Metal / viscoelastic polyamideimide periodic composite high-temperature damping coating material as well as preparation method and application of metal / viscoelastic polyamideimide periodic composite high-temperature damping coating material

Abstract

The invention discloses a metal / viscoelastic polyamide-imide periodic composite high-temperature damping coating material and a preparation method and application thereof, and relates to the technical field of functional materials, the preparation method comprises the following steps: preparing a 0.1 mm-2mm alloy sheet; periodically laminating the prepared alloy sheets and viscoelastic polyamidoimine in an alternate laminating manner to prepare the composite vibration and noise reduction material; a thin plate and viscoelastic polyamidoimine are integrally formed into a whole by adopting a mold preparation and integrated compression molding method for the periodically stacked composite vibration and noise reduction material. After the layered composite acoustic metamaterial prepared by the preparation method is applied to air pipes and other medium pipelines of nuclear facilities, surfaces of other vibration devices and supporting parts and other devices needing noise shielding, the vibration reduction effect is greatly improved, the vibration is reduced by not less than 4dB relative to a polished rod under the condition of white noise excitation, and the performance of the metamaterial is improved. The vibration is excited by adopting a specific line spectrum, and the maximum reduction can reach 14dB.

Description

Technical Field

[0001] The invention relates to the technical field of functional materials, and in particular to a metal / viscoelastic polyamideimide periodically composite high-temperature damping coating material and a preparation method and application thereof. Background Art

[0002] The surface temperature of high-energy pipelines and equipment in nuclear facilities, power stations, etc. is relatively high, up to 300°C. The existing materials on the surface of high-energy pipelines and equipment only have the function of heat preservation and cannot play a vibration reduction role under high temperature conditions. Vibration noise control of high-energy pipelines, air ducts and vibrating equipment is one of the key points of vibration noise control in nuclear facilities. The vibration noise of some high-energy pipelines obviously causes vibration and noise to exceed the standard, which has seriously threatened the physical and mental health of the staff. Considering that vibration noise control is a systematic project, only by starting from structural vibration reduction design, application of vibration reduction and noise reduction materials, and application of vibration reduction technology, can the noise be effectively controlled, that is, a comprehensive control method is adopted. In order to reduce the vibration noise level of high-energy pipelines and air ducts, other vibrating equipment and supporting components, and other surfaces that require noise shielding, it is necessary to install vibration reduction and noise reduction materials on the surface of related equipment.

[0003] Patent CN106003920B discloses a sandwich composite material for high-speed train floors. The upper and lower panels of the sandwich composite material are Glare laminates, which are composed of ultra-fine glass fiber reinforced composite materials and high-strength aluminum alloy sheets alternately laminated; the interlayer is glass fiber reinforced melamine foam, and the glass fiber is evenly distributed in the foam matrix, which plays a role in enhancing the mechanical properties of the melamine foam, so that it can withstand a large mechanical load while having excellent noise reduction effects. The plywood on both sides of the sandwich composite material is made of aluminum alloy sheets and ultra-fine glass fibers alternately laminated, and melamine foam is used between the two plywoods. The melamine foam plays a role in sound insulation, and the plywood formed by the alternating lamination of aluminum alloy sheets and ultra-fine glass fibers plays a reinforcing role. Although the sandwich composite material can achieve the effect of sound insulation, its vibration reduction effect is low, so its application in nuclear facilities has certain defects.

[0004] Most of the currently disclosed sound insulation composite materials, like the above-mentioned patent, usually can only play a sound insulation effect, but the materials used in the air ducts and other medium pipelines of nuclear facilities, other vibrating equipment and the surface of supporting components need to have a certain vibration reduction function. Summary of the invention

[0005] Based on the problem that current composite materials lack vibration reduction effect, which leads to certain defects in their application in nuclear facility-related equipment, the purpose of the present invention is to provide a layered composite acoustic metamaterial and a preparation method and application thereof. The layered composite acoustic metamaterial prepared by the preparation method can achieve a good vibration reduction effect.

[0006] The present invention is achieved through the following technical solutions:

[0007] In a first aspect, the present application provides a method for preparing a metal / viscoelastic polyamideimide periodically composite high-temperature damping coating material, comprising the following steps:

[0008] Preparation of 0.1mm to 2mm metal sheets;

[0009] The prepared metal sheet and viscoelastic polyamide-imide are alternately stacked to periodically prepare a composite vibration-damping and noise-reducing material;

[0010] The periodically stacked composite vibration-damping and noise-reducing material is prepared by a mold and integrated pressing method, and the thin plate and the viscoelastic polyamide-imide are integrated to form a whole.

[0011] Among them, the thickness of the prepared alloy thin plate can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, or any other value in the range of 0.1mm to 2mm, which can be determined according to actual needs.

[0012] In a specific embodiment, the material used to prepare the metal sheet includes an alloy sheet.

[0013] In a specific embodiment, the alloy thin plate includes a damping alloy thin plate, and the damping alloy thin plate includes any one of Mn-Cu series, Fe-Cr series, Fe-Mn series, and Ti-Nb series. In addition, it can also be an aluminum alloy thin plate, or other thin plates made of metal materials.

[0014] In a specific embodiment, the alloy sheet can be prepared into a corrugated shape, and the specific corrugated shape can be an arc, a sine wave, etc.

[0015] In a specific embodiment, the viscoelastic polyamideimide includes viscoelastic polyamideimide or bulk material. The polyimide is resistant to high temperatures, and has a loss factor of 0.2 to 0.8 at 260° C., and can reach up to 0.75.

[0016] In a specific embodiment, the viscoelastic polyamideimide can be any one of rubber, viscoelastic polyimide and polyurethane under normal temperature conditions.

[0017] In a specific embodiment, the rubber includes NBR, EPDM rubber, chloroprene rubber and the like.

[0018] In a specific embodiment, the alloy sheet is prepared by hot rolling or cold rolling.

[0019] In a specific embodiment, the alternating periodic layers of the thin plate and the viscoelastic polyamideimide are 3 to 10 layers.

[0020] Among them, the alternating periodic layers of the alloy sheet and the viscoelastic polyamideimide can be 1 layer, 2 layers, 3 layers, 4 layers, 5 layers, 6 layers, 7 layers, 8 layers, 9 layers, 10 layers, and according to actual needs, it can also be a structure with more than 10 layers.

[0021] In a specific embodiment, the prepared composite vibration-damping and noise-reducing material has a shape including a plate shape and a curved tile shape.

[0022] The shape of the prepared composite vibration-damping and noise-reducing material may be other shapes besides the shapes listed above, and the specific shape may be set according to its application object.

[0023] In a specific embodiment, the mold used for molding the composite vibration-damping and noise-reducing material contains a cavity that can accommodate the periodic layered composite structure, and the cavity is expanded by 5 mm to 100 mm relative to the overall dimensions of the application object.

[0024] Among them, the distance of the overall outward expansion of the cavity relative to the external dimensions of the application object can be 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 75mm, 80mm, 95mm, 100mm, or any other distance value between 5mm and 100mm, which can be determined according to actual needs.

[0025] In a specific embodiment, the composite vibration and noise reduction material is formed by spraying or vulcanization process, and is alternately pressed layer by layer, and the thickness of each layer is 1 mm to 10 mm.

[0026] The thickness of each layer of the composite vibration reduction and noise reduction material can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm. It can be any other distance value between 1mm and 10mm, which can be determined according to actual needs.

[0027] In a specific embodiment, the prepared high-temperature damping coating material is resistant to extreme environments such as high temperature of not less than 260° C., radiation, and salt spray.

[0028] In a second aspect, the present application provides a method for preparing a metal / viscoelastic polyamideimide periodic composite high-temperature damping coating material, which is prepared using the above-mentioned preparation method.

[0029] In a third aspect, the present application provides an application of a method for preparing a metal / viscoelastic polyamideimide periodic composite high-temperature damping coating material, and an adhesive application method is used to fix the above-formed layered composite acoustic metamaterial to the surface of an application object.

[0030] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0031] (1) After the layered composite acoustic metamaterial prepared by the preparation method in the embodiment of the present invention is applied to the air ducts and other medium high-temperature pipelines of nuclear facilities (the maximum surface temperature can reach 260°C), other vibrating equipment and support component surfaces, and other equipment that requires vibration suppression, the vibration reduction effect of the relevant facilities has been greatly improved.

[0032] (2) The layered composite acoustic metamaterial prepared by the preparation method in the embodiment of the present invention was subjected to an insertion loss test on a high-energy pipeline (maximum surface temperature can reach 260°C) bench, which confirmed that the relative light rod vibration reduction under white noise excitation is not less than 4dB (10Hz~5KHz), and the vibration reduction using specific line spectrum excitation can reach up to 14dB (10Hz~5KHz). BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0034] Figure 1 This is a vibration reduction effect detection diagram before and after the application of the preparation method of the metal / viscoelastic polyamideimide periodic composite high-temperature damping coating material prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0035] 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 in conjunction with embodiments. The illustrative embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0036] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is apparent to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other embodiments, in order to avoid confusing the present invention, well-known materials or methods are not specifically described.

[0037] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or subcombination. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] The "range" disclosed in the present application is defined in the form of a lower limit and an upper limit, and a given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundaries of the particular range. The range defined in this way can be inclusive or exclusive of the end values, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a range. For example, if a range of 60 to 120 and 80 to 110 is listed for a particular parameter, it is understood that a range of 60 to 110 and 80 to 120 is also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4 and 5 are listed, the following ranges can all be expected: 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4 and 2 to 5. In the present application, unless otherwise specified, the numerical range "a to b" represents an abbreviation of any real number combination between a and b, where a and b are both real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this document, and "0-5" is just an abbreviation of these numerical combinations. In addition, when a parameter is expressed as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0039] If there is no special explanation, all steps of the present application can be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, the method may further include step (c), which means that step (c) may be added to the method in any order. For example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0040] In a first aspect, the present application provides a method for preparing a metal / viscoelastic polyamideimide periodically composite high-temperature damping coating material, comprising the following steps:

[0041] S1. A metal sheet with a thickness of 0.1 mm to 2 mm is prepared by hot rolling or cold rolling. The material for preparing the alloy sheet includes any one of the Mn-Cu series, Fe-Cr series, Fe-Mn series, and Ti-Nb series.

[0042] S2. The prepared metal sheet and viscoelastic polyamideimide are used to periodically stack a composite vibration-damping and noise-reducing material in an alternating manner; wherein the stacked periodic layers are 3 to 10 layers, and the viscoelastic polyamideimide used includes viscoelastic polyamideimide or bulk material.

[0043] S3, using a mold preparation and integrated pressing method to integrate the alloy sheet and the viscoelastic polyamide imide into a whole;

[0044] S3-1. According to the application object, a special mold is designed to prepare layered composite materials. The principle of mold design is to form a cavity that accommodates the periodic layered composite structure. The cavity is 5mm to 100mm larger than the overall size of the application object. The specific size is determined according to the actual needs of the application object. The upper and lower surfaces of the mold should be supportive planes to achieve press molding;

[0045] S3-2, adopt the spraying process, press and form alternately layer by layer, the thickness of each layer is 1mm to 10mm, and form a layered composite acoustic metamaterial.

[0046] Among them, after the overall preparation is completed, the upper cover plate is fastened with screws, and external pressure is applied when necessary to reduce the cavities or pores formed during the layered composite curing process;

[0047] In a second aspect, the present application provides a layered composite acoustic metamaterial, which is prepared using the above-mentioned preparation method. The prepared layered composite acoustic metamaterial can be in the shape of a plate, a curved tile, etc., and matches the external dimensions of application objects such as pipes, pumps, and motors.

[0048] In the third aspect, the present application provides an application of a layered composite acoustic metamaterial, and the above-formed layered composite acoustic metamaterial is fixed to the surface of the application object by an adhesive application method. The specific method is: coating the prepared layered composite acoustic metamaterial on the surface of the application object, uniformly coating a damping material with a thickness of 0.1mm to 5mm between the application object and the layered composite acoustic metamaterial; coating an adhesive on the inner layer of the layered structure, and by using an adhesive, the layered composite acoustic metamaterial can be used for a long time without falling off.

[0049] Example 1

[0050] This embodiment provides a method for preparing a metal / viscoelastic polyamide-imide periodically composite high-temperature damping coating material, which is prepared by the following steps:

[0051] S1. Using Mn-Cu system as the material of alloy thin plate, a 0.1 mm alloy thin plate is prepared by hot rolling process;

[0052] S2. The prepared alloy sheet and polyimide are alternately stacked to periodically stack a composite vibration reduction and noise reduction material; wherein the stacked periodic layers are 5 layers;

[0053] S3, using a mold preparation and integrated pressing method to integrate the alloy sheet and the viscoelastic polyamide imide into a whole;

[0054] S3-1. Design a special mold to prepare layered composite materials according to the application object. The principle of mold design is to form a cavity to accommodate the periodic layered composite structure. The cavity is 20mm larger than the overall size of the application object. The upper and lower surfaces of the mold should be supportive planes to achieve compression molding.

[0055] S3-2, using the spraying process, alternately pressing and forming layer by layer, the thickness of each layer is 4mm, forming a layered composite acoustic metamaterial.

[0056] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 108 mm by an adhesive application method, and an insertion loss test was performed at 260° C. on a pipeline vibration test bench. Figure 1 The figure shows the test results before and after coating. The excitation spectrum uses white noise and the final insertion loss is 8.7dB.

[0057] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm by an adhesive application method. An insertion loss test was carried out at 260°C on a pipeline vibration test bench. The excitation spectrum adopted a specific spectrum. The insertion loss of a 20 mm thick pipeline covering was 11.4 dB. The insertion loss of a 20 mm thick layered composite covering structure covering could reach up to 21 dB after integration with other vibration reduction components.

[0058] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm using an adhesive application method. An insertion loss test was performed at full power operation. After the 20 mm thick pipeline covering was applied, the insertion loss was up to 3 dB.

[0059] Example 2

[0060] This embodiment provides a method for preparing a metal / viscoelastic polyamide-imide periodically composite high-temperature damping coating material. The difference from Embodiment 1 is that Fe-Cr is used as the preparation material of the alloy sheet in this embodiment. The other technical features are the same as those in Embodiment 1. The preparation is performed by the following steps:

[0061] S1. Using Fe-Cr system as the material of alloy thin plate, a 0.1 mm alloy thin plate is prepared by hot rolling process;

[0062] S2. The prepared alloy sheet and polyimide are alternately stacked to periodically stack a composite vibration reduction and noise reduction material; wherein the stacked periodic layers are 5 layers;

[0063] S3, using a mold preparation and integrated pressing method to integrate the alloy sheet and the viscoelastic polyamide imide into a whole;

[0064] S3-1. Design a special mold to prepare layered composite materials according to the application object. The principle of mold design is to form a cavity to accommodate the periodic layered composite structure. The cavity is 20mm larger than the overall size of the application object. The upper and lower surfaces of the mold should be supportive planes to achieve compression molding.

[0065] S3-2, using the spraying process, alternately pressing and forming layer by layer, the thickness of each layer is 4mm, forming a layered composite acoustic metamaterial.

[0066] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm by an adhesive application method. An insertion loss test was carried out at 260°C on a pipeline vibration test bench. The excitation spectrum adopted a specific spectrum. The insertion loss of a 20 mm thick pipeline covering was 12 dB. The insertion loss of a 20 mm thick layered composite covering structure covering could reach up to 23 dB after integration with other vibration reduction components.

[0067] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 108 mm by an adhesive application method. An insertion loss test was performed at 260° C. on a pipeline vibration test bench. White noise was used as the excitation spectrum, and the final insertion loss was 12.5 dB.

[0068] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm using an adhesive application method. An insertion loss test was performed at 200°C under full power operation. After the 20 mm thick pipeline covering was applied, the insertion loss was up to 8 dB.

[0069] Example 3

[0070] This embodiment provides a method for preparing a metal / viscoelastic polyamide-imide periodically composite high-temperature damping coating material. The difference from Embodiment 1 is that Fe-Mn system is used as the preparation material of the alloy sheet in this embodiment. The other technical features are the same as those in Embodiment 1. The preparation is performed by the following steps:

[0071] S1. Using Fe-Mn system as the material of alloy thin plate, a 0.1 mm alloy thin plate is prepared by hot rolling process;

[0072] S2. Using the prepared alloy sheet and viscoelastic polyimide in an alternating stacking manner to periodically stack a composite vibration reduction and noise reduction material; wherein the stacking periodic layers are 5 layers;

[0073] S3, using a mold preparation and integrated pressing method to integrate the alloy sheet and the viscoelastic polyamide imide into a whole;

[0074] S3-1. Design a special mold to prepare layered composite materials according to the application object. The principle of mold design is to form a cavity to accommodate the periodic layered composite structure. The cavity is 20mm larger than the overall size of the application object. The upper and lower surfaces of the mold should be supportive planes to achieve compression molding.

[0075] S3-2, using the spraying process, alternately pressing and forming layer by layer, the thickness of each layer is 4mm, forming a layered composite acoustic metamaterial.

[0076] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm by an adhesive application method. An insertion loss test was carried out at 260°C on a pipeline vibration test bench. The excitation spectrum adopted a specific spectrum. The insertion loss of a 20 mm thick pipeline covering was 13 dB. The insertion loss of a 20 mm thick layered composite covering structure covering could reach up to 20 dB after integration with other vibration reduction components.

[0077] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 108 mm by an adhesive application method. An insertion loss test was performed at 260° C. on a pipeline vibration test bench. White noise was used as the excitation spectrum, and the final insertion loss was 13 dB.

[0078] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm using an adhesive application method. An insertion loss test was performed at 200°C under full power operation. After the 20 mm thick pipeline covering was applied, the insertion loss was up to 8 dB.

[0079] Example 4

[0080] This embodiment provides a method for preparing a metal / viscoelastic polyamide-imide periodically composite high-temperature damping coating material. The difference from Embodiment 1 is that the Ti-Nb system is used as the preparation material of the alloy sheet in this embodiment. The other technical features are the same as those in Embodiment 1. The preparation is performed by the following steps:

[0081] S1. Using Ti-Nb system as the material of alloy thin plate, a 0.1 mm alloy thin plate is prepared by hot rolling process;

[0082] S2. Using the prepared alloy sheet and viscoelastic polyimide in an alternating stacking manner to periodically stack a composite vibration reduction and noise reduction material; wherein the stacking periodic layers are 5 layers;

[0083] S3, using a mold preparation and integrated pressing method to integrate the alloy sheet and the viscoelastic polyamide imide into a whole;

[0084] S3-1. According to the application object, a special mold is designed to prepare layered composite materials. The principle of mold design is to form a cavity that accommodates the periodic layered composite structure. The cavity is 5mm larger than the overall size of the application object. The upper and lower surfaces of the mold should be supportive planes to achieve compression molding;

[0085] S3-2, using the spraying process, alternately pressing and forming layer by layer, the thickness of each layer is 4mm, forming a layered composite acoustic metamaterial.

[0086] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm using an adhesive application method. An insertion loss test was carried out at 260°C on a pipeline vibration test bench. The excitation spectrum used a specific spectrum. The insertion loss of a 20 mm thick pipeline covering was 13 dB. The insertion loss of a 20 mm thick layered composite covering structure covering could reach up to 24 dB after integration with other vibration reduction components.

[0087] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 108 mm by an adhesive application method. An insertion loss test was performed at 260° C. on a pipeline vibration test bench. White noise was used as the excitation spectrum, and the final insertion loss was 13 dB.

[0088] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm using an adhesive application method. An insertion loss test was performed at 200°C under full power operation. After the 20 mm thick pipeline covering was applied, the insertion loss was up to 8 dB.

[0089] Example 5

[0090] This embodiment provides a method for preparing a metal / viscoelastic polyamide-imide periodically composite high-temperature damping coating material. The difference from Example 1 is that the thickness of the alloy sheet prepared in this embodiment is 0.5 mm. The other technical features are the same as those in Example 1. The preparation is carried out by the following steps:

[0091] S1. Using Mn-Cu system as the material of the alloy sheet, a 0.5 mm alloy sheet is prepared by hot rolling process;

[0092] S2. Using the prepared alloy sheet and viscoelastic polyimide in an alternating stacking manner to periodically stack a composite vibration reduction and noise reduction material; wherein the stacking periodic layers are 5 layers;

[0093] S3, using a mold preparation and integrated pressing method to integrate the alloy sheet and the viscoelastic polyamide imide into a whole;

[0094] S3-1. Design a special mold to prepare layered composite materials according to the application object. The principle of mold design is to form a cavity to accommodate the periodic layered composite structure. The cavity is 20mm larger than the overall size of the application object. The upper and lower surfaces of the mold should be supportive planes to achieve compression molding.

[0095] S3-2, using the spraying process, alternately pressing and forming layer by layer, the thickness of each layer is 4mm, forming a layered composite acoustic metamaterial.

[0096] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm using an adhesive application method. An insertion loss test was carried out at 260°C on a pipeline vibration test bench. The excitation spectrum used a specific spectrum. The insertion loss of a 20 mm thick pipeline covering was 9 dB. The insertion loss of a 20 mm thick layered composite covering structure covering could reach up to 19 dB after integration with other vibration reduction components.

[0097] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 108 mm by an adhesive application method. An insertion loss test was performed at 260° C. on a pipeline vibration test bench. White noise was used as the excitation spectrum, and the final insertion loss was 9 dB.

[0098] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm using an adhesive application method. An insertion loss test was performed at 200°C under full power operation. After the application of the 20 mm thick pipeline covering, the insertion loss was up to 7 dB.

[0099] Example 6

[0100] This embodiment provides a method for preparing a metal / viscoelastic polyamide-imide periodically composite high-temperature damping coating material. The difference from Example 1 is that the thickness of the alloy sheet prepared in this embodiment is 1.5 mm. The other technical features are the same as those in Example 1. The preparation is carried out by the following steps:

[0101] S1. Using Mn-Cu system as the material of alloy thin plate, a 1.5 mm alloy thin plate is prepared by hot rolling process;

[0102] S2. Using the prepared alloy sheet and viscoelastic polyimide in an alternating stacking manner to periodically stack a composite vibration reduction and noise reduction material; wherein the stacking periodic layers are 5 layers;

[0103] S3, using a mold preparation and integrated pressing method to integrate the alloy sheet and the viscoelastic polyamide imide into a whole;

[0104] S3-1. Design a special mold to prepare layered composite materials according to the application object. The principle of mold design is to form a cavity to accommodate the periodic layered composite structure. The cavity is 20mm larger than the overall size of the application object. The upper and lower surfaces of the mold should be supportive planes to achieve compression molding.

[0105] S3-2, using the spraying process, alternately pressing and forming layer by layer, the thickness of each layer is 4mm, forming a layered composite acoustic metamaterial.

[0106] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm using an adhesive application method. An insertion loss test was carried out at 260°C on a pipeline vibration test bench. The excitation spectrum used a specific spectrum. The insertion loss of a 20 mm thick pipeline covering was 7 dB. The insertion loss of a 20 mm thick layered composite covering structure covering could reach up to 17 dB after integration with other vibration reduction components.

[0107] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 108 mm by an adhesive application method. An insertion loss test was performed at 260° C. on a pipeline vibration test bench. White noise was used as the excitation spectrum, and the final insertion loss was 7.5 dB.

[0108] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm using an adhesive application method. An insertion loss test was performed at 200°C under full power operation. After the 20 mm thick pipeline covering was applied, the insertion loss was up to 6 dB.

[0109] Example 7

[0110] This embodiment provides a method for preparing a metal / viscoelastic polyamide-imide periodically composite high-temperature damping coating material. The difference from Example 1 is that the thickness of the alloy sheet prepared in this embodiment is 2 mm. The other technical features are the same as those in Example 1. The preparation is carried out by the following steps:

[0111] S1. Using Mn-Cu system as the material of alloy sheet, a 2 mm alloy sheet is prepared by hot rolling process;

[0112] S2. Using the prepared alloy sheet and viscoelastic polyimide in an alternating stacking manner to periodically stack a composite vibration reduction and noise reduction material; wherein the stacking periodic layers are 5 layers;

[0113] S3, using a mold preparation and integrated pressing method to integrate the alloy sheet and the viscoelastic polyamide imide into a whole;

[0114] S3-1. Design a special mold to prepare layered composite materials according to the application object. The principle of mold design is to form a cavity to accommodate the periodic layered composite structure. The cavity is 20mm larger than the overall size of the application object. The upper and lower surfaces of the mold should be supportive planes to achieve compression molding.

[0115] S3-2, using the spraying process, alternately pressing and forming layer by layer, the thickness of each layer is 4mm, forming a layered composite acoustic metamaterial.

[0116] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm by an adhesive application method. An insertion loss test was carried out at 260°C on a pipeline vibration test bench. The excitation spectrum adopted a specific spectrum. The insertion loss of a 20 mm thick pipeline covering was 6.5 dB. The insertion loss of a 20 mm thick layered composite covering structure covering could reach up to 14 dB after integration with other vibration reduction components.

[0117] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 108 mm by an adhesive application method. An insertion loss test was performed at 260° C. on a pipeline vibration test bench. White noise was used as the excitation spectrum, and the final insertion loss was 6.7 dB.

[0118] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm using an adhesive application method. An insertion loss test was performed at 200°C under full power operation. After the 20 mm thick pipeline covering was applied, the insertion loss was up to 5 dB.

[0119] Example 8

[0120] This embodiment provides a method for preparing a metal / viscoelastic polyamide-imide periodically composite high-temperature damping coating material. The difference from Embodiment 1 is that in this embodiment, nitrile rubber and alloy sheets are alternately stacked to periodically stack the composite vibration reduction and noise reduction material. The other technical features are the same as those of Embodiment 1, and the preparation is performed by the following steps:

[0121] S1. Using Mn-Cu system as the material of the alloy sheet, a 0.5 mm alloy sheet is prepared by hot rolling process;

[0122] S2. The prepared alloy sheet and rubber are alternately stacked to periodically stack a composite vibration reduction and noise reduction material; wherein the stacked periodic layers are 5 layers;

[0123] S3, using a mold preparation and integrated pressing method to integrate the alloy sheet and the viscoelastic polyamide imide into a whole;

[0124] S3-1. Design a special mold to prepare layered composite materials according to the application object. The principle of mold design is to form a cavity to accommodate the periodic layered composite structure. The cavity is 20mm larger than the overall size of the application object. The upper and lower surfaces of the mold should be supportive planes to achieve compression molding.

[0125] S3-2, using the vulcanization process, alternately pressing and forming layer by layer, with each layer having a thickness of 4 mm, to form a layered composite acoustic metamaterial.

[0126] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm using an adhesive application method. An insertion loss test was carried out at 260°C on a pipeline vibration test bench. The excitation spectrum used a specific spectrum. The insertion loss of a 20 mm thick pipeline covering was 6 dB. The insertion loss of a 20 mm thick layered composite covering structure covering could reach up to 16 dB after integration with other vibration reduction components.

[0127] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 108 mm by an adhesive application method. An insertion loss test was performed at 260° C. on a pipeline vibration test bench. White noise was used as the excitation spectrum, and the final insertion loss was 6 dB.

[0128] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm using an adhesive application method. An insertion loss test was performed at 200°C under full power operation. After the application of the 20 mm thick pipeline covering, the insertion loss was up to 7 dB.

[0129] Example 9

[0130] This embodiment provides a method for preparing a metal / viscoelastic polyamide-imide periodically composite high-temperature damping coating material. The difference from Embodiment 1 is that in this embodiment, polyurethane and alloy thin plates are alternately stacked to periodically stack the composite vibration reduction and noise reduction material. The other technical features are the same as those of Embodiment 1, and the preparation is performed by the following steps:

[0131] S1. Using Mn-Cu system as the material of the alloy sheet, a 0.5 mm alloy sheet is prepared by hot rolling process;

[0132] S2. The prepared alloy sheet and polyurethane are alternately stacked to periodically stack a composite vibration reduction and noise reduction material; wherein the stacked periodic layers are 5 layers;

[0133] S3, using a mold preparation and integrated pressing method to integrate the alloy sheet and the viscoelastic polyamide imide into a whole;

[0134] S3-1. Design a special mold to prepare layered composite materials according to the application object. The principle of mold design is to form a cavity to accommodate the periodic layered composite structure. The cavity is 20mm larger than the overall size of the application object. The upper and lower surfaces of the mold should be supportive planes to achieve compression molding.

[0135] S3-2, using the spraying process, alternately pressing and forming layer by layer, the thickness of each layer is 4mm, forming a layered composite acoustic metamaterial.

[0136] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm by an adhesive application method. An insertion loss test was carried out at 260°C on a pipeline vibration test bench. The excitation spectrum adopted a specific spectrum. The insertion loss of a 20 mm thick pipeline covering was 5 dB. The insertion loss of a 20 mm thick layered composite covering structure covering could reach up to 15 dB after integration with other vibration reduction components.

[0137] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 108 mm by an adhesive application method. An insertion loss test was performed at 260° C. on a pipeline vibration test bench. White noise was used as the excitation spectrum, and the final insertion loss was 5.7 dB.

[0138] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm using an adhesive application method. An insertion loss test was performed at 200°C under full power operation. After the application of the 20 mm thick pipeline covering, the insertion loss was up to 7 dB.

[0139] Example 10

[0140] This embodiment provides a method for preparing a metal / viscoelastic polyamide-imide periodically composite high-temperature damping coating material. The difference from Embodiment 1 is that in this embodiment, the alloy sheet and the nitrile rubber alternate periodic layer is one layer. The other technical features are the same as those in Embodiment 1. The material is prepared by the following steps:

[0141] S1. Using Mn-Cu system as the material of the alloy sheet, a 0.5 mm alloy sheet is prepared by hot rolling process;

[0142] S2, using the prepared alloy sheet and rubber in an alternately stacked manner to periodically stack a composite vibration reduction and noise reduction material; wherein the stacked periodic layer is 1 layer;

[0143] S3, using a mold preparation and integrated pressing method to integrate the alloy sheet and the viscoelastic polyamide imide into a whole;

[0144] S3-1. Design a special mold to prepare layered composite materials according to the application object. The principle of mold design is to form a cavity to accommodate the periodic layered composite structure. The cavity is 20mm larger than the overall size of the application object. The upper and lower surfaces of the mold should be supportive planes to achieve compression molding.

[0145] S3-2, using the vulcanization process, alternately pressing and forming layer by layer, with each layer having a thickness of 4 mm, to form a layered composite acoustic metamaterial.

[0146] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm by an adhesive application method. An insertion loss test was carried out at 260°C on a pipeline vibration test bench. The excitation spectrum adopted a specific spectrum. The insertion loss of a 20 mm thick pipeline covering was 11.4 dB. The insertion loss of a 20 mm thick layered composite covering structure covering could reach up to 21 dB after integration with other vibration reduction components.

[0147] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 108 mm by an adhesive application method. An insertion loss test was performed at 260° C. on a pipeline vibration test bench. White noise was used as the excitation spectrum, and the final insertion loss was 11.7 dB.

[0148] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm using an adhesive application method. An insertion loss test was performed at 200°C under full power operation. After the application of the 20 mm thick pipeline covering, the insertion loss was up to 7 dB.

[0149] Embodiment 11

[0150] This embodiment provides a method for preparing a metal / viscoelastic polyamide-imide periodically composite high-temperature damping coating material. The difference from Embodiment 1 is that the alloy sheet and the nitrile rubber alternately have 8 layers in this embodiment. The other technical features are the same as those of Embodiment 1. The preparation is performed by the following steps:

[0151] S1. Using Mn-Cu system as the material of the alloy sheet, a 0.5 mm alloy sheet is prepared by hot rolling process;

[0152] S2. The prepared alloy sheet and rubber are alternately stacked to periodically stack a composite vibration reduction and noise reduction material; wherein the stacked periodic layers are 8 layers;

[0153] S3, using a mold preparation and integrated pressing method to integrate the alloy sheet and the nitrile rubber into a whole;

[0154] S3-1. Design a special mold to prepare layered composite materials according to the application object. The principle of mold design is to form a cavity to accommodate the periodic layered composite structure. The cavity is 20mm larger than the overall size of the application object. The upper and lower surfaces of the mold should be supportive planes to achieve compression molding.

[0155] S3-2, using the vulcanization process, alternately pressing and forming layer by layer, with each layer having a thickness of 4 mm, to form a layered composite acoustic metamaterial.

[0156] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm using an adhesive application method. An insertion loss test was carried out at room temperature on a pipeline vibration test bench. The excitation spectrum used a specific spectrum. The insertion loss of a 20 mm thick pipeline covering was 12.1 dB. The insertion loss of a 20 mm thick layered composite covering structure covering could reach up to 21.4 dB after integration with other vibration reduction components.

[0157] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 108 mm by an adhesive application method. An insertion loss test was performed at room temperature on a pipeline vibration test bench. White noise was used as the excitation spectrum, and the final insertion loss was 12.3 dB.

[0158] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm using an adhesive application method. An insertion loss test was performed at 200°C under full power operation. After the application of the 20 mm thick pipeline covering, the insertion loss was up to 7 dB.

[0159] Example 12

[0160] This embodiment provides a method for preparing a metal / viscoelastic polyamide-imide periodically composite high-temperature damping coating material. The difference from Embodiment 1 is that the alloy sheet and the chloroprene rubber alternately have 8 layers in this embodiment. The other technical features are the same as those of Embodiment 1. The preparation is performed by the following steps:

[0161] S1. Using Mn-Cu system as the material of the alloy sheet, a 0.5 mm alloy sheet is prepared by hot rolling process;

[0162] S2. The prepared alloy sheet and rubber are alternately stacked to periodically stack a composite vibration reduction and noise reduction material; wherein the stacked periodic layers are 8 layers;

[0163] S3, using a mold preparation and integrated pressing method to integrate the alloy sheet and the chloroprene rubber into a whole;

[0164] S3-1. Design a special mold to prepare layered composite materials according to the application object. The principle of mold design is to form a cavity to accommodate the periodic layered composite structure. The cavity is 20mm larger than the overall size of the application object. The upper and lower surfaces of the mold should be supportive planes to achieve compression molding.

[0165] S3-2, using the vulcanization process, alternately pressing and forming layer by layer, with each layer having a thickness of 4 mm, to form a layered composite acoustic metamaterial.

[0166] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm using an adhesive application method. An insertion loss test was carried out at room temperature on a pipeline vibration test bench. The excitation spectrum used a specific spectrum. The insertion loss of a 20 mm thick pipeline covering was 9 dB. The insertion loss of a 20 mm thick layered composite covering structure covering could reach up to 15 dB after integration with other vibration reduction components.

[0167] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 108 mm by an adhesive application method. The insertion loss test was carried out at room temperature on a pipeline vibration test bench. The excitation spectrum used white noise, and the final insertion loss was 8.7 dB.

[0168] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm using an adhesive application method. An insertion loss test was performed at 200°C under full power operation. After the application of the 20 mm thick pipeline covering, the insertion loss was up to 7 dB.

[0169] Example 13

[0170] This embodiment provides a method for preparing a metal / viscoelastic polyamide-imide periodically composite high-temperature damping coating material. The difference from Embodiment 1 is that the alloy sheet and EPDM rubber alternately have 8 layers in this embodiment. The other technical features are the same as those of Embodiment 1. The preparation is performed by the following steps:

[0171] S1. Using Mn-Cu system as the material of the alloy sheet, a 0.5 mm alloy sheet is prepared by hot rolling process;

[0172] S2. The prepared alloy sheet and rubber are alternately stacked to periodically stack a composite vibration reduction and noise reduction material; wherein the stacked periodic layers are 8 layers;

[0173] S3, using a mold preparation and integrated pressing method to integrate the alloy sheet and the EPDM rubber into a whole;

[0174] S3-1. Design a special mold to prepare layered composite materials according to the application object. The principle of mold design is to form a cavity to accommodate the periodic layered composite structure. The cavity is 20mm larger than the overall size of the application object. The upper and lower surfaces of the mold should be supportive planes to achieve compression molding.

[0175] S3-2, using the vulcanization process, alternately pressing and forming layer by layer, with each layer having a thickness of 4 mm, to form a layered composite acoustic metamaterial.

[0176] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm using an adhesive application method. An insertion loss test was carried out at room temperature on a pipeline vibration test bench. The excitation spectrum used a specific spectrum. The insertion loss of a 20 mm thick pipeline covering was 9.5 dB. The insertion loss of a 20 mm thick layered composite covering structure covering can reach up to 16 dB after integration with other vibration reduction components.

[0177] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 108 mm by an adhesive application method. The insertion loss test was carried out at room temperature on a pipeline vibration test bench. The excitation spectrum used white noise, and the final insertion loss was 9.7 dB.

[0178] Embodiment 14

[0179] This embodiment provides a method for preparing a metal / viscoelastic polyamide-imide periodically composite high-temperature damping coating material. The difference from Embodiment 1 is that in this embodiment, there are 10 layers of alternating periodic layers of alloy thin plates and EPDM rubber. The other technical features are the same as those of Embodiment 1. The preparation is performed by the following steps:

[0180] S1. Using Mn-Cu system as the material of alloy thin plate, a 0.1 mm alloy thin plate is prepared by hot rolling process;

[0181] S2. The prepared alloy sheet and rubber are alternately stacked to periodically stack a composite vibration reduction and noise reduction material; wherein the stacked periodic layers are 10 layers;

[0182] S3, using a mold preparation and integrated pressing method to integrate the alloy sheet and the EPDM rubber into a whole;

[0183] S3-1. Design a special mold to prepare layered composite materials according to the application object. The principle of mold design is to form a cavity to accommodate the periodic layered composite structure. The cavity is 20mm larger than the overall size of the application object. The upper and lower surfaces of the mold should be supportive planes to achieve compression molding.

[0184] S3-2, using the vulcanization process, alternately pressing and forming layer by layer, with each layer having a thickness of 4 mm, to form a layered composite acoustic metamaterial.

[0185] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm using an adhesive application method. An insertion loss test was carried out at room temperature on a pipeline vibration test bench. The excitation spectrum used a specific spectrum. The insertion loss of a 20 mm thick pipeline covering was 10.9 dB. The insertion loss of a 20 mm thick layered composite covering structure covering can reach up to 18 dB after integration with other vibration reduction components.

[0186] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 108 mm by an adhesive application method. An insertion loss test was performed at room temperature on a pipeline vibration test bench. White noise was used as the excitation spectrum, and the final insertion loss was 10.7 dB.

[0187] Embodiment 15

[0188] This embodiment provides a method for preparing a metal / viscoelastic polyamide-imide periodically composite high-temperature damping coating material. The difference from Example 1 is that the thickness of each layer of the composite vibration reduction and noise reduction material in this embodiment is 1 mm. The other technical features are the same as those in Example 1. The preparation is performed by the following steps:

[0189] S1. Using Mn-Cu system as the material of alloy thin plate, a 0.1 mm alloy thin plate is prepared by hot rolling process;

[0190] S2. Using the prepared alloy sheet and viscoelastic polyimide in an alternating stacking manner to periodically stack a composite vibration reduction and noise reduction material; wherein the stacking periodic layers are 5 layers;

[0191] S3, using a mold preparation and integrated pressing method to integrate the alloy sheet and the viscoelastic polyamide imide into a whole;

[0192] S3-1. Design a special mold to prepare layered composite materials according to the application object. The principle of mold design is to form a cavity to accommodate the periodic layered composite structure. The cavity is 20mm larger than the overall size of the application object. The upper and lower surfaces of the mold should be supportive planes to achieve compression molding.

[0193] S3-2, using the vulcanization process, alternately pressing and forming layer by layer, with each layer having a thickness of 1 mm, to form a layered composite acoustic metamaterial.

[0194] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm by an adhesive application method. An insertion loss test was carried out at 260°C on a pipeline vibration test bench. The excitation spectrum adopted a specific spectrum. The insertion loss of a 20 mm thick pipeline covering was 9 dB. The insertion loss of a 20 mm thick layered composite covering structure covering could reach up to 18.5 dB after integration with other vibration reduction components.

[0195] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 108 mm by an adhesive application method. An insertion loss test was performed at 260° C. on a pipeline vibration test bench. White noise was used as the excitation spectrum, and the final insertion loss was 9.7 dB.

[0196] Example 16

[0197] This embodiment provides a method for preparing a metal / viscoelastic polyamide-imide periodically composite high-temperature damping coating material. The difference from Example 1 is that the thickness of each layer of the composite vibration reduction and noise reduction material in this embodiment is 8 mm. The other technical features are the same as those in Example 1. The preparation is performed by the following steps:

[0198] S1. Using Mn-Cu system as the material of alloy thin plate, a 0.1 mm alloy thin plate is prepared by hot rolling process;

[0199] S2. Using the prepared alloy sheet and viscoelastic polyimide in an alternating stacking manner to periodically stack a composite vibration reduction and noise reduction material; wherein the stacking periodic layers are 5 layers;

[0200] S3, using a mold preparation and integrated pressing method to integrate the alloy sheet and the viscoelastic polyamide imide into a whole;

[0201] S3-1. Design a special mold to prepare layered composite materials according to the application object. The principle of mold design is to form a cavity to accommodate the periodic layered composite structure. The cavity is 20mm larger than the overall size of the application object. The upper and lower surfaces of the mold should be supportive planes to achieve compression molding.

[0202] S3-2, adopt spraying technology, press and form alternately layer by layer, the thickness of each layer is 8mm, and a layered composite acoustic metamaterial is formed.

[0203] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm by an adhesive application method. An insertion loss test was carried out at 260°C on a pipeline vibration test bench. The excitation spectrum adopted a specific spectrum. The insertion loss of a 20 mm thick pipeline covering was 10 dB. The insertion loss of a 20 mm thick layered composite covering structure covering could reach up to 22 dB after integration with other vibration reduction components.

[0204] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 108 mm by an adhesive application method. An insertion loss test was performed at 260° C. on a pipeline vibration test bench. White noise was used as the excitation spectrum, and the final insertion loss was 9.7 dB.

[0205] Embodiment 17

[0206] This embodiment provides a method for preparing a metal / viscoelastic polyamide-imide periodically composite high-temperature damping coating material. The difference from Example 1 is that the thickness of each layer of the composite vibration reduction and noise reduction material in this embodiment is 10 mm. The other technical features are the same as those in Example 1. The preparation is performed by the following steps:

[0207] S1. Using Mn-Cu system as the material of alloy thin plate, a 0.1 mm alloy thin plate is prepared by hot rolling process;

[0208] S2. Using the prepared alloy sheet and viscoelastic polyimide in an alternating stacking manner to periodically stack a composite vibration reduction and noise reduction material; wherein the stacking periodic layers are 5 layers;

[0209] S3, using a mold preparation and integrated pressing method to integrate the alloy sheet and the viscoelastic polyamide imide into a whole;

[0210] S3-1. Design a special mold to prepare layered composite materials according to the application object. The principle of mold design is to form a cavity to accommodate the periodic layered composite structure. The cavity is 20mm larger than the overall size of the application object. The upper and lower surfaces of the mold should be supportive planes to achieve compression molding.

[0211] S3-2, using the spraying process, alternately pressing and forming layer by layer, with each layer having a thickness of 10 mm, to form a layered composite acoustic metamaterial.

[0212] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 57 mm by an adhesive application method. An insertion loss test was carried out at 260°C on a pipeline vibration test bench. The excitation spectrum adopted a specific spectrum. The insertion loss of a 20 mm thick pipeline covering was 11.4 dB. The insertion loss of a 20 mm thick layered composite covering structure covering could reach up to 21 dB after integration with other vibration reduction components.

[0213] The layered composite acoustic metamaterial prepared in this embodiment was applied to a high-temperature pipeline with a diameter of 108 mm by an adhesive application method. An insertion loss test was performed at 260° C. on a pipeline vibration test bench. White noise was used as the excitation spectrum, and the final insertion loss was 11.7 dB.

[0214] Comparative Example 1

[0215] This comparative example provides a method for preparing a composite vibration reduction and noise reduction material. The difference from Example 1 is that in this comparative example, an alloy sheet and ultrafine glass fiber are used for compounding. The other technical features are the same as those of Example 1. The preparation is carried out by the following steps:

[0216] S1. Using Mn-Cu system as the material of alloy thin plate, a 0.1 mm alloy thin plate is prepared by hot rolling process;

[0217] S2. The prepared alloy sheet and ultrafine glass fiber are alternately stacked to periodically stack a composite vibration reduction and noise reduction material; wherein the stacked periodic layers are 5 layers;

[0218] S3, using a mold preparation and integrated pressing method to integrate the alloy sheet and the viscoelastic polyamide imide into a whole;

[0219] S3-1. Design a special mold to prepare layered composite materials according to the application object. The principle of mold design is to form a cavity to accommodate the periodic layered composite structure. The cavity is 20mm larger than the overall size of the application object. The upper and lower surfaces of the mold should be supportive planes to achieve compression molding.

[0220] S3-2, using the spraying process, alternately pressing and forming layer by layer, the thickness of each layer is 4mm, forming a layered composite acoustic metamaterial.

[0221] Comparative Example 2

[0222] This comparative example provides a method for preparing a composite vibration reduction and noise reduction material. The difference from Example 1 is that in this comparative example, an alloy sheet and a polished rod are used for compounding. The other technical features are the same as those of Example 1. The preparation is performed by the following steps:

[0223] S1. Using Mn-Cu system as the material of alloy thin plate, a 0.1 mm alloy thin plate is prepared by hot rolling process;

[0224] S2. The prepared alloy thin plates and polished rods are alternately stacked to periodically stack a composite vibration reduction and noise reduction material; wherein the stacked periodic layers are 5 layers;

[0225] S3, using a mold preparation and integrated pressing method to integrate the alloy sheet and the viscoelastic polyamide imide into a whole;

[0226] S3-1. Design a special mold to prepare layered composite materials according to the application object. The principle of mold design is to form a cavity to accommodate the periodic layered composite structure. The cavity is 20mm larger than the overall size of the application object. The upper and lower surfaces of the mold should be supportive planes to achieve compression molding.

[0227] S3-2, using the spraying process, alternately pressing and forming layer by layer, the thickness of each layer is 4mm, forming a layered composite acoustic metamaterial.

[0228] The materials prepared in Example 1, Comparative Example 1 and Comparative Example 2 were tested, and the test results are shown in the following table.

[0229] Table 1 Application average acceleration test results Unit: dB (a0 = 10 -6 m / s 2 )(RMS)

[0230] Measurement point direction Bare Ultrafine glass fiber Example 1 Average acceleration level 148 149.9 138.5

[0231] The use results show that the vibration of the ultra-fine glass fiber is amplified compared with that of the light rod, and the vibration of Example 1 is effectively reduced by 9.5dB.

[0232] The following performance tests were conducted on the metal / viscoelastic polyamideimide periodically composite high-temperature damping coating materials prepared by the methods of Examples 1 to 17:

[0233] 1. Under the condition of 260°C, the damping loss factor of the high-temperature damping coating material prepared in each embodiment is not less than 0.2;

[0234] 2. Passed a series of environmental adaptability evaluations, as follows:

[0235] 1) A 96-hour, 4% salt spray test was conducted, with the test device being sprayed with salt spray and dried alternately;

[0236] 2) A 48-hour high and low temperature alternating test at 25°C to 260°C was conducted;

[0237] 3) A total dose of 1×10 5 Gy radiation resistance test.

[0238] After the above tests, the samples prepared in each embodiment were found to be intact in appearance and structure after the test, without any abnormalities such as discoloration or corrosion.

[0239] 4) According to GB / T10707-2008 "Determination of Combustion Performance of Rubber" Method A-Oxygen Index Method, the flame retardant performance of the material was tested, and the oxygen index was as high as 60% (V / V).

[0240] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that it is still possible to modify the technical solutions described in the aforementioned embodiments, or to replace some or all of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A method for preparing a metal / viscoelastic polyamideimide periodically composite high-temperature damping coating material, characterized in that: The following steps are involved: A metal sheet of 0.05 mm to 5 mm is prepared in advance, and the prepared metal sheet and viscoelastic polyamideimide are periodically alternately stacked, and the sheet and the viscoelastic polyamideimide are integrated by periodic molding or integrated pressing to form a periodic composite high-temperature damping coating material.

2. The method for preparing a metal / viscoelastic polyamideimide periodic composite high-temperature damping coating material according to claim 1, characterized in that: The alloy thin plate includes a metal thin plate and a damping alloy thin plate; the metal thin plate includes any one or a combination of aluminum plate, copper plate and iron plate; the damping alloy thin plate includes any one of Mn-Cu series, Fe-Cr series, Fe-Mn series and Ti-Nb series.

3. The method for preparing a metal / viscoelastic polyamideimide periodic composite high-temperature damping coating material according to claim 1, characterized in that: The material for preparing the metal thin plate includes an alloy thin plate, and the shape of the prepared metal thin plate includes a corrugated shape or a Great Wall shape.

4. The method for preparing a metal / viscoelastic polyamideimide periodic composite high-temperature damping coating material according to claim 3, characterized in that: When a corrugated metal sheet is prepared, the corrugated shape includes a circular arc or a sinusoidal shape.

5. The method for preparing a metal / viscoelastic polyamideimide periodic composite high-temperature damping coating material according to claim 1, characterized in that: The viscoelastic polyamideimide comprises viscoelastic polyamideimide and a bulk doping material thereof. The polyimide is resistant to high temperatures and has a loss factor of 0.2 to 0.8 at 260°C.

6. The method for preparing a metal / viscoelastic polyamideimide periodic composite high-temperature damping coating material according to claim 1, characterized in that: The alloy thin plate is prepared by hot rolling or cold rolling.

7. The method for preparing a metal / viscoelastic polyamideimide periodic composite high-temperature damping coating material according to claim 1, characterized in that: The number of periodic layers of the thin plate and the viscoelastic polyamideimide is 3 or more.

8. The method for preparing a metal / viscoelastic polyamideimide periodic composite high-temperature damping coating material according to claim 1, characterized in that: The prepared composite vibration-damping and noise-reducing material has a shape of a plate and a curved tile.

9. The method for preparing a metal / viscoelastic polyamideimide periodic composite high-temperature damping coating material according to claim 1, characterized in that: The viscoelastic polyamideimide is attached to the metal sheet by spraying, brushing or rolling, and is alternately pressed layer by layer. The thickness of each layer of the viscoelastic polymer is 0.1 mm to 10 mm.

10. The method for preparing a metal / viscoelastic polyamideimide periodic composite high temperature damping coating material according to claim 1, characterized in that: The prepared high-temperature damping coating material can withstand a high temperature of 260°C.

11. A metal / viscoelastic polyamide-imide periodic composite high-temperature damping coating material, characterized in that: The method is prepared by any one or more combinations of claims 1 to 11.

12. Application of a metal / viscoelastic polyamideimide periodic composite high-temperature damping coating material, characterized in that: The formed high-temperature damping coating material is fixed to the surface of the application object by adhesive application or rivet fastening method.

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