reaction (short pot life),t hey are mixed in an externally mixing or dualheadedspray gun. After being mixed and applied, arelatively fast reaction
takes place, resulting in cross-linking and polymerization of the monomeric
styrene with the polyester resin.
Another class of coatings, formulated in as imilar manner,a re the vinyl
esters,T he vinyl esters derive from ar esin based on ar eactive end vinyl
group that can opena nd polymerize. The chemical structurei ss hown in
Figure 7.22.
7.13.1.1.7 Autooxidative Cross-Linking Coatings
Autooxidative cross-linking coatings rely on ad rying oil with oxygen to
introducec ross-linkingw ithint he resin anda ttainment of final film
CCO
C
H
HO
CO
O
C
H
H
O
C
H
OH
C
H
n
H
C
H
H
H H
H
C
H
OH
CH
H
H
H
CH
H
O C C C
FIGURE 7.22
Chemical structureo fvinyl acetate coating.
OH CCC
HH
C
CC
OCO
H
C
OCOC
C
H
C
C
CCC
C
H H
C
C
HH
OCCO H
H H
HH
HH
n
n =3− 6
FIGURE 7.21
Chemical structureo fpolyester coating.
Coatings
465
CAT8247—CHAPTER 7—17/10/2006—15:03—TRGANESH—XMLM ODEL B–pp. 403–485
takes place, resulting in cross-linking and polymerization of the monomeric
styrene with the polyester resin.
Another class of coatings, formulated in as imilar manner,a re the vinyl
esters,T he vinyl esters derive from ar esin based on ar eactive end vinyl
group that can opena nd polymerize. The chemical structurei ss hown in
Figure 7.22.
7.13.1.1.7 Autooxidative Cross-Linking Coatings
Autooxidative cross-linking coatings rely on ad rying oil with oxygen to
introducec ross-linkingw ithint he resin anda ttainment of final film
CCO
C
H
HO
CO
O
C
H
H
O
C
H
OH
C
H
n
H
C
H
H
H H
H
C
H
OH
CH
H
H
H
CH
H
O C C C
FIGURE 7.22
Chemical structureo fvinyl acetate coating.
OH CCC
HH
C
CC
OCO
H
C
OCOC
C
H
C
C
CCC
C
H H
C
C
HH
OCCO H
H H
HH
HH
n
n =3− 6
FIGURE 7.21
Chemical structureo fpolyester coating.
Coatings
465
CAT8247—CHAPTER 7—17/10/2006—15:03—TRGANESH—XMLM ODEL B–pp. 403–485