Method of impregnating wood with corrosive sublimate

摘要

363,760. Preserving wood. BUBLA, K., 57, Kopernikova, Pilsen, Czecho-Slovakia. Oct. 21, 1930, No. 31615. [Class 140.] A method for preserving wood by impregnation with mercuric chloride consists in the use, either before or at the same time as impregnation with mercuric chloride, of solutions of salts of alkali or alkaline earth metals, salts of aluminium or ammonium, or esters of inorganic acids, which themselves have no preservative effect but which diminish the effect of the wood in fixing the mercury salt and hindering its penetration. Chlorinated derivatives of the aliphatic or alicyclic series may also be used, and substances having an acid reaction may be added, such as acetic acid. The wood may be treated prior to impregnation with mercuric chloride with one or more of the substances specified, either by impregnation or by passing vapours of the substances over the wood. Several of the substances may be used in succession. When materials having considerable affinity for the constituents of the wood which absorb the mercury salt are used, for instance, aluminium salts, they may be mixed with the mercury salt solution. In examples : (I) Wood is first dipped into a warm solution of aluninium sulphate and acetic acid, and then treated with mercuric chloride in the usual way. (2) Wood is treated with a solution containing both mercuric chloride and the materials specified in example (1). (3) Wood is exposed for 15 minutes to vacuum, treated for several hours with vapours of diethyl sulphate and hydrochloric acid, and then impregnated with a solution of mercuric chloride and ammonium chloride.