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| Characterization of Wollastonite Modified with Acid & Alkaline Two-step Method and the Influences of Its Application on Paper Properties |
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| DOI：10.11980/j.issn.0254-508X.2014.12.002 |
| Key Words:wollastonite acid & alkali two-step method filler modification |
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| Abstract:In order to improve application effect of wollastonite in papermaking industry, the modification of wollastonite with acid & alkaline two-step method was investigated. The modification process included two steps: firstly sulfuric acid was mixed with wollastonite to result in partly dissolution of wollastonite particles, then pH was adjusted to alkalinity by adding alkaline so as to redeposit dissolved substances on the surface of the wollastonite particles. The loose porous covering layer was formed on the surface of wollastonite particle while original acicular morphology was maintained. The modified wollastonite possessed bigger particle size and higher brightness than the unmodified sample. The paper properties filled with modified wollastonite were superior to those filled with unmodified wollastonite: higher brightness, bulkier, less mechanical strength reduction. Although retention rate of modified wollastonite was a little lower than that of the unmodified wollastonite fillers, but higher than that of GCC filler in paper production. |
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