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Monsanto
TECHNICAL SERVICE BULLETIN
f/70.
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 Aroclor 1248 and 1254. We suggest the following candidates for evaluation:
1. Santicizer 679
2. Santicizer 213
8. Aroclor 5442/5460 (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 544?/ 6460) 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 1248 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 8. 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
SANTICIZER 261 VERSUS
AROCLOR1254
Molecular Weight Vap. Press. (200 C) Viscosity (centistokes) Weight/Gallon (LB 25 Cl
Santiclzer261 368
1.00 mm. Hg. 78.3 (26 C)
6.9
Aroclor12M 326
9.00 mm. Hg. 7.B-10.0 (100 Cl 12.8
At 25 PHR (A) in LP-32/SRF at 30 PHR Wt. Loss (7 dayt at 100 Cl
<15%
- 25%
At 40 PHR<B) in LP-32/CaCO^ at 40 PHR Shore A %\Nl. Lost (7 day! at 70 C)
12 1.9%
21 2.1%
100% Modulus (psi)
100% Modulus (7 days In HjO at 70 Cl (psij
40 33
41 38
Tensile Strength (psi)
Tensile Strength (7 days in H20 et 70 C) (psi)
104 102
99 167
% Elongation
% Elongation (7 days In H2O at 70 Cl (psi)
365 665
476 835
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Table 2
COMPARISON OF SANTICIZER 261
VERSUS
FORMULATION Polysulfide ^
AROCLOR 1254
PHR
aweight
100
PHR 100
SRF Carbon Black Uncoated CaCOg Plasticizer
30 25
100
40 40
^WEIGHT 100
CATALYST SYSTEM Lead Oioxide Stearic Acid ___ Plasticizer
50 5
45
Sulfur
-
-............... 15
-
-- 50
5 15 -45 - -
- 0.1
Thiokol'* LP-32
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Santicizer 148
Sanlicizer 148 should give lower volatility in polysulfides than Aroclor 1254. It,is lower in viscosity.
..
Sanlicizer 148 Santicizer 261
Vapor Pressure mm. Hg. (200 C)
0.64
1.00
Viscosity Centtstokes
(2|>o Cl
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 148 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 5460 in blends with Santicizer 160 and 261 has been screened in a polysulfide formulation. Results are shown in Table 3.
By using Aroclor 6442 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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Polysulfide*1* Filler Plasticizer Lead Dioxide Senticlzer 160 Stearic Acid
100 ) I
30 > i
26 )
60 ) i
46 ) il
6)
Table 3 100
16
Plasticizer Aroclor 1264 Aroclor 1260 Aroclor 6460/Santicizer 160 (2/1) Aroclor 5460/Santicizer 261 (2/1) Aroclor 6460/Santicizer 261 (1/1)
Initial Hardness (24 Hour Cure)
Shore A
28 30
30 29-30
26-27
Thiokol's LP-32 (21 Activated carbon method
Volatility % Plasticizer Lost (1 Day/ 87" C) (2)
7.6
4.7
4.6
4.0
4.6
4
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Table 4
Santlcizer 261
Ssnticlzer 160
( Aroclor 1248 i\ ( Aroetor 1264
Viscosity (Centipoises) #6 HAT Brookfield et23C
X Aroetor 0460 By Weight
33-1/3
60
67-2/3
~ 670 ~ 9,700
~ 440 ~ 4,000
300-400 cps ) i1
: ^ 12,000 cps )
~ 458,000 ~ 375.000
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