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Effect of a waterproof agent on gypsum particleboard properties

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Published/Copyright: May 3, 2006
Holzforschung
From the journal Volume 60 Issue 3

Abstract

This paper describes the influence of the addition of an organosilicon waterproof agent on the properties of gypsum particleboard (GPB). Test results showed that the additive at an appropriate concentration reduces the thickness swelling (TS) and water absorption (WA), and increases the mechanical properties. TS was lowered to ∼1.6% and internal bond strength (IB) was increased to ∼0.4 MPa when 3% organosilicon agent was added. Accordingly, the TS was reduced by 53% and the IB increased by 45% relative to control board without additives. The modulus of rupture (MOR) and modulus of elasticity (MOE) were also increased in the presence of the organosilicon waterproof agent. The effect was pronounced for MOR. On the other hand, too high a content of organosilicon additive had a negative effect and the corresponding property values were poorer. X-Ray diffraction revealed that the content of gypsum dihydrate increased in the presence of the additive, but other chemical changes were not observed. Scanning electron microscopy (SEM) confirmed that the crystal size in gypsum was reduced is the presence of the additive.

Keywords: gypsum particleboard; organosilicon waterproof agent; pH value; SEM; waterproof property; X-ray diffraction
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Corresponding author. Nanjing Forestry University, Longpan Road 159, Nanjing 210037, PR China Fax: +86-25-85427948

References

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Published Online: 2006-05-03
Published in Print: 2006-05-01

©2006 by Walter de Gruyter Berlin New York

Articles in the same Issue

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  2. Application of UV-Vis and resonance Raman spectroscopy to study bleaching and photoyellowing of thermomechanical pulps
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  5. Calculation of the relative bonded area and scattering coefficient from sheet density and fibre shape
  6. Formic and acetic acids in archaeological wood. A comparison between the Vasa Warship, the Bremen Cog, the Oberländer Boat and the Danish Viking Ships
  7. Time-domain 1H NMR characterization of the liquid phase in greenwood
  8. Chemical reaction of alkoxysilane molecules in wood modified with silanol groups
  9. Dimensional stability of MDF panels produced from heat-treated fibres
  10. Multivariate modeling of MDF panel properties in relation to wood fiber characteristics
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  14. Fracture cleavage analysis of PVAc latex adhesives: Influence of phenolic additives
  15. Effect of a waterproof agent on gypsum particleboard properties
  16. Effects of semi-isostatic densification on anatomy and cell-shape recovery on soaking
  17. Analytical tools to predict changes in properties of oriented strandboard exposed to the fungus Postia placenta
  18. The effect of CaCl2 on growth rate, wood decay and oxalic acid accumulation in Serpula lacrymans and related brown-rot fungi
https://doi.org/10.1515/HF.2006.051
Keywords for this article
gypsum particleboard; organosilicon waterproof agent; pH value; SEM; waterproof property; X-ray diffraction

Articles in the same Issue

  1. Brightness stabilisation of bleached high-yield pulps by novel sulfur-containing inhibitors
  2. Application of UV-Vis and resonance Raman spectroscopy to study bleaching and photoyellowing of thermomechanical pulps
  3. Characteristics of NAEM salt-catalyzed alcohol organosolv pulping as a biorefinery
  4. Effect of poly(ethylene oxide) molecular mass on miscibility and hydrogen bonding with lignin
  5. Calculation of the relative bonded area and scattering coefficient from sheet density and fibre shape
  6. Formic and acetic acids in archaeological wood. A comparison between the Vasa Warship, the Bremen Cog, the Oberländer Boat and the Danish Viking Ships
  7. Time-domain 1H NMR characterization of the liquid phase in greenwood
  8. Chemical reaction of alkoxysilane molecules in wood modified with silanol groups
  9. Dimensional stability of MDF panels produced from heat-treated fibres
  10. Multivariate modeling of MDF panel properties in relation to wood fiber characteristics
  11. Viscoelastic behaviour of solid wood under compressive loading
  12. The creep of wood destabilized by change in moisture content. Part 3: The influence of changing moisture history on creep behavior
  13. Air permeability of aspen veneer and glueline: Experimentation and implications
  14. Fracture cleavage analysis of PVAc latex adhesives: Influence of phenolic additives
  15. Effect of a waterproof agent on gypsum particleboard properties
  16. Effects of semi-isostatic densification on anatomy and cell-shape recovery on soaking
  17. Analytical tools to predict changes in properties of oriented strandboard exposed to the fungus Postia placenta
  18. The effect of CaCl2 on growth rate, wood decay and oxalic acid accumulation in Serpula lacrymans and related brown-rot fungi
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