High-damping vibration attenuation composite material for pipeline and preparation method of high-damping vibration attenuation composite material

Abstract

The invention discloses a high-damping vibration attenuation composite material for a pipeline and a preparation method of the high-damping vibration attenuation composite material, and belongs to the technical field of pipeline vibration attenuation material preparation, the high-damping vibration attenuation composite material is composed of a damping layer and a restraint layer, the damping layer is formed by curing a multi-component polyurethane system through a one-step method, and flake mica and graphene serve as filler for enhancing the damping performance; the preparation method comprises the following steps: fully and uniformly stirring polyester polyol, a micromolecule chain extender, an organic tin catalyst, isocyanate, a curing agent, flaky mica powder and graphene in a vacuum environment, removing bubbles, pouring into a mold sprayed with an organic silicon release agent, drying and molding, and standing and curing after molding. The restraint layer is prepared by mixing epoxy resin and a curing agent in proportion and coating the surface of the damping layer with the mixture, and is used for improving the overall structural stability of the composite material in the pipeline using process. The high-damping vibration attenuation composite material for the pipeline has excellent vibration attenuation performance, high strength and excellent chemical stability, and can be applied to vibration attenuation and noise reduction of equipment such as the pipeline in special scenes.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline vibration-damping material preparation, and in particular relates to a high-damping vibration-damping composite material for pipelines and a preparation method thereof. Background Art

[0002] With the rapid development of modern industry, pipeline systems are widely used in the fields of petroleum, chemical industry, natural gas, water supply, heating, etc. These pipelines will inevitably be affected by external factors such as mechanical vibration, ambient temperature changes and fluid impact during operation, resulting in noise, stress concentration and fatigue damage. Long-term vibration will not only reduce the service life of the pipeline, but also affect the normal operation of surrounding equipment and even cause safety accidents. Therefore, how to effectively reduce pipeline vibration and improve the vibration reduction effect of the system has become an important topic 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, performance attenuation and other problems during high-frequency vibration and long-term use. In addition, ordinary vibration reduction materials often have a contradiction between mechanical properties and damping properties, which is difficult to take into account, and it is difficult to meet the vibration reduction needs in complex environments. Therefore, it is particularly important to develop a vibration reduction material with high damping performance, good mechanical strength and durability.

[0003] Polyurethane materials have been widely used in the field of vibration and noise reduction due to their excellent mechanical properties, wear resistance, aging resistance and processing adaptability. However, single polyurethane materials have limited performance in high damping performance and are difficult to meet the vibration reduction requirements under long-term and complex working conditions. In order to further improve the vibration reduction effect of polyurethane materials, researchers began to add various fillers such as mica, calcium carbonate, silicate, etc. 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 the vibration reduction effect is not significant.

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

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

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: The invention discloses a method for preparing a high-damping vibration-reducing composite material for a pipeline, comprising the following steps: The polyol, chain extender, metal catalyst, isocyanate, cross-linking curing agent, mica powder and graphene are mixed and stirred evenly, poured into a mold after degassing, dried, cured and shaped, and matured to obtain a damping layer; then, the epoxy resin and the curing agent are mixed evenly, poured into the 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-reducing composite material for pipelines.

[0007] Preferably, the mass ratio of polyol, chain extender, metal catalyst, isocyanate, cross-linking curing agent, mica powder and graphene is (40-75): (4-10): (0.05-0.2): (15-45): (5-15): (5-12): (1-3).

[0008] Preferably, the thickness of the damping layer is 10-15 mm, the thickness of the constraining layer is 12-30 mm, and the thickness ratio of the constraining layer to the damping layer is (1.2-2):1.

[0009] Preferably, the polyol is at least one of polytetrahydrofuran diol, polyoxypropylene diol, polycarbonate and poly(hexanediol adipate neopentyl glycol); wherein the relative molecular mass of polytetrahydrofuran diol is 1000 g / mol, the relative molecular mass of polyoxypropylene polyol is 1000 g / mol, and the relative molecular mass of poly(hexanediol adipate neopentyl glycol) is 2000 g / mol; The chain extender includes a hydroxy chain extender and an amine chain extender; the hydroxy chain extender is at least one of 1,4-butanediol, ethylene glycol, propylene glycol, trimethylolpropane, neopentyl glycol, adipic acid alcohol and dimethylolpropionic acid; the amine chain extender is at least one of sodium ethylenediamine sulfonate and isophorone diamine; The metal catalyst is any one of stannous octoate, dibutyltin dilaurate, organotin T12 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 hydroxyethylethylenediamine, trimethylolpropane, castor oil and pentaerythritol.

[0010] Preferably, the particle size of the mica powder is 1-100 μm; the particle size of the graphene is 1-50 nm; the order of adding the mica powder and the graphene is to add the mica powder first and then the graphene, and stir thoroughly after each addition at a stirring rate of 300-500 rpm / min.

[0011] Preferably, the epoxy resin is at least one of E20, E44 and E51; and the curing agent is polyamine or an amine derivative.

[0012] Preferably, the curing temperature is 60-120° C., and the curing time is 2-24 h.

[0013] Preferably, the vacuum degree of degassing is -0.01 to -0.1 MPa, and the degassing time is 1 to 2 hours.

[0014] Preferably, the damping layer and the constraining layer are bonded by hot pressing during the bonding process.

[0015] The invention discloses a high damping vibration reduction composite material for pipelines prepared by the preparation method, comprising a damping layer and a constraint layer coated on the surface of the damping layer; fillers are added to the damping layer, and the fillers include flaky mica and graphene.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The invention discloses a preparation method of a high damping vibration reduction composite material for pipelines. The composite structure design of the damping layer and the constraint layer, especially the introduction of mica and graphene fillers in the damping layer, makes the material have higher damping performance. Mica as a layered filler can effectively improve the internal friction of the material, while graphene has excellent thermal conductivity and mechanical strength. The two work together to significantly enhance the vibration reduction effect of the material, which is particularly suitable for vibration and noise suppression in pipelines. Durability is enhanced. At the same time, by using epoxy resin as a constraint layer, the structural strength and weather resistance of the material are improved, and it can better resist aging and corrosion in harsh environments. In addition, epoxy resin also has high adhesion and mechanical strength, and forms a good composite effect with the damping layer of the polyurethane system, extending the service life of the material. Compared with traditional vibration reduction materials, the high damping vibration reduction composite material for pipelines prepared by the invention maintains high-efficiency vibration reduction capability while utilizing the light weight and flexibility of the polyurethane system, so that the material can better fit the pipeline structure in application, does not increase the load of the pipeline, and is particularly suitable for large-scale industrial pipeline systems. The present invention can flexibly adjust the damping characteristics of the damping layer by adjusting the amount of mica and graphene added, thereby achieving customized vibration reduction requirements under different working conditions. This allows the material to be widely used in pipes of different types and sizes, with a wider range of adaptability. The present invention is not only significantly superior to the existing technology in terms of vibration reduction performance, light weight, durability and customized design, but also has a simple preparation process and low production cost, which solves many defects in the existing technology and meets the urgent needs of modern pipeline systems for high-performance vibration reduction materials.

[0017] The present invention also discloses a high damping vibration reduction composite material for pipelines prepared by the above preparation method, comprising a damping layer and a constraint layer coated on the surface of the damping layer; a filler is added to the damping layer, and the filler includes flaky mica and graphene; the damping layer is a multi-component polyurethane system that is cured and formed in one step, and the flaky mica and graphene are used as fillers to enhance the damping performance, and the constraint layer is coated on the surface of the damping layer to improve the overall structural stability of the composite material during the use of the pipeline. The high damping vibration reduction composite material for pipelines prepared by the present invention has excellent vibration reduction performance, high strength, and excellent chemical stability, and can be used for vibration reduction and noise reduction of pipelines and other equipment in special scenarios. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0019] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0020] The present invention is described in further detail below in conjunction with embodiments: As a new type of two-dimensional material, graphene is gradually being used 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 greatly improve the mechanical properties of the material, but also enhance the damping performance and durability of the composite material. In addition, the nanosheet structure of graphene can effectively improve the gas barrier performance of the material, thereby improving the protective performance and service life of the material. Mica, as a layered silicate mineral, has 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, so that the material has better stability in complex environments. At the same time, the present invention uses epoxy resin as the constraint layer of the composite material. Epoxy resin has excellent mechanical properties, chemical corrosion resistance and good adhesion, and can maintain its structural stability under various harsh working conditions. At the same time, the low shrinkage rate and excellent curing performance of epoxy resin enable it to provide precise size control during the molding process and form a good composite effect with the polyurethane damping layer. In addition, epoxy resin exhibits a certain damping effect under a vibration environment, which can assist in improving the vibration reduction performance of the overall material. Based on this, the present invention introduces graphene and mica as fillers in the polyurethane damping layer and combines epoxy resin as a constraint layer to prepare a high damping vibration reduction material for pipelines. The material not only has excellent vibration reduction performance, but also can maintain good mechanical strength and chemical stability in a high-intensity vibration environment. It is particularly suitable for industrial pipeline systems that run for a long time, significantly extending the service life of the pipeline and improving the safety of operation.

[0021] The present 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 curing a multi-component polyurethane system in one step. Flake mica and graphene are added as fillers to enhance the damping performance. Each component consists of the following raw materials: The damping layer includes 40-75 parts of polyol, 4-10 parts of hydroxyl and amine chain extenders, 0.05-0.2 parts of metal catalysts, 15-45 parts of isocyanates, 5-15 parts of cross-linking curing agents, 5-12 parts of flaky mica powder and 1-3 parts of graphene. The components are placed in a four-necked flask and stirred evenly, and degassed under vacuum to remove bubbles, and then poured into a polytetrafluoroethylene mold sprayed with a polyurethane release agent, placed in a blast oven for drying, cured and formed, and left to stand for a period of time at room temperature to mature to obtain a damping layer.

[0022] The constraining layer is made by mixing epoxy resin and curing agent in a ratio of 10:1 and coating it on the surface of the damping layer. It is used to improve the overall structural stability of the composite material during the use of the pipeline.

[0023] The constraining 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.

[0024] Preferably, the high damping vibration reduction composite material for pipelines consists of a damping layer and a constrained layer, the thickness of the damping layer is 10-15 mm, the thickness of the constrained layer is 12-30 mm, and the thickness ratio of the constrained layer to the damping layer is (1.2-2):1.

[0025] Preferably, polyol is one or more components in polytetrahydrofuran diol, polyoxypropylene glycol and polyhexylene adipate neopentyl glycol ester. Wherein the relative molecular mass of polytetrahydrofuran diol is 1000g / mol, the relative molecular mass of polyoxypropylene polyol is 1000g / mol, and the relative molecular mass of polyhexylene adipate neopentyl glycol ester is 2000g / mol.

[0026] Preferably, the hydroxy chain extender is a combination of one or more of 1,4-butanediol, ethylene glycol, propylene glycol, trimethylolpropane, neopentyl glycol, adipic acid alcohol and dimethylolpropionic acid, and the amine chain extender is a combination of one or two of sodium ethylenediamine sulfonate and isophoronediamine.

[0027] Preferably, the metal catalyst is one of stannous octoate, dibutyltin dilaurate, organotin T12 and triphenyltin, preferably stannous octoate.

[0028] Preferably, the isocyanate is one or more components selected from the group consisting of toluene diisocyanate, 4,4-diphenylmethane diisocyanate, hexamethylene diisocyanate, dicyclohexylmethane diisocyanate and isophorone diisocyanate.

[0029] Preferably, the cross-linking curing agent is one or more components selected from the group consisting of hydroxyethylethylenediamine, trimethylolpropane, castor oil and pentaerythritol.

[0030] Preferably, the particle size of mica is 1-100 μm.

[0031] Preferably, the particle size of graphene is 1-50 nm.

[0032] Preferably, the order of adding mica and graphene is to add mica first and then graphene, and stir thoroughly after each addition.

[0033] Preferably, the stirring speed is 300-500 rpm / min.

[0034] Preferably, the epoxy resin is one or more of E20, E44, E51.

[0035] Preferably, the curing agent for the epoxy resin is an amine curing agent.

[0036] Preferably, the amine curing agent is a polyamine or an amine derivative.

[0037] Preferably, the curing temperature is 60-120° C. and the curing time is 2-24 hours.

[0038] Preferably, the vacuum degree during degassing is -0.01 to -0.1 MPa, and the degassing time is 1 to 2 hours.

[0039] Preferably, the damping layer and the constraining layer are formed by hot pressing during the curing process to improve the composite strength of the material.

[0040] Preferably, final processing of the material may include cutting, grinding and surface treatment steps to meet specific size and shape requirements for different pipe applications.

[0041] The composite material prepared by the above-mentioned preparation method of high damping vibration-reducing polyurethane is used as a vibration-reducing material for special pipelines in nuclear power plants and the like.

[0042] Example 1 A method for preparing a high-damping vibration-reducing composite material for a pipeline comprises the following steps: First, weigh 48g of polyoxypropylene polyol, 4.58g of neopentyl glycol and 0.2mL of dibutyltin dilaurate, and stir them evenly at a speed of 500rpm / min using a high-speed stirrer. Vacuum water for 3h at 110℃ and -0.095MPa. When the moisture content is <0.1wt%, stop vacuuming and cool to room temperature to obtain component A. Continue to weigh 18g of lysine diisocyanate and 8.75g of hydroxyethylethylenediamine, stir them evenly at a speed of 500rpm / min using a high-speed stirrer, then weigh 6.0g of flaky mica powder with a particle size of 80μm and 2g of graphene with a particle size of 40 nm, and disperse them evenly at a speed of 450rpm / min using a high-speed stirrer to avoid powder agglomeration. After dispersion, component B is obtained. Pour component A and component B into the same four-necked flask, stir evenly at a speed of 500rpm / min using a high-speed stirrer, place in a vacuum oven after stirring evenly, and degas for 1.5h at room temperature and vacuum degree -0.01MPa. Pour the degassed reactant into a custom polytetrafluoroethylene mold sprayed with a silicone release agent and place it in a vacuum oven. First, dry at 40℃ for 6h. After the curing is basically formed, raise the temperature to 90℃ and continue drying for 12h. Finally, mature at room temperature for 7d to make a damping layer of a vibration-damping polyurethane composite material for pipelines with a thickness of 12mm. Then mix 100g of bisphenol A epoxy resin and 3.8g of polyamide evenly and pour them into the customized mold to obtain a constraint layer with a thickness of 15mm. The constraint layer and the damping layer are bonded with an epoxy resin adhesive to obtain a high-damping vibration-damping composite material for pipelines.

[0043] Example 2 A method for preparing a high-damping vibration-reducing composite material for a pipeline comprises the following steps: First, weigh 51g of polyhexanediol adipate, 5.04g of trimethylolpropane and 0.2mL of organotin T12, and stir them evenly at a speed of 500rpm / min using a high-speed stirrer. Vacuum water for 3h at 110℃ and -0.095MPa. When the moisture content is <0.1wt%, stop vacuuming and cool to room temperature to obtain component A. Continue to weigh 30.47g of diphenylmethane diisocyanate and 8.82g of castor oil, stir them evenly at a speed of 500rpm / min using a high-speed stirrer, 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 disperse them evenly at a speed of 400rpm / min using a high-speed stirrer to avoid powder agglomeration. After dispersion, component B is obtained. Pour component A and component B into the same four-necked flask, stir evenly at a speed of 500rpm / min using a high-speed stirrer, and place in a vacuum oven after stirring evenly, and degas for 1.5h at room temperature and vacuum degree -0.01MPa. Pour the degassed reactant into a custom polytetrafluoroethylene mold sprayed with a silicone release agent and place it in a vacuum oven. First, dry it at 40℃ for 6h. After the solidification is basically formed, the temperature is raised to 90℃ and the drying is continued for 12h. Finally, mature it at room temperature for 7d to make a damping layer of a vibration-damping polyurethane composite material for pipelines with a thickness of 12mm. Then, 100g of bisphenol A epoxy resin and 3.8g of polyamide are mixed evenly and poured into the customized mold to obtain a constraint layer with a thickness of 15mm. The constraint layer and the damping layer are bonded with an epoxy resin adhesive to obtain a high-damping vibration-damping composite material for pipelines.

[0044] Example 3 A method for preparing a high-damping vibration-reducing composite material for a pipeline comprises the following steps: First, weigh 40g of polyoxypropylene glycol, 7.36g of neopentyl glycol and 0.2mL of dibutyltin dilaurate, and stir them evenly at a speed of 500rpm / min using a high-speed stirrer. Vacuum water for 3h at 110℃ and -0.095MPa. When the moisture content is <0.1wt%, stop vacuuming and cool to room temperature to obtain component A. Continue to weigh 22.65g of cyclohexylmethane diisocyanate and 7.85g of pentaerythritol, stir them evenly at a speed of 500rpm / min using a high-speed stirrer, then weigh 6.4g of flaky mica powder and 2.0g of graphene, mix them in, and disperse them evenly at a speed of 500rpm / min using a high-speed stirrer to avoid powder agglomeration. After dispersion, component B is obtained. Pour component A and component B into the same four-necked flask, stir evenly at a speed of 500rpm / min using a high-speed stirrer, place in a vacuum oven after stirring evenly, and degas for 1.0h at room temperature and vacuum degree -0.01MPa. Pour the degassed reactants into a custom polytetrafluoroethylene mold sprayed with a silicone release agent and place in a vacuum oven. First, dry at 40℃ for 6h. After the curing is basically formed, raise the temperature to 90℃ and continue drying for 12h. Finally, mature at room temperature for 7d to make a damping layer of a vibration-damping polyurethane composite material for pipelines with a thickness of 12mm. Then, 100g of bisphenol A epoxy resin and 3.8g of polyamide are mixed evenly and poured into the customized mold to obtain a constraint layer with a thickness of 13.5mm. The constraint layer and the damping layer are bonded with an epoxy resin adhesive to obtain a high-damping vibration-damping composite material for pipelines.

[0045] Example 4 A method for preparing a high-damping vibration-reducing composite material for a pipeline comprises the following steps: First, weigh 60g of polytetrahydrofuran diol, 7.8g of sodium ethylenediamine sulfonate and 0.2mL of triphenyltin, and stir them evenly at a speed of 500rpm / min using a high-speed stirrer. Vacuum water for 3h at 110℃ and -0.095MPa. When the moisture content is <0.1wt%, stop vacuuming and cool to room temperature to obtain component A. Continue to weigh 22.16g of isophorone diisocyanate and 5.52g of trimethylolpropane, stir them evenly at a speed of 500rpm / min using a high-speed stirrer, 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 disperse them evenly at a speed of 450rpm / min using a high-speed stirrer to avoid powder agglomeration. After dispersion, component B is obtained. Pour component A and component B into the same four-necked flask, stir evenly at a speed of 500rpm / min using a high-speed stirrer, and place in a vacuum oven after stirring evenly, and degas for 1.5h at room temperature and vacuum degree -0.01MPa. Pour the degassed reactant into a custom polytetrafluoroethylene mold sprayed with a silicone release agent and place it in a vacuum oven. First, dry it at 40℃ for 6h. After the curing is basically formed, raise the temperature to 90℃ and continue drying for 12h. Finally, mature it at room temperature for 7d to make a vibration-damping polyurethane composite damping layer for pipelines with a thickness of 12mm. Then, 100g of bisphenol A epoxy resin and 3.8g of polyamide are mixed evenly and poured into the customized mold to obtain a constraint layer with a thickness of 19.6mm. The constraint layer and the damping layer are bonded with an epoxy resin adhesive to obtain a high-damping vibration-damping composite material for pipelines.

[0046] Example 5 A method for preparing a high-damping vibration-reducing composite material for a pipeline comprises the following steps: First, weigh 70g of polycarbonate, 8.31g of dimethylolpropionic acid and 0.2mL of stannous octoate, and stir them evenly at a speed of 500rpm / min using a high-speed stirrer. Vacuum water for 3h at 110℃ and -0.095MPa. When the moisture content is <0.1wt%, stop vacuuming and cool to room temperature to obtain component A. Continue to weigh 30.15g of toluene diisocyanate and 8.51g of trimethylolpropane, stir them evenly at a speed of 500rpm / min using a high-speed stirrer, then weigh 8g of flaky mica powder with a particle size of 74μm and 2.3g of graphene with a particle size of 20nm, and disperse them evenly at a speed of 500rpm / min using a high-speed stirrer to avoid powder agglomeration. After dispersion, component B is obtained. Pour component A and component B into the same four-necked flask, stir evenly at a speed of 500rpm / min using a high-speed stirrer, and place in a vacuum oven after stirring evenly, and degas for 2h at room temperature and vacuum degree -0.01MPa. Pour the degassed reactant into a custom polytetrafluoroethylene mold sprayed with a silicone release agent and place it in a vacuum oven. First, dry it at 40℃ for 6h. After the curing is basically formed, raise the temperature to 90℃ and continue drying for 12h. Finally, mature it at room temperature for 7d to make a damping layer of a vibration-damping polyurethane composite material for pipelines with a thickness of 12mm. Then, 100g of bisphenol A epoxy resin and 3.8g of polyamide are mixed evenly and poured into the customized mold to obtain a constraint layer with a thickness of 12mm. The constraint layer and the damping layer are bonded with an epoxy resin adhesive to obtain a high-damping vibration-damping composite material for pipelines.

[0047] Example 6 A method for preparing a high-damping vibration-reducing composite material for a pipeline comprises the following steps: First, weigh 40g of poly(hexanediol adipate neopentyl glycol), 4g of 1,4-butanediol and 0.05mL of organotin T12, and stir them evenly at a speed of 500rpm / min using a high-speed stirrer. Vacuum water for 3h at 110℃ and -0.095MPa. When the moisture content is <0.1wt%, stop vacuuming and cool to room temperature to obtain component A. Continue to weigh 15g of dicyclohexylmethane diisocyanate and 5g of castor oil, stir them evenly at a speed of 500rpm / min using a high-speed stirrer, then weigh 5g of flaky mica powder with a particle size of 1μm and 1g of graphene with a particle size of 1nm, and disperse them evenly at a speed of 300rpm / min using a high-speed stirrer to avoid powder agglomeration. After dispersion, component B is obtained. Pour component A and component B into the same four-necked flask, stir evenly at a speed of 500rpm / min using a high-speed stirrer, and place in a vacuum oven after stirring evenly, and degas for 1h at room temperature and vacuum degree -0.01MPa. Pour the degassed reactants into a custom polytetrafluoroethylene mold sprayed with a silicone release agent and place it in a vacuum oven. First, dry at 40℃ for 6h. After the curing is basically formed, the temperature is raised to 60℃ and continued to dry for 24h. Finally, mature at room temperature for 7d to make a vibration-damping polyurethane composite damping layer for pipelines with a thickness of 12mm. Then, 100g E20 epoxy resin and 3.8g polyamide are mixed evenly and poured into the customized mold to obtain a constraint layer with a thickness of 12mm. The constraint layer and the damping layer are bonded with an epoxy resin adhesive to obtain a high-damping vibration-damping composite material for pipelines.

[0048] Example 7 A method for preparing a high-damping vibration-reducing composite material for a pipeline comprises the following steps: First, weigh 75g of poly(hexanediol adipate neopentyl glycol), 10g of ethylene glycol and 0.2mL of organotin T12, and stir them evenly at a speed of 500rpm / min using a high-speed stirrer. Vacuum water for 3h at 110℃ and -0.095MPa. When the moisture content is <0.1wt%, stop vacuuming and cool to room temperature to obtain component A. Continue to weigh 45g of diphenylmethane diisocyanate and 15g of castor oil, stir them evenly at a speed of 500rpm / min using a high-speed stirrer, then weigh 12g of flaky mica powder with a particle size of 100μm and 3g of graphene with a particle size of 50nm, and disperse them evenly at a speed of 500rpm / min using a high-speed stirrer to avoid powder agglomeration. After dispersion, component B is obtained. Pour component A and component B into the same four-necked flask, stir evenly at a speed of 500rpm / min using a high-speed stirrer, and place in a vacuum oven after stirring evenly, and degas for 2h at room temperature and vacuum degree -0.1MPa. Pour the degassed reactants into a custom polytetrafluoroethylene mold sprayed with a silicone release agent and place it in a vacuum oven. First, dry at 40℃ for 6h. After the curing is basically formed, raise the temperature to 120℃ and continue drying for 2h. Finally, mature at room temperature for 7d to make a damping layer of a vibration-damping polyurethane composite material for pipelines with a thickness of 15mm. Then, 100g E44 epoxy resin and 3.8g polyamide are mixed evenly and poured into the customized mold to obtain a constraint layer with a thickness of 30mm. The constraint layer and the damping layer are bonded with an epoxy resin adhesive to obtain a high-damping vibration-damping composite material for pipelines.

[0049] Example 8 A method for preparing a high-damping vibration-reducing composite material for a pipeline comprises the following steps: First, weigh 50g of poly(hexanediol adipate neopentyl glycol), 8g of propylene glycol and 0.15mL of organotin T12, and stir them evenly at a speed of 500rpm / min using a high-speed stirrer. Vacuum water for 3h at 110℃ and -0.095MPa. When the moisture content is <0.1wt%, stop vacuuming and cool to room temperature to obtain component A. Continue to weigh 30g of diphenylmethane diisocyanate and 10g of castor oil, stir them evenly at a speed of 500rpm / min using a high-speed stirrer, then weigh 10g of flaky mica powder with a particle size of 80μm and 2g of graphene with a particle size of 40nm, and disperse them evenly at a speed of 400rpm / min using a high-speed stirrer to avoid powder agglomeration. After dispersion, component B is obtained. Pour component A and component B into the same four-necked flask, stir evenly at a speed of 500rpm / min using a high-speed stirrer, and place in a vacuum oven after stirring evenly, and degas for 1.5h at room temperature and vacuum degree -0.05MPa. Pour the degassed reactants into a custom polytetrafluoroethylene mold sprayed with a silicone release agent and place it in a vacuum oven. First, dry at 40℃ for 6h. After the curing is basically formed, the temperature is raised to 100℃ and the drying is continued for 8h. Finally, mature at room temperature for 7d to make a damping layer of a vibration-damping polyurethane composite material for pipelines with a thickness of 13mm. Then, 100g E51 epoxy resin and 3.8g polyamide are mixed evenly and poured into the customized mold to obtain a constraint layer with a thickness of 20mm. The constraint layer and the damping layer are bonded with an epoxy resin adhesive to obtain a high-damping vibration-damping composite material for pipelines.

[0050] Example 9 A method for preparing a high-damping vibration-reducing composite material for a pipeline comprises the following steps: First, weigh 51g of polyhexanediol adipate, 6g of adipate alcohol and 0.1mL of organotin T12, and stir them evenly at a speed of 500rpm / min using a high-speed stirrer. Vacuum water for 3h at 110℃ and -0.095MPa. When the moisture content is <0.1wt%, stop vacuuming and cool to room temperature to obtain component A. Continue to weigh 20g of diphenylmethane diisocyanate and 8g of castor oil, stir them evenly at a speed of 500rpm / min using a high-speed stirrer, 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 disperse them evenly at a speed of 350rpm / min using a high-speed stirrer to avoid powder agglomeration. After dispersion, component B is obtained. Pour component A and component B into the same four-necked flask, stir evenly at a speed of 500rpm / min using a high-speed stirrer, and place in a vacuum oven after stirring evenly, and degas for 1h at room temperature and vacuum degree -0.02MPa. Pour the degassed reactant into a custom polytetrafluoroethylene mold sprayed with a silicone release agent and place it in a vacuum oven. First, dry it at 40℃ for 6h. After the curing is basically formed, the temperature is raised to 80℃ and the drying is continued for 12h. Finally, mature it at room temperature for 7d to make a damping layer of a vibration-damping polyurethane composite material for pipelines with a thickness of 14mm. Then, 100g of bisphenol A epoxy resin and 3.8g of polyamide are mixed evenly and poured into the customized mold to obtain a constraint layer with a thickness of 15mm. The constraint layer and the damping layer are bonded with an epoxy resin adhesive to obtain a high-damping vibration-damping composite material for pipelines.

[0051] Example 10 A method for preparing a high-damping vibration-reducing composite material for a pipeline comprises the following steps: First, weigh 51g of poly(hexanediol adipate neopentyl glycol), 5g of isophorone diamine and 0.2mL of organotin T12, and stir them evenly at a speed of 500rpm / min using a high-speed stirrer. Vacuum water for 3h at 110℃ and -0.095MPa. When the moisture content is <0.1wt%, stop vacuuming and cool to room temperature to obtain component A. Continue to weigh 15g of diphenylmethane diisocyanate and 7g of castor oil, stir them evenly at a speed of 500rpm / min using a high-speed stirrer, then weigh 7g of flaky mica powder with a particle size of 60μm and 2g of graphene with a particle size of 30nm, and disperse them evenly at a speed of 450rpm / min using a high-speed stirrer to avoid powder agglomeration. After dispersion, component B is obtained. Pour component A and component B into the same four-necked flask, stir evenly at a speed of 500rpm / min using a high-speed stirrer, place in a vacuum oven after stirring evenly, and degas for 1h at room temperature and vacuum degree -0.01MPa. Pour the degassed reactants into a custom polytetrafluoroethylene mold sprayed with a silicone release agent and place in a vacuum oven. First, dry at 40℃ for 6h. After the curing is basically formed, raise the temperature to 70℃ and continue drying for 18h. Finally, mature at room temperature for 7d to make a damping layer of a vibration-damping polyurethane composite material for pipelines with a thickness of 12mm. Then mix 100g of bisphenol A epoxy resin and 3.8g of polyamide evenly and pour them into the customized mold to obtain a constraint layer with a thickness of 25mm. The constraint layer and the damping layer are bonded with an epoxy resin adhesive to obtain a high-damping vibration-damping composite material for pipelines.

[0052] Comparative Example 1 In this comparative example, the damping layer uses commercial polyurethane vibration reduction material for comparison.

[0053] Comparative Example 2 First, weigh 70g of polycarbonate, 3.3g of dimethylolpropionic acid and 0.2mL of dibutyltin dilaurate, and stir them evenly at a speed of 500rpm / min with a high-speed stirrer to obtain component A. Vacuum water component A for 3h at 110℃ and -0.095MPa. When the moisture content is <0.1wt%, stop vacuuming and cool to room temperature. Continue to weigh 6.15g of toluene diisocyanate and 5.6g of HDI trimer, and stir them evenly at a speed of 500rpm / min with a high-speed stirrer to obtain component B. Pour component A and component B into the same four-necked flask, stir them evenly at a speed of 500rpm / min with a high-speed stirrer, and place them in a vacuum oven after stirring evenly, and degas for 0.5h at room temperature and vacuum degree of -0.01MPa. The degassed reactants were poured into a polytetrafluoroethylene mold sprayed with a silicone release agent, placed in a vacuum oven, and first dried at 40°C for 6 hours. After the solidification was basically formed, the temperature was raised to 90°C and continued to be dried for 12 hours. Finally, it was aged at room temperature for 7 days to make a 12mm thick damping polyurethane composite damping layer for pipelines. Then 100g of bisphenol A epoxy resin and 3.8g of polyamide were mixed evenly and poured into a customized mold to obtain a constraint layer. The constraint layer and the damping layer were bonded with an epoxy resin adhesive to obtain a high damping vibration-damping composite material for pipelines.

[0054] The performance of the high damping vibration reduction composite materials for pipelines obtained in Examples 1-5 and Comparative Examples 1-2 was tested, and the testing method was as follows: The elongation at break and elastic modulus of Examples 1-5 and Comparative Examples 1-2 were tested with reference to the standard GB / T 1040.3-2006 Damping and vibration-reducing composite materials for pipelines.

[0055] The composite loss factors of Examples 1-5 and Comparative Examples 1-2 were tested with reference to standard GB / T 16406 for damping and vibration-reducing composite materials for pipelines.

[0056] The loss factors of the damping layers of Examples 1-5 and Comparative Examples 1-2 were tested using a DMA1 dynamic mechanical thermal analyzer from METTLER-TOLEDO, Switzerland. The test used a tensile mode, a heating rate of 2°C / min, an amplitude of 1% strain, and a N2 atmosphere.

[0057] The P heat aging experiments of Examples 1-5 and Comparative Examples 1-2 were conducted on damping and vibration reduction composite materials for pipelines according to the standard GB / T7141-2008; heat aging conditions: humidity 100%, 120°C, 2atm, 48h.

[0058] The moisture and heat resistance tests of Examples 1-5 and Comparative Examples 1-2 were conducted in accordance with standard GB / T 1740 for damping and vibration reduction composite materials for pipelines.

[0059] Specifically, the performance test results of the vibration damping materials for pumps of Examples 1-5 and Comparative Examples 1-2 are shown in the following table.

[0060] Table 1 Comparison of the performance of the high damping vibration reduction composite materials for pipelines prepared in Examples 1-5 and the vibration reduction materials for pumps prepared in Comparative Examples 1-2

[0061] See Table 1 for a performance comparison of the high damping vibration reduction composite material for pipelines prepared in Examples 1-5 of the present invention and the vibration reduction material for pumps prepared in Comparative Examples 1-2; According to the above test, it can be seen that the damping material in the embodiment of the present invention is composed of a polyurethane system, and mica and graphene are added as fillers, and are compounded with a constrained layer of epoxy resin. Such a structural design helps to improve the mechanical properties and vibration reduction effect of the material. The comparative example is composed only of polyurethane without adding any filler, resulting in obvious deficiencies in mechanical properties, damping properties, etc. The innovation of Examples 1-5 of the present invention lies in that mica and graphene are added as fillers in the polyurethane-based damping layer. The embodiment not only gives the material better damping properties by adding mica and graphene, but also improves the loss factor of the material, and can more effectively absorb and attenuate vibration. This shows a more superior vibration reduction effect in the pipeline system, especially in complex vibration and impact environments. At the same time, the sheet structure of mica has an excellent mechanical reinforcement effect, which increases the strength and impact resistance of the material. At the same time, graphene, as a high-strength, good thermal conductivity filler, further enhances the wear resistance and heat resistance of the material. These fillers not only improve the chemical stability of the damping layer, but also improve its working performance under high temperature and complex stress environments. They are compounded with epoxy resin to form a constraint layer, which significantly improves the damping performance, mechanical properties, thermal conductivity and durability of the material, and solves the performance problems of the materials in comparative examples 1-2. Especially in terms of performance in long-term use and complex environments, the patent embodiments have significant advantages. These characteristics make the patent embodiments more outstanding in vibration reduction effect than the comparative examples, and meet the demand for high-performance vibration reduction materials for pipelines in practical applications.

[0062] The invention discloses a high damping vibration reduction composite material for pipelines and a preparation method thereof. The composite material consists of a damping layer and a constraining layer. The damping layer is a multi-component polyurethane system that is cured and formed in one step, wherein flaky mica and graphene are added as fillers to enhance the damping performance, wherein 45-70 parts of polyester polyol, 3-9 parts of small molecule chain extender, 0.1-0.3 parts of organic tin catalyst, 10-27 parts of isocyanate, and 5-30 parts of curing agent. 5-12 parts of flaky mica powder, 1-3 parts of graphene. The components are fully stirred and uniformly mixed under a vacuum environment to remove bubbles, and poured into a polytetrafluoroethylene mold that has been sprayed with an organic silicon release agent, dried and formed in a vacuum oven, and left to stand for 7 days for maturation after forming. The constraining layer is made of epoxy resin and curing agent mixed in proportion, and coated on the surface of the damping layer to form a pass, which is used to improve the overall structural stability of the composite material during the use of the pipeline. The high-damping vibration-damping composite material prepared by the present invention is aimed at the major national strategic needs and practical application needs, has excellent vibration-damping performance, high strength, chemical stability and other excellent properties, and can be used as a vibration-damping composite material in the field of vibration and noise reduction of pipelines and other equipment in special scenarios.

[0063] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A method for preparing a high damping vibration reduction composite material for a pipeline, characterized in that: The following steps are involved: The polyol, chain extender, metal catalyst, isocyanate, cross-linking curing agent, mica powder and graphene are mixed and stirred evenly, and after degassing, poured into a mold, dried, cured and formed, and matured to obtain a damping layer; Then, the epoxy resin and the curing agent are evenly mixed and poured into a mold to obtain a constrained layer; finally, the constrained layer is bonded to the surface of the damping layer through an epoxy resin adhesive to obtain a high damping vibration reduction composite material for pipelines.

2. The method for preparing the high damping vibration reduction composite material for pipelines according to claim 1, characterized in that: The mass ratio of the polyol, chain extender, metal catalyst, isocyanate, cross-linking curing agent, mica powder and graphene is (40-75): (4-10): (0.05-0.2): (15-45): (5-15): (5-12): (1-3).

3. The method for preparing the high damping vibration reduction composite material for pipelines according to claim 1, characterized in that: The thickness of the damping layer is 10-15 mm, the thickness of the constraining layer is 12-30 mm, and the thickness ratio of the constraining layer to the damping layer is (1.2-2):

1.

4. The method for preparing the high damping vibration reduction composite material for pipelines according to claim 1, characterized in that: The polyol is at least one of polytetrahydrofuran diol, polyoxypropylene diol, polycarbonate and poly(hexanediol adipate neopentyl glycol); wherein the relative molecular mass of polytetrahydrofuran diol is 1000 g / mol, the relative molecular mass of polyoxypropylene polyol is 1000 g / mol, and the relative molecular mass of poly(hexanediol adipate neopentyl glycol) is 2000 g / mol; The chain extender includes 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, adipic acid alcohol and dimethylolpropionic acid, and the amine chain extender is at least one of sodium ethylenediamine sulfonate and isophorone diamine; The metal catalyst is any one of stannous octoate, dibutyltin dilaurate, organotin T12 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 hydroxyethylethylenediamine, trimethylolpropane, castor oil and pentaerythritol.

5. The method for preparing the high damping vibration reduction composite material for pipelines according to claim 1, characterized in that: The particle size of the mica powder is 1-100 μm; the particle size of the graphene is 1-50 nm; the order of adding the mica powder and the graphene is to add the mica powder first and then the graphene, and fully stir after each addition, and the stirring rate is 300-500 rpm / min.

6. The method for preparing the high damping vibration reduction composite material for pipelines according to claim 1, characterized in that: The epoxy resin is at least one of E20, E44 and E51; the curing agent is polyamine or amine derivatives.

7. The method for preparing the high damping vibration reduction composite material for pipelines according to claim 1, characterized in that: The curing temperature is 60-120° C., and the curing time is 2-24 h.

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

9. The method for preparing a high damping vibration reduction composite material for pipelines according to claim 1, characterized in that: The damping layer and the constraining layer are bonded by hot pressing during the bonding process.

10. The high damping vibration reduction composite material for pipelines prepared by the preparation method according to any one of claims 1 to 9, characterized in that: It comprises a damping layer and a constraining layer coated on the surface of the damping layer; fillers are added in the damping layer, and the fillers comprise flaky mica and graphene.

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