学术
摘 要:
对漂白桉木KP浆的细小纤维及长纤维打浆后产生的细小纤维在不同pH值条件下的电荷需求量、叩解度和保水值变化情况进行了研究，结果如下：pH值影响细小纤维的表面电荷密度，并对细小纤维的叩解度和保水值有非常大的影响。pH值从4升高到10，原生细小纤维（P200）、打浆产生的细小纤维（P’200）的阳离子需求量分别由0．033和0．050meq／g增大到0．060和0．110meq／g；P200和P’200的阴离子需求量最大值分别为0．014和0．01meq／g；pH值在4～10范围P200和P’200呈“净负电荷性”，在中性奈件下，P200和P’200的胶体滴定比率（CTR值）最大值分别约为0．4和0．2。pH值对叩解度的影响P200大于P’200，pH值对保水值的影响P200小于P’200，P’200有较大的初始叩解度和较高的初始保水值。[著者文摘]
文章出处:
《生物质化学工程》-2006年40卷5期 -7-10页
栏目信息:
分 类 号:
文献标识码:
A
文章编号:
1673-5854（2006）05-0007-04
Study on Surface Chemistry Characteristics of Fines （Ⅰ） ——The Effects of pH Value in Wet-end System on Characteristics of Fines
LIU Li-sha, DAI Hong-qi, WANG Shu-mei, YE Chun-hong （ College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China）
Abstract:
In this paper, the charge demand, beating degree, and water retention value （WRV） of fines including original （P200） and fiber fragment （P＇200） which comes from KP bleached eucalyptus pulp are studied when they are affected by pH value. The results show that pH value affected the surface charge of fines, and had greatly effect to the beating degree and the WRV. When pH value raises from 4 to 10, the cationic demands of both P200 and P＇200 increase respectively from 0. 033 and 0.050 meq/g to 0.060 and 0. 110 meq/g; the maximum anion demands of P200 and P＇200 are respectively 0. 014 and 0. 010 meq/g. In the range of pH value 4- - 10, P200 and P＇200 represent negative charge state. At pH neutral condition, the maximum CTR values of P200 and P＇200 are respectively 0. 4 and 0.2. The effect of pH value on beating degree of P200 is higher than that of P＇200, and the effect of pH value on WRV of P200 is less, than that of P＇200, P＇200 has greater beginning beating degree and WRV.[著者文摘]
Key words:
fines ; pH value ; surface chemistry characteristics
基金资助:
国家自然基金项目（30571467）中的部分内容
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