Rosin was reacted with diethyltriamine (DETA) after being modified by acryl acid with the weight ratio of 4.5:1 and a rosin amide (RA) derivative was produced at the conditions as follows: modified rosin and DETA mole ratio of 1:3.5, dimethylbenzene as water carrying agent, reaction temperature of 160-180°C, and reaction time of 8h. The chemical structure of the product as RA was identified by FTIR and MS analysis. The anti fungal activity of its derivative was determined by paper-disc method with wood decay fungi such as Coriolus versicolor, Gloeophyllum trabeum, Aspergillus niger and Paecilomyces variot Bainier. The anti-fungal experiment results signified that the derivative is active to these fungi, especially Paecilomyces variot Bainier. Since it is produced easily from rosin, which is renewable and not expensive, RA could be a potential wood preservative. Further study is planning.

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