M. Kitano et M. Shiojiri, BENARD CONVECTION ZNO RESIN LACQUER COATING - A NEW APPROACH TO ELECTROSTATIC DISSIPATIVE COATING/, Powder technology, 93(3), 1997, pp. 267-273
Coating of ZnO/resin composite films has been investigated by optical
microscopy, scanning electron microscopy and electromeasurement. Poly(
vinyl chloride)/poly(methyl methacrylate) lacquer mixed with either ne
edle like (N-) or tetrapod-like (T-) ZnO particles is spread in a 200
mu m thick layer on a glass sheet. Benard convection occurs in the coa
ting. N-ZnO particles flow along the convection streams, and are then
dispersively fixed within the cells but not at the boundaries. On the
other hand, T-ZnO particles aggregate in rings along the boundaries of
Benard cells. While the lacquer dries and solidifies, the rings of th
e T-ZnO particles are broken down into two or three pieces, and form a
network structure by meeting and parting among them. The T-ZnO/resin
composite films have a surface resistivity of 10(6) Omega/square or le
ss, and provide a good electrostatic dissipative coating. (C) 1997 Els
evier Science S.A.