| 摘要 |
PURPOSE: A record-keeping ink composition, which is not discolored or faded even though a long period of time being passed after recording and is harmless to human body, and a method for preparing thereof are provided. CONSTITUTION: The record-keeping ink composition comprises: (i) 30-50 parts by weight of distilled water; (ii) 10-30 parts by weight of ink absorption accelerating agent selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol and glycerin; (iii) 3-7 parts by weight of dye binder selected from the group consisting of amylodextrin, erythrodextrin, acrodextrin and maltodextrin; (iv) 3-8 parts by weight of viscosity controlling agent selected from the group consisting of ethyl alcohol, methyl alcohol and isopropyl alcohol; (v) 3-8 parts by weight of antiseptic selected from the group consisting of carbolic acid, salicylic acid and tannic acid; (vi) 3-7 parts by weight of aqueous binder resin selected from the group consisting of shellac, aqueous acrylic resin, aqueous urethane resin, aqueous epoxy resin and modified resins thereof; (vii) 5-15 parts by weight of fascicle binding adjuvant made of cellulose and benzoic acid; and (viii) 10-20 parts by weight of dye. The method comprises the steps of: (i) increasing the temperature of the alcohol selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol and dipropylene glycol to not less than 50 deg.C; (ii) dispersing 10-20 parts by weight of the dye and 3-7 parts by weight of the dextrin selected from the group consisting of amylodextrin, erythrodextrin, acrodextrin and maltodextrin in the alcohol; (iii) increasing the temperature of the distilled water to not less than 60 deg.C; (iv) dissolving 3-8 parts by weight of the acid selected from the group consisting of carbolic acid, salicylic acid and tannic acid in the distilled water of the step (iii) and slowly cooling down the solution to room temperature; (v) mixing the dispersion of the step (ii) with the solution of the step (iv); (vi) after adding 3-7 parts by weight of the resin selected from the group consisting of shellac, aqueous acrylic resin, aqueous urethane resin, aqueous epoxy resin and modified resins thereof and 5-15 parts by weight of the cellulose ester to the prepared mixture of the step (v), increasing the temperature of the mixture to not less than 50 deg.C; and (vii) cooling down the resultant material of the step (vi) to room temperature and then adding 3-15 parts by weight of the alcohol selected from the group consisting of ethyl alcohol, methyl alcohol and isopropyl alcohol.
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