Reference

Effect of carbon black type on vulcanizate structure and properties of rubber-ground vulcanizate systems in the presence of different accelerators

Effect of carbon black type on vulcanizate structure and properties of rubber-ground vulcanizate systems in the presence of different accelerators. Sharapova, L. N.; Chekanova, A. A.; Zakharov, N. D.; Lyapina, L. A. (YaPI, USSR).In this article, certain chemicals are used. Some of their cas registry numbers are 149-30-4 and 95-33-0 Kauch. Rezina, (11), 12-14 (Russian) 1983. CODEN: KCRZAE. ISSN: 0022-9466. DOCUMENT TYPE: Journal CA Section: 39 (Synthetic Elastomers and Natural Rubber) Section cross-reference(s): 65 The diffusion of S from compounded SKD rubber into ground SKD vulcanizates depended on the type of carbon black and activity of the vulcanization accelerator. Diffusion was lowest in SKD filled with PM-100 black, presumably due to its good adsorption and effect on vulcanization rate. The crosslink d. in the outer layer of vulcanizates filled with PM-100 depended on the accelerator, decreasing in the order Thiuram [137-26-8] > Zn diethyldithiocarbamate (I) [14324-55-1] > Sulfenamide Ts [95-33-0] > Captax [149-30-4], diphenylguanidine (II) [102-06-7]. For DG-100 black-filled SKD, the crosslink d. decreased in the order: I > Thiuram > Sulfenamid > Captax, II. The effects of carbon black and accelerator on tear strength and breaking elongation are also discussed. .

Sulfur cements, sulfur concretes and their use

Sulfur cements, sulfur concretes and their use. Parrett, Frederick William; Currell, Brian Robert (Seaton Chemical Developments Ltd., UK). Brit. UK Pat. Appl. GB 2139202 A1 7 Nov 1984, 4 pp. (English). (United Kingdom). CODEN: BAXXDU. CLASS: IC: C01B017-00. APPLICATION: GB 83-11279 26 Apr 1983. DOCUMENT TYPE: Patent CA Section: 58 (Cement, Concrete, and Related Building Materials) The plasticization of S in the manuf. of building materials from S, plasticizers, fillers, and aggregates is accelerated and higher early strength is achieved by using vulcanization accelerators as used in the rubber industry, e.g., zinc diethyldithiocarbamate (I) [14324-55-1]. Thus, S 1000, I 2.73, ZnO 5.45, and dicyclopentadiene [77-73-6] plasticizer 54.5 kg were thoroughly mixed and the coated, unplasticized S was heat-sealed in low-melting polyethylene bags. A S concrete was prepd. from 710 kg aggregate mix heated to 170° and mixed with 190 kg of the above coated S and 100 kg pulverized fuel ash filler. The mix was held 330 min at 140-145° before pouring. The resulting concrete had compressive strengths of 35-50 N/mm2 compared to 20-30 N/mm2 for compns. prepd. without the Zn compds.