双助留体系下预絮聚加填对纸张性能的影响

Effect of Filling by Using Pre-flocculation Process with Dual-component System on the Paper Properties

关键词:  预絮聚  加填  双组分助留  纸张性能

Key Words:pre-flocculation  filling  dual-component retention  paper properties

摘要:采用阳离子聚丙烯酰胺（CPAM）、皂土双组分助留体系预絮聚烷基烯酮二聚体（AKD）和沉淀碳酸钙（PCC），探究各组分添加顺序对纸张施胶效果、填料留着率及纸张物理性能的影响。对比传统加填工艺发现，采用[PCC+CPAM+皂土+CS+AKD]的预絮聚加填工艺时，纸张的物理性能提高最为明显，纸张抗张指数提高22.4%，耐破指数提高52.0%，同时，纸张的匀度指数从111.9降低至69.0，匀度显著改善。将AKD提前加入浆料中，然后采用[PCC+CS+CPAM+皂土]的预絮聚加填工艺时，纸张的施胶度和填料留着率明显提高，相比传统纸张加填工艺，Cobb₆₀值降低了24.8%，填料留着率提高了3.7%。但所有预絮聚加填工艺由于增大了PCC的颗粒大小，使得纸张白度、不透明度、透气度都有所降低。

Abstract:AKD and PCC were pre-flocculated with dual-component retention system: CPAM and bentonite. The effects of addition sequence of each constituent on sizing, filler retention and physical properties of paper were investigated. Compared with the traditional filling process, it was found that when the pre-flocculation process of [PCC+CPAM+bentonite+CS+AKD] was used, the mechanical properties of paper were obviously improved, the tensile index and the burst index were increased by 22.4% and 52.0%, respectively. Meanwhile, the formation index was significantly decearsed from 111.9 to 69.0. When AKD was added to the pulp before filling by using pre-flocculation process of [PCC+CS+CPAM+bentonite], the sizing degree and the filler retention rate of the paper were significantly improved, the Cobb₆₀ value reduced by 24.8%,while the filler retention rate increased by 3.7% compared with the traditional filling process. However, all pre-flocculation processes could reduce whiteness, opacity and air permeability of the paper due to the increase of particle size of PCC.