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Sound absorbing material and speaker using sound absorbing material

A sound-absorbing material and molecular sieve technology, applied in the field of loudspeakers, can solve the problems of poor crystallinity of MEL structure, no low-frequency improvement effect, attenuation of acoustic performance, etc., to increase long-term stability, increase resistance to VOCs and resistance to performance attenuation, The effect of not easy to absorb water

Inactive Publication Date: 2019-01-04
AAC TECH NANJING
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AI Technical Summary

Problems solved by technology

Among them, the MEL structure molecular sieve framework is mainly composed of silica and aluminum oxide. If the mass ratio of Si / Al is lower than 80, it will significantly absorb moisture in the air and occupy most of the micropore channels of the molecular sieve, resulting in no low-frequency improvement. Effect
In addition, when using metal ions containing element M to synthesize, if the mass ratio of Si / M is too low, it will cause difficulty in synthesis or the crystallinity of the synthesized MEL structure will be poor or poor.
However, when the quality of Si / Al is relatively high, although the water absorption rate is low and the initial acoustic effect is guaranteed, as time goes by, the MEL structure molecular sieve absorbs a very small amount of volatile organic compounds (VOCs) emitted by the speaker body, which makes its acoustics performance degradation

Method used

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  • Sound absorbing material and speaker using sound absorbing material
  • Sound absorbing material and speaker using sound absorbing material
  • Sound absorbing material and speaker using sound absorbing material

Examples

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Effect test

preparation example Construction

[0049] The present invention also provides the preparation method of the above-mentioned sound-absorbing material:

[0050] Step 1: Using a silicon source, an alkali source, a template agent, a M source and hydration to synthesize a molecular sieve with a MEL structure in which the mass of the silicon element and the element M is between 150 and 2000.

[0051] Regarding step one, specifically, the M source is an element M source (neither a silicon element source), and the synthesis raw materials (silicon source, M source, template agent, alkali source, etc.) are added to the synthesis reaction kettle, and then passed The crystallization reaction obtains molecular sieve powder with MEL structure. The crystallization reaction is generally carried out in the water phase for a certain period of time, also known as hydrothermal reaction; the temperature of the hydrothermal reaction is generally from room temperature to 250°C, preferably from room temperature to 180°C; the pressure ...

Embodiment 1

[0061] The sound-absorbing material of this embodiment includes MEL and MFI mixed-phase structural molecular sieves, and its preparation method is as follows:

[0062] Use silicon source (including orthosilicate, silica sol, sodium silicate, etc.), aluminum source (aluminum nitrate, sodium metaaluminate, aluminum isopropoxide, etc.), alkali source (sodium hydroxide, potassium hydroxide and hydrogen Lithium oxide), template 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 hydrated Si / Al mass ratio of 250 MEL and MFI miscible structure molecular sieve, its XRD pattern is shown in figure 1 Shown, low-temperature nitrogen adsorption characterization see Figure 4 Shown, normal temperature nitrogen adsorption and desorption see Figure 6 shown.

Embodiment 2

[0064] The sound-absorbing material of this embodiment includes MEL and MFI mixed-phase structural molecular sieves, and its preparation method is as follows:

[0065] Use silicon source (including orthosilicate, silica sol, sodium silicate, etc.), iron source (ferric nitrate, ferric sulfate and ferric chloride), alkali source (sodium hydroxide, potassium hydroxide and lithium hydroxide), Template agent is tetrabutylammonium salt (at least one in tetrabutylammonium bromide, tetrabutylammonium hydroxide, tetrabutylammonium chloride, tetrabutylammonium iodide and tetrabutylammonium fluoride) and water Synthesized MEL and MFI mixed-phase structure molecular sieves with a Si / Fe mass ratio of 300, the acoustic properties are shown in Table 1, and the low-temperature nitrogen adsorption characterization is shown in Figure 4 shown.

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Abstract

The invention provides a sound absorbing material. The material comprises an MEL structure molecular sieve, the MEL structure molecular sieve comprises a skeleton and a skeleton outer cation, the skeleton comprises silicon oxide and an oxide MxOy of an element M containing a non-silicon element, the skeleton is characterized in that the mass ratio of Si / M in the skeleton is at least 80, the skeleton outer cation comprises at least one of a hydrogen ion, an alkali metal ion, an alkaline earth metal ion and a transition metal ion, and the content of the skeleton outer cation is between 0.05 wt.% and 1.5wt. %. The invention also provides a speaker using the sound absorbing material. Compared with the prior art, the sound absorbing material of the molecular sieve of the MEL structure is addedto the speaker, which can significantly improve the low frequency performance of the speaker, and the sound absorbing material has strong resistance to performance degradation in practical applications.

Description

【Technical field】 [0001] The invention relates to the technical field of sound-absorbing materials, in particular to a sound-absorbing material and a loudspeaker using the sound-absorbing material. 【Background technique】 [0002] 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. [0003] In order to solve the above technical problems, the usual methods mainly include the following: 1. Replace t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/48C01B39/08H04R9/06
CPCC01B39/087C01B39/48C01P2002/72C01P2002/80H04R9/06C01B39/04C01B39/06G10K11/162H04R1/288H04R2499/11G10K11/165H04R1/2876
Inventor 冯宏枢王和志唐琨戴际强
Owner AAC TECH NANJING
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