Document XzRNnpJZ5Dn7bN4p2v7L7jm7R

E. I. DU PONT DE NEMOURS & COMPANY PIGMENTS DEPARTMENT 256 VANDERPOOL STREET NEWARK, NEW JERSEY Copy No. 1 NEWARK PLANT PIGMENT COLOR RESEARCH REPORT CHROME GREENS PREPARATION BY DRY-BUENBING PROCEDURE Period Covered 1 February, 194-6 - July, 1946* FILE, DATE, 3/25/47 N39992 Copy to #1 - Numerical me 2 - Research Offlee (214) 3 - Library File (214) * - #10 Building File 5 - V. Chalupeki* Plant Files* 6 - Imperial Chemical Industries* ltd* ,, m m * 8,, e * * m > 1 F. Spengesan* Newark serial He* Oepy He. KN-46-52 l NEWARK PUNT PIGMENT COLOR RESEARCH REPORT Progress Report Title* CfflWHE GREEKS PREPARATION 8 KRY-3LENDINC PROCEDURE. Period Covered* February* 1946 - July* 1946. RATE SUBUmaO* 7/19/46 N39992.01 DUP050150415 a- masimsM An eoonasda analysis indicated that the manufacture and sale of chrome greens would be more profitable if dry blending of the blue and yellow component* were substituted for the orthodox slurryblending procedure.* Dry blending would have at least two money-saving advantages! (l) elimination of double filtration of the blue component, and (2) reduction in amount of storage spaoe for substandard green stock. Presumably the percentage of OK material would rise sharply since all dry blending could be based on results of laboratory board mixes* This is not a new problem. During the period 1929 * 1932 work wae carried out in an attempt to dry blond B-66-D and greening yellow, but was unsuccessful because of streakiness end non-uniformity of product. At that time it was felt that the hardness of iron blue was responsible for the unsatisfactory results. Early la 1946, micro atomisation of grams was attempted for another purpose, but the high dusting sad bulking eharaeteristioe of the produet offset any advantage gained in uniformity and bright dry appearance (KN-46-49). Further more this procedure involved equipment net available oa ths Newark plant. In view of the foregoiaf facto the present researeh program was set up primarily to test the use of B-216-D and the sealed vat, soft-textured B-2162-D, plus Y-493-B, In existing equipment. The Muenoh mixer (a conical rotating mixer with rubbing dices spaced at variable distances) was selected for the purpose because of its combined blending and grinding notion. Two Huenoh mixers are available at Newark! a 2 barrel (500f) mixer in the Bend-Works and a 5 bafcrel (1250#) mixer in the plant. To date, no 100j( effective moane has been found for eliminating steakinese (separation of blue and yellow) when the green is rubbed under a spatula. The Sales Department, however, has sheen interest in G-647-D made in the Muenoh mixer from B-2I62-D and Y-493H9 and then sdkre pulverised. Work has been confilmail to one light and one dart shade of both the 9-550-D and 0-604-D lines. In general, the dry blended dark shade groans are more homogeneous than the corresponding light shade greens, end those made with soft textured blue are superior in uniformity to these made with B-216-D. B seems safe to conclude that neither the Muenoh mixer alone, or anv other blendes by itself, will provide satisfactory answer to the problem. A considerable shearing action is apparently necessary in conjunction with the blending. In the only ball-milling carried out to date (a 12" x 6* laboratory model), the dart, blue, intense dry appearance obtained in the resulting green was offset on rubout by extreme lightness end yellowness of maeetene and tint, indicating that the blue eespenegt might have been "overground". None of the Muenoh mixed produets exhibited "tailing* or vehicle separation on a Kent roller mill. There wae, however, considerable separation of blue on the first loose pass for all products which bad not boon repulverised. The darker greens were understandably poorer in this respect than the light greens. Reference is made to the Paint Laboratory Memo Report on "Muenoh Mixed Chrome Greens" dated 6/26/46. DUP050150416 -2- Greene (previously partially Muenoh mixed) ground on a small-scale Sprout Waldron attrition mill (12* interohangeablo dim) vara no batter in quality than those which had been mlkre pulverised* Greene (previously partially liueneh mixed) ground in a laboratory eale Micron!ter fcjtatl Pulverising Corp) were attreotive in dry appearance and uniformity and shoved a sharp decline in streaking* Bulking and dusting vere apparently increased, however, and an additional disadvantage from an economic standpoint lies in the fitet that this equipment is not available* Furthermore the Microalter commands payment of royalties* The use in a Hueneh mixer of Mentor 28, a petroleum hydro carbon, in an amount equivalent to % of the total charge had the effect of producing an attractive, pellet-like, lev dusting and bulking green with, however, no improvement in uniformity even when repulverised*. A 50*59 mixture of Mentor and Petronate had the earns effect to a looser extent* Both products on rub-out wore light, yellow and weak versus standard* A three stage process of thieneh mixing repulverization re-Muench mixing was found to be equally unsuccessful* Muenoh mixed greens made from super-soft textured blues are considerably softer in texture than those made with B-216-D. This effect is especially notice able in the darker shade* mum The preferred procedure appears to be free of patent infringement. Ho patentable developments appear to have resulted from the program to date* jnmBEJBMBt It is suggested that future work be devoted to improving the darker shade of green in which 8ales has shown interest, plus evaluation of the suggestion to blend Blurry struck G-550-Q with B-216-D (or B-2162-D) to produce the darker shade, and the converse, slurry struck G-647-D with Y-493-D to produce the lighter chads* The method of Hueneh mixing need in each eaae was to charge the mixer with yellow and blue;, the quantity of each depending on the shade desired, setting the discs as eleee as praotieable (roughly 1/X&* apart), and blending for 60 to 90 minutes* One disc rotated elowly with the blender iteelf (21 RPM), the ether at 1250 RPU in the opposite direction* Xnfew eases was any appreciable increase in blueness of dry appearance noted after 45-60 minutes* One exeption was la the one plant mix made* In this case, improvement up to 90 minutes was noted, hut the preduet failed te reach the depth of standard in dry sppaaranee* It is interesting to compare bulking, dusting and texture of tha Muenoh mixed pro&uete with standard slurry struck greens* Tm..... Components Haw Hade Bulk, lh/wal. ...JEsafoaes, gHfltlBKjL Ui~. 2L~ M*--. S-647-D Std. B-2162-D+Y-493-9 B-216-DVY-493-D Slurry Struck Hueneh Mix Hosnoh Mix 4.1 5*8 6.0 6*5 3*8 2.2 13- 13 14 16* 16+ 1713- 13- 14 \ DUP050150417 (Coat'd.) .Xmml .... 0*550-0) II n 3' Components Std. B-2162-D+Y*453-D B2l6*DeY*493*D Hon Bade Slurry Stuck Musneh Mix Uuenoh Mix Bulk* lb/gal. 6.7 6.5 6.1 IfSEttCl. if Imt 2k. 4k- 6.9 13 13* 16 3.2 13* 16- 17 4.2 13 16 16+ There ie a slight loss of texture* Incidentally* upon repulverization. Ttro email seals hall mill runs, both unorthodox in nature because of misting equipment, sore madei on* on fl-647-0 and one on G*55*D. Beth runs used B~2l62-D and Y-493-0. Four lbs* of pigment sere milled with 25 lbs. of 1/2* Stool balls and 2 lbs* of roofing nails to prevent balling-up. Despite an attractive dry appearance (dk and blue vs std.) the produete in rubout were* M Tin 0-647-0 type ve G-647-D It. and yell OK s yell 0*550*0 type vs 0-550*0 It. and yell OX v yell -- mtSBA Details are reported in OSH 46*24. Bulking evaluations**TM "*** * the Scott Bulkometer. Ousting mas measured by the modified Roller Particle Sise method. Photo micrographs and spectrophotosostric curves of several of the samples are included in the Development Section Notebook. DUP050150418