KR19990079386A - Adhesive tape with electromagnetic shielding function - Google Patents

Abstract

The present invention relates to a pressure-sensitive adhesive tape having an electromagnetic wave blocking function used to block electromagnetic waves emitted to the outside during operation in a cathode ray tube, a mobile phone, a computer, an electronic game machine, a car, and the like, which are used in a video apparatus such as a television. will be.

The tourmaline is contained in the pressure-sensitive adhesive layer of the adhesive tape, which is already used to assemble electronic devices, so that 5 to 40wt% of the weight of the pressure-sensitive adhesive is used to convert electromagnetic waves emitted from electronic devices into thermal energy using the electrical characteristics of the tourmaline. The present invention relates to a pressure-sensitive adhesive tape for suppressing the release of fluoride.

Description

Adhesive tape with electromagnetic shielding function

The present invention relates to a pressure-sensitive adhesive tape having an electromagnetic wave blocking function used to block electromagnetic waves emitted to the outside during operation in a cathode ray tube, a mobile phone, a computer, an electronic game machine, a car, and the like, which are used in a video apparatus such as a television. will be.

Electromagnetic waves are a phenomenon in which vibrations of an electromagnetic field propagate at a wavelength, that is, a periodic change of an electric field and a magnetic field are propagated as a wave, which is also a kind of energy.

An electric field and a magnetic field exist at the same time with each other, and the energy that they have is called electromagnetic energy.

As electronic products maintain a close relationship with daily life, obstacles to human health due to electromagnetic waves are gradually becoming a social problem, and leading companies in the world block or neutralize electromagnetic waves generated from various electronic products. There is a lot of research into how to do this. According to which part of the human body the electromagnetic wave passes through, the effect on the bioenergy to maintain the human health is said to be different. Therefore, among the world's leading companies, they are conducting research competitively with the idea that if they can convert the electromagnetic energy harmful to the human body into energy that maintains human health, it will be a very useful solution to the problem of electromagnetic interference. will be.

Current well-known electromagnetic wave measurement data indicates that the driver's seat and the rear seat near the device that controls the suspension of a car are affected by electromagnetic waves, and the accelerator (accelerator) part receives strong electromagnetic waves of 100 mg (Mili Gauss) or more. .

Cell phones also emit electromagnetic waves of 100 mg or more, and the seats of high-speed trains such as Japan's "Shinkansen" and France's "Tejebe" (TGV) are also affected by electromagnetic waves of 100 mg or more, as are computers, electronic game machines, and stereos. The long-term users of machines and devices feel headaches, fatigue, etc., and it is estimated that these effects of electromagnetic waves. Therefore, research is being actively conducted on how to block or convert the harmful electromagnetic waves into other energy. One example of this is the control of the electron beam deflection from the part where the electron gun is installed in the CRT. A metal plate made of amorphous magnetic alloy is attached to the outer surface of the CRT on the part where the electromagnet (deflection yoke) is installed, and the front part of the CRT is coated with a conductive material such as carbon to emit electromagnetic waves from the CRT. There is an attempt to block.

In this case, the reason for using an amorphous magnetic alloy plate is that when an electromagnetic wave emitted from the electron gun collides with the amorphous magnetic alloy plate, a magnetic field is formed, and the electromagnetic wave does not penetrate the magnetic field. The electromagnetic waves are converted into other energy, such as inferior, to prevent the electromagnetic waves from radiating to the outside.

However, the amorphous magnetic alloy plate is not only a very expensive new material but also greatly increases the weight of the CRT itself.

The present invention relates to an adhesive tape having an electromagnetic wave blocking function.

Adhesive tape is used in many parts to fix parts used in assembling CRT, mobile phones, medical devices, and electronic game machines.

The adhesive tape serves to fix the Braun tube when assembling a video device such as a television, or to remove static electricity that is accumulated on the outer surface of the Braun tube or to deflect the electron beam. It is not only used to attach magnets to control the outer surface of the CRT, but also widely used in the assembly process of automobiles, mobile phones, and electronic products.

Conductive adhesive tape is used to conduct the static electricity. Conductive adhesive tape also provides conductivity by incorporating the conductive metal powder into the adhesive layer or by forming the coating layer from the conductive material.

The reason for using adhesive tape when assembling CRT is because CRT is made of glass and the inside is vacuumed and can be damaged by external shock. Therefore, it is not possible to fix it directly to the casing or housing, but to fix the metal bracket to the outer circumference of CRT using adhesive tape. Then use this bracket to secure it to the casing or housing.

Thus, by fixing the CRT to the bracket by using a pressure-sensitive adhesive tape, it is possible to prevent breakage of the CRT and to minimize the scattering range of the fragments even when the CRT explodes by an external impact or accident.

The present invention relates to a tourmaline-containing pressure-sensitive adhesive tape containing a tourmaline powder having an electromagnetic wave blocking function in the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape in the process of manufacturing the pressure-sensitive adhesive tape.

Tourmaline is a boron-containing cyclosilicate mineral that has a unique crystal structure and thus charges itself in its natural state, and is named as tourmaline in Korea. The tourmaline chemical composition is as follows.

XY ₉ B ₃ Si ₆ O ₂₇ (O.OH.F) ₄

Here, X is any one or at least one of Ca, Na, K, Mn, and Y is any one or more of Mg, Fe, Al, Cr, Mn, Ti, Li.

More specifically, (Na · Ca) (Li · Mg · Fe · Al) ₃ (Al · Fe) ₆ (BO ₃ ) ₃ (Si ₆ O ₁₈ ) (O · OH · F) ₄ , It is called schol and has both piezoelectricity and pyroelectricity characteristics.

Piezoelectricity refers to a phenomenon in which symmetrical crystals exhibit electrical polarization at both ends of a specific direction when pressure is applied in a specific direction to a defective crystal at the center of symmetry. .

Pyroelectric refers to a phenomenon in which charges of different properties are shown at both ends of a polar axis when a temperature change is applied to a crystal having a polar axis.

The reason why tourmaline shows both piezoelectric and pyroelectric characteristics is as follows. Tourmaline crystals are made of crystal lattice Wow It is an ion crystal with a charge of.

Like crystals, crystal lattice of general ionic crystals are very regularly aligned and assembled, whereas tourmaline crystal lattice is assembled to be distorted. This phenomenon is called self-distortion, and the distortion of the lattice point in the charged ionic crystal distorts the lattice vibration pattern of the lattice, resulting in the release of symmetrical lattice vibration. The effect is that it is not electrically neutral on the outside and has the opposite charge on the anode.

The electrical properties also change with temperature changes. In the case of tourmarine, the temperature drops sharply at about 700 ° C., but the electric properties are completely lost at 1000 ° C. or higher.

This is because the spontaneous phenomena of the spontaneous heat disappears at high temperatures. Tourmaline has the above electrical properties between absolute temperatures of 0 ° and 1000 ° C.

In general, when a dielectric, which is a polar crystal, is placed on an electric field, electric polarization occurs. That is, on different poles Charge and Will be charged Charge and The charge is always unbalanced and in an unstable state. This unbalance state is called a potential difference, and because of this potential difference At the pole Electrons move to the poles, and the flow of electrons is called static electricity, and crystals that exhibit this polarization continue to generate static electricity.

On Earth, electromagnetic waves are continuously emitted from the sun to Earth The current (chariot) is the tourmaline Flowing to the poles, the tourmaline is permanently generating electricity as long as there is the sun. Tourmaline with permanent electrodes exhibits 5.3 volts and 0.06 milliamps of current at 2 cm ³ , but shows higher voltages at finer particles and about 100 volts at 325 mesh.

An object of the present invention is to configure the tourmaline to contain 5 to 40wt% of the weight of the pressure-sensitive adhesive in the pressure-sensitive adhesive layer of the adhesive tape that is already used to assemble the electronic devices by using the electrical properties of the tourmaline to emit electromagnetic waves It is to provide a pressure-sensitive adhesive tape to convert the heat energy to suppress the emission of electromagnetic waves.

1 is a cross-sectional view of the adhesive tape of the present invention.

Explanation of symbols on the main parts of the drawings

1. Adhesive 2. Tourmaline fine powder 3. Fiber cloth

4. Conductive or non-conductive coating 5. Release paper or release agent

An object of the present invention is to apply the electrical characteristics of the tourmaline to the adhesive tape used in the assembly of the machine and the machine that emits electromagnetic waves, thereby preventing the electromagnetic waves from being emitted from electronic devices or converting them into other energy.

Electromagnetic waves emitted from electronic devices, etc. Of the tourmaline in the adhesive tape When flowed to the poles, electromagnetic waves are absorbed by the tourmaline, and the tourmaline generates electricity. At this time, the amount of current generated in the tourmaline was a weak current of most amperes. Tourmaline is an insulator for electricity, so the current generated is converted into thermal energy and released to the outside. Eventually, since electromagnetic waves emitted from electronic devices are converted into thermal energy, it is possible to block generation of electromagnetic waves harmful to the human body.

The present invention will be described in detail with reference to the following Examples.

Example

As shown in FIG. 1, the adhesive tape for fixing the CRT is composed of an adhesive (1) layer, a fiber mesh (3) layer, a conductive or non-conductive coating (4) layer, a release paper or a release agent (5) layer as a basic component. When conductivity is required, the adhesive layer is formed of a conductive adhesive or a conductive film layer such as an aluminum thin film is attached to impart conductivity. As the non-conductive film 4 layer, a synthetic resin film made of polyester resin, polyethylene resin or polypropylene resin is used.

According to the present invention, the pressure-sensitive adhesive layer is mixed with a well-known acrylic resin-based pressure-sensitive adhesive based on the amount of solids other than the solvent in the pressure-sensitive adhesive to form a pressure-sensitive adhesive by mixing 5 to 40 wt% of tourmaline fine powder of 325 mesh or more, and using the pressure-sensitive adhesive. To prepare an adhesive tape.

Composition example of pressure-sensitive adhesive

Acrylic resin adhesive (solid content 40%): 100 parts by weight

Average particle size 325 mesh tourmaline powder: 20 parts by weight

The acrylic resin adhesive of 40% of solid content says the adhesive which melt | dissolved 40 weight% of acrylic resin in 60 weight% of solvents.

The components are mixed uniformly to form an adhesive.

After applying the above-mentioned acrylic pressure-sensitive adhesive containing tourmaline fine particles (2) on about 65 neck fiber cloth 3 laminated on a conductive or non-conductive film (4) layer, the solvent is completely volatilized in a drying apparatus. (1) A layer is formed.

When the tensile strength of the adhesive tape is not required, the adhesive tape may be manufactured by directly forming the adhesive (1) layer on the conductive or non-conductive film (4) layer without the fiber mesh, in which case the adhesive tape has a thickness of about 50 to 150 μm. It can also be made very thin.

The fibrous mesh may be made of glass fibers, polyester fibers, acrylic fibers, cotton fibers or nylon fibers, or a blended fiber mesh cloth in which these fibers are fused together. Moreover, rubber type resin can also be used instead of acrylic resin as an adhesive component.

The current generated by attaching the adhesive tape to an arbitrary part as necessary in order to neutralize and absorb the electromagnetic waves emitted from the electron gun portion of the CRT to the whole CRT outside of the CRT on the adhesive tape having a thickness of 30 μm after drying. As a result of measuring the size of, it was a weak current of 0.06 milliampere, but the external emission of electromagnetic waves decreased by 80%.

The conductive adhesive tape of the present invention can be very usefully used for fixing the CRT and removing static electricity accumulated in the CRT through the CRT when the CRT is fixed using a metal bracket.

Conventionally, in order to remove static electricity accumulated in the outer edge of the CRT, the CRT adhesive tape uses a conductive adhesive tape. However, tourmaline also removes static electricity accumulated on the outer edge of the CRT, such as conductive adhesive tape, due to its non-conductive minerals and its electrical properties.

In order to prevent static electricity or electromagnetic waves from radiating to the outside of the conventional electronic products, conductive materials such as carbon or metal powder are coated or metal plates such as amorphous magnetic alloys are used.

However, it is possible to remove static electricity by the method of forming the coating layer with the conductive material, but it could not block the electromagnetic waves, and the amorphous magnetic alloy is not only an expensive new material itself but also the weight of electronic products that seeks to be lightweight. It is accompanied by a fatal flaw that increases the

Since adhesive tape is already used for fixing parts when assembling electronic products, the present invention contains tourmaline having electrical properties to block electromagnetic waves, so it does not incur a burden in terms of production cost or light weight. By attaching the adhesive tape of the present invention in an arbitrary form to a portion where electromagnetic waves harmful to human health are emitted to the outside, it is possible to neutralize and suppress the emission of electromagnetic waves.

Claims (2)

A pressure-sensitive adhesive tape composed of a conductive or non-conductive coating layer, a fiber mesh layer, and a pressure-sensitive adhesive layer, wherein the pressure-sensitive adhesive tape is made to contain 5 to 40 wt% of tourmaline fine powder. The pressure-sensitive adhesive tape according to claim 1, wherein the fibrous mesh layer is a mesh cloth made of glass fibers, polyester fibers, acrylic fibers, cotton fibers or nylon fibers or a mixed fiber mesh cloth selected from the fibers and mixed.