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Monsanto
TECHNICAL SERVICE BULLETIN
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IMPROVED PLASTICIZERS FOR POLYSULFIDES
We would like to present candidates for polysulfide sealants. We have used as a control the chlorinated biphenyls.
A. AUTOMOTIVE
The two most commonly used chlorinated biphenyls are Arocloi 1248 and 1254. We suggest the following candidates for evaluation:
1. Santicizer 679
2. Santicizei 213
3. Aroclor 6442/5460 (30%) plus Santicizer 261 (70%) for Aroclor 1248 replacement.
4. Aroclor 6442/5460 (52%) plus Santicizer 261 (48%) for Aroclor 1254 replacement.
These products should have minimal softening or marring effect on acrylic enamels. The use of chlorinated terphenyls (Aroclor 5442/ 5460) will stabilize the physical properties of the sealant over a temperature range up to 70 C, thicken the plasticizer to give non-sag properties and provide the excellent adhesion characteristics Of Aroclor plasticizers.
On a per pound basis, Santicizer 679 is cheaper than Aroclor 1248 or 1254. Santicizer 213 is cheaper than Aroclor 124$ or 1254 on a pound-volume basis. Santicizer 261/solid Aroclor blends compare favorably with Aroclor 1248 or 1254 on a pound-volume basis.
Aroclor 5442 and 5460 can be very readily dissolved in Santicizer
261.
.
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B. LIGHT CONSTRUCTION
The most commonly used Aroclor plasticizers in building sealants are: Aroclor 1248,1254,1260 and 1262. Monsanto suggestions for replacements are:
1. Santicizer 261
2. Santicizer 148
3. Aroclor 6442 or 6460 blends with Santicizer 160 or 261.
Santicizer 261
An evaluation of Santicizer 261 versus Aroclor 1254 in polysulfide is shown in Tables 1 and 2.
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Table 1
SANTICIZE R 261 VERSUS
AROCLOR1254
Molecular Weight Vap. Press. (200 Cl Viscosity Icentistokes) Weight/Gallon (LB 26 C)
Santiclser261 306
1.00 mm. Hg. 78.3 (26 C) 6.9
Aroelor 1264 326
9.00 mm. Hg. 7.6-10.0(100 Cl 12.8
At 25 PHR<Ain LP-32/SRFat 30 PHR Wi. loss (7 davt at 100 Cl
< 15%
~ 25%
At 40 PHR W in LP-32/CaCOrt at 40PHR fchore A % Wt. Loss (7 days at 70 Cl
12 1.9%
100% Modulus (psi)
100% Modulus (7 days In HjO at 70 Cl (psi)
40 33
Tensile Strength (psi)
Tensile Strength (7 days in HjO at 706 Cl (psi)
104 102
% Elongation
% Elongation (7 days In HjO at 70 Cl (psi)
. 365 665
21 2.1%
41 38 69 167 476 835
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COMPARISON OF SANTICIZER 261
VERSUS
FORMULATION Polysulfide*1*
AROCLOR 1254
PHR
aweight
too
PHR 100
SRF Carbon Black Uncoated CsCOg Plasticizer
30 25
100
40 40
B WEIGHT 100
CATALYST SYSTEM Lead Dioxide Stearic Acid ____Plasticizer
50 5
45
15
50 5 15
45 - -
Sulfur
- - - 01
1,1 Thiokol'i LP-32
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Santicizer 148
Santicizer 148 should give lower volatility in polysulfides than Aroclor 1254. Itjs lower in viscosity.
Santicizer 148 Santicizer 261
Vapor Pressure mm. Hg. (200 Ci
Viscosity Centistokes
(2)dCI
22.0
78.3
Santicizer 148 (iso decyl diphenyl phosphate) has excellent resis tance to U. V. and outdoor weathering. This factor could lead to improved performance in sealants requiring good adhesion to glass. Evaluations so far indicate that Santicizer 348 performs favorably in comparison to Santicizer 278 in insulated glass sealants. Santicizer 148 is appreciably cheaper than Santicizer 278.
Aroclor 6442/5460 Blends in Santicizer 160/261
Aroclor 6460 in blends with Santicizer 160 and 261 has been screened in a polysulfide formulation. Results are shown in Table 3.
By using Aroclor 5442 or 5460 blends with Santicizer 160 or 261, a formulator can have much greater versatility in obtaining an equivalent to or a compromise between Aroclor 1248, 1254, 1260, 1262. Ways to do this are shown in Table 4.
The solid Aroclor can be easily dissolved in Santicizer 160 or 261 by heating the blend. In the case of Aroclor 5442, a temperature of 60 C (122 F) should be adequate.
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Polysutflde Filler Plasticizer Lead Dioxide Senticizer 160 Stearic Acid
100 } i
30 } t
25 )
SO )
45 ) ii
6)
Table 3 100
IS
Plasticizer Aroclor 1254 Aroclor 1260 Aroclor 5460/Santicizer 160 (2/1) Aroclor 5460/Santicizer 261 (2/1) Aroclor 5460/Santicizer 261 (1/1)
Initial Hardness (24 Hour Cure)
Shore A
28 30
30
29-30
26-27
Thlokol'i LP-32 12) Activated carbon method
Volatility % Plasticizer Lost (1 Day/ 87" C) (21
7.6
4.7
4.5
4.0
4.6
<4
o22t%<)8
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Table 4
Santleizer 261
Santiclzer 160
( Aroelor 1248 1t ( Aroelor 1254
Viscosity (Centipoises)
#6 HAT Brookfield at 23 C
X Aroelor 5460 By Wright
33-1/3
60
67-2/3
- 670 ~ 0,700 ~ 458,000
~ 440 ~ 4,000 ~ 375.000
300-400 cps ) i
: 12.000 cp$ )
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