KR102115751B1 - Foam material distributed evenly and manufacturing method thereof - Google Patents

Abstract

The present invention is a foam material in which carbon nanotubes are evenly distributed over all parts and a method of manufacturing the carbon nanotubes evenly distributed throughout the foam so that the electrical conductivity of the product is uniform and light weight is maintained to prevent static electricity, shield electromagnetic waves, and military radar It can be used for various purposes such as aerospace, building interior materials, transportation machinery, and military applications by making parts with functions such as absorbers, vibration and sound absorption.

Description

Foam material with evenly distributed carbon nanotubes and its manufacturing method {FOAM MATERIAL DISTRIBUTED EVENLY AND MANUFACTURING METHOD THEREOF}

The present invention relates to a foam in which carbon nanotubes (CNTs) are evenly dispersed.

Specifically, it relates to a foam material in which carbon nanotubes are evenly dispersed by mixing and foaming a base material such as urethane or epoxy and a curable material, and a method for manufacturing the same.

Carbon materials include fullerene, carbon nanotubes, graphene, and graphite depending on the shape of the material.

Among them, the carbon nanotube has a hexagonal honeycomb-shaped graphite surface in which one carbon atom is combined with three other carbon atoms, and is rounded to a nano-sized diameter.

In addition, the carbon nanotubes may be classified into single wall carbon nanotubes (SWCNTs), multi-wall carbon nanotubes (MWCNTs), and multi-walled carbon nanotubes according to the dried form.

These carbon nanotubes have a strength of 1,000 times that of steel, superior electrical conductivity than copper, and thermal conductivity equivalent to diamond, and have excellent physical properties and are used as additives for various materials, preventing static electricity, shielding electromagnetic waves, and absorbing radar waves It is used as a material for products that require functionality such as sound insulation, sound insulation, and heat dissipation, and is used in various fields such as the electric field, electronic field, automobile field, aircraft field, sports goods field, and military field.

In particular, carbon nanotubes have attracted considerable attention due to their excellent strength and elasticity, but carbon nanotubes having nano-sized diameters and micro-sized lengths are difficult to disperse due to sticking van der Waals force and commercialization. It is a material that is very difficult to apply.

Foam is a material that is used for light weight among various types of materials, and has been developed with technology that adds various functions, and is widely used in clothing equipment, interior materials for construction and automobiles, and toys.

Recently, with the diversification of electronic devices and the development of composite material technology, carbon nanotubes, carbon black, metal, etc. are internalized in the foam to add functionality such as antistatic, electromagnetic wave meter, military radar wave absorber, and vibration / sound absorber. An attempt is being made.

Japanese Patent Application Publication No. 2005-521782 (hereinafter referred to as 'Prior Document 1'), Korean Registered Patent Publication No. 10-1182723 (hereinafter referred to as 'Prior Document 2'), and Korean Patent Publication Publication No. 10-2011-0079470 (hereinafter referred to as 'Prior Document 3') and Japanese Patent Application Publication No. 2008-1866 (hereinafter referred to as 'Prior Document 4').

Prior Art Document 1 relates to a composition in which a conductive polymer foam and an elastomer and a conductive polymer foam and carbon nanotubes for preventing static electricity are mixed with the manufacturing method thereof.

Prior Art Document 2 is a method for producing a conductive polyurethane resin composite in which carbon nanotubes are uniformly dispersed, and relates to a method for preparing a polyurethane resin composite by physically dispersing carbon nanotubes and dispersing them in a polyol and reacting with a diisocyanate compound. .

In the prior arts 1 and 2, the carbon nanotubes are not dispersed in all of the polymer foam, but are concentrated on only the edge, making it difficult to manufacture the foam material of the quality and function desired by the user.

In addition, the prior art document 2 invention is formed of a polyurethane resin containing carbon nanotubes as a film, so that the surface resistance is constant, but when formed in a three-dimensional foam state, the surface resistance of the inside and the surface is difficult to be constant.

Prior Document 3 relates to a polyurethane foam-carbon nanotube composite and a method of manufacturing a composite to form electrical conductivity, including carbon nanotubes to which polyurethane and nickel-coated carbon fibers are added, as a method for manufacturing the same.

Prior Art Document 3 The invention was used to measure the electrical conductivity by cutting a foam specimen to a certain size, but to reduce the resistance, carbon fiber is coated with a metal, but this is difficult or difficult to apply to products requiring weight reduction due to heavy weight. .

Prior Art Document 4 relates to a method for manufacturing a polyurethane sheet and a polyurethane sheet in which carbon nanotubes are dispersed in a resin by the manufacturing method.

Prior Art 4 The invention also produced a sheet because it is difficult to reduce the weight of carbon nanotubes due to the increase in the viscosity of the foam material, thereby increasing the cost in the process and limiting the use of the material.

<Prior Art Document>

(Prior Art 1) Japanese Patent Application Publication No. 2005-521782

(Prior Art 2) Republic of Korea Patent Publication No. 10-1182723

(Prior Art 3) Republic of Korea Patent Publication No. 10-2011-0079470

(Prior Art 4) Japanese Patent Application Publication No. 2008-1866

The present invention is to solve the problems of the prior art, and when the carbon nanotubes are dispersed in a foam material in a conventional manner, carbon nanotubes are not uniformly dispersed in all parts, and the phenomenon occurs only in the edge portion. By solving the problem, we intend to provide a technology for manufacturing a foam material in which carbon nanotubes are evenly distributed throughout the foam material.

In addition, the present invention is to provide a foam material having a light and high electrical conductivity by filling the foam material with 50 to 100% more than the prior art by lowering the viscosity of the carbon nanotube.

Furthermore, the foam material produced by the present invention can provide a foam product having special functions such as antistatic, electromagnetic wave shielding, military radar absorbers, and vibration / sound absorption due to its high and uniform electrical conductivity.

Furthermore, the present invention enables the application of carbon nanotubes to foam materials most efficiently by applying them as a variety of high-tech materials, unlike the foam materials with existing limitations. This makes it possible to be applied to new applications such as aerospace, transportation machinery, construction, and military as lightweight materials with electrical conductivity.

Furthermore, it aims to be used in a variety of drones, lightweight aircraft, unmanned aerial vehicles, helicopters, and vehicles and vehicles that can be controlled by radio waves.

In order to achieve the above object, the present invention includes, as a base material, polypropylene glycol (PPG), polyethylene glycol (PEG), or polytetramethylene ether glycol (PTMEG), any one or more of polyol 25 to 55% by weight; Another basic material is naphthalene-1,5-diisocyanate (NDI), toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), isoprene diisocyanate (IPDI), hexamethylene diisocyanate (HDI) or di 25 to 55% by weight of any one or more isocyanates of meryl diisocyanate (DDI); It is intended to solve the technical problem by providing a foam material in which carbon nanotubes are uniformly dispersed in all parts, characterized in that the dispersed carbon nanotubes are included in an amount of 0.1 to 15% by weight.

In addition, the present invention is characterized in that the silane (silane) is further contained 0.1 to 10% by weight.

The present invention is a step of dispersing carbon nanotubes (S110); The dispersed carbon nanotube and the foam base material are stirred (S120); Stirring the silane on the agitated carbon nanotube and foam base material (S130) and foaming to a desired size (S140); the carbon nanotubes included, having electrical conductivity evenly dispersed throughout It is characterized by a method of manufacturing a foam material.

The present invention is characterized in that the carbon nanotubes in the step (S110) in which the carbon nanotubes are dispersed are multi-walled carbon nanotubes (MWCNT) or single-walled carbon nanotubes (SWCNT).

The present invention is characterized in that the dispersed carbon nanotube and the foam base material are stirred (S120), the carbon nanotube is characterized in that it contains 0.1 to 15% by weight, the foam base material is polyol polypropylene glycol, polyethylene glycol or Any one or more of polytetramethylene ether glycol is contained 25 to 55% by weight; It is characterized in that any one or more of naphthalene-1,5-diisocyanate which is an isocyanate, toluene diisocyanate, diphenylmethane diisocyanate, isoprene diisocyanate, hexamethylene diisocyanate, or dimeryl diisocyanate is contained in 25 to 55% by weight. .

The present invention is characterized in that the silane is stirred at 0.1 to 10% by weight in the step (S130) of stirring the silane on the stirred carbon nanotube and the foam base material.

In the foam material produced by the manufacturing method according to the present invention, the carbon nanotubes are evenly distributed throughout the foam, so that the electrical conductivity of the product is uniform, thereby maintaining light weight.

In addition, according to the present invention, as the carbon nanotubes are dispersed, 50 to 100% by weight of the same viscosity is impregnated to produce a foam material capable of utilizing electrical conductivity of various uses ranging from antistatic materials to electromagnetic shielding materials.

Furthermore, the present invention can be used for various purposes such as aerospace, building interior materials, transportation machinery, military use, etc. by making parts with functions such as anti-static, electromagnetic shielding, military radar absorbers, vibration and sound absorption.

In addition, it can be used in a variety of drones, light aircraft, unmanned aerial vehicles, helicopters, automobiles and vehicles that can be controlled by radio waves.

1 shows the structure of a carbon nanotube.
FIG. 2 shows the molecular structure of carbon nanotubes, which are not dispersed immediately after production, immediately after dispersion, and are 1 year after dispersion, which are confirmed at a magnification of 50,000 using a scanning electron microscope.
3 is a dispersed carbon nanotube.
4 is a flowchart schematically showing a manufacturing process of a foam material containing carbon nanotubes according to the present invention.
5 is a graph showing a comparison of the internal and external electrical resistance of the foam according to the content of silane.
6 is a foam manufactured by a conventional manufacturing method.
7 is a measurement of the surface resistance inside the foam manufactured by a conventional manufacturing method.
8 is a measurement of the surface resistance of the foam produced by the conventional manufacturing method.
9 is a foam produced by the manufacturing method of the present invention.
10 is a measurement of the surface resistance inside the foam produced by the manufacturing method of the present invention.
11 is a measure of the surface resistance of the outer foam produced by the manufacturing method of the present invention.
Figure 12 shows the change in density of the foam according to the silane content.
13 is a measure of the surface resistance of the foam material according to the carbon nanotube content.
<Description of code>
S110: step of dispersing carbon nanotubes
S120: the step of stirring the dispersed carbon nanotubes and foam base material
S130: Stirring silane to the stirred carbon nanotube and foam base material
S140: Step to form the desired size

Hereinafter, the present invention will be described in detail through examples.

The objects, features, and advantages of the present invention will be readily understood through the following examples.

The present invention is not limited to the embodiments disclosed herein, and may be embodied in other forms. The embodiments disclosed herein are provided to sufficiently transmit the spirit of the present invention to a person having ordinary knowledge in the technical field to which the present invention pertains, and all conversions included in the technical spirit and technical scope of the present invention It should be understood to include, for example, equivalents or substitutes.

Therefore, the present invention should not be limited by the following examples, and it should be understood that all transformations included in the technical spirit and technical scope of the present invention are included. That is, a person having ordinary knowledge in the technical field to which the present invention pertains may variously modify the present invention by adding, changing, deleting, or adding components, without departing from the spirit of the present invention as set forth in the claims, or It will be changed, and it will be said that this is also included in the scope of the present invention.

The present invention can be applied to various transformations and can have various embodiments, and specific embodiments are illustrated in the drawings and described in detail. In the drawings, the size of an element or a relative size between elements may be somewhat exaggerated for a clear understanding of the present invention. In addition, the shape of the elements shown in the drawings may be somewhat changed due to variations in the manufacturing process.

Therefore, the embodiments disclosed herein should not be limited to the shapes shown in the drawings, unless otherwise specified, and should be understood to include some degree of modification.

On the other hand, various embodiments of the present invention can be combined with any other embodiments, unless otherwise indicated. Any feature indicated as particularly preferred or advantageous may be combined with any other feature or features indicated as preferred or advantageous. That is, various aspects, features, embodiments or implementations of the invention can be used alone or in various combinations.

It should be understood that the terms used in this specification are for describing specific embodiments and are not intended to be limited by the claims, and all technical terms and scientific terms used in the present specification are common technology unless otherwise stated. It has the same meaning as commonly understood by people with. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In the description of the present invention, if it is determined that a detailed description of known technologies related to the present invention may obscure the subject matter of the present invention, the detailed description will be omitted.

<Example 1. Preparation of foam material in which carbon nanotubes are evenly distributed over all parts>

4 is a flowchart schematically showing a manufacturing process of a foam material containing carbon nanotubes according to the present invention.

1) Step of dispersing carbon nanotubes (S110)

In order to impart electrical conductivity to the foam material, any one or more of carbon black, conductive polymer or dispersed carbon nanotubes can be used.

Carbon black can be used in an amount of 3 to 5% by weight. When a lot of carbon black is used, electrical conductivity is lowered due to a phenomenon in which particles are generated or aggregated without forming, and the amount of charge may be limited.

In addition, when using only carbon black, since the surface resistance is not lowered to a level of 1.0E × 10 ⁹ Ω / sq, it can be limitedly manufactured for the purpose of preventing static electricity.

Preferably, dispersed carbon nanotubes can be used. The carbon nanotube may be either a multi-walled carbon nanotube or a single-walled carbon nanotube, and preferably a multi-walled carbon nanotube may be used, but is not limited thereto.

In addition, the carbon nanotubes are those having a diameter of 30 nm or less, and an aspect ratio of 1: 500 to 3,000 based on a diameter of 1 may be used, but is not limited thereto.

When using the multi-walled carbon nanotubes, it is best to use those having a diameter of 10 to 30 nm.

When using the single-walled carbon nanotubes, it is best to use those having a diameter of 10 nm or less.

The carbon nanotube dispersion method is variously selected such as dry dispersion, wet dispersion, high-speed agitation dispersion, ultrasonic dispersion, dispersion using a solvent or dispersant, and preferably dry dispersion, but is not limited thereto.

The dry dispersion is performed by dispersing in a dispersing device in a state where only the powder is alone, and by dispersing the powder by applying pressure or vibration or electric shock by coating the dispersion liquid, and then drying again, It is the opposite concept.

After the carbon nanotubes are mixed with the foam base material, the carbon nanotubes are dispersed in a dry dispersing method in order to maximize the filling amount while having the electrical conductivity evenly on the front surface of the foam material during foaming.

In addition, since the carbon nanotubes dispersed in the present invention have low resistance and high conductivity, the electrical conductivity can be improved by 100 to 10,000 times with the same content, and the required conductivity of a specific value can be realized with a small amount of carbon nanotubes, thereby increasing the unit price. Can be lowered to maintain cost competitiveness.

Furthermore, uniform quality can be ensured when dispersed carbon nanotubes are used.

2) The dispersed carbon nanotube and the foam base material are stirred (S120)

In order for the dispersed carbon nanotube and foam base material to be stirred, the material can be prepared first.

Foam base materials can include polyols and isocyanates.

The polyol may include any one or more of polypropylene glycol (PPG), polyethylene glycol (PEG), or polytetramethylene ether glycol (PTMEG), preferably polypropylene glycol, but is not limited thereto.

The isocyanate is naphthalene-1,5-diisocyanate (NDI), toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), isoprene diisocyanate (IPDI), hexamethylene diisocyanate (HDI) or dimeryl diisocyanate. Any one or more of (DDI) may be included, preferably toluene diisocyanate or diphenylmethane diisocyanate, but is not limited thereto.

The polyol may be mixed with 25 to 55% by weight, preferably 30 to 55% by weight, and more preferably 40 to 50% by weight, but is not limited thereto.

The isocyanate may be mixed with 25 to 55% by weight, preferably 30 to 55% by weight, and more preferably 40 to 50% by weight, but is not limited thereto.

In addition, the dispersed carbon nanotubes may be mixed with 0.1 to 15% by weight, preferably 0.5 to 12% by weight, more preferably 5 to 10% by weight, but is not limited thereto.

When the content of the polyol, isocyanate, and dispersed carbon nanotubes is exceeded, properties of the foam material may be changed.

The dispersed carbon nanotube and the foam base material may be stirred by a stirrer, and the rotational speed at this time may be performed at 200 to 1,000 rpm, and preferably 500 to 900 rpm, but is not limited thereto.

When the rotational speed is performed at less than 200 rpm, the dispersed carbon nanotubes are not uniformly mixed with the foam base material, and when the rotational speed is exceeded 1,000 rpm, the dispersed carbon nanotubes may be agglomerated.

The dispersed carbon nanotubes and the foam base material can be stirred at high speed, preferably 5-30 seconds, more preferably 10-15 seconds, but the content of the dispersed carbon nanotubes, polyol or isocyanate It is not limited to this, as the performance conditions may be changed depending on the type.

3) Stirring silane on the stirred carbon nanotube and foam base material (S130)

The reason why the carbon nanotubes, foam base material, and silane are not stirred at the same time is because the reactivity of the silane is fast, resulting in poor agitation and foaming workability.

Therefore, in the present invention, the dispersed carbon nanobute and the foam base material may be first stirred and then silane added to agitate.

The silane is isooctyl trimethoxysilane (i-Octyltrimethoxysilane), methyltrimethoxysilane, epoxycyclohexylethyltrimethoxysilane, aminopropyltrimethoxysilane , 3-glycidoxypropyltrimethoxysilane, and chloropropyltriethoxysilane, but is not limited thereto.

In addition, the silane may be included 0.1 to 10% by weight, preferably 0.5 to 6% by weight, but is not limited thereto.

This is when the silane is contained less than 0.1% by weight, the carbon nanotubes are mixed with the foam to produce uneven conductivity during manufacture.

In addition, when less than 0.5% by weight of silane is included, the conductivity of the inner and outer surfaces is not constant when the foam is mixed with carbon nanotubes. , High density makes the foam heavy, making it difficult to use as a lightweight material or difficult to manufacture in foam form.

In the present invention, silane is used to prevent the resulting structures from being united or destroyed when the internal structure of the foam is formed, and to form a uniform structure.

Therefore, silane is used to prevent carbon nanotubes from scattering only to the edges during forming.

The agitated carbon nanotube and foam base material and silane may be stirred by a stirrer, and the rotational speed at this time may be performed under conditions of 200 to 1,000 rpm, preferably 500 to 900 rpm. However, it is not limited thereto.

When the rotational speed of the stirrer is performed under conditions of less than 200 rpm, carbon nanotubes are difficult to mix evenly, and when the rotational speed of the stirrer is performed under conditions of more than 1,000 rpm, it is difficult to control the shape, pore size, and homogeneity of the pores.

When stirring, the stirring speed may be stirred at a high speed, preferably 10 to 60 seconds, more preferably 20 to 30 seconds, but is not limited thereto.

When the mixing is completed, it becomes a foam material having uniform internal and external conductivity in which the carbon nanotubes are mixed.

4) Forming to a desired size (S140)

The foam material mixed with carbon nanotubes is easily mixed with PPG, isocyanate-based and silane at room temperature to form a foam, and the density can be controlled from 100 to 1,000 g / cm ³ .

In addition, the density of the foam material is 100 g / cm ³ depending on the application used. Less than, 1,000g / cm ³ Since the above is also possible, it is not limited to this.

The carbon nanotube mixed foam makes the carbon nanotubes evenly distributed to make parts with functions such as anti-static, electromagnetic shielding, military radar absorbers, and vibration / sound absorption. It can be used for various purposes.

In addition, it can be used in a variety of drones, light aircraft, drones, helicopters, automobiles and aircraft that can be controlled by radio waves, but is not limited thereto.

<Experimental Example 1>

An experiment was performed to measure the surface resistance of the carbon nanotube mixed foam inside and outside.

The experimental group was a foam mixed with carbon nanotubes prepared by the method of <Example 1>, and a control group used a foam mixed with carbon nanotubes prepared by a conventional manufacturing method.

A surface resistance meter was used to measure the surface resistance of the foam.

Figure 6 is a carbon nanotubes produced by a conventional manufacturing method without silane is mixed foam.

7 and 8 are foams manufactured by a conventional manufacturing method, and measure the surface resistance of the foam inside and outside.

9 is a foam produced by the manufacturing method according to the present invention.

10 and 11 are the foams manufactured by the manufacturing method according to the present invention, and measure the surface resistance of the foam inside and outside.

10 to 11, the experimental group confirmed that the internal and external surface resistance was constant at 10 ^4.1 Ω / sq.

On the other hand, in the control group, the internal surface resistance was 10 ^{12.4 to 13.9} Ω / sq, and the external surface resistance was 10 ^{4.8 to 6.4} Ω / sq, confirming that the internal and external surface resistance differed by more than 1,000,000 times.

Through this, it can be seen that the carbon nanotubes are focused to the edge of the foam when manufactured by the conventional manufacturing method, and when the carbon nanotubes are manufactured by the manufacturing method of the present invention, the carbon nanotubes are evenly dispersed in the foam.

<Experimental Example 2>

For the foam mixed with carbon nanotubes, an experiment was conducted to compare the conductivity of the foam inside and the surface according to the silane content.

The foam prepared by the manufacturing method of <Example 1> was used.

The silane was compared by adjusting to 0, 2, 4, 6, 8 and 10% by weight.

5 is a graph showing a comparison of the internal and external electrical resistance of the foam according to the content of silane.

Table 1 below compares the internal and external conductivity according to the silane content.

Silane content
(weight%) Internal resistance
(Ω / sq) External resistance
(Ω / sq) 0 10 ¹³ 10 ^7.07 2 10 ^4.48 10 ^3.86 4 10 ^3.25 10 ^2.77 6 10 ^3.25 10 ^2.76 8 10 ^3.07 10 ^2.71 10 10 ^3.04 10 ^2.84

Looking at <Table 1> and Figure 5, as the content of silane increases, it was confirmed that the internal resistance has 10 ^3.04 ~ 10 ^4.48 Ω / sq, and the external resistance has 10 ^2.71 ~ 10 ^3.86 Ω / sq. .

In addition, when silane is not included, the internal resistance and the external resistance are 10 ¹³ Ω / sq and 10 ^7.07 Ω / sq, respectively, and it can be seen that the difference between the internal and external resistances is about 850,000 times or more.

Furthermore, when silane is included in 2, 4, 6, 8, and 10% by weight, it can be seen that the internal resistance and the external resistance differ by about 4.1 times, 3 times, 3.09 times, 2.3 times, and 1.58 times, respectively. .

This shows that the difference between the internal resistance and the external resistance is significantly lower than the difference between the internal resistance and the external resistance of the foam material that does not contain silane is 850,000 times or more.

Through this, it can be seen that a large difference in external resistance between the inside and the surface of the foam is generated depending on whether silane is included.

In addition, it can be seen that as the silane content increases, the difference in resistance between the inside and the outside decreases, and the carbon nanotubes are evenly mixed on the inside and outside surfaces of the foam.

<Experimental Example 2>

An experiment was conducted to compare the density change of the foam according to the silane content.

The foam prepared by the manufacturing method of <Example 1> was used.

The contents of silane were compared by adjusting to 0, 2, 4, 6, 8 and 10% by weight.

Figure 12 shows the change in density of the foam according to the silane content.

Table 2 below summarizes the density change of the foam according to the silane content.

Silane content
(weight%) density
(g / cm ³ ) 0 0.126 2 0.176 4 0.311 6 0.649 8 0.689 10 0.779

Looking at <Table 2> and FIG. 12, it was confirmed that the density of 0.176 to 0.779 g / cm ³ was increased as the content of silane was increased, which indicates that the density was increased when the content of silane was increased. .

Looking in comparison with the experimental results of Experimental Examples 2 and 3, when 2 to 10% by weight of silane is included, the conductivity of the inner and outer surfaces is constant when the foam is mixed with carbon nanotubes, and has an appropriate density. It can be inferred that it can be used as a lightweight material.

<Experimental Example 3>

An experiment was conducted to compare the conductivity of the foam material according to the carbon nanotube content.

The foam prepared by the manufacturing method of <Example 1> was used.

The dispersed carbon nanotubes were used, and the contents of the carbon nanotubes were compared by adjusting to 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4 and 4.5% by weight.

13 is a measure of the surface resistance of the foam material according to the carbon nanotube content.

The following <Table 3> summarizes the change in the surface resistance of the foam material according to the carbon nanotube content.

Carbon nanotube content
(weight%) Surface resistance
(Ω / sq) 0.5 10 ¹⁴ One 10 ¹⁴ 1.5 10 ⁷ 2 316,227 2.5 63,095 3 31,622 3.5 25,118 4 31,622 4.5 25,118

Referring to <Table 3> and FIG. 13, it was confirmed that as the content of the carbon nanotubes increased, the surface resistance had 10 ⁵ ~ 10 ¹⁴ Ω / sq.

This can be inferred that the carbon nanotubes can be used in the forming material to develop a functional foam material having internal and external uniform electrical conductivity ranging from antistatic to electromagnetic shielding.

The present invention is a foam material in which carbon nanotubes are evenly distributed over the entire part and a method for manufacturing the same, and the carbon nanotubes and the foam base material and silane that have been subjected to dispersion treatment are mixed to uniformly disperse the carbon nanotubes throughout the foam and all over the surface. It is an industrially available invention that can be used in various industries as a lightweight foam material.

Claims (7)

Polypropylene glycol (PPG), polyethylene glycol (PEG) or polytetramethylene ether glycol (PTMEG) of any one of polyol 25 to 55% by weight is included;
Naphthalene-1,5-diisocyanate (NDI), toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), isoprene diisocyanate (IPDI), hexamethylene diisocyanate (HDI) or dimeryl diisocyanate (DDI) 25 to 55% by weight of any one of isocyanate is included;
Dry-dispersed multi-walled carbon nanotubes containing 0.1 to 15% by weight,
In order to prevent the carbon nanotubes from scattering to the edge during foaming, silane is included in an amount of 0.1 to 10% by weight,
The surface resistance of the foam material is 10 ^2.71 to 10 ¹⁴ Ω / sq,
Foam material characterized in that the surface resistance inside and outside the foam is kept constant.
delete The multi-wall carbon nanotubes (MWCNT) are dry-dispersed (S110);
The dispersed carbon nanotube 0.1 to 15% by weight and the foam base material is stirred (S120);
Stirring the silane on the stirred carbon nanotube and foam base material (S130); And
A step (S140) of foaming to a desired size is included,
The foam base material contains 25 to 55% by weight of any one of polyol, polypropylene glycol (PPG), polyethylene glycol (PEG), or polytetramethylene ether glycol (PTMEG);
The isocyanates are naphthalene-1,5-diisocyanate (NDI), toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), isoprene diisocyanate (IPDI), hexamethylene diisocyanate (HDI) or dimeryl diisocyanate ( DDI) any one of 25 to 55% by weight is included,
Silane is contained in an amount of 0.1 to 10% by weight to prevent the carbon nanotubes from scattering to the edge during forming
The surface resistance of the foam material is 10 ^2.71 to 10 ¹⁴ Ω / sq,
A method of manufacturing a foam material, characterized in that the surface resistance of the foam inside and outside is kept constant.
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