Broadband damping composite system and construction method and application

Abstract

This invention relates to the field of vibration reduction system technology, specifically to a broadband damping composite system, its construction method, and its application. The broadband damping composite system comprises a viscoelastic damping layer, an adhesive layer, and a magnesium alloy restraint layer; the viscoelastic damping layer is made of butyl rubber, acrylate polymer, or polyurethane. This invention also provides a construction method for the broadband damping composite system, including the following steps: bonding the viscoelastic damping layer and the magnesium alloy restraint layer together using an adhesive layer to obtain the broadband damping composite system. This invention further provides an application of the broadband damping composite system obtained by this construction method in steel structure floor slabs. This invention solves the problem that existing building damping systems struggle to simultaneously achieve high energy efficiency, extreme lightweight design, broadband adaptability, and ease of implementation.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction system technology, specifically to a broadband damping composite system, its construction method, and its application. Background Technology

[0002] As modern architecture develops towards larger spans and lighter weights, the vibration comfort issue of steel structure floor slabs is becoming increasingly prominent. Steel structure floor slabs, represented by widely used profiled steel sheet-concrete composite floor slabs, are extremely sensitive to dynamic excitations such as pedestrian loads and equipment vibrations due to their light weight and low inherent damping. They are prone to generating vibration responses that are long-lasting and slow-decaying, which seriously affects the comfort of building use.

[0003] This problem is particularly prominent in steel structure mezzanine floors (such as secondary additions to LOFT apartments, commercial balconies, and industrial platforms). As a type of post-construction structure, these mezzanines often pursue extreme lightweighting and large-span designs, with their unit area mass typically only about half that of conventional floor slabs. This results in insufficient dynamic stiffness, more significant vibration response than conventional floors, and an urgent need for comfort control.

[0004] Currently, the mainstream technical approaches to improving floor vibration comfort all have significant limitations: First, traditional structural reinforcement methods. Increasing the floor slab mass (e.g., thickening concrete) or adding secondary beams to improve stiffness and mass directly violates lightweight design principles. This not only increases the structural self-weight, leading to increased foundation load and reduced economy, but also limits the effective utilization of building space. Second, prefabricated integrated vibration-damping floor slabs. These are integrated composite floor slabs with built-in vibration-damping units. While such designs (e.g., composite floor slabs with specific periodic structures) can achieve good vibration reduction, they are essentially highly customized prefabricated components with high production costs. Furthermore, they must be integrated in the early stages of building design, making them unsuitable for the vast majority of existing building renovation projects, severely limiting their application scenarios. Third, adding specialized vibration-damping devices such as tuned mass dampers (TMDs). These devices (e.g., TMDs) typically tune to a single natural frequency of the floor slab, resulting in a narrow effective frequency band. When usage conditions change, causing frequency shifts, the vibration-damping effect significantly decreases or even fails, indicating insufficient robustness. At the same time, the installation of the device requires additional space and supporting structure, which affects the building space and aesthetics, and the design, installation and subsequent maintenance costs are also relatively high.

[0005] In summary, existing technologies struggle to simultaneously meet the comprehensive requirements of high energy efficiency, extreme lightweight design, wide bandwidth adaptability, and ease of implementation. Therefore, developing a novel damping system that balances high energy efficiency, extreme lightweight design, wide bandwidth adaptability, and ease of implementation is of significant engineering and theoretical value for promoting the development of steel structure buildings, especially lightweight sandwich structures. Summary of the Invention

[0006] In view of this, the purpose of this invention is to provide a broadband damping composite system, its construction method, and its application, so as to solve the problem that existing building damping systems cannot simultaneously achieve high energy efficiency, extreme lightweight, broadband adaptability, and ease of implementation.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A broadband damping composite system is composed of a viscoelastic damping layer, an adhesive layer, and a magnesium alloy constraint layer; The viscoelastic damping layer is made of butyl rubber, acrylate polymer or polyurethane material.

[0008] Based on the aforementioned technical methods, by using a high-stiffness, high-internal-loss magnesium alloy to replace traditional steel as the magnesium alloy confinement layer, the magnesium alloy confinement layer not only efficiently confines the shear deformation energy dissipation generated by the viscoelastic damping layer, but also contributes additional damping itself, thus forming a synergistic broadband energy dissipation mechanism. This broadband damping composite system achieves a balance between high-efficiency vibration reduction and extremely low added mass, making it particularly suitable for load-sensitive large-span lightweight steel structure floor slabs and vibration control of existing mezzanine structures. It boasts advantages such as convenient construction and strong adaptability. It effectively solves the problem that existing building damping systems struggle to simultaneously achieve high energy dissipation, extreme lightweighting, broadband adaptability, and ease of implementation. Furthermore, this broadband damping composite system is suitable not only for new structures but also for the renovation of existing structures, offering convenient installation, flexible strategies, and the option of overall or partial installation.

[0009] Preferably, the magnesium alloy confinement layer consists of a magnesium alloy body and a ceramic oxide layer disposed on the surface of the magnesium alloy body; The magnesium alloy body is made of AZ31B magnesium alloy sheet, AZ91D magnesium alloy sheet or ZK60 magnesium alloy sheet.

[0010] The specific damping capacity of AZ31B magnesium alloy plates, AZ91D magnesium alloy plates, or ZK60 magnesium alloy plates is significantly higher than that of ordinary structural steel, meaning they have high internal friction characteristics.

[0011] The AZ31B magnesium alloy sheet contains, by mass percentage: 2.5-3.5% aluminum (Al), 0.6-1.4% zinc (Zn), 0.2-1.0% manganese (Mn), with the balance being magnesium (Mg). The impurity elements in the AZ31B magnesium alloy sheet are: silicon (Si) ≤0.10%, iron (Fe) ≤0.005%, copper (Cu) ≤0.05%, nickel (Ni) ≤0.005%, and calcium (Ca) ≤0.04%.

[0012] The material composition of AZ91B magnesium alloy sheet, by mass percentage, includes: 8.5~9.5% aluminum (Al), 0.45~0.90% zinc (Zn), 0.17~0.40% manganese (Mn), with the balance being magnesium (Mg). The impurity elements in AZ91B magnesium alloy sheet are: silicon (Si) ≤0.05%, iron (Fe) ≤0.004%, copper (Cu) ≤0.025%, and nickel (Ni) ≤0.001%.

[0013] The material composition of ZK60 magnesium alloy sheet, by mass percentage, includes: 5.0~6.0% aluminum (Al), 0.45~0.8% zirconium (Zr), and the balance is magnesium (Mg).

[0014] Preferably, the magnesium alloy body undergoes micro-arc oxidation surface treatment to form a ceramic oxide layer on the surface of the magnesium alloy body, thereby obtaining the magnesium alloy constraint layer.

[0015] Preferably, the yield strength of the magnesium alloy confinement layer is not less than 160 MPa.

[0016] Preferably, the thickness of the magnesium alloy constraint layer is 2~6mm.

[0017] Among them, magnesium alloys have the following unique advantages in vibration reduction of building floor slabs: 1) The elastic modulus of magnesium alloys is about 45 GPa, and the density is about 1.78 g / cm³. 3 Magnesium alloy has a much higher specific stiffness (the ratio of elastic modulus to density) than steel. To provide the same constraint stiffness, the required mass of the magnesium alloy constraint layer is only about 23% of that of a traditional steel constraint layer. This characteristic perfectly matches the "lightweight" requirement of steel structure floor slabs (especially load-sensitive mezzanines), achieving efficient additional damping while generating almost no additional gravity load on the main structure, fundamentally solving the inherent contradiction of "increasing weight for vibration reduction" in traditional solutions. 2) Magnesium alloy has a much higher inherent damping capacity than ordinary structural steel (such as Q235), with a typical loss factor above 0.01, while structural steel is usually below 0.001. In this system, the magnesium alloy constraint layer not only passively provides stiffness but also actively adds broadband energy dissipation elements. It and the viscoelastic damping layer form a unique "parallel synergistic energy dissipation" mechanism in dynamics. The two respond together to vibration inputs of different frequencies and amplitudes, significantly broadening and enhancing the overall energy dissipation bandwidth and efficiency of the system, achieving a composite vibration reduction effect of "1+1>2". 3) The main frequency band of pedestrian excitation on building floor slabs is typically distributed in the range of 2~8Hz. The maximum energy dissipation frequency range of this composite system can effectively cover this critical frequency band, thereby achieving efficient and targeted control of target vibration.

[0018] Preferably, the butyl rubber is selected from high-damping butyl rubber sheets, and the high-damping butyl rubber sheets are commercially available high-damping butyl rubber products, such as Snugdamp 201A damping sheets produced by Hangzhou Zhijiang Organosilicon Chemical Co., Ltd., and anti-corrosion sealing and noise reduction damping materials produced by Changzhou Lanjin Rubber & Plastic Co., Ltd.

[0019] Preferably, the acrylate polymer is selected from pressure-sensitive adhesives or damping materials from 3M Company; the acrylate polymer composition, by weight, includes: 50-70 parts of monohydric alcohol acrylate soft monomer, 20-40 parts of nonpolar olefin unsaturated hard monomer and 3-8 parts of polar olefin unsaturated functional monomer, and the glass transition temperature Tg of the acrylate polymer is -40℃ to -20℃.

[0020] Preferably, the monohydric alcohol acrylate soft monomer is selected from isooctyl acrylate (2-EHA), and the glass transition temperature of the homopolymer of isooctyl acrylate (2-EHA) is Tg≈-70℃.

[0021] Preferably, the nonpolar olefin unsaturated hard monomer is selected from vinyl acetate (VAc), wherein the solubility parameter of the vinyl acetate (VAc) is ≤10.5 and the homopolymer Tg≈22℃.

[0022] Preferably, the polar olefin unsaturated functional monomer is selected from acrylic acid (AA) and / or hydroxyethyl acrylate (HEA).

[0023] Preferably, the polyurethane material is selected from high-damping vibration-damping TPU material.

[0024] Preferably, the polyurethane material is selected from Covestro's DP 2590A high-damping vibration-damping TPU material.

[0025] Preferably, the loss factor of the viscoelastic damping layer is not less than 0.3, and the thickness of the viscoelastic damping layer is 1~3mm.

[0026] Preferably, the adhesive layer is made of epoxy resin structural adhesive, high-performance high-toughness epoxy resin adhesive, or acrylate structural adhesive.

[0027] By selecting epoxy resin structural adhesive, high-performance high-toughness epoxy resin adhesive, or acrylic structural adhesive as the bonding layer, fatigue resistance and long-term durability are ensured.

[0028] Preferably, the epoxy resin structural adhesive is a two-component epoxy resin adhesive, specifically Loctite EA 9492 or other similar products. The volume ratio of resin to curing agent in the two-component epoxy resin adhesive is 2:1. The initial curing time at room temperature is 75 minutes, and complete curing takes 3 days. The working temperature range is -40℃ to 180℃, and the tensile strength is ≥31 N / mm². 2 After curing, it has a Shore hardness of 80D, extremely low outgassing characteristics and excellent solvent resistance, and is suitable for bonding a variety of substrates such as metals, plastics and composites.

[0029] Preferably, the high-performance, high-toughness epoxy resin adhesive is a toughened two-component epoxy structural adhesive, the type of which is Loctite EA E-120HP or other similar products. The resin-to-curing agent mass ratio in the toughened two-component epoxy structural adhesive is 2:1. It fully cures at room temperature in 24 hours and has a working temperature range of -40℃ to 150℃. It has excellent impact strength and peel resistance and is suitable for structural bonding of various substrates such as metals, plastics, and ceramics. It is particularly suitable for applications requiring high impact toughness.

[0030] Preferably, the acrylic structural adhesive is a two-component acrylic structural adhesive, and the type of the two-component acrylic structural adhesive can be Tianshan Kesaixin TS828 or other similar products. The volume ratio of resin to curing agent in the two-component acrylic structural adhesive is 10:1. It can initially cure in 4-6 minutes at room temperature, and can reach more than 80% of the final strength in 20 minutes. The working temperature range is -40℃ to 80℃. After curing, it has high strength, good toughness and peel resistance of the adhesive layer, and especially excellent thermal strength performance. It is suitable for bonding various materials such as metal, plastic, leather, rubber, and wood.

[0031] Preferably, the thickness of the adhesive layer is 0.5~1mm.

[0032] This invention also provides a method for constructing a broadband damping composite system, comprising the following steps: By bonding the viscoelastic damping layer and the magnesium alloy constraint layer together, a broadband damping composite system is obtained.

[0033] By combining a lightweight, high-energy-dissipating magnesium alloy confinement layer with a viscoelastic damping layer, a typical confinement-damped structure was constructed. Under external vibration excitation, the magnesium alloy confinement layer provides rigid support and forces the viscoelastic damping layer to undergo significant shear deformation, utilizing the hysteresis loss mechanism of its polymer chain segments to convert mechanical energy into heat dissipation. Simultaneously, the high Young's modulus and low density of the magnesium alloy confinement layer effectively improve the overall stiffness of the composite system without significantly increasing the structural weight, broadening the effective frequency band of the damping layer's shear energy dissipation. The adhesive layer ensures the continuity and synergistic effect of interfacial stress transmission. This composite system integrates the load-bearing function of magnesium alloy with the damping function of viscoelastic materials, overcoming the limitations of narrow temperature and frequency range and low efficiency of single-material damping, achieving a combination of lightweight, wide-bandwidth, high damping, and structural functionality.

[0034] Preferably, before the viscoelastic damping layer and the magnesium alloy constraint layer are combined into one, the method further includes: performing micro-arc oxidation surface treatment on the surface of the magnesium alloy body to obtain the magnesium alloy constraint layer; The specific steps of the micro-arc oxidation surface treatment include: placing the magnesium alloy body in a silicate electrolyte or aluminate electrolyte and treating it using a pulse power mode to form a ceramic oxide layer on the surface of the magnesium alloy body.

[0035] By employing micro-arc oxidation surface treatment to form a ceramic oxide layer on the surface of the magnesium alloy body, the corrosion resistance of the magnesium alloy constraint layer and the adhesion between the magnesium alloy constraint layer and the adhesive layer are effectively improved.

[0036] Preferably, the method for constructing a broadband damping composite system includes the following steps: The specific operational method for bonding the viscoelastic damping layer and the magnesium alloy constraint layer into a single unit via an adhesive layer includes the following steps: The side of the magnesium alloy constraint layer to be bonded is sanded, cleaned, and dried. Then, the adhesive layer is evenly applied to one side of the magnesium alloy constraint layer, and the thickness of the adhesive layer is controlled to be about 0.5~1.0mm. Then, the viscoelastic damping layer is aligned with one side of the magnesium alloy constraint layer and bonded together. Uniform pressure is applied to ensure that the adhesive layer is dense and free of air bubbles, thus obtaining the bonded broadband damping composite system. Subsequently, the bonded broadband damping composite system is pressurized and cured at a temperature of 21~25℃ for at least 24 hours or by using stepped temperature increase curing to improve curing efficiency. After complete curing, it is cured at room temperature for more than 24 hours to obtain the successfully constructed broadband damping composite system.

[0037] Preferably, the silicate electrolyte comprises sodium silicate (Na2SiO3·9H2O), potassium hydroxide (KOH), potassium fluoride (KF), and water, wherein the concentration of sodium silicate in the silicate electrolyte is 10 g / L, the concentration of potassium hydroxide is 2 g / L, and the concentration of potassium fluoride is 2 g / L.

[0038] Preferably, the aluminate electrolyte comprises sodium aluminate (NaAlO2), potassium hydroxide (KOH), sodium tungstate (Na2WO4·2H2O) and water, wherein the concentration of sodium aluminate in the aluminate electrolyte is 8 g / L, the concentration of potassium hydroxide is 1.5 g / L, and the concentration of sodium tungstate is 3 g / L.

[0039] Preferably, the operating parameters for the pulse power supply mode processing are: constant current mode with a current density of 12 A / dm². 2 The electrolyte was processed at 200 Hz for 15 minutes, then switched to 800 Hz for 10 minutes, with a duty cycle of 30%, for a total processing time of 25 minutes. The electrolyte temperature was maintained at 25±5℃. The electrolyte temperature was kept between 25±5℃ by water bath cooling.

[0040] Preferably, the ceramic oxide layer comprises MgO and Mg2SiO4, or MgO and MgAl2O4.

[0041] This invention also provides an application of a broadband damping composite system obtained by the construction method in steel structure floor slabs.

[0042] The broadband damping composite system of the present invention can be used in steel structure floor slabs to significantly improve the comfort of steel structure floor systems under dynamic loads such as pedestrian excitation, and is suitable for lightweight floor slab structures such as profiled steel sheet-concrete composite floor slabs.

[0043] Preferably, the installation method of the broadband damping composite system includes the following steps: An adhesive layer is applied to the mounting base surface formed by the lower flange of the profiled steel sheet of the steel structure floor slab and the viscoelastic damping layer of the broadband damping composite system. Then, the viscoelastic damping layer of the broadband damping composite system is bonded to the mounting base surface formed by the lower flange of the profiled steel sheet, and then cured under pressure to realize the installation of the broadband damping composite system.

[0044] Preferably, the curing pressure is 0.2~0.5 MPa, the temperature is 18~28℃, and the time is 48~72h.

[0045] This invention relates to a broadband damping composite system applied to steel structure floor slabs. It breaks away from the conventional approach of using steel plates as the confinement layer in building vibration reduction, creatively proposing magnesium alloy as the core material for the confinement layer. Its basic mechanical principle is that when the floor slab undergoes bending vibration under load, its mounting surface experiences significant tensile and compressive strain. Through the "clamping" and "displacement" action of the rigid confinement layer and the mounting surface on the intermediate viscoelastic damping layer, the damping layer is forced to undergo substantial shear deformation, thereby irreversibly converting mechanical vibration energy into heat dissipation.

[0046] The beneficial effects of this invention are: This invention's broadband damping composite system replaces traditional steel with a high-stiffness, high-internal-loss magnesium alloy as the magnesium alloy confinement layer. This allows the magnesium alloy confinement layer to not only efficiently confine the shear deformation energy dissipation generated by the viscoelastic damping layer, but also to contribute additional damping itself, thus forming a synergistic broadband energy dissipation mechanism. This broadband damping composite system achieves a balance between efficient vibration reduction and extremely low added mass, making it particularly suitable for load-sensitive large-span lightweight steel structure floor slabs and vibration control of existing mezzanine structures. It offers advantages such as convenient construction and strong adaptability. Furthermore, this broadband damping composite system is suitable not only for new structures but also for the renovation of existing structures, offering convenient installation, flexible strategies, and the option of overall or partial installation.

[0047] The present invention discloses a method for constructing a broadband damping composite system. This system combines a lightweight, high-energy-dissipating magnesium alloy confinement layer with a viscoelastic damping layer to create a typical confined damping structure. Under external vibration excitation, the magnesium alloy confinement layer provides rigid support and forces the viscoelastic damping layer to undergo significant shear deformation, utilizing the hysteresis loss mechanism of its polymer chain segments to convert mechanical energy into heat dissipation. Simultaneously, the high Young's modulus and low density of the magnesium alloy confinement layer effectively improve the overall stiffness of the composite system without significantly increasing the structural weight, broadening the effective frequency band of the damping layer's shear energy dissipation. The adhesive layer ensures the continuity and synergistic effect of interfacial stress transmission. This composite system integrates the load-bearing function of magnesium alloy with the damping function of viscoelastic materials, overcoming the limitations of narrow temperature and frequency range and low efficiency of single-material damping. It achieves a unified approach of lightweight, broadband, high damping, and structural functionality. It has significant application value in the field of vibration reduction systems. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of a broadband damping composite system. Figure 2 A structural schematic diagram of the installation of a broadband damping composite system with a steel structure floor slab; Figure 3 A partial schematic diagram of the installation of the broadband damping composite system with the profiled steel sheet; Figure 4 A bottom view of the installation of the broadband damping composite system with the steel structure floor slab; Among them, 1-viscoelastic damping layer; 2-adhesive layer; 3-magnesium alloy constraint layer; 31-magnesium alloy body; 32-ceramic oxide layer; 4-steel structure floor slab; 41-cast-in-place concrete layer; 42-profiled steel sheet; 43-installation base surface; 44-column; 45-beam; 5-wideband damping composite system module. Detailed Implementation

[0049] The following description, with reference to preferred embodiments, illustrates the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are merely illustrative of the present invention and not intended to limit the scope of protection of the present invention.

[0050] The present invention aims to provide a broadband damping composite system to solve the problem that existing building damping systems cannot simultaneously achieve high energy efficiency, extreme lightweight, broadband adaptability and ease of implementation.

[0051] Among them, such as Figure 1 As shown, the broadband damping composite system consists of a viscoelastic damping layer 1, an adhesive layer 2, and a magnesium alloy constraint layer 3. The viscoelastic damping layer 1 is made of butyl rubber, acrylate polymer or polyurethane material.

[0052] In some embodiments, the magnesium alloy constraint layer 3 is composed of a magnesium alloy body 31 and a ceramic oxide layer 32 disposed on the surface of the magnesium alloy body 31. The magnesium alloy body 31 is made of AZ31B magnesium alloy sheet, AZ91D magnesium alloy sheet or ZK60 magnesium alloy sheet.

[0053] The AZ31B magnesium alloy sheet contains, by mass percentage: 2.5-3.5% aluminum (Al), 0.6-1.4% zinc (Zn), 0.2-1.0% manganese (Mn), with the balance being magnesium (Mg). The impurity elements in the AZ31B magnesium alloy sheet are: silicon (Si) ≤0.10%, iron (Fe) ≤0.005%, copper (Cu) ≤0.05%, nickel (Ni) ≤0.005%, and calcium (Ca) ≤0.04%.

[0054] The material composition of AZ91B magnesium alloy sheet, by mass percentage, includes: 8.5~9.5% aluminum (Al), 0.45~0.90% zinc (Zn), 0.17~0.40% manganese (Mn), with the balance being magnesium (Mg). The impurity elements in AZ91B magnesium alloy sheet are: silicon (Si) ≤0.05%, iron (Fe) ≤0.004%, copper (Cu) ≤0.025%, and nickel (Ni) ≤0.001%.

[0055] The material composition of ZK60 magnesium alloy sheet, by mass percentage, includes: 5.0~6.0% aluminum (Al), 0.45~0.8% zirconium (Zr), and the balance is magnesium (Mg).

[0056] For example, the magnesium alloy body 31 is made of 3mm thick AZ31B-H24 grade magnesium alloy rolled plate.

[0057] In some embodiments, the magnesium alloy body 31 undergoes micro-arc oxidation surface treatment to form a ceramic oxide layer 32 on the surface of the magnesium alloy body 31, thereby obtaining a magnesium alloy constraint layer 3.

[0058] In some embodiments, the yield strength of the magnesium alloy confinement layer 3 is not less than 160 MPa.

[0059] In some embodiments, the thickness of the magnesium alloy constraint layer 3 is 2~6 mm.

[0060] In some embodiments, the acrylate polymer is selected from pressure-sensitive adhesives or damping materials from 3M Company; the acrylate polymer composition, by weight, includes: 50-70 parts of monohydric alcohol acrylate soft monomer, 20-40 parts of nonpolar olefin unsaturated hard monomer and 3-8 parts of polar olefin unsaturated functional monomer, and the glass transition temperature Tg of the acrylate polymer is -40℃ to -20℃.

[0061] In some embodiments, the monohydric alcohol acrylate soft monomer is selected from isooctyl acrylate (2-EHA), and the glass transition temperature of the homopolymer of isooctyl acrylate (2-EHA) is approximately -70°C.

[0062] In some embodiments, the nonpolar olefin unsaturated hard monomer is selected from vinyl acetate (VAc), wherein the solubility parameter of the vinyl acetate (VAc) is ≤10.5 and the homopolymer Tg≈22℃.

[0063] In some embodiments, the polar olefin unsaturated functional monomer is selected from acrylic acid (AA) and / or hydroxyethyl acrylate (HEA).

[0064] In some embodiments, the polyurethane material is selected from high-damping TPU materials. Specifically, the polyurethane material is selected from Covestro's DP 2590A high-damping TPU material.

[0065] In some embodiments, the loss factor of the viscoelastic damping layer 1 is not less than 0.3, and the thickness of the viscoelastic damping layer is 1~3mm.

[0066] In some embodiments, the material of the adhesive layer 2 is selected from epoxy resin structural adhesive, high-performance high-toughness epoxy resin adhesive, or acrylate structural adhesive.

[0067] The epoxy structural adhesive used is a two-component epoxy resin adhesive, specifically Loctite EA 9492 or other similar products. The volume ratio of resin to curing agent in the two-component epoxy resin adhesive is 2:1. The initial curing time at room temperature is 75 minutes, and complete curing requires 3 days. The working temperature range is -40℃ to 180℃, and the tensile strength is ≥31 N / mm². 2 After curing, it has a Shore hardness of 80D, extremely low outgassing characteristics and excellent solvent resistance, and is suitable for bonding a variety of substrates such as metals, plastics and composites.

[0068] High-performance, high-toughness epoxy resin adhesives are selected from toughened two-component epoxy structural adhesives. The model of the toughened two-component epoxy structural adhesive is Loctite EA E-120HP or other similar products. The mass ratio of resin to curing agent in the toughened two-component epoxy structural adhesive is 2:1. It fully cures in 24 hours at room temperature and has a working temperature range of -40℃ to 150℃. It has excellent impact strength and peel resistance and is suitable for structural bonding of various substrates such as metals, plastics, and ceramics. It is especially suitable for applications requiring high impact toughness.

[0069] The acrylic structural adhesive uses a two-component acrylic structural adhesive. The model of the two-component acrylic structural adhesive can be Tianshan Kesaixin TS828 or other similar products. The volume ratio of resin to curing agent in the two-component acrylic structural adhesive is 10:1. It can initially cure in 4-6 minutes at room temperature, and can reach more than 80% of the final strength in 20 minutes. The working temperature range is -40℃ to 80℃. After curing, it has high strength, good toughness and peel resistance of the adhesive layer, and especially excellent thermal strength performance. It is suitable for bonding a variety of materials such as metal, plastic, leather, rubber, and wood.

[0070] In some embodiments, the thickness of the adhesive layer is 0.5~1mm.

[0071] In some embodiments, a method for constructing a broadband damping composite system is also provided, comprising the following steps: The viscoelastic damping layer 1 and the magnesium alloy constraint layer 3 are combined into one unit through the adhesive layer 2 to obtain a broadband damping composite system.

[0072] In some embodiments, before the viscoelastic damping layer 1 and the magnesium alloy restraint layer 3 are integrated, the method further includes: performing micro-arc oxidation surface treatment on the surface of the magnesium alloy body 31 to form a dense ceramic oxide layer 32 on the surface of the magnesium alloy body 31, thereby obtaining a magnesium alloy restraint layer 3 with improved corrosion resistance and adhesion. The specific steps of the micro-arc oxidation surface treatment include: placing the magnesium alloy body 31 in a silicate electrolyte or aluminate electrolyte and treating it using a pulse power mode to form a ceramic oxide layer 32 on the surface of the magnesium alloy body 31.

[0073] In some embodiments, the silicate electrolyte comprises sodium silicate (Na2SiO3·9H2O), potassium hydroxide (KOH), potassium fluoride (KF), and water, wherein the concentration of sodium silicate in the silicate electrolyte is 10 g / L, the concentration of potassium hydroxide is 2 g / L, and the concentration of potassium fluoride is 2 g / L.

[0074] In some embodiments, the aluminate electrolyte comprises sodium aluminate (NaAlO2), potassium hydroxide (KOH), sodium tungstate (Na2WO4·2H2O) and water, wherein the concentration of sodium aluminate in the aluminate electrolyte is 8 g / L, the concentration of potassium hydroxide is 1.5 g / L, and the concentration of sodium tungstate is 3 g / L.

[0075] In some embodiments, the operating parameters for pulse power supply mode processing are: constant current mode with a current density of 12A / dm². 2 The electrolyte was processed at 200 Hz for 15 minutes, then switched to 800 Hz for 10 minutes, with a duty cycle of 30%, for a total processing time of 25 minutes. The electrolyte temperature was maintained at 25±5℃. The electrolyte temperature was kept between 25±5℃ by water bath cooling.

[0076] In some embodiments, the ceramic oxide layer 32 comprises MgO and Mg2SiO4, or MgO and MgAl2O4.

[0077] After micro-arc oxidation surface treatment, the corrosion resistance of the magnesium alloy confinement layer 3 can be determined by a typical neutral salt spray test (according to GB / T 10125 or ASTM B117 standards), and the bonding performance of the ceramic oxide layer 32 can be tested by cross-cut test (refer to GB / T 9286 or ASTM D3359) or tensile test.

[0078] In some embodiments, the specific operation method for bonding the viscoelastic damping layer 1 and the magnesium alloy constraint layer 3 together through the adhesive layer 2 includes the following steps: grinding and cleaning the side of the magnesium alloy constraint layer 3 used for bonding, then uniformly applying the adhesive layer 2 to one side of the magnesium alloy constraint layer 3, and controlling the thickness of the adhesive layer 2 to be about 0.5~1.0 mm, then aligning the viscoelastic damping layer 1 with one side of the magnesium alloy constraint layer 3 and bonding them together, applying a uniform pressure of 0.2~0.5 MPa to ensure that the adhesive layer 2 is dense and free of air bubbles, thus obtaining the bonded broadband damping composite system; subsequently, the bonded broadband damping composite system is cured at a temperature of 21~25℃ under pressure of 0.2~0.5 MPa for at least 24 hours or by using stepped temperature increase curing to improve curing efficiency, and after complete curing, it is cured at room temperature for more than 24 hours to obtain the successfully constructed broadband damping composite system.

[0079] In some embodiments, the application of the broadband damping composite system obtained by the construction method in steel structure floor slabs is also provided.

[0080] like Figure 2 and Figure 3 As shown, in some embodiments, the installation method of the broadband damping composite system includes the following steps: The steel structure floor slab 4 includes a cast-in-place concrete layer 41 and a profiled steel sheet 42 set below the cast-in-place concrete layer 41. The installation area of ​​the broadband damping composite system is on the installation base surface 43 formed by the lower flange of the profiled steel sheet 42. An adhesive layer 2 is applied to the mounting base 43 formed by the lower flange of the profiled steel sheet 42 of the steel structure floor slab 4 and the viscoelastic damping layer 1 of the broadband damping composite system. Then, the viscoelastic damping layer 1 of the broadband damping composite system is bonded to the mounting base 43 formed by the lower flange of the profiled steel sheet 42 and then cured under pressure to realize the installation of the broadband damping composite system.

[0081] In some embodiments, the curing pressure is 18~28°C, the temperature is 18~28°C, and the time is 48~72h.

[0082] To make the technical problems, solutions, and beneficial effects of this application clearer, the broadband damping composite system, its construction method, and its application will be further described in detail below with reference to specific embodiments and accompanying drawings. Obviously, the specific embodiments described are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its applications. Based on the specific embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Example 1

[0083] like Figure 1 As shown, a method for constructing a broadband damping composite system includes the following steps: S1. Determine the thickness, laying size, and edge shape of each functional layer. Specifically, the thickness of magnesium alloy restraint layer 3 is 4mm; the thickness of viscoelastic damping layer 1 is 2mm; and the thickness of adhesive layer 2 is 0.8mm. The size of a single damping plate is 500mm×500mm, and the edges are cut according to the shape of the floor slab.

[0084] S2. Using a 3mm thick AZ31B-H24 grade magnesium alloy rolled plate as the magnesium alloy body 31, the magnesium alloy body 1 is subjected to micro-arc oxidation surface treatment to form a dense ceramic oxide layer 32 on the surface of the magnesium alloy rolled plate, thereby improving the corrosion resistance and adhesion of the magnesium alloy, and obtaining a 4mm thick magnesium alloy constraint layer 3. Among them, in the AZ31B-H24 grade magnesium alloy rolled plates, AZ31B is the alloy grade, indicating a Mg-Al-Zn system, containing 3% Al, 1% Zn and 0.2% Mn in wrought magnesium alloy. H24 is the processing condition code, indicating partial annealing after cold rolling (strain hardening + stress relief annealing), which maintains the high strength of work hardening while improving plasticity and stability.

[0085] The specific steps of micro-arc oxidation surface treatment include: placing the AZ31B-H24 grade magnesium alloy rolled plate in a silicate electrolyte. The silicate electrolyte consists of sodium silicate (Na2SiO3·9H2O), potassium hydroxide (KOH), potassium fluoride (KF), and water. The concentration of sodium silicate (Na2SiO3·9H2O) in the silicate electrolyte is 10 g / L, the concentration of potassium hydroxide (KOH) is 2 g / L, and the concentration of potassium fluoride (KF) is 2 g / L. Micro-arc oxidation surface treatment was performed using a pulsed power supply mode. The operating parameters for the pulsed power supply mode were: constant current mode with a current density of 12 A / dm³. 2 The frequency was initially 200 Hz for 15 minutes, then switched to 800 Hz for 10 minutes, with a duty cycle of 30%, for a total processing time of 25 minutes. The electrolyte temperature was maintained at 25±5℃ using a water bath. A ceramic oxide layer 32 was formed on the surface of the AZ31B-H24 grade magnesium alloy rolled plate, resulting in a magnesium alloy constraint layer 3 with a thickness of 4 mm.

[0086] S3. A 2mm thick high-damping butyl rubber sheet is selected as the viscoelastic damping layer 1. In this embodiment, commercially available Snugdamp 201A butyl damping sheet (Hangzhou Zhijiang Organosilicon Chemical Co., Ltd.) is selected. This product uses butyl rubber as the main material, has a loss factor of not less than 0.3, and has good vibration reduction performance and construction adaptability.

[0087] Epoxy resin structural adhesive is selected as the bonding layer 2. In this example, EA9492 two-component epoxy structural adhesive produced by Loctite is used. This product is a two-component epoxy resin formulation, and the volume ratio of resin to curing agent in the two-component epoxy resin adhesive is 2:1.

[0088] Grind, clean and dry the side of the magnesium alloy constraint layer 3 obtained in S2 that is used for bonding. Mix the two-component epoxy resin structural adhesive according to the specified ratio and apply it evenly to one side of the magnesium alloy constraint layer 3. Control the thickness of the bonding layer 2 to be about 0.8 mm. Then align the viscoelastic damping layer 1 with one side of the magnesium alloy constraint layer 3 and attach it. Apply a pressure of 0.3 MPa evenly to ensure that the bonding layer 2 is dense and free of air bubbles. Cure for at least 3 days to obtain the bonded broadband damping composite system. S4. The bonded broadband damping composite system obtained in S3 is cured at 23°C under pressure of 0.3 MPa for 24 hours. After complete curing, it is cured at room temperature for more than 24 hours to obtain the successfully constructed broadband damping composite system.

[0089] The corrosion resistance of the ceramic oxide layer of the magnesium alloy confinement layer of the successfully constructed broadband damping composite system was tested using a typical neutral salt spray test (according to GB / T 10125 standard). The results showed that the ceramic layer after micro-arc oxidation surface treatment can provide hundreds to thousands of hours of protection, and the time to pitting corrosion is significantly longer than that of the surface without micro-arc oxidation treatment.

[0090] The adhesion of the ceramic oxide layer to the magnesium alloy confinement layer of the successfully constructed broadband damping composite system was tested using the cross-cut adhesion test (referring to GB / T 9286), revealing that the adhesion of the ceramic oxide layer reached the highest level (Level 0). The bond strength between the ceramic oxide layer and the magnesium alloy body of the successfully constructed broadband damping composite system was tested using the tensile test, showing that the bond strength between the ceramic oxide layer and the magnesium alloy body is greater than 50 MPa. These properties ensure the long-term durability of the magnesium alloy confinement layer in building environments and its reliable composite with the viscoelastic damping layer. Example 2

[0091] like Figures 1 to 3 As shown, the installation method of the broadband damping composite system constructed in Example 1 includes the following steps: S1. The steel structure floor slab 4 includes a cast-in-place concrete layer 41 and a profiled steel sheet 42 set below the cast-in-place concrete layer 41. The installation area of ​​the broadband damping composite system is on the installation base surface 43 formed by the lower flange of the profiled steel sheet 42. The installation base surface 43 is thoroughly ground and cleaned to remove all dust, oil stains and loose old coatings, ensuring that the base surface is solid, clean and dry, and the pre-treated profiled steel sheet 42 is obtained. S2. Use a cutting machine to process the broadband damping composite system constructed in Example 1 into 500mm×500mm modules, and cut the edges according to the shape of the floor slab. S3. Epoxy resin structural adhesive is uniformly applied to the mounting base 43 of the pretreated profiled steel sheet 42 obtained in S1 and one side of the viscoelastic damping layer 1 of the broadband damping composite system module. Then, the broadband damping composite system module is precisely pasted onto the mounting base 43 on the bottom surface of the profiled steel sheet 42. It is then cured for 60 hours under a pressure of 0.3 MPa and a temperature of about 23°C. After curing, the hollow areas are checked. The hollow area of ​​a single broadband damping composite system module shall not exceed 5%, and there shall be no hollow areas in the main stress areas. S4. After confirming the hollow areas are within acceptable limits, Henkel TEROSON PU 8690 HM single-component flexible polyurethane sealant is used to fill and seal the joints between adjacent broadband damping composite system modules. This sealant possesses high shear strength and good elasticity to allow for temperature stress release and ensure the overall integrity of the system's appearance, thus completing the installation of the broadband damping composite system. The bottom view of the installed steel structure floor slab 4 is shown below. Figure 4 As shown, the broadband damping composite system module 5 is installed between the column 44 and beam 45 of the steel structure floor slab 4.

[0092] In summary, the broadband damping composite system of this invention has the following advantages: 1) Significantly superior vibration reduction performance: By employing a magnesium alloy constraint layer with high constraint stiffness and additional material damping, working in synergy with a viscoelastic damping layer, the composite system achieves a higher composite loss factor in the low-frequency range (2~8Hz) of concern to building floor slabs. 2) Lightweight integration: The additional load is small, solving the compatibility problem between the high-efficiency damping system and the lightweight main structure, providing a practical technical solution for the vibration comfort upgrade of a large number of existing lightweight steel structure buildings (especially mezzanine). 3) Excellent broadband adaptability: The inherent damping characteristics of magnesium alloy make its sensitivity to frequency changes much lower than that of a pure viscoelastic system. Combined with the broadband energy dissipation characteristics of the damping layer, this system can maintain stable vibration reduction performance over a wide frequency range, overcoming the inherent shortcomings of narrow bandwidth and poor adaptability of devices such as TMD. 4) High engineering feasibility and reliability: The system has a clear structure, and reliable composite can be achieved using only mature bonding technology, avoiding complex mechanical connection procedures, making construction convenient and easy to coordinate with building decoration procedures. It has application value in the field of vibration reduction system technology.

[0093] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A broadband damping composite system, characterized in that, It consists of a viscoelastic damping layer, an adhesive layer, and a magnesium alloy restraint layer; The viscoelastic damping layer is made of butyl rubber, acrylate polymer or polyurethane material.

2. The broadband damping composite system according to claim 1, characterized in that, The magnesium alloy confinement layer consists of a magnesium alloy body and a ceramic oxide layer disposed on the surface of the magnesium alloy body. The magnesium alloy body is made of AZ31B magnesium alloy sheet, AZ91D magnesium alloy sheet or ZK60 magnesium alloy sheet.

3. The broadband damping composite system according to claim 2, characterized in that, The magnesium alloy body undergoes micro-arc oxidation surface treatment to form a ceramic oxide layer on the surface of the magnesium alloy body, thereby obtaining the magnesium alloy constraint layer. The yield strength of the magnesium alloy confinement layer is not less than 160 MPa; The thickness of the magnesium alloy constraint layer is 2~6mm.

4. The broadband damping composite system according to claim 1, characterized in that, The acrylate polymer is selected from pressure-sensitive adhesives or damping materials. The components of the acrylate polymer, by weight, include: 50-70 parts of monohydric alcohol acrylate soft monomer, 20-40 parts of nonpolar olefin unsaturated hard monomer and 3-8 parts of polar olefin unsaturated functional monomer. The glass transition temperature Tg of the acrylate polymer is -40℃ to -20℃. The polyurethane material is selected from high-damping vibration-damping TPU material; The loss factor of the viscoelastic damping layer is not less than 0.3, and the thickness of the viscoelastic damping layer is 1~3mm.

5. The broadband damping composite system according to claim 1, characterized in that, The adhesive layer is made of epoxy resin structural adhesive, high-performance high-toughness epoxy resin adhesive, or acrylate structural adhesive. The thickness of the adhesive layer is 0.5~1mm.

6. A method for constructing a broadband damping composite system as described in any one of claims 1 to 5, characterized in that, Includes the following steps: By bonding the viscoelastic damping layer and the magnesium alloy constraint layer together, a broadband damping composite system is obtained.

7. The construction method according to claim 6, characterized in that, Prior to the composite process, the method further includes: performing micro-arc oxidation surface treatment on the surface of the magnesium alloy body to obtain the magnesium alloy constraint layer; The specific steps of the micro-arc oxidation surface treatment include: placing the magnesium alloy body in a silicate electrolyte or aluminate electrolyte and treating it using a pulse power mode to form a ceramic oxide layer on the surface of the magnesium alloy body.

8. The construction method according to claim 7, characterized in that, The silicate electrolyte comprises sodium silicate (Na2SiO3·9H2O), potassium hydroxide (KOH), potassium fluoride (KF), and water, wherein the concentration of sodium silicate in the silicate electrolyte is 10 g / L, the concentration of potassium hydroxide is 2 g / L, and the concentration of potassium fluoride is 2 g / L. The aluminate electrolyte comprises sodium aluminate (NaAlO2), potassium hydroxide (KOH), sodium tungstate (Na2WO4·2H2O) and water, wherein the concentration of sodium aluminate in the aluminate electrolyte is 8 g / L, the concentration of potassium hydroxide is 1.5 g / L, and the concentration of sodium tungstate is 3 g / L. The operating parameters for the pulse power supply mode processing are: constant current mode, current density of 12 A / dm². 2 The frequency was 200 Hz for 15 minutes, then switched to 800 Hz for 10 minutes, with a duty cycle of 30%, for a total processing time of 25 minutes and an electrolyte temperature of 25 ± 5℃. The ceramic oxide layer comprises MgO and Mg2SiO4, or MgO and MgAl2O4.

9. The application of the broadband damping composite system obtained by the construction method according to any one of claims 6 to 8 in steel structure floor slabs.

10. The application according to claim 9, characterized in that, The installation method of the broadband damping composite system includes the following steps: An adhesive layer is applied to the mounting base surface formed by the lower flange of the profiled steel sheet of the steel structure floor slab and the viscoelastic damping layer of the broadband damping composite system. Then, the viscoelastic damping layer of the broadband damping composite system is bonded to the mounting base surface formed by the lower flange of the profiled steel sheet, and then cured under pressure to realize the installation of the broadband damping composite system.

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