KR102076829B1 - Manufacturing method of eco-friendly Electromagnetic Intereference Shielding Materials - Google Patents

Abstract

The present invention relates to an electromagnetic shielding composition in a state in which water is supported on agar and/or konjac based on agar and/or konjac and an electromagnetic shielding material using the same. More particularly, the present invention has an advantage wherein is simple to manufacture, cost-saving, and harmless to the human body by using agar and/or konjac composed mostly of water as an electromagnetic wave shielding material. In addition, the electromagnetic shielding composition may further improve an electromagnetic shielding performance by containing a metal ion salt.

Description

Manufacturing method of eco-friendly Electromagnetic Intereference Shielding Materials

The present invention relates to an environment-friendly electromagnetic wave shielding material, and more particularly, to provide an electromagnetic wave shielding composition using water, agar and / or konjac, and further improving the electromagnetic shielding performance by adding a metal ion salt thereto as necessary. have.

Recently, with the development of electronic and communication devices, the convenience of human life is greatly improved, and at the same time, the problem of harmfulness caused by the exposure of electromagnetic waves generated from electronic devices is increasing. In particular, as the light weight, miniaturization and design of electronic devices are diversified, housing materials are replaced by metals and plastics, so that electromagnetic waves generated from the inside of the electromagnetic are easily leaked to the outside of the electromagnetic. These leaked electromagnetic waves can interfere with other surrounding electromagnetic waves, causing the electromagnetic waves to malfunction or even adversely affect the human body. Long-term exposure to strong electromagnetic waves, hormonal disturbances of the secretion system or weak immune system, especially pregnant women, elderly people are vulnerable to electromagnetic waves, so the situation that needs a solution to these damages.

At present, electromagnetic shielding technologies for protecting human body and various devices are spurring the development of electromagnetic shielding technology in various fields including chemical engineering beyond electronic information field.

Electromagnetic shielding refers to shielding of electromagnetic interference incident from the outside. Electromagnetic waves are reflected or absorbed and extinguished when they meet a material in progress. The degree is related to the conductivity of the material. The Shielding Effectiveness (SE) is a combination of the reflective and absorbing capabilities of shielding materials. And absorption capacity is increased.

It is therefore advantageous for the electromagnetic shielding material to be electrically conductive and to have a large surface area. Conventionally, metals such as copper, iron, nickel, aluminum, tin, and zinc, which have good electromagnetic properties, have been spotlighted as shielding materials, but metals are generally heavy, have poor workability, and cause corrosion, making them safer and more environmentally friendly. There is a need for new shielding materials that are economically competitive.

According to the above situation, the present inventors first paid attention to the principle of microwave oven as a shielding material. Microwave, which is an area of electromagnetic waves used in microwave ovens, passes through the wave without being affected by materials such as glass, paper, and plastic, Food is heated and cooked on the principle of being absorbed by constituent water molecules or other molecules such as fat and sugar. In addition, radio wave interference occurs due to electromagnetic interference in the sea, and thus the idea that water will be effective as an electromagnetic shielding material.

In the present invention, by using water as a solid to prepare an eco-friendly agar or konjac mostly composed of water to directly check the electromagnetic shielding effect. When agar or konjac is used as an electromagnetic shielding material, it is possible to secure the disadvantages of the conventional electromagnetic shielding material because it is inexpensive, easy to process, and environmentally friendly.

In addition, since seawater absorbs electromagnetic waves better than pure water, a method of adding a composite material using a metal ion salt was investigated to improve electromagnetic shielding performance. This leads to the present invention for producing an electromagnetic shielding material using a metal ion salt which is easily available in daily life and can be simply added.

For example, in US Patent Publication No. 2006-0099403, a composite was made of an electromagnetic shielding material consisting of a heat conductor and a magnetic material, and used as a heat conducting material between a semiconductor chip and a heat dissipation heat sink. The thermal conductor and the electromagnetic shielding material are dispersed in the matrix as small particles to shield the thermally conductive electromagnetic waves.

US Patent Publication No. 2016-0233173 discloses an electromagnetic wave shielding material dispersed in a polymer matrix including alumina particles having thermal conductivity, carbonyl iron powder and silicon carbide as an electromagnetic wave shielding material to improve the thermal conductivity while maintaining the electromagnetic shielding rate Improved electromagnetic shielding efficiency.

However, as interest in environmental problems has increased around the world, attention has been paid to environmentally friendly materials with electromagnetic shielding performance. In the present invention, the electromagnetic shielding material can be easily manufactured by applying environmentally friendly shielding materials. It was confirmed that it could be used and the present invention was reached.

United States Patent Application Publication No. 2006-0099403 United States Patent Application Publication No. 2016-0233173

SUMMARY OF THE INVENTION An object of the present invention is to provide a shielding composition having an electromagnetic shielding performance, which optionally includes a metal ion salt based on environmentally friendly agar and / or konjac.

As a means for solving the above problems, the present invention provides an electromagnetic wave shielding composition, the electromagnetic shielding composition comprises at least one of agar or konjac and water, the water is supported by agar and / or konjac. do.

In one embodiment of the present invention, the electromagnetic shielding composition is characterized in that it further comprises a metal ion salt.

In a preferred embodiment of the present invention, the metal ion salt may be at least one selected from metal chelate, metal nitrite, metal chloride.

In a preferred embodiment of the present invention, the metal ion salt is sodium acetate, potassium acetate, iron (II) acetylacetonate, iron (III) acetylacetonate, cobalt (II) acetylacetonate, nickel (II) acetylacetonate, copper (II) acetylacetonate, manganese (II) acetylacetonate, magnesium (II) acetylacetonate, bis cyclopentadienyl iron (II), bis cyclopentadienyl cobalt (II), bis cyclopentadienyl nickel (II), bis cyclopentadienyl magnesium (II), bis cyclopentadienyl manganese (II), sodium nitrate, potassium nitrate, iron (II) nitrate, iron (III) nitrate, cobalt (II) nitrate, nickel (II) nitrate, copper (II) nitrate, manganese (II) nitrate, magnesium (II) nitrate, sodium chloride, potassium chloride at least one selected from the group consisting of iron (II) chloride, iron (III) chloride, cobalt (II) chloride, nickel (II) chloride, copper (II) chloride, manganese (II) chloride, magnesium (II) chloride Can be.

In a preferred embodiment of the present invention, the electromagnetic wave shielding composition may further include a curing aid, the curing aid is resorcinol resins (phenolic resins), phenolic resins, phenolic polymers (phenolic acid polymer), monosaccharides, disaccharides, polysaccharides may be one or more selected from.

In a preferred embodiment of the invention, the monosaccharide is glucose (glucose), fructose (fructose), galactose (galactose), the disaccharide is sucrose (Sucrose), lactose (Lactose), maltose (Maltose), trehalose ( Trehalose, Melibiose, Cellobiose, and polysaccharides include Raffinose, Melezitose, Maltoriose, Starchose, Schrodese, and Starch. Starch, Resistant starch, Glycogen, Dextrin, Oligosaccharides, Cellulose, Fructan, Galactan, Galantan Mannan), alginic acid (Alginic acid), carrageenan (Carragennana), chitin (Chitin), lignin (Lignin), hemicellulose (Pemitin) may be one or more selected from (Pectin).

In a preferred embodiment of the present invention, the composition of the electromagnetic shielding material is a 1 to 20 parts by weight of agar and / or konjac, 100 parts by weight of water, 0 to 30 parts by weight of the metal ion salt, 0 to 20 parts by weight of the curing aid It may be contained as.

In addition, the present invention provides an electromagnetic shielding material formed of the electromagnetic shielding composition.

The electromagnetic wave shielding composition and the electromagnetic wave shielding material manufactured using the same according to the present invention have the advantage that water contained in the network inside the composition generates an electromagnetic shielding effect and is environmentally friendly while being environmentally friendly using agar and / or konjac.

In addition, the addition of a hydrophilic filler and a metal ion salt can improve the electromagnetic shielding performance, and has the advantage of excellent manufacturing convenience because the manufacturing process is simpler than the conventional electromagnetic shielding material.

1 is a structure of the agar shielding electromagnetic wave used in the embodiment of the present invention.
2 is a flowchart showing an exemplary process of synthesizing agar for shielding electromagnetic waves in the manufacture of the electromagnetic shielding material.
3 is a transmission electron micrograph observing the structure of the agar shielding electromagnetic wave according to Example 1 of the present invention.
Figure 4 is a graph of the electromagnetic wave shielding results of the agar shielding electromagnetic wave according to a third embodiment of the present invention.

Hereinafter, preferred embodiments of environmentally friendly electromagnetic shielding materials using agar and / or konjac according to the present invention will be described in detail. The terms or words used below should not be construed as being limited to the ordinary or dictionary meanings, and include anything in the technical scope that is substantially the same as the technical idea and achieves the same effect.

In addition, in the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The composition of the electromagnetic shielding material according to the present invention comprises at least one of agar or konjac and water, characterized in that the water is supported by agar and / or konjac.

In the electromagnetic shielding composition, the agar and / or konjac may be used in an amount of 1 to 20 parts by weight based on 100 parts by weight of water.

The agar and / or konjac referred to in the present invention has a physical property having a three-dimensional network structure capable of swelling by containing a large amount of water in an aqueous solution as a hydrophilic substance, and absorbs a large amount of water by using such a characteristic. The agar or konjac in the swollen state has excellent electromagnetic shielding performance.

The electromagnetic wave for the purpose of blocking herein is an electromagnetic wave generated in an electronic / communication device that is used in daily use, an electromagnetic wave in a region of 10 ¹⁴ Hz or less, preferably an electromagnetic wave in a region of 10 ¹¹ Hz or less, and more preferably 20 GHz or less. It is aimed at shielding electromagnetic waves.

The electromagnetic shielding material may further include a metal ion salt, and any metal ion salt may be used as long as the material has an electromagnetic shielding effect, and the metal ion salt added to enhance the electromagnetic shielding effect is 0 to 100 parts by weight of water. It may be added to 30 parts by weight.

Non-limiting examples of the metal ion salts include metal chelates, metal nitrites, metal chlorides, and one or more of these may be used.

Examples of the metal chelate include sodium acetate, potassium acetate, iron (II) acetylacetonate, iron (III) acetylacetonate, Cobalt (II) acetylacetonate, nickel (II) acetylacetonate, copper (II) acetylacetonate, manganese (II) acetyl Acetonate (manganese (II) acetylacetonate), magnesium (II) acetylacetonate, bis cyclopentadienyl iron (II), bis cyclopentadienyl cobalt ( Bis cyclopentadienyl cobalt (II), bis cyclopentadienyl nickel (II), bis cyclopentadienyl magnesium (II), bis cyclopenta Dienyl manganese (II) ((b is cyclopentadienyl manganese (II)), and the metal nitrite is sodium nitrate, potassium nitrate, iron (II) nitrate, iron (III) nitrate iron (III) nitrate, cobalt (II) nitrate, nickel (II) nitrate, copper (II) nitrate, Manganese (II) nitrate, magnesium (II) nitrate, etc., and metal chlorides are sodium chloride, potassium chloride, iron (II) chloride, iron (III) chloride, cobalt (II) chloride, nickel (II) chloride Copper (II) chloride, manganese (II) chloride, magnesium (II) chloride And the like, fluoride (magnesium (Ⅱ) chloride), it may be used one or more of these. Preferably sodium chloride, sodium nitrate, potassium chloride, potassium acetate, potassium nitrate, iron (III) acetylacetonate, iron (III) nitrate, iron (III) chloride, iron (II) acetylacetonate, iron (II) nitrate, iron ( At least one of Ⅱ) chloride, nickel (II) acetylacetonate, nickel (II) nitrate and nickel (II) chloride is used.

In addition, the present invention can be prepared by further comprising a curing aid in the electromagnetic wave shielding composition, the curing aid is used to enhance the strength to maintain the agar and / or konjac three-dimensional network structure.

The curing aid is preferably used from 0 to 20 parts by weight based on 100 parts by weight of water in terms of improving the physical strength and mechanical strength of the electromagnetic shielding material.

Examples of the curing aid include high molecular materials such as resorcinol resins, phenolic resins, phenolic acid polymers, monosaccharides, disaccharides, polysaccharides, and the like. have.

The monosaccharides are glucose, fructose, galactose, and the like, and the disaccharides are sucrose, lactose, maltose, trehalose, and melibiose. , Cellobiose and the like, and polysaccharides include raffinose, melezitose, maltoriose, starchose, schrodese, starch, and resident starch. (resistant starch), glycogen, dextrin, oligosaccharides, cellulose, fructan, galactan, mannan, alginic acid ), Carrageenana (carragennana), chitin (chitin), lignin (Lignin), hemicellulose (hemicellulose), pectin (pectin) and the like, one or more of these may be used.

In addition, the electromagnetic wave shielding composition may include 1 to 20 parts by weight of agar and / or konjac, 0 to 30 parts by weight of a metal ion salt, and 0 to 20 parts by weight of a curing aid.

The electromagnetic wave shielding material according to the present invention can be prepared by dispersing agar and / or konjac in water and adding a metal ion salt and a curing aid.

In the manufacture of the electromagnetic shielding material in Figure 1, it shows a process of synthesizing agar.

The method for producing an electromagnetic wave shielding composition of the present invention comprises the steps of: (a) adding and dispersing agar and / or konjac in water; (b) stirring with heating after step (a); (c) cooling the agar and / or konjac after step (b) to room temperature.

The temperature in the step (b) can be carried out in the range of 35 ~ 95 ℃, preferably 50 ~ 90 ℃, more preferably 70 ~ 85 ℃ temperature, the mixing is only stirring within 1 hour Although sufficient, in some cases, more than 2 hours of stirring may be required.

The curing aid may be used in the manufacturing method, wherein the addition of the curing aid may be administered when the agar and / or the konjac of step (a) are added to the water, before the agar and / or the konjac is added to the water. It may be subjected to a process of adding agar and / or konjac after being dissolved or dispersed in water in advance.

In addition, a metal ion salt may be added to improve the electromagnetic shielding ability. In this case, the addition of the metal ion salt may proceed simultaneously with the case of adding agar and / or konjac to water, but after dissolving or dispersing the metal ion salt in water in advance, adding the agar and / or konjac to the solution or dispersion. It may be advantageous in terms of dispersion of the metal ion salt.

When the metal ion salt is added to the electromagnetic shielding material, the manufacturing steps are as follows.

(a) adding a metal ion salt to water to dissolve or disperse it; (b) adding agar and / or konjac to the solution or dispersion and heating with mixing; (c) cooling the mixed agar and / or konjac to room temperature.

The temperature in the step (b) may be carried out in the range of 35 ~ 95 ℃, preferably 50 ~ 90 ℃, more preferably in the temperature range of 70 ~ 85 ℃, mixing is stirred for about 1 to 2 hours It is enough, but in some cases, more than 2 hours of stirring may be required.

The curing aid may be added in the above step, wherein the additional step of the curing aid may be added in step (a) or (b).

Hereinafter, the embodiment will be described for a more detailed description of the present invention. However, the following examples are only preferred examples of the present invention and the present invention is not limited to the following examples.

Example  1 to 8: electromagnetic waves Shielding material  Produce

Example  1 to 2

100 g of water at 80 ° C. was added to the agar or konjac as shown in Table 1, followed by stirring and mixing at 250 rpm for 1 hour. After cooling to a temperature below room temperature to prepare an electromagnetic shielding material.

division

Water (g)
additive

Kinds
Weight (g)

Example 1
100
Agar
1.25

Example 2

100
Konjac
1.25

Example  3 to 8

100 g of water was added to the metal ion salt as a solvent to form an aqueous solution, and heated to 80 ° C., followed by adding 1.25 g of agar (AGAR) powder and 20 g of sucrose, one of the curing aids, and 250 rpm for 1 hour at 80 ° C. Stirred and mixed. After cooling to a temperature below room temperature to prepare an electromagnetic shielding material. In addition, the type and amount of the metal ion salt added are shown in Table 2 below.

division
Type of metal ion salt
Input amount (g)

Example 3
Sodium chloride
20

Example 4
Sodium acetate
20

Example 5
Sodium nitrate
20

Example 6
Potassium chloride
20

Example 7

Potassium acetate
20
Example 8

Potassium nitrate
20

Experimental Example  1: Measurement of electromagnetic shielding performance

The electromagnetic wave shielding efficiency of the electromagnetic wave shielding composition prepared according to Examples 1 to 2 was analyzed by using the GPC-7 accessory to the Vector Network Analyzer in the 2-18 GHz frequency band. When the EMI SE value representing the electromagnetic shielding performance is 25 dB or more in the frequency band, it can be regarded as excellent as a shielding material. The measurement results of the shielding performance of the electromagnetic shielding material manufactured according to Example 1 or 2 are shown in Table 3. Indicated.

Example 1

Example 2
EMI SE (dB)
25

25

From the results shown in Table 1, it can be seen that the electromagnetic shielding performance of the agar or konjac holding the added water inside is excellent, and it is confirmed that the agar or konjac added to the water improves the efficiency of the electromagnetic shielding material. .

In addition, the electromagnetic wave shielding composition prepared according to Examples 3 to 8 added with a metal ion salt and a natural polymer based on agar was measured under the same conditions as the experiments for measuring shielding performance of the electromagnetic shielding material according to Examples 1 to 2 above. Shielding performance was measured. Table 4 shows the measurement results according to the types of metal ion salts.

Example 3

Example 4
Example 5
Example 6
Example 7
Example 8
EMI SE (dB)
30
30
30
30
30
30

As shown in Table 4, it was confirmed that the performance of the electromagnetic wave shielding material added with the metal ion salt and the natural polymer was improved compared to the addition of only agar, and the effect of improving the efficiency of the electromagnetic wave shielding material added with the metal ion salt was preferable. . The effect difference according to the type of metal ion salt was hardly shown, and it can be seen that the type of metal ion salt has little effect on the shielding effect difference.

 Having described the specific part of the present invention in detail, it will be apparent to those skilled in the art that the specific description is only a preferred embodiment, and thus the scope of the present invention is not limited thereto. will be. Thus, the substantial scope of the present invention will be defined by the appended claims and their equivalents.

Claims (9)

(a) adding a metal ion salt to water to dissolve or disperse it;
(b) heating the solution or dispersion to a temperature of 80 to 85 ° C., then adding agar and / or konjac and a curing aid, stirring and mixing in the temperature range; And
(c) after the step (b), cooling to a temperature below room temperature to prepare an electromagnetic shielding material composition;
The curing aid is at least one selected from resorcinol resins, phenolic resins, phenolic acid polymers, monosaccharides, disaccharides, and polysaccharides. Manufacturing method. The method of claim 1,
The metal ion salt is at least one selected from a metal chelate, a metal nitrite and a metal chloride, characterized in that the manufacturing method of the electromagnetic wave shield material. The method of claim 1,
The metal ion salt is sodium acetate, potassium acetate, iron (II) acetylacetonate, iron (III) acetylacetonate, cobalt (II) acetylacetonate, cobalt (II) acetylacetonate, nickel (II) acetylacetonate, copper (II) acetylacetonate, manganese (II) acetylacetoate Manganese (II) acetylacetonate, magnesium (II) acetylacetonate, bis cyclopentadienyl iron (II), bis cyclopentadienyl cobalt (II) (bis cyclopentadienyl cobalt (II)), bis cyclopentadienyl nickel (II), bis cyclopentadienyl magnesium (II), bis cyclopentadiene Neil manganese (II) ((bis cyclop entadienyl manganese (II)), sodium nitrate, potassium nitrate, iron (II) nitrate, iron (III) nitrate Cobalt (II) nitrate, nickel (II) nitrate, copper (II) nitrate, manganese (II) nitrate manganese (II) nitrate, magnesium (II) nitrate, sodium chloride, potassium chloride, iron (II) chloride, iron (III) chloride, cobalt (II) chloride, nickel (II) chloride, copper (II) chloride, At least one member selected from the group consisting of manganese (II) chloride and magnesium (II) chloride The method of manufacturing the electromagnetic wave shielding material of green composition, characterized by. The method of claim 1,
The monosaccharides are glucose, fructose, and galactose, and the disaccharides are sucrose, lactose, maltose, trehalose, melibiose, melibiose, and the like. Cellobiose, polysaccharides include Raffinose, Melezitose, Maltoriose, Starchose, Schrodese, Starch, Resident Starch Resistant starch, Glycogen, Dextrin, Oligosaccharide, Cellulose, Fructan, Galactan, Mannan, Alginic acid , Carrageenana (Carragennana), chitin (Chitin), lignin (Lignin), hemicellulose (Hemicellulose) and pectin (Pectin), characterized in that at least one selected from, electromagnetic wave shielding material manufacturing method. The method of claim 1,
EMI SE of the prepared electromagnetic shielding composition is characterized in that 30dB, the method of manufacturing an environmentally friendly electromagnetic shielding composition. delete delete delete delete

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