A method and system for characterizing damping properties of a rubber material

Abstract

The application discloses a kind of methods and systems for characterizing the damping performance of rubber material, and relates to the technical field of material performance characterization, according to the rubber material to be tested to be made into the same component, different composition ratio fixed diameter vulcanized rubber ball;At room temperature, the same component, different composition ratio fixed diameter vulcanized rubber ball is released at the same height, and the rebound height of the vulcanized rubber ball is obtained;The damping performance of the vulcanized rubber ball is characterized by the mass fraction of the rebound height of the single-component fixed-diameter vulcanized rubber ball.The method for characterizing the damping performance of the rubber material provided by the application can conveniently represent the damping performance of the rubber material at the experimental temperature by using the bouncing behavior of the rubber ball, and solves the problem of high cost and inconvenient measurement in the prior art for characterizing the damping performance of the rubber material.

Description

Technical Field

[0001] This invention relates to the field of material property characterization technology, and more specifically to a method and system for characterizing the damping properties of rubber materials. Background Technology

[0002] Vibration and noise control has long been a focus of attention, and the use of damping materials for vibration reduction is a common technical measure. There are many types of damping materials, among which viscoelastic damping materials are currently the most widely used vibration reduction and noise reduction materials in engineering, and rubber is one of the most commonly used viscoelastic damping materials. The development of damping materials requires characterizing their damping performance.

[0003] However, the unique property of rubber materials is their dynamic mechanical properties. Under alternating stress, the stress and strain of rubber materials are asynchronous, with strain lags behind stress, resulting in energy loss. The magnitude of this energy loss can be represented by the material's dynamic mechanical properties. To characterize the damping performance of a material, its dynamic mechanical properties need to be obtained. The parameter characterizing the dynamic mechanical properties of viscoelastic materials is the complex modulus M. The loss factor tanδ is expressed as the quotient of the loss modulus and the storage modulus. This method requires specialized instruments for measurement, resulting in significant investment and inconvenience. The steps of this method are as follows: prepare a dumbbell-shaped sample of rubber material, measure the width and thickness of the sample's working area, and input these measurements into the computer of the Dynamic Thermomechanical Analyzer (DMA). After mounting the sample and invoking the corresponding program, the DMA performs measurements according to the set conditions.

[0004] Therefore, how to reduce the cost of characterizing the damping performance of rubber materials in existing technologies and make the measurement more convenient is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a method and system for characterizing the damping performance of rubber materials, which can conveniently represent the damping performance of rubber materials at experimental temperatures by utilizing the bouncing behavior of rubber balls, thus solving the problems of high cost and inconvenient measurement in the prior art for characterizing the damping performance of rubber materials.

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

[0007] A method for characterizing the damping properties of rubber materials includes the following steps:

[0008] Step 1: Prepare vulcanized rubber balls of fixed diameter with the same composition but different proportions based on the rubber material to be tested;

[0009] Step 2: Release fixed-diameter vulcanized rubber balls with the same composition but different composition ratios at the same height at room temperature, and obtain the rebound height of the vulcanized rubber balls;

[0010] Step 3: The damping performance of the vulcanized rubber ball is characterized by summing the products of the mass fraction of the rebound height of the single-component, fixed-diameter vulcanized rubber ball.

[0011] Preferably, the composition for making vulcanized rubber balls specifically includes: 100 parts of the rubber material to be tested, 0-60 parts of filler, and 0-30 parts of functional additives.

[0012] Preferably, the rubber material to be tested includes one or more combinations of natural rubber (NR), styrene-butadiene rubber (SBR), cis-butadiene rubber (BR), butyl rubber (IIR), ethylene propylene rubber (EPDM), chloroprene rubber (CR), nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), fluororubber (FKM), silicone rubber (Q), and acrylate rubber (ACM).

[0013] Preferably, the diameter of the vulcanized rubber ball in step 1 is 10mm to 30mm.

[0014] Preferably, the height in step 2 is 0.1m to 0.5m.

[0015] Preferably, the damping performance of the vulcanized rubber microspheres is characterized in step 3 using the following formula;

[0016]

[0017]

[0018] in, The rubber A content in the raw rubber system is The height of the rubber ball's first bounce. The first rebound height of the rubber ball prepared for rubber A. The first rebound height of the rubber microsphere prepared from rubber A+1. The first rebound height of the rubber ball prepared from rubber A+n. Let A be the mass fraction of rubber A in the raw rubber system. This represents the mass fraction of rubber A+1 in the raw rubber system. Let A+n be the mass fraction of rubber A+n in the raw rubber system.

[0019] A system for characterizing the damping properties of rubber materials, comprising:

[0020] The preparation module is used to produce fixed-diameter vulcanized rubber spheres with the same composition but different composition ratios based on the rubber material to be tested.

[0021] The rebound height module is used to release fixed-diameter vulcanized rubber balls with the same composition but different composition ratios at the same height at room temperature, and to obtain the rebound height of the vulcanized rubber balls.

[0022] The characterization module is used to characterize the damping performance of vulcanized rubber balls by accumulating the product of the mass fraction of the rebound height of a single-component, fixed-diameter vulcanized rubber ball.

[0023] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a method and system for characterizing the damping performance of rubber materials. By utilizing the bouncing behavior of rubber balls, the damping performance of rubber materials at experimental temperatures can be conveniently represented, and the damping performance of blended rubbers can be predicted. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 The attached figure is a flowchart of the steps provided by the present invention;

[0026] Figure 2(a) is a schematic diagram of the bounce height of the blended rubber ball with 0% NR mass fraction provided by the present invention;

[0027] Figure 2(b) is a schematic diagram of the bounce height of the blended rubber ball with 20% NR mass fraction provided by the present invention;

[0028] Figure 2(c) is a schematic diagram of the bounce height of the blended rubber ball with 40% NR mass fraction provided by the present invention;

[0029] Figure 2(d) is a schematic diagram of the bounce height of the blended rubber ball with 60% NR mass fraction provided by the present invention;

[0030] Figure 2(e) is a schematic diagram of the bounce height of the blended rubber ball with 80% NR mass fraction provided by the present invention;

[0031] Figure 2(f) is a schematic diagram of the bounce height of the blended rubber ball with 100% NR mass fraction provided by the present invention. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] like Figure 1 As shown in the figure, an embodiment of the present invention discloses a method for characterizing the damping performance of rubber materials, comprising the following steps:

[0034] Step 1: Prepare vulcanized rubber balls of fixed diameter with the same composition but different proportions based on the rubber material to be tested;

[0035] Step 2: Release fixed-diameter vulcanized rubber balls with the same composition but different composition ratios at the same height at room temperature, and obtain the rebound height of the vulcanized rubber balls;

[0036] Step 3: The damping performance of the vulcanized rubber ball is characterized by summing the products of the mass fraction of the rebound height of the single-component, fixed-diameter vulcanized rubber ball.

[0037] In one specific embodiment, the composition for making vulcanized rubber balls specifically includes: 100 parts of the rubber material to be tested, 0-60 parts of filler, and 0-30 parts of functional additives.

[0038] In one specific embodiment, the rubber material to be tested includes one or more combinations of natural rubber (NR), styrene-butadiene rubber (SBR), cis-butadiene rubber (BR), butyl rubber (IIR), ethylene propylene rubber (EPDM), chloroprene rubber (CR), nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), fluororubber (FKM), silicone rubber (Q), and acrylate rubber (ACM).

[0039] In one specific embodiment, the diameter of the vulcanized rubber ball in step 1 is fixed at 10mm~30mm.

[0040] In one specific embodiment, the height in step 2 is 0.1m to 0.5m.

[0041] In one specific embodiment, the damping performance of the vulcanized rubber ball is characterized in step 3 using the following formula;

[0042]

[0043]

[0044] in, The rubber A content in the raw rubber system is The height of the rubber ball's first bounce. The first rebound height of the rubber ball prepared for rubber A. The first rebound height of the rubber microsphere prepared from rubber A+1. The first rebound height of the rubber ball prepared from rubber A+n. Let A be the mass fraction of rubber A in the raw rubber system. This represents the mass fraction of rubber A+1 in the raw rubber system. Let A+n be the mass fraction of rubber A+n in the raw rubber system.

[0045] In Example 1, the material composition of the sample preparation is as follows (parts by weight):

[0046] Natural rubber (NR): 0-100 parts

[0047] Chlorinated butyl rubber (CIIR): 0~100 parts

[0048] Filler: 50 parts

[0049] Functional additives: 5 parts

[0050] Characterization of damping properties of rubber materials

[0051] Step 1: Prepare vulcanized rubber balls of fixed diameter with the same composition but different proportions based on the rubber material to be tested;

[0052] Step 2: Release fixed-diameter vulcanized rubber balls with the same composition but different composition ratios at the same height at room temperature, and obtain the rebound height of the vulcanized rubber balls;

[0053] Step 3: The damping performance of the vulcanized rubber ball is characterized by summing the products of the mass fraction of the rebound height of the single-component, fixed-diameter vulcanized rubber ball.

[0054] The greater the loss height, the better the damping performance of the material that makes up the sphere at room temperature.

[0055] like Figures 2(a)-2(f) The figures shown represent the rebound curves of rubber balls made from NR / CIIR blends. Figures (a), (b), (c), (d), (e), and (f) represent NR mass fractions of 0%, 20%, 40%, 60%, 80%, and 100%, respectively. All subsequent figures are denoted as NR-n, where n is the mass fraction of NR. The table below shows that NR-0 has the largest height loss, while NR-100 has the smallest. Therefore, NR-0 has the best damping performance, and NR-100 has the worst damping performance.

[0056] Table 1. Rebound height and loss height of NR / CIIR blended rubber balls

[0057]

[0058] The damping properties of rubber blends can be characterized using the following formula:

[0059]

[0060]

[0061] in, The NR content in the raw rubber system is The height of the rubber ball's first bounce. The first rebound height of the rubber microsphere prepared by NR. The first rebound height of the rubber microsphere prepared by CIIR. This represents the mass fraction of NR in the raw rubber system. This represents the mass fraction of CIIR in the raw rubber system.

[0062] Table 2. Rebound height and predicted height of NR / CIIR blended rubber balls

[0063]

[0064] In Example 2, the material composition of the sample preparation is as follows (parts by weight):

[0065] Ethylene propylene diene monomer (EPDM) rubber: 0~100 parts

[0066] Chlorinated butyl rubber (CIIR): 0~100 parts

[0067] Filler: 50 parts

[0068] Functional additives: 5 parts

[0069] Step 1: Prepare vulcanized rubber balls of fixed diameter with the same composition but different proportions based on the rubber material to be tested;

[0070] Step 2: Release fixed-diameter vulcanized rubber balls with the same composition but different composition ratios at the same height at room temperature, and obtain the rebound height of the vulcanized rubber balls;

[0071] Step 3: The damping performance of the vulcanized rubber ball is characterized by summing the products of the mass fraction of the rebound height of the single-component, fixed-diameter vulcanized rubber ball.

[0072] As shown in the table below, EPDM-0 has the largest loss height and the best damping performance, while EPDM-100 has the smallest loss height and the worst damping performance.

[0073] Table 3. Rebound height and loss height of EPDM / CIIR blended rubber balls

[0074]

[0075] The damping properties of EPDM / CIIR blends are predicted using the following formula.

[0076]

[0077]

[0078] in, The EPDM content in the raw rubber system is The height of the rubber ball's first bounce. The first rebound height of the rubber microspheres prepared by EPDM. The first rebound height of the rubber microsphere prepared by CIIR. This represents the mass fraction of EPDM in the raw rubber system. This represents the mass fraction of CIIR in the raw rubber system.

[0079] The table below shows the actual and predicted rebound heights of the EPDM / CIIR blend rubber balls.

[0080] Table 4. Rebound height and predicted height of EPDM / CIIR blended rubber balls

[0081]

[0082] In one specific embodiment, a system for characterizing the damping properties of rubber materials is provided, comprising:

[0083] The preparation module is used to produce fixed-diameter vulcanized rubber spheres with the same composition but different composition ratios based on the rubber material to be tested.

[0084] The rebound height module is used to release fixed-diameter vulcanized rubber balls with the same composition but different composition ratios at the same height at room temperature, and to obtain the rebound height of the vulcanized rubber balls.

[0085] The characterization module is used to characterize the damping performance of vulcanized rubber balls by accumulating the product of the mass fraction of the rebound height of a single-component, fixed-diameter vulcanized rubber ball.

[0086] The present invention provides a method and system for characterizing the damping performance of rubber materials. Compared with the traditional method of characterizing rubber damping performance using a dynamic thermomechanical analyzer, this method and system can conveniently represent the damping performance of rubber materials at experimental temperatures by utilizing the bouncing behavior of rubber balls, and can predict the damping performance of blended rubbers.

[0087] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0088] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for characterizing the damping properties of rubber materials, characterized in that, include: Step 1: Prepare vulcanized rubber balls of fixed diameter with the same composition but different composition ratios based on the rubber material to be tested; Step 2: Release fixed-diameter vulcanized rubber balls with the same composition but different composition ratios at the same height at room temperature, and obtain the rebound height of the vulcanized rubber balls; Step 3: The damping performance of the vulcanized rubber ball is characterized by summing the product of the rebound height and mass fraction of the single-component fixed-diameter vulcanized rubber ball; In step 3, the damping performance of the vulcanized rubber ball is characterized by the following formula; in, The rubber A content in the raw rubber system is The height of the rubber ball's first bounce. The first rebound height of the rubber ball prepared for rubber A. The first rebound height of the rubber microsphere prepared from rubber A+1. The first rebound height of the rubber ball prepared from rubber A+n. This represents the mass fraction of rubber A in the raw rubber system. This represents the mass fraction of rubber A+1 in the raw rubber system. Let A+n be the mass fraction of rubber A+n in the raw rubber system.

2. The method for characterizing the damping properties of rubber materials according to claim 1, characterized in that, The specific composition for making vulcanized rubber balls includes: 100 parts of the rubber material to be tested, 0-60 parts of filler, and 0-30 parts of functional additives.

3. The method for characterizing the damping properties of rubber materials according to claim 2, characterized in that, The rubber materials to be tested include one or more combinations of natural rubber, styrene-butadiene rubber, cis-butadiene rubber, butyl rubber, ethylene propylene rubber, chloroprene rubber, nitrile rubber, hydrogenated nitrile rubber, fluororubber, silicone rubber, and acrylate rubber.

4. The method for characterizing the damping properties of rubber materials according to claim 2, characterized in that, In step 1, the diameter of the vulcanized rubber ball is fixed at 10mm to 30mm.

5. The method for characterizing the damping properties of rubber materials according to claim 1, characterized in that, The height in step 2 is 0.1m to 0.5m.

6. A system for characterizing the damping performance of rubber materials, using the method for characterizing the damping performance of rubber materials according to any one of claims 1-5, characterized in that, include: The preparation module is used to produce fixed-diameter vulcanized rubber balls with the same composition but different composition ratios based on the rubber material to be tested. The rebound height module is used to release fixed-diameter vulcanized rubber balls with the same composition but different composition ratios at the same height at room temperature, and obtain the rebound height of the vulcanized rubber balls. The characterization module is used to characterize the damping performance of vulcanized rubber balls by summing the product of the rebound height and mass fraction of a single-component, fixed-diameter vulcanized rubber ball.

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