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Sound absorption material and loudspeaker box applying sound absorption material

A sound-absorbing material and heteroatom technology, applied in the field of materials, can solve the problems of limited water absorption, low low-frequency performance, limited adsorption capacity, etc., and achieve good hydrophobicity and stability, excellent low-frequency acoustic performance, and good reliability.

Pending Publication Date: 2018-12-14
AAC TECH NANJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the related art, the framework structure of the zeolite molecular sieve is mainly composed of silicon or silica-alumina, which has a limited ability to adsorb oxygen in the air, and will preferentially adsorb water vapor relative to oxygen, so that the low frequency of zeolite or molecular sieve The performance is not high. Although the water absorption performance is limited in the range of high silica zeolite with Si / Al>200, it has limited effect on improving the sound quality of the speaker.

Method used

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  • Sound absorption material and loudspeaker box applying sound absorption material
  • Sound absorption material and loudspeaker box applying sound absorption material
  • Sound absorption material and loudspeaker box applying sound absorption material

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The sound-absorbing material of this embodiment includes molecular sieves with MFI structure, and its preparation method is as follows:

[0037] Use silicon source (including tetraethyl orthosilicate, silica sol, sodium silicate, etc.), iron source (including ferric chloride, ferric nitrate, ferric sulfate, etc.), alkali source (including sodium hydroxide, potassium hydroxide, hydroxide Lithium and organic base), templating agent (including one of tetrapropylammonium bromide, tetrapropylammonium hydroxide, tetrapropylammonium chloride, tetrapropylammonium iodide, n-hexylamine, ethylenediamine and n-butylamine One or more) and water molar ratio Si / Fe = 400 raw material ratio to prepare MFI structure zeolite. After the raw materials were stirred and mixed, they were crystallized at high temperature for 7 days to obtain a heteroatom zeolite molecular sieve sample. Its XRD pattern is as follows figure 2 shown by figure 2 It can be seen that the prepared molecular sieve...

Embodiment 2

[0039] The sound-absorbing material of this embodiment includes molecular sieves with MFI structure, and its preparation method is as follows:

[0040] The material zeolite 1 is a heteroatom zeolite molecular sieve material with iron as a heteroatom and a molecular structure of MFI, and the ratio of synthetic raw materials is Si / Fe=400. The material zeolite 2 is a traditional silica-alumina ZSM-5 zeolite molecular sieve, and the ratio of synthetic raw materials is Si / Al=400. The adsorption capacity of nitrogen and oxygen at room temperature of zeolite molecular sieve materials was measured by ASAP 2020 adsorption instrument of Mack Company. The results of the adsorption test are as follows: Figure 4shown. Obviously, the heteroatom zeolite molecular sieve has more excellent air absorption capacity, especially oxygen absorption capacity; this will make the improvement effect of the material on the sound of the speaker box more obvious.

Embodiment 3

[0042] The sound-absorbing material of this embodiment includes molecular sieves with different Si / Fe molar ratios.

[0043] The preparation method is as shown in Example 1. Different Si / Fe zeolite materials (ie, sound-absorbing materials) were prepared, and the actual Si / Fe atomic molar ratio was analyzed by XRF elemental analysis for comparison. Fill it in the back cavity of the speaker cabinet and test its effect on the low frequency performance of the speaker cabinet. The acoustic properties of the samples with different atomic ratios are shown in Table 1. The volume of the rear cavity of the loudspeaker used for the measurement of the acoustic properties is 1 cubic centimeter (abbreviated as 1cc). It can be seen from the test data that when the molar ratio of Si / Fe atoms is too high or too low, the resonance frequency of the speaker box is higher, which is not conducive to the low-frequency performance improvement effect of the heteroatom zeolite molecular sieve on the sp...

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Abstract

The invention provides a sound absorption material. The sound absorption material comprises a heteroatom zeolite molecular sieve; the heteroatom zeolite molecular sieve comprises a framework and extra-framework cations; the framework comprises SiO2 and a metal oxide MxOy containing metal M, wherein the molar ratio of Si / M in the framework is 250-500, and the M comprises Fe; and the extra-frameworkcations are at least one selected from a group comprising cuprous ions, monovalent silver ions, monovalent gold ions, alkali metal ions or alkaline earth metal ions. The invention further provides aloudspeaker box applying the sound absorption material. Compared with the related art, the loudspeaker box has good acoustic low-frequency performance.

Description

【Technical field】 [0001] The invention relates to the field of materials, in particular to a sound-absorbing material and a speaker box using the sound-absorbing material. 【Background technique】 [0002] With the rapid development of electronic information technology, more and more electronic products are applied to speakers as their sound components, such as mobile phones, notebook computers, etc. However, with the advancement of science and technology, electronic communication equipment is becoming more and more miniaturized, and the resonance space of the speaker box is further compressed. The additional effect can improve the air compliance, thereby reducing the resonant frequency of the loudspeaker, which has the equivalent effect of virtually increasing the resonant space. [0003] A loudspeaker box in the related art includes a sound emitting unit and a cavity filled with sound-absorbing material, and the sound-absorbing material mainly includes zeolite molecular sie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/06
CPCC01B39/065C01P2002/72C01P2004/03C01B39/48H04R1/288H04R1/2803H04R1/025C01P2004/61B01J29/068B01J29/072B01J29/44B01J29/68B01J29/46B01J29/405B01J29/67B01J29/7057B01J29/7615B01J29/7669B01J29/7469B01J29/88B01J29/7415B01J29/7084B01J20/2803B01J20/28007B01J2229/183B01J2229/186B01J29/87B01J29/89B01J2229/42B01J20/28004B01J37/30B01J37/0009B01J20/186B01J37/0072B01J20/18C01B39/44B01J37/031C01B39/36C01B39/46C01B39/06C01B39/38C01B39/087C01B39/082B01J35/40
Inventor 戴际强王和志冯宏枢黄国创唐琨
Owner AAC TECH NANJING
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