CN112467418B - Radio frequency connector with lightning protection function - Google Patents
Radio frequency connector with lightning protection function Download PDFInfo
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- CN112467418B CN112467418B CN202011121788.3A CN202011121788A CN112467418B CN 112467418 B CN112467418 B CN 112467418B CN 202011121788 A CN202011121788 A CN 202011121788A CN 112467418 B CN112467418 B CN 112467418B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/6608—Structural association with built-in electrical component with built-in single component
- H01R13/6641—Structural association with built-in electrical component with built-in single component with diode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
- H01R11/11—End pieces or tapping pieces for wires, supported by the wire and for facilitating electrical connection to some other wire, terminal or conductive member
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/46—Bases; Cases
- H01R13/53—Bases or cases for heavy duty; Bases or cases for high voltage with means for preventing corona or arcing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/719—Structural association with built-in electrical component specially adapted for high frequency, e.g. with filters
Abstract
The invention discloses a radio frequency connector with a lightning protection function, which comprises a radio frequency connector body, a lightning protection device and a cable connector, wherein the radio frequency connector body, the lightning protection device and the cable connector are sequentially connected from left to right; the lightning protection device comprises a lightning receptor, a conductor and a lightning protection loop which are sequentially connected; the lightning protection device is characterized in that a shielding protection shell is arranged on the outer surface of the lightning protection device, and the lightning receptor is arranged outside the shielding protection shell; the shielding protective shell is made of an electromagnetic shielding material; the electromagnetic shielding material is prepared by mixing modified epoxy resin and foam metal. The radio frequency connector with the lightning protection function is formed by connecting the lightning protection device with the radio frequency connector and the cable connector, has the functions of convenient connection and installation reduction, has a reasonable structure and high practicability, and can avoid unnecessary damage caused by work under the condition of lightning weather.
Description
Technical Field
The invention relates to the field of radio frequency connectors, in particular to a radio frequency connector with a lightning protection function.
Background
The radio frequency connector cable assembly is a widely used connecting piece between radio equipment and between equipment and an antenna, and it is known that various existing radio frequency connector cable assemblies are composed of a radio frequency connector and a cable, and only have a connecting function and no lightning protection function. The antenna and the antenna feeder between the antenna and the equipment are exposed in the space and are easy to be struck by lightning, the prior art generally prevents lightning pulses from invading radio equipment from the antenna and the antenna feeder by installing an independent lightning arrester, and the installation of the independent lightning arrester needs the switching between the lightning arrester and the equipment and between the lightning arrester and an antenna feeder cable, so that the transmission loss is inevitably generated, and the total investment of the equipment is increased; meanwhile, the magnetic field generated by the conventional lightning arrester when the lightning arrester is conducted can influence surrounding electronic elements, a shielding protective shell is usually arranged for preventing the influence, the shielding protective shell used in the prior art is made of metal, but the shielding protective shell has the defects of high density, corrosion resistance and the like, and the higher and higher requirements of the modern society on electromagnetic shielding materials cannot be met.
Disclosure of Invention
In view of the above problems, the present invention provides a radio frequency connector with a lightning protection function, which includes a radio frequency connector body, a lightning protection device and a cable connector sequentially connected from left to right; the lightning protection device comprises a lightning receptor, a conductor and a lightning protection loop which are sequentially connected.
Preferably, the lightning protection circuit is provided with a common resistor, a piezoresistor, a gas discharge tube, a light emitting diode and a transient voltage suppression diode which are connected in sequence through a lead.
Preferably, a ground circuit is further disposed in the lightning protection circuit.
Preferably, the electric conductor is one of a copper wire, an aluminum wire and a copper-nickel alloy wire; the surface of the electric conductor is coated with a first insulating protective coating.
Preferably, the lightning protection device is externally provided with a shielding protection shell, and the lightning receptor is arranged outside the shielding protection shell.
Preferably, a microstrip transmission line circuit board is further disposed in the lightning protection device, and the microstrip transmission line circuit board is used for carrying the lightning protection device and simultaneously for electrically connecting the radio frequency connector body, the lightning protection device and the cable connector.
Preferably, a cable conductor is arranged in the cable connector, and the outer surface of the cable conductor is coated with a second insulation protection coating.
Preferably, the shielding protection shell is made of an electromagnetic shielding material; the electromagnetic shielding material is prepared by mixing modified epoxy resin and foam metal; the preparation method of the modified epoxy resin comprises the following steps:
s1, weighing graphene oxide, adding the graphene oxide into deionized water, and ultrasonically dispersing until the graphene oxide is uniform to obtain a graphene oxide solution; firstly, dropwise adding 0.1mol/L sodium hydroxide solution into the graphene oxide solution, then dropwise adding 0.1mol/L bromoacetic acid solution, heating to 85-95 ℃, carrying out condensation reflux reaction for 2-5 h, naturally cooling to room temperature, filtering to obtain a solid, washing with purified water until the washing liquid is neutral, and drying under reduced pressure to obtain carboxylated graphene;
the mass ratio of the graphene oxide to the deionized water is 1: 10-20; the volume ratio of the sodium hydroxide solution to the bromoacetic acid solution to the graphene oxide solution is 2.8-3.4: 1: 16-24;
s2, weighing diethylamine hydrochloride, adding the diethylamine hydrochloride into deionized water, and stirring until the diethylamine hydrochloride is completely dissolved to obtain a diethylamine hydrochloride solution; adding the carboxylated graphene into the diethylamine hydrochloride solution, adding vinyl tri (beta-methoxyethoxy) silane, stirring and reacting for 5-8 h at room temperature under the protection of inert gas, filtering, taking a solid, washing with purified water for three times, and drying under reduced pressure to obtain diethylamine carboxylated graphene;
wherein the mass ratio of the diethylamine hydrochloride to the deionized water is 1: 15-22; the mass ratio of the carboxylated graphene to the vinyl tri (beta-methoxyethoxy) silane to the diethylamine hydrochloride solution is 1: 0.02-0.1: 12-16;
s3, weighing methanesulfonic acid, adding methanesulfonic acid into deionized water, stirring until the methanesulfonic acid is completely dissolved, adding diethylamine carboxylated graphene, ultrasonically dispersing until the methanesulfonic acid is uniform, adding tricarbonyl hydroxyl zirconic acid triammonium, stirring until the mixture is uniform, pouring the mixture into a reaction kettle with a polytetrafluoroethylene lining, heating to 120-150 ℃, sealing for 5-10 hours, cooling to room temperature, filtering to obtain a solid, washing the solid to be neutral by using purified water, washing the solid for three times by using a saturated ammonium carbonate solution, and drying under reduced pressure to obtain organic zirconium-based graphene;
wherein the mass ratio of methanesulfonic acid, diethylamine carboxylated graphene, tricarbonyl hydroxyl zirconic acid triammonium and deionized water is 1: 6-12: 3-5: 20-38;
s4, weighing the organic zirconium-based graphene, adding the organic zirconium-based graphene into epoxy resin, and stirring and dispersing the organic zirconium-based graphene to be uniform to obtain modified epoxy resin;
the mass ratio of the organic zirconium-based graphene to the epoxy resin is 1: 5-12.
Preferably, the preparation method of the electromagnetic shielding material comprises the following steps:
step 1, adding a foaming agent into the modified epoxy resin, uniformly mixing, heating to 40-60 ℃, and stirring for 2-5 hours to obtain a foamed epoxy resin treatment product;
wherein the mass ratio of the foaming agent to the modified epoxy resin is 1: 10-15;
wherein the mass ratio of the foamed metal, the curing agent and the foamed epoxy resin treatment substance is 1: 4-6: 8-15.
Preferably, the epoxy resin is one or two of bisphenol A type, hydrogenated bisphenol A type and hydroxymethyl bisphenol A type.
Preferably, the metal foam is at least one of aluminum, nickel and an aluminum-nickel alloy.
Preferably, the foaming agent is polydimethylsiloxane or polysiloxane-polyalkoxy ether copolymer.
Preferably, the curing agent is an aliphatic polyamine-type curing agent or an organic acid anhydride-type curing agent.
The invention has the beneficial effects that:
1. the radio frequency connector with the lightning protection function is formed by connecting the lightning protection device with the radio frequency connector and the cable connector, has the functions of convenient connection and installation reduction, has a reasonable structure and high practicability, and can avoid unnecessary damage caused by work under the condition of lightning weather.
2. The lightning protection device is provided with the lightning receptor for receiving direct lightning stroke, so that the damage caused by the lightning stroke on the surface of the electrical radio frequency connector is prevented; the electric conductor is used for guiding received lightning; the lightning protection loop is used for processing received lightning so as to play a role in preventing lightning stroke. The outer surface of the lightning protection device is also provided with a shielding protection shell, and the shielding protection shell ensures that a magnetic field generated by the lightning protection loop in low damping cannot influence surrounding electronic elements.
3. The invention also prepares a shielding and protecting shell with excellent electromagnetic protection effect, and the shielding and protecting shell is prepared by the electromagnetic shielding material; the electromagnetic shielding material is prepared by mixing modified epoxy resin and foam metal. The epoxy resin electromagnetic shielding material is prepared by foaming the epoxy resin and the curing agent serving as matrixes, the foam metal serving as a continuous macroscopic conductive network and the organic zirconium-based graphene serving as a microscopic conductive network, and the preparation method is simple and easy to operate. The epoxy resin is selected as a matrix, and the epoxy resin has stronger mechanical property, corrosion resistance, mildew resistance and water resistance, so that the defects of high density and non-corrosion resistance of a metal material can be overcome, and the defects of high brittleness and poor high temperature resistance (less than 200 ℃) of the epoxy resin are overcome by using the organic zirconium-based graphene for modifying the epoxy resin. The metal additive selected by the invention is foam metal, namely a special metal material containing foam pores, the foam metal has a series of good advantages of low density, good heat insulation performance, good sound insulation performance, capability of absorbing electromagnetic waves and the like, and can be combined with epoxy resin to be more closely attached through the unique structural characteristics, and the contact area is also greatly increased. In addition, the foaming agent is used for preparing the foam structure, so that the overall weight is reduced, the proportion of foam metal on a unit surface can be increased, the distribution is more uniform, the conductivity is enhanced, and the electromagnetic shielding performance is improved.
In conclusion, the shielding protective shell prepared by the invention has the advantages of light weight, excellent mechanical strength, high temperature resistance, corrosion resistance and strong electromagnetic shielding performance, is very suitable for being used as a conductive material and/or an electromagnetic shielding material, and has the advantages of simple preparation method, low energy consumption, high production efficiency and very good industrial prospect.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a schematic structural diagram of a radio frequency connector with lightning protection function according to the present invention;
reference numerals: a radio frequency connector 1; a lightning protection device 2; a lightning receptor 21; an electrical conductor 22; a lightning protection circuit 23; a shield-protecting case 24; a microstrip transmission line circuit board 25; a cable connector 3; cable conductor 31 and cable 4.
Detailed Description
The invention is further described with reference to the following examples.
Example 1
A radio frequency connector with lightning protection function comprises a radio frequency connector 1, a lightning protection device 2 and a cable connector 3 which are sequentially connected from left to right; the lightning protection device 2 comprises a lightning receptor 21, a conductor 22 and a lightning protection loop 23 which are connected in sequence.
The lightning protection loop 23 is provided with a common resistor, a piezoresistor, a gas discharge tube, a light emitting diode and a transient voltage suppression diode which are connected in sequence through a lead.
The conductor 22 is one of a copper wire, an aluminum wire and a copper-nickel alloy wire; the surface of the electrical conductor 22 is coated with a first insulating protective coating.
The outer surface mounting of lightning protection device 2 has shielding protecting sheathing 24, lightning receptor 21 installs shielding protecting sheathing 24's outside.
The lightning protection device 2 is further internally provided with a microstrip transmission line circuit board 25, and the microstrip transmission line circuit board 25 is used for bearing the lightning protection device 2 and simultaneously realizing the electrical connection of the radio frequency connector 1, the lightning protection device 2 and the cable connector 3.
The cable connector 3 is provided with a cable conductor 31 therein, and the outer surface of the cable conductor 31 is coated with a second insulating protective coating.
The shielding protection shell 24 is made of an electromagnetic shielding material; the electromagnetic shielding material is prepared by mixing modified epoxy resin and foam metal; the preparation method of the modified epoxy resin comprises the following steps:
s1, weighing graphene oxide, adding the graphene oxide into deionized water, and ultrasonically dispersing until the graphene oxide is uniform to obtain a graphene oxide solution; firstly, dropwise adding 0.1mol/L sodium hydroxide solution into the graphene oxide solution, then dropwise adding 0.1mol/L bromoacetic acid solution, heating to 85-95 ℃, carrying out condensation reflux reaction for 2-5 h, naturally cooling to room temperature, filtering to obtain a solid, washing with purified water until the washing liquid is neutral, and drying under reduced pressure to obtain carboxylated graphene;
wherein the mass ratio of the graphene oxide to the deionized water is 1: 15; the volume ratio of the sodium hydroxide solution to the bromoacetic acid solution to the graphene oxide solution is 3.0:1: 20;
s2, weighing diethylamine hydrochloride, adding the diethylamine hydrochloride into deionized water, and stirring until the diethylamine hydrochloride is completely dissolved to obtain a diethylamine hydrochloride solution; adding the carboxylated graphene into the diethylamine hydrochloride solution, adding vinyl tri (beta-methoxyethoxy) silane, stirring and reacting for 5-8 h at room temperature under the protection of inert gas, filtering, taking a solid, washing with purified water for three times, and drying under reduced pressure to obtain diethylamine carboxylated graphene;
wherein the mass ratio of the diethylamine hydrochloride to the deionized water is 1: 18; the mass ratio of the carboxylated graphene to the vinyl tri (beta-methoxyethoxy) silane to the diethylamine hydrochloride solution is 1:0.06: 14;
s3, weighing methanesulfonic acid, adding methanesulfonic acid into deionized water, stirring until the methanesulfonic acid is completely dissolved, adding diethylamine carboxylated graphene, ultrasonically dispersing until the methanesulfonic acid is uniform, adding tricarbonyl hydroxyl zirconic acid triammonium, stirring until the mixture is uniform, pouring the mixture into a reaction kettle with a polytetrafluoroethylene lining, heating to 120-150 ℃, sealing for 5-10 hours, cooling to room temperature, filtering to obtain a solid, washing the solid to be neutral by using purified water, washing the solid for three times by using a saturated ammonium carbonate solution, and drying under reduced pressure to obtain organic zirconium-based graphene;
wherein the mass ratio of methanesulfonic acid, diethylamine carboxylated graphene, tricarbonyl hydroxyl zirconic acid triammonium to deionized water is 1:9:4: 30;
s4, weighing the organic zirconium-based graphene, adding the organic zirconium-based graphene into epoxy resin, and stirring and dispersing the organic zirconium-based graphene to be uniform to obtain modified epoxy resin;
wherein the mass ratio of the organic zirconium-based graphene to the epoxy resin is 1: 8.
The preparation method of the electromagnetic shielding material comprises the following steps:
step 1, adding a foaming agent into the modified epoxy resin, uniformly mixing, heating to 40-60 ℃, and stirring for 2-5 hours to obtain a foamed epoxy resin treatment product;
wherein the mass ratio of the foaming agent to the modified epoxy resin is 1: 12;
wherein the mass ratio of the foamed metal, the curing agent and the foamed epoxy resin treatment substance is 1:5: 12.
Wherein the epoxy resin is bisphenol A type. The foam metal is aluminum. The foaming agent is polydimethylsiloxane. The curing agent is an aliphatic polyamine curing agent.
Example 2
A radio frequency connector with lightning protection function comprises a radio frequency connector 1, a lightning protection device 2 and a cable connector 3 which are sequentially connected from left to right; the lightning protection device 2 comprises a lightning receptor 21, a conductor 22 and a lightning protection loop 23 which are connected in sequence.
The lightning protection loop 23 is provided with a common resistor, a piezoresistor, a gas discharge tube, a light emitting diode and a transient voltage suppression diode which are connected in sequence through a lead.
The conductor 22 is one of a copper wire, an aluminum wire and a copper-nickel alloy wire; the surface of the electrical conductor 22 is coated with a first insulating protective coating.
The outer surface mounting of lightning protection device 2 has shielding protecting sheathing 24, lightning receptor 21 installs shielding protecting sheathing 24's outside.
The lightning protection device 2 is further internally provided with a microstrip transmission line circuit board 25, and the microstrip transmission line circuit board 25 is used for bearing the lightning protection device 2 and simultaneously realizing the electrical connection of the radio frequency connector 1, the lightning protection device 2 and the cable connector 3.
The cable connector 3 is provided with a cable conductor 31 therein, and the outer surface of the cable conductor 31 is coated with a second insulating protective coating.
The shielding protection shell 24 is made of an electromagnetic shielding material; the electromagnetic shielding material is prepared by mixing modified epoxy resin and foam metal; the preparation method of the modified epoxy resin comprises the following steps:
s1, weighing graphene oxide, adding the graphene oxide into deionized water, and ultrasonically dispersing until the graphene oxide is uniform to obtain a graphene oxide solution; firstly, dropwise adding 0.1mol/L sodium hydroxide solution into the graphene oxide solution, then dropwise adding 0.1mol/L bromoacetic acid solution, heating to 85-95 ℃, carrying out condensation reflux reaction for 2-5 h, naturally cooling to room temperature, filtering to obtain a solid, washing with purified water until the washing liquid is neutral, and drying under reduced pressure to obtain carboxylated graphene;
wherein the mass ratio of the graphene oxide to the deionized water is 1: 10; the volume ratio of the sodium hydroxide solution to the bromoacetic acid solution to the graphene oxide solution is 2.8:1: 16;
s2, weighing diethylamine hydrochloride, adding the diethylamine hydrochloride into deionized water, and stirring until the diethylamine hydrochloride is completely dissolved to obtain a diethylamine hydrochloride solution; adding the carboxylated graphene into the diethylamine hydrochloride solution, adding vinyl tri (beta-methoxyethoxy) silane, stirring and reacting for 5-8 h at room temperature under the protection of inert gas, filtering, taking a solid, washing with purified water for three times, and drying under reduced pressure to obtain diethylamine carboxylated graphene;
wherein the mass ratio of the diethylamine hydrochloride to the deionized water is 1: 15; the mass ratio of the carboxylated graphene to the vinyl tri (beta-methoxyethoxy) silane to the diethylamine hydrochloride solution is 1:0.02: 12;
s3, weighing methanesulfonic acid, adding methanesulfonic acid into deionized water, stirring until the methanesulfonic acid is completely dissolved, adding diethylamine carboxylated graphene, ultrasonically dispersing until the methanesulfonic acid is uniform, adding tricarbonyl hydroxyl zirconic acid triammonium, stirring until the mixture is uniform, pouring the mixture into a reaction kettle with a polytetrafluoroethylene lining, heating to 120-150 ℃, sealing for 5-10 hours, cooling to room temperature, filtering to obtain a solid, washing the solid to be neutral by using purified water, washing the solid for three times by using a saturated ammonium carbonate solution, and drying under reduced pressure to obtain organic zirconium-based graphene;
wherein the mass ratio of methanesulfonic acid, diethylamine carboxylated graphene, tricarbonyl hydroxyl zirconic acid triammonium to deionized water is 1:6:3: 20;
s4, weighing the organic zirconium-based graphene, adding the organic zirconium-based graphene into epoxy resin, and stirring and dispersing the organic zirconium-based graphene to be uniform to obtain modified epoxy resin;
wherein the mass ratio of the organic zirconium-based graphene to the epoxy resin is 1: 5.
The preparation method of the electromagnetic shielding material comprises the following steps:
step 1, adding a foaming agent into the modified epoxy resin, uniformly mixing, heating to 40-60 ℃, and stirring for 2-5 hours to obtain a foamed epoxy resin treatment product;
wherein the mass ratio of the foaming agent to the modified epoxy resin is 1: 10;
wherein the mass ratio of the foamed metal, the curing agent and the foamed epoxy resin treatment substance is 1:4: 8.
Wherein the epoxy resin is hydroxymethyl bisphenol A type. The foam metal is an aluminum-nickel alloy. The foaming agent is polydimethylsiloxane. The curing agent is an organic acid anhydride curing agent.
Example 3
A radio frequency connector with lightning protection function comprises a radio frequency connector 1, a lightning protection device 2 and a cable connector 3 which are sequentially connected from left to right; the lightning protection device 2 comprises a lightning receptor 21, a conductor 22 and a lightning protection loop 23 which are connected in sequence.
The lightning protection loop 23 is provided with a common resistor, a piezoresistor, a gas discharge tube, a light emitting diode and a transient voltage suppression diode which are connected in sequence through a lead.
The conductor 22 is one of a copper wire, an aluminum wire and a copper-nickel alloy wire; the surface of the electrical conductor 22 is coated with a first insulating protective coating.
The outer surface mounting of lightning protection device 2 has shielding protecting sheathing 24, lightning receptor 21 installs shielding protecting sheathing 24's outside.
The lightning protection device 2 is further internally provided with a microstrip transmission line circuit board 25, and the microstrip transmission line circuit board 25 is used for bearing the lightning protection device 2 and simultaneously realizing the electrical connection of the radio frequency connector 1, the lightning protection device 2 and the cable connector 3.
The cable connector 3 is provided with a cable conductor 31 therein, and the outer surface of the cable conductor 31 is coated with a second insulating protective coating.
The shielding protection shell 24 is made of an electromagnetic shielding material; the electromagnetic shielding material is prepared by mixing modified epoxy resin and foam metal; the preparation method of the modified epoxy resin comprises the following steps:
s1, weighing graphene oxide, adding the graphene oxide into deionized water, and ultrasonically dispersing until the graphene oxide is uniform to obtain a graphene oxide solution; firstly, dropwise adding 0.1mol/L sodium hydroxide solution into the graphene oxide solution, then dropwise adding 0.1mol/L bromoacetic acid solution, heating to 85-95 ℃, carrying out condensation reflux reaction for 2-5 h, naturally cooling to room temperature, filtering to obtain a solid, washing with purified water until the washing liquid is neutral, and drying under reduced pressure to obtain carboxylated graphene;
the mass ratio of the graphene oxide to the deionized water is 1: 10-20; the volume ratio of the sodium hydroxide solution to the bromoacetic acid solution to the graphene oxide solution is 3.4:1: 24;
s2, weighing diethylamine hydrochloride, adding the diethylamine hydrochloride into deionized water, and stirring until the diethylamine hydrochloride is completely dissolved to obtain a diethylamine hydrochloride solution; adding the carboxylated graphene into the diethylamine hydrochloride solution, adding vinyl tri (beta-methoxyethoxy) silane, stirring and reacting for 5-8 h at room temperature under the protection of inert gas, filtering, taking a solid, washing with purified water for three times, and drying under reduced pressure to obtain diethylamine carboxylated graphene;
wherein the mass ratio of the diethylamine hydrochloride to the deionized water is 1: 22; the mass ratio of the carboxylated graphene to the vinyl tri (beta-methoxyethoxy) silane to the diethylamine hydrochloride solution is 1:0.1: 16;
s3, weighing methanesulfonic acid, adding methanesulfonic acid into deionized water, stirring until the methanesulfonic acid is completely dissolved, adding diethylamine carboxylated graphene, ultrasonically dispersing until the methanesulfonic acid is uniform, adding tricarbonyl hydroxyl zirconic acid triammonium, stirring until the mixture is uniform, pouring the mixture into a reaction kettle with a polytetrafluoroethylene lining, heating to 120-150 ℃, sealing for 5-10 hours, cooling to room temperature, filtering to obtain a solid, washing the solid to be neutral by using purified water, washing the solid for three times by using a saturated ammonium carbonate solution, and drying under reduced pressure to obtain organic zirconium-based graphene;
wherein the mass ratio of methanesulfonic acid, diethylamine carboxylated graphene, tricarbonyl hydroxyl zirconic acid triammonium and deionized water is 1:12:5: 38;
s4, weighing the organic zirconium-based graphene, adding the organic zirconium-based graphene into epoxy resin, and stirring and dispersing the organic zirconium-based graphene to be uniform to obtain modified epoxy resin;
wherein the mass ratio of the organic zirconium-based graphene to the epoxy resin is 1: 12.
The preparation method of the electromagnetic shielding material comprises the following steps:
step 1, adding a foaming agent into the modified epoxy resin, uniformly mixing, heating to 40-60 ℃, and stirring for 2-5 hours to obtain a foamed epoxy resin treatment product;
wherein the mass ratio of the foaming agent to the modified epoxy resin is 1: 15;
wherein the mass ratio of the foamed metal, the curing agent and the foamed epoxy resin treatment substance is 1:6: 15.
Wherein the epoxy resin is hydrogenated bisphenol A type. The foam metal is nickel. The foaming agent is polysiloxane-polyalkoxyether copolymer. The curing agent is an organic acid anhydride curing agent.
Comparative example
The radio frequency connector with the lightning protection function comprises a lightning protection device, wherein a shielding protection shell is arranged on the outer surface of the lightning protection device.
The shielding protective shell is made of an electromagnetic shielding material; the electromagnetic shielding material is prepared by mixing modified epoxy resin and foam metal; the preparation method of the modified epoxy resin comprises the following steps:
weighing the graphene oxide, adding the graphene oxide into epoxy resin, and stirring and dispersing the graphene oxide to be uniform to obtain modified epoxy resin;
wherein the mass ratio of the graphene oxide to the epoxy resin is 1: 8.
The preparation method of the electromagnetic shielding material comprises the following steps:
step 1, adding a foaming agent into the modified epoxy resin, uniformly mixing, heating to 40-60 ℃, and stirring for 2-5 hours to obtain a foamed epoxy resin treatment product;
wherein the mass ratio of the foaming agent to the modified epoxy resin is 1: 12;
wherein the mass ratio of the foamed metal, the curing agent and the foamed epoxy resin treatment substance is 1:5: 12.
Wherein the epoxy resin is bisphenol A type. The foam metal is aluminum. The foaming agent is polydimethylsiloxane. The curing agent is an aliphatic polyamine curing agent.
In order to more clearly illustrate the present invention, the performance of the electromagnetic shielding materials prepared in the embodiments 1 to 3 of the present invention and the comparative example was tested, and the testing method was:
1. testing the resistance of the obtained electromagnetic shielding material by using a U-NIT two-probe resistance tester, and calculating the resistivity of the material according to the following formula:
ρ＝RS/L；
(where ρ is the resistivity of the material; R is the resistance of the material; S is the cross-sectional area of the material; and L is the length of the material).
2. And performing electromagnetic shielding test on the obtained electromagnetic shielding material by using an Agilent8720ET electromagnetic shielding tester according to the military standard SJ20524 of the electronic industry of the people's republic of China. The scanning frequency band is 0.05-20 GHz, the input is 0dBm, the test point is 201, the thickness of the wafer sample is 2mm, and the diameter is 10 mm;
3. testing the density of the obtained electromagnetic shielding material by adopting a drainage method;
4. adopting an INSTRON 4302 type universal material testing machine to test the compression performance of the obtained material with the size of 30 multiplied by 15mm, using a compression sensor with 30KN and a testing speed of 2mm/min, and evaluating the mechanical performance of the obtained material according to the strength and the modulus when the compression strain is 10%;
5. corrosion resistance: the corrosion resistance detection is divided into acid resistance detection and alkali resistance detection, wherein the alkali resistance is that the glass is soaked in a sodium hydroxide solution with the mass concentration of 10% for 10 hours; the acid resistance is that the steel is soaked in a sulfuric acid solution with the mass fraction of 10% for 10 hours.
6. The heat distortion temperature Tg is determined according to the standard GB/T1634-2004.
The results are shown in Table 1.
TABLE 1 comparison of the Properties of different electromagnetic shielding materials
| Example 1 | Example 2 | Example 3 | Comparative example | |
| Density (g/cm)3) | 0.46 | 0.52 | 0.53 | 0.34 |
| Compressive Strength (MPa) | 19.7 | 17.4 | 20.2 | 10.3 |
| Resistivity (omega cm) | 0.4635 | 0.5143 | 0.4077 | 1.0328 |
| Average electromagnetic shielding performance (dB) | 78 | 72 | 81 | 59 |
| Corrosion resistance (acid and alkali resistance) | No obvious change on the surface | No obvious change on the surface | No obvious change on the surface | Little surface blistering |
| Heat distortion temperature Tg (. degree. C.) | 252 | 247 | 253 | 181 |
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. A radio frequency connector with a lightning protection function is characterized by comprising a radio frequency connector body, a lightning protection device and a cable connector which are sequentially connected from left to right; the lightning protection device comprises a lightning receptor, a conductor and a lightning protection loop which are sequentially connected; the lightning protection device is characterized in that a shielding protection shell is arranged on the outer surface of the lightning protection device, and the lightning receptor is arranged outside the shielding protection shell; the shielding protective shell is made of an electromagnetic shielding material; the electromagnetic shielding material is prepared by mixing modified epoxy resin and foam metal;
the preparation method of the modified epoxy resin comprises the following steps:
s1, weighing graphene oxide, adding the graphene oxide into deionized water, and ultrasonically dispersing until the graphene oxide is uniform to obtain a graphene oxide solution; firstly, dropwise adding 0.1mol/L sodium hydroxide solution into the graphene oxide solution, then dropwise adding 0.1mol/L bromoacetic acid solution, heating to 85-95 ℃, carrying out condensation reflux reaction for 2-5 h, naturally cooling to room temperature, filtering to obtain a solid, washing with purified water until the washing liquid is neutral, and drying under reduced pressure to obtain carboxylated graphene;
the mass ratio of the graphene oxide to the deionized water is 1: 10-20; the volume ratio of the sodium hydroxide solution to the bromoacetic acid solution to the graphene oxide solution is 2.8-3.4: 1: 16-24;
s2, weighing diethylamine hydrochloride, adding the diethylamine hydrochloride into deionized water, and stirring until the diethylamine hydrochloride is completely dissolved to obtain a diethylamine hydrochloride solution; adding the carboxylated graphene into the diethylamine hydrochloride solution, adding vinyl tri (beta-methoxyethoxy) silane, stirring and reacting for 5-8 h at room temperature under the protection of inert gas, filtering, taking a solid, washing with purified water for three times, and drying under reduced pressure to obtain diethylamine carboxylated graphene;
wherein the mass ratio of the diethylamine hydrochloride to the deionized water is 1: 15-22; the mass ratio of the carboxylated graphene to the vinyl tri (beta-methoxyethoxy) silane to the diethylamine hydrochloride solution is 1: 0.02-0.1: 12-16;
s3, weighing methanesulfonic acid, adding methanesulfonic acid into deionized water, stirring until the methanesulfonic acid is completely dissolved, adding diethylamine carboxylated graphene, ultrasonically dispersing until the methanesulfonic acid is uniform, adding tricarbonyl hydroxyl zirconic acid triammonium, stirring until the mixture is uniform, pouring the mixture into a reaction kettle with a polytetrafluoroethylene lining, heating to 120-150 ℃, sealing for 5-10 hours, cooling to room temperature, filtering to obtain a solid, washing the solid to be neutral by using purified water, washing the solid for three times by using a saturated ammonium carbonate solution, and drying under reduced pressure to obtain organic zirconium-based graphene;
wherein the mass ratio of methanesulfonic acid, diethylamine carboxylated graphene, tricarbonyl hydroxyl zirconic acid triammonium and deionized water is 1: 6-12: 3-5: 20-38;
s4, weighing the organic zirconium-based graphene, adding the organic zirconium-based graphene into epoxy resin, and stirring and dispersing the organic zirconium-based graphene to be uniform to obtain modified epoxy resin;
the mass ratio of the organic zirconium-based graphene to the epoxy resin is 1: 5-12.
2. The radio frequency connector with the lightning protection function according to claim 1, wherein the lightning protection loop is provided with a common resistor, a piezoresistor, a gas discharge tube, a light emitting diode and a transient voltage suppression diode which are connected in sequence through a lead; and a grounding loop is also arranged in the lightning protection loop.
3. The radio frequency connector with lightning protection function according to claim 1, wherein the electrical conductor is one of copper wire, aluminum wire and copper-nickel alloy wire; the surface of the electric conductor is coated with a first insulating protective coating.
4. The radio frequency connector with a lightning protection function according to claim 1, wherein a microstrip transmission line circuit board is further disposed in the lightning protection device, and the microstrip transmission line circuit board is configured to carry the lightning protection device and to electrically connect the radio frequency connector body, the lightning protection device and the cable connector.
5. The radio frequency connector with lightning protection function as claimed in claim 4, wherein a cable conductor is arranged in the cable connector, and the outer surface of the cable conductor is coated with a second insulating protection coating.
6. The radio frequency connector with lightning protection function according to claim 1, wherein the electromagnetic shielding material is prepared by the following steps:
step 1, adding a foaming agent into the modified epoxy resin, uniformly mixing, heating to 40-60 ℃, and stirring for 2-5 hours to obtain a foamed epoxy resin treatment product;
wherein the mass ratio of the foaming agent to the modified epoxy resin is 1: 10-15;
step 2, adding foam metal into the foamed epoxy resin treatment object, stirring and dispersing the foam metal uniformly, adding a curing agent, stirring the mixture uniformly again, and placing the mixture in a mold for molding to obtain the electromagnetic shielding material;
wherein the mass ratio of the foamed metal, the curing agent and the foamed epoxy resin treatment substance is 1: 4-6: 8-15.
7. The radio frequency connector with lightning protection function according to claim 1, wherein the epoxy resin is one or two of bisphenol A type, hydrogenated bisphenol A type and hydroxymethyl bisphenol A type.
8. The connector of claim 6, wherein the metal foam is at least one of aluminum, nickel and aluminum-nickel alloy.
9. The radio frequency connector with lightning protection function of claim 6, wherein the foaming agent is polydimethylsiloxane or polysiloxane-polyalkoxyether copolymer; the curing agent is an aliphatic polyamine curing agent or an organic acid anhydride curing agent.
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