Hard coating film using composition including epoxy siloxane resin and preparing method thereof

A method of preparing a hard-coating cured material, comprising:

• preparing a composition which includes Component A comprising a siloxane resin including an epoxy group and Component C comprising a cationic polymerization initiator,
• initiating the Component C in the composition to polymerize the composition, and
• forming the hard-coating cured material by performing a moisture-heat treatment at a temperature of about 50° C. or higher and in a relative humidity condition of about 60% or higher,
• wherein the Component A is represented by the following average unit Chemical Formula 1:
• (R1SiO3/2)a(R2O1/2)b(HO1/2)c;
• [Chemical Formula 1]
• wherein:
• R1 includes a member selected from the group consisting of a substitutable linear or branched C1-20 alkyl group, a substitutable linear or branched C2-20 alkenyl group, a substitutable linear or branched C2-20 alkynyl group, and a substitutable C6-20 aryl group;
• and at least 60% of an average of R1 includes a glycidyl group or alicyclic epoxy group,
• a substituent which may be substituted to R1 includes a member selected from the group consisting of a linear or branched C1-20 alkyl group, a C3-8 cycloalkyl group, a linear or branched C1-20 alkoxy group, an amino group, an acryl group, a methacryl group, a halogen, an allyl group, a mercapto group, an ether group, an ester group, a carbonyl group, a carboxyl group, a vinyl group, a nitro group, a sulfonyl group, a hydroxyl group, a cyclobutenyl group, an alkyd group, an urethane group, an oxetane group, a phenyl group, an epoxy group, and combinations thereof,
• R2 includes a linear or branched C1-7 alkyl group,
• a is a positive number,
• b is a zero or positive number,
• c is a zero or positive number, and
• (b+c)/a is a number in a range of from 0 to 0.4.