Highly functional natural material-derived epoxy resin, preparation method therefor, and epoxy resin curing composition using same

A natural ingredient-derived epoxy resin composition with water debonding property comprising:

• a natural material-derived epoxy resin represented by the following Formula 1, the natural material-derived epoxy resin being obtained by reacting a compound represented by Formula 2 with epichlorohydrin (ECH) obtained from glycerin as a starting material in the presence of a hydroxide salt;
• and
• a polyamide curing agent represented by the following formula 4:
• wherein n is a natural number of 0 to 300,
• wherein R and R′ are each independently H or CxHy, in which x and y are a natural number of 1 to 30.

A natural ingredient-derived epoxy resin composition with anti-fog property comprising:

• a natural material-derived epoxy resin represented by the following Formula 1, the natural material-derived epoxy resin being obtained by reacting a compound represented by Formula 2 with epichlorohydrin (ECH) obtained from glycerin as a starting material in the presence of a hydroxide salt;
• and
• a polyetheramine curing agent represented by the following formula 5:
• wherein n is a natural number of 0 to 300,
• wherein n is a natural number of 1 to 100.

A method of preparing the natural material-derived epoxy resin, the method comprising:

• a first step including mixing 550 to 650 parts by weight of epichlorohydrin (ECH) obtained from glycerin as a starting material with 100 parts by weight of a compound represented by the following Formula 2, dissolving the mixture at an elevated temperature of 60 to 75° C., adding 5 to 11 parts by weight of sodium hydroxide (NaOH) to 100 parts by weight of a compound represented by the following Formula 2 and conducting preliminary reaction for 2 to 4 hours:
• a second step including conducting main reaction of the reactants of the first step at a temperature of 60 to 75° C. and at a reduced pressure of 180 to 250 torr, the main reaction being carried out for 3 to 6 hours by adding 44 to 60 parts by weight of sodium hydroxide (NaOH) to 100 parts by weight of the compound represented by the following Formula 2;
• a third step including standing the reaction solution after reaction of the second step, separating the supernatant by reverse aliquoting and filtering the same;
• and
• a fourth step including collecting epichlorohydrin from the filtrate.
• wherein n is a natural number of 0 to 300,