Red lead oxidation

The common acid acceptors, red lead oxide and barium carbonate, are both toxic when inhaled or ingested. They are, and should be, used in industry as dispersions in EPDM and ECO. SuppHers of red lead oxide include Polymeries, Inc., Rhein Chemie Corp., and Akrochem Co., Akron, Ohio. Barium carbonate in an ECO binder is available from Rhein Chemie Corp. and Synthetic Products Co. 

Application of protective paints consists of surface preparation of steel, priming coat and finishing coats. Wherever possible, steel should be blast-cleaned before painting. Primers thoroughly wet the metal to promote adhesion of finishing paints and carry inhibitive pigments. For example, red lead oxide will minimize the spread of rust on metal surfaces. The total thickness of fmishing coats must be at least 0.125 mm for adequate protection and life. Four coats of paint usually are necessary to achieve this. 

The red lead oxide (the tetragonal alpha modification) is obtained by slow cooling of the lead monoxide melt. The sohdified mass may contain the red alpha form of the oxide resulting from slow cooling of the melt, under an outer layer of yellow beta form that may result from the rapid cooling of the outer portion. 

Method No 325- Ignition Powder, Non-Gas-eous, Type II - Red lead oxide 84.0, Si 15.0 glycerin 1.0% [PXS-1039(Rev 2)(1946)] Method No 309. First Fire Compositions ... 

This charge was ignited by ca. 0.32 g (5 grains) of blackpowder igniter and a nitrocellulose-red lead oxide-silicon mixture. 

PETN 90-97 Pb nitrate 10-3%, to which 0.1-0.2% red lead oxide (Pb304) is added... 

A 2-1. three-necked flask is fitted with a thermometer and mercury-sealed stirrer. A mixture of 1080 g. of glacial acetic acid and 360 g. of acetic anhydride is placed in the flask, and then, with the stirrer revolving rapidly, 600 g. of dry minium is added. It is best to add the red lead oxide gradually in small portions so that it will not cake. Care should be taken that the temperature does not rise above 65°C. Toward the end of the reaction, it may be necessary... 

SYNS C.I. 77578 C.I. PIGMENT RED 105 DILEAD(II) LEAD(IV) OXIDE GOLD SATINOBRE LEAD ORTHOPLUMBATE LEAD TETRAOXIDE MINERAL ORANGE MINERAL RED MINIUM MINIUM NON-SETTING RL-95 ORANGE LEAD PARIS RED PLUMBOPLUMBIC OXIDE RED LEAD RED LEAD OXIDE SANDIX SATURN RED TRILEAD TETROXIDE... 

Lead Acetate (Sugar of Lead or Plumbous Acetate)(Bleiazetat or Bleizucker in Ger), Pb(CH,COO),. 3II1O, mw 379.35. Wh monocl Cfysts, d 2.55, mp- loses 311 0 at 75° for the anhyd salt, Pb(CHjCOO), mw 325.35 mp ca 280°. Sol in w and glycerin si sol in ale, chlf, CCl benz. Can be prepd by dissolving litharge in hot coned AcOH or by treating a mixt of lead and AcOH with air under press. Its lab method of prepn from red lead oxide (Pb O,), AcOH and chlorine is described in Ref 2... 

Lead compounds were once widely used also for paints. They were in great demand because they covered surfaces well and were available in a number of vivid colors. Among these were lead chromate (yellow), lead molybdate (reddish-orange), lead(II) oxide (canary yellow), red lead oxide (Pb304 red), and white lead, a complex lead carbonate/lead hydroxide mixture. As with other lead compounds, however, the potential health hazards of the element have greatly reduced the availability of lead-based paints. 

Lead tetrakis(trifluoroacetate), Pb(OCOCF3)4, which is prepared from red lead oxide (Pb304), trifluoroacetic acid, and trifluoroacetic anhydride [435], has very limited applications. It converts alkylbenzenes into benzylic trifluoroacetates [435] and benzene and its derivatives into phenyl trifluoroacetates [435, 449]. 

Detonating Cord. Accdg to Gorst(1957), pp 129-30, one of the varieties contains a cote of grained PETN enclosed in a cotton cloth. Another variety contains a core of mixture consisting of PETN SH)-97 St lead nitrate 10-3%, to which 0.1-0.2% of red lead oxide (PbjO ) is added... 

Stirring, and 700 g. (1.03 mole) of red lead oxide (Pt)304) is added in portions of 15-20 g. A fresh addition is made only after the color due to the preceding portion has largely disappeared, and the temperature is kept between 55 and 80°. At the end of the reaction the thick and somewhat dark solution is cooled, and the crystalline lead tetraacetate which separates is collected and washed with acetic acid. The crude product without being dried is dissolved in hot acetic acid, and the solution is clarified with Norit, filtered, and cooled. The colorless crystalline product is dried in a vacuum desiccator over potassium hydroxide in the dark and stored in the desiccator yield 320-350 g. (70-77%). 

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