| 摘要 |
<p>The invention relates to a composition for protecting wood against quick drying and for the impermeabilization and waterproofing of agglomerated plates made of chips and fibres and to the process for preparing the same. According to the invention, the composition comprises paraffin having a dropping point ranging between 40 and 60A C, and a content of oil ranging between 1 ... 40 %, stearic acid in a ratio of 5 ...15% relative to the paraffin, oleic diethanolamine in a ratio of 2 ... 12% relative to the paraffin, a fatty alcohol having a C16-C18 alkyl chain ethoxylated with 20 mols of ethylene oxide in a ratio of 5 ... 15% relative to the paraffin and a stabilizer consisting of an aqueous solution of aluminium sulphate or boron hydroxide having a concentration of 5% and having a ratio of 50...70 % relative to the paraffin. According to the invention, the process consists in mixing while stirring the paraffin and the stearic acid, the oleic diethanolamine and the fatty alcohol having a C16-C18 alkyl chain ethoxylated with 20 mols of ethylene oxide , heating the resulting homogenous mixture up to 70...80A C, adding said mixture while stirring onto the aqueous solution of aluminium sulphate or boron hydroxide having a concentration of 5% and a temperature of 70 ... 80% , followed by reducing the temperature of the resulting emulsion, down to a temperature lower than the dropping point of the paraffin.</p> |
