NBR compound for MBB application
NBR compound for MBB application
(OP)
Hello
I'm having problems to get MBB standard like DBL 5563-21 just in elongation at break like the results below:
1000h@100°C ageing in air
change in Hardness (+18 Shore A max) - +16 Shore A
Tensile at break (7 MPa min) - 13,5 MPa
Change in tensile (30% max) - -7,3%
Elongation at break (160 % min) - 120%
Change in elongation (50 % max) - -62,4%
This is the compound formulation i'm already using:
NBR with medium ACN - 100
ZnO - 4,0
Stearic Acid - 1,5
Antiozonant Wax - 2,0
IPPD - 2,0
TMQ - 1,0
ZMTI - 2,0
Carbon black N762 - 52
Carbon black N330 - 10
TP 759 plasticizer - 4,0
Sulphur - 0,3
TMTD - 1,0
CBS - 2,0
ZDBC - 1,5
DTDM - 2,2
WB 16 - 2,0
the MBB normally tests the final part laminated too and this is a problem.
If anybody can help me i will appreciate so much.
Thanks in advance
I'm having problems to get MBB standard like DBL 5563-21 just in elongation at break like the results below:
1000h@100°C ageing in air
change in Hardness (+18 Shore A max) - +16 Shore A
Tensile at break (7 MPa min) - 13,5 MPa
Change in tensile (30% max) - -7,3%
Elongation at break (160 % min) - 120%
Change in elongation (50 % max) - -62,4%
This is the compound formulation i'm already using:
NBR with medium ACN - 100
ZnO - 4,0
Stearic Acid - 1,5
Antiozonant Wax - 2,0
IPPD - 2,0
TMQ - 1,0
ZMTI - 2,0
Carbon black N762 - 52
Carbon black N330 - 10
TP 759 plasticizer - 4,0
Sulphur - 0,3
TMTD - 1,0
CBS - 2,0
ZDBC - 1,5
DTDM - 2,2
WB 16 - 2,0
the MBB normally tests the final part laminated too and this is a problem.
If anybody can help me i will appreciate so much.
Thanks in advance





RE: NBR compound for MBB application
One hopes that reduced stiffening will be accompanied by a smaller change in EB.
RE: NBR compound for MBB application
I will make this changes and do some tests...
What do you think about the ACN content ?? With higher teor its better for heat ageing is that all rigth ?! what do you think about blends ?
My problem is that the customer tests in the final test piece (laminated) and normally the results is always worse than in the test specimens.
RE: NBR compound for MBB application
Heat ageing resistance should increase with ACN content simply because there are fewer butadiene units susceptible to oxidation and oxidative crosslinking. That is borne out by the following recently published paper : Richard J. Pazur, J. G. Cormier, K. Korhan-Taymaz (2014) THE EFFECT OF ACRYLONITRILE CONTENT ON THE THERMO-OXIDATIVE AGING OF NITRILE RUBBER. Rubber Chemistry and Technology: March 2014, Vol. 87, No. 1, pp. 53-69. The lower permeability to air should also be beneficial. I am not familiar with the MBB specification but if NBR is being used for properties such as fluid resistance or damping, a change in grade might cause more problems than it solves. The same applies to blends. I think you have to consult an NBR supplier on that one.
It goes almost without saying that the compound should be fully cured ( ie 95%) to ensure no additional crosslinking during ageing.
Happy New Year