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Home  > Raw materials & technologies  > Applications  > Protective & Marine coatings  > Preserving wood with sol-gel technology

Sunday, 15 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Preserving wood with sol-gel technology

Friday, 19 October 2012

Wood needs protection especially against fungis. A novel inorganic-organic hybrid copolymer was investigated with a new sol-gel method.

A new copolymer works as a biocide.

Source: BASF AG

A new copolymer works as a biocide.

Source: BASF AG

Simona Maggini, Università degli Studi di TrentoItaly and her colleagues therefore investigated a novel inorganic–organic hybrid copolymers based on vinyl- or (3-mercaptopropyl)-trimethoxysilane and an organically modified zirconium-oxocluster as a wood preservation treatment.

A modified sol-gel technology used

They prepared the copolymers by using a modified sol-gel strategy - not involving alkoxysilane pre-hydrolysis. Maggani post-functionalised the copolymer obtained from (3-mercaptopropyl)trimethoxysilane with the methacrylic ester of thymol. 

This was interesting for testing as a biocide. Preliminary accelerated biological tests against the brown rot fungus Coniophora puteana, showed resistance to the fungus for the samples coated with the vinyltrimethoxysilane copolymer, while uneven results were obtained for the samples coated with the (3-mercaptopropyl)trimethoxysilane copolymer, even when functionalized with the ester of thymol.

Although a surface treatment the cell walls got pretection as well

Via dip coating the researchers applicated the treatment. Even though the copolymers were mainly present on the surface of the wood, EDX analysis showed also a uniform distribution of silicon and zirconium in the cell wall but not in the lumina.
FTIR, 13C and 29Si MAS NMR analysis confirmed the grafting of the copolymers.

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