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Thursday, 19 September 2019
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Raw materials & technologies, Technologies, Functional coatings

Multifunctional UV-cured acrylic coatings are antistatic and scratch resistant

Tuesday, 11 June 2013

Organic-inorganic hybrid acrylic coatings contain trialkoxy-silyl ammonium salt as antistatic additive and show scratch resistance.

The organic-inorganic hybrid acrylic coatings are antistatic and scratch resistant 

Source: Fischle

The organic-inorganic hybrid acrylic coatings are antistatic and scratch resistant 

Source: Fischle

Italian and Spanish researchers from the Politecnico di Torino (Turin, Italy), the Universidad del Pais Vasco/Euskal Herriko Unibertsitatea (San Sebastian, Spain) and the University of Modena and Reggio Emilia (Modena, Italy) have prepared organic-inorganic antistatic hybrid acrylic coatings.

Introduction of trialkoxy-silyl ammonium salt as antistatic additive

Trialkoxy-silyl ammonium salt was added to the photocurable formulations in order to introduce an antistatic additive which could be covalently linked to the hybrid network through a co-condensation reaction involving the alkoxy groups. The influence of the antistatic additive on the radical photopolymerisation reaction of the acrylic resin was evaluated by real time Fourier-Transformation-Infrared-Spectroscopy (FTIR). When the samples were cured under nitrogen atmosphere, a complete conversion of acrylic double bonds was achieved after 90 s of irradiation both for the acrylic resin and the formulations containing the ammonium salt.

Testing the scratch behaviour

The scratch behaviour of coatings was investigated by carrying out of progressive load scratch test. The penetration depth (pd) and the residual depth patterns were investigated for all the hybrid films. A consistent improvement of penetration resistance by increasing alkoxy-ammonium salt content was noted in terms of pd. Inorganic component and antistatic additives increase ε′ and σAC values of the hybrid coatings and decrease the resistivity ones, showing their efficiency for increasing antistatic properties of coatings, improved with respect to the pure acrylic resin.

This study was published in: Progress in Organic Coatings, Vol. 76, Issue 9, 2013, pp 1191–1196.

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