Study on the Multilayer Barrier Coating Using Cellulose Nanofibrils and Internal Sizing Agent

Su Ho Kim; Ji Young Lee; Hae Min Jo; Yeon Hui Lee

doi:10.7584/JKTAPPI.2020.12.52.6.47

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2020 Vol.52, Issue 6 Preview Page Next Page

Study on the Multilayer Barrier Coating Using Cellulose Nanofibrils and Internal Sizing Agent 셀룰로오스 나노피브릴과 내첨사이즈제를 이용한 다층 배리어 코팅 기술에 대한 연구

30 December 2020. pp. 47-55

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Abstract

In this study, we tried to develop techniques to increase coat weight and improve water resistance at a lower number of multilayer barrier coatings with anionic and cationic cellulose nanofibrils (CNFs), which has been reported in previous research. The concentration of CNF slurry was adjusted to increase the coat weight, while alkyl ketene dimer (AKD) was added as an internal sizing agent to the anionic CNF slurry to impart hydrophobicity to the CNFs. After the preparation of CNF slurries, the multilayer barrier coating was applied on never-size base paper. The coat weight, air permeability, and Cobb size degree of the barrier-coated paper were subsequently measured, and the surface of the paper was analyzed via SEM.

The coat weight and air permeability of the paper coated four times with CNF slurry at 1.4% concentration were similar to those of the paper coated six times with CNF slurry at 1.0% concentration. In addition, the Cobb size degree of the barrier-coated paper decreased as the AKD addition to anionic CNF at a concentration of 1.4% increased linearly. However, when the addition level of AKD increased more than 5.0%, the Cobb size degree of the barrier-coated paper increased due to the uneven distribution of AKD. Therefore, multilayer barrier coating can be carried out effectively with cationic and anionic CNFs at high concentrations, and AKD improves the water resistance of barrier-coated paper.

Keywords

Cellulose nanofibril (CNF)

cationic CNF

multilayer barrier-coating

alkyl ketene dimer (AKD)

air permeability

cobb size degree

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Information

Publisher :Korea Technical Association of The Pulp and Paper Industry
Publisher(Ko) :한국펄프종이공학회
Journal Title :Journal of Korea TAPPI
Journal Title(Ko) :펄프종이기술
Volume : 52
No :6
Pages :47-55
Received Date : 2020-11-19
Revised Date : 2020-12-04
Accepted Date : 2020-12-07
DOI :https://doi.org/10.7584/JKTAPPI.2020.12.52.6.47

Journal of Korea TAPPI ISSN:0253-3200(Print) 펄프종이기술

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Literature Cited