A high-damping vibration reduction composite material for pipelines and its preparation method

Abstract

This invention discloses a high-damping vibration-damping composite material for pipelines and its preparation method, belonging to the technical field of pipeline vibration-damping material preparation. It consists of a damping layer and a constraint layer. The damping layer is a multi-component polyurethane system cured in one step, with sheet mica and graphene as fillers to enhance damping performance. Polyester polyol, small-molecule chain extender, organotin catalyst, isocyanate, curing agent, sheet mica powder, and graphene are thoroughly stirred evenly under vacuum to remove air bubbles, and then poured into a mold coated with an organosilicon release agent. The mixture is then dried and allowed to mature statically. The constraint layer is made by mixing epoxy resin and curing agent in a specific ratio and coating it onto the surface of the damping layer, used to improve the overall structural stability of the composite material during pipeline use. The high-damping vibration-damping composite material for pipelines prepared by this invention has excellent vibration-damping performance, high strength, and excellent chemical stability, and can be applied to vibration reduction and noise reduction of pipelines and other equipment in special scenarios.

Description

Technical Field

[0001] This invention belongs to the field of pipeline vibration reduction material preparation technology, specifically relating to a high-damping vibration reduction composite material for pipelines and its preparation method. Background Technology

[0002] With the rapid development of modern industry, pipeline systems are widely used in petroleum, chemical, natural gas, water supply, and heating industries. During operation, these pipelines are inevitably affected by external factors such as mechanical vibration, ambient temperature changes, and fluid impact, resulting in noise, stress concentration, and fatigue damage. Prolonged vibration not only reduces the service life of pipelines but also affects the normal operation of surrounding equipment and can even lead to safety accidents. Therefore, effectively reducing pipeline vibration and improving the system's vibration reduction effect has become a crucial issue in pipeline engineering. Traditional vibration reduction materials mainly rely on rubber, asphalt, or certain polymer materials. However, these materials are prone to aging, insufficient durability, and performance degradation under high-frequency vibration and long-term use. Furthermore, ordinary vibration reduction materials often present a contradiction between mechanical properties and damping performance, making it difficult to meet the vibration reduction requirements in complex environments. Therefore, developing a vibration reduction material that simultaneously possesses high damping performance, good mechanical strength, and durability is particularly important.

[0003] Polyurethane materials have been widely used in vibration reduction and noise reduction due to their excellent mechanical properties, wear resistance, aging resistance, and processing adaptability. However, polyurethane alone has limited performance in high damping, making it difficult to meet the vibration reduction requirements under long-term and complex working conditions. To further improve the vibration reduction effect of polyurethane materials, researchers have begun to add various fillers, such as mica, calcium carbonate, and silicates, to the polyurethane system to enhance its mechanical strength and damping performance. However, the addition of traditional fillers often leads to increased material hardness, decreased flexibility, and insignificant vibration reduction effect.

[0004] In response to the technical problems of poor mechanical properties and short service life of existing pipeline vibration damping materials, there is an urgent need to find a new pipeline vibration damping material that can maintain good mechanical strength and chemical stability under high-intensity vibration environment. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention aims to provide a high-damping vibration reduction composite material for pipelines and its preparation method, so as to solve the technical problems of poor mechanical properties and short service life of existing vibration reduction materials for pipelines.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] This invention discloses a method for preparing a high-damping vibration-reducing composite material for pipelines, comprising the following steps:

[0008] Polyol, chain extender, metal catalyst, isocyanate, crosslinking curing agent, mica powder and graphene are mixed and stirred evenly, and after degassing, they are poured into a mold, dried, cured and shaped, and after aging, a damping layer is obtained; then, epoxy resin and curing agent are mixed evenly and poured into a mold to obtain a constraint layer; finally, the constraint layer is bonded to the surface of the damping layer with epoxy resin adhesive to obtain a high-damping vibration reduction composite material for pipelines.

[0009] Preferably, the mass ratio of polyol, chain extender, metal catalyst, isocyanate, crosslinking curing agent, mica powder and graphene is (40~75):(4~10):(0.05~0.2):(15~45):(5~15):(5~12):(1~3).

[0010] Preferably, the thickness of the damping layer is 10~15mm, the thickness of the constraint layer is 12~30mm, and the thickness ratio of the constraint layer to the damping layer is (1.2~2):1.

[0011] Preferably, the polyol is at least one selected from polytetrahydrofurandiol, polypropylene oxide diol, polycarbonate, and polyhexanediol neopentyl glycol adipate; wherein the relative molecular mass of polytetrahydrofurandiol is 1000 g / mol, the relative molecular mass of polypropylene oxide polyol is 1000 g / mol, and the relative molecular mass of polyhexanediol neopentyl glycol adipate is 2000 g / mol.

[0012] Chain extenders include hydroxyl chain extenders and amino chain extenders; the hydroxyl chain extender is at least one of 1,4-butanediol, ethylene glycol, propylene glycol, trimethylolpropane, neopentyl glycol, adipate alcohol and dimethylolpropionic acid, and the amino chain extender is at least one of sodium ethylenediaminoethanesulfonate and isophorone diamine;

[0013] The metal catalyst is any one of stannous octoate, dibutyltin dilaurate, organotin Ti2, and triphenyltin;

[0014] The isocyanate is at least one of toluene diisocyanate, dicyclohexylmethane diisocyanate, diphenylmethane diisocyanate, lysine diisocyanate, and isophorone diisocyanate;

[0015] The crosslinking curing agent is at least one of hydroxyethyl ethylenediamine, trimethylolpropane, castor oil, and pentaerythritol.

[0016] Preferably, the particle size of mica powder is 1~100μm; the particle size of graphene is 1~50nm; the order of adding mica powder and graphene is to add mica powder first and then graphene, and to stir thoroughly after each addition at a stirring rate of 300~500rpm / min.

[0017] Preferably, the epoxy resin is at least one of E20, E44 and E51; the curing agent is a polyamine or an amine derivative.

[0018] Preferably, the curing temperature is 60~120℃ and the curing time is 2~24 h.

[0019] Preferably, the vacuum degree of degassing is -0.01 to -0.1 MPa, and the degassing time is 1 to 2 hours.

[0020] Preferably, the damping layer and the constraint layer are bonded by hot pressing during the bonding process.

[0021] This invention discloses a high-damping vibration reduction composite material for pipelines prepared by the above-mentioned method, comprising a damping layer and a constraint layer coated on the surface of the damping layer; the damping layer contains fillers, including sheet mica and graphene.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] This invention discloses a method for preparing a high-damping vibration-damping composite material for pipelines. Through a composite structure design of a damping layer and a constraint layer, particularly the introduction of mica and graphene fillers into the damping layer, the material exhibits superior damping performance. Mica, as a layered filler, effectively improves the internal friction of the material, while graphene possesses excellent thermal conductivity and mechanical strength. The combined effect of these two significantly enhances the vibration reduction effect, making it particularly suitable for vibration and noise suppression in pipelines. Durability is also enhanced. Simultaneously, by using epoxy resin as the constraint layer, the structural strength and weather resistance of the material are improved, enabling it to better resist aging and corrosion in harsh environments. Furthermore, epoxy resin has high adhesion and mechanical strength, forming a good composite effect with the polyurethane system damping layer, extending the material's service life. Compared to traditional vibration-damping materials, the high-damping vibration-damping composite material for pipelines prepared by this invention maintains high-efficiency vibration reduction capabilities while utilizing the lightweight and flexibility of the polyurethane system. This allows the material to better conform to the pipeline structure during application without increasing the pipeline load, making it particularly suitable for large-scale industrial pipeline systems. This invention allows for flexible adjustment of the damping characteristics of the damping layer by varying the amounts of mica and graphene added, thereby achieving customized vibration reduction requirements under different operating conditions. This enables the material to be widely used in pipes of different types and sizes, providing broader adaptability. This invention not only significantly outperforms existing technologies in terms of vibration reduction performance, lightweight, durability, and customized design, but also boasts a simple manufacturing process and low production cost, overcoming many shortcomings of existing technologies and meeting the urgent need for high-performance vibration reduction materials in modern pipeline systems.

[0024] This invention also discloses a high-damping vibration-damping composite material for pipelines prepared by the above-mentioned method, comprising a damping layer and a constraint layer coated on the surface of the damping layer; the damping layer contains fillers, including sheet mica and graphene; the damping layer is a multi-component polyurethane system cured in one step, with sheet mica and graphene used as fillers to enhance damping performance; the constraint layer is coated on the surface of the damping layer to improve the overall structural stability of the composite material during pipeline use. The high-damping vibration-damping composite material for pipelines prepared by this invention has excellent vibration reduction performance, high strength, and excellent chemical stability, and can be applied to vibration reduction and noise reduction of pipelines and other equipment in special scenarios. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "first," "second," etc., used in the specification and claims of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0027] The present invention will be further described in detail below with reference to embodiments:

[0028] Graphene, as a novel two-dimensional material, is increasingly being applied in the research of various composite materials due to its excellent mechanical properties, electrical and thermal conductivity, and high specific surface area. The addition of graphene can not only significantly improve the mechanical properties of materials but also enhance the damping performance and durability of composite materials. Furthermore, the nanosheet structure of graphene can effectively improve the gas barrier performance of materials, thereby improving their protective performance and service life. Mica, as a layered silicate mineral, possesses excellent insulation, chemical stability, and high-temperature resistance. Adding mica to polyurethane materials can not only improve the heat resistance and mechanical properties of the material but also enhance its damping effect, giving the material better stability in complex environments. Simultaneously, this invention uses epoxy resin as the constraint layer of the composite material. Epoxy resin has excellent mechanical properties, chemical corrosion resistance, and good adhesion, maintaining its structural stability under various harsh working conditions. At the same time, the low shrinkage rate and excellent curing performance of epoxy resin allow for precise dimensional control during molding and form a good composite effect with the polyurethane damping layer. In addition, epoxy resin exhibits a certain damping effect under vibration, which can help improve the overall vibration reduction performance of the material. Based on this, the present invention prepares a high-damping vibration reduction material for pipelines by introducing graphene and mica as fillers into a polyurethane damping layer and combining it with epoxy resin as a confining layer. This material not only has excellent vibration reduction performance, but also maintains good mechanical strength and chemical stability under high-intensity vibration environments. It is particularly suitable for industrial pipeline systems that operate for long periods of time, significantly extending the service life of pipelines and improving operational safety.

[0029] This invention discloses a method for preparing a high-damping vibration reduction composite material for pipelines. The composite material consists of a damping layer and a constraint layer. The damping layer is formed by one-step curing of a multi-component polyurethane system, in which sheet mica and graphene are added as fillers to enhance the damping performance. The components are composed of the following raw materials:

[0030] The damping layer comprises 40-75 parts of polyol, 4-10 parts of hydroxyl and amine chain extenders, 0.05-0.2 parts of metal catalyst, 15-45 parts of isocyanate, 5-15 parts of crosslinking curing agent, 5-12 parts of flake mica powder, and 1-3 parts of graphene. All components are placed in a four-necked flask and stirred evenly. The mixture is then degassed under vacuum to remove air bubbles. The resulting solution is poured into a polytetrafluoroethylene mold coated with a polyurethane release agent, dried in a forced-air oven, and cured. After curing, the mold is allowed to stand at room temperature for a period of time to mature, thus obtaining the damping layer.

[0031] The restraint layer is made by mixing epoxy resin and curing agent in a 10:1 ratio and coating it onto the surface of the damping layer. It is used to improve the overall structural stability of the composite material during pipeline use.

[0032] The constraint layer is bonded to the surface of the damping layer with epoxy resin adhesive to obtain a high-damping vibration reduction composite material for pipelines.

[0033] Preferably, the high-damping vibration reduction composite material for pipelines consists of a damping layer and a constraint layer. The thickness of the damping layer is 10~15mm, the thickness of the constraint layer is 12~30mm, and the thickness ratio of the constraint layer to the damping layer is (1.2~2):1.

[0034] Preferably, the polyol is one or more components selected from polytetrahydrofurandiol, polypropylene oxide diol, and polyhexanediol neopentyl glycol adipate. The polytetrahydrofurandiol has a relative molecular mass of 1000 g / mol, the polypropylene oxide polyol has a relative molecular mass of 1000 g / mol, and the polyhexanediol neopentyl glycol adipate has a relative molecular mass of 2000 g / mol.

[0035] Preferably, the hydroxyl chain extender is one or a combination of 1,4-butanediol, ethylene glycol, propylene glycol, trimethylolpropane, neopentyl glycol, adipate alcohol, and dimethylolpropionic acid, and the amine chain extender is one or a combination of two of ethylenediaminoethanesulfonate and isophorone diamine.

[0036] Preferably, the metal catalyst is one of stannous octoate, dibutyltin dilaurate, organotin TiO2, and triphenyltin. Stannous octoate is preferred.

[0037] Preferably, the isocyanate is one or more components selected from toluene diisocyanate, 4,4-diphenylmethane diisocyanate, hexamethylene diisocyanate, dicyclohexylmethane diisocyanate, and isophorone diisocyanate.

[0038] Preferably, the crosslinking curing agent is one or more components selected from hydroxyethyl ethylenediamine, trimethylolpropane, castor oil, and pentaerythritol.

[0039] Preferably, the particle size of the mica is 1~100μm.

[0040] Preferably, the graphene particle size is 1~50 nm.

[0041] Preferably, the mica and graphene are added in the following order: mica is added first, followed by graphene, and the mixture is thoroughly stirred after each addition.

[0042] Preferably, the stirring speed is 300~500 rpm / min.

[0043] Preferably, the epoxy resin is one or more of E20, E44, and E51.

[0044] Preferably, the curing agent for the epoxy resin is an amine-based curing agent.

[0045] Preferably, the amine curing agent is a polyamine or an amine derivative.

[0046] Preferably, the curing temperature is 60~120℃ and the curing time is 2~24h.

[0047] Preferably, the vacuum degree during degassing is -0.01 to -0.1 MPa, and the degassing time is 1 to 2 hours.

[0048] Preferably, the damping layer and the constraint layer are formed by hot pressing during the curing process to improve the composite strength of the material.

[0049] Preferably, the final processing of the material may include cutting, grinding, and surface treatment steps to meet the specific size and shape requirements of different piping applications.

[0050] The composite material prepared by the above-mentioned high-damping vibration-damping polyurethane is used as a vibration-damping material for special pipelines in nuclear power plants and other applications.

[0051] Example 1

[0052] A method for preparing a high-damping vibration-reducing composite material for pipelines includes the following steps:

[0053] First, weigh 48g of polyoxypropylene polyol, 4.58g of neopentyl glycol, and 0.2mL of dibutyltin dilaurate. Stir evenly using a high-speed mixer at 500rpm / min. Vacuum dewatering was carried out at 110℃ and -0.095MPa for 3 hours. When the moisture content was <0.1wt%, vacuum dewatering was stopped, and the mixture was cooled to room temperature to obtain component A. Next, weigh 18g of lysine diisocyanate and 8.75g of hydroxyethyl ethylenediamine. Stir evenly using a high-speed mixer at 500rpm / min. Then, weigh 6.0g of 80μm flake mica powder and 2g of 40nm graphene and incorporate them into the mixture. Disperse evenly using a high-speed mixer at 450rpm / min, avoiding powder clumping. After dispersion, component B is obtained. Components A and B were poured into the same four-necked flask and stirred evenly using a high-speed mixer at 500 rpm / min. After stirring, the mixture was placed in a vacuum oven and degassed for 1.5 hours at room temperature and a vacuum of -0.01 MPa. The degassed reactants were then poured into a custom-made PTFE mold coated with a silicone release agent and placed in the vacuum oven. First, the mixture was dried at 40°C for 6 hours until it was basically cured and formed. Then, the temperature was increased to 90°C and the drying continued for 12 hours. Finally, it was cured at room temperature for 7 days to produce a 12 mm thick damping layer of polyurethane composite material for pipe vibration reduction. Then, 100 g of bisphenol A epoxy resin and 3.8 g of polyamide were mixed evenly and poured into a custom-made mold to obtain a 15 mm thick constraint layer. The constraint layer and the damping layer were bonded together using an epoxy resin adhesive to obtain a high-damping vibration-reducing composite material for pipes.

[0054] Example 2

[0055] A method for preparing a high-damping vibration-reducing composite material for pipelines includes the following steps:

[0056] First, weigh 51g of polyhexamethylene adipate neopentyl glycol ester, 5.04g of trimethylolpropane, and 0.2mL of organotin T12. Stir evenly using a high-speed mixer at 500rpm / min. Vacuum dewatering was carried out at 110℃ and -0.095MPa for 3 hours. When the moisture content was <0.1wt%, vacuum dewatering was stopped, and the mixture was allowed to cool to room temperature to obtain component A. Next, weigh 30.47g of diphenylmethane diisocyanate and 8.82g of castor oil. Stir evenly using a high-speed mixer at 500rpm / min. Then, weigh 5.3g of flaky mica powder with a particle size of 20μm and 1.5g of graphene with a particle size of 45nm and incorporate them into the mixture. Disperse evenly using a high-speed mixer at 400rpm / min to prevent powder clumping. Once dispersion is complete, component B is obtained. Components A and B were poured into the same four-necked flask and stirred evenly using a high-speed stirrer at 500 rpm / min. After stirring, the mixture was placed in a vacuum oven and degassed for 1.5 hours at room temperature and a vacuum of -0.01 MPa. The degassed reactants were then poured into a custom-made polytetrafluoroethylene mold coated with an organosilicon release agent and placed in the vacuum oven. First, the mixture was dried at 40°C for 6 hours until it was basically cured and formed. Then, the temperature was increased to 90°C and the drying continued for 12 hours. Finally, it was cured at room temperature for 7 days to produce a 12 mm thick damping layer of polyurethane composite material for pipe vibration reduction. Then, 100 g of bisphenol A epoxy resin and 3.8 g of polyamide were mixed evenly and poured into a custom-made mold to obtain a 15 mm thick constraint layer. The constraint layer and the damping layer were bonded together using an epoxy resin adhesive to obtain a high-damping vibration-reducing composite material for pipes.

[0057] Example 3

[0058] A method for preparing a high-damping vibration-reducing composite material for pipelines includes the following steps:

[0059] First, weigh 40g of polypropylene glycol, 7.36g of neopentyl glycol, and 0.2mL of dibutyltin dilaurate. Stir evenly using a high-speed mixer at 500rpm / min. Vacuum dewatering is then carried out at 110℃ and -0.095MPa for 3 hours. When the moisture content is <0.1wt%, vacuum dewatering is stopped, and the mixture is allowed to cool to room temperature, yielding component A. Next, weigh 22.65g of cyclohexylmethane diisocyanate and 7.85g of pentaerythritol. Stir evenly using a high-speed mixer at 500rpm / min. Then, weigh 6.4g of flake mica powder and 2.0g of graphene and incorporate them into the mixture. Disperse evenly using a high-speed mixer at 500rpm / min, avoiding powder clumping. Once dispersion is complete, component B is obtained. Components A and B were poured into the same four-necked flask and stirred evenly using a high-speed stirrer at 500 rpm / min. After stirring, the mixture was placed in a vacuum oven and degassed for 1.0 h at room temperature and a vacuum of -0.01 MPa. The degassed reactants were poured into a custom-made polytetrafluoroethylene mold coated with an organosilicon release agent and placed in the vacuum oven. First, the mixture was dried at 40°C for 6 h. After it had basically solidified, the temperature was increased to 90°C and the drying continued for 12 h. Finally, it was cured at room temperature for 7 days to produce a 12 mm thick damping layer of polyurethane composite material for pipe vibration reduction. Then, 100 g of bisphenol A epoxy resin and 3.8 g of polyamide were mixed evenly and poured into a custom-made mold to obtain a 13.5 mm thick constraint layer. The constraint layer and the damping layer were bonded together with epoxy resin adhesive to obtain a high-damping vibration-reducing composite material for pipes.

[0060] Example 4

[0061] A method for preparing a high-damping vibration-reducing composite material for pipelines includes the following steps:

[0062] First, weigh 60g of polytetrahydrofuran diol, 7.8g of sodium ethylenediamine ethanesulfonate, and 0.2mL of triphenyltin. Stir evenly using a high-speed mixer at 500rpm / min. Vacuum dewatering was carried out at 110℃ and -0.095MPa for 3 hours. When the moisture content was <0.1wt%, vacuum dewatering was stopped, and the mixture was cooled to room temperature to obtain component A. Next, weigh 22.16g of isophorone diisocyanate and 5.52g of trimethylolpropane. Stir evenly using a high-speed mixer at 500rpm / min. Then, weigh 10g of flaky mica powder with a particle size of 65μm and 2.5g of graphene with a particle size of 32nm and incorporate them into the mixture. Disperse evenly using a high-speed mixer at 450rpm / min to avoid powder clumping. After dispersion, component B is obtained. Components A and B were poured into the same four-necked flask and stirred evenly using a high-speed stirrer at 500 rpm / min. After stirring, the mixture was placed in a vacuum oven and degassed for 1.5 hours at room temperature and a vacuum of -0.01 MPa. The degassed reactants were then poured into a custom-made polytetrafluoroethylene mold coated with a silicone release agent and placed in the vacuum oven. First, the mixture was dried at 40°C for 6 hours until it was basically cured and formed. Then, the temperature was increased to 90°C and the drying continued for 12 hours. Finally, it was cured at room temperature for 7 days to produce a 12 mm thick damping layer of polyurethane composite material for pipe vibration reduction. Then, 100 g of bisphenol A epoxy resin and 3.8 g of polyamide were mixed evenly and poured into a custom-made mold to obtain a 19.6 mm thick constraint layer. The constraint layer and the damping layer were bonded together using an epoxy resin adhesive to obtain a high-damping vibration-reducing composite material for pipes.

[0063] Example 5

[0064] A method for preparing a high-damping vibration-reducing composite material for pipelines includes the following steps:

[0065] First, weigh 70g of polycarbonate, 8.31g of dimethylolpropionic acid, and 0.2mL of stannous octoate. Stir the mixture thoroughly using a high-speed mixer at 500rpm / min. Vacuum dewatering is then carried out at 110℃ and -0.095MPa for 3 hours. When the moisture content is found to be <0.1wt%, vacuum dewatering is stopped, and the mixture is allowed to cool to room temperature, yielding component A. Next, weigh 30.15g of toluene diisocyanate and 8.51g of trimethylolpropane. Stir the mixture thoroughly using a high-speed mixer at 500rpm / min. Then, weigh 8g of 74μm flake mica powder and 2.3g of 20nm graphene and incorporate them into the mixture. Disperse the powder evenly using a high-speed mixer at 500rpm / min, avoiding clumping. Once dispersion is complete, component B is obtained. Components A and B were poured into the same four-necked flask and stirred evenly using a high-speed mixer at 500 rpm / min. After stirring, the mixture was placed in a vacuum oven and degassed for 2 hours at room temperature and a vacuum of -0.01 MPa. The degassed reactants were then poured into a custom-made PTFE mold coated with a silicone release agent and placed in the vacuum oven. First, the mixture was dried at 40°C for 6 hours until it was basically cured and formed. Then, the temperature was increased to 90°C and the drying continued for 12 hours. Finally, it was cured at room temperature for 7 days to produce a 12 mm thick damping layer of polyurethane composite material for pipe vibration reduction. Then, 100 g of bisphenol A epoxy resin and 3.8 g of polyamide were mixed evenly and poured into a custom-made mold to obtain a 12 mm thick constraint layer. The constraint layer and the damping layer were bonded together using an epoxy resin adhesive to obtain a high-damping vibration-reducing composite material for pipes.

[0066] Example 6

[0067] A method for preparing a high-damping vibration-reducing composite material for pipelines includes the following steps:

[0068] First, weigh 40g of polyhexamethylene adipate neopentyl glycol ester, 4g of 1,4-butanediol, and 0.05mL of organotin T12. Stir evenly using a high-speed mixer at 500rpm / min. Vacuum dewatering is then carried out at 110℃ and -0.095MPa for 3 hours. When the moisture content is <0.1wt%, vacuum dewatering is stopped, and the mixture is allowed to cool to room temperature, yielding component A. Next, weigh 15g of dicyclohexylmethane diisocyanate and 5g of castor oil. Stir evenly using a high-speed mixer at 500rpm / min. Then, weigh 5g of 1μm flake mica powder and 1g of 1nm graphene and incorporate them into the mixture. Disperse evenly using a high-speed mixer at 300rpm / min, avoiding powder clumping. Once dispersion is complete, component B is obtained. Components A and B were poured into the same four-necked flask and stirred evenly using a high-speed stirrer at 500 rpm / min. After stirring, the mixture was placed in a vacuum oven and degassed for 1 hour at room temperature and a vacuum of -0.01 MPa. The degassed reactants were then poured into a custom-made PTFE mold coated with a silicone release agent and placed in the vacuum oven. First, the mixture was dried at 40°C for 6 hours until it was basically cured and formed. Then, the temperature was increased to 60°C and the drying continued for 24 hours. Finally, it was cured at room temperature for 7 days to produce a 12 mm thick damping layer of polyurethane composite material for pipe vibration reduction. Then, 100 g of E20 epoxy resin and 3.8 g of polyamide were mixed evenly and poured into a custom-made mold to obtain a 12 mm thick constraint layer. The constraint layer and the damping layer were bonded together using epoxy resin adhesive to obtain a high-damping vibration-reducing composite material for pipes.

[0069] Example 7

[0070] A method for preparing a high-damping vibration-reducing composite material for pipelines includes the following steps:

[0071] First, weigh 75g of polyhexamethylene adipate neopentyl glycol ester, 10g of ethylene glycol, and 0.2mL of organotin T12. Stir evenly using a high-speed mixer at 500rpm / min. Vacuum dewatering is then carried out at 110℃ and -0.095MPa for 3 hours. When the moisture content is <0.1wt%, vacuum dewatering is stopped, and the mixture is allowed to cool to room temperature to obtain component A. Next, weigh 45g of diphenylmethane diisocyanate and 15g of castor oil. Stir evenly using a high-speed mixer at 500rpm / min. Then, weigh 12g of 100μm flake mica powder and 3g of 50nm graphene and incorporate them into the mixture. Disperse evenly using a high-speed mixer at 500rpm / min, avoiding powder clumping. Once dispersion is complete, component B is obtained. Components A and B were poured into the same four-necked flask and stirred evenly using a high-speed stirrer at 500 rpm / min. After stirring, the mixture was placed in a vacuum oven and degassed for 2 hours at room temperature and a vacuum of -0.1 MPa. The degassed reactants were then poured into a custom-made polytetrafluoroethylene mold coated with a silicone release agent and placed in a vacuum oven. First, the mixture was dried at 40°C for 6 hours until it was basically cured and formed. Then, the temperature was increased to 120°C and the drying continued for 2 hours. Finally, it was cured at room temperature for 7 days to produce a 15 mm thick damping layer of polyurethane composite material for pipe vibration reduction. Then, 100 g of E44 epoxy resin and 3.8 g of polyamide were mixed evenly and poured into a custom-made mold to obtain a 30 mm thick constraint layer. The constraint layer and the damping layer were bonded together using an epoxy resin adhesive to obtain a high-damping vibration-reducing composite material for pipes.

[0072] Example 8

[0073] A method for preparing a high-damping vibration-reducing composite material for pipelines includes the following steps:

[0074] First, weigh 50g of polyhexamethylene adipate neopentyl glycol ester, 8g of propylene glycol, and 0.15mL of organotin T12. Stir evenly using a high-speed mixer at 500rpm / min. Vacuum dewatering is then carried out at 110℃ and -0.095MPa for 3 hours. When the moisture content is <0.1wt%, vacuum dewatering is stopped, and the mixture is allowed to cool to room temperature, yielding component A. Next, weigh 30g of diphenylmethane diisocyanate and 10g of castor oil. Stir evenly using a high-speed mixer at 500rpm / min. Then, weigh 10g of 80μm flake mica powder and 2g of 40nm graphene and incorporate them into the mixture. Disperse evenly using a high-speed mixer at 400rpm / min, avoiding powder clumping. Once dispersion is complete, component B is obtained. Components A and B were poured into the same four-necked flask and stirred evenly using a high-speed stirrer at 500 rpm / min. After stirring, the mixture was placed in a vacuum oven and degassed for 1.5 hours at room temperature and a vacuum of -0.05 MPa. The degassed reactants were then poured into a custom-made PTFE mold coated with a silicone release agent and placed in the vacuum oven. First, the mixture was dried at 40°C for 6 hours until it was basically cured and formed. Then, the temperature was increased to 100°C and the drying continued for 8 hours. Finally, it was cured at room temperature for 7 days to produce a 13 mm thick damping layer of polyurethane composite material for pipe vibration reduction. Then, 100 g of E51 epoxy resin and 3.8 g of polyamide were mixed evenly and poured into a custom-made mold to obtain a 20 mm thick constraint layer. The constraint layer and the damping layer were bonded together using an epoxy resin adhesive to obtain a high-damping vibration-reducing composite material for pipes.

[0075] Example 9

[0076] A method for preparing a high-damping vibration-reducing composite material for pipelines includes the following steps:

[0077] First, weigh 51g of polyhexamethylene adipate neopentyl glycol ester, 6g of adipate alcohol, and 0.1mL of organotin T12. Stir evenly using a high-speed mixer at 500rpm / min. Vacuum dewatering is carried out at 110℃ and -0.095MPa for 3 hours. When the moisture content is <0.1wt%, vacuum dewatering is stopped, and the mixture is cooled to room temperature to obtain component A. Next, weigh 20g of diphenylmethane diisocyanate and 8g of castor oil. Stir evenly using a high-speed mixer at 500rpm / min. Then, weigh 8g of flaky mica powder with a particle size of 40μm and 1.5g of graphene with a particle size of 20nm and incorporate them into the mixture. Disperse evenly using a high-speed mixer at 350rpm / min, avoiding powder clumping. Once dispersion is complete, component B is obtained. Components A and B were poured into the same four-necked flask and stirred evenly using a high-speed stirrer at 500 rpm / min. After stirring, the mixture was placed in a vacuum oven and degassed for 1 hour at room temperature and a vacuum of -0.02 MPa. The degassed reactants were then poured into a custom-made polytetrafluoroethylene mold coated with an organosilicon release agent and placed in the vacuum oven. First, the mixture was dried at 40°C for 6 hours until it was basically cured and formed. Then, the temperature was increased to 80°C and the drying continued for 12 hours. Finally, it was cured at room temperature for 7 days to produce a 14 mm thick damping layer of polyurethane composite material for pipe vibration reduction. Then, 100 g of bisphenol A epoxy resin and 3.8 g of polyamide were mixed evenly and poured into a custom-made mold to obtain a 15 mm thick constraint layer. The constraint layer and the damping layer were bonded together using an epoxy resin adhesive to obtain a high-damping vibration-reducing composite material for pipes.

[0078] Example 10

[0079] A method for preparing a high-damping vibration-reducing composite material for pipelines includes the following steps:

[0080] First, weigh 51g of polyhexamethylene adipate neopentyl glycol ester, 5g of isophorone diamine, and 0.2mL of organotin T12. Stir evenly using a high-speed mixer at 500rpm / min. Vacuum dewatering is carried out at 110℃ and -0.095MPa for 3 hours. When the moisture content is <0.1wt%, vacuum dewatering is stopped, and the mixture is cooled to room temperature to obtain component A. Next, weigh 15g of diphenylmethane diisocyanate and 7g of castor oil. Stir evenly using a high-speed mixer at 500rpm / min. Then, weigh 7g of 60μm flake mica powder and 2g of 30nm graphene and incorporate them into the mixture. Disperse evenly using a high-speed mixer at 450rpm / min, avoiding powder clumping. Once dispersion is complete, component B is obtained. Components A and B were poured into the same four-necked flask and stirred evenly using a high-speed mixer at 500 rpm / min. After stirring, the mixture was placed in a vacuum oven and degassed for 1 hour at room temperature and a vacuum of -0.01 MPa. The degassed reactants were then poured into a custom-made polytetrafluoroethylene mold coated with a silicone release agent and placed in the vacuum oven. First, the mixture was dried at 40°C for 6 hours until it was basically cured and formed. Then, the temperature was increased to 70°C and the drying continued for 18 hours. Finally, it was cured at room temperature for 7 days to produce a 12 mm thick damping layer of polyurethane composite material for pipe vibration reduction. Then, 100 g of bisphenol A epoxy resin and 3.8 g of polyamide were mixed evenly and poured into a custom-made mold to obtain a 25 mm thick constraint layer. The constraint layer and the damping layer were bonded together using an epoxy resin adhesive to obtain a high-damping vibration-reducing composite material for pipes.

[0081] Comparative Example 1

[0082] In this comparative example, commercially available polyurethane vibration damping material was used for the damping layer.

[0083] Comparative Example 2

[0084] First, weigh 70g of polycarbonate, 3.3g of dimethylolpropionic acid, and 0.2mL of dibutyltin dilaurate. Stir the mixture thoroughly using a high-speed mixer at 500rpm / min to obtain component A. Vacuum-dehydrate component A at 110℃ and -0.095MPa for 3 hours. When the moisture content is <0.1wt%, stop vacuuming and allow to cool to room temperature. Next, weigh 6.15g of toluene diisocyanate and 5.6g of HDI trimer. Stir the mixture thoroughly using a high-speed mixer at 500rpm / min to obtain component B. Pour component A and component B into the same four-necked flask and stir thoroughly using a high-speed mixer at 500rpm / min. After thorough mixing, place the flask in a vacuum oven and degas for 0.5 hours at room temperature and a vacuum of -0.01MPa. The degassed reactants were poured into a polytetrafluoroethylene mold coated with an organosilicon release agent and placed in a vacuum oven. First, they were dried at 40°C for 6 hours until basically cured and formed. Then, the temperature was increased to 90°C and drying continued for 12 hours. Finally, they were cured at room temperature for 7 days to produce a 12mm thick damping layer of polyurethane composite material for pipe vibration reduction. Then, 100g of bisphenol A epoxy resin and 3.8g of polyamide were mixed evenly and poured into a custom mold to obtain a constraint layer. The constraint layer and the damping layer were bonded together with epoxy resin adhesive to obtain a high-damping vibration-reducing composite material for pipes.

[0085] The performance of the high-damping vibration-damping composite materials for pipelines obtained in Examples 1-5 and Comparative Examples 1-2 was tested using the following methods:

[0086] The elongation at break and modulus of elasticity of Examples 1-5 and Comparative Examples 1-2 were tested in accordance with the standard GB / T 1040.3-2006 Damping and Vibration Reduction Composite Materials for Pipelines.

[0087] The composite loss factor of Examples 1-5 and Comparative Examples 1-2 was tested for the damping and vibration reduction composite material for pipelines in accordance with the standard GB / T 16406.

[0088] The damping layer loss factors of Examples 1-5 and Comparative Examples 1-2 were tested using a DMA1 dynamic mechanical thermal analyzer from Mettel-TOLEDO GmbH, Switzerland. The tests were conducted in tensile mode with a heating rate of 2°C / min, an amplitude of 1% strain, and an N2 atmosphere.

[0089] The thermal aging tests of Examples 1-5 and Comparative Examples 1-2 were conducted on the damping and vibration reduction composite materials for pipelines in accordance with the standard GB / T7141-2008; thermal aging conditions: 100% humidity, 120℃, 2 atm, 48h.

[0090] The damp heat resistance tests of Examples 1-5 and Comparative Examples 1-2 were conducted on the damp heat-resistant composite materials for pipelines in accordance with the standard GB / T 1740.

[0091] Specifically, the experimental data after performance testing of the pump vibration damping materials of Examples 1-5 and Comparative Examples 1-2 are shown in the table below.

[0092] Table 1. Performance comparison of the high-damping vibration-damping composite materials for pipelines prepared in Examples 1-5 and the vibration-damping materials for pumps prepared in Comparative Examples 1-2.

[0093]

[0094] Table 1 compares the performance of the high-damping vibration-damping composite materials for pipelines prepared in Examples 1-5 of this invention with the vibration-damping materials for pumps prepared in Comparative Examples 1-2. As can be seen from the above experiments, the damping materials in the embodiments of this invention are composed of a polyurethane system, with mica and graphene added as fillers, and are composited with an epoxy resin constraint layer. This structural design helps improve the mechanical properties and vibration-damping effect of the material. The comparative examples are composed only of polyurethane without any fillers, resulting in significant deficiencies in mechanical properties and damping performance. The innovation of Examples 1-5 of this invention lies in adding mica and graphene as fillers to the polyurethane-based damping layer. By adding mica and graphene, the embodiments not only endow the material with better damping characteristics but also increase the material's loss factor, enabling it to absorb and attenuate vibrations more effectively. This demonstrates superior vibration-damping effects in pipeline systems, especially under complex vibration and impact environments. Simultaneously, the sheet-like structure of mica has excellent mechanical reinforcing properties, increasing the material's strength and impact resistance. Furthermore, graphene, as a high-strength filler with good thermal conductivity, further enhances the material's wear resistance and heat resistance. These fillers not only improve the chemical stability of the damping layer but also enhance its performance under high temperature and complex stress environments. Combined with epoxy resin to form a constraint layer, they significantly improve the material's damping performance, mechanical properties, thermal conductivity, and durability, addressing the performance deficiencies of the materials in Comparative Examples 1-2. Particularly in long-term use and complex environments, the patented embodiments demonstrate significant advantages. These characteristics make the patented embodiments superior to the comparative examples in vibration reduction, meeting the practical application requirements for high-performance vibration damping materials for pipelines.

[0095] This invention discloses a high-damping vibration-reducing composite material for pipelines and its preparation method. The composite material consists of a damping layer and a restraining layer. The damping layer is a multi-component polyurethane system cured in one step, with flake mica and graphene added as fillers to enhance damping performance. The composition includes 45-70 parts polyester polyol, 3-9 parts small molecule chain extender, 0.1-0.3 parts organotin catalyst, 10-27 parts isocyanate, 5-30 parts curing agent, 5-12 parts flake mica powder, and 1-3 parts graphene. All components are thoroughly stirred under vacuum to remove air bubbles, and then poured into a polytetrafluoroethylene mold coated with an organosilicon release agent. The mixture is dried in a vacuum oven and allowed to mature for 7 days. The restraining layer is a mixture of epoxy resin and curing agent in a specific ratio, coated onto the surface of the damping layer to form a through-wall, used to improve the overall structural stability of the composite material during pipeline use. The high-damping vibration reduction composite material prepared by this invention addresses the major national strategic needs and practical application requirements. It possesses excellent vibration reduction performance, high strength, chemical stability, and other superior properties, and can be used as a vibration reduction composite material in the field of vibration reduction and noise reduction of pipelines and other equipment in special scenarios.

[0096] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A method for producing a high-damping vibration-reducing composite material for pipes, characterized by, The method comprises the following steps: The polyol, the chain extender, the metal catalyst, the isocyanate, the cross-linking curing agent, the mica powder and the graphene are mixed and stirred uniformly, degassed, poured into a mold, dried, cured and formed, and then aged to obtain a damping layer; Then, the epoxy resin and the curing agent are mixed uniformly, poured into a mold to obtain a constraint layer; finally, the constraint layer is bonded to the surface of the damping layer by an epoxy resin adhesive to obtain a high-damping vibration reduction composite material for pipelines. The mass ratio of the polyol, the chain extender, the metal catalyst, the isocyanate, the cross-linking curing agent, the mica powder and the graphene is (40-75):(4-10):(0.05-0.2):(15-45):(5-15):(5-12):(1-3).

2. The method of claim 1, wherein the high damping vibration reduction composite material for a pipe is prepared by the steps of: The thickness of the damping layer is 10-15 mm, the thickness of the constraint layer is 12-30 mm, and the thickness ratio of the constraint layer to the damping layer is (1.2-2):

1.

3. The method of claim 1, wherein the high damping vibration reduction composite material for a pipe is prepared by the steps of: The polyol is at least one of polytetrahydrofuran diol, polyoxypropylene glycol, polycarbonate and polyhexanediol neopentaglycol adipate; the relative molecular mass of the polytetrahydrofuran diol is 1000 g / mol, the relative molecular mass of the polyoxypropylene glycol is 1000 g / mol, and the relative molecular mass of the polyhexanediol neopentaglycol adipate is 2000 g / mol; The chain extender comprises a hydroxyl chain extender and an amine chain extender; the hydroxyl chain extender is at least one of 1,4-butanediol, ethylene glycol, propylene glycol, trimethylolpropane, neopentyl glycol and dimethylolpropionic acid, and the amine chain extender is at least one of ethylenediamine sodium ethyl sulfonate and isophorone diamine; The metal catalyst is any one of stannous octoate, dibutyltin dilaurate and triphenyltin; The isocyanate is at least one of toluene diisocyanate, dicyclohexylmethane diisocyanate, diphenylmethane diisocyanate, lysine diisocyanate and isophorone diisocyanate; The cross-linking curing agent is at least one of hydroxyethyl ethylenediamine, trimethylolpropane, castor oil and pentaerythritol.

4. The method of claim 1, wherein the high damping vibration reduction composite material for a pipe is prepared by the steps of: The particle size of the mica powder is 1-100 μm, the particle size of the graphene is 1-50 nm, and the mica powder and the graphene are added in the order of adding the mica powder first and then adding the graphene, and are fully stirred after each addition, at a stirring rate of 300-500 rpm.

5. The method of claim 1, wherein the high damping vibration reduction composite material for a pipe is prepared by the steps of: The epoxy resin is at least one of E20, E44 and E51, and the curing agent is a polyamine or an amine derivative.

6. The method of claim 1, wherein the high damping vibration reduction composite material for a pipe is prepared by the steps of: The curing temperature is 60-120 ℃, and the curing time is 2-24 h.

7. The method for preparing the high-damping vibration-reducing composite material for pipelines according to claim 1, characterized in that, The vacuum degree of the degassing is -0.01 to -0.1 MPa, and the degassing time is 1-2 h.

8. The method of claim 1, wherein the high damping vibration reduction composite material for a pipe is prepared by the steps of: The damping layer and the constraint layer are bonded by hot pressing during the bonding process.

9. The high damping vibration isolation composite material for pipes prepared by the method according to any one of claims 1 to 8, characterized in that, The damping layer and the constraint layer are bonded by hot pressing during the bonding process.

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