A conductive particle/silicone rubber pressure-sensitive material and its preparation method and application

A technology of conductive particles and pressure-sensitive materials, which is applied in the field of pressure-sensitive conductive rubber composite materials and its preparation, can solve the problems of limited strength variation range, weak positive pressure coefficient effect, single processing technology, etc., and achieve adjustable pressure-sensitive strength, The effect of strong repeatability and high pressure sensitivity

Active Publication Date: 2016-02-03
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of existing silicon rubber pressure-sensitive materials such as weak positive pressure coefficient effect, single processing technology that cannot be industrialized, and limited strength variation range, the present invention proposes a conductive particle / silicone rubber pressure-sensitive material, adding a second phase of non-conductive After adding particles, the pressure-sensitive strength of conductive silicone rubber is significantly improved, and the pressure-sensitive strength of the material can be adjusted by changing the amount of second-phase non-conductive particles; at the same time, other functional properties are also endowed to the material

Method used

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  • A conductive particle/silicone rubber pressure-sensitive material and its preparation method and application
  • A conductive particle/silicone rubber pressure-sensitive material and its preparation method and application
  • A conductive particle/silicone rubber pressure-sensitive material and its preparation method and application

Examples

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Effect test

Embodiment 1

[0039] Take 2 parts by mass of aminopropyltriethoxysilane-modified carbon nanotubes (10-20nm, length 5-15μm) and 1 part by mass of montmorillonite and blend them in a beaker, add ethanol (25 parts by mass ) into a paste, ultrasonicated for 20 minutes (ultrasonic probe power 100000 Hz), the filler and 100 parts of methyl vinyl silicone rubber (molecular weight 620,000, vinyl content 0.15wt%) were pretreated at room temperature with an open double-roller plasticizer. Mixing; the flake premix was placed in a vacuum oven at 60°C for 24 hours to remove the ethanol solvent; then the premix was placed in the chamber of a Haake torque rheometer, and blended for 30min at 150°C and 120rpm / min to obtain montmorillonite / The primary product of carbon nanotube compound filling silicone rubber mixture.

[0040]Add the vulcanizing agent double 2,5 (the amount is 1.2% of the mass of the initial mixture) to the prepared montmorillonite / carbon nanotube compound filled silicone rubber mixture, i...

Embodiment 2

[0043] Take aminopropyltriethoxysilane-modified carbon nanotubes (10~20nm, length 5~15μm) 8 parts by mass and 3 parts by mass of montmorillonite and blend them in a beaker, add ethanol (70 parts by mass ) into a paste, and ultrasonicated for 40 minutes (ultrasonic probe power 1000Hz), the filler and 100 parts of methyl vinyl silicone rubber (molecular weight 620,000, vinyl content 0.15wt%) were pre-prepared at room temperature with an open double-roller plasticizer. Mixing; the flake premix was placed in a vacuum oven at 100°C for 8h, and the ethanol solvent was removed; then the premix was placed in the chamber of a Haake torque rheometer, and blended for 40min at 100°C and 80rpm / min to obtain montmorillonite / The initial product of carbon tube compound filling silicone rubber mixture.

[0044] Add the vulcanizing agent double 2,5 (the amount is 1.0% of the mass of the initial product of the montmorillonite / carbon tube composite filling silicone rubber mixture) to the prepare...

Embodiment 3

[0047] Take γ-methacryloxypropyltrimethoxysilane modified carbon nanofibers (diameter 150nm, length 5-10μm) 12 parts by mass and 1 part by mass of montmorillonite, blend them in a beaker, add ethanol (80 parts by mass) prepared into a paste, ultrasonicated for 30min (ultrasonic probe power 10000Hz), the filler and 100 parts of methyl vinyl silicone rubber (molecular weight 790,000, vinyl content 0.19wt% ) premixed at room temperature; the flake premix was placed in a vacuum oven at 40°C for 20 hours, and the ethanol solvent was removed; then the premix was placed in the chamber of a Haake torque rheometer, and blended at 100°C and 120rpm / min for 5min to obtain The initial product of montmorillonite / nanometer carbon fiber composite filling silicone rubber mixture.

[0048] Add vulcanizing agent bis-2,5 to the crude mixture prepared by 2wt% mass ratio, vulcanize for 10min in a flat vulcanizer at 170°C and 15MPa, and finally obtain a montmorillonite / nano-carbon fiber composite fi...

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Abstract

The invention relates to the technical field of nano composite materials and provides a conductive particle / silicone rubber pressure-sensitive material aiming at solving the problems that an existing silicon rubber pressure-sensitive material is weak in a positive pressure coefficient effect, a processing technology is single, industrialization cannot be realized, intensity variation range is limited and the like. The conductive particle / silicone rubber pressure-sensitive material is prepared from the following components in parts by mass: 1-8 parts of silane coupling agent modified carbon nano tube or 4-20 parts of silane coupling agent modified carbon nanofiber, 100 parts of methyl vinyl silicone rubber and 0.5-3 parts of second phase non-conductive particles. After the second phase non-conductive particles are added, pressure sensitivity of conductive silicone rubber is obviously improved, and the pressure sensitivity of the conductive particle / silicone rubber pressure-sensitive material can be regulated by changing usage amount of the second phase non-conductive particle; meanwhile, other functional characteristics are given to the conductive particle / silicone rubber pressure-sensitive material.

Description

technical field [0001] The invention relates to the technical field of nanocomposite materials, in particular to a pressure-sensitive conductive rubber composite material and a preparation method thereof. Background technique [0002] Conductive particle / silicone rubber pressure-sensitive material is a new type of pressure-sensitive material, which is different from general pressure-sensitive materials (carbon black-filled pressure-sensitive materials), its relative resistance increases with the increase of pressure, reflecting the positive pressure coefficient effect (PPCR effect), can meet special requirements. However, judging from the research status at home and abroad, the research on carbon black-filled pressure-sensitive rubber occupies a considerable proportion, while the research on carbon tube or nano-carbon fiber-filled pressure-sensitive rubber is less. Existing carbon tube one-dimensional conductive particle filled silicone rubber pressure-sensitive materials h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08K9/06C08K7/06C08K7/00C08K3/04C08K3/34C08K3/22B29C35/02
Inventor 赵丽邬继荣汤龙程裴勇兵蒋剑雄来国桥
Owner HANGZHOU NORMAL UNIVERSITY
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