Waterproof anti-corrosion waterstop for construction joint and preparation method of waterproof anti-corrosion waterstop

Abstract

The invention belongs to the technical field of building waterproofing, and relates to a waterproof and anti-corrosion waterstop for a construction joint and a preparation method of the waterproof and anti-corrosion waterstop. The waterproof and anti-corrosion water stop belt for the construction joint comprises a core material, and a fiber net and a polymer coating which are arranged on the surface of the core material; the fiber net comprises polyurethane fibers, an ethylene-vinyl acetate copolymer and a hot melt adhesive; the polymer coating comprises epoxy resin, fluorocarbon resin, polyurethane, glass flakes, a silane coupling agent, a curing agent and a solvent; the preparation process comprises the following steps: grinding the steel plate water-stop belt by a grinding wheel, and uniformly spraying a mixed solution prepared from ethanol, water and a silane coupling agent on the surface of the steel plate water-stop belt; the method comprises the following steps: pre-placing polyurethane on the surface of a steel plate water-stop belt, and injecting a hot melt adhesive mixed with an ethylene-vinyl acetate copolymer to form a fiber net; spraying a polymer coating, carrying out angle calendaring, defoaming and compacting, and curing at room temperature. The water-stop belt is good in strength and bending resistance, capable of preventing the coating from being damaged in the construction process, good in corrosion resistance and waterproof performance and high in weather resistance and impermeability.

Description

Technical Field

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

[0002] In building engineering, a construction joint is a joint formed due to the need for segmented pouring during the concrete pouring process. Due to the discontinuity of concrete at the construction joint, it is prone to become a weak link in waterproofing. Waterstop belts are widely used in building engineering due to their relatively high waterproof reliability. The waterproof structure of construction joints generally preferably uses embedded waterstop belts for waterproofing prevention. Currently, commonly used embedded waterstop belts for construction joints include steel-edge rubber waterstop belts, galvanized steel plate waterstop belts, self-adhesive butyl rubber steel plate waterstop belts, etc. These construction joint waterstop belts have a series of problems to varying degrees, such as high construction difficulty, difficult to ensure durability, low bonding strength with post-poured concrete resulting in poor waterproof effect, high cost, etc., resulting in the phenomenon of leakage in nine out of ten joints often occurring, greatly disturbing waterproof design and construction. Especially in an environment that is long-term wet and has corrosive media, the waterstop belt is prone to problems such as aging and corrosion, leading to a decline in the waterproof effect and affecting the structural safety and service life of the building. Therefore, developing a waterstop belt with good waterproof and anticorrosive properties has important practical significance. Summary of the Invention

[0003] The technical problem to be solved by the invention is: aiming at the above defects, the invention provides a waterproof and anticorrosive waterstop belt for construction joints. By coating a fiber mesh on the surface of the core material and coating a polymer coating on the outer surface layer, the waterstop belt has good strength and anti-bending performance, can prevent the coating from being damaged during the construction process, has good anticorrosive and waterproof properties, and high weather resistance and impermeability.

[0004] The technical solution adopted by the invention to solve its technical problem is as follows: The waterproof and anticorrosive waterstop belt 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 belt; the fiber mesh includes polyurethane fiber, 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. The fiber mesh plays a protective role for the core material, isolating the steel plate from contact with corrosion environments such as moisture and chemical media, extending the service 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, enhancing the tensile and impact resistance performance of the embedded waterstop during use and being not easily cracked 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 the hot melt adhesive in the fiber mesh both have adhesive effects, with high connection strength and the polymer coating not easily falling off, and the reliability of the anti-corrosion and waterproof performance is good.

[0006] Secondly, the polymer coating is 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 contacting the epoxy resin, the epoxy functional groups open and react with the hydroxyl groups on the fluorocarbon resin to form a crosslinked network, synergistically improving the corrosion resistance, weather resistance, and mechanical properties. The glass flakes, as fillers, improve the interfacial bonding force with the resin matrix through silane coupling agents. On the one hand, the use of fillers is reduced. On the other hand, the glass flakes are arranged in a laminated manner and doped in the crosslinked network of the coating resin matrix to improve the water resistance of the surface of the cured polymer coating, and the anti-permeation and corrosion resistance are improved. The materials used in the polymer coating cooperate with each other, with a fast curing speed, and the three-dimensional structure formed after curing is stable and reliable, having high performance such as heat resistance, aging resistance, acid and alkali resistance, and environmental protection, providing good protection for the core material, and the coating and the fiber mesh are not damaged under the conditions of bending and collision, and the service life of the waterstop is long.

[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, the ethylene-vinyl acetate copolymer (EVA) itself has adhesive properties. By controlling the mass ratio with the hot melt adhesive, the polarity of EVA and the fluidity of the hot melt adhesive are retained, with strong interfacial adaptability, a moderate curing speed, and high coating and core material surface bonding strength for the polyurethane fiber.

[0009] Furthermore, the hot melt adhesive comprises the following weight components: 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 mixed together.

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

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

[0012] Through the above technical solution, by controlling the warp and weft density of polyurethane fibers in the fiber web on the surface of the core material, the distribution is reasonable. 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 anti-bending performance 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, by using KH-550 and KH-901 silane coupling agents, the adhesion between the compounded resin matrix, glass flakes and the surface of the fiber web is synergistically enhanced. The chemical action is good, the components within the polymer coating and the bonding force between the polymer coating and the outer surface of the fiber web are good, and the performance is high.

[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., the core material), the adhesion between the fiber web, the polymer coating and the surface of the core material is significantly improved.

[0017] A preparation method for a waterproof and anticorrosive waterstop for construction joints includes the following operating steps. Step S1, grinding of the steel plate waterstop: After grinding the steel plate waterstop with a grinding wheel, a mixed solution prepared from ethanol, water and silane coupling agent is evenly sprayed on its surface, and it is wetted for 20 - 40 min, and the surface roughness of the steel plate waterstop is detected. Step S2, laying of the fiber web: The ground steel plate waterstop is placed in a forming mold, the polyurethane is pre-placed on the surface of the steel plate waterstop, hot melt adhesive mixed with ethylene-vinyl acetate copolymer is injected, and it is covered with siliconized paper to obtain a steel plate waterstop coated with a fiber web. Step S3, coating of the polymer layer: The polymer coating is sprayed on the surface of the steel plate waterstop coated with a fiber web obtained in Step S2, the spraying thickness is 0.8 - 1.5 mm, and it is calendered and defoamed and compacted at an angle of 30 - 60° along the surface of the waterstop by a calender roll, and cured at room temperature for 24 - 48 h.

[0018] Through the above technical scheme, the surface area is increased by grinding with a grinding wheel, and the adhesion between the steel plate waterstop and the subsequent coating is significantly improved by treating with a silane coupling agent. The polyurethane fibers in the fiber mesh provide skeleton support, and the composite 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 directional manner to form a maze-like anti-corrosion barrier, and the silane coupling agent enhances the interface compatibility.

[0019] In addition, silicone oil paper is used to cover to avoid colloid sagging and ensure that there are no bubbles between the fiber mesh and the steel plate. The melting and blending temperature of EVA and hot melt adhesive needs to be controlled to prevent thermal degradation. The coating of the polymer coating adopts angle calendering. The tilt angle of the pressure roller reduces the shear force, promotes the directional arrangement of glass flakes, and improves the impermeability of the coating.

[0020] Furthermore, the mass ratio of ethanol: water: silane coupling agent used in the grinding of the steel plate waterstop is (5-8): (2-3): 1. The rapid volatilization of ethanol promotes the self-assembly of silane on the surface of the steel plate to form a film, and water is used as a hydrolysis medium to form a Si-O-Si network structure, thereby enhancing the chemical bonding with the coating, controlling the hydrolysis concentration of the silane solution, and controlling the synergistic effect between the silane and the surface of the steel plate waterstop, thereby improving the adhesion and corrosion resistance of the fiber mesh, polymer coating and the steel plate waterstop.

[0021] 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 sufficiently, and after the rubber is completely melted, a molten hot melt adhesive is obtained.

[0022] Furthermore, the preparation method of the polymer coating is as follows: epoxy resin, fluorocarbon resin and polyurethane are dispersed in xylene solvent, and the coating substrate is obtained after being mixed evenly; glass flakes soaked in silane coupling agent / ethanol solution are added; glass flakes, silane coupling agent / ethanol solution and coating substrate are mixed and ultrasonically dispersed; curing agent is added, and the mixture is stirred and mixed evenly to obtain a polymer coating. Ultrasonic dispersion can ensure that the flakes are evenly distributed in the resin to avoid sedimentation.

[0023] In summary, the beneficial effects of the present invention are: 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 zone 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.

[0024] 2. The polymer coating is cured synergistically by epoxy resin and polyurethane, supplemented by the weather resistance of fluorocarbon resin. The glass flakes are pretreated with silane coupling agent to achieve uniform dispersion, ensuring that the coating is dense and defect-free.

[0025] 3. The 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.

[0026] 4. This kind of construction joint waterproof, anticorrosive and water stop belt has good strength and anti-bending performance of the water stop belt, can effectively prevent the coating from being damaged during the construction process, has good anticorrosive and waterproof performance, and high weather resistance and impermeability performance. Specific Embodiments

[0027] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following examples are used to further elaborate on the present invention in detail. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] Example 1 The waterproof, anticorrosive and water stop belt 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 water stop belt, and the surface roughness of the steel plate water stop belt is between 40 and 45 microns; 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.

[0029] The fiber mesh includes polyurethane fiber, ethylene-vinyl acetate copolymer, and hot melt adhesive; specifically, the usage amount of polyurethane fiber is that the warp and weft density on the core material is 100 roots per square centimeter for standard laying, and the mass ratio of ethylene-vinyl acetate copolymer to hot melt adhesive is 2:1; 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. In this example, the curing agent is selected as 4,4'-diaminodiphenylmethane.

[0030] A preparation method of a waterproof, anticorrosive and water stop belt for construction joints, weighing the above weights and preparing materials, includes the following operation steps, Step S1, grinding of the steel plate water stop belt: After grinding the steel plate water stop belt with a grinding wheel, a mixed solution prepared from ethanol, water, and silane coupling agent is evenly sprayed on its surface. The mass ratio of ethanol: water: silane coupling agent used for grinding the steel plate water stop belt is 5:3:1; wet for 20 min, and detect the surface roughness of the steel plate water stop belt until the roughness reaches between 40 and 45 microns; Step S2, Fiber Mesh Laying: Add titanium dioxide, antioxidant, naphthenic oil, and petroleum resin into a reaction vessel respectively, and heat up until the petroleum resin melts; add rubber in batches, stir well, and after the rubber completely melts, obtain hot melt adhesive in a molten state; Place the polished steel plate waterstop in a forming mold, preset polyurethane on the surface of the steel plate waterstop, inject hot melt adhesive mixed with ethylene-vinyl acetate copolymer, and cover it with siliconized paper to obtain a steel plate waterstop coated with a fiber mesh; Step S3, Polymer Layer Coating: Disperse epoxy resin, fluorocarbon resin, and polyurethane in xylene solvent, and obtain a coating substrate after mixing evenly; add glass flakes soaked in a silane coupling agent / ethanol solution; mix the glass flakes, silane coupling agent / ethanol solution, and coating substrate, and perform ultrasonic dispersion; add a curing agent, stir and mix evenly to obtain a polymer coating; Spray the polymer coating on the surface of the steel plate waterstop coated with a fiber mesh obtained in Step S2, with a spraying thickness of 0.8 mm, press and polish at a 60° angle along the surface of the waterstop by a pressure roller to remove bubbles and compact, and cure at room temperature for 48 h.

[0031] Example 2 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; 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 part of antioxidant, and 1 part of titanium dioxide.

[0032] The fiber mesh includes polyurethane fiber, ethylene-vinyl acetate copolymer, and hot melt adhesive; specifically, the usage amount of polyurethane fiber is 150 roots per square centimeter in the warp and weft density on the core material for standard laying, and the mass ratio of ethylene-vinyl acetate copolymer to hot melt adhesive is 5:1; 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 selected in this example is toluene diisocyanate.

[0033] A preparation method of a waterproof and anti-corrosion waterstop for construction joints, weigh the above weights, prepare materials, and include the following operation steps, Step S1, grinding of the steel plate waterstop: After grinding the steel plate waterstop with a grinding wheel, a mixed solution prepared from ethanol, water, and a silane coupling agent is evenly sprayed on its surface. When grinding the steel plate waterstop, the mass ratio of ethanol: water: silane coupling agent is 8:2:1; wet it for 40 minutes and detect the surface roughness of the steel plate waterstop until the roughness reaches between 55 and 60 microns; Step S2, laying of the fiber mesh: Add titanium dioxide, antioxidant, naphthenic oil, and petroleum resin into a reaction vessel respectively, and heat up until the petroleum resin melts; add rubber in batches and stir well. After the rubber completely melts, a hot melt adhesive in a molten state is obtained; Place the ground steel plate waterstop in a forming mold, preset the polyurethane on the surface of the steel plate waterstop, inject the hot melt adhesive mixed with ethylene-vinyl acetate copolymer, and cover it with siliconized paper to obtain a steel plate waterstop coated with a fiber mesh; Step S3, coating of the polymer layer: Disperse epoxy resin, fluorocarbon resin, and polyurethane in xylene solvent, and obtain a coating substrate after mixing evenly; add glass flakes soaked in a silane coupling agent / ethanol solution; mix the glass flakes, the silane coupling agent / ethanol solution, and the coating substrate, and perform ultrasonic dispersion; add a curing agent and stir to mix evenly to obtain a polymer coating; Spray the polymer coating on the surface of the steel plate waterstop coated with a fiber mesh obtained in Step S2, with a spraying thickness of 1.5 mm. Press and smooth it at an angle of 30 - 60° along the surface of the waterstop with a pressure roller to remove bubbles and compact it, and cure it at room temperature for 24 hours.

[0034] Example 3 The waterproof, anticorrosive and 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.

[0035] 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 part of antioxidant, and 2 parts of titanium dioxide.

[0036] The fiber mesh includes polyurethane fiber, ethylene-vinyl acetate copolymer, and hot melt adhesive; specifically, the usage amount of polyurethane fiber is that the warp and weft density on the core material is 100 - 150 roots per square centimeter for standard laying, and the mass ratio of ethylene-vinyl acetate copolymer to hot melt adhesive is 4:1; 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 uses 4,4'-diaminodiphenylmethane.

[0037] A preparation method of a waterproof, anticorrosive and waterstop belt for construction joints. Weigh the above weights and prepare the materials, including the following operating steps. Step S1, grinding of the steel plate waterstop belt: After grinding the steel plate waterstop belt with a grinding wheel, a mixed solution prepared from ethanol, water, and silane coupling agent is evenly sprayed on its surface. The mass ratio of ethanol: water: silane coupling agent used during the grinding of the steel plate waterstop belt is 6.5:2.5:1; wet it for 30 min, and detect the surface roughness of the steel plate waterstop belt until the roughness reaches between 50 and 55 microns. Step S2, laying of the fiber mesh: Add titanium dioxide, antioxidant, naphthenic oil, and petroleum resin into the reaction vessel respectively, and heat up until the petroleum resin melts; add rubber in batches and stir well. After the rubber is completely melted, a hot melt adhesive in a molten state is obtained. Place the ground steel plate waterstop belt in the forming mold, preset the polyurethane on the surface of the steel plate waterstop belt, inject the hot melt adhesive mixed with ethylene-vinyl acetate copolymer, and cover it with siliconized paper to obtain a steel plate waterstop belt coated with a fiber mesh. Step S3, coating of the polymer layer: Disperse epoxy resin, fluorocarbon resin, and polyurethane in xylene solvent, and obtain a coating substrate after mixing evenly; add glass flakes soaked in silane coupling agent / ethanol solution; mix the glass flakes, silane coupling agent / ethanol solution, and coating substrate, and disperse them ultrasonically; add a curing agent and stir and mix evenly to obtain a polymer coating. Spray the polymer coating on the surface of the steel plate waterstop belt coated with a fiber mesh obtained in Step S2, with a spraying thickness of 1.2 mm. Press and smooth it at an angle of 30 - 60° along the surface of the waterstop belt with a pressing roller to remove bubbles and compact it, and cure it at room temperature for 36 h.

[0038] Example 4 The difference between this example and Example 3 is that there are 30 parts of petroleum resin, 55 parts of rubber, 25 parts of naphthenic oil, 0.5 part of antioxidant, and 1 part of titanium dioxide. Except for the different components of the hot melt adhesive, other process conditions are the same.

[0039] Example 5 The difference between this example and Example 3 is that the fluorocarbon resin is not used in the polymer coating. 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.

[0040] Example 6 The difference between this embodiment and Embodiment 3 is that polyurethane is not used in the polymer coating. 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.

[0041] Embodiment 7 The difference between this embodiment and Embodiment 3 is that glass flakes are not used in the polymer coating. 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.

[0042] Embodiment 8 The difference between this embodiment and Embodiment 3 is that only KH-550 silane coupling agent is used in the polymer coating.

[0043] Embodiment 9 The difference between this embodiment and Embodiment 3 is that the waterproof and anticorrosive waterstop for construction joints includes a core material and a polymer coating; a fiber mesh is not used between the core material and the polymer coating; the thickness of the polymer coating is the same as the sum of the thicknesses of the fiber mesh and the polymer coating in Embodiment 3.

[0044] Embodiment 10 The difference between this embodiment and Embodiment 3 is that in a method for preparing a waterproof and anticorrosive 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 detected until the roughness reaches between 50 and 55 microns; a mixed solution prepared by spraying ethanol, water, and silane coupling agent is not used.

[0045] For the waterstops prepared in the above Embodiments 1-10, physical and mechanical properties, waterproof and sealing properties, corrosion resistance, durability, and environmental adaptability tests are carried out, specifically including tensile strength and elongation (ASTM D412 / D638), peel strength (ASTM D903), hardness test (ASTM D2240), static hydrostatic pressure test (GB / T 18173.3), dynamic water tightness test (EN1021), salt spray test (ASTM B117), chemical medium immersion (GB / T 11547), heat aging test (GB / T 7141), and low temperature bending property (GB / T 328.15) tests.

[0046] The test performance table is as follows:

[0047] 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 anti-bending performance, can effectively prevent coating damage during construction, have good anti-corrosion and waterproof performance, and high weather resistance and impermeability. Through the collaborative design of steel plates, fiber meshes, and polymer coatings, both mechanical strength and chemical protection are taken into account. By significantly improving the adhesion to the subsequent coating, the fiber mesh layer serves as a stress buffer zone, reducing the peeling risk caused by temperature difference deformation between the steel plate and the coating. After testing, the peeling strength is ≥5 MPa. Through single-factor experiments on the non-use of fluorocarbon resin, polyurethane, and glass flakes in the polymer coating, it can be seen that the polymer coating is cured synergistically by epoxy resin and polyurethane, supplemented by the weather resistance of fluorocarbon resin. The glass flakes are pretreated with silane coupling agent to achieve uniform dispersion, ensuring that the coating is dense and defect-free, with good tensile strength, high hardness, and low peeling risk.

[0048] Inspired by the above ideal embodiments of the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention patent. The technical scope of this invention patent is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. Waterproof and anti-corrosion waterstop for construction joints, characterized in that: 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.

2. The waterproof and anti-corrosion waterstop for construction joints according to claim 1, characterized in that: The mass ratio of the ethylene-vinyl acetate copolymer to the hot melt adhesive is (2-5):

1.

3. 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 cyclohexane oil, 0.5-1 parts of antioxidant and 1-3 parts of titanium dioxide.

4. The waterproof and anti-corrosion waterstop for construction joints according to claim 1, characterized in that: The warp and weft density of the polyurethane fibers in the fiber net on the core material is 100-150 fibers per square centimeter.

5. The waterproof and anti-corrosion waterstop for construction joints according to claim 1, characterized in that: The silane coupling agent is a mixture of KH-550 silane coupling agent and KH-901 silane coupling agent.

6. The waterproof and anti-corrosion waterstop for construction joints according to claim 1, characterized in that: The surface roughness of the steel plate waterstop is between 40 and 60 microns.

7. The method for preparing a waterproof and anticorrosive waterstop for construction joints according to any one of claims 1 to 6, comprising 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; Step S2, fiber mesh laying: placing the polished steel plate waterstop in a forming mold, placing polyurethane 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 coated 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.

8. The waterproof and anti-corrosion waterstop for construction joints according to claim 7, characterized in that: The mass ratio of ethanol: water: silane coupling agent used in grinding the steel plate waterstop is (5-8): (2-3):

1.

9. The waterproof and anti-corrosion waterstop for construction joints according to claim 7, characterized in that: The preparation method of the hot melt adhesive is as follows: titanium dioxide, antioxidant, cyclohexane 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 sufficiently, and after the rubber is completely melted, a molten hot melt adhesive is obtained.

10. The waterproof and anti-corrosion waterstop for construction joints according to claim 7, characterized in that: The preparation method of the polymer coating is as follows: dispersing epoxy resin, fluorocarbon resin and polyurethane in a 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 ultrasonically dispersing them; Add curing agent, stir and mix evenly to obtain polymer coating.

Images