Waterproof and anti-corrosion waterstop for construction joints and preparation method thereof

Abstract

The present invention belongs to the technical field of building waterproofing, and relates to a waterproof and anti-corrosion waterstop for construction joints and a preparation method thereof. The waterproof and anti-corrosion waterstop for construction joints comprises a core material, a fiber mesh and a polymer coating on the surface of the core material; the fiber mesh comprises polyurethane fiber, ethylene-vinyl acetate copolymer, and hot melt adhesive; the polymer coating comprises epoxy resin, fluorocarbon resin, polyurethane, glass flakes, silane coupling agent, curing agent, and solvent; the preparation process comprises grinding the steel plate waterstop with a grinding wheel, and then evenly spraying a mixed solution prepared by ethanol, water, and silane coupling agent on its surface; placing polyurethane on the surface of the steel plate waterstop in advance, and injecting hot melt adhesive mixed with ethylene-vinyl acetate copolymer to form a fiber mesh; spraying the polymer coating, angle calendering, de-bubbling and compacting, and curing at room temperature. This type of waterstop has good strength and bending resistance, prevents damage to the coating during construction, has good anti-corrosion and waterproof properties, and has high weather resistance and anti-seepage properties.

Description

Technical Field

[0001] The invention belongs to the technical field of building waterproofing, and particularly relates to a waterproof and anti-corrosion waterstop for construction joints and a preparation method thereof. Background Art

[0002] In construction projects, construction joints are joints formed during the concrete pouring process due to the need for segmented pouring. Due to the discontinuity of the concrete, construction joints can easily become weak links in waterproofing. Waterstops are widely used in construction projects due to their high waterproofing reliability. Embedded waterstops are generally the preferred waterproofing method for construction joints. Currently, commonly used embedded waterstops for construction joints include steel-edged rubber waterstops, galvanized steel waterstops, and self-adhesive butyl rubber steel waterstops. These construction joint waterstops, to varying degrees, present a series of challenges, including difficulty in construction, poor durability, low bonding strength with post-cast concrete resulting in poor waterproofing effectiveness, and high construction costs. This often results in leaks in nine out of ten joints, significantly complicating waterproofing design and construction. This is especially true in environments exposed to moisture and corrosive media for extended periods, where waterstops are prone to aging and corrosion, resulting in reduced waterproofing effectiveness and impacting the structural safety and service life of the building. Therefore, developing a waterstop with excellent waterproofing and anti-corrosion properties is of great practical significance. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: In response to the above-mentioned defects, the present invention provides a construction joint waterproof and anti-corrosion waterstop. By wrapping a fiber mesh on the surface of the core material and coating the outer layer with a polymer coating, the waterstop has good strength and bending resistance, preventing damage to the coating during construction, and has good anti-corrosion and waterproof properties, as well as high weather resistance and anti-seepage properties.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows: a waterproof and anti-corrosion waterstop for construction joints, including a core material, a fiber mesh on the surface of the core material, and a polymer coating; the core material is a steel plate waterstop; the fiber mesh includes polyurethane fibers, ethylene-vinyl acetate copolymer, and hot melt adhesive; the polymer coating includes 15-20 parts of epoxy resin, 5-10 parts of fluorocarbon resin, 15-20 parts of polyurethane, 30-45 parts of glass flakes, 2-5 parts of silane coupling agent, 1-2 parts of curing agent, and 20 parts of solvent.

[0005] Through the above technical solution, a fiber mesh is provided on the surface of the core material, which protects the core material, isolates the steel plate from contact with corrosive environments such as moisture and chemical media, and extends the life of the steel plate. At the same time, the fiber mesh is lightweight, and does not affect the weight of the waterstop while maintaining the strength of the steel plate. The fiber mesh and the core material have a composite synergistic effect. The tensile and impact resistance of the embedded waterstop is enhanced during use, and it is not easy to crack during pouring. In addition, the fiber mesh also has the function of connecting the core plate and the polymer coating. The ethylene-vinyl acetate copolymer and hot melt adhesive in the fiber mesh have a bonding effect, the connection strength is high, the polymer coating is not easy to fall off, and the anti-corrosion and waterproof performance is reliable.

[0006] Secondly, the polymer coating adopts a combination of epoxy resin, fluorocarbon resin and polyurethane. A semi-interpenetrating polymer network and an interpenetrating network structure are formed between the epoxy resin and the polyurethane. The fluorocarbon resin has hydroxyl groups on its side chains. When in contact with the epoxy resin, the epoxy functional groups open and react with the hydroxyl groups on the fluorocarbon resin to form a cross-linked network, which synergistically improves the corrosion resistance, weather resistance and mechanical properties. The glass flakes serve as fillers and improve the interfacial bonding with the resin matrix through silane coupling agents. On the one hand, this reduces the use of fillers. On the other hand, the glass flakes are arranged in a stacking manner and doped and stacked in the cross-linked network of the coating resin matrix, thereby improving the water resistance of the surface of the polymer coating after curing, and improving the anti-penetration and corrosion resistance. The materials used in the polymer coating work together and have a fast curing speed. The three-dimensional structure formed after curing is stable and reliable, with high performance in heat resistance, aging resistance, acid and alkali resistance, and environmental protection. It protects the core material well, and the coating and fiber mesh are not damaged in the event of bending or collision, and the waterstop has a long service life.

[0007] Furthermore, the mass ratio of the ethylene-vinyl acetate copolymer to the hot melt adhesive is (2-5):1.

[0008] Through the above technical solution, ethylene-vinyl acetate copolymer (EVA) itself has adhesive properties, and the mass ratio with hot melt adhesive is controlled, retaining the polarity of EVA and the fluidity of hot melt adhesive. It has strong interface adaptability, moderate curing speed, and high bonding strength to the coating of polyurethane fibers and the surface of the core material.

[0009] Furthermore, the hot melt adhesive comprises the following components by weight: 30-35 parts of petroleum resin, 45-55 parts of rubber, 18-25 parts of naphthenic oil, 0.5-1 part of antioxidant, and 1-3 parts of titanium dioxide.

[0010] Through the above technical solution, the hot melt adhesive is provided with bonding properties and cohesive strength by petroleum resin. After being mixed with rubber, the bonding strength is increased, the high and low temperature performance is balanced, and it is easy to bend and has good deformation performance. The use of antioxidants can protect the rubber molecular chain, reduce the degradation of the hot melt adhesive during use, and extend the service life of the hot melt adhesive, that is, ensure the bonding strength of the fiber mesh on the core material surface and bond with the coating.

[0011] Furthermore, the warp and weft density of the polyurethane fibers in the fiber web on the core material is 100-150 fibers per square centimeter.

[0012] Through the above technical solution, the warp and weft density of the polyurethane fibers in the fiber web on the core material surface is controlled and distributed reasonably. Under the action of ethylene-vinyl acetate copolymer and hot melt adhesive, the polyurethane fibers will not agglomerate, nor will they be too sparse to affect the toughness and bending resistance of the fiber web.

[0013] Furthermore, the silane coupling agent is a mixture of KH-550 silane coupling agent and KH-901 silane coupling agent.

[0014] Through the above technical solution, KH-550 and KH-901 silane coupling agents are used to coordinate the adhesion between the compounded resin matrix and the glass flakes and the fiber mesh surface, resulting in good chemical interaction, good bonding between the components within the polymer coating, the polymer coating and the outer surface of the fiber mesh, and high performance.

[0015] Furthermore, the surface roughness of the steel plate waterstop is between 40 and 60 microns.

[0016] By controlling the surface roughness of the steel plate waterstop (i.e., core material), the adhesion between the fiber mesh, polymer coating, and the core material surface can be significantly improved.

[0017] The preparation method of waterproof and anti-corrosion waterstop for construction joints includes the following steps:

[0018] Step S1, grinding the steel plate waterstop: after grinding the steel plate waterstop with a grinding wheel, evenly spray a mixed solution prepared by ethanol, water, and silane coupling agent on its surface, wet it for 20-40 minutes, and detect the surface roughness of the steel plate waterstop;

[0019] Step S2, fiber mesh laying: placing the polished steel plate waterstop in a forming mold, placing polyurethane pre-placed on the surface of the steel plate waterstop, injecting hot melt adhesive mixed with ethylene-vinyl acetate copolymer, and covering with silicone oil paper to obtain a steel plate waterstop covered with a fiber mesh;

[0020] Step S3, polymer layer coating: spray the polymer coating on the surface of the steel plate waterstop strip coated with the fiber mesh obtained in step S2, with a spraying thickness of 0.8-1.5mm, and use a pressure roller to calender, defoam and compact along the surface of the waterstop strip at an angle of 30-60°, and cure at room temperature for 24-48 hours.

[0021] Through the above technical solution, the surface area is increased by grinding with a grinding wheel, and combined with silane coupling agent treatment, the adhesion between the steel plate waterstop and subsequent coatings is significantly improved; the polyurethane fibers in the fiber mesh provide skeleton support, and the combination of ethylene-vinyl acetate copolymer and hot melt adhesive achieves flexible bonding and reduces the risk of stress cracking; the polymer coating uses an epoxy-fluorocarbon-polyurethane resin matrix to provide chemical inertness, the glass flakes are arranged in a direction to form a maze-like anti-corrosion barrier, and the silane coupling agent enhances interface compatibility.

[0022] In addition, silicone oil paper is used to cover the surface to prevent colloid sagging and ensure that there are no bubbles between the fiber mesh and the steel plate. The melt blending temperature of EVA and hot melt adhesive must be controlled to prevent thermal degradation. The polymer coating is applied using angled calendering, where the rollers are tilted to reduce shear forces, promote directional alignment of the glass flakes, and improve the coating's impermeability.

[0023] Furthermore, the mass ratio of ethanol:water:silane coupling agent used during polishing of the steel plate waterstop is (5-8):(2-3):1. The rapid volatilization of ethanol promotes the self-assembly of silane into a film on the steel plate surface. Water acts as a hydrolysis medium to form a Si-O-Si network structure, enhancing chemical bonding with the coating. Controlling the hydrolysis concentration of the silane solution and the synergistic effect between the silane and the steel plate waterstop surface improves the adhesion and corrosion resistance of the fiber mesh, polymer coating, and steel plate waterstop.

[0024] Furthermore, the preparation method of the hot melt adhesive is as follows: titanium dioxide, antioxidant, cyclohexane oil and petroleum resin are added to a reaction container respectively, and the temperature is increased until the petroleum resin is melted; rubber is added in batches and stirred thoroughly, and after the rubber is completely melted, a molten hot melt adhesive is obtained.

[0025] Furthermore, the polymer coating is prepared by dispersing epoxy resin, fluorocarbon resin, and polyurethane in a xylene solvent and mixing them uniformly to obtain a coating base; adding glass flakes soaked in a silane coupling agent / ethanol solution; mixing the glass flakes, the silane coupling agent / ethanol solution, and the coating base, and ultrasonically dispersing them; adding a curing agent and stirring the mixture to obtain a polymer coating. Ultrasonic dispersion ensures that the flakes are evenly distributed in the resin, preventing sedimentation.

[0026] In summary, the beneficial effects of the present invention are:

[0027] 1. The waterproof and anti-corrosion waterstop for construction joints is a three-layer composite system. Through the coordinated design of steel plate, fiber mesh and polymer coating, it takes into account both mechanical strength and chemical protection. By significantly improving the adhesion with subsequent coatings, the fiber mesh layer acts as a stress buffer belt to reduce the risk of peeling between the steel plate and the coating due to temperature difference deformation. The peel strength has been tested to be ≥5MPa.

[0028] 2. The polymer coating is cured through the synergistic curing of epoxy resin and polyurethane, supplemented by the weather resistance of fluorocarbon resin. The glass flakes are pre-treated with silane coupling agent to achieve uniform dispersion, ensuring that the coating is dense and defect-free.

[0029] 3. Room temperature curing process (24-48h) simplifies on-site operation, and the spraying thickness of 0.8-1.5mm takes into account both economy and performance.

[0030] 4. This type of construction joint waterproof and anti-corrosion waterstop has good strength and bending resistance, can effectively prevent coating damage during construction, has good anti-corrosion and waterproof performance, and high weather resistance and anti-seepage performance. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] Example 1

[0033] A waterproof and anti-corrosion waterstop for construction joints, comprising a core material, a fiber mesh on the surface of the core material, and a polymer coating; the core material is a steel plate waterstop, and the surface roughness of the steel plate waterstop is between 40 and 45 microns;

[0034] The hot melt adhesive is premixed according to the following weight components: 35 parts of petroleum resin, 45 parts of rubber, 18 parts of naphthenic oil, 1 part of antioxidant, and 2.5 parts of titanium dioxide.

[0035] The fiber mesh includes polyurethane fibers, ethylene-vinyl acetate copolymer, and hot melt adhesive; the specific amount of polyurethane fibers used is a standard laying density of 100 strands per square centimeter on the core material, and the mass ratio of ethylene-vinyl acetate copolymer to hot melt adhesive is 2:1;

[0036] The polymer coating includes 15 parts of epoxy resin, 10 parts of fluorocarbon resin, 20 parts of polyurethane, 30 parts of glass flakes, 3 parts of silane coupling agent, 1 part of curing agent, and 20 parts of solvent; the silane coupling agent is a mixture of KH-550 silane coupling agent and KH-901 silane coupling agent in a mass ratio of 1:1, and the curing agent in this embodiment is 4,4'-diaminodiphenylmethane.

[0037] A method for preparing a waterproof and anti-corrosion waterstop for construction joints, comprising weighing the above weights and preparing the materials, including the following steps:

[0038] Step S1, grinding the steel plate waterstop: after grinding the steel plate waterstop with a grinding wheel, evenly spray a mixed solution prepared by ethanol, water, and silane coupling agent on its surface, wherein the mass ratio of ethanol: water: silane coupling agent used in the grinding of the steel plate waterstop is 5:3:1; wetting for 20 minutes, and testing the surface roughness of the steel plate waterstop until the roughness reaches between 40 and 45 microns;

[0039] Step S2, fiber web laying: titanium dioxide, antioxidant, naphthenic oil, and petroleum resin are added to a reaction vessel respectively, and the temperature is increased until the petroleum resin is melted; rubber is added in batches and stirred thoroughly until the rubber is completely melted to obtain a molten hot melt adhesive;

[0040] The polished steel plate waterstop is placed in a forming mold, polyurethane is placed on the surface of the steel plate waterstop, hot melt adhesive mixed with ethylene-vinyl acetate copolymer is injected, and silicone oil paper is used to cover it to obtain a steel plate waterstop covered with a fiber mesh;

[0041] Step S3, polymer layer coating: dispersing epoxy resin, fluorocarbon resin and polyurethane in xylene solvent and mixing them uniformly to obtain a coating substrate; adding glass flakes soaked in a silane coupling agent / ethanol solution; mixing the glass flakes, the silane coupling agent / ethanol solution and the coating substrate, and ultrasonically dispersing them; adding a curing agent, stirring and mixing uniformly to obtain a polymer coating;

[0042] The polymer coating is sprayed on the surface of the steel plate waterstop strip coated with the fiber mesh obtained in step S2, with a spraying thickness of 0.8 mm, and is calendered, defoamed and compacted at an angle of 60° along the surface of the waterstop strip by a pressure roller, and cured at room temperature for 48 hours.

[0043] Example 2

[0044] A waterproof and anti-corrosion waterstop for construction joints, comprising a core material, a fiber mesh on the surface of the core material, and a polymer coating; the core material is a steel plate waterstop, and the surface roughness of the steel plate waterstop is between 55 and 60 microns;

[0045] The hot melt adhesive is premixed according to the following weight components: 30 parts of petroleum resin, 55 parts of rubber, 25 parts of naphthenic oil, 0.5 parts of antioxidant, and 1 part of titanium dioxide.

[0046] The fiber mesh includes polyurethane fibers, ethylene-vinyl acetate copolymer, and hot melt adhesive; the specific amount of polyurethane fibers used is a standard laying density of 150 strands per square centimeter on the core material, and the mass ratio of ethylene-vinyl acetate copolymer to hot melt adhesive is 5:1;

[0047] The polymer coating includes 20 parts of epoxy resin, 5 parts of fluorocarbon resin, 15 parts of polyurethane, 45 parts of glass flakes, 5 parts of silane coupling agent, 2 parts of curing agent, and 20 parts of solvent; the silane coupling agent is a mixture of KH-550 silane coupling agent and KH-901 silane coupling agent in a mass ratio of 2:1, and the curing agent in this embodiment is toluene diisocyanate.

[0048] A method for preparing a waterproof and anti-corrosion waterstop for construction joints, comprising weighing the above weights and preparing the materials, including the following steps:

[0049] Step S1, grinding the steel plate waterstop: after grinding the steel plate waterstop with a grinding wheel, evenly spray a mixed solution prepared by ethanol, water, and silane coupling agent on its surface, wherein the mass ratio of ethanol: water: silane coupling agent used in the grinding of the steel plate waterstop is 8:2:1; wetting for 40 minutes, and testing the surface roughness of the steel plate waterstop until the roughness reaches between 55 and 60 microns;

[0050] Step S2, fiber web laying: titanium dioxide, antioxidant, naphthenic oil, and petroleum resin are added to a reaction vessel respectively, and the temperature is increased until the petroleum resin is melted; rubber is added in batches and stirred thoroughly until the rubber is completely melted to obtain a molten hot melt adhesive;

[0051] The polished steel plate waterstop is placed in a forming mold, polyurethane is placed on the surface of the steel plate waterstop, hot melt adhesive mixed with ethylene-vinyl acetate copolymer is injected, and silicone oil paper is used to cover it to obtain a steel plate waterstop covered with a fiber mesh;

[0052] Step S3, polymer layer coating: dispersing epoxy resin, fluorocarbon resin and polyurethane in xylene solvent and mixing them uniformly to obtain a coating substrate; adding glass flakes soaked in a silane coupling agent / ethanol solution; mixing the glass flakes, the silane coupling agent / ethanol solution and the coating substrate, and ultrasonically dispersing them; adding a curing agent, stirring and mixing uniformly to obtain a polymer coating;

[0053] The polymer coating is sprayed on the surface of the steel plate waterstop strip coated with the fiber mesh obtained in step S2, with a spraying thickness of 1.5 mm, and is calendered, defoamed and compacted at an angle of 30-60° along the surface of the waterstop strip by a pressure roller, and cured at room temperature for 24 hours.

[0054] Example 3

[0055] A waterproof and anti-corrosion waterstop for construction joints includes a core material, a fiber mesh on the surface of the core material, and a polymer coating; the core material is a steel plate waterstop, and the surface roughness of the steel plate waterstop is between 50 and 55 microns.

[0056] The hot melt adhesive is premixed according to the following weight components: 32 parts of petroleum resin, 50 parts of rubber, 22 parts of naphthenic oil, 0.8 parts of antioxidant, and 2 parts of titanium dioxide.

[0057] The fiber mesh includes polyurethane fibers, ethylene-vinyl acetate copolymer, and hot melt adhesive. The specific amount of polyurethane fibers used is a standard laying density of 100-150 strands per square centimeter on the core material, and the mass ratio of ethylene-vinyl acetate copolymer to hot melt adhesive is 4:1.

[0058] The polymer coating includes 16 parts of epoxy resin, 5 parts of fluorocarbon resin, 18 parts of polyurethane, 35 parts of glass flakes, 4 parts of silane coupling agent, 1.5 parts of curing agent, and 20 parts of solvent; the silane coupling agent is a mixture of KH-550 silane coupling agent and KH-901 silane coupling agent in a mass ratio of 3:2, and the curing agent is 4,4'-diaminodiphenylmethane.

[0059] A method for preparing a waterproof and anti-corrosion waterstop for construction joints, comprising weighing the above weights and preparing the materials, including the following steps:

[0060] Step S1, grinding the steel plate waterstop: after grinding the steel plate waterstop with a grinding wheel, evenly spray a mixed solution prepared by ethanol, water, and silane coupling agent on its surface, wherein the mass ratio of ethanol: water: silane coupling agent used in the grinding of the steel plate waterstop is 6.5:2.5:1; wetting for 30 minutes, and testing the surface roughness of the steel plate waterstop until the roughness reaches between 50 and 55 microns;

[0061] Step S2, fiber web laying: titanium dioxide, antioxidant, naphthenic oil, and petroleum resin are added to a reaction vessel respectively, and the temperature is increased until the petroleum resin is melted; rubber is added in batches and stirred thoroughly until the rubber is completely melted to obtain a molten hot melt adhesive;

[0062] The polished steel plate waterstop is placed in a forming mold, polyurethane is placed on the surface of the steel plate waterstop, hot melt adhesive mixed with ethylene-vinyl acetate copolymer is injected, and silicone oil paper is used to cover it to obtain a steel plate waterstop covered with a fiber mesh;

[0063] Step S3, polymer layer coating: dispersing epoxy resin, fluorocarbon resin and polyurethane in xylene solvent and mixing them uniformly to obtain a coating substrate; adding glass flakes soaked in a silane coupling agent / ethanol solution; mixing the glass flakes, the silane coupling agent / ethanol solution and the coating substrate, and ultrasonically dispersing them; adding a curing agent, stirring and mixing uniformly to obtain a polymer coating;

[0064] The polymer coating is sprayed on the surface of the steel plate waterstop strip coated with the fiber mesh obtained in step S2, with a spraying thickness of 1.2 mm, and is calendered, defoamed and compacted at an angle of 30-60° along the surface of the waterstop strip by a pressure roller, and cured at room temperature for 36 hours.

[0065] Example 4

[0066] The difference between this embodiment and embodiment 3 is that petroleum resin is 30 parts, rubber is 55 parts, naphthenic oil is 25 parts, antioxidant is 0.5 parts, and titanium dioxide is 1 part. Except for the different hot melt adhesive components, other process conditions are the same.

[0067] Example 5

[0068] The difference between this embodiment and Example 3 is that the polymer coating does not use fluorocarbon resin. Specifically, the polymer coating includes 16 parts of epoxy resin, 18 parts of polyurethane, 35 parts of glass flakes, 4 parts of silane coupling agent, 1.5 parts of curing agent, and 20 parts of solvent; the silane coupling agent is a mixture of KH-550 silane coupling agent and KH-901 silane coupling agent in a mass ratio of 3:2.

[0069] Example 6

[0070] The difference between this embodiment and Example 3 is that the polymer coating does not use polyurethane. Specifically, the polymer coating includes 16 parts of epoxy resin, 5 parts of fluorocarbon resin, 35 parts of glass flakes, 4 parts of silane coupling agent, 1.5 parts of curing agent, and 20 parts of solvent; the silane coupling agent is a mixture of KH-550 silane coupling agent and KH-901 silane coupling agent in a mass ratio of 3:2.

[0071] Example 7

[0072] The difference between this embodiment and embodiment 3 is that the polymer coating does not use glass flakes, and the polymer coating includes 16 parts of epoxy resin, 5 parts of fluorocarbon resin, 18 parts of polyurethane, 4 parts of silane coupling agent, 1.5 parts of curing agent, and 20 parts of solvent.

[0073] Example 8

[0074] The difference between this embodiment and embodiment 3 is that the polymer coating only uses KH-550 silane coupling agent.

[0075] Example 9

[0076] The difference between this embodiment and Example 3 is that the waterproof and anti-corrosion waterstop for construction joints includes a core material and a polymer coating; no fiber mesh is used between the core material and the polymer coating; the thickness of the polymer coating is the sum of the thickness of the fiber mesh and the polymer coating in Example 3.

[0077] Example 10

[0078] The difference between this embodiment and embodiment 3 is that in a method for preparing a waterproof and anti-corrosion waterstop for construction joints, the steel plate waterstop is polished: the steel plate waterstop is polished with a grinding wheel, and the surface roughness of the steel plate waterstop is tested until the roughness reaches between 50 and 55 microns; and the mixed solution prepared by ethanol, water, and silane coupling agent is not sprayed.

[0079] The waterstops prepared in Examples 1-10 above were subjected to tests on physical and mechanical properties, waterproof and sealing properties, corrosion resistance, durability and environmental adaptability, specifically tensile strength and elongation (ASTM D412 / D638), peel strength (ASTM D903), hardness test (ASTM D2240), static water pressure test (GB / T 18173.3), dynamic watertightness test (EN1021), salt spray test (ASTM B117), chemical medium immersion (GB / T 11547), thermal aging test (GB / T 7141), and low-temperature bendability (GB / T 328.15) tests.

[0080] The test performance table is as follows:

[0081]

[0082] As can be seen from the above table, the waterstops prepared in the examples all meet the physical and mechanical properties, waterproof and sealing properties, corrosion resistance, durability and environmental adaptability tests. The waterstops have good strength and bending resistance, can effectively prevent the coating from being damaged during construction, have good anti-corrosion and waterproof properties, and are highly resistant to weathering and seepage. Through the coordinated design of steel plates, fiber meshes, and polymer coatings, mechanical strength and chemical protection are taken into account. By significantly improving the adhesion with subsequent coatings, the fiber mesh layer acts as a stress buffer to reduce the risk of peeling between the steel plate and the coating due to temperature difference deformation. The peeling strength is tested to be ≥5MPa. Single-factor experiments are also conducted to analyze the polymer coating without the use of fluorocarbon resin, polyurethane, and glass flakes. It can be seen that the polymer coating is uniformly dispersed through the coordinated curing of epoxy resin and polyurethane, supplemented by the weather resistance of fluorocarbon resin, and the glass flakes are pre-treated with a silane coupling agent to ensure a dense and defect-free coating with good tensile strength, high hardness, and low peeling risk.

[0083] With the above-mentioned ideal embodiment of the present invention as inspiration, and through the above description, relevant personnel can make various changes and modifications without departing from the scope of the technical concept of this invention patent. The technical scope of this invention patent is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. Waterproof and anti-corrosion waterstop for construction joints, characterized by: Including core material, fiber mesh and polymer coating on the surface of the core material; The core material is a steel plate waterstop; The fiber web comprises polyurethane fibers, ethylene-vinyl acetate copolymer, and hot melt adhesive; The polymer coating comprises 15-20 parts of epoxy resin, 5-10 parts of fluorocarbon resin, 15-20 parts of polyurethane, 30-45 parts of glass flakes, 2-5 parts of silane coupling agent, 1-2 parts of curing agent and 20 parts of solvent; The mass ratio of the ethylene-vinyl acetate copolymer to the hot melt adhesive is (2-5):1; the warp and weft density of the polyurethane fibers in the fiber web on the core material is 100-150 fibers per square centimeter; The silane coupling agent is a mixture of KH-550 silane coupling agent and KH-901 silane coupling agent; The surface roughness of the steel plate waterstop is between 40 and 60 microns; The method for preparing the waterproof and anti-corrosion waterstop for construction joints comprises the following steps: Step S1, grinding the steel plate waterstop: after grinding the steel plate waterstop with a grinding wheel, evenly spray a mixed solution prepared by ethanol, water, and silane coupling agent on its surface, wet it for 20-40 minutes, and detect the surface roughness of the steel plate waterstop; the mass ratio of ethanol: water: silane coupling agent used in the grinding of the steel plate waterstop is (5-8): (2-3): 1; Step S2, fiber mesh laying: placing the polished steel plate waterstop in a forming mold, placing polyurethane pre-placed on the surface of the steel plate waterstop, injecting hot melt adhesive mixed with ethylene-vinyl acetate copolymer, and covering with silicone oil paper to obtain a steel plate waterstop covered with a fiber mesh; Step S3, polymer layer coating: spray the polymer coating on the surface of the steel plate waterstop strip coated with the fiber mesh obtained in step S2, with a spraying thickness of 0.8-1.5mm, and use a pressure roller to calender, defoam and compact along the surface of the waterstop strip at an angle of 30-60°, and cure at room temperature for 24-48 hours.

2. The waterproof and anti-corrosion waterstop for construction joints according to claim 1, characterized in that: The hot melt adhesive comprises the following components by weight: 30-35 parts of petroleum resin, 45-55 parts of rubber, 18-25 parts of naphthenic oil, 0.5-1 part of antioxidant, and 1-3 parts of titanium dioxide.

3. The waterproof and anti-corrosion waterstop for construction joints according to claim 1, characterized in that: The preparation method of the hot melt adhesive is as follows: titanium dioxide, antioxidant, naphthenic oil and petroleum resin are added into a reaction container respectively, and the temperature is increased until the petroleum resin is melted; rubber is added in batches and stirred thoroughly, and after the rubber is completely melted, a molten hot melt adhesive is obtained.

4. The waterproof and anti-corrosion waterstop for construction joints according to claim 1, characterized in that: The polymer coating is prepared by dispersing epoxy resin, fluorocarbon resin and polyurethane in xylene solvent and mixing them evenly to obtain a coating substrate; adding glass flakes soaked in a silane coupling agent / ethanol solution; mixing the glass flakes, the silane coupling agent / ethanol solution and the coating substrate, and performing ultrasonic dispersion; Add curing agent, stir and mix evenly to obtain polymer coating.

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