تاثير ماده تثبيت كننده كاتيوني بر پايه پلي دادمك بر ويژگي هاي مقاومتي خميركاغذ OCC

Effect of cationic polyDADMAC-based fixing agent on strength properties of OCC pulp

ﻣﻮاد ﭼﺴﺒﻨﺎك ﺑﻪ ﻋﻨﻮان ﯾﮑﯽ از ﭼﺎﻟﺶﻫﺎي اﺳﺎﺳﯽ در ﺻﻨﻌﺖ ﮐﺎﻏﺬﺳﺎزي و ﺑﻪ وﯾﮋه ﻓﺮآﯾﻨﺪ ﺑﺎزﯾﺎﻓﺖ ﮐﺎرﺗﻦﻫﺎي ﮐﻨﮕﺮهاي ﮐﻬﻨﻪ )OCC( ﻣﻄﺮح ﻫﺴﺘﻨﺪ. اﺳﺘﻔﺎده از ﭘﻠﯿﻤﺮﻫﺎي ﮐﺎﺗﯿﻮﻧﯽ ﺗﺜﺒﯿﺖ ﮐﻨﻨﺪه ﯾﮑﯽ از ﻣﻬﻤﺘﺮﯾﻦ روﯾﮑﺮدﻫﺎي ﻣﺘﺪاول ﮐﻨﺘﺮل اﯾﻦ ﻣﻮاد ﻣﻀﺮ ﻣﺤﺴﻮب ﻣﯽﺷﻮد. ﺑﺎ اﯾﻦ وﺟﻮد، ﺑﺪﯾﻬﯽ اﺳﺖ ﮐﻪ ﻋﻼوه ﺑﺮ ﻣﺎﻫﯿﺖ ﺗﺜﺒﯿﺖﮐﻨﻨﺪﮔﯽ، ﺑﺮ وﯾﮋﮔﯽ ﻣﺤﺼﻮل ﻧﻬﺎﯾﯽ ﻧﯿﺰ ﺗﺎﺛﯿﺮﮔﺬار ﺑﺎﺷﻨﺪ. در اﯾﻦ ﭘﮋوﻫﺶ، ﺗﺎﺛﯿﺮ اﺳﺘﻔﺎده از ﭘﻠﯿﻤﺮ ﮐﺎﺗﯿﻮﻧﯽ ﺻﻨﻌﺘﯽ GL ﺑﻪ ﻋﻨﻮان ﻋﺎﻣﻞ ﮐﻨﺘﺮلﮐﻨﻨﺪه ﻣﻮاد ﭼﺴﺒﻨﺎك در ﺧﻤﯿﺮﮐﺎﻏﺬ OCC در ﺳﻪ ﺳﻄﺢ 0/8 ،0/4 و 1/2 درﺻﺪ و در دو ﻣﺤﺪوده pH 4 و 7 ﺑﺮ وﯾﮋﮔﯽﻫﺎي ﻣﻘﺎوﻣﺘﯽ ﮐﺎﻏﺬﻫﺎي دﺳﺖﺳﺎز ﺑﺮرﺳﯽ ﺷﺪ. ﺷﻨﺎﺳﺎﯾﯽ GL ﺗﻮﺳﻂ ﻃﯿﻒﺳﻨﺠﯽ FT-IR ﺛﺎﺑﺖ ﮐﺮد ﮐﻪ اﯾﻦ ﻣﺎده ﺑﺮ ﭘﺎﯾﻪ ﭘﻠﯽدادﻣﮏ ﺳﻨﺘﺰ ﻣﯽﺷﻮد. ﻧﺘﺎﯾﺞ ﻧﺸﺎن داد ﮐﻪ اﺳﺘﻔﺎده از اﯾﻦ ﭘﻠﯿﻤﺮﮐﺎﺗﯿﻮﻧﯽ در ﺷﺮاﯾﻂ ﻋﻤﻠﯿﺎﺗﯽ ﻣﻨﺎﺳﺐ اﺣﺘﻤﺎﻻً ﺑﺎ ﻣﺘﺎﺛﺮ ﺳﺎﺧﺘﻦ ﺷﮑﻞﮔﯿﺮي و ﭘﯿﻮﻧﺪﯾﺎﺑﯽ ﺑﯿﻦ اﻟﯿﺎف ﺑﺎ ﺧﻨﺜﯽﺳﺎزي و ﺳﭙﺲ ﺗﺜﺒﯿﺖ و دﻟﻤﻪ ﮐﺮدن ﻣﻮاد ﭼﺴﺒﻨﺎك و ﻧﺮﻣﻪﻫﺎ ﺑﻪ اﻟﯿﺎف ﺳﺒﺐ ﺑﻬﺒﻮد وﯾﮋﮔﯽﻫﺎي ﻣﻘﺎوﻣﺘﯽ ﮐﺎﻏﺬ دﺳﺖﺳﺎز ﺷﺪه اﺳﺖ. اﯾﻦ اﻓﺰاﯾﺶ در 4=pH و7=pH ﺑﻪ ﺗﺮﺗﯿﺐ ﺑﺮاي ﻣﻘﺎوﻣﺖ ﺑﻪ ﮐﺸﺶ 35 و 30 درﺻﺪ، ﻣﻘﺎوﻣﺖ ﺑﻪ ﺗﺮﮐﯿﺪن ﮐﺎﻏﺬ 12 و 10 درﺻﺪ، ﻣﻘﺎوﻣﺖ ﺑﻪ ﻓﺸﺎر ﻟﻬﯿﺪﮔﯽ ﻟﺒﻪ در ﺣﺎﻟﺖ ﺣﻠﻘﻪ )RCT( 29 و 21 درﺻﺪ، ﻣﻘﺎوﻣﺖ ﺑﻪ ﻓﺸﺎر ﻻﯾﻪ ﻣﯿﺎﻧﯽ )CMT( 19 و 32 درﺻﺪ و ﻣﻘﺎوﻣﺖ ﺑﻪ ﭘﺎره ﺷﺪن ﮐﺎﻏﺬ 10 و 13 درﺻﺪ اﻧﺪازهﮔﯿﺮي ﺷﺪ. ﺑﻪ ﻋﻨﻮان ﯾﮏ ﻧﺘﯿﺠﻪ-ﮔﯿﺮي ﮐﻠﯽ، اﺳﺘﻔﺎده از 0/4 درﺻﺪ ﭘﻠﯿﻤﺮﮐﺎﺗﯿﻮﻧﯽ در 7=pH ﺑﻪ ﻋﻨﻮان ﻣﻘﺪار ﺑﻬﯿﻨﻪ ﺗﺜﺒﯿﺖﮐﻨﻨﺪه ﮐﺎﺗﯿﻮﻧﯽGL ﺑﺮاي ﮐﺎرﺑﺮدﻫﺎي ﺻﻨﻌﺘﯽ ﭘﯿﺸﻨﻬﺎد ﻣﯽﺷﻮد.

Stickies are one of the main challenges in the papermaking industry, especially in recycling process of old corrugated containers (OCC). Application of a fixing cationic polymer is one of the main approaches to control these harmful substances. However, it is obvious that these agents besides fixing characters could also influence the final product properties. Therefore, in this study, the effect of using an industrial cationic polymer i.e. GL, as a stickies control agent on mechanical properties of hand-sheets made of OCC fibers, was assessed at three levels of 0.4, 0.8 and 1.2% (based on pulp dry weight) and at two pH ranges of 4 and 7. The characterization of the GL by FT-IR spectroscopy demonstrated that it was synthesized based on poly (diallyldimethylammoniumchloride). The results showed that use of the cationic polymer enhanced the strength properties of the hand-sheets by influencing formation and inter- fiber bonding through fixing and flocculating the stickies and fines into the fibers network. These respective enhancements were measured at pH ranges of 4 and 7 as follows: Tensile strength of 35 and 30%, burst strength of 12 and 10%, ring crush test (RCT) of 29 and 21%, Concora medium test (CMT) of 19 and 32% and tear strength of 10 and 13%. It can be concluded that 0.4 % GL cationic fixing agent could be proposed as optimum value at pH =7 for industrial applications