KR20050053040A - Emi/emc shielding sheet and the method for making it - Google Patents

Abstract

The present invention relates to an electromagnetic shielding sheet (EMI / EMC Shielding Sheet) composition, and to a method for manufacturing and application thereof, comprising a composition of a conductive metal powder, a conductive polymer powder, an organic binder, the organic binder is polyvinyl chloride ( Polyvinyl chloride, Nitrocellulose, Dioctyl phthalate, Dibutyl phthalate, Phosphate esther, Toluene, Methyl Ehtyl Ketone, Acetic acid Consisting of ethyl ester (Acetic acid ethyl ester), or UV Curing type polyester resin (UV Curing type Polyester resin), photoinitiator (Initiator) and the like, the conductive sheet composition manufacturing method is 15 ~ 45rpm in the ball mill 8 ~ After the slurry was prepared by milling for 18 hours, the prepared slurry was molded and dried on a carrier film by a doctor blade method. Or molding into various forms by dispensing, extruding, tape casting, molding, screen printing, and manufacturing a conductive electromagnetic shielding sheet by a UV curing machine.

Description

Conductive sheet composition for electromagnetic wave shielding and manufacturing method thereof {EMI / EMC shielding sheet and the method for making it}

The present invention relates to an electromagnetic shielding sheet (EMI / EMC Shielding Sheet) composition for effectively blocking electromagnetic waves (EMI / EMC shielding sheet) composition and a method of manufacturing the same, more specifically, conductive metal powder (or conductive polymer powder) such as silver, copper The present invention relates to a conductive sheet composition for shielding electromagnetic waves and to a method of manufacturing the same, which can effectively block electromagnetic waves by mixing and using an organic binder.

The recent development of scientific civilization has provided many conveniences to human life. In particular, the development of electrical, electronic and communication-related devices play a part in making our lives more convenient and profitable. The scientific civilization, which provides convenience to humans, has both sides which may be good or bad depending on how and where it is used.

One of the latest scientific literature that harms humans is electromagnetic waves. From power generation and transmission, radio and television and telephone communications, microwave ovens, ovens, and space exploration on airplanes and ships, everything is unimaginable. As technology develops, electronics will pour and electromagnetic waves will increase.

Even now, electromagnetic waves wander around us as colorless and odorless, like the air we breathe. However, these electromagnetic waves, which are indispensable to humans, are also called electromagnetic interference (EMI), which disturbs other electromagnetic waves, causing malfunction of various machines, causing industrial accidents, and directly or indirectly affecting the human body. .

In addition, efficiency and shortening of lifespan of internal electronic products by the high voltage generator of automobiles, mutual disturbance between electronic equipments, glaucoma, which can be caused by long-term exposure to microwaves of the human body, and a decrease in fertility may be mentioned. . The space inhabited by modern people is no longer a safe zone from electromagnetic waves, and as scientific civilization develops, its seriousness will increase.

The human body has a microscopic electronic signaling system that enables mechanisms of emotion regulation, memory, and behavior. Pregnancy, childbirth, illness and stress in human history would be shocking if they were never related to electromagnetic waves, but that is true. Under these circumstances, advanced countries such as the United States, Japan, and Russia have established safety exposure standards for electromagnetic waves to strongly regulate external exposure, and continue to study the harmfulness of electromagnetic waves.

In particular, more than 20 countries have already been developed in advanced countries in order to maintain the high-quality information and minimize the impact on the electromagnetic interference (EMI), which is derived in proportion to the rapidly increasing information and communication age in the 21st century. EMI has been regulated since lately, and in recent years, it has actively coped with protecting electromagnetic environment by forcing electromagnetic wave immunity.

In general, when a metal is used as a base material of a conventional EMI material, a polymer material is mainly used as a binder concept. Although it is used as a non-crosslinking type or a crosslinking type, the EMI material has a metal content of more than 70wt%, so that the composite which is simply mechanically mixed or blended (particularly in the case of thermoplastic) has almost no physical property ( Elongation rate 100% -0%), heat resistance is also very poor.

In the case of the crosslinking type, the heat resistance is improved, but since the metal and the polymer are basically in a state of mechanically mixing, there is a problem in that the physical properties of the material are not good, so that the basic physical properties of shielding the electromagnetic waves cannot be continuously maintained, but hardened or decomposed.

Accordingly, an object of the present invention is to solve the problems of the prior art, and to provide a composition of a conductive sheet having excellent electrical conductivity and a method of manufacturing the same using an organic binder having low manufacturing cost and good fluidity and dispersibility.

Particularly, in the present invention, as the conductive sheet is manufactured using the organic binder composition, the dispersibility and tensile strength, peeling property, flexibility, and electrical conductivity characteristics are made to be superior to those of the prior art, and pinholes on the conductive sheet are also improved. It rarely occurs.

On the other hand, when using UV curable resin (Resin) as an organic binder (Organic Binder) has a characteristic that the curing speed is fast and high productivity, there is almost no shrinkage phenomenon in the case of the conductive sheet (Sheet) using the same, resulting in defects It is not possible to make it widely available industrially.

The present invention relates to an organic binder (Binder) composition and manufacturing method of the electromagnetic shielding sheet (EMI / EMC Shielding Sheet), it is possible to obtain an excellent electromagnetic shielding effect according to the composition change of the binder and the content ratio of each component, Various kinds of metal powders (Metal powder) or conductive polymer (conducting polymer) is included together to excellent dispersibility.

In particular, when using a UV curable resin (Resin) as an organic binder (Organic Binder) has a characteristic that the curing speed is fast and high productivity, the conductive sheet (Sheet) manufactured using this has almost no shrinkage phenomenon, resulting in defects Since it does not occur, various characteristics are excellent.

Electromagnetic shielding conductive sheets are generally organic polymer resin (Polymer resin) which is added to give bonding strength between organic solvents with high volatile temperature and adherend, conductive metal powder which gives electric conductivity and determines electromagnetic shielding efficiency (or Conductive polymer) as a main component.

Electromagnetic shielding sheet for the electromagnetic wave is currently a situation that almost depends on the import and therefore domestic technology is also very weak situation.

Electromagnetic shielding conductive sheet shows a lot of difference in adhesiveness, durability and change with time due to the dispersibility and physicochemical properties of organic binders. Therefore, the influence on the electrical properties and the electromagnetic shielding effect of the conductive sheet is large.

Electromagnetic shielding conductive sheet according to the present invention is a doctor blade method comprising a slurry composed of 30 to 70% by weight of metal and ceramic dielectric or magnetic powder and 30 to 70% by weight of an organic binder (Doctor blade method) Or cast 1.0-15.0 wt.% Of conductive metal powder, 15.0-70.0 wt.% Of UV curing type resin, and 15.0-84.0 wt.% Of conductive polymer powder. It is prepared by mixing in a planetary mixer and milling the mixed paste by three or more passes through a 3-roll mill.

The organic binder determines the fluidity and dryness of the paint, and determines the dispersibility of the conductive metal powder and the properties of the metal thin sheet or film.

If the dispersibility of the metal powder is poor, the fluidity of the slurry is poor, so it is not suitable for spraying and casting, and if the viscosity of the slurry is not appropriate, variation of the thin film sheet and film thickness during casting, pinhole of the sheet ) And streaks occur.

In addition, even when spraying, a uniform metal film may not be formed by spraying. Since the poor physical properties of the electromagnetic wave shielding paint are poor due to the inappropriate binder properties, selection of a good organic binder is important, and since the conductive metal powder ultimately determines the electromagnetic wave shielding efficiency, the selection and specification of the metal powder It is also a very important factor.

The organic binder according to the present invention allows the slurry to have a proper fluidity, physicochemical and thermal properties to form a good coating film during coating by sprayer and spin-coating, and casting. Satisfies the good flexibility, tensile strength, and stripping characteristics of the carrier film when the sheet or film is manufactured.

Hereinafter, the present invention will be described in more detail with reference to Examples.

The electromagnetic shielding sheet composition of the present invention is composed of 30.0-70.0% by weight of the metal powder (or ceramic dielectric, magnetic material) and 30.0-70.0% by weight of the organic binder.

The metal powder may be any one or a mixture of conductive inorganic metals such as silver (Ag), copper (Cu), silver coated copper, nickel (Ni), aluminum (Al), tin (Sn), and zinc (Zn). The conductive metal powders may be in the form of a flake type, a spherical type, an amorphous type, or a mixture of one or more thereof.

As the metal powder, silver powder having excellent electrical conductivity is mainly used. Silver (Ag) powder is manufactured by conventional coprecipitation well known in the art, and has a tap density of 2.9-3.9 g / cc and a specific surface area of 0.7-1.3 m ² / g is used.

In addition, the composition of the organic binder in the present invention is as follows to improve the fluidity and sheet drying properties of the slurry composition, the dispersibility of the metal powder and ceramic powder, the overall sheet properties, peeling properties Have the same composition.

Polyvinyl chloride: 8.0-13.0 wt%

Nitrocellulose: 5.0-10.0 wt%

Dioctyl phthalate: 4.0-6.0 wt%

Dibutyl phthalate: 2.0-4.0 wt%

Phosphate ester: 0.5-1.0 wt%

Toluene: 40.0-62.5 wt%

Methyl Ethyl Ketone: 8.0-10.0 wt%

Acetic acid ethyl ester: 10.0-15.0 wt%

First, each component of the organic binder having the above composition is weighed, and these weighed raw materials are placed in a stainless steel container and completely dissolved while stirring with an emulsifier to prepare an organic binder.

The organic binder prepared as described above was weighed at a composition ratio of 30.0-70.0 wt% and the silver powder prepared by the coprecipitation method, and placed in a jar for ball mill to 15 by a ball mill machine. -Mill for 8-18 hours at 45 rpm. After milling, the present invention is formed by forming a conductive metal electromagnetic shielding sheet having a desired thickness on a carrier film by a doctor blade method by connecting to a caster, which is automatically supplied with slurry through a slurry container. The electrically conductive sheet by the organic binder composition of this is obtained.

Table 1 shows the characteristics of the conductive silver (Ag) powder and the slurry prepared therefrom used in the present invention.

Silver (Ag) Powder Slurry composition Furtherance Flake type silver powder Solid State (%) 30.0-70.0 ± 1.0 Surface area (m ² / g) 0.7 to 1.3 Viscosity (RVT, # 3, RPM20, cps) 1000-3000 ± 300 Tap Density (g / cc) 2.9 to 3.9 Specific gravity (g / cc) 2.0 to 7.0

Hereinafter, a comparative example is described together with the specific Example of this invention.

Example 1

a. Composition (% by weight)

<Organic Binder Composition>

Polyvinyl chloride: 8.0%

Nitrocellulose: 6.0%

Dioctyl phthalate: 4.0%

Dibutyl phthalate: 2.0%

Phosphate esther: 0.5%

Toluene: 61.5%

Methyl Ethyl Ketone: 8.0%

Acetic acid ethyl ester: 10.0%

<Conductive Metal Slurry Composition>

The organic binder 50.0%

Silver Powder 50.0%

b. Preparation of conductive metal slurry and its application

After weighing each of the components of the organic binder, they are stirred and dissolved with an emulsifying stirrer in a stainless steel container to prepare an organic binder. The slurry was put into a jar and milled at 35 rpm in a ball mill machine at 35 rpm for 10-15 hours to produce a slurry in which the silver powder was evenly distributed. Connected to the caster supplied A sheet for electromagnetic shielding was prepared by a doctor blade method on a carrier film with an appropriate conductive metal sheet thickness.

Tensile strength of the electromagnetic shielding sheet made of the organic binder and peeling characteristics, flexibility, and pinhole generation from the carrier film were examined, and the binder dispersibility ( Dispersion) was examined under the condition of surface roughness by metering using an optical microscope.

Example 2

a. Composition (% by weight)

<Organic Binder Composition>

Polyvinyl chloride: 9.0%

Nitrocellulose: 7.0%

Dioctyl phthalate: 4.0%

Dibutyl phthalate: 3.0%

Phosphate esther: 0.5%

Toluene: 58.5%

Methyl Ethyl Ketone: 8.0%

Acetic acid ethyl ester: 10.0%

<Conductive Metal Slurry Composition>

The organic binder 50.0%

Silver Powder 50.0%

b. Preparation of conductive metal slurry and its application

Same as Example 1, but prepared according to the composition ratio, the conductive metal sheet manufacturing method is also the same, the inspection method is also the same.

Example 3

a. Composition (% by weight)

<Organic Binder Composition>

Polyvinyl chloride: 10.0%

Nitrocellulose: 8.0%

Dioctyl phthalate: 5.0%

Dibutyl phthalate: 3.0%

Phosphate esther: 0.5%

Toluene: 55.5%

Methyl Ethyl Ketone: 8.0%

Acetic acid ethyl ester: 10.0%

<Conductive Metal Slurry Composition>

The organic binder 50.0%

Silver Powder 50.0%

b. Preparation of conductive metal slurry and its application

Same as Example 1, but prepared according to the composition ratio, the conductive metal sheet manufacturing method is also the same, the inspection method is also the same.

Example 4

a. Composition (% by weight)

<Organic Binder Composition>

Polyvinyl chloride: 11.0%

Nitrocellulose: 8.0%

Dioctyl phthalate: 5.0%

Dibutyl phthalate: 3.0%

Phosphate esther: 1.0%

Toluene: 52.0%

Methyl Ethyl Ketone: 8.0%

Acetic acid ethyl ester: 12.0%

<Conductive Metal Slurry Composition>

The organic binder 50.0%

Silver Powder 50.0%

b. Preparation of conductive metal slurry and its application

Same as Example 1, but prepared according to the composition ratio, the conductive metal sheet manufacturing method is also the same, the inspection method is also the same.

Comparative Example 1

a. Composition (% by weight)

<Organic Binder Composition>

Polyvinyl chloride: 7.0%

Nitrocellulose: 4.0%

Dioctyl phthalate: 4.0%

Dibutyl phthalate: 2.0%

Phosphate esther: 0.5%

Toluene: 64.5%

Methyl Ethyl Ketone: 8.0%

Acetic acid ethyl ester: 10.0%

<Conductive Metal Slurry Composition>

The organic binder 50.0%

Silver Powder 50.0%

b. Preparation of conductive metal slurry and its application

Same as Example 1, but prepared according to the composition ratio, the conductive metal sheet manufacturing method is also the same, the inspection method is also the same.

Comparative Example 2

a. Composition (% by weight)

<Organic Binder Composition>

Polyvinyl chloride: 14.0%

Nitrocellulose: 11.0%

Dioctyl phthalate: 4.0%

Dibutyl phthalate: 2.0%

Phosphate esther: 0.5%

Toluene: 50.5%

Methyl Ethyl Ketone: 8.0%

Acetic acid ethyl ester: 10.0%

<Conductive Metal Slurry Composition>

The organic binder 50.0%

Silver Powder 50.0%

b. Preparation of conductive metal slurry and its application

Same as Example 1, but prepared according to the composition ratio, the conductive metal sheet manufacturing method is also the same, the inspection method is also the same.

Next, Table 2 summarized the test results in Example 1-4 and Comparative Example 1-2.

Experiment Dispersibility Sheet appearance characteristics The tensile strength Electrical resistance Pinhole frequency Judgment Example 1 2 3 4 0000 0000 0000 0000 0/1000/1000/1000/100 0000 Comparative Example 1 2 xx xx xx xx 51/10036/100 xx

                                  (0: good, x: bad)

Compared with the comparative example, the electromagnetic wave shielding conductive sheet according to the organic binder composition of Example 1-4 according to the present invention had relatively good dispersibility, tensile strength, peeling property, flexibility, and electrical conductivity, and the fluorescent lamp as a back light. As a result of observing the occurrence of pinhole on the conductive metal sheet, it was also found to be very excellent.

On the other hand, when UV curable resin (Resin) is used as an organic binder, the curing speed is high and productivity is high. In addition, the produced conductive sheet has almost no shrinkage and defects do not occur. Although the composition of this excellent electroconductive sheet can be obtained, the manufacturing method is as follows.

The composition of the conductive paste of the present invention (conductive paste) is composed of a ratio of 15.0-84.0% by weight of the conductive polymer, 1.0-15.0% by weight of the conductive metal powder and 15.0-70.0% by weight of the UV curable resin.

As the conductive metal powder, any one or a mixture of silver powder, copper powder, silver coated copper powder, and a small amount of nickel powder may be used. Flake type metal powder is used in order to have excellent characteristics. The metal powder is manufactured by a common coprecipitation method which is well known in the art, and the silver powder has a tap density of 2.0. -4.5g / cc, specific surface area is 1.5-4.0m ² / g, Tap Density of Cu powder is 1.5-3.0g / cc, specific surface area is 0.7-2.0m ² / g, silver is Silver coated copper powder has a tap density of 2.0-3.5 g / cc, specific surface area of 8.0-13.0 m ² / g, and nickel powder has a tap density of 2.0. -3.0 g / cc and specific surface area of 9.0-15.0 m ² / g are used.

As the conductive polymer powder, polyaniline emeraldine salt powder is mainly used. The manufacturing process is as follows.

First, 30 L (liter) of 1 M (mol) hydrochloric acid (HCl) solution was added to a 60 L (liter) reactor, 200 ml of aniline monomer was added thereto to a 0.22 molar concentration, and dissolved in a stirrer installed in the reactor. Cooling system) was operated to maintain cooling to 0 ℃.

Separately, 20 L (liter) of 1 mole HCl solution was added to the reactor auxiliary tank, and dissolved by adding 11.5 g of ammonium peroxydisulfate ([(NH ₄ ) ₂ S ₂ O ₈ ]), an oxidizing agent, to a 0.05 molar concentration. After cooling, the mixture was kept at 0 ° C.

The solution containing the aniline monomer maintained at 0 ° C. was stirred with a stirrer and added over 10-20 minutes using a metering pump to introduce a solution containing an oxidant into the reactor.

At this time, the reaction starts to occur simultaneously with the contact of the two solutions, and as the reaction proceeds, the solution becomes dark navy blue and the surface of the solution has a coppery luster. The reaction in the reactor maintained at 0 ° C. was allowed to react for 90 minutes with continued stirring. The reactant reacted for 90 minutes is transferred to a funnel of a filtration apparatus filtered by a vacuum pump or a water aspirator using an acid resistant pump, and then dehydrated to obtain a synthesized conductive polymer precipitate. .

The obtained precipitate (Polyaniline Cake) was put again in 40 L of 1 mol HCl solution and reacted with a stirrer for 2-15 hours to obtain pulled doped polyaniline salt (Emeraldine Salt), which was then vacuum pump or water aspirate. The polyaniline cake obtained by filtration with a funnel of a filtration device filtered by a water aspirator was dried in a vacuum drying oven for 2-10 hours to completely remove moisture and then finely pulverized the polyaniline salt powder by a rod mill. Got it.

Polypyrrole powder may be used as the conductive polymer powder, and the manufacturing process of the polypyrrole powder is as follows.

1 mole of pyrrole, 0.5 mole of naphthalenesulfonic acid as a dopant, and 3 mole of iron softened iron as an oxidizing agent were reacted in an aqueous solution for 2 hours, filtered, dried under vacuum, and then pulverized.

Also, in the invention, the selection of the UV curable resin is very important. The UV curable resin determines the flowability of the conductive sheet and the curing properties and workability of the product after molding, and determines the dispersibility of the conductive polymer powder and the metal powder, as well as the uniformity, excellent elasticity, durability, tensile strength, and electrical properties of the molded product. This is because the properties and the adhesion to the adherend are influenced.

The composition ratio of the electrically conductive sheet using UV curable resin, and its manufacturing method are as follows.

UV Curing Type Polyester Resin: 15.0-50.0% by weight

Photo Initiator: 1.0-5.0 wt%

Polyaniline Emeraldine Salt Powder: 15.0-70.0 wt%

Conductive Metal Powder: 1.0-15.0% by weight

In order to prepare a paste using a conductive polymer, 15.0-70.0 wt% of polyaniline emeraldine salt powder prepared by the above method, 15.0-50.0 wt% of UV curing type polyester resin, and photoinitiator ( Initiator) 1.0-5.0 wt%, plate-shaped conductive metal powder (Ag, Cu, Ni, Cu coated Ag) 1.0-15.0 wt% prepared by coprecipitation and weighed in a stainless steel container to emulsify Completely disperse the metal and polymer powder while stirring with Emulsifier, and then pass it three times or more with a 3-roll mill to achieve powder by milling and mixing effect. A conductive paste for shielding electromagnetic waves having good dispersibility and suitable for printing and casting was prepared.

The conductive paste is molded into various forms by dispensing, extruding, tape casting, molding, screen printing, and cured by UV curing. EMC sheets and films can be obtained.

Table 3 shows the characteristics of the conductive paste for shielding the metal powder used in the present invention and the paste and slurry type prepared therefrom.

Electroconductive Paste Metal Powder for Shielding Conductive paste composition Furtherance Ag   Cu  Ag coated Cu Ni Solid State (%) 15.0-85.0 ± 1.0 Surface area (m ² / g) 1.5 to 4.0 0.7 to 2.0 8.0-13.0 9.0-15.0 Viscosity (RVT, # 3, RPM20, ps) 7000 ~ 30000 ± 3000 Tap Density (g / cc) 2 to 4.5 1.5 to 3.0 2.0 to 3.5 2.0 to 3.0 Specific gravity (g / cc) 1.5 to 5.0

Hereinafter, a comparative example is described together with specific examples of the present invention.

Example 5

a. Composition (% by weight)

<Composition of UV Curable Conductive Sheet>

UV Curing type Polyester resin: 32.0%

Initiator: 3.0%

Polyaniline Emeraldine Salt Powder: 55.0%

Conductive Metal Powder (Ag, Cu, Ni, Ag Coated Cu): 10.0%

b. Preparation and Application of UV Curable Conductive Sheet Composition

Weighing each component of the UV curable conductive sheet composition, 10.0% by weight of Ag, Cu, Ni, Ag coated Cu with a plate-shaped conductive metal powder, 55.0% by weight of polyaniline Emeraldine Salt powder and UV-curable polyester resin (UV) Curing type Polyester resin) 32.0% by weight and photoinitiator 3.0% by weight, weighed in a stainless steel container and dispersed completely with an emulsion stirrer for 0.5-3 hours, followed by a 3-roll mill (3-roll mill) through three or more times to produce a conductive sheet composition for electromagnetic shielding excellent in the dispersibility of the powder and suitable for printing and tape casting (Milling) and mixing (Mixing) effect.

EMI prepared by forming a conductive sheet composition in various forms by dispensing and extruding, tape casting, molding, screen printing, and cured by UV curing machine / EMC sheets and films can be obtained.

The electromagnetic wave shielding effect of the EMI / EMC sheet and film formed into various forms by the above method was measured, and the adhesion and flexibility with the adherend were examined, and the dispersion of the metal powder was measured. And the surface and the fracture surface of the film were examined in a microstructure state using an electron microscope.

Example 6

a. Composition (% by weight)

<UV curable conductive sheet composition composition>

UV Curing type Polyester resin: 27.0%

Initiator: 3.0%

Polyaniline Emeraldine Salt Powder: 60.0%

Conductive Metal Powder (Ag, Cu, Ni, Ag Coated Cu): 10.0%

b. Preparation and Application of UV Curable Conductive Sheet Composition

EMI / EMC molded in various forms by dispensing and extruding, tape casting, and molding the UV curable conductive sheet composition prepared according to the composition ratio as in Example 5. Film and sheet manufacturing method is also the same, inspection method is also the same.

Example 7

a. Composition (% by weight)

<UV curable conductive sheet composition composition>

UV Curing type Polyester resin: 20.0%

Initiator: 3.0%

Polyaniline Emeraldine Salt Powder: 65.0%

Conductive Metal Powder (Ag, Cu, Ni, Ag Coated Cu): 12.0%

b. Preparation and Application of UV Curable Conductive Sheet Composition

EMI / EMC molded in various forms by dispensing and extruding, tape casting, and molding the UV curable conductive sheet composition prepared according to the composition ratio as in Example 5. Film and sheet manufacturing method is also the same, inspection method is also the same.

Example 8

a. Composition (% by weight)

<UV curable conductive sheet composition composition>

UV Curing Type Polyester Resin: 16.0%

Initiator: 2.0%

Polyaniline Emeraldine Salt Powder: 70.0%

Conductive Metal Powder (Ag, Cu, Ni, Ag Coated Cu): 12.0%

b. Preparation and Application of UV Curable Conductive Sheet Composition

EMI / EMC molded in various forms by dispensing and extruding, tape casting, and molding the UV curable conductive sheet composition prepared according to the composition ratio as in Example 5. Film and sheet manufacturing method is also the same, inspection method is also the same.

Example 9

a. Composition (% by weight)

<UV curable conductive sheet composition composition>

UV Curing type Polyester resin: 27.0%

Initiator: 3.0%

Polypyrrole Powder: 60.0%

Conductive Metal Powder (Ag, Cu, Ni, Ag Coated Cu): 10.0%

b. Preparation and Application of UV Curable Conductive Sheet Composition

EMI / EMC molded in various forms by dispensing and extruding, tape casting, and molding the UV curable conductive sheet composition prepared according to the composition ratio as in Example 5. Film and sheet manufacturing method is also the same, inspection method is also the same.

Comparative Example 3

a. Composition (% by weight)

<UV curable conductive sheet composition composition>

UV Curing type Polyester resin: 73.0%

Initiator: 3.0%

Polyaniline Emeraldine Salt Powder: 14.0%

Conductive Metal Powder: 10.0%

b. Preparation and Application of UV Curable Conductive Sheet Composition

EMI / EMC molded in various forms by dispensing and extruding, tape casting, and molding the UV curable conductive sheet composition prepared according to the composition ratio as in Example 5. Film and sheet manufacturing method is also the same, inspection method is also the same.

Comparative Example 4

a. Composition (% by weight)

<UV curable conductive sheet composition composition>

UV Curing Type Polyester Resin: 13.0%

Initiator: 2.0%

Polyaniline Emeraldine Salt Powder: 70.0%

Conductive Metal Powder: 15.0%

b. Preparation and Application of UV Curable Conductive Sheet Composition

EMI / EMC molded in various forms by dispensing and extruding, tape casting, and molding the UV curable conductive sheet composition prepared according to the composition ratio as in Example 5. Film and sheet manufacturing method is also the same, inspection method is also the same.

Experiment Dispersibility Electromagnetic shielding characteristics flexibility The tensile strength Plastic and Adhesive Judgment Example 5 6 7 8 9 00000 00000 00000 00000 00000 00000 Comparative Example 3 4 xx x0 0x xx xx xx

                                 (0: good, x: bad)

Compared with the comparative example, the conductive sheet composition for electromagnetic shielding of Example 5-9 according to the present invention was excellent in dispersibility and workability, and excellent in electromagnetic shielding properties and flexibility, chemical reactivity, adhesion to the adherend, and tensile strength. And it was found.

In the composition of the electromagnetic wave shielding conductive sheet according to the present invention and a method of manufacturing the same, an organic binder having low manufacturing cost and good fluidity and dispersibility is provided, thereby providing a composition of a conductive sheet excellent in electrical conductivity and a method of manufacturing the same.

Particularly, in the present invention, an organic binder having low manufacturing cost, good fluidity and dispersibility, and a conductive metal sheet having excellent flexibility, tensile strength, peeling property, and electrical conductivity properties can be obtained. Particularly, the organic binder is UV as an organic binder. By using curable resin (Resin), the curing speed is high and productivity is high. In case of manufactured conductive sheet, there is almost no shrinkage, and defects do not occur. Thus, a product that satisfies high reliability electromagnetic shielding characteristics is manufactured. It is possible to prevent noise in notebooks, computer cases (CASE), PCS terminal cases, LCD monitor cases, VCR cases, CRT monitor cases, and home appliances, measuring devices, and communication devices that generate radioactive harmful electromagnetic noise. It is possible to apply.

Claims (7)

In the electromagnetic wave shielding conductive sheet composition consisting of a UV curable resin, a conductive metal powder and a conductive polymer powder, UV curable type polyester resin 15.0-50.0% by weight, photoinitiator 1.0-5.0% by weight, Polypyrrole or polyaniline salt (Polyaniline Emeraldine Salt) powder 15.0-70.0% by weight, conductive metal powder (Conductive Metal Powder) conductive sheet composition for shielding electromagnetic waves, characterized in that consisting of 1.0 to 15.0% by weight. The conductive metal powder of claim 1, wherein the conductive metal powder is selected from the group consisting of silver (Ag), copper (Cu), silver-coated copper, nickel (Ni), aluminum (Al), tin (Sn), and zinc (Zn). Any one material or a mixture of two or more thereof may be used, and the silver (Ag) powder has a tap density of ² to 4.5 g / cc, a specific surface area of 1.5 to 4.0 m ² / g, and a copper (Cu) powder. Tap density is 1.5 to 3.0 g / cc, specific surface area is 0.7 to ^2.0 m ² / g, and silver coated copper powder has a tap density of 2.0 to 3.5 g / cc. cc, specific surface area is 8.0 to 13.0m ² / g, nickel (Ni) powder has a tap density of 2.0 to 3.0g / cc, specific surface area is 9.0 to 15.0m ² / g, characterized in that Electroconductive sheet composition for electromagnetic wave shielding. The conductive sheet composition of claim 1 or 2, wherein the conductive polymer is made of any one of polyaniline and polypyrrole, or a mixture thereof. The conductive sheet composition according to claim 1 or 2, wherein the conductive sheet composition has a solidity of 15.0 to 85.0 ± 1.0%, a viscosity of 7000 to 30000 ± 3000 cps, and a specific gravity of 1.5 to 5.0 g / cc or more. In the method for producing a conductive sheet composition for shielding electromagnetic waves, wherein the metal powder is uniformly mixed with an organic binder which is a polymer material, each of the organic binder compositions according to claim 1 is weighed and placed in a stainless steel container to provide an emulsifier. ) And completely disperse the metal and polymer powder with stirring for 0.5-3 hours, and then pass it three times or more with a 3-roll mill to obtain powder (Milling) and Mixing (Mixing) effect. Method for producing a conductive sheet composition for shielding electromagnetic waves, characterized in that the dispersibility of the powder) is good and to prepare a paste suitable for printing and casting (Casting). The method according to claim 5, wherein the conductive sheet composition is molded into various forms by dispensing and extrusion, tape casting, molding, screen printing, and then UV The manufacturing method of the electroconductive sheet composition for electromagnetic wave shields which manufactures an electroconductive sheet with a hardening machine. The electric / electronic product case, a mobile communication product case, a home appliance, a measuring apparatus, and a communication device which generate | occur | produce radioactive harmful electromagnetic noises of Claim 1 are comprised of a notebook, a computer case, an LCD monitor case, a VCR case, and a CRT monitor case. Electromagnetic shielding conductive sheet composition, characterized in that it is applied for noise.