The Research Of Adding Bacterial Cellulose To Improve The Strength Of Long-fiber Paper

Bacterial cellulose(bacterial cellulose,BC)is generated by bacterial,its chemical composition is consistent with the plant fibers,bacterial cellulose are connected together by a D-glucose through the ?-1,4-glycosidic bonds,although the chemical composition is similar,but its performance and properties are very different from plant fibers.BC as a potential new biological materials has many superior characteristics and unique structural features,such as: high hydrogen bonding capability,high elastic modulus,high crystallinity,high permeability and water absorption good biocompatibility,etc.,so the research and application of bacterial cellulose has attracted widespread concern in the scientific community.BC currently has a wide range of applications in medicine,textile,paper and biochemistry,in particular,it has great potential development in terms of biomedical and specialty paper.Use the mechanical methods for dispersing bacterial cellulose,under certain the concentration of the dispersion,then do the research of the bacterial cellulose structural features and related properties of different number dispersion,and to determine the better dispersion conditions.Then the bacterial cellulose of different amounts were added to different freeness add softwood fiber and long-fiber pulp mixed with a copy to the paper,the paper is detected by the pHysical strength,the strength of the paper we analyze the mechanism of change,it is judged most bacterial cellulose good addition.The results show that bacterial cellulose after mechanical ease can be dispersed into a homogeneous fiber suspension,under the electron microscope found that bacterial cellulose has a nanoscale network structure,and have fine fibers;bacterial cellulose wet film has a strong water holding capacity,water holding rate can reach to 98.28%;the eased bacterial cellulose has a higher degree of polymerization,the degree of polymerization reach to 5,000.The dispersion bacterial cellulose is added to the different long fibers to make paper,the paper pHysical strength has increased of varying degrees,for 40 ° SR softwood pulp fibers,adding 3% bacterial cellulose,the paper tensile index is 83.9N m / g,compared with the original softwood fiber paper tensile strength increased by 13.2%,the largest tear index is 12.1 mN m~2 / g increased by 12.1%,the largest burst index of 6.35 kPa m~2 / g increase by 8.3%;for mixed long fibers,adding 6% bacterial cellulose,the highest tensile index 17.03 N m / g,compared with the paper strength increased by 31.3%.Paper tearing and burst index reaches the maximum value,respectively: 18.61 mN m~2 / g and 11.78 kPa m~2 / g,compared with the original paper were increased by 67.0% and 49.3%.Derived from the environmental scanning electron microscopy and infrared spectroscopy,the bacterial cellulose nanofiber network structure having a relatively large surface area,The surface free hydroxyl of BC and softwood fibers to form new hydrogen bonds,thereby enhancing pHysical indicators of the paper,to achieve the purpose of enhancement.