Bamboo composite film and preparation method and application thereof

Abstract

The invention provides a bamboo composite membrane as well as a preparation method and application thereof, and relates to the technical field of vibrating diaphragm materials for loudspeakers. The bamboo composite film comprises a bamboo textile material and resin materials located on the upper surface and the lower surface of the bamboo textile material. The bamboo textile material comprises one or more of bamboo skin woven cloth and bamboo fiber woven cloth. The bamboo composite membrane provided by the invention has the advantages of low cost, easiness in processing, light weight and designable structure, and when the bamboo composite membrane provided by the invention is applied to the loudspeaker textile structure diaphragm, the energy loss in the vibration process can be effectively reduced, and the sound definition and fidelity can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of diaphragm materials for loudspeakers, and in particular to a bamboo composite membrane and a preparation method and application thereof. Background Art

[0002] Compared with non-textile structure diaphragms, textile structure diaphragms can use the diversity of fibers and the flexibility of textile processes to create complex and varied structures and performances to meet the different sound requirements and application scenarios of speakers. In addition, textile diaphragms are generally superior in sound conduction, frequency response and sound quality, and can provide a more natural, delicate and wide sound range.

[0003] Existing textile diaphragms are mainly made of carbon fiber, glass fiber, metal fiber, pulp, polyester fiber or fiber composite diaphragms, which have certain advantages in acoustic performance and physical properties. Carbon fiber, with its high strength, high rigidity and light weight, can significantly improve the response speed and stability of the diaphragm; glass fiber has excellent rigidity and deformation resistance, which helps to maintain the clarity and strength of sound transmission.

[0004] However, existing textile structure diaphragms also have certain problems. For example, the high density of carbon fiber and glass fiber materials makes the overall weight of the diaphragm heavy, which may affect the vibration efficiency; the fiber composite diaphragms made of pulp and polyester fibers often have problems with unnatural sound quality and insufficient fidelity during the sound restoration process; the textile structure diaphragms made of metal fibers may impose a burden on the environment during production and use, and resources are limited; fiber composite diaphragms, such as carbon fiber diaphragms, are relatively expensive, and glass fiber diaphragms have large mechanical wear, high processing energy consumption, are not easy to degrade, and are difficult to dispose of when discarded.

[0005] Therefore, existing speaker textile structure diaphragms have problems such as high material cost, great processing difficulty, and heavy weight that may affect vibration efficiency. Summary of the invention

[0006] In view of this, the object of the present invention is to provide a bamboo composite membrane and a preparation method and application thereof. The bamboo composite membrane provided by the present invention has the advantages of low cost, easy processing, light weight and designable structure. Applying the bamboo composite membrane provided by the present invention to the textile structure diaphragm of a speaker can effectively reduce the energy loss during the vibration process and improve the clarity and fidelity of the sound.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0008] The invention provides a bamboo composite film, comprising a bamboo textile material and a resin material located on the upper surface and the lower surface of the bamboo textile material; the bamboo textile material comprises one or more of bamboo strips woven cloth and bamboo fiber woven cloth.

[0009] Preferably, the resin material includes a thermoplastic resin.

[0010] Preferably, the thermoplastic resin includes one or more of PP, PET, PE, PLA, PBAT, PBS, PA and viscose fiber.

[0011] Preferably, the weaving angle between the bamboo strips of the bamboo strip woven cloth is 0-180°; the length of the bamboo strip woven cloth is not less than 100 mm, the width is 50-2500 mm, and the thickness is 1-50 mm.

[0012] Preferably, the inter-fiber weaving angle of the bamboo fiber woven cloth is 0-180°; the length of the bamboo fiber woven cloth is not less than 100 mm, the width is 50-2500 mm, and the thickness is 1-50 mm.

[0013] Preferably, the raw materials for preparing the bamboo fiber woven cloth include one or more of bundled bamboo fibers and continuous bamboo fibers; the diameter of the bundled bamboo fibers is 0.2-5 mm, and the diameter of the continuous bamboo fibers is 0.5-5 mm. The bundled bamboo fibers are tied or continuously wound with cotton thread to form continuous bamboo yarns. The continuous bamboo fibers are twisted and entangled by themselves to form continuous bamboo yarns.

[0014] Preferably, the raw materials for preparing the bundled bamboo fibers and the continuous bamboo fibers include bamboo fibers and auxiliary materials;

[0015] The auxiliary materials include one or more of inorganic non-metallic fibers and metal fibers.

[0016] The present invention provides a method for preparing the bamboo composite film described in the above technical solution, comprising the following steps:

[0017] A resin material is attached to the upper surface and the lower surface of a bamboo textile material to obtain a bamboo composite film; the bamboo textile material comprises one or more of bamboo strips woven cloth and bamboo fiber woven cloth.

[0018] Preferably, the attachment method includes dipping or hot pressing and melting.

[0019] The present invention provides application of the bamboo composite film described in the above technical solution or the bamboo composite film prepared by the preparation method described in the above technical solution in a diaphragm material for a loudspeaker.

[0020] The present invention provides a bamboo composite membrane, comprising a bamboo textile material and a resin material located on the upper surface and the lower surface of the bamboo textile material; the bamboo textile material comprises one or more of bamboo strips woven cloth and bamboo fiber woven cloth. In the present invention, the bamboo composite membrane has designability, and through different textile processes and structural designs, a rich vibration mode and frequency response characteristics can be achieved, thereby meeting the sound quality and timbre requirements in different application scenarios, and realizing a customizable sound quality experience; the low density characteristics of bamboo fiber help to reduce the overall weight of the diaphragm, improve vibration efficiency and sound response speed; bamboo fiber has good sound conduction performance and damping characteristics, can more effectively convert electrical signals into sound vibrations, reduce unnecessary vibration attenuation and resonance, thereby improving the fidelity and naturalness of sound quality; bamboo fiber is a natural renewable resource, and its production and use process has little impact on the environment, which helps to reduce dependence on traditional resources; compared with traditional fiber composite diaphragm materials such as carbon fiber and glass fiber, bamboo fiber diaphragm has the advantages of lower cost, less mechanical wear, lower processing energy consumption, and easy degradation and waste treatment, which reduces production costs and environmental pressure.

[0021] The present invention provides a method for preparing the bamboo composite membrane described in the above technical solution, comprising the following steps: attaching resin materials on the upper and lower surfaces of bamboo textile materials to obtain a bamboo composite membrane; the bamboo textile materials include one or more of bamboo strips woven cloth and bamboo fiber woven cloth. The present invention uses bamboo units (bamboo strips, bamboo yarns) as a matrix, resins, especially thermoplastic resins (PP, PET, PE, PLA, PBAT, PBS, PA, viscose fiber) systems as adhesives, preferably adding inorganic non-metallic fibers (carbon fibers, glass fibers) and metal fibers as auxiliary materials, and using knitting, weaving, and braiding processes to prepare bamboo composite membranes in two-dimensional and three-dimensional directions. In a specific embodiment of the present invention, bamboo units woven with different aspect ratios and appropriate process parameters (temperature, pressure, time, etc.) are used to adjust the sound quality of the bamboo composite membrane to achieve the requirements of good rigidity (high specific curvature), low density, low frequency, high elasticity, and appropriate internal damping of the diaphragm performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the preparation process of bamboo strips woven cloth;

[0023] Figure 2 Schematic diagram of the preparation process of bamboo fiber woven cloth. DETAILED DESCRIPTION

[0024] The invention provides a bamboo composite film, comprising a bamboo textile material and a resin material located on the upper surface and the lower surface of the bamboo textile material; the bamboo textile material comprises one or more of bamboo strips woven cloth and bamboo fiber woven cloth.

[0025] Unless otherwise specified, the materials and equipment used in the present invention are all commercially available products in the art.

[0026] The bamboo composite membrane provided by the present invention includes bamboo textile materials. In the present invention, the bamboo unit, as a natural material with abundant resources, has the characteristics of fast growth rate and strong regeneration ability. Bamboo fiber has excellent strength and toughness, light weight and low density, which is conducive to improving the vibration efficiency and response speed of the diaphragm. Therefore, applying the bamboo unit to the textile structure diaphragm of the speaker can effectively reduce the energy loss in the vibration process, improve the clarity and fidelity of the sound, and conform to the trend of sustainable development.

[0027] In the present invention, the bamboo textile material includes one or more of bamboo strips woven cloth and bamboo fiber woven cloth.

[0028] In the present invention, the weaving angle between the bamboo strips of the bamboo strip woven cloth is preferably 0-180°; the length of the bamboo strip woven cloth is not less than 100 mm, 100-2000 mm in the embodiment, the width is preferably 50-2500 mm, and the thickness is preferably 1-50 mm. In the present invention, the bamboo strip woven cloth is preferably a two-dimensional woven cloth or a three-dimensional woven cloth.

[0029] In a specific embodiment of the present invention, the raw material for preparing the bamboo strip woven cloth is strip bamboo strips. In the present invention, the bamboo strip woven cloth is preferably obtained by weaving strip bamboo strips in two orthogonal directions in the vertical and horizontal directions. In a specific embodiment of the present invention, the preparation method of the strip bamboo strips is referred to CN110587740A, which specifically includes: the bamboo strips are thin slices obtained by splitting bamboo after peeling, with a thickness of 0.01 to 5 mm, a length of ≥50 mm, and a width of 1 to 20 mm; the bamboo strips can be continuous length bamboo strips (see CN110587740A), firstly, bamboo strips with smooth surfaces on both sides are prepared, and then the bamboo strips are sent to the bamboo strip splitting equipment for splitting to obtain bamboo strip slices. ; The bamboo strips are continuously extended by overlapping and gluing, and then the bamboo strips at the overlapping and gluing places are pressed, and after the glue at the overlapping and gluing places are dried, the overlapping and gluing bamboo strips are thinned to make their thickness the same as that of the bamboo strips, and finally a continuous strip of bamboo strips with uniform thickness is obtained; the glue used in the overlapping and gluing is a thermosetting glue or a quick-drying glue, and the thermosetting glue is a thermosetting glue mainly composed of AB type epoxy glue; the quick-drying glue is a quick-drying glue mainly composed of UV epoxy glue.

[0030] Alternatively, in a specific embodiment of the present invention, the raw materials for preparing the bamboo strips woven cloth are strips of bamboo strips and a first auxiliary material, and the first auxiliary material preferably includes one or more of inorganic non-metallic fibers and metal fibers. In the present invention, the inorganic non-metallic fibers preferably include one or more of carbon fibers and glass fibers. In the present invention, the diameter of the inorganic non-metallic fibers is preferably 0.2 to 0.5 mm, and in a specific embodiment, the diameter of the inorganic non-metallic fibers can be 0.2 to 0.5 mm. In the present invention, the diameter of the metal fibers is preferably 0.2 to 0.5 mm, and in a specific embodiment, the diameter of the metal fibers can be 0.2 to 0.5 mm. In the present invention, the bamboo strips woven cloth is preferably obtained by weaving strips of bamboo strips and auxiliary materials together in a vertical and horizontal orthogonal bidirectional manner. Alternatively, in the present invention, the first auxiliary material is preferably pre-wound on the strips of bamboo strips, and then the strips of bamboo strips wrapped with the first auxiliary material are woven in a vertical and horizontal orthogonal bidirectional manner to obtain the bamboo strips woven cloth.

[0031] In the present invention, the inter-fiber weaving angle of the bamboo fiber woven cloth is preferably 0-180°; the length of the bamboo fiber woven cloth is not less than 100 mm, 100-2000 mm in the embodiment, the width is preferably 50-2500 mm, and the thickness is preferably 1-50 mm. In the present invention, the bamboo fiber woven cloth is preferably a two-dimensional woven cloth or a three-dimensional woven cloth. The raw materials for preparing the bamboo fiber woven cloth include one or more of bundled bamboo fibers and continuous bamboo fibers. In a specific embodiment of the present invention, the bundled bamboo fibers are tied into continuous bamboo yarns by knotting or continuously winding with cotton thread. The continuous bamboo fibers are twisted and embraced by themselves to form continuous bamboo yarns. The continuous bamboo fibers are woven in two orthogonal directions in the vertical and horizontal directions to obtain bamboo fiber woven cloth.

[0032] In a specific embodiment of the present invention, the three-dimensional weaving process used in the three-dimensional woven fabric is to guide and interweave the fibers along the three directions of x, y, and z on a weaving machine through multiple weaving heads to obtain the three-dimensional woven fabric. In the present invention, complex vibration modes and frequency response characteristics are achieved through two-dimensional and three-dimensional structural design, so that the bamboo composite membrane can be designed and adjusted according to different acoustic requirements and application scenarios.

[0033] In the present invention, the raw materials for preparing the bamboo fiber woven cloth preferably include one or more of bundled bamboo fibers and continuous bamboo fibers. In the present invention, the diameter of the bundled bamboo fibers is preferably 0.2-5 mm, and in a specific embodiment, the diameter of the bundled bamboo fibers can be 0.5-3 mm. In the present invention, the diameter of the continuous bamboo fibers is preferably 0.5-5 mm, and in a specific embodiment, the diameter of the continuous bamboo fibers can be 1.0-3 mm. The present invention has no requirements on the length of the bundled bamboo fibers and the continuous bamboo fibers.

[0034] In the present invention, the raw materials for preparing the bundled bamboo fiber and the continuous bamboo fiber preferably include bamboo fiber and auxiliary materials (hereinafter referred to as the second auxiliary materials); the second auxiliary materials preferably include one or more of inorganic non-metallic fibers and metal fibers. In the present invention, the inorganic non-metallic fibers preferably include one or more of carbon fibers and glass fibers. In the present invention, the length of the bamboo fiber is preferably 5 to 150 mm, and the diameter is preferably 0.01 to 1.20 mm. In a specific embodiment, the length of the bamboo fiber can be 50 to 150 mm, and the diameter can be 0.5 to 1.20 mm. In the present invention, the diameter of the inorganic non-metallic fiber is preferably 0.2 to 0.5 mm. In a specific embodiment, the diameter of the inorganic non-metallic fiber can be 0.2 to 0.5 mm. In the present invention, the diameter of the metal fiber is preferably 0.2 to 0.5 mm. In a specific embodiment, the diameter of the metal fiber can be 0.2 to 0.5 mm.

[0035] In a specific embodiment of the present invention, the raw materials for preparing the bundled bamboo fibers and the continuous bamboo fibers independently include bamboo fibers, a combination of bamboo fibers and glass fibers, a combination of bamboo fibers and metal fibers, a combination of bamboo fibers and carbon fibers, and a combination of bamboo fibers, glass fibers and carbon fibers. In the present invention, by compounding bamboo fibers with materials such as glass fibers and metal fibers, not only the rigidity and stability of the diaphragm are enhanced, but also the efficiency of sound conduction and the sound quality performance are optimized through the complementary advantages of different material properties, so that the diaphragm can adapt to a wider range of sound.

[0036] In a specific embodiment of the present invention, the diameter of the continuous bamboo fiber is 1.5-5 mm, and the preparation method of the continuous bamboo fiber is referred to CN112878074A. The continuous bamboo fiber raw material is pretreated in sequence: soaking in water for 1h-24h, mechanical rolling, fiber opening, splicing and twisting, and drying at a temperature of 100°C to obtain the continuous bamboo fiber.

[0037] The bamboo composite film provided by the present invention comprises resin materials located on the upper surface and the lower surface of the bamboo textile material. In the present invention, the resin material preferably comprises a thermoplastic resin. In the present invention, the thermoplastic resin preferably comprises one or more of PP, PET, PE, PLA, PBAT, PBS, PA and viscose fiber. In a specific embodiment of the present invention, the surface of the bamboo textile material is coated with resin materials.

[0038] In a specific embodiment of the present invention, the density of the bamboo composite film is 0.6-1.1 g / cm 3 , creep modulus is 1000~1300MPa, and Young's modulus is 10.8~17.4GPa.

[0039] The present invention provides a method for preparing the bamboo composite film described in the above technical solution, comprising the following steps:

[0040] A resin material is attached to the upper surface and the lower surface of a bamboo textile material to obtain a bamboo composite film; the bamboo textile material comprises one or more of bamboo strips woven cloth and bamboo fiber woven cloth.

[0041] In the present invention, the composition and preparation method of the bamboo textile material are consistent with those described above and will not be described in detail here.

[0042] In the present invention, the attachment method preferably includes impregnation or hot pressing and melting. In the present invention, when the attachment method is impregnation, the bamboo textile material is preferably immersed in the resin system, and the prepreg process is carried out to obtain a prepreg; then the prepreg is pressed to obtain a bamboo composite film. In the present invention, the resin system is preferably a solid resin. In the present invention, the solid resin preferably includes a thermoplastic resin; the thermoplastic resin preferably includes one or more of PP, PET, PE, PLA, PBAT, PBS, PA and viscose fiber. In the present invention, the pressing treatment preferably includes hot pressing and cold pressing in sequence; the temperature of the hot pressing is preferably 130-200°C; the pressure of the hot pressing is preferably 0.5-5Mpa; the time of the hot pressing is preferably 1-30min; the temperature of the cold pressing is preferably 25°C±2°C; the pressure of the cold pressing is preferably 0.5-5Mpa; the time of the cold pressing is preferably 1-30min.

[0043] In the present invention, when the attachment method is hot pressing and melting, resin films are placed on the upper surface and the lower surface of the bamboo textile material respectively, and hot pressing and melting are performed to obtain a bamboo composite film. In the present invention, the thickness of the resin film is preferably 0.1 to 1 mm. In the present invention, the resin used in the resin film preferably includes a thermoplastic resin; the thermoplastic resin preferably includes one or more of PP, PET, PE, PLA, PBAT, PBS, PA and viscose fiber. In the present invention, the temperature of the hot pressing and melting is preferably 130 to 200°C; the pressure of the hot pressing and melting is preferably 0.5 to 5Mpa; the time of the hot pressing and melting is preferably 1 to 30 minutes.

[0044] The present invention provides application of the bamboo composite film described in the above technical solution or the bamboo composite film prepared by the preparation method described in the above technical solution in a diaphragm material for a loudspeaker.

[0045] The bamboo composite film provided by the present invention is applied to the diaphragm material for a loudspeaker, which can reduce the distortion of the diaphragm and improve the sound quality of the diaphragm.

[0046] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] Example 1

[0048] Firstly, bamboo strips with smooth surfaces on both sides are prepared, and then the bamboo strips are sent to a bamboo strip splitting device for splitting to obtain bamboo strips (1-2 mm thick, 100-300 mm long, and 10 mm wide), and the bamboo strips are continuously extended by overlapping and gluing (adopting thermosetting glue AB type epoxy glue for gluing), and then the bamboo strips at the overlapping and gluing locations are pressed, and after the glue liquid at the overlapping and gluing locations is dried, the overlapping and gluing bamboo strips are thinned to make their thickness the same as that of the bamboo strips, and finally a continuous strip of bamboo strips with the same width and uniform thickness is obtained; The strip-shaped bamboo strips are two-dimensionally woven at an aspect ratio of 1:1 and angles (0° and 90°) to obtain bamboo strip woven cloth; the bamboo strip woven cloth is cut into a required shape, immersed in PP resin (pure PP resin is heated and melted to form a solution) (160°C, 3 minutes), and subjected to a pre-impregnation process, and then hot-pressed and cold-pressed (hot-pressed at 160°C, 15MPa, 5 minutes, cold-pressed at 30°C, 15MPa, 5 minutes, hot-pressed to fuse the resin with the bamboo material, and cold-pressed to shape the material) in sequence to be processed into the required shape of the diaphragm.

[0049] The composite diaphragm prepared by the above method has a density of 0.6 g / cm 3 , the creep modulus is 1000MPa, and the Young's modulus is 15.8GPa. The obtained composite diaphragm has the characteristics of high creep modulus, high stiffness, small elastic deformation and light weight.

[0050] Example 2

[0051] The bamboo fiber raw material is pretreated in sequence: soaked in water for 10 hours, mechanically rolled, fiber loosened, spliced ​​and twisted, and then dried at a temperature of 100°C to obtain a continuous bamboo fiber yarn with a diameter of 2.0 to 2.5 mm; the continuous bamboo fiber yarn is woven into (2 strands) of bundled fibers, and the continuous bamboo fiber yarn is alternately wound on the outside of the bundled fibers; the bundled fibers after winding are woven in two orthogonal directions in the vertical and horizontal directions to obtain a mesh, wherein the weaving angle between the fibers is 90°; the obtained bamboo fiber woven cloth is cut into a required shape, immersed in PE resin (pure PE resin is heated and melted to form a solution) (170°C, 2min), subjected to a pre-impregnation process, and then hot pressed and cold pressed (hot pressed at 170°C, 10MPa, 5min, cold pressed at 30°C, 10MPa, 3min) in sequence to be processed into the required shape of the diaphragm.

[0052] The composite diaphragm prepared by the above method has a density of 0.8g / cm 3 , the creep modulus is 1200MPa, and the Young's modulus is 10.8GPa. The obtained composite diaphragm has the characteristics of high creep modulus, high stiffness, small elastic deformation and light weight.

[0053] Example 3

[0054] The bamboo fiber raw material is pretreated in sequence: soaked in water for 10 hours, mechanically rolled, fiber loosened, spliced ​​and twisted, and then dried at a temperature of 100°C to obtain a continuous bamboo fiber yarn with a diameter of 2.0-2.5 mm; the continuous bamboo fiber yarn, glass fiber yarn (with a diameter of 0.2-0.4 mm), and metal fiber (with a diameter of 0.2-0.4 mm) are woven into (4 strands) of bundled fibers, and the bundled fibers are woven in two orthogonal directions in the vertical and horizontal directions to obtain a mesh, wherein the weaving angle between the fibers is 90°; the obtained bamboo fiber woven cloth is cut into a required shape, immersed in PE resin (pure PE resin is heated and melted to form a solution) (170°C, 2min), subjected to a pre-impregnation process, and then hot pressed and cold pressed (hot pressed at 170°C, 10MPa, 5min, cold pressed at 30°C, 10MPa, 3min) in sequence to be processed into the required shape of the diaphragm.

[0055] The composite diaphragm prepared by the above method has a density of 0.9 g / cm 3 , the creep modulus is 1100MPa, and the Young's modulus is 11.9GPa. The obtained composite diaphragm has the characteristics of high creep modulus, high stiffness, small elastic deformation and light weight.

[0056] Example 4

[0057] The bamboo fiber raw material is pretreated in sequence: soaked in water for 12 hours, mechanically rolled, fiber loosened and spliced, carbon fiber twisted, and dried at a temperature of 100°C to obtain continuous bamboo fiber / carbon fiber (the carbon fiber does not need to be pretreated, but only needs to be twisted together with the bundled bamboo fiber) yarn with a diameter of 1.5 to 2.0 mm; the bamboo fiber / carbon fiber is woven into (6 strands) of bundled fibers, and the bundled fibers are guided and interwoven along the x, y, and z directions on a braiding machine through multiple braiding heads to form the desired three-dimensional braided sound basin structure; a layer of 0.2 mm thick PP film is attached to the top and bottom of the three-dimensional braided sound basin, and then processed into a sound basin diaphragm through a hot pressing process (180°C, 10MPa, 5min).

[0058] The composite diaphragm prepared by the above method has a density of 1.1 g / cm 3 , the creep modulus is 1300MPa, and the Young's modulus is 17.4GPa. The obtained composite diaphragm has the characteristics of high creep modulus, high stiffness, small elastic deformation and light weight.

[0059] The present invention uses different bamboo units and thermoplastic resins, and by changing the bamboo units woven with different aspect ratios and matching appropriate process parameters, the sound quality of the bamboo fiber woven diaphragm is adjusted to achieve the diaphragm performance requirements of good rigidity (high specific curvature), low density, appropriate internal damping and high elastic Young's modulus, and fast sound speed, thereby realizing its high value-added application in the field of loudspeaker diaphragms. The present invention can not only meet consumers' demand for high-quality and diversified sound quality, but also promote the green development of the loudspeaker industry, and has important theoretical significance and application value. The present invention aims to overcome the limitations of the prior art, and proposes an innovative bamboo unit textile structure diaphragm for loudspeakers and a preparation method thereof, so as to achieve performance optimization and environmental protection upgrades of loudspeaker diaphragm materials.

[0060] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A bamboo composite film, comprising a bamboo textile material and a resin material located on the upper surface and the lower surface of the bamboo textile material; the bamboo textile material comprises one or more of a bamboo strip woven cloth and a bamboo fiber woven cloth.

2. The bamboo composite membrane according to claim 1, characterized in that: The resin material includes a thermoplastic resin.

3. The bamboo composite membrane according to claim 1 or 2, characterized in that: The thermoplastic resin includes one or more of PP, PET, PE, PLA, PBAT, PBS, PA and viscose fiber.

4. The bamboo composite membrane according to claim 1, characterized in that: The weaving angle between the bamboo strips of the bamboo strip woven cloth is 0-180 degrees; the length of the bamboo strip woven cloth is not less than 100 mm, the width is 50-2500 mm, and the thickness is 1-50 mm.

5. The bamboo composite membrane according to claim 1, characterized in that: The inter-fiber weaving angle of the bamboo fiber woven cloth is 0-180°; the length of the bamboo fiber woven cloth is not less than 100 mm, the width is 50-2500 mm, and the thickness is 1-50 mm.

6. The bamboo composite membrane according to claim 1 or 5, characterized in that: The raw materials for preparing the bamboo fiber woven cloth include one or more of bundled bamboo fibers and continuous bamboo fibers; The diameter of the bundled bamboo fibers is 0.2-5 mm, and the diameter of the continuous bamboo fibers is 0.5-5 mm.

7. The bamboo composite membrane according to claim 6, characterized in that: The raw materials for preparing the bundled bamboo fibers and the continuous bamboo fibers include bamboo fibers and auxiliary materials; The auxiliary materials include one or more of inorganic non-metallic fibers and metal fibers.

8. The method for preparing the bamboo composite film according to any one of claims 1 to 7, comprising the following steps: A resin material is attached to the upper surface and the lower surface of a bamboo textile material to obtain a bamboo composite film; the bamboo textile material comprises one or more of bamboo strips woven cloth and bamboo fiber woven cloth.

9. The preparation method according to claim 8, characterized in that: The attachment method includes dipping or hot pressing and melting.

10. Use of the bamboo composite film according to any one of claims 1 to 7 or the bamboo composite film prepared by the preparation method according to any one of claims 8 to 9 in a diaphragm material for a loudspeaker.

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