The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 23, 2025
Filed:
Aug. 17, 2020
Zhonghao Chenguang Research Institute of Chemical Industry Co., Ltd., Zigong, CN;
Jinlong Yu, Zigong, CN;
Bo Liu, Zigong, CN;
Ziqiang Zhong, Zigong, CN;
Tingjian Zhang, Zigong, CN;
Zhongliang Xiao, Zigong, CN;
Abstract
The present invention provides a method for controlling Mooney viscosity of peroxide-cured fluororubber. The method comprises: adding an initiator solution in a continuous supplementary manner during the emulsion polymerization process of a peroxide-cured fluororubber until 5 to 10 minutes before the end of the polymerization reaction; wherein the amount of the initiator solution added initially is 0.1% to 0.5% of the total amount of the polymerization monomer dry materials, and the amount of the initiator solution continuously supplemented is 0.1% to 2% of the total amount of the polymerization monomer dry materials, based on the initiator. The present invention effectively controls the Mooney viscosity value of the peroxide-cured fluororubber within the desired range with small fluctuations by controlling the amount and the manner of addition of the initiator, thereby obtaining a peroxide-cured fluororubber with stable and controllable quality. Moreover, the present invention does not need to add a chain transfer agent, which reduces the amount of additives in the polymerization process, and meanwhile improves the reaction activity of the polymerization system, effectively shortens the time for polymerization, and is beneficial to industrialized production.