Chemistry Reference
In-Depth Information
Table 3.1 Properties of the crosslinked products of the polyols from HTME
Item
HTME-DEA
HTME-MEA
HTME-DeA
Drying time (h) at 25 °C
1
2
0.5
Brilliant and
transparent
Brilliant and
transparent
Brilliant and
transparent
Appearance
Gloss (60°)
92.2
86.3
91.4
Impact resistance (50 cm)
Pass
Pass
Pass
Adhesion (grade)
2
1
1
Flexibility (mm)
0.5
0.5
0.5
Pencil hardness
H-2H
H
HB
Water resistance (4 days)
Pass
Pass
Pass
Salt water resistance (4
days, 3% NaCl)
Pass
Pass
Pass
Alcohol resistance (5 h,
50% ethanol)
Pass
Pass
Pass
* Impact resistance (50 cm) was tested according to GB 1732-93; Pass means the
coatings will not crack after the impact of a hammer falling freely from a height of
50 cm; this means the coating is better. 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; Pass means that the specimens will not crinkle
or whiten after being completely immersed in the liquids at 23
o
C for a specified
interval.
Data adapted from reference [7]
