KR101738886B1

KR101738886B1 - The pipe manufacturing method and Plastic pipe for heat conductivity containing graphene

Info

Publication number: KR101738886B1
Application number: KR1020150135111A
Authority: KR
Inventors: 박봉식; 김동기
Original assignee: 강계수; 강민희; 박봉식; 김동기
Priority date: 2015-09-24
Filing date: 2015-09-24
Publication date: 2017-05-23
Also published as: KR20170036218A

Abstract

The present invention relates to a heat exchange pipe, and more particularly, to a heat exchange pipe comprising a synthetic resin heat exchange pipe and a graphene having excellent thermal conductivity inside and on the surface thereof to provide a graphene- A synthetic pipe for conductive heat exchange, and a method of manufacturing the pipe.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a synthetic pipe for conductive heat exchange containing graphene,

The present invention relates to a pipe for heat exchange, and more particularly, to a pipe for heat exchange of a synthetic resin material, which comprises graphene for improving the thermal conductivity and releasing the hot heat to the outside stably over a short period of time A synthetic pipe for conducting heat exchange, and a method for manufacturing the pipe.

Usually, the heat exchanger is designed to cool or heat the outer periphery of the pipe by passing a fluid that maintains a specific temperature as vapor or liquid phase inside the pipe for the heat exchanger. Such a pipe for the heat exchanger is widely used as a refrigeration cycle device, Has been applied.

On the other hand, among the heat exchange pipes, the heating pipes are mainly used for home or vinyl house heating, and iron, copper, and semitransparent synthetic pipes (excel pipes) are mainly used. However, steel pipes are limited in their use due to corrosion problems. Although there are advantages, there are problems such as leakage problem and high price, so we are mainly using an Excel tube in a place where low cost construction is desired or in a vinyl house.

In addition, the refrigerant tube of the heat exchanger is for the purpose of endothermic and heat dissipation, and in recent years, the refrigerant tube has been replaced by a synthetic resin such as plastic whose molding and production costs are reduced. In the plastic heat exchanger, a header is formed at both ends of a refrigerant tube through which a refrigerant flows, and a refrigerant inlet pipe and a refrigerant outlet pipe are provided at one side of the header. In order to manufacture a conventional plastic heat exchanger as described above, a plurality of extruded refrigerant tubes are applied.

On the other hand, in the case of a heat exchange pipe for a synthetic resin used in recent years, the heat transfer rate is improved so that rapid heat exchange and rapid and stable heating in the winter season are continuously being developed.

Korean Patent Application Registration No. 10-0674716.

DISCLOSURE Technical Problem The present invention has been devised to overcome the above problems, and it is an object of the present invention to provide a heat exchange pipe made of a synthetic resin containing graphene having excellent thermal conductivity inside and on the surface thereof to provide a graphene The present invention provides a synthetic pipe for conductive heat exchange and a method for manufacturing the same.

In order to achieve the above-mentioned object, in a synthetic resin pipe for heat exchange,

A thermally conductive material containing graphene in the form of a powder is formed inside the pipe and a thermally conductive coating layer containing the graphene solution is formed on the surface of the pipe,

40 to 50% by weight of graphene powder having a particle size of 50 to 120 mesh with respect to 100% by weight of a thermally conductive material, and 50 to 60% by weight of a pipe raw material,

A graphen member in the shape of a lump formed irregularly in the inside corresponding to the thickness of the pipe, or a graphene band of a plurality of rows,

A coating liquid composed of 0.1 to 5% by weight of a graphene solution, 25 to 30% by weight of a binder, 40 to 50% by weight of a flux powder and 20 to 30% by weight of a solvent is applied to 100% Lt; / RTI >

A pipe manufacturing method for extruding a pipe raw material,

An extrusion molding step in which a thermally conductive material is formed inside the thickness of the pipe while extrusion molding is performed; And

And forming a coating layer on the outer circumferential surface of the extruded pipe to form a thermally conductive coating layer.

As described above, the synthetic resin pipe for conductive heat exchange containing graphene and the method for manufacturing the pipe according to the present invention include graphene in the form of powder having excellent thermal conductivity inside the heat exchange pipe, thereby improving the thermal conductivity And a coating layer containing a graphene component is formed on the surface of the pipe. Thus, the effect of improving thermal conductivity can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional view of a synthetic resin pipe for conductive heat exchange containing graphene of the present invention. FIG.
2 is a schematic view of another embodiment of a synthetic resin pipe for conductive heat exchange containing graphene according to the present invention.
3 is an overall process diagram showing a method for producing a synthetic resin pipe for conductive heat exchange containing graphene according to the present invention.
4 is a view showing a first extrusion step of a method for producing a synthetic resin pipe for conductive heat exchange containing graphene according to the present invention.
FIG. 5 is a diagram illustrating a step of applying a thermally conductive material in a method of manufacturing a synthetic resin pipe for conductive heat exchange containing graphene according to the present invention.
FIG. 6 is a diagram showing a second extrusion step of the method for producing a synthetic resin pipe for conductive heat exchange containing graphene according to the present invention. FIG.
7 is a view illustrating a coating layer forming step of a method for producing a synthetic resin pipe for conductive heat exchange containing graphene 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 may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, 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.

First, according to the synthetic resin pipe for conductive heat exchange containing graphene of the present invention,

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a main part of a synthetic resin pipe for conductive heat exchange containing graphene of the present invention. FIG.

As shown in FIG. 1, the synthetic resin pipe 1 for conductive heat exchange containing graphene according to the present invention is formed by forming a plurality of graphene-containing thermally conductive materials 100 in a thickness of the pipe 1, On the surface of the pipe 1, a thermally conductive coating layer 200 containing a graphene solution is formed.

At this time, the thermally conductive material 100 may be formed in various forms. The thermally conductive material 100 may include 40 to 50% by weight of graphene powder having a particle size of 50 to 120 mesh with respect to 100% by weight of the thermally conductive material, By weight and 50 to 60% by weight.

1, a plurality of graphene members 110, which are in the form of a lump, are formed in the thickness of the pipe 1, Can be irregularly formed.

In forming the thermally conductive material 100 in the pipe 1, a plurality of rows are formed around the pipe 1 as shown in FIG. 2, and a plurality of rows are continuously formed in the longitudinal direction, such as the length of the pipe 1 A plurality of rows of graphene strips 120 can be formed.

On the other hand, among the thermally conductive materials 100 constructed as described above, graphene is a material having a two-dimensional honeycomb structure in which the carbon atoms are connected to each other in a hexagonal shape, It is the thinnest material with thinner thickness of 0.2nm, and it has a high transparency. It can deliver 100 times more current than copper at room temperature, 100 times faster than silicon. In addition, the thermal conductivity is twice as high as the highest diamond. The mechanical strength is more than 200 times stronger than that of steel. However, since it is stretchable, the electrical conductivity is not lost even if stretched or folded. In the present invention, the heat conductivity of the pipe 1 is improved.

Further, the raw material of the pipe to be mixed with the graphene powder is not newly realized, but a raw material (for example, an excel tube raw material in the case of an excel pipe) used for manufacturing a normal thermally conductive pipe can be applied. It is possible to obtain a tight binding force by melt-mixing the raw material of the pipe in the process of extruding the raw material of the pipe.

On the other hand, when the graphene powder and the pipe material are applied as described above, when the graphene powder is applied in an amount of 40 to 50% by weight or more, the partial durability of the pipe may be lowered. The thermal conductivity can be lowered.

That is, by forming the thermally conductive material 100 inside the pipe corresponding to the thickness of the pipe 1 as described above, it is possible to prevent the rapid thermal conductivity of the pipe 1 from being transmitted through the thermally conductive material 100, .

The thermal conductive coating layer 200 formed on the surface of the pipe 1 as shown in FIGS. 1 and 2 enables rapid heat transfer to the outside of the pipe 1, .

At this time, the coating solution is composed of 0.1 to 5% by weight of the graphene solution, 25 to 30% by weight of the binder, 40 to 50% by weight of the flux powder, and 20 to 30% by weight of the solvent, based on 100% ,

The graphene solution is prepared by the following production method.
First, 50 ml of sulfuric acid (H2SO4) was heated to 90 占 폚 using a hot water heater, 10 g of potassium persulfate (K2S2O8) and 10 g of phosphorus pentoxide were added and stirred until the mixture was completely melted. After 12 g of graphite was added and reacted for 4 to 5 hours, the heating was stopped, and the mixture was diluted with 2 L of distilled water for 12 hours while stirring. The diluted solution was filtered using a 0.2 μm nylon filter to remove graphite After that, only the solution is extracted.

Thereafter, 2 L beakers were put in a thermostatic chamber at 0 ° C, 460 mL of sulfuric acid was put in a beaker, and pre-treated grains were placed in a beaker. The mixture was stirred in 60 g of potassium permanganate (KMnO 4) Then, the beaker was taken out and placed in a thermostatic chamber at 35 ° C. and stirred for 2 hours. While maintaining the temperature at 40 ° to 50 ° C. in a thermostatic chamber at 0 ° C., 920 mL of distilled water was divided into 20 to 30 mL and stirred for 2 hours. (H 2 O) and distilled water were mixed in a volume ratio of 1: 2, and the mixture was stirred for 3 hours. Then, hydrogen peroxide (H 2 O 2) Water is added so that the hydrogen ion index (PH) of the solution is set in the range of 5 to 7 to obtain a graphene solution.

The binder is prepared by mixing a selected one of an alkoxide and colloidal silica or a mixture thereof.

The flux powder was selected from among K-Al-F, K-Zn-F and K-Si-F materials.

As the solvent, at least one of 2-propanol, 1-propanol, ethylene glycol and ethyl ether was mixed and used.

Meanwhile, the binder, the flux powder, and the solvent used in the above may be a known material instead of the newly implemented material, and the present invention is preferably applied to the production of a coating solution using the graphene solution.

That is, since the heat generated in the heat exchange pipe is discharged to the outside, the thermal conductivity is improved through the heat conduction coating layer 200 containing the graphene component having excellent thermal conductivity, and the heat exchange rate is improved .

Hereinafter, a method for manufacturing a synthetic resin pipe for conductive heat exchange, which includes the graphene of the present invention,

3 is an overall process diagram showing a method for producing a synthetic resin pipe for conductive heat exchange containing graphene according to the present invention.

The method for producing a synthetic resin pipe for conductive heat exchange containing graphene according to the present invention is carried out including an extrusion molding step (S100) and a coating layer forming step (S200) as shown in Fig.

The extrusion molding step S100 is performed by performing a first extrusion step S110, a thermally conductive material applying step S120 and a second extrusion step S130. For this purpose, .

At this time, the extruding device 10 can be any device capable of extruding the pipe raw material through the ordinary extruding portion 20. First, the extruding portion 20 is provided with the first cylinder 30 in which the pipe raw material is melted and supplied A first forming groove 21 is formed.

In the first forming groove 21, a second forming groove 22 connected to the second cylinder 40 to which the pipe raw material is melted is extended.

A plurality of thermally conductive material dispensers 50 are connected to the extrusion portion 20 so as to supply the thermally conductive material to the first molding groove 21.

The supply structure of the first and second cylinders 30 and 40 of the extrusion apparatus 10 is not newly realized but may be applied to a conventional pipe extrusion apparatus. The feeder 50 or the like, and can replace the feeding structure of a conventional extrusion apparatus.

In the first extrusion step S110, as shown in Fig. 4, the molten pipe material supplied from the first cylinder 30 is extruded through the first forming groove 21, The primary extrudate 2 to be extruded in this way corresponds to the inner peripheral surface of the pipe 1. [

5, the thermally conductive material 100 is introduced into the primary extrudate 2 in the process of extruding the primary extrudate 2 as described above (S120) .

The thermally conductive material 100 has a viscosity of 40 to 50% by weight of graphene powder having a particle size of 50 to 120 mesh and 50 to 60% by weight of a pipe raw material mixed with 100% by weight of the thermally conductive material The branch is composed of a mixture.

When the thermally conductive material 100 having the above-described structure is introduced, the thermally conductive material 100 may be partially introduced into the first extrudate 2 in the form of a lump by using the thermally conductive material dispenser 50, Of the graphene member 110 can be formed.

In addition, when the thermally conductive material 100 is charged, the thermally conductive material can be continuously injected into the first extrudate 2 to form a plurality of rows around the thermally conductive material injector 50, The band 120 can be formed.

That is, in the step of injecting the thermally conductive material (S120), the thermally conductive material 100 containing graphene may be injected at a constant interval to form a lump as shown in FIG. 1, or may be continuously injected 2, in which the thermally conductive material 100 to be formed is mixed with the primary extrudate 2 through the raw material of the pipe to enable tight binding.

The secondary extrusion step S130 is performed by performing extrusion through the second molding groove 22 so that the thermally conductive material 100 is wound around the primary extrudate 2 as shown in FIG. Conductive material 100 by continuously extruding the primary extrudate 2 in a state in which the second cylinder 40 is formed and simultaneously supplying the molten pipe raw material supplied from the second cylinder 40 to the second molding groove 22. [ And the secondary extrudate 3 is extruded so as to surround the primary extrudate 2. The secondary extrudate 3 thus extruded corresponds to the outer peripheral surface of the pipe 1, (1) is completed.

That is, in the extrusion molding step (S100), the pipe material is extruded to form the pipe (1), and the thermally conductive material (100) can be formed inside the pipe corresponding to the thickness of the pipe (1).

Thereafter, the coating layer forming step (S200)

7, a coating liquid is applied to the outer circumferential surface of the pipe 1 obtained as described above to form the thermally conductive coating layer 200. In this case, the coating method is not newly realized, and a conventional liquid spraying method or painting method Can be applied.

On the other hand, the coating liquid to be coated as described above preferably contains 0.1 to 5% by weight of the graphene solution, 25 to 30% by weight of the binder, 40 to 50% by weight of the flux powder, 20 to 30% %, &Lt; / RTI >

At this time, a method for producing the graphene solution is as follows.
First, 50 ml of sulfuric acid (H2SO4) was heated to 90 占 폚 using a hot water heater, 10 g of potassium persulfate (K2S2O8) and 10 g of phosphorus pentoxide were added and stirred until the mixture was completely melted. After 12 g of graphite was added and reacted for 4 to 5 hours, the heating was stopped, and the mixture was diluted with 2 L of distilled water for 12 hours while stirring. The diluted solution was filtered using a 0.2 μm nylon filter to remove graphite After that, only the solution is extracted.

The flux powder was selected from among K-Al-F, K-Zn-F and K-Si-F materials.

That is, the coating liquid is coated on the outer peripheral surface of the extruded pipe 1 to form the heat conduction coating layer 200, thereby completing the manufacture of the synthetic pipe for conductive heat exchange containing graphene.

As described above, the synthetic resin pipe for conductive heat exchange containing graphene and the method for manufacturing the pipe according to the present invention are capable of manufacturing pipes through a series of processes. The pipe thus manufactured contains graphene having excellent thermal conductivity The thermal conductivity with the outside of the fluid flowing inside the pipe is remarkably improved.

1: pipe 100: thermally conductive material
110: graphen member 120: graphene band
200: heat conduction coating layer

Claims

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A pipe manufacturing method for extruding a pipe raw material,
An extrusion molding step (S100) of extruding a thermally conductive material into the thickness of the pipe while forming a thermally conductive material; And
(S200) for forming a thermally conductive coating layer (200) by applying a coating liquid to an outer peripheral surface of the extruded pipe,
In the coating layer forming step S200,
Wherein the coating liquid is composed of 0.1 to 5 wt% of a graphene solution, 25 to 30 wt% of a binder, 40 to 50 wt% of a flux powder, and 20 to 30 wt% of a solvent, based on 100 wt%
The graphene solution,
50 ml of sulfuric acid (H2SO4) was heated to 90 占 폚 using a hot water bath, 10 g of potassium persulfide (K2S2O8) and 10 g of phosphorus pentoxide were added, and the mixture was stirred until the mixture melted.
After cooling the stirred mixture to 80 캜, 12 g of graphite was added and reacted for 4 to 5 hours, then heating was stopped and diluted with 2 L of distilled water for 12 hours while stirring;
Filtering the diluted solution by using a nylon filter of 0.2 mu m to extract graphite;
Preparing the extracted solution with a 2 L beaker in a thermostatic oven at 0 ° C, adding 460 mL of sulfuric acid into a beaker, adding pre-treated graphene to the beaker and stirring;
60 g of potassium permanganate (KMnO4) was added to the beaker and stirred until the mixture was completely dissolved. Then, the beaker was taken out, placed in a 35 ° C thermostatic chamber and stirred for 2 hours;
The mixture was further stirred in a constant temperature oven maintained at a temperature of 40 to 50 ° C for 2 hours while 920 mL of distilled water was divided into 20 to 30 mL, followed by 2.8 L of water and diluting with stirring for 3 hours;
(H 2 O) and distilled water at a volume ratio of 1: 2 is added to 100 wt% of the diluted water, and then the solution has a hydrogen ion index (PH) of 5 To 7; and a graphene solution obtained by the method of manufacturing graphene. The method for producing a synthetic pipe for conductive heat exchange according to claim 1,

8. The method of claim 7,
In the extrusion molding step (SlOO)
A first molding groove 21 connected to the first cylinder 30 in which the pipe material is melted and supplied and a second molding groove 21 extending from the first molding groove 21, And a second molding groove 22 connected to the second cylinder 40 to be melted and supplied to the first molding groove 21. Around the extrusion portion 20 are formed a plurality of thermally conductive materials The injector 50 is connected,
A first extrusion step (S110) of extruding a primary extrudate corresponding to an inner circumferential surface of the pipe through the first forming groove (21);
A step S120 of injecting a thermally conductive material into the primary extrudate of the pipe extruded through the thermally conductive material injector 50 to form a thermally conductive material; And
A secondary extrusion step (S130) of supplying a pipe raw material to the outer peripheral surface of the pipe so as to cover the thermally conductive material around the primary extrudate through the second forming groove 22 and obtaining a pipe by extruding the secondary extruded product Wherein the graphene-containing synthetic resin pipe is manufactured by the following method.

9. The method of claim 8,
The thermally-
A mixture of 40 to 50% by weight of graphene powder having a particle size of 50 to 120 mesh based on 100% by weight of the thermally conductive material, and 50 to 60% by weight of a raw material for a pipe,
And a plurality of graphene members which are irregularly injected and supplied into the primary extrudate through the thermally conductive material injector (50) in the step of injecting the thermally conductive material (S120) to form a massive graphene member METHOD FOR MANUFACTURING PIPE PIPE FOR CONDUCTIVE HEAT EXCHANGING.

9. The method of claim 8,
The thermally-
A mixture of 40 to 50% by weight of graphene powder having a particle size of 50 to 120 mesh based on 100% by weight of the thermally conductive material, and 50 to 60% by weight of a raw material for a pipe,
And a plurality of rows of graphene strips are injected and supplied in a plurality of rows continuously around the first extrudate through the thermally conductive material injector 50 in the step of injecting the thermally conductive material S120. Method of manufacturing a synthetic pipe for heat exchange.

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8. The method of claim 7,
The binder,
An alkoxide, and a colloidal silica, or a mixture thereof,
The flux powder,
A K-Al-F system, a K-Zn-F system, and a K-Si-F system material,
The solvent,
Propanol, 2-propanol, 1-propanol, ethylene glycol, and ethyl ether.