Patent ID: 11885387
Assignee: OTIS ELEVATOR COMPANY
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  C | IPC C  F

Claim 10:
11. A method for preparing the friction material according to claim 1, comprising:
plasticating the nitrile rubber provided according to the weight ratio in the friction material;
mill-mixing the material obtained by plasticating with the remaining components provided according to the respective weight ratios in the friction material, wherein the vulcanizing agent is first added for mill-mixing, then the vulcanization activator, the promoter, the scorch inhibitor, ZnO and the optional anti-aging agent and MgO are added for mill-mixing, and then the thermoplastic phenolic resin, the plasticizer, the white carbon black and the optional filler are added, and wherein the plasticizer is added before the white carbon black and the optional filler are added;
milling-running and pre-heating the material obtained by mill-mixing; and
mold-loading, vulcanizing and heating the preheated material to obtain the friction material.