Antifouling structure precursor, antifouling structure, surface modification composition and surface modification method

Abstract

A surface modification method for modifying a surface of an oxide includes: producing a surface modification composition; and applying the surface modification composition onto the surface of an oxide layer. In producing the surface modification composition, a modifier having a perfluoropolyether chain is mixed with a first modification accelerator containing an inorganic acid and a second modification accelerator containing at least one selected from the group consisting of a metal, a metal salt and an organometallic compound.

1 - 11 . (canceled) 
     
     
         12 . A surface modification method for modifying a surface of an oxide, the method comprising:
 producing a surface modification composition; and   applying the surface modification composition onto a surface of an oxide layer,
 wherein in producing the surface modification composition, a modifier having a perfluoropolyether chain is mixed with: 
 a first modification accelerator containing an inorganic acid; and 
 a second modification accelerator containing at least one selected from the group consisting of a metal, a metal salt and an organometallic compound. 
   
     
     
         13 . The surface modification method according to  claim 12 , wherein the surface modification composition is applied onto the surface of the oxide layer after an elapse of predetermined time from production of the surface modification composition. 
     
     
         14 . The surface modification method according to  claim 12 , wherein in producing the surface modification composition, the modifier having a perfluoropolyether chain is further mixed with water at the same time. 
     
     
         15 . The surface modification method according to  claim 12 , further comprising: adding water to the surface modification composition after producing the surface modification composition and before applying the surface modification composition onto the surface of the oxide layer. 
     
     
         16 . A surface modification composition, concurrently comprising:
 a modifier having a perfluoropolyether chain;   a first modification accelerator containing an inorganic acid; and   a second modification accelerator containing at least one selected from the group consisting of a metal, a metal salt and an organometallic compound.   
     
     
         17 . The surface modification composition according to  claim 16 , further comprising water. 
     
     
         18 . A surface modification composition set, comprising:
 a modifier having a perfluoropolyether chain;   a first modification accelerator containing an inorganic acid; and   a second modification accelerator containing at least one selected from the group consisting of a metal, a metal salt and an organometallic compound.   
     
     
         19 . An antifouling structure precursor, comprising:
 a modification layer that contains a modifier having a perfluoropolyether chain; and an oxide layer that has a surface entirely covered with the modification layer,
 wherein the modification layer is derived from a surface modification composition simultaneously including: 
   a modifier having a perfluoropolyether chain;   a first modification accelerator containing an inorganic acid; and   a second modification accelerator containing at least one selected from the group consisting of a metal, a metal salt and an organometallic compound,   has an uneven film thickness and comprises a comparatively thick area and a comparatively thin area that is dispersed in the comparatively thick area,   a coverage rate of covering the oxide layer with the comparatively thick area is equal to or greater than 10%,   the comparatively thick area is an area having a cohesion of 3.11 nN or more, and   the cohesion is measured by vertically moving a scanner of an atomic force microscope (AFM) on a surface of the antifouling structure precursor to obtain a force curve and quantitatively evaluating cohesion acting between a probe and a specimen from the force curve.   
     
     
         20 . The antifouling structure precursor according to  claim 19 ,
 wherein the comparatively thick area has the coverage rate within a range from 24.7% to 85.3%.   
     
     
         21 . An antifouling structure, comprising: an antifouling structure precursor, and a lubricant oil on a surface of the antifouling structure precursor,
 wherein the antifouling structure precursor comprises: a modification layer that contains a modifier having a perfluoropolyether chain; and an oxide layer that has a surface entirely covered with the modification layer,   the modification layer is derived from a surface modification composition simultaneously including:   a modifier having a perfluoropolyether chain;   a first modification accelerator containing an inorganic acid; and   a second modification accelerator containing at least one selected from the group consisting of a metal, a metal salt and an organometallic compound,   has uneven film thickness and comprises a comparatively thick area and a comparatively thin area dispersed in the comparatively thick area,   a coverage rate of covering the oxide layer with the comparatively thick area is equal to or greater than 10%,   the comparatively thick area is an area having a cohesion of 3.11 nN or more, and   the cohesion is measured by vertically moving a scanner of an atomic force microscope (AFM) on a surface of the antifouling structure precursor to obtain a force curve and quantitatively evaluating cohesion acting between a probe and a specimen from the force curve.   
     
     
         22 . The antifouling structure according to  claim 21 ,
 wherein the comparatively thick area has the coverage rate within a range from 24.7% to 85.3%.