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Sound-absorbing material and loudspeaker box with same

A sound-absorbing material and grain technology, applied in the field of sound-absorbing materials, can solve the problems of small specific surface area and pore volume, limit the acoustic performance of speakers, limited air absorption capacity, etc. The effect of improving absorption capacity and adsorption capacity

Pending Publication Date: 2019-05-24
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 specific surface area and pore volume of the zeolite molecular sieve are small, and the ability to absorb air is limited, which limits the improvement of the acoustic performance of the speaker.

Method used

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  • Sound-absorbing material and loudspeaker box with same
  • Sound-absorbing material and loudspeaker box with same
  • Sound-absorbing material and loudspeaker box with same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0037] With silicon source (at least one in orthosilicate, silica sol and sodium silicate), aluminum source (at least one in aluminum chloride, aluminum nitrate and aluminum sulfate), alkali source (sodium hydroxide, hydrogen Potassium oxide, lithium hydroxide and organic base at least one), microporous stencil agent (tetrapropyl ammonium bromide, tetrapropyl ammonium hydroxide, tetrapropyl ammonium chloride, n-hexylamine and ethylenediamine and n-butyl At least one of the amines) and water are mixed according to the original ratio of Si / Al atomic molar ratio of 400, and stirred once at room temperature for one hour.

[0038] Then add soft templating agent (3-aminopropyltriethoxysilane, phenyltriethoxysilane, chloropropyltriethoxysilane or hexadecyltrimethylammonium bromide, dodecyl At least one of cationic surfactants such as t...

Embodiment 2

[0041] Please also refer to Figure 3-4 Shown, the zeolite 1 in the figure is the zeolite molecular sieve of the microporous material of related art, and the molecular structure of described zeolite 1 is pure phase MFI structure, and the atomic molar ratio of its Si / Al is 400; The zeolite 2 in the figure is this The zeolite molecular sieve of the invented mesoporous material, the zeolite 2 has a pure-phase MFI structure, and its Si / Al atomic molar ratio is 400.

[0042] For the low-temperature nitrogen adsorption capacity and pore structure parameters of the zeolite molecular sieve of the microporous material and the zeolite molecular sieve of the mesoporous material, see image 3 , it can be seen that compared with the zeolite 1, the specific surface area S of the zeolite 2 BET Increased from 397㎡ / g to 549㎡ / g, pore volume from 0.25cm 3 / g increased to 0.39cm 3 / g, that is, the specific surface area and pore volume of the zeolite 2 are respectively increased by 38% and 56% ...

Embodiment 3

[0045] According to the preparation method of the above-mentioned sound-absorbing material, during the synthesis process of the crystal grains of the zeolite molecular sieve, the mesoporous soft templates with different amounts of mesoporous Zeolite 3, zeolite 4 and zeolite 5, all of which have a Si / Al atomic molar ratio of 400. The zeolite 1 of Example 2, the zeolite 3, the zeolite 4 and the zeolite 5 of Example 3 are respectively filled in the rear cavity of the speaker system (the volume of the rear cavity of the tooling is 1 cubic centimeter, referred to as 1cc) Acoustic performance tests were carried out, and the results are shown in Table 1. It should be noted that the Q value (quality factor) is a set of parameters describing the damping coefficient of the loudspeaker.

[0046] Table 1 Resonance frequency F before and after adding different molecular sieves in the speaker cavity 0 and Q value

[0047]

[0048] As can be seen from the data in Table 1, as the...

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Abstract

The invention provides a sound-absorbing material. The sound-absorbing material comprises zeolite molecular sieves and is characterized in that each zeolite molecular sieve comprises a plurality of particles, each particle comprises a plurality of grains, each grain comprises a porous framework and a positive ion outside the framework, and each framework comprises SiO2 and oxide MxOy containing element M; each zeolite molecular sieve further comprises mesopores which include intergranular mesopores among the grains and transgranular mesopores penetrating the grains; the atom mole ratio of Si / Min each framework is 100-2000. Compared with the prior art, the sound-absorbing material applied to the loudspeaker box can evidently improve the low frequency performance of a loudspeaker.

Description

【Technical field】 [0001] The invention relates to the technical field of sound-absorbing materials, in particular to a sound-absorbing material and a speaker box with the sound-absorbing material. 【Background technique】 [0002] With the development of science and technology, electronic communication equipment is becoming more and more miniaturized, and the resonance space of the speaker system is also further compressed, especially for mobile phone speakers. Provides very good sound quality. [0003] In the related art, the sound-absorbing material is filled in the cavity of the speaker box, and the sound-absorbing material usually adopts a zeolite molecular sieve with a large number of micropores, and the air compliance can be improved by using the zeolite molecular sieve to absorb and desorb air. Lifting reduces the resonance frequency of the speaker box, which has the equivalent effect of virtually increasing the resonance space, thereby improving the acoustic performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/162G10K11/26H04R1/28C01B37/00C01B39/04C04B26/00C04B28/00C04B111/52
Inventor 戴际强冯宏枢唐琨王和志
Owner AAC TECH NANJING
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