Water repellent film and component for vehicle including the film

Abstract

A water repellent film ( 200 ) according to the present invention includes a first layer ( 10 ) having a plurality of fine protrusions ( 100 ) on the surface thereof, a second layer ( 20 ) covering the fine protrusions ( 100 ) and having a water repellent property, and a third layer ( 30 ) provided on the surface of the first layer ( 10 ) on the opposite side of the fine protrusions ( 100 ). When a modulus of elasticity of the first layer ( 10 ) is defined as E1, a modulus of elasticity of the second layer ( 20 ) is defined as E2, and a modulus of elasticity of the third layer ( 30 ) is defined as E3, a definition of E2>E1>E3 is fulfilled. Accordingly, the water repellent film having excellent resistance to abrasion in which a fine structure is not easily abraded and damaged by an external friction force or the like can be obtained.

1 . A water repellent film, comprising:
 a first layer having a plurality of fine protrusions on a surface thereof;   a second layer covering the fine protrusions and having a water repellent property; and   a third layer provided on a surface of the first layer on an opposite side of the fine protrusions,   wherein when a modulus of elasticity of the first layer is defined as El, a modulus of elasticity of the second layer is defined as E2, and a modulus of elasticity of the third layer is defined as E3, a definition of E2>E1>E3 is fulfilled.   
     
     
         2 . The water repellent film according to  claim 1 , wherein a pitch of the fine protrusions is 380 nm or less. 
     
     
         3 . The water repellent film according to  claim 1 , wherein a height of the fine protrusions is 100 nm or more. 
     
     
         4 . The water repellent film according to  claim 1 , wherein a pitch of the fine protrusions is 150 nm or less. 
     
     
         5 . The water repellent film according to  claim 1 , wherein a height of the fine protrusions is 600 nm or less. 
     
     
         6 . The water repellent film according to  claim 1 , wherein a thickness of the third layer is larger than a thickness of the first layer. 
     
     
         7 . The water repellent film according to  claim 1 , wherein a thickness T3 of the third layer is 20 μm<T 3 <250 μm. 
     
     
         8 . The water repellent film according to  claim 1 , wherein an elongation at break E max  of the third layer is 50% or more. 
     
     
         9 . The water repellent film according to  claim 1 , wherein the modulus of elasticity of the first layer is between 0.1 GPa and 5 GPa, and the modulus of elasticity of the second layer is between 50 GPa and 210 GPa. 
     
     
         10 . The water repellent film according to  claim 1 , wherein the fine protrusions are formed into a cone or pyramid shape, or a frustum shape. 
     
     
         11 . The water repellent film according to  claim 1 , wherein the thickness of the first layer is between 1 μm and 30 μm, and a thickness of the second layer is between 1 nm and 30 nm. 
     
     
         12 . A component for a vehicle comprising the water repellent film according to  claim 1 . 
     
     
         13 . The water repellent film according to  claim 1 , wherein the first layer includes a material selected from the group consisting of a thermoplastic resin, a styrene elastomer, a urethane elastomer, a silicone elastomer, and gel material, and wherein the thermoplastic resin includes a material selected from the group consisting of a non-cross-linked acrylic resin, a cross-linked acrylic resin, a cross-linked acrylic-urethane copolymer, a cross-linked acrylic-elastomer copolymer, a silicone elastomer, cross-linked polyvinyl alcohol, polyvinylidene chloride, polyethylene terephthalate, polyvinyl chloride, polycarbonate, modified polyphenylene ether, polyphenylene sulfide, polyether ether ketone, a liquid crystal polymer, fluororesin, polyarylate, polysulfone, polyether sulfone, thermoplastic polyimide, polyamide imide and polyether imide. 
     
     
         14 . The water repellent film according to  claim 1 ,
 wherein the second layer includes a material selected from the group consisting of a transparent inorganic and a ceramic material,   wherein the transparent inorganic includes a material selected from the group consisting of glass, silicon oxide, and aluminum oxide, and   wherein the ceramic material includes a material selected from the group consisting of silicon nitride, magnesium oxide, titanium oxide, indium oxide, niobium oxide, zirconium oxide, zinc oxide, ITO, barium titanate, and hafnia.   
     
     
         15 . The water repellent film according to  claim 1 , wherein the third layer includes a material selected from the group consisting of a methacrylic film, a polyolefin film, a polycarbonate film, a polyester film, a vinyl chloride film, a silicone film, a polyvinyl alcohol (PVA) film, an ethylene vinyl acetate copolymer (EVA) film, a cellulose film, and an amide film,
 wherein the polyolefin film includes any one of polyethylene and polypropylene, and   wherein the polyester film includes a material selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and fluorene derivatives.