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WO1988004601A1 - Agents de conservation du bois - Google Patents

Agents de conservation du bois Download PDF

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Publication number
WO1988004601A1
WO1988004601A1 PCT/GB1987/000914 GB8700914W WO8804601A1 WO 1988004601 A1 WO1988004601 A1 WO 1988004601A1 GB 8700914 W GB8700914 W GB 8700914W WO 8804601 A1 WO8804601 A1 WO 8804601A1
Authority
WO
WIPO (PCT)
Prior art keywords
ester
composition
wood
organic
alcohol
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/GB1987/000914
Other languages
English (en)
Inventor
Gerald Howell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Evonik LIL Ltd
Original Assignee
Laporte Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Laporte Industries Ltd filed Critical Laporte Industries Ltd
Publication of WO1988004601A1 publication Critical patent/WO1988004601A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B27K3/34—Organic impregnating agents
    • B27K3/36—Aliphatic 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
    • 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

Definitions

  • the present invention relates to the use of borates as preservatives, especially wood preservatives.
  • the boron rods, tablets and extrudates described above also suffer from the problem that they are reluctant to dissolve in the moisture present in the interior of sleepers when that moisture is below about 25% by weight of the sleeper. Decay can readily occur, however, at lower moisture contents and cannot be co batted satisfactorily by the aforementioned means.
  • boron-based rod, tablet, extrudate or other artefact suitable for insertion into timber which can be used effectively to treat wood having moisture contents below about 25% -by weight. It would also be of benefit to produce a boron-based composition in any form, for example in liquid form, which is effective in treating wood having the relatively low water contents last envisaged above.
  • a wood preservative composition comprising one or more boron compounds the composition being characterised by a content of one or more organic boron compounds preferably of one or more boric acid esters.
  • organic borate is used to indicate derivatives of a boric acid or of a boric oxide containing one or more organic groups and includes functional derivatives thereof. While metaboric acid derivatives are not excluded the present invention is primarily concerned with orthoboric acid derivatives.
  • the term 'ester' is used to indicate the compound which would be obtained by reactio between the boric acid and an organic hydroxy functional compound whether obtained by that reaction or by other routes, e.g. by reaction between boric oxide and the organi compound.
  • the last mentioned compounds are generally characterised by the binding of an organic group to the boron atom via a linking oxygen atom.
  • a wide range of organic borates may be prepared by a reaction between the boric acid and one or more mono- or poly- hydroxy organic compounds. According to the inventio such compounds may be particularly suited to the treatment of wood, particularly wood having a relatively low water content. On hydrolysis by contact with the moisture presen in the wood the active boric acid species is liberated and the mono- or poly- hydroxy compound regenerated. According to one aspect of the present invention the presence of the said hydroxy compound by reason of its water solubility and therefore its solubility in the ambient wood moisture helps to transport the said active species into the wood thereby producing an effective wood treatment system.
  • the rate of hydrolysis of organic borates is subject to a number of parameters amongst which are steric parameters, according to which the presence of groups of large steric requirement above and below the BO3 plane hinders hydrolysis, and electronic parameters, according to which substituents which can exert an inductive effect to decrease the electron density on the boron atom, for example halogen substituents, encourages hydrolysis.
  • steric parameters according to which the presence of groups of large steric requirement above and below the BO3 plane hinders hydrolysis
  • electronic parameters according to which substituents which can exert an inductive effect to decrease the electron density on the boron atom, for example halogen substituents, encourages hydrolysis.
  • substituents which can exert an inductive effect to decrease the electron density on the boron atom, for example halogen substituents encourages hydrolysis.
  • a borate is selected having an uncatalysed rate of hydrolysis at ambient temperature at least equal to, and preferably at least twice, that of tri 3-heptyl borate.
  • the last mentioned compound may be produced by.reaction between orthoboric acid and heptanol in the presence of an azeotroping agent for the water produced, such as benzene, xylene, toluene, 1-octene or diisobutylene, with removal of the azeotrope from the reactants by distillation.
  • the rate of hydrolysis may be determined by comparison of the time taken for a given proportion of the ester to hydrolyse in an aqueous or organoaqueous medium, a suitable proportion, for example, being from 25% to 50%.
  • Other boric acid esters considered herein may be produced by parallel techniques to that outlined above and known to those versed in the art of organo-boron chemistry.
  • the physical state of the borate is also of importance. If it is to be utilised in the form of a solid it clearly should be a solid at normal temperatures, and if it is to be used in the form of a liquid it is preferably a liquid at normal temperatures to avoid undue dilution of the active species because of the need to use a solvent. Borates produced using low molecular weight mono- alcohols such as, for example methanol or ethanol or other monohydric alcohols containing up to 10 carbon atoms tend to be liquid at normal ambient temperatures. The above borates are preferably tri substituted with the mono-alcohol residue.
  • borates based on simple monohydric alcohols are envisaged above, parallel methods and considerations apply to the selection for the purposes of this invention of aryl borates, arylalkyl.
  • borates and borates based on glycols an polyhydric alcohols Useful borates may particularly be produced by the use of glycols to form either an anhydride type of borate containing a single boron molecule, or, particularly preferably, biborates containing two boron atoms and three glycol residues which generally aresolids a ambient temperature. Alternatively, aromatic dihydroxy compounds may be employed.
  • the glycols contain to 10 carbon atoms for example hexylene glycol although the lower glycols for example ethylene glycol may be preferred on cost considerations.
  • Suitable polyhydric alcohols which may be employed in the production of borates for use according to the present invention are the trihydric alcohols such as glycerol, trimethylol ethane, tetrahydric alcohols such as pentaerythritol or higher polyhydric alcohols such as the sugar alcohols for example sorbitol or mannitol.
  • borates envisaged herein generally have boron contents, calculated as B2O3 of from about 10 to 35% weight.
  • a borate preferably has a melting point of from 40°C to 200°C particularly preferably of from 50°C to 150°C.
  • Such borates may be formed into rods or other solid artefacts by fusing or extruding although if decomposition is found to occur they may alternatively be moulded or tabletted using a binder, if necessary, without the need to heat to or near the melting point.
  • the final compositions of this invention cont at least 5% of boron (calculated as the element) to give a reasonably effective boric acid potential in use.
  • the organic borates dissolve with hydrolysis at moisture contents as low as 10%, unlike the known inorganic borates which tend to dissolve only when the moisture content reaches 20-25%.
  • This property allows effective pretreatment of the wood or other construction material instead of having the preservative only permeate the article with the influx of water.
  • the fact that organic borates can dissolve at such low moisture contents also means that infections developing elsewhere in the material can effectively be countered at a very early stage.
  • the alcohol used is that from which the organic moiety, or moieties, is or are derived and is present as a result of hydrolysis of the borate 'in situ' in the wood, and/or as a result of manufacture of the borate fro the alcohol.
  • Particularly preferred compounds for use in accordance with the present invention are trihexylene glycol biborate and trimethoxyborane. It will thus be appreciated that the said organic borate compound need not comprise only one borate moiety.
  • a particularly preferred embodiment of the present invention concerns railway sleepers.
  • An organic borate, tri(ethylene glycol) biborate (m pt circa 160°C), is fused and extruded to form a rod which, when solidified, is snapped or cut into short lengths of approximately 10 cm, the rod being about 2.5 cm in diameter.
  • These rods are then placed in snug-fitting holes bored in a sleeper, the holes being sufficiently deep to allow insertion of a tight-fitting cap to reduce exposure to excessive quantities of water.
  • rods for example 8 to 12 rods per sleeper, may be used and are spread evenly along the length of the sleeper conveniently in a zig-zag fashion to maximise the volume perfused. More rods may be required in areas of the sleep particularly prone to stress and/or absorption of water, f example near the plates under the rails.
  • boric acid distributes up to 50 mm from the point of insertion in wood containing only 10%- 12% by weight of moisture. In wood containing a higher moisture content the penetration is greater but this confirms the operability of the invention at minimum wood water content.
  • a further feature of this invention are that it is als possible to selectively control the rate of hydrolysis by a combination of various borate esters which will dissolve at predetermined rates.
  • inorganic borates can be combined ith organic borates by melting the latter, and blending in the inorganic borates to form a dispersion whic can, on solidification, be extruded to form solid wood preservative rods.
  • This will provide a solid rod with a fast dissolving fraction (organic borate) with a residual, more slowly dissolving content(inorganic borate) which will be extremely advantageous in the secondary treatment of wooden structures where a rapid distribution of preservativ is often required.
  • the present invention is useful particularly where there is a danger of attack by insects, fungi and other infestations generally susceptible to the well-known toxic effects of borates.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

Des composés de bore organiques, ayant le pouvoir de provoquer une hydrolyse lors de leur utilisation, en particulier des esters d'acide orthoborique, tels que des boranes de méthoxy ou d'éthoxy ou les monoboranes ou les biboranes de glycols tels que l'éthylène glycol ou l'hexylène glycol, sont utilisés comme agents de conservation du bois, l'alcool qui est libéré lors de l'hydrolyse ou qui est présent comme composant résultant de la fabrication servant d'aide à l'absorption. Cette technique peut notamment s'appliquer à la conservation des traverses en bois utilisées dans les voies de chemin de fer.
PCT/GB1987/000914 1986-12-19 1987-12-21 Agents de conservation du bois Ceased WO1988004601A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB868630352A GB8630352D0 (en) 1986-12-19 1986-12-19 Preservatives
GB8630352 1986-12-19

Publications (1)

Publication Number Publication Date
WO1988004601A1 true WO1988004601A1 (fr) 1988-06-30

Family

ID=10609270

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1987/000914 Ceased WO1988004601A1 (fr) 1986-12-19 1987-12-21 Agents de conservation du bois

Country Status (3)

Country Link
AU (1) AU1059888A (fr)
GB (1) GB8630352D0 (fr)
WO (1) WO1988004601A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989003287A1 (fr) * 1987-10-13 1989-04-20 Manchem Limited Element de protection contenant des composes de bore organique et leur utilisation
EP0514331A3 (en) * 1991-05-12 1992-12-30 Acima, Aktiengesellschaft Fuer Chemische Industrie Im Ochsensand Wood preservative
WO1995005081A1 (fr) * 1993-08-19 1995-02-23 U.S. Borax Inc. Compositions biocides contenant des composes organobores
DE19650438A1 (de) * 1996-12-05 1998-06-10 Henkel Kgaa Verwendung von Borsäureestern zum Hydrophobieren von Holz
WO2002102560A1 (fr) * 2001-06-15 2002-12-27 The University Of Melbourne Conservateurs de bois a base de bore et traitement du bois avec ces conservateurs
WO2007055601A1 (fr) 2005-11-10 2007-05-18 Ivan Laurence Stanimiroff Traitement du bois

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US334262A (en) * 1886-01-12 Machine for dressing grinding-rolls
US4076871A (en) * 1976-11-02 1978-02-28 Masonite Corporation Method of impregnating wood with boric acid
GB2008640A (en) * 1977-11-11 1979-06-06 Wood Slimp Gmbh Timber Preservative Element and Use Thereof
GB1560884A (en) * 1976-06-23 1980-02-13 Basf Ag Preservation of wood and wood preservative therefor
EP0152976A2 (fr) * 1984-02-03 1985-08-28 Nederlandse Organisatie voor toegepast-natuurwetenschappelijk onderzoek TNO Composition et procédé pour la conservation du bois

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US334262A (en) * 1886-01-12 Machine for dressing grinding-rolls
GB1560884A (en) * 1976-06-23 1980-02-13 Basf Ag Preservation of wood and wood preservative therefor
US4076871A (en) * 1976-11-02 1978-02-28 Masonite Corporation Method of impregnating wood with boric acid
GB2008640A (en) * 1977-11-11 1979-06-06 Wood Slimp Gmbh Timber Preservative Element and Use Thereof
EP0152976A2 (fr) * 1984-02-03 1985-08-28 Nederlandse Organisatie voor toegepast-natuurwetenschappelijk onderzoek TNO Composition et procédé pour la conservation du bois

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989003287A1 (fr) * 1987-10-13 1989-04-20 Manchem Limited Element de protection contenant des composes de bore organique et leur utilisation
EP0514331A3 (en) * 1991-05-12 1992-12-30 Acima, Aktiengesellschaft Fuer Chemische Industrie Im Ochsensand Wood preservative
WO1995005081A1 (fr) * 1993-08-19 1995-02-23 U.S. Borax Inc. Compositions biocides contenant des composes organobores
DE19650438A1 (de) * 1996-12-05 1998-06-10 Henkel Kgaa Verwendung von Borsäureestern zum Hydrophobieren von Holz
WO1998024603A1 (fr) * 1996-12-05 1998-06-11 Henkel Kommanditgesellschaft Auf Aktien Utilisation de triesters d'acide borique pour impermeabiliser du bois
WO2002102560A1 (fr) * 2001-06-15 2002-12-27 The University Of Melbourne Conservateurs de bois a base de bore et traitement du bois avec ces conservateurs
WO2007055601A1 (fr) 2005-11-10 2007-05-18 Ivan Laurence Stanimiroff Traitement du bois
AU2006312410B2 (en) * 2005-11-10 2010-10-28 Ivan Laurence Stanimiroff Wood treatment

Also Published As

Publication number Publication date
AU1059888A (en) 1988-07-15
GB8630352D0 (en) 1987-01-28

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