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1. (WO2017033472) METHOD FOR PRODUCING RUBBER WET MASTER BATCH, METHOD FOR PRODUCING RUBBER COMPOSITION, AND METHOD FOR PRODUCING TIRE

Pub. No.:    WO/2017/033472    International Application No.:    PCT/JP2016/053966
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Thu Feb 11 00:59:59 CET 2016
IPC: C08J 3/22
B60C 1/00
C08C 1/04
C08C 1/14
C08K 3/04
C08L 7/00
Applicants: TOYO TIRE & RUBBER CO., LTD.
東洋ゴム工業株式会社
Inventors: NISHIMURA, Chiya
西村 知耶
Title: METHOD FOR PRODUCING RUBBER WET MASTER BATCH, METHOD FOR PRODUCING RUBBER COMPOSITION, AND METHOD FOR PRODUCING TIRE
Abstract:
The objective of the present invention is to provide a method for producing a rubber wet master batch that serves as a starting material for a vulcanized rubber having excellent fatigue properties, low heat generation properties and tensile characteristics. A rubber wet master batch is produced by a method that comprises: a step for preparing a latex that has a magnesium content of 150 ppm or less; a step for forming a mixed liquid; and a step for obtaining a coagulum by causing coagulation of the mixed liquid. The latex contains rubber particles having a 90% volume particle diameter of 2 μm or less. The step for forming a mixed liquid comprises a step for mixing a latex and a dispersion solvent. The step for forming a mixed liquid additionally comprises a step for mixing a slurry containing a filler with a latex solution that is obtained in the step for mixing a latex and a dispersion solvent. The step for obtaining a coagulum comprises a step for separating the coagulum and a waste liquid from each other. This method for producing a rubber wet master batch satisfies the following formula I. a/b ≥ 65 (formula I) (In formula I, a represents the COD value (mg/L) of the waste liquid; and b represents the content (mass%) of the rubber fraction in the mixed liquid.)