KR101564660B1 - Method for producing bicycle frame using carbon nano tube - Google Patents

Abstract

The present invention relates to a method of manufacturing a bicycle frame having excellent adhesive strength, and a method of manufacturing a bicycle frame by using an adhesive containing resin and carbon nanotube.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a bicycle frame using carbon nanotubes,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a bicycle frame, and more particularly, to a method of manufacturing a bicycle frame having excellent bonding strength by adding carbon nanotubes (CNTs).

The bicycle has a manual braking system that operates independently on the front and rear wheels. The front wheel is steered, the rear wheel is driven, the crank mechanism turns the power of the foot of the person into rotational force, and the chain passes through the large sprocket. The frame that forms the body of the bicycle is in the form of rhombus (or diamond), and is made of materials such as chromoly, titanium, aluminum, and carbon. The frame is the most important factor that determines the performance of the bicycle. It consists of Head Tube, Top Tube, Down Tube, Seat Stay, and Chain Stay, The shape, length, thickness, etc. are dependent on the frame geometry of each bodywork. Recently, specialty bicycles use lightweight, high strength carbon frames.

The bicycle frame is manufactured by bonding a plurality of circular pipes or plate members with an adhesive agent. Since the adhesive agent has a large role, if the adhesive strength of the adhesive agent is insufficient, problems such as peeling may occur.
[Prior Art Literature]
[Patent Literature]
1. Japanese Patent Publication No. 4903881 (Mar. 28, 2012)
2. Registration of utility model in Japan Registered Utility Model No. 3137942 (November 21, 2007)

An object of the present invention is to provide a method of manufacturing a bicycle frame excellent in bonding strength.

In order to achieve the above-mentioned object, the present invention provides a method of manufacturing a semiconductor device, comprising the steps of: preparing an adhesive comprising a resin and a carbon nanotube; And a step of manufacturing a bicycle frame using the adhesive thus prepared.

According to one embodiment of the present invention, a bicycle frame can be manufactured by joining a plurality of frame members using the adhesive thus produced.

According to another embodiment of the present invention, a bicycle frame can be manufactured by bonding a plurality of prepregs after preparing a plurality of prepregs by using the produced adhesive as an impregnation resin.

In the present invention, the resin may be at least one selected from an epoxy resin, an unsaturated polyester resin, an acrylic resin, a nylon resin, a phenol resin, a urea resin, a melamine resin, a silicone resin and a urethane resin.

In the present invention, the carbon nanotube may be a single-walled carbon nanotube or a multi-walled carbon nanotube.

In the present invention, the content of the carbon nanotubes may be 0.1 to 2% by weight based on the total weight of the adhesive.

In the present invention, the adhesive strength of the adhesive may be 160 kgf / cm 2 or more.

According to the present invention, by using an adhesive containing carbon nanotubes, a bicycle frame having excellent adhesive strength can be produced. Specifically, the adhesive strength can be improved by 30% or more as compared with the conventional one.

1 is a perspective view showing an example of a bicycle frame.
2 is an exploded perspective view of the bicycle frame.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a bicycle frame, and more particularly, to a method of manufacturing a bicycle frame having excellent bonding strength by adding carbon nanotubes (CNTs).

A method of manufacturing a bicycle frame according to the present invention includes the steps of: preparing an adhesive including a resin and a carbon nanotube; And manufacturing the bicycle frame using the adhesive thus prepared.

According to one embodiment of the present invention, a bicycle frame can be manufactured by joining a plurality of frame members using the adhesive thus produced.

According to another embodiment of the present invention, a bicycle frame can be manufactured by bonding a plurality of prepregs after preparing a plurality of prepregs by using the produced adhesive as an impregnation resin.

According to the present invention, by using an adhesive containing carbon nanotubes, a bicycle frame having excellent adhesive strength can be produced. Specifically, the adhesive strength can be improved by 30% or more as compared with the conventional one.

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

1 is a perspective view showing an example of a bicycle frame. In general, the bicycle frame is supported by connecting at least one support tube 20, 30 between the seat tube 10 and the head tube 40, and the seat tube 10 is provided with a pair of seat stays 50 And a pair of chain stays 60 are connected. The support tube connecting the seat tube 10 and the head tube 40 is generally connected to two tubes, commonly referred to as a top tube 20 and a down tube 30, Some are connected by a tube. It goes without saying that the tube for a bicycle frame of the present invention described below can be applied to a bicycle frame having various structures including the above bicycle structure.

The seat tube 10, the top tube 20, and the down tube 30, which are the most powerful parts of the above-described bicycle structure, are generally made of a cylindrical tube and are made of a metal material such as steel, aluminum, A carbon tube made of a carbon fiber material, a glass tube made of a glass fiber material, or the like.

FIG. 2 is an exploded perspective view of the bicycle frame. The bicycle frame 400 may include a plurality of frame members 410, 420, and 430. Each of the frame members 410, 420, and 430 may have a circular pipe shape as shown in the drawing.

Each of the frame members 410, 420, and 430 may impart various performances such as compression, tension, bending, rigidity, elasticity, surface protection, displacement control,

For example, the frame member 410 may be made of a stretchable synthetic foam material including elasticity and repulsive force to substantially absorb and mitigate external shocks or vibrations. A frame member 410 made of a bubble reinforced plastic material is disposed at the center of the bicycle frame 400. A frame member 420 made of a first carbon material is stacked on the outer periphery of the frame member 410, A frame member 430 composed of a second carbon material having different mechanical properties such as compression, tensile, warpage, twist and the like may be laminated on the outer side of the frame member 420.

The bubble reinforced plastic material may be made by mixing at least two of the metal, polymer, or hollow ceramic materials. The metal may be sufficient to have a certain degree of strength and the polymer may be at least one of vinyl chloride, nylon, synthetic rubber, neoprene, polystyrene, polyethylene, and silicone wherein the synthetic rubber is a mixture of styrene and butadiene, Butadiene rubber (SBR), polychloroprene rubber (CR) which is trans-type polymer of chloroprene, isoprene-isobutylene rubber (IIR) which is mainly composed of isobutylene polymer, butadiene Butadiene rubber (BR), urethane rubber including polyester, and acrylic rubber including ethyl acrylate. In addition to the above synthetic rubber types, there are natural rubber and other synthetic rubbers, but they are excellent in durability and contain most of the elasticity, which is effective in absorbing external impact. Of course, the examples of the synthetic rubber are listed above, but any of synthetic rubber constituting a polymer having elasticity and elasticity can be used. As described above, the frame member 410 made of the bubble-reinforced plastic material itself can sufficiently absorb external impact, which is the main function of the conventional shock absorber. Accordingly, it is possible to absorb external shocks well without a shock absorber in the prior art, thereby reducing the manufacturing cost.

The first carbon material may include UD carbon (unidirectional prepreg Carbon) having a unidirectional property impregnated with a resin to compensate for strength and elasticity characteristics of the bicycle frame 400. At this time, it is preferable that the unidirectionality of the carbon is arranged in the same direction as the longitudinal direction of the bicycle frame 400. This is to supplement the elastic characteristics of the bicycle frame 400.

The second carbon material may include woven carbon for surface protection and torsion prevention such as cracking and breakage prevention by external impact. The thickness of the frame member 430 constituting the outermost frame of the bicycle frame 400 may be the same as the thickness of the frame member 420. However, It is preferable to be thicker than the thickness of the heat sink 420. In addition, the displacement ratio of the frame member 430 is larger than the displacement ratio of the frame member 420, so that the damping relaxation due to the external impact is more effective.

As described above, the bicycle frame 400 may have a multi-layer structure in which a plurality of frame members 410, 420, and 430 are joined. It should be understood that the drawings are only examples of the bicycle frame structure, and various other structures are possible. For example, each of the frame members 410, 420, and 430 may be formed of a plate material. That is, not only a round pipe shape but also a plate-like frame member can be made of a CNT-added prepreg and an adhesive.

It should be noted that the above-described bicycle frame material composition is merely an example, and various other material configurations are possible. Each of the frame members 410, 420, and 430 may be made of different materials independently of each other, or two or more layers of the same material may be laminated. The material of each frame member 410, 420, and 430 may be various materials other than the materials mentioned above, and may be made of a metal material such as chromoly, titanium, aluminum, or the like; Fiber materials such as glass fiber, glass fiber sheet, carbon mesh, carbon fiber, carbon sheet and the like; Wood materials such as plywood; Rubber, plastic materials such as foamed rubber, synthetic rubber, and synthetic resin, or two or more thereof.

According to one embodiment of the present invention, in manufacturing a bicycle frame, a plurality of frame members are bonded using an adhesive including a resin and carbon nanotubes.

The resin constituting the adhesive in the present invention may be at least one selected from epoxy resin, unsaturated polyester resin, acrylic resin, nylon resin, phenol resin, urea resin, melamine resin, silicone resin and urethane resin. An epoxy resin can be preferably used. Among these resins, an epoxy resin or an unsaturated polyester resin can be preferably used.

The epoxy resin which can be used is not particularly limited and includes, for example, bisphenol A type epoxy resin, bisphenol F type epoxy resin, biphenyl type epoxy resin, tetramethylbiphenyl type epoxy resin, novolak type epoxy resin, One or two or more of commonly used epoxy resins such as a thiobiphenyl epoxy resin, a biphenyl sulfone type epoxy resin, a bisphenol A type phenoxy resin, a bisphenol F type phenoxy resin and a fluorene type phenoxy resin can be mixed and used Do.

The unsaturated polyester resin is a colorless transparent thermosetting resin prepared by reacting polybasic acids such as isophthalic acid, maleic anhydride, and fumaric acid with polyhydric alcohols such as propylene glycol and diethylene glycol, and has excellent heat resistance and corrosion resistance.

In the present invention, the carbon nanotube may be a single-walled carbon nanotube or a multi-walled carbon nanotube.

Carbon nanotubes (CNTs) are new materials in which six hexagons of carbon are connected to each other to form a tubular shape. In the process of analyzing the carbon particles formed on the cathode of graphite using the electric discharge method in 1991, Respectively. The hexagon shapes of six carbon are connected to each other to form a tube. The diameter of the tube is only a few to several tens of nanometers and is called a carbon nanotube. The nanometer is 1/10 billionth of a meter, usually one-tenth the thickness of hair. Its electrical conductivity is similar to that of copper, its thermal conductivity is the highest in nature, and its strength is 100 times better than steel. Carbon fibers can be broken even if they are deformed by only 1%, while carbon nanotubes can withstand 15% deformation.

Carbon nanotubes can be divided into single-walled carbon nanotubes (SWNTs) and multi-walled carbon nanotubes (MWNTs). Looking at the physical properties of the carbon nanotubes, single-walled carbon nanotube has a diameter of 1.2 to 3 nm, tension less than 45 GPa, a density of 1.33 to 1.40 g / cc, the electric resistance 10 × 10 ^-6 Ω · m, a current density of 10 A ⁹ / ㎡ under heat conductivity 6000 W / m · K, and less than, the multi-walled carbon nanotubes, the electrical resistance 5.1 diameter of 5 to 100 nm, tension from 50 to ^{300 GPa, × 10 -8 Ω ·} m, thermal conductivity of 3000 W / m · K .

In the present invention, the content of the carbon nanotubes may be 0.1 to 2% by weight, preferably 0.5 to 1.5% by weight based on the total weight of the adhesive. If the content of the carbon nanotubes is too small, the bonding strength may be insufficient, and if the content is too large, other properties may be deteriorated.

In the present invention, the adhesive strength of the adhesive may be 160 kgf / cm 2 or more, and preferably 170 kgf / cm 2 or more.

According to the present invention, when CNTs (carbon nanotubes) in the form of powder are added to various resins such as epoxy to be used as an adhesive for manufacturing a bicycle frame, the adhesiveness is preferably 30% or more, more preferably 40% or more Can be improved.

The adhesive composition according to the present invention may further include a curing agent, a curing accelerator, a filler, a solvent, a dispersing agent, a coupling agent, a leveling agent, and / or a defoaming agent, in addition to the resin and the carbon nanotube described above. The addition amount of the additional components may independently be 0.01 to 30% by weight based on the total weight of the adhesive composition.

As the curing agent, amines, novolac resins, acid anhydrides, polyamides, urea resins, melamine resins, phenol resole derivatives and the like can be used for the epoxy resin, and organic peroxides and tertiary amines can be used for the unsaturated polyester Hexamethylenetetramine can be used as the phenol resin.

Examples of the curing accelerator include imidazole compounds such as methylimidazole, phenylimidazole and 2-ethyl-4-methylimidazole; Basic catalysts such as organic-phosphorus complexes such as triphenylphosphine, ethyltriphenylphosphine iodide and ethyltriphenylphosphine bromide; Boron trifluoride complex, acidic catalysts such as phosphoric acid compounds, and the like can be used.

As the filler, metal oxides, metal hydrates, metal carbonates and the like can be used. DISPERBYK-110 series, DISPERBYK-160 series, DISPERBYK-170 and 171 manufactured by BYK, EFKA-4009, 4015, 4020, 4300, 4330, 4400, 4401, 4500 and 4550 available from EFKA . As the coupling agent, for example, a silane coupling agent such as Z-6040 (manufactured by Dow Corning) may be used. 90D-50 (manufactured by Hansung Industrial Co., Ltd.) can be used. As the antifoaming agent, acrylic or the like can be used. Water, alcohols, ketones, esters, ethers and the like can be used as the solvent.

[0030] A process for manufacturing a bicycle frame according to an embodiment of the present invention will be described. First, each frame member in the form of a circular pipe is manufactured. Each frame member can be formed into a circular pipe shape according to a conventional method. For example, the pipe shape can be formed into an integral shape by blowing it in a mold. Next, an adhesive according to the present invention is applied to each of the manufactured frame members to join them. Thereafter, it may undergo drying and curing processes.

According to another embodiment of the present invention, there is provided a method of manufacturing a bicycle frame manufactured as a CNT-added prepreg. According to this embodiment, after a plurality of prepregs are produced by using the produced adhesive as an impregnation resin, a plurality of prepregs are bonded to manufacture a bicycle frame. That is, the prepreg is manufactured by mixing the carbon nanotubes with the impregnation resin at the time of manufacturing the prepreg, and then using the prepreg manufactured at the time of manufacturing the bicycle frame.

The prepreg may be an intermediate substrate for a fiber-reinforced composite material, and may mean a molding material preliminarily impregnated with a matrix resin in the reinforcing fiber. A prepreg is laminated and heated and pressed to cure the resin, whereby a molded article is formed. Depending on the type of reinforcing fiber, it can be distinguished as a unidirectional prepreg and a cross prepreg. A thermosetting resin such as an epoxy resin is mainly used, but a thermoplastic resin such as polyether ketone can also be used.

A process of manufacturing a frame according to another embodiment of the present invention will be described. First, a plurality of prepregs are manufactured. The shape of the prepreg may be cylindrical or hollow as shown in Fig.

The base material used in the prepreg may be selected from the above-mentioned carbon materials, various metals, various kinds of fibers, various rubbers, and various resins.

The prepreg can be manufactured by impregnating the base material with an adhesive containing CNT as an impregnation resin.

Next, a plurality of prepared prepregs are laminated and bonded. At this time, the impregnated resin adhesive flows from each pre-press to increase the adhesive force between them. Thereafter, it may undergo drying and curing processes.

[Example 1]

An adhesive was prepared by adding 1 wt% of multi-walled carbon nanotubes to an epoxy resin composition (including an epoxy resin and a curing agent). As the epoxy resin, a product manufactured by TDR of Japan was used. Bonded frame members were prepared by using the prepared adhesive, dried and cured.

[Example 2]

Was prepared in the same manner as in Example 1, except that YD128H + CTBN of Kukdo Chemical was used as an epoxy resin. YD128H is a bisphenol-A type amorphous liquid epoxy resin, and CTBN means carboxyl-terminated butadiene acrylonitrile.

[Example 3]

An adhesive was prepared by adding 1 wt% of multi-walled carbon nanotubes to an epoxy resin composition (including an epoxy resin and a curing agent). As the epoxy resin, a product manufactured by TDR of Japan was used. Three circular pipe prepregs were prepared by using the adhesive thus prepared as impregnation resin, and the prepared prepregs were jointed, dried and cured to prepare bicycle frames.

[Comparative Example 1]

The same as Example 1 except that no carbon nanotubes were added.

[Comparative Example 2]

The same as Example 2 except that no carbon nanotubes were added.

[Test Example]

The adhesive strength (ASTM D648) of the bicycle frames manufactured in Examples and Comparative Examples was measured, and the results are shown in Table 1.

division Adhesion strength (kgf / cm 2) Average at least maximum Example 1 176.0 160.3 208.5 Example 2 170.3 161.0 183.0 Comparative Example 1 124.1 104.5 148.9 Comparative Example 2 150.4 137.5 174.1

As can be seen from the above Table 1, the adhesive strength of Example 1 was improved by 41.8% on the basis of Comparative Example 1, and the adhesive strength of Example 2 was improved by 37.2% on the basis of Comparative Example 1.

10: Seat tube
20: Top tube
30: Down tube
40: head tube
50: Seat stay
60: Chain stay
400: Bicycle frame
410, 420, 430: frame member

Claims (7)

Producing an adhesive comprising a resin and a carbon nanotube; And
And manufacturing the bicycle frame using the adhesive thus manufactured,
The bicycle frame is structured such that at least one support tube is supported between the seat tube and the head tube by an adhesive and the seat tube is connected to a pair of seat stays and a pair of chain stays by an adhesive,
At least one of a seat tube, a head tube, a support tube, a seat stay, and a chain stay is made of a multi-layer structure; A first frame member disposed at a central portion and made of a bubble-reinforced plastic material made by mixing at least two of metal, polymer, or hollow ceramic material and synthesizing them; A second frame member stacked on an outer periphery of the first frame member and arranged in the same direction as the longitudinal direction of the bicycle frame, the second frame member being made of a first carbon material which is unidirectional prepreg carbon impregnated with resin; And a third frame member made of a second carbon material which is laminated on the outer periphery of the second frame member and thicker than the thickness of the second frame member and larger than a displacement ratio of the second frame member and is woven carbon,
The first frame member, the second frame member, and the third frame member are manufactured by making the prepared adhesive into a prepreg shape using impregnation resin, joining the respective prepregs,
The resin is an epoxy resin,
The carbon nanotubes are single-walled carbon nanotubes or multi-walled carbon nanotubes,
The content of the carbon nanotubes is 0.5 to 2% by weight based on the total weight of the adhesive,
Wherein the adhesive strength of the adhesive is 160 kgf / cm < 2 > or more. delete delete delete delete delete delete

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