Low-volatile, low-permeability oil-resistant, voltage-resistant, aging-resistant, flame-retardant, and wave-absorbing material and preparation method thereof

Abstract

The present invention discloses a low-volatility, low-permeability, oil-resistant, voltage-resistant, aging-resistant, flame-retardant absorbing material and a preparation method thereof. The low-volatility, low-permeability, oil-resistant, voltage-resistant, aging-resistant, flame-retardant absorbing material comprises the following raw materials, measured by weight: 100 parts by weight of vinyl silicone oil, 4 to 8 parts by weight of MQ silicone resin, 5 to 15 parts by weight of hydrogenated silicone oil, 0.5 to 3 parts by weight of hydrogenated silicone resin, 500 to 900 parts by weight of absorbent, 50 to 300 parts by weight of flame retardant, 0.06 to 0.3 parts by weight of catalyst, and 0.02 to 0.1 parts by weight of inhibitor. The low-volatility, low-permeability, voltage-resistant, aging-resistant, flame-retardant absorbing material of the present invention has the advantages of low volatility, low oil permeability, aging resistance, voltage resistance, and flame retardancy.

Description

Technical Field

[0001] The present invention relates to the field of wave-absorbing materials, in particular to a low-volatile, low-permeability oil-resistant, voltage-resistant, aging-resistant and flame-retardant wave-absorbing material and a preparation method thereof. Background Art

[0002] With the advancement of wireless communication technology, electromagnetic interference (EMI) and electromagnetic compatibility (EMC) issues are receiving increasing attention. Absorbers are key materials for addressing these challenges. Absorbers convert incident electromagnetic wave energy into heat through electrical or magnetic loss, thereby reducing or eliminating electromagnetic interference. Typical applications for absorbing materials, such as consumer electronics, wireless Wi-Fi, switches, and optical module communications, require thin sheet-like absorbers due to limited space. These applications require not only excellent absorbing properties but also low volatility, low oil permeability, excellent insulation, high-voltage breakdown resistance, aging resistance, and flame retardancy. Currently, most thin sheet-like absorbers on the market are made from polyurethane or silicone resin systems. These materials exhibit high volatiles, severe oil permeability, poor voltage resistance, poor aging resistance, and poor flame retardancy. This makes them difficult to meet the performance requirements of demanding applications such as optical module communications, aviation, and aerospace.

[0003] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0004] The object of the present invention is to provide a low-volatile, low-penetration oil-resistant, voltage-resistant, aging-resistant, flame-retardant wave-absorbing material, which has the advantages of low volatility, low oil permeation, aging resistance, voltage resistance and flame retardancy.

[0005] To achieve the above objectives, an embodiment of the present invention provides a low-volatility, low-permeability oil-resistant, voltage-resistant, aging-resistant, flame-retardant, and wave-absorbing material, which includes the following raw material components, calculated by mass: 100 parts by mass of vinyl silicone oil, 4 to 8 parts by mass of MQ silicone resin, 5 to 15 parts by mass of hydrogenated silicone oil, 0.5 to 3 parts by mass of hydrogenated silicone resin, 500 to 900 parts by mass of absorbent, 50 to 300 parts by mass of flame retardant, 0.06 to 0.3 parts by mass of catalyst, and 0.02 to 0.1 parts by mass of inhibitor.

[0006] In one or more embodiments of the present invention, the M to Q ratio of the MQ silicone resin is 0.5 to 1.4.

[0007] In one or more embodiments of the present invention, the viscosity of the hydrogen-containing silicone oil is 100 to 5000 mPa·s; the mass of hydrogen groups in the hydrogen-containing silicone oil is 0.05% to 5% of the total mass of the hydrogen-containing silicone oil.

[0008] In one or more embodiments of the present invention, the hydrogenated silicone resin is a hydrogenated MQ silicone resin, wherein the ratio of M to Q is 0.5 to 1.5, and the mass of hydrogen groups in the hydrogenated silicone resin is 0.05% to 1% of the total mass of the hydrogenated silicone resin.

[0009] In one or more embodiments of the present invention, the absorbent is one or more of sendust, iron-silicon, iron-nickel, iron-cobalt, iron-cobalt-nickel, iron-silicon-chromium-molybdenum, carbonyl iron and ferrite; and / or,

[0010] The flame retardant is one or more of magnesium hydroxide, aluminum hydroxide and antimony trioxide, and the average particle size of the flame retardant is 0.5-100 μm.

[0011] In one or more embodiments of the present invention, the inhibitor comprises one of an alkynol compound, an amide compound and a maleate compound; and / or,

[0012] The catalyst comprises a Custer catalyst.

[0013] An embodiment of the invention further provides a method for preparing the above-mentioned low-volatile, low-permeability oil-resistant, voltage-resistant, aging-resistant, flame-retardant, and wave-absorbing material, characterized in that it comprises the following steps:

[0014] S1, vinyl silicone oil and MQ silicone resin are mixed, heated and vacuum stirred to obtain a first premix; hydrogen-containing silicone oil and hydrogen-containing silicone resin are mixed, heated and vacuum stirred to obtain a second premix;

[0015] S2, mixing the first premix, the second premix, the absorbent, the flame retardant, and the inhibitor, and stirring the mixture under water cooling and vacuum to obtain a third premix;

[0016] S3. Add a catalyst to the third premix, cool with water, and stir in a vacuum to obtain the low-volatility, low-permeability, oil-resistant, voltage-resistant, aging-resistant, flame-retardant, and wave-absorbing material.

[0017] In one or more embodiments of the present invention, the vacuum degree of the heating vacuum stirring step in step S1 is -0.05 to -0.1 MPa, the stirring temperature of the heating vacuum stirring is 100 to 180° C., and the stirring time of the heating vacuum stirring is 1 to 8 hours; and / or,

[0018] The vacuum degree of the water-cooled vacuum stirring step in step S2 and step S3 is -0.05 to -0.1 MPa, the stirring temperature of the heated vacuum stirring is 10 to 25° C., and the stirring time of the heated vacuum stirring is 0.5 to 4 hours.

[0019] In one or more embodiments of the present invention, the preparation method further comprises the following steps:

[0020] S4, heating and curing the obtained low-volatility, low-permeability oil-resistant, voltage-resistant, aging-resistant, and flame-retardant absorbing material to obtain a cured and formed absorbing material.

[0021] In one or more embodiments of the present invention, the heating temperature of the heat curing molding process is 100 to 180° C., and the heating time is 8 to 48 hours.

[0022] Compared to the prior art, the low-volatility, low-permeability, oil-resistant, voltage-resistant, and aging-resistant flame-retardant absorber according to the embodiments of the present invention optimizes the absorber's aging resistance and significantly improves the product's mechanical strength by adding MQ silicone resin and hydrogenated silicone resin to the formula. The synergistic effect of the silicone oil and silicone resin in the formula ensures that the product has both low hardness and extremely low oil permeation. Furthermore, a special heat treatment process is used during the preparation process, significantly improving the product's volatility. The introduction of silicone resin and flame retardant increases the viscosity of the entire formulation system, ensuring both flame retardancy and ensuring that the absorber is not easily settled during mixing, allowing it to be evenly dispersed into the silicone oil system, preventing localized sedimentation and forming a conductive network, thereby resistant to voltage breakdown. The synergistic effect of the various components in the entire formulation system and the refinement of the preparation process achieve maximum functional optimization of the product. DETAILED DESCRIPTION

[0023] The specific embodiments of the present invention are described in detail, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0024] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations such as "include" or "comprising", etc., will be understood to include the stated elements or components but not to exclude other elements or other components.

[0025] According to a preferred embodiment of the present invention, a low-volatile, low-permeability oil-resistant, voltage-resistant, aging-resistant, flame-retardant, and wave-absorbing material comprises the following raw material components, calculated in parts by mass: 100 parts by mass of vinyl silicone oil, 4 to 8 parts by mass of MQ silicone resin, 5 to 15 parts by mass of hydrogenated silicone oil, 0.5 to 3 parts by mass of hydrogenated silicone resin, 500 to 900 parts by mass of absorbent, 50 to 300 parts by mass of flame retardant, 0.06 to 0.3 parts by mass of catalyst, and 0.02 to 0.1 parts by mass of inhibitor.

[0026] In one embodiment, the ratio of M to Q of the MQ silicone resin is 0.5 to 1.4.

[0027] In one specific embodiment, the viscosity of the hydrogen-containing silicone oil is 100 to 5000 mPa·s; the mass of hydrogen groups in the hydrogen-containing silicone oil is 0.05% to 5% of the total mass of the hydrogen-containing silicone oil.

[0028] In a specific embodiment, the hydrogenated silicone resin is a hydrogenated MQ silicone resin, wherein the ratio of M to Q is 0.5 to 1.5, and the mass of hydrogen groups in the hydrogenated silicone resin is 0.05% to 1% of the total mass of the hydrogenated silicone resin.

[0029] In a specific embodiment, the absorbent is one or more of sendust, iron-silicon, iron-nickel, iron-cobalt, iron-cobalt-nickel, iron-silicon-chromium-molybdenum, carbonyl iron and ferrite.

[0030] In a specific embodiment, the flame retardant is one or more of magnesium hydroxide, aluminum hydroxide and antimony trioxide, and the average particle size of the flame retardant is 0.5 to 100 μm.

[0031] In one embodiment, the inhibitor comprises an alkynol compound. Specifically, the alkynol compound is at least one of alkynylcyclohexanol, 3,5-dimethyl-1-hexyn-3-ol, 3,6-dimethyl-1-heptyn-3-ol, and 3,7,11-trimethyldodecyn-3-ol.

[0032] In one embodiment, the catalyst comprises a Custer catalyst. Specifically, the Custer catalyst is F60050.

[0033] An embodiment of the invention further provides a method for preparing the above-mentioned low-volatile, low-permeability oil-resistant, voltage-resistant, aging-resistant, flame-retardant, and wave-absorbing material, characterized in that it comprises the following steps:

[0034] S1, vinyl silicone oil and MQ silicone resin are mixed, heated and vacuum stirred to obtain a first premix; hydrogen-containing silicone oil and hydrogen-containing silicone resin are mixed, heated and vacuum stirred to obtain a second premix.

[0035] Specifically, the vacuum degree of the heating vacuum stirring step in step S1 is -0.05 to -0.1 MPa, the stirring temperature of the heating vacuum stirring is 100 to 180° C., and the stirring time of the heating vacuum stirring is 1 to 8 hours.

[0036] S2. The first premix, the second premix, the absorbent, the flame retardant and the inhibitor are mixed, and the mixture is stirred under water cooling and vacuum to obtain a third premix.

[0037] Specifically, the vacuum degree of the water-cooled vacuum stirring step is -0.05 to -0.1 MPa, the stirring temperature of the water-cooled vacuum stirring is 10 to 25° C., and the stirring time of the water-cooled vacuum stirring is 0.5 to 4 hours.

[0038] It can be understood that the purpose of water cooling during water-cooled vacuum stirring is to prevent the third premix from solidifying prematurely.

[0039] S3. Add a catalyst to the third premix, cool with water, and stir in a vacuum to obtain a low-volatile, low-permeability, oil-resistant, voltage-resistant, aging-resistant, flame-retardant, and wave-absorbing material.

[0040] Specifically, the vacuum degree of the water-cooled vacuum stirring step is -0.05 to -0.1 MPa, the stirring temperature of the water-cooled vacuum stirring is 10 to 25° C., and the stirring time of the water-cooled vacuum stirring is 0.5 to 4 hours.

[0041] It can be understood that the role of water cooling in water-cooled vacuum stirring is to prevent the low-volatile, low-permeability, oil-resistant, voltage-resistant, aging-resistant, flame-retardant, and wave-absorbing material from solidifying prematurely.

[0042] In one embodiment, the preparation method further comprises the following steps:

[0043] S4. The obtained low-volatile, low-permeability oil-resistant, voltage-resistant, aging-resistant, and flame-retardant absorbing material is subjected to a heating, curing, and molding process to obtain a cured and molded absorbing material.

[0044] The heating temperature of the heat curing molding process is 100 to 180° C., and the heating time is 8 to 48 hours.

[0045] Specifically, the shape of the absorbing material after curing and forming can be adjusted according to actual needs. For example, the absorbing material after curing and forming can be in the form of a sheet, that is, an absorbing sheet.

[0046] Example 1

[0047] In the first step, vinyl silicone oil and MQ silicone resin are added to a stirring tank, heated and stirred at 150°C for 4 hours, and then taken out and cooled to obtain a first premix; hydrogenated silicone oil and hydrogenated silicone resin are added to another stirring tank, heated and stirred at 150°C for 4 hours, and then taken out and cooled to obtain a second premix;

[0048] In the second step, the treated first premix, second premix, absorbent, flame retardant, and inhibitor are added to a stirring tank, stirred and vacuumed for 2 hours. The outer wall of the stirring tank is cooled with circulating water at a temperature of 18°C ​​and a vacuum degree of -0.09 MPa. After mixing evenly, a third premix is ​​obtained. The catalyst is then added to the third premix, and stirring and vacuuming are continued under the above conditions for 1 hour to obtain the absorbing material of the present invention.

[0049] The third step is to extrude the absorbing material onto a calendering roller for calendering. The calendered material is then heated and cured in an oven with a calendering thickness of 1.0 mm, a curing temperature of 130°C, and a curing time of 20 minutes.

[0050] The fourth step is to peel off the release film on one side of the cured sheet-like absorbing material, place it in a 130°C oven and bake it for 24 hours, then take it out to obtain the absorbing sheet.

[0051] The raw materials and their amounts for the above process are shown in the following table:

[0052]

[0053]

[0054] Example 2

[0055] In the first step, vinyl silicone oil and MQ silicone resin are added to a stirring tank, heated and stirred at 160°C for 5 hours, and then taken out and cooled to obtain a first premix; hydrogenated silicone oil and hydrogenated silicone resin are added to another stirring tank, heated and stirred at 160°C for 5 hours, and then taken out and cooled to obtain a second premix;

[0056] In the second step, the treated first premix, second premix, absorbent, flame retardant, and inhibitor are added to a stirring tank, stirred and vacuumed for 1 hour, and the outer wall of the stirring tank is cooled with circulating water at a temperature of 18°C ​​and a vacuum degree of -0.09 MPa. After mixing evenly, a third premix is ​​obtained, and the catalyst is added to the third premix. Stirring and vacuuming are continued under the above conditions for 1 hour to obtain the absorbing material of the present invention.

[0057] The third step is to extrude the absorbing material onto a calendering roller for calendering. The calendered material is then heated and cured in an oven with a calendering thickness of 1.0 mm, a curing temperature of 130°C, and a curing time of 20 minutes.

[0058] The fourth step is to peel off the release film on one side of the cured sheet-like absorbing material, place it in a 130°C oven and bake it for 24 hours, then take it out to obtain the absorbing sheet.

[0059] The raw materials and their amounts for the above process are shown in the following table:

[0060]

[0061]

[0062] Example 3

[0063] In the first step, vinyl silicone oil and MQ silicone resin are added to a stirring tank, heated and stirred at 170°C for 4 hours, and then taken out and cooled to obtain a first premix; hydrogenated silicone oil and hydrogenated silicone resin are added to another stirring tank, heated and stirred at 170°C for 4 hours, and then taken out and cooled to obtain a second premix;

[0064] In the second step, the treated first premix, second premix, absorbent, flame retardant, and inhibitor are added to a stirring tank, stirred and vacuumed for 2 hours. The outer wall of the stirring tank is cooled with circulating water at a temperature of 18°C ​​and a vacuum degree of -0.09 MPa. After mixing evenly, a third premix is ​​obtained. The catalyst is then added to the third premix, and stirring and vacuuming are continued under the above conditions for 1 hour to obtain the absorbing material of the present invention.

[0065] The third step is to extrude the absorbing material onto a calendering roller for calendering. The calendered material is then heated and cured in an oven with a calendering thickness of 1.0 mm, a curing temperature of 130°C, and a curing time of 20 minutes.

[0066] The fourth step is to peel off the release film on one side of the cured sheet-like absorbing material, place it in a 140°C oven and bake it for 24 hours, then take it out to obtain the absorbing sheet.

[0067] The raw materials and their amounts for the above process are shown in the following table:

[0068]

[0069]

[0070] Example 4

[0071] In the first step, vinyl silicone oil and MQ silicone resin are added to a stirring tank, heated and stirred at 150°C for 4 hours, and then taken out and cooled to obtain a first premix; hydrogenated silicone oil and hydrogenated silicone resin are added to another stirring tank, heated and stirred at 150°C for 4 hours, and then taken out and cooled to obtain a second premix;

[0072] In the second step, the treated first premix, second premix, absorbent, flame retardant, and inhibitor are added to a stirring tank, stirred and vacuumed for 3 hours. The outer wall of the stirring tank is cooled with circulating water at a temperature of 18°C ​​and a vacuum degree of -0.09 MPa. After mixing evenly, a third premix is ​​obtained. The catalyst is then added to the third premix, and stirring and vacuuming are continued under the above conditions for 1 hour to obtain the absorbing material of the present invention.

[0073] The third step is to extrude the absorbing material onto a calendering roller for calendering. The calendered material is then heated and cured in an oven with a calendering thickness of 1.0 mm, a curing temperature of 130°C, and a curing time of 20 minutes.

[0074] The fourth step is to peel off the release film on one side of the cured sheet-like absorbing material, place it in a 150°C oven and bake it for 24 hours, then take it out to obtain the absorbing sheet.

[0075] The raw materials and their amounts for the above process are shown in the following table:

[0076]

[0077] Comparative Example 1

[0078] In the first step, vinyl silicone oil and MQ silicone resin are added to a stirring tank, heated and stirred at 150°C for 4 hours, and then taken out and cooled to obtain a first premix; hydrogenated silicone oil and hydrogenated silicone resin are added to another stirring tank, heated and stirred at 150°C for 4 hours, and then taken out and cooled to obtain a second premix;

[0079] In the second step, the treated first premix, second premix, absorbent, flame retardant, and inhibitor are added to a stirring tank, stirred and vacuumed for 2 hours. The outer wall of the stirring tank is cooled with circulating water at a temperature of 18°C ​​and a vacuum degree of -0.09 MPa. After mixing evenly, a third premix is ​​obtained. The catalyst is then added to the third premix, and stirring and vacuuming are continued under the above conditions for 1 hour to obtain the absorbing material of the present invention.

[0080] The third step is to extrude the absorbing material onto a calendering roller for calendering. The calendered material is then heated and cured in an oven with a calendering thickness of 1.0 mm, a curing temperature of 130°C, and a curing time of 20 minutes.

[0081] The fourth step is to peel off the release film on one side of the cured sheet-like absorbing material, place it in a 130°C oven and bake it for 2 hours, and then take it out to obtain the absorbing sheet.

[0082] The raw materials and their amounts for the above process are shown in the following table:

[0083]

[0084] Comparative Example 2

[0085] In the first step, vinyl silicone oil is added to a stirring tank and heated and stirred at 150°C for 4 hours, then taken out and cooled to obtain a first premix; hydrogenated silicone oil and hydrogenated silicone resin are added to another stirring tank and heated and stirred at 150°C for 4 hours, then taken out and cooled to obtain a second premix;

[0086] In the second step, the treated first premix, second premix, absorbent, flame retardant, and inhibitor are added to a stirring tank, stirred and vacuumed for 2 hours. The outer wall of the stirring tank is cooled with circulating water at a temperature of 18°C ​​and a vacuum degree of -0.09 MPa. After mixing evenly, a third premix is ​​obtained. The catalyst is then added to the third premix, and stirring and vacuuming are continued under the above conditions for 1 hour to obtain the absorbing material of the present invention.

[0087] The third step is to extrude the absorbing material onto a calendering roller for calendering. The calendered material is then heated and cured in an oven with a calendering thickness of 1.0 mm, a curing temperature of 130°C, and a curing time of 20 minutes.

[0088] The fourth step is to peel off the release film on one side of the cured sheet-like absorbing material, place it in a 130°C oven and bake it for 24 hours, then take it out to obtain the absorbing sheet.

[0089] The raw materials and their amounts for the above process are shown in the following table:

[0090]

[0091] Comparative Example 3

[0092] Coolzorb600 absorbers sold by Laird.

[0093] The absorbing sheets of Examples 1 to 4 and Comparative Examples 1 to 3 were subjected to the following performance tests:

[0094] (1) Oil leakage test. Cut the cured absorbing film into 10mm*10mm*1mm square samples and place them on coordinate paper. Finally, put the samples together with the coordinate paper into an oven at 125℃ for 336 hours and observe the size of the oil leakage.

[0095] (2) Volatility test. Cut the cured absorbing film into 10mm*10mm*1mm square samples, place the samples in a 10ml glass bottle, cover the bottle mouth with a glass sheet, and then place the glass bottle on a 100℃ heating table. After heating for 1000h, observe the volatility.

[0096] (3) Tensile strength test: Use a mechanical testing machine to test the tensile strength in accordance with the corresponding standard.

[0097] (4) Voltage resistance test. Cut the cured absorbing film into 10mm*10mm*1mm square samples and place them on an aluminum plate. Use a digital megohmmeter with the voltage set to 1000V. One end is in contact with the sample surface and the other end is in contact with the aluminum plate. Test the voltage resistance of the sample (test time 10s).

[0098] (5) Hardness test: According to the requirements of the standard, the cured absorbing film is stacked into a standard thickness and tested using a Shore 00 hardness tester.

[0099] (6) Aging performance test: Prepare an absorber with a size of 100mm*100mm*1.0mm, and then place it in a 125℃ oven to carry out a hot air aging test for 1000h.

[0100] (7) Flame retardant performance test: Refer to UL94 test method for testing.

[0101] The test performance of the absorbers prepared in Examples 1-4 above is shown in the following table.

[0102]

[0103]

[0104] It can be seen that the absorbers prepared by this scheme, Examples 1 to 4, after the 1000h volatilization test, no obvious volatiles were observed, and the oil leakage size after the oil leakage test was no more than 2mm, and the performance was better than that of the competing products. The heat treatment time after high temperature of the absorber prepared in Comparative Example 1 was shorter than that in Example 1, which may result in incomplete removal of volatile components in the product, resulting in the presence of volatilization. In Comparative Example 2, the oil leakage size was 3mm after the oil leakage test, because the oil leakage performance was poor compared to Example 1 because MQ silicone resin was not added to this comparative example. After the aging test, the hardness of the samples in Examples 1 to 4 and Comparative Examples 1 to 2 changed by no more than 10%, while the hardness of the competing product in Comparative Example 3 increased significantly, indicating that the competing product was further cross-linked at high temperature, which is not conducive to the use of the product, and the aging resistance is poor. In addition, the competing product also has poor oil leakage and breakdown voltage resistance.

[0105] In summary, the preparation of low-volatile, low-permeability oil-resistant, voltage-resistant, aging-resistant, flame-retardant absorbers organically combines the formula and process to maximize the realization of high-performance products. Moreover, the preparation process is simple and the preparation process is convenient and fast, which is very suitable for many applications with high requirements for product performance.

[0106] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A low volatility, low permeability oil, voltage resistant, aging resistant, flame retardant and wave absorbing material, characterized in that: The raw material components are as follows: 100 parts by mass of vinyl silicone oil, 4-8 parts by mass of MQ silicone resin, 5-15 parts by mass of hydrogenated silicone oil, 0.5-3 parts by mass of hydrogenated silicone resin, 500-900 parts by mass of absorbent, 50-300 parts by mass of flame retardant, 0.06-0.3 parts by mass of catalyst, and 0.02-0.1 parts by mass of inhibitor; The method for preparing the low-volatility, low-permeability oil, voltage-resistant, aging-resistant, flame-retardant, and wave-absorbing material comprises the following steps: S1, vinyl silicone oil and MQ silicone resin are mixed, heated and vacuum stirred to obtain a first premix; hydrogen-containing silicone oil and hydrogen-containing silicone resin are mixed, heated and vacuum stirred to obtain a second premix; S2, mixing the first premix, the second premix, the absorbent, the flame retardant, and the inhibitor, and stirring the mixture under water cooling and vacuum to obtain a third premix; S3, adding a catalyst to the third premix, cooling with water and stirring in a vacuum to obtain an intermediate product; S4, heating and curing the obtained intermediate product to obtain a cured product; S5. Place the cured product in an oven at 130° C., 140° C., or 150° C. and bake for 24 hours, then take it out to obtain a low-volatile, low-permeability, oil-resistant, voltage-resistant, aging-resistant, flame-retardant, and wave-absorbing material.

2. The low volatility, low permeability oil, voltage-resistant, aging-resistant, flame-retardant, and wave-absorbing material according to claim 1, characterized in that: The M to Q ratio of the MQ silicone resin is 0.5 to 1.

4.

3. The low volatility, low permeability oil, voltage-resistant, aging-resistant, flame-retardant, and wave-absorbing material according to claim 1, characterized in that: The viscosity of the hydrogen-containing silicone oil is 100-5000 mPa·s; the mass of the hydrogen groups in the hydrogen-containing silicone oil is 0.05%-5% of the total mass of the hydrogen-containing silicone oil.

4. The low volatility and low permeability oil-resistant voltage-resistant and aging-resistant flame-retardant absorbing material according to claim 1, characterized in that: The hydrogen-containing silicone resin is a hydrogen-containing MQ silicone resin, wherein the ratio of M to Q is 0.5-1.5, and the mass of hydrogen groups in the hydrogen-containing silicone resin is 0.05%-1% of the total mass of the hydrogen-containing silicone resin.

5. The low volatility and low permeability oil-resistant voltage-resistant and aging-resistant flame-retardant absorbing material according to claim 1, characterized in that: The absorbent is one or more of sendust, iron-silicon, iron-nickel, iron-cobalt, iron-cobalt-nickel, iron-silicon-chromium-molybdenum, carbonyl iron and ferrite; and / or, The flame retardant is one or more of magnesium hydroxide, aluminum hydroxide and antimony trioxide, and the average particle size of the flame retardant is 0.5-100 μm.

6. The low volatility and low permeability oil-resistant voltage-resistant and aging-resistant flame-retardant absorbing material according to claim 1, characterized in that: The inhibitor comprises one of an acetylenic alcohol compound, an amide compound and a maleate compound; and / or, The catalyst comprises a Custer catalyst.

7. The low volatility and low permeability oil-resistant voltage-resistant and aging-resistant flame-retardant absorbing material according to claim 1, characterized in that: The vacuum degree of the heating vacuum stirring step in step S1 is -0.05 to -0.1 MPa, the stirring temperature of the heating vacuum stirring is 100 to 180° C., and the stirring time of the heating vacuum stirring is 1 to 8 hours; and / or, The vacuum degree of the water-cooled vacuum stirring step in step S2 and step S3 is -0.05 to -0.1 MPa, the stirring temperature of the water-cooled vacuum stirring is 10 to 25° C., and the stirring time of the water-cooled vacuum stirring is 0.5 to 4 h.

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