Ultra-thin carbon fiber sound cone and preparation method and application thereof

Abstract

The present invention discloses an ultra-thin carbon fiber sound basin and its preparation method and application. The ultra-thin carbon fiber sound basin of the present invention comprises the following components by weight: 90-100 parts of carbon fiber woven cloth, 7-28 parts of epoxy resin, 3-12 parts of curing agent, 0.0001-5 parts of color paste, and 0.1-1 parts of defoaming agent. The carbon fiber sound basin prepared by the present invention has thin thickness, high strength, good moisture resistance, and good environmental stability. Under relatively harsh environmental conditions, it still has high stability in the frequency response of mid-high tones, can be processed in various shapes and colors, and has different characteristics in appearance. It is suitable for the preparation of car speakers and outdoor speakers.

Description

Technical Field

[0001] The present invention relates to the technical field of sound cones, and in particular to a carbon fiber sound cone, a preparation method and an application thereof, and in particular to an ultra-thin carbon fiber sound cone, a preparation method and an application thereof. Background Art

[0002] The cone is a key component of the speaker's vibration and sound generation. Its performance largely determines the speaker's effective frequency range, distortion and sound quality. At present, the cone is mostly made of paper or plastic, but the cones made of these materials are not rigid enough, which will cause the speaker to vibrate at high frequencies and affect the speaker's sound quality. Carbon fiber cones have good rigidity and have been widely used in speakers. In recent years, it has become a trend to use carbon fiber cones as full-band speakers and subwoofers.

[0003] Carbon fiber has excellent performance, high axial strength and modulus, 20 times the strength of steel, 2-3 times the tensile modulus of steel, only 1 / 4 of the specific gravity of steel, and 7.9 times the tensile strength of steel. The Young's modulus of carbon fiber is about 3 times that of traditional glass fiber and about 2 times that of Kevlar fiber (KF-49). At the same time, carbon fiber does not dissolve or swell in organic solvents, acids, and alkalis, and has outstanding corrosion resistance. Carbon fiber composite materials, with their light weight, high strength and stiffness, and strong designability, not only meet our requirements for product quality, but also meet the needs of lightweight applications. It can be said that carbon fiber material is an ideal material for sound basins.

[0004] At present, the carbon fiber materials used in speaker cones are divided into the following categories: First, single-layer carbon fiber woven cloth is surface-treated and used in car audio. This type of carbon fiber cone has good weather resistance, but its strength and air tightness still need to be improved; second, carbon fiber cloth / carbon fiber board and foam core layer are compounded into a sandwich structure. This type of carbon fiber composite cone has a higher specific modulus and also exhibits good acoustic performance, but its overall thickness is relatively thick, which is more limited in the application of thin and light speaker cones; third, speaker cones formed by hot-pressing carbon fiber prepregs. This type of carbon fiber cone has a higher resin content and is limited by the elongation of carbon fiber prepregs, so it is impossible to form a carbon fiber cone with complex curves.

[0005] CN112211000A discloses a composite vibration plate for a loudspeaker and its preparation method and application, wherein the composite vibration plate comprises a first surface layer, a first carbon fiber layer, a porous intermediate layer and a reinforcement layer arranged in sequence, wherein the reinforcement layer comprises a second carbon fiber layer and / or a second surface layer; the first surface layer and the second surface layer are metal layers. By screening a variety of materials with light weight and high strength characteristics, and by a special design of a hierarchical structure, the composite vibration plate is endowed with the characteristics of low density, high strength and high modulus, which significantly improves the mechanical properties of the material without increasing weight, and can achieve a diversified appearance through a surface treatment process. As a vibration material for a loudspeaker, the composite vibration plate is particularly suitable for use in flat-panel loudspeakers, and can fully meet the performance requirements of high sensitivity and high cutoff frequency of the loudspeaker. However, the limitations of this method are relatively obvious. First, the overall thickness of the sound basin is relatively thick, and its application in thin and light loudspeakers is relatively limited; second, this method is limited to the sound basin of a flat-panel loudspeaker, and a carbon fiber sound basin with a complex curved surface cannot be formed.

[0006] CN114979930A discloses a method for producing a loudspeaker diaphragm dome, comprising the following steps: S1: spraying a mold with a release agent; S2: cutting a carbon fiber layer and laying it in the lower membrane cavity of the mold; S3: closing the mold and heating and curing the carbon fiber layer; S4: demolding and forming after curing. The composite material produced by this scheme is lighter and has higher strength, the adhesive material is firmly bonded, the heat resistance is stronger, and the sound quality performance in the high-frequency range above the high-frequency band is better.

[0007] CN216873388U discloses a speaker drum paper with a multi-layer composite structure, including a body and a rubber edge, wherein the projection of the body in the horizontal direction is designed as a ring structure, and the inner side of the body is tilted downward so that the projection of the body as a whole on the vertical plane is designed as a frustum-shaped structure; the rubber edge is designed as a ring structure as a whole and is sleeved and connected to the outside of the body, and the inner edge of the rubber edge is connected to the outer edge of the body; it is characterized in that the body includes a first powder rubber layer and a second powder rubber layer arranged in a stacked manner, and a fine-grained glass fiber layer, a mesh layer and a fine carbon fiber layer are arranged between the first powder rubber layer and the second powder rubber layer. The first powder rubber layer, the second powder rubber layer, the fine-grained glass fiber layer, the mesh layer and the fine carbon fiber layer are compounded together by high-temperature hot pressing. The carbon fiber sound basin in this technical solution has a high resin content, which is not conducive to achieving the lightweight requirement of the sound basin.

[0008] Therefore, it is necessary to develop an ultra-thin carbon fiber diaphragm with thin thickness, high strength, and easy molding of complex curved surfaces, as well as a preparation method and application thereof. Summary of the invention

[0009] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an ultra-thin carbon fiber cone and a preparation method and application thereof. The prepared carbon fiber cone has a thin thickness, high strength, good moisture resistance, and good environmental stability. Under relatively harsh environmental conditions, it still has high stability in the frequency response of mid- and high-frequency sounds. It can be processed in various shapes and colors and exhibits different characteristics in appearance. It is suitable for the preparation of car speakers and outdoor speakers.

[0010] One of the purposes of the present invention is to provide an ultra-thin carbon fiber sound cone. To achieve this purpose, the present invention adopts the following technical solutions:

[0011] An ultra-thin carbon fiber sound cone comprises the following components in parts by weight:

[0012]

[0013] The ultra-thin carbon fiber sound cone of the present invention is prepared by selecting appropriate carbon fiber woven cloth and completely infiltrating and penetrating epoxy resin into the pores of the carbon fiber woven cloth. The surface glue layer of the carbon fiber sound cone is complete, continuous, without glue deficiency and air leakage. The prepared carbon fiber sound cone has good moisture resistance and good environmental stability. The carbon fiber sound cone of the present invention has a high Young's modulus and a high specific modulus. The speaker has a more extended amplitude frequency response curve, and the linearity of the phase frequency response curve is much better than that of the paper cone speaker. In addition, the appearance of the carbon fiber sound cone of the present invention can be processed in various shapes and colors, showing different characteristics in appearance, and is suitable for the preparation of car speakers and outdoor speakers.

[0014] It should be noted that the ultra-thin carbon fiber cone described in the present invention refers to a carbon fiber cone with a thickness of less than 0.2 mm, especially a carbon fiber cone with a thickness of less than 0.11 mm.

[0015] Specifically, an ultra-thin carbon fiber sound cone comprises the following components by weight:

[0016] The weight proportion of the carbon fiber woven cloth is 90-100 parts, for example, 90 parts, 91 parts, 92 parts, 93 parts, 94 parts, 95 parts, 96 parts, 97 parts, 98 parts, 99 parts, 100 parts, etc.

[0017] The weight parts of epoxy resin are 7-28 parts, for example, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, etc.

[0018] The weight proportion of the curing agent is 3-12 parts, for example, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, etc.

[0019] The weight proportion of the color paste is 0.0001-5 parts, for example, 0.0001 parts, 0.0005 parts, 0.001 parts, 0.005 parts, 0.01 parts, 0.05 parts, 0.1 parts, 0.5 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, etc.

[0020] The weight portion of the defoaming agent is 0.1-1 part, for example, 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1 part, etc.

[0021] In the present invention, the carbon fiber woven cloth is a plain carbon fiber cloth, preferably a 1-1.5K plain carbon fiber cloth. The carbon fiber woven cloth is woven from bundles of carbon fiber filaments, wherein 1K represents a bundle of carbon fiber cloth containing 1000 filaments, and similarly 1.5K represents a bundle of carbon fiber cloth containing 1500 filaments.

[0022] In the present invention, the epoxy resin is an epoxy lamination resin, preferably epoxy resin EL2. The epoxy resin used in the present invention has moisture resistance, and the prepared carbon fiber sound basin has good moisture resistance and good environmental stability. Under relatively harsh environmental conditions, it still has high stability in the frequency response of mid-high frequencies, and is particularly suitable for car speakers and outdoor speakers.

[0023] In the present invention, the curing agent is an amine curing agent, preferably AY30 FAST.

[0024] In the present invention, the mass ratio of the epoxy resin to the curing agent is (6-8):(2-4), for example, the mass ratio of the epoxy resin to the curing agent is 6:4, 7:3, 8:2, etc., preferably 7:3.

[0025] In the present invention, the color paste comprises epoxy color paste, preferably an environmentally friendly epoxy color paste of model YS.

[0026] In the present invention, the defoaming agent comprises a foam-breaking polysiloxane solution.

[0027] The second object of the present invention is to provide a method for preparing the ultra-thin carbon fiber sound cone as described in the first object, comprising the following steps:

[0028] S1: Spraying a release agent on the upper mold and the lower mold of the carbon fiber sound cone forming mold respectively;

[0029] S2: cutting the carbon fiber woven fabric and shaping the four sides of the carbon fiber woven fabric;

[0030] S3: Evenly mix the epoxy resin and curing agent according to the proportion, add color paste to adjust the color, and add defoaming agent after adjusting the color;

[0031] S4: placing the carbon fiber woven fabric cut in S2 in a bag, and pouring the epoxy resin mixed in S3 into the bag, so that the epoxy resin is distributed on the surface of the carbon fiber woven fabric;

[0032] S5: Let it stand to allow the epoxy resin to penetrate into the pores of the carbon fiber woven cloth;

[0033] S6: Take out the carbon fiber woven cloth soaked with epoxy resin in S5 from the bag, and lay it flat on the lower mold of the carbon fiber sound cone molding mold;

[0034] S7: Start the hot press machine and close the mold for hot pressing;

[0035] S8: After hot pressing, the mold is cooled to room temperature to obtain the ultra-thin carbon fiber sound cone.

[0036] The preparation method of the present invention is simple and has strong feasibility. By selecting appropriate carbon fiber woven cloth and reasonable hot pressing conditions, an ultra-thin carbon fiber sound basin with a thickness of ≤0.11mm is prepared; by setting a reasonable standing time, the epoxy resin is completely infiltrated and penetrated into the pores of the carbon fiber woven cloth, and the surface adhesive layer of the prepared carbon fiber sound basin is complete, continuous, without glue deficiency and air leakage; by sealing the edges with adhesive tape and completing the glue dipping in a self-sealing bag, the carbon fiber bundles of the carbon fiber woven cloth are prevented from detaching or deforming, and the prepared carbon fiber sound basin has clear texture and beautiful appearance, and can be processed in various shapes and colors to show different characteristics in appearance.

[0037] As a preferred embodiment of the present invention, the method for preparing the ultra-thin carbon fiber cone comprises the following steps:

[0038] S1: Spraying a release agent on the upper mold and the lower mold of the carbon fiber sound cone molding mold respectively;

[0039] S2: Cut the carbon fiber woven cloth into a square slightly larger than the mold, and stick adhesive tape on the four sides of the carbon fiber woven cloth to prevent the fiber bundles of the carbon fiber woven cloth from detaching and deforming;

[0040] S3: Epoxy resin and curing agent are mixed evenly in a ratio of 7:3, and color paste is added to adjust the color according to product requirements. Color paste may not be added, and defoaming agent is added after color adjustment;

[0041] S4: Spread the cut carbon fiber woven cloth in S2 flat in a ziplock bag, and pour the mixed epoxy resin in S3 into the ziplock bag, so that the epoxy resin is distributed on the surface of the carbon fiber woven cloth, and roll the aluminum alloy defoaming roller back and forth outside the ziplock bag to evenly distribute the epoxy resin on the surface of the carbon fiber woven cloth and eliminate bubbles;

[0042] S5: Let stand for 12-17 minutes to allow the epoxy resin to penetrate into the pores of the carbon fiber woven cloth;

[0043] S6: Take out the carbon fiber woven cloth soaked with epoxy resin in S5 from the ziplock bag and lay it flat on the lower mold of the carbon fiber sound cone molding mold;

[0044] S7: Start the hot press machine, close the mold and perform hot pressing, the hot pressing pressure is 0.1-0.5 MPa, the hot pressing temperature is 120-180° C., and the hot pressing time is 30-45 min;

[0045] S8: After hot pressing, the mold is cooled to room temperature to obtain the ultra-thin carbon fiber sound cone.

[0046] In step S5, the standing time is 12-17 minutes, for example, it can be 12 minutes, 13 minutes, 14 minutes, 15 minutes, 16 minutes, and 17 minutes; when the standing time is less than 12 minutes, the epoxy resin has not completely penetrated into the pores of the carbon fiber woven cloth, resulting in a lack of glue in the prepared carbon fiber sound basin; when the standing time is greater than 17 minutes, the epoxy resin begins to solidify, which will affect the leveling of the epoxy resin in the molding mold during the hot pressing molding stage, resulting in the prepared carbon fiber sound basin being too thick and uneven in thickness.

[0047] In step S7, the hot pressing pressure is 0.1-0.5MPa, for example, 0.1MPa, 0.2MPa, 0.3MPa, 0.4MPa, 0.5MPa, etc. When the pressure is less than 0.1MPa, the thickness of the prepared carbon fiber sound basin is too thick; when the pressure is greater than 0.5MPa, the excessive pressure will cause the epoxy resin distributed on the carbon fiber woven cloth to be squeezed out of the molding die, resulting in glue shortage and air leakage on the surface of the prepared carbon fiber sound basin.

[0048] The hot pressing temperature is 120-180°C, for example, it can be 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, etc.; when the hot pressing temperature is less than 120°C, the curing rate of the epoxy resin is too slow; when the hot pressing temperature is greater than 180°C, it exceeds the temperature resistance range of the epoxy resin, and the prepared carbon fiber sound basin turns yellow and becomes brittle.

[0049] The hot pressing time is 30-45 min, for example, it can be 30 min, 31 min, 32 min, 33 min, 34 min, 35 min, 36 min, 37 min, 38 min, 39 min, 40 min, 41 min, 42 min, 43 min, 44 min, 45 min, etc. The specific hot pressing time varies according to the hot pressing temperature.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] The ultra-thin carbon fiber cone of the present invention is thin, which may be less than 0.11 mm, specifically 0.1-0.11 mm, has high strength, a Young's modulus of 15.48-19.56 GPa, and a high specific modulus. The speaker has a relatively extended amplitude frequency response curve, and the linearity of the phase frequency response curve is much better than that of the paper cone speaker. It has good moisture resistance and good environmental stability. Under relatively harsh environmental conditions, it still has high stability in the frequency response of mid- and high-frequency sounds. The surface of the obtained carbon fiber cone is uniform and complete, without air leaks, and the carbon fiber woven cloth does not deform or wrinkle. It can be processed in various shapes and colors, showing different characteristics in appearance, and is suitable for the preparation of car speakers and outdoor speakers. DETAILED DESCRIPTION

[0052] The technical solution of the present invention is further illustrated below through specific implementation methods.

[0053] Unless otherwise specified, various raw materials of the present invention can be purchased from the market or prepared according to conventional methods in the art.

[0054] In the present invention, the carbon fiber woven cloth is purchased from Composites Easy to Buy, and the model is plain carbon fiber cloth 1K-90g; the epoxy resin is purchased from Composites Easy to Buy, and the model is EL-2; the model of the curing agent is AY30 FAST; the color paste is purchased from Dongguan Yisheng Composite Materials Co., Ltd., and the model is an environmentally friendly epoxy color paste with a model of YS; the model of the defoaming agent is BYK-066N.

[0055] Example 1

[0056] This embodiment provides a carbon fiber sound cone, which specifically includes the following components by weight:

[0057] Carbon fiber woven cloth Epoxy resin Curing agent Color paste Defoaming agent 90 servings 7 servings 3 servings 1 serving 0.1 part

[0058] The method for preparing the carbon fiber cone of this embodiment includes the following steps:

[0059] S1: Spraying a release agent on the upper mold and the lower mold of the carbon fiber sound cone molding mold respectively;

[0060] S2: Cut the carbon fiber woven cloth into a square slightly larger than the mold, and stick adhesive tape on the four sides of the carbon fiber woven cloth to prevent the fiber bundles of the carbon fiber woven cloth from detaching and deforming;

[0061] S3: Epoxy resin and curing agent are mixed evenly in a ratio of 7:3, and color paste is added to adjust the color according to product requirements. After adjusting the color, defoaming agent is added;

[0062] S4: Spread the cut carbon fiber woven cloth in S2 flat in a ziplock bag, and pour the mixed epoxy resin in S3 into the ziplock bag, so that the epoxy resin is distributed on the surface of the carbon fiber woven cloth, and roll the aluminum alloy defoaming roller back and forth outside the ziplock bag to evenly distribute the epoxy resin on the surface of the carbon fiber woven cloth and eliminate bubbles;

[0063] S5: Let stand for 12 minutes to allow the epoxy resin to penetrate into the pores of the carbon fiber woven cloth;

[0064] S6: Take out the carbon fiber woven cloth soaked with epoxy resin in S5 from the ziplock bag and lay it flat on the lower mold of the carbon fiber sound cone molding mold;

[0065] S7: Start the hot press, close the mold, set the hot press pressure to 0.3 MPa, and the hot press temperature to 170°C;

[0066] S8: After hot pressing for 35 minutes, the mold is cooled to room temperature to obtain a carbon fiber sound cone.

[0067] Example 2

[0068] This embodiment provides a carbon fiber sound cone, which specifically includes the following components by weight:

[0069] Carbon fiber woven cloth Epoxy resin Curing agent Color paste Defoaming agent 90 servings 28 servings 12 servings 5 servings 1 serving

[0070] The method for preparing the carbon fiber cone of this embodiment includes the following steps:

[0071] S1: Spraying a release agent on the upper mold and the lower mold of the carbon fiber sound cone molding mold respectively;

[0072] S2: Cut the carbon fiber woven cloth into a square slightly larger than the mold, and stick adhesive tape on the four sides of the carbon fiber woven cloth to prevent the fiber bundles of the carbon fiber woven cloth from detaching and deforming;

[0073] S3: Epoxy resin and curing agent are mixed evenly in a ratio of 7:3, and color paste is added to adjust the color according to product requirements. After adjusting the color, defoaming agent is added.

[0074] S4: Spread the cut carbon fiber woven cloth in S2 flat in a ziplock bag, and pour the mixed epoxy resin in S3 into the ziplock bag to distribute the epoxy resin on the surface of the carbon fiber woven cloth. Roll the aluminum alloy defoaming roller back and forth outside the ziplock bag to evenly distribute the epoxy resin on the surface of the carbon fiber woven cloth and eliminate bubbles;

[0075] S5: Let stand for 17 minutes to allow the epoxy resin to penetrate into the pores of the carbon fiber woven cloth;

[0076] S6: Take out the carbon fiber woven cloth soaked with epoxy resin in S5 from the ziplock bag and lay it flat on the lower mold of the carbon fiber sound cone molding mold;

[0077] S7: Start the hot press, close the mold, set the hot press pressure to 0.5 MPa, and the hot press temperature to 180°C;

[0078] S8: After hot pressing for 30 minutes, the mold is cooled to room temperature to obtain a carbon fiber cone.

[0079] Example 3

[0080] This embodiment provides a carbon fiber sound cone, which specifically includes the following components by weight:

[0081]

[0082]

[0083] The method for preparing the carbon fiber cone of this embodiment includes the following steps:

[0084] S1: Spraying a release agent on the upper mold and the lower mold of the carbon fiber sound cone molding mold respectively;

[0085] S2: Cut the carbon fiber woven cloth into a square slightly larger than the mold, and stick adhesive tape on the four sides of the carbon fiber woven cloth to prevent the fiber bundles of the carbon fiber woven cloth from detaching and deforming;

[0086] S3: Epoxy resin and curing agent are mixed evenly in a ratio of 7:3, and color paste is added to adjust the color according to product requirements. After adjusting the color, defoaming agent is added.

[0087] S4: Spread the cut carbon fiber woven cloth in S2 flat in a ziplock bag, and pour the mixed epoxy resin in S3 into the ziplock bag to distribute the epoxy resin on the surface of the carbon fiber woven cloth. Roll the aluminum alloy defoaming roller back and forth outside the ziplock bag to evenly distribute the epoxy resin on the surface of the carbon fiber woven cloth and eliminate bubbles;

[0088] S5: Let stand for 15 minutes to allow the epoxy resin to penetrate into the pores of the carbon fiber woven cloth;

[0089] S6: Take out the carbon fiber woven cloth soaked with epoxy resin in S5 from the ziplock bag and lay it flat on the lower mold of the carbon fiber sound cone molding mold;

[0090] S7: Start the hot press machine and close the mold. Set the hot press pressure to 0.1MPa and the hot press temperature to 120℃;

[0091] S8: After hot pressing for 45 minutes, the mold is cooled to room temperature to obtain a carbon fiber diaphragm.

[0092] Example 4

[0093] This embodiment provides a carbon fiber sound cone, which specifically includes the following components by weight:

[0094] Carbon fiber woven cloth Epoxy resin Curing agent Color paste Defoaming agent 90 servings 21 servings 9 servings 0.0001 copy 0.6 parts

[0095] The method for preparing the carbon fiber cone of this embodiment includes the following steps:

[0096] S1: Spraying a release agent on the upper mold and the lower mold of the carbon fiber sound cone molding mold respectively;

[0097] S2: Cut the carbon fiber woven cloth into a square slightly larger than the mold, and stick adhesive tape on the four sides of the carbon fiber woven cloth to prevent the fiber bundles of the carbon fiber woven cloth from detaching and deforming;

[0098] S3: Epoxy resin and curing agent are mixed evenly in a ratio of 7:3, and color paste is added to adjust the color according to product requirements. After adjusting the color, defoaming agent is added.

[0099] S4: Spread the cut carbon fiber woven cloth in S2 flat in a ziplock bag, and pour the mixed epoxy resin in S3 into the ziplock bag to distribute the epoxy resin on the surface of the carbon fiber woven cloth. Roll the aluminum alloy defoaming roller back and forth outside the ziplock bag to evenly distribute the epoxy resin on the surface of the carbon fiber woven cloth and eliminate bubbles;

[0100] S5: Let stand for 16 minutes to allow the epoxy resin to penetrate into the pores of the carbon fiber woven cloth;

[0101] S6: Take out the carbon fiber woven cloth soaked with epoxy resin in S5 from the ziplock bag and lay it flat on the lower mold of the carbon fiber sound cone molding mold;

[0102] S7: Start the hot press and close the mold. Set the hot press pressure to 0.4MPa and the hot press temperature to 150℃;

[0103] S8: After hot pressing for 32 minutes, the mold is cooled to room temperature to obtain a carbon fiber sound cone.

[0104] Example 5

[0105] The difference between this embodiment and the first embodiment is that the carbon fiber woven cloth is a 3K carbon fiber woven cloth, and the rest is the same as the first embodiment.

[0106] Example 6

[0107] The difference between this embodiment and embodiment 1 is that the mass ratio of epoxy resin to curing agent is 5:5, and the other aspects are the same as those of embodiment 1.

[0108] Example 7

[0109] The difference between this embodiment and embodiment 1 is that the mass ratio of epoxy resin to curing agent is 9:1, and the other aspects are the same as those of embodiment 1.

[0110] Example 8

[0111] The difference between this embodiment and embodiment 1 is that in step S5, the standing time is 10 minutes, and the rest is the same as that of embodiment 1.

[0112] Example 9

[0113] The difference between this embodiment and embodiment 1 is that in step S5, the standing time is 20 minutes, and the rest is the same as that of embodiment 1.

[0114] Example 10

[0115] The difference between this embodiment and embodiment 1 is that in step S7, the hot pressing pressure is 0.05 MPa, and the rest is the same as that of embodiment 1.

[0116] Embodiment 11

[0117] The difference between this embodiment and embodiment 1 is that in step S7, the hot pressing pressure is 0.7 MPa, and the rest is the same as that of embodiment 1.

[0118] Example 12

[0119] The difference between this embodiment and embodiment 1 is that in step S7, the hot pressing temperature is 100° C., and the rest is the same as that of embodiment 1.

[0120] Embodiment 13

[0121] The difference between this embodiment and embodiment 1 is that in step S7, the hot pressing temperature is 200° C., and the rest is the same as that of embodiment 1.

[0122] Comparative Example 1

[0123] The difference between this comparative example and Example 1 is that the epoxy resin is reduced to 5 parts, and the reduced amount of epoxy resin is evenly added to other components to ensure that the total amount remains unchanged. The rest are the same as in Example 1.

[0124] Comparative Example 2

[0125] The difference between this comparative example and Example 1 is that the epoxy resin is increased to 40 parts, and the increased amount of epoxy resin is deducted from other components on average to ensure that the total amount remains unchanged. The others are the same as in Example 1.

[0126] Comparative Example 3

[0127] The difference between this comparative example and Example 1 is that the epoxy resin is replaced by phenolic resin 2402, and the rest is the same as that of Example 1.

[0128] Comparative Example 4

[0129] The difference between this comparative example and Example 1 is that the carbon fiber woven cloth is replaced by glass fiber woven cloth, and the other aspects are the same as those of Example 1.

[0130] The performance of the carbon fiber cones prepared in Examples 1-13 and Comparative Examples 1-4 were tested, and the test results are shown in Table 1.

[0131] The test of Young's modulus is carried out in accordance with GB T 8812.2-2007, the standard for determination of flexural properties of rigid foam plastics.

[0132] Table 1

[0133]

[0134]

[0135] It can be seen from the data in Table 1 that the ultra-thin carbon fiber cone of the present invention is thin, which may be less than 0.11 mm, specifically 0.1-0.11 mm, has high strength, a Young's modulus of 15.48-19.56 GPa, and a high specific modulus. The speaker has a relatively extended amplitude frequency response curve, and the linearity of the phase frequency response curve is much better than that of the paper cone speaker. It has good moisture resistance and good environmental stability. Under relatively harsh environmental conditions, it still has high stability in the frequency response of mid- and high-frequency sounds. The surface of the obtained carbon fiber cone is uniform and complete, without air leaks, and the carbon fiber woven cloth does not deform or wrinkle. It can be processed in various shapes and colors, showing different characteristics in appearance, and is suitable for the preparation of car speakers and outdoor speakers.

[0136] Example 5: Replacing the carbon fiber woven cloth with 3K carbon fiber woven cloth will make the carbon fiber basin thicker.

[0137] Example 6: If the mass ratio of epoxy resin to curing agent is too small, the carbon fiber basin molding effect will be poor and the modulus will be reduced.

[0138] Example 7: If the mass ratio of epoxy resin to curing agent is too large, the carbon fiber basin molding effect will be poor and the modulus will be reduced.

[0139] In Example 8, the standing time is too short, so that the epoxy resin cannot completely penetrate into the pores of the carbon fiber woven cloth, and the surface of the prepared carbon fiber basin lacks glue and has air leaks.

[0140] In Example 9, the standing time is too long, which will deteriorate the fluidity of the epoxy resin and make the thickness of the prepared carbon fiber basin too large and uneven.

[0141] Example 10: If the hot pressing pressure is too small, the thickness of the carbon fiber basin will be too large and the Young's modulus will decrease.

[0142] Example 11 If the hot pressing pressure is too high, the density of the carbon fiber basin will be too high and irregular cracks will appear on the surface.

[0143] Example 12: If the hot pressing temperature is too low, the epoxy resin will not be completely cured and the carbon fiber basin cannot be formed.

[0144] Example 13: If the hot pressing temperature is too high, the carbon fiber basin will turn yellow, become brittle, and easily damaged.

[0145] In Comparative Example 1, there is too little epoxy resin, which makes it impossible for the epoxy resin to completely infiltrate the carbon fiber woven cloth, and the prepared carbon fiber basin is partially lacking in glue.

[0146] In Comparative Example 2, too much epoxy resin was added, which resulted in a larger thickness of the prepared carbon fiber basin and a lower Young's modulus.

[0147] In Comparative Example 3, phenolic resin was used instead of epoxy resin, and the carbon fiber basin prepared was yellow and the Young's modulus was also reduced.

[0148] In Comparative Example 4, glass fiber woven cloth was used instead of carbon fiber woven cloth, and the Young's modulus of the prepared sound basin decreased.

[0149] The present invention illustrates the detailed process equipment and process flow of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned detailed process equipment and process flow, that is, it does not mean that the present invention must rely on the above-mentioned detailed process equipment and process flow to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0150] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0151] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0152] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An ultra-thin carbon fiber cone for a car speaker or an outdoor speaker, characterized in that: By weight, it contains the following components: The thickness of the ultra-thin carbon fiber sound cone is less than 0.11 mm; The carbon fiber woven cloth is a 1-1.5K plain weave carbon fiber cloth; The epoxy resin completely penetrates into the pores of the carbon fiber woven cloth; The epoxy resin is an epoxy laminating resin; The curing agent is an amine curing agent; The mass ratio of the epoxy resin to the curing agent is (6-8):(2-4).

2. The ultra-thin carbon fiber cone according to claim 1, characterized in that: The epoxy resin is epoxy resin EL2.

3. The ultra-thin carbon fiber cone according to claim 1, characterized in that: The curing agent is AY30 FAST.

4. The ultra-thin carbon fiber cone according to claim 1, characterized in that: The color paste comprises epoxy color paste.

5. The ultra-thin carbon fiber cone according to claim 1, characterized in that: The defoamer comprises a foam-breaking polysiloxane solution.

6. A method for preparing an ultra-thin carbon fiber sound cone according to any one of claims 1 to 5, characterized in that: The preparation method comprises the following steps: S1: Spraying a release agent on the upper mold and the lower mold of the carbon fiber sound cone forming mold respectively; S2: cutting the carbon fiber woven fabric and shaping the four sides of the carbon fiber woven fabric; S3: Evenly mix the epoxy resin and curing agent according to the proportion, add color paste to adjust the color, and add defoaming agent after adjusting the color; S4: placing the carbon fiber woven fabric cut in S2 in a bag, and pouring the epoxy resin mixed in S3 into the bag, so that the epoxy resin is distributed on the surface of the carbon fiber woven fabric; S5: Let it stand to allow the epoxy resin to penetrate into the pores of the carbon fiber woven cloth; S6: Take out the carbon fiber woven cloth soaked with epoxy resin in S5 from the bag, and lay it flat on the lower mold of the carbon fiber sound cone molding mold; S7: Start the hot press machine and close the mold for hot pressing; S8: After hot pressing, the mold is cooled to room temperature to obtain the ultra-thin carbon fiber sound cone.

7. The preparation method according to claim 6, characterized in that: In step S2, the shaping treatment is to stick adhesive tape on four sides of the carbon fiber woven cloth to prevent the fiber bundles of the carbon fiber woven cloth from detaching and deforming.

8. The preparation method according to claim 6, characterized in that: The specific process described in step S4 is to lay the cut carbon fiber woven cloth in S2 flat in a ziplock bag, and pour the mixed epoxy resin in S3 into the ziplock bag so that the epoxy resin is distributed on the surface of the carbon fiber woven cloth, and roll back and forth with an aluminum alloy defoaming roller outside the ziplock bag to evenly distribute the epoxy resin on the surface of the carbon fiber woven cloth and eliminate bubbles.

9. The preparation method according to claim 6, characterized in that: In step S5, the standing time is 12-17 minutes.

10. The preparation method according to claim 6, characterized in that: In step S7, the hot pressing pressure is 0.1-0.5 MPa, the hot pressing temperature is 120-180° C., and the hot pressing time is 30-45 min.

11. An application of the ultra-thin carbon fiber cone according to any one of claims 1 to 5, characterized in that: The ultra-thin carbon fiber cone is used for preparing a loudspeaker.

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