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Crosslink density and cure window of oligourethane diol/melamine high-solids coatings

  • Technical Articles
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Journal of Coatings Technology

Abstract

Oligourethane diols were crosslinked with melamine formaldehyde, and their crosslink density was determined by using an equilibrium swelling method. In formulations containing primary or secondary hydroxylated diol the major part of the crosslinker is consumed by transetherification reactions and self-condensation. The aromatic nature of TDI imparts rigidity while the aliphatic IPDI results in flexibility of the backbone chain of oligomer. The profile of cure schedules has been determined in the form of a cure window which measures the extent of reaction in terms of crosslink density as a function of bake temperature. The experimentally determined properties like tensile strength and MEK rub-resistance have been taken into consideration for fixing the lower and upper limits of XLD in designing the cure windows of individual coating formulations. The baking schedules of coatings have also been expressed in the form of nominal and true cure windows.

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Authors and Affiliations

  1. Indian Institute of Chemical Technology, India

    Syed Haseebuddin, K. V. S. N. Raju & M. Yaseen

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  1. Syed Haseebuddin
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  2. K. V. S. N. Raju
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  3. M. Yaseen
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Organic Coatings and Polymers Div., I.I.C.T., Hyderabad - 500 007, India.

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Haseebuddin, S., Raju, K.V.S.N. & Yaseen, M. Crosslink density and cure window of oligourethane diol/melamine high-solids coatings. Journal of Coatings Technology 70, 35–42 (1998). https://doi.org/10.1007/BF02697814

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