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The compounding ingredients were highly dispersible silica with cetyltrimethylammonium bromide (CTAB)-specific surface area 171 [m.sup.2]/g (Ultrasil 7005, Evonik Industries AG, Germany), treated distillate aromatic extract, or TDAE oil (Vivatec 500, Hansen & Rosenthal, Germany), zinc oxide (Global Chemical, Thailand), stearic acid (Imperial Chemical, Thailand), polymerized 2,2,4-trimethyl-1,2-dihydroquinoline or TMQ, diphenylguanidine or DPG and N-cyclohcxyl-2-benzothiazolesulfenamide or CBS (all from Flexsys, Belgium), and sulfur (Siam Chemical, Thailand).
Materials % (phr) NBR 100.00 Stearic acid 1.0 Zinc oxide 4.0 DOP (dioctyl phthalate) 5.0 CBS (N-ciclohexyl-2-benzothiazyl sulfenamide) 1.0 Sulfur 1.5 DPG (Diphenylguanidine) 1.5 Fillers 0, 10, 20, 30, 40 Table 2.
One cure package consisted of 1.4 phr of RM sulfur, 1.7 phr of n-cyclohexyl-2-benzothiazolesulfenamide (CBS) and 2.0 phr of diphenylguanidine (DPG).
The vulcanization system most frequently used in ethylene acrylic elastomers (AEM) compounds is a combination of HMDC (hexamethylenediamine carbamate) with DOTG (dio-tolylguanidine) or DPG (diphenylguanidine).
Polymerized 2,2,4-trimethyl-1,2-dihydroquinoline (Flexol TMQ) and N-isopropyl-N'-phenyl-p-phenylenediamine (Santoflex IPPD) antioxidants and the accelerators N-cyclohexylbenzo-thiazole-2-sulfenamide (Santocure CBS), N-t-butylbenzothiazole-2-sulfenamide (Santocure TBBS), diphenylguanidine (Perkacit DPG) and tetramethylthiuram disulfide (Perkacit TMTD) are commercial products of Flexsys America.
The most frequently used vulcanization system used in AEM compounds is a combination of HMDC (hexamethylenediamine carbamate) with DOTG (di-o-tolylguanidine) or DPG (diphenylguanidine).
To illustrate the properties of compound 1, comparative data are presented in table 11, where MBT has been replaced with diphenylguanidine (DPG) and cylohexylbenzothiazole sulfenamide (CBS) at equal phr.
%) 11.2 11.2 Microcrystalline wax 1.0 1.0 Paraffin wax 0.5 0.5 Santoflex 13 antiozonant 2.5 2.5 Stearic acid 3.0 3.0 Productive Wingstay 100 0.5 0.5 Zinc oxide 2.5 2.5 Santocure CBTS 2.0 2.0 Diphenylguanidine 1.6 1.6 Sulfur 1.7 1.7 Table 10--summary of compound testing in selected areas of cure, processing and hysteresis Carbon black Cure SSBR A SSBR-B ODR Min.
diphenylguanidine, in blends of Exxpro and dienes can contribute to bin storage problems.
Under the new legislation, the following accelerators, will be imported duty-free into the U.S.: tetramethylthiuram monosulfide, ethylene thiourea, diphenylthiourea, dibutylthiourea, dipentamethylenethiuram tetrasulfide, N-nitroso diphenylamine diphenylguanidine, di-o-toly-guanidine, and N, N dicyclohexyl-2-benzothiazolesulfenamide.
Kagechika, N-Methylated Diphenylguanidines: Conformations, Propeller-Type Molecular Chirality, and Construction of Water-Soluble Oligomers with Multilayered Aromatic Structures, J.