Document GKJZ9KpRLRBm0X5Q9B5GXx447
CD * REV. t/tf
PROBREBS REPORT
ORGANIC CHEMICALS DIVISION
NCBrAKCN DEPT. . T. LOUIS, MO.
REPORTED BY
N. W. Touchette
: I:^d
Morgan Moorman
FOR
Sept. 1969
OETAILR
No
JOB NOB.
2-02-760.01-0455127
2
PROJECT
PLAS-55
Informtfion huruin if CONFIDENTIAL und it th* property of MONSANTO CHEMICAL COMPANY. Only Am* portions rolovont to o duly authorised person's nood to know my bn oicnrptnd for him. This document must not bo son! ovtsidn tbo Company without written approval and the authorised recipient is accountable for its Mfukoeping, escorpting or otherwise disclosing its contents and for its proper disposal. The document remains the property of MONSANTO CHEMICAL COM PANY and unless otherwise specifically authorised shall be returned within two months to Its source.
',
'_______________________.______________
DISTRIBUTION
STANDARD:
4tA. W.M. Coaker - Res 3 +J. A.Cannon - Res 3
*frj, R.Darby - Res 1 4R-. H. Mills - Res 3 '
_________________.____________.__________;_________*WITH DETAILS_________
*fJ. E. Springgate - G. 0. +C. P. Farley - G. 0. +P. R. Graham - G. 0. - +L. 0. Raether - G. 0.
PROJECT TITLE
EXPLORATORY AND FUNDAMENTAL STUDIES ON PLASTICIZERS
PROJECT OBJECTIVE
To develop plasticizers low in volatility and water sensitivity for calcium carbonate filled Thiokol polysulfide rubber sealant formulations.
Summary
Calcium carbonate filled polysulfide rubber formulations suffer from severe water sensitivity problems. A series of Monsanto commercial, and experimental plasticizers were tested in a typical formulation to determine if any significant performance variations could be iso lated. From the data obtained it appears that no plasticizer tested totally eliminated the problem but Santicizer 278 was generally the best material screened.
Plasticizers tested were:
Santicizer 278 -
s Santicizer 26l
Santicizer 160
Santicizer 902
Aroclor 1260
.
Aroclor 1254
Chlorowax 500
. HB 40
Bis(4-chlorobutyl) adipate
'
Bis(4-chlorobutyl) phthalate
`
DSW 588398
STLCOPCB4093734
2-02-760.01-0455127 (2)
Page Two
PLAS-55
The general formulation used was:
PHR Thiokol LP-32 100 \
c Plasticizer
H
15 and 40 vf
M CD
Non-coated CaC03
40
JPh
-wP Lead Dioxide
>5
1--l
Stearic Acid
c3
-OoP3 Sl60 or S-902
50 /\i 5
45 J
Sulfur
Formulation 100
15 0.1
The following points may be emphasized:
1. No system showed exceptional water resistance but Santieizer 278 and Chlorowax 500 were the best. Chlorowax 500 is incompatible in the Thiokol miscibility test.
2. When the samples are immersed in water, elongation and tensile increase but modulus decreases.
3. The Thiokol volatility specification is quite mild when run by their test method. If this specification is kept Aroclors now used should have little difficulty in meeting volatility requirements. Fogging is still an issue, however.
4. Probably the best method fb r attacking this problem would be by studying plasticizer/particle adsorption. If a plasticizer is found which selectively coats CaCC>3 to protect it from water, the problem could be greatly reduced.
ds 10/9/69
A. W. Morgan D. S. Moorman
DSW 588399
STLCOPCB4093735