Wood impregnants

The fumes of zinc chloride are highly toxic and can damage mucous membranes and cause pale gray cyanation. It can also ulcerate the skin of workers using it as a soldering flux or those handling wood impregnated with it (59). 

A number of manufacturers offer wood impregnated to resist acids or alkahes or the effects of high temperatures. 

The macroazoinimer obtained by the end capping reaction of polyazoester with a diizocyanate and hy-droxyethyl methacrylate was used in wood impregnation leading to the one-shot polymerization of styrene thermally [50]. 

This process uses a thermal treatment of wood impregnated with a chemically modified vegetable oil. It is claimed that wood treated using this process does not exhibit the usual reduction in mechanical properties associated with a thermal treatment. This process is at a pre-commercial pilot stage at the time of writing. 

Matsuda, H., Murakami, K. and Ueda, M. (1988a). Oligoesterifed woods based upon anhydride and epoxide III. Preparation and dimensional stability of ohgoesterified woods by heating wood impregnated with anhydride-epoxide solution. Mokuzai Gakkaishi, 34(10), 844—850. 

Murakami, K. and Matsuda, H. (1989a). Oligoesterified woods based on anhydride and epoxide V. Properties of oligoesterified woods obtained by heating-suction of wood impregnated with reactants solution. Mokuzai Gakkaishi, 35(4), 328-335. 

Rapp, A.O. and Peek, R.D. (1995). New principles for the protection of wood impregnation with waterborne resins. International Research Group on Wood Preservation, Doc. No. IRGAVP 95A0047. 

Wood impregnated with No-wear high-performance Polymerization by... 

Wood impregnated with acrylic and methacrylic monomers Polyolefins... 

Wood. Wood impregnated with solutions of the nitrite over a long period will burn fiercely if accidentally ignited.12... 

Burr, H. K., and Stamm, A. J., "Comparison of Commercial Water-Soluble Phenol-Formaldehyde Resinoids for Wood Impregnation", U. S. For. Prod. Lab.Mimeo T384 (1943). 

Dumonceaud O., Thomas R. Process and apparatus for wood impregnation. French patent FR 2870773 (2004) and www.oleobois.com... 

Figure 8 Relationship between swelling and pH for succinylated wood impregnated with solution at various pH values. AT, Dimensional change in tangential direction , untreated wood O, succinylated wood. (From Ref. 29.)...

Very hard coatings may be obtained by irradiation of polymerized varnishes on wood or metals. Irradiation of wood impregnated with a monomer leads to waterproof products of high stability and hardness. Similarly to these wood-polymer combinations, concrete-polymer combinations can also be produced that exhibit high resistivity in water, particularly in seawater. 

Tlie heavy metals are collected with the char and the liquid bio-oil contains only traces of metals. The real samples show the same behaviour as those prepared in the laboratory. Fast pyrolysis of wood impregnated with A1 and Cu complexes gave similar results aluminum and copper are predominantly found in the char fraction. 

Table 3 Metal-organic complexes used for wood impregnation. 

Chou C.K, Chandler J.A. and Preston R.D, (1973) Microdistribution of metal elements in wood impregnated with a copper-chrome-arsenic preservative as determined by analytical electron microscopy. Wood Sci. Technol., 7, 151-160. 

In pine wood impregnated with water according to EN 113, pores with r > 2.1 nm are practically absent, and the filling of the pores proceeds without the capillary condensation, which is testified by the linearity of the comparative desorption-adsorption plots. 

As a result of the blowing (EN 73) of pine wood impregnated with oil. no dramatic changes in the sorption properties and structure are observed (Table 4) only a minor increase in A occurs, and the surface becomes more hydrophilic as a result of the weathering of more volatile hydrocarbon components of oil. 

From the above mentioned data it follows that the destructing action of microorganisms on wood impregnated with pyrolysis oils in the case of L. lepideus is almost twice as intensive as in the case of C. puteana. According to comparative plots, both cultures cause some decrease in the volume of the wider pores Fig. 2,A). However, in the case of L. lepideus, in, contrast to C puteana, a minor volume of pores in the radial range 1.5-2.1 nm appears. 

Workers in aluminum production, coal gasification, coke production, iron and steel foundries, tar distillation, shale oil extraction, wood impregnation, roofing, road paving, carbon black production, carbon electrode production, chimney sweeping, and calcium carbide production are all exposed to PAHs and are known to have increased rates of lung cancer relative to the general population. I89 90 ... 

Use Synthetic intermediate, catalyst in ammonium nitrate propellants, wood impregnating solutions. See barbiturate. 

Huang L-H, Qin T-F, and Ohira Tatsuro (2004) Studies on preparations and analysis of essential oil from Chinese fir. Journal of Forestry Research, 75(1) 80-2 Hudson MS and Henrrksson ST (1956) The oscillation pressure method of wood impregnation. Forest Products Journal, 6(10) 381-6 Hughes C (1982) The natural durability of untreated timbers. What s New in Forest Research No. 112. New Zealand Ministry of Forestry, Forest Research Institute, Rotorua Humphrey PE and Bolton AJ (1989) The hot pressing of dry-formed wood-hased composites. Part 2 A simulation model for heat and moisture transfer, and typical results. Holzforschung, 43 T) 199-206... 

TWO organometallic polymers previously developed, tributyl-tin methaczylate/methyl methacrylate copolymer (TBTM/MeM) and the tributyltin ester of methyl vinyl ether/maleic anhydride (TBT-MVEt-MAn), were selected for use as wood impregnants. Full Cell and Enpty Cell Methods were used to treat wood with TBTCVMeM in "Rule 66" mineral spirits and in combination with P13 creosote. Although the polymers seem to be miscible with the creosote, this combination results in only surface penetration of wood when... 

The length of the polymer chain of these two organometallic polymers makes them rather viscous for use as wood impregnants, so it was decided to try impregnating with monomeric materials and polymerizing "in situ". Methyl methacrylate, trlbutyltin... 

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