Fluororubber composition, method for producing the same and fluororubber crosslinked molded article

Patent metadata

Field	Value
Publication number	US-11613612-B2
Application number	US-201816623909-A
Country	US
Kind code	B2
Filing date	Jun 28, 2018
Priority date	Jul 5, 2017
Publication date	Mar 28, 2023
Grant date	Mar 28, 2023

Abstract

A fluororubber composition that is a kneaded mixture of a carbon nanotube masterbatch comprising 4 to 20 parts by weight of multilayer carbon nanotubes, which are fibrous carbon nanostructures that do not contain monolayer carbon nanotubes, based on 100 parts by weight of a fluororubber polymer, and a fluororubber raw material comprising at least a fluororubber polymer and a reinforcing filler, in which the multilayer carbon nanotubes are compounded in an amount of 0.5 to 6 wt. % in the kneaded mixture. The kneading is performed using a roll or a kneader when the fluororubber composition is produced. The fluororubber composition can provide a fluororubber crosslinked molded article that exhibits abrasion resistance and blister resistance.

First claim

The invention claimed is:

1. A method for producing a fluororubber composition that is formulated and compounded to form crosslinked molded sealing materials that are resistant to abrasion and blistering which method comprises:
providing kneaded masterbatch comprising 4 to 20 parts by weight of multilayer carbon nanotubes, which are fibrous carbon nanostructures that do not contain monolayer carbon nanotubes, based on 100 parts by weight of a fluororubber polymer;
providing a fluororubber raw material comprising at least a fluororubber polymer and a reinforcing filler; and
kneading the masterbatch and the fluororubber material together to form a kneaded fluororubber composition in which the multilayer carbon nanotubes are compounded in an amount of 0.5 to 6 wt. %, wherein kneading is performed using a roll or a kneader.

2. The method for producing a fluororubber composition according to claim 1 , wherein an open roll having a pair of rolls, which are arranged at 0.7 to 1.5 mm roll interval, is used.

3. The method for producing a fluororubber composition according to claim 2 , wherein kneading is performed using a roll at a temperature of 60 to 100° C. or using a kneader at a temperature of 100 to 200° C.

4. The method for producing a fluororubber composition according to claim 1 , wherein as the fluororubber raw material, one being previously formed as a rubber compound using a kneader is used.

5. The method for producing a fluororubber composition according to claim 4 , wherein kneading is performed using a roll at a temperature of 60 to 100° C. or using a kneader at a temperature of 100 to 200° C.

6. The method for producing a fluororubber composition according to claim 1 , wherein kneading is performed using a roll at a temperature of 60 to 100° C. or using a kneader at a temperature of 100 to 200° C.

7. The method for producing a fluororubber composition according to claim 1 , wherein the reinforcing filler comprises carbon black.

Assignees

• Nok Corp

Inventors

• Murakami Hideyuki
• Abe Shunsuke

Classifications

• C08J3/203

  Solid polymers with solid and/or liquid additives · CPC title

• F16J15/3284

  characterised by their structure; Selection of materials · CPC title

• C08K3/041

  Carbon nanotubes · CPC title

• C08J3/226

  using a polymer as a carrier · CPC title

• C08J3/243

  Two or more independent types of crosslinking for one or more polymers · CPC title