Page 148 - Handbook of Adhesion Promoters

8.2 Alkyd resins 141

8.2 ALKYD RESINS

Silanes are most frequently used for the improvement of adhesion of alkyd resins to sub-
strates. The following silanes are suggested for this applications: amino-functional
(Chartwell B-515.71, W, WH, HRW; Chartwell B-515.72W and WX; Chartwell C-
515.71/1.5H, HR, and HRX; Chartwell C-515.71.HRM, HR, and HRX; Chartwell B-
515.71M, .4HR, .4WH, .2H) aromatic amine functional (Chartwell D-518.71HR) car-
boxy-functional (Chartwell F-525.3 and Chartwell C-531.1) diamino-functional
(Chartwell B-516.5W; Chartwell B-516; Chartwell B-516.71HRW and HRWX; Chartwell
C-516.72.HRX and HR, and Dow Corning Z-6121) hybrid carboxy/hydroxy functional
(Chartwell C-523.72HRW; Chartwell B-523.2W; Chartwell C-523.71HR; and Chartwell
C-523.2H) water-based (Chartwell B-515.71WM). Amine and diamine functionalities are
the best choices for alkyd resins. The suggested concentration range also varies widely
(0.35-3 wt%, most frequently 0.35 to 1.4 wt% is considered sufficient). The concentration
used varies depending on concentrations of resin, pigment, and anti-corrosive additive.
Titanium phosphates (Li M 0.25 Ti (PO ) where M = Mn, Co, or Ni) were used as
4 3
2
0.5
1
anticorrosive additives and adhesion promoters in alkyd coating. The addition of titanium
1
phosphates improved the anticorrosive resistance of alkyd. Water and oxygen permeabil-
1
ities were decreased and the adhesion strength to carbon steel was enhanced.
REFERENCES
1 Deyab, MA; Eddahaoui, K; Essehli, R; Benmokhtar, S; Rhadfi, T; De Riccardis, A; Mele, G,
J. Mol. Liquids, 216, 699-703, 2016.