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Method for preparing high-performance conductive silicone rubber through in-situ ring-opening polymerization of cyclosiloxane

A technology of ring-opening polymerization and cyclosiloxane, which is applied in the field of preparing high-performance conductive silicone rubber nanocomposites through vulcanization molding, which can solve the problems of complex process, poor tear resistance, and low elongation of conductive silicone rubber. Achieve the effects of uniform distribution, excellent elasticity and tensile properties, and simple preparation methods

Inactive Publication Date: 2019-11-05
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The current method of preparing conductive silicone rubber is usually by adding powder. The conductive silicone rubber prepared by this method has low elongation, poor tear resistance, and is not conducive to environmental protection and the health of operators, and the process is complicated. shortcoming

Method used

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  • Method for preparing high-performance conductive silicone rubber through in-situ ring-opening polymerization of cyclosiloxane
  • Method for preparing high-performance conductive silicone rubber through in-situ ring-opening polymerization of cyclosiloxane
  • Method for preparing high-performance conductive silicone rubber through in-situ ring-opening polymerization of cyclosiloxane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Under the protection of nitrogen, under the condition of 100°C, 100 parts by mass of octamethylcyclotetrasiloxane (50.0g) and 1 part of tetramethyltetravinylcyclotetrasiloxane (0.5g) were mixed uniformly, and added 5 parts of carbon fiber particles (2.5g), 10 parts of fumed silica (5.0g), 1 part of 2,5-dimethyl-2,5-di-tert-butylperoxyhexane (0.5g), maintain high speed Stir, add 0.01 parts by mass of phosphazene alkali catalyst toluene solution (catalyst concentration 0.05M), the polymerization reaction starts, the viscosity of the reaction system increases rapidly, and the condition of 100 ° C is kept for 20 minutes to obtain uniform in-situ doped carbon fiber particles. Polysiloxane premix material.

[0047] The above in-situ doped polysiloxane premixed material was added into the mold, and vulcanized for 10 minutes at a vulcanization temperature of 170° C. to obtain an in-situ doped carbon fiber silicone rubber nanocomposite material. The silicone rubber had a volume...

Embodiment 2

[0049] Under the protection of nitrogen, under the condition of 100°C, 100 parts by mass of octamethylcyclotetrasiloxane (50.0g) and 1 part of tetramethyltetravinylcyclotetrasiloxane (0.5g) were mixed uniformly, and added 10 parts of conductive carbon black nanoparticles (5.0g), 20 parts of fumed silica (10.0g), 1 part of 2,5-dimethyl-2,5-di-tert-butylperoxyhexane (0.5g) , maintain high-speed stirring, add 0.01 parts by mass of phosphazene alkali catalyst toluene solution (catalyst concentration 0.05M), the polymerization reaction starts, the viscosity of the reaction system increases rapidly, and continue to maintain the condition of 100 ° C for 20 minutes to obtain uniform in-situ doping Polysiloxane premix of conductive carbon black particles.

[0050] The above in-situ doped polysiloxane premixed material was added into a mold, and vulcanized for 10 minutes at a vulcanization temperature of 170° C. to obtain an in-situ doped conductive carbon black silicone rubber nanocomp...

Embodiment 3

[0052] Under nitrogen protection, at 60°C, 100 parts by mass of octamethylcyclotetrasiloxane (50.0g), 1 part of tetramethylcyclotetrasiloxane (0.5g) and 1 part of tetramethylcyclotetrasiloxane Tetravinylcyclotetrasiloxane (0.5g) is mixed evenly, adds 10 parts of conductive carbon black nanoparticles (5.0g), 20 parts of fumed silica (10.0g), 0.01 part of Karstedt catalyst (platinum-siloxane Complex, Pt content 5000ppm) (5.0mg), maintain high-speed stirring, add the phosphazene base catalyst toluene solution (catalyst concentration 0.05M) of 0.01 parts by mass, the polymerization reaction starts, the viscosity of the reaction system increases rapidly, and continues to maintain 60 °C for 30 minutes to obtain a uniform polysiloxane premixed material in-situ doped with conductive carbon black nanoparticles.

[0053] The above in-situ doped polysiloxane premixed material was added into a mold, and vulcanized for 8 hours at a vulcanization temperature of 80° C. to obtain in-situ dope...

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Abstract

The invention discloses a method of adopting an organic phosphonitrile catalyst without metal elements for catalyzing cyclosiloxane monomers doped with conductive filling particles, reinforcing fillers and a vulcanizing agent to realize preparation of polysiloxane doped with the conductive filling particles through in-situ ring-opening polymerization and preparation of a conductive silicone rubbernano composite material through vulcanization molding. The silicone rubber nano composite material can be prepared by means of a one-pot approach, the preparation method is simple and efficient, allthe fillers can be added before polymerization and uniformly mixed with the monomers, and the in-situ polymerization effect of the cyclosiloxane monomers is not influenced by the fillers. The surfaceappearance of the obtained silicone rubber composite material is flat and smooth, the filling particles are uniformly dispersed, the good mechanical property of pure vulcanized silicone rubber is maintained, and the silicone rubber composite material has excellent conductivity.

Description

technical field [0001] The invention relates to a method for preparing high-performance conductive silicone rubber by in-situ ring-opening polymerization of cyclosiloxane, in particular to the preparation of polysilicon doped with conductive filler particles by using an organophosphazene catalyst to catalyze the in-situ ring-opening polymerization of cyclosiloxane Oxane, and a method for preparing high-performance conductive silicone rubber nanocomposites through vulcanization molding. Background technique [0002] Conductive silicone rubber is a kind of composite material with both electrical conductivity and mechanical properties, and has good piezoresistive and temperature resistance properties. Conductive fillers can not only endow composite materials with conductivity, but also reduce material costs, significantly improve various properties of composite materials, and make them more widely used, such as aviation, industry, electrical, and daily life. For conductive sil...

Claims

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Application Information

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IPC IPC(8): C08G77/08C08G77/06C08G77/20C08K7/06C08K7/26C08K3/04C08K9/06C08K9/10C08K5/14C08L83/07C08L79/02
CPCC08G77/08C08G77/06C08G77/20C08K7/06C08K7/26C08K3/04C08K9/06C08K3/041C08K9/10C08K5/14C08L83/04C08K2201/001C08K2201/011C08L79/02
Inventor 李志波赵娜时金凤
Owner QINGDAO UNIV OF SCI & TECH
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