Vibrating diaphragm of sound production device, and sound production device thereof
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A sound-generating device and film technology, applied in the field of electroacoustics, can solve the problems of low material damping performance, bonding failure, low reliability, etc., and achieve the effects of good vibration consistency, improved damping performance, and reduced polarization
Pending Publication Date: 2021-12-10
GOERTEK INC
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However, since the molecular chain of EPDM/EPDM rubber is completely carbon chain structure and the molecular polarity is low, it is difficult for the vibrating membrane of this material to be bonded to the shell, and the problem of bonding failure will occur in long-term use , has the disadvan
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[0065] According to an embodiment of the present invention, there is also provided a method for preparing a diaphragm of a sound generating device, including the following steps: S1, adding a reactant to the base rubber. S2. Carrying out cross-linking molding of the base rubber and a reactant to form a vibrating membrane. Among them, the base rubber is EPDM rubber and / or EPDM rubber, and the reactant is one of polyacrylate, polyethylene-acrylate, polyethylene-vinyl acetate and hydrogenated polybutadiene-acrylonitrile or more.
[0066] Thus, by adding reactants (polyethylene-acrylate and / or polyacrylate and / or polyethylene-vinyl acetate and / or hydrogenated polybutadiene-acrylonitrile) to the base polymer (EPDM and (or binary ethylene propylene rubber), the reactant can form an effective mutual transmission network structure with EPDM rubber and / or binary ethylene propylene rubber molecules, the molecular chain entanglement increases, and the internal friction resistance betwee...
Embodiment 1
[0079] The reactant (polyethylene-acrylate) which accounts for 3% of the total amount of the base rubber and the reactant is cross-linked with 70A EPDM rubber, and after vulcanization, the diaphragm material is formed and assembled into a product.
[0080] Among them, the formula of 70A EPDM rubber is as follows:
[0081] In parts by mass, 100 parts of EPDM; 1 part of sulfur; 3.5 parts of accelerator; 50 parts of carbon black; 20 parts of paraffin oil;
Embodiment 2
[0083] The reactant (polyethylene-acrylate) which accounts for 5% of the total amount of the base rubber and the reactant is cross-linked with 70A EPDM rubber, and after vulcanization, the diaphragm material is formed and assembled into a product.
[0084] Among them, the formula of 70A EPDM rubber is as follows:
[0085] In parts by mass, 100 parts of EPDM; 1 part of sulfur; 3.5 parts of accelerator; 50 parts of carbon black; 20 parts of paraffin oil;
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Abstract
The invention discloses a vibrating diaphragm of a sound production device, and the sound production device. The vibrating diaphragm of the sound production device comprises at least one modified ethylene propylene rubber membrane layer, the modified ethylene propylene rubber membrane layer is made of modified ethylene propylene rubber, and the modified ethylene propylene rubber is formed by a cross-linking reaction of base rubber and a reactant, wherein the base rubber is ethylene propylene diene monomer and/or ethylene propylene diene monomer, and the reactant is one or more of polyacrylate, polyethylene-acrylate, polyethylene-vinyl acetate and hydrogenated polybutadiene-acrylonitrile. According to the vibrating diaphragm, the modified ethylene propylene rubber formed by adding the reactant into the ethylene propylene diene monomer and/or the ethylene propylene diene monomer to carry out the crosslinking reaction is adopted as the raw material to prepare the vibrating diaphragm, so that the good rebound resilience and adhesion of the vibrating diaphragm can be ensured, the damping performance of the vibrating diaphragm can be improved, and the acoustic performance of the sound production device is effectively ensured.
Description
technical field [0001] The present invention relates to the field of electroacoustic technology, and more specifically, to a diaphragm of a sound generating device and a sound generating device using the diaphragm. Background technique [0002] With the improvement of requirements for high power, waterproof performance and high sound quality of speakers, diaphragms made of different rubber materials have been widely used in the field of speakers. However, since the molecular chain of EPDM / EPDM rubber is completely carbon chain structure and the molecular polarity is low, it is difficult for the diaphragm made of this material to be bonded to the housing, and the problem of bonding failure will occur in long-term use , has the disadvantage of low reliability. Moreover, due to the high molecular chain compliance of EPDM / EPDM materials and low material damping performance, the diaphragm prepared by this material is prone to distortion in the use of speakers, which is difficult...
Claims
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