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Preparation of precise resistance/strain sensitive conductive silicon rubber

A technology of precision resistance and conductive silicon, which is applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measuring devices, instruments, etc., can solve the problems of inability to achieve repeatability, achieve good environmental compatibility, good conductivity and ductility, and cost cheap effect

Inactive Publication Date: 2009-04-22
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are also a number of related patents in China. The conductive phase includes carbon black (or graphite), conductive polymer and metal nickel powder, which basically cannot achieve the repeatability of the conductance / strain relationship under multiple strain cycles. The present invention will provide a new preparation Method for Conductive Strain Sensitive Elastomeric Materials to Achieve Certain Repeatable Conductance / Strain Relationships Over Multiple Strain Cycles

Method used

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  • Preparation of precise resistance/strain sensitive conductive silicon rubber
  • Preparation of precise resistance/strain sensitive conductive silicon rubber
  • Preparation of precise resistance/strain sensitive conductive silicon rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Dissolve 3 grams of ruthenium chloride hydrate in 3 liters of analytically pure 1,2-propanediol, heat to 60°C, stir vigorously to dissolve completely, then slowly heat to 150°C and keep for 30 minutes, the solution turns from reddish brown to black, naturally Cool down to room temperature and let it stand for 24 hours. Most of the nanoparticles formed in the solution will settle to the bottom of the container. Remove most of the propylene glycol solution. Clear the solution, then add 100 milliliters of ethanol, repeat washing three times, and dry to obtain metal ruthenium powder with an average particle size of 2 nanometers and an average aggregate size of 200 nanometers. The above powder was heated to 600°C in the air, and kept warm for 0.5 hours to obtain fully oxidized rutile phase ruthenium oxide powder, and the powder was rolled and dispersed to obtain a single ruthenium oxide particle with an average size of 20 nanometers and an average aggregate size of 80 nm rut...

Embodiment 2

[0030] Ultrasonic disperse the above ruthenium oxide powder in ultrapure water and ammonia water with a volume ratio of 1:5, keep it for 20 minutes, centrifuge at 15000g, remove the supernatant solution, disperse the precipitated powder with methanol, precipitate, and repeat washing three times. After drying, the hydrophilic surface is rich in hydroxyl nanometer ruthenium oxide powder, and its infrared absorption spectrum is as follows: image 3 , Figure 4 shown.

[0031] Disperse 0.3 g of the above powder in 10 ml of ethanol ultrapure aqueous solution with a volume ratio of 1:1, then add 0.5 ml of triethoxyvinylsilane, ultrasonicate for 3 minutes, let stand for 3 hours, remove the supernatant, and wash with ethanol Sedimentation, washing three times, drying to obtain surface-modified vinyl ruthenium oxide powder, its infrared absorption spectrum is as follows: figure 2 As shown, the transmission electron micrograph and X-ray diffraction spectrum of ruthenium oxide powder ...

Embodiment 3

[0033] Take 200 mg of methyl vinyl polysiloxane raw rubber material with a vinyl molar ratio of 1% and a molecular weight of 500 kDa, add 472 mg of the above-mentioned surface-modified ruthenium oxide powder, and add 6 mg of surface-modified gas-phase powder with a particle size of 20 nanometers. White carbon black, add 3 ml of n-hexane, after the silica gel is dissolved, grind, ultrasonically disperse, dry at 60°C for 2 hours, then add 13 mg of 2,5-dimethyl-2,5-di-tert-butyl peroxide Hexane, after repeated grinding and mixing, let it stand for 30 minutes, fill it into the mold, the mold pressure is not less than 10Mpa, keep it warm at 175°C for 20 minutes, cool down and demould, and obtain a conductive silicone rubber material with a volume ratio of the conductive phase of 25%. The resistance-pressure relationship of the material under 12 consecutive repetitions of compression deformation is as follows: Figure 4 shown.

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Abstract

The invention discloses a method for preparing a strain sensitivity-conductivity silicone rubber for a precise resistor and relates to a conductivity-strain sensitivity rubber material with low modulus and high repeatability. The preparation method comprises the following steps: the surface of a high-conductivity nanometer ruthenium oxide powder body is subjected to hydrophilization treatment; the surface of the nanometer ruthenium oxide powder body is modified through a silane coupling agent of which a terminal group is an ethylene group to form the conductive ruthenium oxide powder body containing the ethylene group on the surface; the conductive ruthenium oxide powder body is mixed with silicone rubber; the volume percentage of the ruthenium oxide powder body accounts for 17 to 30 percent of the total volume of the mixture; the mixture is added with a vulcanizing agent and a strengthening agent, is mixed, is kept stand for 30 minutes, is put to a mould, is pressurized to a pressure of between 10 and 15 Mpa, is kept at a temperature of between 172 and 178 DEG C for 15 to 30 minutes to obtain the vulcanized silicone rubber composite material; and the conductivity of the vulcanized silicone rubber composite material has the characteristic of repeated change along strain.

Description

technical field [0001] The invention relates to a low-modulus and high-repeatability rubber material whose conductivity is sensitive to strain, belongs to the field of functional polymer composite materials, and is a precision sensor material. Background technique [0002] Most of the various contact-type stress sensing elements currently used measure the physical property changes of specific materials under the stress-induced strain conditions to obtain the stress of the measured object under the same stress conditions, such as resistance strain type and optical fiber type. The limitation of the elastic modulus of the sensing material itself, when measuring the strain of the low modulus material, the strain of the sensing material is lower than the strain of the measured object, not only the strain of the measured material cannot be obtained, but also cause the strain of the contact area with the sensor field interference. The strain sensor based on the low modulus strain ...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08K9/06C08J3/24G01B7/16G01L1/22
Inventor 巴龙周成喜董伟黄渝鸿梅军
Owner SOUTHEAST UNIV
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