Acoustic absorbing material, preparation method thereof and loudspeaker applying acoustic absorbing material

A technology of sound-absorbing materials and molecular sieves, applied in the field of sound-absorbing materials, to achieve the effects of improving low-frequency acoustic performance, increasing volume, and improving low-frequency response

Active Publication Date: 2017-05-31
AAC TECH NANJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the third effect is the most obvious. At present, the zeolites filled in the back cavity are mainly mol

Method used

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  • Acoustic absorbing material, preparation method thereof and loudspeaker applying acoustic absorbing material
  • Acoustic absorbing material, preparation method thereof and loudspeaker applying acoustic absorbing material
  • Acoustic absorbing material, preparation method thereof and loudspeaker applying acoustic absorbing material

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preparation example Construction

[0046] The present invention also provides a preparation method for the sound-absorbing material in the speaker, which includes the following steps:

[0047] Step S1, using silicon source, M source, alkali source, templating agent and hydration to synthesize a MEL structure molecular sieve with a molar ratio of silicon element to other element M of at least 80;

[0048] Among them, the silicon source includes tetraethyl orthosilicate, silica sol and sodium silicate; the M source is determined according to the skeleton of the molecular sieve with MEL structure; the alkali source includes sodium hydroxide, potassium hydroxide and lithium hydroxide; the template is tetrabutyl quaternary Ammonium salt, which can be at least one of tetrabutylammonium bromide, tetrabutylammonium hydroxide, tetrabutylammonium chloride, tetrabutylammonium iodide and tetrabutylammonium fluoride.

[0049] Step S2, washing, drying, pulverizing and roasting the molecular sieve with MEL structure synthesiz...

Embodiment 1

[0057] The sound-absorbing material of this embodiment includes MEL and MFI mixed-phase structural molecular sieves, and its preparation method is as follows:

[0058] Silicon sources (including tetraethyl orthosilicate, silica sol and sodium silicate), aluminum sources (including aluminum nitrate, sodium metaaluminate and aluminum isopropoxide), alkali sources (including sodium hydroxide, potassium hydroxide and hydrogen Lithium oxide), the templating agent is tetrabutyl quaternary ammonium salt (at least one of tetrabutyl ammonium bromide, tetrabutyl ammonium hydroxide, tetrabutyl ammonium chloride, tetrabutyl ammonium iodide and tetrabutyl ammonium fluoride species) and the mol ratio of the hydrated silicon and aluminum elements are 250 MEL and MFI mixed-phase structure molecular sieves, and its XRD spectrum is as follows figure 2 As shown, the low-temperature nitrogen adsorption is characterized as Figure 5 As shown, the nitrogen adsorption and desorption at room temper...

Embodiment 2

[0060] The sound-absorbing material of this embodiment includes MEL and MFI mixed-phase structural molecular sieves, and its preparation method is as follows:

[0061] Silicon source (including tetraethyl orthosilicate, silica sol and sodium silicate), iron source (including ferric nitrate, ferric sulfate and ferric chloride), alkali source (including sodium hydroxide, potassium hydroxide and lithium hydroxide) , the templating agent is tetrabutyl quaternary ammonium salt (at least one of tetrabutyl ammonium bromide, tetrabutyl ammonium hydroxide, tetrabutyl ammonium chloride, tetrabutyl ammonium iodide and tetrabutyl ammonium fluoride) and Hydrated molecular sieves with a molar ratio of silicon and iron elements of 300 in MEL and MFI mixed-phase structures, and their low-temperature nitrogen adsorption characteristics are as follows Figure 5 shown.

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Abstract

The invention provides an acoustic absorbing material, comprising an MEL structure molecule sieve. A skeleton of the MEL structure molecule sieve comprises silicon dioxide. The acoustic absorbing material provided by the invention has uniform micropores. Under the effect of acoustic pressure, the micropores absorb air molecules, thereby increasing the volume of a virtual acoustic cavity. After the acoustic absorbing material is filled in a rear cavity of a loudspeaker, the low frequency response of the loudspeaker can be improved clearly, and the low frequency acoustic performance is improved. The invention also provides a preparation method for the acoustic absorbing material and the loudspeaker applying the acoustic absorbing material.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of sound-absorbing materials, in particular to a sound-absorbing material, a preparation method thereof and a loudspeaker using the sound-absorbing material. [0003] 【Background technique】 [0004] With the development of science and technology, people have higher and higher requirements for speakers, especially for mobile phone speakers. The requirement is not only small size and sound, but also small size and good sound quality. The sound quality is related to all aspects of the speaker design and manufacturing process, especially the size of the rear cavity design of the speaker. Usually, the reduction of the rear cavity of the speaker will significantly reduce the response of the low frequency band, resulting in poor sound quality, so it is difficult to provide good sound quality under the condition of a small rear cavity. [0005] In order to solve the above technical problems, the usual metho...

Claims

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Application Information

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IPC IPC(8): H04R9/06H04R9/02C01B39/04C01B39/06H04R31/00
CPCC01B39/04C01B39/06C01P2002/72H04R9/02H04R9/06H04R31/00H04R2400/11C01B39/46G10K11/002G10K11/165H04R1/288
Inventor 冯宏枢
Owner AAC TECH NANJING
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