Document mp0Ly6pjE07dBaqjmyGkpNwQZ
BATE8 ifaroh 2^ 1937
REPORT NO. 776
DUPONT
mar s h al l l abo r at o r y l ibr ar y
tVT?Kr. COPY
PARUi LABORATORY REPORT
800(0*8 CAM STABILITY OF 3*1-2 LIME' AMELS
PERIODS DECEMBER .1935 - FSBRUARX 1937
REPORTED Ml jeyy ix,. iazssm--:
APPROVED Bt%
N 29338
PARLXH LABOHATOHI REPORT HO^ JJ6
i"'0AH-OF'-Ste':I-XSSS EKAMHSa; ' ';`: ' - ','-vv'.'v''-
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When the 242 Line was developed and factory proauction started! a one gallon sample was taken from each batch of matexdal mannfaotured at Parlin and stored In pint earns to determine the can stability of the enamels* Samples were also made up in the laboratory of the white enamels in the 242 Line The finished black enamels in the 242 line were not included in these testSo
Previous work has shown that aino oxide in the presence of EL-233 resin produces a gilt formation in the enamelo The purpose of these (fan storage tests were to determine how long the 242 Line could be stored without appreciable grit formationc The viscosity of the enamels was determined at
fvarious intervals over the storage period: to show any effect of
aging :on viscosity,,
It should also be mentioned that the 242 Line white enamels*, 242-009 and 242-0094 were originally formulated with a PX/Resin/plaatioiaer ratio of lO/9/lo This ratio was changed to 10/7/3 when factory production actually started,, Practically All of the enamels included in these tests were manufactured on the 10/7/3 ratio, Shortly after production of the 242 Line had been started the ratio of PX/Resim/plasticiser was changed to 10/9/31 to improve the flexibility of the enamels0 The colors other than whites have been on the original Px/Resm/ Plasticiser ratio of 10/5/5go
All of the work included in this report was done using RL-233 with an acid number of approximately 5 and the resin manufactured by the fusion method,, At the present time the EL-233 is manufactured by the fusion method with an add number of approximately lo
The purpose of this program is to determine the extent to which the 242 Line can be stored in cane with the Idea la mind of releasing the material to the Eeflnish and Export trade if can stability permits0
lo The 242 Line enamels containing sine oxide may be stored at room temperature (average 75F) for a period of 12 months with but very few instances of grit formation? these instances are not to the extent of making the material unfit for use Small quantities of grit were noticed in several samples after storage of 9 monthso These same samples were satisfactory for use after storage of 12 months-,
80 ISaamels in the 242 Line that did not contain
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zlno oxide did not show any grit formation after 12 months' storage at room temperature
3 gone of the enamels is the 242 Line exhibited any great Inorease or deoreaee in viscosity on storage,. The white and green enamels showed practically a constant viscosity throughoutand maroon enamels increased in viscosity'duxdi%'^the^'yes^r's^ storage', this increase* however* was not to the extent of affecting the working properties of the enamels or to the extent of making a change in the thinner ratio necessary in general all of the other tinting enamels and finished colors decreased slightly in viscosity over the period of one year Apparently as far as . viscosity is concerned, the 242 Line is satisfactory for use after storage of 12 months at room temperature,,
As a result of these can storage tests? the 242 Line may he considered satisfactory after storage perlode of at least 12 months in climates similar to that in this part of the country As shown by accelerated can storage tests* at elevated temperatures^ the can stability of the 242 Line Contain ing zinc oxide would be fedu^
At the present time the RL-233 used in the 242 Line has an acid number of 1 as compared to an acid number of 5 of the RL-233 used at the time this series of tests were made Accelerated Can storage tests have indicated that this reduction in acid number sill greatly increase the can stability of the 24-2 line enamels containing zlno oxide,
The viscosity data given can only be considered to show trends since there have been a number of solvent and other changes since the storage tests were started
One gallon samples were taken from each factory batch of 242 Line tinting and finished enamels from the time the 242 line was starts! in production until approximately the middle of February 1936 The samples were then taken over a period of several months Each of the one gallon samples were Canned into eight pint cans and placed at room temperature for storage The original viscosity and the viscosity at various intervals during the year was determined and recorded At the same time each sample of enamel was thinned and a pour made on a glass plate to show any grit that may haveformedo
During the period over which the samples were collected the composition of the white tinting enamel changed from a PX/Resln/plastlolzer ratio of 10/9/1 to 10/7/3 This ohange was mads to improve the flexibility of the enamels, The other color in the 242 Line had a ratio of IO/5/5J The
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formulas for the white tinting enamels and a formula repre senting the other colors are given heiowv
E&AMEL (10/9/1 Ratio)
*am_
Resin H-lll
W-X33 Tho Analo
*9 i
0 ,0
73
Mb * H-Xg R-78X E-6g
IfP-
8-111
RO-233
(10/7/3 Ratio) x uni
JV^PL 3:
1,, Add 2p60 and
7 70 mix
iRO-7675^ H-111 E22
-- -m m -- lo59 last
W-133 TheOo Anal
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&1
7*. Q
?:35
242-070 LXGHT^OKSEN TINTXHO ENAMEL (XO/S/Sl Ratio)
80^233 *
B-lll H-22
So00 8111 Base ">31 J?M 5I ZI
Solids
Resin 1-111 1-22 W-781
fheo.
All of the viscosities were determined at 2g0 o although at the present time the standard praotioe is to male the determination at 25Go
the attached tables give the viscosities of a number of representative tinting and finished colors In the 242 Line* The general trend of viscosities of the various tinting enamels and finished colors is shown in the attached curve S o
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