Document v6E3Qr6LOQD8Z777vnvvobz1m

: -izW p!;a d \ i & <y? iii> U & ii La tly for Thiokol' polysu!fids liquid polymers TECHNICAL BULLETIN No. PL-331 APRIL 1962 Monsanto ST. LOUIS 65, MISSOURI OS'N 222038 STLCOPCB4073688 INTRODUCTION Thiokol* polysulfide liquid polymers, essentially difunctional mercaptans, are easily converted in-place to rubber-like materials. Cured polysulfide-based compounds are noted for their out standing oil and solvent resistance, excellent resistance to weathering (oxygen, ozone, and light), good electrical insulation properties, resilience, impermeability to gases, and a broad service-temperature range (from --55 to 175C). They are used in potting and casting com pounds, sealants, adhesives, coatings, and in combinations with epoxy and phenolic resins. The choice of materials and concentrations used in formulating finished compounds depends upon the requirements of the application. The purpose of this bulletin is to discuss several Monsanto modifiers that enable the formulator to reduce the cost of polysulfide-based com pounds without detracting appreciably from the useful characteristics of these compounds. We acknowledge, with thanks, the cooperation of the Thiokol Chemical Corp. in the prepara tion of this bulletin. CONTENTS MONSANTO MODIFIERS COMPATIBLE WITH POLYSULFIDES.................................. 1 PHYSICAL PROPERTIES OF MONSANTO MODIFIERS................................................... 2 MONSANTO SPECIFICATIONS ........ 4 POLYSULFIDE APPLICATIONS ................................................................................. 6 Joint-Sealant Compounds .................................................................... 6 Casting Compounds.......................................................................................................... 7 Flexible Polysulfide-Epoxy Formulations .................................................................. 7 Adhesives for Concrete....... ;............................................................ 8 TECHNICAL BULLETINS ON MONSANTOMODIFIERS.................................................... 8 The information contained in this bulletin is. to our best knowledge. true end accurate, but ell re commendations or suggestions are made without guarantee, since the conditions of use ere beyond our control. The Monsanto Chemical Company disclaims any liability incurred in connection with the use of these data or suagestions. Furthermore, nothing contained herein shall be construed as a recommendation to use any product in conflict with existing patents covering any material or its use. Thiokol. Registered trademark of the Thiokol Chemical Corp., Trenton, N. J. oS,n w39 STLCOPCB4073689 o MONSANTO MODIFIERS COMPATIBLE WITH POLYSULFIDES AROCLOR* Compounds The Aroclor chlorinated biphenyls and terphenyls are highly compatible with polysulfide liquid polymers and offer an attractive means of reducing formulation costs. Although the Aroclor compounds are compatible up to 100 PHR, the concentration to be used depends upon the handling and performance properties required in the finished com pound. The formulations shown in this bulletin suggest a maximum of 15 parts of Aroclor plasticizer for sealant compounds and a maximum of 40 parts for casting compounds. Liquid Aroclor compounds (such as Aroclor 1248) are used to give reduced casting vis cosity and higher filler levels, whereas the resinous and solid Aroclor compounds (such as Aroclor 5460) are useful where low volatility is desired. The 12 available Aroclor compounds offer a range of physical properties. HB-40* HB-40 hydrocarbon plasticizer is compatible with polysulfide liquid polymers up to 40 PHR. Like the Aroclor compounds, HB-40 offers reduced viscosity in formulation plus reduced costs. Dibutyl Phthalate Dibutyl Phthalate is also compatible up to 40 PHR and is used both as a plasticizer and as a grinding medium for the peroxide curing agents. SANTICIZER* M-17 Santicizer M-17 glycolate plasticizer is frequently used to give improved low-temperature characteristics in combination with the Aroclor compounds. Mod-Epox* Mod-Epox epoxy-resin modifier reduces viscosity of polysulfide-epoxy resin blends for easier handling and application; it also lowers the overall cost. Aroclor. HB-40. Mod-Epox. and Santicizer: Monsanto Chemical Company trademarks, registered in the U. S. Patent Office. DSVV 322040 STLCOPCB4073690 PHYSICAL PROPERTIES OF MONSANTO POLYSULFIDE-MODIFIERS f Property ' Molecular Weight..................................... Refractive Index, 25C............................ Density, 25C, lb./gal............................. Crystallizing Point, C............................... Pour Point, C........................................... Boiling Point, 760 mm Hg, C................ Vapor Pressure, mm Hg 150C ..................................... 200C ..................................... 300C ..................................... ViscosHy, cs......................................... 0C ....................................... 37.8C (100F).................... 2SC ....................................... S4.4C (130F).................... 98.9C (210F).................... Surface Tension, 20 C, dynes/cm., Rash Point, F.................................... Rre Point, F...................................... 'Specification Aroclor 1221 1.617-1.618 (20C) 9.85 1 275-320 *38-41 (SSU) 35-37 (SSU) 30-31 (SSU) 286-302 349 Aroclor 1242 1.627-1.629 (20C) 11.50 -- 19 325-366 *82-92 (SSU) 49-56 (SSU) 34-35 (SSU) 348-356 none to b.p. Aroclor 1254 1.639-1.641 (20C) 1 12.82 10 365-390 1800-2500 (SSU) 260-340 (SSU) *44-48 (SSU) none to b.p. none to b.p. DSW 322041 0 STLCOPCB4073691 AROCLOR 5460 -- 1.660-1.665 (20*C) 13.91 -- *98-105.5 (softening) 280-335 (5 mm Hg) % * -- -- none to b.p. none to b.p. HB-40 -- 1.5600-1.5750 8.37 --26 345-396 ,, Dibutyl Phthalate 278.34 1.4895-1.4915 8.72 < --35 --40 340.0 2 15 230 70.0 29.0 3.8 40.1 (25C) 345 385 1 ... 9 300 55.0 . ------ 15.6 2.4 35 340 395 Santicizer M-17 266.24 1.504 10.20 < -35 --26 310 0.5 8 600 1476 82.0 2.8 43.6 (25C) 380 -- Mod-Epox *1.587-1.590 9.83 25 360 11 (220C) --375 525 3 sw 322042 STLCOPCB4073692 MONSANTO SPECIFICATIONS Appearance .................................. Aroclor 1221 fcolorless mobile oil Acidity, meq. KOH/g................. Color. APHA........................... . Moisture (KF in methanol), %. Odor ................................... Specific Gravity, 2S/2SC........ f Not a specification 0.014 100 ------- 1.182-1.192 (25*C/15.5*C) Aroclor 1242 practically colorless, clear, mobile oil 0.010 100 50 (ppm) 1.381-1.392 (25715.5cC) AROCLOR 1254 flight-yellow viscous oil 0.010 100 50 (ppm) 1.495-1.505 (65*/15.5C) 4 DSW 322043 STLCOPCB4073693 0 AROCLOR 5460 dear, yellowto-amber, brittle resin or flakes to.os 2 (NPA) -- fl.670 > HB-40 Dibutyl ' Phfhalafe Santicizer M-17 fpractically colorless, . oily liquid . -----ISO 12S (ppm) JFaint, Characteristic 1.001-1.007 (25715.5*0 clear, water-white oily liquid with no sediment or turbidity dear, practically white, oily liquid, with no turbidity or sediment 0.12 20 0.1 S Slight, Characteristic 1.044-1.048 0.33 20 0.15 Slight, Characteristic 1.217-1.227 Mod-Epox oily liquid or light-yellow solid 0.2 (mgKOH/g) 150 -- 1.179-1.183 (30715.5*0 0 DSW 322044 STLCOPCB4073694 POLYSULFIDE APPLICATIONS Joint-Sealant Compounds Curtain-wall construction, which is growing rapidly, requires large quantities of permanently flexible, strongly adhering sealants. The Aroclor compounds have long been used as costreducing modifiers for polysulfide polymers in this and other construction applications. Seal ant compounds are also widely used to seal concrete joints in airport runways and to impart skid-resistant surfaces by bonding abrasive particles to highways and bridges. The following formulation illustrates the use of Aroclor 1232 in a joint-sealer formulation: JOINT-SEALANT COMPOUND FOR CURTAIN-WALL CONSTRUCTION Ingredienh Parts by Weight Thiokol LP-32 polysulfide Phenolic resin Aroclor 1232 Calcium carbonate Titanium dioxide Stearic acid Sulfur 100 5 5-15 40 10 1 0.1 C-5 paste (lead peroxide, 50%; dibutyl phthalate, 45%; stearic acid, 5%: passed three times through a tight paint mill.) 6 Properties Cast sheets, after cure of 7 days at room temperature: Tensile strength , psi Elongation, % Hardness, Shore "A" 150-250 500-700 30-40 SW 32204s STLCOPCB4073695 0 Casting Compounds Solvent-resistant gaskets of polysulfide polymers may be poured and cured in-place. Either dibutyl phthalate or Aroclor 1248 may be used to modify polysulfide casting compounds, as exemplified by the following starting formulation: Ingredients ' Thiokol LP-2 polysulfide Dibutyl phthalate (or Aroclor 1248) Zinc sulfide Sulfur C-5 paste (See previous formulation) Parts by Weight 100 20-40 40 0.1 15 Properties Cast sheets, after cure of 7 days at room temperature: Tensile strength, psi 150-200 Elongation, % 300-400 Hardness, Shore "A" 25-35 Flexible Polysulfide-Epoxy Formulations Epoxy resins are made flexible by modification with about equal amounts of polysulfide resins. The viscosity of the resulting formulation is markedly decreased, for easier handling and ap plication, by incorporation of Mod-Epox, which also permits the use of less epoxy curing agent, reduces the overall cost, increases bond strength, yet has very little effect on aging, as indicated by the following formulations: ROOM-TEMPERATURE AGING OF FLEXIBLE POLYSULFIDE-EPOXY FORMULATIONS ingredients Thiokol LP-3 Epon* 828 epoxy resin Mod-Epox Diethylenetriamine Parts by Weight 100 100 100 100 -- 25 12 8 Properties After cure at 23C for: 10 days 10 weeks Registered trademark of Shell Chemical Co. t Hardness, Rockwell --69R --35R --79R --32R , DSW 322046 STLCOPCB4073696 Adhesives for Concrete Formulations based on polysulfide liquid polymers and epoxy resins, and modified with Aroclor compounds or Mod-Epox, are frequently used as adhesives for concrete. These ad hesives are excellent for repairing and patching concrete floors and highways, and they permit fresh concrete to be bonded to old concrete. They are also used to bond pre-cast or broken concrete parts together, as well as metal parts to concrete. As concrete sealers, they speed hardening, curing, and dustproofing of fresh concrete; and they resist freeze-thaw, salt, and scraper damage to highways. TECHNICAL BULLETINS ON MONSANTO MODIFIERS Complete details of the properties, applications, and performance of the Monsanto modifiers for polysulfide liquid polymers are included in the following technical bulletins, which are available without obligation from Monsanto's Organic Chemicals Division, in St. Louis, or from any Dis trict Sales Office: Number PL-306 PL-40 PL-302 PL-17 PL-313 Title The Aroclor Plasticizers HB-40 Dibutyl Phthalate Santicizer M-17 Mod-Epox WFW:LSS-I.SkM:42 8 DSW 322047 STLCOPCB4073697 c t ST. LOUIS 86. MISSOURI AKRON ATLANTA BOSTON CHICAGO CINCINNATI CLEVELAND DETROIT HOUSTON LOS ANGELES MINNEAPOLIS NEW YORK PITTSBURGH SAN FRANCISCO S EATT LE SYRACUSE WILMINGTON MONSANTO CHEMICALS LTD. London MONSANTO CHEMICALS (AUSTRALIA) LTD. Melbourne MONSANTO (CANADA) LTD. Montreal Toronto Vancouver DSW 322048 STLCOPCB4073698