Stability of carboxylated nanocellulose emulsified maleic rosin glyceride emulsions and preparation of superhydrophobic paper
Maleic rosin glyceride(MAP-DG)emulsion was prepared from solvent-assisted solubilisation,and the particle size distribution and stability of MAP-DG emulsion with emulsification agent of sodium dodecyl sulphate(SDS),alkylphenol polyoxyethylene ether(OP-10)and carboxylated nanofibrillated cellulose(CNF-C)were then compared.The preparation process strategy for superhydrophobic paper was constructed using a two-layer coating method,with mechanically pulped nanocellulose(CNF)and precipitated calcium carbonate(PCC)as the first coat and MAP-DG emulsion as the second coat.Under the optimal conditions of m(maleic rosin)∶m(glycerol)=1∶3,initiator(azobisisobutyronitrile)dosage 0.40％(based on the mass of maleic rosin,the same below),catalyst(nano-ZnO)2.0％(based on the mass of maleic rosin,the same below),reaction temperature 250 ℃ and reaction time 4 h,the MAP-DG emulsion prepared using CNF-C as emulsifier exhibited a particle size of 527 nm,and remained stable without emulsion breakage and delamination after storage at room temperature for 90 d.The PCC/CNF/MAP-DG coated paper prepared from double-layer coating,with a water contact angle of 159.1° and surface water absorption(Cobb value)of 2.4 g/m2,still retained its super-hydrophobicity after 200 folds,and was resistant to acid and alkali aqueous solutions,indicating good chemical stability.This super-hydrophobicity was attributed to the hold-up of water droplets by air trapped between the two-stage structure,forming a dense hydrophobic layer on the surface of paper fibers.
万方数据
维普
