Nanoparticle Gels Obtained from Hardwood and Softwood Bark for Reinforcing of Paper

Abstract

For reinforcing of paper, nanoparticle gels from black alder, birch and pine bark were obtained. Non-extracted bark and that extracted in biorefinery were used. For producing nanoparticles, the materials were destructed using the thermocatalytic destruction method and then dispersed in water medium in a ball mill. At a sufficient concentration, gel-like dispersions were obtained, which contained nanoparticles with the size ~300 nm. The effect of nanoparticle gels on the properties of paper sheets was investigated by introducing the dissolved gels in paper furnish and by covering both sides of paper sheets with nanoparticle gel coatings. It has been established that the nanoparticle fillers increase the tensile and burst strength. The nanoparticle fillers from extracted bark increase the mechanical indices to a higher extent. The coatings from nanoparticle gels considerably improve the Gurley air resistance of paper and increase the mechanical indices of paper sheets, especially burst strength. The effect of nanoparticle gel coatings is dependent on the coating thickness and gel concentration. The coatings decrease the tensile strength in a wet state.

Bio-Based Poly(butylene succinate)/Microcrystalline Cellulose/Nanofibrillated Cellulose-Based Sustainable Polymer Composites: Thermo-Mechanical and Biodegradation Studies

“…Nanofibrillated cellulose gel-like dispersion was prepared using mechanical treatment with a high shear force following the previously established method [ 51 ]. NFC fabrication is similar to MCC preparation but involves addition of water after the drying process and wet milling of the cellulose for 15 h. The size of NFC particles was around 300 nm, as evidenced by dynamic light scattering measurements ( Figure 1 b).…”

Use of Fine Fibre Cellulose for Reinforcing Paper

“…These results are similar to those obtained earlier with regard to a nanoparticle filler developed from bark. 10 In the latter case, the nanoparticle filler obtained from extracted black alder and pine bark, increased the tensile index in a dry state 1.40 and 1.30 times, the burst index 1.25 and 1.14 times, and the tensile index in a wet state 1.73 and 1.67 times, respectively, when used in the content of 20%.…”

“…Our earlier works have shown that fillers and coatings obtained from nanoparticle gels produced from wood processing wastes considerably improve paper properties. [7][8][9][10] In this work, nanocellulose gels from fine fibre cellulose were obtained for their use in papermaking.…”