Particle-filled damping rubber plate with good sound insulation performance and preparation method

Abstract

The invention provides a particle-filled damping rubber plate with good sound insulation performance and a preparation method. The particle-filled damping rubber plate comprises a rubber matrix and scatterer particles, wherein the rubber matrix is filled with the scatterer particles; the rubber matrix is mainly prepared from the following raw materials in parts by weight: 90-110 parts of nitrile rubber, 0.1-0.5 part of a coupling agent, 10-20 parts of a vulcanizing agent and 10-18 parts of a plasticizer; and the scatterer particles are one or a combination of more of iron, nickel and cobalt. The particle-filled damping rubber plate is prepared from the rubber matrix and the scatterer particles, low-frequency noise is absorbed and blocked to the maximum extent by means of the scattering effect and the constrained damping resonance energy consumption effect of the particles, and the purposes of expanding the sound insulation frequency band and improving the low-frequency sound insulation and noise reduction effect are achieved.

Description

Technical Field

[0001] The invention relates to the field of sound insulation, and in particular to a particle-filled damping rubber plate with good sound insulation performance and a preparation method thereof. Background Art

[0002] As the demand for electricity continues to increase, my country's UHV projects are being rapidly constructed. The UHV DC converter station is the core of the UHV DC project to achieve mutual conversion between AC and DC. The oil-immersed equipment in the converter station is a core equipment of the UHV converter station. It is mainly low-frequency noise, and the noise power level can reach 90~110dB(A), which has a serious adverse impact on the surrounding environment. Effective noise reduction material measures need to be taken to control its impact on the factory boundary and surrounding noise-sensitive buildings.

[0003] At present, the UHV oil-immersed equipment under construction and in operation is often arranged near the wall of the substation. Its noise is loud and has a long transmission distance. It is difficult to effectively control the noise of oil-immersed equipment using traditional noise reduction methods. At the same time, due to the uneven manufacturing process of UHV reactors, the main focus of research is on electrical safety and reliability, and insufficient attention is paid to noise. The reserve of noise reduction technology is insufficient, and traditional materials cannot meet the demand. The bottleneck of noise control has gradually become prominent, and it has gradually become a problem of noise control in UHV projects.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The first object of the present invention is to provide a particle-filled damping rubber plate with good sound insulation performance. The particle-filled damping rubber plate is prepared by using a rubber matrix and scatterer particles, and the particle scattering effect and constrained damping resonance energy dissipation effect are utilized to absorb and block low-frequency noise to the maximum extent, thereby achieving the goal of expanding the sound insulation band and improving the low-frequency sound insulation and noise reduction effect.

[0006] The second object of the present invention is to provide a method for preparing the particle-filled damping rubber sheet, which has simple steps, is easy to operate, and is suitable for industrial production.

[0007] The third purpose of the present invention is to provide a low-noise insulating material for oil-immersed equipment. The insulating material is made of insulating cardboard and particle-filled damping rubber plate. Placing the insulating material inside the oil-immersed equipment mailbox can greatly improve the noise reduction effect. At the same time, the materials used in the present invention are all common materials, which greatly reduces the cost of use and meets the use requirements.

[0008] In order to achieve the above object, the present invention particularly adopts the following technical solutions:

[0009] The present invention provides a particle-filled damping rubber plate with good sound insulation performance, characterized in that it comprises a rubber matrix, and scatterer particles filled in the rubber matrix;

[0010] The rubber matrix is ​​mainly made of the following raw materials, by weight: 90-110 parts of nitrile rubber, 0.1-0.5 parts of coupling agent, 10-20 parts of vulcanizing agent and 10-18 parts of plasticizer;

[0011] The scatterer particles are one or a combination of iron, nickel and cobalt.

[0012] Preferably, the rubber matrix is ​​mainly made of the following raw materials, calculated by weight: 95-105 parts of nitrile rubber, 0.2-0.4 parts of coupling agent, 11-15 parts of vulcanizing agent and 11-13 parts of plasticizer.

[0013] Preferably, the rubber matrix is ​​mainly made of the following raw materials, measured by weight: 100 parts of nitrile rubber, 0.3 parts of coupling agent, 12 parts of vulcanizing agent and 12 parts of plasticizer.

[0014] The present invention uses scatterer particles and a rubber matrix to prepare a particle-filled damping rubber plate, utilizes the particle scattering effect and the constrained damping resonance energy dissipation effect, absorbs and blocks low-frequency noise to the greatest extent, and achieves the goal of expanding the sound insulation frequency band and improving the low-frequency sound insulation and noise reduction effect.

[0015] The present invention selects scatterer particles as one or a combination of iron, nickel and cobalt. This is because iron, cobalt and nickel are simple magnetic metals, which can be induced in a magnetic field in the subsequent process to form an effective arrangement structure in the rubber matrix, thereby improving the sound insulation effect. At the same time, the cost of iron, cobalt and nickel is relatively low, but it has good sound insulation performance, which can greatly reduce the cost of use.

[0016] Preferably, the coupling agent is γ-methacryloxypropyltrimethoxysilane, the vulcanizing agent is dicumyl peroxide, and the plasticizer is 1,2-propylene glycol.

[0017] Preferably, the scatterer particles are dispersed inside the rubber substrate in a spatial cubic lattice structure;

[0018] The diameter of the scatterer particles is 1-5000 μm.

[0019] In this embodiment, the scatterer particles are designed in a spatial cubic lattice structure inside the rubber matrix. The spatial cubic lattice structure has a simple configuration, a relatively dense structure, and good symmetry. The magnetic field induction process is easy to implement in preparing cubic lattices in the rubber matrix, and can be used to soundproof and reduce noise in a target specific frequency band, and effectively eliminate the noise in the target specific frequency band. However, if the scatterer particles are randomly dispersed in the rubber matrix, a spatial cubic lattice structure cannot be formed, and the noise in the target specific frequency band cannot be effectively eliminated, which will greatly affect the sound insulation effect of the prepared particle-filled damping rubber sheet.

[0020] The present invention also provides a method for preparing the particle-filled damping rubber sheet, which is characterized by comprising the following steps:

[0021] The scatterer particles are filled into a rubber matrix and vulcanized to obtain a target product.

[0022] Preferably, before filling the scatterer particles into the rubber matrix, the distance between the scatterer particles needs to be calculated, which includes the following steps:

[0023] The relationship between the scatterer particle spacing and the sound insulation performance is: L = 15lg (πr 3 ρf / 3a 2 )-28;

[0024] Where L is the sound insulation performance of the particle-filled damping rubber sheet, in dB; r is the radius of the scatterer particle, in m; ρ is the density of the scatterer particle, in kg / m 3 ; f is the frequency of the incident sound wave, in Hz; a is the spacing between scatterer particles, in m, and π is the circumference of a circle.

[0025] Of course, in actual operation, the spacing of the scatterer particles calculated based on the sound wave frequency selected by the customer and the radius, density, sound insulation performance, etc. of the scatterer particles may be a non-repeating decimal. Therefore, in the specific operation process, in order to facilitate processing, after calculating the main parameters, the parameters are adjusted to the maximum extent possible according to customer needs and combined with actual processing capabilities.

[0026] Preferably, filling the scatterer particles into the rubber matrix comprises the following steps:

[0027] Filling the scatterer particles into the rubber matrix includes the following steps:

[0028] Adding the scatterer particles to the rubber matrix, adding a rubber dispersant, stirring sufficiently, and applying a magnetic field of 0.08-1.5T around the rubber matrix;

[0029] The distance between two adjacent scatterer particles is a.

[0030] Preferably, the rubber dispersant is magnesium methacrylate.

[0031] Preferably, the vulcanization process includes the following steps:

[0032] At 20-60° C., adding a vulcanizing agent, a coupling agent and a plasticizer to the nitrile rubber in sequence, rotating and mixing, to obtain a liquid rubber matrix;

[0033] Preferably, the rotation speed is 20-50 rpm;

[0034] Preferably, the mixing time is 20-50 min.

[0035] Preferably, the above preparation method further comprises a method for processing the liquid rubber matrix, the method comprising the following steps:

[0036] vulcanizing the obtained liquid rubber matrix and the scatterer particle structure to obtain a target product;

[0037] Preferably, the vulcanization includes one-stage vulcanization and two-stage vulcanization, and the one-stage vulcanization is carried out in a magnetic field;

[0038] Preferably, the temperature of the first stage vulcanization is 148-250° C., the time of the first stage vulcanization is 5-15 min, the temperature of the second stage vulcanization is 160-195° C., and the time of the second stage vulcanization is 10-30 min.

[0039] In the present invention, the scatterer particles are first fixed on the connecting wire made of butyl rubber according to the rule that the spacing between two adjacent scatterer particles is a, the connecting wire with the scatterer particles is arranged in a liquid rubber matrix, and a magnetic field is applied to fix it, and then it is cured to ensure the position of the scatterer particles and to ensure that the scatterer particles can be distributed in the rubber matrix in a spatial cubic lattice structure to ensure the sound insulation effect.

[0040] The present invention also provides a low-noise insulating material for oil-immersed equipment, the insulating material comprising insulating paperboard and a particle-filled damping rubber plate;

[0041] The particle-filled damping rubber sheet is arranged in the middle of the insulating paperboard.

[0042] Compared with the prior art, the present invention has at least the following advantages:

[0043] (1) The present invention prepares a particle-filled damping rubber sheet by using scatterer particles and a rubber matrix. The scatterer particles are distributed in the rubber matrix in a spatial cubic lattice structure, and the particle scattering effect and constrained damping resonance energy dissipation effect of the scatterer particles are utilized to absorb and block the low-frequency noise emitted by the iron core inside the oil-immersed equipment to the maximum extent, thereby achieving the goal of expanding the sound insulation band and improving the low-frequency sound insulation and noise reduction effect. At the same time, by selecting appropriate materials and placing the materials inside the oil tank of the oil-immersed equipment, the noise reduction effect is improved compared to traditional materials, and the application cost is reduced.

[0044] (2) The present invention arranges the scatterer particles into a spatial cubic lattice structure, which has a simple configuration, a relatively dense structure, and good symmetry. It can insulate and reduce noise in a target specific frequency band, and can greatly improve the sound insulation effect of the prepared particle-filled damping rubber sheet.

[0045] (3) The present invention proposes a noise reduction design method for the sound insulation and noise reduction composite material inside the oil tank of oil-immersed equipment, which provides a clear design method and effective design basis for accurate and effective noise reduction of oil-immersed equipment, improves the accuracy of noise reduction and improves operability.

[0046] (4) The present invention has a simple structure and uses common materials, which meet the material requirements of the equipment and are easy to be mass-produced and applied to oil-immersed equipment in converter stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0048] Figure 1 A schematic diagram of the structure of a low-noise insulating material provided by an embodiment of the present invention;

[0049] Figure 2 A schematic diagram of the structure of scatterer particles provided in an embodiment of the present invention.

[0050] in,

[0051] 1-scatterer particles; 2-rubber matrix; 3-insulating paperboard. DETAILED DESCRIPTION

[0052] The embodiments of the present invention will be described in detail below in conjunction with the examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention. If specific conditions are not specified in the examples, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0053] Example 1

[0054] This embodiment provides a low-noise insulation material for oil-immersed equipment, which is made of insulating paperboard and particle-filled damping rubber sheet. In this embodiment, Figure 1 As shown, the insulating material is made of two insulating cardboards 3 and one particle-filled damping rubber plate. The particle-filled damping rubber plate is arranged between the two insulating cardboards 3. The particle-filled damping rubber plate includes scatterer particles 1 and a rubber mass 2.

[0055] In this embodiment, a method for preparing the particle-filled damping rubber sheet is also provided, which comprises the following steps:

[0056] (1) Determine the distance between scatterer particles:

[0057] First, the type of scatterer particles is determined according to the customer's needs. In this embodiment, the sound wave frequency f that the customer needs to isolate is 100 Hz, the required sound insulation performance L is 35 dB, the material of the selected scatterer particles is iron, the radius r of the scatterer particles is 0.001 m, and the density ρ of the scatterer particles is 7900 kg / m 3 , π is the ratio of pi, and L = 15lg (πr 3 ρf / 3a 2 )-28 is used to calculate the scatterer particle spacing a. After adjusting the parameters, the scatterer particle spacing a is calculated to be 0.0002m.

[0058] (2) Preparation of liquid rubber matrix:

[0059] At a temperature of 50° C., 12 parts of dicumyl peroxide, 0.3 parts of γ-methacryloxypropyltrimethoxysilane and 12 parts of 1,2-propylene glycol were added to 100 parts of nitrile rubber in sequence, and kneaded at a speed of 30 rpm for 30 minutes to form a liquid rubber matrix. Of course, in this embodiment, the parts of each raw material are parts by weight.

[0060] (3) Preparation of particle-filled damping rubber sheet:

[0061] The liquid rubber matrix prepared in (2) is added with scatterer particles, magnesium methacrylate is added and the scatterer particles are evenly dispersed by a stirrer. According to the design method of the scatterer particle structure of the particle-filled damping rubber plate, a 1.2T magnetic field is applied to the outside of the liquid rubber matrix by using a mold for 10 hours. The magnetic field is applied to the inside of the liquid rubber matrix to form a magnetic field with a spacing of 0.0002m. Figure 2 The scatterer particle structure shown in FIG. After sulfurization under the action of a magnetic field, the following is obtained: Figure 1 A particle filled damping rubber sheet with scatterer particles is shown.

[0062] The vulcanization process includes one-stage vulcanization and two-stage vulcanization, wherein the one-stage vulcanization process is carried out in a 1.2T magnetic field, the temperature of the one-stage vulcanization is 210°C, and the time of the one-stage vulcanization is 10 minutes. The temperature of the two-stage vulcanization is 175°C, and the time of the two-stage vulcanization is 20 minutes.

[0063] (5) Testing:

[0064] The particle-filled damping rubber sheet prepared in (4) was tested for sound insulation performance using the national standards GB / T19889.3-2005 Laboratory measurement of airborne sound insulation of building components and GB / Z27764-2011 Transfer matrix method for measuring sound transmission loss in acoustic impedance tubes. The test used standard technical methods to detect sound insulation performance.

[0065] It can be seen that the sound insulation performance can reach 36.7dB, which meets the customer's need to achieve sound insulation performance of 35dB.

[0066] Embodiment 2-5

[0067] The specific implementation is consistent with that of Example 1, except that the differences are shown in Table 1 below:

[0068] Table 1 Influence of raw material ratio on sound insulation performance

[0069]

[0070] Embodiment 6-8

[0071] The specific implementation is consistent with that of Example 1, except that the differences are shown in Table 2 below:

[0072] Table 2 Effect of preparation conditions on sound insulation performance

[0073] Example 6 Example 7 Example 8 (2) Temperature / ℃ 20 60 40 (2) Speed / rpm 20 50 45 (2) Mixing time / min 20 50 25 (3) Magnetic field / T 0.08 1.5 1.0 First stage vulcanization temperature / ℃ 148 250 160 One vulcanization time / min 5 15 12 Second stage vulcanization temperature / ℃ 160 195 180 Second stage vulcanization time / min 10 30 15 Sound insulation performance / dB 36.2 36.1 36.0

[0074] Example 9

[0075] The specific implementation is consistent with Example 1, the only difference being that the scatterer particles are irregularly dispersed inside the rubber matrix. According to tests, the sound insulation performance is 30 dB.

[0076] Example 10

[0077] The specific implementation is consistent with Example 1, except that the customer's needs are different, resulting in different prepared particle-filled damping rubber plates. The specific operation steps are as follows:

[0078] The method for preparing the particle-filled damping rubber sheet comprises the following steps:

[0079] (1) Determine the distance between scatterer particles:

[0080] In this embodiment, the sound wave frequency f that the customer needs to isolate is 200 Hz, the required sound insulation performance L is 30 dB, the material of the selected scatterer particles is iron, the radius r of the scatterer particles is 0.002 m, and the density ρ of the scatterer particles is 7900 kg / m 3 , π is the ratio of pi, and L = 15lg (πr 3 ρf / 3a 2 )-28 is used to calculate the scatterer particle spacing a. After adjusting the parameters, the scatterer particle spacing a is calculated to be 0.001m.

[0081] (2) Preparation of liquid rubber matrix:

[0082] At a temperature of 50° C., 14 parts of dicumyl peroxide, 0.4 parts of γ-methacryloxypropyltrimethoxysilane and 13 parts of 1,2-propylene glycol were added to 100 parts of nitrile rubber in sequence, and kneaded at a speed of 30 rpm for 30 minutes to form a liquid rubber matrix. Of course, in this embodiment, the parts of each raw material are parts by weight.

[0083] (3) Preparation of particle-filled damping rubber sheet:

[0084] The liquid rubber matrix prepared in (2) is added with scatterer particles, and the rubber dispersant magnesium methacrylate is added and the scatterer particles are evenly dispersed by a stirrer. According to the design method of the scatterer particle structure of the particle-filled damping rubber plate, a 1.0T magnetic field is applied to the outside of the liquid rubber matrix by using a mold for 12 hours. The magnetic field is applied to form a 0.001m spacing in the liquid rubber matrix. Figure 2 The scatterer particle structure shown. Under the action of the magnetic field

[0085] The vulcanization process includes one-stage vulcanization and two-stage vulcanization, wherein the one-stage vulcanization process is carried out in a magnetic field of 1.0T, the temperature of the one-stage vulcanization is 200°C, and the time of the one-stage vulcanization is 10 minutes. The temperature of the two-stage vulcanization is 175°C, and the time of the two-stage vulcanization is 20 minutes.

[0086] (5) Testing:

[0087] The particle-filled damping rubber sheet prepared in (4) was tested for sound insulation performance, and it was found that the sound insulation performance could reach 33.8 dB, which meets the customer's requirement of achieving a sound insulation performance of 30 dB at 200 Hz.

[0088] Embodiment 11

[0089] The specific implementation is consistent with Example 1, except that the customer's needs are different, resulting in different prepared particle-filled damping rubber plates. The specific operation steps are as follows:

[0090] The method for preparing the particle-filled damping rubber sheet comprises the following steps:

[0091] (1) Determine the distance between scatterer particles:

[0092] In this embodiment, the sound wave frequency f that the customer needs to isolate is 500 Hz, the required sound insulation performance L is 40 dB, the material of the selected scatterer particles is nickel, the radius r of the scatterer particles is 0.0025 m, and the density ρ of the scatterer particles is 8900 kg / m 3 , π is the ratio of pi, and L = 15lg (πr 3 ρf / 3a 2 )-28 is used to calculate the scatterer particle spacing a. After adjusting the parameters, the scatterer particle spacing a is calculated to be 0.0012m.

[0093] (2) Preparation of liquid rubber matrix:

[0094] At a temperature of 45° C., 15 parts of dicumyl peroxide, 0.4 parts of γ-methacryloxypropyltrimethoxysilane and 15 parts of 1,2-propylene glycol were added to 100 parts of nitrile rubber in sequence, and kneaded at a speed of 30 rpm for 25 minutes to form a liquid rubber matrix. Of course, in this embodiment, the parts of each raw material are parts by weight.

[0095] (3) Preparation of particle-filled damping rubber sheet:

[0096] The liquid rubber matrix prepared in (2) is added with scatterer particles, and the rubber dispersant magnesium methacrylate is added and the scatterer particles are evenly dispersed by a stirrer. According to the design method of the scatterer particle structure of the particle-filled damping rubber plate, a 1.0T magnetic field is applied to the outside of the liquid rubber matrix by using a mold for 11 hours. The magnetic field is applied to the inside of the liquid rubber matrix to form a 0.0012m spacing as shown in FIG. Figure 2 The scatterer particle structure shown. Under the action of magnetic field

[0097] The vulcanization process includes one-stage vulcanization and two-stage vulcanization, wherein the one-stage vulcanization process is carried out in a magnetic field of 1.0T, the temperature of the one-stage vulcanization is 210°C, and the time of the one-stage vulcanization is 10 minutes. The temperature of the two-stage vulcanization is 175°C, and the time of the two-stage vulcanization is 20 minutes.

[0098] (5) Testing:

[0099] The particle-filled damping rubber sheet prepared in (4) was tested for sound insulation performance, and it was found that the sound insulation performance could reach 42.8 dB, which meets the customer's requirement of achieving a sound insulation performance of 40 dB at 500 Hz.

[0100] Comparative Example 1

[0101] The specific implementation is consistent with Example 1, the only difference being that no scatterer particles are arranged in the rubber matrix. According to tests, the sound insulation performance is 20 dB.

[0102] Comparative Example 2

[0103] The specific implementation is consistent with Example 1, the only difference being that the scatterer particles are silver. According to tests, the sound insulation performance is 22 dB.

[0104] Through the above analysis, it can be seen that the present invention not only uses scatterer particles and rubber matrix to prepare particle-filled damping rubber plates, but also limits the structure of the scatterer particles: the scatterer particles are dispersed in the interior of the rubber matrix in a spatial cubic lattice structure, which can absorb and block noise to the greatest extent. As shown in Example 9, the scatterer particles are dispersed in the interior of the rubber matrix in an irregular state, which results in the scatterer particles being unable to form a spatial cubic lattice structure in the rubber matrix, and being unable to effectively eliminate the target specific frequency band noise, which also results in its sound insulation effect being significantly inferior to that produced by Example 1. At the same time, since it cannot form a spatial cubic lattice structure, it cannot effectively eliminate noise, and it also cannot meet customer needs.

[0105] As for Comparative Example 1, we can see that it does not use scatterer particles, so the material for sound insulation in Comparative Example 1 is a rubber matrix. Therefore, when sound insulating, relative to Example 1, Example 1 has a spatial cubic lattice structure formed by scatterer particles, which can effectively eliminate the target specific frequency band noise during actual operation and have a good sound insulation effect. However, the rubber matrix in Comparative Example 1 does not have a spatial cubic lattice structure formed by scatterer particles, and its sound insulation effect is obviously not as good as that of Example 1, and it also cannot meet customer needs.

[0106] In Comparative Example 2, silver is selected as the scatterer particle, and its sound insulation effect cannot meet the needs of customers. This is because the magnetic particles of iron, cobalt and nickel have a single element and good magnetic properties. At the same time, their sound insulation performance is good. The external magnetic field induction process is convenient to prepare with low cost. The metal elements are still easy to recover after the material is used. The preparation process of other metals besides iron, cobalt and nickel, such as silver, copper and other metals, is complicated, and the sound insulation performance and magnetic properties are relatively inferior to iron, cobalt and nickel. Therefore, its sound insulation effect is not as good as the sound insulation effect of Example 1, and it also cannot meet customer needs.

[0107] To sum up, in order to achieve good sound insulation effect, in this embodiment, the ratio and preparation method of the low-noise insulating material need to be prepared as much as possible within the range provided by the present invention, otherwise the quality of the prepared low-noise insulating material may not meet customer needs.

[0108] Finally, it is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the principles and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A particle-filled damping rubber sheet with good sound insulation performance, characterized in that: The damping rubber plate includes a rubber matrix and scatterer particles filled in the rubber matrix; The rubber matrix is ​​mainly made of the following raw materials, by weight: 90-110 parts of nitrile rubber, 0.1-0.5 parts of coupling agent, 10-20 parts of vulcanizing agent and 10-18 parts of plasticizer; The scatterer particles are one or a combination of iron, nickel and cobalt.

2. The particle-filled damping rubber sheet according to claim 1, characterized in that: The rubber matrix is ​​mainly made of the following raw materials, calculated by weight: 95-105 parts of nitrile rubber, 0.2-0.4 parts of coupling agent, 11-15 parts of vulcanizing agent and 11-13 parts of plasticizer.

3. The particle-filled damping rubber sheet according to claim 1, characterized in that: The rubber matrix is ​​mainly made of the following raw materials, calculated by weight: 100 parts of nitrile rubber, 0.3 parts of coupling agent, 12 parts of vulcanizing agent and 12 parts of plasticizer.

4. The particle-filled damping rubber sheet according to claim 1, characterized in that: The scatterer particles are dispersed in the rubber substrate in a spatial cubic lattice structure; The diameter of the scatterer particles is 1-5000 μm.

5. The method for preparing the particle-filled damping rubber sheet according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: The scatterer particles are filled into a rubber matrix and vulcanized to obtain a target product.

6. The preparation method according to claim 5, characterized in that: Before filling the scatterer particles into the rubber matrix, the distance between the scatterer particles needs to be calculated, which includes the following steps: The relationship between the scatterer particle spacing and the sound insulation performance is: L = 15lg (πr 3 ρf / 3a 2 )-28; Where L is the sound insulation performance of the particle-filled damping rubber sheet, in dB; r is the radius of the scatterer particle, in m; ρ is the density of the scatterer particle, in kg / m 3 ; f is the frequency of the incident sound wave, in Hz; a is the spacing between scatterer particles, in m, and π is the circumference of a circle.

7. The preparation method according to claim 6, characterized in that: Filling the scatterer particles into the rubber matrix includes the following steps: Adding the scatterer particles to the rubber matrix, adding a rubber dispersant, stirring sufficiently, and applying a magnetic field of 0.08-1.5T around the rubber matrix; The distance between two adjacent scatterer particles is a.

8. The preparation method according to claim 5, characterized in that: When vulcanization is carried out, the following steps are included: At 20-60° C., vulcanizing agent, coupling agent and plasticizer are sequentially added to the nitrile rubber, and the mixture is rotated at a speed of 20-50 rpm and mixed for 20-50 minutes to obtain a liquid rubber matrix.

9. The preparation method according to claim 8, characterized in that: Also included is a method for treating a liquid rubber matrix, the method comprising the steps of: vulcanizing the obtained liquid rubber matrix and the scatterer particle structure to obtain a target product; The vulcanization includes one-stage vulcanization and two-stage vulcanization, and the one-stage vulcanization is carried out in a magnetic field; The temperature of the first stage vulcanization is 148-250° C., the time of the first stage vulcanization is 5-15 minutes, the temperature of the second stage vulcanization is 160-195° C., and the time of the second stage vulcanization is 10-30 minutes.

10. A low-noise insulating material for oil-immersed equipment, characterized in that: The insulating material comprises: Insulating paperboard, and the particle-filled damping rubber sheet as described in any one of claims 1 to 4 or the particle-filled damping rubber sheet prepared by the preparation method provided in any one of claims 5 to 9; The particle-filled damping rubber sheet is arranged in the middle of the insulating paperboard.

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