Reflector and lighting apparatus using the same
A reflector of a lighting apparatus comprises a substrate and a coating layer located on a surface of the substrate. The coating layer is formed of a resin composition comprising an acrylic resin having at least one of a dimethylsiloxane group and a perfluoroalkyl group. Then, the coating layer is configured so that total surface free energy is less than or equal to 30 [mJ/m 2 ], and when the total surface free energy is divided into two components of a polar force component and a dispersion force component, surface free energy of the dispersion force component is less than or equal to 25 [mJ/m 2 ].
1. A reflector of a lighting apparatus comprising:
a substrate; and
a coating layer located on a surface of the substrate,
wherein the coating layer is formed of a resin composition comprising an acrylic resin having at least one of a dimethylsiloxane group and a perfluoroalkyl group as a side-chain in a molecular frame,
wherein the acrylic resin has a hydroxyl group as a cross-linking part,
wherein the resin composition includes a cross-linker component having at least one of an amino resin and an isocyanate resin as a cross-linker of the acrylic resin having the hydroxyl group, and
wherein the coating layer is configured so that total surface free energy is less than or equal to 30 [mJ/m 2 ], and when the total surface free energy is divided into two components of a polar force component and a dispersion force component, surface free energy of the dispersion force component is less than or equal to 25 [mJ/m 2 ].
2. The reflector as claimed in claim 1 , wherein a surface of the coating layer is configured so that a difference between an advanced contact angle and a receded contact angle of a water droplet is less than or equal to 20 degrees.
3. A lighting apparatus comprising the reflector as claimed in claim 1 .
4. A lighting apparatus comprising the reflector as claimed in claim 2 .