Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
  • B27N1/00—Pretreatment of moulding material
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31971—Of carbohydrate
  • Y10T428/31975—Of cellulosic next to another carbohydrate
  • Y10T428/31978—Cellulosic next to another cellulosic
  • Y10T428/31982—Wood or paper
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31971—Of carbohydrate
  • Y10T428/31975—Of cellulosic next to another carbohydrate
  • Y10T428/31978—Cellulosic next to another cellulosic
  • Y10T428/31986—Regenerated or modified
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31971—Of carbohydrate
  • Y10T428/31989—Of wood

Definitions

• the invention relates to a process for the production of wood-based materials, the use of thiacloprid for the protection of wood-based materials against insects and corresponding wood-based materials per se.
• the application of the protective agents can be carried out by a pre-manufacture treatment, in-process treatment and after the preparation of the wood-based material (post-manufacture treatment).
• temperatures up to 200 ° C may occur in the presence of alkaline substances (e.g., pH 11-13 in phenolic sizing). These process conditions affect the protective agent and can cause degradation of the protective agent. In alkaline medium, many insecticides, especially at elevated temperatures, are easily degraded.
• alkaline substances e.g., pH 11-13 in phenolic sizing
• Thiacloprid should be mentioned in the search for alternative insecticides that stand for high efficacy with an acceptable toxic profile. However, for in-process or pre-manufacture treatment, the property profile of thiacloprid under alkaline conditions is prohibitive.
• OSB Oriented Strand Boards
• a temperature of up to 200 ° C for example, not from the outer Sheets of a plywood is absorbed, but acts directly on the drug.
• WO98 / 18328 For example, the use of imidacloprid is found with pH neutral urea glue (see Example 5), but this does not exert much pressure on the active ingredient.
• the inventive method is particularly suitable for the production of Oriented Strand Boards (OSB, wood materials from long slender aligned chips), plywood (wood materials containing veneer or veneer sections that have broken by glue joints surface), fiberboard (wood materials with fibrous wood particles) or chipboard ( Wood materials from short chips).
• OSB Oriented Strand Boards
• plywood wood materials containing veneer or veneer sections that have broken by glue joints surface
• fiberboard wood materials with fibrous wood particles
• chipboard Wood materials from short chips.
• Preferred wood-based materials are OSBs, chipboard and fiberboard.
• Suitable alkaline binders a1) are solid or liquid binders, preferably as aqueous solutions or emulsions, in particular in an aqueous form having a binder content of from 10 to 60% by weight, preferably from 35 to 50% by weight. Preference is given in particular to those which have a pH of 10 to 13.5 in the form of a 35 to 50% strength by weight aqueous solution.
• the alkaline binder is preferably applied to the wood parts as an aqueous solution.
• the in-solution phenolic binders preferably contain oligomeric to polymeric chains.
• the binder used contains, preferably as a solution, in particular 1-13% by weight of alkali metal compounds, in particular sodium hydroxide.
• non-alkaline binders are possible.
• polymethylene diisocyanate PMDI
• UF urea glues
• mUF melamine-reinforced urea glues
• MF melamine glues
• MAF melamine-urea-formaldehyde glues
• MUF melamine-urea-phenol-formaldehyde Glues
• RF resorcinol-formaldehyde glues
• PVAc polyvinyl acetate glues
• OSBs used for pressing wooden parts-dumps or mats usually include a top and a bottom layer (cover layers) of coarser, equally treated wood parts and include at least one middle layer, possibly from finer wood parts.
• the middle layers may also preferably contain a non-alkaline binder or non-phenolic binder, for example a PMDI binder.
• large-volume drums are preferably used.
• the amount of glue and chemicals used varies according to plate quality, plate thickness and type of gluing.
• different types of glue can be used for the top and middle layers.
• PF phenol binder
• PAF phenol-urea-formaldehyde binder
• MUPF melamine-urea-phenol-formaldehyde
• MUF melamine-urea-formaldehyde
• PMDI Polymethylene diisocyanate
• Thiacloprid is preferably applied to the wood parts as an aqueous solution containing from 0.2 to 10% by weight, in particular from 0.2 to 2% by weight, of active ingredient. Thiacloprid can also be added to the binder.
• extenders and fillers for influencing the bonding and the processability of the wood-based material, water repellents, fire and fire retardants and dyes but also other biocides such as insecticides and / or fungicides can be used. Their job can be done in the same way as the order of the alkaline binder or the insecticide.
• extenders and fillers are organic flours of cereals and lignocellulosic materials or inorganic flours.
• water repellents are oils and / or waxes, such as, for example, paraffins in solid form or as dispersion.
• fire and fire retardants are e.g. Boric acid, aluminum hydroxide, ammonium polyphosphates and mono- and Diammoiumphosphat.
• binders than the alkaline binders may be used to bring the wood parts into contact with any middle layers that may have been used.
• the same protective agent insecticide
• the bedding is generally scattered to a mat of the wood parts.
• OSB this is particularly preferred with optimum orientation of the strands.
• From Streumaschinenbunkern reach the treated after step a) beach preferably via discharge and distribution to the scattering heads provided with orienting devices.
• the orientation of the cover layer in the production direction preferably takes place with the aid of disk orientators, the orientation of the middle layer preferably in the transverse direction via fan rollers. Both the weight of the spread mat and the proportions of topcoat to middlecoat can be controlled via scales.
• the mat is preferably sprinkled onto a circulating textile belt. From this band can then take place the transfer of the mat on the steel strip of a press.
• the mat When multi-level presses are used, the mat can be spread on rotating screen sections that match the pickling plate length of the press. By cross-sawing the mat in the region of the transitions is made possible that they are introduced individually in the feeder of the press. A continuously movable side trimming of the mat allows the production of different plate widths.
• step b) of the process according to the invention the binder is cured in the press under the action of pressure and temperature, and the mat is pressed to the predetermined thickness.
• two press types are mainly used: multi-day presses and continuous presses.
• the preferred pressures during pressing are generally 100 to 500 N! Cm 2 .
• the preferred temperature is preferably 126 to 210 ° C, especially 150 to 200 ° C.
• the residence time in the press is usually 4 to 15 seconds per mm of wood material thickness (plate thickness).
• the invention further relates to the use of thiacloprid for the protection of wooden parts containing wood parts against attack and / or degradation by insects, in particular termites, characterized in that the wood materials contain alkaline binder. For the rest, the above-mentioned preferred areas apply.
• the invention further relates to a wood material containing wood parts, containing at least one alkaline binder and thiacloprid-containing wood parts.
• Pine chips (strands for the production of OSB) whose fines ⁇ 6mm were removed by sieving were used for the overcoats with phenol-formaldehyde glue (PF, manufacturer Georgia Pacific, type GP 155 C 42, pH ca 11-13) and for the middle class with. Polymethylene diisocyanate glue (PMDI, manufacturer Bayer, type Desmodur 1520 A 20) wetted.
• the respective treated topcoat and middlecoat chips were then wetted in each case with an aqueous solution containing 0.5% thiacloprid and finally each with a wax emulsion (Sasolwax Hydrowax 730). The order was carried out in each case with a spinning disk atomizer in a chip mixer.
• the amount of alkaline binder was 4.5% PF (or 2.5% PMDI) solid resin mass fraction in the finished OSB board. This corresponds to about 10% by weight of the PF glue, based on the chips used.
• the aqueous solution containing thiacloprid was used with 2000 ml / m 3 finished OSB plate. At a density of 650 kg / m 3, this corresponds to 0.00153% thiacloprid, based on the finished OSB board.
• the wax content was 0.8% by weight based on the OSB board.
• the OSB wood composites produced were made from 60% PF-glued chips as cover layers and 40% PMDI-glued chips as the middle layer in a 500N / cm 2 press and press plate temperatures of 190-200 ° C.
• the finished panels had a density between 650 and 680 kg / m 3 and a thickness of 11-12 mm.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Chemical And Physical Treatments For Wood And The Like (AREA)
• Dry Formation Of Fiberboard And The Like (AREA)
• Building Environments (AREA)
• Agricultural Chemicals And Associated Chemicals (AREA)
• Catching Or Destruction (AREA)

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• 2008
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• 2009
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  • 2009-04-20 MX MX2009004176A patent/MX2009004176A/es active IP Right Grant
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  • 2009-05-06 EP EP20090159546 patent/EP2116346A1/de not_active Withdrawn
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