Hydroxypropyl Sulfonated Lignin as Dye Dispersant: Effect of Average Molecular Weight

Qin, Yanlin; Yang, Dongjie; Qiu, Xueqing

doi:10.1021/acssuschemeng.5b00821

Cited by 75 publications

(51 citation statements)

References 26 publications

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“…[84] Epichlorohydrin was added subsequently andt he reaction was carriedo ut for 1h to cross-link the sulfonated lignin to different extents. Consequently,h ydroxypropyl sulfonation of lignin has been proposed.…”

Section: Hydroxypropyl Sulfonationmentioning

confidence: 99%

“…[84] The sulfonated product contained as imilar sulfonate content of 2.1 mmol g À1 on lignosulfonates. [84] The sulfonated product contained as imilar sulfonate content of 2.1 mmol g À1 on lignosulfonates.…”

Section: Hydroxypropyl Sulfonationmentioning

confidence: 99%

“…[93] This also increased the fluidity of the cementp aste to 200 mm. [84] It was claimedt hat the hydrophobicity of lignosulfonates played an important role in their dispersing performance. [93] Increased viscosity is indicative of increased molecular weight.…”

Section: Dispersant and Concrete Additivesmentioning

confidence: 99%

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Production and Application of Lignosulfonates and Sulfonated Lignin

2017

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Lignin is the largest reservoir of aromatic compounds on earth and has great potential to be used in many industrial applications. Alternative methods to produce lignosulfonates from spent sulfite pulping liquors and kraft lignin from black liquor of kraft pulping process are critically reviewed herein. Furthermore, options to increase the sulfonate contents of lignin-based products are outlined and the industrial attractiveness of them is evaluated. This evaluation includes sulfonation and sulfomethylation of lignin. To increase the sulfomethylation efficiency of lignin, various scenarios, including hydrolysis, oxidation, and hydroxymethylation, were compared. The application of sulfonated lignin-based products is assessed and the impact of the properties of these products on the characteristics of their end-use application is critically evaluated. Sulfonated lignin-based products have been used as dispersants in cement admixtures and dye solutions more than other applications, and their molecular weight and degree of sulfonation were crucial in determining their efficiency. The use of lignin-based sulfonated products in composites may result in an increase in the hydrophilicity of some composites, but the sulfonated products may need to be desulfonated with an alkali and/or oxygen prior to their use in composites. To be used as a flocculant, sulfonated lignin-based products may need to be cross-linked to increase their molecular weight. The challenges associated with the use of lignin-based products in these applications are comprehensively discussed herein.

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Section: Hydroxypropyl Sulfonationmentioning

confidence: 99%

Section: Hydroxypropyl Sulfonationmentioning

confidence: 99%

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Production and Application of Lignosulfonates and Sulfonated Lignin

2017

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“…[8,9] Also, alkali lignin obtained from pulping waste liquor is a nontoxic and renewable polymer that can be modified and used as a dispersant in the textile industry. [10] Specifically, it was estimated that more than 50 million tons of alkali lignin has been produced annually in the paper industry in China, while recycled alkali lignin accounts for only about 6 percent. [11] The majority of alkali lignin produced is used as fuel and only few parts are used for higher value-added applications.…”

Section: Introductionmentioning

confidence: 99%

Quaternized lignin-based dye dispersant: Characterization and performance research

Luo

et al. 2016

Journal of Dispersion Science and Technology

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Lignin-based dye dispersants have aroused an increasing interest due to their environment-friendly properties. In this research, the quaternized lignin-based dye dispersant (QLD) was prepared using alkali lignin from masson pine sulfate pulping liquor as raw materials by chemical modification, that is, sulfonation and quaternization. The structure and performance characterization of alkali lignin and QLD were studied. The analyses indicated that the structural unit of alkali lignin contained more G type and S type. Additionally, it was also proved that QLD contained quaternary ammonium group, amine group, and sulfonic group, which could improve the dispersion performance and thermostability of QLD. The results of thermogravimetric (TG) concluded that the dispersion performance and thermostability of QLD prevailed over alkali lignin. Compared with the contact angle of water, alkali lignin, and QLD with dye, the contact angle of QLD was much better than water and alkali lignin, indicating that the hydrophilicity and dispersion performance of QLD were superior to water and alkali lignin in Vat Olive T. GRAPHICAL ABSTRACT ARTICLE HISTORY

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“…The use of dispersants is essential in the dyeing of synthetic fibres with disperse dyes . Polymeric dispersants have recently been applied in dyeing to improve dyeing properties . Sodium polynaphthalene sulphonic formaldehyde (PNS) and polyoxyethylene sorbitan ester‐based dispersants were used to disperse quinizarin.…”

Section: Introductionmentioning

confidence: 99%

Effects of the side chain density of polycarboxylate dispersants on dye dispersion properties

Gharanjig

Khosravi

2019

Coloration Technology

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Comb‐like polycarboxylates were synthesised by copolymerisation of methacrylic acid and nonylphenol polyethylene glycol methacrylate ester, and can be used as dye dispersants. In order to achieve good dispersive ability, three polycarboxylates were synthesised, each having a different side chain density. The side chain density of polymers was controlled by different ratios of monomers in the copolymerisation process. Acidic polymers were neutralised using sodium hydroxide. These polymers exhibit good dispersing performance, such that carboxylate groups are adsorbed onto the dye particle surface and the side chains enable the formation of a thick layer, thus providing the steric hindrance effect. Improvement of dye dissolution in the presence of polycarboxylates was studied. Polymers with a lower side chain density demonstrated a higher dye dissolution in water, which could be as a result of more effective adsorption of dispersant on the dye surface (CI Disperse Blue 79). The dyeing performance of the prepared dye dispersions on polyester was investigated. Spectrophotometric analysis of dyed fabrics using synthesised polycarboxylates demonstrates that there should be an optimum side chain density of polymer in order to control both dye solubility and dispersive ability. The result of turbidimetry and particle size analysis have proven this phenomenon. A comb‐like polycarboxylate with optimum side chain density was a better dye dispersant compared with a commercial sodium naphthalene sulphonate compound, as a result of its better heat stability.

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Hydroxypropyl Sulfonated Lignin as Dye Dispersant: Effect of Average Molecular Weight

Cited by 75 publications

References 26 publications

Production and Application of Lignosulfonates and Sulfonated Lignin

Production and Application of Lignosulfonates and Sulfonated Lignin

Quaternized lignin-based dye dispersant: Characterization and performance research

Effects of the side chain density of polycarboxylate dispersants on dye dispersion properties

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