Sulfur formulation

The present paper deals with certain separations that have been accomplished thus far and gives a detailed procedure for the determination of DDT and 7-benzene hexachloride in DDT-benzene hexachloride-sulfur formulations. 

Determination of 7-Benzene Hexachloride and DDT in Benzene Hexachloride-DDT-Sulfur Formulations... 

Accelerated sulfur formulations are the most common vulcanisation systems used in commercial and industrial applications. Therefore, research on both the fundamental and applied aspects of accelerated sulfur vulcanisation is ongoing. Several reviews of the chemistry and/or physics of accelerated sulfur-vulcanisation of elastomers have been published [13, 14, 22, 23]. 

However, these interesting results could not be extended to the most usual sulfur vulcanization, since the mechanism of this curing process is very complicated and not yet well understood Experiments with typical sulfur formulations have shown (Figs. 14—19 and Ref. ) that both SBR and IR can covulcanize with EPTMs... 

Figure 2 (top). Dry-stacking the block to build the walls. Figure 3 (middle). Grouting the steel door frames to the block with the sulfur formulation. Figure 4 (bottom). Forming the window sill with the sulfur formulation. 

A room divider wall of cinder block was stacked after the outer walls were completed. The walls and the partition were then surface-bonded. Figure 6 shows a workman spraying the sulfur formulation to surface-bond the blocks. Both the inside and the outside walls of the building were sprayed, each with two coats of formulation. 

After the building was surface-bonded, a 2 X 8-in. wood plate was bolted to the top of the walls. The bolts for the plate were set into the top of the wall by setting them in sulfur formulation poured in the top of some of the blocks. To accomplish this, newspaper was crumpled and inserted in the top block to a depth of 6 in. and the formulation was poured in around the bolt. 

Figure 6. Spraying the sulfur formulation on the cinder block walls...

Figure 7. Spraying the ceiling panels with the sulfur formulation...

Results. The cinder block surface-bonded by spraying with the sulfur formulation gave a structurally sound building. The pertinent data for this process are given in Table I. 

In addition to spray surface-bonding the building, an additional 2090 lb of the sulfur formulation was used to construct the building. A summary of these uses is given in Table II. 

In addition to surface-bonding the block building, physical properties of the sulfur formulation were investigated. Previous work (1) had determined that the formulation is practically odorless on curing, that it is fluid enough to spray and will bond without dripping and that it is fire retardant. 

To determine how long the sulfur formulation could be held in a molten state before spraying, its stability was measured on holding at 135 and 180 °C. Stability was indicated by the hardness and impact strength of solidified samples taken at timed intervals. Molten formulation held at 135 °C for over 2 months did not deteriorate. At 180 °C, decomposition was noted after 30 days, and the material solidified into a black, friable mass after 45 days. This was attributed to carbonization of the mixture by dicyclopentadiene decomposition. 

Porous Mixes. Specific aggregate-asphalt-sulfur formulations in which sulfur adds to the mix strength may be used for porous construc-... 

More recendy, molecular molybdenum-sulfur complexes and clusters have been used as soluble precursors for M0S2 in the formulation of lubricating oils for a variety of appHcations (70). Presumably, the oil-soluble molybdenum—sulfur-containing precursors decompose under shear, pressure, or temperature stress at the wear surface to give beneficial coatings. In several cases it has been shown that the soluble precursors are trifunctional in that they not only display antifriction properties, but have antiwear and antioxidant characteristics as weU. In most cases, the ligands for the Mo are of the 1,1-dithiolate type, including dithiocarbamates, dithiophosphates, and xanthates (55,71). 

For increased solubiHty to prevent bloom, shorter-chain carboxyHc acids or zinc carboxylates can be substituted. The use of chain-branched carboxyHc acids reduces the tendency for the formulations to lose sulfur cross-links or revert upon prolonged heating (7). Translucent articles such as crepe soles can use a zinc carboxylate or employ zinc carbonate as a transparent zinc oxide. 

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