Fluororubber coating processing technology for foam board

The invention discloses a processing technology of a fluororubber coating for a foam board, which comprises the following steps: S1, preparing raw materials for preparing the fluororubber coating, comprising 100 parts of raw fluororubber, 40-55 parts of carbon black, 4 parts of magnesium oxide, 5 parts of calcium hydroxide, 2-5 parts of a vulcanizing agent, 20-80 parts of silicon resin, 220 parts of an organic solvent, 1 part of a defoaming agent, 0.5 part of a flatting agent, 5 parts of lubricating filler, 12-28 parts of a cross-linking agent and 1-5 parts of an organic amine curing agent. S2, raw fluororubber is put into an open rubber mixing machine to be plastified for 3-4 times, then lubricating filler and a vulcanizing agent are added, and mixing is conducted on an internal mixer for 4-5 times till a tough high-elasticity state is converted into a soft plastic state; the cross-linking agent and the lubricating filler are added into the fluororubber coating and have a synergistic effect, so that the room