Document x5aVZm05KN4xgGD3nypyek86E

E. I. DU PONT DE NEMOURS & COMPANY KREBS PIGMENTS DEPARTMENT 256 VANDERPOOL STREET NEWARK, NEW JERSEY Serial No. Copy No. ^-44-62 / A^ ? --<?'4 ` --- c5.,, Period Covered: NEWARK PLANT PIGMENT COLOR RESEARCH REPORT Fisal Beport Miniature Panel Series #66 Modificationoo*fZ"in*c**XSelalalmt and Phosphate February, 1?43 - BovesOser, 1943* FILE: DATE: 143*54 10/21/44 Njaeae N37939 DUP050149736 i ,4 3 <s~/ Serial Ho. KH-44-62 Copy So* 1 Copy tot #1 * Suaerleal File 2 - Beseareb Office 3 * library File 4 * Faint laborraattoorr;y 5 - Mr* F* E. Bolton, Stearic . 6 - Imperial Chemical Industries, ltd* 8I e 9 - Hr. J. F* Baity, Wilmington (XCZ 10 * Or* 0* D Patterson, Ixp*Sta.,Wilington 11 * * 8 e 12 - Research Suggestion File (#205) 13 - * 14 - Extra * * (#405) v Final Report titles Miniature Panel Series #66 Evaluation of Ammonia Salt and Phosphate Modification of Zlne Yellow Period Covered* February, 1943 Hovember, 1943 4 DUP050149737 2 HtfROBPCTSOBt The promise shown by ammonium lmaa phosphate as & metal protective pigment opened conjecture as to the effect of ammonia end phosphate modifications of M32-B on the performance of sine yellow in. metal primers. Research suggestion #265 proposed phosphate! sine yellow In the expectation that the phosphate ion would contribute to the rust infclbiilve quality of the pigment. " Suggestion #405 recommended the ammonium salt of sine yellow to replace the potassium salt manufactured at present. Sf. . A aeries of alma yellows embodying the suggested modifications was prepared in the laboratory, based on X-232-D with-the necessary alteration in the formula to produce the followiI pigmentst 285-431 T-232-B (1554) control B----- Hi* sa'lt of` sine yellow C K*4 (*8a free) 0 Phosphate! sine yellow S "8a* salt of sine yellow (K* free) A partial evaluation of these pigments was made in the miniature panel series 66. Further evaluation was carried out in the paint laboratory exposure series 6747* C08SLP81QBIt The *884* salt and the phosphate! sine yellow demonstrated no advantage over S-232-0. In the single pigment primers, the suggested modifications were definitely inferior to the standard material; in combination with iron oxide and extender their per formance was equal to that of T-232-D. The exposure curves of the sine yellow/FeyOe/Jasperine primers indicate that the sodium free sine yellow is markedly superior to the standard Y-232-D. However, the result must be weighted by the fact that the T-232-0/Fe203/7asperine showed abnormal behavior in that previous experience demonstrated improved performance of the combination with Fe^OVfasperlne as compared with single pigment sine yellow primer; in mis ease the combination appears to have impaired the performance of T-232-0. The exposure curves of the primers exposed in this series have been plotted at me end of this report* The data have not been summarised in tabular form as the curves were believed to be self explanatory. DUP050149738 3 Yh* parti*! analysis of the modified sine yellows Is tabulated below* 985-43A > C 1 Y-(K1554) Control *aax* ss^t W4*alt (*8a free) Phosphate modification *Ba* salt 1_>3 3.3P 0.14 0.83 0.71 2. SI .X the high chloride content of the sodium salt makes question** able the evaluation of that sample. Its poor behavior may be Inherent or may be due to the abnormally high content of corrosive containment. mmvmm mum* The following primers were ground in one half pint ball mills with steel ballet i Primer 958-70A B C 0 f 6 a z s 958-43A, Y-232-D Control B, bRHab salt. C, K salt (Ha free) B, Phosphate 1/lodlflcation S. BNa salt 958-43A?Pe|03/Jasperine fl/ * E/ Fa03/Jasperlne 100 ft ft a 60/20a /20 a ft 50/50 In every case the pigment volume was 4.0$ In KV-15 (50/50 alkyd/ B.L.O.). Duplicate l9 x 3* cold rolled steel panels were sanded and solvent wiped then coated with the test primers using the *Bry Brush Technique9, (0.2 mil dry film), The exposure was carried out in the roof moisture condensa tion box: sun and weather during the daylight hours with positive moisture condensation at night. For complete exposure details refer to notebook 958, experiment 70. DU P050149739 INS* RATISS DUP050149740