Effect of modified bamboo lignin replacing part of C5 petroleum resin on properties of polyurethane/polysiloxane pressure-sensitive adhesive and its application on the wood substrate

This paper reports a fresh and robust strategy to develop polyurethane/polysiloxane pressure-sensitive adhesives (PSAs) with excellent properties by replacing part of C5 petroleum resin with modified lignin. A unique aspect of this work is the use of renewable lignin to obtain modified monomers. The phenolic hydroxyl group of lignin is increased by 21.4% after demethylation, which will help to introduce 6-bromo-1 -hexene into the lignin structure through Williamson method. The L-3 lignin and C5 petroleum resin are mixed with polyurethane/polysiloxane prepolymer, and furthermore a series of PSAs are obtained under ultraviolet light. It turns out that L-3 lignin can not only replace part of C5 petroleum resin, but also obtain attractive and controllable features. Especially when the mass ratio of C5 petroleum resin to L-3 lignin is 6:4, compared with pure C5 petroleum resin, the 180 degrees peel strength and the shear strength of PU46 are increased by 24.1% and 91.5% respectively. Additionally, the shear strength on the wood substrate is increased by 320.6%. This study provides an effective method for the preparation of high valueadded lignin PSA, and expands the application fields of PSA. (C) 2021 Elsevier Inc. All rights reserved.

Automated summary

The study presents a novel strategy of developing polyurethane/polysiloxane PSAs with excellent properties by replacing part of C5 petroleum resin with modified lignin. The modified lignin significantly improves the peel strength and shear strength of the adhesive, demonstrating promising application prospects in the field of pressure-sensitive adhesives.