Method of producing wet master batch, wet master batch, rubber composition, and solid-liquid separating and dehydrating apparatus for wet master batch production

Patent metadata

Field	Value
Publication number	US-9932450-B2
Application number	US-201414525306-A
Country	US
Kind code	B2
Filing date	Oct 28, 2014
Priority date	Oct 31, 2013
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

Provided is a method of producing a wet master batch, including the step of: solid-liquid separating and dehydrating a coagulum slurry obtained by mixing a rubber latex with a carbon black slurry containing a carbon black dispersed in water and coagulating the mixture, the solid-liquid separating and dehydrating step including gravity filtering and vacuum filtering the coagulum slurry on a filtration filter and then pressurizing, by means of a pressurizer, the coagulum slurry on the outer peripheral surface of a drum, to thereby pressure dehydrate the coagulum slurry. Also provided is a solid-liquid separating and dehydrating apparatus for wet master batch production, which includes: a filtration filter; a filtration portion; a drum; and a pressurizer.

First claim

The invention claimed is:

1. A method of producing a wet master batch, comprising the step of:
solid-liquid separating and dehydrating a coagulum slurry obtained by mixing a rubber latex with a carbon black slurry containing a carbon black having an acid functional group of 0.2 μeq/m 2 to 3.0 μeq/m 2 dispersed in water and coagulating the mixture,
wherein, the coagulum slurry contains a coagulum having a particle size at 90 volume % (D90) of 40 μm to 1000 μm, the solid-liquid separating and dehydrating step comprises gravity filtering and vacuum filtering the coagulum slurry on a filter and then pressurizing, by means of a pressurizer, the coagulum slurry on the outer peripheral surface of a drum, to thereby pressure dehydrate the coagulum slurry.

2. The method of producing a wet master batch according to claim 1 , wherein the filter is a belt-like filter cloth, the solid-liquid separating and dehydrating step is carried out on a single filter, and the filter runs in a circulated manner.

3. The method of producing a wet master batch according to claim 1 , wherein a solid obtained through the solid-liquid separating and dehydrating step has a moisture content of 40 mass % to 65 mass %.

4. The method of producing a wet master batch according to claim 1 , wherein a solid obtained through the solid-liquid separating and dehydrating step is in a sheet shape or in a strip shape each having a thickness of 0.5 mm to 3.0 mm.

5. The method of producing a wet master batch according to claim 1 , wherein the filter has an air permeability of 10 cm 3 /(cm 2 ·sec) to 200 cm 3 /(cm 2 ·sec).

6. The method of producing a wet master batch according to claim 1 , wherein the filter is made of a material being polypropylene or polyethylene terephthalate.

7. The method of producing a wet master batch according to claim 1 , wherein the filter is woven in a twill weave or satin weave.

8. The method of producing a wet master batch according to claim 1 , wherein the filter is woven by yarn in the form of monofilament or multifilament.

9. The method of producing a wet master batch according to claim 1 , wherein the filter has a thickness of 0.4 mm to 0.8 mm.

10. The method of producing a wet master batch according to claim 2 , wherein the filter runs at a running speed of 0.5 m/min to 3.0 m/min.

Assignees

• Bridgestone Corp

Inventors

• Yanagisawa Yasuto

Classifications

• B01D33/646

  by pressure rollers · CPC title

• B01D33/35

  with multiple filtering elements characterised by their mutual disposition ({B01D33/042} , B01D33/21 take precedence) · CPC title

• C08K3/04

  Carbon · CPC title

• C08J2307/02

  Latex · CPC title

• B01D33/04

  with filtering bands or the like supported on cylinders which are impervious for filtering · CPC title