Document r6dooJQnyjkND1472E8Ga33yq
mm 18 MARSHALL LABORATORY LIBRARY "INDEXED"
C""2-
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REPORT
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f a b r ic .aUD nr;iHES d e p a r t me n t
CHEKIClw DIVISION REFERENCE COPY rARLIH LABORAfOHi' NOT FOR ORCUUnON
.SUBJECTS
BTRIPPABXJE PROTECTIVE SPRAY COATINGS
M*tt v nmesw somt nnwmn
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PERIOD:
JANUARY 1, 1946 TO DECEMBER 31, 194-6
^3300*8? -1091 and 2131
PREPARED BIS- C.Q- Murphy APPROVE!? BT v RasB^ll Morgan
N 29377
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OPUTEMTS I - INTRODUCTION II - RESULTS ARC CONCLUSIONS III ^ EXIWMSMT^ IT - CHARTS
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; This report covers the experimental wv.k don under the subject research contract for the period January
119*,, through Decenber 31; 1944; It supplements farlin Laboratory Report* Numbers 900, $Q- and <&4 which covered the, experiment*! work done on this problem from January 1* 1944, through December 31,11945
Reports number 900 and 906 covered the development phase of this proj sot while report number 914- oovered mainly surveillanoe tests of exposure aeries on the various formu lations developed under the subject contract and of the NQL8gu 193 Lacquer. This report covers a continuation of the eur velllance tests of exposure tests recorded In report number 91*r*
T.'l REiULfS
CONOLDBIOhS
...
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The conclusion* drawn from the exposure series examined in the period covered by this report la general confirm and substantiate those reoorded in report number 9lhu
However, at the request of ths Naval Ordnance Laboratory, Silver Spring, Maryland, an additional exposure aeries was put out to evslaate,,frotek--float*, an asphaltio type . material' manufactured by Davieon Ohemloal Comply* a topcoat for 92043, \X*t.) stripping lacquer in the method' of' packaging,:
the results of axaminlng thia expoeure aerlee after
sik months1 exposure In Acrid* indlcats that the use of v "Protek-Goat* as a Anal topcoat over 520*3. Lacquer definitely improves thedurabllity of the lacquerfilm, but that an equal or possibly better Maas of inwrcvlng the durability ...
or the: film can be accomplished by the uso . of *, Anal top- ' oeat of 52041 Lacquer pigmented with Aumlnum povdor. This lattsr method also has the advantage of reflecting rather than absorbing light and heat rays eo that the temperature changain the interior of a penkage would vary leaa in a 2'hour period than vfaen ProtetJGoat* le used*
' m BCPtaikgMTAL -
She oonolueicns reached in the previous section of this report concerning the outdoor durability of stepping lacquers art based on the refulte of examining a large number . of exposure series, the more Important ofvhlch are as followes -
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Thta series vu pat out to determine means oflmpwlag tli# Au3?abil,it|r of the HOL0&-193 stripping lacquer vhsn used la the Of-10n5 method of packaging. Carbon black pigmented and aluminized vinyl (including the NOLS0-193 Xormulatlon), neoprene and ethyl cellulose types stripping laoqusre mere applied over the HOLS0-193 bridge on. 15 x 15 lnoh wooden frames and also over airplane doth on frames. Carbon black pigmented and aluminized "Duno* and a carbon blael pigmented vinyl topcoat were aleo applied over the clear 1QL8S-193 lacquer. The films were sprayed to a thick ness Of *10 + 5 mils and exposed in Florida facing south, at 43, ;
At ths end of eighteen months' exposure the following bbeerratlone were rnadei
(1) In general the pigmented vinyl type atrlpping lacquers have better Initial film properties and shorn less deterioration than the neoprene or ethyl oelluloee type. The Ins exception to thie is a oarbon black pigmented vinyl plasticized with trloresyl phosphate and modified with red load which has become quite boardy and Is definitely defiolant In impact realstance.
(2) Pigmentlng-the dear vinyl with either carbon blaok or aluminum, I** topcoating elth a blank vinyl topooat
definitely improves the durability. The use of a 5- mil thick black vinyl topooat appears to be Just as effective m completely pigmshting the film. The dear ROUS-193 film at this stage has practically completely disintegrated vith Only small portions of ths film having enough cohesive strength
t o remain w tbe ifrns.
(3) While blaok or aluminized "Duco* topcoats over the dear NGL00-193 lacquer arepot practical because of poor intercoat adhesion, the Clear films underneath shorn practically ho signal of deterioration, emphasising the effeot of pigmentation lnproteotlng a clear vinyl film from the aotlhie
reye of the eun.
Ooaparatlve data on the progressive weathering of
the above flime 1S contained in Chart go. I at the end of
thie report..
,, .. .
This sedee vae pot out to determine |1) the optimum thiokneae ef oarboa blaok pigmented XOLlh-193 needed to proteet aolear OU-193 fila on eatdoor expeswre, f> the effect
of moleoular weight and vinyl chloride content on the durability of a stripping liefer of the 0OL8S-193 type, (3) the effeot
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of using different type* of oarbon black in pigmanting
NOLSS-193 and (t ) the effeot of disporting the carbon oiftck in a steel ball nil! versus v:i P. mixer. lhe lacquers Were applied at bath ..a 4o. nil'and a 20 sill tbiaicnos Dver clean bare-steel.'and were adhered to the edges of the panel with*l,liobond* adhesive.
At the and of one year's exposure in Florida, fading south at' 45*, the following observations were made?
(1) A two ail thiok oarbon black pigmented modi fication of the dear when applied over the clear definitely
improves the durability and at this stage in the exposure is as sffsetivs as thicker films or totsllypigasnted flints.
(2) The slssrs sll have darkened considerably, show bad eurfaee shacking, decreased toughness and bad corrosive sffeot at thesubstrate with the lower aolsoular xraightAmF vinyl ahloridt content resin formulations being slightly poorer (the difference in decreestd toughness is not as noticeable in ths pigmented formulations);
(3) fhsrs-appsare to b# no appreciable differenot in ths grads* of oarbon blaok tested, bat oarbon blaekdisparsed is a.;Vo. A y. tends torsturn slightly batter durability than when disperssd by steel ball aiU grinding.
Oonparstirs data on the progressirsweatherlng of the fllns with varying thicknesses of pigmented topcoat is contained. In Chart, go. XX at' the end of this report.
, ; g -:
,
fhls serles wasputout to deterainethe relative,
dorability of 13005* Clear Stripping Laoquor meeting epebi-v fioation 580*1, under the following topcoat** (1) 0r~goG-z;-*7l31, a oarbon blaek pigment edeodlflestion of 13005* 12) alnainized aodifloations of 13605 sod (3) "Protok^Coat*, an asphaltle type material male by Dariaon Ohealoal. . .
At theen&efslx months* sxposure in Florlda, faolpg ^ soath' at - 45*# the foilowing obs ervatlonswere made t : '
\ ti) -:ill af4h#;topeoAthC'fi:ur,aadsr /test shew. '
' lit tie or no deterioration, while the clear has darkened
. oonaidershlyand^^
It fcae aisedeoreaeed 0on- '
aidsrnbXy in toughJieea aAmoasutfod'by lose in 'tensile Atreagtfc
end sioitloii*.;',\;
-
(2) While ^ose filae haviM ^roteh-Ceat1 ao a *r-> met ver **>t el ~ a?. show little -:h.tr, . in. taugS**s ?,- tbe
. ^Frotek-Coatfi ;:hae balked considers?,tylost its onrfeoe tack,.
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aad I* tending toward embrittlement. Those films haring aluminised or oarbon blaok topooat show little surface change v'1* no appreciable tendency toward embrittlement.
(3) Tb* moisture vapor transmission rate of the
films topooated with an aluminised or oarbon blaok topooat
has remained praotioally oonstant except In the ease of the
clear film with the 20 mils thick aluminised topooat which
has increased slightly. However, those films topcoated with
*Protsk-.CoatB are shewing an inoreaee in KTTR above that of
the aluminised film referred to in' the previous eentenoe,
This oould possibly be due to the "ProtSk-Coat" becoming
brittle.
/
The sample of `Protek Oont" evaluated was received
from the Naval Ordnance Laboratory, Silver Spring, Maryland.
An analysis of the sample indicates that It Is an asphaltlo
paint packaged at
total solids. Zt is non-pigment ed,
but oontalns a small amount of fibrous asbestos. Zt contains
y.o drying oils or resins. It hr* a paste consistency and at
room temperature is barely mobile.
Zt cannot be sprayed with conventional lacquer type
lug equipment, bat it oan be sprayed without reduotion . at room temperature under the following conditions to give a
fairly smooth film with a build of 5-10 mils par spray coat. Ah "Eclipse Oat* spray gun equipped with a #17 internally atojflsing head and an 1/d inoh tip oanbe used. A fluid pressure (ft 4$ pel and an air pressure at the gun of 6o pel are required.
Zt air dries quite readily to a tacky, somewhat
glossy film> have good adhesion to 52041 stripping lacquer at room temperature. The film has little or no ooheslTs strength- Zts remletanoe to sold eraek, however, is fairly poor; becoming stiff and brittle at *F.. and cracking off the undercoat in large piece# then bent through id* at this temperature. A topemb of highly aluminized 52041 lacquer iZQ% aluminum paste on the lacquer) will also crack under theee conditions but retains its adhesion to the dear undercoat.
While a topooat of *Protek-0oat* dost lower the K7TE
of the film somewhat it is no better In this respect than & topeoa of highly aluminized 52Q'4l laoquer at equal film thicktASSe. It aleoreduces the total strength ofthe film somewhat .more than a highly aluminized 52041 topcoat as indicated belows
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