Document 2jzz8Rv3eDM3BLeXVM17VVnNp

> ' C- / ffilil 111 KILL U "INDEXED"F,e 2*53 Indexed cs - J. Wo Iliff* Lab* Bussell Morgan* Lab* Po B. Evans* Lab* So 0* Homing* Lab* Do L, Herndon* Lab H W* Laurrell* Lab* Wo F. Singleton* Lab F* Martinss!* Lab Bo M,, Kirkpatrick* Lab* Oo Ho Bullitt* Jr** Ezp0 Sta^uilm, Patent Section. lab. Library* Lab *5) File5 1810 Marshall Laboratory January 29* 1953 MEMORAMDOM REP0B.T WO. M-543 prepared by? M, P Morse fr <V " twi nt OA'-ki;*- SBTTL3M OF "FLOW-RCTE" iroODWQglOH A low gloss "Fl@wKoten formulation was recently placed in plant production and some of the batches were found to give hard settling on the Travelpmefcer when adjusted to 60 ffi Stormer viscosity It was requested that the product be investigated to determine the reason for the observed settling behavior* smmm 1* Microscopic emarainsbionashew no differences in degree of dispersion or particle else distribution between batches having good and poor settling characteristics * 2* At very low rates of shear, the viscosity of batches showing bad settling Is much lower than is the viscosity of batches showing little or no settling* This means that the batches showing bad settling had insufficient flocculation present to prevent settling* 3* The Brookfield viscosimeter Is quite satisfactory for low rate of shear measurements of "Plow-Eote*" Viscosity measurements at 0.4 RHI correlate well with Tr&yelometer results* STATES The maintenance paint group has found that shelf storage samples at normal room temperatures do not decrease to 60 JCU nor do they show hard settling* There is* therefore, no need t improve settling at 66 KE and perhaps no need to improve settling at package viscosity (TO KU)0 N35464 rS** Ifemarandum Report No* m-543 January 29* 3.953 Shelf storage at; elevated teapturas does reduce the Stonier viscosity of ^iaf-Kote5' hut it is. not toot if a reduction to 60 BN through daelf aging will produce the hard settling obtained by dilution of the original sample to 60 HI* Study of this has been requested* ACTION Brookfield viscosity measurements will be used to investlgate the settling characteristics of plant and laboratory batches of ^Flow-Eote1* at package viscosities when subjected to the Travelometer-and shelf storage at normal and elevated temperatures* BIPBRBENTAB DETAILS Samples of batches giving good and poos? settling characteristics on the Traveloaeter were obtained and examined* Nrawdowns were made on glass (.1 jail dry film thickness) and examined with the binocular microscope* No significant dif ferences in site distribution or degree of dispersion were observed,, There was no evidence of seed or grit which might cause bad settling* Seven-day fravelcwter ratings were obtained on thirteen Philadelphia plant batches, and one Fort Madison plant batch, all adjusted to 60 raj Sterstar viscosity* A laboratory batch containing a new china clay extend' and a Sherwin-Williams batch were also tested in the same manner' The viscosity at 0*4 bpm ms determined with the Brook field iriseosimeter for each of the above batches adjusted to 6.0 X<N,, Since the maintenance paint group has found the Travelmeter ratings n the same batch of wFXitete" to vary by 4- 1 rating unite due to experimental error, we have compared Naples of 8 to 10 rating (little or no settling) against those having a rating of 5 or less (bad settling)* The attached table shows that the viscosities at 0*4 BFM correlate very well with the Travelometer ratings* Those samples having ratings of 6 and 7 are not listed* The low viscosities -of the samples showing bad settling indicate that these samples were net sufficiently flocculated to prevent settling* MB3BSLN 1ABQHAT0BY MMaig 1/23/53 Attach* M. F* MQB&B DUP030003467 i 9f m s 8 PSS 8# RS 8 r oa~S Is co t< ' Q\ jc? tn w .in in in ma I 1 sg I 99 P?S a & & <aIri s I n 1H iH n^i sfwiS is@w *^.1.8.. I|j q Hcn A$> l|f'l|||S8S8l Ifm <=* HftHf if Oo 1.rt ! 1*5s 3 1 <&a %i & 60 S 3c ,c|An 0? at I \H DUP030003468