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在造纸过程中,许多胶状颗粒被添加到纸浆纤维悬浮液中以改善纸张的性能。在适当的条件下,这些不同的胶体可能会相互作用并发生絮凝,如用于改善纸张不透明度和疏水性的填料和浆内施胶剂就是很好的例子。浆内施胶剂通常以固化的乳液形式存在,并通过阳离子淀粉和其他稳定剂保持其稳定性。研究了常见浆内施胶剂烷基烯酮二聚物(AKD)与沉淀碳酸钙(PCC)颗粒的相互作用。实验发现,PCC和AKD并未发生原先预料的共絮聚。而是观察到AKD和PCC的均一絮聚。可以这样解释上述现象:淀粉从AKD迁移到PCC,从而导致PCC因淀粉发生絮聚,同时AKD因稳定剂的失效而丧失稳定性。
In the papermaking process, many colloidal particles are added to the pulp fiber suspension to improve paper properties. Under the right conditions, these different colloids may interact and flocculate, as are good examples of fillers and in-sizing agents used to improve paper opacity and hydrophobicity. Slurry sizing agents are typically in the form of a cured emulsion and retain their stability with cationic starches and other stabilizers. The interaction of the common sizing agent alkyl ketene dimer (AKD) with precipitated calcium carbonate (PCC) particles was investigated. The experiment found that PCC and AKD did not occur co-flocculation originally expected. Instead, uniform flocculation of AKD and PCC was observed. This can be explained by the phenomenon that starch migrates from AKD to PCC, causing PCC to flocculate starch, while AKD loses its stability due to the failure of the stabilizer.