Effect of Kraft lignin from hardwood on the viscoelastic, thermal, mechanical and aging performance of high pressure laminates

M.E. TAVERNA; O. TASSARA; J. MORAN; M. SPONTÓN; V. NICOLAU; P. FRONTTINI; D. ESTENOZ

Waste and Biomass Valorization

Springer

Lugar: New York ; Año: 2017 vol. 10 p. 585 - 597

1877-2641

In this work, the synthesis and characterization of phenol-formaldehyde resols modifiedwith 10, 20 and 30 wt% of hardwood Kraft lignin (a waste from pulp industry) werestudied. In all cases, the Kraft lignin was activated by hydroxymethylation. The resolscharacterization involved industrial measurements of free formaldehyde, viscosity, totalsolids and density. The resins were used for the industrial impregnation of Kraft-typepaper and the production of laboratory laminates. The laminates were mechanicallyand thermally characterized. Mechanical measurements included tensile, flexural,impact and interlaminar tests. Thermogravimetric and dynamic techniques were usedfor the thermal characterization. In addition, the aging of the materials in water wasstudied. No significant differences in mechanical and thermal properties betweentraditional and modified materials were found with replacement up to 20 wt% of phenol.Modified laminates exhibited better water resistance due to the hydrophobicity of lignin.The work was carried out in collaboration with Centro S.A., San Francisco, Córdoba,Argentina, which produces high pressure laminates