Tailoring of mechanical properties and printability of coated recycled papers

El-Sherif, Hazem; Nasser, Ali; Hussin, A. I.; El‐Wahab, H. Abd; Ghazy, M. B. M.; Elsayed, Alaa E.

doi:10.1007/s00289-018-2515-7

Cited by 10 publications

(17 citation statements)

References 22 publications

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“…This is because of the strong bond between the printed paper and the prepared ink, which was prepared with the pigment–metal complexes. [ 38 ] Moreover, the particle size of the prepared pigments exerted a real effect on the printing processes. The print gloss and density correlated well.…”

Section: Resultsmentioning

confidence: 99%

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Cu (II), Zn (II), and Ce (III) metal complexes as antimicrobial pigments for surface coating and flexographic ink

Elsawy

Faheim

Salem

et al. 2021

Applied Organom Chemis

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Metal complexes, which were prepared from the reaction of an N‐salicylidene(4‐aminotoluene‐3‐sulfonic acid) Schiff base ligand (H2L) with Cu (II), Zn (II), and Ce (III), were characterized and confirmed by elemental analysis, molar conductance measurement, melting point, Fourier transform infrared (FT‐IR) spectroscopy, proton nuclear magnetic resonance (1H NMR), electronic spectra, magnetic susceptibility, thermal analysis, and qualitative and quantitative antimicrobial studies. The geometry of the compounds was optimized using the semiempirical PM3 Hamiltonian with Restricted Hartree–Fock (RHF) and root‐mean‐square (RMS) gradient of 0.05 kcal/mol. The ligand and its metal complexes were physically incorporated into a water‐based paint and flexographic ink formulation to study their antimicrobial properties and performances as metal‐complex pigments. The results of their performance tests further enhanced their applications as pigments. The mechanical resistance of the prepared paint and ink was also studied to evaluate the possible drawbacks that were associated with the addition of the prepared pigments. Compared with the blank sample, the studies indicated that the physical incorporation of Cu complexes slightly enhanced the mechanical properties of the painted films (the gloss values, hardness, and adhesion) and printed paper (gloss, color strength [density], and abrasion resistance) according to the American Society for Testing and Materials (ASTM). Further, regarding the antimicrobial test, the obtained results can be represented according to the following activity order: the prepared ligand > Zn complex > Ce complex > Cu complex before or after the incorporations of the paint and ink.

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Section: Resultsmentioning

confidence: 99%

“…The grinding, gloss, color strength (density), and abrasion resistance were characterized according to international standard methods. [ 4,5,37–40 ]…”

Section: Methodsmentioning

confidence: 99%

Cu (II), Zn (II), and Ce (III) metal complexes as antimicrobial pigments for surface coating and flexographic ink

Elsawy

Faheim

Salem

et al. 2021

Applied Organom Chemis

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“…The results show that undiluted adhesive has the greatest influence on the strength and energy absorption of kraft paper. El-Sherif et al (2018) modified kraft paper with high -efficiency synthetic adhesive and local pigment and its tensile strength and cracking strength were improved. El-Wakil et al (2015) studied the effects of different proportions of CNC and TiO 2 suspensions on tensile strength (TS), young's modulus and water sensitivity of kraft paper.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of the physical and mechanical properties of kraft paper and watercolor paper

Shi

Zhang

et al. 2021

Maderas, Cienc. tecnol.

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In order to study the feasibility of kraft paper as watercolor paper, the wetting properties, mechanical properties and friction properties of kraft paper and watercolor paper were compared before and after aging. The aging test was carried out on kraft paper and the watercolor paper by aging chamber, the wetting properties of distilled water and three watercolor solutions before and after aging of kraft paper and watercolor paper were compared, tensile tear test of paper on the tensile testing machine, the fracture changes of paper were analyzed by scanning electron microscope, the friction tester performs the paper friction test. The results show that both kinds of paper are amorphous, watercolor paper was showed hydrophobicity before and after the aging, the contact angle was maintained at about 119,09° ± 5° in four different solutions, unaged kraft paper exhibited hydrophilicity, the aged kraft paper showed hydrophobicity with a contact angle of 92,52° ± 1°, the aged kraft paper shows better performance in both tensile and tearing aspects and tensile strength is 20 MPa higher than watercolor paper, the surface roughness of kraft paper is higher than watercolor paper. The experiment is helpful for the market to consider whether the cheaper kraft paper replaces the more expensive watercolor paper in some aspects and provides some scientific reference value for future research.

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“…Semi-continuous emulsion polymerisation, hetero-phase polymerisation with reactive surfactants or non-seeded semi-batch emulsion polymerisation were carried out for different applications for this type of copolymer, such as binders for flexographic printing inks (El–Sherif et al , 2017). Styrene–butyl acrylate (St/BuAc) copolymers were synthesised using different emulsifier systems and modified with acrylamide (El–Sherif et al , 2018). The hydrophobic alkali-soluble emulsion (HASE) was prepared using a semi-batch emulsion polymerisation technique and evaluated as a binder for water-based printing inks (Abd El-Wahab et al , 2019a, 2019b).…”

Section: Introductionmentioning

confidence: 99%

New water-based copolymer nanoparticles and their use as eco-friendly binders for industry of flexographic ink, part I

El‐Wahab

El-Meligi

Hassaan³

et al. 2020

PRT

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Purpose The purpose of this paper is to prepare, characterise and evaluate nano-emulsions of copolymers of various compositions as eco-friendly binders for flexographic ink industry. Design/methodology/approach Various nano-emulsions of copolymers were prepared using styrene (St), butyl acrylate (BuAc), acrylic acid (AA) and acrylamide (AAm) monomers by means of a conventional seeded emulsion polymerisation technique, using K2S2O8 as the initiator. The characterisation of the prepared emulsions was performed using Fourier transform infrared (FT-IR), thermogravimetric analysis (TGA), gel permeation chromatography (GPC) and transmission electron microscopy (TEM). A selection of copolymers was formulated with pigments and additional ingredients, as water-based flexographic inks. The inks were characterised for their viscosity, pH, degree of dispersion, water resistance and colour density. Findings It was found that the low viscosity of the prepared copolymers may reduce the film thickness of the flexographic inks and may also increase the spreading of the ink on the surface. As a result, stable modified polyacrylate-based latex with improved physico-mechanical properties were obtained. The prepared latexes were showed improving and enhancing in water resistance; gloss values, and the print density that ranged from 2.06 to 2.51 and the maximum gloss values (39 and 48) were also obtained. Also, these binders provide excellent adhesion properties for both the pigment particles and the base paper. Practical implications This study focuses on the preparation of new water-based copolymer nanoparticles and their use as eco-friendly binders for flexographic ink industry. Social implications The ink formulations developed could find use in industrial-scale printing. Originality/value Eco-friendly environment ink formulations for printing on paper substrates are novel.

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Tailoring of mechanical properties and printability of coated recycled papers

Cited by 10 publications

References 22 publications

Cu (II), Zn (II), and Ce (III) metal complexes as antimicrobial pigments for surface coating and flexographic ink

Cu (II), Zn (II), and Ce (III) metal complexes as antimicrobial pigments for surface coating and flexographic ink

Comparative analysis of the physical and mechanical properties of kraft paper and watercolor paper

New water-based copolymer nanoparticles and their use as eco-friendly binders for industry of flexographic ink, part I

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