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Issue
Korean Chemical Engineering Research,
Vol.50, No.3, 427-434, 2012
알카리 금속염으로부터 대전방지용 수분산 폴리우레탄 코팅용액 제조
Preparation of Waterborne Polyurethane Coating Solutions with Antistatic Property from Alkali Metal Salts
홍민기, 김병석, 이용운, 송기창
Poly (carbonate diol)과 isophrone diisocyanate 그리고 dimethylol propionic acid로 부터 NCO/OH 몰 비를 0.8, 1.1, 1.3으로 각각 조절하여 수분산 폴리우레탄(waterborne polyurethane dispersion, PUD)을 합성하였다. 이 용액에 알카리 금속염인 LiClO4, NaClO4, KClO4를 첨가하여 대전방지용 수분산 폴리우레탄 코팅 용액을 제조하였다. 이 과정에서 첨가되는 알카리 금속염의 첨가량과 종류가 코팅 도막의 표면저항에 미치는 영향을 살펴보았다. 알카리 금속염의 첨가량이 증가될수록 코팅 도막의 표면저항은 감소하였다. 그러나 PUD에 같은 양의 알카리 금속염이 첨가될 경우에는 LiClO4>NaClO4>KClO4의 순서로 코팅 도막의 이온 전도도가 우수함을 알 수 있었다. 또한 PUD 내의 NCO/OH 몰 비가 증가함에 따라 코팅 도막의 표면저항이 증가하여 이온 전도도가 감소하였다.
Waterborne polyurethane dispersions (PUD) were synthesized from poly (carbonate diol), isophrone diisocyanate and dimethylol propionic acid at different NCO/OH molar ratios. Subsequently, the PUD was mixed with different types of alkali metal salts (LiClO4, NaClO4, and KClO4) to prepare antistatic waterborne polyurethane coating solutions. Effects of the types and amounts of alkali metal salts were investigated on the surface resistances of the resulting coating films. The surface resistances of coating films were decreased with increasing the amounts of alkali metal salts added in the PUD. The coating films prepared with the same amount of alkali metal salts showed increased ionic conductivity with the order of LiClO4>NaClO4>KClO4. Also, the surface resistances of coating films were increased with increasing the molar ratios of NCO/OH in the PUD.
Keywords: Waterborne Polyurethane; Antistatic Property; Surface Resistance; Alkali Metal Salts; Coating Solutions; Ionic Conductivity
[References]
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