Brightness stabilisation of bleached high-yield pulps by novel sulfur-containing inhibitors
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Mario Beyer
, Klaus Fischer and Hans-Ulrich Süss
Abstract
The stabilisation of a peroxide-bleached chemothermomechanical pulp against light-induced yellowing by novel sulfur-containing radical-scavenging compounds was investigated. Substances were identified that lack the unpleasant odour typical for compounds containing thiol groups. High inhibition effects were observed when the sulfur compounds were combined with small amounts of hindered amines and UV absorbers. A novel group of thiols isolated from biomatter was among the sulfur-containing inhibitors. Photoyellowing could be avoided for 3 years in real conditions when the inhibitors were applied as part of a coating. The ability of the thiol compounds to scavenge phenoxy radicals was demonstrated by ESR spectroscopy of irradiated chemithermomechanical pulp sheets. The results are encouraging for efficient brightness stabilisation of high-yield pulps.
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©2006 by Walter de Gruyter Berlin New York
Articles in the same Issue
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Articles in the same Issue
- Brightness stabilisation of bleached high-yield pulps by novel sulfur-containing inhibitors
- Application of UV-Vis and resonance Raman spectroscopy to study bleaching and photoyellowing of thermomechanical pulps
- Characteristics of NAEM salt-catalyzed alcohol organosolv pulping as a biorefinery
- Effect of poly(ethylene oxide) molecular mass on miscibility and hydrogen bonding with lignin
- Calculation of the relative bonded area and scattering coefficient from sheet density and fibre shape
- Formic and acetic acids in archaeological wood. A comparison between the Vasa Warship, the Bremen Cog, the Oberländer Boat and the Danish Viking Ships
- Time-domain 1H NMR characterization of the liquid phase in greenwood
- Chemical reaction of alkoxysilane molecules in wood modified with silanol groups
- Dimensional stability of MDF panels produced from heat-treated fibres
- Multivariate modeling of MDF panel properties in relation to wood fiber characteristics
- Viscoelastic behaviour of solid wood under compressive loading
- The creep of wood destabilized by change in moisture content. Part 3: The influence of changing moisture history on creep behavior
- Air permeability of aspen veneer and glueline: Experimentation and implications
- Fracture cleavage analysis of PVAc latex adhesives: Influence of phenolic additives
- Effect of a waterproof agent on gypsum particleboard properties
- Effects of semi-isostatic densification on anatomy and cell-shape recovery on soaking
- Analytical tools to predict changes in properties of oriented strandboard exposed to the fungus Postia placenta
- The effect of CaCl2 on growth rate, wood decay and oxalic acid accumulation in Serpula lacrymans and related brown-rot fungi