에폭시 분체도료의 경화제 종류에 따른 물성에 관한 연구

박재홍; 신영조

Journal of the Korean Industrial and Engineering Chemistry, Vol.9, No.1, 58-65, February, 1998

Export Citation

에폭시 분체도료의 경화제 종류에 따른 물성에 관한 연구

A Study on the Properties of Epoxy Based Powder Coating with Various Curing Agents

박재홍, 신영조

초록

에폭시계 분체도료에 사용되고 있는 경화제로는 치환 dicyandiamide(Sub-DICY), 촉진 dicyandiamide(Acc-DICY), trimellitic anhydride(TMA), pyromellitic dianhydride(PMDA), Phenolic curing agent(Ph.C.A.)등이 사용되고 있다. 본 연구는 상기 5가지의 에폭시 경화제를 사용해서 제조한 에폭시 분체도료를 적합한 경화조건에서 완전히 경화시킨 뒤 여러 가지 실험기기 및 분석기기를 이용해서 경화된 도막 T_g, 인장강도, 파단신율, 경도, 내마모성등의 기계적 물성을 측정하였다. 그리고 흡수율, 내산성, 내알카리성등의 화학적물성, 전기적특성, 방식성등을 측정함으로써 경화제의 종류에 따른 에폭시 도막의 화학구조가 도막의 물성에 미치는 영향을 비교하였다. 그 결과 Phenolic curing agent는 toughness가 우수하지만 온도에 따른 색상 변화가 크고 산무수물 경화제는 전기절연성과 온도에 따른 색상안정성이 우수하지만 toughness와 부착성이 부족하고 DICY계는 흡수율과 온도에 따른 색상변화가 큰 특성을 나타내었다.

Substituted dicyandiamide(Sub-DICY), Accelerated dicyandiamide(Acc-DICY), Trimellitic anhydride(TMA), Pyromellitic dianhydride(PMDA) and Phenolic curing agent(Ph.C.A.) are mainly used for epoxy powder coating curing agent. Various characteristics of epoxy films fully cured by optimum condition such as mechanical properties like T_g, tensile strength, elongation at break hardness, abrasion resistance and chemical properties like water absorption, acid resistance, alkali resistance and electrical properties, corrosion resistance are determined by various measuring devices and analyses devices. In conclusion, phenolic curing agent was shown excellent thoughness but severe color change as temperature increased. Acid anhydride has excellent insulation properties and color stability at elevated temperature but lower thoughness and adhesion to substrate. DICY curing agent was shown high water absorption and severe color chance as temperature increased.

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[1] Lee H, Neville K, "Handbook of Epoxy Resins," McGraw-Hill, 5-1 (1980)

[2] Bate DA, "The Science of Powder Coating," SITA Technology, 1, 24 (1994)

[3] Clayton AM, "Epoxy Resin Chemistry and Technology," 2nd ed., 608, Marcel Dekker Inc. (1988)

[4] Gough LJ, Smith IT, J. Oil Colour Chem. Assoc., 43, 409 (1960)

[5] Funke, Bonit, J. Chem. Soc., 278 (1949)

[6] Culvener, J. Chem. Soc.-Chim. France, 1021 (1953)

[7] Flory PJ, Am. Chem. Soc., 78, 5222 (1956)

[8] Progelhof RC, Throne JL, "Polymer Engineering Principle," 41, Hanser/Gardeur Publication Inc. (1993)

[9] Nielsen LE, "Polymer Rheology," 75, Marcel Dekker Inc. (1977)

[10] Tobolsky AV, "Properties and Structure of Polymers," 125, Wiley, New York (1960)

[11] Maxwell J, Pethrich RA, J. Appl. Sci., 28, 2363 (1983)

[12] Saunder KJ, "Organic Polymer Chemistry," 2nd ed., 427, Chapman and Hall (1988)

[13] Misev TA, "Powder Coating Chemistry and Technology," 185, John Wiley & Sons, Ltd. (1991)

[14] Perera D, Eynde DV, J. Coat. Technol., 59, 55 (1987)

[15] Corcoran EM, J. Paint Technol., 41, 635 (1969)

[16] Shimbo M, Ochi M, Arai K, J. Coat. Technol., 56, 45 (1984)

[17] Shimbo M, Ochi M, Arai K, J. Coat. Technol., 57, 45 (1985)

[18] Perera D, Eynde DV, J. Coat. Technol., 53, 39 (1981)

[19] Aronson PD, J. Oil Colour Chem. Assoc., 57, 66 (1974)

[20] Sato K, Prog. Org. Coat., 8, 143 (1980)

[21] Pannenberg H, SPE, July, 669 (1965)