The Preparation And Properties Of Paper Based On The Biodegradable Fibers

As the improvement of people's sense of environment protection, the research ofbiodegradable material has been an important subject. If use a certain percentage ofbiodegradable fibers when making paper, and make sure paper's other performance is good,the paper can not onlymeet the dailyuse requirements, but also degrade naturally, makingnoenvironment pollution. This paper is to provide guidance for the application of these twobiodegradablefibersinthepaper-makingindustry.The beating and papermaking behaviors of PLA fiber and alginate fiber were studied,and the influence of the ratio of PLA fiber and alginate fiber and press polish and hottreatment to the paper properties were researched. The retention of PLA fiber and alginatefiber in the paper was studied by means of TG and extraction. The degradation of the paperwas studied by putting the paper in the soil and Accelerated Weathering Tester for a certaintime.Theresultsindicatedthat:1.Thebeatingdegreeandthecrystallinity didn'tchangeobviouslyasbeatingtimeincreased.Thedegreewas11°SRafter12hours.Afterbeating,thefiberbecameshorter,wider,curvedandcoarse,buthadnoobviousfibrillation.AndbeatingcouldimprovethehydrophilicityofPLAfiber.Atthesametime,thebiggerPLAfiberpercentage,thebetterpulpdrainability.2. The appropriate technology of PLApaper was as follows: the ratio of PLA pulp andwood pulp was 15:85,the press polish pressure was 4MPa, the hot treatment temperature was170℃and time was 2min. The paper's basis weight was 60g·m-2, the densitywas 0.88g·cm-3,the tensile index was 63.1N·m·g-1, the tear index was5.94mN·m2·g-1, the foldingstrength was62, the wet tensile index was 0.531kN·m-1, the porosity was 110mL·min-1, the opacity was67.4%,theCobbvalue(60s)was 31.1g·m-2,thePPSvaluewas3.84μm.ThePLAfiberstartedto lose weight at 240℃, and the weight loss was 98.67%. The PLA fiber started to melt at154℃.3.Theretentionof PLA fiberinthepapercouldnot bemeasuredbythemeanofTG, butcouldbemeasuredbythe meanofextraction,theretentionwashigherthan99%.4. The alginate fiber was smooth, straight and long. Its hydrophilicity was good. Thewater retention value was 35.49% and the crystallinity was 9.67%. The bigger alginate fiberpercentage,thebetterpulpdrainability.ThePLAfiberstartedtoloseweightat210℃,andtheweight loss was 70.71%. The appropriate press polish pressure was 6MPa. The paper properties didn't change too much after the hot treatment. And retention of alginate fiber inthepapercouldnotbemeasuredbythe meanofTG.5. After putted in the soil for 60 days, the papers were damaged and mildewed, andbecame yellow. As the UV aging time increased, the tensile index, the tear index and thefoldingstrengthofthepaperweredecreased,buttheporosityandopacitywereincreased.