AKD预絮聚工艺对纸张施胶效果的影响  

Effect of the Pre-flocculation of AKD on Paper Sizing Effeciency

作　　者：赵丽红 柯珣[2] 吴敏 王志伟[1] 钱丽颖[2] 任俊莉[2] ZHAO Lihong;KE Xun;WU Min;WANG Zhiwei;QIAN Liying;REN Junli(Guangxi Key Laboratory of Clean Pulp&Papermaking and Pollution Control,Guangxi University,Nanning 530004,China;State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]广西大学广西清洁化制浆造纸与污染控制重点实验室,广西南宁530004 [2]华南理工大学制浆造纸工程国家重点实验室,广东广州510640

出　　处：《林产化学与工业》2022年第5期69-75,共7页Chemistry and Industry of Forest Products

基　　金：广西清洁化制浆造纸与污染控制重点实验室开放基金资助项目(2021KF24)。

摘　　要：为了促使施胶剂烷基烯酮二聚体(AKD)在浆料系统中获得更高的留着率,提高与纤维发生反应的几率,采用造纸系统中常用的助留剂组分阳离子聚丙烯酰胺(CPAM)、阳离子淀粉(CS)以及膨润土(BN)对AKD进行预絮聚,以达到提高施胶效率的目标。通过改变3种助留剂的添加顺序,得到3种AKD预絮聚工艺(E、F、G),考察了不同预絮聚工艺对AKD絮聚体粒径、比表面积、体系浊度、Zeta电位,以及纸张施胶效果的影响。实验结果表明:预絮聚使AKD胶粒尺寸显著增大,工艺E、F、G所得AKD絮聚体的中值粒径分别为223.144、 310.461和263.026μm,体系浊度明显降低。3种AKD预絮聚工艺中,工艺浆料-E-PCC中先加膨润土和CS进行静电吸附,再进行CPAM的架桥作用,AKD絮聚体与纤维的结合作用更强,吸附10 min时,纤维对AKD的吸附量达到2.151 mg/g。工艺E所得AKD絮聚体与PCC共混施胶加填时,纸张可勃值(Cobb)降低到20.15 g/m~2,填料留着率达90.51%,40天施胶逆转率降低到5.49%。In order to obtain higher retention rate of alkyl ketene dimer(AKD) in the slurry system and improve the reaction between AKD and the cellulosic fibers, common of cationic polyacrylamides(CPAM), cationic starch(CS), and bentonite(BN), which are the common retention aids in papermaking systems were chosen to pre-flocculate AKD and thus improved its sizing efficiency. Three AKD pre-flocculation processes(E, F, G) were obtained by changing the addition sequence of the three retention aids. The effects of three pre-flocculate processes on AKD floc particle size, specific surface area, system turbidity, zeta potential, and paper sizing were investigated. The results showed that the pre-flocculation process significantly increased the size of the AKD colloidal particles. The median particle sizes of AKD flocs obtained from processes E, F, and G were 223.144, 310.461 and 263.026 μm, respectively, and the turbidity of the pulp suspension was effectively reduced. Among the three pre-flocculation processes, the pulp-E-PCC, in which the negatively charged bentonite and positively charged CS were attracted with AKD by electrostatic force, followed by the bridging effect from CPAM, generated AKD floc with a stronger binding to fibers. The adsorption of AKD by the fiber reached 2.151 mg/g at 10 min of adsorption. When AKD flocs from process E were blended with PCC for sizing and filling, the Cobbvalue of the paper sheets reduced to 20.15 g/m~2, filler retention reached 90.51%, and the sizing reversal rate in 40 days decreased to 5.49%.

关 键 词：施胶 预絮聚 AKD 粒径 

分 类 号：TQ35[化学工程] TS7[轻工技术与工程—制浆造纸工程]