Anti-corrosion flexible protection structure and preparation method and engineering application thereof

Abstract

The invention belongs to the technical field of engineering structure surface protection, and particularly relates to an anti-corrosion flexible protection structure and a preparation method and engineering application thereof. The invention provides an anti-corrosion flexible protection structure. The anti-corrosion flexible protection structure comprises a first sealing glue layer, an anti-corrosion belt, coating plain cloth, a second sealing glue layer, fiber gridding cloth, a third sealing glue layer and a high-toughness weather-proof sealing coiled material which are sequentially arranged in a stacked mode. The anti-corrosion belt comprises polyester fiber cloth and anti-corrosion paste. The corrosion-resistant and corrosion-resistant flexible protection structure provided by the invention not only has corrosion-resistant and corrosion-resistant properties, but also has waterproof, anti-scouring, fire-resistant and temperature-resistant characteristics, can be applied to protection of newly-built and in-service running engineering steel structures or bridge cables, anchoring structures and the like, can also be used for seepage prevention, rust prevention and scouring prevention of hydraulic steel structures or concrete structures, and meanwhile, has the advantages of high corrosion resistance and corrosion resistance. The anti-corrosion flexible protection structure provided by the invention has high toughness and tensile strength on the whole, and can be applied to protection of vibration working condition structures or various complex shape structures.

Description

Technical Field

[0001] The present invention belongs to the technical field of surface protection of engineering structures, and in particular relates to a corrosion-resistant and flexible protective structure, a preparation method thereof, and engineering applications thereof. Background Art

[0002] The steel structure or the steel bars inside the concrete are affected by salt, humidity and other acidic gases in the atmospheric environment, causing corrosion, which greatly reduces the service life of the metal structure and directly affects its safety.

[0003] Especially in the marine atmosphere, the humidity is higher than on land, and there are salt droplets in the air, which makes the corrosion of steel structures or steel bars inside concrete much more serious than inland areas.

[0004] At present, conventional protective measures are far from sufficient to protect various building structures in the marine environment. Summary of the invention

[0005] The purpose of the present invention is to provide a corrosion-resistant and anti-corrosion flexible protective structure, a preparation method thereof and an application in the protection of engineering structures. The corrosion-resistant and anti-corrosion flexible protective structure provided by the present invention not only has corrosion-resistant and anti-corrosion properties, but also has waterproof, anti-scouring and 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 anchor structures, etc., and can also be used for the waterproofing, rust prevention and scouring prevention of hydraulic steel structures or concrete structures. At the same time, the corrosion-resistant and anti-corrosion flexible protective structure provided by the present invention has high toughness and tensile strength as a whole, and can be used in the protection of vibrating working structures or structures of various complex shapes, with good results.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a corrosion-resistant and flexible protective structure, comprising a first sealant layer, an anti-corrosion tape, a coated fiber plain cloth, a second sealant layer, a fiber mesh cloth, a third sealant layer and a high-toughness weather-resistant sealing coiled material which are sequentially stacked;

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

[0009] 3.5-10 parts of rust-proofing and anti-rusting components, 10-20 parts of promoting and enhancing rust-proofing components, 80-100 parts of inorganic fillers, and 120-170 parts of additives;

[0010] The rust-inhibiting and anti-rusting 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-promoting and enhancing component comprises linseed oil and titanium dioxide;

[0012] The auxiliary agents include yellow vaseline, white vaseline and paraffin oil.

[0013] Preferably, the inorganic filler comprises talcum powder, and the mesh size of the talcum powder is 800-1600 meshes.

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

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

[0016] Preferably, the fiber cloth is a polyester non-woven fabric;

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

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

[0019] The preparation method of the rust-resistant and heat-resistant sealant comprises the following steps:

[0020] Firstly mixing α,ω-dihydroxy polydimethylsiloxane, a plasticizer and a reinforcing filler to obtain a base rubber;

[0021] The base glue, flame retardant, coupling agent and catalyst are mixed for the second time to obtain a prefabricated sealant;

[0022] The prefabricated sealant, the heat-resistant filler, the iron phosphide and the synthetic calcium sulfonate are thirdly mixed to obtain the rust-resistant and heat-resistant sealant; the heat-resistant filler comprises a nano filler and / or a basalt fiber powder material;

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

[0024] Preferably, the mass of the iron phosphide accounts for 0.1-0.5% of the mass of the rust-resistant and heat-resistant sealant;

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

[0026] Preferably, the coated fiber plain weave fabric has a grammage of 210 to 220 g / m 2 ;

[0027] The coated fiber plain cloth comprises a fiber plain cloth and a coating material arranged on the fiber plain cloth, the fiber plain cloth is a basalt mesh cloth or a glass fiber plain cloth, and the coating material is liquid silica gel;

[0028] The fiber mesh cloth has a grammage of 80 to 100 g / m 2 ;

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

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

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

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

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

[0034] Arranging an anti-corrosion tape on the surface of the first sealant layer;

[0035] Disposing a coated fiber plain weave cloth on the surface of the anti-corrosion belt;

[0036] Sequentially coating the surface of the coated plain fabric with sealant and arranging a fiber mesh cloth to obtain a second sealant layer, a fiber mesh cloth and a third sealant layer;

[0037] A high-toughness weather-resistant sealing coil is arranged on the surface of the third sealant layer.

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

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

[0040] The invention provides a corrosion-resistant and anti-corrosion flexible protective structure, comprising a first sealant layer, an anti-corrosion belt, a coated fiber plain cloth, a second sealant layer, a fiber mesh cloth, a third sealant layer and a high-toughness weather-resistant sealing coiled material which are sequentially stacked; the anti-corrosion belt comprises a fiber cloth and an anti-corrosion paste; the anti-corrosion paste comprises the following components in parts by mass: 3.5 to 10 parts of a rust-resistant and anti-rust component, 10 to 20 parts of a promoting and enhancing rust-resistant component, 80 to 100 parts of an inorganic filler and 120 to 170 parts of an auxiliary agent; the rust-resistant and anti-rust component comprises chromate, aminohydroxymethyl phosphate, synthetic sulfonic acid calcium salt and tannic acid, and the aminohydroxymethyl phosphate is a mixture of carbamate and hydroxyphosphate; the promoting and enhancing rust-resistant component comprises linseed oil and titanium dioxide; the auxiliary agent comprises yellow vaseline, white vaseline and paraffin oil. In the present invention, the first sealant layer, the second sealant layer and the third sealant layer not only play a bonding role between the layers, but also can form a three-layer sealing structure to effectively prevent the entry of corrosive media; the coated fiber plain cloth can prevent the precipitation of small molecular materials of the anti-corrosion paste in the anti-corrosion belt from invading the second sealant layer; at the same time, the fiber mesh cloth can enhance the tensile strength of the second sealant layer and the third sealant layer, so that the sealing performance of the second sealant layer and the third sealant layer can be better, and the effect of preventing the entry of corrosive media can be more effectively played. The chromate in the anti-corrosion belt can form a dense chromium oxide film with anti-corrosion performance; the amino hydroxymethyl phosphonate can modify the chromium oxide film and enhance its anti-corrosion ability together with the synthetic calcium sulfonate; 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. The titanium dioxide is an insulating agent that can greatly enhance the resistivity, hinder electron transfer, and inhibit the occurrence rate of electrochemical corrosion, thereby obtaining enhanced corrosion resistance; the linseed oil can also further inhibit corrosion, and with the plasticizing, softening and lubricating effects of the inorganic filler and the auxiliary agent, the anti-corrosion belt can have good corrosion resistance and anti-corrosion functions. Finally, the high-toughness weather-resistant sealing coil is used as the outermost protective layer, which is not only fire-resistant and temperature-resistant, but also rain-resistant.

[0041] In summary, the first sealant layer, anti-corrosion tape, and coated fiber plain cloth provided by the present invention have the functions of sealing, corrosion resistance, and anti-corrosion; the second sealant layer, fiber mesh cloth, third sealant layer, and high-toughness weather-resistant sealing coil have the functions of sealing, waterproofing, and anti-scouring; the high-toughness and high-strength, integrated corrosion-resistant and anti-corrosion flexible protective structure not only has corrosion-resistant and anti-corrosion properties, but also has waterproof, anti-scouring, and 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 anchor structures, and can also be used for the waterproofing, rust prevention, and anti-scouring of hydraulic steel structures or concrete structures. At the same time, the corrosion-resistant and anti-corrosion flexible protective structure provided by the present invention has high toughness and tensile strength as a whole, and can be used for the protection of vibrating working conditions structures or structures of various complex shapes.

[0042] Furthermore, in the present invention, the materials of the first sealant layer, the second sealant layer and the third sealant layer are rust-resistant and heat-resistant sealants; the preparation method of the rust-resistant and heat-resistant sealant comprises the following steps: firstly mixing α, ω-dihydroxy polydimethylsiloxane, a plasticizer and a reinforcing filler to obtain a base glue; secondly mixing the base glue, a flame retardant, a coupling agent and a catalyst to obtain a prefabricated sealant; thirdly mixing the prefabricated sealant, a heat-resistant filler, iron phosphide and a synthetic calcium sulfonate salt to obtain the rust-resistant and heat-resistant sealant; the heat-resistant filler comprises nanofillers and / or basalt fiber materials; the first mixing, the second mixing and the third mixing independently comprise vacuum mixing. The rust-resistant and heat-resistant sealant provided by the present invention can effectively enhance the anti-rust function of the rust-resistant and heat-resistant sealant by combining the above-mentioned raw materials, especially the addition of iron phosphide and synthetic calcium sulfonate salt. At the same time, the rust-resistant and heat-resistant sealant provided by the present invention has weather resistance and sealing properties, and can effectively prevent aging due to ultraviolet radiation and the entry of corrosive media. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0044] Figure 1 Middle: 1 is the protected structure; 2 is the sealant; 3 is the anti-corrosion tape; 4 is the coated fiber plain cloth, 5 is the fiber mesh cloth; 6 is the high-toughness weather-resistant sealing coil;

[0045] Figure 2 A physical picture of the corrosion-resistant and anti-corrosion flexible protective structure and its materials provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0046] The present invention provides a corrosion-resistant and flexible protective structure, comprising a first sealant layer, an anti-corrosion tape, a coated fiber plain cloth, a second sealant layer, a fiber mesh cloth, a third sealant layer and a high-toughness weather-resistant sealing coiled material which are sequentially stacked;

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

[0048] 3.5-10 parts of rust-proofing and anti-rusting components, 10-20 parts of promoting and enhancing rust-proofing components, 80-100 parts of inorganic fillers, and 120-170 parts of additives;

[0049] The rust-inhibiting and anti-rusting 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-promoting and enhancing component comprises linseed oil and titanium dioxide;

[0051] The auxiliary agents include yellow vaseline, white vaseline and paraffin oil.

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

[0053] Figure 1 The structural diagram of the corrosion-resistant flexible protective structure provided by the present invention is as follows: Figure 1 The corrosion resistant and anti-corrosion flexible protective structure provided by the present invention is described in detail.

[0054] The corrosion-resistant flexible protective structure provided by the present invention comprises a first sealant layer. The first sealant layer is arranged on the surface of the protected structure. The protected structure is a building structure, and the building structure preferably comprises a steel structure, a concrete structure or a bridge cable-stayed structure. In the present invention, the material of the first sealant layer is preferably a rust-resistant and heat-resistant sealant.

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

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

[0057] 3.5-10 parts of rust-proofing and anti-rusting components, 10-20 parts of promoting and enhancing rust-proofing components, 80-100 parts of inorganic fillers, and 120-170 parts of additives;

[0058] The rust-inhibiting and anti-rusting 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-promoting and enhancing component comprises linseed oil and titanium dioxide;

[0060] The auxiliary agents include yellow vaseline, white vaseline and paraffin oil.

[0061] In terms of mass fraction, the anti-corrosion paste provided by the present invention comprises 3.5 to 10 parts of rust-proofing components, preferably 10 parts. In the present invention, the rust-proofing components include chromate, amino hydroxymethyl phosphate, synthetic calcium sulfonate and tannic acid. The amino hydroxymethyl phosphate is a mixture of carbamate and hydroxy phosphate. In the present invention, the rust-proofing components preferably include 1 to 2 parts of chromate, 1 to 2 parts of amino hydroxymethyl phosphate, 1 to 5 parts of synthetic calcium sulfonate and 0.5 to 1 part of tannic acid; more preferably, 2 parts of chromate, 2 parts of amino hydroxymethyl phosphate, 5 parts of synthetic calcium sulfonate and 1 part of tannic acid. In the present invention, the chromate is preferably an alkali metal chromate, which can be Na2CrO4 in the embodiment. 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 amino hydroxymethyl phosphate is a mixture of carbamate and hydroxy phosphate. The chemical structure formula of the carbamate is RNHCOOR'. The carbamate described in the embodiment can be methyl carbamate. The hydroxyphosphate described in the implementation can be calcium hydroxyphosphate. The mass ratio of the carbamate and the hydroxyphosphate in the mixture of the carbamate and the hydroxyphosphate is 1:1. The synthetic calcium sulfonate salt is purchased from Dongguan Hongli Chemical Technology Co., Ltd., and the product model is T-106A. The synthetic calcium sulfonate salt has an 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 the 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-proofing and anti-rusting components, the anti-corrosion paste provided by the present invention includes 10 to 20 parts of the promoting and enhancing rust-proofing components, preferably 20 parts. In the present invention, the promoting and enhancing rust-proofing components include 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 to 50 nm. In the present invention, the promoting and enhancing rust-proofing components preferably include 5 to 10 parts of linseed oil and 5 to 10 parts of titanium dioxide, and more preferably include 10 parts of linseed oil and 10 parts of titanium dioxide. The titanium dioxide is an insulating agent, which can greatly enhance the resistivity, hinder electron transfer, and inhibit the occurrence 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-proofing component, the anti-corrosion paste provided by the present invention includes 80 to 100 parts of inorganic filler, preferably 100 parts. In the present invention, the inorganic filler preferably includes talcum powder, and the mesh size of the talcum powder is preferably 800 to 1600 meshes.

[0064] Based on the mass fraction of the rust-proof and anti-rust components, the anti-corrosion paste provided by the present invention includes 120 to 170 parts of additives, preferably 170 parts. In the present invention, the additives include yellow vaseline, white vaseline and paraffin oil. In the present invention, the additives preferably include 80 to 100 parts of yellow vaseline, 30 to 50 parts of white vaseline and 10 to 20 parts of paraffin oil, and more preferably include 100 parts of yellow vaseline, 50 parts of white vaseline and 20 parts of paraffin oil. In the present invention, the role of the yellow vaseline is lubrication and paste-forming. The role of the white vaseline is lubrication and moisturizing.

[0065] In the present invention, the anti-corrosion paste preferably includes the following components in parts by mass:

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

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

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

[0069] In the present invention, the preparation method of the anti-corrosion paste preferably comprises the following steps:

[0070] The inorganic filler and the auxiliary agent are first mixed to obtain a first mixed material;

[0071] The first mixture and the promoting and enhancing rust-inhibiting component are mixed for the second time to obtain a second mixture;

[0072] The second mixed material and the rust-inhibiting component are thirdly mixed to obtain the anti-corrosion paste.

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

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

[0075] The corrosion-resistant and anti-corrosion flexible protective structure provided by the present invention comprises a coated fiber plain weave cloth arranged on the surface of the corrosion-resistant belt 3 .

[0076] In the present invention, the coated fiber plain weave fabric preferably has a grammage of 210 to 220 g / m 2 ;

[0077] In the present invention, the coated fiber plain weave cloth preferably comprises a fiber plain weave cloth and a coating material disposed on the fiber plain weave cloth. The coated fiber plain weave cloth is preferably prepared by covering the coating material on the surface of the fiber plain weave cloth. The specific implementation of the covering preferably includes spraying, roller coating or impregnation. In the present invention, the fiber plain weave cloth is preferably a basalt mesh cloth or a glass fiber plain weave cloth, and the coating material is preferably liquid silica gel.

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

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

[0080] The corrosion-resistant flexible protective structure provided by the present invention comprises a fiber mesh cloth 5 arranged on the surface of the second sealant layer. In the present invention, the weight of the fiber mesh cloth 5 is preferably 80 to 100 g / m 2 The fiber mesh cloth is preferably a basalt mesh cloth or a glass fiber mesh cloth, and the mesh size of the fiber mesh cloth is preferably 2 mm×2 mm.

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

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

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

[0084] In the present invention, the high-toughness weather-resistant sealing coil is preferably a composite of basalt fiber cloth and ceramic silicone rubber. In a specific embodiment of the present invention, the high-toughness weather-resistant sealing coil is specifically a flexible coil, and the flexible coil is a flexible coil disclosed in the application number 202311597680.5 and the invention name is "A flexible coil and its preparation method and application".

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

[0086] In the present invention, the method for preparing the rust-resistant and heat-resistant sealant preferably comprises the following steps:

[0087] Firstly mixing α,ω-dihydroxy polydimethylsiloxane, a plasticizer and a reinforcing filler to obtain a base rubber;

[0088] The base glue, flame retardant, coupling agent and catalyst are mixed for the second time to obtain a prefabricated sealant;

[0089] The prefabricated sealant, the heat-resistant filler, the iron phosphide and the synthetic calcium sulfonate are thirdly mixed to obtain the rust-resistant and heat-resistant sealant; the heat-resistant filler comprises a nano filler and / or a basalt fiber material;

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

[0091] The present invention first mixes α,ω-dihydroxy polydimethylsiloxane, a plasticizer and a reinforcing filler to obtain a base rubber. In the present invention, the plasticizer preferably includes silicone oil, more preferably trimethyl polydimethylsiloxane; the mass ratio of the α,ω-dihydroxy polydimethylsiloxane to the plasticizer is preferably 100:50-100, more preferably 100:60-90, and most preferably 100:60-80. The present invention uses α,ω-dihydroxy polydimethylsiloxane as the basic raw material for preparing the base glue. α,ω-dihydroxy polydimethylsiloxane is colorless, transparent, odorless, incompatible with water, non-toxic, non-volatile and non-corrosive, stable in storage, non-self-igniting, and not easy to ignite, which improves the flame retardant properties of the heat-resistant flame-retardant sealant; silicone oil is used as a plasticizer to adjust the viscosity of the heat-resistant flame-retardant sealant (the lower the viscosity of the heat-resistant flame-retardant sealant, the easier it is to stir and process); during the construction process, the appropriate viscosity can facilitate the extrusion and scraping of the heat-resistant flame-retardant sealant, thereby improving the processing performance and use performance of the heat-resistant flame-retardant sealant. In the present invention, the reinforcing filler preferably includes one or more of white carbon black, calcium carbonate powder, kaolin and mica powder; the mass ratio of the α,ω-dihydroxy polydimethylsiloxane to the reinforcing filler is preferably 100:20-25, more preferably 100:21-25, and most preferably 100:23-25. The invention adopts one or more of white carbon black, calcium carbonate powder, kaolin and mica powder as reinforcing fillers, has a thickening effect, and improves the mechanical properties and rheological properties of the heat-resistant flame-retardant sealant.

[0092] In the present invention, the first mixing includes vacuum mixing; the vacuum degree of the vacuum mixing is preferably 0.05-0.1MPa, more preferably 0.06-0.09MPa, and most preferably 0.07-0.08MPa; 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 60-80min, more preferably 65-75min, and most preferably 70-73min.

[0093] After the first mixing is completed, the present invention preferably further comprises grinding the first mixed material obtained by the first mixing. The present invention has no particular limitation on the grinding conditions, as long as the ground rubber base is smooth and free of graininess.

[0094] After obtaining the base glue, the present invention secondly mixes the base glue, flame retardant, coupling agent and catalyst to obtain a prefabricated sealant. In the present invention, the flame retardant preferably includes aluminosilicate and metal hydroxide; the metal hydroxide preferably includes aluminum hydroxide and / or magnesium hydroxide; the mass ratio of aluminosilicate and metal hydroxide in the flame retardant is preferably 100:20-50, more preferably 100:20-40, most preferably 100:20-30; the mass ratio of α,ω-dihydroxy polydimethylsiloxane and flame retardant is preferably 100:100-150, more preferably 100:110-140, most preferably 100:120-130. The present invention uses aluminosilicate and metal hydroxide as a flame retardant. Aluminosilicate is an inorganic silicon flame retardant with low thermal conductivity, excellent thermal stability, chemical stability and environmental protection performance; metal hydroxide (aluminum hydroxide and / or magnesium hydroxide) is used as a flame retardant synergist to improve the flame retardant properties, mechanical properties and temperature resistance of the heat-resistant flame-retardant sealant. In the present 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 the α,ω-dihydroxy polydimethylsiloxane to the coupling agent is preferably 100:1-5, more preferably 100:2-4, and most preferably 100:2-3. The present invention uses multi-functional silane coupling agent KH550 and / or silane coupling agent KH560, which is conducive to the formation of a three-dimensional network system and improves the bonding performance of the heat-resistant flame-retardant sealant. In the present invention, the catalyst preferably includes dibutyltin diacetate and / or dibutyltin dilaurate; the mass ratio of the α,ω-dihydroxypolydimethylsiloxane to the catalyst is preferably 100:1-2, more preferably 100:1-1.8, and most preferably 100:1-1.5. The curing principle of the heat-resistant flame-retardant sealant is that the base glue in the heat-resistant flame-retardant sealant is cured with moisture (water) in the air through a coupling agent under the action of a catalyst to form a sealing system. The present invention adds a catalyst, which is beneficial to accelerate the curing speed and shorten the curing time when the heat-resistant flame-retardant sealant is cured into a sealing system.

[0095] In the present invention, the second mixing includes vacuum mixing; the vacuum degree of the vacuum mixing is preferably 0.05-0.1MPa, more preferably 0.06-0.09MPa, and most preferably 0.07-0.08MPa; 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 60-80min, more preferably 65-75min, and most preferably 70-73min. In the present invention, the second mixing preferably includes: mixing the base rubber and the flame retardant for the fourth time to obtain a fourth mixture; mixing the fourth mixture and the coupling agent for the fifth time to obtain a fifth mixture; and mixing the fifth mixture and the catalyst for the sixth time. In the present invention, the time of the fourth mixing, the fifth mixing and the sixth mixing is independently preferably ≥20min, more preferably 20-25min, and most preferably 20-23min.

[0096] After obtaining the prefabricated sealant, the present invention thirdly mixes the prefabricated sealant, the heat-resistant filler, the iron phosphide and the synthetic calcium sulfonate salt to obtain the rust-resistant 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-silicon dioxide and / or nano-alumina; the basalt fiber material preferably includes basalt fiber powder and / or basalt flocculent fiber; the average diameter of the basalt flocculent fiber is preferably 3 to 6 μm, more preferably 3 to 5 μm, and most preferably 4 to 5 μm; the mass ratio of the prefabricated sealant and the heat-resistant filler is preferably 100:2 to 5, more preferably 100:2 to 4, and most preferably 100:2 to 3. The purity of the iron phosphide is ≥99.5%. The mass of the iron phosphide accounts for a percentage of the mass of the rust-resistant and heat-resistant sealant of preferably 0.1 to 0.5%. The synthetic calcium sulfonate salt is purchased from Dongguan Hongli Chemical Technology Co., Ltd., and the product model is T-106A. The mass of the synthetic calcium sulfonate salt accounts for a percentage of the mass of the rust-resistant and heat-resistant sealant that is preferably 1 to 2%. The present invention can effectively improve the anti-rust function of the rust-resistant and heat-resistant sealant by adding iron phosphide and synthetic calcium sulfonate salt in the third mixing process. In the present invention, the heat-resistant filler preferably also includes dehydration before use; the dehydration temperature is preferably 105 to 110°C, more preferably 106 to 110°C, and most preferably 108 to 110°C; the dehydration time is preferably 2 to 2.5h, more preferably 2.1 to 2.4h, and most preferably 2.2 to 2.3h; the dehydration preferably includes vacuum dehydration, and the vacuum degree of the vacuum dehydration is preferably 0.1 to 0.2MPa, more preferably 0.1 to 0.18MPa, and most preferably 0.1 to 0.15MPa. The present invention dehydrates the nanofiller by vacuum, reduces the boiling point in the cavity of the container containing the aerogel by vacuuming, and volatilizes the water on the surface of the material in the cavity. The iron phosphide or synthetic calcium sulfonate salt is preferably dried before use, and the drying is preferably drying, the drying temperature is preferably 100-105°C, and the drying time is preferably ≥4°C.

[0097] In the present invention, the third mixing includes vacuum mixing; the vacuum degree of the vacuum mixing is preferably 0.05-0.1MPa, more preferably 0.06-0.09MPa, and most preferably 0.07-0.08MPa; 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 30-60min, more preferably 30-50min, and most preferably 40min.

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

[0099] The corrosion-resistant flexible protective structure provided by the present invention is stacked from the inside (the surface of the protected structure) to the outside in sequence, with a first sealant layer, an anti-corrosion tape, a coated fiber plain cloth, a second sealant layer, a fiber mesh cloth, a third sealant layer and a high-toughness weather-resistant sealing coil. The thickness of the first sealant layer is preferably 0.3 to 0.5 mm, preferably 0.5 mm. The thickness of the anti-corrosion tape is preferably 0.8 to 1.5 mm. The coated fiber plain cloth has a grammage of 210 to 220 g / m 2 The thickness of the second sealant layer is preferably 0.3-0.5 mm, preferably 0.5 mm. The weight of the fiber mesh cloth is preferably 80-100 g / m 2 . The thickness of the third sealant layer is preferably 0.3-0.5 mm, preferably 0.5 mm. The thickness of the high-toughness weather-resistant sealing coil is 0.5-1.5 mm, preferably 1 mm. The corrosion-resistant and anti-corrosion flexible protective structure provided by the present invention not only has corrosion-resistant and anti-corrosion properties, but also has waterproof, anti-scouring and 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 anchor structures, etc., and can also be used for hydraulic steel structures or concrete structures. Anti-seepage, anti-rust, and anti-scouring, at the same time, the corrosion-resistant and anti-corrosion flexible protective structure provided by the present invention has high toughness and tensile strength as a whole, and can be used in the protection of vibrating working conditions structures or structures of various complex shapes.

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

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

[0102] Arranging an anti-corrosion tape on the surface of the first sealant layer;

[0103] sequentially arranging coated fiber plain weave cloth on the surface of the anti-corrosion belt;

[0104] Sequentially coating the surface of the coated plain fabric with sealant and arranging a fiber mesh cloth to obtain a second sealant layer, a fiber mesh cloth and a third sealant layer;

[0105] A high-toughness weather-resistant sealing coil is arranged on the surface of the third sealant layer. After the above-mentioned layers of materials are naturally cured, a high-toughness, high-strength, integrated structure is formed to obtain the corrosion-resistant and anti-corrosion flexible protective structure.

[0106] The present invention coats a first sealant layer on the surface of the protected structure (hereinafter referred to as the first coating). In the present invention, before the first coating, the present invention preferably cleans the surface of the protected structure, and the cleaning preferably removes stains on the surface of the protected structure, such as oil stains and dust. The present invention has no special requirements for the specific implementation process of the first coating. The coating thickness of the first sealant layer is preferably 0.3 to 0.5 mm.

[0107] After obtaining the first sealant layer, the present invention sets an anti-corrosion tape on the surface of the first sealant layer. In the present invention, the anti-corrosion tape is preferably set by wrapping or pasting. The connection during the wrapping or pasting process is preferably overlapped, and the overlap width is preferably 1 to 2 cm.

[0108] After obtaining the anti-corrosion belt, the present invention sets a coated fiber plain cloth on the surface of the anti-corrosion belt. In the present invention, the setting method of the plain cloth is preferably wrapping or pasting. The connection during the wrapping or pasting process is preferably overlapped, and the width of the overlap is preferably 0.5 to 1 cm.

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

[0110] After obtaining the third sealant layer, the present invention arranges a high-toughness weather-resistant sealing coil on the surface of the third sealant layer to obtain the corrosion-resistant flexible protective structure. In the present invention, the high-toughness weather-resistant sealing coil is preferably arranged by wrapping or pasting, and the connection during the wrapping or pasting process is preferably overlapped, and the overlap width is preferably 1 to 2 cm.

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

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

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

[0114] All “parts” in the following examples are “parts by mass”.

[0115] Example 1

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

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

[0118] The preparation method of the rust-resistant and heat-resistant sealant specifically comprises:

[0119] In terms of mass fraction, the raw materials used in the preparation of the rust-resistant and heat-resistant sealant include: 100 parts of α,ω-dihydroxy polydimethylsiloxane, 60 parts of trimethyl polydimethylsiloxane, 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 white carbon black and calcium carbonate powder, wherein the mass ratio of white carbon black to calcium carbonate powder is 1:1.5. The mass of the iron phosphide accounts for 0.5% of the mass of the rust-resistant and heat-resistant sealant; the mass of the synthetic calcium sulfonate accounts for 2% of the mass of the rust-resistant and heat-resistant sealant.

[0120] The specific steps are as follows:

[0121] α,ω-dihydroxy polydimethylsiloxane, trimethyl polydimethylsiloxane, white carbon black and calcium carbonate powder are mixed, put into a kneader, and vacuum mixed to obtain a base rubber, wherein the vacuum degree of the vacuum mixing is 0.1 MPa and the temperature is 120°C;

[0122] The obtained base glue was ground by a three-roll grinder and placed in a high-speed stirrer reactor. Under the conditions of a vacuum degree of 0.08 MPa and a temperature of 120°C, a mixture of aluminosilicate and magnesium hydroxide, a silane coupling agent KH560 and dibutyltin diacetate were sequentially added to the ground base glue and stirred and mixed (the stirring and mixing time was 70 minutes in total) to obtain a prefabricated sealant.

[0123] The basalt flocculent fibers were placed in a stirring device, the vacuum degree was set to 0.1 MPa, and the temperature was raised to 110°C for dehydration.

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

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

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

[0127] Respectively take 100 parts of talcum powder (mesh number is 800-1600), 100 parts of yellow vaseline, 50 parts of white vaseline, and 20 parts of paraffin oil, and fully stir them 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 them at 105 ℃ with a bladed stirrer at a speed of 1000rpm for 10 minutes; add 2 parts of chromate, 2 parts of amino hydroxymethyl phosphate, 5 parts of synthetic sulfonic acid calcium salt, and 1 part of tannic acid, and stir them at a temperature of 120 ℃ with a bladed stirrer at a speed of 1000rpm for 20 minutes to obtain an anti-corrosion paste.

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

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

[0130] Table 1 Performance index of the anti-corrosion strip obtained in Example 1

[0131] Serial number project Performance Data 1 Tensile strength, N / 25mm 825 2 Elongation at break, % 5.5 3 Water absorption, % ≤1.0

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

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

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

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

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

[0137] Step 3: wrap or stick a layer of anti-corrosion tape on the surface of the first sealant layer, and the joints in the wrapping or sticking process are overlapped, with an overlap width of 1 to 2 cm;

[0138] Step 4: wrap or stick a layer of coated fiber plain cloth on the surface of the anti-corrosion tape, and the joints in the wrapping or bonding process are overlapped, with an overlap width of 0.5 to 1 cm;

[0139] Step 5: Scrape a layer of rust-resistant and heat-resistant sealant on the surface of the anti-corrosion tape, keeping the thickness at 1 mm, to obtain an initial sealant layer;

[0140] Step 6: Wrap a layer of basalt fiber mesh cloth on the surface of the initial sealant layer so that the initial sealant layer in step 4 can overflow from the mesh holes; the connection during the wrapping process is overlapped, and the overlap width is about 2 cm;

[0141] Step seven, smooth out the sealant overflowing from the surface of the basalt fiber mesh cloth, and wrap or stick a layer of high-toughness weather-resistant sealing roll material, and the connection method is splicing.

[0142] Example 2

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

[0144] (2) Select one side and implement the protective structure in the central 100mm×100mm area;

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

[0146] (4) Wrap or stick a layer of coated fiber plain cloth on the surface of the anti-corrosion belt, and overlap the joints during wrapping or bonding, with an overlap width of 0.5 to 1 cm;

[0147] (5) The rust-resistant and heat-resistant sealant prepared in Example 1 is coated on the surface of the plain cloth with a thickness of 1 mm, and then a layer of the basalt fiber mesh cloth in Example 1 is pasted so that the rust-resistant and heat-resistant sealant can overflow from the mesh holes and is evenly applied to obtain the second and third sealant layers on the two surfaces of the basalt fiber mesh cloth, respectively.

[0148] (6) A layer of high-toughness weather-resistant sealing coiled material in Example 1 is pasted on the surface of the third sealant layer, and finally the rust-resistant and heat-resistant sealant prepared in Example 1 is used for edge sealing.

[0149] (7) The finished concrete test block was immediately immersed in water. After 7 days, the curing of the modified epoxy quartz glue and water-cured high-temperature resistant sealant inside was observed, as well as whether there was water seepage at the internal interface of the concrete.

[0150] Use a utility knife to cut open the protective structure on the surface of the specimen. The actual picture is as follows Figure 2 As shown, the internal structure of the test block is complete and solid, the anti-corrosion belt and basalt fiber mesh cloth are firm and not falling off, the interlayer structure is firm, the water-cured high-temperature resistant sealant is completely cured, and no water seepage is observed inside.

[0151] Example 3

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

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

[0154] (3) Applying the rust-resistant and heat-resistant sealant prepared in Example 1 with a thickness of 0.5 mm in the protection area of ​​the steel plate to obtain a first sealant layer; after completion, pasting the anti-corrosion tape prepared in Example 1; then pasting the coated fiber plain cloth on the surface of the anti-corrosion tape; then applying the rust-resistant and heat-resistant sealant prepared in Example 1 with a thickness of 1 mm on the surface of the plain cloth, and then pasting a layer of basalt fiber mesh cloth in Example 1 so that the rust-resistant and heat-resistant sealant can overflow from the mesh holes and be evenly applied, and obtaining 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 weather-resistant sealing coiled material in Example 1 is pasted on the surface of the third sealant layer, and finally the rust-resistant and heat-resistant sealant prepared in Example 1 is used for edge sealing.

[0156] The specimens were subjected to salt spray tests to test the rust resistance of the corrosion-resistant flexible protective structure on the surface of the specimens, and the interlayer peeling strength of the structure was tested. The test reference standard was: GB / T32120 (no corrosion, grade A; 1-10% corrosion degree, grade B; 11-25% corrosion degree, grade C; 26-50% corrosion degree, grade D; 51-100% corrosion degree, grade E). The test results are shown in Table 2. As can be seen from Table 2, there is no corrosion in the steel plate protection area.

[0157] Table 2 Test results in the steel plate protection area in Example 3

[0158] Serial number project Performance Data 1 Interlayer peel strength, N / 25mm ≥10 2 Neutral salt spray resistance (720h) A-level

[0159] Comparative Example 1

[0160] In order to compare the rust-proof effect of the anti-corrosion strip, this comparative example is prepared. This comparative example is basically the same as Example 1, except that:

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

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

[0163] (3) The rust-resistant and heat-resistant sealant prepared in Example 1 is coated in the protection area of ​​the steel plate with a thickness of 0.5 mm to obtain a first sealant layer; then a fiber cloth for preparing the anti-corrosion tape is pasted, and then a coated fiber plain cloth is pasted on the surface thereof; then the rust-resistant and heat-resistant sealant prepared in Example 1 is coated on the surface of the plain cloth with a thickness of 1 mm, and then a layer of basalt fiber mesh cloth in Example 1 is pasted so that the rust-resistant and heat-resistant sealant can overflow from the mesh holes and is evenly applied, and a second sealant layer and a third sealant layer are respectively obtained on the two surfaces of the basalt fiber mesh cloth.

[0164] (4) A layer of high-toughness weather-resistant sealing coiled material in Example 1 is pasted on the surface of the third sealant layer, and finally the rust-resistant and heat-resistant sealant prepared in Example 1 is used for edge sealing.

[0165] The specimens were subjected to a salt spray test to test the anti-rust performance of the surface materials of the specimens and the peel strength between the structural layers. 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 steel plate protection area was rusted. The test results are shown in Table 3.

[0166] Table 3 Test results in the steel plate protection area in Comparative Example 1

[0167] Serial number project Performance Data 1 Interlayer peel strength, N / 25mm ≥10 2 Neutral salt spray resistance (720h) Class B

[0168] Comparative Example 2

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

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

[0171] Measured in parts by mass, the raw materials used in the preparation of the rust-resistant and heat-resistant sealant 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 fibers, iron phosphide and synthetic calcium sulfonate; the reinforcing filler is a mixture of white carbon black and calcium carbonate powder, wherein the mass ratio of white carbon black to calcium carbonate powder is 1:1.5.

[0172] The specific steps are as follows:

[0173] α,ω-dihydroxy polydimethylsiloxane, trimethyl polydimethylsiloxane, white carbon black and calcium carbonate powder are mixed, put into a kneader, and vacuum mixed to obtain a base rubber, wherein the vacuum degree of the vacuum mixing is 0.1 MPa and the temperature is 120°C;

[0174] The obtained base glue was ground by a three-roll grinder and placed in a high-speed stirrer reactor. Under the conditions of a vacuum degree of 0.08 MPa and a temperature of 120°C, a mixture of aluminosilicate and magnesium hydroxide, a silane coupling agent KH560 and dibutyltin diacetate were sequentially added to the ground base glue and stirred and mixed (the stirring and mixing time was 70 minutes in total) to obtain a prefabricated sealant.

[0175] The basalt flocculent fibers were placed in a stirring device, the vacuum degree was set to 0.1 MPa, and the temperature was raised to 110°C for dehydration.

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

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

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

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

[0180] (3) A heat-resistant flame-retardant sealant with a thickness of 0.5 mm is applied to the protection area of ​​the steel plate to obtain a first sealant layer; after completion, the anti-corrosion tape prepared in Example 1 is pasted; then a coated fiber plain cloth is pasted on the surface of the anti-corrosion tape; then a heat-resistant flame-retardant sealant with a thickness of 1 mm is applied to the surface of the plain cloth, and then a layer of basalt fiber mesh cloth in Example 1 is pasted, so that the heat-resistant flame-retardant sealant can overflow from the mesh holes and is evenly applied, and a second sealant layer and a third sealant layer are respectively obtained on the two surfaces of the basalt fiber mesh cloth.

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

[0182] The specimens were subjected to a salt spray test to test the rust resistance of the corrosion-resistant flexible protective structure on the surface of the specimens, and the interlayer peeling strength of the structure was 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 3% of the steel plate protection area was rusted. The test results are shown in Table 4.

[0183] Table 4 Test results in the steel plate protection area in comparative example 2

[0184] Serial number project Performance Data 1 Interlayer peel strength, N / 25mm ≥10 2 Neutral salt spray resistance (720h) Class B

[0185] From the above embodiments, it can be seen that the present invention provides a corrosion-resistant and anti-corrosion flexible protective structure, including a first sealant layer, an anti-corrosion tape, a coated fiber plain cloth, a second sealant layer, a fiber mesh cloth, a third sealant layer and a high-toughness weather-resistant sealing coiled material stacked in sequence; the anti-corrosion tape includes a fiber cloth and an anti-corrosion paste. In the present invention, the first sealant layer, the second sealant layer and the third sealant layer not only play a bonding role between the layers, but also can form a three-layer sealing structure to effectively prevent the entry of corrosive media; at the same time, the fiber mesh cloth can enhance the tensile strength of the second sealant layer and the third sealant layer, so that the sealing performance of the second sealant layer and the third sealant layer can be more excellent, and more effectively prevent the entry of corrosive media. The chromate in the anti-corrosion tape can form a dense chromium oxide film with anti-corrosion performance; the aminohydroxymethylphosphonate can modify the chromium oxide film to enhance its anti-corrosion ability; 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. The titanium dioxide is an insulating agent, which can greatly enhance the resistivity, hinder the electron transfer, inhibit the occurrence rate of electrochemical corrosion, and thus obtain enhanced corrosion resistance; the linseed oil can also further inhibit corrosion, and cooperate with the plasticizing, softening and lubricating effects of the inorganic filler and the auxiliary agent, so that the anti-corrosion belt can have good corrosion resistance and anti-corrosion function. The coated fiber plain cloth can prevent the small molecule materials of the anti-corrosion paste in the anti-corrosion belt from precipitating and invading the second sealant layer; finally, the high-toughness weather-resistant sealing coil is used as the outermost protective layer, which is not only fire-resistant and heat-resistant, but also rain-resistant. In summary, the corrosion-resistant and anti-corrosion flexible protective structure provided by the present invention not only has fire-resistant and heat-resistant characteristics, but also has waterproof, anti-scouring, and rust-resistant properties. It can be used for the protection of newly built steel structures or bridge cables, and can also be used for the waterproofing, rust-proofing, and anti-scouring of hydraulic steel structures or concrete structures; moreover, the corrosion-resistant and anti-corrosion flexible protective structure provided by the present invention has high toughness and tensile strength as a whole, and the soft structure can be used in the protection of dynamic load building structures or structures of various complex shapes.

[0186] Although the above embodiment describes the present invention in detail, it is only a part of the embodiments of the present invention, not all of the embodiments. Other embodiments can be obtained based on this embodiment without creativity, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A corrosion-resistant flexible protective structure, characterized in that: It includes a first sealant layer, an anti-corrosion tape, a coated fiber plain cloth, a second sealant layer, a fiber mesh cloth, a third sealant layer and a high-toughness weather-resistant sealing coiled material which are stacked in sequence; The anti-corrosion tape comprises a fiber cloth and an anti-corrosion paste; the anti-corrosion paste comprises the following components in parts by mass: 3.5-10 parts of rust-proofing and anti-rusting components, 10-20 parts of promoting and reinforcing rust-proofing components, 80-100 parts of inorganic fillers, and 120-170 parts of additives; The rust-inhibiting and anti-rusting components include chromate, aminohydroxymethyl phosphate, synthetic calcium sulfonate and tannic acid, wherein the aminohydroxymethyl phosphate is a mixture of carbamate and hydroxyphosphate; The rust-promoting and enhancing component comprises linseed oil and titanium dioxide; The auxiliary agents include yellow vaseline, white vaseline and paraffin oil.

2. The corrosion-resistant flexible protective structure according to claim 1 is characterized in that: The inorganic filler includes talcum powder, and the mesh size of the talcum powder is 800-1600 meshes.

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

4. The corrosion-resistant flexible protective structure according to claim 1 is characterized in that: The fiber cloth is a polyester non-woven fabric; The thickness of the anti-corrosion strip is 0.8-1.5 mm.

5. The corrosion-resistant flexible protective structure according to claim 1 is characterized in that: The materials of the first sealant layer, the second sealant layer and the third sealant layer are rust-resistant and temperature-resistant sealants; The preparation method of the rust-resistant and heat-resistant sealant comprises the following steps: Firstly mixing α,ω-dihydroxy polydimethylsiloxane, a plasticizer and a reinforcing filler to obtain a base rubber; The base glue, flame retardant, coupling agent and catalyst are mixed for the second time to obtain a prefabricated sealant; The prefabricated sealant, the heat-resistant filler, the iron phosphide and the synthetic calcium sulfonate are thirdly mixed to obtain the rust-resistant and heat-resistant sealant; the heat-resistant filler comprises a nano filler and / or a basalt fiber powder material; The first mixing, the second mixing, and the third mixing independently include vacuum mixing.

6. The corrosion-resistant flexible protective structure according to claim 5 is characterized in that: The mass of the iron phosphide accounts for 0.1-0.5% of the mass of the rust-resistant and heat-resistant sealant; The mass percentage of the synthetic calcium sulfonate salt to the mass percentage of the rust-resistant and heat-resistant sealant is 1-2%.

7. The corrosion-resistant flexible protective structure according to claim 1 is characterized in that: The coated fiber plain weave fabric has a grammage of 210 to 220 g / m 2 ; The coated fiber plain cloth comprises a fiber plain cloth and a coating material arranged on the fiber plain cloth, the fiber plain cloth is a basalt mesh cloth or a glass fiber plain cloth, and the coating material is liquid silica gel; The fiber mesh cloth has a grammage of 80 to 100 g / m 2 ; The fiber mesh cloth is a basalt mesh cloth or a glass fiber mesh cloth, and the mesh size of the fiber mesh cloth is 2 mm×2 mm.

8. The corrosion-resistant flexible protective structure according to claim 1, characterized in that: The high-toughness weather-resistant sealing coil is a basalt fiber plain weave cloth, or the high-toughness weather-resistant sealing coil is a composite of glass fiber plain weave cloth and ceramic silicone rubber; The thickness of the high-toughness weather-resistant sealing coil is 0.5 to 1.5 mm.

9. The method for preparing the corrosion resistant flexible protective structure according to any one of claims 1 to 8, characterized in that: The following steps are involved: Applying a first sealant layer to the surface of the protected structure; Arranging an anti-corrosion tape on the surface of the first sealant layer; Disposing a coated fiber plain weave cloth on the surface of the anti-corrosion belt; Sequentially coating the surface of the coated plain fabric with sealant and arranging a fiber mesh cloth to obtain a second sealant layer, a fiber mesh cloth and a third sealant layer; A high-toughness weather-resistant sealing coil is arranged on the surface of the third sealant layer to obtain the corrosion-resistant and anti-corrosion flexible protective structure.

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

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