ABSTRACT

Novel approaches for a non-toxic protection of timber have been investigated and referred to as “wood modification”. Especially, chemical impregnation modifications show promising opportunities to improve a wide range of wood properties. Yet, most of the available treatments resort to technically synthesized oil-based chemicals. Therefore, new ways of wood modification based on citric acid (CA) and bio-based low-molecular-weight polyols (CA-PO) – both originating from renewable resources – are under test and appear to be a promising alternative to available processes. The mode of action is expected to be a combination of both a cell wall bulking, and a cross-linking between CA-PO polyesters and wood cell wall polymers. However, the treatment process requires optimization with regard to the impregnation system and parameters for an industrial scale implementation. This paper provides a general background about CA-based solid wood treatment and its effects on the characteristics of wood. Moreover, it discusses current developments in this area and points out existing research gaps, with one focus being the process of development on an industrial scale.

摘要

已经研究了用于木材无毒保护的新方法，并将其称为“木材改性”。特别是，化学浸渍改性显示出改善各种木材性能的有希望的机会。然而，大多数可用的治疗方法都是采用技术合成的油基化学品。因此，基于柠檬酸 (CA) 和生物基低分子量多元醇 (CA-PO) 的木材改性新方法——均源自可再生资源——正在接受测试，并且似乎是一种很有前途的替代现有工艺的方法。预期作用方式是细胞壁膨胀和 CA-PO 聚酯与木材细胞壁聚合物之间的交联的组合。然而，处理过程需要优化浸渍系统和工业规模实施的参数。本文概述了基于 CA 的实木处理及其对木材特性的影响的一般背景。此外，它讨论了这一领域的当前发展并指出了现有的研究差距，其中一个重点是工业规模的发展过程。