Development of modifying wood compositions based on by-products of polybutadiene and methyl methacrylate production

New compositions for the treatment of natural wood based on by-products of the production of polybutadiene and methyl methacrylate have been developed. Used for the preparation of the impregnating composition by-products of the production of polybutadiene had the following composition, wt %: 4-vinylcyclohexene – 36.4; toluene – 45.6; heavy residue (butadiene trimers and other products) – 18. Methyl methacrylate was obtained by destruction of polymethyl methacrylate, carried out at a temperature of 220 C. Pinane hydroperoxide was used as a radical initiator. The resulting oligomeric product in all cases had an increased content of methyl methacrylate units. The dosage of methyl methacrylate also affects the molecular weight of the obtained oligomers, which increased with an increase in the content of methyl methacrylate in the initial monomer mixture. The prepared oligomeric solutions after the introduction of the desiccant (4-6% per oligomer) were used for the manufacture of wood-polymer composites. The introduction of the resulting oligomers into samples of natural wood was carried out by immersing them in a toluene solution and kept at a given temperature (20, 60 and 100 C) for 10 hours. The impregnated wood samples were placed in a chamber for high-temperature treatment at a temperature of 160 ± 2 0С for 5 hours. The oligomer content in the prepared woodpolymer composite varied from 10 to 20% and depended on the temperature of the impregnating composition. The wood-polymer composites obtained with the content of methyl methacrylate in the initial monomer mixture of 30% wt and impregnating composition temperature of 100 C have the best performance. It is shown that the treatment of birch wood with an oligomer from by-products of polybutadiene production makes it possible to improve such properties of wood as water absorption, swelling in the tangential and radial directions.

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