TWI616324B - Soft carbon fiber composite with three-dimensional surface textures and method for manufacturing the same - Google Patents

Abstract

The present invention relates to a soft carbon fiber composite material and a method of manufacturing the same, wherein the composite material comprises a carbon fiber fabric having a three-dimensional grain surface and a thermoplastic resin infiltrated into the interior of the carbon fiber fabric. The method comprises providing a thermoplastic resin and heating and melting the same; providing a carbon fiber fabric having a three-dimensional texture on at least one surface, and coating the molten thermoplastic resin on at least a surface of the carbon fiber fabric having a three-dimensional texture; baking a carbon fiber woven fabric coated with a thermoplastic resin to allow the thermoplastic resin to penetrate into the carbon fiber woven fabric; heating and pressing the carbon fiber woven fabric coated with the thermoplastic resin with at least one soft pressing device to surface the thermoplastic resin Presenting the three-dimensional texture; and cooling the carbon fiber fabric coated with the thermoplastic resin to cure the thermoplastic resin to obtain the composite material.

Description

Soft carbon fiber composite material with three-dimensional grain surface and manufacturing method thereof

The invention relates to a soft carbon fiber composite material and a manufacturing method thereof, in particular to a soft carbon fiber composite material which has good bonding between a carbon fiber fabric and a thermoplastic resin and presents a three-dimensional texture on the surface.

Shielded electromagnetic interference (EMI) methods for electronic products are conductive coatings or metallic films or metal-plated fabrics and conductive films. In recent years, it has been found that carbon fiber itself has shielding EMI function, but carbon fiber products of traditional carbon fiber composite materials are suitable for rigid, rigid and light-weight product characteristics such as bicycles, automobiles, airplanes or specific military applications, and now carbon fiber composite materials. It can be made into a soft carbon fiber composite material, so it can be used in consumer goods such as handbags, trunks and wallets, so that the product has the function of preventing radio frequency identification and recording.

Existing soft carbon fiber composites are typically carbon fiber reinforced thermoplastic resin composites, or thermoplastic carbon fiber composites, which can be manufactured by a variety of different methods:

TW590888 provides a method for manufacturing a plastic composite material, wherein the plastic composite material comprises: a layer of adhesive medium, a plastic layer and a fabric layer, the adhesive medium layer comprising: a hot melt adhesive matrix, most impregnated in the hot melt adhesive a fiber in the matrix and two spaced surfaces, and the plastic layer is made of a plastic material, and the fabric layer is made of fiber The plastic layer and the fabric layer are respectively bonded to both surfaces of the adhesive medium layer. When the foregoing layers are bonded and pressed by heat, the hot melt adhesive matrix flows to and combines with the fabric layer and the plastic layer, so that the layers are firmly bonded.

The composite material provided by TW572825 comprises: a base fabric layer composed of a fiber material, two film layers and at least one bonding layer, wherein the base fabric layer has a first base surface and a second base surface, wherein: The film layers are all composed of thermoplastic polyurethane elastomer (TPU), and are respectively laid on the two base surfaces of the base fabric layer, the base fabric layer is treated with a diamine treating agent, and can be firmly stabilized by heating and pressing The bonding layer and the base fabric layer are bonded while forming a smooth surface.

TW410196 provides a method for preparing a fabric-patterned thermoplastic composite molded article, comprising the steps of: a) preparing a fiber-reinforced thermoplastic plastic composite sheet, wherein the thermoplastic is transparent and the fabric has a fabric texture; Cutting the composite sheet into a desired shape; c) preheating step b) cutting the composite to soften it; d) pre-heating the composite after step c) at 30 ° C ~ 150 ° C Press molding at a mold temperature; and e) cooling the preformed product of step d) to form a fabric textured thermoplastic composite molded article.

The preparation method of the various thermoplastic composite materials provided by the above patents is not limited to the fiber or the fiber woven fabric as the main layer, and then the thermoplastic film is used as the resin material or the adhesive resin is used, and the heating and pressing method is used. The fiber is impregnated with the resin and cooled to form a plastic composite having a strength and a smooth surface. However, when the thermoplastic resin is melted by heat, the viscosity is not as high as that of the thermosetting epoxy or vinyl ester, and the viscosity becomes lower than 100.0 Pa. s (1Pa.s = 1kg.m ^-1 .s ^-1 ) can flow well to the surface of the wet fiber between the fibers, so even if a composite material with a smooth appearance can be obtained, the internal fiber and resin interface cannot be good. Then, the strength, and the above patents do not detail the heating and pressing mode or the equipment used, generally refers to the use of a steel plate or mold or other hot pressing table heating and pressing. Although TW572825 indicates that the composite material provided can be applied to the sewing process and provides more processing methods, in fact, because the fiber and resin interface does not have good bonding strength, the composite material is warped or bent. A crack will appear after folding.

To address the problem of insufficient strength between the fiber and resin interfaces, the following patents provide various solutions:

TW201037123 provides a plastic composite material and a manufacturing method thereof, the method comprising the following steps: Step 1: preparing at least two fiber layers; Step 2: selecting and impregnating a binder according to material properties of each fiber layer; Step 3: arranging The fiber layer; step 4: heating and pressing the fiber layers to thermally fuse the bonding agent of at least one fiber layer, and bonding to the adjacent fiber layer as a flat material; Step 5: cooling the flat plate; Step 6: Cutting the flat sheet into at least one pre-form; step 7: heating and softening the pre-form; step 8: molding the pre-form to form a finished product, the bonding agent may be a thermosetting or thermoplastic resin.

The above step of impregnating a binder should be the main technique of the patent, but the technique and equipment used are not described in the patent. Moreover, when the thermoplastic fiber composite is heated and melted by the thermoplastic resin, the viscosity is not as high as that of the thermosetting epoxy or vinyl ester, and the viscosity may be lowered to flow between the fibers and wet the surface of the fiber to be fully impregnated. The key technologies for high-quality thermoplastic fiber composites can be obtained. Actually, there are related technical patents for mass production, such as the technique of dissolving a specific thermoplastic resin in a specific solvent to make the viscosity thinner, as disclosed in TW201442852, TW201442853 and TW200618730, but using dissolution. The law does not comply with environmental requirements, so advanced countries such as Europe and the United States prohibit or restrict use. Another mass production technique, as disclosed in US Pat. No. 5,236,972, is the impregnation of a thermoplastic resin into a very fine powder and suspended in an aqueous solution, and TW201416513 and US 5,618,367 are used to grind a thermoplastic resin into a granular form and a powder form. After the object, it is evenly sprayed or sprayed on the surface of the fiber fabric, and then heated and melted and pressurized to impregnate the fiber fabric with the thermoplastic resin. However, the thermoplastic plastic is ground to be suspendable and dispersible in water or sprayable, and then ground. The particle size of the latter particles must be very fine to near nanometer grade, so the grinding process makes the cost relatively higher, and can not meet the general general grade composite material. this.

Furthermore, the above patent does not mention that the obtained thermoplastic carbon fiber composite material has a three-dimensional grain surface, and at most only a smooth surface is obtained, so the patents do not provide how to maintain a three-dimensional grain surface on the thermoplastic carbon fiber composite material. technology.

In addition, CN 103252957 A discloses a carbon fiber outer shell having a three-dimensional texture on a surface thereof, which comprises a method of stacking a carbon fiber substrate impregnated with a thermoplastic resin into a layered structure, and then covering a surface of the outer surface of the carbon fiber layer structure with a thermoplastic film to form a composite material. Then, the composite material is placed in a hot pressing mold having a three-dimensional texture for heating and cooling, that is, a carbon fiber outer shell having a three-dimensional grain on the surface is obtained. Since the invention of this patent discloses that the carbon fiber substrate is first impregnated with a thermoplastic resin, and then additionally covered with a thermoplastic film, and then subjected to a plurality of steps such as hot pressing using a mold, there are disadvantages such as a complicated process and time consuming.

In view of the above, an object of the present invention is to provide a soft carbon fiber composite material which is capable of improving the disadvantage of poor bonding between a carbon fiber fabric and a thermoplastic resin, and exhibits a three-dimensional texture on the surface.

In order to achieve the above object, the present invention provides a soft carbon fiber composite material comprising: a carbon fiber fabric having a surface of a three-dimensional grain; and a thermoplastic resin which penetrates into the interior of the carbon fiber fabric and covers at least the three-dimensional texture of the carbon fiber fabric. The surface has a three-dimensional texture corresponding to the carbon fiber fabric.

The present invention also provides a method of manufacturing a soft carbon fiber composite material, comprising: providing a thermoplastic resin and heating and melting the same; providing a carbon fiber fabric having a three-dimensional texture on at least one surface, and coating the molten thermoplastic resin at least Having the surface of the carbon fiber fabric having a three-dimensional texture; baking a carbon fiber fabric coated with a thermoplastic resin to make the thermoplastic resin Infiltrating into the carbon fiber fabric; heating and pressurizing the carbon fiber fabric coated with the thermoplastic resin to present the three-dimensional texture on the surface of the thermoplastic resin, wherein the step of pressurizing is performed by using at least one soft pressurizing device The carbon fiber woven fabric has a three-dimensionally textured surface; and the carbon fiber woven fabric coated with the thermoplastic resin is cooled to cure the thermoplastic resin to obtain the soft carbon fiber composite material.

Preferably, the soft pressurizing device is a soft roller.

Preferably, the step of pressurizing is carried out using a combination comprising a soft pressurizing device and a hard pressurizing device.

By the method for producing a soft carbon fiber composite material provided by the present invention, the thermoplastic resin can be sufficiently and uniformly distributed inside the carbon fiber, and the bonding between the carbon fiber fabric and the thermoplastic resin is more stable, and the carbon fiber fabric is covered. The thermoplastic resin having the surface of the three-dimensional texture exhibits a three-dimensional texture corresponding to the carbon fiber fabric after being heated and pressurized. Therefore, the method of the present invention can present a three-dimensional texture on the surface of the thermoplastic resin when the thermoplastic resin is immersed in the carbon fiber fabric, thereby having the advantages of simple process and more economical benefits, and the carbon fiber composite material obtained is more aesthetically pleasing. Visually more varied, and can increase applicability.

A‧‧‧ thermoplastic resin

A'‧‧‧Resin

B, B'‧‧‧ carbon fiber fabric

B1, B1'‧‧‧ transverse fiber of carbon fiber fabric

B2, B2'‧‧‧ longitudinal fiber of carbon fiber fabric

C‧‧‧Soft carbon fiber composite

10‧‧‧ hot melt machine

20‧‧‧hot melt coating zone

21‧‧‧ resin tank

22‧‧‧Lola

23‧‧‧Scraper

30‧‧‧Bake area

40‧‧‧heating and pressing zone

41‧‧‧Russian Rolla

42‧‧‧Another Rolla

50‧‧‧Cooling area

1 is a schematic cross-sectional view of a soft carbon fiber composite material of the present invention.

2 is a flow chart of a method of making a soft carbon fiber composite of the present invention.

Figure 3 is a schematic view of the apparatus for making a soft carbon fiber composite of the present invention.

Fig. 4 (A) is a cross-sectional metallographic photograph of a soft carbon fiber composite material of Example 1 of the present invention (magnification 100 times).

Fig. 4 (B) is a cross-sectional metallographic photograph (magnification of 500 times) of the longitudinal fibers of the soft carbon fiber composite material of Example 1 of the present invention.

Figure 4 (C) is a cross section of a transverse fiber of a soft carbon fiber composite material of Example 1 of the present invention. Metallographic photos (magnification 500 times).

5(A) and (C) are photographs of the soft carbon fiber composite material of Example 1 of the present invention; FIGS. 5(B) and (D) are photographs of the conventional fabric composite material of Comparative Example 1, wherein FIG. 5(C) and FIG. 5(D) is a photograph magnified four times as shown in Fig. 5 (A) and Fig. 5 (B), respectively.

Figure 6 is a schematic cross-sectional view of a conventional fabric composite.

The use of the terms "a", "an", and <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; In addition, for the sake of clarity, the dimensions of the various elements and regions may be exaggerated in the drawings and are not drawn to the actual scale.

It is to be understood that any range of values recited in this specification is intended to include all sub-ranges For example, the range from "160 to 190 ° C" includes all sub-ranges between the stated minimum value of 160 ° C and the stated maximum value of 190 ° C (eg from 168 ° C to 187 ° C, 163 ° C to 182 ° C, 170 ° C or 188). °C) and includes the two values, that is, a range including a minimum value equal to or greater than 160 ° C and a maximum value equal to or less than 190 ° C. Because the ranges of values disclosed are continuous, they contain each value between the minimum and maximum values. Unless otherwise stated, the various numerical ranges indicated in this specification are approximate.

Referring to Fig. 1, the present invention relates to a soft carbon fiber composite material comprising: a carbon fiber fabric (B) having a three-dimensional grain surface which is composed of a transverse fiber (B1) of a carbon fiber fabric and a longitudinal fiber of a carbon fiber fabric (B2). a thermoplastic resin (A) which penetrates into the interior of the carbon fiber woven fabric (B) and covers the surface of the carbon fiber woven fabric (B) having at least a three-dimensional grain and having the carbon fiber woven fabric (B) Corresponding to the three-dimensional texture.

Referring to FIG. 2 and FIG. 3, the present invention further relates to a method for manufacturing a soft carbon fiber composite material, comprising: Providing a thermoplastic resin (A) and heating and melting it with a hot melt machine (10) at a hot melt temperature close to the melting point of the thermoplastic resin (A); providing a carbon fiber fabric (B) having a solid shape on at least one surface The texture is passed through the hot-melt coating zone (20), and the molten thermoplastic resin (A) is applied to at least the carbon fiber fabric (B) in a combination of a roller (22) and a doctor blade (23). Surface; baking the carbon fiber fabric (B) coated with the thermoplastic resin (A) through a baking zone (30) to allow the thermoplastic resin (A) to penetrate into the carbon fiber fabric (B); the carbon fiber fabric (B) after the thermoplastic resin (A) is applied and baked and infiltrated and wetted, and then passed through a heated and pressurized zone (40) of a roller group comprising at least one rubber roller (41) and another roller (42). The thermoplastic resin (A) can be sufficiently distributed in the carbon fiber woven fabric (B) by heat and pressure, and the surface of the thermoplastic resin is rendered three-dimensionally textured; and the thermoplastic resin is coated in the cooling zone (50). (A) carbon fiber fabric (B), which cures the thermoplastic resin (A) and integrates with the carbon fiber fabric (B) In soft carbon fiber composite material obtained with the three-dimensional lines (C).

After obtaining the soft carbon fiber composite material (C) with the three-dimensional texture, the invention can be post-processed as needed, as shown in FIG. 2, which can be cut and sewn together with the conductive fabric inner lining to make a three-dimensional shape. Soft fiber products with touch and anti-slide features, such as handbags, suitcases and wallets.

In the present invention, the carbon fiber woven fabric (B) has a thickness of about 0.03 to 1 mm, preferably about 0.06 to 0.8 mm, more preferably about 0.08 to 0.5 mm, most preferably about 0.1 to 0.4 mm, and the carbon fiber woven fabric (B) The above-mentioned specific thickness can promote the impregnation effect and the bondability between the resin and the fiber, and the weight per square meter is between about 30 and 600 g, preferably between about 50 and 500 g, more preferably between about 70 and 400 g. Preferably, between about 90 and 300 g, the carbon fiber fabric (B) has a fiber content of between about 20 and 60%, preferably between about 25 and 55%, more preferably about 30. Between 50%.

In the present invention, the thermoplastic resin (A) is a soft thermoplastic resin, particularly Refers to a soft thermoplastic resin having a Shore A of 50-70, preferably a soft thermoplastic resin of Shore A 55-65, such as Thermoplastic Polyurethane (TPU). , Ethylene Vinyl Acetate (EVA), modified polyethylene (PE) and other soft thermoplastic plastic materials.

The soft carbon fiber composite material (C) obtained in the present invention has a thickness of about 0.1 to 1 mm, preferably about 0.2 to 0.8 mm, more preferably about 0.3 to 0.6 mm.

Wherein, in the hot melt machine (10), the amount of the thermoplastic resin (A) particles is controlled according to the amount required for coating, so that the molten thermoplastic resin (A) can maintain a certain melting time and Temperature, too long or too high a temperature will cause cracking of the resin. In the aspect of using the modified soft thermoplastic polyurea resin (TPU) of Shore A 65, the melting temperature is preferably set to about 160 to 190 ° C; when using the state of EVA and PE In the sample, the melting temperature was set to about 155 to 185 °C.

In the present invention, the hot melt coating zone (20) comprises a resin tank (21), a controllable coating amount of the doctor blade (23) and the coating roller (22), and the gap between the doctor blade (23) and the roller (22) is utilized. The coating amount required can be controlled, and when the doctor blade (23) is applied, the thermoplastic resin (A) can be uniformly applied to the surface of the carbon fiber woven fabric (B).

In the present invention, the temperature of the baking zone (30) is about 5 to 30 ° C higher than the aforementioned hot melt temperature, preferably about 5 to 25 ° C, more preferably about 5 to 20 ° C, and the optimum height is About 10 to 20 ° C. The time during which the carbon fiber woven fabric (B) coated with the thermoplastic resin (A) stays in the baking zone (30) is controlled to be about 20 to 90 seconds, preferably about 25 to 75 seconds, more preferably about 30 to 60 seconds, preferably about 35 to 50 seconds, for increasing the flow of the thermoplastic resin (A) for the purpose of high temperature baking to increase the penetration of the thermoplastic resin (A) into the carbon fiber fabric (B) Wet carbon fiber fabric (B).

In the present invention, the baking zone (30) is carried out by infrared rays, electric heating, electromagnetic heating or the like.

In the present invention, the roller group in the heated and pressurized zone (40) provides a processing temperature similar to the temperature at which the resin is melted, and the temperature difference is between about 5 ° C and about 30 ° C, preferably about 10 ° C to about 25 ° C. More preferably, it is between about 10 ° C and about 20 ° C, and a pressure of about 5 to 30 kgf / cm ² , preferably about 5 to 25 kgf / cm ² , more preferably about 10 to 20 kgf / cm ² The pressure is such that the thermoplastic resin (A) can be pressurized under a molten state to sufficiently bond the interface between the thermoplastic resin (A) and the carbon fiber woven fabric (B).

In the present invention, the rubber roller (41) in the heating and pressurizing zone (40) is a steel wheel covered with rubber on the surface, wherein the rubber surface hardness is controlled to a hardness of 60 A-75 (Shore A), When the surface of the carbon fiber woven fabric (B) coated with the thermoplastic resin (A) is pressurized, the surface of the carbon fiber woven fabric (B) coated with the thermoplastic resin (A) is not flattened due to excessive pressure. The effect is such that the obtained soft carbon fiber composite material (C) has a three-dimensional texture of the original carbon fiber fabric (B).

In an embodiment of the invention, when a surface of the carbon fiber woven fabric (B) has a three-dimensional texture, the roller group in the heating and pressing zone (40) comprises a rubber roller (41), and the carbon fiber fabric is pressed. The surface has a three-dimensional texture; the other roller (42) can be a steel roller.

In another embodiment of the present invention, when both surfaces of the carbon fiber woven fabric (B) have a three-dimensional texture, the roller group in the heating and pressing zone (40) may include two rubber rollers (41), respectively The carbon fiber fabric is pressed to have two surfaces of a three-dimensional texture.

In still another embodiment of the present invention, when both surfaces of the carbon fiber woven fabric (B) have a three-dimensional texture, the roller group in the heating and pressing zone (40) may further include a rubber roller (41) and a Steel roller. Generally, when the pressing force is below 20 kgf/cm ² , the combination of two rubber rollers has good resin penetration and impregnation effects, and the surface of the composite material has a good three-dimensional effect. However, if the fabric is a thick fabric with a thickness of more than 0.4 mm and the pressure is required to exceed a pressure of 20 kgf/cm ² to obtain a good impregnation quality effect, if a combination of two rubber rollers is used, excessive pressure will cause the fabric to be made. Defective problems such as deformation and grain skew can be used, so a rubber roller and a steel roller group can be used to ensure the quality of the fabric. However, if a rubber roller and a steel roller group are used, the three-dimensional feeling of the fiber fabric in contact with the steel roller is slightly weaker, and the combination of the two rubber rollers is more three-dimensional. good.

In the present invention, the cooling zone (50) is maintained at a temperature of from about 0 to 20 ° C, preferably from about 5 to 15 ° C, more preferably from about 5 to 10 ° C, preferably in a cold-blowing system; The time is about 20 to 60 seconds, preferably about 20 to 50 seconds, more preferably 20 to 40 seconds. The length setting of the cooling zone must take into account the cooling effect. The cooling time varies depending on the speed of processing and the type of resin. Usually, a residence cooling time of 20 to 40 seconds is required at 5-10 °C. If the cooling effect is insufficient, the resin surfaces will adhere to each other, and the different resins will vary depending on the glass transition point of the resin.

Example: Example 1

A polyurea resin (TPU) of Shore A 65 and a carbon fiber twill fabric having a thickness of 0.28 mm and a weight of 248 g per square meter are provided, and the polyurea resin is heated by a hot melt machine to 180 ° C to be melted. And coating it on the surface of the carbon fiber twill fabric with a combination of a roller and a doctor blade, and then baking it at 205 ° C for 40 seconds via infrared rays, so that the polyurea resin penetrates into the fiber of the carbon fiber twill fabric, and the hardness is included by the hardness. The rubber roller of A (Shore A) 65 and the roller group of steel roller are pressed at a temperature of 160 ° C and a pressure of 16 kgf / cm ² to fully distribute the thermoplastic resin in the carbon fiber fabric and make the surface appear three-dimensional. Texture; finally, the carbon fiber twill fabric coated with polyurea resin was cooled at 7 ° C, the line speed was 2 m / min, and the cooling was left for 30 seconds to cure the polyurea resin and integrate with the carbon fiber twill fabric to obtain a three-dimensional texture. The soft carbon fiber composite material has a thickness of 0.56 mm.

Examples 2 to 7

The manufacturing method was the same as in Example 1, and the materials, process conditions and results used are shown in Table 1.

4(A) to (C), which are cross-sectional metallographic photographs of the soft carbon fiber composite material of Example 1, wherein FIG. 4(A) shows the transverse fibers (B1) of the carbon fiber twill fabric and the longitudinal fibers of the carbon fiber fabric ( B2) The combination with the polyurea resin (A) is excellent in coating property and has no obvious voids.

"Hollow hole" is a bubble in which the resin composite material is poorly impregnated with resin or the resin cannot flow sufficiently during impregnation and heat pressurization, so that the resin cannot completely cover the fiber, causing residual air to form bubbles between the fibers, and curing the composite material. After that, an empty hole is formed, which is called an empty hole. A composite material with poor forming and containing a large number of voids will not effectively bond the fibers to the resin. For soft composites, the voids will cause the fibers to be pulled out of the resin or appear on the surface during subsequent sewing operations. crack.

Comparative example 1

A composite molded article produced by the method disclosed in TW410196 was used as a comparative example.

Comparing results

Referring to Figure 5, there is shown the surface of the soft carbon fiber composites (A) and (C) obtained in Example 1 of the present invention and the conventional fabric composites (B) and (D) in Comparative Example 1, wherein Figure 5 (A) And (C), it can be clearly observed that the surface of the soft carbon fiber composite material of the present invention exhibits a distinct three-dimensional texture, and it can be seen from Fig. 5 (B) and (D) that the texture of the conventional fabric composite material is not obvious, as compared with In the context of the present invention, the surface of a conventional fabric composite exhibits a flat feel.

Referring again to FIG. 1 and FIG. 6, which are respectively schematic cross-sectional views of the soft carbon fiber composite material and the traditional textile composite material of the present invention, it can be understood from FIG. 6 that the resin (A') covered in the conventional fabric composite material cannot be extended. The three-dimensional texture of the transverse fiber (B1') of the carbon fiber fabric and the longitudinal fiber (B2') of the carbon fiber fabric produces a corresponding three-dimensional texture, and the surface of the conventional textile composite material is planar. It can be clearly seen from Fig. 1 that the thermoplastic resin (A) covered by the surface of the carbon fiber woven fabric of the present invention can be formed by the transverse fiber (B1) of the carbon fiber woven fabric and the longitudinal fiber (B2) of the carbon fiber woven fabric. The three-dimensional texture. Therefore, the soft carbon fiber composite material produced by the method provided by the invention can The surface presents a three-dimensional texture.

Example 8

The soft carbon fiber composite materials obtained in Examples 1 to 7 can be post-processed and sewn together with the conductive fabric to make products such as handbags, trunks and wallets. Table 2 below compares general cowhide, both glass fiber silver plating, conductive fabric provided by the applicant in TW1325907 (copper cloth surface electroplated copper), soft carbon fiber composite material obtained in Example 1, and the above conductive fabric (as lining) The EMI shielding property after the sewing of the soft carbon fiber composite material obtained in Example 1. It can be seen from Table 2 that the soft carbon fiber composite material of the present invention has a relatively good EMI shielding property, and if the soft carbon fiber composite material of the present invention is combined with the conductive fabric, the shielding effect of the original conductive fabric can be further increased, thereby effectively preventing Electronic side recording.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are illustrative of the technical features of the present invention and are not intended to limit the scope of the present invention. Any changes or arrangements that can be easily accomplished by those skilled in the art without departing from the technical principles and spirit of the invention are within the scope of the invention. Accordingly, the scope of the invention is set forth in the appended claims.

Claims (16)

A method of manufacturing a soft carbon fiber composite material, comprising: providing a thermoplastic resin and heating and melting thereof; providing a carbon fiber fabric having a three-dimensional texture on at least one surface, and coating the molten thermoplastic resin on at least the carbon fiber The fabric has a three-dimensional grain surface; a carbon fiber fabric coated with a thermoplastic resin is baked to infiltrate the thermoplastic resin into the carbon fiber fabric; and the carbon fiber fabric coated with the thermoplastic resin is heated and pressurized to be thermoplastic The surface of the resin exhibits the three-dimensional texture, wherein the step of pressurizing presses the surface of the carbon fiber fabric having a three-dimensional texture using at least one soft pressing device; and cooling the carbon fiber fabric coated with the thermoplastic resin to make the thermoplasticity The resin is cured to obtain the soft carbon fiber composite. The method of claim 1, wherein the step of pressurizing is performed using a combination comprising a soft pressurizing device and a hard pressurizing device. The method of claim 1, wherein the step of pressurizing is performed using a combination comprising two soft pressurizing devices. The method of any one of claims 1 to 3, wherein the pressurizing device is a roller. The method of any one of claims 1 to 3, wherein the soft pressurizing device is a rubber roller having a surface having a Shore A hardness of 60 to 75. The method of any one of claims 1 to 3, wherein the baking is performed by infrared, electrothermal or electromagnetic heating. The method of claim 6, wherein the temperature by infrared baking is higher than the temperature of heating and melting the thermoplastic resin by about 5 to 30 ° C, and the carbon fiber fabric coated with the thermoplastic resin is baked by the infrared ray by about 20 Up to 90 seconds. The method of any one of claims 1 to 3, wherein the carbon fiber woven fabric has a thickness of about 0.03 to 1 mm, a weight per square meter of between about 30 and 600 g, and a fiber content of between about 20 and 60%. between. The method of any one of claims 1 to 3, wherein the thermoplastic resin is a soft thermoplastic resin having a Shore A hardness of 50 to 70, wherein the thermoplastic resin is selected from the group consisting of polyurea resin (TPU), A group consisting of ethylene/vinyl acetate copolymer (EVA) and modified polyethylene (PE). The method of any one of claims 1 to 3, wherein the soft carbon fiber composite has a thickness of about 0.1 to 1 mm. The method of any one of claims 1 to 3, wherein the heating and pressurizing the carbon fiber fabric coated with the thermoplastic resin is at a temperature of about 160 to 190 ° C and a pressure of about 5 to 30 kgf / cm ² get on. The method of any one of claims 1 to 3, wherein the temperature of the carbon fiber fabric coated with the thermoplastic resin is cooled to a temperature of about 0 to 20 ° C, and the cooling residence time is about 20 to 60 seconds. A soft carbon fiber composite material comprising: a carbon fiber fabric having a surface of a three-dimensional grain; and a thermoplastic resin penetrating into the interior of the carbon fiber fabric and covering the surface of the carbon fiber fabric having at least a three-dimensional grain and having the carbon fiber The three-dimensional texture corresponding to the fabric. A soft carbon fiber composite material according to claim 13, wherein the carbon fiber woven fabric has a thickness of from about 0.03 to 1 mm, a weight per square meter of between about 30 and 600 g, and a fiber content of between about 20 and 60%. The soft carbon fiber composite material of claim 14, wherein the thermoplastic resin is a soft thermoplastic resin having a hardness of Shore A 50-70, wherein the thermoplastic resin is selected from the group consisting of polyurea resin (TPU), ethylene/vinyl acetate. A group of copolymers (EVA) and modified polyethylene (PE). The soft carbon fiber composite material according to any one of claims 13 to 15, wherein the soft carbon fiber composite material has a thickness of about 0.1 to 1 mm.