A flexible corrosion protection structure and its preparation method and engineering application

Abstract

This invention belongs to the field of engineering structure surface protection technology, specifically relating to a corrosion-resistant and anti-corrosion flexible protective structure, its preparation method, and engineering applications. The corrosion-resistant and anti-corrosion flexible protective structure provided by this invention includes, in sequence, a first sealant layer, an anti-corrosion tape, a coated plain weave cloth, a second sealant layer, a fiber mesh cloth, a third sealant layer, and a high-toughness, weather-resistant sealing roll; the anti-corrosion tape comprises polyester fiber cloth and an anti-corrosion paste. The corrosion-resistant and anti-corrosion flexible protective structure provided by this invention not only possesses corrosion-resistant and anti-corrosion properties but also exhibits waterproof, erosion-resistant, and fire-resistant temperature-resistant characteristics. It can be applied to the protection of newly built and in-service engineering steel structures or bridge cables and anchorage structures, and can also be used for seepage prevention, rust prevention, and erosion prevention of hydraulic steel structures or concrete structures. Furthermore, the corrosion-resistant and anti-corrosion flexible protective structure provided by this invention possesses high overall toughness and tensile strength, and can be used for the protection of structures under vibration conditions or various complex shapes.

Description

Technical Field

[0001] This invention belongs to the field of engineering structure surface protection technology, specifically relating to a corrosion-resistant and anti-corrosion flexible protective structure, its preparation method, and its engineering applications. Background Technology

[0002] The steel reinforcement inside steel structures or concrete is corroded by salt, humidity and other acidic gases in the atmosphere, which greatly reduces the service life of metal structures and directly affects their safety.

[0003] In particular, the marine atmospheric environment is more humid than that on land, and the presence of salt droplets in the air makes the corrosion of steel structures or the steel reinforcement inside concrete much more severe than inland.

[0004] Currently, conventional protective measures are far from sufficient to protect various building structures in marine environments. Summary of the Invention

[0005] The purpose of this invention is to provide a corrosion-resistant and anti-corrosion flexible protective structure, its preparation method, and its application in engineering structure protection. The corrosion-resistant and anti-corrosion flexible protective structure provided by this invention not only has corrosion-resistant and anti-corrosion properties, but also has waterproof, erosion-resistant, fire-resistant, and temperature-resistant characteristics. It can be used for the protection of newly built and in-service engineering steel structures or bridge cables and anchorage structures, and can also be used for seepage prevention, rust prevention, and erosion prevention of hydraulic steel structures or concrete structures. At the same time, the corrosion-resistant and anti-corrosion flexible protective structure provided by this invention has high toughness and tensile strength, and can be used for the protection of structures under vibration conditions or structures of various complex shapes, with good results.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a corrosion-resistant and anti-corrosion flexible protective structure, comprising a first sealant layer, an anti-corrosion tape, a coated fiber plain weave cloth, a second sealant layer, a fiber mesh cloth, a third sealant layer, and a high-toughness and weather-resistant sealing roll material stacked sequentially.

[0008] The anti-corrosion tape comprises fiber cloth and anti-corrosion paste; the anti-corrosion paste comprises the following components in parts by weight:

[0009] Rust-inhibiting and rust-preventing components: 3.5–10 parts; rust-inhibiting and rust-promoting components: 10–20 parts; inorganic fillers: 80–100 parts; additives: 120–170 parts.

[0010] The rust-inhibiting and rust-preventing components include chromate, aminohydroxymethyl phosphate, synthetic calcium sulfonate, and tannic acid, wherein the aminohydroxymethyl phosphate is a mixture of carbamate and hydroxyphosphate;

[0011] The rust-inhibiting and rust-promoting components include linseed oil and titanium dioxide;

[0012] The additives include yellow petrolatum, white petrolatum, and paraffin oil.

[0013] Preferably, the inorganic filler includes talc powder, and the talc powder has a mesh size of 800 to 1600 mesh.

[0014] Preferably, the anti-corrosion paste comprises the following components in parts by weight:

[0015] 1-2 parts chromate, 1-2 parts aminohydroxymethyl phosphate, 1-5 parts synthetic calcium sulfonate, 0.5-1 part tannic acid, 5-10 parts linseed oil, 5-10 parts titanium dioxide, 80-100 parts talc, 80-100 parts yellow petrolatum, 30-50 parts white petrolatum, and 10-20 parts paraffin oil.

[0016] Preferably, the fiber cloth is a polyester nonwoven fabric;

[0017] The thickness of the anti-corrosion strip is 0.8 to 1.5 mm.

[0018] Preferably, the materials of the first sealant layer, the second sealant layer and the third sealant layer are rust-inhibiting and heat-resistant sealants;

[0019] The preparation method of the rust-inhibiting and temperature-resistant sealant includes the following steps:

[0020] α,ω-dihydroxypolydimethylsiloxane, plasticizer and reinforcing filler are first mixed to obtain the base adhesive;

[0021] The base adhesive, flame retardant, coupling agent and catalyst are mixed to obtain a pre-made sealant;

[0022] The pre-made sealant, heat-resistant filler, iron phosphide and synthetic calcium sulfonate salt are mixed in a third step to obtain the rust-inhibiting and heat-resistant sealant; the heat-resistant filler includes nano fillers and / or basalt fiber powder materials.

[0023] The first mixture, the second mixture, and the third mixture each independently include vacuum mixing.

[0024] Preferably, the mass percentage of the iron phosphate in the rust-inhibiting and heat-resistant sealant is 0.1% to 0.5%.

[0025] The mass percentage of the synthetic calcium sulfonate salt to the mass of the rust-inhibiting and heat-resistant sealant is 1-2%.

[0026] Preferably, the basis weight of the coated fiber plain weave fabric is 210–220 g / m². 2 ;

[0027] The coated fiber plain weave fabric includes a fiber plain weave fabric and a coating material disposed on the fiber plain weave fabric. The fiber plain weave fabric is basalt mesh fabric or glass fiber plain weave fabric, and the coating material is liquid silicone.

[0028] The fiber mesh fabric has a basis weight of 80–100 g / m². 2 ;

[0029] The fiber mesh is either basalt mesh or glass fiber mesh, and the mesh size is 2mm × 2mm.

[0030] Preferably, the high-toughness and weather-resistant sealing roll is a composite of basalt fiber plain weave cloth or glass fiber plain weave cloth and ceramicized silicone rubber;

[0031] The thickness of the high-toughness and weather-resistant sealing roll is 0.5 to 1.5 mm.

[0032] This invention provides a method for preparing the corrosion-resistant and anti-corrosion flexible protective structure described in the above technical solution, comprising the following steps:

[0033] Apply a first sealant layer to the surface of the protected structure;

[0034] An anti-corrosion strip is provided on the surface of the first sealant layer;

[0035] A plain-weave fiber cloth is applied to the surface of the corrosion-resistant strip.

[0036] A second sealant layer, a fiber mesh layer, and a third sealant layer are sequentially applied to the surface of the coated plain weave fabric.

[0037] A high-toughness, weather-resistant sealing roll is applied to the surface of the third sealant layer.

[0038] This invention provides the application of the corrosion-resistant and anti-corrosion flexible protective structure described in the above technical solution or the corrosion-resistant and anti-corrosion flexible protective structure prepared by the preparation method described in the above technical solution in the protection of engineering structures;

[0039] The engineering structure includes a steel structure or a concrete structure.

[0040] This invention provides a flexible protective structure for corrosion prevention and protection, comprising a first sealant layer, an anti-corrosion tape, a coated fiber plain weave cloth, a second sealant layer, a fiber mesh cloth, a third sealant layer, and a high-toughness weather-resistant sealing roll material, stacked sequentially. The anti-corrosion tape comprises fiber cloth and anti-corrosion paste. The anti-corrosion paste comprises the following components in parts by weight: 3.5-10 parts of rust-inhibiting and rust-preventing component, 10-20 parts of rust-inhibiting and reinforcing component, 80-100 parts of inorganic filler, and 120-170 parts of additives. The rust-inhibiting and rust-preventing component comprises chromate, aminohydroxymethyl phosphate, synthetic calcium sulfonate, and tannic acid, wherein the aminohydroxymethyl phosphate is a mixture of carbamate and hydroxyphosphate. The rust-inhibiting and reinforcing component comprises linseed oil and titanium dioxide. The additives comprise yellow petrolatum, white petrolatum, and paraffin oil. In this invention, the first, second, and third sealant layers not only serve as adhesives between layers but also form a three-layer sealing structure, effectively preventing corrosive media from entering. The application of a plain-weave fiber fabric prevents the small molecules of the anti-corrosion paste from precipitating and invading the second sealant layer. Simultaneously, the fiber mesh fabric enhances the tensile strength of the second and third sealant layers, resulting in superior sealing performance and more effectively preventing corrosive media from entering. The chromate in the anti-corrosion tape forms a dense chromium oxide film, providing anti-corrosion properties. The aminohydroxymethylphosphonate modifies the chromium oxide film, enhancing its anti-corrosion ability in conjunction with the synthesized calcium sulfonate. The tannic acid hydrolyzes with iron oxides, generating divalent ions and releasing a large amount of oxygen and heat. These ions, oxygen, and heat work synergistically to thoroughly remove the iron oxide film and other impurities. The titanium dioxide, acting as an insulating agent, significantly enhances resistivity, hinders electron transfer, and suppresses the rate of electrochemical corrosion, thereby achieving enhanced corrosion resistance. The linseed oil further inhibits corrosion, and combined with the plasticizing, softening, and lubricating effects of the inorganic fillers and additives, the anti-corrosion tape achieves excellent corrosion-resistant and anti-corrosion functions. Finally, the high-toughness, weather-resistant sealing membrane, as the outermost protective layer, is not only fire-resistant and temperature-resistant but also resistant to rain erosion.

[0041] In summary, the first sealing layer, anti-corrosion tape, and coated fiber plain weave fabric provided by this invention possess sealing, corrosion-resistant, and anti-corrosion functions; the second sealing layer, fiber mesh fabric, third sealing layer, and high-toughness weather-resistant sealing roll possess sealing, waterproofing, and erosion-resistant functions; the high-toughness, high-strength, and integrally integrated corrosion-resistant and anti-corrosion flexible protective structure not only possesses corrosion-resistant and anti-corrosion performance, but also has waterproof, erosion-resistant, fire-resistant, and temperature-resistant properties. It can be used for the protection of newly built and in-service engineering steel structures or bridge cables and anchoring structures, and can also be used for seepage prevention, rust prevention, and erosion prevention of hydraulic steel structures or concrete structures. At the same time, the corrosion-resistant and anti-corrosion flexible protective structure provided by this invention has high overall toughness and tensile strength, and can be used for the protection of structures under vibration conditions or structures of various complex shapes.

[0042] Furthermore, in this invention, the materials of the first, second, and third sealant layers are rust-inhibiting and heat-resistant sealants. The preparation method of the rust-inhibiting and heat-resistant sealant includes the following steps: firstly, mixing α,ω-dihydroxypolydimethylsiloxane, a plasticizer, and reinforcing filler to obtain a base adhesive; secondly, mixing the base adhesive, a flame retardant, a coupling agent, and a catalyst to obtain a pre-formed sealant; and thirdly, mixing the pre-formed sealant, a heat-resistant filler, iron phosphide, and synthetic calcium sulfonate to obtain the rust-inhibiting and heat-resistant sealant. The heat-resistant filler includes nanofillers and / or basalt fiber materials. The first, second, and third mixing processes independently include vacuum mixing. The rust-inhibiting and heat-resistant sealant provided by this invention, through the combination of the above-mentioned raw materials, especially the addition of iron phosphide and synthetic calcium sulfonate, can effectively enhance the rust-preventing function of the rust-inhibiting and heat-resistant sealant. Simultaneously, the rust-inhibiting and heat-resistant sealant provided by this invention has weather resistance and sealing properties, effectively preventing aging from ultraviolet radiation and the ingress of corrosive media. Attached Figure Description

[0043] Figure 1 A schematic diagram of the corrosion-resistant flexible protective structure provided by the present invention;

[0044] Figure 1 In the middle: 1 is the protected structure; 2 is the sealant; 3 is the anti-corrosion tape; 4 is the coated fiber plain weave cloth; 5 is the fiber mesh cloth; 6 is the high-toughness weather-resistant sealing roll material;

[0045] Figure 2 The image shows a physical diagram of the corrosion-resistant flexible protective structure and its materials provided in Embodiment 2 of the present invention. Detailed Implementation

[0046] This invention provides a corrosion-resistant and anti-corrosion flexible protective structure, comprising a first sealant layer, an anti-corrosion tape, a coated fiber plain weave cloth, a second sealant layer, a fiber mesh cloth, a third sealant layer, and a high-toughness and weather-resistant sealing roll material stacked sequentially.

[0047] The anti-corrosion tape comprises fiber cloth and anti-corrosion paste; the anti-corrosion paste comprises the following components in parts by weight:

[0048] Rust-inhibiting and rust-preventing components: 3.5–10 parts; rust-inhibiting and rust-promoting components: 10–20 parts; inorganic fillers: 80–100 parts; additives: 120–170 parts.

[0049] The rust-inhibiting and rust-preventing components include chromate, aminohydroxymethyl phosphate, synthetic calcium sulfonate, and tannic acid, wherein the aminohydroxymethyl phosphate is a mixture of carbamate and hydroxyphosphate;

[0050] The rust-inhibiting and rust-promoting components include linseed oil and titanium dioxide;

[0051] The additives include yellow petrolatum, white petrolatum, and paraffin oil.

[0052] In this invention, unless otherwise specified, all raw materials / components used in the preparation are commercially available products well known to those skilled in the art.

[0053] Figure 1 This is a schematic diagram of the corrosion-resistant and anti-corrosion flexible protective structure provided by the present invention. The following is in conjunction with... Figure 1 The corrosion-resistant and anti-corrosion flexible protective structure provided by the present invention will be described in detail.

[0054] The corrosion-resistant and anti-corrosion flexible protective structure provided by this invention includes a first sealant layer. The first sealant layer is disposed on the surface of the protected structure. The protected structure is a building structure, preferably including a steel structure, a concrete structure, or a bridge cable-stayed structure. In this invention, the material of the first sealant layer is preferably a rust-inhibiting and temperature-resistant sealant.

[0055] The corrosion-resistant flexible protective structure provided by this invention includes an anti-corrosion strip 3 disposed on the surface of the first sealant layer. In this invention, the anti-corrosion strip comprises fiber cloth and anti-corrosion paste. The thickness of the anti-corrosion strip is preferably 0.8–1.5 mm. The fiber cloth is preferably polyester nonwoven fabric.

[0056] In this invention, the anti-corrosion paste comprises the following components in parts by weight:

[0057] Rust-inhibiting and rust-preventing components: 3.5–10 parts; rust-inhibiting and rust-promoting components: 10–20 parts; inorganic fillers: 80–100 parts; additives: 120–170 parts.

[0058] The rust-inhibiting and rust-preventing components include chromate, aminohydroxymethyl phosphate, synthetic calcium sulfonate, and tannic acid, wherein the aminohydroxymethyl phosphate is a mixture of carbamate and hydroxyphosphate;

[0059] The rust-inhibiting and rust-promoting components include linseed oil and titanium dioxide;

[0060] The additives include yellow petrolatum, white petrolatum, and paraffin oil.

[0061] The corrosion-resistant paste provided by this invention comprises 3.5 to 10 parts, preferably 10 parts, of a rust-inhibiting and anti-corrosion component by weight. In this invention, the rust-inhibiting and anti-corrosion component comprises chromate, aminohydroxymethyl phosphate, synthetic calcium sulfonate, and tannic acid. The aminohydroxymethyl phosphate is a mixture of carbamate and hydroxyphosphate. In this invention, the rust-inhibiting and anti-corrosion component preferably comprises 1 to 2 parts of chromate, 1 to 2 parts of aminohydroxymethyl phosphate, 1 to 5 parts of synthetic calcium sulfonate, and 0.5 to 1 part of tannic acid; more preferably, it comprises 2 parts of chromate, 2 parts of aminohydroxymethyl phosphate, 5 parts of synthetic calcium sulfonate, and 1 part of tannic acid. In this invention, the chromate is preferably an alkali metal chromate, and in the examples, it can be Na2CrO4. The chromate can form a dense chromium oxide film, which has the effect of delaying metal corrosion and is used as a rust inhibitor in concrete and building structures to prevent metal corrosion. The aminohydroxymethyl phosphate is a mixture of carbamate and hydroxyphosphate. The general chemical formula of the carbamate is RNHCOOR′. The carbamate mentioned in the examples can be methyl carbamate. The hydroxyphosphate mentioned in the examples can be calcium hydroxyphosphate. The mass ratio of carbamate to hydroxyphosphate in the mixture of carbamate and hydroxyphosphate is 1:1. The synthetic calcium sulfonate salt is purchased from Dongguan Hongli Chemical Technology Co., Ltd., product model T-106A. The synthetic calcium sulfonate salt has anti-rust function. The aminohydroxymethylphosphonate can modify the chromium oxide film and enhance its anti-corrosion ability together with the synthetic calcium sulfonate salt; the tannic acid can undergo a hydrolysis reaction with iron oxide to generate divalent ions and release a large amount of oxygen and heat. These ions, oxygen and heat can work synergistically to completely remove the iron oxide film and other impurities.

[0062] Based on the mass fraction of the rust-inhibiting and rust-preventing components, the corrosion-resistant paste provided by this invention comprises 10-20 parts of a rust-inhibiting and reinforcing component, preferably 20 parts. In this invention, the rust-inhibiting and reinforcing component comprises linseed oil and titanium dioxide. The water content of the linseed oil is preferably ≤0.01%, and the acid value is preferably ≤1 mg / g. The titanium dioxide is preferably nano-titanium dioxide. The average particle size of the nano-titanium dioxide is preferably 10-50 nm. In this invention, the rust-inhibiting and reinforcing component preferably comprises 5-10 parts of linseed oil and 5-10 parts of titanium dioxide, more preferably 10 parts of linseed oil and 10 parts of titanium dioxide. The titanium dioxide is an insulating agent, which can greatly enhance resistivity, hinder electron transfer, and suppress the rate of electrochemical corrosion, thereby obtaining enhanced corrosion resistance; the linseed oil can further inhibit corrosion.

[0063] Based on the mass fraction of the rust-inhibiting and rust-preventing components, the corrosion-preventing paste provided by the present invention comprises 80 to 100 parts of inorganic filler, preferably 100 parts. In the present invention, the inorganic filler preferably includes talc powder, and the mesh size of the talc powder is preferably 800 to 1600 mesh.

[0064] Based on the mass fraction of the rust-inhibiting and rust-preventing components, the anti-corrosion paste provided by the present invention comprises 120-170 parts of additives, preferably 170 parts. In the present invention, the additives include yellow petrolatum, white petrolatum, and paraffin oil. Preferably, the additives comprise 80-100 parts of yellow petrolatum, 30-50 parts of white petrolatum, and 10-20 parts of paraffin oil; more preferably, they comprise 100 parts of yellow petrolatum, 50 parts of white petrolatum, and 20 parts of paraffin oil. In the present invention, the yellow petrolatum serves to lubricate and promote the paste's consistency. The white petrolatum serves to lubricate and moisturize.

[0065] In this invention, the anti-corrosion paste preferably comprises the following components in parts by weight:

[0066] 1-2 parts chromate, 1-2 parts aminohydroxymethyl phosphate, 1-5 parts synthetic calcium sulfonate, 0.5-1 part tannic acid, 5-10 parts linseed oil, 5-10 parts titanium dioxide, 80-100 parts talc, 80-100 parts yellow petrolatum, 30-50 parts white petrolatum, and 10-20 parts paraffin oil.

[0067] In this invention, the anti-corrosion paste preferably further comprises the following components in parts by weight:

[0068] 2 parts chromate, 2 parts aminohydroxymethyl phosphate, 5 parts synthetic calcium sulfonate, 1 part tannic acid, 10 parts linseed oil, 10 parts titanium dioxide, 100 parts talc, 100 parts yellow petrolatum, 50 parts white petrolatum, and 20 parts paraffin oil.

[0069] In this invention, the method for preparing the anti-corrosion paste preferably includes the following steps:

[0070] The inorganic filler and additives are first mixed to obtain a first mixture;

[0071] The first mixture and the second rust-inhibiting component are mixed to obtain the second mixture;

[0072] The second mixture and the third rust-inhibiting component are mixed to obtain the corrosion-resistant paste.

[0073] In this invention, the first mixing is preferably carried out at room temperature, and the second mixing is preferably carried out under stirring conditions. The second mixing is performed in a bladed mixer, the temperature of the second mixing is preferably 100–105°C, and the mixing time is preferably 10–15 min. The second mixing is preferably carried out under stirring conditions, and the stirring speed is preferably 1000–1500 rpm. The third mixing is carried out in a bladed mixer, the temperature of the third mixing is preferably 110–120°C, and the mixing time is preferably 20–30 min. The third mixing is preferably carried out under stirring conditions, and the stirring speed is preferably 1000–1500 rpm.

[0074] In this invention, the anti-corrosion tape is preferably made of fiber cloth impregnated with the anti-corrosion paste. The preparation method of the anti-corrosion tape preferably includes the following steps: impregnating the fiber cloth with the anti-corrosion paste under traction conditions. In this invention, the fiber cloth is preferably tractioned by a traction device, and the traction speed is preferably 2-3 m / min. After impregnation, this invention preferably further includes: scraping the upper and lower surfaces of the fiber cloth impregnated with the anti-corrosion paste, preferably using a scraper.

[0075] The corrosion-resistant flexible protective structure provided by the present invention includes a coated fiber plain weave cloth disposed on the surface of the corrosion-resistant strip 3.

[0076] In this invention, the basis weight of the coated fiber plain weave fabric is preferably 210-220 g / m². 2 ;

[0077] In this invention, the coated fiber plain weave fabric preferably comprises a fiber plain weave fabric and a coating material disposed on the fiber plain weave fabric. The coated fiber plain weave fabric is preferably formed by covering the surface of the fiber plain weave fabric with the coating material. The specific embodiments of the covering preferably include spraying, roller coating, or impregnation. In this invention, the fiber plain weave fabric is preferably basalt mesh fabric or glass fiber plain weave fabric, and the coating material is preferably liquid silicone.

[0078] In this invention, the liquid silicone is preferably flame-retardant liquid silicone. In an embodiment of this invention, the flame-retardant liquid silicone is model JCM-1260, purchased from Shanghai Juesheng New Material Technology Co., Ltd.

[0079] The corrosion-resistant and anti-corrosion flexible protective structure provided by the present invention includes a second sealant layer disposed on the surface of the coated fiber plain weave fabric. In the present invention, the material of the second sealant layer is preferably a rust-inhibiting and temperature-resistant sealant.

[0080] The corrosion-resistant flexible protective structure provided by this invention includes a fiber mesh fabric 5 disposed on the surface of the second sealant layer. In this invention, the basis weight of the fiber mesh fabric 5 is preferably 80–100 g / m². 2 The fiber mesh is preferably basalt mesh or glass fiber mesh, and the mesh size of the fiber mesh is preferably 2mm × 2mm.

[0081] The corrosion-resistant and anti-corrosion flexible protective structure provided by the present invention includes a third sealant layer disposed on the surface of the fiber mesh fabric 5. In the present invention, the material of the third sealant layer is preferably a rust-inhibiting and temperature-resistant sealant.

[0082] The corrosion-resistant and anti-corrosion flexible protective structure provided by the present invention includes a high-toughness and weather-resistant sealing roll 6 disposed on the surface of the third sealing layer. In the present invention, the high-toughness and weather-resistant sealing roll is preferably basalt fiber plain weave cloth, or the high-toughness and weather-resistant sealing roll is a composite of glass fiber plain weave cloth and ceramicized silicone rubber.

[0083] In this invention, the thickness of the high-toughness weather-resistant sealing roll is 0.5–1.5 mm, preferably 1 mm. The thickness of the high-toughness weather-resistant sealing roll includes the thickness of single-sided or double-sided adhesive coating.

[0084] In this invention, the high-toughness and weather-resistant sealing roll is preferably a composite material made of basalt fiber cloth and ceramicized silicone rubber. In a specific embodiment of this invention, the high-toughness and weather-resistant sealing roll is specifically a flexible roll, which is the flexible roll disclosed in application number 202311597680.5, entitled "A Flexible Roll and Its Preparation Method and Application".

[0085] In this invention, the materials of the first sealant layer, the second sealant layer and the third sealant layer are preferably rust-inhibiting and heat-resistant sealants.

[0086] In this invention, the preparation method of the rust-inhibiting and temperature-resistant sealant preferably includes the following steps:

[0087] α,ω-dihydroxypolydimethylsiloxane, plasticizer and reinforcing filler are first mixed to obtain the base adhesive;

[0088] The base adhesive, flame retardant, coupling agent and catalyst are mixed to obtain a pre-made sealant;

[0089] The pre-made sealant, heat-resistant filler, iron phosphide and synthetic calcium sulfonate salt are mixed in a third step to obtain the rust-inhibiting and heat-resistant sealant; the heat-resistant filler includes nano fillers and / or basalt fiber materials.

[0090] The first mixture, the second mixture, and the third mixture each independently include vacuum mixing.

[0091] This invention involves first mixing α,ω-dihydroxypolydimethylsiloxane, a plasticizer, and reinforcing fillers to obtain a base adhesive. In this invention, the plasticizer preferably includes silicone oil, more preferably trimethylpolydimethylsiloxane; the mass ratio of α,ω-dihydroxypolydimethylsiloxane to the plasticizer is preferably 100:50–100, more preferably 100:60–90, and most preferably 100:60–80. This invention uses α,ω-dihydroxypolydimethylsiloxane as the base raw material for preparing the base adhesive. α,ω-dihydroxypolydimethylsiloxane is colorless, transparent, odorless, immiscible with water, non-toxic, non-volatile, and non-corrosive. It is stable in storage, non-flammable, and not easily ignited, thus improving the flame-retardant properties of the temperature-resistant flame-retardant sealant. Silicone oil is used as a plasticizer to adjust the viscosity of the temperature-resistant flame-retardant sealant (lower viscosity makes it easier to stir and process). During construction, a suitable viscosity facilitates the extrusion and application of the temperature-resistant flame-retardant sealant, improving its processing and performance. In this invention, the reinforcing filler preferably includes one or more of silica, calcium carbonate powder, kaolin, and mica powder; the mass ratio of α,ω-dihydroxypolydimethylsiloxane to the reinforcing filler is preferably 100:20-25, more preferably 100:21-25, and most preferably 100:23-25. This invention uses one or more of the following as reinforcing fillers: silica, calcium carbonate powder, kaolin, and mica powder. It has a thickening effect and improves the mechanical and rheological properties of the temperature-resistant and flame-retardant sealant.

[0092] In this invention, the first mixing includes vacuum mixing; the vacuum degree of the vacuum mixing is preferably 0.05-0.1 MPa, more preferably 0.06-0.09 MPa, and most preferably 0.07-0.08 MPa; the temperature of the first mixing is preferably 110-130°C, more preferably 110-125°C, and most preferably 115-120°C; the time of the first mixing is preferably 60-80 min, more preferably 65-75 min, and most preferably 70-73 min.

[0093] After the first mixing is completed, the present invention preferably further includes grinding the first mixture obtained from the first mixing. The present invention does not have special limitations on the grinding conditions, as long as the ground base adhesive is smooth and free of particles.

[0094] After obtaining the base adhesive, the present invention mixes the base adhesive, flame retardant, coupling agent, and catalyst to obtain a pre-formulated sealant. In the present invention, the flame retardant preferably comprises aluminosilicate and metal hydroxide; the metal hydroxide preferably comprises aluminum hydroxide and / or magnesium hydroxide; the mass ratio of aluminosilicate to metal hydroxide in the flame retardant is preferably 100:20-50, more preferably 100:20-40, and most preferably 100:20-30; the mass ratio of α,ω-dihydroxypolydimethylsiloxane to the flame retardant is preferably 100:100-150, more preferably 100:110-140, and most preferably 100:120-130. This invention uses a combination of aluminosilicate and metal hydroxide as a flame retardant. Aluminosilicate, as an inorganic silicon-based flame retardant, has low thermal conductivity and excellent thermal stability, chemical stability, and environmental performance. The metal hydroxide (aluminum hydroxide and / or magnesium hydroxide) acts as a flame retardant synergist, improving the flame retardant, mechanical, and temperature resistance properties of the temperature-resistant flame-retardant sealant. In this invention, the coupling agent preferably includes a silane coupling agent, more preferably silane coupling agent KH550 and / or silane coupling agent KH560; the mass ratio of α,ω-dihydroxypolydimethylsiloxane to the coupling agent is preferably 100:1 to 5, more preferably 100:2 to 4, and most preferably 100:2 to 3. This invention uses the multifunctional silane coupling agent KH550 and / or silane coupling agent KH560, which is beneficial for forming a three-dimensional network system and improves the adhesion performance of the temperature-resistant flame-retardant sealant. In this invention, the catalyst preferably comprises dibutyltin diacetate and / or dibutyltin dilaurate; the mass ratio of α,ω-dihydroxypolydimethylsiloxane to the catalyst is preferably 100:1 to 2, more preferably 100:1 to 1.8, and most preferably 100:1 to 1.5. The curing principle of the temperature-resistant flame-retardant sealant is as follows: the base adhesive in the temperature-resistant flame-retardant sealant, through a coupling agent and under the action of a catalyst, cures with moisture (water) in the air to form a sealing system. This invention, by adding a catalyst, helps to accelerate the curing speed and shorten the curing time when the temperature-resistant flame-retardant sealant cures into a sealing system.

[0095] In this invention, the second mixing includes vacuum mixing; the vacuum degree of the vacuum mixing is preferably 0.05-0.1 MPa, more preferably 0.06-0.09 MPa, and most preferably 0.07-0.08 MPa; the temperature of the second mixing is preferably 110-130°C, more preferably 110-125°C, and most preferably 115-120°C; the time of the second mixing is preferably 60-80 min, more preferably 65-75 min, and most preferably 70-73 min. In this invention, the second mixing preferably includes: mixing the base adhesive and flame retardant in a fourth step to obtain a fourth mixture; mixing the fourth mixture and coupling agent in a fifth step to obtain a fifth mixture; and mixing the fifth mixture and catalyst in a sixth step. In this invention, the time for the fourth, fifth, and sixth mixing steps is preferably ≥20 min, more preferably 20-25 min, and most preferably 20-23 min.

[0096] After obtaining the pre-made sealant, the present invention further mixes the pre-made sealant, heat-resistant filler, iron phosphide, and synthetic calcium sulfonate salt to obtain the rust-inhibiting and heat-resistant sealant; the heat-resistant filler includes nanofillers and / or basalt fiber materials. In the present invention, the heat-resistant filler includes nanofillers and / or basalt fiber materials; the nanofiller preferably includes nano-silica and / or nano-alumina; the basalt fiber material preferably includes basalt fiber powder and / or basalt flocculent fibers; the average diameter of the basalt flocculent fibers is preferably 3-6 μm, more preferably 3-5 μm, and most preferably 4-5 μm; the mass ratio of the pre-made sealant to the heat-resistant filler is preferably 100:2-5, more preferably 100:2-4, and most preferably 100:2-3. The purity of the iron phosphide is ≥99.5%. The mass percentage of the iron phosphide in the rust-inhibiting and heat-resistant sealant is preferably 0.1-0.5%. The synthetic calcium sulfonate salt was purchased from Dongguan Hongli Chemical Technology Co., Ltd., product model T-106A. The mass percentage of the synthetic calcium sulfonate salt in the rust-inhibiting and heat-resistant sealant is preferably 1-2%. This invention, by adding iron phosphide and synthetic calcium sulfonate salt in the third mixing process, can effectively improve the rust-preventing function of the rust-inhibiting and heat-resistant sealant. In this invention, the heat-resistant filler preferably undergoes dehydration before use; the dehydration temperature is preferably 105-110℃, more preferably 106-110℃, and most preferably 108-110℃; the dehydration time is preferably 2-2.5h, more preferably 2.1-2.4h, and most preferably 2.2-2.3h; the dehydration preferably includes vacuum dehydration, and the vacuum degree of the vacuum dehydration is preferably 0.1-0.2MPa, more preferably 0.1-0.18MPa, and most preferably 0.1-0.15MPa. This invention utilizes vacuum dehydration of the nanofiller to lower the boiling point within the container holding the aerogel, thereby causing water to evaporate from the surface of the material inside the cavity. Preferably, the iron phosphide or synthetic calcium sulfonate salt is further dried before use, preferably by baking, at a temperature of 100–105°C, and for a duration of ≥4°C.

[0097] In this invention, the third mixing includes vacuum mixing; the vacuum degree of the vacuum mixing is preferably 0.05-0.1 MPa, more preferably 0.06-0.09 MPa, and most preferably 0.07-0.08 MPa; the temperature of the third mixing is preferably 110-130°C, more preferably 110-125°C, and most preferably 115-120°C; the time of the third mixing is preferably 30-60 min, more preferably 30-50 min, and most preferably 40 min.

[0098] The rust-inhibiting and temperature-resistant sealant provided by this invention has excellent sealing performance, mechanical properties, flame retardant properties, and temperature resistance.

[0099] The corrosion-resistant flexible protective structure provided by this invention comprises, from the inside (the surface of the protected structure) to the outside, a first sealant layer, an anti-corrosion tape, a coated fiber plain weave cloth, a second sealant layer, a fiber mesh cloth, a third sealant layer, and a high-toughness, weather-resistant sealing roll material, layered sequentially. The thickness of the first sealant layer is preferably 0.3–0.5 mm, more preferably 0.5 mm. The thickness of the anti-corrosion tape is preferably 0.8–1.5 mm. The weight of the coated fiber plain weave cloth is 210–220 g / m². 2 The thickness of the second sealant layer is preferably 0.3–0.5 mm, more preferably 0.5 mm. The basis weight of the fiber mesh is preferably 80–100 g / m². 2 The thickness of the third sealing layer is preferably 0.3–0.5 mm, more preferably 0.5 mm. The thickness of the high-toughness weather-resistant sealing roll is 0.5–1.5 mm, more preferably 1 mm. The corrosion-resistant and anti-corrosion flexible protective structure provided by this invention not only possesses corrosion-resistant and anti-corrosion properties, but also has waterproof, erosion-resistant, fire-resistant, and temperature-resistant characteristics. It can be used for the protection of newly built and in-service engineering steel structures or bridge cables and anchoring structures, and can also be used for seepage prevention, rust prevention, and erosion prevention of hydraulic steel structures or concrete structures. At the same time, the corrosion-resistant and anti-corrosion flexible protective structure provided by this invention has high toughness and tensile strength, and can be used for the protection of structures under vibration conditions or structures of various complex shapes.

[0100] This invention provides a method for preparing the corrosion-resistant and anti-corrosion flexible protective structure described in the above technical solution, comprising the following steps:

[0101] Apply a first sealant layer to the surface of the protected structure;

[0102] An anti-corrosion strip is provided on the surface of the first sealant layer;

[0103] A plain-weave fiber cloth is sequentially applied to the surface of the anti-corrosion strip;

[0104] A second sealant layer, a fiber mesh layer, and a third sealant layer are sequentially applied to the surface of the coated plain weave fabric.

[0105] A high-toughness and weather-resistant sealing roll is applied to the surface of the third sealant layer. After the above-mentioned materials are naturally cured, a high-toughness, high-strength, and integral structure is formed, resulting in the corrosion-resistant and anti-corrosion flexible protective structure.

[0106] This invention involves applying a first sealant layer (hereinafter referred to as the first coating) to the surface of a protected structure. Prior to the first coating, the surface of the protected structure is preferably cleaned, preferably to remove stains, oil, and dust. The specific implementation process of the first coating is not particularly demanding. The coating thickness of the first sealant layer is preferably 0.3–0.5 mm.

[0107] After obtaining the first sealant layer, the present invention provides an anti-corrosion tape on the surface of the first sealant layer. In the present invention, the anti-corrosion tape is preferably provided by wrapping or pasting. The joints during the wrapping or pasting process preferably adopt an overlapping method, and the width of the overlap is preferably 1-2 cm.

[0108] After obtaining the anti-corrosion tape, the present invention applies a coated plain-weave fabric to the surface of the anti-corrosion tape. In this invention, the plain-weave fabric is preferably applied by wrapping or pasting. The joints during the wrapping or pasting process are preferably joined by overlapping, and the width of the overlap is preferably 0.5–1 cm.

[0109] After obtaining the plain weave fabric layer, the present invention sequentially coats (hereinafter referred to as the second coating) a sealant and sets a fiber mesh fabric on the surface of the coated fiber plain weave fabric to obtain a second sealant layer, a fiber mesh fabric, and a third sealant layer. In the present invention, the second coating method is preferably scraping. The initial sealant layer obtained by the second coating has a coating thickness of 0.6-1 mm. After obtaining the initial sealant layer, the present invention sets a fiber mesh fabric on the surface of the initial sealant layer. In the present invention, the fiber mesh fabric is preferably set by wrapping. The connection during the wrapping process is preferably by overlapping, and the overlap width is preferably ~2 cm. The initial sealant layer can overflow from the mesh of the fiber mesh fabric, and the sealant overflowing from the surface of the fiber mesh fabric is smoothed, thereby obtaining a second sealant layer and a third sealant layer on the two surfaces of the fiber mesh fabric respectively. The thickness of the second sealant layer is preferably 0.3-0.5 mm. The thickness of the third sealant layer is preferably 0.3-0.5 mm.

[0110] After obtaining the third sealant layer, the present invention applies a high-toughness, weather-resistant sealing roll to the surface of the third sealant layer, thereby obtaining the corrosion-resistant and anti-corrosion flexible protective structure. In the present invention, the high-toughness, weather-resistant sealing roll is preferably applied by wrapping or pasting, and the connection during the wrapping or pasting process is preferably made by overlapping, with the overlap width preferably being 1-2 cm.

[0111] This invention provides the application of the corrosion-resistant and anti-corrosion flexible protective structure described in the above technical solution or the corrosion-resistant and anti-corrosion flexible protective structure prepared by the preparation method described in the above technical solution in the protection of engineering structures.

[0112] In this invention, the engineering structure includes a building engineering structure, which preferably includes a steel structure, a concrete structure, or a bridge cable-stayed structure.

[0113] To further illustrate the present invention, the technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0114] In the following examples, "parts" refers to "parts by weight".

[0115] Example 1

[0116] This embodiment provides a corrosion-resistant and anti-corrosion flexible protective structure, including a first sealant layer, an anti-corrosion tape, a coated fiber plain weave cloth, a second sealant layer, a fiber mesh cloth, a third sealant layer, and a high-toughness and weather-resistant sealing roll material stacked in sequence.

[0117] The materials of the first sealant layer, the second sealant layer, and the third sealant layer are rust-inhibiting and temperature-resistant sealants.

[0118] The specific preparation methods for rust-inhibiting and temperature-resistant sealants include:

[0119] The raw materials used in the preparation of the rust-inhibiting and heat-resistant sealant, by weight, include: 100 parts of α,ω-dihydroxypolydimethylsiloxane, 60 parts of trimethylpolydimethylsiloxane, 25 parts of reinforcing filler, 100 parts of aluminosilicate, 20 parts of magnesium hydroxide, 2 parts of silane coupling agent KH560, 1 part of dibutyltin diacetate, 6.16 parts of basalt flocculent fiber, iron phosphide, and synthetic calcium sulfonate. The reinforcing filler is a mixture of silica and calcium carbonate powder, wherein the mass ratio of silica to calcium carbonate powder is 1:1.5. The iron phosphide accounts for 0.5% of the mass of the rust-inhibiting and heat-resistant sealant; the synthetic calcium sulfonate accounts for 2% of the mass of the rust-inhibiting and heat-resistant sealant.

[0120] The specific steps are as follows:

[0121] α,ω-dihydroxypolydimethylsiloxane, trimethylpolydimethylsiloxane, silica and calcium carbonate powder are mixed and put into a kneader for vacuum mixing to obtain a base adhesive. The vacuum degree of the vacuum mixing is 0.1 MPa and the temperature is 120℃.

[0122] The obtained base adhesive was ground by a three-roll mill and then placed in a high-speed stirrer reactor. Under the conditions of vacuum degree of 0.08MPa and temperature of 120℃, a mixture of aluminosilicate and magnesium hydroxide, silane coupling agent KH560 and dibutyltin diacetate were added to the ground base adhesive in sequence and stirred and mixed (the total stirring and mixing time was 70min) to obtain the pre-made sealant.

[0123] Basalt flocculent fibers were loaded into a stirring device, a vacuum of 0.1 MPa was set, and the temperature was raised to 110°C for dehydration.

[0124] The iron phosphide powder and the synthetic calcium sulfonate salt were dried at 105°C for no less than 4 hours.

[0125] The dehydrated basalt flocculent fibers, iron phosphide powder, and synthetic calcium sulfonate salt were added to the pre-made sealant and stirred for 40 minutes under a vacuum of 0.08 MPa and a temperature of 110°C to obtain a rust-inhibiting and heat-resistant sealant.

[0126] The method for preparing the anti-corrosion tape in this embodiment specifically includes:

[0127] Weigh out 100 parts of talc powder (mesh size 800-1600), 100 parts of yellow petrolatum, 50 parts of white petrolatum, and 20 parts of paraffin oil, and stir thoroughly at room temperature. Add 10 parts of nano titanium dioxide and 10 parts of linseed oil (water content ≤0.01%, acid value ≤1mg / g), and stir at 105℃ using a bladed mixer at 1000rpm for 10 minutes. Add 2 parts of chromate, 2 parts of aminohydroxymethyl phosphate, 5 parts of synthetic calcium sulfonate, and 1 part of tannic acid, and stir at 120℃ using a bladed mixer at 1000rpm for 20 minutes to obtain the anti-corrosion paste.

[0128] The fiber cloth is immersed in the above-mentioned anti-corrosion paste using a traction device at a traction speed of 3m / min, and then evenly coated by upper and lower scrapers; the resulting anti-corrosion tape has a thickness of about 1mm.

[0129] The performance test results of the anti-corrosion tape prepared in this embodiment are shown in Table 1. In Table 1: the mechanical property test refers to the standard GB / T 3923; the water absorption rate test refers to the standard GB / T 1462.

[0130] Table 1 Performance indicators of the anti-corrosion tape prepared in Example 1

[0131] 1 Tensile strength, N / 25mm 825 2 Elongation at break, % 5.5 3 Water absorption rate, % ≤1.0

[0132] In this embodiment, the fiber mesh is a basalt fiber mesh fabric with a mesh size of 2mm × 2mm and a basis weight of 100g / m². 2 .

[0133] In this embodiment, the high-toughness and weather-resistant sealing roll is a flexible roll, which is the flexible roll prepared in Example 1 of the application with application number 202311597680.5 and invention title "A flexible roll and its preparation method and application".

[0134] The method for preparing the corrosion-resistant and anti-corrosion flexible protective structure provided in this embodiment specifically includes:

[0135] Step 1: Clean the surface of the protected structure of oil, dust, and other stains;

[0136] Step 2: Apply a layer of rust-inhibiting and heat-resistant sealant evenly to the surface of the protected structure, maintaining a thickness of 0.5 mm, to obtain the first sealant layer;

[0137] Step 3: Wrap or stick a layer of anti-corrosion tape on the surface of the first sealant layer. When wrapping or sticking, use an overlapping method at the joints, with an overlap width of 1-2 cm.

[0138] Step 4: Wrap or paste a layer of coated fiber plain weave cloth on the surface of the anti-corrosion tape. The joints during the wrapping or bonding process should be overlapped, with an overlap width of 0.5 to 1 cm.

[0139] Step 5: Apply a layer of rust-inhibiting and heat-resistant sealant to the surface of the anti-corrosion strip, maintaining a thickness of 1mm, to obtain the initial sealant layer;

[0140] Step 6: Wrap a layer of basalt fiber mesh around the surface of the initial sealant layer, so that the initial sealant layer from step 4 can overflow from the mesh; the joints during the wrapping process are overlapped, with an overlap width of about 2cm.

[0141] Step 7: Smooth out any excess sealant on the surface of the basalt fiber mesh and wrap or paste a layer of high-toughness, weather-resistant sealing material, using a splicing method for connection.

[0142] Example 2

[0143] (1) Take a 150mm×150mm×150mm concrete test block, grind its surface smooth and clean it;

[0144] (2) Select one side and implement a protective structure on the center 100mm×100mm area;

[0145] (3) Apply a rust-inhibiting and heat-resistant sealant prepared in Example 1 with a thickness of 0.5 mm to the selected area to obtain the first sealant layer; after completion, attach the anti-corrosion tape prepared in Example 1.

[0146] (4) Wrap or paste a layer of coated fiber plain cloth on the surface of the anti-corrosion tape. The joints during the wrapping or bonding process shall be overlapped, with an overlap width of 0.5 to 1 cm.

[0147] (5) Coat the surface of plain weave fabric with the rust-inhibiting and heat-resistant sealant prepared in Example 1 with a thickness of 1 mm, and then attach a layer of basalt fiber mesh fabric from Example 1 so that the rust-inhibiting and heat-resistant sealant can overflow from the mesh and be evenly applied, so that a second sealant layer and a third sealant layer are obtained on the two surfaces of the basalt fiber mesh fabric respectively.

[0148] (6) A layer of high-toughness and weather-resistant sealing roll material from Example 1 is pasted onto the surface of the third sealant layer, and finally the edge is sealed with the rust-inhibiting and temperature-resistant sealant prepared in Example 1.

[0149] (7) Immediately immerse the completed concrete test block in water and leave it for 7 days. Observe the curing of the modified epoxy quartz adhesive and water-curing high-temperature resistant sealant inside, as well as whether there is water seepage at the internal interface of the concrete.

[0150] Cut open the protective structure on the surface of the specimen with a utility knife; the actual product image is shown below. Figure 2 As shown, the internal structure of the test block is complete and solid, the anti-corrosion strip and basalt fiber mesh are firmly attached without falling off, the interlayer structure is solid, the water-curing high-temperature resistant sealant is fully cured, and no water seepage is observed inside.

[0151] Example 3

[0152] (1) Take a Q235 carbon steel plate with dimensions of 60mm×80mm and a thickness of 1mm±0.2mm, and mark the effective protection area at the center position of the plate at 50mm×50mm.

[0153] (2) Clean the surface of the steel plate to remove dirt;

[0154] (3) Apply a rust-inhibiting and heat-resistant sealant prepared in Example 1 with a thickness of 0.5 mm to the steel plate protection area to obtain the first sealant layer; after completion, paste the anti-corrosion tape prepared in Example 1; then paste the coated fiber plain weave cloth on the surface of the anti-corrosion tape; then apply a rust-inhibiting and heat-resistant sealant prepared in Example 1 with a thickness of 1 mm to the surface of the plain weave cloth, and then paste a layer of basalt fiber mesh cloth in Example 1 so that the rust-inhibiting and heat-resistant sealant can overflow from the mesh and be spread evenly, and obtain the second sealant layer and the third sealant layer on the two surfaces of the basalt fiber mesh cloth respectively.

[0155] (4) A layer of high-toughness and weather-resistant sealing roll material from Example 1 is pasted onto the surface of the third sealant layer, and finally the edge is sealed with the rust-inhibiting and temperature-resistant sealant prepared in Example 1.

[0156] The corrosion-resistant and rust-inhibiting performance of the flexible protective structure on the surface of the specimens was tested through salt spray testing, and the interlayer peel strength was also tested. The test reference standard was GB / T32120 (no rust, Grade A; 1-10% rust, Grade B; 11-25% rust, Grade C; 26-50% rust, Grade D; 51-100% rust, Grade E). The test results are shown in Table 2. As can be seen from Table 2, there was no rust in the protected area of ​​the steel plate.

[0157] Table 2 shows the test results in the steel plate protection area in Example 3.

[0158] 1 Interlayer peel strength, N / 25mm ≥10 2 Resistance to neutral salt spray (720h) Grade A

[0159] Comparative Example 1

[0160] This comparative example was prepared to compare the rust-inhibiting effects of the anti-corrosion strip. This comparative example is basically the same as Example 1, except that:

[0161] (1) Take a Q235 carbon steel plate with dimensions of 60mm×80mm and a thickness of 1mm±0.2mm, and mark the effective protection area at the center position of the plate at 50mm×50mm.

[0162] (2) Clean the surface of the steel plate to remove dirt;

[0163] (3) Apply a rust-inhibiting and heat-resistant sealant prepared in Example 1 with a thickness of 0.5 mm to the steel plate protection area to obtain a first sealant layer; then attach the fiber cloth used to prepare the anti-corrosion strip, and then attach the fiber plain weave cloth to its surface; then apply a rust-inhibiting and heat-resistant sealant prepared in Example 1 with a thickness of 1 mm to the surface of the plain weave cloth, and then attach a layer of basalt fiber mesh cloth in Example 1 so that the rust-inhibiting and heat-resistant sealant can overflow from the mesh and be spread evenly, and obtain a second sealant layer and a third sealant layer on the two surfaces of the basalt fiber mesh cloth respectively.

[0164] (4) A layer of high-toughness and weather-resistant sealing roll material from Example 1 is pasted onto the surface of the third sealant layer, and finally the edge is sealed with the rust-inhibiting and temperature-resistant sealant prepared in Example 1.

[0165] The rust prevention and corrosion inhibition performance of the surface material of the specimens was tested by salt spray testing, and the interlayer peel strength was also tested. The test reference standard was GB / T32120 (no rust, Grade A; 1-10% rust, Grade B; 11-25% rust, Grade C; 26-50% rust, Grade D; 51-100% rust, Grade E). The test results showed that about 9% of the area protected by the steel plate was corroded. The test results are shown in Table 3.

[0166] Table 3 shows the test results in the steel plate protection area in Comparative Example 1.

[0167] 1 Interlayer peel strength, N / 25mm ≥10 2 Resistance to neutral salt spray (720h) Grade B

[0168] Comparative Example 2

[0169] This comparative example was prepared to compare the performance of rust-inhibiting and temperature-resistant sealants. This comparative example is basically the same as Example 1, except that:

[0170] The preparation method of the rust-inhibiting and temperature-resistant sealant used in this comparative example specifically includes:

[0171] The raw materials used in the preparation of the rust-inhibiting and temperature-resistant sealant, by weight, include: 100 parts of α,ω-dihydroxypolydimethylsiloxane, 60 parts of trimethylpolydimethylsiloxane, 25 parts of reinforcing filler, 100 parts of aluminosilicate, 20 parts of magnesium hydroxide, 2 parts of silane coupling agent KH560, 1 part of dibutyltin diacetate, 6.16 parts of basalt flocculent fiber, iron phosphide, and synthetic calcium sulfonate salt; the reinforcing filler is a mixture of silica and calcium carbonate powder, wherein the mass ratio of silica to calcium carbonate powder is 1:1.5.

[0172] The specific steps are as follows:

[0173] α,ω-dihydroxypolydimethylsiloxane, trimethylpolydimethylsiloxane, silica and calcium carbonate powder are mixed and put into a kneader for vacuum mixing to obtain a base adhesive. The vacuum degree of the vacuum mixing is 0.1 MPa and the temperature is 120℃.

[0174] The obtained base adhesive was ground by a three-roll mill and then placed in a high-speed stirrer reactor. Under the conditions of vacuum degree of 0.08MPa and temperature of 120℃, a mixture of aluminosilicate and magnesium hydroxide, silane coupling agent KH560 and dibutyltin diacetate were added to the ground base adhesive in sequence and stirred and mixed (the total stirring and mixing time was 70min) to obtain the pre-made sealant.

[0175] Basalt flocculent fibers were loaded into a stirring device, a vacuum of 0.1 MPa was set, and the temperature was raised to 110°C for dehydration.

[0176] The iron phosphide powder and the synthetic calcium sulfonate salt were dried at 105°C for no less than 4 hours.

[0177] The dehydrated basalt flocculent fibers, iron phosphide powder, and synthetic calcium sulfonate salt were added to the pre-made sealant and stirred for 40 minutes under a vacuum of 0.08 MPa and a temperature of 110°C to obtain a rust-inhibiting and heat-resistant sealant.

[0178] (1) Take a Q235 carbon steel plate with dimensions of 60mm×80mm and a thickness of 1mm±0.2mm, and mark the effective protection area at the center position of the plate at 50mm×50mm.

[0179] (2) Clean the surface of the steel plate to remove dirt;

[0180] (3) Apply a 0.5mm thick heat-resistant and flame-retardant sealant to the steel plate protection area to obtain the first sealant layer; after completion, paste the anti-corrosion tape prepared in Example 1; then paste the coated fiber plain weave cloth on the surface of the anti-corrosion tape; then apply a 1mm thick heat-resistant and flame-retardant sealant to the surface of the plain weave cloth, and then paste a layer of basalt fiber mesh cloth in Example 1 so that the heat-resistant and flame-retardant sealant can overflow from the mesh and be spread evenly, and obtain the second sealant layer and the third sealant layer on the two surfaces of the basalt fiber mesh cloth respectively.

[0181] (4) A layer of the high-toughness and weather-resistant sealing roll material in Example 1 is pasted on the surface of the third sealant layer, and finally the edge is sealed with flame-retardant sealant.

[0182] The corrosion-resistant and rust-inhibiting performance of the flexible protective structure on the surface of the specimens was tested through salt spray testing, and the interlayer peel strength was also tested. The test reference standard was GB / T32120 (no rust, Grade A; 1-10% rust, Grade B; 11-25% rust, Grade C; 26-50% rust, Grade D; 51-100% rust, Grade E). The test results showed that approximately 3% of the area within the steel plate protection zone developed rust. The test results are shown in Table 4.

[0183] Table 4 shows the test results in the steel plate protection area of ​​Comparative Example 2.

[0184] 1 Interlayer peel strength, N / 25mm ≥10 2 Resistance to neutral salt spray (720h) Grade B

[0185] As can be seen from the above embodiments, the present invention provides a flexible protective structure for corrosion prevention and protection, comprising a first sealant layer, an anti-corrosion tape, a coated fiber plain weave cloth, a second sealant layer, a fiber mesh cloth, a third sealant layer, and a high-toughness weather-resistant sealing roll material stacked sequentially; the anti-corrosion tape comprises fiber cloth and anti-corrosion paste. In the present invention, the first, second, and third sealant layers not only serve as adhesives between the layers but also form a three-layer sealing structure, effectively preventing the entry of corrosive media; simultaneously, the fiber mesh cloth enhances the tensile strength of the second and third sealant layers, thereby improving their sealing performance and more effectively preventing the entry of corrosive media. The chromate in the anti-corrosion tape can form a dense chromium oxide film, possessing anti-corrosion properties; the aminohydroxymethylphosphonate can modify the chromium oxide film, enhancing its anti-corrosion ability; the tannic acid can undergo a hydrolysis reaction with iron oxides, generating divalent ions and releasing a large amount of oxygen and heat. These ions, oxygen, and heat can work synergistically to thoroughly remove the iron oxide film and other impurities. The titanium dioxide, acting as an insulating agent, significantly enhances resistivity, hinders electron transfer, and suppresses the rate of electrochemical corrosion, thereby achieving enhanced corrosion resistance. The linseed oil further inhibits corrosion, and, combined with the plasticizing, softening, and lubricating effects of the inorganic fillers and additives, enables the anti-corrosion tape to possess excellent corrosion-resistant and anti-corrosion functions. The coated fiber plain weave fabric prevents the small molecules of the anti-corrosion paste from precipitating and invading the second sealant layer. Finally, the high-toughness, weather-resistant sealing roll, as the outermost protective layer, is not only fire-resistant and temperature-resistant but also resistant to rain erosion. In summary, the corrosion-resistant and anti-corrosion flexible protective structure provided by this invention not only possesses fire-resistant and temperature-resistant properties but also waterproof, erosion-resistant, and rust-resistant properties. It can be used for the protection of newly constructed steel structures or bridge cable stays, as well as for seepage prevention, rust prevention, and erosion prevention of hydraulic steel structures or concrete structures. Moreover, the corrosion-resistant and anti-corrosion flexible protective structure provided by this invention possesses high overall toughness and tensile strength, and its flexible structure allows for its application in the protection of dynamically loaded building structures or structures of various complex shapes.

[0186] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, and not all embodiments. Other embodiments can be obtained based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A flexible protective structure against corrosion and erosion, characterized in that, It includes a first sealant layer, an anti-corrosion tape, a coated fiber plain weave cloth, a second sealant layer, a fiber mesh cloth, a third sealant layer, and a high-toughness weather-resistant sealing roll material, which are stacked in sequence. The anti-corrosion tape comprises fiber cloth and anti-corrosion paste; the anti-corrosion paste comprises the following components in parts by weight: Rust-inhibiting and rust-preventing components: 3.5-10 parts; rust-inhibiting and rust-promoting components: 10-20 parts; inorganic fillers: 80-100 parts; additives: 120-170 parts. The rust-inhibiting and rust-preventing components include chromate, aminohydroxymethyl phosphate, synthetic calcium sulfonate, and tannic acid, wherein the aminohydroxymethyl phosphate is a mixture of carbamate and hydroxyphosphate; The rust-inhibiting and rust-promoting components include linseed oil and titanium dioxide; The additives include yellow petrolatum, white petrolatum, and paraffin oil; The materials of the first sealant layer, the second sealant layer and the third sealant layer are rust-inhibiting and heat-resistant sealants; The preparation method of the rust-inhibiting and temperature-resistant sealant includes the following steps: α,ω-dihydroxypolydimethylsiloxane, plasticizer and reinforcing filler are first mixed to obtain the base adhesive; The base adhesive, flame retardant, coupling agent and catalyst are mixed to obtain a pre-made sealant; The pre-made sealant, heat-resistant filler, iron phosphide and synthetic calcium sulfonate salt are mixed in a third step to obtain the rust-inhibiting and heat-resistant sealant; the heat-resistant filler includes nano fillers and / or basalt fiber powder materials. The first mixture, the second mixture, and the third mixture each independently include vacuum mixing.

2. The corrosion resistant flexible containment structure of claim 1, wherein, The inorganic filler includes talc powder, and the talc powder has a mesh size of 800~1600 mesh.

3. The corrosion-protective flexible protective structure according to claim 1 or 2, characterized in that The corrosion inhibitor comprises the following components in parts by weight: 1-2 parts chromate, 1-2 parts aminohydroxymethyl phosphate, 1-5 parts synthetic calcium sulfonate, 0.5-1 part tannic acid, 5-10 parts linseed oil, 5-10 parts titanium dioxide, 80-100 parts talc, 80-100 parts yellow petrolatum, 30-50 parts white petrolatum, and 10-20 parts paraffin oil.

4. The corrosion resistant flexible containment structure of claim 1, wherein, The fiber cloth is a polyester nonwoven fabric; The thickness of the anti-corrosion strip is 0.8~1.5mm.

5. The corrosion resistant flexible containment structure of claim 1, wherein, The percentage of the iron phosphate in the mass of the rust-inhibiting and temperature-resistant sealant is 0.1-0.5%. The mass percentage of the synthetic calcium sulfonate salt to the mass of the rust-inhibiting and heat-resistant sealant is 1-2%.

6. The corrosion resistant flexible containment structure of claim 1, wherein, The coated fiber plain cloth has a weight of 210-220 g / m 2 ; The coated fiber plain weave fabric includes a fiber plain weave fabric and a coating material disposed on the fiber plain weave fabric. The fiber plain weave fabric is a basalt mesh fabric or a glass fiber plain weave fabric, and the coating material is liquid silicone. The fiber mesh cloth basis weight is 80~100g / m 2 ; The fiber mesh is either basalt mesh or glass fiber mesh, and the mesh size is 2mm × 2mm.

7. The corrosion resistant flexible containment structure of claim 1, wherein, The high-toughness and weather-resistant sealing roll is made of basalt fiber plain weave cloth, or the high-toughness and weather-resistant sealing roll is made of glass fiber plain weave cloth and ceramicized silicone rubber composite. The thickness of the high-toughness and weather-resistant sealing roll is 0.5~1.5mm.

8. A method of producing the corrosion-protective flexible protective structure according to any one of claims 1 to 7, characterized in that Includes the following steps: A first sealant layer is applied to the surface of the protected structure; An anti-corrosion strip is provided on the surface of the first sealant layer; A plain-weave fiber cloth is applied to the surface of the anti-corrosion strip; A second sealant layer, a fiber mesh layer, and a third sealant layer are obtained by sequentially coating a sealant layer and setting a fiber mesh on the surface of the coated plain weave fabric. A high-toughness, weather-resistant sealing roll is applied to the surface of the third sealant layer to obtain the corrosion-resistant and anti-corrosion flexible protective structure.

9. The application of the corrosion-resistant and anti-corrosion flexible protective structure according to any one of claims 1 to 7 or the corrosion-resistant and anti-corrosion flexible protective structure prepared by the preparation method according to claim 8 in the protection of engineering structures; The engineering structure includes steel structure or concrete structure.

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