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利用回收涤纶(PET)制得的一种水分散性聚酯化合物被广泛用作造纸的湿增强剂。这些聚酯树脂的结构包括3部分:PET骨架、功能性基团以及亲水性末端基。该文主要研究了聚酯化合物用量对纸的再制浆性能和再制浆能力的影响。研究表明,当聚酯用量最高达到200磅/t(纤维)时,利用PET处理的纸样依然可以再制浆;这些聚酯化合物可以与其他湿强树脂(如聚酰胺表氯醇树脂等)混合使用,它们不仅可以增加纸页的干强度和湿强度,还可以使一些原来利用增湿强树脂处理导致无法再制浆的纸可以再制浆。同时,研究了在不同的再制浆工艺条件下,聚酯类化合物改变纸页强度和再制浆性能的机理。通过加入回收的PET改变湿部化学品的组成,工厂可以在保证纸的性能的同时使其更加容易碎解。
A water-dispersible polyester compound made from recycled polyester (PET) is widely used as a paper wet-strength enhancer. The structure of these polyester resins includes 3 parts: a PET backbone, a functional group, and a hydrophilic terminal group. This paper mainly studies the influence of the amount of polyester compound on paper repulping performance and repulping capacity. Studies have shown that paper samples treated with PET can still be repulped when the amount of polyester is up to 200 lb / t (fibers); these polyester compounds can be mixed with other wet strength resins such as polyamide epichlorohydrin resins They not only increase the dry and wet strength of the paper, but also repulp some of the paper that was originally treated with moisturizing strong resin to cause non-repulpable paper. At the same time, the mechanism that polyester compounds changed the sheet strength and repulping performance under different repulping conditions was studied. By adding recycled PET to change the composition of the wet-end chemicals, the factory can make it more easily breakable while ensuring the paper’s properties.