| Anti-reversion Agent WK-901 | |
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Chemical Name: 1,3-bis(citraconimidomethyl)benzene Molecular Structure: Molecular Formula: C18H16O4N2 Molecular Weight: 324 CAS NO.: 119462-56-5 |
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| ITEM | SPECIFICATIONS |
| Appearance | Off white powder or granule |
| Melting point, initial, degree≥ | 75 |
| Melting point, final degree | 80-90 |
| Ash , % (Less or Equal) | 0.3 |
| heating loss, %(Less or Equal) | 0.5 |
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WK-901 is an antireversion agent which provides long term heat stability in sulfur vulcanized compounds by substituting stable, flexible carbon-carbon crosslinks for the sulfur crosslinks that are destroyed by reversion in the mold or during product service life. It is used in most sulfur vulcanized polymers such as NR, IR, SBR, BR or blends to provide improved reversion resistance on overcure. It is used to allow the use of higher curing temperature for improved productivity without sacrificing performance properties. It ‘s not reactive during the initial stages of vulcanization. Scorch and cure time are therefore not affected, thus to be added without making other compound or process modifications. The dosage level of WK-901 needs to be optimized based on the expected degree of reversion. The recommended dosages are as follow: Efficient to semi-efficient cure systems : 0.25 - 0.4 phr Semi-efficient cure systems : <0.5 phr Conventional cure systems : <0.75 phr High sulfur compounds : <0.75 phr Storage: Stored closely in a cool, dry, well-ventilated area. Avoid exposure to direct sunlight. Package: In 20kg paper bags with plastic inner. |
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