The Analysis of Paints and Painting Materials

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McGraw-Hill, 1910 - Paint - 100 pages
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Page 53 - N/10 sodium thiosulphate, using starch as an indicator. Blank tests must be made. From the difference between the amounts of sodium thiosulphate required by the blanks and the determination, calculate the iodine number (centigrams of iodine to 1 g.
Page 5 - It will be found very convenient in this titration, which amounts in some cases to 600 — 700 cc., to titrate the distillate when it reaches 200 cc., and so continue titrating every 200 cc. as it distils over. If the white lead contains appreciable amounts of chlorine it is well to add some silver phosphate to the second distillation flask and not carry the distillation from this flask too far at any time. The method used by the chemists of the Navy Department is as follows: — Weigh 25 grms.
Page 54 - filtration process " be used, the alcoholic potash must be measured exactly. (It is, however, advisable to employ in either case a known volume of standard alkali, as one is then enabled to determine the saponification value of the acetylated oil or fat.) Next the alcohol is evaporated and the soap dissolved in water.
Page 3 - The filtrate from the lead sulphate may be used to test for other metals, though white lead is only rarely adulterated with soluble substances; test, however, for zinc, which may be present as zinc oxide.
Page 52 - Acid Number. — Weigh 10 g. of oil in a 200-cc. Erlenmeyer flask, add 50 cc. of neutral alcohol, connect with a reflux air condenser (or place small funnel in neck of flask), and heat on a steam bath for \ hour.
Page 27 - Roast 5 grams of the powder, digest with 25 cc of hydrochloric acid, evaporate to dryness, moisten with hydrochloric acid, dissolve in water, filter, and wash the residue; ignite the residue in a platinum crucible, add sulphuric acid and hydrofluoric acid, drive off the latter, and heat until copious fumes of sulphuric anhydride come off. Add potassium hydrogen sulphate and fuse, dissolve in water, filter from any remaining insoluble (barium sulphate), unite the two solutions, make up to 5oo cc and...
Page 51 - Drying on Glass. — Coat glass plates 3 by 4 inches with the oils to be examined, expose to air and light, and note when the film ceases to be tacky. A good oil should dry to an elastic coherent film in three days. Varying conditions of light, temperature, and moisture have such an influence on drying tests that for comparison of one linseed oil with others all samples must be run at the same time. 12. Drying on Lead Monoxide.
Page 29 - ... acetic acid. Stir until all is liquid, pour into the Erlenmeyer flask containing the lead, and rub with a glass rod until all of the lead is dissolved ; add 15 cc. of water, and titrate with tenth-normal sodium thiosulphate, using starch as indicator. A small amount of lead may escape solution at first, but when the titration is nearly complete this may be dissolved by stirring. The reagents should be mixed in the order given, and the titration should be carried out as soon as the lead is in...
Page 62 - Measure 6 cc of turpentine in a stoppered, thin-walled tube graduated to 0.1 cc (carbon tubes). Place the tube in cold water and pour in slowly a mixture of four parts of strong sulphuric acid and one part of fuming sulphuric acid. Add the acid slowly, and avoid an excessive rise in temperature. Shake the tube so as to mix the turpentine and the acid, add finally about 20 cc of the acid, stopper the tube, mix thoroughly, cool, allow to stand thirty minutes, and note the volume of un polymer i zed...
Page 58 - After vigorous shaking the acid layer is run off, and the remaining ethereal solution, containing the ethylic esters and the rosin acids, washed with water until the last trace of hydrochloric acid is removed. Fifty cc of alcohol are then added, and the solution titrated with standard caustic potash or soda, using phenolphthalein as an indicator. The rosin acids combine at once with the alkali, whereas the ethylic esters remain practically unaltered. Adopting as the combining equivalent for...

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