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Powder Technology

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Dual-surface modification of calcium sulfate whisker with sodium hexametaphosphate/silica and use as new water-resistant reinforcing fillers in papermaking

Published:1 February 2015 DOI: 10.1016/j.powtec.2014.11.015
Xin Feng , Ying Zhang , Gangling Wang , Miao Miao , Liyi Shi

Abstract

Inorganic calcium sulfate whisker (CSW) was surface modified with sodium hexametaphosphate (SHP) as waterproof modifier to reduce the solubility, and subsequently CSW/SHP was further modified using the coating of silica to improve water tolerant and enhance the bondability between CSW and wood fibers. Through the dual-surface modification, electrical conductivity (EC) of the pure unmodified CSW decreased dramatically and reached an equilibrium value of 73.9?μs·cm???1 in the CSW/SHP/SiO2 solution. The mechanical properties of hybrid handsheets containing 2.5–20?wt.% modified fillers were investigated, and the retention of the modified fillers was higher than that of unmodified fillers.

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Related products
Procduct Name CAS Molecular Formula Supplier Price
Quartz 14808-60-7 O2Si 779 suppliers $10.00-$6975.05
sodium hexametaphosphate 10124-56-8 H7NaO18P6 758 suppliers $6.00-$218.00
SILICA 14464-46-1 O2Si 265 suppliers $112.00-$1780.00
Calcium sulfate hemihydrate 10034-76-1 CaH2O5S 158 suppliers $14.00-$4272.40

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