MULTIFUNCTIONAL INTERPHASES IN ELECTROSTATIC COATING OF ELECTRICALLY NON-CONDUCTIVE MATERIALS
Journal Title: Journal of Machine Construction and Maintenance - Year 2018, Vol 111, Issue 4
Abstract
Solvent-based or waterborne coatings commonly used in surface finishing of plastic or composite-based products exhibit very low spray transfer efficiency, typically not exceeding 30–35%. Powder coatings, an attractive 100% solvent-free alternative technology, achieve up to 95–98% material utilization. However, they require electrostatic deposition of charged powder particles and hence can only be used on inherently conductive, e.g., metallic components. Overall, the key barriers for wide application of powder coating technology in plastics surface finishing are the non-conductive surfaces of plastics, inadequate adhesion to commodity plastics, and frequently the absence of low-temperature powder resins. This paper presents practical aspects of technology facilitating successful electrostatic powder coating of automotive and commodity plastics achievable through surface-grafted arrays of amino-functional molecules exhibiting inbuilt electron conductivity. This results in a 108-fold increase in surface conductivity of polymers combined with up to a 1000-fold increase of the strength of adhesion between adhesively bonded or surface-coated assemblies in comparison with unmodified substrates to the point of achieving 100% cohesive fracture of substrates. Industrial-scale technology trials using full size PP-based automotive components carried out by CSIRO and Dulux in a commercial powder coating facility demonstrated the suitability of this technology for industrial applications targeting the substitution of the current liquid paints by zero-waste powder coatings.
Authors and Affiliations
Wojciech S. GUTOWSKI, Con FILIPPOU, Sheng LI
Keywords
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