Nitrocellulose mixtures preparation

Place 170 grams of ozokerite wax into a 500-milliliter beaker and then heat to 90 Celsius to melt the wax. After the wax has melted, add 2 grams of dry lecithin. Afterwards, raise the temperature to 110 Celsius. Then, rapidly stir the molten mixture at 110 Celsius for 90 minutes. After 90 minutes, cool the mixture to 90 Celsius. Then prepare a nitrocellulose mixture by mixing 186... 

Manufacture of nitrocellulose pi wdcr The dehydration of nitrocellulose Dehydration with centrifuges Dehydration in presses RcL tification of alcohol from dehydration The preparation of nitrocellulose mixtures Partial dissolution of nitrocellulose Shaping the dough Predrying Solvent recovery... 

Sulfuric acid cannot be used for the synthesis of acetals and so bis(2,2-dinitropropyl)acetal (179) is prepared from the reaction of paraldehyde with 2,2-dinitropropanol (25) in the presence of boron trifluoride.333 323 50 50 eutectic mixture of bis(2,2-dinitropropyl)formal (175) and bis(2,2-dinitropropyl)acetal (179) has found use as an energetic liquid plastisizer for nitrocellulose. 

T. Urbanski [74] prepared this substance by the nitration of the dinitrodimethyl-diamide of tartaric acid with a mixture of nitric acid and acetic anhydride at a temperature below — 2°C. It is capable of gelatinizing nitrocellulose. 

Nitrocellulose of 14.04% nitrogen was obtained by Berl and Ruff [2], when they nitrated cellulose with a mixture of nitric and phosphoric acid. Later Dalmon [3] has prepared nitrocellulose containing 14.12% of nitrogen by treating cellulose with gaseous N2Os. 

Using the ultracentrifuge sedimenting method, Gralen and Svedberg [40] have determined the molecular weight of nitrocellulose prepared from various types of cellulose. The nitration was carried out at 0°C by means of a mixture composed of 40% of nitric acid, 40% of phosphoric acid, and 20% of phosphorus pentoxide. The results are collected in Table 79. 

T. Urban ski and Siemaszko [75] examined the nitration of cellulose with N02C1 in the vapour phase. Gaseous N02C1 was drawn through cellulose at 20°C for 4 hr, and the nitrocellulose than subjected to the usual treatment. A product with 12.2%N was obtained with 168% yield. The product does not contain chlorine. Its stability is higher than that of nitrocellulose of the same nitrogen content prepared by means of the usual nitrating mixture. 

Composition D-2, This composition consists of a mixture of desensitizing wax 84, lecithin 2 Nitrocellulose 14%. It is prepared by melting mixing the ingredients in the above amounts When the mixture is uniform and free from any visible impurities, it is cast in the form of slabs not more than 2 inches thick, or in the form of pellets not more than 2 "x 2 " in size. Composition D-2 is used to emulsify desensitize solid explosives or mixtures of explosives. The detailed US Military requirements of Composition D-2 are given in Ref 2, where the tests are also described... 

The second successful dense smokeless powder was the ballistite which was invented by Alfred Nobel.6 This was a stiff gelatinous mixture of nitroglycerin and soluble nitrocellulose in proportions varying between 1 to 2 and 2 to 1, prepared with the use of a solvent which was later removed and recovered. Nobel appears to have been led to the invention by thinking about celluloid, for the patent specification states that the substitution of almost all the camphor in celluloid by nitroglycerin yields a material which is suitable for use as a propellant. In the method of manufacture first proposed, camphor was dissolved in nitroglycerin, benzene was added, and then dry, pulped, soluble nitrocellulose the mixture was kneaded, the benzene was allowed to evaporate, and the material was rolled between warm rollers... 

Using LTC4 as substrate, nitrocellulose filters (0.2 pm pore size, 25-mm diameter) are soaked in incubation buffer (0.25 mM sucrose, 10 mM Tris-HCl, pH 7.4). A rapid filtration apparatus from Millipore (Bedford, MA) is prepared. A final volume of 110 pi of transport assay mixture (4 mM ATP (potassium salt), 10 mM creatine phosphate (Tris salt), 10 mM MgCl2, 10 mM Tris/HCl (pH 7.4), 5 mM glutathione (reduced), 0.25 mM sucrose, 100 pg/ml creatine phosphokinase (2 units/110 pi), 50 nM 3H-LTC4 (50 nCi/110 pi) pH 7.4) is preincubated at 37 °C for 1 min. Blanks are prepared by replacing ATP by 5 -AMP. 

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