| 摘要 |
<p>1465214 Proofing wood against iron staining during transport KOPPERS CO INC 31 May 1974 [12 June 1973] 24326/74 Heading D1P Wood is treated to prevent iron stain during transport with a dispersion of particles of an insoluble salt of Be, Mg, Ca, Sr, Ba, Zn, Cd or Hg. Iron staining is caused by contact with particles of iron and assisted by atmospheric moisture. It is a particular problem in transporting wood by rail. The anion of the salt may be oxide, hydroxide, carbonate, borate, silicate, chromate or phosphate. The liquid may be water, alcohol, paraffin oil, mineral spirits or a mixture of water and mineral spirits. Preferably the particles are not greater than one micron in size and comprise 0.1 to 20% by weight of the composition. The composition may also comprise a water repellent, e.g. paraffin wax and a pentaerythritol ester of a mixture of 75% Rosin acids and 25% Tall oil fatty acids, a fungicide, e.g. pentachlorophenol (zinc oxide is a fungicide as well as an iron stain inhibitor) and a dispersing agent, e.g. sodium lignosulphate, a sodium salt of a condensed arylsulphonic acid or sodium gluconate, and a pigment. The dispersion may be applied by spraying brushing or dipping at a rate of 1 to 6 gallons per 1000 ft<SP>2</SP> of wood surface.</p> |
