Composition
Description
|
|
Thiokol Chemical Corp. |
Thiokol Chemical Corp. |
Thiokol Chemical Corp. |
Thiokol Chemical Corp. |
|
name |
LP-31 |
LP-2 |
LP-32 |
|
|
Thiokol LP |
100 |
100 |
100 |
|
|
Lead peroxide |
|
|
|
50 |
|
0.15 |
|
0.1 |
|
|
|
Carbon black |
|
30 |
30 |
|
|
Stearic acid |
1 |
1 |
1 |
5 |
|
Dibutyl phthalate |
|
|
|
45 |
|
Soot (or zinc sulfide or lithopone) |
30-50 |
|
|
|
These propellants are based on polyethylene sulfide rubbers mixed with ammonium perchlorate. According to the Thiokol Cehmical Corporation, liquid thiokol is produced by condensing ethylene chlorohydrin to dichlorodiethylformal, which is then treated with sodium polysulfide to obtain the finished product.
The proportion for liquid thiokol to perchlorate is usually 20-40% thiokol to 60-80% perchlorate. There are six types of thiokol liquid polymer (LP): LP-2, LP-3, LP-31, LP-32, LP-33, and LP-8. According to Urbanski, the difference in the polymers lies in the degree of polymerization or cross-linking. Curing the thiokol polymers is done with a special curing compound, composition C, for 24 hours at 80oF, then pressed for 10 minutes at 287-310oF.. Proportions for LP to C is 100 parts LP to 10-15 parts C.
The table for the liquid polymers is in parts by weight. The table for composition C is in percent