Fluorine rubber seal element and preparing method thereof

Abstract

The invention provides a fluorinated rubber sealing element; the invention is characterized in that the sealing element is produced by the raw material with the following quality parts: binary fluorinated elastomer of 60 to 80 parts, tetrafluoroethlene propylene rubber of 20 to 40 parts, carbon black of 20 to 40 parts, calcium hydroxide of 3 to 5 parts, metal oxide of 3 to 6 parts, hexafluoride sonitroso propyl diphenol of 1.5 to 2 parts, benzyl triphenyl phosphorus chloride of 0.3 to 0.5 part, processing aid of 0.5 to 2 part, dicumyl peroxide of 0.5 to 1.2 parts, and triene propyl isocyan urate of 0.5 to 1.2 parts. The invention has the preparation method that sulphation for 8 to 12 minutes is molded on a compression machine under 165 to 180 DEG C through being extruded and formed after the raw material with the quality parts are added in mixing equipment to be mixed uniformly under 60 to 80 DEG C, and then the sealing element is produced after performing secondary cure for 8 to 24 hours in hot air of 200 to 250 DEG C. The fluorinated rubber sealing element produced has long service life and can be high temperature water vapor resistant and high and low impact resistant.

Description

technical field [0001] The invention belongs to the technical field of sealing, and in particular relates to a fluororubber sealing part and a preparation method thereof. Background technique [0002] The seals applied to the cylinder liners of diesel generator sets are usually composed of 5 O-ring seals, and the water vapor temperature is generally between 150°C and 200°C. When the diesel engine is working, due to the shock wave of the combustion gas explosion and the relative vibration between the piston and the cylinder liner, and between the cylinder liner and the cylinder block, the cooling water layer close to the outer wall of the cylinder liner will locally generate high pressure and high vacuum. On the surface of the sleeve, the greater the pressure change of the coolant, the phenomenon of air bubbles and bubble formation in the coolant due to the pressure drop is called cavitation. When the formed air bubbles and vapor bubbles are subjected to subsequent high pres...

AI Technical Summary

Problems solved by technology

Binary fluororubber adopts bisphenol vulcanization system, which must be combined with metal oxides to be able to crosslink normally. The use of metal oxides reduces the water vapor resistance of fluororubber vulcanizates; and the long-term resistance of crosslinks formed by bisphenol vulcanization systems Water vapor performance is also poor

Peroxide vulcanized fluororubber has excellent water vapor resistance, but its large-scale application is limited because the price of this type of fluororubber is 4 to 6 times higher than that of ordinary binary fluororubber

Tetrapropylene fluororubber is an ideal peroxide vulcanized fluororubber, which has excellent heat resistance, water vapor resistance and good mechanical strength, but this kind of raw rubber has poor mixing and extrusion process performance and low temperature resistance. The performance is poor, and it is easy to leak immediately after restarting after a period of shutdown; in addition, the resistance to compression set of tetrapropylene fluororubber vulcanizate is also poor, and it is not very suitable for the manufacture of cylinder liner O-shaped cylinders that require high compression deformation resistance. ring seal

The actual use found that the binary fluorine rubber seals used in this situation, the normal working life is only 2 to 4 months, because the generator set equipment is relatively large and complex, the cost of replacement and maintenance is high, and the downtime is long , thus limiting the application of fluororubber seals in this industry