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Thioureas .

Feb 26, 2019

Other new varieties of accelerators Currently, new types of accelerators are being researched to obtain accelerators with high efficiency of vulcanization, good processing safety, good resistance to reversion and high aging resistance. In addition, the variety of sulfur donors has gradually increased, and non-sulfur cross-linking systems have emerged. Moreover, it has been recognized that toxic promoters such as ethylene thiourea are being Naikkaten..

(1) Triazine Promoter Ti kapatgan kadagitoy ket ti bis(2-ethylamino-4-diethylaminotriazinyl-6) disulfide, a mangitandudo iti nangatngato a potensia ngem dagiti gagangay nga accelerators{4}} a napartak ken natalged a maproseso. ti {3 a banag iti nagbaetan ti accelerator ket no maipapan iti 2 a 2 a 2 a 2 a 2 a 2 a banag ket kapada ti accelerator a saan a maproseso ti 2. ket bassit, iti kaso ti panaglaon ti 1.5 aginggana ti 2.35 a paset ti natural a goma, 0.3 laeng a paset ti mabalin nga usaren imbes a 0.5 a paset ti sulfenamide. Ti accelerator ket mabalinna a pasayaaten ti anti-reversion a tagikua ti sulforaphane iti nababa a dosis ti asupre, ken mabalin nga usaren iti styrene-butadiene rubber, isoprene rubber ken butyronitrile.

(2) Promoters such as thiocarbamoyl sulfenamide are mainly N-oxydiethylenethiocarbamoyl-N-oxydiethylene sulfenamide, which has high safety and vulcanization speed. Fast, the promotion is great. Suitable for styrene butadiene rubber, nitrile rubber, EPDM rubber and other general synthetic rubber. The compound used in an amount of 0.67 parts was vulcanized faster than 1 part of the sulfonyl accelerator. And can get satisfactory operational safety performance. The activity above 149℃C is very large, while below 149℃C can be added a small amount of accelerator NOBS, M or DM. (3) Thiophosphoryl accelerator bis(diethylthiophosphoryl) trisulfide This accelerator can be used as a sulfur donor in natural rubber. When part or all of the sulfur is replaced, the heat resistance of the vulcanizate can be improved, and the reversion property and compressive deformation property can be improved at the time of high temperature vulcanization. It is an excellent accelerator in EPDM rubber, safe in operation, Napardas iti bulkanisasion, nagsayaat iti resistensia ti pudot, saan a panagsabong, ken nagsayaat iti compression set resistance. daytoy ket naiduma manipud kadagiti adu a dadduma pay nga accelerators ken dagiti asupre ken asupre a donasion iti daytoy ket saan a mangpataud ti pannakadadael dagiti polyester a lanot a maikontak iti goma.


Ipatulod ti saludsod .