Chemistry Reference
In-Depth Information
O
O
OH
O
O
C
OH
H
2
H
2
H
2
H
2
H
C
H
OH
O
+
+
H
2
C
C
O
C
C
O
C
H
C
O
C
O
C
C
C
CH
2
HN
HO
n
OH
n
O
O
HTME
PEG200
O
O
OH
O
O
C
OH
H
2
H
2
H
2
H
2
H
2
H
2
H
+
O
C
C
C
O
C
C
O
C
H
C
O
C
O
C
C
CH
C
NH
O
OH
HO
n
n
OH
HO
CH
3
COO
-
Figure 3.5
Synthesis of cationic polyol based on hydrogenated terpinene-maleic
ester type epoxy resin
Wu studied the crosslink reactions and crosslinked products of a cationic polyol
and polyisocyanate [10]. As shown in
Figure 3.6
, a two-component waterborne
polyurethane (2-K WPU) was prepared from a polyisocyanate (EC385) and a cationic
polyol. Particle size analysis showed that EC385 could be well-emulsified by the
cationic polyol in water. The emulsion with 31% 2-K WPU had a proper viscosity
to fit the painting application. Fourier transform infrared (FTIR) analysis indicated
that the crosslinking reactions of the cationic polyol with EC385 could be completed
in 5 h at 25 ℃.
Tables 3.3a
and
3.3b
show that the crosslinked product exhibited
excellent flexibility, adhesion, impact resistance, water resistance, alkali resistance
and alcohol resistance properties.
O
O
OH
O
O
C
OH
H
2
H
H
2
H
2
H
2
H
2
H
2
+
O
C
C
C
O
C
C
O
C
H
C
O
C
O
C
C
CH
C
NH
O
OH
HO
n
n
OH
HO
CH
3
COO
-
crosslink
+ waterbone polyisocyanate (EC385) + chain extender
crosslinked product
Figure 3.6
Two-component waterborne polyurethane prepared by mixing a
cationic polyol with polyisocyanate (EC385)
