GB2471858A - Method for forming a shaped body for use in timber preservation - Google Patents

Method for forming a shaped body for use in timber preservation Download PDF

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Publication number
GB2471858A
GB2471858A GB0912234A GB0912234A GB2471858A GB 2471858 A GB2471858 A GB 2471858A GB 0912234 A GB0912234 A GB 0912234A GB 0912234 A GB0912234 A GB 0912234A GB 2471858 A GB2471858 A GB 2471858A
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GB
United Kingdom
Prior art keywords
shaped body
boron compound
forming
calcium
calcium sulphate
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.)
Granted
Application number
GB0912234A
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GB2471858B (en
GB0912234D0 (en
Inventor
John Young
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.)
CHEMTECH DEV Pty Ltd
Original Assignee
CHEMTECH DEV Pty 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
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Priority to GB0912234A priority Critical patent/GB2471858B/en
Publication of GB0912234D0 publication Critical patent/GB0912234D0/en
Publication of GB2471858A publication Critical patent/GB2471858A/en
Application granted granted Critical
Publication of GB2471858B publication Critical patent/GB2471858B/en
Expired - Fee Related legal-status Critical Current
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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
    • B27K3/16—Inorganic impregnating agents
    • B27K3/163—Compounds of boron
    • 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
    • A01N25/34—Shaped forms, e.g. sheets, not provided for in any other sub-group of this main group
    • 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
    • A01N59/14—Boron; Compounds thereof
    • 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
    • B27K3/02—Processes; Apparatus
    • 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
    • B27K3/02—Processes; Apparatus
    • B27K3/0257—Processes; Apparatus using rods or tablets, or ampoules, e.g. inserted in pre-drilled cavities
    • 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
    • B27K3/32—Mixtures of different inorganic impregnating agents

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Forests & Forestry (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • Plant Pathology (AREA)
  • Pest Control & Pesticides (AREA)
  • Agronomy & Crop Science (AREA)
  • Zoology (AREA)
  • Environmental Sciences (AREA)
  • Toxicology (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Detergent Compositions (AREA)
  • Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Abstract

A method for forming a shaped body containing at least one boron compound, includes the step of grinding the at least one boron compound to a particle size of between 100 and 250 mesh. A structuring agent is added at a rate of between 8 and 15% by weight of the resultant composition, which is thoroughly mixed, deposited into one or more moulds, and pressurised at between 180 and 200 kg/cm2at room temperature for up to 2 minutes. The boron compound may be selected from disodium octoborate tetrahydrate, disodium tetraborate decahydrate, disodium tetraborate pentahydrate, sodium metaborate tetrahydrate, boric acid or zinc borate. The structuring agent may be selected from calcium sulphate, calcium hemisulphate, calcium sulphate dehydrate or calcium carbonate. One or more fluoride containing compounds may be included. A method of treatment of a timber pole may comprise inserting shaped bodies formed according to the above method into holes extending above and below ground, and then sealing the holes.

Description

PROCESS FOR PREPARING A SHAPED BODY
FIELD OF THE INVENTION
This invention relates to the production of shaped bodies including shaped bodies of boron compounds having a timber preservative effect.
BACKGROUND OF THE INVENTION
Structural timber items such as poles and frames require protection from decay or rotting due to exposure to moisture. One method of achieving this is to insert into the timber solid bodies containing decay preventing or inhibiting formulations.
For example United Kingdom Patent Specification No. 2,008,640 A discloses the treatment of timber by the insertion into a cavity in the timber of a shaped fused body of boric oxide. The body dissolves over an extended period in the moisture present in the timber to form a solution which is toxic to organisms responsible for the decay of timber. The body is made by the extrusion of boric oxide in the molten state or by the moulding and compacting of particulate boric oxide followed by fusing into monolithic structures. Whilst boric oxide glass softens at a temperature of about 325°C, melt extrusion temperatures considerably in excess of this are required to form the bodies. This causes practical processing problems, including high energy requirements.
United Kingdom Patent Specification No. 2,114,003 discloses the treatment of, inter alia, timber structures by locating in the cavity of the structure a tablet comprising a mixture of particulate boron compounds, selected from at least two of the three groups comprised by the borates, boric acids and boric oxides, together with a binder, with the tablet being shaped by compaction under pressure.
US Patent No. 4,661,157 discloses a process for the production of the shaped bodies of boron compounds, which requires neither high temperatures nor high *S* * : * pressures and which is said to be operable continuously or semi-continuously. The shaped body comprises one or more boron compounds and is characterised by * 30 forming a paste comprising water and the one or more boron compounds, said boron compounds being capable of binding water by hydration, followed by shaping the * , * *: paste into a body, and then allowing the paste to solidify by the binding of at least a * portion of the water in the paste to form the shaped body, preferably a rod. However, * the hydration rate has to be controlled carefully. If the hydration and shaping is effected too quickly the resulting body may be unacceptably low in density and strength. The process requires hydratable boron compounds. This restricts the range of boron compounds which are suitable.
Australian Patent No. 636079 discloses the addition of sodium fluoride, which is itself a biocide able to control wood decay. The low solubility of sodium fluoride in water can have the effect of extending the period of protection.
Additionally, the presence of sodium fluoride can affect the rate of hydration of the boron compounds, leading to a slower and lengthier shaped body formation process resulting in stronger and denser rods. The addition of sodium fluoride to improve the hydration rate may result in higher density and higher strength rods which, however, are toxic and possibly have lower overall active effectiveness as a fungus and termite control agent.
It is an object of the present invention to ameliorate the aforesaid disadvantages and provide a method for producing shaped bodies containing boron compounds, said shaped bodies being capable of acting as timber preservative agents.
SUMMARY OF THE INVENTION
According to one aspect of the invention there is provided a shaped body containing at least one boron compound formed by a high compression process carried out at room ambient temperature.
According to another aspect of the present invention there is provided a method for forming a shaped body containing at least one boron compound, said method including the steps of grinding at least one boron compound to between 100 and 250 mesh, followed by the addition of a structuring agent at a rate of between 8 and 15% by weight of the resulting composition, thoroughly mixing the resultant composition, depositing the resultant mixed composition into one or more moulds, and subsequently applying pressure at between 180 and 200 kg/cm2, preferably 200 kg/cm2' at room ambient temperature to the resulting mixed composition until * : * * satisfactory solidification of the resultant mixed composition has been achieved.
The at least one boron compound preferably is at least one of disodium octoborate tetrahydrate, disodium tetraborate decabydrate, disodium tetraborate S. pentahydrate, sodium metaborate tetrahydrate, boric acid, and zinc borate.
* * The structuring agent preferably is one or more of calcium sulphate, calcium * : * hemisulphate, calcium sulphate dehydrate, and calcium carbonate. Especially preferred is calcium sulphate making up 9% of the resulting composition.
The moulds may be for forming rods having diameters between 10 and 14 mm and lengths between 100 and 140 mm. More preferably, the moulds are for forming rods of 12mm diameter and 125 mm in length.
Preferably, the pressure is applied at room ambient temperature by means of a pushing rod for a period of up to 2 minutes.
Solidification of the shape body follows after the compression is completed and optimum strength of the shaped bodies is achieved after a few minutes.
The method of the present invention can also be used with compositions containing at least one of the boron compounds identified above and other chemicals.
However, it is not necessary to add compounds such as sodium fluoride to achieve stronger and denser shaped bodies. It appears necessary to control particle size and pressure range only to achieve a satisfactory strength and density, as opposed to extrusion processes where the properties of combined chemical compounds must be investigated carefully. Bodies including rods, produced by the method of the present invention advantageously have a high percentage "boron only" composition which provides better fungal and termite control with minimal mammalian toxicity.
However, optionally the shaped bodies may also contain fluoride compounds or any other solid compound insecticide//biocide, as it has been found possible to add such compounds to a certain extent to the composition prior to compression without losing control over or unduly compromising density and strength. The fluoride compounds may be selected from the group comprising sodium bifluoride, sodium fluoride, calcium fluoride, zinc silicofluoride, sodium silicofluoride, magnesium silicofluoride, potassium fluoride, potassium hydrogen fluoride and ammonium hydrogen fluoride. The insecticide/biocide may be selected from the group comprising copper hydroxide, copper sulphate, and potassium dichromate.
To treat a timber structure using the shaped bodies of the present invention abaxial holes are drilled in the timber structure preferably starting above the groundline and extending to below the groundline. *
A number of shaped bodies made according to the method of the present * : * 30 invention, preferably rods, are inserted into each drilled hole and the holes are then **S sealed.
* The moisture in the wood at ground level slowly dissolves the chemicals in * I * the rods and these chemicals are absorbed into the wood to prevent fungal decay and ****I * I termite attack.
PREFERRED EMBODIMENT
In order that the invention may be more clearly understood the following preferred embodiment is described.
Boric acid and disodium tetraborate (borax) are ground separately to a particle size of between 100 and 250 mesh. The ground compounds are mixed in a ratio of approximately 1.5 to 1 boric acid to disodium tetraborate. Calcium sulphate is then added to make up approximately 10% by weight of the resulting mixture. The calcium sulphate acts as a structuring agent. The powder phase mixture is mixed thoroughly and deposited into moulds of approximately 12 mm diameter and 125 mm in length. A pressure of 200 kg/cm2 is applied via a pushing bar for 2 minutes. This results in solidification of the powder into a rod shape which is then ready for packing and use.
In use, the shaped rods are inserted into abaxial holes drilled in a timber structure or pole where such holes extend from above the ground line to below the ground line. One or a plurality of rods are inserted into each drilled hole. The holes are then sealed. As a result of moisture in the wood or timber at ground level the chemicals in the rods slowly dissolve and migrate throughout the timber to prevent fungal decay and termite attack.
It is to be understood that the invention may embrace many further modifications as would be readily apparent to persons skilled in the art and which would be deemed to reside within the broad scope and ambit of the invention. The preferred embodiment described above is by way of example only and is not to be considered as limiting.
Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.
* The reference to any prior art in this specification is not, and should not be * 30 taken as, an acknowledgment or any form or suggestion that the prior art forms part of the common general knowledge. I*** * . *
*.S...
S S

Claims (8)

  1. CLAIMS1. A method for forming a shaped body containing at least one boron compound, said method including the steps of grinding at least one boron compound to a particle size of between 100 and 250 mesh, followed by the addition of a structuring agent at a rate of between 8 and 15% by weight of the resulting composition, thoroughly mixing the resultant composition, depositing the resultant mixed composition into one or more moulds, and subsequently applying pressure at between 180 and 200 kg/cm2 at room temperature for up to 2 minutes.
  2. 2. A method for forming a shaped body as claimed in Claim 1, wherein said at least one boron compound is selected from the group comprising disodium octoborate tetrahydrate, disodium tetraborate decahydrate, disodium tetraborate pentahydrate, sodium metaborate tetrabydrate, boric acid and zinc borate.
  3. 3. A method for forming a shaped body as claimed in either Claim 1 or Claim 2 wherein the structuring agent is selected from one or more of calcium sulphate, calcium hemisuiphate, calcium sulphate dehydrate, and calcium carbonate.
  4. 4. A method of forming a shaped body as claimed in Claim 3 wherein the structuring agent is calcium sulphate
  5. 5. A method of forming a shaped body as claimed in Claim 4 wherein said calcium sulphate makes up 9% of the said resulting composition.
  6. 6. A method of forming a shaped body as claimed in Claim 1 wherein said pressure is 200 kg/cm2.
  7. 7. A shaped body containing at least one boron compound, formed by the method of grinding the at least one boron compound to a particle size of between and 250 mesh, subsequently adding a structuring agent at a rate of between 8 and 15% by weight of the resulting composition, thoroughly mixing the resultant composition, depositing the resultant mixed composition into one or more moulds, and subsequently applying pressure at between 180 and 200 kg/cm2 at room temperature for up to 2 minutes.
  8. 8. A shaped body as claimed in Claim 7 wherein said at least one *.I. *I * 30 boron compound is selected from the group comprising disodium octoborate *.* * tetrahydrate, disodium tetraborate decahydrate, disodium tetraborate pentahydrate, sodium metaborate tetrahydrate, boric acid and zinc borate.S.....S9. A shaped body as claimed in Claim 7 wherein said structuring agent is selected from one or more of calcium sulphate, calcium hemisulphate, calcium sulphate dehydrate, and calcium carbonate.10. A shaped body as claimed in Claim 7 wherein there is present one or more fluoride compounds or another solid compound insecticide/biocide.11. A method of treatment of a timber structure or timber pole partly situated in ground wherein at least one shaped body made according to the method according to any one of claims 1 to 6 is inserted into each of one or more abaxial holes drilled into the timber structure or pole, said abaxial holes extending from above ground level to below ground level, followed by sealing of said abaxial holes.S S..'*SSSSI * S * . *5*. *S *5*SSS..... I *SS.....S
GB0912234A 2009-07-14 2009-07-14 process for preparing a shaped body Expired - Fee Related GB2471858B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0912234A GB2471858B (en) 2009-07-14 2009-07-14 process for preparing a shaped body

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Application Number Priority Date Filing Date Title
GB0912234A GB2471858B (en) 2009-07-14 2009-07-14 process for preparing a shaped body

Publications (3)

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GB0912234D0 GB0912234D0 (en) 2009-08-26
GB2471858A true GB2471858A (en) 2011-01-19
GB2471858B GB2471858B (en) 2013-12-04

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5726669A (en) * 1980-07-22 1982-02-12 Nissan Chem Ind Ltd Chlorinated isocyanuric acid formed product disintegrable in water
JPS5885804A (en) * 1981-11-18 1983-05-23 Nissan Chem Ind Ltd Small tablet for bleach sterilization
GB2114003A (en) * 1982-01-27 1983-08-17 Bio Kil Lab Limited Wood preserving tablet
JPS60237001A (en) * 1984-05-10 1985-11-25 Nissan Chem Ind Ltd Formed composition for water treatment
JPH01128905A (en) * 1987-11-13 1989-05-22 Nissan Chem Ind Ltd Molded composition for water treatment

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5726669A (en) * 1980-07-22 1982-02-12 Nissan Chem Ind Ltd Chlorinated isocyanuric acid formed product disintegrable in water
JPS5885804A (en) * 1981-11-18 1983-05-23 Nissan Chem Ind Ltd Small tablet for bleach sterilization
GB2114003A (en) * 1982-01-27 1983-08-17 Bio Kil Lab Limited Wood preserving tablet
JPS60237001A (en) * 1984-05-10 1985-11-25 Nissan Chem Ind Ltd Formed composition for water treatment
JPH01128905A (en) * 1987-11-13 1989-05-22 Nissan Chem Ind Ltd Molded composition for water treatment

Also Published As

Publication number Publication date
GB2471858B (en) 2013-12-04
GB0912234D0 (en) 2009-08-26

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20160714