CPAM用量对填料絮聚体稳定性和成纸性能的影响

Properties of PCC Flocs Preflocculation with CPAM and Its Application as Filler in Papermaking

关键词:  絮聚体  CPAM  留着  抗张强度

Key Words:flocs  CPAM  retention  tensile strength

摘要:填料经预絮聚后以絮聚体的形式加填纸张中，絮聚体在湿部的尺寸及稳定性对纸张性能有着重要影响。采用不同用量的阳离子聚丙烯酰胺（CPAM）对沉淀碳酸钙（PCC）进行预絮聚，通过絮聚体粒径的变化，研究了不同剪切条件下PCC絮聚体抗剪切与再絮聚效果，并考查了所得絮聚体对成纸性能的影响。结果表明，随着CPAM用量从1%增加至7%，絮聚体粒径由23.37 μm增大至31.92 μm。与常规PCC加填方法相比，当CPAM用量为3%~7%且加填量55%时，预絮聚加填纸张留着率均可提高约3个百分点左右。当CPAM用量为3%，填料含量为30%时，预絮聚加填比常规加填纸张抗张指数提升了约16%，而CPAM用量高于3%时所得的大粒径絮聚体对成纸抗张指数反而不利，且纸张白度有所降低。

Abstract:PCC filler in the form of flocs by preflocculation applied in papermaking was studied， the size and stability of the floc in wet end had important influence on the properties of paper. Precipitated Calcium Carbonate(PCC)was preflocculated with different amounts of cationic polyacrylamide（CPAM）， shearing resistance and preflocculation capacity of PCC flocs under different shearing conditions were investigated， influence of various flocs from different preflocculation conditions on paper properties was also studied.The results showed that the particle size of flocs was larger and its stability was better when high dosage of CPAM was used.Compared with the conventional filler loading， filler retention rate in high filler content paper increased about 3% when CPAM dosage was 3%~7% and filler content was 55%, tensile index increased about 16% when CPAM dosage was 3%. However， under high CPAM dosage， the addition of larger flocs were unfavorable to the tensile index of paper， and whiteness of paper．