CN108055818A - Anti- galvanic corrosion is electromagnetically shielded seal trim strip - Google Patents
Anti- galvanic corrosion is electromagnetically shielded seal trim strip Download PDFInfo
- Publication number
- CN108055818A CN108055818A CN201711024181.1A CN201711024181A CN108055818A CN 108055818 A CN108055818 A CN 108055818A CN 201711024181 A CN201711024181 A CN 201711024181A CN 108055818 A CN108055818 A CN 108055818A
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- China
- Prior art keywords
- rubber strip
- cabinet
- strip
- conductive rubber
- middle level
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Classifications
-
- 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
- H05K9/0016—Gaskets or seals having a spring contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/003—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor characterised by the choice of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
-
- 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
-
- 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
Abstract
The present invention proposes a kind of anti-galvanic corrosion electromagnetic shielding seal trim strip.It can solve the problems, such as to be only capable of realizing the Practical Project of cabinet, cabinet Electromagnetic Shield on Electronic Equipments without being avoided that galvanic corrosion with the compound closed shield pad of single conductive rubber strip using single conductive rubber pad and single rubber bodies using the present invention.The present invention is achieved by following methods：It is electromagnetically shielded sandwich of the seal trim strip by outer layer insulation rubber strip (1) → middle level conductive rubber strip (2) ← primary insulation rubber strip (3) composite molding one, wherein, middle level conductive rubber strip (2) is pressed from both sides in the form of dome to be connected between the groove that outer layer insulation rubber strip (1) and primary insulation rubber strip (3) are formed, middle level conductive rubber strip (2) realizes cabinet, the electromagnetic shielding of cabinet electronic equipment metallic matrix contact, outer layer insulation rubber strip (1) and primary insulation rubber strip (3) realize cabinet with the dome item of middle level conductive rubber strip (2) and its elastic extruded channels of formation, itself water vapor seal of cabinet electronic equipment metallic matrix contact.
Description
Technical field
The present invention relates to a kind of electromagnetic shielding seal trim strips for being mainly used for cabinet, cabinet electronic equipment
Background technology
For a long time, the large scale electronic equipments such as cabinet, cabinet, mostly to be kneaded the standby machine of the rubber system of silver powder or aluminium silvering powder
Case, cabinet electronic equipment form electromagnetic armouring structure between the single conductive rubber pad of generally use and cabinet lid door.Due to cabinet,
Cabinet electronic equipment volume is big, the presence of ventilation and heat structure, and complete machine water vapor seal is poor or even blow-by.In natural environment
The electrolyte that has been formed when having adsorbed sulfur dioxide, nitrogen dioxide, nitrogen, carbon dioxide, salt fog etc. of steam, direct invasion, leaching
Wet, immersion is using the formation of single conductive rubber pad and cabinet, the electromagnetic armouring structure of rack room, due to the silver in conductive rubber pad
Flour gold belongs to and cabinet, cabinet alloy matrix aluminum are there are potential difference, and electrochemical reaction occurs at electromagnetic armouring structure contact interface, leads
Send a telegraph the cabinet in magnet shielding structure as anode, cabinet alloy matrix aluminum is corroded, and (i.e. the galvanic couple of different metal compatibility is rotten
Erosion), in turn result in cabinet, cabinet electronic equipment electromagnetic shielding failure, anti-electromagnetic interference capability decline, seriously affect cabinet,
The Electro Magnetic Compatibility of cabinet electronic equipment, electronic device environment adaptability significantly reduce.Aluminum Alloy Chassis, cabinet are rotten simultaneously
Serious local corrosion has occurred in erosion, alloy, and surface has deep etch pit and wide and long corrosion cracking.Due to electronic
The anti-galvanic corrosion poor-performing of equipment, and maintenance difficult is dismounted, seriously affect equipment guarantee performance and used life, economy damage
It loses serious.
In actual damp and hot and salt fog extreme climate environment, the influence factor of galvanic corrosion includes the influence of galvanic series, ring
The influence of the influence, area effect, galvanic couple of border factor to spacing etc..Cabinet, the cabinet electricity of this single conductive rubber pad realization
Sub- installation electromagnetical shielding construction, in corrosive medium environment, due to cabinet, the light metal alloy standard electrode potential of cabinet use
Very low, chemism is high, and surface can not be formed with protective oxide-film.When being contacted with other metals, it often makees
For anode by galvanic corrosion.Galvanic corrosion can also lure in addition to accelerating the corrosion failure of light metal alloy anode member
Corrosion failure more dangerous in the engineerings such as spot corrosion, crevice corrosion is sent out, results in cabinet, cabinet galvanic corrosion and capability of electromagnetic shielding
The quality accident of failure takes place frequently, and economic loss is serious, it has also become industry engineering challenge urgently to be resolved hurrily.
In nature, the condition generally existing of electrochemical reaction occurs, therefore, galvanic corrosion has generality.To most
For number galvanic corrosion, corrosion electrolyte, which is primarily referred to as condensing upon, contains some impurity (chloride, sulfate on material surface
Deng) moisture film or solution.Corrosion electrolyte must continuously be present between different materials, and the ion for forming corrosion cell is led
Electric branch.Light metal is one of most active metal in metal galvanic series, is always filled when Al alloys andMg alloys are connected with other metals
When active anode is corroded at first.In practical applications, due to the requirement of mechanical structure and its electric conductivity, metal parts
Between contact directly and can not avoid completely.Galvanic corrosion is actually one kind of macrocorrosion battery, and electricity occurs between metal
Chemical reaction, generation galvanic corrosion should be with following three primary conditions, one, and there are enough current potentials of different corrosion potentials
Difference, under I classes good environment (indoor environment, outdoor masking environment), potential difference is more than that 0.25V galvanic corrosions also will substantially be sent out
Raw, Galvanic Current increases with the increase of potential difference.Potential difference between light metal alloy and the metal coupled with it is bigger, gently
Metal alloy is as the more easy accelerated corrosion of anode；Two, corrosion electrolyte must continuously be present between different materials,
It contacts directly or is connected by other conductors；Three, the material with the presence of electrolyte and there are different corrosion potentials.Namely
It says, as long as lacking any of the above conditions, electrochemical reaction does not occur, and galvanic corrosion would not occur.
In Electromagnetic Shield on Electronic Equipments engineering design, due to being subject to the composite factors such as material, technique, structure, function
It limits, conductive gasket must be contacted with cabinet, cabinet metallic matrix in electromagnetic armouring structure, and conductive gasket uses more
It is poor that rubber mixes the standard electrode potential that silver powder or aluminium silvering powder are kneaded between sulfidization molding, with cabinet, cabinet alloy matrix aluminum
Up to 2.47V, far above standard conditions of the difference in Electrode Potential that galvanic corrosion occurs for above-mentioned I classes good environment more than 0.25V.Cause
This, prevent electrochemical reaction generation electrolyte existing for necessary condition be to prevent cabinet, cabinet Electromagnetic Shield on Electronic Equipments knot
Galvanic corrosion occurs for structure, the ability for improving electromagnetic armouring structure anti-galvanic corrosion in itself be solve the above problems most directly,
One of the most effective ways.
To solve Electromagnetic Shield on Electronic Equipments structure in salt mist environment, corrosive medium, galvanic couple occurs for different metal contact
Corrosion, the engineering challenge of environmental suitability difference, engineering specialists devise multiple technologies scheme.Wherein, microwave/
In millimetre-wave circuit component, the technical solution of high-frequency circuit protection is taken into account, mostly with spies such as low temperature brazing, Laser Welding or parallel seam weldings
Kind welding encapsulation technology, realizes hermetic seal and the composite protective of electromagnetic shielding.This technical solution quality there are complex process
The shortcomings that control is difficult, maintainability is poor or can not repair, is only applicable to the miniaturized electronic devices such as microwave/millimeter wave circuit unit
Electromagnetic shielding and weather environmental protection.
In the 1990s, for electronic equipment anti-adverse environment general requirement, relevant criterion is proposed " when using a kind of
When sealing element cannot meet airtight (watertight) and two kinds of functions of electromagnetic shielding simultaneously, water vapor seal and electromagnetic shielding should respectively into
Row, water vapor seal body should be arranged on outer layer, and electromagnetic armouring structure body should be arranged on internal layer, and fastener is arranged on outermost layer " it is close
Envelope property design requirement.But the solution that this water vapor seal and electromagnetic shielding are implemented respectively, then it is big there is volume is occupied, it is real
The Practical Project problem of dress property difference.On this basis, it is to adapt to electronics miniaturization and lightweight requirements, outside steam is close
Electromagnetic shield Integrated manufacture composite integrated on the inside of Feng Tihe, formed a kind of water vapor seal that can realize electronic equipment and
The electromagnetic leakage of electronic equipment is occurred " closed shield pad " that energy plays attenuation.It is this to possess compact-sized, dimension
" the closed shield pad " that repairing property is good, real equipment is good, applied to non-tight cabinet, cabinet electromagnetic armouring structure in when, be located at
Electromagnetic shielding on the inside of cabinet, cabinet know from experience be subject to from cabinet, interior of equipment cabinet electrolyte infiltrated, soaked, impregnated, will also lead
Send a telegraph the galvanic corrosion of magnet shielding structure.Therefore, this " closed shield pad " is only capable of solving the small electricals such as permanent seal module
The water vapor seal of sub- equipment and electromagnetic shielding environmental suitability problem, it is impossible to solve non-tight cabinet, the electricity of cabinet electronic equipment
Magnetic screen and environmental suitability problem.
The content of the invention
To meet cabinet, cabinet electronic equipment Electro Magnetic Compatibility and environmental suitability requirement, the purpose of the present invention is be directed to
It can not achieve conductive rubber pad water vapor seal existing for the single conductive rubber pad of the prior art, closed shield pad and cause machine
The shortcoming of galvanic corrosion occurs for electromagnetic armouring structure in case, cabinet electronic equipment, and it is strong to provide a kind of resistance to corrosion, electromagnetism
Shield effectiveness is high, and compact-sized small, the reliability high life is long, itself can realize that the anti-galvanic couple of conductive rubber cushion water vapor seal is rotten
Erosion electromagnetic shielding seal trim strip, to solve the cabinet, the cabinet electronics that come using single conductive rubber pad or closed shield cushioning strip
The generality engineering problem of galvanic corrosion existing for installation electromagnetical shielding construction.
To achieve the above object, it is provided by the invention it is a kind of prepare anti-galvanic corrosion electromagnetic shielding seal trim strip, including with
Cabinet, the electromagnetic shielding seal trim strip of cabinet metallic matrix contact, it is characterised in that：The electromagnetic shielding seal trim strip is by outer
The sandwich of 1 → middle level of layer electro-insulating rubber item, 2 ← primary insulation of conductive rubber strip rubber strip, 3 composite molding one, wherein, in
Layer conductive rubber strip 2 press from both sides in the form of dome be connected in the formation of outer layer insulation rubber strip 1 and primary insulation rubber strip 3 groove it
Between, middle level conductive rubber strip 2 realizes cabinet, the electromagnetic shielding of cabinet electronic equipment metallic matrix contact, outer layer insulation rubber strip 1
Cabinet, cabinet are realized with the elastic extruded channels of the dome item and its formation of primary insulation rubber strip 3 and middle level conductive rubber strip 2
Itself water vapor seal of electronic equipment metallic matrix contact.
A kind of method for the electromagnetic shielding seal trim strip for preparing above-mentioned anti-galvanic corrosion, has following technical characteristic：First
Using high conductivity silver powder or aluminium silvering powder intermediate alloy and rubber mix, by conductivity≤3 Ω/m, insulation resistance >=300M
The control intermediate alloy ingredient of Ω demands and the addition of silicon rubber are kneaded conductive rubber, and semi-solid preparation pre-molding is kneaded conductive rubber
Glue；Secondly, by above-mentioned preforming semi-solid preparation conductive rubber strip be placed on the composite molding die upper mold 6 of composite molding die with
In the raised line model of composite molding die lower die 7；Finally, 50 DEG C~60 DEG C, 0.5 it is small when~1.0 it is small when under the conditions of, semi-solid preparation
Conductive rubber strip, will in the composite molding die upper mold 6 of composite molding die and the raised line model of composite molding die lower die 7
Outer layer insulation rubber strip 1, middle level conductive rubber strip 2 and 3 compression moulding of primary insulation rubber strip one.
Present invention conductive rubber pad single compared with the prior art and " closed shield pad " have the advantages that：
1 resistance to corrosion is strong, and electromagnet shield effect is high.The present invention uses insulation resistance >=1 He of 300M Ω outer layer insulations rubber strip
Primary insulation rubber strip 3, realizes the water vapor seal to conductivity≤3 Ω/m middle levels conductive rubber strip 2, good insulation preformance, hydrophobic
Property good, performance stablize.The conductive rubber of rubber and matrix homogeneity compounding rubber silver powder or the low-resistivity of aluminium silvering powder is combined into
Type one forms the electromagnetic screen of 1 → middle level of outer layer insulation rubber strip, 2 ← primary insulation of conductive rubber strip rubber strip, 3 sandwich
Seal trim strip is covered, reduces the active site on 2 alloy corrosion surface of middle level conductive rubber strip.
2 realize cabinet, the electromagnetic shielding of cabinet electronic equipment, and outer layer insulation rubber strip 1 and primary insulation rubber strip 3 are realized
Be electromagnetically shielded middle level conductive rubber strip 2 water vapor seal of itself in seal trim strip, prevented middle level conductive rubber strip 2 and cabinet,
The presence of cabinet metallic matrix contact site electrolyte, and then prevent cabinet, cabinet Electromagnetic Shield on Electronic Equipments structure galvanic couple
The generation of corrosion.In cabinet, cabinet Electromagnetic Shield on Electronic Equipments in electromagnetic shielding seal trim strip realization, by controlling two outer layers
25%~30% decrement of outer layer insulation rubber strip 1 and primary insulation rubber strip 3 realizes the water to middle level conductive rubber strip 2
Steam packing has prevented electromagnetic shielding seal trim strip interlayer middle level conductive rubber strip 2 and cabinet, cabinet metallic matrix 4,5 electromagnetism
Electroless liquid exists at shield gasket, lacks electrochemical reaction between middle level conductive rubber strip 2 and cabinet, cabinet metallic matrix 4,5
" electrolyte presence " necessary condition occurred, so as between interlayer middle level conductive rubber strip 2 and cabinet, cabinet metallic matrix 4,5
Galvanic corrosion do not occur, resistance to corrosion is strong；Seal trim strip interlayer middle level conductive rubber strip 2 is electromagnetically shielded by controlling
20%~25% decrement, middle level conductive rubber strip 2 and cabinet, the electrical contact of cabinet metallic matrix 4,5 are good, electromagnetic shielding
Efficiency >=60dB (frequency≤10GHz), electromagnet shield effect is high, ensure that cabinet, the high shield effectiveness of cabinet electronic equipment is wanted
It asks.Solve cabinet, cabinet electronic equipment electromagnetism that the prior art is come using single conductive rubber pad or closed shield cushioning strip
The generality engineering problem of galvanic corrosion existing for shielding construction.
3 is compact-sized small, and the reliability high life is long.The present invention is using good insulation preformance, hydrophobicity is good, performance is stablized
Rubber and matrix homogeneity compounding rubber silver powder or aluminium silvering powder low-resistivity conductive rubber composite molding one, formed outer
The electromagnetic shielding seal trim strip of 1 → middle level of layer electro-insulating rubber item, 2 ← primary insulation of conductive rubber strip rubber strip, 3 sandwich.By
It is identical with the rubber matrix of outer layer insulation rubber strip 1 and primary insulation rubber strip 3 in middle level conductive rubber strip 2, after composite molding
The rubber matrix of outer layer insulation rubber strip 1, middle level conductive rubber strip and primary insulation rubber strip 3 integrally combines, exhausted with outer layer
The technical characteristic of 1 → middle level of edge rubber strip, 2 ← primary insulation of conductive rubber strip rubber strip, 3 sandwich composite molding one, it is whole
Body lear energy is strong, and this rubber extensibility is high, modulus is low, and performance is stablized, can be long-term at a temperature of -60 DEG C~180 DEG C
Work 15 years or more, the reliability high life is long.It can be used safely under the conditions of salt air corrosion, disclosure satisfy that cabinet, cabinet electronics
Installation electromagnetical compatibility, protective, maintainability, reliability, real equipment and cost-effectivenes.
The present invention is suitable for the room atmosphere of the different metal compatibility of metallic matrix contact, control humidity variation；It is indoor
Air, humidity do not control；Outdoor weather, rural atmosphere；Outdoor weather, industry/coastal atmospheric environment；Weather in vessel cabin, sea
The electromagnetic shielding liner of foreign atmospheric environment, the particularly sealing of cabinet, the electromagnetic shielding of cabinet electronic equipment and environmental protection are used
Electromagnetic shielding liner.
Description of the drawings
Fig. 1 is the structure form schematic diagram of the anti-galvanic corrosion electromagnetic shielding seal trim strip of the present invention.
Fig. 2 is the sectional view of Fig. 1.
Fig. 3 is the sectional view for the electromagnetic shielding embodiment that the present invention is contacted in cabinet, cabinet metallic matrix.
Fig. 4 is present invention electromagnetic shielding seal trim strip composite molding die compression molding sectional view.
Fig. 5 is Fig. 4 composite molding die exploded views.
Fig. 6 is composite molding die upper mold bottom view.
Fig. 7 is composite molding die lower die top view.
In figure：1 outer layer insulation rubber strip, 2 middle level conductive rubber strips, 3 primary insulation rubber strips, 4 cabinets, cabinet door, 5 machines
Case, cabinet, 6 composite molding die upper molds, 7 composite molding die lower dies, 8 guide pins.
Specific embodiment
Refering to Fig. 1~Fig. 2.In embodiment described below, a kind of anti-galvanic corrosion electromagnetic shielding liner, by outer
Layer electro-insulating rubber item 1, middle level conductive rubber strip 2, primary insulation rubber strip 3 form, it has 1 → middle level of outer layer insulation rubber strip
2 ← primary insulation of conductive rubber strip rubber strip, 3 sandwich, wherein, middle level conductive rubber strip 2 is pressed from both sides in the form of dome to be connected in outside
Between the groove that layer electro-insulating rubber item 1 and primary insulation rubber strip 3 are formed, middle level conductive rubber strip 2 realizes cabinet, cabinet electronics
The electromagnetic shielding of equipment metallic matrix contact, outer layer insulation rubber strip 1 and primary insulation rubber strip 3 and middle level conductive rubber strip 2
Dome item and its formation elastic extruded channels realize cabinet, cabinet electronic equipment metallic matrix contact itself steam it is close
Envelope.
Refering to Fig. 3~Fig. 7.First using high conductivity silver powder or aluminium silvering powder intermediate alloy and rubber mix, by conduction
The control intermediate alloy ingredient of rate≤3 Ω/m demands and the addition of silicon rubber are kneaded conductive rubber, and semi-solid preparation pre-molding mixes
Refine conductive rubber strip.Meanwhile electro-insulating rubber is kneaded by the control raw rubber ingredient of insulation resistance >=300M Ω demands, semi-solid preparation is pre-
Molded mixing electro-insulating rubber item；Secondly, by 1 → middle level of outer layer insulation rubber strip, 2 ← primary insulation of conductive rubber strip rubber strip 3
Above-mentioned preforming semi-solid preparation conductive rubber strip and semi-solid preparation electro-insulating rubber item are placed on composite molding die by sandwich form
Composite molding die upper mold 6 and composite molding die lower die 7 raised line model in, then closed by the positioning of guide pin 8 compound
Molding die upper mold 6；
Finally, 50 DEG C~60 DEG C, 0.5 it is small when~1.0 it is small when under the conditions of, vulcanize in composite molding die, semi-solid preparation conduction rubber
Adhesive tape and semi-solid preparation electro-insulating rubber item are in the composite molding die upper mold 6 of composite molding die and composite molding die lower die 7
In raised line model, by outer layer insulation rubber strip 1, middle level conductive rubber strip 2 and 3 compression moulding of primary insulation rubber strip one, shape
" mountain peak " being connected between outer layer insulation rubber strip 1 and primary insulation rubber strip 3 is pressed from both sides in the form of dome into middle level conductive rubber strip 2
Shape is electromagnetically shielded seal trim strip.
Intermediate alloy can add in Rare-Earth Ce, by conductivity≤3 using aluminium silvering powder as matrix alloy in the form of aluminium silvering powder
It is conductive with rubber mix to prepare aluminium silvering powder-Ce intermediate alloys for the addition of Ω/m demand modeling intermediate alloy Ce ingredients
Rubber.
Rare-Earth Ce can reduce the physical dimension of α and β phases in aluminium silvering powder alloy, and crystal grain thinning promotes alloying element closing
Being uniformly distributed in gold reduces harmful element and the content and the porosity that are mingled with, and under the comprehensive function of above-mentioned factor, alloy is rotten
The potential difference lost between each phase in surface reduces, and the active site of corrosion surface is reduced, and makes the corrosion resistance of aluminium silvering powder alloy itself
It can be improved.
In embodiment described below, for the control of 2 decrement of middle level conductive rubber strip in 20%~25% scope, outer layer is exhausted
Edge rubber strip 1 and the control of 3 decrement of primary insulation rubber strip are in 25%~30% scope.
Anti- galvanic corrosion electromagnetic shielding seal trim strip is installed on the electromagnetism in cabinet, cabinet Electromagnetic Shield on Electronic Equipments structure
2 decrement of middle level conductive rubber strip of shield gasket press strip is controlled in 20%~25% scope, outer layer insulation rubber strip 1 and internal layer
3 decrement of electro-insulating rubber item is controlled in 25%~30% scope.
Above-described is only the preferred embodiment of the present invention.It should be pointed out that come for those of ordinary skill in the art
It says, without departing from the principle of the present invention, several modifications and improvements can also be made.
Claims (4)
1. seal trim strip is electromagnetically shielded in a kind of anti-galvanic corrosion, including the electromagnetic shielding contacted with cabinet, cabinet metallic matrix
Pad, it is characterised in that：The electromagnetic shielding seal trim strip is by outer layer insulation rubber strip (1) → middle level conductive rubber strip (2)
The sandwich of ← primary insulation rubber strip (3) composite molding one, wherein, middle level conductive rubber strip (2) is in the form of dome
Folder is connected between the groove that outer layer insulation rubber strip (1) and primary insulation rubber strip (3) are formed, and middle level conductive rubber strip (2) is real
Existing cabinet, the electromagnetic shielding of cabinet electronic equipment metallic matrix contact, outer layer insulation rubber strip (1) and primary insulation rubber strip
(3) cabinet, cabinet electronic equipment metal are realized with the dome item of middle level conductive rubber strip (2) and its elastic extruded channels of formation
Itself water vapor seal of substrate contact.
2. a kind of preparation method of galvanic corrosion electromagnetic shielding seal trim strip anti-according to claim 1, has following technology
Feature：First using high conductivity silver powder or aluminium silvering powder intermediate alloy and rubber mix, by the control of conductivity≤3 Ω/m demands
The addition of intermediate alloy ingredient and silicon rubber processed is kneaded conductive rubber, and semi-solid preparation pre-molding is kneaded conductive rubber strip；Meanwhile
Electro-insulating rubber is kneaded by the control raw rubber ingredient of insulation resistance >=300M Ω demands, semi-solid preparation pre-molding is kneaded electro-insulating rubber
Item；It secondly, will be above-mentioned pre- by outer layer insulation rubber strip → middle level conductive rubber strip ← primary insulation rubber strip sandwich form
Shaping semi-solid preparation conductive rubber strip and semi-solid preparation electro-insulating rubber item are placed on the composite molding die upper mold (6) of composite molding die
With in the raised line model of composite molding die lower die (7)；Finally, 50 DEG C~60 DEG C, 0.5 it is small when~1.0 it is small when under the conditions of, half
Curing conductive rubber strip and semi-solid preparation electro-insulating rubber item are in the composite molding die upper mold (6) of composite molding die and composite molding
In the raised line model of lower mould (7), by outer layer insulation rubber strip (1), middle level conductive rubber strip (2) and primary insulation rubber strip
(3) compression moulding one.
3. anti-galvanic corrosion electromagnetic shielding seal trim strip method according to claim 2, which is characterized in that intermediate alloy with
Aluminium silvering powder is matrix alloy, Rare-Earth Ce is added in the form of aluminium silvering powder, by conductivity≤3 Ω/m demand modeling intermediate alloys Ce
The addition of ingredient prepares aluminium silvering powder-Ce intermediate alloys and rubber mix conductive rubber.
4. anti-galvanic corrosion electromagnetic shielding seal trim strip method according to claim 2, which is characterized in that middle level conduction rubber
Adhesive tape (2) decrement is controlled in 20%~25% scope, outer layer insulation rubber strip (1) and primary insulation rubber strip (3) decrement
Control is in 25%~30% scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711024181.1A CN108055818A (en) | 2017-10-27 | 2017-10-27 | Anti- galvanic corrosion is electromagnetically shielded seal trim strip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711024181.1A CN108055818A (en) | 2017-10-27 | 2017-10-27 | Anti- galvanic corrosion is electromagnetically shielded seal trim strip |
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| CN108055818A true CN108055818A (en) | 2018-05-18 |
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ID=62119474
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|---|---|---|---|
| CN201711024181.1A Pending CN108055818A (en) | 2017-10-27 | 2017-10-27 | Anti- galvanic corrosion is electromagnetically shielded seal trim strip |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110446408A (en) * | 2019-07-26 | 2019-11-12 | 中国电子科技集团公司第三十三研究所 | A kind of highly conductive p-type composite rubber liner of tear-proof and preparation method thereof |
| CN111212531A (en) * | 2020-02-28 | 2020-05-29 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Preparation method of high-corrosion-resistance LRM module |
| CN112512290A (en) * | 2020-12-10 | 2021-03-16 | 中国电子科技集团公司第三十三研究所 | Method for resisting strong electromagnetic interference of electronic controller case of aircraft engine |
| CN112701503A (en) * | 2020-12-29 | 2021-04-23 | 四川华丰科技股份有限公司 | High-speed three-branch wire connector |
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| CN2834900Y (en) * | 2005-09-15 | 2006-11-08 | 成都市依迈电子化工实业有限公司 | Composite electro-conductive rubber strip |
| CN104494241A (en) * | 2014-12-08 | 2015-04-08 | 国家电网公司 | Electromagnetic shielding composite rubber material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2834900Y (en) * | 2005-09-15 | 2006-11-08 | 成都市依迈电子化工实业有限公司 | Composite electro-conductive rubber strip |
| CN104494241A (en) * | 2014-12-08 | 2015-04-08 | 国家电网公司 | Electromagnetic shielding composite rubber material and preparation method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110446408A (en) * | 2019-07-26 | 2019-11-12 | 中国电子科技集团公司第三十三研究所 | A kind of highly conductive p-type composite rubber liner of tear-proof and preparation method thereof |
| CN110446408B (en) * | 2019-07-26 | 2024-03-19 | 中国电子科技集团公司第三十三研究所 | Tearing-resistant high-conductivity P-type composite rubber gasket and manufacturing method thereof |
| CN111212531A (en) * | 2020-02-28 | 2020-05-29 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Preparation method of high-corrosion-resistance LRM module |
| CN112512290A (en) * | 2020-12-10 | 2021-03-16 | 中国电子科技集团公司第三十三研究所 | Method for resisting strong electromagnetic interference of electronic controller case of aircraft engine |
| CN112701503A (en) * | 2020-12-29 | 2021-04-23 | 四川华丰科技股份有限公司 | High-speed three-branch wire connector |
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Application publication date: 20180518 |