Document QgbnY6DBQZ7vvrmEp18e2jO6L

Monsanto TECHNICAL SERVICE BULLETIN 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 3. Aroclor 5442/5460 (30%) plus Santicizer 261 (70%) for Aroclor 1248 replacement. 4. Aroclor 5442/5460 (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 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. 0508769 TOWOLDMONOQ34332 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. 0^08 T> TOWOLDMONOQ34333 Table 1 SANTICIZER 261 VERSUS AROCLOR 1254 Molecular Weight Vap. Press. (200 Cl Viscosity (centistokes) Weight/Gallon (LB 25 C> Santicizer 261 368 1.00 mm. Hg. 78.3 125 C) 8.9 Aroclor1254 326 9.00 mm. Hg. 7.6-10.0 (100 Cl 12.8 At 25 PHR (A) in LP-32/SRF at 30 PHR Wt. Loss 17 days Bt 100 Cl < 15% ~ 25% At 40 PHR in LP-32/CaCO^at 40 PHR Shore A %wt. Loss 17 days at 70 C) 12 1.9% 21 2.1% 100% Modulus (psi) 100% Modulus (7 days in H2Oat 70 Cl Ipsil 40 33 41 38 Tensile Strength (psi) Tensile Strength (7 days in H20 at 70 Cl Ipsil 104 102 99 157 % Elongation % Elongation (7 days in H20 at 70 Cl (psi) 365 665 475 835 . 0506771 TOWOLDMONOQ34334 FORMULATION Polysulfide ^ SRF Carbon Black Uncoaled CaCO^ 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 1,1 Thiokol's LP-32 I OS0877Z TOWOLDMONOQ34335 Santicizer 148 Santicizer 148 should give lower volatility in poly sulfides than Aroclor 2254. It is lower in viscosity. Santicizer 148 Santicizer 261 Vapor Pressure mm. Hg. (200o C) 0.54 1.00 Viscosity Centistokes (25 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. 0508/73 TOWOLDMON0034336 Polysulfide(t* Filler Plasticizer Lead Dioxide Santicizer 160 Stearic Acid : 100 ) ) r 30 ) ) : 25 I : 50 ) I : 45 ) ) : 5I Table 3 100 15 Plasticizer Aroclor 1254 Aroclor 1260 Aroclor 5460/Santicizer 160 (2/1) Aroclor 5460/Santicizer 26 f (2/1) Aroclor 5460/Santicizer 261 (1/1) Initial Hardness (24 Hour Cure) Shore A 28 30 30 29-30 26-27 (U Thiokol's LP-32 12) Activated carbon method Volatility % Plasticizer Lost (1 Day/ 87 C)(2) 7.5 4.7 4.5 4.0 4.5 0^0877'* TOWOLDMONOQ34337 Table 4 Santicizer 261 Santicizer 160 ( Aroclor 1248 ( Aroclor 1254 Viscosity (Centipoises) ffi HAT Brookfield at 23 C % Aroclor 5460 By Weight 33-1/3 50 67-2/3 ~ 670 - 9,700 ~ 440 ~ 4,000 300-400 cps ) ~ 458,000 ~ 375,000 : 12,000 cps ) 0508775 TOWOLDMONOQ34338 "Nothing contained herein It to be construed * recommendetion 1o use any product In conflict with any patent. MONSANTO MAKES NO WARRANTIES AS TO THE IITNESS OR MERCHANTABILITY Of ANY PRODUCTS fill ERRED 10. no guarantee ot Mtlstactory mutts (tom (alienee upon wnleined inloimelton ? itcommenSelions, and disclaims ell liability loi any mulling loss di damage." MONSANTO COMPANY. ORGANIC CHEMICALS OIVISION. 100 No. Lindbergh Blvd., St Louii, Mo. SS166 Akron, Ohio <4313 * MO Springtide Pi. Allinli, Gi. 30376* 341)0 Peachtree Rd., N.E. Boston, Miss. 03149. Eveiell Station Chltego, III. 60013* 3)S>B Des Plaines Ave, Dos Plaines. III. Cincinriiti, Ohio 46706. 1601 Madison Road Datroll, Mich. 4B736. 600 Northland Towns test Honolulu, Hawaii MB)? > 677 Ala Moans Blvd. Houslon, Te>. 770776061 Westhelmer Road Eos Angelas. Calif. 90077* 6670 1. Flotilla St. NEW ENGLAND AREA Hydrocarbons S Polymers Dir. 730 Worcester St., Indian Orchard, Mass. 01061 Plastic Products 6 Raslns Dlu. P. O. Bo 7130, Springfield, Mass. 01101 New York, N. Y. 10017. 777 ParkAve. St. Louis, Mo. 63166. S00 N. Lindbergh Blvd. SAN FRANCISCO BAY AREA 7710 Lafayette, Sanla Clara. Calil 9606? Seallle, Wash. 98171 . 711? Third Avenue Wilmington, Del. 19803* 7006 Concord Pike, Fairlai Monsanto 0606776 7-30G9-09 70-6 LITHO IN U.S.A. TOWOLDMONOQ34339