A polyurethane resin with paste activator, capable of providing useful bond strengths over the temperature range of -184 C to 149 C, is described. The adhesive system has a pot life of over one hour. Tensile shear strength ratings are given for various adhesive formulations

Stuckey, J. M.

English

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POLYURETHANE ADHESIVE WITH IMPROVED 
HIGH TEMPERATURE PROPERTIES 
James M. Stuckey 
Polymers and Composites Branch 
Materials and Processes Laboratory 
George C. Marshall Space Flight Center 
Marshall Space Flight Center, Alabama 35812 
149 
https://ntrs.nasa.gov/search.jsp?R=19770023338 2020-03-20T07:54:47+00:00Z
Dupont's Adiprene L-315 polyurethane resin with Hysol EA 9322 activator 
will cure at room temperature to give useful bond strengths over the temperature 
range of -184°C to +149"C (-300" F to +300° F) . The paste activator mixed with 
the liquid polyurethane resin provides an easily processible system with a pot 
life in excess of 1 h. 
1. TO BOND INSULATION ON AFT SKIRT OF THE SOLID ROCKET 
a. REFURBISHMENT 
EXTERNAL TANK 
a. HOT PRESSURIZING GASES MAY RAISE BONDLINE 
TEMPERATURE TO 177OC 
2. TO BOND INSTRUMENT ISLANDS ON THE LOX TANK OF THE 
0 PRIVATE INDUSTRY POTENTIAL INTEREST 
LINES THAT MAY BE 
Figure 1. Aerospace and private industry areas of potential interest. 
I HYSOL EA 9322 A/8* POLYURETHANE ADHESIVE 
FORMULATION 
EA 9322 A RESIN 
EA 9322 B ACTIVATOR (EMULSION) 
DOW CORNING D. C. 2-6040"" 
100 pt 
33.6 pt 
1.0 pt 
lpoT 4 hr 
TEST TEMPERATURE TENSILE SHEAR STRENGTH 
OC (OF 1 k N h 2  (psi) 
23.9 (75) 9720 (1410) 
93.3 (200) 3930 (570) 
148.9 (3001 NIL NIL 
* HYSOL DIVISION, THE DEXTER CORPORATION 
** GAMMA-GLYCIDQXYPRQPYL TRlME JHOXY SILANE 
OCH2CHCH20(CH2)3SI (OCH3)3 
Figure 2. Polyurethane adhesives investigated. 
f 50 
I DuPONT LIQUID URETHANE RESINS 1 
ADIPRENE L-100 ADIPRENE L-315* 
AVAILABLE ISOCYANATE CONTENT, % 4.10 kO.20 9.45 * 0.20 
CURING AGENT, MOCA**, PPH 11.5 29 
POT LIFE, MINUTES 1 20 1-3*** 
TENSILE STRENGTH, kN/m2 27 580 55 160 
(psi 1 (4000) (8000) 
HARDNESS, DUROMETER A 90 99+ 
DUROMETER D 43 79 
* DuPONT LIQUID URETHANE ELASTOMER 
* * 4,4'-ME THY LE NE-BIS- (2-CH LO RO AN I LINE 1-SUSPECTE D CARC I N OG EN 
*** POT LIFE IN EXCESS OF 1 h WHEN CURED WITH EA 9322B ACTIVATOR 
MATERIAL FORMULATION "A" FORMULATION " B  
ADIPRENE L-315 
EA 9322B (EMULSION) 
D.C. 2-6040 
CURE -
FORMULATION "A" 
72 h AT 71°C 
14 DAYS AT R.T. 
28 DAYS AT R.T. 
FORMULATION "B" 
72 h AT 71°C 
14 DAYS AT R.T. 
28 DAYS AT R.T. 
100 pt 
72 pt 
3 Pt 
100 pt 
60 pt 
3 Pt 
TENSILE SHEAR STRENGTH 
23.9'C (75'F) 93.3OC (200'F) 148.9'C (300°F 
kN/m2 (psi) kN/m2 (psi) kN/m2 (psi) 
14 130 (2050) 2620' (380)* 124** (18)'' 
10 960 (1590) 3590 (520) 2070 (300) 
12 200 (1770) 4270 (620) 2830 (410) 
17 170 (2490) 3520* (510)' 310" (45)** 
10 890 (1580) 3590 (520) 2480 (360) 
14 550 (2110) 5170 (750) 3100 (450) 
*TESTED AT 121.1"C (250°F) 
**TESTED AT 176.TC (35OoF) 
MATERIAL FORMULATION 
ADIPRENE L-100 100 pt 
EA 93228 (EMULSION) 34 Pt 
D.C. 2-6040 1.5 pt 
TENSILE SHEAR STRENGTH 
23.9'C (750F) 93.3OC (2OOoF) 148.9'C (300'F 
CURE k/Nrn2 (psi) kN/m2 (psi) kN/m2 (psi) 
48 h AT 71°C 9860 (1430) 4270 (620) 1310 (190) 
15 DAYS AT R.T. 7240 ( 1050) 3310 (480) 69 ( I O )  
Figure 2. (Continued). 
151 
I TENSILE SHEAR STRENGTH -CURED AT R.T. 1 
FORMULATION NO. 1 19 720 (2860) 4550 (660) 1100 (160) 
FORMULATION NO. 2 17 170 (2490) 3240 (470) 1140 (165) 
FORMULATION NO. 3 17 930 (2600) 4410 (640) 1240 ( 180) 
TEST TEMPERATURE L-315 FORMULATION "A" L-315 FORMULATION "B" L-100 FORMULATION 
O C  (OF) kN/m2 (psi) kN/m2 (psi) kN/m* (psi) 
-184.4 (-300) 34 060 (4940) 35 100 (5090) 36 270* (5260)' 
23.9 (75) 12 200 (1770) 14550 (2110) 7240 (1050) 
93.3 (200) 4 270 (620) 5 170 (750) 3310 (480) 
148.9 (300) 2 830 (41 0) 3 100 (450) 69 (10) 
176.7 (350) 34 (5) 55 (8) NIL NIL 
*ALL SPECIMENS BROKE IN HOLDING FIXTURE. 
Figure 2. (Concluded) . 
0 ADIPRENE L-315 WITH EA 9322 ACTIVATOR W I L L  CURE AT ROOM 
TEMPERATURE RANGE OF -184OC TO +149OC (-300°F TO +3OO0F) 
TEMPERATURE TO GIVE USEFUL BOND STRENGTHS OVER THE 
0 TO OBTAIN ANY STRENGTH AT 177OC (35OoF), AN EXTENDED CURE 
AT 7I0C (16OOF) OF APPROXIMATELY 150 h IS NEEDED 
0 THE PASTE ACTIVATOR MIXED WITH THE LIQUID POLYURETHANE 
RESIN PROVIDES AN EASILY PROCESSIBLE ADHESIVE SYSTEM WITI- 
A POT LIFE IN EXCESS OF 1 h 
Figure 3. Conclusions. 
152 


Polyurethane adhesive with improved high temperature properties

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