Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
  • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
  • B27K3/52—Impregnating agents containing mixtures of inorganic and organic compounds
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
  • B27K2240/00—Purpose of the treatment
  • B27K2240/70—Hydrophobation treatment
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
  • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
  • B27K3/16—Inorganic impregnating agents
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
  • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
  • B27K3/34—Organic impregnating agents
  • B27K3/36—Aliphatic compounds

Definitions

• the evaporation rate of corrosive substances is about 5 to 10 times higher than that of natural wood.
• the substances used to catalyze the synthetic resins play a decisive role.
• the often used salts e.g. B. Ammonium chloride can have a very corrosive effect.
• DE-OS 35 36 417 shows a process for the production of undensified plywood which contains a wood preservative against insecticides and fungicides by means of an aqueous solution.
• DD-PS 21 778 describes a process which makes wood water-repellent by treatment with hard paraffin.
• the invention has for its object to ensure protection of steel surfaces against rust and corrosion that are triggered by wood constituents, d. that is, an appropriate impregnation of wood products is intended to achieve a corrosion bond. At the same time, the wood should be protected against the ingress of moisture. Furthermore, a substance must be found that reacts with formaldehyde and makes it harmless.
• the solution to the problem is according to claim 1 to use a basic substance which sets the acids to such a high degree that the acids which have not yet formed can also be eliminated.
• Amine additives break down the formaldehyde content. Resins and waxes prevent water from entering again. To a certain extent, a vapor barrier is installed that suppresses water from entering wood. To meet these requirements, the woods are best immersed in a dip and then subjected to a dry treatment in the oven.
• the wood or the wood products are so long z. B. subjected to immersion impregnation for 30 to 60 seconds. The time in the immersion bath also determines the depth of penetration.
• the impregnation solution penetrates the wood skeleton via the fibers and intercellular spaces. The individual particles are enclosed in wood products. At the same time, every fiber and every particle is coated with a hydrophobic layer that prevents water from penetrating again.
• the substances in the wood are thus neutralized and set, and finally the material is sealed for safety reasons. This is particularly important when the wood is to be used several times.
• the coloring has another advantage, namely that the quality of the sawn timber can be checked for penetration depth of the impregnation solution.
• Example 1 2% by weight sodium tetraborate 8% by weight of triethanolamine 5% by weight of triethanolamine stearate 1% by weight paraffin 1% by weight thickener 0.1% wetting and anti-foaming agent 82.9% by weight water
• This recipe contains paraffin.
• paraffin requires a certain emulsifier, triethanolamine stearate must also be added.
• the alkalinity is produced by the sodium tetraborate, whereby the triethanolamine reacts with the formaldehyde present in the wood. A very good impregnation solution that builds up excellent long-term protection.
• Example 2 5% by weight di-potassium hydrogen phosphate 3% by weight monoethanolamine 5% by weight polyethylene wax dispersion 0.2% by weight thickener 0.05% by weight wetting agent 86.75% by weight of water
• Example 3 8% by weight sodium silicate 5% by weight diethanolamine 10% by weight acrylic dispersion 0.2% by weight thickener 0.1% wetting and anti-foaming agent 76.7% by weight water
• different amines are used in the three aforementioned formulations, but their effects are all approximately the same. The only difference is the different steam pressures. In the true sense, a long-distance effect is generated by the amines, with the monoethanolamine having the greatest long-distance effect.
• the penetration depth of the impregnation solution can generally be controlled with the thickener.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Inorganic Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Chemical And Physical Treatments For Wood And The Like (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=6377965

Family Applications (1)

Country Status (2)

Families Citing this family (6)

Family Cites Families (4)

• 1989
  • 1989-04-06 DE DE19893911091 patent/DE3911091A1/de active Granted
• 1990
  • 1990-03-21 EP EP19900105320 patent/EP0391136A3/fr not_active Withdrawn

Also Published As

Similar Documents

Legal Events