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| Study on the Application of Low-molecular Weight HACC in Recycled Paper Production |
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| DOI：10.11980/j.issn.0254-508X.2014.11.004 |
| Key Words:HACC Zeta potential cationic demand residual ink retention |
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| Abstract:In this paper, the wet end chemical effects of low-molecular weight 2-hydroxypropyl trimethyl ammonium chloride chitosan (HACC) used as anionic trash collector in recycled paper making, in terms of fiber surface Zeta potential, cationic demand, the residual ink content, retention value and mechanical and optical properties of the handsheets were studied and the comparsion with traditional PA and PAC trash collectors was conducted. The aim of the research was to develop a new kind of ATC which could effectively alleviate the problems of paper machine runnability. The results showed that HACC was a more effective ATC than traditional PA and PAC with trapping more anionic trash. When the dosage of HACC was 0.1%, more than 70% of the anionic trash of deinked pulp was effectively removed while the surface Zeta potential of fibers was nearly unchanged. In addition, HACC had some favorable properties such as large amount of hydroxyl groups, and special amine structure, which would effectively enable residual ink and fines to be fixed onto the surfaces of pulp fiber, and reduce the wet end sediment. The 2# HACC with higher molecular weight was more suitable to be acted as ATC than the 1# HACC, compared with the traditional ATC, which was more effective to reduce the negative impacts on the physical properties of handsheets and paper machine runnability caused by anionic trash than traditional ones. |
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