Marion Thébault¹, Ya Li¹, Christopher Beuc¹, Stephan Frömel-Frybort^1,2, Edith-Martha Zikulnig-Rusch¹, Larysa Kutuzova³, Andreas Kandelbauer^3,*

Journal of Renewable Materials, Vol.8, No.10, pp. 1181-1198, 2020, DOI:10.32604/jrm.2020.09755

Abstract High Pressure Laminates (HPL) panels consist of stacks of self-gluing paper sheets soaked with phenol-formaldehyde (PF) resins. An important requirement for such PFs is that they must rapidly penetrate and saturate the paper pores. Partially substituting phenol with bio-based phenolic chemicals like lignin changes the physico-chemical properties of the resin and affects its ability to penetrate the paper. In this study, PF formulations containing different proportions of lignosulfonate and kraft lignin were used to prepare paper-based laminates. The penetration of a Kraft paper sheet was characterized by a recently introduced, new device measuring the conductivity between both sides of the… More >

Marion Thébault¹, Larysa Kutuzova², Sandra Jury¹, Iris Eicher¹, Edith-Martha Zikulnig-Rusch¹, Andreas Kandelbauer^2,*

Journal of Renewable Materials, Vol.8, No.6, pp. 603-630, 2020, DOI:10.32604/jrm.2020.09616

Abstract Here, the effects of substituting portions of fossil-based phenol in phenol formaldehyde resin by renewable lignin from two different sources are investigated using a factorial screening experimental design. Among the resins consumed by the wood-based industry, phenolics are one of the most important types used for impregnation, coating or gluing purposes. They are prepared by condensing phenol with formaldehyde (PF). One major use of PF is as matrix polymer for decorative laminates in exterior cladding and wet-room applications. Important requirements for such PFs are favorable flow properties (low viscosity), rapid curing behavior (high reactivity) and sufficient self-adhesion capacity (high residual… More >