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Silicon foaming adhesive composition and its preparation method, silicon foaming adhesive and ultrasonic sensor

A foamed rubber and composition technology, applied in the field of silicon foamed rubber composition and preparation thereof, can solve the problems of ultrasonic sensor with large aftershock and impedance, low porosity of silicon foamed rubber, uneven pore size and the like

Active Publication Date: 2013-06-19
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the technical problem of low porosity and non-uniform pore diameter of the silicon foam rubber in the prior art, which lead to large aftershock and impedance of the ultrasonic sensor using the silicon foam rubber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) The ratio (parts by weight) of each component is shown in Table 1: First, add OBSH and alum to the mortar in sequence according to the ratio, and mix evenly for 6 minutes to obtain a foaming mixture; then mix polydimethylsilane according to the ratio Add oxane (molecular weight: 5000), dimethyl silicone oil (viscosity: 10cps), silicone resin (1153 silicone resin), silicon micropowder (average particle size: 2um), coupling agent (KH550) into the mixing drum, and add air bubbles under stirring The mixture was continuously stirred for 20 minutes after the addition; the silicon foam composition of this embodiment was obtained, which was denoted as Z1.

[0050] (2) Fill Z1 on top of the piezoelectric ceramic sheet of the ultrasonic sensor, transfer to a vacuum oven and heat at 140°C for 30 minutes to obtain the ultrasonic sensor S1 containing silicon foam J1.

Embodiment 2-5

[0052] Adopt the same step as embodiment 1 to carry out, difference is:

[0053] In step (1), the formula (parts by weight) of the silicone foam composition is shown in Table 1 below:

[0054] Table 1

[0055] Components (parts by weight) Z1 Z2 Z3 Z4 Z5 Polydimethylsiloxane 62 55 70 50 75 Simethicone 24 35 20 23 15 Silica powder 7 5 5 20 6 Silicone 1 1.5 1 2 0.5 coupling agent 3 1 3 1 2.5 OBSH 1.5 1.5 0.5 1 0.5 Crystal Hydrate Alum, 1.5 Gallbladder, 1 Green vitriol, 0.5 plaster, 3 Glauber's salt, 0.5

[0056] Through the above steps, ultrasonic sensors S2-S5 respectively containing silicon foam rubbers J2-J5 ​​are obtained.

Embodiment 6

[0058] Adopt the same step as embodiment 1 to carry out, difference is:

[0059] In step (3), the heating temperature is 130°C, and the heating time is 40 minutes;

[0060] Through the above steps, the ultrasonic sensor S6 containing the silicon foam J6 is obtained.

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PUM

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Abstract

The invention provides a silicon foaming adhesive composition, by taking the total mass of the silicon foaming adhesive composition as a reference, the silicon foaming adhesive composition has the following ingredients: 50-75% of polydimethylsiloxane, 15-40% of dimethicone, 5-20% of silica micropowder, 0.5-2% of silicone resin, 1-10% of coupling agent, 0.5-3% of 4,4'-oxydibenzenesulfonyl hydrazide, 0.5-3% of crystalline hydrate. The invention also provides a preparation method of the silicon foaming adhesive composition, a silicon foaming adhesive prepared by the silicon foaming adhesive composition and an ultrasonic sensor containing the silicon foaming adhesive. The silicon foaming adhesive has large porosity and uniform aperture distribution, the ultrasonic sensor by using the silicon foaming adhesive has the advantages of small aftershock and low impedance.

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 Patents(China)
IPC IPC(8): C08L83/04C08K13/02C08K3/02C08J9/10C08J3/24G01S7/521
Inventor 周直发罗迪恬周维
Owner BYD CO LTD
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