Reference

Vulcanization of rubber

Vulcanization of rubber. Martyni, Tomasz; Erdman, Izydor; Sadowski, Krzysztof (Gdanskie Zaklady Chemiczne Przemyslu Terenowego, Pol.). Pol. PL 75416 20 Dec 1975, 2 pp. (Polish). (Poland). CODEN: POXXA7. CLASS: IC: C08C017-08. APPLICATION: PL 72-154853 20 Apr 1972. DOCUMENT TYPE: Patent CA Section: 38 (Elastomers, Including Natural Rubber) Natural SBR rubber 1:1 mixts. are vulcanized at 100-140.degree. in a satd. steam atm to give a foam having low sp. gr. by a compn. consisting of zinc ethylphenyldithiocarbamate [14634-93-6] 1.2, S 2.5, mixt. of Zn arom. mercaptides 1.0, and diphenylguanidine [102-06-7] 0.5 phr.

Flotation chemistry of the INCO matte separation process

Flotation chemistry of the INCO matte separation process. Tipman, N. R.; Agar, G. E.; Pare, L. (Int. Nickel Co. Canada, Ltd., Thompson, Manitoba, Can.). Flotation, Volume 1, 528-48. Edited by: Fuerstenau, M. C. AIME: New York, N. Y. (English) 1976. CODEN: 35PJAA. DOCUMENT TYPE: Conference CA Section: 54 (Extractive Metallurgy) In the title process, Cu2S is floated selectively from Ni3S2 using diphenyl guanidine (DPG) [102-06-7] as both collector and frother. Studies of the adsorption of DPG onto Cu2S and Cu surfaces revealed a cryst. surface product of Cu(DPG)2SO4.Cu(DPG)2(OH)2 [63497-27-8]. The adsorption followed Langmuir behavior up to a monolayer coverage. In the absence of DPG, a rapid adsorption of O by Cu2S in flotation pulps was obsd. The surface product was identified as insol. CuSO4.3Cu(OH)2 [1333-22-8] with the prodn. of SO42-. In the presence of DPG the oxidn. reaction appeared suppressed. The frothing properties of DPG were relatively poor. The concn. of sol. DPG required to form a froth was much higher than that required for other frothers, esp. polyglycol types. Batch flotation tests showed that DPG is a powerful and highly selective collector for Cu flotation when compared to most sulfhydryl collectors.