CN118514867B - Patch type electrostatic discharge device and preparation method thereof - Google Patents
Patch type electrostatic discharge device and preparation method thereof Download PDFInfo
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- CN118514867B CN118514867B CN202410973904.6A CN202410973904A CN118514867B CN 118514867 B CN118514867 B CN 118514867B CN 202410973904 A CN202410973904 A CN 202410973904A CN 118514867 B CN118514867 B CN 118514867B
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- 238000002360 preparation method Methods 0.000 title abstract description 15
- 238000005507 spraying Methods 0.000 claims abstract description 33
- 239000003973 paint Substances 0.000 claims abstract description 27
- 239000000758 substrate Substances 0.000 claims abstract description 26
- 239000002313 adhesive film Substances 0.000 claims abstract description 23
- 238000001746 injection moulding Methods 0.000 claims description 16
- 238000007599 discharging Methods 0.000 claims description 15
- 239000003365 glass fiber Substances 0.000 claims description 15
- 239000007921 spray Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 11
- 239000011265 semifinished product Substances 0.000 claims description 11
- 229920006351 engineering plastic Polymers 0.000 claims description 10
- 239000011159 matrix material Substances 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
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- 238000004519 manufacturing process Methods 0.000 claims description 5
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- 239000004642 Polyimide Substances 0.000 description 5
- 229920001721 polyimide Polymers 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 230000005686 electrostatic field Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
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- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 239000004697 Polyetherimide Substances 0.000 description 1
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- 238000002679 ablation Methods 0.000 description 1
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- 229920002530 polyetherether ketone Polymers 0.000 description 1
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- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D45/00—Aircraft indicators or protectors not otherwise provided for
- B64D45/02—Lightning protectors; Static dischargers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
- B64F5/10—Manufacturing or assembling aircraft, e.g. jigs therefor
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Aviation & Aerospace Engineering (AREA)
- Transportation (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention belongs to the technical field of static protection, and discloses a patch type static discharge device and a preparation method thereof, wherein the device comprises a static discharge unit consisting of a discharge module and a lap belt, the discharge module is comb-shaped as a whole, the lap belt is arranged in a strip-shaped area of the discharge module, adhesive films are adhered to the upper surface and the lower surface of the static discharge unit, and an upper substrate and a lower substrate are respectively adhered through the adhesive films; a plurality of through holes are formed in the surface of the upper substrate opposite to the strip-shaped area of the discharge module, and penetrate through the adhesive film, the electrostatic discharge unit and the lower substrate. The preparation method comprises the steps of preparing a discharge module; spraying a paint layer on the surface of the discharge module to enable the surface resistance of the discharge module to reach 1MΩ/≡to 100MΩ/≡, and arranging a lap joint belt in a strip-shaped area of the discharge module to form an electrostatic discharge unit; bonding a substrate structure on the surface of the electrostatic discharge unit; finally, opening the via hole. The invention can not only not increase the aerodynamic resistance of the aircraft, but also ensure good electrostatic discharge effect.
Description
Technical Field
The invention belongs to the technical field of electrostatic protection, and particularly relates to a patch type electrostatic discharge device and a preparation method of the patch type electrostatic discharge device.
Background
Under the action of air flow friction, the surface material of the airplane can continuously accumulate charges, when the charges accumulated on the surface of the airplane reach a certain degree, electrostatic field distribution is formed in the surrounding space of the airplane, electrostatic discharge can occur when the electric field intensity exceeds a discharge threshold value, and a pulse discharge current and a transient electromagnetic radiation field are formed, so that radio frequency interference and even serious safety threat are formed on electronic equipment, inflammable and explosive devices and the like carried by the airplane. Once the space around the aircraft forms an electrostatic field, serious consequences are faced under the induction of strong electromagnetic environment, and in the present situation, electrostatic protection is one of the important factors affecting the flight safety of the aircraft. In order to ensure the flight safety of an aircraft, an electrostatic discharge device is usually required to be installed at the rear edge of an aircraft structure.
While conventional electrostatic discharge devices are all bar-like structures extending from the trailing edge portion of the skin of the aircraft, electrostatic discharge devices that protrude from the exterior of the aircraft structure can affect the appearance of the aircraft while increasing aerodynamic drag of the aircraft. For example, publication numbers CN204750581U, CN216581057U and CN209126982U both disclose electrostatic dischargers, and the scheme mainly comprises a base and an electrostatic discharge rod, and the electrostatic discharge rod is installed on the surface of an aircraft skin. The product protrudes out of the aircraft structure after being mounted on the aircraft, and protrudes out of the rear edge of the aircraft structure by 100-200 mm, so that the resistance in the aircraft flight process is increased, and the fracture phenomenon caused by the passing operation in the daily maintenance operation of ground personnel is easily caused.
Therefore, there is an urgent need for an electrostatic discharge device that can ensure a good electrostatic discharge effect without increasing aerodynamic drag of an aircraft.
Disclosure of Invention
The invention aims to provide a patch type electrostatic discharge device which can not only increase aerodynamic drag of an airplane but also ensure good electrostatic discharge effect.
Another object of the present invention is to provide a method for manufacturing a chip electrostatic discharge device
The first technical scheme adopted by the invention is that the patch type electrostatic discharge device comprises an electrostatic discharge unit consisting of a discharge module and a lap belt, wherein the discharge module is comb-shaped as a whole, the lap belt is arranged in a strip-shaped area of the discharge module, the upper surface and the lower surface of the electrostatic discharge unit are both adhered with adhesive films, and the upper surface and the lower surface of the electrostatic discharge unit are respectively adhered with an upper substrate and a lower substrate through the adhesive films;
A plurality of through holes are formed in the surface of the upper substrate opposite to the strip-shaped area of the discharge module, and penetrate through the adhesive film, the electrostatic discharge unit and the lower substrate.
The first aspect of the present invention is also characterized in that,
The discharging module comprises a plurality of discharging channels, the plurality of discharging channels are arranged on the same side of the discharging module to form a comb-shaped structure of the discharging module, the length L of each discharging channel is 50 mm-100 mm, and the width of each discharging channel is 3 mm-10 mm; the spacing between the adjacent discharge channels is equal, and the spacing between the adjacent discharge channels is not less than 30mm;
The plurality of through holes are uniformly distributed along the long side direction of the lap joint belt.
The length of the discharge channel is L+1 mm-5 mm; the discharge channel is any one of rectangular, ladder-shaped, sawtooth-shaped and cylindrical.
The surface resistance of the discharge module is 1MΩ/≡to 100MΩ/≡.
The shear strength of the adhesive film 11 is not less than 25MPa.
The second technical scheme adopted by the invention is that the preparation method of the patch type electrostatic discharge device is implemented according to the following steps:
Step 1, preparing a discharge module by selecting engineering plastics;
Step 2, spraying an electrostatic paint layer on the surface of the discharge module to enable the surface resistance of the discharge module to reach 1MΩ/≡100MΩ/≡; if the engineering plastic selected in the step 1 is added with the conductive factor and the surface resistance of the discharge module reaches 1MΩ/≡100MΩ/≡, directly performing the step 3;
step 3, arranging a lap belt in a strip-shaped area of the discharge module to form an electrostatic discharge unit;
step 4, sequentially bonding the adhesive film, the upper substrate and the lower substrate on the upper surface and the lower surface of the electrostatic discharge unit to obtain a semi-finished product of the patch type electrostatic discharge device;
and 5, opening a via hole on the semi-finished product of the patch type electrostatic discharge device at the position corresponding to the lap joint belt to obtain the patch type electrostatic discharge device.
The second solution of the invention is also characterized in that,
The step 1 is specifically to obtain a discharge module by machining according to a drawing or to implement according to the following steps:
Step 1.1, injecting engineering plastic particles into a die cavity of a die through an injection molding machine, wherein the injection molding temperature is 300-350 ℃, the injection molding pressure is 60-80 MPa, the injection molding time is 5-7 s, and the die is heated to 170-190 ℃ after injection molding is finished;
and 1.2, maintaining the pressure of the die for 10-20 s, and cooling the die to normal temperature to obtain the discharge module.
In the step 2, spraying an electrostatic paint layer on the surface of the discharge module is specifically implemented according to the following steps:
step 2.1, treating the surface of a discharge module;
2.2, spraying electrostatic paint on the surface of the discharge module by using a spray gun, wherein the caliber of the spray gun is 1.0 mm-5 mm, the spraying pressure is 0.4 MPa-0.6 MPa, the spraying distance is 100 mm-300 mm, the spraying times are 5-7, and finally, the electrostatic paint layer with the thickness of 20-50 mu m is formed;
Step 2.3, placing the sprayed discharge module in an oven at 150-170 ℃ for heating and curing, and taking out after curing is completed;
And 2.4, detecting the surface resistance of the discharge module by using a surface resistance meter, and repeating the steps 2.2-2.3 if the surface resistance of the discharge module does not meet the requirement.
Step 3 is specifically to paste metal foil or metal mesh on the strip-shaped area of the discharge module to form a lap belt or to implement the following steps:
Step 3.1, spraying conductive paint on a strip-shaped area of the discharge module by using a spray gun, wherein the caliber of the spray gun is 1.0 mm-5 mm, the spraying pressure is 0.4 MPa-0.6 MPa, the spraying distance is 100 mm-300 mm, the spraying times are 5-7 times, and finally, the conductive paint layer with the thickness of 20 mu m-50 mu m is formed;
And 3.2, placing the sprayed discharge module in an oven at 150-170 ℃ for heating and curing, and forming the lap joint belt after curing is completed.
Step 4 is specifically implemented according to the following steps:
step 4.1, selecting glass fiber prepregs for forming an upper matrix and a lower matrix;
step 4.2, bonding adhesive films on the upper surface and the lower surface of the electrostatic discharge unit;
step 4.3, placing 3-10 layers of the glass fiber prepreg selected in the step 1 on the upper surface and the lower surface of the electrostatic discharge unit respectively, then placing the electrostatic discharge unit into a mould, and forming an electrostatic discharge device blank after curing;
Step 4.4, placing the die provided with the blank of the electrostatic discharge device into a vacuum bag, sealing, pumping out air in the vacuum bag through a vacuum pump, placing the vacuum bag into an autoclave for compression molding, wherein the heating temperature is 150-170 ℃, and the heat preservation time is 180min;
And 4.5, after the forming is finished, cooling to normal temperature at a speed of not more than 2 ℃/min, and taking out the blank of the electrostatic discharge device for surface treatment to obtain a semi-finished product of the patch type electrostatic discharge device.
The beneficial effects of the invention are as follows:
(1) After the patch type electrostatic discharge device is mounted on the aircraft skin structure, the patch type electrostatic discharge device is in the same shape as the aircraft structure, does not protrude out of the surface structure of the aircraft body, can reduce the influence of the electrostatic discharge device on aerodynamic resistance to zero, can avoid the risk of accidental fracture caused by maintenance of the aircraft, and greatly prolongs the service life of the electrostatic discharge device.
(2) The electrostatic discharge performance of the patch type electrostatic discharge device meets the requirements of MIL-DTL-9129G, namely the electrostatic protection requirements of the existing novel aircraft.
Drawings
FIG. 1 is a schematic view of the structure of a patch type electrostatic discharge device of the present invention mounted on an aircraft wing;
FIG. 2 is a cross-sectional view in the forward direction of FIG. 1;
FIG. 3 is a cross-sectional side view of FIG. 1;
FIG. 4 is a schematic diagram of a patch type ESD device according to the present invention;
FIG. 5a is a schematic diagram of an ESD unit with a single discharge channel according to the present invention;
FIG. 5b is a schematic diagram of an ESD unit with three discharge channels according to the present invention;
fig. 6 is a discharge current diagram of the patch type electrostatic discharge device of the present invention.
In the figure, 1, aircraft skin, 2. U-shaped slot, 3, matrix structure, 4, upper matrix, 5, lower matrix, 6, electrostatic discharge cell, 7, discharge module, 71, first discharge channel, 72, second discharge channel, 73, third discharge channel, 10, landing strip, 11, glue film, 12, via, 13, tip a,14, tip b.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
As shown in fig. 1, the patch type electrostatic discharge device prepared by the invention is arranged on the aircraft skin 1 through bolts or rivets, the overlap resistance between the patch type electrostatic discharge device and the aircraft skin 1 is less than 100k omega, the whole patch type electrostatic discharge device does not protrude out of the surface structure of the aircraft body after being arranged, the influence of the electrostatic discharge device on aerodynamic resistance can be reduced to zero, and the electrostatic protection requirement of a novel aircraft is met.
As shown in fig. 2 and 3, the patch type electrostatic discharge device of the present invention includes an electrostatic discharge unit 6, an upper substrate 4 and a lower substrate 5 are respectively disposed on the upper and lower surfaces of the electrostatic discharge unit 6, the upper and lower substrates are bonded to the electrostatic discharge unit 6 through a glue film 11, a plurality of through holes 12 for passing through screws or rivets are further formed on the patch type electrostatic discharge device, and the patch type electrostatic discharge device of the present invention is fixedly connected with the aircraft skin 1 by passing the screws or rivets through the through holes 12 and fixedly connecting with the aircraft skin 1.
Further, in order to avoid electrostatic discharge causing electrostatic ablation of the aircraft skin 1, fillet treatment is performed at the positions of the aircraft skin 1 adjacent to the patch type electrostatic discharge device of the present invention, that is, at the positions of the tip a13 and the tip b 14.
Example 1
The patch type electrostatic discharge device of the present invention, as shown in fig. 4, comprises an electrostatic discharge unit 6 composed of a discharge module 7 and a strap 10, wherein the discharge module 7 is made of engineering plastics, such as polyphenylene sulfide, polyimide, polyether ether ketone, polyetherimide, etc.
The upper and lower surfaces of the electrostatic discharge unit 6 are adhered with adhesive films 11, and the shearing strength of the adhesive films 11 is not less than 25MPa. The upper surface and the lower surface of the electrostatic discharge unit 6 are respectively connected with an upper substrate 4 and a lower substrate 5 through adhesive films 11; the upper and lower base bodies 4, 5 form a base structure 3, and the base structure 3 is made of the same material as the aircraft skin 1, such as glass fiber composite, carbon fiber composite, etc.
As shown in fig. 5a, the discharge module 7 includes a plurality of discharge channels, the plurality of discharge channels are all disposed on the same side, forming a comb-like structure of the discharge module 7, and the length L of a single discharge channel is 50 mm-100 mm, and the width B is 3 mm-10 mm.
As shown in fig. 5b, a first discharge path 71, a second discharge path 72, and a third discharge path 73 are provided, respectively, and the discharge paths have any one of rectangular, trapezoidal, zigzag, and cylindrical shapes. The interval between adjacent discharge channels is equal, and the interval D between adjacent discharge channels is not less than 30mm, so that the discharge channels are prevented from being affected each other in the electrostatic discharge process.
Further, the length of the discharge channel is L+1 mm-5 mm; in fig. 4, the first discharge channel 71 extends out of the rear edge of the aircraft structure, the second discharge channel 72 is flush with the rear edge of the aircraft structure, the third discharge channel 73 is centrally disposed in the U-shaped groove 2 at the rear edge of the aircraft structure, and the discharge channel extends out of the rear edge of the aircraft by 1mm to 5mm or is disposed in the U-shaped groove 2 at the rear edge of the aircraft structure, which is measured by experiments. The U-shaped groove 2 at the trailing edge of the aircraft structure needs to be rounded to avoid electrostatic discharge of the aircraft skin 1.
By controlling the number, the structural size, the spacing and the surface resistance of the discharge channels and the structural relation with the rear edge of the aircraft structure, the patch type electrostatic discharge device can realize the electrostatic discharge function and achieve the discharge performance index of related technical requirements.
Further, electrostatic paint is sprayed on the surface of the discharge module 7 or a conductive factor is added to the raw material, so that the surface resistance is 1MΩ/≡100MΩ/≡. Meanwhile, the end of the discharge channel far away from the lap belt 10 is a discharge end, and the curvature radius of the discharge end needs to be controlled to ensure the electrostatic discharge effect.
Further, the strip-shaped area of the discharge module 7 is provided with a lap belt 10, the lap belt 10 is formed by spraying conductive paint or arranging metal strips on the surface of the strip-shaped area of the discharge module 7, the lap belt 10 is a bridge for connecting an aircraft body and a discharge unit, and static charges reach each discharge channel through the lap belt 10 and are released at the discharge end stably.
The through holes 12 for penetrating the screws or rivets are formed in the strip-shaped area opposite to the discharge module 7, the through holes 12 are uniformly distributed along the long side direction of the lap joint belt 10, and the through holes 12 penetrate through the adhesive film 11, the electrostatic discharge units 6 and the lower base body 5, so that the screws or rivets can penetrate conveniently. The number of vias 12 is specifically sized according to the dimensions of the electrostatic discharge device of the present invention to ensure reliability of the mounting.
Example 2
The embodiment provides a patch type electrostatic discharge device, which comprises an electrostatic discharge unit 6, wherein a substrate structure 3 is arranged on the upper surface and the lower surface of the electrostatic discharge unit 6, and an upper substrate 4 and a lower substrate 5 are adhered to the electrostatic discharge unit 6 through an adhesive film 11.
The base structure 3 is made of glass fiber composite material, the electrostatic discharge unit 6 comprises a discharge module 7 and a lap belt 10, and the discharge module 7 is made of polyimide.
The discharge module 7 has three discharge channels, a first discharge channel 71, a second discharge channel 72 and a third discharge channel 73, respectively. The first discharge channel 71 is flush with the aircraft structure trailing edge, the second discharge channel 72 extends 2mm beyond the aircraft trailing edge, and the third discharge channel 73 is centrally located in the U-shaped slot 2.
The discharge channels are ladder-shaped, the width of the discharge end is 3mm, the width of the part close to the lap belt 10 is 5mm, and the distance D between the adjacent discharge channels is 30mm.
One end of the discharge channel is a discharge end, and in order to ensure the stability of electrostatic discharge, the rectangular cross section of the discharge end is subjected to fillet treatment, and the chamfer is 2mm.
In order to avoid the structural discharge of the U-shaped groove 2 at the rear edge of the aircraft skin structure, the U-shaped groove 2 is subjected to fillet treatment, and the chamfer is 2mm.
There are 2 vias 12, the size of the vias 12 being 3mm in diameter.
The surface of the discharge module 7 is sprayed with electrostatic paint, the thickness of the electrostatic paint layer is 20-50 mu M, and the surface resistance is 1MΩ/≡100MΩ/≡. The strip-shaped region of the discharge module 7 is sprayed with conductive paint, so that the overlap resistance between the patch type electrostatic discharge device of the embodiment and the aircraft skin 1 is less than 100kΩ.
Example 3
The invention relates to a preparation method of a patch type electrostatic discharge device, which is used for preparing the patch type electrostatic discharge device and is implemented by the following steps:
step 1, engineering plastics are selected to prepare a discharge module 7;
step 1 comprises two preparation modes, wherein the first preparation mode is specifically implemented according to the following steps:
Step 1.1, injecting engineering plastic particles into a die cavity of a die through an injection molding machine at high pressure, wherein the injection molding temperature is 300-350 ℃, the injection molding pressure is 60-80 MPa, the injection molding time is 5-7 s, and the die is heated to 170-190 ℃ after injection molding is finished;
and 1.2, maintaining the pressure of the die for 10 s-20 s, and cooling the die to normal temperature to obtain the discharge module 7.
The second preparation method is to form the plastic piece of the electrostatic discharge unit 6 by adopting a machining mode according to the requirements of drawing paper and a digital model.
Step 2, spraying an electrostatic paint layer on the surface of the discharge module 7 to enable the surface resistance of the discharge module 7 to reach 1MΩ/≡100MΩ/≡; if the engineering plastic selected in the step 1 is added with the conductive factor and the surface resistance of the discharge module 7 reaches 1MΩ/≡100MΩ/≡, the step 3 is directly carried out;
In the step 2, spraying an electrostatic paint layer on the surface of the discharge module 7 is specifically implemented according to the following steps:
step 2.1, treating the surface of the discharge module 7 to clean and dry the surface of the discharge module 7;
2.2, spraying electrostatic paint on the surface of the discharge module 7 by using a spray gun, wherein the caliber of the spray gun is 1.0 mm-5 mm, the spraying pressure is 0.4 MPa-0.6 MPa, the spraying distance is 100 mm-300 mm, the spraying times are 5-7 times, and finally, an electrostatic paint layer with the thickness of 20 mu m-50 mu m is formed;
Step 2.3, placing the sprayed discharge module 7 in an oven at 150-170 ℃ for heating and curing, and taking out after curing is completed;
And 2.4, detecting the surface resistance of the discharge module 7 by using a surface resistance meter, and repeating the steps 2.2-2.3 if the surface resistance does not meet the requirement.
Step 3, arranging a lap belt 10 in a strip-shaped area of the discharge module 7 to form an electrostatic discharge unit 6;
Step 3 comprises two preparation methods, wherein the first preparation method is to spray conductive paint on the strip-shaped area of the discharge module 7 to form a lap belt 10, and the preparation method is specifically implemented according to the following steps:
Step 3.1, spraying conductive paint on the strip-shaped area of the discharge module 7 by using a spray gun, wherein the caliber of the spray gun is 1.0 mm-5 mm, the spraying pressure is 0.4 MPa-0.6 MPa, the spraying distance is 100 mm-300 mm, the spraying times are 5-7 times, and finally the conductive paint layer with the thickness of 20 mu m-50 mu m is formed;
and 3.2, placing the sprayed discharge module 7 in an oven at 150-170 ℃ for heating and curing, and forming the lap belt 10 after curing is completed.
The second preparation method is to paste a metal foil, a metal mesh, etc. on the strip-shaped region of the discharge module 7 to form the lap belt 10.
Step 4, sequentially bonding the adhesive film 11 and the substrate structure 3 on the upper and lower surfaces of the electrostatic discharge unit 6 to obtain a semi-finished product of the patch type electrostatic discharge device;
step 4 is specifically implemented according to the following steps:
Step 4.1, selecting glass fiber prepregs forming an upper substrate 4 and a lower substrate 5, wherein the glass fiber prepregs are required to be cut according to the shape of an electrostatic discharge unit 6; the glass fiber prepreg comprises resin and fiber, wherein the content of the resin is 30% -40%, and specifically, the types of the glass fiber prepreg are G07500, G10000, G12500, G15000, G17500 and G20000.
Step 4.2, bonding adhesive films 11 on the upper surface and the lower surface of the electrostatic discharge unit 6, so as to facilitate the bonding of the glass fiber prepreg and the surface of the electrostatic discharge unit 6;
Step 4.3, placing 3-10 layers of the glass fiber prepreg selected in the step 1 on the upper surface and the lower surface of the electrostatic discharge unit 6 respectively, then placing the electrostatic discharge unit 6 into a mould, and forming an electrostatic discharge device blank after curing;
Step 4.4, placing the die provided with the blank of the electrostatic discharge device into a vacuum bag, sealing, pumping out air in the vacuum bag through a vacuum pump, placing the vacuum bag into an autoclave for compression molding, wherein the heating temperature is 150-170 ℃, and the heat preservation time is 180min; can prevent amine curing agent in the prepreg from oxidizing and avoid uneven appearance and color of the finished product.
And 4.5, after the forming is finished, cooling to normal temperature at a speed of not more than 2 ℃/min, and taking out the blank of the electrostatic discharge device for surface repair to obtain a semi-finished product of the patch type electrostatic discharge device.
And 5, opening a through hole 12 on the semi-finished product of the patch type electrostatic discharge device at the position opposite to the lap joint belt 10 to obtain the patch type electrostatic discharge device.
Example 4
The embodiment provides a preparation method of a patch electrostatic discharge device, which is implemented according to the following steps:
And 1, preparing a discharge module 7 by using polyimide, doping 30% of carbon fibers in polyimide particles, closing a prepared mold, and injecting modified polyimide particles into a mold cavity by an injection molding machine to obtain the discharge module 7.
And 2, protecting the discharge channel, exposing only the strip-shaped area of the discharge module 7, spraying conductive paint on the strip-shaped area of the discharge module 7 by using a standard spray gun to form a conductive paint layer with the thickness of 20 mu m, and placing the sprayed discharge module 7 in a 160 ℃ oven for heating and curing to obtain the electrostatic discharge unit 6.
Step 3, selecting glass fiber prepreg, cutting into the size of 65mm multiplied by 105mm, adhering adhesive films 11 on the upper and lower surfaces of the electrostatic discharge unit 6, placing the glass fiber prepreg into a prepared mould, placing the electrostatic discharge unit 6 in the middle, and placing 5 layers of glass fiber prepreg on the upper and lower surfaces respectively to form an electrostatic discharge device blank;
And then placing the mould with the blank of the electrostatic discharge device into a vacuum bag, sealing, pumping out the air in the vacuum bag through a vacuum pump, wherein the vacuum degree is 0.1MPa, placing the vacuum bag into an autoclave, performing compression molding under the conditions of heating temperature 160 ℃ and heat preservation time 180min, and discharging after solidification is finished, reducing the temperature to 25 ℃ at a speed of less than or equal to 2 ℃/min. And taking the blank of the electrostatic discharge device out of the die, and performing surface repair to form a semi-finished product of the patch type electrostatic discharge device.
And 4, forming 2 through holes 12 with the diameter of 3.0mm on the semi-finished product of the patch type electrostatic discharge device to form the patch type electrostatic discharge device.
The discharge effect of the patch type electrostatic discharge device prepared in this example was tested, and as shown in fig. 6, the electrostatic discharge current was 21 μa at 40kV voltage, satisfying the requirement of not less than 10 μa.
Claims (8)
1. The patch type electrostatic discharge device is characterized by comprising an electrostatic discharge unit (6) composed of a discharge module (7) and a lap belt (10), wherein the discharge module (7) is comb-shaped as a whole, the lap belt (10) is arranged in a strip-shaped area of the discharge module (7), adhesive films (11) are adhered to the upper surface and the lower surface of the electrostatic discharge unit (6), and an upper base body (4) and a lower base body (5) are adhered to the upper surface and the lower surface of the electrostatic discharge unit (6) respectively through the adhesive films (11);
A plurality of through holes (12) are formed in the surface of the upper substrate (4) opposite to the strip-shaped area of the discharge module (7), the through holes (12) penetrate through the adhesive film (11), the electrostatic discharge unit (6) and the lower substrate (5), and the prepared patch type electrostatic discharge device does not protrude out of the surface structure of the aircraft body after being installed with the aircraft skin (1);
The discharging module (7) comprises a plurality of discharging channels, the discharging channels are arranged on the same side of the discharging module (7) to form a comb-shaped structure of the discharging module (7), the length L of each discharging channel is 50 mm-100 mm, and the width of each discharging channel is 3 mm-10 mm; the interval between the adjacent discharge channels is equal, and the interval between the adjacent discharge channels is not less than 30mm;
the plurality of through holes (12) are uniformly distributed along the long side direction of the lap belt (10).
2. The patch-type electrostatic discharge device according to claim 1, wherein the discharge channel has any one of a rectangular shape, a trapezoidal shape, a zigzag shape, and a cylindrical shape.
3. The patch-type electrostatic discharge device according to claim 1, wherein the surface resistance of the discharge module (7) is 1mΩ/≡100mΩ/≡.
4. A patch-type electrostatic discharge device according to any one of claims 1 to 3, wherein the shear strength of the adhesive film (11) is not less than 25MPa.
5. A method for manufacturing a patch-type electrostatic discharge device according to claim 4, comprising the steps of:
step 1, preparing a discharge module (7) by selecting engineering plastics;
Step 2, spraying an electrostatic paint layer on the surface of the discharge module (7) to enable the surface resistance of the discharge module (7) to reach 1MΩ/≡100MΩ/≡; if the engineering plastic selected in the step 1 is added with the conductive factor and the surface resistance of the discharge module (7) reaches 1MΩ/≡100MΩ/≡, directly performing the step 3;
Step 3, arranging a lap belt (10) in a strip-shaped area of the discharge module (7) to form an electrostatic discharge unit (6);
Step 4, sequentially bonding adhesive films (11), an upper substrate (4) and a lower substrate (5) on the upper surface and the lower surface of the electrostatic discharge unit (6) to obtain a semi-finished product of the patch type electrostatic discharge device;
Step 5, opening a through hole (12) on a semi-finished product of the patch type electrostatic discharge device at a position opposite to the lap joint belt (10) to obtain the patch type electrostatic discharge device;
The step 4 is specifically implemented according to the following steps:
step 4.1, selecting glass fiber prepregs forming an upper matrix (4) and a lower matrix (5);
step 4.2, bonding adhesive films (11) on the upper surface and the lower surface of the electrostatic discharge unit (6);
Step 4.3, placing 3-10 layers of the glass fiber prepreg selected in the step 1 on the upper surface and the lower surface of the electrostatic discharge unit (6), and then placing the electrostatic discharge unit (6) into a die to form an electrostatic discharge device blank after solidification;
Step 4.4, placing the die provided with the blank of the electrostatic discharge device into a vacuum bag, sealing, pumping out air in the vacuum bag through a vacuum pump, placing the vacuum bag into an autoclave for compression molding, wherein the heating temperature is 150-170 ℃, and the heat preservation time is 180min;
And 4.5, after the forming is finished, cooling to normal temperature at a speed of not more than 2 ℃/min, and taking out the blank of the electrostatic discharge device for surface treatment to obtain a semi-finished product of the patch type electrostatic discharge device.
6. The method for manufacturing a chip electrostatic discharge device according to claim 5, wherein the step 1 is specifically machining according to a drawing to obtain a discharge module (7) or performing the following steps:
Step 1.1, injecting engineering plastic particles into a die cavity of a die through an injection molding machine, wherein the injection molding temperature is 300-350 ℃, the injection molding pressure is 60-80 MPa, the injection molding time is 5-7 s, and the die is heated to 170-190 ℃ after injection molding is finished;
And 1.2, maintaining the pressure of the die for 10 s-20 s, and then cooling the die to normal temperature to obtain the discharge module (7).
7. The method for manufacturing the patch type electrostatic discharge device according to claim 5, wherein the spraying of the electrostatic paint layer onto the surface of the discharge module (7) in the step 2 is specifically performed according to the following steps:
step 2.1, treating the surface of the discharge module (7);
2.2, spraying electrostatic paint on the surface of the discharge module (7) by using a spray gun, wherein the caliber of the spray gun is 1.0 mm-5 mm, the spraying pressure is 0.4 MPa-0.6 MPa, the spraying distance is 100 mm-300 mm, the spraying times are 5-7 times, and finally, the electrostatic paint layer with the thickness of 20-50 mu m is formed;
2.3, placing the sprayed discharge module (7) in an oven at 150-170 ℃ for heating and curing, and taking out after curing is completed;
And 2.4, detecting the surface resistance of the discharge module (7) by using a surface resistance meter, and repeating the steps 2.2-2.3 if the surface resistance does not meet the requirement.
8. The method of manufacturing a chip electrostatic discharge device according to claim 5, wherein the step 3 is specifically to paste a metal foil or a metal mesh on a strip-shaped area of the discharge module (7) to form a lap belt (10) or to implement the following steps:
Step 3.1, spraying conductive paint on the strip-shaped area of the discharge module (7) by using a spray gun, wherein the caliber of the spray gun is 1.0 mm-5 mm, the spraying pressure is 0.4 MPa-0.6 MPa, the spraying distance is 100 mm-300 mm, the spraying times are 5-7 times, and finally the conductive paint layer with the thickness of 20 mu m-50 mu m is formed;
And 3.2, placing the sprayed discharge module (7) in an oven at 150-170 ℃ for heating and curing, and forming the lap joint belt (10) after curing is completed.
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| GB524912A (en) * | 1938-02-23 | 1940-08-16 | Bendix Aviat Corp | Method of discharging static electricity from bodies |
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| US3617805A (en) * | 1970-03-02 | 1971-11-02 | Dayton Aircraft Prod Inc | Low-noise static discharger device |
| CN102142430B (en) * | 2010-12-24 | 2012-12-26 | 深圳顺络电子股份有限公司 | Chip type high polymer electrostatic discharge protecting element and manufacturing method thereof |
| CN102522387A (en) * | 2011-12-21 | 2012-06-27 | 铜陵浩岩节能科技有限公司 | Static protector of surface mount component |
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| CN114671037B (en) * | 2022-05-30 | 2022-09-02 | 合肥航太电物理技术有限公司 | Electrostatic discharge brush and arrangement method |
| CN217456370U (en) * | 2022-08-22 | 2022-09-20 | 中国航空工业集团公司西安飞机设计研究所 | Airplane electrostatic discharger contraction layout device |
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