Composite damping system, and composite damping material and preparation method therefor

Abstract

The present invention relates to the technical field of rubber materials. Disclosed are a composite damping system, and a composite damping material and a preparation method therefor. The composite damping system of the present invention comprises a cross-linkable polymer and a non-cross-linkable polymer, wherein the cross-linkable polymer is a polymer with the content of unsaturated double bonds being 1-10 wt%, and the non-cross-linkable polymer is a completely saturated polymer with the content of double bonds being less than 1 wt%. The composite damping system of the present invention is composed of polymers which are completely compatible and have different crosslinking mechanisms and effects, thereby enabling the corresponding composite damping material to have the characteristics of high damping, high strength and a wide material selection range. The composite damping material of the present invention comprises the composite damping system. The composite damping material of the present invention has the characteristics of high damping, high strength and a wide material selection range. The preparation method of the present invention can be used for efficiently preparing a composite damping material having a high damping factor or damping modulus and high mechanical properties.

Description

A damping composite system and a damping composite material and a preparation method thereof Technical Field

[0001] The patent of this invention relates to the technical field of rubber materials, specifically to a damping composite system and a damping composite material and a preparation method thereof. Background Art

[0002] Polymer damping materials offer functional properties such as shock absorption and noise reduction, and are widely used in automotive, household appliances, and transportation applications. The damping properties of polymer damping materials are primarily determined by the polymer's molecular structure and formulation, with the molecular structure playing a crucial role in determining damping performance. The damping mechanism is primarily energy dissipation, including energy dissipation from molecular chain motion, intermolecular friction, and the destruction and reorganization of filler networks.

[0003] Expanding the selection range of damping materials, improving the damping factor or damping modulus of damping materials, and realizing the application of damping materials in different environments are the main issues in the development of damping materials and the main way to achieve the development of new damping materials.

[0004] At present, ordinary polymer damping materials are mainly highly cross-linked rubber composite materials, which mainly use the chain segment movement of rubber polymers during glass transition to achieve high energy consumption. Only polymers with specific molecular structures can achieve the expected high damping effect, resulting in a narrow selection range of damping materials and the damping effect is not easy to meet the requirements.

[0005] Polymer damping materials primarily dissipate vibrational kinetic energy by converting it into heat through the movement of polymer molecular chains. The molecular structure of polymer damping materials plays a decisive role in determining their damping performance. However, due to challenges in polymer polymerization kinetics, thermodynamics, and steric effects, it is often difficult to obtain an ideal single damping polymer material.

[0006] Therefore, composite damping materials have become the main method for developing damping materials, including blending of different polymers and polymer-material blending. Generally, due to different molecular structures, different polymers cannot achieve complete compatibility at the molecular level, and the mixed polymers have a phase separation structure (0.1-100um) at the microscopic level. Fillers can also improve the damping performance of polymers. The mechanism is through the destruction and reorganization of the filler network and the friction between the filler and the polymer. However, due to the poor compatibility between the two, their application is also subject to certain limitations. In addition, non-cross-linked polymer molecules can undergo molecular slip under external force and consume energy, playing a damping role. However, due to the poor mechanical properties of non-cross-linked elastomers, they can only be used as colloids and cannot be used as a single mechanical material. In addition, if the polymer composite system is completely cross-linked, the elasticity of the polymer system increases and the damping performance decreases. In addition, under normal circumstances, the polymer compatibility is low and microscopic phase separation occurs, resulting in poor cross-linking uniformity and low mechanical properties of the material due to heterogeneity.

[0007] Summary of the Invention

[0008] The present invention aims to address the problems of poor damping performance of existing polymer damping materials, the difficulty in obtaining single damping polymer materials, and the molecular incompatibility of conventional composite damping materials. The invention provides a damping composite system. This system utilizes fully compatible polymers with different cross-linking mechanisms, resulting in a damping composite material with high damping, high strength, and a wide range of material options.

[0009] The present invention also aims to provide a damping composite material. Specifically, the damping composite material is a molecular-level gel-unrestricted entangled uniform interpenetrating network damping composite material. Based on the damping composite system with complete molecular compatibility, the crosslinkable polymer in the damping composite system undergoes crosslinking to form an interpenetrating polymer network having a crosslinked network and the non-crosslinkable polymer forming an unrestricted entangled network. This allows the non-crosslinked polymer to dissipate energy within the crosslinked polymer network through entanglement and disentanglement, creeping motion, and other means, generating a damping effect. The damping composite material exhibits high damping, high strength, and a wide temperature range of application.

[0010] Another object of the present invention is to provide a method for preparing the damping composite material. This preparation method crosslinks the crosslinkable polymers in the damping composite system through mixing and adjusts their crosslink density. Furthermore, through the combination of polymers, filler application, and crosslinking system, the damping factor or damping modulus of the damping material is significantly increased while ensuring high mechanical properties, thereby obtaining the damping composite material.

[0011] The purpose of the present invention is achieved through the following technical solutions.

[0012] A damping composite system comprises a cross-linkable polymer and a non-cross-linkable polymer. The cross-linkable polymer is a polymer with an unsaturated double bond content of 1-10 wt%, and the non-cross-linkable polymer is a fully saturated polymer with a double bond content of less than 1 wt% and cannot undergo a cross-linking reaction under the action of a cross-linking agent.

[0013] As a preferred embodiment of the damping composite system of the present invention, the cross-linkable polymer is butyl rubber, and the non-cross-linkable polymer is polyisobutylene.

[0014] As a further preferred embodiment of the damping composite system of the present invention, the content of the unsaturated monomer isoprene in the butyl rubber is 3-8 wt %.

[0015] As a preferred embodiment of the damping composite system of the present invention, the cross-linkable polymer is partially hydrogenated nitrile rubber, and the non-cross-linkable polymer is fully hydrogenated nitrile rubber.

[0016] As a further preferred embodiment of the damping composite system of the present invention, the degree of hydrogenation of the partially hydrogenated nitrile rubber is 90-96%, and the difference between the acrylonitrile content in the partially hydrogenated nitrile rubber and the acrylonitrile content in the fully hydrogenated nitrile rubber is less than 5 wt %.

[0017] As a preferred embodiment of the damping composite system of the present invention, the cross-linkable polymer is EPDM rubber, and the non-cross-linkable polymer is EPDM rubber.

[0018] As a further preferred embodiment of the damping composite system of the present invention, the diene monomer content in the EPDM rubber is 4-10 wt%, and the difference in ethylene content between the EPDM rubber and the EPDM rubber is less than 5 wt%.

[0019] As a preferred embodiment of the damping composite system of the present invention, in any of the above damping composite systems, the ratio of the viscosity of the high-viscosity polymer to the viscosity of the low-viscosity polymer in the crosslinkable polymer and the non-crosslinkable polymer is less than 3.

[0020] A damping composite material, comprising any of the above-mentioned damping composite systems, wherein the damping composite material comprises the following components, calculated by weight: 50-80 parts of a cross-linkable polymer, 20-50 parts of a non-cross-linkable polymer, 20-60 parts of a reinforcing agent, 5-30 parts of an operating oil, 0.2-3 parts of an anti-aging agent, and 4-10 parts of a vulcanizing system;

[0021] The cross-linkable polymer is a partially hydrogenated nitrile rubber with a brand name of Therban LT 1757, and the non-cross-linkable polymer is a fully hydrogenated nitrile rubber with a brand name of Therban LT 1707.

[0022] As a preferred embodiment of the damping composite material of the present invention, the reinforcing agent includes one or more of carbon black, white carbon black, talc powder and mica powder.

[0023] As a preferred embodiment of the damping composite material of the present invention, the vulcanization system includes a sulfur vulcanization system, and the sulfur vulcanization system includes a vulcanization accelerator, a vulcanization activator and sulfur.

[0024] As a preferred embodiment of the damping composite material of the present invention, the process oil includes at least one of paraffin oil and dioctyl phthalate.

[0025] As a preferred embodiment of the damping composite material of the present invention, the anti-aging agent includes one or more composite antioxidants selected from the group consisting of hindered phenol antioxidants, phosphite antioxidants and hindered amine antioxidants.

[0026] As a preferred embodiment of the damping composite material of the present invention, the vulcanization accelerator includes one or more of N-tert-butyl-2-benzothiazolesulfenamide and 2-mercaptobenzothiazole.

[0027] As a preferred embodiment of the damping composite material of the present invention, the vulcanization activator is a mixture of zinc oxide and stearic acid.

[0028] As a preferred embodiment of the damping composite material of the present invention, the Mooney viscosity of the partially hydrogenated nitrile rubber is 70MU, the acrylonitrile content is 17 wt %, and the unsaturation degree is 5.5%.

[0029] As a preferred embodiment of the damping composite material of the present invention, the Mooney viscosity of the fully hydrogenated nitrile rubber is 74MU, the acrylonitrile content is 17 wt %, and the unsaturation degree is less than 1%.

[0030] The method for preparing the damping composite material described in any one of the above items comprises the following steps:

[0031] S1, uniformly mixing the cross-linkable polymer, the non-cross-linkable polymer and the anti-aging agent;

[0032] S2, adding the reinforcing agent and mixing evenly;

[0033] S3, adding the operating oil and mixing evenly;

[0034] S4, adding the vulcanization system, mixing evenly, and vulcanizing to obtain the damping composite material.

[0035] As a preferred embodiment of the method for preparing the damping composite material of the present invention, the mixing in S1 and S3 is performed in an internal mixer at 40-70° C. and 60-80 rpm for 2-5 minutes.

[0036] As a preferred embodiment of the method for preparing the damping composite material of the present invention, the mixing in S2 is performed in an internal mixer at 40-70° C. and 60-80 rpm for 2-5 minutes.

[0037] As a preferred embodiment of the method for preparing the damping composite material of the present invention, the mixing in S4 is uniformly mixed on an open mill, more preferably mixed at 60-80 rpm for 5 minutes at 40-70°C in an open mill.

[0038] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0039] The damping composite system of the present invention is composed of completely compatible polymers with different cross-linking mechanisms. According to the selection of different polymer types, the frictional movement of non-cross-linked molecules in the cross-linked molecular network can be used to form high-performance damping systems with different uses, thereby making the corresponding damping composite material have the characteristics of high damping, high strength and a wide range of material selection.

[0040] The damping composite material of the present invention is based on the damping composite system. The cross-linkable polymer in the damping composite system produces a cross-linking effect to form an interpenetrating double network polymer having a cross-linked gel network and a non-restricted entanglement network, so that the non-cross-linked polymer can realize energy consumption through entanglement-disentanglement, crawling movement, etc. in the cross-linked polymer network, thereby producing a damping effect. It has the characteristics of high damping, high strength and a wide temperature range of material application. According to the selection of different polymer types in the damping composite system, it can be a high-performance damping material with different uses such as low-temperature resistant damping material, oil-resistant damping material, aging-resistant damping material, foaming damping material, etc., and can be applied to many fields such as automobiles, home appliances, and transportation.

[0041] The preparation method of the present invention cross-links the cross-linkable polymer in the damping composite system and adjusts its cross-linking density through mixing processing, and greatly improves the damping factor or damping modulus of the damping material through polymer combination, filler application and coordination of the cross-linking system, increases the damping effect of the material, and at the same time ensures high mechanical properties to obtain the damping composite material. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] FIG1 is a schematic diagram of the polymer blend molecular phase state of the damping composite system of the present invention in a specific embodiment.

[0043] FIG2 is a flow chart of the preparation process of the damping composite material of the present invention in a specific embodiment. DETAILED DESCRIPTION

[0044] The technical solutions of the present invention are further described in detail below with reference to specific embodiments, but the scope of protection and implementation of the present invention are not limited thereto. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0045] Furthermore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0046] It should be understood that the singular forms used herein, such as "a," "an," and "the" include plural referents unless otherwise specified. Furthermore, the terms "comprising," "containing," and "having" are open-ended limitations, meaning they include the specified aspects of the invention but do not exclude any other aspects. In other words, these terms also encompass "consisting essentially of" or "consisting of."

[0047] In addition, "and combinations thereof" in the specification refers to any combination of all listed items. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0048] Unless otherwise specified, all technical and scientific terms used herein have the standard meanings in the art to which the claimed subject matter belongs. If there are multiple definitions for a term, the definition herein shall prevail.

[0049] Unless otherwise indicated, this invention employs standard nomenclature and standard laboratory procedures and techniques of analytical chemistry, synthetic organic chemistry, and optics.

[0050] Without violating the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain preferred embodiments of the present invention.

[0051] The damping composite system of the present invention comprises a cross-linkable polymer and a non-cross-linkable polymer which are completely compatible but have different cross-linking mechanisms, and is composed of a mixture of the cross-linkable polymer and the non-cross-linkable polymer.

[0052] Among them, the crosslinkable polymer is a polymer with an unsaturated double bond content of 1-10wt%, such as a polymer with an unsaturated double bond content of 1-8wt%, 2-6wt%, 3-5wt%, 1wt%, 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, and 10wt%; and the non-crosslinkable polymer is a fully saturated polymer with a double bond content of less than 1% and cannot undergo a crosslinking reaction under the action of a crosslinking agent, such as a fully saturated polymer with a double bond content of less than 0.8wt%, less than 0.7wt%, less than 0.6wt%, less than 0.5wt%, less than 0.4wt%, less than 0.3wt%, and less than 0.2wt%.

[0053] As a preferred embodiment of the damping composite system of the present invention, the cross-linkable polymer may be butyl rubber, and the non-cross-linkable polymer may be polyisobutylene, that is, a butyl rubber / polyisobutylene combination.

[0054] As a further preferred embodiment of the damping composite system of the present invention, in the butyl rubber / polyisobutylene combination, the content of the unsaturated monomer isoprene in the butyl rubber is 3-8wt%, for example, the butyl rubber may contain an unsaturated monomer isoprene content of 3wt%, 4wt%, 4.5wt%, 5wt%, 5.5wt%, 6wt%, 6.5wt%, 7wt%, or 8wt%.

[0055] As a preferred embodiment of the damping composite system of the present invention, the cross-linkable polymer may be partially hydrogenated nitrile rubber, and the non-cross-linkable polymer may be fully hydrogenated nitrile rubber, that is, a partially hydrogenated nitrile rubber / fully hydrogenated nitrile rubber combination.

[0056] As a further preferred embodiment of the damping composite system of the present invention, the partially hydrogenated nitrile rubber has a degree of hydrogenation of 85-96%, such as a hydrogenated nitrile rubber having a degree of hydrogenation of 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 92.5%, 93%, 93.5%, 94%, 94.5%, 95%, 95.5%, or 96%.

[0057] And the acrylonitrile content in the partially hydrogenated nitrile rubber differs from the acrylonitrile content in the fully hydrogenated nitrile rubber and is less than 5wt%, such as the acrylonitrile content in the partially hydrogenated nitrile rubber and the acrylonitrile content in the fully hydrogenated nitrile rubber can be different and be less than 4.5wt%, less than 4wt%, less than 3.5wt%, less than 3wt%, less than 2.5wt%, less than 2wt%, less than 1.5wt%, less than 1wt%, less than 0.5wt%, less than 0.2wt%, less than 0.1wt%.

[0058] As a preferred embodiment of the damping composite system of the present invention, the cross-linkable polymer may be EPDM rubber, and the non-cross-linkable polymer may be EPDM rubber, that is, an EPDM / EPDM rubber combination.

[0059] As a further preferred embodiment of the damping composite system of the present invention, the diene monomer content in the EPDM rubber is 4-10wt%, such as the EPDM rubber having a diene monomer content of 4-9wt%, 4-8wt%, 4-7wt%, 4-6wt%, 4-5wt%, 5-8wt%, 6-8wt%, 7-8wt%, 4wt%, 4.5wt%, 5wt%, 6wt%, 7wt%, or 8wt%.

[0060] Moreover, the difference in ethylene content between the EPDM rubber and the EPDM rubber, that is, the difference in ethylene percentage is less than 5wt%. For example, the difference in ethylene content between the EPDM rubber and the EPDM rubber can be less than 4.5wt%, less than 4wt%, less than 3.5wt%, less than 3wt%, less than 2.5wt%, less than 2wt%, less than 1.5wt%, less than 1wt%, less than 0.5wt%, less than 0.2wt%, or less than 0.1wt%.

[0061] In a preferred embodiment of the damping composite system of the present invention, the viscosity of the crosslinkable polymer and the non-crosslinkable polymer are different, with one having a greater viscosity than the other. For example, the viscosity of the crosslinkable polymer may be greater than the viscosity of the non-crosslinkable polymer, or vice versa, depending on the selected combination of the crosslinkable and non-crosslinkable polymers. The ratio of the viscosity of the high-viscosity polymer to the viscosity of the low-viscosity polymer is less than 3, for example, less than 2.5, less than 2, less than 1.5, less than 1, or less than 0.5.

[0062] The damping composite material of the present invention contains the damping composite system of the present invention. Calculated by mass, the damping composite material of the present invention comprises the following components: 50-80 parts of a cross-linkable polymer, 20-50 parts of a non-cross-linkable polymer, 20-60 parts of a reinforcing agent, 5-30 parts of an operating oil, 0.2-3 parts of an anti-aging agent, and 4-10 parts of a vulcanization system.

[0063] The cross-linkable polymer may be partially hydrogenated nitrile rubber with a brand name of Therban LT 1757, and the non-cross-linkable polymer may be fully hydrogenated nitrile rubber with a brand name of Therban LT 1707.

[0064] In the damping composite material of the present invention, please refer to Figure 1, in which the solid lines in the figure represent the molecular segments of the cross-linkable polymer, the circles are the cross-linking nodes of the cross-linkable polymer, and the dotted lines represent the molecular segments of the non-cross-linkable polymer; the cross-linkable polymer and the non-cross-linkable polymer in the damping composite system are compatible at the molecular level, and the cross-linking effect of the cross-linkable polymer forms an interpenetrating double network polymer having a cross-linked network and an entangled network. The non-cross-linked polymer molecules can realize energy consumption through entanglement-disentanglement, crawling motion, etc. in the cross-linked polymer gel network. Due to the relaxation loss behavior of the uncross-linked polymer, the damping performance of the material is greatly improved. Through the action of the damping composite system, the application of fillers and the cooperation of the cross-linking system, the damping factor or damping modulus of the damping material can be greatly improved, while ensuring high mechanical properties, so that the damping composite material has the advantages of high damping, high strength, and a wide temperature range of material application. Moreover, according to the selection of different polymer types in the damping composite system, high-performance damping materials with different uses can be obtained, such as low-temperature resistant damping materials, oil-resistant damping materials, aging-resistant damping materials, foam damping materials, etc., which can be applied to many fields such as automobiles, home appliances, and transportation.

[0065] As a preferred embodiment of the damping composite material of the present invention, the reinforcing agent includes one or more of carbon black, white carbon black, talc powder and mica powder. In some preferred embodiments, the reinforcing agent is carbon black.

[0066] As a preferred embodiment of the damping composite material of the present invention, the process oil includes at least one of paraffin oil and dioctyl phthalate.

[0067] As a preferred embodiment of the damping composite material of the present invention, the anti-aging agent includes one or more composite antioxidants selected from the group consisting of hindered phenol antioxidants, phosphite antioxidants and hindered amine antioxidants.

[0068] As a preferred embodiment of the damping composite material of the present invention, the vulcanization system includes a sulfur vulcanization system, and the sulfur vulcanization system includes a vulcanization accelerator, a vulcanization activator and sulfur.

[0069] In some preferred embodiments, the sulfur vulcanization system consists of a vulcanization accelerator, a vulcanization activator and sulfur.

[0070] As a further preferred embodiment of the damping composite material of the present invention, the vulcanization accelerator includes one or more of N-tert-butyl-2-benzothiazolesulfenamide and 2-mercaptobenzothiazole.

[0071] As a further preferred embodiment of the damping composite material of the present invention, the vulcanization activator is a mixture of zinc oxide and stearic acid.

[0072] The preparation method of the damping composite material of the present invention is shown in FIG2 . The process flow includes the following steps:

[0073] S1, uniformly mixing the cross-linkable polymer, the non-cross-linkable polymer and the anti-aging agent;

[0074] S2, adding the reinforcing agent and continuing to mix evenly;

[0075] S3, adding the operating oil and mixing evenly;

[0076] S4, adding the vulcanization system, mixing evenly, and vulcanizing to obtain the damping composite material.

[0077] As a preferred embodiment of the method for preparing the damping composite material of the present invention, the mixing in S1 is performed in an internal mixer at 40-70° C. and 60-80 rpm for 2-5 minutes.

[0078] As a preferred embodiment of the method for preparing the damping composite material of the present invention, the mixing in S2 is performed in an internal mixer at 40-70° C. and 60-80 rpm for 2-5 minutes.

[0079] As a preferred embodiment of the method for preparing the damping composite material of the present invention, the mixing described in S3 is performed in an internal mixer at 40-70°C and 60-80 rpm for 2-5 minutes. After uniform mixing, the material is subjected to binder removal, and the mixed material is discharged from the internal mixer for the next step of vulcanization mixing.

[0080] As a preferred embodiment of the method for preparing the damping composite material of the present invention, the mixing in S4 is uniformly mixed on an open mill, more preferably mixed at 60-80 rpm for 5 minutes at 40-70°C in an open mill.

[0081] The technical solution of the present invention is described in detail below with reference to specific embodiments.

[0082] In the following specific examples, the sources and properties of some of the raw materials used are as follows:

[0083] Partially hydrogenated nitrile rubber, Therban LT 1757, ARLANXEO High Performance Elastomers Co., Ltd., Mooney viscosity 70MU, acrylonitrile content 17wt%, unsaturation 5.5%.

[0084] Fully hydrogenated nitrile rubber, Therban LT 1707, ARLANXEO High Performance Elastomers Co., Ltd., Mooney viscosity 74MU, acrylonitrile content 17wt%, unsaturation less than 1%.

[0085] Partially hydrogenated nitrile rubber, Zetpol 1420L, Zeon Corporation, Mooney viscosity 72MU, unsaturation 10%.

[0086] Fully hydrogenated nitrile rubber, Zetpol 1000L, Zeon Corporation, Mooney viscosity 70MU, unsaturation less than 1%.

[0087] Polyethylene-propylene-norbornene copolymer (EPDM), EPDM keltan 6950, ARLANXEO High Performance Elastomers Co., Ltd., ethylene content of approximately 45 wt%, norbornene content of 9 wt%, oil-extending content of 100 PHR, Mooney viscosity of 62 MU, and unsaturation of 9%.

[0088] Polyethylene-propylene copolymer (ethylene propylene diene monomer rubber), EPR 0050, Jilin Petrochemical Co., Ltd., Mooney viscosity 55MU, unsaturation 0%.

[0089] Butyl rubber, IIR 2255, ExxonMobil (China) Co., Ltd., Mooney viscosity 46MU, unsaturation 2.2%.

[0090] Polyisobutylene-isoprene random copolymer rubber (butyl rubber), HIP-6, ARLANXEO High Performance Elastomers Co., Ltd., Mooney viscosity 50MU, isoprene content 5-6wt%, unsaturation 5-6%.

[0091] Polyisobutylene, B50, BASF Chemical Co., Ltd., Mooney viscosity 45MU, unsaturation 0%.

[0092] Carbon black N330, Cabot Chemical Co., Ltd.

[0093] Carbon black N550, Cabot Chemical Co., Ltd.

[0094] Paraffin oil, Sinopec.

[0095] Dioctyl phthalate, DOP, China Petrochemical Corporation.

[0096] Accelerator TBBS, N-tert-butyl-2-benzothiazolesulfenamide, Qixiang Chemical Co., Ltd.

[0097] MBT, 2-mercaptobenzothiazole, Qixiang Chemical Co., Ltd.

[0098] BBPIB-40%, Qingdao Rhine Chemical Co., Ltd.

[0099] TAIC-70%, Qingdao Rhine Chemical Co., Ltd.

[0100] The compositions of the damping composite materials of Examples 1-8 are shown in Table 1 below.

[0101] Table 1 Composition of the damping composite materials of Examples 1-8 (parts by mass)

[0102] The damping composite materials of Examples 1-8 were prepared in the following steps:

[0103] Under the selected crosslinking system, the crosslinkable polymer, the non-crosslinkable polymer and the anti-aging agent were mixed in an internal mixer at 60° C. and 60-80 RPM for 5 minutes until they were uniformly mixed.

[0104] Add the reinforcing agent and continue mixing for 3 minutes until the reinforcing agent and filler are evenly mixed;

[0105] Add operating oil and continue mixing until completely mixed;

[0106] The mixed material is discharged from the internal mixer; the mixed material mixed in the internal mixer is evenly mixed with the vulcanization system on an open mixer, and then vulcanized at high temperature in a mold to obtain a high-damping rubber material.

[0107] The compositions of the damping composite materials of Comparative Examples 1-8 are shown in Table 2 below.

[0108] Table 2 Composition of the damping composite materials of Comparative Examples 1-8 (parts by mass)

[0109] The preparation methods of the damping composite materials of Comparative Examples 1-8 are the same as the preparation methods of the damping composite materials of Examples 1-8.

[0110] Performance Testing

[0111] The damping composite materials prepared in Examples 1-8 and Comparative Examples 1-8 were subjected to performance tests including tensile strength (GB / T 528), loss modulus, and damping factor (GB / T 17809). The performance test results of the damping composite materials of Examples 1-8 are shown in Table 3 below, and the performance test results of the damping composite materials of Comparative Examples 1-8 are shown in Table 4 below.

[0112] Table 3 Performance test results of damping composite materials of Examples 1-8

[0113] Table 4 Performance test results of the damping composite materials of Comparative Examples 1-8

[0114] The test results in Tables 3 and 4 show that, compared with the damping composite materials of Examples 1-8, the sulfur crosslinking system in the polymer composite material system used can achieve an interpenetrating double network structure of a gel network and an entanglement network, thereby improving the damping performance of the material, such as the damping composite materials of Comparative Examples 1, 2, and 5, but the corresponding loss modulus is severely reduced. When the content of the non-crosslinkable polymer is too high or too low, the damping performance and strength of the material cannot be balanced, resulting in poor overall performance. When the content of the non-crosslinkable component is too low, the damping effect of the material is low, such as the damping composite materials of Comparative Examples 3, 5, and 6; when the content of the non-crosslinkable component is too high, the material strength is reduced compared with the damping composite materials of Examples 1-8, such as the damping composite materials of Comparative Examples 7 and 8. When the crosslinkable polymer has too few crosslinkable double bonds and the degree of crosslinking is insufficient, it is also not conducive to improving the damping effect, and the damping modulus and loss factor are also reduced to a certain extent.

[0115] The technical features of the above-described embodiments may be combined in any manner. To keep the description concise, this specification does not describe all possible combinations of the technical features in the above-described embodiments. However, as long as there are no contradictions in the combination of these technical features, they should be considered to be within the scope of this specification. Moreover, the above-described embodiments only express several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent.

[0116] It should be noted that those skilled in the art may make various modifications and improvements without departing from the scope of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be based on the appended claims.

Claims

1. A damping composite material, characterized in that: The damping composite material comprises the following components by weight: 50-80 parts of a cross-linkable polymer, 20-50 parts of a non-cross-linkable polymer, 20-60 parts of a reinforcing agent, 5-30 parts of an operating oil, 0.2-3 parts of an anti-aging agent, and 4-10 parts of a vulcanization system; The cross-linkable polymer is a partially hydrogenated nitrile rubber with a brand name of Therban LT 1757, and the non-cross-linkable polymer is a fully hydrogenated nitrile rubber with a brand name of Therban LT 1707; the vulcanization system is a sulfur vulcanization system, and the sulfur vulcanization system includes a vulcanization accelerator, a vulcanization activator and sulfur.

2. The damping composite material according to claim 1, characterized in that: The reinforcing agent includes one or more of carbon black, white carbon black, talcum powder and mica powder.

3. The damping composite material according to claim 1, characterized in that: The process oil includes at least one of paraffin oil and dioctyl phthalate.

4. The damping composite material according to claim 1, characterized in that: The anti-aging agent includes one or more composite antioxidants selected from hindered phenol antioxidants, phosphite antioxidants and hindered amine antioxidants.

5. The damping composite material according to claim 1, characterized in that: The vulcanization accelerator includes one or more of N-tert-butyl-2-benzothiazole sulfenamide and 2-mercaptobenzothiazole.

6. The damping composite material according to claim 1, characterized in that: The vulcanization activator is a mixture of zinc oxide and stearic acid.

7. The damping composite material according to claim 1, characterized in that: The Mooney viscosity of the partially hydrogenated nitrile rubber is 70MU, the acrylonitrile content is 17wt%, and the unsaturation degree is 5.5%.

8. The damping composite material according to claim 1, characterized in that: The Mooney viscosity of the fully hydrogenated nitrile rubber is 74MU, the acrylonitrile content is 17wt%, and the unsaturation is less than 1%.

9. The method for preparing the damping composite material according to any one of claims 1 to 8, characterized in that: The steps include: S1, mixing the cross-linkable polymer, the non-cross-linkable polymer and the anti-aging agent uniformly; S2, adding the reinforcing agent and mixing evenly; S3, adding the operating oil and mixing evenly; S4, adding the vulcanization system, mixing evenly, and vulcanizing to obtain the damping composite material.

10. The method for preparing the damping composite material according to claim 9, characterized in that: The mixing described in S1 and S3 is mixing at 60-80 rpm for 5 minutes at 40-70°C in an internal mixer; And / or, the mixing in S2 is mixing at 60-80 rpm for 3 minutes at 40-70° C. in an internal mixer; And / or, the mixing described in S4 is carried out in an open mill at 60° C. and 60-80 rpm for 2-5 minutes.

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