KR20220154939A - Carbon fiber fabric and method of manufacturing the same - Google Patents

Abstract

According to the present invention, a carbon fiber fabric is made by crossing warp and weft yarns formed of carbon fibers in which a fixing portion made of carbon fibers impregnated with an adhesive resin on at least one of the outermost sides is fused to the warp and weft yarns to fix a fabric. According to the carbon fiber fabric, unlike conventional fixing yarns such as nylon, both ends of the weft yarns are fixed, so it is easy to handle and transport. Even if gaps in the fabric are created by the outside, a space can be corrected to be used, and even disorganization of the fabric can be prevented. In addition, even a fixed part can be used in product manufacturing to reduce loss and prevent fiber strands which make up the fabric from falling out. Moreover, problems such as weight change and deterioration of physical properties due to fiber loss can also be prevented.

Description

Carbon fiber fabric and its manufacturing method {CARBON FIBER FABRIC AND METHOD OF MANUFACTURING THE SAME}

The present invention relates to a carbon fiber fabric used in a carbon fiber composite material, and more particularly, to a carbon fiber fabric that fixes a carbon fiber strand located at the outermost part of the carbon fiber fabric without using a fixing yarn and a manufacturing method thereof will be.

Fiber-reinforced composite materials such as fiber-reinforced plastics are prepared by impregnating fibers with a matrix resin. Fiber-reinforced composites have excellent mechanical properties and corrosion resistance of plastics, so they are widely used as high-performance and high-functional materials. As such a fiber-reinforced composite material, a glass fiber composite material reinforced with glass fiber and a carbon fiber composite material reinforced with carbon fiber are widely used. In particular, the carbon fiber composite material is used in various industrial fields due to its excellent light weight and strength. As described above, carbon fiber composite materials can achieve high mechanical strength and light weight at the same time, so they are widely used in objects such as aircraft, automobiles, and leisure products, and the number of objects for use is gradually increasing.

In addition, as is generally known, methods such as press molding, autoclave, injection molding, and filament winding molding are used as molding methods for carbon fiber composite materials. Among them, a method of molding a carbon fiber composite material using a RTM (Resin Transfer Molding) method during press molding is widely used in consideration of molding time and equipment cost. In particular, the RTM method is commonly used when producing high-quality exterior parts.

In this RTM method, a carbon fiber composite material is manufactured by inserting carbon fiber fabric into a mold of a press, closing the mold, and then injecting a matrix resin. In this process, when the carbon fiber fabric is put into the mold, at least two carbon fiber fabrics are overlapped with several plies as needed. However, when the carbon fiber fabrics are laminated individually, the mass productivity of the product is lowered due to the large time consumption because the laminates must be individually laminated. In addition, when the carbon fiber substrates are laminated one by one ply, the carbon fiber strands composed of warp and weft yarns are separated from the carbon fiber fabric, and there is a problem that carbon fibers or other materials may be mixed between each layer. have.

In order to solve this problem, a preform in which carbon fiber fabrics are laminated is prepared and used in advance. When making a preform using carbon fiber fabric, the carbon fiber fabric is cut. During cutting, it is easy to see the phenomenon that the carbon fiber strands in the edge portion are separated. When the number of separated strands increases, the fabric of the cut 1 ply becomes unusable, resulting in loss, and it is not easy to achieve physical properties such as weight of the product to be molded. In addition, there is a problem that frequently occurs when one ply of the carbon fiber fabric cut by external pressing or stamping must be discarded during transportation.

As such, a method of fixing the outer portion of the carbon fiber fabric using a separate fixing thread has been used as a way to solve the problem of the carbon fiber strand being separated when cutting the carbon fiber fabric. A thermoplastic fiber such as nylon is generally used as the fixing yarn, and a separate fixing yarn is additionally used to weave the fibers to fix the carbon fiber fabric to prevent dislocation or separation. As described above, since the fixing method using the nylon fixing thread is physically woven, the fixing force is lowered and the fibers are easily separated, and the nylon fixing thread cannot be used in a fixed position, resulting in loss of the carbon fiber fabric. In addition, there is a method to prevent fibers from separating even through preform production, but there is a limit to preventing fiber separation before preform production. In order to prevent the separation of fibers, the problem of deterioration of workability and work efficiency continues.

Republic of Korea Patent No. 10-2046397

The present invention has been made to meet the above needs and solve the conventional problems, and an object of the present invention is to provide a carbon fiber fabric capable of preventing separation and disorganization of carbon fiber strands and a manufacturing method thereof.

In addition, another object of the present invention is to provide a carbon fiber fabric and a method for manufacturing the same, which increase the efficiency of use by eliminating the loss of the carbon fiber fabric caused by the use of fixed yarns.

In addition, another object of the present invention is to provide a carbon fiber fabric and a manufacturing method thereof capable of reducing production costs, improving workability and efficiency, preventing contamination of foreign substances, and reducing product defects.

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

The above object is a carbon fiber fabric formed by crossing warp and weft yarns formed of carbon fiber, and a fixing unit made of carbon fiber impregnated with an adhesive resin located in place of the warp or weft located on at least one side of the outermost side is the warp and weft yarns. This is achieved by a carbon fiber fabric that is fused to the weft to hold the fabric in place.

Preferably, the fixing part may include 10 to 25 parts by weight of the adhesive resin based on 100 parts by weight of the carbon fiber.

Preferably, the adhesive resin may include an epoxy resin or a polyamide resin.

Preferably, the tensile strength of the carbon fiber fabric may be 10 to 30 MPa.

Preferably, the carbon fiber fabric has a porosity measured after fixing the edge of the carbon fiber fabric and dropping a predetermined weight, fixing one side and pulling the other side with a force of 300 to 500 gf to correct the carbon fiber fabric. It may be 3 to 8%.

Preferably, the gas permeability of the carbon fiber fabric may be 75 to 85 cc/cm ² ·s.

Preferably, the adhesive force between the fixing part and the weft or warp may be 50 to 200 gf/inch.

Preferably, the carbon fiber fabric may be one using 3K, 12K and UD, and the carbon fiber fabric may be composed of a plain weave or twill weave.

In addition, the above object is to form a fixing part by impregnating the adhesive resin into the carbon fiber, dividing the carbon fiber into weft and warp yarns and interlacing the weft and warp yarns to manufacture a fabric, at least one side of the outermost side of the fabric It is achieved by a method for manufacturing a carbon fiber fabric comprising the step of fixing the fixing part by crossing the weft or warp yarn and pressing and heating the adhesive resin of the fixing part to the warp or weft yarn.

The carbon fiber fabric and its manufacturing method according to the present invention are easy to handle and transport because both ends (outermost part) of the warp and/or weft yarns are fixed, unlike the configuration using a fixed yarn such as nylon, which has been conventionally used. In addition, even if voids in the fabric are created by the outside, it can be used by correcting the gap, and there is an effect such as preventing the fabric from being disturbed.

In addition, the carbon fiber fabric and method for manufacturing the same according to the present invention can be used in product manufacturing up to the fixed portion, reducing loss and preventing the fiber strands constituting the fabric from falling out, and weight change due to the falling out of the fiber And there is an effect such as being able to prevent the problem of deterioration of physical properties.

In addition, the carbon fiber fabric and method for manufacturing the same according to the present invention can minimize the use of a binder, and since there is no nylon fixing thread used previously, the fabric can be used as it is.

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 description below.

1 is a configuration diagram of a carbon fiber fabric according to an embodiment of the present invention.
FIG. 2 is a view explaining defects due to generation of voids between a carbon fiber fabric according to an embodiment of the present invention and a carbon fiber fabric using a conventional fixing yarn.
3 is a view explaining the difference between a carbon fiber fabric according to an embodiment of the present invention and a carbon fiber fabric using a conventional fixing yarn.
4 is a flowchart showing a method for manufacturing a carbon fiber fabric according to an embodiment of the present invention.

With reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In the drawings, the thickness is shown enlarged to clearly express the various layers and regions. Like reference numerals have been assigned to like parts throughout the specification. When a part such as a layer, film, region, plate, etc. is said to be “on” another part, this includes not only the case where it is “directly on” the other part, but also the case where there is another part in between. Conversely, when a part is said to be "directly on" another part, it means that there is no other part in between.

Unless defined otherwise, 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.

1 is a configuration diagram of a carbon fiber fabric according to an embodiment of the present invention.

Referring to FIG. 1, a carbon fiber fabric 100 according to an embodiment of the present invention is a carbon fiber fabric formed by crossing warp yarns 110 and weft yarns 120 formed of carbon fibers, and at least one side of the outermost side. A fixing part 130 made of carbon fiber impregnated with an adhesive resin is fused to fix the warp yarn 110 and the weft yarn 120. The warp yarns 110 and the weft yarns 120 made of carbon fiber cross each other to form a fabric, and the fixing part 130 may be positioned instead of at least one warp yarn or weft yarn located at the outermost part. The outermost fixing part 130 fixes the shape of the carbon fiber fabric 100 by being fused and fixed to the adjacent warp yarns 110 and weft yarns 120 through an adhesive resin.

In the example of FIG. 1 , a pair of fixing parts 130 are positioned instead of the warps located at both left and right ends of the carbon fiber fabric 100 . However, the configuration of the fixing part of FIG. 1 is only for convenience of description and is not limited thereto, and the position and number of the fixing part 130 can be freely adjusted as needed.

In one embodiment, the adhesive resin included in the fixing part 130 preferably includes an epoxy resin or a polyamide resin. However, the adhesive resin is not limited to epoxy resin and polyamide resin, and various adhesive resins may be used depending on the use and purpose of the carbon fiber fabric.

In addition, the carbon fibers constituting the fixing part 130 are preferably the same as the carbon fibers constituting the warp yarns 110 and the weft yarns 120. When the carbon fibers constituting the fixing part 130 are the same as the carbon fibers constituting the warp yarn 110 and the weft yarn 120, there is no difference in the total carbon fibers constituting the carbon fiber fabric 100, so that the fixing part 130 and The carbon fiber fabric 100 may be used without distinguishing between the warp yarn 110 and the weft yarn 120. On the other hand, since the conventional fixed yarn uses synthetic fibers such as nylon, there is a problem in that the fixed yarn must be separately removed during the process or the carbon fiber fabric in the portion where the fixed yarn is located must be excluded.

In one embodiment, the fixing part 130 preferably includes 10 to 25 parts by weight of an adhesive resin based on 100 parts by weight of carbon fiber. If the adhesive resin of the fixing part 130 is less than 10 parts by weight, the adhesive strength to the warp yarn 110 and / or the weft yarn 120 is insufficient, resulting in insufficient fixing force to the carbon fiber fabric 100, and exceeding 25 parts by weight In this case, the drape property deteriorates and becomes stiff.

In one embodiment, the adhesive force between the fixing part 130 and the warp yarn 110 or the weft yarn 120 is preferably 50 to 200 gf / inch. If the adhesive strength is less than 50 gf / inch, the adhesion to the carbon fiber fabric 100 is insufficient due to insufficient adhesive strength, and if it exceeds 200 gf / inch, the drapability of the fabric is poor, resulting in a problem that it is impossible to wind it in a roll form.

The carbon fiber fabric according to an embodiment of the present invention has the same basic shape as the woven carbon fiber fabric, but the fixing part 130 is provided at the outermost ends of the warp yarns 110 and/or the weft yarns 120. It is fused by adhesive resin and has a fixed shape. In general, carbon fiber fabrics are mostly manufactured using an RTM process or an infusion process, and in this case, carbon fiber strands are woven and used in a preform form. However, if one strand of the carbon fiber fabric is separated or the fixing thread is missing, workability may deteriorate and an error may occur between the weight of the product and the target thickness. In addition, when the carbon fiber strands are separated, defects due to aggregation of the resin occur in the part where the fibers are separated during the molding process, resulting in defective products. Occurs. On the other hand, in the carbon fiber fabric according to an embodiment of the present invention, the warp yarns 110 and the weft yarns 120 are fixed by the fixing part 130, so that the carbon fiber strands do not separate, and a separate fixing yarn Since there is no fixing thread, the entire carbon fiber fabric 100 can be used in the process without the need to remove the fixing thread or exclude the carbon fiber fabric in the portion where the fixing thread is located.

The carbon fiber fabric 100 according to an embodiment of the present invention is modified manually after applying an unspecified force to create voids. In the form tied with fixing yarn, it is difficult to modify because the fibers are individual, but in the present invention, it is easy to modify because both ends are fixed with resin, and the porosity is preferably 3 to 8%. More specifically, after fixing the edge of the carbon fiber fabric 100, a 5 kg weight is dropped from a height of 50 cm to be disturbed, and the porosity measured after correcting the disturbance is preferably 3 to 8%. At this time, correcting the disorder of the carbon fiber fabric 100 is to place the disordered carbon fiber fabric 100 on a table, fix one side with a clamp, etc., and use a moving system and a load cell to pull the fabric from the other side facing each other. The voids of the carbon fiber fabric are corrected by pulling the carbon fiber fabric 100 with a force of 300 to 500 gf, and the finally measured porosity is preferably 3 to 8%. If the porosity is less than 3%, there is difficulty in injecting resin in the future RTM process, and if it is more than 8%, there is a problem in that the appearance and physical properties are deteriorated due to the empty part when manufacturing a molded product.

In one embodiment, the carbon fiber fabric 100 preferably has a tensile strength of 10 to 30 MPa. If the tensile strength of the carbon fiber fabric 100 is less than 10 Mpa, a problem of the carbon fiber fabric being broken or connected fibers being separated individually occurs, and if the tensile strength is greater than 30 MPa, the drapability of the fabric is poor.

In one embodiment, the carbon fiber fabric 100 preferably has a gas permeability of 75 to 85 cc/cm ² ·s. If the gas permeability of the carbon fiber fabric (100) is less than 75 cc/cm ² ·s, the fibers are excessively densely arranged, making it difficult to inject resin in the future, and if it exceeds 85 cc/cm ² ·s, the porosity is large Therefore, problems such as the above-mentioned appearance or physical properties may be caused. In one embodiment, the configuration of the carbon fiber fabric 100 may use 3K, 12K, and UD, and may be applied to fabrics composed of plain weave and twill weave.

FIG. 2 is a view explaining defects due to generation of voids between a carbon fiber fabric according to an embodiment of the present invention and a carbon fiber fabric using a conventional fixing yarn.

Referring to FIG. 2, a conventional carbon fiber fabric 201 using a fixing yarn is woven with a fixing yarn made of a material such as nylon, but the carbon fiber strands are easily separated from the fixing yarn. When the carbon fiber strands are separated, air pockets in the missing strands cause aggregation of the resin, which becomes a defect in the appearance and causes product defects. When the carbon fiber strands are separated in this way, the thickness of the molded article is not constant, resulting in deviations and making it impossible to secure stable physical properties. In addition, since fiber separation of the substrate during the transfer process occurs before the preform is produced, the fabric must be recut, so the amount of work is increased, and even if the separated fibers are placed on the fabric, a poor final molded product is produced. It becomes a problem.

In addition, a lot of binders are used in the production of preforms. For the physical properties of molded products, it is better to minimize the amount of binders used, but more defects occur due to movement when stacked in multiple sheets. Binders are used to prevent movement. Excessive use of binders, however, can be a drawback.

On the other hand, in the carbon fiber fabric 202 according to an embodiment of the present invention, since a fixing part made of carbon fiber impregnated with an adhesive resin is fused to fix the warp and weft threads on at least one side of the outermost side, the use of binders is minimized. can do. As described above, since the carbon fiber fabric 202 according to an embodiment of the present invention does not have a fixing yarn, there is an advantage in that the fabric can be used as it is. In addition, since the carbon fiber fabric 202 according to an embodiment of the present invention uses a fabric with both ends fixed, the separation of the carbon fiber strands does not occur, and the agglomeration of the resin does not occur, so that product defects do not occur. .

3 is a view explaining the difference between a carbon fiber fabric according to an embodiment of the present invention and a carbon fiber fabric using a conventional fixing yarn.

Referring to FIG. 3 , the carbon fiber fabric 410 using a conventional fixing yarn is fixed by weaving a fixing yarn such as nylon to a carbon fiber strand. However, when an external force is applied to the carbon fiber fabric due to transportation, transport, manufacturing process, or being caught somewhere else, some deformation such as disheveling occurs. At this time, since the fixing yarn does not strongly fix the carbon fiber strands, the carbon fiber fabric 410 using the conventional fixing yarn has a problem in that the detached carbon fiber strands 411 are easily generated. When the detached carbon fiber strands 411 occur, as described in FIG. 2 above, aggregation problems due to air pockets occur, so a process for correcting them is additionally required. In general, the method of correcting the disorganized carbon fiber fabric is to hold both ends, apply force to the left and right, and twist it up and down to correct the warp and weft yarn gaps. However, the carbon fiber fabric 410 using the conventional fixing yarn has a problem in that it is difficult to correct to its original state due to separation of the carbon fiber strands.

On the other hand, in the carbon fiber fabric 420 according to an embodiment of the present invention, both ends are fixed by fixing parts, and an adhesive resin is applied to the carbon fiber strands constituting the fabric instead of using a separate fixing thread. Since it is impregnated to fix the carbon fiber fabric 420, the entire material can be used for the molded article, so there is little loss of the base material. In addition, the carbon fiber fabric 420 according to an embodiment of the present invention also has the advantage that several sheets can be simply attached using a heat gun and a dryer to apply heat even when making a preform. In particular, the greatest advantage of the present invention is that the outermost end is fixed by the fixing part when the fabric is disturbed due to being caught somewhere else during transportation, transfer, lamination, manufacturing process, and operator's handling, so that the carbon fiber strand is The escape can be minimized. In addition, it is possible to reduce the gap between the warp and weft yarn by holding both ends, applying force to the left and right, and twisting up and down to correct the disorganized part, and the gas permeability can be adjusted to a state similar to the first one by correcting the disorganized gap.

As described above, the carbon fiber fabric according to one embodiment of the present invention is fixed by the fixing portion to the carbon fiber strands constituting the warp and weft yarns, and even if the porosity increases due to the external force applied to the fabric, it is not disturbed by the fixed portion. It can restore more than 90% to its original state without losing, and it is possible to prevent loss of parts that cannot be reused due to disturbance. In addition, the part where the fixing part is located can also be used as an actual molding base material, thereby increasing the economic effect.

A carbon fiber fabric according to an embodiment of the present invention includes a unwinding unit for supplying carbon fiber, a weaving unit for forming warp and weft yarns, a fixing unit for impregnating and cooling an outermost side of an adhesive resin, and manufactured carbon fiber. Manufactured through a winding unit that winds the fabric. The carbon fiber strands supplied from the unwinding unit form a carbon fiber fabric by weaving the warp and weft yarns in the weaving unit, respectively. In addition, the carbon fiber fabric is fixed by interlacing the warp and weft with the fixing part impregnated with the adhesive resin on at least one outermost side of the carbon fiber fabric formed by weaving the warp and weft. Next, the fixing part is formed and the fixed carbon fiber fabric is wound through the winding part.

4 is a flowchart showing a method for manufacturing a carbon fiber fabric according to an embodiment of the present invention. Referring to FIG. 4, in the method of manufacturing a carbon fiber fabric according to an embodiment of the present invention, the carbon fiber is impregnated with an adhesive resin to form a fixing part (S401), the carbon fiber is divided into weft and warp, and the weft and warp are separated. manufacturing a fabric by weaving (S402), fixing a fixing part to at least one side of the outermost side of the fabric by crossing it with the weft or warp yarn (S403), and compressing and heating the adhesive resin of the fixing part to the warp or weft. A fusing step (S404) is included.

First, in the step of impregnating the carbon fiber with the adhesive resin to form a fixing part (S401), the carbon fiber strand is impregnated with the adhesive resin and then cooled to form the fixing part. The carbon fiber strands used in the fixing part are preferably the same as the carbon fiber strands forming the weft and warp yarns of the carbon fiber fabric in consideration of the uniform physical properties of the product to be molded. At this time, the fixing part is impregnated with 10 to 25 parts by weight of the adhesive resin in 100 parts by weight of the carbon fiber. In addition, the adhesive resin used at this time is preferably an epoxy resin or a polyamide resin.

Next, in step S402 of dividing the carbon fibers into wefts and warps and interweaving the wefts and warps to produce a fabric, the carbon fiber strands are divided into wefts and warps, respectively, and interwoven with each other to form a fabric. At this time, it is preferable that the form of weaving is a form of plain weave and twill weave.

Next, in the step (S403) of fixing the fixing part to at least one side of the outermost side of the fabric by crossing the weft or warp yarn, the fixing part formed in step S401 is located at the outermost warp or weft position of the fabric manufactured in step S402. After placing it on one side, the warp and weft yarns constituting the carbon fiber fabric are crossed at the fixing portion to fix the fixing portion to the carbon fiber fabric.

Next, in the step of pressing and heating the adhesive resin of the fixing part to the warp or weft yarn (S404), heat and pressure are applied to the fixing part so that the fixing part is adhered to the warp and weft of the fabric by the adhesive resin constituting the fixing part. . In this way, since the fixing part is adhered and fixed to the warp and weft yarns at the outermost position of the carbon fiber fabric, the carbon fiber fabric according to an embodiment of the present invention prevents the carbon fiber strand from leaving, and prevents it from being disturbed due to external force. It can be modified with minimal effort, and since no fixing yarn is used, the entire carbon fiber fabric can be used for molding, eliminating loss.

Hereinafter, the present invention will be described in more detail through examples. This embodiment is intended to explain the present description in more detail, and the scope of the present invention is not limited to the embodiment.

[Example]

[Example 1]

A fixing part is formed by impregnating 10 parts by weight of an epoxy resin (Kumho P&B Chemicals, KER834) with respect to 100 parts by weight of a carbon fiber strand having a thickness of 500 μm and a weight of 315 g/m ² . In addition, after weaving the same carbon fiber strand as the fixing part in a plain weave form to manufacture a fabric, warp yarns located at both left and right ends of the fabric are replaced with the fixing part, and then intersected with the weft and warp yarns constituting the fabric and fixed. Next, heat and pressure of 150° C. and 0.5 MPa were applied for about 5 minutes to fuse the fixing part to the warp and weft yarns to prepare a carbon fiber fabric.

[Example 2]

A carbon fiber fabric was prepared in the same manner as in Example 1, except that 25 parts by weight of the epoxy resin was impregnated into the fixing part.

[Comparative Example]

[Comparative Example 1]

A carbon fiber fabric was manufactured in the same manner as in Example 1, except that the fixed yarn was fixed using a nylon fixing thread to the ready-made carbon fiber fabric instead of using a fixing part.

[Comparative Example 2]

A carbon fiber fabric was prepared in the same manner as in Example 1, except that the fixing part was impregnated with 9 parts by weight of an epoxy resin.

[Comparative Example 3]

A carbon fiber fabric was prepared in the same manner as in Example 1, except that 26 parts by weight of the epoxy resin was impregnated into the fixing part.

For the fabrics prepared in Examples 1 and 2 and Comparative Examples 1 to 3, the physical properties were evaluated through the following experimental examples, and the results are shown in Table 1.

[Experimental example]

(1) Tensile strength

For the tensile test, an Instron Model 5985 UTM was used, and a load cell with a maximum load of 100 tons was used. During the tensile test, the cross head speed was maintained constant at 1 mm/min.

(2) Adhesion

The peel force at the time of peeling at 180 ° was measured using the AR-1000 equipment of Cheminstrument. At this time, the peeling rate was 0.3 mpm, and the measurement unit was gf/in.

(3) Porosity

The initial porosity before fiber separation was measured for the carbon fiber fabrics of Examples and Comparative Examples using VERTEX 311HC equipment. After fixing the four corners of the carbon fiber fabric with a simple jig, a 5 kg weight was dropped from a height of 50 cm to increase the air gap, and then the disorganized porosity was measured. After that, the disorganized fabric was placed on a table and one side was The porosity was measured after fixing with a clamp and correcting the voids of the fabric by pulling with a force of 400 gf using a load cell and a moving system that pulls the fabric from the opposite side.

(4) Gas permeability

Using a gas permeability device (KAEI KAGAKU SEIKI Co., Ltd.), the initial gas permeability before fiber separation in the experimental example was measured for the carbon fiber fabrics of Examples and Comparative Examples. In addition, the disorganized gas permeability was measured after being disturbed in the same manner as in the porosity of Comparative Example 3, and the gas permeability was measured after correcting the fabric.

Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Tensile strength (MPa) 10 30 not measurable not measurable 45 Adhesion (gf/inch) 30 200 not measurable not measurable not measurable fiber breakaway X X ○ ○ ○ Initial porosity (%) 4 5 5 5 4.5 Disorganized porosity (%) 20 22 18 19 18.5 Porosity after correction (%) 4 5.5 14 10 5.5 porosity difference 16 16.5 4 9 13 Early
Gas permeability (%) 75 78 82 81 77 disheveled
Gas permeability (%) 120 130 118 125 133 Gas permeability after fertilization (%) 78 79 100 92 81 gas permeability
rate of change 42 51 18 33 52

Examples 1 and 2 according to an embodiment of the present invention satisfied the tensile strength and adhesive strength defined in the present invention, did not cause fiber breakaway, and arbitrarily increased the porosity, so that both the porosity change rate and the gas permeability change rate before and after modification were of the present invention. It can be seen that the configuration is satisfied, and recovery is possible to a level almost similar to the original state before being disturbed. Comparative Example 2 was easier to correct the voids than Comparative Example 1, but was easily separated, and in the case of Comparative Example 3, measurement was impossible because the adhesive strength by the resin was excellent and exceeded the measurement limit.

On the other hand, Comparative Example 1 using nylon fixing yarns was manufactured by weaving nylon fixing yarns, so the tensile strength and adhesive strength could not be measured, and fiber separation occurred easily, and the porosity change rate and gas permeability change rate before and after correction were Beyond the configuration of the invention, it can be seen that not only fiber separation occurs easily, but also that the initial state is not restored even if the generated fiber separation is corrected.

In addition, in Comparative Example 2, in which the content of the adhesive resin is insufficient, the fibers are easily separated, resulting in fiber separation, and the porosity after modification and the gas permeability after modification do not satisfy the configuration of the present invention, and thus the tensile strength and adhesive strength cannot be measured. It can be seen that there is no

In addition, it can be seen that the fabric according to Comparative Example 3 having an excessive amount of adhesive resin was not easy to handle due to the excessive amount of resin at both ends, and the adhesiveness could not be measured. will cause problems

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 of those skilled in the art using the basic concept of the present invention defined in the following claims are also made according to the present invention. falls within the scope of the rights of

100: carbon fiber fabric
110: slope
120: weft
130: fixing part
410: carbon fiber fabric using fixed yarn
411: detached carbon fiber strand
420: carbon fiber fabric

Claims (10)

As a carbon fiber fabric formed by crossing warp and weft yarns formed of carbon fiber,
A carbon fiber fabric, wherein a fixing portion made of carbon fiber impregnated with an adhesive resin on at least one outermost side is fused to the warp and weft to fix the fabric. According to claim 1,
The fixing part comprises 10 to 25 parts by weight of the adhesive resin based on 100 parts by weight of carbon fiber, carbon fiber fabric. According to claim 1,
The adhesive resin comprises an epoxy resin or a polyamide resin, carbon fiber fabric. According to claim 1,
Tensile strength of the carbon fiber fabric is 10 to 30MPa, carbon fiber fabric. According to claim 1,
The carbon fiber fabric has a porosity measured after fixing the edge of the carbon fiber fabric and dropping a predetermined weight, fixing one side and pulling the other side with a force of 300 to 500 gf to correct the carbon fiber fabric. 8% carbon fiber fabric. According to claim 1,
The gas permeability of the carbon fiber fabric is 75 to 85 cc / cm ² s, the carbon fiber fabric. According to claim 1,
The adhesive strength of the fixing part and the weft or warp yarn is 50 to 200 gf / inch, carbon fiber fabric. According to claim 1,
The carbon fiber fabric is a carbon fiber fabric using 3K, 12K and UD. According to claim 1,
The carbon fiber fabric is composed of a plain weave or twill weave, carbon fiber fabric. Forming a fixing part by impregnating the carbon fiber with an adhesive resin;
Separating the carbon fibers into wefts and warps and interweaving the wefts and warps to produce a fabric;
fixing the fixing part to at least one side of the outermost side of the fabric by crossing the weft or warp yarn; and
fusing the adhesive resin of the fixing part to the warp or weft by pressing and heating;
A method for producing a carbon fiber fabric comprising a.

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