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A silicon foam composition and its preparation method, a silicon foam and an ultrasonic sensor

A foaming rubber and composition technology, which is applied in the direction of using wave/particle radiation devices to transmit sensing components, re-radiation of sound waves, piezoelectric/electrostrictive transducer microphones, etc. Due to the complex preparation process of styrofoam, the effects of small aftershocks, high sensitivity and simplified process are achieved.

Active Publication Date: 2011-11-30
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the technical problems of complex preparation process of silicon foam rubber and large aftershock of ultrasonic sensor in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) The distribution ratio (mass ratio) of each component in the silicone foam composition is as shown in Table 1;

[0051] (2) First, add OBSH, AC and foaming agent into the mortar in sequence according to the ratio, and mix evenly for 6 minutes to obtain a foaming mixture; then add polydimethylsiloxane, dimethyl silicone oil, silicone resin, silicon Add the micropowder and coupling agent into the mixing drum, add the air bubble mixture while stirring, and continue stirring for 15 minutes after the addition, to obtain the silicon foam composition of this embodiment, which is designated as Z1.

[0052] (3) Fill Z1 into the top of the piezoelectric ceramic sheet of the ultrasonic sensor, and heat in an oven at 120° C. for 20 minutes to obtain the ultrasonic sensor S1 of this embodiment.

Embodiment 2-5

[0054] Adopt the same step as embodiment 1 to carry out, difference is:

[0055] In step (1), the silicone foam composition formula (mass ratio) is as shown in Table 1 below:

[0056] Table 1

[0057] components

[0058] Through the above steps, the ultrasonic sensors S2-S5 of Examples 2-5 are obtained.

Embodiment 6

[0060] Adopt the same step as embodiment 1 to carry out, difference is:

[0061] In step (3), the heating temperature is 115° C., and the heating time is 30 minutes;

[0062] Through the above steps, the ultrasonic sensor S6 of this embodiment is obtained.

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PUM

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Abstract

The invention provides a silicon foaming adhesive composition. On the reference of the total mass of the silicon foaming adhesive composition, the composition comprises the following ingredients: 45-80% of polydimethylsiloxane, 10-45% of dimethicone; 5-30% of silicon powder, 0.5-2% of silicone resion, 1-10% of coupling agent; 0.5-3% of 4,4'-oxylbisbenzenesulfonyl hydrazide, 0.5-3% of azodicarbonamide and 0.5-3% of foaming aids. The invention also provides a preparation method of the silicon foaming adhesive composition, and a silicon foaming adhesive prepared by the silicon foaming adhesive composition as well as an ultrasonic sensor containing the silicon foaming adhesive. The ultrasonic sensor of the present invention has the advantages of weak aftershock, low impedance and high sensitivity.

Description

technical field [0001] The invention relates to a silicon foam glue composition and a preparation method thereof, a silicon foam glue and an ultrasonic sensor. Background technique [0002] In the ultrasonic sensor, due to the vibration of the piezoelectric element, the bottom surface of the housing vibrates, and the ultrasonic signal is emitted. After hitting an obstacle, it is reflected by the obstacle and returns to the same ultrasonic sensor to detect the obstacle. Under normal circumstances, when the shell of the ultrasonic sensor vibrates, ultrasonic signals will be generated inside the shell, causing internal leakage of vibration energy, and the shell will generate high-order spurious vibration. Even if the piezoelectric element no longer vibrates, the shell vibration will continue, which is called chaos. ring. If the reverberation lasts for a long time, the ultrasonic signal generated by the piezoelectric element due to the reverberation will interfere or even overw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K3/34C08J9/10H04R17/02G01S15/04G01D5/48
Inventor 周直发罗迪恬周维
Owner BYD CO LTD
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