Patent ID: 8367201
Filing Date: 2013-02-05
Classification: B05D,C08G,C09D,C23C,Y10T

Abstract:
1. A chromium-free rust-inhibitive surface treatment agent for metal parts with zinc surfaces consisting of an alcoholic solution of alkoxysilane oligomer having weight-averaged molecular weight of 1,000 to 10,000, wherein silicon atoms in molecules of the alkoxysilane oligomer are partly replaced with titanium atoms from an organic chelate titanium compound, the alcoholic solution contains titanium of 2.5 to 15 atomic % to a total amount of silicon and titanium, and the total amount of silicon and titanium is 5 to 20 weight % in the alcoholic solution when silicon and titanium are converted to SiO wherein the alcoholic solution of alkoxysilane oligomer is prepared by adding an acid catalyst and water to an alcoholic solution containing alkoxysilane raw material to hydrolyze and condensation-polymerize the alkoxysilane raw material to synthesize alkoxysilane oligomer, and mixing an organic chelate titanium compound with an alcoholic solution of the synthesized alkoxysilane oligomer, wherein the organic chelate titanium compound is titanium alkoxide in which 40 to 60% of alkoxy groups are blocked or replaced by octyleneglycol as a chelating agent.