The invention provides a
coating-type binder used for bounding
nitrile butadiene rubber and a
metal framework and a preparation method. The binder is prepared from a composite binder, rubber and an auxiliary agent; wherein the composite binder consists of a main binder and an auxiliary binder which become A component, the main binder consists of
cobalt boracyl 23 and
cobalt neocaprate, and the auxiliary binder is a composite organic salt containing
nickel and
vanadium; the rubber is
nitrile butadiene rubber; the auxiliary agent consists of an age resister, a
plasticizer, a strengthening agent, a loading agent, an accelerator, a activator and a vulcanizing agent which are of conventional use in rubber product production, A component is dispersed in
rubber material and coordinates with the age resister, the
plasticizer, the strengthening agent, the loading agent, the accelerator, the activator and the vulcanizing agent to constitute binding master batch B; the binding master batch B is dissolved by
solvent of oil to prepare the
coating-type binder of the invention. The
coating-type binder of the invention not only maintains various excellent properties of the primary direct adding type
cobalt salt binder such as high strength bonding,
ageing resistance and the like, but also can be used in a coating way like imported coating binder product, thereby having obvious using effect.