CN113004698B - Electromagnetic shielding rubber and preparation method thereof - Google Patents
Electromagnetic shielding rubber and preparation method thereof Download PDFInfo
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- CN113004698B CN113004698B CN201911318025.5A CN201911318025A CN113004698B CN 113004698 B CN113004698 B CN 113004698B CN 201911318025 A CN201911318025 A CN 201911318025A CN 113004698 B CN113004698 B CN 113004698B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0083—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0806—Silver
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Abstract
The invention relates to an electromagnetic shielding rubber and a preparation method thereof. The electromagnetic shielding rubber is prepared from the following raw materials in parts by weight: 100 parts of matrix rubber, 5-15 parts of modifier, 250-300 parts of shielding agent and 1-10 parts of vulcanizing agent; the shielding agent comprises magnetic metal powder subjected to sheet-shaped treatment, metal-plated fiber and silver powder or silver-plated powder. The electromagnetic shielding rubber has excellent electromagnetic shielding performance and conductivity, is suitable for the field of aerospace and aviation electronics (shielding materials are required to have shielding effectiveness of more than 60 dB), and is good in sealing performance and mechanical property, low in density and low in cost.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to electromagnetic shielding rubber and a preparation method thereof.
Background
With the rapid development and wide application of electronics, computers and telecommunications technologies, the spatial electromagnetic environment becomes increasingly complex. Various electronic instruments, communication equipment and computers can generate electromagnetic waves to influence the normal operation of other equipment, and can be interfered by external electromagnetic waves, so that the potential hazard to important systems such as precision instruments, aerospace engineering, navigation equipment, scientific measurement, medical health-care equipment and the like is huge. In addition, the electromagnetic interference can affect the operation and the operation of the tip weapon, and the communication command system can also cause a great obstacle due to the electromagnetic interference.
The electromagnetic shielding rubber is a functional rubber material which is prepared by mixing and processing rubber as a base material and conductive filler as a shielding agent, is used as a shielding sealing element in through holes or gaps of shielding bodies of electronic equipment and systems, and prevents electromagnetic waves from leaking from the gaps, so that the electromagnetic compatibility, the inherent elasticity of the rubber and the water vapor sealing function of the whole equipment or system are guaranteed, and the electromagnetic shielding rubber is widely applied to sealing systems of electronic and electrical equipment such as aerospace, ships, naval vessels, combat vehicles, workstations, computers, data communication, medical treatment, household appliances and the like.
The commonly used shielding agents mainly comprise carbon materials such as carbon black, graphite and carbon nano tubes, and metal powder materials such as gold, silver and nickel. However, the carbon-based material has poor dispersibility in the matrix, and the obtained shielding material has insufficient conductivity and shielding property; the metal powder material usually needs to be added in a large amount in a matrix to form a stable conductive path, has the problems of high cost, high density and poor mechanical property, and does not accord with the development trend of light weight and low cost of shielding materials.
Disclosure of Invention
Based on this, there is a need to provide an electromagnetic shielding rubber. The electromagnetic shielding rubber has excellent electromagnetic shielding performance and conductivity, is suitable for the field of aerospace and aviation electronics (shielding materials are required to have shielding effectiveness of more than 60 dB), and is good in sealing performance and mechanical property, low in density and low in cost.
The electromagnetic shielding rubber is prepared from the following raw materials in parts by weight:
the shielding agent comprises magnetic metal powder subjected to sheet-shaped treatment, metal-plated fiber and silver powder or silver-plated powder.
In one embodiment, the electromagnetic shielding rubber is prepared from the following raw materials in parts by weight:
in one embodiment, the magnetic metal powder is selected from at least one of carbonyl iron powder, iron-cobalt alloy powder, iron-silicon-aluminum alloy powder, and iron-silicon-chromium alloy powder.
In one embodiment, the method of sheet processing comprises the steps of:
and mixing the magnetic metal powder and the silica sol coating solution, and performing sheet-shaped treatment on the magnetic metal powder in a ball milling manner to form sheet-shaped magnetic metal powder.
In one embodiment, the metal-plated fibers are silver-plated glass fibers or nickel-plated carbon fibers.
In one embodiment, the weight ratio of the magnetic metal powder subjected to flake processing, the metal-plated fiber and the silver powder or silver-plated powder in the shielding agent is 8-12: 2 to 4:1.
in one embodiment, the base rubber is a methyl vinyl silicone rubber.
In one embodiment, the modifier is selected from at least one of ethylene acrylic rubber (AEM), linear Low Density Polyethylene (LLDPE), and Ethylene Vinyl Acetate (EVA).
In one embodiment, the electromagnetic shielding rubber further comprises 10-20 parts of white carbon black.
In one embodiment, the white carbon black is fumed silica, and the particle size is 450-550 nm.
In one embodiment, the electromagnetic shielding rubber further comprises 1-5 parts of hydroxyl silicone oil.
The invention also provides a preparation method of the electromagnetic shielding rubber, which comprises the following steps:
mixing the rest raw materials except the vulcanizing agent and the modifier, and carrying out heat treatment on the obtained rubber compound; and adding a vulcanizing agent and a modifier into the heat-treated rubber compound, mixing and vulcanizing.
In one embodiment, the temperature of the vulcanization is 165-170 ℃ and the time is 10-20 min.
Compared with the prior art, the invention has the following beneficial effects:
the shielding agent of the electromagnetic shielding rubber is compounded by adopting the magnetic metal powder subjected to sheet-shaped treatment, the metal-plated fiber and the silver powder or silver-plated powder, and the shielding agent, the magnetic metal powder, the metal-plated fiber and the silver powder or silver-plated powder are cooperated with each other to construct a perfect conductive network path and can carry out multi-path shielding such as absorption, reflection and the like on electromagnetic waves. Meanwhile, the modifier is adopted to modify the matrix rubber, and the weight parts of the raw material components are reasonably prepared, so that the mechanical property of the material can be further improved, the shielding agent can be dispersed in the material, a micro network passage can be formed, and the excellent electromagnetic shielding property of the material can be exerted. The electromagnetic shielding rubber prepared by reasonable formula design has the advantages of low cost, low density, excellent electromagnetic shielding performance and electric conductivity, good sealing performance and mechanical performance, capability of meeting the requirements of aerospace and electronic equipment, and great application value.
Detailed Description
The electromagnetic shielding rubber and the preparation method thereof according to the present invention will be described in further detail with reference to specific examples.
The embodiment of the invention provides electromagnetic shielding rubber which is prepared from the following raw materials in parts by weight:
the shielding agent comprises magnetic metal powder subjected to sheet-shaped treatment, metal-plated fibers and silver powder or silver-plated powder.
In the research process, the inventor finds that the magnetic metal powder has the advantages of high magnetic conductivity and high use frequency after sheet processing, but the electric conductivity is poor, so the electromagnetic shielding performance is limited, and the mechanical property is poor. The silver powder and the silver plating powder have the advantages of high conductivity, good electromagnetic shielding effect and low volume resistivity, but the silver powder and the silver plating powder have high density, and the comprehensive mechanical property of the electromagnetic shielding rubber is reduced due to the addition of a small amount of the silver powder and the silver plating powder.
Based on the above, the shielding agent of the electromagnetic shielding rubber is compounded by adopting the shielding agent comprising magnetic metal powder subjected to sheet-shaped treatment, metal-plated fibers and silver powder or silver-plated powder. In the electromagnetic shielding rubber, the silver powder or the silver-plated powder has excellent electric conduction and chemical stability, and is mixed with the flaky processed magnetic metal powder with higher magnetic conductivity to ensure that the surface of the flaky processed magnetic metal powder is attached with silver or silver-plated metal particles/thin films, so that the electric conduction and the chemical stability of the powder can be further improved, and the characteristics of high magnetic conductivity and low surface density of the flaky magnetic metal powder can be maintained. In the invention, the shielding agent is also compounded with metal-plated fibers, so that the reflection attenuation performance of the material can be improved, and the metal-plated fibers can be oriented and arranged in the matrix rubber, so that the electromagnetic shielding performance and the mechanical property of the rubber material are further enhanced. Meanwhile, the modifier is adopted to modify the matrix rubber, and the weight parts of the raw material components are reasonably prepared, so that the mechanical property of the material can be further improved, the shielding agent can be favorably dispersed in the material, a microscopic network passage can be formed, and the excellent electromagnetic shielding property of the material can be exerted. In the formula design of the invention, the raw material components are cooperated with each other, so that the prepared electromagnetic shielding rubber has excellent electromagnetic shielding performance and electric conductivity, and meanwhile, the prepared electromagnetic shielding rubber has good sealing performance and mechanical property, small density and low cost.
In some specific embodiments, the electricity isThe density of the magnetic shielding rubber is less than 3.5g/cm 3 The volume resistivity is less than 0.012 omega cm, and the shielding effectiveness of the whole frequency band of 200kHz-10GHz can reach more than 80 dB. More specifically, when the weight ratio of the shielding agent in the electromagnetic shielding rubber is 70%, the volume resistivity can be at least 0.01 omega cm, and the shielding effectiveness of the whole frequency band of 200kHz-10GHz can be more than 90 dB.
Preferably, the electromagnetic shielding rubber is prepared from the following raw materials in parts by weight:
in the preferable range, especially the amount of the modifier is preferable, so that the electromagnetic shielding effect of the electromagnetic shielding rubber can be effectively improved while the mechanical property of the electromagnetic shielding rubber is not obviously reduced, and the density is lower.
Preferably, the magnetic metal powder is selected from carbonyl iron powder or iron alloy powder, and the iron alloy powder may be at least one of iron-cobalt alloy powder, iron-silicon-aluminum alloy powder and iron-silicon-chromium alloy powder. The magnetic metal powder can further improve the electromagnetic shielding effect, and has lower density and better mechanical property.
In one specific embodiment, the method of sheet processing comprises the steps of:
and mixing the magnetic metal powder and the silica sol coating solution, and performing sheet-shaped treatment on the magnetic metal powder in a ball milling manner to form sheet-shaped magnetic metal powder.
More specifically, the magnetic metal powder can be prepared by an atomization method, the particle shape of the alloy metal powder (iron-cobalt alloy powder, iron-silicon-aluminum alloy powder or iron-silicon-chromium alloy powder) prepared by the atomization method is generally irregular or spherical, carbonyl iron powder is spherical, and the whole particle size is about 6-10 μm; the coating material in the silica sol coating solution can be Cr 2 O 3 ZnO or tetraethyl orthosilicate with the dosage of 0.5-2 percent of the mass of the magnetic metal powder(ii) a Ethanol can be used as a process control agent in the ball milling process, the ball milling beads can be zirconium beads, the ball-to-material ratio can be controlled to be 10-20, the ball milling rotating speed can be 300-400 r/min, and the ball milling time can be 6-12 h.
In one specific embodiment, the metal-plated fibers are silver-plated glass fibers or nickel-plated carbon fibers.
In one specific embodiment, the preparation method of the metal-plated fiber comprises the following steps:
(1) Placing glass fiber or carbon fiber in an alkali solution for ultrasonic treatment;
(2) Soaking with sodium thiosulfate;
(3) Neutralizing acid on the surface of the glass fiber or the carbon fiber with an alkali solution, and then carrying out ultrasonic sensitization;
(4) And carrying out chemical plating.
In one specific embodiment, the silver plating powder is copper silver plating or aluminum silver plating powder. The silver powder or silver-plated powder can be used as micro-lapping particles, and can reduce the overall resistivity of the material. The particle size of the silver powder or silver plating powder can be about 10-30 microns.
Preferably, the weight ratio of the magnetic metal powder subjected to flake processing, the metal-plated fiber and the silver powder or silver-plated powder in the shielding agent is 8-12: 2 to 4:1. the three shielding agents are compounded according to the weight ratio, so that the low integral surface density and the excellent electromagnetic shielding effect can be considered, and the mechanical property is more excellent.
In one specific embodiment, the base rubber is a methyl vinyl silicone rubber.
Preferably, the modifier is selected from at least one of ethylene acrylic rubber (AEM), linear Low Density Polyethylene (LLDPE), and ethylene-vinyl acetate copolymer (EVA).
The prepared electromagnetic shielding rubber has good sealing property and high and low temperature resistance by taking the methyl vinyl silicone rubber as the base rubber, but the mechanical property is not ideal, especially after the shielding agent is added. Through further research, at least one of ethylene acrylic rubber (AEM), linear Low Density Polyethylene (LLDPE) and ethylene-vinyl acetate copolymer (EVA) is used as a modifier, so that the methyl vinyl silicone rubber can be subjected to blending reinforcement, the mechanical property of the prepared electromagnetic shielding rubber is improved, the density is lower, and meanwhile, the dispersion of the electromagnetic shielding material is facilitated, and a better electromagnetic shielding effect is exerted.
Preferably, the vulcanizing agent is a peroxide vulcanizing agent. The vulcanizing agent releases low-molecular acidic substances in the vulcanizing process, has small influence on the electrical property of the electromagnetic shielding rubber, and can keep the overall resistivity of the material at a low level. In particular, the peroxide curative may be bis 25, DCP or BIPB.
By combining the modifier type and the proper weight part ratio thereof, and the vulcanizing agent and the proper weight part ratio thereof, the maximum torque of vulcanizing the matrix rubber can be increased, the vulcanizing time is prolonged, the vulcanizing efficiency is improved, the network crosslinking density of the material is improved, and the comprehensive mechanical property of the electromagnetic shielding rubber is further improved.
Further, in one specific embodiment, the electromagnetic shielding rubber further includes 10 to 20 parts of white carbon black. The white carbon black is added, so that the matrix rubber can be further reinforced, and the open mill operation is facilitated. More specifically, the white carbon black is fumed silica, and the particle size is 450-550 nm.
In one specific embodiment, the electromagnetic shielding rubber further comprises 1-5 parts of hydroxyl silicone oil. The hydroxyl silicone oil is added, so that physical adsorption and chemical combination of the matrix rubber to the shielding agent can be inhibited, the purpose of preventing the sizing material from being structured is achieved, and the storage period of the sizing material is prolonged.
The preparation method of the electromagnetic shielding rubber comprises the following steps:
mixing the rest raw materials except the vulcanizing agent and the modifier, and carrying out heat treatment on the obtained rubber compound; and adding a vulcanizing agent and a modifier into the heat-treated rubber compound, mixing and vulcanizing.
In one specific embodiment, the temperature of the heat treatment is 140-160 ℃ and the time is 3-5 h. The heat treatment of the rubber compound under the temperature condition has the advantages of effectively combining the surface of the hydroxyl silicone oil and the surface of the white carbon black and eliminating low-molecular volatile matters in the silica gel.
In one specific embodiment, the temperature of the vulcanization is 165-170 ℃ and the time is 10-20 min. The vulcanization time and the vulcanization temperature are reasonably controlled, the vulcanization degree of the material can be improved, the mechanical property of the electromagnetic shielding material is ensured, meanwhile, along with the improvement of the vulcanization degree, the conductivity of the material is also improved, and the thermo-oxidative-electric stability is enhanced.
The following are specific examples, and the raw materials used in the examples are all commercially available products unless otherwise specified.
In the examples, the method for preparing the magnetic metal powder (FCIP, feSiAl, feCo) by the sheet treatment was as follows:
(1) Selecting corresponding magnetic metal powder prepared by an atomization method, wherein the particle size is about 6-10 mu m;
(2) Adopting a planetary ball mill to carry out flat treatment on the magnetic metal powder: the ball milling beads are zirconium beads, the ball material ratio is 15, and the silica sol coating solution (the coating substance can be Cr selected from the following substances) is weighed according to 1 percent of the mass of the magnetic metal powder 2 O 3 ) The process control agent is ethanol, the rotating speed is 350r/min, and the mechanical ball milling time is 8h.
(3) After the ball milling is finished, washing the flaky magnetic metal powder by using absolute ethyl alcohol, and then drying in vacuum.
The preparation method of the adopted metal-plated fiber comprises the following steps:
(1) Preparing 45g/L sodium hydroxide aqueous solution, placing corresponding glass fiber or carbon fiber in the solution, and treating with an ultrasonic stirrer at 30 deg.C for 20min;
(2) Soaking the fiber treated in the step (1) in 200g/L ammonium thiosulfate aqueous solution at the temperature of 30 ℃ for 50min; then neutralizing residual acid on the surface of the fiber by using 10wt% of sodium hydroxide aqueous solution, and carrying out ultrasonic sensitization treatment for 10min in 20g/L stannous chloride aqueous solution;
(3) Putting the fiber treated in the step (2) into NiSO of 30g/L 4 ·6H 2 O aqueous solution or 1g/L AgNO 3 The solution is maintained at 50 ℃ in an aqueous solution and a proper amount of ammonia water, and chemical plating is started and ultrasonic stirring is carried out for 40min.
The raw material components of the electromagnetic shielding rubbers of examples 1 to 4 and comparative examples 1 to 4 are shown in the following table 1 (parts by weight):
TABLE 1
Note: FCIP refers to flaky carbonyl iron powder and CIP refers to carbonyl iron powder.
The preparation methods of the electromagnetic shielding rubbers of examples 1 to 4 and comparative examples 1 to 4 were as follows:
(1) Plasticating methyl vinyl silicone rubber on an open mill, adding white carbon black, hydroxyl silicone oil and shielding filler to prepare rubber compound, and performing heat treatment for 4 hours in an electrothermal blowing dry box at 150 ℃;
(2) Remilling the rubber compound after the heat treatment in the step (1), adding a modifier, uniformly mixing on an open mill, adding a vulcanizing agent, uniformly mixing, and then discharging; standing for 24h, and vulcanizing on a flat vulcanizing machine at 165-170 deg.C for 15min.
The electromagnetic shielding rubbers of examples 1 to 4 and comparative examples 1 to 4 were subjected to performance test:
(1) The magnetic metal powder in the form of flake or non-flake used in example 1 and comparative example 4 was subjected to microwave electromagnetic parameter measurement:
the determination method comprises the following steps: heating the prepared flaky magnetic metal powder (example 1) or magnetic metal powder without flaky treatment (comparative example 1) and paraffin according to a mass ratio of 80 to 20 in an oven at 50-60 ℃, then quickly taking out, mixing and stirring uniformly, preparing a viscous solid, filling the viscous solid into a coaxial ring mold (the outer diameter of the mold is 7mm, and the inner diameter of the mold is 3.04 mm), respectively preparing samples with the thickness of 1-2mm, and then testing the microwave electromagnetic parameters of the samples in a frequency range of 1-18 GHz by using a network vector analyzer. The results are shown in table 2 below.
TABLE 2
| Electromagnetic parameters | CIP | FCIP |
| ε′(2GHz) | 38.72 | 23.21 |
| μ′(2GHz) | 3.58 | 4.91 |
As can be seen from table 2, the magnetic metal powder FCIP after sheet-like treatment has a lower real part of dielectric constant and a higher real part of magnetic permeability than the magnetic metal powder CIP without sheet-like treatment, which is more conducive to absorption of electromagnetic waves, and requires three kinds of shielding fillers to act synergistically in order to obtain a good shielding effect.
(2) Comprehensive performance test of the electromagnetic shielding rubbers of examples 1 to 4 and comparative examples 1 to 4:
the test method comprises the following steps:
the shielding properties of the material were tested by an EMC chamber according to standard SJ 20524-1995. The sample size was 120 mm. Times.120 mm. Times.2 mm. And (3) testing environmental conditions: the temperature is 22.5 ℃; humidity: 45% (RH). The flange coaxial method is adopted, and the test frequency range is 200KHz-10 GHz.
The volume resistivity was measured according to GB/T2439-2001. The length of the test sample is 10cm, the thickness is 2-3 mm, and the width is 1cm.
The mechanical properties were tested according to GBT 528-2009.
The test results are shown in table 3 below:
TABLE 3
It can be known from examples 1 to 4 that the electromagnetic shielding rubber with good shielding performance, good conductivity, small density and good mechanical properties can be prepared by compounding the shielding agent of the magnetic metal powder, the metal fiber and the silver powder or the silver powder which are processed in a flake shape as the shielding agent and reasonably controlling the proportion of the raw material components.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. The electromagnetic shielding rubber is characterized by being prepared from the following raw materials in parts by weight:
100 portions of matrix rubber,
5 to 15 portions of modifier,
250 to 300 parts of shielding agent, and
1 to 10 parts of vulcanizing agent;
wherein the base rubber is methyl vinyl silicone rubber;
the modifier is selected from at least one of ethylene acrylic rubber, linear low-density polyethylene and ethylene-vinyl acetate copolymer;
the shielding agent comprises magnetic metal powder subjected to sheet-shaped treatment, metal-plated fibers and silver powder or silver-plated powder; the weight ratio of the magnetic metal powder subjected to sheet processing to the metal-plated fiber to the silver powder or silver-plated powder is (8) - (12): 2 to 4:1;
the magnetic metal powder is selected from at least one of carbonyl iron powder, iron-cobalt alloy powder, iron-silicon-aluminum alloy powder and iron-silicon-chromium alloy powder;
the method for sheet processing comprises the following steps: and mixing the magnetic metal powder and the silica sol coating solution, and performing sheet-shaped treatment on the magnetic metal powder in a ball milling manner to form sheet-shaped magnetic metal powder.
2. The electromagnetic shielding rubber according to claim 1, which is prepared from the following raw materials in parts by weight:
100 portions of matrix rubber,
8 to 12 parts of modifier,
260 to 280 parts of shielding agent, and
1 to 5 portions of vulcanizing agent.
3. The electromagnetic shielding rubber according to claim 1, wherein the metal-plated fiber is silver-plated glass fiber or nickel-plated carbon fiber.
4. The electromagnetic shielding rubber according to claim 1, wherein the vulcanizing agent is a peroxide vulcanizing agent.
5. The electromagnetic shielding rubber according to any one of claims 1 to 4, further comprising: 10 to 20 parts of white carbon black; and 1 to 5 parts of hydroxyl silicone oil.
6. The electromagnetic shielding rubber according to claim 5, wherein the white carbon black is fumed silica, and the particle size is 450-550 nm.
7. The method for preparing an electromagnetic shielding rubber according to any one of claims 1 to 6, comprising the steps of:
mixing the rest raw materials except the vulcanizing agent and the modifier, and carrying out heat treatment on the obtained rubber compound; adding a vulcanizing agent and a modifier into the heat-treated rubber compound, mixing and vulcanizing.
8. The method for preparing the electromagnetic shielding rubber according to claim 7, wherein the vulcanization temperature is 165 to 170 ℃ and the time is 10 to 20min.
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| CN114231034A (en) * | 2021-11-26 | 2022-03-25 | 迁安益昌电子材料有限公司 | Novel formula of magnetic shielding silicone rubber |
| CN115011006B (en) * | 2022-06-09 | 2024-04-02 | 北京新橡高分子材料有限公司 | L-band wave-absorbing oil-resistant rubber sheet and preparation method thereof |
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