Effect of chemical additives on the degradation of polyamideamine-epichlorohydrin (PAE) films and PAEbased papers made from bleached kraft pulps

Siqueira, Éder José; Naoui, W.; Marlin, Nathalie; Schott, Séverine; Mauret, Évelyne

doi:10.3183/npprj-2013-28-04-p529-540

Cited by 8 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Clumps of adhering fibers become flaws in paper and paperboard products and are thus unacceptable. The literature describes many ways of quantifying repulpability including examining paper made from the pulp by using a screening process to isolate and measure fiber clumps after a well-defined mixing process, , measuring the freeness of the resulting pulp suspension, and measuring the wet tensile strength of pulp or paper sheets to be repulped . In this work, we measured the wet tensile strengths of impregnated pulp sheets as an indicator of repulpability.…”

Section: Resultsmentioning

confidence: 99%

High Yield Poly(ethylene-alt-maleic acid) Grafting to Wood Pulp while Minimizing Fiber/Fiber Wet Adhesion

Zhang

Bicho

Doherty³

et al. 2021

Biomacromolecules

View full text Add to dashboard Cite

Heating bleached kraft pulps treated with poly(ethylene-alt-maleic acid) (PEMAc) can lead to high yields of carboxylated polymer grafted to fibers. However, in many cases, the cured, dry pulp cannot be effectively repulped (redispersed in water) because the wet strength is too high. Impregnation with PEMAc solutions at pH 4 followed by high temperature (120−180 °C), catalyst-free curing for short times can give fixation yields >85% while maintaining repulpability. The combination of high fixation yields with low wet strength is possible because the extent of curing required for high grafting yields is less than the curing requirement for high wet strength. Two challenges in moving this technology to practicable applications are (1) identifying the optimum laboratory pulp curing conditions and (2) translating laboratory curing conditions to industrial processes. A modeling tool was developed to meet these challenges. The model is based on the observation that for curing conditions giving high fixation yields the wet tensile indices of grafted pulp sheets showed a power-law dependence on the βΓ product where β is the conversion of the succinic acid moieties in PEMAc to the corresponding succinic anhydride groups in the curing step and Γ is the amount of polymer applied to the pulp. For two PEMAc molecular weights and two pulp types, the power-law slopes were 0.6; however, the pre-exponential terms depended upon the specific polymer and pulp type combination. We propose that the relationships between the wet tensile index and βΓ, from polymer-treated, laboratory pulp handsheets, can be used to predict if proposed curing conditions for larger-scale processes will produce a repulpable product.

show abstract

Section: Resultsmentioning

confidence: 99%

High Yield Poly(ethylene-alt-maleic acid) Grafting to Wood Pulp while Minimizing Fiber/Fiber Wet Adhesion

Zhang

Bicho

Doherty³

et al. 2021

Biomacromolecules

View full text Add to dashboard Cite

show abstract

“…PAE is formed by a polyamideamine structure with 80% of the backbone presenting AZR . Consequently, the NTP PAE film shows formation of a biphasic system and two relaxations when studied by DMA: (i) at ca −5.0°C attributed to the T g of the PAE phase and (ii) at ca 67°C associated to the T g of the polyamideamine phase . The CMC film shows two relaxations at 30 and 230°C attributed to T g and T m , respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Typically, papers treated with wet strength resins retain at least 15% of their dry tensile strength after wetting with water. It is worth noting that these cross‐linked polymers make papers resistant to repulping unless they are attacked with a right combination of chemicals and mechanical energy . Wet strength additives are added in products such as tissue paper, paper towels, milk cartons, photographic base paper, hamburger wrappers, bank notes, waterproof liner boards/corrugated medium, and others, which represent a nonneglected volume of the world annual paper production.…”

Section: Introductionmentioning

confidence: 99%

Carboxymethylcellulose (CMC) as a model compound of cellulose fibers and polyamideamine epichlorohydrin (PAE)–CMC interactions as a model of PAE–fibers interactions of PAE‐based wet strength papers

Siqueira

Salon

Belgacem

et al. 2015

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

Carboxymethylcellulose (CMC) is a cellulose derivative obtained by the carboxymethylation of some hydroxyl groups in the cellulose macromolecules. In this article, we use CMC as a model compound of cellulose fibers to study polyamineamide epichlorohydrin (PAE)-fibers interactions during the preparation of PAE-based wet strength papers. The main advantages of the use of CMC to replace cellulose fibers are its water-soluble character and the homogeneous reaction medium during mixing with PAE resin. Based on 13 C cross-polarization/magic angle spinning nuclear magnetic resonance (CP/MAS NMR) and Fourier transformed infra-red (FTIR) spectroscopy, we prove the formation of ester bonds in PAE-CMC films boosted by a thermal posttreatment at 105 C for 24 h. These ester bonds are derived from a thermally induced reaction between carboxyl groups in the CMC structure and azetidinium ions (AZR) in the PAE resin. PAE-based handsheets were prepared from 100% Eucalyptus fibers. After preparation, some samples were thermally posttreated (TP) at 130 C for 10 min and stored under controlled conditions (25 C and 50% relative humidity or RH). For lowest PAE dosage, storage of the not thermally posttreated (NTP) PAE-based handsheets does not allow them to reach the tensile strength values of TP PAE-based handsheets (at 130 C for 10 min), but the difference in terms of breaking length remains low. For the highest PAE addition level, NTP and TP PAE-based handsheets exhibit close values of the breaking length from 30 days of storage under controlled conditions (25 C and 50% RH). When a thermal posttreatment is applied, the wet strength development of PAE-based papers is a combined effect of homo-and co-cross-linking mechanisms.

show abstract

“…Все перечисленные виды бумаги содержат в своем композиционном составе полиамидаминэпихлоргидриновую смолу. Она придает бумаге необходимую прочность во влажном состоянии и поэтому существенно затрудняет стадию роспуска ее технологических отходов в процессе рециклинга [3][4][5]. Последнее сопровождается снижением производительности оборудования узла роспуска и понесением дополнительных энергетических затрат.…”

Section: òðóäû áãòó ñåðèÿ 2 № 1 2022unclassified

Фундаментальные Свойства Вторичных Волокон, Полученных При Роспуске Влагопрочной Макулатуры

Пенкин¹,

Казаков²

2022

ТРУДЫ БГТУ Серия 2

View full text Add to dashboard Cite

Белорусский государственный технологический университет 2 Северный (Арктический) федеральный университет имени М. В. Ломоносова ФУНДАМЕНТАЛЬНЫЕ СВОЙСТВА ВТОРИЧНЫХ ВОЛОКОН, ПОЛУЧЕННЫХ ПРИ РОСПУСКЕ ВЛАГОПРОЧНОЙ МАКУЛАТУРЫВлагопрочная макулатура ввиду непрерывно возрастающей технико-экономической и социально-экологической целесообразности ее переработки является перспективным источником вторичных волокон. Роспуск влагопрочной макулатуры как первичная стадия ее рециклинга имеет ряд особенностей по сравнению с обычной, невлагопрочной макулатурой: существенно большую продолжительность, повышенную температуру и рН макулатурной массы в ванне гидроразбивателя, присутствие специальных окислительных реагентов. Особые условия роспуска влагопрочной макулатуры находят свое отражение в изменении фундаментальных свойств получаемых вторичных волокон, которые определяют их бумагообразующий потенциал. В связи с этим в статье выполнена комплексная оценка 5 фундаментальных свойств вторичных волокон из макулатуры в виде влагопрочной бумаги на основе сульфатной беленой хвойной целлюлозы.Установлено, что средняя длина волокон (L n , L l , L w , L v ) является практически индифферентной по отношению к двух-и трехкратному сокращению продолжительности роспуска влагопрочной макулатуры, достигаемому за счет ее специальной реагентно-щелочной обработки.Показано, что собственная прочность вторичных волокон, полученных при ускоренном роспуске влагопрочной макулатуры в результате реагентно-щелочной обработки, при аналогичной степени помола (24°ШР) в среднем на 11% выше прочности волокон, полученных при более длительной щелочной обработке. При этом способность вторичных волокон к уплотнению во влажном состоянии и их когезионная способность уменьшаются незначительно -на 5 и 8% соответственно, а грубость вторичных волокон возрастает со 171 до 193-213 мг/м.

show abstract

Effect of chemical additives on the degradation of polyamideamine-epichlorohydrin (PAE) films and PAEbased papers made from bleached kraft pulps

Cited by 8 publications

References 0 publications

High Yield Poly(ethylene-alt-maleic acid) Grafting to Wood Pulp while Minimizing Fiber/Fiber Wet Adhesion

High Yield Poly(ethylene-alt-maleic acid) Grafting to Wood Pulp while Minimizing Fiber/Fiber Wet Adhesion

Carboxymethylcellulose (CMC) as a model compound of cellulose fibers and polyamideamine epichlorohydrin (PAE)–CMC interactions as a model of PAE–fibers interactions of PAE‐based wet strength papers

Фундаментальные Свойства Вторичных Волокон, Полученных При Роспуске Влагопрочной Макулатуры

Contact Info

Product

Resources

About