| 摘要 |
A method for preparing a nanosilver pigment master batch is provided to allow dyeing of a resin or plastic while imparting excellent antibacterial property and volatility to the resin or plastic. A method for preparing a nanosilver pigment master batch comprises the steps of: (i) introducing 300 g of silver ingot into a dissolution container, adding nitric acid thereto to dissolve silver, agitating the resultant silver solution with 100 g of stannous chloride dissolved in 100 ml of hydrochloric acid, adding 150 g of zinc oxide dissolved in 500 g of caustic soda solution(pH 13) to the silver solution to adjust the pH into a neutral pH of 7.5, evaporating water from the neutralized solution to obtain a silver salt as powder, dissolving 150 g of the silver salt into 300 ml of water, adding 150 ml of hydrogen peroxide thereto to perform vigorous decomposition of silver and to obtain a silver solution, and mixing 600 g of the silver solution with 200 ml of ethyl alcohol and 200 ml of isopropyl alcohol to obtain a nanosilver solution; (ii) impregnating 1,000 g of a pigment with 1,000 g of the nanosilver solution, followed by drying and re-pulverizing it to obtain 1,000 g of a nanosilver pigment; (iii) mixing 1,000 g of a polyethylene resin with 300 g of the nanosilver pigment and metering the nanosilver pigment; (iv) introducing and mixing the resin and nanosilver pigment in an extruder, extruding the composition, and cooling the extruded composition in the form of multiple strands with a thickness of 2 mm or higher, followed by cutting them into chips with a diameter of 2 mm and a length of 3 mm.
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