CN109640568B - Novel sealing ring with noise reduction and wave absorption functions and preparation method thereof - Google Patents
Novel sealing ring with noise reduction and wave absorption functions and preparation method thereof Download PDFInfo
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- CN109640568B CN109640568B CN201811452807.3A CN201811452807A CN109640568B CN 109640568 B CN109640568 B CN 109640568B CN 201811452807 A CN201811452807 A CN 201811452807A CN 109640568 B CN109640568 B CN 109640568B
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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
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/06—Hermetically-sealed casings
- H05K5/061—Hermetically-sealed casings sealed by a gasket held between a removable cover and a body, e.g. O-ring, packing
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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
- H05K9/0007—Casings
- H05K9/0015—Gaskets or seals
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
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Abstract
A novel sealing ring with noise reduction and wave absorption functions comprises a rubber layer, an electromagnetic wave absorption layer and a foam layer. The novel sealing ring with the noise reduction and wave absorption functions has a reasonable structure, and the composite soft magnetic alloy material has high magnetic conductivity, so that redundant electromagnetic waves in equipment can be absorbed, and the corresponding noise reduction function can be realized; the foam layer can improve the waterproof and dustproof performance of the sealing ring and can resist shock and vibration; the rubber layer has strong sealing performance and good insulating property. Therefore, the sealing ring can play a role in reducing noise and absorbing waves on the basis of meeting the basic waterproof and dustproof requirements.
Description
Technical Field
The invention belongs to the technical field of assistance of electronic equipment devices, and relates to a novel sealing ring with noise reduction and wave absorption functions and a preparation method thereof.
Background
In recent years, with the continuous development of electronic technology, various electronic devices represented by smart phones have developed, and the miniaturization and thinning of the electronic devices are also being progressed while the high performance requirements are being satisfied. Therefore, high integration inside the device has been further advanced, and higher demands have been made for noise reduction, and it is necessary for the device to have an effective noise suppression effect and also to suppress radiation generated by unexpected or unnecessary noise.
In the production process of 3C product, equipment usually needs to have certain waterproof, dustproof performance, so all can add the sealing washer at the easy position of intaking of equipment or dust, for example: mic hole, earphone hole, side key cap, Sim trompil, Mirco-USB etc. of smart mobile phone.
However, the waterproof and dustproof sealing rings of the prior art have low magnetic permeability and no noise reduction function, and can also affect the use of the devices.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects of the prior art, the invention aims to provide a novel sealing ring with the noise reduction and wave absorption functions and a method for preparing the novel sealing ring with the noise reduction and wave absorption functions.
The technical scheme is as follows: the invention provides a novel sealing ring with noise reduction and wave absorption functions, which consists of a rubber layer, an electromagnetic wave absorption layer and a foam layer. The novel sealing ring with the noise reduction and wave absorption functions has a reasonable structure, and the composite soft magnetic alloy material has high magnetic conductivity, so that redundant electromagnetic waves in equipment can be absorbed, and the corresponding noise reduction function can be realized; the foam layer can improve the waterproof and dustproof performance of the sealing ring and can resist shock and vibration; the rubber layer has strong sealing performance and good insulating property. Therefore, the sealing ring can play a role in reducing noise and absorbing waves on the basis of meeting the basic waterproof and dustproof requirements.
Furthermore, according to the novel sealing ring with the noise reduction and wave absorption functions, the electromagnetic wave absorption layer comprises the composite soft magnetic alloy, carbonyl iron powder and polyurethane resin, and the molar ratio of the composite soft magnetic alloy to the carbonyl iron powder to the polyurethane resin is 1-5: 0.1-0.3: 6-10. The electromagnetic wave absorbing layer has reasonable components, the composite soft magnetic alloy is uniformly distributed in the polyurethane resin, and a proper amount of carbonyl iron powder is doped when the composite soft magnetic alloy is mixed with the polyurethane resin, so that the wave absorbing performance of the composite soft magnetic alloy can be effectively improved.
Furthermore, the novel sealing ring with the noise reduction and wave absorption functions has the molar ratio of the composite soft magnetic alloy, the carbonyl iron powder and the polyurethane resin being 1:0.1: 9. In a preferred embodiment of the present invention, the electromagnetic wave absorption layer has the best effect at the above-mentioned composition.
Further, in the above novel seal ring with noise reduction and wave absorption functions, the composite soft magnetic alloy includes Fe-Si alloy, FeNi permalloy, Sendust alloy, fesiccr iron silicon chromium alloy, FeCuB alloy, FeCuSiBCo alloy, FeCuBNi ni alloy, FeCuSiBCV alloy. The composite soft magnetic alloy can be selected according to requirements, belongs to a magnetic loss type absorbent, absorbs electromagnetic noise by means of attenuation of magnetic hysteresis loss, eddy current loss, residual loss and other polarization mechanisms, and has the characteristics of strong absorption, good effect, thin thickness, wide working frequency band, light weight, high bonding strength and the like.
Furthermore, the rubber layer is made of silicon rubber, so that the novel sealing ring with the noise reduction and wave absorption functions has the excellent characteristics of wide temperature adaptation, strong sealing property, good insulating property and the like, can be suitable for different working environments in electronic products, and is popular due to the low VOC content of the silicon rubber.
Furthermore, foretell have and fall the novel sealing washer of ripples function of inhaling of making an uproar, the cotton layer of bubble for adopting the foaming of PU polyurethane to make of the cotton layer of bubble, it has high waterproof and dustproof performance, has good compression performance and compliance simultaneously, can satisfy its requirement to taking precautions against earthquakes, antidetonation, and secondly low VOC more is of value to environmental protection and health.
The invention also discloses a preparation method of the novel sealing ring with the noise-reducing and wave-absorbing functions, which comprises the following steps: and embedding and combining the rubber layer, the electromagnetic wave absorption layer and the foam layer, and then carrying out high-temperature hot pressing at 140-160 ℃ and 10-20 MPa for 10-30 s, and curing to obtain the novel sealing ring with the noise reduction and wave absorption functions. The preparation method of the novel sealing ring with the noise-reducing and wave-absorbing functions is simple in preparation process and beneficial to large-scale production.
Further, the preparation method of the novel sealing ring with the noise reduction and wave absorption functions comprises the following steps: the preparation method of the electromagnetic wave absorption layer comprises the following steps: and (3) uniformly mixing and stirring the composite soft magnetic alloy, carbonyl iron powder and polyurethane resin in a high-temperature kneading machine, adding into a mold, and curing and molding in the mold at 120-180 ℃ for 3-6 hours to obtain the electromagnetic wave absorption layer. The high-temperature kneader is uniform in mixing and stirring, mild in condition and easy to realize.
The technical scheme shows that the invention has the following beneficial effects: the novel sealing ring with the noise reduction and wave absorption functions can meet the requirements of equipment on water resistance and dust prevention after being applied to electronic equipment, and meanwhile, the electromagnetic wave absorption layer absorbs redundant electromagnetic wave interference at the arrangement position to achieve the noise reduction function.
Drawings
Fig. 1-2 is a schematic structural diagram of the novel sealing ring with noise reduction and wave absorption functions according to the invention;
in the figure: 1 rubber layer, 2 electromagnetic wave absorbing layers and 3 foam layers.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example 1
The novel sealing ring with the noise-reducing and wave-absorbing functions as shown in fig. 1-2 is composed of a rubber layer 1, an electromagnetic wave absorbing layer 2 and a foam layer 3. The electromagnetic wave absorption layer 2 comprises a composite soft magnetic alloy, carbonyl iron powder and polyurethane resin, and the molar ratio of the composite soft magnetic alloy to the carbonyl iron powder to the polyurethane resin is 1:0.1: 6.
In this embodiment, rubber layer 1 adopts the silicon rubber to make, compound soft magnetic alloy is FeSiCr iron silicon chromium alloy, just foam layer 3 adopts the foam layer that PU polyurethane foam made.
The preparation method of the novel sealing ring with the noise-reducing and wave-absorbing functions comprises the following steps:
the rubber layer 1, the electromagnetic wave absorption layer 2 and the foam layer 3 are respectively and independently prepared, wherein the preparation method of the electromagnetic wave absorption layer 2 comprises the following steps: and (2) uniformly mixing and stirring the composite soft magnetic alloy, carbonyl iron powder and polyurethane resin in a high-temperature kneading machine, adding into a mold, and curing and molding in the mold for 3 hours at 120 ℃ to obtain the electromagnetic wave absorption layer 2.
And embedding and combining the rubber layer 1, the electromagnetic wave absorption layer 2 and the foam layer 3, and then carrying out high-temperature hot pressing at 140 ℃ and 10MPa for 10s, and curing to obtain the novel sealing ring with the noise-reducing and wave-absorbing functions.
Example 2
The novel sealing ring with the noise-reducing and wave-absorbing functions as shown in fig. 1-2 is composed of a rubber layer 1, an electromagnetic wave absorbing layer 2 and a foam layer 3. The electromagnetic wave absorption layer 2 comprises a composite soft magnetic alloy, carbonyl iron powder and polyurethane resin, and the molar ratio of the composite soft magnetic alloy to the carbonyl iron powder to the polyurethane resin is 5: 0.3: 10.
In this embodiment, rubber layer 1 adopts silicon rubber to make, compound soft magnetic alloy is FeCuSiBCV alloy, just foam layer 3 adopts the foam layer that PU polyurethane foam made.
The preparation method of the novel sealing ring with the noise-reducing and wave-absorbing functions comprises the following steps:
the rubber layer 1, the electromagnetic wave absorption layer 2 and the foam layer 3 are respectively and independently prepared, wherein the preparation method of the electromagnetic wave absorption layer 2 comprises the following steps: and (2) uniformly mixing and stirring the composite soft magnetic alloy, carbonyl iron powder and polyurethane resin in a high-temperature kneading machine, adding into a mold, and curing and molding in the mold for 6 hours at 180 ℃ to obtain the electromagnetic wave absorption layer 2.
And embedding and combining the rubber layer 1, the electromagnetic wave absorption layer 2 and the foam layer 3, and then carrying out high-temperature hot pressing at 160 ℃ and 20MPa for 30s to obtain the novel sealing ring with the noise-reducing and wave-absorbing functions after curing.
Example 3
The novel sealing ring with the noise-reducing and wave-absorbing functions as shown in fig. 1-2 is composed of a rubber layer 1, an electromagnetic wave absorbing layer 2 and a foam layer 3. The electromagnetic wave absorption layer 2 comprises a composite soft magnetic alloy, carbonyl iron powder and polyurethane resin, and the molar ratio of the composite soft magnetic alloy to the carbonyl iron powder to the polyurethane resin is 1:0.1: 9.
In this embodiment, the rubber layer 1 is made of silicone rubber, the composite soft magnetic alloy is Sendust alloy, and the foam layer 3 is a foam layer made of PU polyurethane foam.
The preparation method of the novel sealing ring with the noise-reducing and wave-absorbing functions comprises the following steps:
the rubber layer 1, the electromagnetic wave absorption layer 2 and the foam layer 3 are respectively and independently prepared, wherein the preparation method of the electromagnetic wave absorption layer 2 comprises the following steps: and (2) uniformly mixing and stirring the composite soft magnetic alloy, carbonyl iron powder and polyurethane resin in a high-temperature kneading machine, adding into a mold, and curing and molding in the mold for 4 hours at 150 ℃ to obtain the electromagnetic wave absorption layer 2.
And embedding and combining the rubber layer 1, the electromagnetic wave absorption layer 2 and the foam layer 3, and then carrying out high-temperature hot pressing at 150 ℃ and 18MPa for 20s to obtain the novel sealing ring with the noise-reducing and wave-absorbing functions after curing.
Example 4
The novel sealing ring with the noise-reducing and wave-absorbing functions as shown in fig. 1-2 is composed of a rubber layer 1, an electromagnetic wave absorbing layer 2 and a foam layer 3. The electromagnetic wave absorption layer 2 comprises a composite soft magnetic alloy, carbonyl iron powder and polyurethane resin, and the molar ratio of the composite soft magnetic alloy to the carbonyl iron powder to the polyurethane resin is 1:0.2: 10.
In this embodiment, the rubber layer 1 is made of silicon rubber, the composite soft magnetic alloy is Fe-Si alloy, and the foam layer 3 is a foam layer made of PU polyurethane foam.
The preparation method of the novel sealing ring with the noise-reducing and wave-absorbing functions comprises the following steps:
the rubber layer 1, the electromagnetic wave absorption layer 2 and the foam layer 3 are respectively and independently prepared, wherein the preparation method of the electromagnetic wave absorption layer 2 comprises the following steps: and (2) uniformly mixing and stirring the composite soft magnetic alloy, carbonyl iron powder and polyurethane resin in a high-temperature kneading machine, adding into a mold, and curing and molding in the mold for 3-6 hours at 120 ℃ to obtain the electromagnetic wave absorption layer 2.
And embedding and combining the rubber layer 1, the electromagnetic wave absorption layer 2 and the foam layer 3, and carrying out high-temperature hot pressing at 160 ℃ and 15MPa for 30s to obtain the novel sealing ring with the noise-reducing and wave-absorbing functions after curing.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (7)
1. The utility model provides a novel sealing washer with it inhale ripples function to fall makes an uproar which characterized in that: consists of a rubber layer (1), an electromagnetic wave absorption layer (2) and a foam layer (3);
the preparation method of the novel sealing ring with the noise-reducing and wave-absorbing functions comprises the following steps: the rubber layer (1), the electromagnetic wave absorption layer (2) and the foam layer (3) are combined in an embedded mode, then hot pressing is carried out for 10-30 s at the high temperature of 140-160 ℃ and the high temperature of 10-20 MPa, and the novel sealing ring with the noise reduction and wave absorption functions is obtained after solidification.
2. The novel sealing ring with noise reduction and wave absorption functions as claimed in claim 1, is characterized in that: the electromagnetic wave absorption layer (2) comprises a composite soft magnetic alloy, carbonyl iron powder and polyurethane resin, wherein the molar ratio of the composite soft magnetic alloy to the carbonyl iron powder to the polyurethane resin is 1-5: 0.1-0.3: 6-10.
3. The novel sealing ring with noise reduction and wave absorption functions as claimed in claim 2, is characterized in that: the molar ratio of the composite soft magnetic alloy to the carbonyl iron powder to the polyurethane resin is 1:0.1: 9.
4. The novel sealing ring with noise reduction and wave absorption functions as claimed in any one of claims 1 to 3, is characterized in that: the composite soft magnetic alloy comprises Fe-Si alloy, FeNi permalloy, Sendust alloy, FeSiCr iron silicon chromium alloy, FeCuB alloy, FeCuSiBCo alloy, FeCuBNi alloy and FeCuSiBCV alloy.
5. The novel sealing ring with noise reduction and wave absorption functions as claimed in claim 1, is characterized in that: the rubber layer (1) is made of silicon rubber.
6. The novel sealing ring with noise reduction and wave absorption functions as claimed in claim 1, is characterized in that: the foam layer (3) is a foam layer made of PU polyurethane foam.
7. The novel sealing ring with noise reduction and wave absorption functions as claimed in claim 1, is characterized in that: the method comprises the following steps: the preparation method of the electromagnetic wave absorption layer (2) comprises the following steps: and (3) uniformly mixing and stirring the composite soft magnetic alloy, carbonyl iron powder and polyurethane resin in a high-temperature kneading machine, adding into a mold, and curing and molding in the mold at 120-180 ℃ for 3-6 h to obtain the electromagnetic wave absorption layer (2).
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| CN201811452807.3A CN109640568B (en) | 2018-11-30 | 2018-11-30 | Novel sealing ring with noise reduction and wave absorption functions and preparation method thereof |
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| CN201811452807.3A CN109640568B (en) | 2018-11-30 | 2018-11-30 | Novel sealing ring with noise reduction and wave absorption functions and preparation method thereof |
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| CN109640568B true CN109640568B (en) | 2020-07-07 |
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| CN110933540A (en) * | 2019-12-09 | 2020-03-27 | 西安鼎蓝通信技术有限公司 | Noise reduction sealing ring suitable for sound equipment and preparation method thereof |
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| JP2007053269A (en) * | 2005-08-19 | 2007-03-01 | Denki Kagaku Kogyo Kk | Electromagnetic wave absorber and its manufacturing method |
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