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Coatings Ingredients
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Coatings Ingredients
Article

Self-Healing Polyurethane Clearcoats

SpecialChem / Jul 1, 2009

Polyurethane coatings are the technology of choice for performance, beauty and low-temperature cure characteristics in automotive exterior applications. Two-component polyurethane coatings are inherently self-healing due to their unique chemistry, and they offer a number of intrinsic advantages that address customer and market requirements. These advantages include: ·high reactivity and full crosslinking, even at low-temperature curing; ·good chemical resistance and weather stability; ·hardness, toughness and elasticity due to urethane and urea structure; ·hydrogen bonds that allow for thermoplastic flow to relieve stress and allow self-healing of defects; ·basecoat compatibility; ·high solids/low VOC; and ·pleasing optical properties – a high gloss or “wet look.”The three main drivers for product development in the coatings market today are environmental, efficiency and quality. More stringent environmental regulations encourage formulators to develop coatings with higher solids and less VOCs. To offset the rising cost of raw materials, more efficiency in the paint process is needed and has resulted in faster curing systems and the reduction of paint layers.

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