Development of a High-Durability Silver Mirror Coating System
- PDF / 2,819,883 Bytes
- 6 Pages / 612 x 792 pts (letter) Page_size
- 44 Downloads / 180 Views
Development of a High-Durability Silver Mirror Coating System
Satoru Hashimoto1, Teruyoshi O. Hirano2, Osamu Okitsu2, Tae-Youb Kim3, Shuichi Maeda4 1 HYOUKAKEN Co., Ltd., 1-8-4-905 Sakumachou, Chiyoda-ku, Tokyo, Japan. 2 GGK Co., Ltd., 1-17-7 Nishi-Shinbashi, Minato-ku, Tokyo, Japan. 3 Samsung Corning Precision Materials Co, Ltd., 544, myeomgam-ri, tamgeong-myeom, Asan, Republic of Korea. 4 Optical and Imaging Science & Technology, TOKAI University, 4-1-1 Kitakaname, Hiratsukashi, Kanagawa, Japan.
ABSTRACT A high-quality silver mirror coating technology capable of offering various colors for the decoration of molding items is desirable. We have developed both chemical reagents and procedures for improving the silver mirror coating layers. Treatment A with a sodium thiosulfate aqueous solution is a cleaning process for the silver layers. Treatment B with a water-based solution of silane coupling agent is a process for improving the adhesion property of mirror coating layers. Both treatments improve the durability of the silver mirror coating.
INTRODUCTION Silver mirror coating is a one of the most attractive coating and painting technologies. However, the silver mirror coating technology suffers from degradation due to oxidation of the silver layer. For industrial uses, including for example painting processes of mobile phones, flat panel displays, computers and other devices, the silver mirror coating layers prepared by the silver mirror coating technology require a very high durability. Currently, the durability of the silver mirror coating layers (MCLs) is insufficient for reliable industrial use. The metal finishing system (MFS[1], HYOUKAKEN Co., Ltd.) is a very promising mirror coating technology. We developed two kinds of chemical treatments for higher durability properties of MCLs prepared with the MFS. These treatments are able to produce MCLs which satisfy the required specifications for industrial use.
EXPERIMENT A) Silver Mirror Coating Technology The stack of the multi coated layers in the silver mirror coating technology (MFS) is shown in figure 1. The mirror coating layers (MCLs) consist of a “base coat”, an “Ag layer” and a “top coat”.
Figure 1 The stack structure of the Mirror Coating Layers (MCLs). We used the MFS (HYOUKAKEN Co., Ltd.) for preparing the MCLs. MFS is the brand name of our silver mirror coating technology. In the following, we describe the typical process of MFS. I) Base coat preparation The first step of the MFS process is base coating to obtain a good surface for the MCLs. If fine surface conditions can be obtained, any kind of traditional paint materials, such as for example, urethane, epoxy, acryl and any kinds of polymer materials for paints can be used. II) Ag layer preparation The second step of the MFS process is Ag-layer coating. Prior to Ag-layer coating, the surface of the molded items is cleaned with pure water and is activated with an activator solution. Then, the Ag solution and reduction material solution (Ag process solution A and solution B, those materials are p
Data Loading...
