The invention relates to the technical field of a functional
fiber master batch and a preparation method thereof, in particular to a reinforced short
fiber master batch for a rubber transmission beltand a preparation method. The master batch is prepared from modified
aramid short fibers, a
polyolefin elastomer, rubber, a
coupling agent, aromatic oil, a reinforced modified filling agent, a
plasticizer and an antiager. The preparation method comprises the steps that the
aramid short fibers are soaked in a
metal hydroxide solution and then soaked in a soluble
silicate solution, through repeatedwetting, the
aramid short fibers with the surfaces wrapped by hard
silicate shell
layers are formed, dispersed in the
coupling agent and subjected to standing, then other raw materials are added for refining, a
rubber material is prilled through a twin-screw extruder, and the reinforced short
fiber master batch for the rubber
transmission belt is obtained. According to the reinforced short fiber master batch, the problems of poor
interface bonding and low
heat resistance of the aramid short fibers and a rubber matrix during rubber reinforcement in the prior art are solved, and the reinforced short fiber master batch has the advantages of being even in dispersion, high in bonding force, tensile strength and
bonding strength and long in service life.