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Bi-component room temperature vulcanized silicone rubber composition for sensor and preparation method thereof

A silicone rubber composition, room temperature vulcanization technology, applied in the field of sealants, can solve the problems of easy gaps between the inner cavity side wall of the sensor shell and the sound-absorbing material, affecting the effect of aftershock elimination, and difficult to stir evenly, etc.

Pending Publication Date: 2021-03-30
MIANYANG WELLS ELECTRONICS MATERIAIS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the sound-absorbing cotton has the problem of poor product consistency, and the foamed material has the problem of poor uniformity of pores after foaming and high cost, resulting in relatively large aftershocks of the ultrasonic sensor
CN102260409 discloses a silicon foaming glue composition, the foaming glue needs high temperature to be foamed, and at the same time, there are problems that it is not easy to stir evenly, and the hole diameter of the colloid after foaming is inconsistent, which will affect the aftershock elimination effect
CN1880570A discloses a composite fiber silica gel foam material, which is used to replace sound-absorbing cotton, but during assembly, gaps easily appear between the side wall of the sensor housing cavity and the sound-absorbing material, which will affect the aftershock elimination effect
The sealants currently on the market can basically meet the requirements in terms of hardness, but there are problems of low sound absorption capacity and unsuitable fluidity

Method used

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  • Bi-component room temperature vulcanized silicone rubber composition for sensor and preparation method thereof
  • Bi-component room temperature vulcanized silicone rubber composition for sensor and preparation method thereof
  • Bi-component room temperature vulcanized silicone rubber composition for sensor and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0064] 1. Preparation of modified sound-absorbing filler:

[0065] Heat 100 parts by mass of glass microspheres in an oven at 80°C for 12 hours to remove moisture, then disperse them in absolute ethanol, add 2 parts by mass of silane coupling agent, stir at 80°C for 1.5h, filter, and put them in to dry at 90°C box, add 2h to fully react completely, and get modified glass beads.

[0066] Put 100 parts by mass of vermiculite powder into a high-speed mixer, control the temperature at 120°C, stir to remove water for 2 hours, then lower the temperature of the material to 80°C, add tris(dioctylpyrophosphoryloxy)isopropyl titanate and Mix 30g of isopropanol (mass ratio 1:1), keep the temperature and stir for 30min, then raise the temperature to 120°C, remove all isopropanol, stir and cool at low speed to obtain modified vermiculite powder.

[0067] The modified sound-absorbing filler is obtained by uniformly mixing modified vermiculite powder and modified glass microspheres at a mas...

Embodiment 1

[0071] Component A: Put 100 parts by mass of α, ω-dihydroxypolydimethylsiloxane with a viscosity of 1000mPa·s into a planetary stirring tank, add 30 parts by mass of modified calcium carbonate, and use the precipitation method of silazane surface treatment 5 parts by mass of silicon dioxide were stirred evenly at a high speed, and then 20 parts by mass of a modified sound-absorbing filler were added, stirred and mixed uniformly at a medium speed to obtain component A.

[0072] Component B: In the planetary machine, add 50 parts by mass of methyl-terminated polyorganosiloxane with a viscosity of 1000mPa·s, and add 15 parts by mass of polyethyl silicate, methyl trimethyl 14 parts by mass of ethoxysilane, 7 parts by mass of tris(trimethoxysilylmethyl)isocyanurate, 7 parts by mass of aminopropyltriethoxysilane, 3-(2,3-glycidoxy)propane 7 parts by mass of trimethoxysilane, 0.7 parts by mass of dibutyltin dilaurate, mixed uniformly, and discharged to obtain component B.

[0073] Mi...

Embodiment 2

[0075] Component A: Put 100 parts by mass of α, ω-dihydroxypolydimethylsiloxane with a viscosity of 1000mPa·s into a planetary stirring tank, add 20 parts by mass of modified calcium carbonate, and precipitated by silazane surface treatment 2 parts by mass of French silica, stirred evenly at high speed, then added 30 parts by mass of modified sound-absorbing filler, stirred and mixed uniformly at medium speed to obtain component A.

[0076] Component B: In the planetary machine, add 50 mass parts of methyl-terminated polyorganosiloxane with a viscosity of 500mPa·s, and add 14 mass parts of polyethyl silicate, methyl trimethyl 15 parts by mass of ethoxysilane, 7 parts by mass of three (trimethoxysilyl methyl) isocyanurate, 7 parts by mass of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, 7 parts by mass of 3- 7 parts by mass of (2,3-glycidoxy)propyltrimethoxysilane and 0.5 part by mass of dibutyltin dilaurate were mixed uniformly and discharged to obtain component B.

[0077]...

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Abstract

The invention discloses a bi-component room temperature vulcanized silicone rubber composition for a sensor and a preparation method thereof, the silicone rubber composition is prepared by mixing a component A and a component B. The component A comprises the following components: 100 parts of polyorganosiloxane, 10-30 parts of a modified filler, 20-45 parts of a modified sound-absorbing filler, and 2-5 parts of silicon dioxide. The component B comprises the following components, by weight: 10-30 parts of a cross-linking agent, 21-40 parts of a silane coupling agent, and 0.2-1 part of catalyst.The invention also provides a preparation method of the silicone rubber composition. An ultrasonic sensor adopting the silicone rubber composition as a sealant is small in aftershock and high in sensitivity.

Description

technical field [0001] The invention relates to the technical field of sealants, in particular to a two-component room temperature vulcanized silicone rubber composition for sensors and a preparation method thereof. Background technique [0002] Under the excitation of the voltage, the piezoelectric element in the ultrasonic sensor vibrates, and the bottom surface of the housing vibrates accordingly, emitting an ultrasonic signal. After hitting an obstacle, a reflected echo is formed to act on the piezoelectric element, causing the piezoelectric element to vibrate and restart. Converted into voltage, after processing, the distance and speed of obstacles can be converted. When the shell of the ultrasonic sensor vibrates, diffuse reflections of ultrasonic signals will appear inside the shell, resulting in high-frequency spurious vibrations of the shell. Even if the piezoelectric element stops vibrating, the shell will continue to vibrate for a certain period of time, which is ...

Claims

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Application Information

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IPC IPC(8): C09J183/04C09J183/06C09J183/07C09J11/04
CPCC09J183/04C09J183/06C09J11/04C08L2203/206C08L2205/025C08L2205/02C08K2003/265C08L83/04C08K13/06C08K9/04C08K9/06C08K3/26C08K3/36C08K7/20C08K3/34
Inventor 刘洪芦成赵元刚陆南平
Owner MIANYANG WELLS ELECTRONICS MATERIAIS
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