수팽윤성 점토를 함유한 수성코팅제의 제조 및 인쇄지 코팅특성

이석기; 김명철; 이병교; Suk Kee Lee; Myung Chul Kim; Byung Kyo Lee

Journal of the Korean Industrial and Engineering Chemistry, Vol.12, No.2, 229-234, April, 2001

Export Citation

수팽윤성 점토를 함유한 수성코팅제의 제조 및 인쇄지 코팅특성

Preparation of Waterborne Coatings Containing Water Swellable Clay and Its Characteristics of the Printed-paper Coating

이석기^†, 김명철¹, 이병교²

경일대학교 공업화학과, 경산 712-701
¹경일대학교 교양학부, 경산 712-701
²경북대학교 무기재료공학과, 대구 702-701

Suk Kee Lee^†, Myung Chul Kim¹, and Byung Kyo Lee²

Department of Industrial Chemistry, Kyungil University, Kyungsan 712-701, Korea
¹College of General Education, Kyungil University, Kyungsan 712-701, Korea
²Department of Inorganic Materials Engineering, Kyungpook National University, Taegu 702-701, Korea

E-mail:

초록

수팽윤성 점토로 벤토나이트와 합성헥토라이트(SHEC), 아크릴계 라텍스 및 각종 코팅첨가제를 배합하여 수성코팅제 (WBC) 4종을 제조하였다. 제조한 WBC의 유동학적 성질 및 WBC로 주조된 필름의 성질을 측정하였고, 또한 인쇄지용 WBC로서 코팅된 인쇄지 도막의 물성을 조사하였다. SHEC를 함유한 WBC-3 및 WBC-4는 전단력에 따라 졸과 겔의 상전이 현상, 즉 요변성(thixotropy)을 나타냄으로서 분산안정성 및 저장안정성이 우수하였다. 수팽윤성 점토가 함유된 WBC 필름의 초기분해온도와 투명성은 시판 MC-21W의 필름보다 각각 32.2∼54.7℃와 5.9∼7.4%의 범위로 증가한 결과를 나타내었다. 제조한 WBC로부터 코팅된 인쇄지 도막의 표면상태를 관찰한 결과, 수팽윤성 점토의 domain 크기는 다음의 순서 즉 WBC-4 > WBC-3 > WBC-2로 감소하였다. WBC로 코팅된 인쇄지 도막의 내수성은 MC-21W < WBC-4 < WBC-3 < WBC-2 < WBC-1의 순서로, 부착력은 MC-21W < WBC-2 ≤ WBC-4 = WBC-3 ≤ WBC-1의 순서로 각각 증가하였다. 이상의 결과들로부터 SHEC가 8 phr포함된 WBC-4가 인쇄지용 WBC로서 내수성을 제외하고 가장 우수한 코팅물성을 나타내었다.

Four different composition of waterborne coatings (WBC) were prepared by compounding of bentonite and synthetic hectorite (SHEC), a water swellable clay, with arcylic latex and coating additives. The rheological properties of WBC and the properties of the films casted by WBC were measured. The physical properties of the film surface of WBC on a printed paper were also investigated. WBC-3 and WBC-4 containing SHEC showed the phase transition of sol and gel with the shear rate, the thixotropic property, and accordingly, the dispersion and storage stability increased. The initial decomposition temperature and the transmittance of WBC films, which contained the water swellable clay, increased in range of 32.2∼54.7 ℃, and this was 5.9∼7.4% more than the commercial MC-21W. The domain size of water swellable clay in the WBC films decreased in the order of WBC-4>WBC-3>WBC-2. The water-resistance and the adhesion force of the film on the coated paper increased in the following order: MC-21W

Keywords:Water swellable clay;Acrylic latex;Waterborne coatings;Thickener;Printed-paper coating

[References]

Smith JC, Shirley Institute Bull., 44(3), 74 (1971)
Koo KM, Kim HW, Jeon IR, Lee SK, J. Korean Ind. Eng. Chem., 11(2), 163 (2000)
Coyle DJ, "Morden Coating and Drying Technology", eds. E.D. Cohen and E.B. Gutoff, 1, 63, VCH Publishers, New York (1992)
Kheboian GI, "Coating and Drying Defects", eds. E.B. Gutoff and E.D. Cohen, 1, 210, John Wiley & Sons, New York (1995)
Neumann BS, Sansom KG, Clay Minerals, 8, 398 (1970)
Theng BKG, "Formation and Properties of Clay-Polymer Complexes", 1, 1, Elsevier, New York (1979)
Jenness PK, "Water-borne Coatings and Additives", eds. D.R. Karsa and W.D. Davies, 217, The Royal Society of Chemistry, UK (1995)
Alexander W, "Hydrogen Enriched Water Swellable Clay Having Reduced Acid Demand and Stable at Low pH," U.S. Patent 4,514,510 (1985)
McCarthy DC, Taber DC, Bowers DD, "Synthetic Hectorite Coated Flexible Film", U.S. Patent, 5,523,338 (1996)
Torii K, Iwasaki T, Clay Science, 6, 1 (1987)
Lee SK, Koo KM, Lee JH, Lee BK, J. Korean Ceram. Soc., 37(12), 1131 (2000)
Doren K, Freitag W, Stoye D, "Water-Borne Coatings", 53, Hanser Publishers, Munich Vienna New York (1994)
Brock T, Groteklaes M, Mischke P, "European Coatings Handbook", ed. U. Zorll, 16, Vincentz Verlag, Hannover (2000)
일본산업규격 JIS Z1522, "바둑판 모양의 부착력 시험방법"

[1] Smith JC, Shirley Institute Bull., 44(3), 74 (1971)

[2] Koo KM, Kim HW, Jeon IR, Lee SK, J. Korean Ind. Eng. Chem., 11(2), 163 (2000)

[3] Coyle DJ, "Morden Coating and Drying Technology", eds. E.D. Cohen and E.B. Gutoff, 1, 63, VCH Publishers, New York (1992)

[4] Kheboian GI, "Coating and Drying Defects", eds. E.B. Gutoff and E.D. Cohen, 1, 210, John Wiley & Sons, New York (1995)

[5] Neumann BS, Sansom KG, Clay Minerals, 8, 398 (1970)

[6] Theng BKG, "Formation and Properties of Clay-Polymer Complexes", 1, 1, Elsevier, New York (1979)

[7] Jenness PK, "Water-borne Coatings and Additives", eds. D.R. Karsa and W.D. Davies, 217, The Royal Society of Chemistry, UK (1995)

[8] Alexander W, "Hydrogen Enriched Water Swellable Clay Having Reduced Acid Demand and Stable at Low pH," U.S. Patent 4,514,510 (1985)

[9] McCarthy DC, Taber DC, Bowers DD, "Synthetic Hectorite Coated Flexible Film", U.S. Patent, 5,523,338 (1996)

[10] Torii K, Iwasaki T, Clay Science, 6, 1 (1987)

[11] Lee SK, Koo KM, Lee JH, Lee BK, J. Korean Ceram. Soc., 37(12), 1131 (2000)

[12] Doren K, Freitag W, Stoye D, "Water-Borne Coatings", 53, Hanser Publishers, Munich Vienna New York (1994)

[13] Brock T, Groteklaes M, Mischke P, "European Coatings Handbook", ed. U. Zorll, 16, Vincentz Verlag, Hannover (2000)

[14] 일본산업규격 JIS Z1522, "바둑판 모양의 부착력 시험방법"