KR101655099B1

KR101655099B1 - Conductivity is imparted foam

Info

Publication number: KR101655099B1
Application number: KR1020150121385A
Authority: KR
Inventors: 윤일구
Original assignee: (주)메인일렉콤
Priority date: 2015-08-28
Filing date: 2015-08-28
Publication date: 2016-09-08

Abstract

More specifically, the present invention relates to a foamed molded article to which conductivity is imparted. More specifically, the present invention relates to a foamed molded article which is formed by organically bonding four consecutive connecting annular energizers to an entire area including an inside and an outside of a foamed molded article to absorb shock and vibration, So that conductivity can be imparted to both the direction and the horizontal direction.
According to an aspect of the present invention, there is provided a method of manufacturing a foamed molded article, the method including: forming a four-row continuous connection annular conductive member with respect to a total area including a surface and an interior of a foamed molded article having pores therein, Shaped connection portion is configured to organically combine to provide both vertical and horizontal conductivity and elastic required characteristics simultaneously. The connection annular conductive portion is made of gold, silver, nickel, copper, carbon black , Aluminum, or the like, and a conductive metal powder having different shapes and sizes is prepared, and then the conductive metal powder is formed singly or in combination of two or more thereof to form a connection annular electrification part .

Description

[0001] Conductivity is imparted foam [0002]

More specifically, the present invention relates to a foamed molded article to which conductivity is imparted. More specifically, the present invention relates to a foamed molded article which is formed by organically bonding four consecutive connecting annular energizers to an entire area including an inside and an outside of a foamed molded article to absorb shock and vibration, So that conductivity can be imparted to both the direction and the horizontal direction.

BACKGROUND ART As is well known, foamed molded articles widely used in industry generally refer to foams having pores and elasticity, and polyurethane foam, expanded polystyrene, foam latex and the like are typical according to the constituents of the resin. In addition to a cushion member requiring elastic characteristics with a tendency of widening the range widely, it is used as a basic material of an electrical connecting member for electrically connecting and connecting a pattern mounted on an electronic circuit board and a case or a bracket of metal objects Or as a substrate of a shielding member for shielding various harmful electromagnetic waves generated on circuits of various electronic communication equipments.

As in the above example, the foamed molded article for electrically connecting the conductive object to the conductive pattern of the circuit board or for applying the electromagnetic shielding member is light and has excellent elastic properties, while a non-conductive material has various components for imparting conductivity to the outer surface of the foamed molded article And then use it.

In general, it is possible to attach a fabric or film made of a metal conductive material, a thin metal plate, a conductive tape or an electrically conductive nonwoven fabric to the outer peripheral surface of the foamed molded article to impart electrical conductivity. In addition to the surface conductivity in the horizontal direction, Thickness direction) is difficult to be imparted, and the process of adhesion is complicated, resulting in poor productivity and economical efficiency. In addition to the repetitive elastic action, the circuit element is easily affected by the moving heat and is easily peeled or deformed, Which is a problem.

Accordingly, in order to solve the structural problem that has arisen from the method of wrapping the conductive member on the surface of the foamed molded article, there has been proposed a method of coating or plating a conductive material on the foamed molded article itself. Typically, The upper and lower surfaces of the molded body are electrically energized to the inside, but the elasticity and the restoring force are reduced due to the conductive material coated on the holes, and foreign substances such as dust can be introduced into the holes. There is a disadvantage in that electric conduction is not performed in the cut surface where the conductive material is not coated, and the electric conduction in the vertical direction is cut off.

In addition, as disclosed in Korean Patent Registration No. 0619573, ultrasonic cleaning is performed on an expanded molded article in which fine holes are densely punctured at regular intervals, and nickel, copper, silver, tin, cobalt or the like is removed by electroless plating, electrolytic plating, Of the conductive metal is plated on the surface and the hole of the molded body so that shock absorption, electromagnetic wave shielding and elastic restoring force are maintained. However, in the process (bending and bending process) It is easy to come off in the form of powder and it can cause electric short-circuiting problem when it comes into contact with an electronic circuit. Since productivity and workability are not good due to processing of a molded product, a crack is generated in the plated conductive layer with time, Not only poor quality stability due to degradation but also lateral action It is that the cracking phenomenon occurs frequently against the external force.

Accordingly, the present invention has been developed in order to efficiently solve the problems of the prior art, and it is an object of the present invention to provide a method of manufacturing a foamed molded article by mixing a different kind of conductive metal powder having a different shape and size with a synthetic resin material, Shaped conductive portions formed between the pores so that conductivity is imparted to both the vertical and horizontal directions in addition to the elastic characteristics for absorbing shock and vibration.

According to an aspect of the present invention, there is provided a method of manufacturing a foamed molded article, the method including: forming a four-row continuous connection annular conductive member with respect to a total area including a surface and an interior of a foamed molded article having pores therein, Shaped conductive parts are combined with each other to provide electrical conductivity in a vertical / horizontal direction and elastic demand characteristics at the same time.

The connection annular conductive part of the present invention may be prepared by preparing a different type of conductive metal powder which is made of a conductive metal powder selected from gold, silver, nickel, copper, aluminum or a combination thereof, And one or more of them are combined to form a connection annular current-carrying portion.

In addition, the different types of conductive metal powders are formed in an irregular shape (twig or leaf), a thin flat piece shape, or a spherical shape so that they can cohere and closely contact each other with continuity of each other. As a characteristic of technical construction.

According to the present invention, since the continuous connection type annularly-shaped current-carrying parts are formed in a single unit shape in the expansion-molded article, the surface conductivity and the volume conductivity (conductivity in the vertical thickness direction) are obtained simultaneously while maintaining the shock- And can be widely applied to an electrical connecting member or an electromagnetic wave shielding member for electrically connecting a conductive object to a conductive pattern on a circuit board outside a use for use as a cushion member in various industrial fields requiring elastic characteristics .

In addition, since the connection annular current-carrying portion for the conductive connection is formed at the same time as the production of the foamed molded article, there is no need to attach a separate attachment to be treated as in the past or to perform post-processing such as hole boring and conductive material coating and plating, In addition, there are many advantages in cost competitiveness, and it is possible to further improve the quality stability and conduction efficiency by preventing deterioration of physical properties during handling and use.

In addition, since the conductive metal powder is combined with a heterogeneous form having a shape and size so as to be closely contacted with each other with continuity, the conductive metal powder is repeatedly subjected to elastic action of the foamed molded article or the structural stability of the connected- The efficiency can be maintained satisfactorily.

1 is a cross-sectional view of a foamed molded article according to a preferred embodiment of the present invention;
Fig. 2 is an enlarged view showing a connection annular current passing portion according to the present invention
FIG. 3 is an enlarged view of the conductive metal powder according to the present invention. FIG. 3 (a) is a leaf-shaped conductive metal powder, (b) is a thin metal piece-like conductive metal powder, Respectively.
4 is an enlarged cross-sectional view of a foamed molded article according to another embodiment of the present invention
5 is an enlarged view of a carbon nanotube according to the present invention

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor can define the concept of the term appropriately in order to describe his or her invention in the best way It should be understood that the present invention is not limited to the above embodiments and various changes and modifications may be made without departing from the spirit and scope of the present invention as defined by the appended claims and their equivalents. And it should be understood that various equivalents and modifications may be present.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an exemplary sectional view of a foamed molded article according to a preferred embodiment of the present invention, FIG. 2 is an enlarged view of a connecting annular current passing portion of the present invention, and FIGS. 3 (a) Respectively, of the conductive metal powder.

The foamed molded article 10 of the illustrated embodiment is obtained by extruding a polyolefin or polyurethane based synthetic resin, a conductive metal powder, a polyhydroxy compound, an organic polyisocyanate compound, a crosslinking agent, a catalyst, a foam stabilizer, The foam is molded at a constant thickness by using a comma coater apparatus on a conveyor belt which is a heat treatment apparatus after mixing with a gas at a high speed. In this case, the entire surface including the pores 11 and the inside Shaped connecting portion 20 composed of a conductive metal powder with respect to the area is formed to impart electrical conductivity in the vertical and horizontal directions as well as the elastic required characteristics.

The connection annular current passing portion 20 of the above example has a shape and a path and has a shape extending like a vine in a continuous manner in four directions and is formed in a space excluding the pores 11 having an elastic function As shown in Fig.

In the illustrated embodiment, the conductive metal powder is for constituting substantially the connecting annular conductive part 20 and may be used singly or in a mixture of one or more selected from the group consisting of gold / silver / nickel / copper / aluminum The conductive metal powders 20a, 20b and 20c can be applied in combination of one or more kinds of different types of conductive metal powders having different shapes and sizes. The conductive metal powders 20a to 20c typically have an irregular shape with a particle size of 30 to 150 mu m A thin twig or leaf form 20a, a thin piece shape 20b having a particle size of 10 to 60 占 퐉 or a spherical shape 20c having a particle size of 1 to 10 占 퐉.

The reason why the shape and size of the conductive metal powder constituting the connection annular conductive member 20 are different is that the conductive metal powders 20a, 20b and 20c in the expanded molded article 10 (polymer elastic body) The conductive metal powder 20 is provided for the purpose of providing electrical conductivity and structural stability of the connection annular conductive member 20. The shape and size of the conductive metal powder are not limited to the above example, And can have various sizes and shapes under conditions that can achieve good contact.

According to another exemplary embodiment of the present invention, the connection annular conductive member 20 may include at least one conductive metal powder 20a, 20b, 20c having different shapes and sizes, As shown in FIG.

The carbon nanotube (CNT) 20d in the above example is one of carbon isotopes having a hexagonal arrangement of carbon atoms in the shape of a tube. The carbon nanotube has a tensile strength of 100 times that of steel (Ability to withstand stretching forces) and excellent flexibility (ability to twist and bend freely and resilient to easily return to original shape after deformation) and metallic and electrical properties (electrical conductivity such as copper) 50 to 100 nm and is used as an intermediary agent for enhancing elastic strength and flexibility by being organically bound to the outer circumferential surface of the different kind of conductive metal powder and the internal gaps and preventing the contact between the conductive metal powders from being broken during the compression and elastic restoring process or bending process .

The following description will be made in detail on a process of forming a four-wire continuous connection type conductive part using different kinds of conductive metal powders having different shapes and sizes according to an embodiment of the present invention.

Preferentially, the conductive metal powders 20a and 20b of different kinds having different shapes and sizes are mixed with polyurethane synthetic resin, polyhydroxy compound, organic polyisocyanate compound and other additives (crosslinking agent, catalyst, foam stabilizer, pigment) The conductive metal powders are mixed with an inert gas such as nitrogen at a high speed and foamed. The conductive metal powders 20a and 20b having an irregular shape of 30 to 150 mu m in particle size as shown in Figs. 3 (a) and 3 (20b) having a particle size of 10 ~ 60 ㎛, and the specific gravity is not high. Therefore, the powder particles are scattered in four directions in the high-speed mixing and foaming process, and the adjacent powder particles adhere to each other (contact agglomerate) At this time, the conductive metal powders in the unformed state are not completely cured. (In a state of continuous contact and agglomeration in four directions), and the particles are closely contacted with each other without being flowed or settled so as to allow electrons to pass therethrough. The conductive particles 20a and 20b can form a four-line continuous loop-shaped conductive part 20, and it is preferable that the conductive loop- The shape of the leaf-shaped conductive particles 20a of a large size (30 to 150 占 퐉), the conductive particles 20b of the thin flake shape of medium size (10 to 60 占 퐉) and the spherical conductive particles 20b of the smallest size (1 to 10 占 퐉) (20c) are combined together so that the bonding force between the conductive particles is enhanced.

For example, conductive particles 20a in the form of branches or leaves are maintained in contact with each other in the longitudinal direction, the width direction, or the thickness direction in a state where the conductive particles 20a are dispersedly arranged in the resin compound between the foamed molded product pores 11, the surface of the leaf conductive particles 20a is formed like a sharp tooth like a tooth as in the actual enlargement example of a), so that the support binding force with the resin compound is firmly maintained.

In addition, as shown in FIG. 2, the conductive particles 20b in the form of thin pieces are buried in the gap formed between the conductive particles of the leaf form, and the conductive particles 20b are also contacted with each other. The surface is formed in an angular shape so as to maintain the supporting force with the resin compound in the dispersed position and to double the supporting force between the leaf type conductive particles.

In addition, since the spherical conductive particles 20c having the smallest size are finally filled and contacted as a gap between the leaf-shaped conductive particles 20a and the conductive particles 20b in the shape of the flat conductive particles 20b, The conductive path of the conductive foamed body 20 is formed more firmly and tightly without being disconnected due to the organic bonding of these conductive metal powders having different shapes and sizes to provide excellent conductivity. The quality of the connection annular current-carrying portion 20 is not deteriorated and the quality stability is improved.

In the meantime, the connection annular conductive member 20 of the present invention can be manufactured in the same manner as the carbon nanotubes 20d in the state that at least one kind of the conductive metal powder 20a, 20b, 20c having different shapes and sizes is selected, And the conductive particles 20a in the form of leaves or branches and the conductive particles 20b in the form of thin flakes can be combined with the carbon nanotubes 20d or the conductive particles 20b in the form of a thin piece- The particles 20b and the spherical conductive particles 20c may be combined with the carbon nanotubes 20d or may be combined with the spherical conductive particles 20a, 20b, 20c, (Conductive metal powder) and carbon nanotubes may be preferably combined. The conductive particles 20a and 20b may be combined together.

As shown in FIGS. 4 to 5, the largest sized branch-type conductive particles 20a are maintained in contact in various directions (length, width, thickness direction) at the dispersion position in the foamed resin compound, Sized fine flat conductive particles 20b are filled and contacted with the interstices formed between the conductive particles 20a and 20b in the shape of a leaf, 20c are filled and contacted with each other while the smallest sized fine carbon nanotubes 20d are in intimate contact with the outer peripheral surface of the conductive particles 20a, 20b, 20c and the inner fine space, It is necessary to double the binding force and to shorten the external force such as compression and elastic restoration process or bending (a phenomenon in which contact between conductive particles is broken) It is interrupted by.

More specifically, the metal conductive particles 20a, 20b, and 20c, which are not given flexibility and elasticity, have conditions optimized for maintaining close contact with each other under the condition that they are not deformed. However, (Elastic action) or bending, it is not easy for the corresponding contact portion to flow elastically and elastically in the contact state, so that the possibility of an intermittent short-circuit phenomenon can not be excluded. And is complemented by the carbon nanotubes 20d combined together.

For example, carbon nanotubes 20d having hexagonal tube shapes arranged in a regular lattice like a fiber structure and having excellent properties such as flexibility, elasticity and electrical conductivity as well as tensile strength are disposed on conductive particles 20a and 20b 20c are elastically coupled to the outer circumferential surface and the gap of the contact portion so that elasticity and flexure are generated. However, when the contact portion maintains the contact state, Therefore, it is possible to effectively prevent the connection-loop-shaped conductive part 20 extending continuously in four directions from being short-circuited to various physical deformation, and to provide tight continuity at all times. Further, the overall quality stability of the expansion- It can be further improved.

According to the preferred embodiments described above, the four-row continuous-loop-shaped conductive parts 20, which give conductivity to the vertical and horizontal directions of the entire area including the inside and the outside of the expansion molded article 10, (20a, 20b, 20c) of carbon nanotubes and carbon nanotubes, it is possible to prevent the impact from the outside or the repetitive elastic action of the carbon nanotubes It is easy to maintain productivity and workability. Also, when the foamed molded article is cut and used depending on the shape and size of the object to be attached, the electrical conductivity of the exposed cut surface is maintained as it is, , Compressive deformation and structural strength of the expanded molded article and the elastic behavior of the pores O can also be widely used as not only to retain the expansion-molded article quality, stability, and shot requiring sexual characteristics and conductive characteristics cushion member to the electromagnetic-wave blocking member and the electrical connection member.

10: expanded molded article,
11: Porosity,
20: connecting annular current carrying part,
20a: a leaf-shaped conductive metal powder (conductive particle),
20b: conductive metal powder (conductive particle) in the form of a thin piece,
20c: spherical conductive metal powder (conductive particle),
20d: Carbon nanotubes

Claims

The conductive metal powder is blended at a high speed with polyurethane synthetic resin, polyhydroxy compound, organic polyisocyanate compound, crosslinking agent, catalyst, foam stabilizer, pigment and inert gas at high speed so that the pores 11 are contained and conductivity is imparted In the expansion-molded article 10,
The conductive metal powder of the foamed molded article 10 is formed in a combination of different shapes and sizes so as to form a twig or a leaf form 20a extending in an irregular state with a particle size of 30 to 150 탆, (20b) having a particle size of 1 to 10 mu m and a spherical shape (20c) having a particle size of 1 to 10 mu m. The powder particles are scattered in four directions in the foaming process and adjacent powder particles aggregate with each other, To form a four-row continuous loop-shaped conductive member (20) with respect to the entire area including the surface and the interior of the foamed molded article.

The method according to claim 1,
Characterized in that the conductive metal powder for constituting the connection annular conductive member (20) is composed of at least one member selected from the group consisting of gold, silver, nickel, copper and aluminum,

The method according to claim 1,
Characterized in that carbon nanotubes (20d) are further added to the conductive metal powders (20a) (20b) (20c) for constituting the connection annular conductive member (20).

The method according to claim 1,
The conductive metal powder 20a, 20b and 20c for constituting the connection annular current transmitting part 20 is filled with a conductive metal powder 20b having an intermediate size in a gap in the contact area of the conductive metal powder 20a having the largest size, , And the smallest size of the conductive metal powder (20c) is brought into contact with the remaining gap between the largest size and the intermediate size conductive metal powder, so as to be brought into contact with each other.

The method of claim 3,
The carbon nanotube 20d is used as a medium for enhancing the elasticity and flexibility by contacting the outer circumferential surfaces of the different kinds of the conductive metal powders 20a, 20b and 20c and the internal gaps, Wherein a contact between the conductive metal powder is not short-circuited, and the particle size is 50 to 100 nm.

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