Document k9eBw583o4jed0D9bwE13kJRy
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 3. Aroclor 6442/5460 (30%) plus Santicizer 261 (70%) for Aroclor
1248 replacement. 4. Aroclor 5442/6460 (62%) plus Santicizer 261 (48%) for Aroclor
1264 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 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 6442 and 6460 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 5442 or 5460 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
Santicizer261 368
1.00 mm. Hg. 78.3 (25 Cl
8.9
Aroclor1254 326
9.00 mm. Hg. 7.5-10.0 (100 C) 12.8
At 25 PHR <A) in
LP-32/SRF at 30 PHR Wl. Loss 17 days at 100 Cl
< 15%
25%
At 40 PHR <B> in
LP-32/CaCOs at 40 PHR Shore A % Wt. Loss (7 days at 70 Cl
12 1.9%
21 2.1%
100% Modulus (psi)
100% Modulus (7 days in H20 at 70 Cl Ipsi)
40 33
41 38
Tensile Strength (psi)
Tensile Strength (7 days in H20 at 70 Cl Ipsil
% Elongation % Elongation (7 days in H2O at 70 Cl (psil
104 102 365 665
99 157 475 835
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FORMULATION Polysulfide ^ SRF Carbon Black Uncoatad CaCOg Plasticizer
Table 2
COMPARISON OF SANTICIZER 261
VERSUS
AROCLOR 1254
PHR
A WEIGHT
PHR
100 100
30 100 25
40 40
B WEIGHT 100
CATALYST SYSTEM Lead Dioxide Stearic Acid Plasticizer
50 5
45
15
50 5 15
45
Sulfur
- - - 0.1
,1* Thiokol's LP-32
Santicizer 148
Santicizer 148 should give lower volatility in polysulfides than Aroclor 1254. It is lower in viscosity.
Santicizer 148 Santicizer 261
Vapor Pressure mm. Hfl. (200 C)
0.54
1.00
Viscosity Centistokes
(26 C)
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 5442/5460 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 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 50 C (122 F) should be adequate.
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Polysulfide ^ Filler Plasticizer Lead Dioxide Santicizer 160 Stearic Acid
100 ) )
30 } )
25 )
50 )
>
45 }
)
5)
Table 3 100
15
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
ID Thiokol's LP-32 12) Activated carbon method
Volatility % Plasticizer Lost (1 Day/
87Q C)(2)
7.5
4.7
4.5
4.0
4.5
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Table 4
Santicizer 261
Santicizer 160
( Aroclor 1248 i[ ( Aroclor 1254
Viscosity (Centipoises) #6 HAT Brookfield at 23 C
% Aroclor 5460 By Weight
33-1/3
50
67-2/3
~ 670 ^ 9,700
458,000
~ 440 ~ 4,000
300-400 cps ) i
: 12,000 cps )
- 375,000
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"Nothing eonlllned tir|n li to be construed *i i reccmmendetlon to UM iny product In conflict with my potent. MONSANTO MAKES NO WARRANTIES AS TO THE FITNESS OR MERCHANTABILITY OF ANY PRODUCTS REFERRED TO, nctMttMeeol ortdietwy lewlUtiem lellmte.upcn wntelned tntormeHon errecommenOellont.end dltcltlmi oil Hoblllty tor ony resulting loss 01 dsmige."
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P.3rNl<*.OA7n.6 I ITHO IN II A A
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