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Boose Paint "47" Process Pfaumer Bros. Wetting Agent
Still TE HHISHIIL UBBMTOHT LISBA8V
R. Morgan,
K"
R. B, Davis, " *
P. B. Evans,
Stuart Graves, *
"
W. F, Singleton, Marshall Lab.
j. B. Oyler,
Marshall Laboratory November 23, 1950
MEMORANDUM REPORT NO* M-322 ipmt w h u iu w m* mmunwniKwintfiiiiii iimw iiiUiih w i ........................................................ ia
CHI1?GLOSS OF .HOUSE PAM (COVERING WQigt REFERENCE' FROM 9/1/50 TO H/l/50) HOT Fit O:' M
Purpose:
To improve the gloss of 301-885 with only minor changes in
the formula*
Conclusions:
'^"~Waumer Bros, wetting agent (SP-1505), at a concentration of 0.555 in 3 01-835 gives a visible increase in gloss when ammonium
stearate (347-X8323) is omitted. There are indications also of an improvement la brushing properties,
A visible improvement also results when the present formula is ground on a laboratory "47tt process.
The values for the increase in gloss above the 301-885 control are given in Table I.
EFFECT OF MINOR ID DIFX CATIONS OF 301-885 ________ON GLOSS AND BRIBHABILITY
Formulation
lagnltude of the Increase in Gloss .. _1P* O.o5i;......
Spreading{ Lapping
j
1. 301-885
Control
2. Omitting ammonium stearate and
adding O.55S wetting agent
12.8 7.0
ja'"Omitting arnmoElum stearit 'and
adding 0*5fa wetting agent and
M-25 0K0 bodied oil.
15.6 7.1
4T"USm aJig' diMon'iiAM.ateafate..and ~
soya lecithin and adding wetting
agent and bodied oil
17.7 2.9
Omitting ammonium stearate and
soya lecithin and adding wetting
agent.
17.5 8,6
6, uniting ammonium stearate and
soya lecithin
12.3 4.1
fOmit'txni..'soya lecithin 3. Omitting ammonium stearate
" 9.3 5.3 373* 1.1
. M4>
Very Good Very Good Excellent Excellent
Good ......1 '
'
Good
Good Pair
Fair
Fair
Poor
Fair
Good
5cry Goon
M
m*
N35420
The effect; of grinding twice with the laboratory 47" process
Instead of the 3 roll mill, varies with the formula of the paint. The extra grinding is less effective when the wetting agent is present.
Formulation
mMM
Value of Increase in Gloss due to w47r* Process instead of 3
(a) 301-685
(b) 301-885 without ajamonium stearate
in) 301-885 without ammonium stearate but with 0.5$ wetting agent
{q .) 301-685 without ammoaium stearate and soya lecithin but with wetting agent and OKO fit-25 Oil
15*4 + 10.4 10.71 *0*7
3*7 1 3.7
8.9 1 9.4
Since the wetting agent is apparently accomplishing the same extra dispersion as the "47" process, it is possible that additional experiments would show that properly chosen wetting agents could re duce grinding costs.
The effect of the laboratory "47* process following a plant 3 roll mill is illustrated by the following gloss increases. One pass through the "47" process gate an increase of 9.1 * 4.8 {P 0.05)? 3 passes gate an increase of 16.9 1 7.4 gloss unitsT
Details:
The data in Table X were obtained by pairing gloss measurements from brushouts on 5 different days, on 3 different substrates {primed red cedar, pearl, and clapboards) and from paints prepared by both 3 roll and *47 B process grinds.
For Table XI, pearl boards were brushed and dried out in the constant temperature room. The gloss was read on the 85 photovolt glossmeter calibrated at 96 gloss units with a black gloss standard,,
Using the constant temperature room, and the same type of alkyd-primed red-cedar panels, good reproducibility can be obtained. Thus, 20 readings m 5 different areas of 4 different panels, brushed out on 4 different days, gave a mean gloss of 60.4 + 1.4 (3? 0.05) The ye is probably not able to detect dlfferenoies*"in gloss of less than about 7 gloss units.
MARSHALL LABORATORY
MJScDs^b
M. F. McDOTffiLL
DUP030003222