Lignin from second-generation biorefinery for pressure-sensitive adhesive tapes

In this work, the potential of lignin as a filler additive and anti-aging agent in a pressure-sensitive adhesive (PSA) based on natural rubber (NR) was investigated. Herein, different approaches to incorporate lignin into NR matrix by adaptation of a two-step compounding process were evaluated. At first, a twin-screw extruder (TSE) was utilized to prepare pre-formulations followed by the secondary finalization of adhesive mass inside a planetary roll extruder (PRE). For the industrial production of PSAs, the adhesive mass is required to have well-distributed additive materials and adequate adhesion, cohesion, and longevity. The impact of the added lignin was evaluated concerning optical appearance, compatibility between lignin and rubber/resin, adhesion performance, shear strength, thermal stability, antioxidant capability, dynamic-mechanical behavior, aging behavior at elevated temperature and under UV exposure, and filler morphology. It was found that the PSAs including aquasolv (AS) lignin after the spray-drying post-treatment exhibited excellent thermal, mechanical, and antioxidative properties. Thus, it was shown that the sustainably producible lignin can be utilized both as filler and antioxidant in natural rubber-based pressure-sensitive adhesive masses with comparable performance properties as commercially available products.

Subjects

Biorefinery lignin

Lignin valorization

Liquid hot water

Particle formulation

Press-sensitive adhesives

DDC Class

600: Technik

Funding Organisations

Bundesministerium für Bildung und Forschung (BMBF)

More Funding Information

This work was financially supported by the German Federal Ministry of Education and Research (BMBF) in the context of the German project cluster BIOREFINERY2021 (031A233).

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Lignin from second-generation biorefinery for pressure-sensitive adhesive tapes