SEMICOSIL® 936 UV
SEMICOSIL® 936 UV is an RTV-1 amine cure system that cures on contact with moisture in the air and/or through exposure to high energy ultraviolet light.
特性
- Rapid UV acceleration
- Shadow cure
SEMICOSIL® 936 UV is intended as a protective coating for both rigid and flexible printed circuitry containing conventional or surface mounted devices. The performance of SEMICOSIL® 936 UV is dependent upon many factors, including the application method, the thickness of the layer deposited, the substrate, the curing atmosphere, and the curing cycle. Surface Preparation The surface to be coated should be clean and free of dirt and other contaminants. SEMICOSIL® 936 UV is not recommended for use with acrylic or polycarbonate substrates. Application SEMICOSIL® 936 UV may be applied by dipping, spraying, or brushing. Application equipment may be cleaned using organic solvents such as mineral spirits. All traces of solvent should be removed from application equipment before using SEMICOSIL® 936 UV.
Because SEMICOSIL® 936 UV begins to cure on contact with atmospheric moisture, all containers should be tightly closed in lightproof containers when not in use. Dip tanks should be no more than half full and blanketed with a dry, inert gas such as nitrogen. If a skin should form over the surface it may be removed by careful skimming. Spray equipment and brushes should be washed and wiped clean with organic solvents such as naphtha or mineral spirits after use.
A 5 second exposure with a D bulb at an intensity of 0.7 W/cm2 cures a 2 mil coating in less than one minute. A shorter exposure time can be achieved with achieved with higher intensities. The actual time for a given application should be determined on an individual basis. The adhesion of SEMICOSIL® 936 UV to most substrates can be enhanced by a 30 second to one minute preheat cycle at 60-70 °C before exposure to the UV source.
储存
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