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Preparation of cross-linking PVA copolymer modified by DAAM/ADH and application in paper surface sizing

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Abstract

Herein, a novel modified polyvinyl alcohol(DA-IPVA) used as sizing agent was prepared by using diacetone acrylamide(DAAM)/adipic dihydrazide(ADH) as graft monomer and N-(isobutoxymethyl)acrylamide(IBMA) as self-cross-linking monomer. The effect of the amount of DAAM on the properties of emulsion, film and sizing paper was discussed. The surface micro-structure of the sizing paper was characterized by SEM and AFM. The addition of DAAM/ADH and IBMA endowed DA-IPVA with cross-linked active group and increased cross-linking density and hydrophobicity after ADH was added into the emulsion and the cross-linking structure was formed. The enhancing mechanism of surface sizing agent for paper was revealed. The DA-IPVA can be cross-linked on the surface and inside of the paper to form a dense network structure, which improves the bonding force between the fibers. When the mole fraction of DAAM of the cross-linking monomer is 8%, the surface sizing performance of the paper is obviously improved compared with the base paper. The dry and wet strength is increased by 266.5% and 334.3% respectively, and the folding resistance is increased 2946.67%. This study can have a profound impact on the development of the technology of cross-linking surface sizing agent for paper.

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Acknowledgements

The research are supported by National Natural Science Foundation of China (Grant No. 20876093), Key Laboratory Project of Science and Technology Co-ordination and Innovation Engineering of Shaanxi Province (Grant No. 2013SZS10-Z01, China), Shangluo Science and Technology Projects (2021-Z-0055), Key Scientific Research Projects of Shaanxi Provincial Department of Education (21JS025), Natural Science Project of Shangluo University (21SKY001) and Innovation and Entrepreneurship Training Program for College Students in Shaanxi Province (S202111396057). The authors express sincere thanks to above funding.

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Correspondence to Kaibin Li or Xiaorui Li.

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Li, K., Li, X., Wang, D. et al. Preparation of cross-linking PVA copolymer modified by DAAM/ADH and application in paper surface sizing. Cellulose 29, 6845–6863 (2022). https://doi.org/10.1007/s10570-022-04680-w

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  • DOI: https://doi.org/10.1007/s10570-022-04680-w

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