Wollastonite was inorganic modificated by coating aluminium silicate with heterogeneous deposition method.SEM, XRD, FTIR, BET surface area analyzer were used to characterize the product. XRD result shows that wollastonite is coated with nano-aluminium silicate. BET result shows that the specific surface area of particles increases by 200%. FTIR result shows that the content of OH group increases.Whiteness test shows that the whiteness increases by 2.0. Application test shows that the polypropelyne(PP) products filled with inorganic modificated powder have superior physical properties or mechanical properties(tensile strength 20.45Mpa, bending strength 38.02Mpa) than that with uncoated wollastonite and pure PP and the heat distortion tempeature increases by 28.6°C than pure PP.Inorganic modification of wollastonite can improve the joint interface between wollastonite and PP.
Some novel composites were prepared with polyamide 6(PA6) filled with wollastonite particles and wollastonite inorganic modified by aluminium silicate composite materials (WIMS) as fibrous fillers. Subsequently, these composites were investigated for tensile, charpy notched impact, bending strength, bending modulus and heat distortion temperature, and the mechanism of PA6 reinforced by WIMS was discussed through SEM photos of wollastonite and WIMS and the current two most popular equations: Pukanszky equation and Nielsen equation.The results show that the PA6 products filled with WIMS have superior mechanical properties(tensile strength 71.65Mpa, bending strength 106.61Mpa, bending modulus 3258.22Mpa) than that of uncoated wollastonite and pure PA6, and the heat distortion temperature increases by 88.6°C than pure PA6 and 17.2°C than wollastonite. Inorganic modification of wollastonite can improve the joint interface between wollastonite and PA6, thus improving their mechanical properties.
The changes of magnetic property of several iron bearing sulfide minerals after strong beam current electron irradiation are examined. Data shows that the magnetic susceptibility of arsenopyrite and chalcopyrite increases markedly compared to that of pyrite and marmatite. The magnetic susceptibility of arsenopyrite exceeds the lowest ferromagnetic limit 3000 cm3/g, while the susceptibility changes of other minerals are relatively slow. The irradiation dose is the dominate parameter determining the magnetic susceptibility change. Electron beam irradiation might be a potential method to enlarge the magnetic property distinction between the minerals for their magnetic separation.
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