Improvements in Fire Resistance, Decay Resistance, Anti-Mold Property and Bonding Performance in Plywood Treated with Manganese Chloride, Phosphoric Acid, Boric Acid and Ammonium Chloride

Wu, Zhigang; Deng, Xue; Luo, Zhongyou; Zhang, Bengang; Xi, Xuedong; Li, Lifen

doi:10.3390/coatings11040399

Cited by 11 publications

(8 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Kuzen., Eucalyptus robusta Smith, Pinus massoniana Lamb., and so on, all of which usually contain a high content of juvenile wood, along with numerous defects such as loose texture, low density, low strength, poor corrosion resistance, and inflammability [1][2][3][4], so it is especially important to conduct functional improvement of fast-growing woods in plantations. Wood modification methods mainly include acetylation, impregnation, compression, fire-retarding, and heat treatment, among which heat treatment-assisted wood modification has been extensively studied [5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Effects of Heat Treatment on Interfacial Properties of Pinus Massoniana Wood

Deng

et al. 2021

Coatings

Self Cite

View full text Add to dashboard Cite

Understanding the interfacial changes of wood during heat treatment can facilitate the improvement of the bonding and coating processes of heat-treated wood. Steam was used as the medium to modify Pinusmassoniana wood through heat treatment at 160, 180, 200, and 220 °C. Changes to the surface characteristics after heat treatment were characterized by Fourier transform-infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscope (SEM) and contact angle measurement. The results showed that: (1) hemicelluloses were the first to experience degradation at 160 °C, and this degradation was the most intense at 200 °C. The cellulose started experiencing obvious degradation at 200 °C, while there was less degradation of lignin at this temperature. (2) Oxygen-containing groups like hydroxyl and carbonyl were gradually reduced as temperature increased with deepened color and passivated surface. (3) Cellulose crystallinity presented a variable trend of increasing–decreasing–increasing. (4) Surface porosity and roughness of Pinus massoniana wood both increased after heat treatment. (5) The Pinus massoniana wood interface turned from hydrophilic to hydrophobic, and 180 °C was a turning point for the wettability of the Pinus massoniana wood interface.

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of Heat Treatment on Interfacial Properties of Pinus Massoniana Wood

Deng

et al. 2021

Coatings

Self Cite

View full text Add to dashboard Cite

show abstract

“…Boric acid often has a negative impact on the strength of glued joints, as was observed, for example, in laminated veneer lumbers (LVLs) manufactured from beech and pine wood veneers using phenol-formaldehyde (PF) and melamine-formaldehyde (MF) glues [27]. Similarly, the experiments conducted by Wu et al [28] mentioned the fact that the strength of glued joints in plywood made from pine wood veneers impregnated with a 6% aqueous solution of H 3 BO 3 was reduced; however, the standard value for the glued joint was still met and the fire resistance of plywood improved. The negative effect of wood impregnation with the compounds of trivalent boron-boric acid or sodium tetraborate-on a decrease in strength of glued joints can be significantly affected by the type of wood and type of polymer used as adhesive or coating [29][30][31].…”

Section: Introductionmentioning

confidence: 85%

The Effect of Inorganic Preservatives in the Norway Spruce Wood on Its Wettability and Adhesion with PUR Glue

Ciglian

Reinprecht

2022

Applied Sciences

View full text Add to dashboard Cite

Recycled recovered wood, for example, from historic buildings, containing biocides, fire retardants or anti-weather paints is an attractive material for manufacturing composite wood panels which can be used for decoration as well as load-bearing walls with a typical patina. This paper investigates the effect of four inorganic wood preservatives—CuSO4·5H2O, ZnCl2, H3BO3 and (NH4)2SO4—commonly used in the past, with the focus on their effect on the quality of wood bonding. The milled surfaces of Norway spruce (Picea abies Karst L.) wood were treated with 0.5, 1 and 2% aqueous solutions of these preservatives. The effect of preservatives in spruce wood was evaluated: (1) by its wettability with the drops of redistilled water, measuring the contact angles; (2) by the shear strength of the “spruce wood—polyurethane (PUR) Kestopur 1030 glue” interphases according to the standard EN 205; (3) by microscopic analysis of the “wood—PUR” interphases. The wettability of spruce wood worsened when using ZnCl2, by a maximum of 28.2%, but on the contrary, it improved due to other preservatives mainly by using (NH4)2SO4, at a maximum of 22.9%. In general, the shear strength of glued joints “wood—PUR” continually decreased with higher concentrations of all the preservatives. The most significant decrease of adhesion “wood—PUR”, by 19.8% from 10.66 MPa to 8.55 MPa, was caused by 2% ZnCl2 used for the treatment of both spruce wood specimens in interphase with the PUR glue. On the contrary, the less significant decrease of adhesion “wood—PUR”, by 2.5%, was caused by 0.5% (NH4)2SO4 applied only on one surface of the two inter-bonded spruce wood specimens. The effects of preservatives on the wood wettability and its adhesion with PUR glue were partly confirmed by microscopic analysis.

show abstract

“…Generally, water-borne anti-mold agents, featured in green processes, could effectively resist mold infestation on wood surfaces, such as didecyl dimethyl ammonium chloride, borates, and quaternary ammonium salts [ 8 , 9 , 10 , 11 ]. However, they are susceptible to migration and leaching when applied in humid environments, resulting in reduced anti-mildew efficiency and potential environmental pollution [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Leachability and Anti-Mold Efficiency of Nanosilver on Poplar Wood Surface

Dai

Luo

et al. 2022

Polymers

View full text Add to dashboard Cite

Water-based antimicrobial agents, used in environmentally friendly applications, are widely used in wood protection industries. Furthermore, nanomaterials as antimicrobial agents, because of their biocidal component, huge specific surface area, and unique nanoscale effect, have attracted attention in the field of biodurability. We employed aqueous dispersed nano-silver with a diameter of 10 nm~20 nm to treat poplar wood and evaluated its leaching resistance and anti-mold effect on the wood surface. The results revealed that the higher the retention of the nano-silver, the stronger the protection efficiency of the wood surface against three molds (Aspergillus niger V. Tiegh, Penicillium citrinum Thom, and Trichoderma viride Pers. ex Fr); and the leachability of the nano-silver presented a slowly growing trend with the increase in the retention. When the wood surface attained a silver retention of 0.324 g·m−2, its anti-mold efficiency against Aspergillus niger V. Tiegh, Penicillium citrinum Thom, and Trichoderma viride Pers. ex Fr reached 80, 75, and 80%, respectively, which achieved or even exceeded the required standard value of effective mold inhibition (75%). Notably, the nano-silver leaching rate at this retention attained merely 4.75 %. The nanoparticle, well distributed on a wood surface, may promote sufficient contact with fungi as well as strong interaction with wood cell wall components, which probably contributed to the effective anti-mold efficiency and the leaching resistance. This study provided positive evidence for the anti-mold effect of nano-silver on wood surface.

show abstract

Improvements in Fire Resistance, Decay Resistance, Anti-Mold Property and Bonding Performance in Plywood Treated with Manganese Chloride, Phosphoric Acid, Boric Acid and Ammonium Chloride

Cited by 11 publications

References 32 publications

Effects of Heat Treatment on Interfacial Properties of Pinus Massoniana Wood

Effects of Heat Treatment on Interfacial Properties of Pinus Massoniana Wood

The Effect of Inorganic Preservatives in the Norway Spruce Wood on Its Wettability and Adhesion with PUR Glue

Leachability and Anti-Mold Efficiency of Nanosilver on Poplar Wood Surface

Contact Info

Product

Resources

About