Addition of bentonite to cationic starch matrix for coating on kraftliner paper to improve grease resistance
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Allan de Amorim dos Santos
, Lays Camila Matos
Abstract
In this work, we aimed to analyze suspensions of cationic starch by adding 5 wt%, 7 wt%, and 10 wt% of bentonite as a bilayer coating on kraftliner paper (85 g/m2). The controls were doubly-wet-and-dry and uncoated kraftliner paper. In a coating machine, the formulations were applied until reaching a grammage of 15 g/m2 and then dried at 103 ± 2 °C. The test was carried out about pH, solids content, and viscosity of the suspensions. The physical characteristics of the coated papers were evaluated, as well as their ability to block water, water vapor, and oil/grease. We also analyzed with scanning electron microscopy, Raman spectroscopy, and Fourier transform infrared spectroscopy. The packaging, having a water contact angle of up to 78° and 189 g/m² for Cobb, showed a low resistance to water, which is further responsible for decreased mechanical resistance. Nevertheless, the coating did not change the permeability to water vapor, however, bentonite promoted a decrease in wettability and Cobb value of the paper. The addition of 7 wt% bentonite to the cationic starch matrix promoted high oil resistance with 12 for kit-oil, while 10 wt% bentonite promoted greater pencil hardness, with a value of 8H. Bentonite strength and cationic starch showed good interaction, increasing oil resistance.
Funding source: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Award Identifier / Grant number: 001
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001. The authors are grateful for the support of the Laboratory BioNano from the Federal University of Pelotas – UFPel, the Laboratory of Electron Microscopy and Analysis of Ultrastructural from the Federal University of Lavras – UFLA, and FINEP, FAPEMIG, CNPq, Rede RELIGAR, and CAPES for supplying the equipment and technical support for experiments involving electron microscopy. The authors are also thankful for the Wood Science and Technology graduate program at the Federal University of Lavras – UFLA, and the Forest, Nature, and Biomass section at the University of Copenhagen – UCPH. Likewise, Klabin S/A for supplying commercial kraft paper and some characterization.
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Conflict of interest: The authors have no conflicts of interest to declare.
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Articles in the same Issue
- Frontmatter
- Biorefining
- Possible alternatives for using kraft lignin as activated carbon in pulp mills – a review
- Technical kraft lignin from coffee parchment
- Nitric acid-potassium hydroxide fractionation of rice straw: an integrated biorefinery initiative
- Paper technology
- The influence of fibrous suspension flow regimes on the formation of tissue paper manufactured from different furnish compositions
- Paper physics
- Assessment of paperboard large deformation at fold using digital image correlation technique
- Paper chemistry
- Response surface methodology optimization and antimicrobial activity of berberine modified trimethoprim carboxymethyl cellulose
- Packaging
- Addition of bentonite to cationic starch matrix for coating on kraftliner paper to improve grease resistance
- Recycling
- Changes in water-vapor-adsorption isotherms of pulp fibers and sheets during paper recycling, including drying of wet webs, and disintegration and sonication of dried sheets in water
- Determination of fines in recycled paper
- Disintegration of toilet papers used in shopping malls
- Nanotechnology
- Cryoslash as an effective pre-treatment to obtain nanofibrillated cellulose using ultra-fine friction grinder with kraft pulp
- Pre-treatment with calcium hydroxide and accelerated carbonation for cellulosic pulp fibrillation
- Chemical technology/modifications
- Study on manufacturing hot water-resistant PVOH coated paper by gas grafting palmitoyl chloride (II)–Control of palmitoyl chloride penetration by inorganic pigments coating
- Lignin
- Efficient and eco-friendly isolation and purification of lignin from black liquor with choline chloride-based deep eutectic solvents
- Misc
- Flocculation of alkyl ketene dimer and calcium carbonate on paper sizing and filling performance
Articles in the same Issue
- Frontmatter
- Biorefining
- Possible alternatives for using kraft lignin as activated carbon in pulp mills – a review
- Technical kraft lignin from coffee parchment
- Nitric acid-potassium hydroxide fractionation of rice straw: an integrated biorefinery initiative
- Paper technology
- The influence of fibrous suspension flow regimes on the formation of tissue paper manufactured from different furnish compositions
- Paper physics
- Assessment of paperboard large deformation at fold using digital image correlation technique
- Paper chemistry
- Response surface methodology optimization and antimicrobial activity of berberine modified trimethoprim carboxymethyl cellulose
- Packaging
- Addition of bentonite to cationic starch matrix for coating on kraftliner paper to improve grease resistance
- Recycling
- Changes in water-vapor-adsorption isotherms of pulp fibers and sheets during paper recycling, including drying of wet webs, and disintegration and sonication of dried sheets in water
- Determination of fines in recycled paper
- Disintegration of toilet papers used in shopping malls
- Nanotechnology
- Cryoslash as an effective pre-treatment to obtain nanofibrillated cellulose using ultra-fine friction grinder with kraft pulp
- Pre-treatment with calcium hydroxide and accelerated carbonation for cellulosic pulp fibrillation
- Chemical technology/modifications
- Study on manufacturing hot water-resistant PVOH coated paper by gas grafting palmitoyl chloride (II)–Control of palmitoyl chloride penetration by inorganic pigments coating
- Lignin
- Efficient and eco-friendly isolation and purification of lignin from black liquor with choline chloride-based deep eutectic solvents
- Misc
- Flocculation of alkyl ketene dimer and calcium carbonate on paper sizing and filling performance