High mechanical resistance, durable, fast drying and low VOCs Tough coatings for tough vehicle, equipment and machinery environments
Commercial vehicles are subject to severe conditions: airplane coatings must withstand extreme UV and temperature exposure; coatings for high-speed trains, trucks and buses have to cope with relentless stone damage; and agricultural, construction and earthmoving (ACE) equipment machines must endure harsh environments. The coatings must be just as tough.
High-performance coatings for large vehicles
Because of their large size, commercial vehicles frequently require a coatings method and system that differs from traditional automotive OEM coatings. It is here that water-based and solvent-based two-component polyurethane coatings can show their strength.
Drying rooms are often too small to handle large vehicles and ACE equipment. Therefore, large vehicle coatings must be able to dry at much lower temperatures, but without sacrificing performance. Furthermore, the coatings process needs to be very short – to minimize idle time – while also complying with stringent regional volatile organic compound (VOC) regulations.
New developments from Covestro in the field of waterborne two-component (2K) polyurethane dispersions enable formulation of low-VOC systems that offer users maximum freedom in the choice and quantity of co-solvent used.
Rapidly drying coating systems based on polyacrylates – and, in particular, with internally activated dispersions – significantly boosts production efficiency. Energy costs are decreased, meanwhile, due to lower oven temperatures (compared with standard systems) thereby improving CO2 balance without adverse effects on the processing time window.
Using Covestro coatings raw materials, the property profile of these new waterborne products with respect to gloss, drying and resistance is at a comparable level – and in some cases exceeds – those of solventborne systems.
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