플라즈마 활성화 표면처리 공정과 나노클레이 분산 적층 코팅을 이용한 표면 기능성 코팅 박막 개발 : 수분 및 산소 차단성이 우수한 투명 포장재
Development of surface functional coating thin film utilizing combined processes of plasma activation surface treatment and nanoclay dispersion: In applications for transparent water vapor and oxygen barrier packaging films
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수분 차단성이 우수한 투명 포장재용 배리어성 필름을 개발하기 위하여 , 상온 진공하에서 플라즈마 활성화 표면처리 공정의 전처리 공정을 거친 후에, 나노클레이 분산 적층 코팅층을 형성한다. 접착력 향상을 위한 코팅 공정의 적절한 가교공정과 최적분산공정을 통한 커플링 첨가제를 최적화하는 데 중점을 두었다. 기능성 코팅 박막에 대하여 분석한 결과는 수분 투과도 10g/m²/24 hrs(ASTM F-1249) 이하 , 산소 투과도 30 cc/m²/24 hrs(ASTM D3985) 이하임을 보여주었다 . 이는 종래의 무처리 필름의 10배 이상 수분 차단성이 우수한 투명 포장용 표면기능성 코팅박막에 해당됨을 보였다 . 아울러, 투명가스 차단 필름의 두께는 0.1mm 이내이며 , 투명가스차단 복합층은 2개의 층으로 구성되었다. PET 박막 계면 특성연구에서, FT-IR의 실험분석에 의하면 RDS 1.125 %에서 반응 활성도가 최적화임을 나타내고 있다 .
Abstract
Barrier films for transparent packaging materials with excellent moisture barrier properties are prepared, utilizing a nanoclay dispersion coating layer formed after a pretreatment process of plasma activation surface treatment process under vacuum at room temperature. Attention is paid on optimizing the coupling additive through the appropriate crosslinkingprocess and optimal dispersion process of the coating process to enhance adhesion. Analysis of the functional coating thin film shows that the water vapor transmission rate is less than 10 g/m²/24 hrs (ASTM F-1249) and the oxygen transmission rate is less than 30 cc/m²/24 hrs (ASTM D3985). It is shown that water barrier properties of coating thin film prepared in this study are greater than conventional untreated films by 10 times or more. The thickness of the transparent gas barrier film is within 0.1 mm, and the transparent gas barrier complex is implemented in two layers. In the study of PET thin filminterface characteristics, FT-IR experimental analysis shows the reaction activity was optimized at RDS 1.125 %.
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