IE86225B1 - Process for preparing a shaped body - Google Patents
Process for preparing a shaped body Download PDFInfo
- Publication number
- IE86225B1 IE86225B1 IE20090588A IE20090588A IE86225B1 IE 86225 B1 IE86225 B1 IE 86225B1 IE 20090588 A IE20090588 A IE 20090588A IE 20090588 A IE20090588 A IE 20090588A IE 86225 B1 IE86225 B1 IE 86225B1
- Authority
- IE
- Ireland
- Prior art keywords
- shaped body
- calcium
- boron compound
- forming
- composition
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title description 5
- 150000001639 boron compounds Chemical group 0.000 claims abstract description 23
- 239000000203 mixture Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 22
- 239000002245 particle Substances 0.000 claims abstract description 5
- 238000000151 deposition Methods 0.000 claims abstract description 4
- 238000000227 grinding Methods 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims abstract description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 20
- 239000001175 calcium sulphate Substances 0.000 claims description 10
- 235000011132 calcium sulphate Nutrition 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 6
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 5
- 239000004327 boric acid Substances 0.000 claims description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 4
- 230000003115 biocidal effect Effects 0.000 claims description 4
- 239000003139 biocide Substances 0.000 claims description 4
- 239000011575 calcium Substances 0.000 claims description 4
- 229910052791 calcium Inorganic materials 0.000 claims description 4
- QXNVGIXVLWOKEQ-UHFFFAOYSA-N Disodium Chemical compound [Na][Na] QXNVGIXVLWOKEQ-UHFFFAOYSA-N 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- YNPKJCSIKJCODK-UHFFFAOYSA-N disodium boric acid hydrogen borate decahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].OB(O)O.OB(O)O.OB(O)O.OB([O-])[O-] YNPKJCSIKJCODK-UHFFFAOYSA-N 0.000 claims description 3
- RSCACTKJFSTWPV-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane;pentahydrate Chemical compound O.O.O.O.O.[Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 RSCACTKJFSTWPV-UHFFFAOYSA-N 0.000 claims description 3
- 150000002222 fluorine compounds Chemical class 0.000 claims description 3
- 239000002917 insecticide Substances 0.000 claims description 3
- JAKYJVJWXKRTSJ-UHFFFAOYSA-N sodium;oxido(oxo)borane;tetrahydrate Chemical compound O.O.O.O.[Na+].[O-]B=O JAKYJVJWXKRTSJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 150000004685 tetrahydrates Chemical class 0.000 claims description 3
- BIKXLKXABVUSMH-UHFFFAOYSA-N trizinc;diborate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]B([O-])[O-].[O-]B([O-])[O-] BIKXLKXABVUSMH-UHFFFAOYSA-N 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims 1
- 238000007789 sealing Methods 0.000 claims 1
- 229910021653 sulphate ion Inorganic materials 0.000 claims 1
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 description 12
- 239000011775 sodium fluoride Substances 0.000 description 6
- 235000013024 sodium fluoride Nutrition 0.000 description 6
- 230000036571 hydration Effects 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 5
- 229910011255 B2O3 Inorganic materials 0.000 description 4
- 241000256602 Isoptera Species 0.000 description 4
- 235000010338 boric acid Nutrition 0.000 description 4
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910021538 borax Inorganic materials 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 230000002538 fungal effect Effects 0.000 description 3
- 235000010339 sodium tetraborate Nutrition 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- AJFXNBUVIBKWBT-UHFFFAOYSA-N disodium;boric acid;hydrogen borate Chemical compound [Na+].[Na+].OB(O)O.OB(O)O.OB(O)O.OB([O-])[O-] AJFXNBUVIBKWBT-UHFFFAOYSA-N 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000011864 timber preservative Substances 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- ASZZHBXPMOVHCU-UHFFFAOYSA-N 3,9-diazaspiro[5.5]undecane-2,4-dione Chemical compound C1C(=O)NC(=O)CC11CCNCC1 ASZZHBXPMOVHCU-UHFFFAOYSA-N 0.000 description 1
- IBZGBXXTIGCACK-UHFFFAOYSA-N 6,7,9,11-tetrahydroxy-9-(2-hydroxyacetyl)-4-methoxy-8,10-dihydro-7h-tetracene-5,12-dione Chemical compound C1C(O)(C(=O)CO)CC(O)C2=C1C(O)=C1C(=O)C(C=CC=C3OC)=C3C(=O)C1=C2O IBZGBXXTIGCACK-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- JJLJMEJHUUYSSY-UHFFFAOYSA-L Copper hydroxide Chemical compound [OH-].[OH-].[Cu+2] JJLJMEJHUUYSSY-UHFFFAOYSA-L 0.000 description 1
- 239000005750 Copper hydroxide Substances 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- 240000008397 Ganoderma lucidum Species 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 241000647402 Xylaria obovata Species 0.000 description 1
- LDDQLRUQCUTJBB-UHFFFAOYSA-O azanium;hydrofluoride Chemical compound [NH4+].F LDDQLRUQCUTJBB-UHFFFAOYSA-O 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000005619 boric acid group Chemical class 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 150000001642 boronic acid derivatives Chemical class 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 229910001956 copper hydroxide Inorganic materials 0.000 description 1
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 231100001225 mammalian toxicity Toxicity 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000000075 oxide glass Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000011698 potassium fluoride Substances 0.000 description 1
- 235000003270 potassium fluoride Nutrition 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- BFXAWOHHDUIALU-UHFFFAOYSA-M sodium;hydron;difluoride Chemical compound F.[F-].[Na+] BFXAWOHHDUIALU-UHFFFAOYSA-M 0.000 description 1
Landscapes
- Agricultural Chemicals And Associated Chemicals (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
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 percent 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/cm squared at room temperature for up to 2 minutes.
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 10 into the timber solid bodies containing decay preventing or inhibiting formulations.
or 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 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 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
13/07/09,s pec as filed-1,1
-28622^ 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 decahydrate, disodium tetraborate 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.
13/07/09,spec as filed-1,2
-3 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 5 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 invention, preferably rods, are inserted into each drilled hole and the holes are then sealed.
The moisture in the wood at ground level slowly dissolves the chemicals in the rods and these chemicals are absorbed into the wood to-prevent fungal decay and- _ termite attack.
13/07/09,spec as Sled-1,3
-4PREFERRED 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 taken as, an acknowledgment or any form or suggestion that the prior art forms part of the common general knowledge.
13/07/09,spec as filed-1,4
Claims (11)
1. 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 5 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/cm at room temperature for up to 2 minutes.
2. A method for forming a shaped body as claimed in Claim 1, wherein 10 said at least one 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.
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 15 sulphate, calcium hemisulphate, calcium sulphate dehydrate, and calcium carbonate.
4. A method of forming a shaped body as claimed in Claim 3 wherein the structuring agent is calcium sulphate
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. 20
6. A method of forming a shaped body as claimed in Claim 1 wherein said pressure is 200 kg/cm .
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 100 and 250 mesh, subsequently adding a structuring agent at a rate of between 8 and 25 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/cm at room temperature for up to 2 minutes.
8. A shaped body as claimed in Claim 7 wherein said at least one 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. 13/07/09, spec as filed-1,5 -69. 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.
9. 10. A shaped body as claimed in Claim 7 wherein there is present one or 5 more fluoride compounds or another solid compound insecticide/biocide.
10.
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 10 ground level to below ground level, followed by sealing of said abaxial holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IE20090588A IE86225B1 (en) | 2009-07-14 | 2009-07-14 | Process for preparing a shaped body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IE20090588A IE86225B1 (en) | 2009-07-14 | 2009-07-14 | Process for preparing a shaped body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IE20090588A1 IE20090588A1 (en) | 2013-02-27 |
| IE86225B1 true IE86225B1 (en) | 2013-07-17 |
Family
ID=47739794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IE20090588A IE86225B1 (en) | 2009-07-14 | 2009-07-14 | Process for preparing a shaped body |
Country Status (1)
| Country | Link |
|---|---|
| IE (1) | IE86225B1 (en) |
-
2009
- 2009-07-14 IE IE20090588A patent/IE86225B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| IE20090588A1 (en) | 2013-02-27 |
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| MM4A | Patent lapsed |