KR102197235B1 - Functional carbon fiber fabric including binder powder and functional particles and menufacturing method thereof - Google Patents

Abstract

The present invention includes: a functional carbon fiber fabric in which functional particles applied to at least one surface of a carbon fiber fabric are fixed by fusion of binder powder through heat, so as to solve a filtering problem by the carbon fiber fabric as a reinforcing material in a manufacturing process of a thermosetting carbon fiber composite material using RTM molding, etc., thereby uniformly distributing functional particles or fillers, and improving the functionality and strength of the carbon fiber composite material; and a method of manufacturing the functional carbon fiber fabric.

Description

Functional carbon fiber fabric containing binder powder and functional particles, and a manufacturing method thereof TECHNICAL FIELD [FUNCTIONAL CARBON FIBER FABRIC INCLUDING BINDER POWDER AND FUNCTIONAL PARTICLES AND MENUFACTURING METHOD THEREOF}

The present invention is a carbon used in RTM (Resin Transfer Molding), Va-RTM (Vacu㎛ Assisted Resin Transfer Molding), RIM (Resin Injection Molding) molding methods mainly used for thermosetting carbon fiber composite materials. It relates to a functional carbon fiber fabric capable of imparting functionality and improving strength to a fiber fabric and a method of manufacturing the same.

RTM (Resin Transfer Molding), Va-RTM (Vacu㎛ Assisted Resin Transfer Molding), and RIM (Resin Injection Molding) molding methods mainly used for thermosetting carbon fiber composite materials are carbon fiber fabrics, which are reinforced materials. The resin is injected into and molded. In RTM molding, a carbon fiber composite material is manufactured by laminating the fabric on a press mold, closing the upper mold, and adding a matrix resin. As such, RTM molding is a method in which the matrix resin is formed while pushing out empty spaces, so product properties comparable to vacuum molding can be expected, and it has good workability and is advantageous for mass production.

When manufacturing a thermosetting carbon fiber composite material using RTM molding, functional particles or fillers are dispersed and injected into the resin in order to impart functionality and improve strength to the composite material. However, in the process of introducing the resin into the mold, the carbon fiber fabric, which is a reinforcing material, acts as a filter, causing problems in introducing functional particles or fillers dispersed in the resin. By filtering out the functional particles or fillers dispersed in the resin in which the carbon fiber fabric, which is a reinforcing material, is filtered, the functional particles or fillers dispersed in the resin are not evenly distributed on the carbon fiber fabric, and distributed in a specific position or direction. A problem occurs. In this way, when the functional particles or fillers are unevenly distributed on the carbon fiber fabric, the performance of the required functional particles is not properly expressed in the carbon fiber composite material, resulting in a problem of deteriorating physical properties.

Korean Patent Laid-Open Publication No. 10-2018-0136639 is an invention for a method of manufacturing a composite material separator for a battery using a spread tow carbon fiber fabric, and a polymer material containing conductive powder, which is a functional particle, is converted into carbon fiber by resin transfer molding (RTM). It includes a composition that impregnates the fabric. However, the above patent only discloses the use of conductive powder as functional particles, and does not solve the problem caused by the above-described carbon fiber fabric acting as a filter.

Republic of Korea Patent Publication No. 10-2018-0136639 (2018.12.26)

The present invention has been devised to solve the above problems, and evenly distributes functional particles or fillers by solving the filtering problem by carbon fiber fabric as a reinforcing material in the manufacturing process of a thermosetting carbon fiber composite material using RTM molding, etc. Thus, it is an object of the present invention to provide a functional carbon fiber fabric capable of improving the functionality and strength of a carbon fiber composite material and a method of manufacturing the same.

The above and other objects and advantages of the present invention will become more apparent from the following description of preferred embodiments.

The above object is achieved by a functional carbon fiber fabric, in which functional particles applied to at least one surface of the carbon fiber fabric are fixed by fusion of a binder powder by heat.

Preferably, the binder powder may be any one of a bisphenol A-based or bisphenol-based composition.

Preferably, the average particle diameter (d50) of the functional particles may be 3 nm to 600 μm, and when the functional particles are fibrous, the diameter may be 3 nm to 50 μm, and the length may be 20 μm to 25.4 mm.

Preferably, the functional particles may be formed on the carbon fiber fabric with a thickness of 3nm to 600㎛.

Preferably, the thickness ratio of the functional particles and the carbon fiber fabric may be 0.000005:1 to 1:1.

Preferably, it may include 0.5 to 20 parts by weight of the binder powder and 0.1 to 20 parts by weight of the functional particles relative to 100 weight ratio of the carbon fiber fabric.

Preferably, the functional particles are silica, diatomaceous earth, alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, lead oxide, antimony oxide, ferrite, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, basic magnesium carbonate, calcium carbonate, Magnesium carbonate, zinc carbonate, barium carbonate, dosonite, hydrotalcite, calcium sulfate, gypsum, barium sulfate, gypsum fiber, calcium silicate, talc, sepiolite, clay, mica, montmorillonite, bentonite, activated clay, imogolite, serie Sight, glass fiber, glass beads, glass bubble, silica-based balun, aluminum nitride, silicon nitride, boron nitride, carbon black, graphite, carbon fiber, carbon balun, charcoal powder, CNT, potassium titanate, MOS, lead zirconate titanate, silicon carbide , Stainless fiber, zinc borate, slag fiber, Teflon powder, wood powder, pulp, rubber powder, aramid fiber, and at least one particle selected from metal particles.

Preferably, the melting point of the binder powder may be 50 to 150 ℃.

Preferably, the melting point of the functional particles may be at least 10° C. higher than the melting point of the binder powder.

Preferably, the number of strands of fibers constituting the carbon fiber fabric is 3,000 to 50,000, and the weight per unit area may be 100 to 600 g/m ² .

Preferably, the carbon fiber fabric may be any one of plain weave, twill weave, runner weave and NCF, UD weave.

Preferably, in the carbon fiber fabric, the area ratio occupied by the carbon fiber on the cotton may be 75% or more.

In addition, the above object is achieved by a carbon fiber composite material using a functional carbon fiber fabric manufactured through the RTM molding method in which the functional carbon fiber fabric according to the above description is put into an RTM molding mold and a matrix resin is injected.

Preferably, the matrix resin may include any one resin selected from an epoxy resin, a polyester resin, a vinyl ester resin, and a polyphenol resin.

In addition, the above object is the first step of spraying the binder powder using a scatter on the surface of the carbon fiber fabric unraveled at a predetermined speed, and spraying the functional particles using a scatter on the carbon fiber fabric sprayed with the binder powder A second step and a third step of fixing the functional particles to the surface of the carbon fiber fabric by heat treatment of the carbon fiber fabric sprayed with the binder powder and the functional particles are achieved by a method for producing a functional carbon fiber fabric.

Preferably, in the first step and the second step, the binder powder or functional particles are filled with the binder particles or functional particles in the micro grooves formed on the surface of the scatter roll, and the binder powder or functional particles filled in the micro grooves are shaken off to make carbon It can be carried out by spreading evenly on the fibrous fabric.

According to the present invention, in the RTM, Va-RTM and RIM (Resin Injection Molding) molding methods used in the molding of thermosetting carbon fiber composite materials, binder powder and functional particles are directly applied in powder form on carbon fiber fabrics, and By attaching to form a functional carbon fiber fabric, the carbon fiber fabric does not act as a filter for the functional particles contained in the matrix resin during the RTM molding process, thereby uniformly distributing functional particles, enhancing the functionality and strength of the carbon fiber composite material. I can make it.

However, the effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a flow chart showing a method of manufacturing a functional carbon fiber fabric according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to embodiments of the present invention and drawings. These examples are only illustratively presented to illustrate the present invention in more detail, and it will be apparent to those of ordinary skill in the art that the scope of the present invention is not limited by these examples. .

In the drawings, the thicknesses are enlarged to clearly express various layers and regions. The same reference numerals are assigned to similar parts throughout the specification. When a part of a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the case where the other part is "directly above", but also the case where there is another part in the middle. Conversely, when one part is "directly above" another part, it means that there is no other part in the middle.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control. Also, although methods and materials similar or equivalent to those described herein may be used in the practice or testing of the present invention, suitable methods and materials are described herein.

In the functional carbon fiber fabric according to an embodiment of the present invention, a binder powder and a functional particle (or filler) are applied in a powder form on at least one side of the carbon fiber fabric, and the functional particles on the carbon fiber fabric by fusion of the binder powder by heat. Can be uniformly fixed (attached).

The present invention is in the RTM (Resin Transfer Molding, resin transfer molding), Va-RTM (Vacu㎛ Assisted Resin Transfer Molding) and RIM (Resin Injection Molding, resin injection molding) molding method used for molding a thermosetting carbon fiber composite material, By introducing functional particles into the carbon fiber fabric used as a reinforcing material, there is no need to mix the functional particles into the matrix resin, so the functional particles are evenly distributed on the surface of the carbon fiber fabric, thereby improving the functionality and strength of the carbon fiber composite material. I can.

In a more specific way, binder powder and functional particles are coated on the surface in powder form on the carbon fiber fabric, which is a reinforcing material, and heat-treated to place the binder powder between the carbon fiber fabric and the functional particles, and functional particles on the carbon fiber fabric. To be evenly attached. In this way, the powdery binder is first sprayed on the carbon fiber fabric, and then the powdery functional particles are sprayed, so that the functional particles overlapping with the binder particles adhere to the carbon fiber fabric. At this time, the binder powder may be fused and positioned on the surface of the carbon fiber fabric to which the functional particles are not attached. Preferably, the binder powder to which the functional particles are not attached is fused to the surface of the carbon fiber fabric, or the binder powder is protruded together with the functional particles attached, so that the fusion of the preform is prevented during preforming of the carbon fiber fabric. Make it possible.

It is preferable that the binder powder is solid at room temperature, has a softening point when heated, and is a material having adhesion or adhesion. In addition, the binder powder must be compatible with the material used as the matrix resin. That is, the binder powder has compatibility with the matrix resin so that the matrix resin and the carbon fiber fabric injected in the manufacturing process of the carbon fiber composite material such as RTM molding can be closely adhered to each other.

It is preferable that such a binder powder contains a bisphenol A system or a bisphenol composition. However, the binder powder is not limited to the above-described bisphenol composition, and thermosetting resins such as polyester, vinyl ester, and polyurethane and thermoplastics such as polyethylene, polyamide, ABS, acrylic resin, polypropylene resin, and polyvinyl alcohol It may contain resin.

In one embodiment, in the case of the functional particles, the average particle diameter (d50) is preferably within 3 nm to 600 μm, more preferably 10 nm to 400 μm, and even more preferably 15 μm to 200 μm. If the average particle diameter of the functional particles is less than 3 nm, it is scattered according to the flow of air during the scattering process, making it difficult to adhere, and if it is larger than 600 μm, even if it is attached to the substrate, it is likely to be removed by physical force.

The spherical functional particles have the same particle diameter and the same thickness after treatment, but when the functional particles are fibrous, the thickness may be thicker than the diameter due to overlapping. Accordingly, in one embodiment, when the functional particles are fibrous, the diameter is preferably 3 nm to 50 μm, and the length is 20 μm to 25.4 mm. Functional particles having a fibrous shape of such a diameter correspond to glass fiber chop (GF Chop) in carbon nanotubes (CNT), and are effective in increasing functionality and physical properties.

In one embodiment, the functional particles are preferably formed in a thickness of 3 nm to 600 μm in a carbon fiber fabric, more preferably 10 nm to 400 μm, and even more preferably 15 μm to 200 μm. . Since the functional particles do not completely fill the surface of the carbon fiber fabric, the thickness of the functional particles is preferably measured using a thickness gauge having a diameter of 10 mm or more. The thickness range of these functional particles has the same range as the particle diameter of the functional particles described above.

In one embodiment, the thickness ratio of the functional particles and the carbon fiber fabric is preferably 0.000005:1 to 1:1. If the thickness ratio of the functional particles and the carbon fiber fabric is less than 0.000005, the effect of increasing the performance is insufficient, and if it exceeds 1:1, the physical properties are deteriorated and may be eliminated during the handling of the fabric.

In one embodiment, it is preferable that the binder powder is 0.5 to 20 parts by weight, and the functional particles are 0.1 to 20 parts by weight, relative to 100 parts by weight of the carbon fiber fabric. If the content of the binder powder is less than 0.5 parts by weight, the adhesion of the functional particles is low and the adhesion between substrates is also low, and if the content of the binder powder exceeds 20 parts by weight, impregnation of the matrix resin is hindered in the subsequent RTM molding process, etc. As a result, it becomes a factor causing a decrease in physical properties. In addition, when the content of the functional particles is less than 0.1 parts by weight, the effect of increasing the performance is insufficient, and when the content of the functional particles exceeds 20 parts by weight, the physical properties are deteriorated.

In one embodiment, the functional particles are silica, diatomaceous earth, alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, lead oxide, antimony oxide, ferrite, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, basic magnesium carbonate, calcium carbonate , Magnesium carbonate, zinc carbonate, barium carbonate, dosonite, hydrotalcite, calcium sulfate, gypsum, barium sulfate, gypsum fiber, calcium silicate, talc, sepiolite, clay, mica, montmorillonite, bentonite, activated clay, imogolite, Sericite, glass fiber, glass beads, glass bubble, silica-based balun, aluminum nitride, silicon nitride, boron nitride, carbon black, graphite, carbon fiber, carbon balun, charcoal powder, CNT, potassium titanate, MOS, lead zirconate titanate, carbonization It is preferable that it is at least one particle selected from silicon, stainless fiber, zinc borate, slag fiber, Teflon powder, wood powder, pulp, rubber powder, aramid fiber and metal particles.

Functional carbon fiber fabric according to an embodiment of the present invention is a matrix such as RTM (Resin Transfer Molding), Va-RTM (Vacu㎛ Assisted Resin Transfer Molding), and RIM (Resin Injection Molding) molding. It can be made of a carbon fiber composite material through the process of transferring and injecting resin. When manufacturing a carbon fiber composite material, although an epoxy resin is not used as a matrix resin, polyester, vinyl ester, and polyphenol resins may be included.

In one embodiment, the binder powder (powder binder) applied to the carbon fiber fabric preferably has a melting point of 50 to 150°C, and the melting point of the functional particles is preferably at least 10°C higher than the melting point of the binder powder. When the melting point of the functional particles has a difference of less than or equal to 10° C. from the melting point of the binder powder, the functional particles may be melted, softened, or damaged during a heat treatment for fusing the binder powder. In addition, if the melting point of the binder powder is less than 50°C, different carbon fiber fabrics adhere to each other at room temperature, which interferes with handling, and if the temperature exceeds 150°C, the heating temperature becomes too high during preform production, and resin impregnation is prevented in RTM molding. There is a problem of narrowing the process window in RTM molding because it becomes an impeding factor or increases the RTM molding temperature.

In one embodiment, it is preferable that the number of strands of the carbon fiber fabric is 3,000 to 50,000. When the number of fiber strands of the carbon fiber fabric is less than 3,000, there is a problem that the price of the material increases excessively, and when it exceeds 50,000, there is a problem that the material property nonuniformity increases.

In addition, it is preferable that the carbon fiber fabric has a weight per unit area of 100 to 600 g/m ² . If the weight per unit area of the carbon fiber fabric is less than 100g/m ² , the price of the material rises excessively, and there is a problem that the number of layers increases in the lamination process, and if it exceeds 600 g/m ² , the formability decreases in the preform process and impregnation There is a problem of deteriorating sex.

In one embodiment, the carbon fiber fabric preferably has an area ratio of 75% or more, more preferably 80% or more, and even more preferably 85% or more on the surface of the carbon fiber fabric. If the area ratio occupied by the carbon fiber is less than 75%, the uniform distribution of the functional particles is hindered, and the presence of a large portion of the matrix resin when impregnated with the resin prevents the problem of not increasing physical properties or rather inhibiting the physical properties by introducing the functional particles. Have.

In one embodiment, the particle adhesion of the functional carbon fiber fabric is preferably 80% or more. This is because when the particle adhesion is less than 80%, functional particles are easily released from the carbon fiber fabric, and the effect of improving physical properties by the functional particles in the functional carbon fiber fabric is insignificant.

In one embodiment, the weaving method of the carbon fiber fabric is preferably in the form of any one of plain weave, twill weave, juja weave and NCF, UD fabric.

1 is a flow chart showing a method of manufacturing a functional carbon fiber fabric according to an embodiment of the present invention.

Referring to FIG. 1, a method of manufacturing a functional carbon fiber fabric according to an embodiment of the present invention includes a first step (S101) of spraying a binder powder using a scatter on the surface of a carbon fiber fabric, a binder powder. The second step (S102) of spraying functional particles using a scatter on the spread carbon fiber fabric, and heat treatment of the carbon fiber fabric sprayed with binder powder and functional particles to fix the functional particles on the surface of the carbon fiber fabric. It includes a third step (S103).

First, in the first step (S101) of spraying the binder powder on the surface of the carbon fiber fabric using a scatter, the carbon fiber fabric wound on the bobbin or other devices is unwound at a predetermined constant speed, while the binder powder is removed. Spray it on the surface of carbon fiber fabric using a scatter.

Next, in the second step (S102) of spraying the functional particles using a scatter on the carbon fiber fabric sprayed with the binder powder, when the binder powder is sprayed on the surface of the carbon fiber fabric, the carbon fiber fabric with the binder powder By spraying the functional particles using a scatter, the binder powder is located between the carbon fiber fabric and the functional particles.

Next, in the third step (S103) of fixing the functional particles to the surface of the carbon fiber fabric by heat treating the carbon fiber fabric sprayed with the binder powder and the functional particles, the binder powder fuses the functional particles to the carbon fiber fabric through heat treatment. . At this time, the heat treatment temperature is preferably not less than the melting point of the binder powder and less than the melting point of the functional particles. In addition, the heat treatment method in the third step is preferably an IR heater method.

The scattering method in the first step (S101) and the second step (S102) is a method of using a scatter roll, filling the fine grooves formed on the surface of the scatter roll with binder particles and functional particles, and filling the fine grooves. By removing the binder powder and functional particles and spreading them evenly on the carbon fiber fabric, uniform introduction of the functional particles becomes possible. In this case, an air spray device, a fixed brush, a brush roll, or a method in which vibration is applied to the brush may be used as a device for removing the binder powder and functional particles filled in the fine grooves of the scatter roll.

Hereinafter, the configuration of the present invention and effects thereof will be described in more detail through Examples and Comparative Examples. However, this embodiment is intended to specifically illustrate the present invention, and the scope of the present invention is not limited to these examples.

[Example]

[Example 1]

Binder processor (W2000, Nitotechno) scattering bisphenol-based binder powder (Huntsman, LT3366) on carbon fiber fabric (T700SC-12K-50C, plain weave, 300gsm, Toray) with a thickness of 300㎛ and a weight of 300g/m ² G) is used in the range of 1.5 g/m ² , and the functional particles, glass bubble K15 (diameter 105 μm, 3M company), are sprayed at 1.5 g/m ² , and the binder powder melts with an IR heater. Heat treatment until a functional carbon fiber fabric was prepared.

After laminating 4 sheets of the manufactured functional carbon fiber fabrics, put them in the RTM mold and mix them at a weight ratio of KER828 resin:TR-C38 hardener =100:95 to inject resin.At this time, the molding temperature was maintained at 120℃ for 10 minutes. A molded article was obtained.

[Example 2]

Example 1 having a thickness of 600㎛ in the weight is used to 600g / m ² of carbon fiber fabric, and changing the salporyang of the binder powder to 15g / m ^2, the salporyang to the functional particles of glass bubbles (diameter 600㎛) A molded article was manufactured in the same manner as in Example 1 except for changing to 15 g/m ² .

[Example 3]

Carried out for changing the salporyang of the binder powder in Example 1 to 15g / m ^2, and changes the functional particles of glass fiber chopped salporyang by a (101C, 13㎛ diameter, length 12mm, Owens Corning) to 15g / m ^2, except embodiments A molded article was manufactured in the same manner as in Example 1.

[Example 4]

In Example 1, in the same manner as in Example 1, except that the spraying amount of the binder powder was changed to 15 g/m ² , the functional particles were CNT (diameter 5 nm, length 10 μm), and the spray amount was changed to 0.3 g/m ² . A molded article was prepared.

[Example 5]

Example 1 changing the salporyang of the binder powder in a 15g / m ² and, CNT the functional particles (diameter: 5nm, 10㎛ length) was changed as to the salporyang with 9g / m ² except that the molded product in the same manner as in Example 1 Was prepared.

[Example 6]

Example 1 changing the salporyang of the binder powder in a 15g / m ² and, CNT the functional particles (diameter: 5nm, 10㎛ length) was changed as to the salporyang to 15g / m ² except that the molded product in the same manner as in Example 1 Was prepared.

[Comparative Example 1]

After laminating 4 sheets of carbon fiber fabric (T700SC-12K-50C, plain weave, 300gsm, Toray) with a thickness of 300㎛ and a weight of 300g/m ² , put it in an RTM mold and put KER828 resin: TR-C38 hardener = 100:95 Resin was injected by mixing at a weight part ratio, and the molding temperature was maintained at 120° C. for 10 minutes to prepare a molded article.

[Comparative Example 2]

In Example 1, a molded article was prepared in the same manner as in Example 1, except that the spray amount of the binder powder was changed to 1.2 g/m ² and the spray amount of the glass bubble K15 (diameter 105 μm, 3M company) was changed to 15 g/m ² . Was prepared.

[Comparative Example 3]

In Example 1, a molded article was prepared in the same manner as in Example 1, except that the spraying amount of the binder powder was changed to 65 g/m ² and the spraying amount of the glass bubble K15 (diameter 105 μm, 3M company) was changed to 15 g/m ² . I did.

[Comparative Example 4]

In Example 1, in the same manner as in Example 1, except that the spraying amount of the binder powder was changed to 15 g/m ² , the functional particles were CNT (diameter 5 nm, length 10 μm) and the spray amount was changed to 0.1 g/m ² . A molded article was prepared.

[Comparative Example 5]

The same as in Example 1 except that the spraying amount of the binder powder in Example 1 was changed to 15 g/m ² , and the spraying amount was changed to 65 g/m ² using the functional particles as glass fiber chops (diameter 13 μm, length 25.4 mm). A molded article was manufactured by the method.

[Comparative Example 6]

Example 1, the same procedure as in except for changing the salporyang the binder powder to 65g / m ^2, and by the functional particles of glass bubbles K15 (diameter 105㎛, 3M Co.) to change the salporyang to 65g / m ² Example 1 from To prepare a molded article.

[Comparative Example 7]

In Example 1, a molded article was manufactured in the same manner as in Example 1, except that the diameter of the glass bubble was 2 nm.

[Comparative Example 8]

In Example 1, a molded article was manufactured in the same manner as in Example 1, except that the diameter of the glass bubble was 650 μm.

[Comparative Example 9]

In Example 4, a molded article was manufactured in the same manner as in Example 4, except that the thickness of the carbon fiber fabric was 1200 μm.

[Comparative Example 10]

In Example 2, a molded article was manufactured in the same manner as in Example 2, except that the thickness of the carbon fiber fabric was 550 μm.

For the molded article using the functional carbon fiber fabric manufactured according to the above Examples and Comparative Examples, a specimen was cut using a diamond cutter and each physical property was measured and evaluated as follows.

[Experimental Example]

(1) Measurement of bending strength

Evaluation is conducted based on ASTM D 790 measurement method and 3-point bending test.

(2) Measurement of flexural modulus

Evaluation is conducted based on ASTM D 790 measurement method and 3-point bending test.

(3) Impact strength measurement

Conduct evaluation based on ISO 180 measurement method and IZOD impact strength test.

(4) Measurement of thickness of functional particles

A disk micrometer (Mitutoyo, 369-250) is used to measure the thickness of the functional carbon fiber fabric. And the thickness of the functional particles is calculated by subtracting the thickness of the standard fabric from the measured thickness of the functional carbon fiber fabric. Here, the standard fabric thickness means the total thickness of the functional carbon fiber fabric minus the thickness of the functional particles.

However, if the thickness of the functional particles is 5㎛ or less, it is measured by an indirect method.

<Indirect method-5㎛ or less>

When processing functional particles through the binder processing machine (W2000), a slide glass of 120 x 40 mm is placed on the top of the fabric, and after processing the functional particles, half of the functional particles are removed from the center. After that, the step was measured using a step measuring device Surfcom (1500SD3, TOKYO SEIMITSU) to check the thickness value.

(5) Measurement of particle adhesion

A sample is prepared by cutting the functional carbon fiber fabric finished with the functional particle treatment into 500mm X 500mm, and the total weight of the functional carbon fiber fabric is measured (Wa). The sample is wound around a cylinder having a diameter of 200 mm, and then the total weight of the functional carbon fiber fabric is measured (Wb). After that, the particle adhesion was calculated through Equation 1. Here, the weight of the standard fabric means the weight obtained by subtracting the weight of the functional particles from the total weight of the functional carbon fiber fabric.

Table 1 shows the experimental results measured according to Experimental Examples 1 to 5 for Examples 1 to 6 and Comparative Examples 1 to 10. However, the flexural strength, flexural modulus, and impact strength in Table 1 are the values measured in Comparative Example 1 as 100, and then the values measured in each Example and Comparative Example are converted into a ratio.

Flexural strength
(ratio) Flexural modulus
(ratio) Impact strength
(ratio) Of functional particles
thickness Particle adhesion
(%) Comparative Example 1 100 100 100 - - Example 1 101 100 110 105㎛ 85 Example 2 100 105 110 600㎛ 80 Example 3 110 100 120 13㎛ 98 Example 4 105 105 105 5nm 100 Example 5 110 120 120 10nm 100 Example 6 105 110 110 20nm 100 Comparative Example 2 100 100 100 105㎛ 70 Comparative Example 3 90 105 110 105㎛ 100 Comparative Example 4 100 100 100 5nm 100 Comparative Example 5 95 100 90 30㎛ 70 Comparative Example 6 85 100 80 105㎛ 70 Comparative Example 7 100 100 100 2nm 100 Comparative Example 8 80 90 75 650㎛ 50 Comparative Example 9 100 100 100 5nm 100 Comparative Example 10 75 90 60 600㎛ 40

Looking at Table 1, Examples 5 and 6 used functional particles of CNTs having a diameter of 5 nm and a length of 10 um, and Comparative Example 5 used a glass fiber chop having a diameter of 13 um and a length of 25.4 mm, and functional particles were used. When used as a fibrous particle, overlapping occurred between the fibrous functional particles, and the thickness was larger than the diameter of the functional particles.

It can be seen that the flexural strength of Examples 1 to 6 according to the present invention is equal to or superior to Comparative Example 1 in which the functional particles are not applied to the carbon fiber fabric, and it can be seen that it has the highest flexural strength in Examples 3 and 5. have. In particular, it can be seen that the flexural modulus is the highest in Example 5 using CNT, and it can be seen that the impact strength is excellent in all Examples.

Unlike Examples 1 to 6, it can be seen that Comparative Examples 2 to 10 have the following problems.

First, it can be seen that Comparative Example 2 lacking the binder powder has low particle adhesion and little change in physical properties compared to Comparative Example 1.

In addition, Comparative Example 3 in which the binder powder was excessive shows a result of decreasing the flexural strength compared to the Examples.

In addition, it can be seen that Comparative Example 4 lacking functional particles had little change in physical properties compared to Comparative Example 1.

In addition, Comparative Example 5 in which the functional particles were excessive showed a result of decreasing the flexural strength and impact strength compared to Examples 1 to 6. In this way, when the functional particles do not satisfy 0.1 to 20 parts by weight relative to 100 parts by weight of the carbon fiber fabric, the effect of enhancing the performance by the functional particles may be insufficient, or physical properties may be deteriorated.

In addition, Comparative Example 6, in which both the functional particles and the binder powder were excessive, also showed a decrease in flexural strength and impact strength compared to Examples 1 to 6, similar to Comparative Example 5.

In addition, in Comparative Example 7 in which the diameter of the functional particles is 2 nm and less than 3 nm, it can be seen that the functional particles are scattered according to the flow of air during the scattering process, making it difficult to adhere to the carbon fiber fabric, resulting in a problem that the physical properties do not increase. This problem of Comparative Example 7 makes manufacturing difficult by affecting the process process.

In addition, Comparative Example 8, in which the diameter of the functional particles was 650 μm and exceeded 600 μm, showed a problem in that physical properties were reduced due to non-uniform particle distribution because the functional particles were easily detached by physical force even if the functional particles were attached to the carbon fiber fabric. I can.

In addition, Comparative Example 9, in which the thickness of the functional particles was measured to be 5 nm, had a thickness ratio of 0.000004:1 and less than 0.000005:1 with the carbon fiber fabric, so that the effect of increasing the performance by the functional particles was insufficient, and thus physical properties did not increase. You can see that it appeared. In addition, in Comparative Example 10, in which the thickness of the functional particles was measured to be 600㎛, since the thickness ratio with the carbon fiber fabric was 1.1:1, which exceeded 1:1, the physical properties were deteriorated and dropping occurred during the handling process of the carbon fiber fabric. It can be seen that the adhesive force of the particles is low, and the problem of reducing the physical properties due to the uneven particle distribution appeared.

As described above, the functional carbon fiber fabric and the carbon fiber composite material using the same according to an embodiment of the present invention include functional particles in powder form, thereby increasing physical properties and using it as a filler to reduce cost, improve appearance gloss, and product It makes it possible to impart various functions such as reducing the thermal strain of

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention defined in the following claims are also present. It belongs to the scope of rights of

Claims (17)

Functional particles applied to at least one side of the carbon fiber fabric are fixed by fusion of the binder powder by heat,
The thickness ratio of the functional particles and the carbon fiber fabric is 0.000005:1 to 1:1,
A functional carbon fiber fabric comprising 0.5 to 20 parts by weight of the binder powder and 0.1 to 20 parts by weight of the functional particles relative to 100 parts by weight of the carbon fiber fabric. The method of claim 1,
The binder powder is any one of a bisphenol A-based or bisphenol-based composition, functional carbon fiber fabric. The method of claim 1,
The average particle diameter (d50) of the functional particles is 3nm to 600㎛, functional carbon fiber fabric. The method of claim 1,
When the functional particles are fibrous, the diameter is 3nm to 50㎛, the length is 20㎛ to 25.4mm, functional carbon fiber fabric. The method of claim 1,
The functional particles are formed on the carbon fiber fabric with a thickness of 3nm to 600㎛, functional carbon fiber fabric. delete delete The method of claim 1,
The functional particles are silica, diatomaceous earth, alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, lead oxide, antimony oxide, ferrite, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, basic magnesium carbonate, calcium carbonate, magnesium carbonate, Zinc carbonate, barium carbonate, dosonite, hydrotalcite, calcium sulfate, gypsum, barium sulfate, gypsum fiber, calcium silicate, talc, sepiolite, clay, mica, montmorillonite, bentonite, activated clay, imogolite, sericite, glass Fiber, glass beads, glass bubble, silica-based balun, aluminum nitride, silicon nitride, boron nitride, carbon black, graphite, carbon fiber, carbon balun, charcoal powder, CNT, potassium titanate, MOS, lead zirconate titanate, silicon carbide, stainless fiber , Zinc borate, slag fiber, Teflon powder, wood powder, pulp, rubber powder, aramid fiber, and a functional carbon fiber fabric comprising one or more particles selected from metal particles. The method of claim 1,
The melting point of the binder powder is 50 to 150 ℃, functional carbon fiber fabric. The method of claim 9,
The melting point of the functional particles is at least 10 ℃ higher than the melting point of the binder powder, functional carbon fiber fabric. The method of claim 1,
The number of strands of fibers constituting the carbon fiber fabric is 3,000 to 50,000, and the weight per unit area is 100 to 600 g/m ² , functional carbon fiber fabric. The method of claim 1,
The carbon fiber fabric is any one of plain weave, twill weave, runner weave and NCF, UD fabric, functional carbon fiber fabric. The method of claim 1,
The carbon fiber fabric is a functional carbon fiber fabric having an area ratio of 75% or more occupied by the carbon fiber on the cotton. Carbon using a functional carbon fiber fabric manufactured through the RTM molding method in which the functional carbon fiber fabric according to any one of claims 1 to 5 and 8 to 13 is placed in an RTM molding mold and a matrix resin is injected. Fiber composite material. The method of claim 14,
The matrix resin is a carbon fiber composite material using a functional carbon fiber fabric comprising any one resin selected from an epoxy resin, a polyester resin, a vinyl ester resin and a polyphenol resin. In the method for manufacturing a functional carbon fiber fabric according to any one of claims 1 to 5 and 8 to 13,
A first step of spraying a binder powder on the surface of the carbon fiber fabric unwound at a predetermined speed using a scatter;
A second step of spraying functional particles using a scatter on the carbon fiber fabric sprayed with the binder powder; And
A third step of fixing the functional particles on the surface of the carbon fiber fabric by heat treating the carbon fiber fabric sprayed with the binder powder and the functional particles;
Containing, a method for producing a functional carbon fiber fabric. The method of claim 16,
The first step and the second step,
Filling the binder powder or the functional particles in the fine grooves formed on the surface of the scatter roll, and uniformly spraying the binder powder or functional particles on the carbon fiber fabric by shaking off the binder powder or functional particles filled in the fine grooves , Method for producing a functional carbon fiber fabric.

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