Characterization, organic modification of wollastonite coated with nano-Mg(OH)2 and its application in filling PA6

• Wollastonite is first inorganic modified by coating nano-Mg(OH)2 and then organic modified with silane.
• Filling 30% of this composite powder in PA6 the mechanical properties, the heat distortion temperature and oxygen index of the PA6 composites were notably enhanced.

Nano-Mg(OH)2 was deposited on the surface of wollastonite (MW) powder with heterogeneous nucleation method and then modified with silane. The microstructure and surface properties of wollastonite (W) and MW powders were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectrometry (EDS) and X-ray diffraction (XRD), respectively. The microstructure of W, MW and silane modified MW (SMW) powders were characterized by Fourier translation infrared spectroscopy (FTIR). The mechanical properties, heat distortion temperature (HDT) and oxygen index (OI) of PA6 composites having different fillers were discussed. It was shown that the surface of wollastonite was coated with a layer of 33 nm thickness of Mg(OH)2 grains and the distribution of which was uniform. The number of the hydroxyl groups on the surface of wollastonite powder increased after coated with Mg(OH)2. Filling 30% of SMW powder in PA6 the mechanical properties, HDT and OI were notably enhanced.

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