Document kMBg0OMwYD73zN3Rk1XN90ZB
for Thicker polysulfide liquid polymers
TECHNICAL BULLETIN No. F*33I APRIL 1962
If. louts 66. MISSOURI
LEXOLDMON003993
WATER PCB-SD0000007456
INTRODUCTION
Thiokpt* polysulfide liquid potymers, essentially difunctional mercaptans, are easily converted ln-plae to rubber-like materials. Cured polysulfide-based compounds are noted for tbeir out standing oil and solvent resistance, excellent resistance to weathering (otqrgen, o*one, and light), good electrical insulation properties, resilience, impermeability to gases, and a broad servka-temperature range (from --55 to 17SC). They are used in potting and casting com pound*, sealants, adhesives, coatings, and in combinations with epoxy and phenolic resins.
The choice of materials and concentrations used in formulating finished compounds depends upon Khe requirements of the plication. The purpose of this bulletin is to discuss several Monsanto modifiers that enable the formulator to reduce the cost of polysulfide-based com pound* 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 .......................................................... .
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POLYSULFIDE APPLICATIONS
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Joint-Sealant Compounds
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Catting Compounds.............,
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Flexible Polysulfide-Epoxy Formulations
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Adhesives for Concrete..........
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TECHNICAL BULLETINS ON MONSANTO MODIFIERS ...
8
Tha information contained in this bulletin it. to our bost knowledge, trua and ceurata, but oil r*. commendstions or suggestions ara m*da without guarantee. since tha conditions of vtt ara bavond yr control, Tha Monsanto Chamical Company disclaims any liability incurred in connaction with the lit of there data or suogestions.
Furthermore. nothing contained harein that! ba construed as a recommendation to usa any product l eenflict with existing patants covering any matarial or Us usa.
*TWko|i Registered trademark of the Thiokol Chemical Corpt Trenton. N. J.
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MONSANTO MODIFIERS COMPATIBLE WITH WLISiLFIIIS
AROCLOR* Compound*
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 IS parts of Aroclor plasticiser for sealant compounds and a maximum of 40 parts for casting compounds.
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Liquid Aroclor compounds (such as Aroclor 1248) are used to give reduced casting viscosity and higher filler levels, whereas the resinous and solid Aroclor compounds (such as Aroclor S460) are useful where low volatility is desired. The 12 available Aroclor compounds
offer a range of physical properties.
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HB-40*
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HB-40 hydrocarbon plasticiser is compatible with potysutfide liquid polymers up to 40 PHR. Like the Aroclor compounds, HB-40 offers reduced viscosity In formulation phis reduced easts,
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DIbutyl Mata!*
Dibutyl Phthalate Is also compatible up to 40 PHR and Is used both as a plasticiser and as
a grinding medium for the peroxide curing agents.
SANtICIZER* M-17
^
Santicuer M-17 giycolate plasticiser is frequently used to give improved tow-temperature characteristics in combination with the Aroclor compounds.
MOB*EK>X*
Moo-Epox epoxy-resin modifier reduces viscosity of polysulfide-epoxy resin blends for easier handling and application; it also lowers the overall cost.
*Aroolok, H1M0, Mob-Epo*. and Santiciser: Mowawo Chemical Company trademark#, regiteertd in the
V. &, Patent Oflice.
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PHYSICAL PROPERTIES OF MONSANTO POLYSULFIOE MODIFtERS
Property
Mofeesitaf Weight.. Refractive Index, 25C...--
Density, 25C, Ib./plBa4ftat>4aaaoaBaBBaa* Crystalling Point, C..... Pour Point,
Aroclor
mi
MI7-L618
(20*C)
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Bolling Point, 760 mm Hg, C...
275*320
Vapor Preititre, mm Hg I50C 20DC 300C
Vlieostty, cs< rc 374C (100F)
2S*C 54.4C (130F) 98.9C (210F)
Surface Tension, 20 C, dynes/cm....
Flesh Point, F,,
Rra Point F.#**B#*B***aBa*B**t*aB*B*****aB*
*38-41 (SSU)
3547 (SSU) 3041 (SSU)
186402 349
Specification
-
Aroclor 1242
1.627-1*629 (20*0 11.50 -19 325-366
*82-92 (SSU) 49-56 (SSU) 34-35 (SSU)
348-356 mam to b.p.
jARO&OR 1254
1.639-1,641 (20*C) * 12.82 10 365490
18)0-2500 (SSU) (SSU)
r(SSU)
to b.p. ttone to bp.
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35.0 --1$.(
1.4 ' SI - 340 395
Sawsozi* M-17
266.24 1504
1050 < --31
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310 .
05 8 MO
1476 -----82.0
25 43.6 (25C)
380 .--
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Arocuor 1221
^colorless mobile oil
Addlfye SQ$f|a
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MoMur* (KF in methanol^
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AltOCtOR 1242
practically colorless, dear, mobile oD
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10 (ppm)
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(J5*/tS.5*C)
Dibutyl Phthotat*
SANTSCEIt
M-17
clear, mterWte oily liquid with
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turbidity
dear, practically white, dly liquid, with as turbidity or sediment
0.12
0.15 SUghts Characteristic
1.044-1.048
0.35 20
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POLYSQLFIDE APPLICATIONS
Joint-Sealant Compounds
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Curfdn-wall construction, which Ss growing rapidly, requires large quantities of permanently
flexible, strongly adhering sealants. Tae Asocwr compounds have long bem wed as eoat-
redlining modifiers for polysulfide polymers in this and other construction applications. Seal ant compounds are also widely used t 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 Arocwr 1232 in a joint-sealer formulation:
JOINT-SEALANT COMPOUND FOR CURTAIN-WALL CONSTRUCTION
Ingredients
Paris by Weight
Tkfokol LP-32 polysulfide
Phenolic resin
Aroclor 1232
Calcium carbonate
Titanium dioxide
Stearic add
Sulfur
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100 5
5*15 40 10
i 0.1
C-S paste (lead peroxide, 50%; dibutyl phthalate, 45%; stearic add, 5%: passed three times through a tight P*dat mill.)
Properties
Cast sheets, after cure of 7 days at room temperature:
Tensile strength, psi
Elongation, %
Hardness, Store "A"
150-250 500-700 5048
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Casting Compounds
Solvea^resistant gaskets of polysulfide polymers may be poured and cured in-place. Either dibutyl phthalate or Aroclor 1248 may be used to modify polysulfide easting compounds, as exemplified by the following starting formulation:
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Thiokol LP-2 poiysulfide
Dibutyl phthalate (or Aroclor 1248) Zinc sulfide Sulfur C-5 paste (See previous formulation)
,
Parts by Weight
100 20-40 40
0.1
IS
Properties
Cast sheets, after cure of 7 days at room temperature:
Tensile strength, psi
150-200
Elongation, %
- 300400
. Hardness, Shore "A"
25-35
Flexible Polysufflde-Epoxy Formulations
Epoxy xesins 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 try the following formulations:
ROOM-TEMPERATURE AGING OF FLEXIBLE POLYSULFIDE-EPOXY FORMULATIONS
Ingredients
Tkhkol LP-3 Epm* 82$ epoxy resin
Mod-Epox Diethylenetriamine
Parts by Weight
100 100 --.
12
100 100 25
8
.
- Properties
After cure at ISC for: 10 dap 10 weeks -
^Registered tndemtrk of Shell Chemical Co.
.
Hardness, Rockwell
--69R
--35R
--70R
-32R
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Adhfrtves far Concrete
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Fonitalatl&as bused on potysulflde liquid polymers and epoxy resins, and modified with Aroclor compounds or Moo-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 ...
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Complete details of the properties, applications, and performance of the Monsanto modifiers for polySolfide 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
TtNe
The Abocior Plasticizers BB-W Dibutyl Phthalate Santicizer M-17
Mojj-Epox
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LEXOLDMON004002
WATER PCB-SD0000007465
ST. LOUIS S6, MISSOURI
AKRON ATLANTA OSTON CKICAOO CINCINNATI CLEVELAN P PETROIT HOUSTON LOS ANOELES MINNEAPOLIS NEW YORK MTTSSURGH SAN ERANCISCO j SEATTLE SYRACUSE WILMINGTON MONSANTO CHEMICALS LTP.
MONSANTO CHEM CALS (AUSTRALIA) LTP MONSANTO (CAN/ tjlAJ LTD.
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LEXOLDMON004003
WATER PCB-SD0000007466