Two-component isocyanate cured acrylics for plastics

Two-component Isocyanate Cured Acrylics for Plastics by Chris Langham LTSC 

Manfred Schdnfelder illustrated the effects of polyurethane finishes on the mechanical properties of the plastic. The abstract describes the propagation of a crack from the coating through to the plastic substrate. 

The formation and growth of cracks can be impeded and hence the damage to the component restricted, by a variety of methods  

Ideally the flexibility of the substrate and polymer should be matched e.g. RIM (reaction injection moulded) polyurethane requires a more flexible system than ABS (acrylonitrile-butadiene-styrene). 

As a one coat finish for plastics, acrylic urethanes have one major limitation, the aggressive solvent content of the acrylic and the polyisocyanate resins themselves. This limits their use to coatings for thermosetting substrates and a small number of TPA substrates such as ABS, PA (polyamide), RIM polyurethane and PPO (jmlyphenylene oxide). Even then, the system should be evaluated to ensure that no degradation of the plastic s impact resistance has taken place. Consult the TPA chapter for discussion on plastic substrates. 

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See also in sourсe #XX -- [ ]

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