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In industrial utilization of FKM, combination
of FKM and NBR may be required though FKM is difficult to adhere
to NBR.
In this case, ZEONET® PB exhibits remarkable improvement of adhesion
between FKM and NBR under their cross-linking process. In this
procedure, ZEONET® PB is applied not to FKM but to NBR for its
curing system.
ZEONET® PB is compatible with any type of cross-linking system
for FKM, such as poly-ol, amine or litharge system. For NBR cure,
both curing agent of sulfur and peroxide are applicable to this
coupling method by ZEONET® PB.
ZEONET® PB is also effective for adhesion of FKM and ECO.
Tested rubber
FKM: Viton® VTR9160
PVC modified NBR: Nipol® DN508
Applied curing recipe
| FKM |
| Viton® VTR9160 |
100 |
| Bisphenol F |
Originally contained in Viton® VTR9160 |
| MgO |
6 |
| Ca(OH)2 |
6 |
| Carbon black: N762 |
15 |
| PVC modified NBR |
| |
Sulfur cure |
Peroxide cure |
| Nipol® DN508 |
100 |
100 |
| ZnO#1 |
5 |
5 |
| Stearic acid |
1 |
1 |
| Carbon black: N990 |
30 |
30 |
| Nipsil VN3 |
15 |
15 |
| Thiokol TP95 |
15 |
15 |
| A.O.224 |
2 |
2 |
| Wax |
2 |
2 |
| Sulfur |
1.5 |
- |
TMTD
|
0.5 |
- |
| MBTS |
1.5 |
- |
| Percumil D-40 |
- |
2 |
Adhesion test result
| NBR cure system |
Sulfur |
Peroxide |
| ZEONET® PB
for NBR cure |
0 |
3PHR |
0 |
3PHR |
| Failure mode
at peeling test |
A.F. |
M.B. |
A.F. |
M.B. |
A.F.: Adhesive Failure (failure at interface of
FKM and NBR layers)
M.B.: Material Break
Effect of ZEONET® PB on mechanical
properties of cured NBR
| NBR cure system |
Sulfur |
Peroxide |
| ZEONET® PB
for NBR cure |
0 |
3PHR |
0 |
3PHR |
Mooney Scorch
@125 degrees C t5 (min.) |
16.2 |
4.8 |
11.4 |
9.7 |
Tensile
properties |
Tensile Strength (MPa) |
15.6 |
17.2 |
16.4 |
17.3 |
| Elongation (%) |
420 |
190 |
280 |
470 |
| 100% Modulus (MPa) |
3.3 |
8.2 |
4.2 |
3.5 |
| Hardness (Shore A) |
71 |
77 |
37 |
44 |
Compression Set (%)
70hr.s at 100 degrees C |
47 |
67 |
37 |
44 |
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