| 摘要 |
PURPOSE:To obtain a material for a gasket useful for a cylinder head, etc., having improved oil resistance and anti-freeze resistance, by crushing expanded graphite into granules, blending it with an organic binder, an inorganic filler, and a rubber chemical in a specific composition. CONSTITUTION:(A) 20-70wt% granular expanded graphite obtained by crushing expanded graphite, having 0.008-0.40g/cm<3> bulk density, passing 100% through 5mm. sieve is blended with (B) 3-10wt%, preferably 5-8wt% organic binder (preferably NBR, etc.), (C) 20-70wt%, preferably 25-65wt% inorganic filler (preferably a mixture of clay and talc of 2:1), and (D) <=2wt% chemical rubber (e.g., sulfur, etc.), to give the desired material for gasket. The component A prepared by collecting remaining material of punching of gasket obtained by applying expanded graphite sheet to both sides of core material is advantageous in terms of cost.
|
