Preventive method against exudation of wood resin by chemical conversion

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(1) Prevention of resin exudation and light-induced discoloration in woodA treatment with semicarbazide prevented resin exudation in the woods of kuro-matsu, Japanese larch and Siberian larch as well as Douglas fir wood. This treatrment also prevented light-induced discoloration in Douglas fir and kuro-matsu woods, but accelerate it in the woos of both larches.(2) Inpregnation of chemicals into woodIn regard to impregnation into Douglas fir wood, it was found that 1) a stage of decoimpression before pressurization was effective, 2) it was more effective that pressure under 1 Kg/cm2 per minute was added on the process of pressurization, 3) maximum pressure above 13 Kg/ c, -. 92 was necessary, 4) the optimum moisture content in the wood was 17%.(3) Changes of resin components during a treatment with semicarbazideDuring a semicarbazide treatment, it was found that a part of resin components was dissolved in a semicarbazide solution or converted to n-hexane insolubles, and 1.48 - 0.59% of nitrogen was introduced into the residual resin coriponents to increase the viscosity of it.(4) Painting of the wood treated with semicarbazideThe Douglas fir wood treated with seiaicarbazide did not have the troubles in painting, and not decrease the effect of prevenntion against light-induced discoloration.(5) Adhesive property of the wood treated with semicarbazideIt was found that the Douglas fir wood treated with semicarbazide did not obstruct the ability of vinyl acetate resin adhesives.