Article

Scratch resistant clearcoats based on polyurethane technology in automotive coatings

July 2013

Authors:

The wide variety of clear coatings has been adopted in automotive industry. Polyurethane clear coatings were established as one of the important technologies that achieve excellent film appearance, durability and chemical resistance. Clear coats have been required to improve not only film appearance, etch resistance but also scratch resistance. Scratch resistant clear coatings based on polyurethane technology have already entered the market. These clear coatings meet great scratch resistance caused by high cross- linked film with polyols and polyisocyanates. Polyisocyanates crosslink the polymer and have an influence to heal the scratch-damages. Especially, high functional polyisocyates are strongly effective to achieve excellent scratch resistance.

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Article

Full-text available

ISOCYANATES FOR COATINGS APPLICATIONS

January 1970

The article describes the chemistry of polyisocyanates for coatings applications starting from the basic principles and reactions in polyurethane (PUR) chemistry. The derivatization of diisocyanates to polyisocyanates with low residual monomer content suitable for coatings is discussed. Curing of the two component systems lead to PUR coatings with the known outstanding performance due to urethane ... [Show full abstract] linkages and intermolecular hydrogen bonding resulting in high chemical resistance and durability of the final film. Adjustment of components – polyisocyanates as well as polyols as reaction partners – is the basis of new developments of so called "self healing" PUR systems for coatings applications. Modern ,very high solids' coatings containing more than 90% non volatile components as well as hydrophilically modified hardeners for waterborne systems are the basis of highly efficient coatings and improvement of the ecological profile of the whole technology of surface protection. В статье описана химия полиизоцианатов с точки зрения их использовании в покрытиях, начиная с общих принципов и реакций в химии полиуретанов. Рассмотрена дериватизация диизоцианатов в полиизоцианаты с низким содержанием остаточного мономера, пригодные для использования в покрытиях. При отверждении двухкомпонентных систем образуются полиуретановые покрытия, которые известны своими исключительными эксплуатационными характеристиками благодаря уретановым группам и межмолекулярным водородным связям, которые обеспечивают высокую химическую устойчивость и износостойкость получаемых пленок. Подбор компонентов – полиизоцианатов, а также полиолов в качестве реагирующих веществ – лежит в основе новых разработок – так называемых «самовосстанавливающихся» полиуретановых соединений для использования в покрытиях. Современные высокотвердые покрытия с содержанием нелетучих компонентов более 90%, а также модифицированные гидрофильными соединениями отвердители для систем на водной основе – это базис для создания высокоэффективных покрытий и улучшения экологических характеристик технологии защитных покрытий в целом. Ключевые слова: полиизоцианат, полиуретан, изоцианат, полиол, покрытия.

Article

Resin modifiers push PUR-performance: Novel polyols improve performance of melamine crosslinked coat...

January 2013

New urethane polyols can be used as resin modifiers at moderate addition rates to improve mechanical and chemical properties in amino-formaldehyde crosslinked coatings. There are also often cost benefits to formulating with melamines. However, compared to polyisocyanate crosslinked urethane coatings, melamine crosslinked coatings may have limited environmental resistance. Polyisocyanate ... [Show full abstract] crosslinking produces polyurethane coatings that typically provide robust performance with superior environmental resistance properties. However, their drawbacks include issues with handling the material and higher cost compared to melamine systems. Primer helps smooth the metal surface, resulting in a more appealing reflective appearance. It provides a cushioning layer against the impact of road debris to reduce paint chipping. Finally, a primer works with the coating layers above and below it to improve overall corrosion resistance, adhesion and long-term weathering durability. Melamine crosslinked waterborne coatings are also increasingly becoming the systems of choice for formulators of automotive basecoats, particularly in Europe.