Document e7Z1wqQYRzVXgG8BgJ0x6OdLE

Serial Mo. KB-44.-45 Copy No. 1 Copy to: #1 - Numerical File t/ 2 - Research Office 3 - Library File 4 - Mr. L. E. Kelly, Newark 5_ n w n 6 - Imperial Chemical Industries, Ltd. 7_ it nn 8_ n n 11 it 9 - Mr. C. H. Rupprecht, Wilmington (ICI File) 10 - Paint Laboratory 11 - Mr. F* E. Bolton, Newark 12 - Extra NEWARK PLANT PIGMENT COLOR RESEARCH REPORT Final Report Titles Zinc Yellow/nIMPEDEX'" Primer: Formulation of Navy Spec. 52-P-68-: Period Covered: April to June 1944* SUBMITTED BY: G. G: APPROVED BY : DATE SUBMITTED: 6/30/44 DATE ISSUED: 7/13/44 N37962 aHasuaasm* The Specification 52-P-68 comprises a zinc tetroxychromate/ "IMPBCE!"/Asbestine primer using an oxidizing alkyd vehicle (Spec. 52-S-8) of the aircraft primer typej zinc yellow may he substituted for the Z*T,G*C, the zinc yellow modification being pigmented at 35% pigment volume, the Z.T.O.C. primer at 405! P.V, Grinding difficulty encountered in the manufacture of the prime? leal to W/R G-39 requesting a formulating study. The principle complaint was concerned with extreme bodying, which led to livering in the mill, of the Z.T.O.C, modification. "IMPEDE! being a radical innovation in pigment material was suspected by some as the cause. The purpose of the present study was to establish the relative reactivities (bodying effect) of Z.T.O.C,, sine yellow and "IMP1DSX", and to recommend the most satisfactory grinding conditions. A survey of the products of three manufacturers of suitable alkyd vehicle was made. CQlCLDSIQi: Relative..Reactlvitle.s...-of...the.,Prime..Pigments. The primary purpose of this work was to develop data relative to the respective reactivities of Z.T.O.C., zinc yellow and "IMPEDE!" in the 52-P-68 formulation. The data demonstrated the order of reactivity (bodying)s Z.T.O.C., "IMPEDE!", T-539-D. Z.T.O.C. having been considerably more reactive than zinc yellow, and "IMPEDE!" approximately equal to Y-539-D but very slightly on the low side. Therefore it would seem that Z.T.O.C. were the offender rather than "IMPEDE!" in the cases reported to have livered in the mill} no case of livering has been reported for the zinc yellow modification. It has been shown that extreme bodying may occur either in the mill or on storage in the case of single pigment or composite grinds of the Z.T.O.C, modification; however, by grinding the combination ZT0C/"I1PEDE!", the bodying tendency of Z*TiOiC.` is not evident. Although properly formulated, bodying may occur in the Z.T.O.C. primer which in extreme cases may result in livering in the mill or in the can. In the case of the zinc yellow primer such reactivity is not evident} if properly formulated it should yield satisfactory primers. Grinding Procedure. The phase of this study most important to the practical paint man concerns the grinding formula, i.e., single pigment mill bases vs, composite grind. It would appear from the data presented In Table IV and V that for maximum production in a given mill, the zinc yellow should be ground separately and later combined with a preground "IMPIDEX"/Asbestine mill base, with both bases at a pigment volume of 50$. This feature has been outlined in the formula suggestion P-190-G (see copy at end of report). A 16 to 20 hour grind in a plant sized ball mill for the zinc yellow and a 50 to 60 hour grind for the "IMPEDEX"/Asbestine would probably be sufficient, or a 50 to 60 hour composite grind should meet the DU P050149863 specification fineness rating* If for a given nil! efficiency, the iHNMMwtta rat* were 14 gallons per hear far the composite -- - . J* The bodying tendency ef the three pigaents was collared by formulating the primer la three was single pigment mill bases, composite mill bases, (chrome plgnmt/aillPljKia) and composite primer grinds (chrome pigaent/^IMPEDlX/Asbestine), The data are presented in tables I to VI. As the thinner content was not held constant when the pigment volume was altered, comparisons of consistencies of any one pigment at different pigment volumes oaimot be made. How ever, a comparison of pigments at constant pigment volume is valid. Thus Z.T.O.C. shows definitely greater bodying tendency in the mill than sine yellow or #IMPEIx| whereas, sine yellow shows slightly greater bodying than nVFXBSX. The bodying tendency of ZT#0.C7 demonstrated in the single pigment mill base is leveled out in the two pigment bases so that bodying in the mill or in the can is close to the level of sine yellow but still is on the high side. ict of Z.T.O.C. is demonstrated in the g may occur in the mill or in the can m at t*ie a*ne modification lslrni zinc yellow, zinc yellow/IMPSI3BX, sine yellow/^USPESEXVAsbestine, and Asbestine. The rate of texture development during the course of the grind was followed by means of the Sherwin Williams fineness gauge. It was found that zinc yellow was much more easily dispersed than either "ISPSDEX* or Asbestine. BIMPEDEX* was as difficult to disperse to the specified fineness rating as was Asbestine. DUP050149864 4- Msimw Mzm ,i3JL Aft indicated la the conclusion, the most suitable grinding formula both on the basin of highest production and the development of low consistency, is one which involves grinding the sine yellow as one sill base and the A-l-D/Asb&stin as another both at 50$ P.V. ,, primers were prepared from American Cyanamlde Resyl 728-5, General Electric 2V-3504, and Strook-lfittenberg Aroplsa 8-338} all three conformed to the specification 52-S-8, As may be seme from the tabulation Rosy! 728-5' and ||Nl04 produced primers having satisfactory properties. 8-538 showed excessive bodying after about 72 hours grinding} the oven aged material llvered. It would be anticipated that its high reactivity would create grinding difficulties sad storage problems. Refer to Botebook - 1037* Bxpts. 35-39, 56 DUP050149865 tflg-l t a g lft.fflgasB .IU 1 JffMfML ffAHLR TTT Mimantation t.V.of W affcer suuBaM ttMh Cfinished primer) 1037*35 36 35 36 2I0C/A~l-D/*at>., 55/16/27* * / * / * y-539-D/A~l~D/Asb.,51/19/30* / / , 45% 72 109 t 61 w 70 126 101 78 95 *Spec. ratio by weight DUP050149867 llia m s fineness gauge s 1 ve ry poor, 8 p e rfe c t, 6 o r b e tte r s p e c ifie d in 52-P-68 13313 A. /n. A A. Be * -$** 4 *"333 ***33 A A. r \D v\ m -<* lAIAVNfcA lip** if-H'EjNOCMQ pMfe<A r o fi oH t~ m i> ^v n ~3-sf $ (= sO A MW9 I 8 v\c^ nO -4`crunot WNCiOtt so \0 im m w a rn m iA Q % m irm m i 0) ti * DU P050149868