| 摘要 |
A fast curing vulcanizable multi-part rubber compound comprising: (1) a first rubber compound comprising: (a) an elastomer, and (b) at least one vulcanizing agent, this first rubber compound having a ts2 value of at least 1.5 minutes when measured at 190° C.; (2) a second rubber compound comprising: (a) an elastomer, and (b) at least one cure accelerator, this second rubber compound having a ts2 value of at least 1.5 minutes when measured at 190° C.; and (3) one or more optional additional rubber compound comprising (a) at least one elastomer, this optional additional rubber compound having a ts2 value of at least 1.5 minutes when measured at 190° C.; wherein: at least one elastomer selected from the group consisting of the elastomer (1)(a), the elastomer (2)(a) and the elastomer (3)(a) has a Mooney viscosity in the range of 20-75, preferably 20-50, and more preferably 30-50, as measured at 100° C. in accordance with ASTM D1646, the first rubber compound, the second rubber compound and the optional additional rubber compound are kept separate from each other until the fast-curing vulcanizable multi-part rubber compound is used, a blend of equal volume parts of the first rubber compound and the second rubber compound, optionally with an equal volume part of the optional additional rubber compound, has a ts2 value of less than 0.7 minutes, each ts2 value being measured with an oscillating disk rheometer (ODR) in accordance with ASTM D2084. A process is also provided for blending, injection molding and curing of a rubber compound, comprising the steps of: (a) feeding simultaneously streams of a first rubber compound, a second rubber compound, and optionally one or more additional rubber compound into an injection chamber of an injection press where the streams of rubber are combined; (b) injecting the combined streams of rubber from the injection chamber at a pressure of at least 10,000 psi into a motionless mixer provided downstream of the injection; and (c) feeding the blended rubber stream into a mold provided downstream of the motionless mixer,
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