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|Statement||Y.J. Zhou ; supervised by J.C. Roberts..|
|Contributions||Roberts, J. C., Supervisor., Paper Science.|
Download effect of ageing of alkyl ketene dimer sizing
Hydrophobic up-conversion nanocomposite films have been developed based on TEMPO-oxidized cellulose nanofibrils (TOCNF) modified with alkyl ketene dimer (AKD) as a matrix and MF 2:Ho (M = Ca, Sr) as a ation of homogeneous, strong and translucent TOCNF/MF 2:Ho-AKD films with water contact angle of ± 2 ° was accomplished with mild drying at °C.
Alkyl ketene dimer (AKD) has been widely used as a sizing agent in neutral/alkaline papermaking. The reaction of AKD with cellulose to form the β-keto ester is the primary mechanism by which AKD sizes by: The effects of electrolytes and eight different cationic polymers on alkyl ketene dimer (AKD) size retention, extent of reaction and sizing efficiency were investigated using a C labelled.
The MCC was modified using an alkyl ketene dimer (AKD), and modified MCC (MCC-R) was prepared through a series of processes. AKDs are widely used in the paper industry and can enhance the processability and heat resistance of materials, owing to their long alkyl chains [, ].MCC-R and MCC were mixed with PP to perform extrusion, and samples were prepared with different Author: Yeon Sung Ryu, Joo Hyung Lee, Seong Hun Kim.
The production of a hydrophobic starch microcellular foam (SMCF) through the addition of an alkyl ketene dimer (AKD) would be a bio-based material with valuable properties for many applications in which high specific surface area, low density and water resistance is important.
Pigments for paper and coatings are a potential by: Full Article. Effect of Wet-End Additives on the Results of Alkyl Ketene Dimer Sizing after Adding Bacterial Cellulose.
Jinxia Yuan, a,b Ting Wang, a,b Xiannan Huang, a,b and Wei Wei a,b, * Bacterial cellulose is a common research additive in the paper industry because it. The ketone, however, provided rather higher sizing effect than that of AKD, when the paper was heat-treated over.
This result means that the ketone also gives sizing development to paper, moreover. “Alkyl ketene dimer sizing,” BioResources 11(4), the sizing of the resulting paper sheets. Figure 4b shows that the effect of bacterial cellulose on AKD sizing was lower with the dual retention system; however, as the BC dosage increased, the sizing degree continued to decline slightly.
This may have occurred because. The bulking promoter may also have potential to give sizing effects to the paper sheet as well as the increase in paper thickness.
When % AKD was added together with % of bulking promoter, the sizing degree of the handsheet was seconds, and it was almost the same, seconds, as the addition of % AKD only.
Alkyl ketene dimers (AKD) are widely used as internal size in the paper industry to increase paper hydrophobicity and tailor-make its printability. Internal sizing is the process by which paper is made hydrophobic by adsorbing, on the fibres, hydrophobic colloids before the formation of.
Impulse drying has a negative effect on AKD retention and sizing, but PAE and PEI may offer a solution. Impulse drying has been used in the paper machine press section to enhance the dewatering of the paper web through an intense temperature and peak pressure impact. The invention relates to a paste for surface sizing paper, containing an anionic optical brightener and a mixture comprising a cationic polymer dispersion and a cationic or amphoteric alkyl ketene dimer dispersion or emulsion as the sizing agent, and to the use thereof for surface sizing paper, and to the sizing.
The main purpose effect of ageing of alkyl ketene dimer sizing book this study was to investigate the hydrophobic effect and chemical changes induced by thermo-treatment and alkyl ketene dimer (AKD) on the surface properties of Alder (Alnus cordata (Loisel) Duby) wood before and after an artificial weathering test.
Thermal treatment was conducted at a temperature of °C for 4 h in a thermo-vacuum cylinder. Then, the paper sizing. PDF | On Oct 4,Hamidreza Rudi and others published Effect of sizing agent type and amount on the properties of paper containing GCC filler | Find, read and cite all the research you need on.
The main purpose of this study was to investigate the hydrophobic effect and chemical changes induced by thermo-treatment and alkyl ketene dimer (AKD) on the surface properties of Alder (Alnus. Therefore, the use of sizing agents has also witnessed a shift from previous rosin sizing to alkenyl succinic anhydride (ASA) sizing and alkyl ketene dimer (AKD) sizing (Lee and Luner ; Chen et al.
; Song et al. ; Hubbe ). Emulsified AKD is the most widely used neutral sizing. The alkyl ketene dimer was superior in low acidity and in resistance to water, followed by the gelatin size.
The performance of the alkyl ketene dimer was constant with aging; all other samples improved in sizing with aging. Keywords:deacidification. The effect of ageing on alkyl ketene dimer sizing. Author: Zhou, Ya Jun. ISNI: Awarding Body: University of Manchester, Institute of Science and Technology, Current Institution: University of Manchester Date of Award: Availability of Full Text.
Alkyl ketene dimer (AKD) is commonly applied as oil-in-water emulsions in the papermaking industry. Herein a particle stabilized AKD emulsion was developed to avoid the adverse effect of surfactant, further improving the sizing performance and reducing the hydrolysis of AKD emulsions, where layered double hydroxide (LDH) particles were employed as a stabilizer of the AKD.
Alkyl ketene dimer (AKD) sizing of paper under simplified treatment conditions, TAPPI JOURNAL August ABSTRACT: Alkyl ketene dimer (AKD) has been widely used by manufacturers of paper and paperboard as a hydrophobic sizing ry sizing with AKD involves a complex series of processes, including emulsification of the waxy AKD material; measures to avoid the agglomeration of.
USA US07/, USA USA US A US A US A US A US A US A US A US A US A Authority US United States Prior art keywords titanium dioxide process ketene dimer aqueous media weight Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.
The mechanism of alkyl ketene dimer (AKD) sizing on cellulose model films studied by sum frequency generation vibrational spectroscopy Article (PDF Available) in Cellulose 26(5) The invention discloses a preparation method for an AKD (Alkyl Ketene Dimer) emulsion and a water-resistant treatment method for paper sheets.
The preparation method comprises the following steps of firstly, gelatinizing cationic starch, melting AKD wax powder at the temperature of 70 DEG C, then, pouring the gelatinized starch into the melted AKD wax powder, adding a stabilizer into the. Alkyl Ketene Dimer Sizing Reversion and Efficiency in Papers Filled with Calcium Carbonate, Papermakers Conference Proceedings Please Note: This document will be available in PDF format in the "My Electronic Documents" link on the home page once your order has been completed.
edit this book and to members of our families for putting up with us. Also, I would like to thank Alkyl Ketene Dimer Sizes R. Cates, D. Dumas, D. Evans, and J. Rodriguez Effect of Moisture Entering Size Press Effect of Additives on Drying Paper is composed of polysaccharides mainly cellulose and carbohydrates.
The hydroxyl groups present in cellulose react with various substances added to fibrous slurry. Treating the cellulosic fibers chemically, which tends to develop the resistance to aqueous liquid absorption, is known as internal sizing of paper.
The main internal alkaline sizing chemicals are alkyl ketene dimer and alkenyl. Sizing agent (I) for paper, pasteboard and cardboard, comprising a mixt.
of (a) wt% alkyl-ketene dimer dispersion and (b) wt% cationic resin size consisting of a rosin dispersion and poly-(aluminium hydroxy chloride) cpds. Also claimed is a process for sizing paper etc. with (I). The invention discloses an AKD emulsion and a preparation method thereof.
According to the preparation method of the AKD emulsion, as the process of starch gelatinization is saved, and AKD waxes and other raw materials are simultaneously added in the emulsification process, the operation is simple, and the consumed time is obviously shortened.
Papers were treated with alkyl ketene dimer (AKD) to reduce their surface energy. The absorption rate and ink density after printing was characterized.
For some inks, the surface energy of the paper had no influence on ink transfer, while for other inks, a significant difference was seen. It followsthat theadvent of internal sizing methodsin whichacid conditions are notrequired hashad a considerable impact on the problem of deterioration; paperssized byoneofthesemethods, egalkyl ketene dimersize, lose their strength in accelerated ageing tests atamuch slower ratethan comparablepaperssized with rosinandalum (11).
Alkenyl succinic anhydrides (ASA) are modified five-membered succinic anhydrides bearing a branched iso-alkenyl chain (C 14 to C 22).They are colorless, and usually viscous liquids. They are widely used, especially in surface sizing of paper, paperboard, and cardboard, as well as in the hydrophobicization of cellulose fibers.
Products treated with it show reduced penetration of aqueous media. Alkyl Ketene Dimer. C 4 H 4 O 2. Sizing. Alabaster or Annaline. Anhydrate Calcium Sulfate. CaSO 4. Paper Loading material. Alganic Acid. Alganic acid or Na-Alginate. Sizing. Rosin Soap. Sodium Abietate. C 19 H 29 COONa. Sizing.
Salt Cake. Sodium Sulfate. Na 2 SO 4 10H 2 O. Makeup chemical in sulfate pulping chemical recovery (Na 2 SO 4. Surface applications of polyvinyl alcohol and alkyl ketene dimer (AKD) blends demonstrate outstanding improvements in Cobb and Hercules Sizing (HST) values on both acid and alkaline papers, with little or no loss in size values upon aging.
cium carbonate, etc.), natural sizing agents (as starch or rosin), or synthetic ones (as alkyl ketene dimer (AKD) and alkenyl succinic anhydride (ASA)), colorants, and other sub-stances. Pre-industrial European papers often contain rag fiber and gelatin sizing.
Hand-made papers from other regions may include non-wood fibers such as hemp, mulberry. 1. A paste for surface sizing paper, comprising starch and at least one anionic optical brightener, wherein a mixture comprising at least one cationic polymer dispersion and at least one cationic and/or amphoteric alkyl ketene dimer dispersion or emulsion is contained as the sizing.
atin size (Brückle ). While the prevailing use of them during the 19th and 20th centuries for the ﬁrst major inter-nal sizing—rosin-alum sizing—has now been diminished by alkyl succinic anhydride (ASA) and alkyl ketene dimer (AKD) sizing systems, aluminum salts remain ubiquitous in modern. Surface applications of polyvinyl alcohol and alkyl ketene dimer (AKD) blends demonstrate outstanding improvements in Cobb and Hercules Sizing (HST) values on both acid and alkaline papers, with little or no loss in size values upon aging.
Unlike starch, a surface application of polyvinyl alcohol does not degrade the internal sizing effect of a. Internal sizing chemicals used in papermaking at the wet end are alkyl succinic anhydride (ASA), alkyl ketene dimer (AKD) and making the paper web more hydrophobic, the sizing agents influence dewatering and retention of fillers and fibers in the paper sheet.
This study reports the fabrication of superhydrophobic paper via a facile two-step dip coating method. Ground calcium carbonate (GCC) and montmorillonite (MTM) were used as inorganic pigment nanoparticles, and cellulose nanofibers were utilized as a binder to study the effect of forming a superhydrophobic surface on filter paper with alkyl ketene dimer (AKD) treatment.
The micro GCC. Sizing. Alkyl ketene dimer and polyvinyl alcohol. pH extract. Ash content, % Grammage, g/m2. Producer. Tumba AB. Supplied by STFI. Fibre composition. % chemical cellulose. Filler (base) Calcium carbonate. Sizing (base) Alkyl ketene dimer. Sizing (coating) Styrene butadiene latex and carboxy methylcellulose.
Pigment (coating. The increase of tearing resistance after accelerated ageing might in part be due to the aqueous treatment in part to crosslinking in cellulose fibres and sizing (alkyl ketene dimer and polyvinyl al-cohol) caused by the accelerated ageing process. Coated paper Paper made from .The most common chemicals used for sizing process are ASA (Alkenyl Succinic Anhydride) and AKD (Alkyl Ketene Dimer).
g) Retention – The process of retention is used to improve quality, so that the fibres can stick together, providing better yield and minimise loss. Kemira Oyj (Helsinki, Finland; ) has formed a joint venture with a producer of alkyl ketene dimer (AKD) wax in this agreement, Kemira forms a joint venture – Kemira TC Wanfeng Chemicals Yanzhou (NewCo) – with .