Document EnEw0NLoV2xejw1qBQGjYNbV

a l l ie d r e s e a r c h KEnari* Dumber EC JS SUBJECT HOUSE PAIDT PRIMER STUDIES OJ 1935 SERIES 0. R. Jcv,gd October 27* 1937 ALLIED RESEARCH TALC ALE CRIES CHICAGO, ILL^0IS HOUSE FAIN? PBIMEB. STUDIES OF 1935 SERIES statement This report on house paint primers is supplementary to "Outline of House Paint Primer Studies," dis* at the Technical and Operating of November, 1935* The general. description of formulations and physical ll^rftcteristics of these primers may he found hy referring to the above bulletin, copies may be obtained on request. ' The purpose of the 1935 exposure series was to cover the basic itatures of house paint primer formulations in a systematic manner. A study was of tire fundamental features of house paint primer formulations as suggested 3the current literature and the ieading pigment companies such as the National J/.': Jv;. _ . *dCo.t New jersey Zinc Co., Titanium Pigments Co., Krebs Color & Chemical Co. ici Sherwin-Williamsi The various primers in the series were formulated so that * ' 'complete study could be made of the vehicle and pigment composition. The vehicle was; studied from the .standpoint of the proper propor- of volatile to non-volatile, ra*? oil t;: oroccssed oils and the effect of r* presence of resins. The pigments were strived from the standpoint of pigment ^ concentration, and composition. The . jaipi pigments used were white lead >, lead titanate, zinc sulfide and tiia'iiun pigments. The white lead con- was held quite high in most of the formulations. The inerts studied were :a> dead burned calcium sulfate, mica, asbestine, Celite #110, aluminum pow- kit'--: ' ,, r* serecite, said flake graphite. Six competitive exterior house paint primers * Purchased on the market along with white lead in oil were also included in these ... -V*' It tests 0007-SWP-000006665 plied on 6 inch clapboard siding both pine. AH paints were applied ou.t-ofend allowed to dry for 43 hours before recoating. One-third of each panel 'painted with a guide paint of SW.P. Outside White (present Titanium Dioxide with three coats being applied and reduced according to label directions: The balance of each panel was primed with an experimental exterior with two additional coats of S'JF Outride Thite on the center section and coat over the end section, producing 3 coat and 2 coat jobs respectively. All k-: a were exposed vertical, south in the latitude of Chicago for a period of two which is regarded as sufficient for preliminary indications of failure. nations On Two Coat System. ' Upon examination of these tests, it becomes quite evident that the .coat system as advocated by several competitive paint manufacturers, particu- Devoe and Reynolds is very much inferior as to durability compared to the ?rd three coat practice. All of the tve cost exposures now show very clearly lock of opacity due to erosion md a considerable number are showing a definite -n type of failure, indicating lack ei p'op/ir protection to the wood. Among the competitive exterior primers there were none in the two 1 work which appeared equal in general appear an.*.e to SWP Outside Tfnite which V.- .. -. applied as three coat work. The degree of rallure on the two coat system is more evident on the Southern yellow Pine ;-han cn. the Northern "Shite pine .1* This difference could not be noted in the three coat system with primer. All formulations carrying lead titanate are showing a definite type of failure end in several cases where a definite percentage of mica 0007-SWP-000006666 -3- ^'"istro&iced in conjunction with the lead titanate, the failure mas very "bad. ^ailnres are apparently due to the extremely soft film that is produced by 0f lead titanate and fishy inerts, such as mica. Among the competitive exterior primers exposed the only two that stiil in good condition are Benjamin Moore's Moorwhite Primer and U. S. Gutta ?** is "Barrelled Sunlight Outside TJndercoater." The Barreled Sunlight Under- l>'jri&tr also produced the "best appearing two coat job as it was rather high in iHk JH?; On all of the 7' experimental two coat systems tested, a definite acting and checking failure has started except those shown below. The film :*5yr ; * integrity of these is still good, but as stated above, the opacity and general . jspsearsnce is inferior to the regular three coat self primed system such as used '^|$6...the "guide." gj'jijprigsers of Satisfactory Performance to Bate - "te'- s Pigment, 90$ White Lead- 10$ Zinc Sulphide: For vehicle see previous report. _ '. Pigment, 90$ White Lead, 10$ Titanium Dioxide: For vehicle see previous bpr$'.report. it ^ r Pigment, 76$ White Lead, 9$ Zinc Sulphide, 15$ Asbestine . ' ' 22 Pigment, 76$ WhiteLead, 9$ Titanium Dioxide, 15$ Asbestine Fignent, 7$ WhiteLead, 9$ Titanium Dioxide, 15$ Mica 2k ^ 4o 49 52 56 Pigment, 3^$ WhiteLead, 37$ Titanox B, 25$ Asbestine MW-401 primer) Pigment, 4o$ WhiteLead, 10$ Mica, 40$ Lead Titanate, 10$ Asbestine Pigment, 100$ White Lead ` Pigment, SS$ White Lead, 12$ Aluminum Fowder Pigment, 30$ White Lead, 79$ Leaded Zinc 35/65, 9$ Titanium Dioxide, 8$ Asbe stine, l4$ Aluminum powder 0007-SWP-000006667 Performance to Date Continued. 30$ White Lead, 39$ Leaded &inc, 9$ Titanium Dioxide, S$ Asbes- . tine, l4$ taich* _ 29$ White Lead, 54$ Leaded Zinc 35/65. 4$ As Destine, 13$ Alum inum Pd. 29$ White Lead, 54$ Leaded Zinc 35/65. 13$ Mica, 4$ Asbestine 12$ White Lead, 33$ Titanium Dioxide, 25$ Silica, 25$ Asbestine 64$ White Lead, 19$ I'itanox B, 7$ Zinc Oxide, 10$ Asbestine 35$ White Lead, 45$ Leaded Zinc 35/65. 1C$ Titanium Dioxide, 10$ Asbestine 35$ White Lead, 45$ Leaded Zinc 35/65. 10$ Titanium Dioxide, 1C$ Asbestine 6S$ Leaded Zinc, 2$ Titanium Dioxide, 30$ Asbestine 35$ White Lead, 45$ Leaded Zinc 35/65. 10$ Titanium Dioxide, 10$ Asbestine irrations of Three Coat System In making a direct comparison of the three coat system where the ial exterior primer and two additional coats of house paint were applied versus ^regular three coat system, we find that several of the exposures show a slight iice cracking. These are principally the lead titanate types where the under & ,;4as remained soft. The guide coat of Bx 471 Sw? Outside White self-primed $>'* . . 4? od condition on all exposures. The two and three coats of white lead in $> ' ^.showed bad checking and bad dirt collection. . 0007-SWP-000006668