Micro-nano laminated damping material and preparation method thereof

Abstract

The present application relates to damping material, provide a kind of micro-nano laminated damping material, including low modulus damping material and high modulus damping material of alternative overlap arrangement;The modulus of low modulus damping material is 2-5MPa, and the modulus of high modulus damping material is 15-30MPa;The thickness ratio of high modulus damping material and low modulus damping material is 4-5:1.The micro-nano laminated damping material and its preparation method of the present application, by setting the thickness, number of layers of high modulus damping material and low modulus damping material and thickness ratio, to make the final damping material have optimal damping performance.

Description

Technical Field

[0001] This invention relates to the technical field of damping materials, and more specifically, to a micro / nano laminated damping material and its preparation method. Background Technology

[0002] Marine damping and vibration reduction technology encompasses a range of engineering and technical solutions designed to reduce vibrations, shocks, and swaying of ships during maritime operations, thereby improving ship performance, crew comfort, and equipment safety. This includes the use of various technologies and devices such as passive damping devices, active control systems, liquid dampers, and active hull stabilizers to reduce the impact of vibrations and shocks on the hull and equipment, ultimately improving the efficiency and reliability of maritime transport. Marine damping and vibration reduction technology plays a crucial role in the advancement of the maritime industry and the success of maritime transport, particularly in material selection, simulation testing, and multifunctional design.

[0003] Meanwhile, the field of marine vibration reduction technology based on micro / nano laminated damping materials aims to reduce the vibrations and shocks experienced by ships during operation at sea through the design and application of multilayer structural materials, thereby improving the stability of the hull structure and the reliability of equipment, and reducing maintenance costs. This innovative technology will provide higher levels of safety, comfort, and performance for maritime transport and ship equipment, offering new opportunities for the future development and application of marine vibration reduction.

[0004] However, no detailed study has been conducted on the conditions under which the damping materials, and the combination thereof, exhibit optimal damping performance. Summary of the Invention

[0005] The purpose of this invention is to provide a micro / nano laminated damping material and its preparation method, which achieves optimal damping performance by setting reasonable thicknesses, number of layers, and thickness ratios of high-modulus and low-modulus damping materials.

[0006] The embodiments of the present invention are achieved through the following technical solutions: The micro-nano laminated damping material of the present invention includes alternatingly overlapping low-modulus damping materials and high-modulus damping materials; the components of the low-modulus damping material include 30-35 wt.% nitrile rubber, 12-15 wt.% hydrogenated nitrile rubber, 1.1-1.5 wt.% activator NH-2, 0.9-1.1 wt.% silane coupling agent, 6.9-7.1 wt.% chlorinated paraffin, 9-15 wt.% channel black, 9-13 wt.% glass flakes and glass microspheres, 9-13 wt.% dioctyl phthalate, 0.5-0.6 wt.% accelerator DM, and 1-1.5 wt.% sulfur; the components of the high-modulus damping material include 29-34 wt.% nitrile rubber, 21-24 wt.% hydrogenated nitrile rubber, and 0.7-0.9 wt.% activator NH-2. The composition includes: wt.%, silane coupling agent 0.6-0.8 wt.%, chlorinated paraffin 4-6 wt.%, channel black 19-22 wt.%, glass flakes and glass microspheres 8-11 wt.%, dioctyl phthalate 2.1-2.5 wt.%, accelerator DM 0.5-0.7 wt.%, and sulfur 1.2-1.7 wt.%. Firstly, micro / nano multilayer damping materials are composed of multiple tiny layers of material stacked together. These layers adapt to vibrations of different frequencies and amplitudes, and the degree of shear deformation under vibration excitation improves energy dissipation efficiency. Secondly, due to the performance differences between high-modulus and low-modulus damping materials, a new interface loss will form at the interface, introducing a new energy dissipation mechanism (interface slip energy dissipation), further improving the energy dissipation efficiency of the damping material, thus providing a more precise vibration reduction effect. Compared with homogeneous materials, micro / nano multilayer materials can more effectively dissipate vibration energy, thereby reducing the vibration amplitude of ships.

[0007] Furthermore, the modulus of the low-modulus damping material is 2-5 MPa.

[0008] Furthermore, the modulus of the high-modulus damping material is 15-30 MPa.

[0009] Furthermore, the thickness of the low-modulus damping material is 0.1-0.2 mm.

[0010] Furthermore, the thickness of the high-modulus damping material is 0.4-1 mm.

[0011] Furthermore, the total thickness of the low-modulus damping material and the high-modulus damping material is 1-3 mm. Within a certain range, the more layers of micro-nano stacking, the better; however, when the number of layers exceeds a certain limit, the entire structure becomes equivalent to a homogeneous damping structure, failing to demonstrate the damping and constraint effects of the microstructure.

[0012] Furthermore, the thickness ratio of the high-modulus damping material to the low-modulus damping material is 4-5:1. In the entire structure, the high-damping rubber acts as a constraint structure, and the low-damping rubber acts as a damping structure. Within a certain thickness, if the constraint rubber is too thin, the constraint effect cannot be achieved. Therefore, it is necessary to select the optimal layer thickness ratio within a certain range based on the required constraint effect.

[0013] This invention also provides a method for preparing micro / nano-layered damping materials, comprising the following steps:

[0014] (1) Low-modulus damping material was prepared using an open mill and subjected to micro-nano layer compression to form it into a sheet;

[0015] (2) High modulus damping material was prepared using an open mill and subjected to micro-nano layer compression to form it into a sheet;

[0016] (3) Use a micro-nano layered co-extrusion device to perform micro-nano layered co-extrusion on the low modulus damping material obtained in step (1) and the high modulus damping material obtained in step (2) to make them into micro-nano layered damping materials.

[0017] The technical solution of the present invention has at least the following advantages and beneficial effects: the micro-nano laminated damping material and its preparation method of the present invention, by setting reasonable thickness, thickness ratio and number of layers of high modulus damping material and low modulus damping material, achieves a relatively ideal state between the high composite loss factor brought by high modulus material and the low composite loss factor brought by low modulus damping material, so that the final damping material has the best damping performance. Detailed Implementation

[0018] The low-modulus damping materials and high-modulus damping materials used in Examples 1-3 and Comparative Examples 1-4 have the same composition, as shown below:

[0019] The components of the low-modulus damping material include 33 wt.% nitrile rubber, 15 wt.% hydrogenated nitrile rubber, 1.5 wt.% activator NH-2, 1 wt.% silane coupling agent, 7 wt.% chlorinated paraffin, 15 wt.% channel black, 13 wt.% glass flakes and glass microspheres, 13 wt.% dioctyl phthalate, 0.5 wt.% accelerator DM, and 1 wt.% sulfur.

[0020] The high-modulus damping material comprises 30.4 wt.% nitrile rubber, 24 wt.% hydrogenated nitrile rubber, 0.9 wt.% activator NH-2, 0.8 wt.% silane coupling agent, 6 wt.% chlorinated paraffin, 22 wt.% channel black, 11 wt.% glass flakes and glass microspheres, 2.5 wt.% dioctyl phthalate, 0.7 wt.% accelerator DM, and 1.7 wt.% sulfur.

[0021] Example 1

[0022] This embodiment provides a method for preparing a micro / nano laminated damping material, including the following steps:

[0023] Low-modulus damping material with a strength of 3 MPa was selected and used to produce low-modulus damping layer sheets using a two-roll open milling machine. High-modulus damping material with a strength of 15 MPa was selected and used to produce high-modulus damping layer sheets using the same two-roll open milling machine. Then, the high-modulus damping layer and the low-modulus damping layer were alternately stacked and placed into a micro-nano laminated co-extrusion equipment for co-extrusion to produce a 4-layer laminated damping material with each low-modulus damping material layer being 0.2 mm thick and each high-modulus damping material layer being 0.8 mm thick.

[0024] Example 2

[0025] This embodiment provides a method for preparing a micro / nano laminated damping material, including the following steps:

[0026] Low-modulus damping material with a strength of 3 MPa was selected and a low-modulus damping layer sheet was produced using a two-roll open milling machine. High-modulus damping material with a strength of 15 MPa was selected and a high-modulus damping layer sheet was produced using the same two-roll open milling machine. Then, the high-modulus damping layer and the low-modulus damping layer were alternately stacked and placed into a micro-nano stacked co-extrusion equipment for co-extrusion to produce an 8-layer stacked damping material with each layer of low-modulus damping material being 0.1 mm thick and each layer of high-modulus damping material being 0.4 mm thick.

[0027] Example 3

[0028] This embodiment provides a method for preparing a micro / nano laminated damping material, including the following steps:

[0029] Low-modulus damping material with a strength of 3 MPa was selected and a low-modulus damping layer sheet was produced using a two-roll open milling machine. High-modulus damping material with a strength of 15 MPa was selected and a high-modulus damping layer sheet was produced using the same two-roll open milling machine. Then, the high-modulus damping layer and the low-modulus damping layer were alternately stacked and placed into a micro-nano laminated co-extrusion equipment for co-extrusion to produce a laminated damping material with two layers, each containing 0.2 mm of low-modulus damping material and 1 mm of high-modulus damping material.

[0030] Comparative Example 1

[0031] This comparative example provides a low-modulus damping material, the preparation method of which is as follows:

[0032] A 3MPa low-modulus damping material was selected and a 4mm thick low-modulus damping layer was made using a two-roll open milling machine, and then vulcanized using a flat vulcanizing machine.

[0033] Comparative Example 2

[0034] This comparative example provides a high-modulus damping material, the preparation method of which is as follows:

[0035] A 15MPa high-modulus damping material was selected and a 4mm thick high-modulus damping layer was made using a two-roll open milling machine, and then vulcanized using a flat vulcanizing machine.

[0036] Comparative Example 3

[0037] This comparative example provides a damping material, the preparation method of which is as follows:

[0038] A 0.1 mm thick low-modulus damping layer was made from a 3 MPa low-modulus damping material using a two-roll open mill. A 1 mm thick high-modulus damping layer was made from a 15 MPa high-modulus damping material using the same two-roll open mill. Then, a four-layer laminated damping material was fabricated using an alternating layering method of high-modulus and low-modulus layers. Finally, the laminated damping material was vulcanized using a flat vulcanizing machine to obtain the final sample.

[0039] Comparative Example 4

[0040] This comparative example provides a damping material, the preparation method of which is as follows:

[0041] A 0.2 mm thick low-modulus damping layer was made from a 3 MPa low-modulus damping material using a two-roll open mill. A 0.4 mm thick high-modulus damping layer was made from a 15 MPa high-modulus damping material using the same two-roll open mill. Then, an 8-layer laminated damping material was fabricated using an alternating high-modulus and low-modulus layer stacking method. Finally, the laminated damping material was vulcanized using a flat vulcanizing machine to obtain the final sample.

[0042] Experimental Example

[0043] The composite loss factor of the damping materials prepared in Examples 1-3 and Comparative Examples 1-4 was tested. The thickness and number of layers of each group are shown in Table 1 below, and the test results are shown in Table 2 below (average value of multiple measurements).

[0044] The testing procedure followed GB / T 16406, specifically as follows: Damping material was adhered to a 1mm galvanized plate using epoxy resin, followed by a 0.5mm carbon fiber plate. After the neoprene adhesive cured, the structural damping of the sample was tested using the cantilever beam method. The sample was mounted vertically, with the upper part of the galvanized plate rigidly clamped in the unbonded rubber area, while the lower part was free. A transducer at the lower end applied continuous harmonic excitation to the sample, while a transducer in the middle detected the vibration signal of the sample, obtaining the resonance curve. Based on the resonance curve, the composite loss factor was calculated using the formula: tanα = 2Δf2 / f2, from the second-order resonance frequency f2 and the resonance peak width Δf2. In the experiment, the damping ratio values ​​of samples SH and S4 could not be directly read from their second-order characteristic peaks.

[0045] Table 1. Thickness and number of layers in Examples 1-3 and Comparative Examples 1-4

[0046]

[0047] Table 2. Results of Composite Loss Factor Test

[0048]

[0049] The magnitude of the composite loss factor can reflect the damping performance. The larger the composite loss factor, the better the damping performance and the better the vibration reduction effect of the material. As can be seen from Table 2, the composite loss factors of Examples 1-3 of this application are significantly greater than those of Comparative Examples 1-4, that is, the damping material prepared based on the technical solution of this application has better performance.

[0050] Specifically, Comparative Examples 1-2, due to the presence of only low-modulus damping materials (or high-modulus damping materials), exhibit lower composite loss factors than the Examples, even with the same thickness. Comparative Examples 3-4, while containing both low-modulus and high-modulus damping materials as Examples 1-3, also suffer from lower composite loss factors due to the lack of a suitable thickness ratio. This demonstrates that the composite loss factor is actually influenced by a combination of factors, requiring appropriate parameter settings, and the technical solution presented in this application offers significant advantages.

[0051] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A micro / nano-layered damping material, characterized in that, It includes alternating low-modulus damping materials and high-modulus damping materials; the modulus of the low-modulus damping material is 2-5 MPa, and the modulus of the high-modulus damping material is 15-30 MPa; The thickness ratio of the high-modulus damping material to the low-modulus damping material is 4-5:1; The thickness of the low-modulus damping material is 0.1-0.2 mm; the thickness of the high-modulus damping material is 0.4-1 mm. The low-modulus damping material comprises 30-35 wt.% nitrile rubber, 12-15 wt.% hydrogenated nitrile rubber, 1.1-1.5 wt.% activator NH-2, 0.9-1.1 wt.% silane coupling agent, 6.9-7.1 wt.% chlorinated paraffin, 9-15 wt.% channel black, 9-13 wt.% glass flakes and glass microspheres, 9-13 wt.% dioctyl phthalate, 0.5-0.6 wt.% accelerator DM, and 1-1.5 wt.% sulfur. The high-modulus damping material comprises 29-34 wt.% nitrile rubber, 21-24 wt.% hydrogenated nitrile rubber, 0.7-0.9 wt.% activator NH-2, 0.6-0.8 wt.% silane coupling agent, 4-6 wt.% chlorinated paraffin, 19-22 wt.% channel black, 8-11 wt.% glass flakes and glass microspheres, 2.1-2.5 wt.% dioctyl phthalate, 0.5-0.7 wt.% accelerator DM, and 1.2-1.7 wt.% sulfur.

2. The micro / nano laminated damping material according to claim 1, characterized in that, The total thickness of the low-modulus damping material and the high-modulus damping material is 1-3 mm.

3. A method for preparing the micro / nano laminated damping material according to claim 1 or 2, characterized in that, Includes the following steps: (1) Use an open mill to prepare low-modulus damping material and compress it to make it into sheets; (2) High modulus damping material is prepared using an open mill and compressed to form sheets; (3) Use a micro-nano layered co-extrusion device to perform micro-nano layered co-extrusion on the low modulus damping material obtained in step (1) and the high modulus damping material obtained in step (2) to make them into micro-nano layered damping materials.

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