Method for producing low friction fluorine rubber crosslinked body
AssigneeNok Corporation
InventorsToshihiro Higashira, Hiroyuki Sano
Life of this patent
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Abstract
A fluororubber composition includes a polyol-crosslinkable fluororubber, a crosslinking accelerator, a polyol crosslinking agent and calcium hydroxide, with the crosslinking accelerator having a specific weight ratio relative to the polyol crosslinking agent, and is heat treated under specific conditions to give a low-friction fluororubber crosslinked product that is well balanced and excellent in properties such as low frictional properties, low tackiness and low resilience properties and that is favorably employed as rubber vibration insulators and impact-absorbing stoppers represented by HDD stoppers.
Claims13
A process for producing a low-friction fluororubber crosslinked product, comprising:
- preliminarily polyol crosslinking a polyol-crosslinkable fluororubber composition according to need, the composition comprising a polyol-crosslinkable fluororubber in combination with a crosslinking accelerator, a polyol crosslinking agent, calcium hydroxide and optionally magnesium oxide, wherein the crosslinking accelerator has a weight ratio (R) to the polyol crosslinking agent (crosslinking accelerator/polyol crosslinking agent) in the range of 0.9 to 5;
- and
- heat treating the fluororubber composition at a temperature in the range of 150 to 300° C. for 0.1 to 48 hours to produce a low-friction fluororubber crosslinked product having a surface frication coefficient of less than 1.
A fluororubber composition capable of giving a crosslinked product by heat treatment that is used as a stopper in hard disk drive, the composition comprising a polyol-crosslinkable fluororubber, a polyol crosslinking agent and a crosslinking accelerator, wherein the polyol crosslinking agent is contained in an amount of 0.4 to 20 parts by weight per 100 parts by weight of the polyol-crosslinkable fluororubber, and wherein the weight ratio R of the crosslinking accelerator to the polyol crosslinking agent (crosslinking accelerator/polyol crosslinking agent) is in the range of 0.9 to 2.0.
Dependencies are inferred from the claim text.