WO1995027600A1 - Agent preservateur pour le bois, solutions de traitement et utilisation de cet agent - Google Patents

Agent preservateur pour le bois, solutions de traitement et utilisation de cet agent Download PDF

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Publication number
WO1995027600A1
WO1995027600A1 PCT/DK1995/000140 DK9500140W WO9527600A1 WO 1995027600 A1 WO1995027600 A1 WO 1995027600A1 DK 9500140 W DK9500140 W DK 9500140W WO 9527600 A1 WO9527600 A1 WO 9527600A1
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WO
WIPO (PCT)
Prior art keywords
weight
copper
nitrite
calculated
preservative
Prior art date
Application number
PCT/DK1995/000140
Other languages
English (en)
Inventor
Arne Smith-Hansen
Original Assignee
Smith Hansen Arne
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 Smith Hansen Arne filed Critical Smith Hansen Arne
Priority to AU23034/95A priority Critical patent/AU2303495A/en
Publication of WO1995027600A1 publication Critical patent/WO1995027600A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
    • A01N25/22—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing ingredients stabilising the active ingredients
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N33/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic nitrogen compounds
    • A01N33/02—Amines; Quaternary ammonium compounds
    • A01N33/12—Quaternary ammonium compounds
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
    • A01N59/16—Heavy metals; Compounds thereof
    • A01N59/20—Copper
    • 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
    • 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
    • B27K3/20—Compounds of alkali metals or ammonium
    • 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
    • B27K3/22—Compounds of zinc or copper
    • 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 copper compound is preferably copperoxid, copperhydroxid or copper carbonate
  • the alifatic carboxylic acid is preferably 2-ethylhexanoic acid or isooctanoic acid
  • the polyamine is preferably 1,3-diaminopropane.
  • preservatives give good protection of the wood, they all have to a more or less degree the disadvantage, that you have a high degree of leaching of the metals from the treated wood, as the metals are not fixed to the wood, but exist in the wood as a precipitated metal salt.
  • a compound with anions is mentioned thiocyanate and iodide.
  • the preservative may contain a reduction chemical, which assists in the reduction of the copper-II-compound to the copper-I-compound.
  • a reduction chemical is mentioned glucose.
  • the preservative has a low copper content from about 7-11.5 % and so it will have to be used in a high concentration. Further the preservative contains amines, which to day many peoples call in question from environmental reasons. Also in this preservative the copper is not fixed to the wood, but precipitated as a copper compound.
  • WO 91/11306 states, that you per one mole of the catione have to use at least four moles of a complexing agent, it means minimum 80 per cent by weight calculated on the metal salt. As the complexing agent keeps the metal in a soluble form you have to use more nitrite to achieve the same degree of fixation as without the complexing agent, compare page 5-6 and page 18-19.
  • the preservative may, for restraining of the corrosion on the treating plant, contain alkali- or ammonium nitrite or alkali- or ammonium acetatate in an amount up to 0.1 %. by weight of the treating solution.
  • Acid copper salts is even in low concentrations, it means less than 2 %, strong corrosive against iron and steel and for that reason it cannot be used in practice without addition of aid compounds, which neutralize the corrosive effect.
  • These fungies are called copper-tolerante fungies. To protect against decomposition caused by these fungies an unacceptable high copper loading in the wood is needed. Therefore, the preservative must in environments, where these fungis are found, be added a compound which ensures, that the wood is protected in these cases.
  • the present invention relates to a prservative for treating of wood, wood-based products or similar organic fibre products, which include one or more copper salts and perhaps zinc salts of weak organic acids, a stabilising chemical selected among the ammoniumsalt of a weak organic acid or a mixture of such an ammonium salt and an alkalimetal salt of a weak organic acid, nitrite plus perhaps further admixture - and/or aid chemicals characterised by containing 0.1-1.0 parts by weight of nitrite, calculated as sodium nitrite per 1.0 parts by weight of copper salt and perhaps zinc salts calculated as copper acetate.
  • the preservative in the treating solution has a pH-value of 5.2-6.2 and the amount of nitrite calculated as sodium nitrite comes to at least 0.15 % by weight of the treating solution and the stabilizing chemical is found in an amount of at least 0.2 % by weight calculated as ammoniumacetat of the treating solution, where the concentration of the ammonium salt calculated as ammoniumacetate must not exceed ,
  • a. is the concentration of nitrite calculated as sodium nitrite in per cent of the treating solution and where the nitrite exists in one packing unit divided from an other packing unit containing the remaining chemicals.
  • the copper salt is selected among copper formate, copper acetate and copper propionate or a mixture of these and that the zinc salt, if it is present, is selected among zinc formate, zinc acetate and zinc propionate or a mixture of these.
  • the content of nitrite in the preservative has two functions.
  • the content causes, that the leaching of the copperions and the zincions from the treated wood is reduced essentially.
  • the copper salt is as mentioned preferably selected among copper formate, copper acetate and copper propionate or mixtures of these.
  • the copper salt is copper acetate.
  • the active ingredient in the preservative is as mentioned mainly the copper salt or a mixture of a coppersalt and a zinc salt, where the zinc salt comes to 25 % of this.
  • the amount of the remaining chemicals such as nitrite is adjusted according to the amount of the active ingredient, it is the amount of copper salt and perhaps zinc salt plus the degree of fixation which is wanted. However, the content of nitrite calculated as sodium nitrite must for the sake of protection against corrotion at least comes to 0.15 % by weight of the treating solution.
  • the amounts in this case is calculated from the molecular equivalence which corresponds to the corresponding amount of copper acetate.
  • the nitrite is selected among the alcalimetal nitrites, it is potassium- and sodium nitrite, ammonium nitrite or a mixture of these. Sodium nitrite is preferred.
  • the preservative according to the invention contains as mentioned a stabilising chemical selected among the ammonium salt of a weak organic acid or a mixture of such an ammonium salt and an alkalimetal salt of a weak organic acid in an amount of at least 0.2 % by weight calculated as ammonium acetate of the treating solution.
  • a stabilising chemical selected among the ammonium salt of a weak organic acid or a mixture of such an ammonium salt and an alkalimetal salt of a weak organic acid in an amount of at least 0.2 % by weight calculated as ammonium acetate of the treating solution.
  • a stabilising chemical selected among the ammonium salt of a weak organic acid or a mixture of such an ammonium salt and an alkalimetal salt of a weak organic acid in an amount of at least 0.2 % by weight calculated as ammonium acetate of the treating solution.
  • alkali metal salt is preferably used sodium acetate.
  • ammoniumsalt and in some cases also alkalimetal salt causes a stabilising of the treating solution by preventing precipitation of the usable chemicals and together with the nitrite it prevents corrosion of the treating plant. Further these added chemicals cause that the treated timber will have a more attractive and uniform colour.
  • the ammonium salt is the most effective of the mentioned stabilising chemi cals and, therefore, it is preferably used. However, at a high content of nitrite the tendendy to decomposition of the ammonium salt is increased and as a consequence some nitrogen may be generated. In these cases it is suitable to replace parts of the ammonium salt with the alkalimetal salt.
  • the concentration of the ammonium salt calculated as ammonium acetate must not exceed ,
  • a is the concentration of nitrite calculated as sodium nitrite in per cent by weight of the treating solution.
  • the necessary amount of the stabilizing chemical must at high nitrite content be supplemented by addition of the alkalimetal salt so that the total amount of the stabilizing chemical calculated as ammonium acetate comes to at least 0.2 % by weight calculated on the treating solution.
  • the preservative contains profitably boric acid in an amount until 30 % by weight, preferably until 15 % by weight, such as 1-10 % by weight calculated on the content of copper salt and perhaps zinc salt calculate as copper acetate.
  • the preservative has a pH-value of 5.2-6.2 preferably 5.5-6.1 and particularly preferred 5.8-6.1 which will increase the biocidal effect of the copper and ensure a good fixation.
  • the pH-value of the treating solution is relatively constant and only to a low degree dependent on the concentration of the nitrite and the ammonium salt.
  • the pH-value increases with increasing concentration of the nitrite in the treating solution and with decreasing total concentration of the treating solution.
  • the pH-value decreases with increasing concentration of ammoniumsalt and acid. If it is wanted you can add a weak organic acid as acetic acid for adjusting of the pH-value and for stabilising the treating solution, preferably most in an amount until 0.1 % by weight, calculated as acetic acid, of the treating solution.
  • the preservative can profitably contain a quaternary ammonium compound for instance in an amount of 15-25 % by weight calculated on the copper content.
  • Quaternary ammonium compounds have a wide biocidal effect and thus it is able to support the effect of the copper and perhaps the zinc.
  • the addition of the quaternary ammonium compound, for instance in an amount of 15-25 % by weight calculated on the copper content in the preservative is relevant when treating wood products for use in environments where copper tolerant fungies is present.
  • the quaternary ammonium compounds have a wide biocidal effect and thus they will support the effect of the copper and the zinc and more especially be effective against the copper tolerant fungies.
  • the preservative according to the invention has the following composition:
  • nitrite 6-33 % by weight of nitrite, calculated as sodium nitrite
  • boric acid 0-15 % by weight of boric acid, especially 1-10 % by weight of boric acid and 0-5 % by weight of a weak organic acid calculated as acetic acid.
  • the copper salt and perhaps the zinc salt plus the ammonium salt will exist in one from the nitrite separeted packing unit and shall be diluted with water and mixed just before use.
  • the preservative according to the invention can be based on the copper salt alone but if wanted it can contain up to 25 % by weight of zinc salt calculated on the total amount of copper salt and zinc salt.
  • the invention includes a treating solution which is characterised by containing 1-20 preferably 1-12 % by weight of the preservative according to the invention and 80-99, preferably 88-99 % by weight of water.
  • the coppersalt gives a good protection and it has a wide biocidal effect.
  • the preservative according to the invention can be used for many species and for many different purposes.
  • the copper salts have the advantage, that they fixe better to the wood compared to the zinc salts.
  • nitrite when adding a relatively small amount of nitrite, it is 0.1-1.0, preferably 0.15-0.80 parts by weight calculated as sodiumnitrite per 1 part by weight of the copper salt calculated as copperacetate, essentially reduces the leaching of the copper from the timber compared to the leaching from corresponding weak acid copperbased preservatives without or with a very low content of nitrite, it is such preservatives which is described in the mentioned SE number 466.094.
  • the nitrite also has the advantage, that it restrains the corrosion.
  • the preservative is particulary usable in treating plants.
  • the preservative contains additional ammonium and perhaps alkalimetal salts of weak organic acids in an amount of at least 0.2 % by weight, calculated as ammonium acetate, of the treating solution.
  • the content of ammonium - and perhaps alkalimetal salts in the mentioned amount is essential as the content causes a transformation of perhaps free copperions to cuprations at which the corrosive effect of the copperions to iron and steel disappear? at the same time as the solubility of the copper salt is essentially increased.
  • the amounts of the ammoniumsalt and perhaps the alkalimetal salt is calculated in every case from the molecular equivalent which corresponds to the corresponding amount of ammoniumacetate. If you use a mixture of for instance ammoniumacetate and sodiumacetate, it is not necessary to adjust in practice because of the small difference in molecular weight between these components when calculating the amount of sodiumacetate.
  • the ammonium salt is the most preferred stabilising chemical but at an increasing concentration of nitrite in the treating solution you will have a tendency to generate nitrogen because of a decomposition of the ammonium.
  • concentration of the ammonium salt calculated as ammonium acetate must not exceed in the treating solution where a. is the concentration of nitrite, calculated as sodium nitrite in per cent by weight of the treating solution.
  • the factor 0.07 is calculated on danish climate conditions and when used in more hot climates it may in practice be necessary to keep the amount lower than this maximum value as the tendency to generation of gas is increased with increasing temperature.
  • a corresponding phenomenon but with an opposite sign may be present when used in a more cold climate.
  • a concentration of ammonium salt calculated as per cent by weight of ammoniumacetate on where a is the concentration of nitrite, calculated as per cent by weight of sodium nitrite in the treating solution.
  • an alkalimetal salt is added, so the total amount of the stabilising chemicals calculated as ammoniumacetate at least comes up to 0.2 per cent by weight of the treation solution.
  • Tests have shown the following in practice usuable minimum and maximum limits for the content of the ammonium salt calculated as ammonium acetate at different concentrations of nitrite calculated as sodiumnitrite.
  • the preservative according to the invention can in many cases with advantage contain a quaternary ammonium compound, for instance in an amount of 15-25 per cent by weight calculated on the copperions.
  • the quaternary ammoniumcompounds have a wide biocidal effect and therefore it will support the effect of the copper and the zinc and will especially be effective against the copper tolerant fungies.
  • the addition of quaternary ammonium compounds is especially relevant when treating wood-products for use in environments where the copper tolerant fungies exist.
  • the addition of a quaternary ammoniumcompound make it possible to use less amount of preservative than else would be necessary. This is an advantage from an environmental as well as an economic point of view.
  • suitable quaternary ammonium compounds can be mentioned di-coco-di-methyl-ammonium chloride and coco-trimethyl-ammonium chloride.
  • Boric acid can profitably enter the preservative according to the invention.
  • the boric acid can assist the fixation of the copper - and the zinc ions. Besides it contributes to protection of the wood against mould, copper tolerant fungies and insects, including termittes.
  • the preservative can contain further conventional admixture - and/or aid chemicals.
  • chemicals for inhibition of corrosion and for stabilizing plus further fungicides and insecticides, dies, pigments and trace chemicals.
  • the timber after treatment has a greenish colour. Further this colouring can serve as a security that the active ingredients in the preservative have totally penetrated the wood.
  • the product can be recognized as a product with a reliable and effective treatment.
  • wood for use as claddings, as carports, fencings etc. it is of importance, that the greenish colour can be achived. It is an advantage, too, that you can practically have the same colour when mixing wood producs from the new chromiumfree treating with older chromium coloured products.
  • the amount of dye in the treating solution will typical be around 0.1 per thousand.
  • the application of the preservative according to the invention can be done in the well-known ways, for instance coating, spraying, immersion, double vacuum, double vacuum-pressure or pressure processes as “Lowry” (empty- cell), “Bethel” (fullcell) and “Reuping”.
  • immersion and pressure processes especially “Lowry” and “Bethel” are preferred.
  • the concentration of the copper salt in the treating solution can vary depending on the process and the use of the timber but generally the treating solution contains 0.2 - 5 per cent by weight of copper calculated as copperacetate.
  • the content of nitrite calculated as sodium nitrite in the treating solution comes to at least 0.15 per cent by weight as mentioned above and is generally kept on 0.2-1.3 per cent by weight preferably 0.2-1.0 per cent by weight and mainly preferred is 0.26-0.70 per cent by weight.
  • the preservative according to the invention can be used in a variety of other biodegradable organic materials, for instance textiles, ropes, racks, papers and boards plus bather, in which cases it must be applicated by means of known methods far treating of such materials.
  • the preservative according to the invention is effective regarding both to prevent growth of wood-destroying fungies as well as to remain in the wood.
  • the addition of nitrite reduces essentially the leaching of the copper and the zinc from the wood.
  • a preservative with the following composition was prepared:
  • the preservative was dissolved in water to a concentration of 2.2-2.5 per cent by weight and can be classed with the Nordic class A (Danish Standard DS 2122).
  • the treating solution had a pH-value of 5.8 Example 2
  • a preservative with the following composition was prepared:
  • the preservative was dissolve to a concentration of 1.5-1.7 per cent by weight and can be classed with the Nordic class AB (Danish Standard DS 2122).
  • the treating solution had a pH-value of 5.9.
  • a preservative with the following composition was prepared:
  • the preservative was dissolved in water to a concentration of 3.5 per cent by weight and is well qualified for use in territory with probability for attack from termites.
  • the treating solution had a pH-value of 6.0.
  • a preservative with the following composition was prepared:
  • the preservative was dissolved in water to a concentration of 2.7 per cent by weight and can be classed with the DIN-Norm class 4.
  • the treating solution had a pH-value of 5.9.
  • a preservative with the following composition was prepared:
  • the preservative was dissolved to a concentration of 1.8 per cent by weight and can be classed with the DIN-NORM Class 3.
  • the treating solution had a pH-value of 6.1.
  • the treating solution for class A is prepared when you dissolve in 4800 ltr. of water 3 units of packing A and then add 3 units of packing C.
  • the treating solution for class AB is prepared when you dissolve in 4850 ltr. of water 2 units of packing AB and then add 2 units of packing C.
  • a preservative with the following composition was prepared:
  • the preservative was dissolved in water to a concentration of 2.1-2.6 per cent by weight and can be classed with the Nordic class A according to DS 2122 for wood in ground contact.
  • the treating solution had a pH-value of 5.9.
  • the preservative was dissolved to a concentration of 1.5-1.7 per cent by weight and can be clased to class AB according to DS 2122 for wood out of ground contact.
  • the treating solution had a pH-value of 6.0.
  • a preservative with the following composition was prepared:
  • the preservative was dissolved to a concentration of 3.2 per cent by weight and is well qualified for treating of timber for use in territory with probability for attack from termites.
  • the treating solution had a pH-value of 5.9.
  • Example 10 A preservative with the following composition was prepared:
  • the preservative was dissolved in water to a concentration of 2.2 per cent by weight and can be classed to class 4 in the DIN-norm for treated wood in ground contact.
  • the treating solution had a pH-value of 5.9.
  • a preservative with the following composition was prepared:
  • the preservative was dissolved to a concentration of at least 1.5 per cent by weight and can be classed to class 3 in the DIN-norm for treated wood for use out of ground contact.
  • the treating solution had a pH-value of 6.0.
  • the treating solution for class AB was prepared when you dis solve in 4700 ltr. of water 5 units of packing A and then add 5 units of packing C.
  • the treating solution for class AB was prepared when you dissolve in 4800 ltr. of water 3 units of packing AB and then add 3 units of packing C.
  • a preservative with the following composition was prepared:
  • the preservative was dissolved in water to a concentration of 2.7-3.1 per cent by weight and can be classed to class A (DS 2122).
  • the treating solution had a pH-value of 6.0.
  • a preservative with the following composition was prepared:
  • the preservative was dissolved to a concentration of 1.7-1.8 per cent by weight and can be classed to class AB (DS 2122).
  • the treating solution had a pH-value of 6.1
  • Example 15 A preservative with the following composition was prepared:
  • the preservative was dissolved in water to a concentration of 3.3 per cent by weight and can be classed to class 4 in the DIN-norm.
  • the treating solution had a pH-value of 6.1.
  • Example 16 A preservative with the following composition was prepared:
  • the preservative was dissolved in water to a concentration of 1.9 per cent by weight and can be classed to class 3 in the DIN-norm.
  • the treating solution had a pH-value of 6.1.
  • Example 17 For use in class A and class AB in Scandinavia the following 3 packing units was prepared:
  • the treating solution for class A was prepared when you dissolve in 4700 ltr. of water 5 units of packing A and then add 5 units of packing C.
  • the treating solution for class AB was prepared when you dissolve in 4800 ltr. of water 3 units of packing AB and then add 3 units of packing C.
  • Example 18 The present example indicates the leaching tests for determination of the degree of leaching of the zinc- and the copperions from wood treated with different preservatives according to the invention with varied content of sodium nitrite at pH 5.8-6.1.
  • the tests was carried out on Scotch Pine (Pinus Silvestris), treated according to the full-cell process. After fixation the degree of leaching was determined be immersion in distilled water for 72 hours. To ensure totally immersion of the wood samples, the air in the wood was disappeared in vacuum before immersion.
  • the fixation in the following table 1, expressed as per cent is determined from an analyse of the copper- and zinc content in the wood samples before the immersion and an analyse of the copper- and zinc content in the water extract. You will find the results from the present test in the following table 1:
  • Example 19 The present example illustrates a test to determinate the generation of gas from a multitude of different treating solutions according to the invention.
  • the determination was carried out on solutions in a closed system at a temperature of minimum 18° C for at least 3 mounths by measuring a possible increase in pressure.
  • the concentration of copper- and zincacetate was totally 1.72-1.92 % and the concentration of boric acid was 0.22 %.
  • Example 20 The present example illustrates a test to determinate the generation of gas from 2 treating solutions according to the invention.
  • the solution was prepared in that way that the sodium nitrite was dissolved alone as a 10 % solution.
  • the remaining components were dissolved in the remaining water and at least the 2 solutions were mixed.
  • the treating solutions were kept at 18-20° C.
  • the solutions had the following compositions:

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  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Plant Pathology (AREA)
  • Agronomy & Crop Science (AREA)
  • Pest Control & Pesticides (AREA)
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  • Inorganic Chemistry (AREA)
  • Forests & Forestry (AREA)
  • Toxicology (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

Agent de préservation pour le traitement du bois, des produits à base de bois ou des produits de fibre organique analogues. Cet agent renferme un ou plusieurs sels de cuivre et, éventuellement, des sels de zinc d'acides organiques faibles, une substance chimique de stabilisation choisie entre le sel d'ammonium et un sel métallique alcalin d'acide organique faible, un nitrite et, éventuellement, un autre adjuvant - et/ou des substances chimiques auxiliaires. L'agent préservateur contient de 0,1 à 1,0 partie en poids de nitrite, calculé sur la base du nitrite de sodium, pour 1,0 partie en poids de sel de cuivre et, éventuellement, de sel de zinc, calculé sur la base de l'acétate de cuivre. La solution présente une valeur de pH de 5,2 à 6,2 et contient au moins de 0,2 % en poids d'ammonium et de sel métallique alcalin d'acides organiques faibles. Cet agent de préservation assure une bonne fixation du cuivre et s'oppose à son lessivage.
PCT/DK1995/000140 1994-04-07 1995-03-29 Agent preservateur pour le bois, solutions de traitement et utilisation de cet agent WO1995027600A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU23034/95A AU2303495A (en) 1994-04-07 1995-03-29 Preservative for wood, treating solutions and use of the preservative

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK39694A DK170980B1 (da) 1994-04-07 1994-04-07 Træimprægneringsmiddel, brugsklar imprægneringsopløsning og anvendelse af midlet
DK0396/94 1994-04-07

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WO1995027600A1 true WO1995027600A1 (fr) 1995-10-19

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DK (1) DK170980B1 (fr)
WO (1) WO1995027600A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002060661A2 (fr) * 2001-01-30 2002-08-08 U.S. Borax Inc. Concentre de produit de preservation du bois
SG171470A1 (en) * 2003-04-09 2011-06-29 Osmose Inc Micronized wood preservative formulations
US8871277B2 (en) 2003-06-17 2014-10-28 Osmose, Inc. Particulate wood preservative and method for producing the same
US9314030B2 (en) 2004-05-17 2016-04-19 Koppers Performance Chemicals Inc. Particulate wood preservative and method for producing same
US9327423B2 (en) 2014-01-07 2016-05-03 Liquid Lignin Company, Llc Wood preservatives and methods for treating wood
US9775350B2 (en) 2004-10-14 2017-10-03 Koppers Performance Chemicals Inc. Micronized wood preservative formulations in organic carriers
WO2023019028A1 (fr) * 2021-08-13 2023-02-16 Onyx Lotus, Llc Composition de sels multimétalliques en tant que désinfectants

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4857323A (en) * 1986-02-27 1989-08-15 Hager Bror O Preservative for wood
WO1991011306A1 (fr) * 1990-02-02 1991-08-08 Hickson International Plc Agents conservateurs et procede de traitement du bois a l'aide de ces agents

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4857323A (en) * 1986-02-27 1989-08-15 Hager Bror O Preservative for wood
WO1991011306A1 (fr) * 1990-02-02 1991-08-08 Hickson International Plc Agents conservateurs et procede de traitement du bois a l'aide de ces agents

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002060661A2 (fr) * 2001-01-30 2002-08-08 U.S. Borax Inc. Concentre de produit de preservation du bois
WO2002060661A3 (fr) * 2001-01-30 2003-01-03 United States Borax Inc Concentre de produit de preservation du bois
US6896908B2 (en) 2001-01-30 2005-05-24 U.S. Borax Inc. Wood preservative concentrate
SG171470A1 (en) * 2003-04-09 2011-06-29 Osmose Inc Micronized wood preservative formulations
US9079328B2 (en) 2003-04-09 2015-07-14 Koppers Performance Chemicals Inc. Micronized wood preservative formulations
US8871277B2 (en) 2003-06-17 2014-10-28 Osmose, Inc. Particulate wood preservative and method for producing the same
US9314030B2 (en) 2004-05-17 2016-04-19 Koppers Performance Chemicals Inc. Particulate wood preservative and method for producing same
US9775350B2 (en) 2004-10-14 2017-10-03 Koppers Performance Chemicals Inc. Micronized wood preservative formulations in organic carriers
US9327423B2 (en) 2014-01-07 2016-05-03 Liquid Lignin Company, Llc Wood preservatives and methods for treating wood
WO2023019028A1 (fr) * 2021-08-13 2023-02-16 Onyx Lotus, Llc Composition de sels multimétalliques en tant que désinfectants

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DK39694A (da) 1995-10-08
AU2303495A (en) 1995-10-30
DK170980B1 (da) 1996-04-09

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