WO2025026025A1 - Composite damping system, and composite damping material and preparation method therefor - Google Patents

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

The invention patent relates to the technical field of rubber materials, and specifically to a damping composite system and a damping composite material and a preparation method thereof.

Background Art

Polymer damping materials have functional properties such as shock absorption and noise reduction, and are widely used in the fields of automobiles, home appliances, transportation, etc. The damping properties of polymer damping materials mainly depend on the polymer molecular structure and formula combination, especially the polymer molecular structure plays a decisive role in the damping performance. Its damping mechanism is mainly energy dissipation, including energy dissipation of molecular chain segment movement, intermolecular friction, filler network destruction and reorganization, etc.

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.

At present, common 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.

Polymer damping materials mainly dissipate the kinetic energy of vibration by converting it into heat energy through the movement of polymer molecular chains. The molecular structure design of polymer damping materials plays a decisive role in the damping performance of the material. Due to problems such as chemistry and steric effect, it is often difficult to obtain an ideal single damping polymer material.

Therefore, composite damping materials have become the main method for people to develop damping materials, including blending of different polymers, blending of polymer-object materials, etc. In general, due to different molecular structures, different polymers cannot achieve complete compatibility at the molecular level, and the mixed polymer has a phase separation structure (0.1-100um) at the microscopic level; fillers can also improve the damping performance of polymers, and its mechanism is through the destruction and reorganization of the filler network and the friction between the filler and the polymer, but due to the poor compatibility between the two, its application is also subject to certain restrictions. In addition, non-cross-linked polymer molecules can undergo molecular slippage under external force and consume energy, playing a damping role, but 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; and usually the polymer compatibility is low, and the microscopic phase separation leads to poor cross-linking uniformity and low mechanical properties of the material due to inhomogeneity.

Summary of the invention

The purpose of the present invention is to solve the problems of poor damping effect of existing polymer damping materials, difficulty in obtaining single damping polymer materials, and molecular incompatibility of conventional composite damping materials, and to provide a damping composite system. The damping composite system is composed of completely compatible polymers with different cross-linking mechanisms, which can make the corresponding damping composite material have the characteristics of high damping, high strength and a wide range of material selection.

The present invention also aims to provide a damping composite material. The damping composite material is specifically a damping composite material of a molecular-level gel-unrestricted entanglement uniform interpenetrating network, which is based on the damping composite system with complete compatibility at the molecular level. The cross-linkable polymer in the system undergoes cross-linking to form an interpenetrating network polymer having a cross-linked network and the non-cross-linkable polymer forms a non-restricted entanglement network, so that the non-cross-linked polymer can consume energy in the cross-linked polymer network through entanglement-disentanglement, crawling movement, etc., thereby producing a damping effect, and has the characteristics of high damping, high strength and a wide temperature range of material application.

Another object of the present invention is to provide a method for preparing the damping composite material. The preparation method crosslinks the crosslinkable polymer in the damping composite system and adjusts its crosslinking density through mixing processing, and greatly improves the damping factor or damping modulus of the damping material through polymer combination, filler application and crosslinking system coordination, while ensuring high mechanical properties, to obtain the damping composite material.

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

A damping composite system comprises a cross-linkable polymer and a non-cross-linkable polymer, wherein the cross-linkable polymer is a polymer having an unsaturated double bond content of 1-10 wt %, and the non-cross-linkable polymer is a fully saturated polymer having a double bond content of less than 1 wt % and being unable to undergo a cross-linking reaction under the action of a cross-linking agent.

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.

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 %.

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.

As a further preferred embodiment of the damping composite system of the present invention, the part The degree of hydrogenation of the 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 5wt%.

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.

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%, and the difference between the ethylene content in the EPDM rubber and the ethylene content in the EPDM rubber is less than 5wt%.

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 cross-linkable polymer and the non-cross-linkable polymer is less than 3.

A damping composite material, comprising any of the above-mentioned damping composite systems, wherein 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;

Among them, the cross-linkable polymer is a partially hydrogenated nitrile rubber with a brand name Therban LT 1757, and the non-cross-linkable polymer is a fully hydrogenated nitrile rubber with a brand name Therban LT 1707.

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.

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.

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.

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 hindered phenol antioxidants, phosphite antioxidants and hindered amine antioxidants.

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-benzothiazole sulfenamide and 2-mercaptobenzothiazole.

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.

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 17wt%, and the unsaturation is 5.5%.

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 17wt%, and the unsaturation is less than 1%.

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

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.

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

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

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.

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

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 friction movement of non-cross-linked molecules in the cross-linked molecular network can be used to form high-performance damping systems with different uses, so that the corresponding damping composite material has the characteristics of high damping, high strength and a wide range of material selection.

The damping composite material of the present invention is based on the damping composite system. The cross-linkable polymer in the damping composite system generates 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 in the cross-linked polymer network through entanglement-disentanglement, creeping movement and the like, thereby generating a damping effect. The damping composite material has the characteristics of high damping, high strength and a wide temperature range of material application. In addition, according to the selection of different polymer types of the damping composite system, the material can be a high-performance damping material with different uses, such as a low-temperature resistant damping material, an oil-resistant damping material, an aging-resistant damping material, a foaming damping material and the like, and can be applied to many fields such as automobiles, home appliances and transportation.

The preparation method of the present invention crosslinks the crosslinkable polymer in the damping composite system and adjusts its crosslinking density through mixing processing, and greatly improves the damping factor or damping modulus of the damping material through polymer combination, filler application and crosslinking system coordination, increases the damping effect of the material, and ensures high mechanical properties to obtain the damping composite. Material.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of the phase state of polymer blend molecules of the damping composite system of the present invention in a specific embodiment.

FIG. 2 is a flow chart of the preparation process of the damping composite material of the present invention in a specific embodiment.

DETAILED DESCRIPTION

The technical solution of the present invention is further described in detail below in conjunction with specific embodiments, but the protection scope and implementation mode 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.

And, 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 the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

It should be understood that the singular forms used in the present invention, such as "a", include plural references unless otherwise specified. In addition, the terms "including", "containing", and "having" are open-ended definitions rather than closed-ended definitions, that is, they include the contents specified in the present invention, but do not exclude other aspects. In other words, the terms also include "essentially consisting of" or "consisting of".

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.

Unless otherwise specified, all technical and scientific terms used in this document have If there are multiple definitions for a term, the definition in this document shall prevail.

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

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

The damping composite system of the 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.

Among them, the cross-linkable 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%, 10wt%; and the non-cross-linkable polymer is a fully saturated polymer with a double bond content of less than 1% and cannot undergo a cross-linking reaction under the action of a cross-linking 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%, less than 0.2wt%.

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.

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%, such as the content of the unsaturated monomer isoprene can be 3wt%, 4wt%, 4.5wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, 10wt%, 11wt%, 12wt%, 13wt%, 14wt%, 15wt%, 16wt%, 17wt%, 18wt%, 19wt%, 20wt%, 21wt%, 22wt%, 23wt%, 24wt%, 25wt%, 26wt%, 27wt%, 28wt%, 29wt%, 30wt%, 31wt%, 32wt%, 33wt%, 34wt%, 35wt%, 36wt%, 37wt%, 38wt%, 39wt%, wt%, 5.5wt%, 6wt%, 6.5wt%, 7wt%, and 8wt% of butyl rubber.

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.

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 lightness of 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 92.5%, 93%, 93.5%, 94%, 94.5%, 95%, 95.5%, or 96%.

Moreover, the acrylonitrile content in the partially hydrogenated nitrile rubber differs from the acrylonitrile content in the fully hydrogenated nitrile rubber by less than 5wt%, such as the acrylonitrile content in the partially hydrogenated nitrile rubber differs from the acrylonitrile content in the fully hydrogenated nitrile rubber by 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%.

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 rubber/EPDM rubber combination.

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%.

Moreover, the ethylene content in EPDM rubber is different from that in EPDM rubber, that is, the difference in ethylene percentage is less than 5wt%. The difference between the content and the ethylene content in 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%, less than 0.1wt%.

As a preferred embodiment of the damping composite system of the present invention, the viscosity of the crosslinkable polymer and the non-crosslinkable polymer is different, and the viscosity of one is greater than the viscosity of the other, such as the viscosity of the crosslinkable polymer is greater than the viscosity of the non-crosslinkable polymer, or the viscosity of the non-crosslinkable polymer is greater than the viscosity of the crosslinkable polymer, which is specifically determined according to different selection combinations of the crosslinkable polymer and the non-crosslinkable polymer. Wherein, the ratio of the viscosity of the high-viscosity polymer to the viscosity of the low-viscosity polymer is less than 3, such as less than 2.5, less than 2, less than 1.5, less than 1, less than 0.5.

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.

Among them, the cross-linkable polymer can be a partially hydrogenated nitrile rubber with the brand name Therban LT 1757, and the non-cross-linkable polymer can be a fully hydrogenated nitrile rubber with the brand name Therban LT 1707.

In the damping composite material of the present invention, please refer to FIG1, wherein the solid lines in the figure represent the molecular segments of the cross-linkable polymer, the circles represent 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 of the damping composite system are compatible at the molecular level, and an interpenetrating double network polymer having a cross-linked network and an entangled network is formed through the cross-linking effect of the cross-linkable polymer, and the non-cross-linked polymer molecules can be Energy consumption is achieved through entanglement-disentanglement, crawling motion and other methods in the cross-linked polymer gel network. The relaxation loss behavior of the uncross-linked polymer greatly improves the damping performance of the material. Through the action of the damping composite system, the application of fillers and the coordination 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. In addition, 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, foaming damping materials, etc., which can be applied to many fields such as automobiles, home appliances, and transportation.

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, talcum powder and mica powder. In some preferred embodiments, the reinforcing agent is carbon black.

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.

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.

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.

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

As a further preferred embodiment of the damping composite material of the present invention, the vulcanization-promoting The agent includes one or more of N-tert-butyl-2-benzothiazole sulfenamide and 2-mercaptobenzothiazole.

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.

The preparation method of the damping composite material of the present invention is shown in FIG2 , and the process flow includes the following steps:

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

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

S3, adding the operating oil and mixing evenly;

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

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

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

As a preferred embodiment of the preparation method of the damping composite material of the present invention, the mixing described in S3 is mixing at 60-80 rpm for 2-5 minutes at 40-70° C. in an internal mixer. After mixing evenly, the mixture is discharged from the internal mixer to enter the next step of vulcanization mixing.

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

The technical solution of the present invention is described in detail below in conjunction with specific embodiments.

In the following specific examples, the sources and characteristics of some of the raw materials used are as follows:

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

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

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

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

Polyethylene-propylene-norbornene copolymer (EPDM), EPDM keltan 6950, ARLANXEO High Performance Elastomers Co., Ltd., ethylene content is about 45wt%, norbornene content is 9wt%, oil-filled content is 100PHR, Mooney viscosity is 62MU, and unsaturation is 9%.

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

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

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

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

Carbon black N330, Cabot Chemical Co., Ltd.

Carbon black N550, Cabot Chemical Co., Ltd.

Paraffin oil, Sinopec.

Dioctyl phthalate, DOP, China Petrochemical Corporation.

Accelerator TBBS, N-tert-butyl-2-benzothiazole sulfenamide, Qixiang Chemical Co., Ltd.

MBT, 2-mercaptobenzothiazole, Qixiang Chemical Co., Ltd.

BBPIB-40%, Qingdao Rhein Chemie Co., Ltd.

TAIC-70%, Qingdao Rhein Chemie Co., Ltd.

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

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

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

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.

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

Add operating oil and continue mixing until completely mixed;

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

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

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

The preparation method of the damping composite materials of Comparative Examples 1-8 is the same as the preparation method of the damping composite materials of Examples 1-8.

Performance Testing

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.

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

Table 4 Performance test results of damping composite materials of comparative examples 1-8

It can be seen from the test results of Table 3 and Table 4 that, compared with the damping composite materials of Examples 1-8, in the polymer composite material system used, the sulfur crosslinking system can realize the interpenetrating double network structure of the gel network-entanglement network, improve 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 seriously 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, and the comprehensive performance is poor. 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 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 double bonds of the crosslinkable polymer are too few and the degree of crosslinking is insufficient, it is not conducive to the improvement of the damping effect, and the damping modulus and loss factor are also reduced to a certain extent.

The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, this specification does not describe all possible combinations of the technical features in the above-mentioned embodiments. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. Moreover, the above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the invention patent.

It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims (10)

A damping composite material, characterized in that, by weight, the damping composite material 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; The cross-linkable polymer is a partially hydrogenated nitrile rubber with a brand name Therban LT 1757, and the non-cross-linkable polymer is a fully hydrogenated nitrile rubber with a brand name 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. The damping composite material according to claim 1, characterized in that the reinforcing agent comprises one or more of carbon black, white carbon black, talcum powder and mica powder. The damping composite material according to claim 1, characterized in that the operating oil comprises one or more of paraffin oil and dioctyl phthalate. The damping composite material according to claim 1 is characterized in that the anti-aging agent comprises one or more composite antioxidants selected from the group consisting of hindered phenol antioxidants, phosphite antioxidants and hindered amine antioxidants. 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. The damping composite material according to claim 1, characterized in that the vulcanization activator is a mixture of zinc oxide and stearic acid. The damping composite material according to claim 1, characterized in that the part The Mooney viscosity of the hydrogenated nitrile rubber is 70MU, the acrylonitrile content is 17wt%, and the unsaturation degree is 5.5%. 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%. The method for preparing the damping composite material according to any one of claims 1 to 8 is characterized by comprising the following steps: 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. The method for preparing a 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.