Conductive rubber and application thereof

[0024] Example one

[0025] Using solid silicone rubber KE-950 with Shore A hardness of 50, plus 1% cross-linking agent DCP, mixed on a two-roll open rubber mixer at room temperature for 10 minutes to produce a 2 mm mixed rubber sheet Spare; take a metal fiber sintered felt with a thickness of 0.30mm, a square side length of 12.0cm, a porosity of 88%, and a vacuum sintered stainless steel (SUS316L) fiber with a metal fiber diameter of 0.8 microns. The fiber sintered felt is placed in a square cavity with a side length of 12.2 cm. The depth of the square membrane cavity is 0.60 mm. Put a 10g mixed rubber sheet on the stainless steel non-woven fabric, heat vulcanize and press for 10 minutes at 165℃, then take out the mold, take out the rubber sheet containing the stainless steel non-woven fabric from the mold cavity, which is the non-woven containing metal Rubber composite sheet of cloth. This sheet was punched into small discs with a diameter of 3.0 mm. This kind of small wafer can be used in the keys of mobile phones, and can be used as the contact element of the on-switch of the PCB circuit board.

[0026] Example two

[0027] Before use, the metal fiber sintered felt used in this example was treated with 2% silane coupling agent KH-550 ethanol solution (dipped or brushed), baked at 90°C for 15 minutes, and then placed in a desiccator spare. The other processing is the same as the first embodiment.

[0028] Example three

[0029] Take a metal fiber sintered felt made of stainless steel (SUS316L) fibers with a metal fiber diameter of 0.8 microns, with a thickness of 0.30 mm, a square side length of 12.0 cm, and a porosity of 80%. Place this stainless steel metal fiber sintered felt on One side is 12.2cm in a square cavity. The depth of the square membrane cavity is 0.30 mm. Put a 10 grams of freshly mixed liquid silicone rubber (Silopren? LSR2660) on the stainless steel metal fiber sintered felt, heat vulcanize and press for 20 minutes at 120℃, and then exit the mold. The stainless steel metal fiber sintered felt is contained in the cavity The rubber sheet is a rubber composite sheet containing metal non-woven fabric.