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Preparation and application of cellulose-based colorants with high color strength

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Abstract

In this work, colored regenerated cellulose (CRC) suspensions that are suitable for writing inks and can color polymers were prepared from wood pulp cellulose. Wood pulp cellulose was dissolved in aqueous phosphoric acid (PA) and regenerated in water in a controllable manner. It was shown that the degree of polymerization, crystallinity, as well as micromorphology of the regenerated cellulose (RC) could be tuned by adjusting the PA-based dissolution/regeneration conditions to achieve optimum dye accessibility. When reacting the obtained RC with commercially available reactive dyes, an unprecedentedly high color build-up of up to 402 mg/g was achieved. The resulting CRC exhibits pseudoplastic rheological properties and can be used for formulating additive-free and water-resistant gel-ink. The emulsifying capability of CRC enabled a master batch of colored polylactic acid (PLA) to be created via a Pickering emulsion template method. The colored masterbatch could be directly melt-spun into colored PLA fibers. The CRC prepared herein shows great potential as a versatile and environmentally friendly polymeric colorant.

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Funding

This work was funded by the Fundamental Research Funds for the Central Universities (No. 2232022G-04) and the International Cooperation Fund of Science and Technology Commission of Shanghai Municipality (Grant No. 21130750100).

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Wenjiao Zhang, Hui Su, Zhengzheng Hao, Zhiping Mao, Xueling Feng, Xiaofeng Sui and Bijia Wang. The first draft of the manuscript was written by Wenjiao Zhang and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Bijia Wang.

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Zhang, W., Su, H., Hao, Z. et al. Preparation and application of cellulose-based colorants with high color strength. Cellulose 30, 9161–9174 (2023). https://doi.org/10.1007/s10570-023-05382-7

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  • DOI: https://doi.org/10.1007/s10570-023-05382-7

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