Document jyYoy4DeDJo8Kmma18yKMe9OO

-5~ K YAE LOO Cont. #164 - Cont versus special oils* The following observations were noted: 1. Comparatively bad cheeking and dirt collection were found on panels using the soya P E ester, ARY 1984 and also a 60/40 raw soya, (418) - lastolene combination replacing the oils in Rex 471 Pittsburgh Plate Glass Company*^ extracted soybean oil, F 5 X L also tends toward excessive dirt collection 2 Other special oils examined, namely AEY 1979 - Castor-Soya P E Ester, ARV 1981, - Soya P E Ester, AKY 1987 - Linseed P* E Ester, and ARY 1988 - Linseed P E* Ester gave at least as good . results as the Rex 471 formula used as the guide. This was the regular formula -ajf 7-19-40 3. Both oo-fumed and mechanically mixed leaded sine combined with mica gave poor results with AW 1999, a Linseed P* E* Ester, as to cheeking ansi dirt retention, worse than the regular pig mentation o Rex 471 with this same oil 4 Generally speaking, no shortcomings appear to be traceable direotly to the castor oil, but some definitely appear to be due to the use of soybean oil. #86 - Durability of Pigments with Special Deference to Leaded Zinc and Efaite Lead A bulletin, EC 68, subject "Durability and Tint Reten tion of Lead-Zinc House Paints as Influenced by Lead Titanate or EonChalking TiOg" was prepared during the month This report brought up to date the findings published in Research Bulletin BC 64, of 8-25-41* and now brings up the comparisons of exposures to 16 months* Funda mentally the comparisons cover two types of pigmentation, as follows: . Formula A Formula B 10$ Basie Lead Carbonate or Sulfate 45% Leaded Zinc 35/65 20% Asbestine 25$ Lead Titanate 10$ Basie Lead Carbonate or Sulfate 46$ Leaded Zinc 35/65 l^S Eon-chalking Titanium Oxide 30$ Asbestine In general, the type A formulation is superior as to dirt retention, and is more resistant to checking than Formula B* Formla A, having less chalking tendency than B, in many oases does net present as good general appearance, because of excessive dirt collection The exposures include a number of subdivisions in which it is again N12527 ( -6- M. VAN LOO Cento $86 - Conto confirmed that co-flamed leaded zincs are superior to mechanically mixed leaded zincs as t.o durability .For details, see report. filjL Exterior Printers In further studies of crawling, our work has been hampered by difficulties in inducing crawling on the control, or regular Hex 450 tJnderc cater. However, there was an indication that Hex 450 Underooater at both 40 and 42$ PV*C* obtained by increasing the asbes tine and removing raw linseed oil from the vehicle, showed as much crawling as the regular 36.5^ p.V*C formulation. However, when a FV.C, of 40$ is obtained by replacing raw linseed oil with (348), there are indications of less crawling tendencies than with the regular material* However, body difficulties are encountered under these circumstances. #103 - Metal Protective Paints V The shortage of phenolic resins may soon force us to replace (2841)0 in the Metalasti topcoats* We have used Hex 27399 and Hex 5891 as typical members of the series and have replaced (2841)0 on the basis of vehicle solids With (48), (2325), and AH? 2536 (an ex perimental 100 gallon Dehydro! modified phenolic)* In all cases, the replacements dried in 3 to 4 hours, just as well as, or better than, the present formulation* These are going on exposure at Chicago and Miami* ' Totrust Light Grey, a product of Wilbur Williams, adver tised widely as a substitute for aluminum paints, has failed by bad checking after 6 months * exposure in Chicago* Aluminum topcoats of various types have been exposed under the-same conditions for 3 years and are still in perfect condition. Totrust Light Grey appears and performs very much like Metalastie Light Grey. It is probably" a Linseed Oil - Zinc Oxide formulation* The checking pattern is exactly the same as Metalastie Light Grey* Zinc tetroxychrornate showed up so poorly in alkyd vehicles in comparison to other zinc chromates as far as moisture re sistance w&s concerned that we feel it necessary to check the work reported by New Jersey Zinc Co* using that pigment in linseed oil* The comparisons will be made against regular aim chromate and a con servation mixture of zinc chromate and zinc oxide or leaded zinc oxide with an amount of chromate equivalent to sins tetroxychrornate The idea of conserving chromates by Bchromatising" pigments, sine oxides, or white lead is generally considered to be one } 0007-SWP-000006878 f t #105 ~ Synthetic Bulletin Colors A aeries of panels from Cleveland comparing the (2159) type with the new (6128) + (5) formula have shown them to be nearly equal after1 4 months* exposure at the Chicago farm. Differences in favor of one or the other were fairly well balanced. Five representative colors were included in this series. #83 - Durability of Pigments with Special Reference to Leaded Zinc and White Lead Further improvement has been made by the Pigment Division in the production of 414 ?<f The brightness has been improved considerably and therefore the potential field of usage has been expanded considerably. The original grayness and redness has been practically eliminated and a i good white with a yellow cast produced. Formulators are urged to utilize 414 Iff to the fullest extent possible. Exposures were put out during the month on paints contain ing low amounts of basic carbonate white lead or no carbonate. At the time these paints were formulated, there appeared the possibility of reduction in lead available. The TIOs was limited to 40 pounds, and leaded zinc introduced as 412, 1523, and 414 1. Zinc oxide ratios go up to 5056, and attempts were made to counterbalance checking tendencies by introducing mica. the month? No work done on the following investigations during #148 - Examination of Shite-Lead #160 - Painting Bricks #164 - Reformulation Studies of House Paint to Reduce Dirt Collection #165 - One Coat House Paint - Discontinued 0007-SWP-000006879 --?