Oral presentation

3.3 Development of biobased terpenoid-acrylic copolymers incorporating lignin-based UV blockers for wood protection

Laurence PODGORSKI

Wood Protection Research Manager

Technological Institute FCBA

Co-author(s):
Gilles  LABAT, Technological Institute FCBA
Garbine Aguirre Ugarte, IPREM, Université de Pau et des Pays de l’Adour
Laurent Billon, IPREM, Université de Pau et des Pays de l’Adour

One of the main resources for renewable materials has been wood waste. In this sense, terpenes, which are extracted from coniferous trees as well as citrus fruits, are an exploitable category of biomass.The objective of this study is to develop innovative wood coatings using renewable bio-based polyacrylates from terpenoids, a subclass of terpenes used on multi ton-scale in the food and fragrance industries. For this purpose, different copolymers based on menthyl (MnA), thymyl (ThymA) and tetrahydrogeranyl acrylates (THGA) have been synthesized by FR(c)P in solution and characterized to understand the copolymerization and copolymer microstructure. The mixture of the terpene acrylates in the latexes made it possible to target a glass transition temperature adapted to the desired behavior of the coating film depending on the end-use.The optimization of the FR(c)P in miniemulsion with high solid content (45 wt%) has been achieved. This paper presents the performance of the terpenoid-based coatings in comparison with one commercial acrylic coating for exterior wood.  In addition, lignin as a bio-based additive was introduced to provide new functionalities to the terpenoid-acrylates based matrices. Different types of lignin from maritime pine and eucalyptus were produced by the Technological Institute FCBA. The difference among them was the ratio among the p-hydroxyphenyl (H), gualacyl (G) and syringyl (S) groups. They have been introduced in the terpenoid-based coatings. Transmittance measurements were carried out on free films of coatings. Then the different bio-based coatings were applied to wood samples. The influence of lignin addition on UV protection, optical properties, surface hardness, and moisture resistance are presented in this paper and compared to commercial coatings.Our project also considers the use of terpenes directly derived from wood industry by-products leading to a unique concept of protecting wood with coatings made from wood products.

References:1) Mezzasalma L., Labat G., Billon L., Podgorski L. Development of Fully Terpenoids-Acrylic Copolymers for Bio-based Wood Coatings. Proceedings of the 13th International Woodcoatings Congress, Amsterdam 22-23 October 2024. 2) Noppalit S., Simula A., Ballard N., Callies X., Asua J.M., Billon L. Renewable Terpene Derivative as a Biosourced Elastomeric Building Block in the Design of Functional Acrylic Copolymers. Biomacromolecules 2019, 20, 6, 2241–225.3) Sadeghifar H., Raguaskas A. Lignin as a UV Light Blocker—A Review. Polymers 2020, 12(5), 134; https://doi.org/10.3390/polym12051134

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