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Acrylic damping glue and voice diaphragm for loudspeaker

An acrylic and acrylic technology, used in the field of sound film of speakers and acrylic damping glue, can solve the problems of low damping response with frequency, narrow damping temperature range, and mismatching damping conditions with loudspeaker operating conditions, and achieve high responsiveness. , the effect of high system stability

Active Publication Date: 2021-05-04
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the pressure-sensitive adhesives used in this industry generally have a relatively narrow damping temperature range (concentrated in the -20-0°C region), the damping conditions do not match the speaker's working conditions, and the damping has a low frequency response.

Method used

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  • Acrylic damping glue and voice diaphragm for loudspeaker
  • Acrylic damping glue and voice diaphragm for loudspeaker
  • Acrylic damping glue and voice diaphragm for loudspeaker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Preparation of acrylic polymer A: In a 1L reactor, add 200g of monomers (wherein the total weight of the monomers is 100%, including 26.5% by weight of isooctyl acrylate, 70% by weight of butyl acrylate ester and 3.5% by weight of acrylic acid), 5 g of isopropanol as a chain transfer agent, and 295 g of ethyl acetate to obtain a reaction mixture. The reaction mixture was deoxygenated with nitrogen for 2 minutes, then 0.2 g of AIBN initiator was added thereto. The temperature of the reaction mixture was raised to 60°C for 4 hours, and then heated to 65°C for 20 hours to obtain a solution containing acrylic polymer A with a solid content of 40% by weight. The glass transition temperature of the acrylic polymer A measured by the glass transition temperature test method described above was -30°C.

[0057] Preparation of acrylic polymer B: In a 1L reactor, add 200g of monomers (wherein the total weight of the monomers is 100%, including 81% by weight of isooctyl acrylate an...

Embodiment 2

[0062] Preparation of acrylic polymer A: In a 1L reactor, add 200g of monomers (wherein the total weight of the monomers is 100%, including 80% by weight of isooctyl acrylate, 18% by weight of methyl acrylate ester and 2% by weight of acrylic acid), 5 g of isopropanol as a chain transfer agent, and 295 g of ethyl acetate to obtain a reaction mixture. The reaction mixture was deoxygenated with nitrogen for 2 minutes, then 0.2 g of AIBN initiator was added thereto. The temperature of the reaction mixture was raised to 60° C. for 4 hours, and then heated to 65° C. for 20 hours to obtain a solution containing the acrylic polymer A. The glass transition temperature of the acrylic polymer A as measured by the glass transition temperature test method described above was -35°C.

[0063] Preparation of acrylic polymer B: In a 1L reactor, add 200g of monomers (wherein the total weight of the monomers is 100%, including 77% by weight of isooctyl acrylate and 23% by weight of acrylic aci...

Embodiment 3

[0068] Preparation of acrylic polymer A: In a 1L reactor, add 200g of monomers (wherein the total weight of the monomers is 100%, including 80% by weight of isooctyl acrylate, 19% by weight of methyl acrylate ester and 1% by weight of acrylic acid), 5 g of isopropanol as a chain transfer agent, and 295 g of ethyl acetate to obtain a reaction mixture. The reaction mixture was deoxygenated with nitrogen for 2 minutes, then 0.2 g of AIBN initiator was added thereto. The temperature of the reaction mixture was raised to 60° C. for 4 hours, and then heated to 65° C. for 20 hours to obtain a solution containing the acrylic polymer A. The glass transition temperature of the acrylic polymer A as measured by the glass transition temperature test method described above was -28°C.

[0069] Preparation of acrylic polymer B: In a 1L reactor, add 200g of monomers (wherein the total weight of the monomers is 100%, including 75% by weight of isooctyl acrylate and 25% by weight of acrylic aci...

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Abstract

The invention provides acrylic damping glue. The acrylic damping glue comprises a cross-linked structure of a carboxyl-containing acrylic polymer with the glass transition temperature smaller than or equal to -20 DEG C and a carboxyl-containing acrylic polymer with the glass transition temperature within the range of 20-50 DEG C. According to the technical scheme, the acrylic damping glue shows double damping peaks in a rheological curve, so that the acrylic damping glue has a wide damping temperature range (the damping temperature range is larger than or equal to 50 DEG C, preferably larger than or equal to 90 DEG C) and high damping responsiveness along with frequency, and has high system stability.

Description

technical field [0001] The invention relates to the technical field of acoustic devices, in particular, the invention provides an acrylic damping glue and a sound film for a loudspeaker. Background technique [0002] With the rapid development of the mobile phone industry, customers' demand for mobile multimedia applications is increasing, and the quality requirements for mobile phone sound are also further improved. The micro-speaker is the sound-generating part of the mobile phone, and its sound quality directly determines the multimedia sound effect of the mobile phone. The sounding principle of the micro-speaker is that the voice coil pushes the sound film to vibrate under the action of electromagnetic force, and then pushes the air to produce sound. The stability of the sound film vibration directly determines the sound quality of the speaker. [0003] The sound film of early miniature speakers usually adopts a single-layer plastic film, including, for example, polypr...

Claims

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Application Information

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IPC IPC(8): C08L33/08H04R9/06H04R9/02
CPCC08L33/064H04R9/06H04R9/02C08L2205/025H04R2307/025H04R7/00C09J133/08C08F220/1804C08F220/1808C08F220/18C08K5/3432C08K5/29C08K5/1515C08K5/0091C08F220/06C08F220/14C09J2301/312C09J2203/326H04R7/26H04R2307/201
Inventor 杨超刘宏波林盼盼段琼娟
Owner 3M INNOVATIVE PROPERTIES CO