Smell of nitrile
Smell of nitrile
(OP)
Hi experts,
today I am looking for help.
VDA (German car producers association) has a test method for the smell of rubber parts used in the passenger compartments of cars. Method is basically: ready cured part is put to a closed container (glass or metal), the container is heated e.g. for 1 hour to 80 °C, then cooled down, opened and sniffed by test persons giving a subjective evaluation from 1 ( no smell) to 6 ("stinky").
For technical reasons the part has to be made from nitrile (NBR) and cured by a kind of sulfur system. Unfortunately all tests up to now came out with "6".
- Which types of NBR would be best (kind of emulgator etc.)?
- Other additives (plasticizer) ?
- Most important: Which sulfur cure system ? Type of accelerators ? Level of sulfur ?
Your help is very much appreciated.
Berti
today I am looking for help.
VDA (German car producers association) has a test method for the smell of rubber parts used in the passenger compartments of cars. Method is basically: ready cured part is put to a closed container (glass or metal), the container is heated e.g. for 1 hour to 80 °C, then cooled down, opened and sniffed by test persons giving a subjective evaluation from 1 ( no smell) to 6 ("stinky").
For technical reasons the part has to be made from nitrile (NBR) and cured by a kind of sulfur system. Unfortunately all tests up to now came out with "6".
- Which types of NBR would be best (kind of emulgator etc.)?
- Other additives (plasticizer) ?
- Most important: Which sulfur cure system ? Type of accelerators ? Level of sulfur ?
Your help is very much appreciated.
Berti





RE: Smell of nitrile
Also smell may come from plasticizer volatilization. You may check de type and level of plasticizer used:aromatic type plasticizer are the most comon for NBR, but they are volatile at certain temperature. If so, use a polymeric type plasticizer
Regards
Oscar Salazar
RE: Smell of nitrile
I will check first tip concerning insoluble sulfur and late adding of it.
Plastiziser is already a adipate polyester.
Will keep you informed about results.
Berti
RE: Smell of nitrile
Jim