Chemistry Reference
In-Depth Information
Table 3.2 Properties of the crosslinked products of HTME-GA polyol
Salt water
resistance (4
days,
3% NaCl)
Drying
time
(min)
Impact
resistance
(50 cm)
Water
resistance
(4 days)
Curing
Agents
n(NCO):
n(OH)
Adhesion
(grade)
Flexibility
(mm)
Pencil
hardness
Alcohol resistance
(5 h, 50% ethanol)
Appearance
0.7:1
80
B, T
P
2
0.5
B
PD
D, F
P
EC385
0.9:1
80
B, T
P
1
0.5
HB
W
D, F
P
1.1:1
80
B, T
P
1
0.5
HB
W
PD
P
1.3:1
60
B, T
P
1
0.5
H
RW
PD
P
0.7:1 60 B, T P 2 10 H PD PD P
0.9:1 60 B, T P 2 10 2H RW W P
1.1:1 50 B, T P 2 10 3H RW W P
1.3:1 40 B, T P 1 10 3H P P P
B brilliant; T transparent; P pass; PD partly dissolved; W whitening; RW recovered after whitening; D dissolved; F falling off.
Impact resistance (50 cm) was tested according to GB 1732-93, P means the coatings will not crack after the impact of a
hammer falling freely from a height of 50 cm. Adhesion (grade) was tested according to GB 1702-93; grade 1 is the best
grade 7 is the worst. Flexibility (mm) was tested according to GB 1731-93, evaluated by the diameter of the mandrels; 0.5
mm is the best, 15 mm is the worst. Pencil hardness was tested according to GB 6739-69, evaluated by the symbols used to
describe a pencil's hardness. Resistance to liquids was tested according to GB 9274-88; P means that the specimens will not
crinkle or whiten after being completely immersed in the liquids at 23
o
C
for a speciied interval.
Data adapted from reference [8]
HN90T
