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Peroxide vulcanized fluororubber with low Mooney viscosity and high fluorine content

A low Mooney viscosity, vulcanized fluorine rubber technology, applied in the field of fluorine chemical industry, can solve the problems of high Mooney viscosity, poor vulcanization effect, easy bubbles in the vulcanized test piece, etc., to achieve the effect of high strength and wide application

Inactive Publication Date: 2020-01-14
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fluorine rubber synthesized by this method has high Mooney viscosity, and the vulcanization effect of this low Mooney fluorine rubber is poor by using bisphenol, and bubbles are prone to appear in the vulcanized test piece.
[0006] Patent ZL201410331103.6 discloses a fluororubber with low Mooney viscosity and high fluorine content and its preparation method. Vinylidene fluoride, tetrafluoroethylene, and hexafluoropropylene are used as comonomers and formed by emulsion polymerization. The Mooney viscosity of the product is 18~30(ML1=10min@121℃), the product adopts bisphenol system for vulcanization, after vulcanization, the product has poor properties such as tensile strength, elongation and methanol resistance

Method used

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  • Peroxide vulcanized fluororubber with low Mooney viscosity and high fluorine content
  • Peroxide vulcanized fluororubber with low Mooney viscosity and high fluorine content
  • Peroxide vulcanized fluororubber with low Mooney viscosity and high fluorine content

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] In this embodiment, VDF:TFE:HFP=65:15:20 (molar ratio).

[0051] Add 30L of non-ionized water, 60g of dipotassium hydrogen phosphate, 30g of emulsifier to a 50L stainless steel reactor with a stirrer, vacuumize the reactor until its oxygen content is ≤30ppm, and increase the temperature in the reactor to 80℃ ;

[0052] Add the three main comonomers of VDF / TFE / HFP to the reactor until the pressure in the kettle reaches 4.0MPa; add 400g of 3,3,4,4-tetrafluoro-4-iodobut-1-ene, and add initiator Potassium persulfate 10g, chain transfer agent 1,4-diiodoperfluorobutane 800g, the reaction started, and at the same time, the three main comonomers of VDF / TFE / HFP were added to make the reaction pressure of the reactor within the range of 4.0±0.1MPa.

[0053] With the progress of the reaction, when the cumulative feeding amount reaches 15kg, the feeding is stopped and the reaction is completed; the fluororubber emulsion is obtained, coagulated with magnesium chloride aqueous solution, wa...

Embodiment 2

[0060] In this embodiment, VDF:TFE:HFP=60:20:20 (molar ratio).

[0061] Add 30L of non-ionized water, 60g of dipotassium hydrogen phosphate, 30g of emulsifier to a 50L stainless steel reactor with a stirrer, vacuumize the reactor until its oxygen content is ≤30ppm, and increase the temperature in the reactor to 80℃ ;

[0062] Add the three main comonomers of VDF / TFE / HFP to the reactor until the pressure in the kettle reaches 4.0MPa; add 400g of 3,3,4,4-tetrafluoro-4-iodobut-1-ene, and add initiator Potassium persulfate 10g, chain transfer agent 1,4-diiodoperfluorobutane 700g, the reaction started, and the three main comonomers of VDF / TFE / HFP were added to make the reaction pressure of the reactor within the range of 4.0±0.1MPa.

[0063] With the progress of the reaction, when the cumulative feeding amount reaches 15kg, the feeding is stopped and the reaction is completed; the fluororubber emulsion is obtained, coagulated with magnesium chloride aqueous solution, washed with ion-free...

Embodiment 3

[0068] In this embodiment, VDF:TFE:HFP=30:20:50 (molar ratio).

[0069] Add 30L of non-ionized water, 60g of dipotassium hydrogen phosphate, 30g of emulsifier to a 50L stainless steel reactor with a stirrer, vacuumize the reactor until its oxygen content is ≤30ppm, and increase the temperature in the reactor to 80℃ ;

[0070] Add the three main comonomers of VDF / TFE / HFP to the reactor until the pressure in the kettle reaches 4.5MPa; add 400g of 3,3,4,4-tetrafluoro-4-iodobut-1-ene, and add initiator Potassium persulfate 15g, chain transfer agent 1,4-diiodoperfluorobutane 200g, the reaction started, and the three main comonomers of VDF / TFE / HFP were added to make the reaction pressure of the reactor within 4.5±0.1MPa.

[0071] With the progress of the reaction, when the cumulative feeding amount reaches 15kg, the feeding is stopped and the reaction is completed; the fluororubber emulsion is obtained, coagulated with magnesium chloride aqueous solution, washed with ion-free water, and d...

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Abstract

The invention relates to a peroxide vulcanized fluororubber with low Mooney viscosity and high fluorine content. The rubber is prepared by emulsion polymerization reaction with vinylidene fluoride, tetrafluoroethylene and perfluoropropylene as main comonomers, halogenated perfluoroolefin as vulcanization point monomers and iodine-containing alkane as chain transfer agent under certain temperatureand pressure conditions. Its fluorine content is>= 69% and the Mooney viscosity is 2-35. The product has the advantages of good fluidity, can be used for extrusion, injection processing and molding, excellent performance of methanol resistance and other media, and good mechanical performance.

Description

Technical field [0001] The invention relates to a peroxide-vulcanized fluororubber with low Mooney viscosity and high fluorine content, which belongs to the technical field of fluorine chemicals. Background technique [0002] Fluororubber (FKM) refers to a synthetic polymer elastomer with fluorine atoms attached to the carbon atoms of the main chain or side chain of the molecule. Fluorine rubber was first trial-produced by American DuPont company in 1948 as poly-2-fluoro-1.3-butadiene and its copolymers with styrene and propylene, but its performance is not better than that of neoprene and butadiene rubber. Moreover, it is expensive and has no real industrial value. In the late 1950s, American Thiokol Company developed a binary nitroso fluororubber with good low temperature performance and strong oxidant resistance (N2O4), and fluororubber began to enter practical industrial applications. Since then, with technological progress, various new types of fluorine rubber have been co...

Claims

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Application Information

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IPC IPC(8): C08F214/22C08F214/26C08F214/28C08F214/18C08F2/38
CPCC08F2/38C08F214/182C08F214/22C08F214/26C08F214/28
Inventor 曾波汪仲权王先荣张海波
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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