Study On Dispersion And Application For Papermaking Of Bacterial Cellulose

The bacterial cellulose is a kind of high purity natural organicpolymers, which has the same chemical molecular chain structure as theplant cellulose. It is the finest fiber in the world’s currently known, andhas the special nature of nanomaterial, such as large specific surfacearea, surface charge and adsorption properties, and so on. The bacterialcellulose is biodegradable, with single chemical structure, high Young’smodulus and water holding capacity. It is a new green environmentalmaterials, and therefore it can be used as paper additives in thepapermaking process.In this paper, the morphology, staining method, dispersion methods,electrochemical properties and paper strength of plant cellulose withbacterial cellulose were studied, and the mechanism of the strength.This occurrence and forming of paper were investigated.The results show that it don’t contain hemicelluloses, lignin andother substances in the bacterial cellulose. It cannot be dyeing byHerzberg’s stain. But it can be dyeing by the reactive dye. The effect isobvious. The reactive dyes directly generated the covalently bond withthe group of the cellulose molecules. It has the advantages of the brightcolors, high evenness and fastness, and difficult to fade. It can be seenwith the naked eye to see the fibril-like stained bacterial cellulose in thepaper with plant fiber.The effect of bacterial cellulose were not well dispersed with acidtreatment, alkali treatment and ultrasonic dispersing. The dispersingmechanical is effective, the standard fiber disperser is enough. After ahigh-speed string, the bacterial cellulose wet film can become aflocculent suspension. When the bacterial cellulose was treated by“friction deformation effects” with PFI mill beating, it showed a pastestate. By which the bacterial cellulose are dispersed finer, and the more suitable for modifying paper strength properties of plant fibers.The bacterial cellulose surface has an order of magnitude hydroxylhigher than the plant fiber. The hydrogen bonds on the bacterialcellulose surface are much more than the plant fiber. So theelectrochemical properties of bacterial cellulose are most different fromthe plant cellulose. The bacterial cellulose suspension has the lowerζ-potential, the higher cationic demand, and the higher conductancethan the plant cellulose suspension under the same concentration. PHchanges is not related so much to fiber type. It is about7. The bacterialcellulose is litmusless in water.The enhancing is obvious when bacterial cellulose were added intothe paper. When the additive amount of bacterial cellulose is3%, thestrength index of the tensile index, tear index, burst index and foldingincreased by40.73%,40.91%,38.31%respectively than that of theblank samples, folding endurance increased by23.21%. The strengthindex of paper increased significantly when the bacterial cellulose weretreated with PFI mill, tensile index increased by77.57%, tear indexincreased by20.41%, burst index increased by38.23%, foldingendurance increased by25.32%. The better dispersing caused by PFImill is contributed to the strength properties.Although staining methods shows qualitatively the distribution ofbacterial cellulose in the sheet. There still have no method to measurethe such research has blind spot that is retention in the measure of thebacterial cellulose retention of paper sheet.