Wood Protection with Dimethyloldihydroxy-Ethyleneurea and Its Derivatives

The cross-linking reagent DMDHEU (dimethyloldihydroxy-ethyleneurea) and its derivatives were used to chemically modify wood. The mode of action is based on DMDHEU cross-linking with the wood compounds and self-polymerization within the cell wall. The modified material is a polymer composite with the appearance and texture of solid wood. The impregnation causes a permanent bulking of the cell wall and reduces the swelling and shrinkage properties, with the dimensional stability thus considerably increased. This is reflected by an improved anti shrink efficiency (ASE) of up to 70 %. In addition, high durability against white, brown and soft rot fungi are obtained. The treatments also enhance the wood's surface hardness and weathering properties.

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