CN112226174B - Conductive foam adhesive tape with magnetostatic shielding function - Google Patents

Conductive foam adhesive tape with magnetostatic shielding function Download PDF

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Publication number
CN112226174B
CN112226174B CN202011107318.1A CN202011107318A CN112226174B CN 112226174 B CN112226174 B CN 112226174B CN 202011107318 A CN202011107318 A CN 202011107318A CN 112226174 B CN112226174 B CN 112226174B
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layer
boss
static magnetic
magnetic shielding
adhesive layer
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CN202011107318.1A
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CN112226174A (en
Inventor
林志武
高凌文
杨滨
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It Contains Up To Winged Intelligent Science And Technology Co ltd In Suzhou
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It Contains Up To Winged Intelligent Science And Technology Co ltd In Suzhou
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/29—Laminated material
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2400/00—Presence of inorganic and organic materials
    • C09J2400/10—Presence of inorganic materials
    • C09J2400/16—Metal
    • C09J2400/163—Metal in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2400/00—Presence of inorganic and organic materials
    • C09J2400/20—Presence of organic materials
    • C09J2400/24—Presence of a foam
    • C09J2400/243—Presence of a foam in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2475/00—Presence of polyurethane
    • C09J2475/006—Presence of polyurethane in the substrate

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

A conductive foam adhesive tape with a magnetostatic shielding function sequentially comprises the following components in sequence from top to bottom: the flexible circuit board comprises a static magnetic shielding layer, a first adhesive layer, a foaming base material, a second adhesive layer and a metal foil layer; a plurality of through holes are uniformly formed in the surface of the foaming base material, a boss is arranged at the upper end of each through hole, and the boss penetrates through the first adhesive layer and the static magnetic shielding layer; the boss comprises a first boss and a second boss which are stacked up and down, and the diameter of the second boss is larger than that of the first boss; a third adhesive layer is annularly arranged on the upper surface of the second boss; the upper surface of the first boss is connected with the through hole and is provided with a conductive material layer; the conductive material layer is connected with the metal foil layer; the invention has the basic functions of buffering, shock absorption and electrostatic shielding, has excellent static magnetic shielding effect and heat conduction effect due to the double-layer three-dimensional static magnetic shielding of the static magnetic shielding layer and the metal foil layer, has good electric conduction and electromagnetic shielding functions due to the existence of the metal foil layer, can flexibly select various adhesive materials, has simple structure and can be subjected to random die cutting.

Description

Conductive foam adhesive tape with magnetostatic shielding function
Technical Field
The invention belongs to the technical field of electronic application adhesive tapes, and particularly relates to a conductive foam adhesive tape with a magnetostatic shielding function.
Background
With the development of science and technology, the integration level and precision of electronic devices are higher and higher, and the requirements on electrostatic discharge and electromagnetic shielding of the electronic devices are gradually improved, so that higher requirements are provided for the quality and functionality of the conductive foam adhesive tape.
The conductive foam adhesive tape is conductive foam with an adhesive layer on the surface; the conductive foam adhesive tape is formed by wrapping and covering a foam base material with conductive materials such as conductive cloth and the like, and performing composite processing treatment to ensure that the conductive foam adhesive tape has good surface conductivity and can play roles in buffering, shock absorption, electromagnetic shielding, static electricity prevention and the like. Foamed substrates are generally required to have high elasticity and conformability to be suitable for applications requiring low closure forces and minimal amounts of compressive deformation. The conductive foam adhesive tape is widely applied to LCD displays, liquid crystal televisions, communication mobile terminal equipment and cabinets, household appliances, portable computers and the like.
In the traditional conductive foam tape, conductive cloth is fully coated on the surface of foam, or a metal or graphite layer is plated to form a conductive layer, so that good electrical conductivity and thermal conductivity are obtained.
At present, some conductive foam tape materials on the market have the following problems:
(1) most of all-round conductive foam tapes in China can only be attached by conductive pressure-sensitive adhesives, or conductive particles are added into hot melt adhesives and the like, so that the adhesiveness is influenced, the resilience of foam is also influenced to a certain extent, and the comprehensive performances such as cold resistance, durability and the like of the conductive pressure-sensitive adhesives are poor; in addition, since the conductive foam tape may be adhered to the surface of different materials, such as metal, PET, glass, etc., since the same adhesive often exhibits different viscosity to different materials, for example, the viscosity of the acrylic pressure sensitive adhesive to a PET plate is relatively low, there is a possibility that troubles in application may be caused by insufficient viscosity;
(2) the conductive foam adhesive tape attached by the conductive cloth has the problem of broken filaments during die cutting, so that the product yield and the die cutting efficiency are influenced; for the foam with the surface coated with the graphite layer, the foam has high compressibility, so that the phenomenon that the graphite layer is cracked and even peeled off easily occurs when the foam is greatly compressed during slitting;
(3) when the die cutting is carried out for multiple times, the electric conduction and heat conduction effects of the cut foam adhesive tape are possibly greatly reduced and even lost.
In addition, the current foam tape generally has the problems of not having static magnetic shielding function or weak static magnetic shielding function.
Magnetostatic shields are used in a wide variety of electronic devices, for example, leakage flux from transformers or other coils can contribute to electron motion and affect the focusing of the electron beam in an oscilloscope tube or a picture tube. In order to improve the quality of the instrument or product, it is necessary to perform magnetostatic shielding of the member generating the leakage magnetic flux.
The purpose of the static magnetic shielding is to prevent the external static magnetic field and the magnetic field of low-frequency current from entering a certain area to be protected, and a magnetic medium is required to be used as a shell. The static magnetic shielding can be achieved by adopting a material with high magnetic permeability to coat the electronic device. Disclosure of Invention
The invention aims to provide a conductive foam adhesive tape with good heat conduction, magnetostatic shielding and electromagnetic shielding effects.
The invention also aims to provide the conductive foam adhesive tape which can be subjected to random die cutting and can flexibly select various adhesive materials.
In order to solve the technical problem, the invention discloses a conductive foam adhesive tape with a magnetostatic shielding function, which sequentially comprises the following components from top to bottom: the static magnetic shielding layer, the first adhesive layer, the foaming base material, the second adhesive layer and the metal foil layer;
the surface of the foaming base material is uniformly provided with a plurality of through holes, the upper end of each through hole is provided with a boss, and the boss penetrates through the first adhesive layer and the static magnetic shielding layer;
the bosses comprise a first boss and a second boss which are stacked up and down, and the diameter of the second boss is larger than that of the first boss; a third adhesive layer is annularly arranged on the upper surface of the second boss;
the through hole penetrates through the middle part of the boss and the second adhesive layer and is connected with the metal foil layer;
the upper surface of the first boss is connected with the through hole and is provided with a conductive material layer; the conductive material layer is connected with the metal foil layer.
Preferably, the upper surface of the third adhesive layer is slightly lower than the upper surface of the magnetostatic shield layer, and the upper surface of the first boss is slightly higher than the upper surface of the magnetostatic shield layer.
Preferably, the through-holes are arranged vertically or obliquely.
Preferably, the magnetostatic shield layer is made of a high-permeability material including one of steel, iron and an alloy thereof.
Preferably, the materials of the first adhesive layer, the second adhesive layer and the third adhesive layer include pressure-sensitive adhesive or hot melt adhesive, and the materials of the first adhesive layer, the second adhesive layer and the third adhesive layer are the same or different.
Preferably, the metal foil layer material is an aluminum foil.
Preferably, the conductive material layer is one of a metal plating layer, a graphite plating layer and conductive ink.
Preferably, the boss is in a stepped semi-conical shape or a stepped columnar shape.
Preferably, the bottom of the through hole is trumpet-shaped; or 1-3 gaps are arranged on the side wall of the bottom of the through hole and used as contact points for connecting the conductive material layer and the metal foil layer.
Preferably, the first boss, the second boss and the foam base material are integrally molded.
The conductive foam adhesive tape with the magnetostatic shielding function at least has the following advantages:
1. the conductivity and the like of the adhesive do not need to be considered, various adhesive materials can be flexibly selected, the adaptability and the durability of the product are improved, and the production cost is further reduced.
2. The adhesive tape can be cut at will, so that the finished adhesive tape can be cut at any specification as required, and the condition that the electric conduction and heat conduction effects of the adhesive tape are greatly reduced or lost due to cutting does not exist.
3. Besides the basic functions of buffering, damping and electrostatic shielding, the double-layer three-dimensional magnetostatic shielding with the magnetostatic shielding layer and the metal foil layer has excellent magnetostatic shielding effect and heat conduction effect, and in addition, the metal foil layer has excellent functions of electric conduction and electromagnetic shielding.
Drawings
Fig. 1 is a schematic structural diagram of a conductive foam tape with a magnetostatic shielding function.
Fig. 2 is a schematic structural diagram of another conductive foam tape with a magnetostatic shielding function.
The reference signs are: 1-magnetostatic shielding layer, 2-first adhesive layer, 3-foaming base material, 4-second adhesive layer, 5-metal foil layer, 6-boss, 610-first boss, 620-second boss, 630-third adhesive layer, 7-through hole, 8-conductive material layer, 9-notch and 10-release film.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," when used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Example 1
As shown in fig. 1, a conductive foam tape with magnetostatic shielding function comprises, from top to bottom: the flexible circuit board comprises a static magnetic shielding layer 1, a first adhesive layer 2, a foaming base material 3, a second adhesive layer 4 and a metal foil layer 5;
a plurality of through holes 7 are uniformly formed in the surface of the foaming base material, a boss 6 is arranged at the upper end of each through hole, and the boss penetrates through the first adhesive layer and the static magnetic shielding layer;
the bosses comprise a first boss 610 and a second boss 620 which are stacked up and down, and the diameter of the second boss is larger than that of the first boss; a third adhesive layer 630 is annularly arranged on the upper surface of the second boss; the third adhesive layer plays a main role in enabling the conductive foam adhesive tape to be adhered to the surface of the electronic device, no adhesive is arranged between the static magnetic shielding layer and the electronic device, high heat conduction efficiency between the static magnetic shielding layer and the electronic device can be guaranteed, materials are saved, and corrosion or adhesion damage of the adhesive to the surface of the electronic device is reduced.
The through hole penetrates through the middle part of the boss and the second adhesive layer and is connected with the metal foil layer;
the upper surface of the first boss is connected with the through hole and is provided with a conductive material layer 8; the conductive material layer is connected with the metal foil layer. Through the arrangement, the metal foil layer is communicated with the surface of the electronic device, so that the electrostatic shielding effect is achieved.
The upper surface of the third adhesive layer is slightly lower than the upper surface of the static magnetic shielding layer, and the upper surface of the first boss is slightly higher than the upper surface of the static magnetic shielding layer. When the conductive foam adhesive tape with the static magnetic shielding function is adhered to the surface of an equipment, the third adhesive layer is adhered to the surface of the equipment and jointly presses the first boss and the static magnetic shielding layer, so that the first boss, the static magnetic shielding layer and the third adhesive layer are kept on the same plane, on one hand, the first boss is in close contact with the surface of an electronic device, good conductivity is ensured, on the other hand, the static magnetic shielding layer is kept in contact with the surface of the electronic device, and the heat conduction efficiency is improved.
The through holes are vertically arranged.
The static magnetic shielding layer is made of a high-permeability material and comprises one of steel, iron and an alloy thereof.
The materials of the first adhesive layer, the second adhesive layer and the third adhesive layer comprise pressure-sensitive adhesive or hot melt adhesive, and the materials of the first adhesive layer, the second adhesive layer and the third adhesive layer are the same or different. Due to the existence of the conductive material layer, a better conductive effect can be achieved; therefore, the requirements on the conductivity and the like of the first adhesive layer, the second adhesive layer and the third adhesive layer are reduced or no conductivity is required, and manufacturers can select different adhesives according to different application requirements so as to solve the problems of poor durability and cold resistance and the like caused by the fact that acrylic pressure-sensitive adhesives are adopted only.
The metal foil layer material is aluminum foil. The aluminum foil has good electrical conductivity and high magnetic conductivity, and is protected by double layers together with the static magnetic shielding layer, so that an excellent static magnetic shielding effect is achieved.
The conductive material layer is one of a metal coating, a graphite coating and conductive ink. In this example, a vacuum graphite plating layer was used.
The boss is in a stepped column shape.
Or the side wall of the bottom of the through hole is provided with 2 gaps 9, and the conductive material layer extends into the gaps and is used as a contact point or a pin for connecting the conductive material layer and the metal foil layer. The horn shape or the gap is arranged at the bottom of the through hole to increase the contact area between the bottom of the through hole and the metal foil layer and ensure the conductive effect.
The first boss, the second boss and the foaming base material are integrally formed. In this embodiment, the foaming substrate may be formed by one-step foaming of polyurethane foam or by two-step hot-pressing of polyurethane foam with a flat surface, and the through hole is formed by one-step processing of a punch.
In addition, during packaging, a release film 10 is covered on the surface of the conductive foam adhesive tape close to the boss.
Example 2
Similarly to embodiment 1, the difference is that the through-holes are arranged obliquely. The through hole that the slope set up has better adaptability to the compression deformation of foaming substrate, the phenomenon that the conducting material layer peeled off and drops in the prevention die cutting or long-term use that can be better.
Example 3
As shown in fig. 2, similar to example 1, except that the gap 9 serving as a contact point is not included, the conductive material layer includes conductive ink poured into the first through hole and conductive ink coated on the surface of the land.
While embodiments of the invention have been described above, it is not intended to be limited to the details shown, particular embodiments, but rather to those skilled in the art, and it is to be understood that the invention is capable of numerous modifications and that various changes may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.

Claims (8)

1. A conductive foam adhesive tape with a magnetostatic shielding function is characterized by comprising the following components in sequence from top to bottom: the static magnetic shielding layer, the first adhesive layer, the foaming base material, the second adhesive layer and the metal foil layer;
the surface of the foaming base material is uniformly provided with a plurality of through holes, the upper end of each through hole is provided with a boss, and the boss penetrates through the first adhesive layer and the static magnetic shielding layer;
the bosses comprise a first boss and a second boss which are stacked up and down, and the diameter of the second boss is larger than that of the first boss; a third adhesive layer is annularly arranged on the upper surface of the second boss;
the through hole penetrates through the middle part of the boss and the second adhesive layer and is connected with the metal foil layer;
the upper surface of the first boss is connected with the through hole and is provided with a conductive material layer; the conductive material layer is connected with the metal foil layer;
the upper surface of the third adhesive layer is slightly lower than the upper surface of the static magnetic shielding layer, and the upper surface of the first boss is slightly higher than the upper surface of the static magnetic shielding layer;
the materials of the first adhesive layer, the second adhesive layer and the third adhesive layer comprise pressure-sensitive adhesive or hot melt adhesive, and the materials of the first adhesive layer, the second adhesive layer and the third adhesive layer are the same or different.
2. A static magnetic shielding-function conductive foam tape according to claim 1, wherein said through-hole is provided vertically or obliquely.
3. The static magnetic shielding conductive foam tape according to claim 2, wherein the static magnetic shielding layer is made of a high magnetic permeability material including one of steel, iron and alloys thereof.
4. A static magnetic shielding-capable blister tape according to claim 1, wherein the metal foil layer material is aluminum foil.
5. The static magnetic shielding conductive foam tape according to claim 4, wherein the conductive material layer is one of a metal plating layer, a graphite plating layer, and a conductive ink.
6. A static magnetic shielding conductive foam tape according to claim 5, wherein said projection is in the shape of a stepped half cone or a stepped column.
7. A static magnetic shielding conductive foam tape according to claim 1, wherein the bottom of the through hole is trumpet-shaped; or 1-3 gaps are arranged on the side wall of the bottom of the through hole and used as contact points for connecting the conductive material layer and the metal foil layer.
8. A static magnetic shielding-function conductive foam tape according to claim 1, wherein the first boss, the second boss and the foam base material are integrally formed.
CN202011107318.1A 2020-10-16 2020-10-16 Conductive foam adhesive tape with magnetostatic shielding function Active CN112226174B (en)

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Application Number Priority Date Filing Date Title
CN202011107318.1A CN112226174B (en) 2020-10-16 2020-10-16 Conductive foam adhesive tape with magnetostatic shielding function

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Application Number Priority Date Filing Date Title
CN202011107318.1A CN112226174B (en) 2020-10-16 2020-10-16 Conductive foam adhesive tape with magnetostatic shielding function

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CN112226174B true CN112226174B (en) 2022-06-17

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103666302B (en) * 2013-04-23 2015-06-24 隆扬电子（昆山）有限公司 Production method of high conductivity rubber elastomer
CN210491555U (en) * 2019-09-08 2020-05-08 山东天厚新材料科技有限公司 Novel electromagnetic pulse protection shielding belt
CN210694780U (en) * 2019-09-14 2020-06-05 山东天厚新材料科技有限公司 Permalloy low-frequency electromagnetic field shielding belt
CN110519980B (en) * 2019-09-16 2020-12-22 深圳市丰正昌精密科技有限公司 Electromagnetic shielding conductive foam and preparation method thereof

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