CN117177145A - Composite cone and preparation method and application thereof - Google Patents
Composite cone and preparation method and application thereof Download PDFInfo
- Publication number
- CN117177145A CN117177145A CN202311252544.2A CN202311252544A CN117177145A CN 117177145 A CN117177145 A CN 117177145A CN 202311252544 A CN202311252544 A CN 202311252544A CN 117177145 A CN117177145 A CN 117177145A
- Authority
- CN
- China
- Prior art keywords
- cone
- blank
- composite
- aramid fiber
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002131 composite material Substances 0.000 title claims abstract description 92
- 238000002360 preparation method Methods 0.000 title claims abstract description 44
- 229920006231 aramid fiber Polymers 0.000 claims abstract description 85
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 78
- 239000004917 carbon fiber Substances 0.000 claims abstract description 78
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 66
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000003822 epoxy resin Substances 0.000 claims abstract description 50
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 50
- 238000007731 hot pressing Methods 0.000 claims abstract description 32
- 229920006335 epoxy glue Polymers 0.000 claims abstract description 29
- 238000004537 pulping Methods 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 32
- 238000000034 method Methods 0.000 claims description 25
- 239000002904 solvent Substances 0.000 claims description 19
- 238000010521 absorption reaction Methods 0.000 claims description 17
- 239000002202 Polyethylene glycol Substances 0.000 claims description 12
- 238000010009 beating Methods 0.000 claims description 12
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 claims description 12
- 229920001223 polyethylene glycol Polymers 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 10
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 9
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 9
- 239000002270 dispersing agent Substances 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 9
- 210000001161 mammalian embryo Anatomy 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 9
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 claims description 6
- 238000007865 diluting Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000004080 punching Methods 0.000 claims description 5
- 239000004593 Epoxy Substances 0.000 claims description 4
- 238000007654 immersion Methods 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 150000001412 amines Chemical class 0.000 claims description 3
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 3
- 150000002576 ketones Chemical class 0.000 claims description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 3
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 5
- 230000004044 response Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 20
- 239000000835 fiber Substances 0.000 description 19
- 239000000243 solution Substances 0.000 description 15
- 239000004760 aramid Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 10
- -1 polypropylene Polymers 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 230000002195 synergetic effect Effects 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- HFBHOAHFRNLZGN-LURJTMIESA-N (2s)-2-formamido-4-methylpentanoic acid Chemical compound CC(C)C[C@@H](C(O)=O)NC=O HFBHOAHFRNLZGN-LURJTMIESA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000012466 permeate Substances 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- FYGHSUNMUKGBRK-UHFFFAOYSA-N 1,2,3-trimethylbenzene Chemical compound CC1=CC=CC(C)=C1C FYGHSUNMUKGBRK-UHFFFAOYSA-N 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- 229920001410 Microfiber Polymers 0.000 description 2
- QLBRROYTTDFLDX-UHFFFAOYSA-N [3-(aminomethyl)cyclohexyl]methanamine Chemical compound NCC1CCCC(CN)C1 QLBRROYTTDFLDX-UHFFFAOYSA-N 0.000 description 2
- 229920003235 aromatic polyamide Polymers 0.000 description 2
- 235000005770 birds nest Nutrition 0.000 description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
- PXKLMJQFEQBVLD-UHFFFAOYSA-N bisphenol F Chemical compound C1=CC(O)=CC=C1CC1=CC=C(O)C=C1 PXKLMJQFEQBVLD-UHFFFAOYSA-N 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000003658 microfiber Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229920001909 styrene-acrylic polymer Polymers 0.000 description 2
- 235000005765 wild carrot Nutrition 0.000 description 2
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 235000010599 Verbascum thapsus Nutrition 0.000 description 1
- 244000178289 Verbascum thapsus Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000003849 aromatic solvent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011365 complex material Substances 0.000 description 1
- 239000012792 core layer Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- GEQHKFFSPGPGLN-UHFFFAOYSA-N cyclohexane-1,3-diamine Chemical compound NC1CCCC(N)C1 GEQHKFFSPGPGLN-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229920006332 epoxy adhesive Polymers 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 210000001724 microfibril Anatomy 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000004584 weight gain Effects 0.000 description 1
- 235000019786 weight gain Nutrition 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Abstract
The invention provides a composite cone, a preparation method and application thereof, wherein the preparation method comprises the following steps: dispersing aramid fiber in water for pulping to obtain a component A; the component A and the carbon fiber are uniformly mixed to obtain a component B; performing first hot pressing on the cone wet blank to obtain a first cone blank; immersing the first cone blank in epoxy glue solution and drying to obtain a second cone blank; and performing second hot pressing on the second cone blank to obtain the composite cone. Through the design and the cooperation of the carbon fiber, the aramid fiber and the epoxy resin and the combination of the special preparation technology, the composite cone has high strength and excellent waterproof and moistureproof performances. Meanwhile, the preparation method can prepare the composite cone with higher taper and complex shape, is applied to the loudspeaker, can expand the frequency response range of the loudspeaker, improves the weather resistance of the loudspeaker, and greatly enriches the application range of the loudspeaker.
Description
Technical Field
The invention belongs to the technical field of speakers, and particularly relates to a composite cone and a preparation method and application thereof.
Background
The cone is an important component of the sound unit in the loudspeaker, whose main function is to provide an accurate frequency response. The cone can be divided into a cone, a metal cone, a ceramic cone, a PP cone and a composite cone according to the materials, wherein the cone has the characteristics of natural tone, low cost, good processability and the like, and has very wide application. The main raw material of the cone is plant fiber, so that natural hydrophilicity is endowed to the cone, the waterproof performance of the cone is poor, after the cone absorbs water and is wetted, on one hand, the mechanical property of the cone is greatly reduced, and on the other hand, the cone is heavier, so that the acoustic characteristics of the loudspeaker are also changed; after the cone is dried and wet for many times, the cone may be fatigued, and even irreversibly deformed and damaged.
In order to expand the application of the loudspeaker products in the fields of outdoors, underwater, ships, water motorcycles and the like, the loudspeaker cone is required to have complete waterproof and moistureproof performances, and the means commonly used in the industry at present are as follows:
(1) The cone made of PP (polypropylene) has good waterproof and moistureproof performances, and can meet the application of loudspeaker products in a humid environment; however, PP is not sufficiently rigid and is not suitable for tweeters or full-range speakers.
(2) The most common metal basin is an aluminum basin using a metal basin. After the aluminum basin is subjected to surface treatment, the application of the loudspeaker product in a humid environment can be satisfied; however, aluminum basins are expensive, and because of the limitation of the expansion rate of aluminum sheets, sound basins with large taper and complex shape cannot be formed.
(3) The cone is subjected to waterproof and moistureproof treatment, for example, CN110636418A discloses a loudspeaker cone, and a preparation method and application thereof, wherein the preparation raw materials of the loudspeaker cone comprise paper pulp, cationic styrene-acrylic emulsion and emulsified paraffin; the cationic styrene-acrylic emulsion and the emulsified paraffin are mutually cooperated, so that the paper cone is endowed with excellent waterproof and moistureproof performances. Although the cone obtained by the method has obviously improved waterproof and moistureproof performances compared with the common cone, the cone can meet the application of the loudspeaker in a humid environment and an environment with short-time water contact. However, this cone still has a water absorption of 4.72% and is limited in use in more severe environments.
(4) The method comprises the steps of taking carbon fiber woven cloth as a raw material, soaking epoxy resin, and hot-pressing to form the loudspeaker cone. For example, CN115895191a discloses a preparation method of a carbon fiber cone, which comprises the following components in parts 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 part of defoaming agent. The carbon fiber cone has the advantages of thin thickness, high strength, good moisture resistance and good environmental stability. However, the carbon fiber woven cloth has low extensibility, the cone with larger taper and complex shape can not be molded and prepared, and the cone has insufficient waterproof and moistureproof performances.
Therefore, development of a cone which has good waterproof and moistureproof performances and high strength and can be suitable for high taper and complex shape in various application scenes is a problem to be solved in the field.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a composite cone and a preparation method and application thereof, and the obtained composite cone has high strength and excellent waterproof and moistureproof performances through the design and cooperation of carbon fiber, aramid fiber and epoxy resin and the combination of the carbon fiber, the aramid fiber and the epoxy resin with a specific preparation method; meanwhile, the preparation method can prepare the composite cone with higher taper and complex shape. When the composite cone is applied to a loudspeaker, the frequency response range of the loudspeaker can be expanded, the weather resistance of the loudspeaker is improved, and the application range of the loudspeaker is expanded.
To achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a method for preparing a composite cone, the method comprising:
dispersing aramid fiber in water for pulping to obtain a component A;
the component A and the carbon fiber are uniformly mixed to obtain a component B;
providing an epoxy glue solution, wherein the epoxy glue solution comprises a combination of epoxy resin, a curing agent and a solvent;
filtering the component B to obtain a cone wet blank;
performing first hot pressing on the cone wet blank to obtain a first cone blank;
immersing the first cone blank in epoxy glue solution and drying to obtain a second cone blank;
and performing second hot pressing on the second cone blank to obtain the composite cone.
The invention adopts aramid fiber, carbon fiber and epoxy resin as preparation raw materials. According to the invention, the carbon fiber and the aramid fiber have the advantages of high strength and high modulus, the surface of the fiber is smooth, no active functional group exists, so that the carbon fiber and the aramid fiber have no hydrogen bond effect, and are difficult to intertwine to generate interweaving force; if the carbon fiber and the aramid fiber are not treated, the bonding force of the cone formed by mixing the carbon fiber and the aramid fiber is weaker, the inner structure of the cone is loose, and even the cone cannot be formed. Based on the method, the aramid fiber is not directly added, but is pulped, so that the length of the treated aramid fiber is unchanged, a large number of plush-shaped microfibers exist on the surface of a fiber trunk, the degree of fiber splitting and brooming is obviously improved, the interweaving point and binding force of the aramid fiber and the carbon fiber are effectively improved, and a cone structure taking the carbon fiber as a supporting fiber and the aramid fiber as a winding fiber is constructed.
The preparation method comprises a two-time hot pressing process, wherein the first hot pressing process is used for dehydrating and forming the wet cone blank to obtain a first cone blank which is larger in fiber gaps, loose in structure and similar to a bird nest structure; the first cone blank is immersed in epoxy glue solution, the epoxy glue is immersed in the first cone blank, so that the epoxy glue fully infiltrates into the cone blank and remains in the first cone blank, and the first cone blank is adhered to interweaving sites of carbon fibers and aramid fibers; performing second hot pressing to solidify the epoxy glue, tightly combining the carbon fiber and the aramid fiber, reducing the porosity of the cone, and shaping a second cone blank to obtain the composite cone; in the second hot pressing, on one hand, the epoxy glue plays a role in bonding between the carbon fiber and the aramid fiber, and on the other hand, the strength of the cured epoxy glue is improved, so that the rigidity and strength of the composite cone are further improved.
According to the invention, through the design and synergistic effect of the carbon fiber, the aramid fiber and the epoxy resin and the combination of the specific preparation process, the advantages of high strength and high modulus of the carbon fiber and the aramid fiber are effectively exerted, and the carbon fiber and the aramid fiber have excellent interweaving force and high binding force, so that the composite cone has high strength and excellent waterproof and moistureproof performances. Meanwhile, the preparation method of the composite cone provided by the invention is that carbon fibers and beaten aramid fibers are dispersed in water, and the composite cone with higher taper and complex shape can be prepared by filtering and wet forming through a die and a filter screen. When the composite cone is applied to a loudspeaker, the frequency response range of the loudspeaker can be expanded, the weather resistance of the loudspeaker is improved, the application of the loudspeaker product in the fields of outdoors, underwater, ships, water motorcycles and the like is expanded, and the application range of the loudspeaker is greatly widened.
The following is a preferred technical scheme of the present invention, but not a limitation of the technical scheme provided by the present invention, and the following preferred technical scheme can better achieve and achieve the objects and advantages of the present invention.
Preferably, the preparation raw materials in the preparation method comprise the following components in parts by mass:
specifically, the mass part of the aramid fiber is 85-95 parts, for example, 86 parts, 87 parts, 88 parts, 89 parts, 90 parts, 91 parts, 92 parts, 93 parts or 94 parts, and specific point values among the above point values, which are limited in space and for the sake of brevity, the present invention does not exhaustively list the specific point values included in the range.
The mass parts of the carbon fiber are 5-15 parts, for example, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts or 14 parts, and specific point values among the above point values are limited in space and for the sake of brevity, the present invention does not exhaustively list specific point values included in the range.
The epoxy resin is 3-5 parts by mass, for example, 3.2 parts, 3.5 parts, 3.8 parts, 4 parts, 4.2 parts, 4.5 parts or 4.8 parts, and specific point values among the above point values, are limited in space and for the sake of brevity, the present invention is not exhaustive of the specific point values included in the range.
The mass part of the curing agent is 0.6-2.5 parts, for example, 0.8 parts, 1 part, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.2 parts or 2.4 parts, and specific point values among the above point values, which are limited in space and for brevity, the present invention is not exhaustive list of specific point values included in the range, and more preferably 0.9-1.5 parts.
As the preferable technical scheme of the invention, the carbon fiber, the aramid fiber and the epoxy resin are synergistic and have complementary performances according to specific dosage, so that the advantages of high strength and high modulus of the carbon fiber and the aramid fiber are effectively exerted, and the direct binding force and the binding force of the carbon fiber and the aramid fiber are improved.
Preferably, the aramid fibers have an average length of 5.5-6.5mm, for example, 5.6mm, 5.7mm, 5.8mm, 5.9mm, 6mm, 6.1mm, 6.2mm, 6.3mm or 6.4mm, and specific point values between the above point values, are limited in length and for brevity, the invention is not exhaustive of the specific point values included in the ranges.
Preferably, the tensile strength of the aramid fiber is 2500-3500MPa, for example, 2600MPa, 2800MPa, 3000MPa, 3100MPa, 3200MPa, 3300MPa or 3400MPa, and specific point values between the above point values, which are limited in space and for brevity, the present invention is not exhaustive.
Preferably, the elastic modulus of the aramid fiber is 100-150GPa, for example, 105GPa, 110GPa, 115GPa, 120GPa, 125GPa, 130GPa, 135GPa, 140GPa or 145GPa, and specific point values between the above point values, which are limited in space and for the sake of brevity, the present invention does not exhaustively list the specific point values included in the range.
Preferably, the elongation at break of the aramid fiber is 2.0% -3.0%, for example, may be 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, and specific point values between the above point values, limited in length and for brevity, the invention is not exhaustive of the specific point values included in the range.
Preferably, the density of the aramid fiber is 1.38-1.45g/cm 3 For example, it may be 1.39g/cm 3 、1.4g/cm 3 、1.41g/cm 3 、1.42g/cm 3 、1.43g/cm 3 Or 1.44g/cm 3 And the particular values between the above-mentioned values, are limited in space and for brevity, the invention is not intended to exhaustively enumerate the specific values included in the range.
As a preferable technical scheme of the invention, the tensile strength of the aramid fiber is 2815MPa, the elastic modulus is 126GPa, the elongation at break is 2.5%, and the density is 1.44g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the Compared with the aramid fiber and the carbon fiber, the carbon fiber has better mechanical property, and the aramid fiber has larger extensibility and smaller density than the carbon fiber.
Preferably, the carbon fibers have an average length of 4-7mm, for example, 4.2mm, 4.5mm, 4.8mm, 5mm, 5.2mm, 5.5mm, 5.8mm, 6mm, 6.2mm, 6.5mm or 6.8mm, and specific point values between the above point values, are limited in length and for brevity, the present invention is not exhaustive of the specific point values included in the range.
Preferably, the tensile strength of the carbon fiber is 2500-4500MPa, for example 2800MPa, 3000MPa, 3500MPa, 3800MPa, 4000MPa, 4200MPa or 4400MPa, and specific point values between the above point values, which are limited in space and for brevity, the present invention is not exhaustive.
Preferably, the elastic modulus of the carbon fiber is 200-300GPa, for example, 210GPa, 220GPa, 230GPa, 240GPa, 250GPa, 260GPa, 270GPa, 280GPa or 290GPa, and specific point values between the above point values, which are limited in space and for the sake of brevity, the present invention does not exhaustively list the specific point values included in the range.
Preferably, the carbon fiber has an elongation at break of 1.3% -1.9%, for example, 1.4%, 1.5%, 1.6%, 1.7% or 1.8%, and specific point values between the above point values, are limited in length and for simplicity, the present invention is not exhaustive of the specific point values included in the range.
Preferably, the carbon fibers have a density of 1.5-2.0g/cm 3 For example, it may be 1.55g/cm 3 、1.6g/cm 3 、1.7g/cm 3 、1.8g/cm 3 Or 1.9g/cm 3 And the particular values between the above-mentioned values, are limited in space and for brevity, the invention is not intended to exhaustively enumerate the specific values included in the range.
As a preferable technical scheme of the invention, the carbon fiber has the tensile strength of 3000MPa, the elastic modulus of 225GPa, the elongation at break of 1.7 percent and the density of 1.7g/cm 3 The composite cone has the average length of 4-7mm, has high strength and high modulus, and can effectively play a role in improving the strength and modulus of the composite cone when being used as supporting fiber.
Preferably, the epoxy resin comprises an epoxy laminate resin.
Preferably, the curing agent comprises an amine curing agent and/or a phenolic curing agent.
Preferably, the amine curing agent comprises any one or a combination of at least two of 1, 3-cyclohexanedimethylamine, ethylene glycol bis (3-aminopropyl) ether and polyetheramine (alpha- (2-aminomethylethyl) -omega- (2-aminomethylethoxy) polyethylene glycol).
Preferably, the phenolic curing agent comprises bisphenol a and/or bisphenol F, further preferably bisphenol a.
Preferably, the curing agent comprises a combination of 1, 3-cyclohexanedimethylamine, ethylene glycol bis (3-aminopropyl) ether, polyetheramine (α - (2-aminomethylethyl) - ω - (2-aminomethylethoxy) polyethylene glycol), and bisphenol a.
Preferably, the mass percentage of 1, 3-cyclohexanediamine in the curing agent is 30-50%, for example, it may be 32%, 35%, 38%, 40%, 42%, 45% or 48%, and the specific values between the above values are not exhaustive, for the sake of brevity and for the sake of brevity.
Preferably, the mass percent of ethylene glycol bis (3-aminopropyl) ether in the curing agent is 25-30%, such as 26%, 27%, 28% or 29%, and specific point values between the above point values, which are limited in space and for the sake of brevity, the present invention is not exhaustive of the specific point values included in the range.
Preferably, the bisphenol A content of the curing agent is 20-25% by mass, for example 21%, 22%, 23% or 24%, and the specific values between the above values are not exhaustive, for reasons of space and for reasons of simplicity.
Preferably, the mass percent of polyetheramine (α - (2-aminomethylethyl) - ω - (2-aminomethylethoxy) polyethylene glycol) in the curing agent is 12.5-20%, for example, 13%, 14%, 15%, 16%, 17%, 18% or 19%, and specific point values between the above point values, are limited in scope and for brevity, the invention is not intended to be exhaustive of the specific point values included in the ranges.
Illustratively, the curing agent is commercially available, such as AY30 FAST.
Preferably, the mass ratio of the epoxy resin to the curing agent is 1 (0.2-0.5), for example, 1:0.22, 1:0.25, 1:0.28, 1:0.3, 1:0.32, 1:0.35, 1:0.38, 1:0.4, 1:0.42, 1:0.45 or 1:0.48, etc.
As a preferred embodiment of the present invention, the type of the epoxy resin is an epoxy laminate resin (for example, model EL 2); the curing agent adopts AY30 FAST, the polarity of the curing agent is low, and the crosslinking density of the epoxy resin is high during curing, so that the cured epoxy resin has extremely low water absorption and excellent moisture resistance; meanwhile, the surfaces of the carbon fiber and the aramid fiber have no hydrogen bond, so the carbon fiber and the aramid fiber have no water absorption. The composite cone has extremely low water absorption and excellent moisture resistance through the design and mutual compounding of the epoxy resin, the curing agent, the carbon fiber and the aramid fiber, thereby expanding the application of the loudspeaker product containing the composite cone in the fields of outdoor, underwater, ships, water motorcycles and the like.
Preferably, the solvent comprises any one or a combination of at least two of an ester solvent, a ketone solvent, and an aromatic solvent.
Preferably, the ester solvent comprises ethyl acetate and/or butyl acetate.
Preferably, the ketone solvent comprises any one or a combination of at least two of acetone, butanone, cyclohexanone and methyl isobutyl ketone.
Preferably, the aromatic hydrocarbon solvent comprises any one or a combination of at least two of toluene, xylene and trimethylbenzene.
Preferably, the solvent comprises any one or a combination of at least two of ethyl acetate, acetone, butanone and cyclohexanone, and even more preferably cyclohexanone.
Preferably, the mass ratio of the epoxy resin to the solvent is 1 (2.5-6.5), for example, 1:2.6, 1:2.8, 1:3, 1:3.5, 1:4, 1:4.5, 1:5, 1:5.5, 1:6, 1:6.2 or 1:6.4, etc.
As a preferable technical scheme of the invention, the mass ratio of the epoxy resin to the curing agent to the solvent is 1 (0.2-0.5) (2.5-6.5), so that the epoxy resin has proper epoxy resin concentration and viscosity, and after the first cone blank is fully soaked in the epoxy resin, the epoxy resin (epoxy resin plus curing agent) can permeate into and remain in the first cone blank, adhere to the interweaving sites of the carbon fibers and the aramid fibers in the cone, and provide excellent bonding performance. If the consumption of the solvent is too small, the viscosity of the epoxy glue solution is too large, and the penetration effect of the epoxy glue solution in the first cone blank is weakened, so that the Young modulus of the prepared composite cone is smaller; and the epoxy resin is enriched on the surface of the cone, so that the density of the composite cone is larger. If the solvent is used too much, the epoxy resin and the curing agent remain in the first cone blank less, and the bonding force between the carbon fiber and the aramid fiber is weakened, so that the Young's modulus of the prepared composite cone is smaller and the strength is insufficient.
Preferably, when the aramid fiber is dispersed in water for pulping, the mass ratio of the aramid fiber to the water is 1 (230-300), for example, 1:235, 1:240, 1:245, 1:250, 1:255, 1:260, 1:265, 1:270, 1:275, 1:280, 1:285, 1:290 or 1:295, etc.
Preferably, the beating of the aramid fibers is performed by using a groove-type beater.
Preferably, the clearance between the fly cutter and the bed cutter in the process of dispersing the aramid fiber in water for beating is 0.1-0.3mm, for example, may be 0.12mm, 0.15mm, 0.18mm, 0.2mm, 0.22mm, 0.25mm or 0.28mm, and specific point values among the above point values are limited in space and for simplicity, the present invention is not exhaustive list of specific point values included in the range.
Preferably, the beating time is 4-10h, for example, 4.5h, 5h, 5.5h, 6h, 6.5h, 7h, 7.5h, 8h, 8.5h, 9h or 9.5h, and specific point values between the above point values, are limited in length and for brevity, the present invention is not exhaustive of the specific point values included in the range.
Preferably, the component A has a click degree of 15-40 SR, which may be, for example, 16 SR, 18 SR, 20 SR, 22 SR, 25 SR, 28 SR, 30 SR, 32 SR, 35 SR or 38 SR, and specific point values between the above point values, are limited in scope and for brevity the invention is not intended to be exhaustive list of specific point values comprised by the range.
According to the preferable technical scheme, the aramid fiber is pulped by adopting a specific pulping process, the mass ratio of the aramid fiber to water is controlled to be 1 (230-300), the gap between the fly cutter and the bed cutter is controlled to be 0.1-0.3mm, so that the fly cutter and the bed cutter have no shearing action on the aramid fiber in the pulping process, the high-orientation skin layer of the aramid fiber is separated by virtue of mutual friction between the aramid fibers, the microfibrils of the core layer are extracted, and the plush-shaped yarn-dividing yarns are formed and wound around a trunk, so that a large number of plush-shaped micro fibers are obtained on the surface of the aramid fiber by yarn-dividing, the yarn-dividing brooming degree of the aramid fiber is furthest improved, the component A with the beating degree (beating degree) of 15-40 DEG SR is obtained, the average length of the aramid fiber in the component A is 5.5-6.5mm, the yarn-dividing degree is obviously improved, the interweaving point and the binding force of the aramid fiber and the carbon fiber are improved, and the yarn-dividing degree is used as winding fiber, and the strength of a composite sound basin can be improved.
Preferably, the mixed material further comprises water and a dispersant.
Preferably, the dispersant comprises polyethylene glycol.
Preferably, the mass of the dispersing agent is 50-120%, for example, 60%, 70%, 80%, 90%, 100%, 110% or 115%, and specific point values between the above point values, based on 100% of the total mass of the aramid fiber (absolute dry weight of component a) and carbon fiber, are limited in space and the invention is not exhaustive of the specific point values included in the range for brevity.
As a preferable technical scheme of the invention, when the component B is prepared, the component A (aramid pulp) and the carbon fiber are dispersed in water, polyethylene glycol is added to improve the dispersibility of the aramid fiber and the carbon fiber, and the polyethylene glycol is fully and uniformly stirred, so that the carbon fiber is wrapped and wound by the aramid fiber subjected to beating treatment in the component A, and a cone structure taking the carbon fiber as a supporting fiber and the aramid fiber as a winding fiber is constructed.
Preferably, the preparation method of the cone wet embryo specifically comprises the following steps: and (3) diluting the group B with water, and filtering to obtain the cone wet embryo.
Preferably, the temperature of the first hot press is 150-200 ℃, and may be 155 ℃, 160 ℃, 165 ℃, 170 ℃, 175 ℃, 180 ℃, 185 ℃, 190 ℃ or 195 ℃, and specific point values among the above point values, which are limited in space and for the sake of brevity, the present invention is not exhaustive of the specific point values included in the range.
Preferably, the time of the first hot pressing is 20-45s, for example, 22s, 25s, 28s, 30s, 32s, 35s, 38s, 40s, 42s or 44s, and the specific point values among the above point values are limited in space and for the sake of brevity, the present invention does not exhaustively list the specific point values included in the range.
As a preferable technical scheme of the invention, the first hot pressing does not need to increase pressure additionally, and relies on the weight of the upper die of the hot pressing dieMeasuring, namely dehydrating and molding a cone wet blank; drying the first cone blank by hot pressing to obtain a first cone blank with a density of 0.4-0.55g/cm 3 In the range, the gaps among the fibers of the first cone blank are larger, the structure is loose, the structure is similar to that of a bird nest, and the loose structure is favorable for the epoxy glue to permeate and remain in the first cone blank, so that the epoxy glue is adhered to the interweaving sites of the carbon fibers and the aramid fibers.
Preferably, the density of the first cone blank is 0.4-0.55g/cm 3 For example, it may be 0.42g/cm 3 、0.45g/cm 3 、0.48g/cm 3 、0.5g/cm 3 、0.52g/cm 3 Or 0.54g/cm 3 And the particular values between the above-mentioned values, are limited in space and for brevity, the invention is not intended to exhaustively enumerate the specific values included in the range.
Preferably, the temperature of the second hot press is 150-200 ℃, and may be 155 ℃, 160 ℃, 165 ℃, 170 ℃, 175 ℃, 180 ℃, 185 ℃, 190 ℃ or 195 ℃, and specific point values between the above point values, which are limited in space and for the sake of brevity, the present invention is not exhaustive of the specific point values included in the range.
Preferably, the pressure of the second hot pressing is 0.2-0.6MPa, for example, may be 0.25MPa, 0.3MPa, 0.35MPa, 0.38MPa, 0.4MPa, 0.45MPa, 0.5MPa or 0.55MPa, and specific point values between the above point values, which are limited in space and for brevity, the present invention is not exhaustive.
Preferably, the second hot pressing time is 60-90s, for example, 62s, 65s, 68s, 70s, 72s, 75s, 78s, 80s, 82s, 85s or 88s, and specific point values among the above point values, which are limited in space and for the sake of brevity, the present invention is not exhaustive.
As a preferable technical scheme of the invention, the second hot pressing needs to be pressurized, and the pressure of the hot pressing is 0.2-0.6MPa. The pressure is increased in the second hot pressing, so that the carbon fiber and the aramid fiber can be tightly combined, the porosity of the cone is reduced, and the rigidity of the cone is improved; in the process, the epoxy resin can be heated and solidified, so that on one hand, the bonding effect between the carbon fiber and the aramid fiber can be achieved, and on the other hand, the strength of the solidified epoxy adhesive is improved, and the strength of the composite cone is further improved.
Preferably, the second hot pressing step further includes a step of punching to remove excess mesopores and edges.
Preferably, the preparation method comprises the following raw materials in parts by mass:
the preparation method specifically comprises the following steps:
dispersing aramid fiber in water for pulping, wherein the mass ratio of the aramid fiber to the water is 1 (230-300), the gap between a fly cutter and a bed cutter is 0.1-0.3mm, and pulping is carried out for 4-10h to obtain a component A with a beating degree of 15-40 DEG SR;
dispersing the component A and the carbon fiber in water, and adding polyethylene glycol as a dispersing agent to obtain a component B;
providing an epoxy glue solution, wherein the epoxy glue solution comprises epoxy resin, a curing agent and a solvent in a mass ratio of (0.2-0.5) to (2.5-6.5);
diluting the component B with water, and filtering to obtain a cone wet blank;
performing first hot pressing on the cone wet embryo at 150-200deg.C to obtain cone wet embryo with density of 0.4-0.55g/cm 3 Is a first cone blank;
placing the first cone blank in epoxy glue solution for full immersion, and then placing the first cone blank until the surface is dry to obtain a second cone blank;
and (3) carrying out second hot pressing on the second cone blank under the conditions that the temperature is 150-200 ℃ and the pressure is 0.2-0.6MPa, and then punching to obtain the composite cone.
In a second aspect, the present invention provides a composite cone, which is prepared by the preparation method according to the first aspect.
Preferably, the density of the composite cone is 0.75-0.95g/cm 3 Further preferably 0.81-0.88g/cm 3 。
Preferably, the Young's modulus of the composite cone is more than or equal to 8GPa, more preferably more than or equal to 8.4GPa, still more preferably more than or equal to 8.9GPa, and can be 8.94-9.76GPa.
Preferably, the water absorption rate of the composite cone is less than or equal to 0.6%, more preferably less than or equal to 0.45%, still more preferably less than or equal to 0.25%, and can be 0.19-0.23%.
In a third aspect, the present invention provides a loudspeaker comprising a composite cone as described in the second aspect.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the preparation method of the composite cone, the carbon fiber, the aramid fiber and the epoxy resin are designed and synergistically acted, and the preparation method is combined with a specific preparation process, so that the advantages of high strength and high modulus of the carbon fiber and the aramid fiber are effectively exerted, and meanwhile, the excellent interweaving force and high binding force are formed between the carbon fiber and the aramid fiber based on the cooperation of the epoxy resin and the specific process, so that the composite cone is high in strength and excellent in waterproof and moistureproof performances.
(2) The preparation method provided by the invention can be used for preparing the composite cone with higher taper and complex shape, and when the composite cone is applied to a loudspeaker, the frequency response range of the loudspeaker can be expanded, the weather resistance of the loudspeaker is improved, the application of the loudspeaker product in the fields of outdoors, underwater, ships, water motorcycles and the like is expanded, and the application range of the loudspeaker is greatly widened.
(3) The invention ensures that the Young modulus of the composite cone is more than or equal to 8.9GPa and the density is 0.81-0.88g/cm through the design of components and the optimization of the preparation process 3 The water absorption rate is less than or equal to 0.25 percent, the waterproof performance reaches IPX7, and the loudspeaker has high strength, high modulus, low density, low water absorption and moisture absorption rate, high weather resistance and stability, and higher high frequencyCut-off frequency, can be applied in more severe humid environments.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
The terms "comprising," "including," "having," "containing," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, step, method, article, or apparatus.
In the present invention, features defining "first", "second", and "third" may explicitly or implicitly include one or more of such features for distinguishing between the descriptive features, and not sequentially or lightly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the following specific embodiments of the present invention, specific information of materials used is as follows:
(1) Aramid fiber: para-aramid fiber with an average length of 6mm was purchased from Guangzhou city rhyme Qie electroacoustic technology development Co.
(2) Carbon fiber: the chopped carbon fibers have an average length of 6mm and are purchased from Guangzhou City rhyme and Qie electroacoustic technology development Co.
(3) Polyethylene glycol: purchased from Shanghai Ala Biochemical technologies Co., ltd.
(4) Epoxy resin: epoxy laminate resin, EL2, was purchased from composite materials easy to purchase (Beijing) technology Co., ltd.
(5) Curing agent: AY30 FAST, available from Complex Material easy Purchase (Beijing) technology Co., ltd.
(6) Solvent: cyclohexanone, available from Shanghai Ala Biochemical technologies Co., ltd.
Example 1
A composite cone and a preparation method thereof, wherein the preparation raw materials comprise the following components in parts by mass:
the preparation method comprises the following steps:
(1) Dispersing aramid fiber in water, wherein the mass ratio of the aramid fiber to the water is 1:280, pulping by a groove type pulping machine, wherein the clearance between a fly cutter and a bed cutter is 0.2mm, and pulping for 8 hours to obtain a component A with a beating degree of 30 DEG SR;
dispersing the component A and the carbon fiber in water, adding polyethylene glycol (the addition amount of the polyethylene glycol is 100 percent based on the absolute dry amount of the component A and the total mass of the carbon fiber as 100 percent) as a dispersing agent, and fully stirring and uniformly dispersing to obtain a component B;
mixing epoxy resin, a curing agent and cyclohexanone according to a mass ratio of 5:1.5:26, and uniformly stirring to obtain epoxy glue solution;
(2) Diluting the component B obtained in the step (1) with water, and filtering to obtain a cone wet blank;
(3) Placing the cone wet blank obtained in the step (2) in a high-temperature mold for hot-press drying, wherein the hot-press temperature is 185 ℃, the hot-press pressure is not additionally increased, and squeezing and drying for 35s to obtain a first cone blank;
(4) Placing the first cone blank obtained in the step (3) in epoxy glue solution for soaking to completely wet, and placing the first cone blank until the surface is dry to obtain a second cone blank;
(5) Transferring the second cone blank obtained in the step (4) to a hot-pressing die for second hot-pressing shaping, wherein the hot-pressing pressure is 0.5MPa, and the time is 75s; and then punching out redundant mesopores and rim charge to obtain the composite cone.
Examples 2 to 10, comparative examples 1 to 4
A composite cone and a method for manufacturing the same are different from example 1 in that at least one of the amount of raw materials to be manufactured, the degree of beating of component A, and the pressure of the second hot press is different, specifically as shown in Table 1. In Table 1, the amount of the raw materials for preparation is in "parts", "-" means that the component is not added; the process and parameters not shown in table 1 are the same as in example 1.
TABLE 1
Comparative example 5
A composite cone and a preparation method thereof are different from example 1 only in that carbon fibers are replaced by glass fibers with equal mass, and other components, amounts and preparation methods are the same as in example 1.
Comparative example 6
The composite cone and the preparation method thereof are different from the embodiment 1 only in that the aramid fiber is not pulped, the aramid fiber and the carbon fiber are directly mixed according to the formula amount, and the wet embryo of the cone is obtained by adding water for dilution and then filtering; the components and other preparation steps are the same as in example 1
Comparative example 7
The composite cone and the preparation method thereof are different from the embodiment 1 only in that the epoxy resin is replaced by phenolic resin with the same quality (with the brand 803L, purchased from Guangzhou Usta Kogyo composite materials science and technology Co., ltd.) and the curing agent is not needed, and other components, the amounts and the preparation method are the same as those of the embodiment 1.
The composite cones provided in examples 1-10 and comparative examples 1-7 were tested for performance by the following method:
(1) Density: the method comprises the steps that a mass/volume method is adopted, the mass of a composite cone is measured through an electronic balance, the thickness of the composite cone is measured through a micrometer, and the volume of the composite cone is calculated through a 3D model of the composite cone;
(2) Young's modulus: the Young's modulus of the composite cone is tested by adopting a material parameter testing module (MPM) in KLIPPEL R & D SYSTEM for representing the strength of the composite cone;
(3) Moisture resistance: the lower the water absorption, the better the moisture resistance is expressed in terms of water absorption. The specific test method comprises the following steps: placing the composite cone in an environment with the temperature of 25 ℃ and the humidity of 85% for 14 days, and recording the weight gain percentage of the composite cone before and after storage, namely the water absorption rate;
(4) Waterproof performance:
IPX5 level test standard: water spraying test; test equipment: the inner diameter of the water jet of the nozzle is 6.3mm; test conditions: the distance from the sample to be measured to the water jet is 2.5-3m, and the water flow is 12.5L/min; test time: and calculating according to the surface area of the shell of the sample to be tested, wherein each square meter is 1min (excluding the installation area), and the total test time is not less than 3min.
IPX6 level test standard: strong water spraying test; test equipment: the inner diameter of the water jet of the nozzle is 12.5mm; test conditions: the distance from the sample to be measured to the water jet is 2.5-3m, and the water flow is 100L/min; test time: and calculating according to the surface area of the shell of the sample to be tested, wherein each square meter is 1min (excluding the installation area), and the total test time is not less than 3min.
IPX7 level test standard: short-time soaking test; test equipment and test conditions: the size of the immersion tank is that after the sample to be detected is placed in the immersion tank, the distance from the bottom of the sample to the water surface is at least 1m, and the distance from the top of the sample to the water surface is at least 0.15m; test time: 30min.
The test results are shown in table 2:
TABLE 2
As can be seen from the test data in Table 2, the invention adopts the carbon fiber, the aramid fiber and the epoxy resin with specific dosage for compounding, and the components are synergistic and complementary in performance with specific dosage and are mutually synergistic with a specific preparation method, so that the Young modulus of the composite cone provided in the embodiment 1-4 is 8.94-9.76GPa, and the density is 0.81-0.88g/cm 3 The water absorption is 0.19-0.23%, the waterproof performance can reach IPX7, and the waterproof performance has high strength, high modulus, low density and good weather resistance, so that the waterproof performance comprisesIts speaker has a higher cut-off frequency of high frequencies and its application in more severe humid environments.
In the preparation method, the epoxy glue solution has proper epoxy resin concentration and viscosity by controlling the proportion of the epoxy resin, the curing agent and the solvent, and after the first cone blank with loose structure is fully soaked in the epoxy glue solution, the epoxy glue can permeate into and remain in the first cone blank and adhere to the interweaving sites of the carbon fibers and the aramid fibers in the cone, so that excellent bonding performance is provided. In the embodiment 5, the concentration of the epoxy resin is lower, so that the retention amount of the epoxy resin in the composite cone is smaller, and the bonding force between the carbon fiber and the aramid fiber is weakened, so that the Young's modulus of the prepared composite cone is smaller; in the embodiment 6, the concentration of the epoxy resin is higher, and the viscosity of the epoxy glue solution is higher at the moment, so that the penetration effect of the glue solution in the first cone blank is weakened, and the Young modulus of the prepared composite cone is smaller; meanwhile, epoxy resin can be enriched on the surface of the composite cone, so that the density of the composite cone is larger.
In the invention, the carbon fiber, the aramid fiber and the epoxy resin are synergistic and have complementary performances according to specific dosage, so that the advantages of high strength and high modulus of the carbon fiber and the aramid fiber are effectively exerted, and the direct binding force and binding force of the carbon fiber and the aramid fiber are improved.
In example 7, the amount of epoxy resin added was too high, and the density of the resulting composite cone was too high.
In the embodiment 8, the addition amount of the epoxy resin is lower, so that the retention amount of the epoxy resin in the composite cone is smaller, the binding force between the carbon fiber and the aramid fiber is weakened, the Young modulus of the prepared composite cone is smaller, the water absorption rate is increased, and the moisture resistance is lower.
The smaller amount of carbon fiber in example 9 resulted in less rigid fibers in the composite cone for support, and therefore a decrease in young's modulus of the composite cone.
In example 10, the proportion of carbon fibers was large, the interlacing force between the two fibers was weakened, resulting in a loose structure of the composite cone and a large porosity, and further resulting in a decrease in the strength of the composite cone, an increase in water absorption, and a decrease in the waterproof performance.
As is clear from the comparison between example 1 and comparative examples 1 to 3, when carbon fibers are not added to the composite cone, there is no rigid fiber that acts as a support in the cone, and thus the young's modulus of the composite cone decreases. When aramid fibers are not added in the composite cone, the cone is not provided with fibers playing a role of interweaving and winding, and the cone cannot be molded at the moment. After the first cone blank is molded, epoxy resin is not soaked, and at the moment, fibers in the composite cone have only interweaving force and no binding force, so that the composite cone is loose in structure and cannot be tested.
As is clear from the comparison between example 1 and comparative example 4, when the composite cone is not pressurized in the second hot pressing process in the preparation process of the composite cone, the prepared composite cone has a loose structure and a large porosity, resulting in a decrease in strength, an increase in water absorption and a decrease in water resistance of the composite cone.
From a comparison of example 1 and comparative example 5, it is understood that if the carbon fiber is replaced with glass fiber of equal mass, since the glass fiber has a strength smaller than that of the carbon fiber and a specific gravity greater than that of the carbon fiber, the young's modulus and strength of the composite cone are lowered and the density is increased.
As is clear from the comparison of example 1 and comparative example 6, if the aramid fiber is not subjected to the beating treatment, the aramid fiber is directly added, the two fibers have no interweaving force, and the composite cone cannot be molded.
As is clear from the comparison of example 1 and comparative example 7, if the epoxy resin is replaced with the phenolic resin of equal mass, the density of the prepared composite cone is large and the water absorption rate is also increased.
The applicant states that the present invention is described by the above embodiments as to the composite cone of the present invention and the method of making and using it, but the present invention is not limited to the above embodiments, i.e. it does not mean that the present invention must be practiced by relying on the above embodiments. It should be apparent to those skilled in the art that any modification of the present invention, equivalent substitution of raw materials for the product of the present invention, addition of auxiliary components, selection of specific modes, etc., falls within the scope of the present invention and the scope of disclosure.
Claims (10)
1. The preparation method of the composite cone is characterized by comprising the following steps:
dispersing aramid fiber in water for pulping to obtain a component A;
the component A and the carbon fiber are uniformly mixed to obtain a component B;
providing an epoxy glue solution, wherein the epoxy glue solution comprises a combination of epoxy resin, a curing agent and a solvent;
filtering the component B to obtain a cone wet blank;
performing first hot pressing on the cone wet blank to obtain a first cone blank;
immersing the first cone blank in epoxy glue solution and drying to obtain a second cone blank;
and performing second hot pressing on the second cone blank to obtain the composite cone.
2. The production method according to claim 1, wherein the production raw materials in the production method comprise, in parts by mass:
preferably, the average length of the aramid fiber is 5.5-6.5mm;
preferably, the average length of the carbon fibers is 4-7mm.
3. The production method according to claim 1 or 2, wherein the epoxy resin comprises an epoxy laminate resin;
preferably, the curing agent comprises an amine curing agent and/or a phenolic curing agent;
preferably, the mass ratio of the epoxy resin to the curing agent is 1 (0.2-0.5);
preferably, the solvent comprises any one or a combination of at least two of an ester solvent, a ketone solvent and an aromatic hydrocarbon solvent, and further preferably comprises any one or a combination of at least two of ethyl acetate, acetone, butanone and cyclohexanone;
preferably, the mass ratio of the epoxy resin to the solvent is 1 (2.5-6.5).
4. A method according to any one of claims 1 to 3, wherein the mass ratio of aramid fiber to water is 1 (230 to 300);
preferably, the clearance between the fly cutter and the bed cutter is 0.1-0.3mm in the process of dispersing the aramid fiber in water for pulping;
preferably, the beating time is 4-10h;
preferably, the component A has a tapping degree of 15-40 SR.
5. The method of any one of claims 1-4, wherein the mixed material further comprises water and a dispersant;
preferably, the dispersant comprises polyethylene glycol;
preferably, the mass of the dispersing agent is 50-120% based on 100% of the total mass of the aramid fiber and the carbon fiber;
preferably, the preparation method of the cone wet embryo specifically comprises the following steps: and (3) diluting the group B with water, and filtering to obtain the cone wet embryo.
6. The method of any one of claims 1-5, wherein the first hot press is at a temperature of 150-200 ℃;
preferably, the density of the first cone blank is 0.4-0.55g/cm 3 ；
Preferably, the temperature of the second hot press is 150-200 ℃;
preferably, the pressure of the second hot pressing is 0.2-0.6MPa;
preferably, the second hot pressing further includes a step of punching after completion of the second hot pressing.
7. The production method according to any one of claims 1 to 6, characterized in that the raw materials of the production method comprise, in parts by mass:
the preparation method specifically comprises the following steps:
dispersing aramid fiber in water for pulping, wherein the mass ratio of the aramid fiber to the water is 1 (230-300), the gap between a fly cutter and a bed cutter is 0.1-0.3mm, and pulping is carried out for 4-10h to obtain a component A with a beating degree of 15-40 DEG SR;
dispersing the component A and the carbon fiber in water, and adding polyethylene glycol as a dispersing agent to obtain a component B;
providing an epoxy glue solution, wherein the epoxy glue solution comprises epoxy resin, a curing agent and a solvent in a mass ratio of (0.2-0.5) to (2.5-6.5);
diluting the component B with water, and filtering to obtain a cone wet blank;
performing first hot pressing on the cone wet embryo at 150-200deg.C to obtain cone wet embryo with density of 0.4-0.55g/cm 3 Is a first cone blank;
placing the first cone blank in epoxy glue solution for full immersion, and then placing the first cone blank until the surface is dry to obtain a second cone blank;
and (3) carrying out second hot pressing on the second cone blank under the conditions that the temperature is 150-200 ℃ and the pressure is 0.2-0.6MPa, and then punching to obtain the composite cone.
8. A composite cone, characterized in that it is produced by the production method according to any one of claims 1 to 7.
9. The composite cone of claim 8, wherein the composite cone has a density of 0.75-0.95g/cm 3 Preferably 0.81-0.88g/cm 3 ；
Preferably, the Young's modulus of the composite cone is more than or equal to 8GPa, and more preferably more than or equal to 8.9GPa;
preferably, the water absorption rate of the composite cone is less than or equal to 0.6%, and more preferably less than or equal to 0.25%.
10. A loudspeaker, characterized in that it comprises a composite cone according to claim 8 or 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311252544.2A CN117177145A (en) | 2023-09-26 | 2023-09-26 | Composite cone and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311252544.2A CN117177145A (en) | 2023-09-26 | 2023-09-26 | Composite cone and preparation method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117177145A true CN117177145A (en) | 2023-12-05 |
Family
ID=88946871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311252544.2A Pending CN117177145A (en) | 2023-09-26 | 2023-09-26 | Composite cone and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117177145A (en) |
-
2023
- 2023-09-26 CN CN202311252544.2A patent/CN117177145A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102623659B (en) | Lead-acid storage battery partition plate and preparation method thereof | |
| JPH04367198A (en) | Speaker diaphragm | |
| US7238413B2 (en) | Conductive sheet material | |
| CN1516522A (en) | Loudspeaker | |
| CN105870383A (en) | Battery, capacitor diaphragm and preparation method of battery and capacitor diaphragm | |
| CN105113038A (en) | Material for diaphragm of loudspeaker and preparation method thereof | |
| CN110636418A (en) | Loudspeaker cone and preparation method and application thereof | |
| CN108172738B (en) | Preparation method of cellulose-based lithium battery diaphragm base paper | |
| JP5975458B2 (en) | Method for manufacturing diaphragm for electroacoustic transducer | |
| KR101784834B1 (en) | The Speaker by using Nano Cellulose Sheet and Manufacturing Medthod for Nano Cellulose Sheet | |
| CN117177145A (en) | Composite cone and preparation method and application thereof | |
| EP3706434A1 (en) | Speaker vibration plate and method of manufacturing same | |
| CN115506180B (en) | Preparation method of nanocellulose-based lithium ion battery diaphragm | |
| US4026384A (en) | Reconstituted mica acoustic diaphragm | |
| CN105120410A (en) | Loudspeaker | |
| JPH0410800A (en) | Diaphragm for electroacoustic transducer | |
| US8709205B2 (en) | Polyimide short fibers and heat-resistant paper comprising same | |
| CN104233903B (en) | Activated carbon fiber paper and preparation method thereof | |
| CN115434184B (en) | Nano composite coated board paper and preparation method thereof | |
| CN106784545A (en) | A kind of paper structure complex lithium electric separator and preparation method thereof | |
| CN109629320A (en) | A kind of preparation method of the extraordinary thin page base material of plant fiber/glass base | |
| CN111918178B (en) | Preparation method of carbon fiber cone for loudspeaker | |
| JP4008559B2 (en) | Method for manufacturing diaphragm for electroacoustic transducer and diaphragm for electroacoustic transducer | |
| CN116887151A (en) | Paper cone, preparation method thereof and loudspeaker comprising paper cone | |
| JPS6041397A (en) | Production of acoustic diaphragm |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |