed in the screening material guide barrel. The self-excited screening and filtering mechanism includes a lower screening net, and the lower screening net is fixedly connected to the inner wall of the screening material guide barrel, and the lower screening net is sleeved on the outside of the driving shaft. A fixed ring is arranged above the lower screening net, and the fixed ring is fixedly sleeved on the outside of the driving shaft, and multiple groups of evenly distributed flipping plates are fixedly connected to the outside of the fixed ring, and a self-excited screening unit is arranged between the flipping plate and the lower screening net.

[0012] In one or more embodiments of the present invention, a cylinder cover is fixedly mounted above the screening material guide cylinder. The cylinder cover and the screening material guide cylinder cooperate to form a closed feeding cylinder. The closed feeding cylinder temporarily stores the raw materials to be added. A drive motor is fixedly mounted on the side of the cylinder cover facing away from the screening material guide cylinder. The output shaft of the drive motor is drivingly connected to the drive shaft. The drive motor provides power and rotates the drive shaft by controlling the operation of the drive motor.

[0013] In one or more embodiments of the present invention, a feeding pipe is fixedly connected to one side of the screening material guide cylinder and is arranged above the turning plate. Raw materials to be added are added to the screening material guide cylinder through the feeding pipe. A sealing block is threadedly connected to the inner surface of the feeding pipe. The sealing block seals the feeding pipe. A disassembly handle is fixedly connected to one end of the sealing block, which is located outside the feeding pipe. The sealing block can be conveniently disassembled and assembled by rotating the disassembly handle.

[0014] In one or more embodiments of the present invention, the screening material guide cylinder is composed of a cylinder body and a material guide cylinder body. The bottom of the inner wall of the cylinder body is arranged in an inverted trapezoidal shape. This facilitates the flow of raw materials in the screening material guide cylinder from top to bottom along the inner wall of the cylinder body. The cylinder body is connected to the feed port of the kettle cover, and a pair of discharge plates are fixedly mounted on the outer side of the drive shaft. The discharge plates are arranged in conjunction with the cylinder body. The discharge plates rotate in the screening material guide cylinder as the drive shaft rotates, thereby agitating the raw materials accumulated below the cylinder body, facilitating the transportation of raw materials at the bottom of the cylinder body into the material guide cylinder body, thereby preventing the accumulation of raw materials at the bottom of the cylinder body.

[0015] In one or more embodiments of the present invention, the pneumatic isolation unit includes a closed partition block, which is slidably assembled in the feed port of the kettle cover. The feed port is sealed and protected by the cooperation of the closed partition block and the feed port of the kettle cover, thereby achieving spatial isolation between the kettle cover and the screening guide barrel, and avoiding the influence of the external environment on the vacuum and temperature in the dispersion kettle when adding raw materials to the screening guide barrel. A sealing ring is provided on the outer side of the closed partition block. The sealing ring is provided to ensure that the closed partition block seals the air inlet of the kettle cover. A movable connecting rod is fixedly connected to the side of the closed partition block close to the drive shaft. The movable connecting rod supports, fixes and drives the closed partition block.

[0016] An application of a corrosion-resistant and flame-retardant composite sealant for bridge cables, comprising a cable body, wherein the outer side of the cable body is wrapped with a buffer wrapping layer, and the outer side of the buffer wrapping layer is provided with a flame-retardant and fire-proofing mechanism, wherein the flame-retardant and fire-proofing mechanism consists of a fire-resistant wrapping layer and a flame-retardant sealant layer, wherein the flame-retardant sealant layer is provided on the outer side of the buffer wrapping layer, and an insulating medium is filled between the flame-retardant sealant layer and the buffer wrapping layer, and the fire-resistant wrapping layer is coated on the outer side of the flame-retardant sealant layer.

[0017] Compared with the existing technology, the anti-corrosion and flame-retardant composite sealant disclosed in the present invention has excellent flame retardant properties, with flame retardant properties reaching V-0 level. It meets the technical requirements for vulcanized rubber sealants in JT / T 694-2007 "Technical Conditions for Anti-corrosion Coating of Main Cable Systems of Suspension Bridges", and has no significant mechanical property degradation before and after thermal aging, while still maintaining good elasticity. The sealant surface can be painted and has excellent adhesion. At the same time, the anti-corrosion and flame-retardant composite sealant contains a large amount of aluminum hydroxide, which can react with oxygen atoms to form a dense oxide film on the surface of the sealant, which can prevent oxygen from entering the rubber and avoid corrosion of the sealant by oxygen, acid and alkali substances, greatly improving the anti-corrosion performance of the sealant, reducing the aging speed of the sealant, and extending the service life of the sealant. In addition, the addition of aluminum hydroxide makes the sealant have good flame retardant properties. In addition, by setting up a split feeding mechanism and a self-oscillating screening and filtering mechanism, the raw materials of the anti-corrosion and flame-retardant composite sealant can be added according to actual needs during the preparation process, which greatly reduces the adverse effects of shutdown during the feeding process and environmental factors on the preparation of the sealant, and improves the preparation quality of the sealant. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] 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 of the present invention; Figure 3 A perspective view of an apparatus for preparing a corrosion-resistant and flame-retardant composite sealant for bridge cables according to an embodiment of the present invention; Figure 4 for Figure 3 Schematic diagram of the structure at A in the middle; Figure 5 A partial structural cross-sectional view of an apparatus for preparing a corrosion-resistant and flame-retardant composite sealant for bridge cables according to an embodiment of the present invention; Figure 6 for Figure 5 Schematic diagram of the structure at B in the middle; Figure 7 for Figure 5 Schematic diagram of the structure at C in the middle; Figure 8 for Figure 5 Schematic diagram of the structure at D in the middle; Figure 9 for Figure 5 Schematic diagram of the structure at E in the middle; Figure 10 This is a partial structural diagram of an apparatus for preparing a corrosion-resistant and flame-retardant composite sealant for bridge cables according to one embodiment of the present invention; Figure 11 This is a schematic diagram of the application of the anti-corrosion and flame-retardant composite sealant for bridge cables in one embodiment of the present invention.

[0020] Description of main reference numerals: 1-dispersion kettle, 101-kettle cover, 2-split feeding mechanism, 201-screening guide cylinder, 2011-cylinder, 2012-guide cylinder, 202-driving shaft, 203-feeding auger, 204-cylinder cover, 205-driving motor, 206-feeding pipe, 207-blocking block, 208-disassembly handle, 209-discharge plate, 210-closed partition block, 211-sealing ring, 212-movable connecting rod, 213-tension spring, 214-air guide baffle, 215-delivery air duct, 216-inner flow channel , 3-self-excited screening and filtering mechanism, 301-lower screening net, 302-fixed collar, 303-turning plate, 304-self-excited upper screen, 305-fixed gear ring, 306-moving gear ring, 307-elastic protective sleeve, 308-limiting sealing ring, 309-reset spring, 310-first one-way exhaust valve, 311-second one-way exhaust valve, 312-one-way air intake valve, 4-cable body, 5-buffer wrapping layer, 6-flame retardant and fireproof mechanism, 601-fire-resistant winding layer, 602-flame retardant sealant layer, 7-thermal insulation medium. DETAILED DESCRIPTION

[0021] 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.

[0022] like Figures 1 to 2 As shown, the present invention discloses a bridge cable anti-corrosion and flame-retardant composite sealant, which comprises the following components: MS polymer, plasticizer, aluminum hydroxide, magnesium hydroxide, fumed silica, rheological additive, stabilizer, desiccant, adhesion promoter and catalyst.

[0023] Specifically, the contents of the above components are: MS polymer: 100 parts; plasticizer: 30-100 parts; aluminum hydroxide: 100-300 parts; magnesium hydroxide: 100-300 parts; fumed silica: 10-20 parts; rheological additive: 10-20 parts; stabilizer: 5-10 parts; dehydrating agent: 5-10 parts; adhesion promoter: 5-10 parts; catalyst: 0.5-2 parts.

[0024] The MS polymer includes silane-modified polyether and α-silane-modified polyurethane. The silane-modified polyether is at least one of S303H, SAX350, SAX580, and SAX750, and the α-silane-modified polyurethane is at least one of STP-E10, STP-E30, and STP-E35. The inclusion of the MS polymer enhances crosslinking between the sealant components, ensuring the sealant's mechanical and electrical properties.

[0025] Specifically, the fumed silica, aluminum hydroxide, and magnesium hydroxide are all in a microparticle form, and the particle sizes of the aluminum hydroxide and the magnesium hydroxide are the same.

[0026] Preferably, the particle size of both aluminum hydroxide and magnesium hydroxide is 5000 mesh, and the aluminum hydroxide content in the sealant is no less than that of magnesium hydroxide. The inclusion of magnesium hydroxide and aluminum hydroxide improves the sealant's flame retardancy. Furthermore, aluminum hydroxide reacts with oxygen atoms to form a dense oxide film on the sealant's surface, preventing oxygen from entering the rubber interior and corroding the sealant with oxygen, acids, and bases. This reduces sealant aging and extends its service life. The fumed silica is AEROSIL R974.

[0027] The plasticizer is selected from at least one of alkyl phenyl sulfonate (Mesamoll, Lanxess, Germany), polyether polyols PPG2000, PPG4000, and DINP.

[0028] Preferably, the stabilizer is a hindered amine light stabilizer, and the stabilizer can be selected from Tianjin Lianlong B7705. By setting the stabilizer, the anti-corrosion performance of the prepared sealant can be improved and the impact of ultraviolet rays in sunlight on the sealant can be reduced.

[0029] Specifically, the rheological additive is selected from at least one of polyamide wax, hydrogenated castor oil, and polyurea, preferably hydrogenated castor oil and Hemmings R powder.

[0030] Specifically, the dehydrating agent is selected from at least one of p-toluenesulfonyl isocyanate and vinyltrimethoxysilane.

[0031] Specifically, the adhesion promoter is selected from at least one of KH550, KH560, KH570, and KH792.

[0032] Specifically, the catalyst is selected from at least one of an organic tin catalyst, U-220H and U-130, TIB's 226, and DBTDL; U-220H and U-130 can be selected from Nitto Kasei's U-220H and U-130.

[0033] The present application is further described below through some embodiments of the present application: like Figure 1 As shown, the sealant was prepared using the following preparation process and the formulas of Examples 1 to 5.

[0034] In Examples 1 to 5, a method for preparing a bridge cable anticorrosion and flame retardant composite sealant comprises the following steps: Step 1: Add the above-mentioned MS polymer, plasticizer, aluminum hydroxide, magnesium hydroxide, fumed silica, rheological additive, and stabilizer into a vacuum disperser, dehydrate and blend for 120-150 minutes at a temperature of 110°C-120°C and a vacuum degree of 0.085-0.099 MPa to obtain a base material. The moisture content of the base material is tested by the Karl Fischer method. The moisture content is ≤800ppm, which is qualified. The base material is cooled to room temperature under nitrogen protection.

[0035] Step 2: Add the base material and dehydrating agent obtained in step 1 into a double planetary mixer at room temperature, and stir for 15-20 minutes at a vacuum degree of 0.085-0.099 MPa and a rotation speed of 20-25 Hz to further dehydrate the base material.

[0036] Step 3: Add the adhesion promoter and catalyst to the base material in step 2 at room temperature, and stir for 20-30 minutes at a vacuum degree of 0.085-0.099 MPa and a rotation speed of 30-35 Hz to prepare a sealant.

[0037] Comparative Example 1 The present comparative example provides an anti-corrosion and flame-retardant composite sealant, the raw material components of which are basically the same as those of Example 1, except that the comparative example does not contain strong aluminum oxide and magnesium hydroxide, and the comparative example 1 is prepared using the above-mentioned preparation process of the anti-corrosion and flame-retardant composite sealant for bridge cables.

[0038] Comparative Example 2 The present comparative example provides an anti-corrosion and flame-retardant composite sealant, the raw material components of which are basically the same as those of Example 2, except that: the comparative example does not contain strong aluminum oxide and magnesium hydroxide, and the comparative example 2 is prepared using the above-mentioned preparation process of the anti-corrosion and flame-retardant composite sealant for bridge cables.

[0039] like Figure 2 As shown, the sealants prepared in Examples 1 to 5 and the sealants prepared in Comparative Examples 1 and 2 were subjected to performance tests.

[0040] like Figure 2As shown, the sealants prepared in Examples 1 to 5 have enhanced tensile strength and flame retardant properties compared with the sealants prepared in Comparative Examples 1 and 2, and the flame retardant properties can reach V-0 level. It is worth noting that the higher the content of magnesium hydroxide and aluminum hydroxide in the formula, the better the flame retardant properties of the prepared sealant; the elongation at break of the sealant using KH560 in the formula is better than the elongation at break of the sealant using KH570 in the formula; the sealant prepared by using S303H and SAX750 in the formula has certain heat aging resistance, and there is no obvious attenuation of mechanical properties before and after heat aging, and still maintains good elasticity, and the bonding performance of the sealant prepared by using S303H and SAX750 in the formula is weakened, but still reaches a bonding performance of 55 kN / m and above, so that the sealant surface can be painted in actual use and has excellent adhesion.

[0041] In summary: when the bridge cable anti-corrosion and flame-retardant composite sealant is used, the rubber body formed after vulcanization has flame retardant properties, which can reach V-0 level. There is no obvious attenuation of mechanical properties before and after thermal aging, and it still maintains good elasticity. Aluminum hydroxide can react with oxygen atoms to form a dense oxide film on the surface of the sealant, preventing oxygen from entering the rubber, avoiding corrosion of the sealant by oxygen, acid and alkali and other substances, reducing the aging rate of the sealant, and extending the service life of the sealant.

[0042] like Figures 3 to 10 As shown, a preparation device for anti-corrosion and flame-retardant composite sealant for bridge cables includes: a dispersion kettle 1, a kettle cover 101, a split feeding mechanism 2 and a self-excited screening and filtering mechanism 3. The kettle cover 101 is fastened and assembled on the top of the dispersion kettle 1, and the dispersion kettle 1 and the kettle cover 101 cooperate to form a closed kettle body.

[0043] like Figure 3 As shown, the split feeding mechanism 2 is fixedly mounted above the kettle cover 101 and includes a screening guide barrel 201, the discharge port of which is connected to the feed port of the kettle cover 101. The screening guide barrel 201 temporarily stores the raw materials to be added and also provides space for screening the raw materials.

[0044] like Figure 3 As shown, the screening material guide cylinder 201 consists of a cylinder body 2011 and a material guide cylinder body 2012. The bottom of the inner wall of the cylinder body 2011 is designed in an inverted trapezoidal shape. This facilitates the downward flow of the raw materials within the screening material guide cylinder 201 along the inner wall. The cylinder body 2011 is connected to the feed port of the kettle cover 101 through the material guide cylinder body 2012.

[0045] like Figure 5As shown, a pair of discharge plates 209 are fixedly mounted on the outer side of the drive shaft 202, and the discharge plates 209 are arranged in conjunction with the cylinder 2011. The discharge plates 209 rotate in the screening guide cylinder 201 along with the rotation of the drive shaft 202, thereby stirring the raw materials accumulated below the cylinder 2011, thereby facilitating the transfer of the raw materials at the bottom of the cylinder 2011 into the guide cylinder 2012, thereby preventing the raw materials from accumulating at the bottom of the cylinder 2011.

[0046] like Figures 5 to 7 As shown, a driving shaft 202 is rotatably connected in the screening guide cylinder 201. The driving shaft 202 plays the role of assembling, fixing and rotating the feeding auger 203.

[0047] like Figures 3 to 5 As shown, a cylinder cover 204 is fixedly mounted on the top of the screening material guide cylinder 201, and the cylinder cover 204 cooperates with the screening material guide cylinder 201 to form a closed feeding cylinder. The raw materials to be added are temporarily stored in the closed feeding cylinder.

[0048] like Figures 3 to 5 As shown, a drive motor 205 is fixedly mounted on the side of the cylinder cover 204 facing away from the screening guide cylinder 201. The output shaft of the drive motor 205 is in driving connection with the drive shaft 202. The drive motor 205 provides power and rotates the drive shaft 202 by controlling the operation of the drive motor 205.

[0049] like Figures 3 to 5 As shown, one side of the screening material guide cylinder 201 is fixedly connected with a feeding pipe 206, which is arranged above the turning plate 303. The raw materials to be added are added into the screening material guide cylinder 201 through the feeding pipe 206.

[0050] like Figures 3 to 5 As shown, the feeding pipe 206 is internally threadedly connected with a blocking block 207. The feeding pipe 206 is sealed and blocked by the blocking block 207.

[0051] like Figures 3 to 5 As shown, one end of the blocking block 207 outside the feeding pipe 206 is fixedly connected with a disassembly handle 208. By controlling the rotation of the disassembly handle 208, the blocking block 207 can be conveniently disassembled.

[0052] like Figures 5 and 6 As shown, a feeding augers 203 is fixedly mounted on one side of the driving shaft 202 close to the kettle cover 101, and the feeding augers 203 are arranged in conjunction with the screening guide barrel 201. The rotation of the feeding augers 203 can continuously push and transport the material in the guide barrel 2012.

[0053] like Figures 5 to 10As shown, a pneumatic isolation unit is installed on the side of the drive shaft 202 close to the kettle cover 101. The pneumatic isolation unit includes a closed partition block 210, which is slidably assembled in the feed port of the kettle cover 101. The closed partition block 210 cooperates with the feed port of the kettle cover 101 to seal and protect the feed port, thereby spatially isolating the kettle cover 101 from the screening guide barrel 201, thereby preventing the external environment from affecting the vacuum and temperature in the dispersion kettle 1 when adding raw materials to the screening guide barrel 201.

[0054] like Figures 5 to 10 As shown, a sealing ring 211 is sleeved on the outer side of the closed partition block 210. The sealing ring 211 ensures that the closed partition block 210 seals and blocks the air inlet of the kettle cover 101.

[0055] like Figures 5 to 10 As shown, a movable connecting rod 212 is fixedly connected to one side of the closed partition block 210 close to the driving shaft 202. The movable connecting rod 212 plays the role of supporting, fixing and moving the closed partition block 210.

[0056] like Figures 5 to 7 As shown, a sliding drive chamber is defined within the drive shaft 202, into which a mobile connecting rod 212 is slidably mounted. The mobile connecting rod 212 is extended and driven by controlling the air pressure within the sliding drive chamber, thereby facilitating the synchronous movement of the mobile connecting rod 212 with the closed partition block 210. A tension spring 213 is mounted within the sliding drive chamber, with its ends fixedly connected to the drive shaft 202 and the mobile connecting rod 212, respectively. The contraction and reset of the tension spring 213 also retracts and resets the mobile connecting rod 212.

[0057] like Figures 5 to 7 As shown, an air guide baffle 214 is fixedly mounted in the cylinder cover 204 , and the driving shaft 202 is rotatably connected to the air guide baffle 214 .

[0058] Preferably, an air intake valve is fixedly connected to the outer side of the cylinder cover 204, and the air intake valve is communicated with the air guide baffle 214, so as to facilitate the delivery of compressed air to the air delivery duct 215 through the air intake valve, thereby facilitating the control of the movement and extension state of the movable connecting rod 212.

[0059] like Figures 5 to 8As shown, a delivery air channel 215 is defined within the air guide baffle 214, and an inner flow channel 216 is defined within the drive shaft 202. The inner flow channel 216 communicates with the sliding drive chamber. A plurality of evenly distributed communicating air holes are defined on the outside of the drive shaft 202, with the ends of the communicating air holes respectively communicating with the delivery air channel 215 and the inner flow channel 216. This facilitates the regulation of the air pressure within the sliding drive chamber by allowing compressed air to be delivered from the outside into the delivery air channel 215 along the delivery air channel 215 and the communicating air holes.

[0060] like Figures 5 to 9 As shown, the self-oscillating screening and filtering mechanism 3 is assembled within the screening guide barrel 201. It includes a lower screening mesh 301, which is fixedly connected to the inner wall of the screening guide barrel 201 and sleeved on the outside of the drive shaft 202. The lower screening mesh 301 re-screens the raw material after screening by the self-oscillating upper screen 304. Furthermore, the lower screening mesh 301 supports and limits the position of the limiting seal ring 308.

[0061] like Figure 5 As shown, a fixing collar 302 is arranged above the lower screening net 301, and the fixing collar 302 is fixedly mounted on the outside of the driving shaft 202. The fixing collar 302 serves to connect the flipping plates 303 with the driving shaft 202, so that the multiple flipping plates 303 can rotate synchronously with the rotation of the driving shaft 202 under the action of the fixing collar 302.

[0062] like Figure 5 As shown, multiple sets of evenly distributed turning plates 303 are fixedly connected to the outer side of the fixed collar 302. The multiple sets of turning plates 303 rotate with the rotation of the drive shaft 202 to continuously turn the raw materials on the self-excited upper screen 304, thereby avoiding the accumulation of raw materials and improving the screening efficiency of the self-excited upper screen 304.

[0063] like Figures 5 to 9 As shown, a self-exciting screening unit is disposed between the turning plate 303 and the lower screening mesh 301. The self-exciting screening unit includes a self-exciting upper screen 304, which is slidably mounted on the outside of the drive shaft 202. The outer wall of the self-exciting upper screen 304 slides with the inner wall of the screening guide barrel 201. The raw materials added to the feeding pipe 206 are oscillated and screened by the self-exciting upper screen 304.

[0064] like Figures 5 to 9As shown, a fixed gear ring 305 is fixedly connected to the bottom of the self-excited upper screen 304, and a movable gear ring 306 is provided below the fixed gear ring 305. A plurality of evenly distributed arc-shaped tooth grooves are provided on the side close to the fixed gear ring 305 and the movable gear ring 306. The movable gear ring 306 is fixedly sleeved on the outer side of the driving shaft 202. In actual application, the movable gear ring 306 can rotate synchronously with the rotation of the driving shaft 202. The cooperation of the fixed gear ring 305 with the arc-shaped tooth grooves on the movable gear ring 306 can drive the self-excited upper screen 304 to move back and forth along the driving shaft 202. The reciprocating movement of the fixed gear ring 305 plays an oscillation control role on the self-excited upper screen 304, thereby ensuring the high efficiency and stability of the self-excited upper screen 304 in screening the raw materials and avoiding the blockage of the self-excited upper screen 304 during the screening process.

[0065] like Figures 5 to 7 As shown, an elastic protective sleeve 307 is provided on the outer side of the fixed gear ring 305 and the movable gear ring 306. The two ends of the elastic protective sleeve 307 are respectively fixedly connected to the bottom surface of the self-excited upper screen 304 and the top surface of the lower screening mesh 301. The elastic protective sleeve 307 provides protective cover for the fixed gear ring 305 and the movable gear ring 306, preventing the fixed gear ring 305 and the movable gear ring 306 from being stuck by the raw material.

[0066] It is worth noting that the distance between the flipping plate 303 and the self-exciting upper screen 304 is greater than the up and down sliding distance of the self-exciting upper screen 304, thereby avoiding collision and interference between the flipping plate 303 and the self-exciting upper screen 304.

[0067] like Figures 5 to 9 As shown, a limit seal ring 308 is fixedly connected between the lower screening mesh 301 and the self-exciting upper screening mesh 304. The limit seal ring 308 plays a role in pulling and limiting the self-exciting upper screening mesh 304 and the lower screening mesh 301. At the same time, the self-exciting upper screening mesh 304 can be pulled and reset by the contraction and reset of the limit seal ring 308.

[0068] like Figures 5 to 9 As shown, a plurality of evenly distributed return springs 309 are arranged in the limiting sealing ring 308. The contraction and release of the plurality of return springs 309 support and reset the limiting sealing ring 308.

[0069] Specifically, an exhaust channel is provided in the self-excited upper screen 304 , and the exhaust channel serves to connect the limiting sealing ring 308 with the plurality of first one-way exhaust valves 310 .

[0070] like Figures 5 to 9As shown, a plurality of evenly distributed first one-way exhaust valves 310 are fixedly mounted within the self-exciting upper screen 304. The plurality of first one-way exhaust valves 310 communicate with the limiting seal ring 308 via an exhaust passage. When the limiting seal ring 308 contracts due to the compression of the self-exciting upper screen 304, the air within the limiting seal ring 308 can be blown into the self-exciting upper screen 304 along the exhaust passage and the plurality of first one-way exhaust valves 310. This blowing of air into the self-exciting upper screen 304 assists in preventing the self-exciting upper screen 304 from being blocked.

[0071] like Figures 5 to 9 As shown, a plurality of evenly distributed second one-way exhaust valves 311 are fixedly connected to the inner wall of the limiting sealing ring 308. The plurality of second one-way exhaust valves 311 blow air toward the self-exciting upper screen 304 and the lower screening mesh 301 to assist in blowing the raw materials between the self-exciting upper screen 304 and the lower screening mesh 301, thereby improving the efficiency of the lower screening mesh 301 in screening the raw materials and avoiding the accumulation of raw materials at the inclined end of the lower screening mesh 301.

[0072] like Figures 5 to 9 As shown, multiple evenly distributed one-way air inlet valves 312 are fixedly connected below the limiting seal ring 308. The provision of multiple one-way air inlet valves 312 allows air within the screening guide barrel 201 to be transported along the one-way air inlet valves 312 into the limiting seal ring 308, thereby resetting the limiting seal ring 308. Furthermore, by arranging the air inlets of the one-way air inlet valves 312 downward, the air inlet of the one-way air inlet valves 312 can be prevented from being blocked by raw material.

[0073] During specific use, the raw materials to be dispersed and mixed can be added into the dispersion kettle 1, and a closed kettle body is formed by the cooperation between the kettle cover 101 and the dispersion kettle 1, and the closed partition block 210 and the air inlet of the kettle cover 101. Subsequently, the raw materials in the closed kettle body can be stirred and dispersed by driving the stirring mechanism to rotate.

[0074] When it is necessary to add raw materials to the dispersion kettle 1, the disassembly handle 208 can be manually rotated to separate the blocking block 207 from the feeding tube 206, and then the raw materials to be added can be added to the screening guide barrel 201 along the feeding tube 206. When the addition is completed, the blocking block 207 can be reassembled into the feeding tube 206 by reverse rotation, so that the blocking block 207 can block the feeding tube 206. Subsequently, the driving shaft 202 can be driven to rotate by controlling the operation of the driving motor 205. During the rotation process, the driving shaft 202 can drive the turning plate 303 to rotate. The rotation of the turning plate 303 can turn the raw materials accumulated on the self-excited upper screen 304. The raw materials are screened by the cooperation of the self-excited upper screen 304 and the lower screening net 301 to prevent raw materials with particle diameters that do not meet the requirements from entering the dispersion kettle 1.

[0075] At the same time, the driving shaft 202 can drive the movable gear ring 306 to rotate during the rotation process, and the self-excited upper screen 304 can move back and forth up and down along the driving shaft 202 under the cooperation of the fixed gear ring 305 and the movable gear ring 306. The high-frequency reciprocating movement of the self-excited upper screen 304 makes the self-excited upper screen 304 vibrate. The vibration of the self-excited upper screen 304 can not only improve the screening efficiency, but also avoid the blockage of the self-excited upper screen 304.

[0076] In addition, the self-excited upper screen 304 moves back and forth, and the limiting sealing ring 308 can frequently contract and expand under the action of the self-excited upper screen 304. When the limiting sealing ring 308 contracts under the squeezing action of the self-excited upper screen 304, the air in the limiting sealing ring 308 can be discharged along the multiple first one-way exhaust valves 310 and the second one-way exhaust valves 311. The exhaust method through the multiple first one-way exhaust valves 310 and the second one-way exhaust valves 311 can assist in preventing the self-excited upper screen 304 from being blocked, and can blow and turn the material between the lower screening net 301 and the self-excited upper screen 304, thereby ensuring the screening efficiency and stability of the lower screening net 301 and the self-excited upper screen 304.

[0077] like Figure 11 As shown, an application of a corrosion-resistant and flame-retardant composite sealant for bridge cables includes a cable body 4, the outer side of which is wrapped and coated with a buffer wrap 5. The buffer wrap 5 acts as a buffer between the flame-retardant and fire-proof structure 6, the thermal insulation medium 7, and the cable body 4.

[0078] like Figure 11 As shown, a flame retardant and fireproofing mechanism 6 is mounted on the outside of the buffer wrap 5. The flame retardant and fireproofing mechanism 6 is composed of a fire-resistant wrapping layer 601 and a flame retardant sealant layer 602. The flame retardant sealant layer 602 is mounted on the outside of the buffer wrap 5. The flame retardant and fireproofing mechanism 6 provides flame retardant protection for the cable body 4.

[0079] like Figure 11 As shown, a heat insulating medium 7 is filled between the flame retardant sealant layer 602 and the buffer wrap layer 5, and a fire-resistant wrapping layer 601 is coated on the outside of the flame retardant sealant layer 602. The heat insulating medium 7 provides thermal insulation protection for the cable body 4, greatly reducing the adverse effects of heat on the cable body 4.

[0080] 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.

[0081] 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 bridge cable anticorrosion flame retardant composite sealant, characterized in that: The components of the anti-corrosion and flame-retardant composite sealant are: MS polymer, plasticizer, aluminum hydroxide, magnesium hydroxide, fumed silica, rheological additive, stabilizer, water scavenger, adhesion promoter and catalyst; The contents of the above components are as follows: MS polymer: 100 parts; plasticizer: 30-100 parts; aluminum hydroxide: 100-300 parts; magnesium hydroxide: 100-300 parts; fumed silica: 10-20 parts; rheological additive: 10-20 parts; stabilizer: 5-10 parts; water scavenger: 5-10 parts; adhesion promoter: 5-10 parts; catalyst: 0.5-2 parts; The MS polymer includes silane-modified polyether and α-silane-modified polyurethane; The fumed silica, aluminum hydroxide and magnesium hydroxide are all in microparticle form, and the particle sizes of the aluminum hydroxide and magnesium hydroxide are the same.

2. The bridge cable anticorrosion and flame retardant composite sealant according to claim 1 is characterized in that: The silane-modified polyether is at least one of S303H, SAX350, SAX580, and SAX750; the α-silane-modified polyurethane is at least one of STP-E10, STP-E30, and STP-E35; and the plasticizer is at least one of alkyl phenyl sulfonate, polyether polyol, and DINP.

3. The bridge cable anticorrosion and flame retardant composite sealant according to claim 1, characterized in that: The particle sizes of the aluminum hydroxide and the magnesium hydroxide are both 5000 meshes, the content of the aluminum hydroxide is not less than that of the magnesium hydroxide, the fumed silica is AEROSIL R974, and the stabilizer is a hindered amine light stabilizer.

4. The bridge cable anticorrosion and flame retardant composite sealant according to claim 1, characterized in that: The rheological additive is selected from at least one of polyamide wax, hydrogenated castor oil, and polyurea; the water scavenger 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 at least one of an organic tin catalyst, U-220H and U-130, TIB 226, and DBTDL.

5. A preparation device for anti-corrosion and flame-retardant composite sealant for bridge cables, characterized in that: include: A dispersion kettle, wherein a kettle cover is fastened on the top of the dispersion kettle, and the dispersion kettle and the kettle cover cooperate to form a closed kettle body; A split-type feeding mechanism is fixedly mounted above the kettle cover, comprising a screening material guide cylinder, the discharge port of which is in communication with the feed port of the kettle cover, a driving shaft rotatably connected in the screening material guide cylinder, a feeding augers fixedly mounted on the side of the driving shaft close to the kettle cover, the feeding augers cooperating with the screening material guide cylinder, and a pneumatic isolation unit mounted on the side of the driving shaft close to the kettle cover; A self-excited screening and filtering mechanism is assembled in the screening material guide barrel. The self-excited screening and filtering mechanism includes a lower screening net. The lower screening net is fixedly connected to the inner wall of the screening material guide barrel, and the lower screening net is sleeved on the outside of the driving shaft. A fixed ring is arranged above the lower screening net, and the fixed ring is fixedly sleeved on the outside of the driving shaft. A plurality of groups of evenly distributed flipping plates are fixedly connected to the outside of the fixed ring. A self-excited screening unit is arranged between the flipping plate and the lower screening net.

6. The equipment for preparing the anti-corrosion and flame-retardant composite sealant for bridge cables according to claim 5, characterized in that: A cylinder cover is fixedly mounted above the screening material guide cylinder, and the cylinder cover cooperates with the screening material guide cylinder to form a closed feeding cylinder. A driving motor is fixedly mounted on the side of the cylinder cover facing away from the screening material guide cylinder, and the output shaft of the driving motor is transmission-connected to the driving shaft.

7. The equipment for preparing the anti-corrosion and flame-retardant composite sealant for bridge cables according to claim 5, characterized in that: One side of the screening material guide cylinder is fixedly connected to a feeding pipe, the feeding pipe is arranged above the turning plate, and the feeding pipe is threadedly connected to a blocking block, and one end of the blocking block located outside the feeding pipe is fixedly connected to a disassembly handle.

8. The equipment for preparing the anti-corrosion and flame-retardant composite sealant for bridge cables according to claim 5, characterized in that: The screening material guide cylinder consists of two parts: a cylinder body and a material guide cylinder body. The bottom of the inner wall of the cylinder body is set in an inverted trapezoidal shape. The cylinder body is connected to the feed port of the kettle cover through the material guide cylinder body. A pair of discharge plates are fixedly sleeved on the outer side of the driving shaft, and the discharge plates are matched with the cylinder body.

9. The equipment for preparing the anti-corrosion and flame-retardant composite sealant for bridge cables according to claim 6, characterized in that: The pneumatic isolation unit includes a closed partition block, which is slidably assembled in the feed port of the kettle cover. A sealing ring is sleeved on the outer side of the closed partition block, and a movable connecting rod is fixedly connected to the side of the closed partition block close to the driving shaft.

10. An application of a corrosion-resistant and flame-retardant composite sealant for bridge cables, comprising a cable body, characterized in that: The outer side of the cable body is wrapped with a buffer wrapping layer, and the outer side of the buffer wrapping layer is covered with a flame retardant and fireproofing mechanism. The flame retardant and fireproofing mechanism consists of a fire-resistant wrapping layer and a flame retardant sealant layer. The flame retardant sealant layer is covered on the outer side of the buffer wrapping layer. A heat insulating medium is filled between the flame retardant sealant layer and the buffer wrapping layer, and the fire-resistant wrapping layer is coated on the outer side of the flame retardant sealant layer.

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