A kind of graphene modified fluorine rubber and preparation method thereof
A technology of graphene modification and fluorine rubber, which is applied in the field of fluorine rubber synthesis, can solve the problems of difficult separation of graphene sheets and limited functions, and achieve the effects of performance improvement, simple operation, and easy large-scale promotion
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Embodiment 1
[0036] The present embodiment relates to a kind of preparation method of graphene modified fluorine rubber, comprises the steps:
[0037] 1) In a 5L stainless steel reaction kettle with a stirrer, add 1L of deionized water, 2g of dipotassium hydrogen phosphate, 2g of emulsifier perfluoropolyether ammonium carboxylate, repeat nitrogen pressurization, evacuation and degassing, and then pour into the reaction kettle The oxygen content is less than 20ppm;
[0038] 2) add the mixed monomer of VDF / HFP=60 / 40 (molar ratio) in reactor with compressor, boost to 0.3MPa, then add 2kg of treated graphene dispersion liquid (graphene fraction is 20g / 2kg (ion-free water)) to start stirring, raise the temperature, and when the temperature reaches 80°C, use the diaphragm compressor to continuously input the mixed monomer to the reactor to increase the pressure to 1.5MPa;
[0039] 3) 20g of 15% (wt) ammonium persulfate aqueous solution was pressed into by a metering pump to initiate polymeriza...
Embodiment 2
[0042] The present embodiment relates to a kind of preparation method of graphene modified fluorine rubber, comprises the steps:
[0043] 1) In a 5L stainless steel reaction kettle with a stirrer, add 1L of deionized water, 2g of dipotassium hydrogen phosphate, 2g of emulsifier perfluoropolyether ammonium carboxylate, repeat nitrogen pressurization, evacuation and degassing, and then pour into the reaction kettle The oxygen content is less than 20ppm;
[0044] 2) Add the mixed monomer of VDF / HFP / TFE=60 / 20 / 20 (molar ratio) in reactor with compressor, boost to 0.3MPa, then add 2kg of treated graphene dispersion liquid (graphene The fraction is 40g / 2kg (ion-free water)), start stirring, raise the temperature, and when the temperature reaches 80°C, use the diaphragm compressor to continuously input the mixed monomer to the reactor to increase the pressure to 1.5MPa;
[0045] 3) then press into 20g of 15% (wt) ammonium persulfate aqueous solution by metering pump, initiate polymer...
Embodiment 3
[0048] The present embodiment relates to a kind of preparation method of graphene modified fluorine rubber, comprises the steps:
[0049] 1) In a 5L stainless steel reaction kettle with a stirrer, add 1L of deionized water, 2g of dipotassium hydrogen phosphate, 2g of emulsifier perfluoropolyether ammonium carboxylate, repeat nitrogen pressurization, evacuation and degassing, and then pour into the reaction kettle The oxygen content is less than 20ppm;
[0050] 2) Add the mixed monomer of VDF / HFP / TFE=60 / 22 / 18 (molar ratio) in reactor with compressor, boost to 0.3MPa, then add 2kg of treated graphene dispersion liquid (graphene The fraction is 80g / 2kg (ion-free water)), start stirring, raise the temperature, and when the temperature reaches 90°C, use the diaphragm compressor to continuously input the mixed monomer to the reactor to increase the pressure to 1.8MPa;
[0051] 3) 10g of 15% (wt) ammonium persulfate aqueous solution was pressed into by a metering pump to initiate po...
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Abstract
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