Application of the Rosin from White Pitch (Protium heptaphyllum) for use as Wood Adhesive

Abstract Cross sections of wood adhesive bonds were studied by scanning thermal microscopy (SThM) with the aim of scrutinizing the distribution of adhesive in the bond line region. The distribution of thermal conductivity, as well as temperature in the bond line area, was measured on the surface by means of a nanofabricated thermal probe offering high spatial and thermal resolution. Both the thermal conductivity and the surface temperature measurements were found suitable to differentiate between materials in the bond region, i.e., adhesive, cell walls and embedding epoxy. Of the two SThM modes available, the surface temperature mode provided images with superior optical contrast. The results clearly demonstrate that the polyurethane adhesive did not cause changes of thermal properties in wood cell walls with adhesive contact. By contrast, cell walls adjacent to a phenol-resorcinol-formaldehyde adhesive showed distinctly changed thermal properties, which is attributed to the presence of adhesive in the wood cell wall.

Download Full-text

Bond Performance and Structural Characterization of Polysaccharide Wood Adhesive Made from Konjac Glucomannan/Chitosan/Polyvinyl Alcohol

BioResources ◽

10.15376/biores.11.4.8166-8177 ◽

2016 ◽

Vol 11 (4) ◽

Cited By ~ 2

Author(s):

Rong Gu ◽

Baoning Mu ◽

Yanpu Yang

Keyword(s):

Polyvinyl Alcohol ◽

Structural Characterization ◽

Wood Adhesive ◽

Konjac Glucomannan ◽

Bond Performance

Download Full-text

Preparation and Characterization of Silicate Wood Adhesive Modified with Ammonium Stearate

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1033-1034.1048 ◽

2014 ◽

Vol 1033-1034 ◽

pp. 1048-1053 ◽

Cited By ~ 1

Author(s):

Xin Li Zhang ◽

Hong Hui Zhang ◽

Yi Qiang Wu ◽

Yun Chu Hu

Keyword(s):

Bonding Strength ◽

Water Resistance ◽

Wood Adhesive ◽

National Standard ◽

Adhesion Properties ◽

Good Thermal Stability ◽

Thermo Gravimetric Analyzer ◽

Infrared Spectrometer ◽

Grade Ii

In order to improve the water resistance of silicate wood adhesive, a kind of silicate adhesive was prepared from water glass with silica as curing agent, and ammonium stearate as modifier. The chemical structure, surface morphology and thermal properties of the silicate adhesive were characterized by Fourier transform infrared spectrometer, scanning electron microscope, and thermo-gravimetric analyzer. As the two main measures of adhesion properties, the bonding strength and water resistance were also determined. The results showed that ammonium stearate was successfully introduced into the molecule structure of silicate, the silicate adhesive have good thermal stability in the range of 30~800 °C and the modified silicate adhesive had more smooth cured morphology. The bonding strength and 24h water absorption rate of poplar plywood glued by the silicate adhesive was 0.71 MPa and 22.81%, respectively, reaching the grade II of plywood performance's national standard.

Download Full-text