Enhancing Insulating Performances of Presspaper by Introduction of Nanofibrillated Cellulose

Huang, Jianwen; Zhou, Yuanxiang; Dong, Longyu; Zhou, Zhongliu; Zeng, Xiangjun

doi:10.3390/en10050681

Cited by 13 publications

(7 citation statements)

References 34 publications

(49 reference statements)

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“…With an increasing amount of nanocellulose added to presspaper, the performance of presspaper exhibits a clear, non-linear relationship [ 34 ]. When the CNFC content does not exceed 2.5 wt %, there is an obvious linear relationship between the breakdown strength and the nanocellulose content of presspaper.…”

Section: Resultsmentioning

confidence: 99%

Predicting the Dielectric Properties of Nanocellulose-Modified Presspaper Based on the Multivariate Analysis Method

Zhou

Huang

et al. 2018

Molecules

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Nanocellulose-modified presspaper is a promising solution to achieve cellulose insulation with better performance, reducing the risk of electrical insulation failures of a converter transformer. Predicting the dielectric properties will help to further design and improvement of presspaper. In this paper, a multivariable method was adopted to determine the effect of softwood fiber on the macroscopic performance of presspaper. Based on the parameters selected using the optimum subset method, a multiple linear regression was built to model the relationship between the fiber properties and insulating performance of presspaper. The results show that the fiber width and crystallinity had an obvious influence on the mechanical properties of presspaper, and fiber length, fines, lignin, and nanocellulose had a significant impact on the breakdown properties. The proposed models exhibit a prediction accuracy of higher than 90% when verified with the experimental results. Finally, the effect of nanocellulose on the breakdown strength of presspaper was taken into account and new models were derived.

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Section: Resultsmentioning

confidence: 99%

Predicting the Dielectric Properties of Nanocellulose-Modified Presspaper Based on the Multivariate Analysis Method

Zhou

Huang

et al. 2018

Molecules

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“…Cellulose is seen as a potential candidate in thermal and electrical insulation applications, due to its excellent properties that include an easy manufacturing process and high thermal stability [11]. Huang et al (2017) found that the introduction of 10 wt.% of nano-fibrillated cellulose (NFC) not only enhanced the breakdown performance, but also improved its thermal and mechanical properties [12]. The permittivity of electrical grade pulp approached 5.3, and tan δ lies between 0.01 and 0.02 at 50 Hz.…”

Section: Introductionmentioning

confidence: 99%

Effect of Impregnated Phenolic Resins on the Cellulose Membrane for Polymeric Insulator

et al. 2022

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In this study, a cellulose membrane (CM) was chemically treated with phenolic (PF) resin to improve its performance as a polymeric insulator. The CM was prepared from kenaf pulp, and the PF was synthesized from oil palm empty fruit (EFB) fibre. Four different concentrations of synthesized PF resin (5, 10, 15, and 20 wt.%) were impregnated under wet or dry conditions. Thermal analysis of the phenolic cellulose membrane (PCM) showed that the samples had good chemical interaction and compatibility. The PF uptake in the wet phenolic cellulose membrane (PCMW) was higher than in the dry phenolic cellulose membrane (PCMD). During the PF uptake, the CM underwent solvent exchange and absorption in wet and dry membranes, respectively. This difference also affected the crosslinking of PCM samples via the formation of methylene bridges. Due to the PF treatment, the PCM showed lower water absorption than CM. The PF concentrations also affect the surface roughness and electrical properties of PCM samples. These findings prove that PCM can be used as a renewable and green polymer electrical insulator.

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“…Howerver, mechanical properties, which play a crucial role in determining the lifetime of insulating paper, normally decreased (Zhang et al 2015;Tang et al 2016). In addition, preparation process for the aforementioned nanomodified paper was usually complex due to the incompatibility between inorganic nanoparticles and organic cellulose fibers (Huang et al 2017;Tang et al 2017;Cao et al 2019). Therefore, an organic nano-additive may be a good substitute, especially when it originates from cellulose fiber.…”

Section: Introductionmentioning

confidence: 99%

“…Compared to the inorganic nanoparticles, CNCs prepared from natural cellulose fiber are more compatible with cellulose insulation, and they have potential application in transformer insulating paper. Huang et al (2017) explored different concentrations of nanofibrillated cellulose, cationic nanofibrillated cellulose, and anionic nanofibrillated cellulose as the potential nanoadditives on the mechanical and breakdown properties of insulating press paper. The results showed that the addition of nano-cellulose of 10 wt% can improve the tensile strength and insulation properties of insulating press paper.…”

Section: Introductionmentioning

confidence: 99%

Effect of cellulose nanocrystals on the performance of oil-immersed transformer insulating paper

Chen

Kang

Zhi

et al. 2019

BioRes

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The possibility of enhancing both mechanical and breakdown properties of oil-immersed transformer insulating paper were considered by introduction of cellulose nanocrystals (CNCs). Two kinds of CNCs were taken into account: the TEMPO-oxidized CNCs (T-CNC) and the sulfuric acid hydrolyzed CNCs (S-CNC). Insulating paper containing no CNCs was also prepared as a reference. Obtained samples were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The effects of different amounts of CNC on tensile strength, AC breakdown strength, oil absorption rate, and conductivity of insulating paper extract were studied. The CNC improved the mechanical and electrical performances of insulating paper, and the effect of T-CNC was a little better than that of S-CNC. When the T-CNC dosage was 0.9%, the tensile strength, AC breakdown strength in oil, and oil absorption rate of the insulating paper were 70.22 N • m/g, 59.8 kV/mm, and 53.1%, respectively, which was improved by 21.7%, 24.6%, and 39.4%, respectively, compared with the reference insulating paper. The beating degree of pulp also affected the mechanical and electrical properties of insulating paper containing CNC. Based on overall performance, it was concluded that CNCs are promising nano-additives for oil-immersed transformer insulating paper, especially for T-CNC.

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Enhancing Insulating Performances of Presspaper by Introduction of Nanofibrillated Cellulose

Cited by 13 publications

References 34 publications

Predicting the Dielectric Properties of Nanocellulose-Modified Presspaper Based on the Multivariate Analysis Method

Predicting the Dielectric Properties of Nanocellulose-Modified Presspaper Based on the Multivariate Analysis Method

Effect of Impregnated Phenolic Resins on the Cellulose Membrane for Polymeric Insulator

Effect of cellulose nanocrystals on the performance of oil-immersed transformer insulating paper

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