The effect of polyelectrolyte on drainage and soda-AQ pulp strength of rice straw

In this study، rice straw as an abundant and cheap raw material selected to produce soda - anthraquinone pulp. Nano fiber Cellulose of rice straw were added to improve the pulp strength after cationing. Cationed suspension was mixed at three levels including 2، 5 and 10 percent with nano fiber cellulose. Starch and polyacrylamide as cationic chemicals were used to stabilize nano fiber cellulose at 1. 5% and 0. 2% based on oven dried pulp، respectively. The result showed that there is linear change between stock drainage time and paper strength according to nano fiber cellulose added content. Tensile and burst index were improved at 18. 66% and 18. 12% respectively by adding 10% of nano fiber cellulose to suspension treated with cationic polyacrylamide. Furthermore، the two indices increased until 19. 35% and 19. 24% by adding of maximum amount of nano fiber cellulose (10%) to cationed pulp suspension with cationic starch، respectively. The use of nano fiber cellulose had a positive significant effect on paper properties.